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# Induction Motor - Science topic

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I want to prepare data sets to train neural network to estimate 3 phase induction motor speed. I am using Denfoss make FC-302 AC drive to run 3 HP IM at different speed. I can export rms value of AC drive terminal voltage and phase current ,power,torque. etc to excel sheet.
From excel data (RMS voltage and current) i can implement abc-Alpha beta transformation in simulink. This alpha beta componentes of voltage and current can be used to obtain rotor flux . But i am feeling i am missing the phase relation when recording RMS voltages and currents.This may result in incorrect rotor flux value.
And also i am unable find Induction motor resistance ,mutual inductance and leakage inductance value in technical specification provided by the manufacturers.
Savitha Pr Follow these procedures to obtain data sets for training a neural network for sensorless speed estimate of an induction motor:
1. Create a test rig: Connect the induction motor and the AC drive as directed by the manufacturer.
2. Run the motor at various speeds: Record the RMS values of the AC drive terminal voltage and phase current, power, and torque while you run the motor at different speeds.
3. Carry out the ABC-Alpha Beta transformation: To conduct the ABC-Alpha Beta transformation in Simulink, use the exported RMS values of the AC drive terminal voltage and phase current.
4. Determine the rotor flux: Calculate the rotor flux using the alpha-beta components of voltage and current.
5. Keep track of the motor speed: Measure and record the motor speed on each run.
6. Repeat the above steps many times: Repeat the preceding procedures to expand the size of your data collection.
7. Preparing the data: Remove any noise, outliers, and discrepancies from the data.
8. Divide the data into two sets: training and validation: Divide the data into training and validation sets for use in training and assessing the neural network's performance.
If you are unable to determine the induction motor resistance, mutual inductance, and leakage inductance values, you may need to utilize additional approaches such as finite element analysis or physical testing.
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The following two blocks cannot be connected in series:
Block 1: 'A_stator: Asynchronous Machine pu Units'
Block 2: 'phase_A: Three-Phase Series RLC Load'
The first block, modeled as a current source, cannot be connected in series with the inductive element of the second block.
Add a high-value resistance in parallel with one of the two block.
Add a very high resistor (say 1e12 ohm) in parallel with load.
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We are designing 3 phase squirrel cage induction motor for EV,
Our main aim is to get high efficiency, power factor,and breakdown torque...
How can I design by satisfying these three parameters...
What should I change /focus mainly in designing. ..?
Ok sir thank you,,,,
My main aim is to get 90% efficiency and ,high torque and high power factor..... for squirrel cage induction motor....
I am using Ansys maxwell Rmxprt software is it sufficient to design?
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What happen If rotor of induction have only rotor bars and without laminated iron core ?
If rotor of induction have only rotor bars and without laminated iron core, the generated flux in the rotor will be very low.
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It's common sense that the insulation of stator deteriorate when water enters in induciton motor. I want to know a more detailed process of the failure evolution. What's the main outcome when water enters in induction motor? Is it inter-turn short circuit, phase to phase circuit or short circuit to ground? Or is there an order of these faults?
you may want to check this link
Induction Motor Stator Interturn Short Circuit Fault Detection in Accordance with Line Current Sequence Components Using Artificial Neural Network (hindawi.com)
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Uncertainties and external disturbances such as load disturbance in controlling the speed of induction motor are the main factors for design controller.
1) Fuzzy logic is a Nonlinear system but PID is a liner system so the performance of fuzzy is better than PID
2)In an uncertainty system, nonlinear control is better than linear control
3)The output of the fuzzy logic controller can be controlled because of the fuzzy set
4)It is well known that fuzzy is more complex compared to PID and more computational but nowadays no issues with complexity. There are advanced microprocessor controllers such as DSpace 1104 and 1103. These controllers are fast with a large capacity of memory so no issues with computational of fuzzy. That is why simplified rules of fuzzy logic controllers are designed to reduce the computational burden of the fuzzy logic controller and the complexity of the system.
I would like to share this one with you guys for discussion :
advantages of the fuzzy logic controller over the PID controller
1) Fuzzy logic is a Nonlinear system but PID is a liner system so the performance of fuzzy is better than PID
2)In an uncertainty system, nonlinear control is better than linear control 3)The output of the fuzzy logic controller can be controlled because of the fuzzy set
4)It is well known that fuzzy is more complex compared to PID and more computational but nowadays no issues with complexity. There are advanced microprocessor controllers such as DSpace 1104 and 1103. These controllers are fast with a large capacity of memory so no issues with computational of fuzzy. That is why simplified rules of fuzzy logic controllers are designed to reduce the computational burden of the fuzzy logic controller and the complexity of the system.
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Hello
please i need help , i am trying to control an induction motor by the torque via the field-oriented method , however i couldnt be able to do it , if you have any ideas please im stuck
Dear Mohamed,
Bravo for your interest on this topic. I simply recommend you explore your analysis on this subject by taking diligent cursory look on the following:
1. What is torque
2. Field oriented machine
3. Investigate how the above 2 parameters apply & effect on the performance of induction motors.
Do above implicitly, and I assure you that you shall shortly surmount your mountain.
I'm available to work with you further on this. Reach me on olalowo@yahoo.co.uk when you are intrinsically sure you've done your research.
Best Regards,
Engr. Dr. Olalowo Samuel OLALEYE
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I'm doing research on FDD of induction motor. I want to know if there are datasets of faulty induction motor(normal, inter-turn circuit and broken rotor bras) recording stator phase voltage, current and rotation speed with different supply voltage frequency. It would be better if the electrical parameters(Rs, Rr, Lls, Llr, Lm) are given.
Hi,
Here you have few papers with some of the datasets you are looking for. Sure, as papers, it is not giving the full sets of all the measurement and data, but you could find probably some interesting information.
- H. Henao, C. Demian, and G.-A. Capolino, “A frequency-domain
detection of stator winding faults in induction machines using an
external flux sensor,” IEEE Transactions on Industry Applications,
vol. 39, no. 5, pp. 1272–1279, 2003.
- J. de Pelegrin, U. J. Dreyer, J. P. Bazzo, and J. C. C. da Silva, “Faults
diagnosis in induction motors through thermal mapping produced by
the rdts system,” IEEE Sensors Journal, vol. 21, no. 18, pp. 20 061–
20 068, 2021.
- A. C. Muxiri, F. Bento, D. Fonseca, and A. J. M. Cardoso, “Thermal
analysis of an induction motor subjected to inter-turn short-circuit failures
in the stator windings,” in International Conference on Industrial
Engineering, Applications and Manufacturing (ICIEAM). IEEE, 2019,
pp. 1–5.
- J. Zhao, X. Guan, C. Li, Q. Mou, and Z. Chen, “Comprehensive
evaluation of inter-turn short circuit faults in pmsm used for electric
vehicles,” IEEE Transactions on Intelligent Transportation Systems,
vol. 22, no. 1, pp. 611–621, 2020.
Best regards
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We know that there's T equivalent circuit and inverse Γ-equivalent circuit for 3 phase induction motor(IM). When the IM is operating under normal situation, the windings are symmetrical, so all 3 phases equivalent circuit should be the same, but when a fault occur to it—e.g., inter turn short circuit(ITSC) of phase A, the windings become asymmetrical. Is it okay to use equivalent circuit to reprensent each winding? Which means, same structure of equivalent circuit while the value of the parameters are different.
If it's okay, what should the input voltage to the equivalent circuit is? phase to phase voltage or phase to neutral point voltage?
Amr Refky Abd Elwhab Thank you for the detailed elaboration. I might not express my self clealy. What I want to say is to represent each phase with their own equivalent circuit—i.e., per phase equivalent circuit A with A parameters to represent phase A, per phase equivalent circuit B with B parameters to represent phase B, per phase equivalent circuit C with C parameters to represent phase C. The input voltage is the corresponding stator phase voltage. That's like with one phase staor voltage and current, we can determine this phase corresponding parameters. Actually I verify the validity of this when the motor is under normal situation, but it doesn't perform well when it's under fault state—i.e, ITSC fault.
That's way I want to ask if it's okay to use equivalent circuit under asymmetric winding(one equivalent circuit for one phase with their own unique parameters).
After these day's research I had a conclusion but I'm not so sure. We can use equivalent circuit under asymmetric windings, but the input voltage should be the dostorted voltage under the configuration of 3 wires without neutral line, if it's 4 wires, the stator phase voltage is the same as supply voltage, which is what I use in simulation, and this might be the issue.
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I want to measure the stator phase voltage of induction motor——i.e.,the voltage between phase terminal and common point of stator winding. It's easy to do this when the motor is healthy since it equals to supply voltage, but when the windings are asymmetric, like ITSC fault occuring to the motor, the relation fails. I wonder if there is a way to measure stator phase volatge in self built ITSC fault induction machine model in matlab Simulink? Or there's other simulation productis which can make it?
Mohamed-Mourad Lafifi Thanks, it's a detailed induction motor modeling paer, but it does't cover the phase voltage measuring. The input voltage in the paper won't be affected by winding asymmetry.
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I want to run a simulation using the Simplified Induction Motor block in Simulink, the block ports are physical ports, so I used the PS-Simulink Convert and Display to see the simulation results, but the Simulink showed me an error of the configuration model. I attached an image of the configuration model.
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I'm recently making research on induction motor parameter identification and found a research matching my purpose, but I don't know how to build this "ABCabc model of an induction motor", which is the key to get the caculated current. Does anyone know this model of induction motor?
I attached the picture mentioning this phrase and the full text as well. It's from Dr. Ahmed M.Alturas.
One more thing worth mentioning is that Dr. Alturas proposed the method to get the electrical parameters of the induction motor under steady state without the need of prior knowledge. I tried to implement his algorithms but failed. I've tried the transfer funciton model and electric circuit model of induction motor under steady state, but the parameters didn't converge. I feel like the model is the key. Once this ABCabc model is used, it'll converge.
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Hello guys,
I am doing a research on speed control of induction machine using chattering free sliding mode controller. The controller is working very well when a constant speed is given as a reference. But when the reference/setpoint is changed to variable reference speed, the controller is unable control the speed after the first sampling time. If you have any idea about it, can you help me? please.
Most likely something is not correct regarding the compensation (feedforward terms) for the reference command
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I have seen that almost all four-wheeler commercial vehicles or power requirements over 10 kW, PMSM or Induction motors are used. Is the reason behind this is more torque ripple and lower speed range of BLDC motors? What are the other reasons?
But if I want to use a BLDC motor for a power requirement of around 40 kW in an EV, considering better power density, what are the disadvantages that can be faced. What are the other advantages of BLDC that can support its application in this case?
Is there any commercial EV that is using a BLDC motor for the power requirement range of 30-50 kW?
It might be noted that a BLDC is basically a PMSM just designed for trapezoidal back-emf which can be nicely used for low-cost, position-sensorless control, e.g., using hall effect sensors for generating switching pulses. In this regard, the difference between BLDC and PMSM is only minor and given the same amount of design effort their power and torque density can be pushed to nearly the same level. Against this background, the terminology ‘brushless DC motor’ is also largely incorrect from my personal perspective, since its current, voltage and flux waveforms are everything but DC – it is just a special three-phase AC motor variant.
However, another main difference is typically on the control and sensor level. Automotive PMSM drives typically incorporates positions and current sensors together with sophisticated control and functional safety to ensure proper drive function. These features are typically not part of a BLDC drive, however, there is not technical issue to integrate them.
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Hello! Kindly guide from where I can get datasets for Induction Motor Rotor Bar fault detection? Specifically does any one have access to data from LAII Laboratory of University of Poitiers (France)? It is not accessible through the link http://laii.univ-poitiers.fr/ given in the paper: Mario E. and Ali C. (2005). BROKEN BAR DETECTION IN INDUCTION MOTORS - Using non intrusive torque estimation techniques. In Proceedings of the Second International Conference on Informatics in Control, Automation and Robotics - Robotics and Automation, pages 144-149, DOI: 10.5220/0001156901440149
Hi, sir, did you find the fault dataset?
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I want to know what is the current research is going on in the field of vector controlled induction motor drive....suggest some useful applications....
Research on classical field-oriented control w.r.t. to linear feedback control is largely finished. Current research focus is on model predictive control (cf. https://www.wiley.com/en-gb/Model+Predictive+Control+of+High+Power+Converters+and+Industrial+Drives-p-9781119010906) and machine learning-based control (e.g., using reinforcement learning cf. https://ieeexplore.ieee.org/abstract/document/9376968). Both can (but not must) be integrated within a field-oriented coordinate system.
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focus on indirect field oriented control
math lab simulation little description
result analysis
Personally, I do not see the point why to use fuzzy control for motor drives at all. Electrical drive systems can be considered to be fully deterministic (except measurement noise) while their dynamics are well understood and easy to model. Hence, there is no fuzziness / stochastic impact within a drive system which would justify fuzzy logic based control actions.
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if possible please send me to mahe.nani64@gmail.com.
thank you
If you want to program it in Matlab, you may have a view in the Matlab Global Optimization Toolbox which actually covers the mentioned optimization algorithms.
You may also find the following papers interesting which actually performed the discussed task on a real-world drive system:
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I have implemented Switching table based direct torque control of three phase induction motor. But now i want to implement virtual space vector based direct torque control and for that purpose i have prepared two switching tables. now in order to form virtual space vector i need to apply two vectors in one switching time . That is for 0.73 Ts (sampling time) we need to apply output of one switching table and for remaining 0.27 Ts(sampling time) we need to apply output of second switching table. how we can do this in MATLAB/Simulink?
My sampling time = fixed step size = 2e-05.
Were you able to resolve this?
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(Serious and active members are required.)
My research fields are Renewable energy, PV systems, wind energy systems, multilevel-inverters, observers and state estimation, induction motor fault detection, and diagnosis.
- Write and publish research papers together
- Split the publication cost (APC) together if necessary.
Dear Prof. Messaoudi,
I am interested to work with you since Renewable energy is one of my main and favorite research field. I have also completed a research in past based on renewable energy sources and their effectiveness.
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Sensorless Control of a Doubly Fed Induction Machine Based
on an Extended Kalman Filter
Improved Sensorless Control of Doubly Fed Induction Motor
Drive Based on Full Order Extended Kalman Filter Observer
These articles might be an asset, have a look:
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I am trying to use the advanced PID controller(auto-tuning) to control the speed of induction motor drive with FOC. I would like to ask how to get the transfer function for the induction motor and inverter by system identification method. anyone can give me useful information.
1. Instead of calculating transfer function or transfer function matrix better is to go with the state-space model........
With this type of modeling, then you can use the Kalman filter for identification purposes....
2. If you want to stick with the transfer function model...... it is better to first add a decoupling block to decouple the d-axis and q-axis circuits.....
Then depending on the type of control i.e FOC in your case.....you can easily relate rotor speed with q-xis voltage......for simplification you can make TL=0.....Also, as FOC is implemented so id=constat, meaning d-axis dynamics (or d-axis circuit dynamics) are totally ignored.....meaning as if there is no d-axis circuit.......but mind, it is valid only while decoupling block is used.......
Thus, you will finally have a plant with q-axis voltage as input and q-axis current as output with a cascade block whose input is q-axis current and output is torque developed with cascade block whose input is torque developed and output is rotor speed.....Finally, you can easily close two loops q-axis current and speed loops with two PI controllers to tune......here identification can easily be done by a Neural Network block......
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Hello Community,
Do you have any idea or suggestion about, how to create Slip and Slide at Motor Shaft on No load Standalone setup for Induction motor ?
Shall i connect another Controlled motor at Test Motor Shaft with different torque (i fear of breaking shaft)
Or some else suggestion ??
Good luck and thank you so much
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Are there any direct or indirect relationships derived between the two?
In LV distribution networks, reactive power is not efficient in modifying electrical parameters due to X/R ratio of conductors. Although works discuss the effects on voltage in LV, IM tends to generate voltage problems like undervoltage.
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I am madhav kumar, I have competed B.Tech (Electrical & electronics ) from Techno India in 2017 and masters in power electronic specialization from Birla institute of technology mesra Ranchi in 2019.
After my masters degree, I started trying for a government job. But due to Corona there was no vacancy and my age limit also expired. Now I want to go further with research. But I can't understand anything, what should I do?
My masters degree project is "Parameter estimation and implementation of maximum power point tracking algorithm for solar photovoltaic system".
I have also done "V/F control of Three phase Induction Motor" with my partner.
I have published 3 IEEE conference paper.
Please give me a proper suggestion and help which is good for my future??
Hi. Apply for PhD and continue your education. Then after that everything will be easier for you.
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I'm working on an induction motor drive with a scalar controller. As inverter modulation, I utilized both SVM and SPWM. I discovered that if the frequency and output fundamental voltage from SVM and SPWM are the same, the THD is about the same. The result can be seen in the image attached herewith. Can anybody explain why the THD is the same? Is THD only determined by the amount of fundamental voltage generated? Any literary references would be much appreciated.
Yes, I have already worked on improving the power quality of three-phase inverters by comparing 3 methods (SPWM, SVPWM and SHE PWM).
the best method was the SHE PWM which eliminates harmonics and gives a very low THD
Concerning your question, in another work, I made a comparative study between the vector and sinusoidal PWM, I found almost the same value of distortion (THD) for different switching frequency, but in the SVPWM, the switching losses decreases which increases the value of the fondalmental (I made a simulation under MATLAB and I validated the results experimentally by the FPGA tool (RT-Lab).
Kind regards
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If we design Single phase inverter or Three phase inverter with Induction motor as Load,
Shall DC Link be a storage Capacitor or simply Harmonic Elimination Capacitor ?
How Capacitor Should be selected ? Based on voltage or Capacitance and type of capacitor ?
It is not clearly mentioned the type of Invertor.
For domestic use DC to AC inverter DC link capacitor is nor neccessary but for inverter connecting to High AC voltage like Grid , DC to AC invertor needs DC link capacitor to reduce high frequency ripples at input side of invertor.
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Hi friends
In open Loop control of interior PMSM/Induction motor how will give excition vd, vq and any mathematics is there inside to give vd ,vq
Can you send me any related to paper .
set the rotational reference frame, Vd ref = 0 and Vq ref = fixed value
the fixed value of the Vq ref depends on how much modulation index you want to apply for the inverter
L. Zhong, M. F. Rahman, W. Y. Hu and K. W. Lim, "Analysis of direct torque control in permanent magnet synchronous motor drives," in IEEE Transactions on Power Electronics, vol. 12, no. 3, pp. 528-536, May 1997, doi: 10.1109/63.575680.
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Any available studies about the control of Permanent Magnet Induction Motor/Generator?
Thanks Anil for your suggestion. Yes it is very useful book. However, I am talking about a special machine type with special structure. The PMIM has a permanent-magnet (PM) rotor that is free to rotate inside a squirrel-cage rotor. The internal self-excitation from this PM rotor allows the PMIM to operate at a higher power factor and this is an advantage of this type. Unfortunately there is no plenty of research work about the control and analysis of this machine type
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Hi Friends ,
1.What is the reason of Vd=0, Vq=1, in surface PMSM and Vd=1, Vq=1 Interior PMSM, Induction Motor ? behind that any back ground
can you explain....
1 Assume we are dealing with transformed variables from
actual stationary 3 phase variables of machine viz synchronous or Induction motor to rotating ref frame ie d q and 0 sequence.
2. In the case of SM the rotating ref franme can be fixed to the daxis .Recall this d axis carries the field which is already excited via slip rings or pm so we dont need vd to excite a rotating field , we need only vq to produce the orthogonal torque component of flux.
3. In case of IM it is alittle more complex as the rotor carries no
current say at synch speed , the rotating flux has to be developed by both vd and vq (depending on ref frame fixed to stator flux or rotor flux both id and iq will have to be manipulated). In other words for an intuitive idea consider approx
a simple single phase IM circuit with just xm and r2/s . The stator current will consist of im and ir . ir is determined by both wsynch and slip at a particular mech wr . If we wish to simulate this as a dc motor in the rotating ref frame then we neeed to manipulate both vd and vq .
Cheers
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In MATLAB simulation of MRAS EMF based speed estimator block of 3 phase Induction motor pure integrator is replaced by first order low pass filter. How to select correct cut off frequency of first order low pass filter. is cut off frequency selection is important in speed estimation block.
Good day, where you able to get the answer for this?
IF you did, please kindly share
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To obtain dq components of the inverter voltage for unity power factor correction of a 3 phase induction motor
What is the modulation index (ma ) which is mentioned in the 2.2 equation?
Modulation index ma is the ratio of DC-link voltage and output voltage amplitude.
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I understand that MSCA detects fault characteristic frequencies and evaluate it through subtracting the magnitude of main frequency with the magnitude of fault characteristic frequencies in dB scale. And the lower the difference the more serious the fault.
But I want to know that is there any severity index to consider how the level of fault is, such that the category of low, medium, and high can be made?
We have done a few experiments in past years on BLDC motor. Based on MCSA, 3rd harmonic components of motor currents are analyzed to localize and isolate different faults. We did not do "fault thresholding" since it will be very specific for a system and it will differ based on the loads connected to the motor. However, for a constant load and operating environment, the magnitude of the 3rd harmonic components increases as the fault severity rises.
To my knowledge, there is no specific study that establishes a "severity index" based on MCSA. I suggest you look for different frequency domain features i.e. harmonic magnitudes, root variance frequency, peak frequency, SNR, entropy, THD, etc. Not all features will be suitable for all systems, you can find the most suitable features based on your problem definition. I can suggest you the following papers and you may look into the references cited in these papers for similar studies.
(1) T. A. Shifat and J. W. Hur, "An Effective Stator Fault Diagnosis Framework of BLDC Motor Based on Vibration and Current Signals," in IEEE Access, vol. 8, pp. 106968-106981, 2020, doi: 10.1109/ACCESS.2020.3000856.
(2) T. A. Shifat and H. Jang-Wook, "Remaining Useful Life Estimation of BLDC Motor Considering Voltage Degradation and Attention-Based Neural Network," in IEEE Access, vol. 8, pp. 168414-168428, 2020, doi: 10.1109/ACCESS.2020.3023335.
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I have designed 17 level 3 phase CHB MLI. Giving THD less than 5% for R and RL load. But when I apply it to induction motor load, I can see a voltage spike (to max volt) near each zero crossing. ( For each phase voltage). Which increases THDv to 30%. What parameters of motor may contribute to this?
Thanks all
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Hi everyone, I have problem with state space model of DFIG, the state vector formed by currents in (d,q) frame and input vector formed by voltages in park frame and the output vector is composed of currents (ids, iqs, idr, iqr), when i model the dfig with explicite equations in the park frame (d,q) it s ok but once i  use matrices to make the state space model it doesn't works please what can be the problem ?
please send me space state model of dfig
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In a single-phase uncontrolled rectifier fed VSI driven three-phase induction motor, the dc-link voltage reduces under loading condition of induction motor drive. How to select the optimum value of the dc-link capacitor to maintain the dc-link voltage constant over the entire range of the induction motor?
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Hi! Want to Simulate an Induction Motor using Simulink for generating normal / inter turn short circuit fault data for my ML based fault diagnosis system. Desire a model that incorporates saturation & iron losses in addition to variations in parameters to get realistic data for training my model. Help & guidance requested. Thanks.
I found these attached documents helpful for induction motor simulation in presence of stator faults.
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I am working in speed sensor-less control of induction motor and for estimation of speed i have used sliding mode observer. Using SMO I have estimated alpha-beta axis stator current and alpha-beta axis rotor flux accurately. though I have estimated currents and rotor fluxes accurately, I can not estimated speed. Is there any one who can help me with this issue?
I have also added the images of results that i have obtained.
If You divide by square od rotor flux value please limit this to 0.01 from down.
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I am working on speed sensorless direct torque control of induction motor and for that purpose I have estimated rotor flux accuratly now I want to estimate speed from rotor flux and is there any one who can help me to do so?
Hello Krunal Shah ,
There are many ways to estimate the rotor speed. You can use one of the well-known observers like Extended Kalman filter, Extended Luenberger observer (I say the extended version of Kalman and Luenberger observer because the model of the Induction motor is nonlinear and rotor speed-dependent), High gain observer, sliding mode observer, model reference adaptive system (MRAS), fuzzy logic observer, neural network observer,...
In your situation, I recommend the use of MRAS because you have already estimated the motor current and flux
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The speed estimation of induction motor at low speed is not precise and this affects the sensor less control of induction motor . I like to know whether the above limitation affect performance of Electric Vehicle when the sensor less induction motor is used to drive vehicle
As I know, even though there are a lot of works, where the sensorless control works nicely in no-load condition, the control often goes wrong when the load torque is applied. Also, the control accuracy at low speed remains an actual issue.
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Hello,
at the moment i am trying to make in simulink an induction motor with vector control. I have a model of an induction motor and the model of the vector control. My problem is the tuning of the PI-controlers for the speeds and for the velocity.
Are there some calculation methods to determine the values?
My interest is especially in the tuning of the two PI-controls for the current. Should the paramter of this controls be calculate successively or at the same time?
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I am working on the project of developing an algorithm for stator inter-turn failure diagnosis. For that, I am looking for online available data of the current signal from the faulty machine.
in you tube
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I have the battery and supercapacitor connected to an isolated Bidirectional DC DC converter i want to know how to simulate the converter system for an induction motor drive .I want to use the phase shift and duty cycle control ,I also want to show the starting acceleration ,coasting and braking models of EV using induction motor drive
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I want to research over using VFD in booster pumps and I wonder what is exact
relationship of power and frequency and how  hange in frequency afffect output power and torque of motor pump? I really appreciate any more information
I'm not too sure about this statement, as power mechanically is the product of rotational speed and torque, electrically it contains voltage and current - no frequency.
Even at varying frequency, the power extracted can remain constant if the torque is reduced the same was as the speed (or frequency) increases.
Therefore, there is no inherent relation between power delivered by the motor and the frequency it is operated from.
A most basic example:
Running at no load, the output power for any given frequency is zero.
Cheers - Martin
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I want to tune pi controller for multiphase induction motor drive but the torque and speed oscillates around set point and that oscillations is irregular and output of PI controller is also oscillates.
how to tune it to remove oscillations?
I have also attached the pic of responses.
I think that adaptive control is suitable for this case.
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How to check for different unbalance conditions and effect of positive and negative sequence voltages on efficiency and power factor of induction motor?
There are at least two ways to do it and they are not so simple.
The first one is to perform decomposition of the supply voltages into forward and backward symmetrical voltage sytem and make calculations for both of them.
You have to calculate input powers for both and output mechanical power also for both of them. The forward one is driving and the backward torque is breaking.
The other way is to comput the performance of the whole system by use of a dynamical mathematical model (including convereter if neccerary), wait for a steady-state (if it is going to be steady) and calculate input and output power.
In that case You can aso calculate power consumed by a converter.
Wish You success!
Piotr Wach, Opole, Poland
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I have gone through some papers related to DTC for five phase induction motor. And trying to simulate the circuit with their specifications using Matlab/Simulink.
But got stuck with feedback torque and flux that used to generate SVM .
Dear Ahmed,
Also i suggest you to see links and attached file on subject.
Best regards
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I have designed a 9-level inverter which was used to derive a single-phase induction motor. when measuring the THD, I found that the current THD is higher than the voltage THD as shown in Figures below. Current THD is 11.6% and voltage THD is 8.8%. Is there any reason why the current THD is higher than the voltage THD? Thanks a lot
@Wail Ali Ali Saleh,
What comes to my mind is in this situation there could be two sources for the current THD. Either you have a some sort of switching device between your multi-level inverter and the induction motor or the motor core is saturated.
The former is less likely because a switching device would have produced high order harmonic distortions but in the FFT image that you posted the main contributor is the 3rd order harmonic, which narrows down my guess to the latter option: "saturated motor core".
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I am currently researching the effects of an increased air gap in an induction motor.
So far i am able to calculate the approximate difference in efficiency, power factor and thus the nominal current. However i am struggeling with the Starting current/torque and the break down torque.
I know the reactances of the motor will decrease. But i have found some (old, from the eighties) equations on these torques, both give an inverse dependence on the reactances. This indicates an increase in starting and breakdown currents, which i know is incorrect.
According to my data they both should decrease, i am know searching for a way to accuratelly predict the decrease, preferably without the use of programming or special software. This is because the company i'm working does not have the licences for such programs.
Dear Menno,
Reluctance increases with the airgap while reactance decreases. Are you not confusing them?
Anyways, the magnetizing current of the motor depends on the specific magnetic loading and the air gap of the machine. A large air-gap leads to higher magnetizing current (and poor power factor). Indeed, the more you increase the air gap, the less "usefull magnetic interaction" you have between the rotor and the stator. Thus, to be able to start turning the same rotor (so same torque), you need to apply more current in the further away stator in order to compensate for the bad "magnetic interaction" between the stator and the rotor.
Now, to "accuretaly predict" but "without the use of programming" doesn't seem very compatible. Though, you can find quite easy-to-use software that are open-source (understand free of cost, if that is an issue):
And... many others
Best,
Guillaume
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Hi, I want to calculate the circuit of thermal resistance of an induction electrical motor.
In some reference they draw circuit that shown resistance. like attached picture.
Now i have a question about it:
1- how many resistant must be consider in parts, like shaft, rotor, stator and ...
Hello! The experience I have is based on thermal circuits calculating the elevation of temperatures in transformers. Regarding the calculation of thermal resistances, it is necessary to consider the three types of heat exchange:
- Conduction: Rcd=l/(k*S), where l is the length of the path that the heat will travel [m], k is the thermal conductivity of the material [W/(m*K)] and S is the section cross section available for heat to flow [m²];
- Convection: Rcv=1/(h*S), where h is the convection heat transfer coefficient [W/(m²*K)] and S is the cross section available for heat to flow [m²];
- Radiation: Rrd=1/(hr*S), where hr is the radiation heat transfer coefficient [W/(m²*K)] which is temperature dependent and it makes the circuit solution iterative and Sr is the radiant surface [m²].
As for the question regarding the number of resistances required, it is a question of discretization, the more resistances, the more precise, but the greater the effort of discretization and computation. I consider it a good approach to use the smallest number that one can intuitively be deduced with the circuit nodes arranged at the points where it is intended to know the temperature rise.
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I am trying to simulate conventional direct torque control of six phase asymmetrical induction motor drive. but it does not give appropriate results and i have tried to rectify the error but cant identify it. Is there anyone who can help me to to identify the error? if you wish i can also provide the model as well....
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I am working on the speed control of the induction motor. I am using a Quadrature encoder having two inputs QEPA and QEPB and having a resolution of 48ppr. code is generated through an embedded coder in MATLAB/SIMULINK. But I can't able to measure the speed properly. I have gone through the many articles, every article mentioned about the encoder having three inputs QEPA, QEPB, and Index pulse. Can anyone suggest me how to calculate the speed of induction motor having two inputs from the encoder
Hi
Regards
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I am trying to tune the PID controller for FOC of Induction motor using the control system tuner app but i got the error mentioning that " Linearizattion resulted in a system that can not be tuned , you may try the different operating points". I have also tried many different operating points but the same error is repeated , please suggest solution to this problem
Thank you sir...
sir, is it get converged ? and give proper result?
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Hi all, I am trying to run a co-simuliation between Simulink and Simplorer. In Simplorer, simulation is successfully completed but Simulink reports an error.
Has anybody experience with this problem?
Saptarshi Pal Chaudhuri i have the same problem. do you solve this problem?
can you help me about that
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What are the pros and cons of existing induction motor inter-turn short-circuit fault diagnosis methods? i.e. motor current signature analysis (MCSA), flux monitoring, air-gap torque monitoring, vibration monitoring, thermal monitoring. Which one has been extensively used in real industry applications (for what reasons)?
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My project about speed control of induction motor using PID and ANN controller comparision but i am unable to get the ANN controller based induction motor speed control . so any one there please help me.
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My name is pavan. I am recently working on project in my under graduation known as speed control of induction motor using AI controller . For that I need speed control of 1 phase AC induction motor using PID controller values by which I can train my controller. So, I am hoping that I would get this model and train my controller there by completing my project as soon as possible.
You are welcome
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Hello,
I want to check DC Link stability connected before inverter and 3ph Induction motor.
If i change Torque and Speed of Motor and check DC Link, there might be some variation in DC Link. Am i right ?
Question is: How to check stability of DC Link ? Any method ? Mathematics ? Plots ?
Hi, torque and speed are related to the current and frequency supplied by the 3p inverter, respectively. There is a linear relationship between the d current and the torque of the machine for a given constant rotor flux operation in the linear region of operation (max torque region). Consequently, it is the change in the torque how is translated into a disturbance to the DC-link controller. You have two options: first, to model the whole system (inverter + motor) and derive the transfer function which relates the torque to the DC-link or, second, finds an empirical transfer function Gvdc/id. Thus, using this transfer function evaluates the closed-loop system stability which will depend on the controller you are using too.
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I am trying to simulate FOC of Induction motor with SVPWM using MATLAB Simulink. In the motoring mode, the current is pure sine wave with desired frequency but in generating mode, the harmonic content is very high. What are the possible reasons and correcting action to rectify this problem?
Sir I have implemented field oriented control of six phase induction motor using hysteresis controller but now i am trying to use SVPWM for the same but i cant get accurate results Nikhil Krishna Bajjuri
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Hello... I need the detailed specs for the following motors for laboratory set up:
1-Six phase induction motor
2-Five phase PMaSynRM
3-Five phase switched reluctance motor.
So does anyone has these specs?
We are a company specialized in the design and manufacture of electric motors, electric generators and magnetic systems http://www.erneo.fr.
Based on your specific need, ERNEO is able to develop induction or reluctance machines with mutiphase winding (double star, polyphase, etc.).
Best regards.
Dr. Nassim BEKKA Electromagnetic Designer ERNEO SAS 505b rue Louis Lépine 34000 MONTPELLIER FRANCE Mail : nassim.bekka@erneo.fr Tel : +33(0)4.11.28.17.21 Web : www.erneo.fr/
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I am trying to simulate FOC of Induction motor with SVPWM using MATLAB simulink. It is working accurately in the motoring mode but in generating mode, there are notches of small magnitude at the regular interval. What are the possible reasons and correcting action to rectify this problem?
Problem has been solved. and it related to tuning of PI Controller. now its working fine in all four quadrants of operation. @ Kris Scicluna
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Hello All,
I think: For speed control of 1ph AC Induction motor
I Guess below is correct thing
DC Source --> Boost Converter with Single IGBT --> Z Source Inverter ---> 1ph Inverter with 4 IGBT --> 1ph Induction motor
Here i set some reference speed & compare with Actual speed and apply PID controller and Control PWM of Inverter.
I have doubt in my Second assumption. Please tell me is it correct ?
DC Source --> Boost Converter with Single IGBT --> Z Source Inverter ---> 1ph Inverter with 4 IGBT --> 1ph Induction motor
Here i set some reference speed & compare with Actual speed and apply PID controller and Control PWM of Boost Converter IGBT. (I keep Fix PWM for single phase inverter)
Dear Lalit,
You can control the speed of the induction motor by changing the motor voltage while V while keeping V/F consatnt where F is the frequency of the voltage applied on the motor. This condition is required to keep the flux phi constant.
So, yes you can use DC/DC boost converter to control the voltage and then you can use DC/AC inverter to generate the AC for the motor. You have to change the frequency of the inverter by changing the switching speed of the inverter switches. You have to generate as sinusoidal waveform as possible.
This can be accomplished by using PWM and filtering.
Best wishes
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I want to identify Induction motor Air-gap eccentricity fault. According to the formula of finding Air-gap eccentricity fault, I should get the Air-gap eccentricity fault at 1728 sampling Hz but its not appearing on this frequency
If the supply frequency is varied the machine parameters , losses and efficiency will be varied.
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I am trying to tune a pid controller using pid tuner app in MATLAB simulnik for indirect field control of induction motor, it shows the error that, "sample time is small as compared to response time. response plot is trucated due to too many data points" what should i need to do to rectify this problem?
You need system state space. You should put inport before system and outport after the system output. I think your system also discrete time. for such system you should use dlinmod.
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As we know initially PF in case of induction motor is lower, but after some time PF becomes improve. Can any one explains that how we can improve the PF instead by using the parallel capacitor bank?
Use VFD (variable frequency drive) starter
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The idea is to power the electric vehicle with a 48 V battery. An inverter may be used to produce 3 phase voltages to power the induction motor which is designed for 48 V.
It depends on your application and what you mean by "electric vehicles".
Normally for a city vehicle at least a 100 kW electric motor is needed.
As you know, electrical active power is (1.73) VL IL Cos(phi) . If you consider the cos(phi) =1 and a Delta connection and 48 volts system, so:
IL=100kW / (48) (1.73) = 1200A for each phase. Which is really a great amount of currents, and needs a great deal of copper to allow it to pass in order to minimize the ohmic loss and heat.
Instead, if you use 400 volts system :
IL=100kW / (400) (1.73) = 140 A
It is completely tolerable.
Less copper, lower weight, lower price, less heat
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The signals for induction motor current are plotted in frequency domain using MATLAB.
I attached the plot for more explanation.
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Hello,
I am working in a project to detect stator inter turn  fault where I need a working mathematical model of squirrel-cage induction motor in matlab code, can anybody provide pointers...
Were you able to simulate the inter turn short circuit fault using the suggested models? Did u use Simulink for simulations?
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I need a Matlab Simulink model of single phase induction motor ? Can anyone help me in this regard?
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Hello;
Is it possible to apply the energy management for DTC controlled induction motor drive?
Thanks and best regards
@ O. Peter, following
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I have simulated the 0.37KW capacitor start induction motor in ansys maxwell RM Xprt. Its efficiency is 45% (percent), results attached. These are no load results. I have few questions
How to perform the on- load analysis of motor using RM Xprt or 2D analysis?
How to optimize the winding design, wire size and no of turns etc.?
How to select the starting capacitor for this motor?
How to select the rotor shape, its dimensions and torque optimization?
How to increase the overall efficiency to fulfil the IE1 and IE2 standard?
Simulation results shows that stator losses are 129watt, thats hufe losses in 373 watt motor, How can I reduce it ?
How to select the switching time of auxilery winding ?
Any paper, books, tutorials or presentation or videos that can help me in this regards. Please share
Your kind support and recommendation will be highly appreciated.
Thank you