Electric Machines - Science topic

The growing interest in electrical machines equipped with multiphase configurations has directed the research to the conception of new design methods and optimization strategies to maximize the performance and the efficiency of the machine for its specific application. In this context, a noticeable gap persists in the comprehensive generalized theo...

This paper presents a new means to control the processes involving energy conversion. Electric machines fed by electronic converters provide a useful power defined by the inner product of two generalized energetic variables: effort and flow. The novelty in this paper is controlling the desired energetic variables by a Data-Driven Control (DDC) law,...

Circulating currents occurring in windings of electric machines received rising interest recent years. Circulating currents represent unwanted currents flowing between parallel-connected conductors. This phenomenon is due to various reasons such as asymmetries in the winding and differences in electric potential between parallel-connected conductor...

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The article is devoted to the study of dynamic processes of Hybrid Electric Machine (HEM). According to the concept of electric machines, it is known that every electric machine is capable of operating in motor and generator modes. In this case, there is an interest in the essential study of the introduction of one hybrid electric machine on board...

Electric Machines (EMs) have gained increasing importance in the mobile hydraulic industry as prime movers for hydraulic actuation systems. Therefore , their design and sizing are important aspects for any system layout architecture. The on-road vehicle industry has exploited EM versatility by proposing different sizes for various applications. How...

The aviation industry is undergoing electrification due to the increased global focus on reducing emissions in air traffic. Regarding the volatility of raw material prices, one main objective is the increase in the specific power of the motor. This matches the ambitious targets of the CoE project (Center of Excellence) in Finland on high-speed elec...

This paper presents a new means to control the processes, which involve the electric energy conversion. Electric machines fed by electronic converters provide the useful power defined by the inner product of two generalized energetic variables: the effort and the speed. The novelty of the paper idea is to control the desired energetics variables by...

Energy transition and decarbonization present significant challenges to transportation. Electric machines, such as motors and generators, are increasingly replacing internal combustion engines to reduce greenhouse gas emissions. This study focuses on enhancing the energy efficiency of electric machines used in vehicles, which are predominantly powe...

Electric machines form an essential part of a wide range of modern systems. When speed control is required, the use of pulse width modulation‐based inverters is generally the solution of choice. It is also usual to connect the machine to the inverter using a cable. The combination of these three elements produces the potential for voltages which ex...

In the realm of electric machines, there has been an increasing interest in multiphase (greater than three-phase) and hybrid excited machines. The benefits of multiphase machines include improved power density, efficiency, reliability, and fault tolerance, while for hybrid electric machines, the literature offers a variety of topologies, each with...

The article discusses ways to reduce losses to increase efficiency in electric machines. The amount of energy loss is determined by the efficiency coefficient. The issues of changing the size of an electric machine under electromagnetic loads with a constant power source and constant voltage are considered. It is taken into account that reducing en...

Campbell diagram is plotted from calculation results to identify a rotating object’s critical speeds. The Campbell diagram is formed by calculating the supported natural frequencies in a defined operation speed range. It is an important step when designing rotating machines, e.g., an integrated high-speed electric motor that can be sensitive to the...

The metallic components of an electric machine exert a notable impact on the electromagnetic transmission between an external recipient and an internal shaft sensor. The RTMS (rotor temperature monitoring system) is aimed at boosting power transfer in the machine, regardless of the considerable impact of its components. This research assesses the i...

A pre-print of our model-based research on the motoring control design and implementation for an opposed-piston free-piston engine.

This virtual lab integrates the Matlab&Simulink experimental model, which gives students the opportunity to verify their theoretical knowledge. The paper proposes the development of the Simulink model of the DC motor, aiming to achieve a more effective speed control. We describe the implementation of a virtual lab based on mathematical models. Our...

In recent years, the switched reluctance machine (SRM) represents a contemporary competitive technology in the fields of automotive and aeronautics, because their growing needs for electric drives with a frequent and important high-speed variation. This paper presents an application of the fractional order control of the speed of switched reluctanc...

Adapun tujuan tugas akhir ini adalah untuk merancang mesin pencacah rumput pakan ternak menggunakan sistem penggerak motor listrik dan untuk mengetauhi kemampuan produksi (pada aktivitas mesin) pencacah rumput. Mesin ini merupakan mesin serbaguna sebagai perancang hijauan khususnya digunakan untuk merancang rumput pakan ternak. Pada pembuatan tugas...

Using fortran/c/c++ solutions we offer consultancy in the design of electrical machines.

Renewable energy sources (RES) are a game-changer since they produce no greenhouse gases (GHG). There is an increasing amount of interest in it across the world. The intermittent nature of RES makes it difficult to incorporate them into the existing power grid infrastructure and for use in electrical machines for industrial and domestic application...

Electric machines emulators (EMEs) based on hardware-in-the-loop (HIL), which effectively act as emulators to mimic the actual motor behavior of Interior Permanent Magnet (IPM) machines. EME is frequently used to evaluate motor controller and motor control methodologies prior to development. The inverse magnetization motor model, which is used as t...

The growth of electrical machine applications in high-torque environments such as marine propulsion and wind energy is encouraging the development of higher-power-density machines at ever higher efficiencies and under competitive pressure to meet higher demands. In this study, numerical simulations are performed to investigate the characteristics o...

In electric machine design, efficient methods for the optimization of the geometry and associated parameters are essential. Nowadays, it is necessary to address the uncertainty caused by manufacturing or material tolerances. This work presents a robust optimization strategy to address uncertainty in the design of a three-phase, six-pole permanent m...

The reliability and efficiency of components are key aspects in the automotive industry. Electric machines become the focus of development. Thus, improvements in efficiency and reliability have gained significance. While it is established to attach sensors to the fixed parts of machines, such as stators, moving parts like rotors pose a major challe...

Energy storage is a crucial technology for facilitating the integration of renewable energy sources (RES), such as wind and solar energy, into the electrical grid. The challenge of maintaining a balance between incoming and outgoing grid power can be effectively addressed by integrating energy storage technologies with inherently intermittent RES....

The paper refers to an electric machine (motor/generator) with an adjustable magnetic field, because its rotor has a special construction that allows the deformation of its elastic permanent magnets. The permanent magnets deform due to a clamping stroke parameter and in this way the flux density of the magnetic field as well as the width and length...

Advanced slot and winding designs are imperative to create future high performance electrical machines (EM). As a result, the development of methods to design and improve slot filling factor (SFF) has attracted considerable research. Recent developments in manufacturing processes, such as additive manufacturing and alternative materials, has also h...

This paper deals with the electromagnetic characterization of a laminated toroidal ferromagnetic core made through additive manufacturing, specifically using the laser powder bed fusion process. The continuing demand for increasingly efficient, lightweight, and higher performance electric machines is creating huge challenges in the design and reali...

The design of electric machines for the aviation industry is associated with a large number of difficulties, one of which is the selection of the optimal number of slots that ensures optimal performance of electric machines. This is especially important for multi-pole designs, where an incorrect number of poles can result in unsatisfactory performa...

A new dual-motor plug-in hybrid system has been developed in this paper. The system has a variety of operating modes such as "pure electric drive", "series hybrid drive", "parallel hybrid drive", and "pure oil drive", which can maximize fuel efficiency according to the driving conditions of the vehicle and the needs of the driver. By adding high-po...

This paper presents a promising winding technique which enables higher power-densities in partially superconducting electrical machines with a slotless stator, e.g., self-supporting windings. Firstly, the formulation for defining the skewing factor of the helical winding is given. Afterwards, the skew angle and how diverse winding configurations ca...

The calculation of magnetically induced vibrations in the stator of an electric machine involves, on the one hand, the determination of the magnetic forces originating from the air gap field and, on the other hand, the calculation of the mechanical eigenmodes and eigenfrequencies. This work presents a new method for the mechanical modelling of the...

Multiphase Fractional Slot Concentrated Windings (FSCWs) are an attractive potential solution in the design of permanent-magnet synchronous machines as they combine the advantages of multiphase windings, such as power segmentation and fault tolerance, with the benefits of FSCWs, like high manufacturability and short end coils. The adoption of multi...

Nowadays rare-earth magnets available in the market are limited, while demand for them is increasing, therefore development of electrical machines without magnets of this type becomes extremely important. Simultaneously, synchronous machines without magnets have poorer torque to weight and torque to volume characteristics compared to machines equip...

Cryogenic electric machines (CEMs) offer significant potential for highly power-dense and ultra-efficient net-zero aircraft. Aluminum (Al) displays superior conductivity to copper (Cu) at cryo-temperatures, making Al Litz wires an attractive option for CEM windings to minimize DC and eddy losses. However, accurately quantifying Al Litz wire losses...

As the world focuses more on renewable generation, Permanent Magnet Synchronous Machines (PMSMs) are seeing greater use in wind turbines and electric vehicle applications. To address the computational demands of full fidelity machine models using Finite Element Analysis (FEA) or the expense of constructing an experimental test rig for practical per...

Permanent magnet (PM) electrical machines are an ever increasingly utilised motor topology for numerous industries such as automotive, aerospace, manufacturing, energy and premium consumer goods. PM electrical machines exhibit high power density, high operating efficiency and high torque to current ratio, whilst remaining robust and fault tolerant....

This paper introduces a new motor design for traction applications that achieves high power density and meets the power density target of 50kW/L target set by the US Department of Energy. The proposed motor has a doubly salient structure with concentrated toroidal 3-phase windings and permanent magnets (PMs) in the stator and a reluctance rotor, im...

Extensive literature has been produced on the investigation of eddy current losses in Surface-mounted Permanent Magnet (SPM) electric machines in presence of circumferential segmentation by analytical solution of two-dimensional (2D) models. What is missing in the present literature and constitutes the aim of this paper is a simple but accurate pro...

In this paper, we propose a topological data analysis (TDA) method for the processing of induction motor stator current data, and apply it to the detection and quantification of eccentricity faults. Traditionally, physics-based models and involved signal processing techniques are required to identify and extract the subtle frequency components in c...

Homopolar AC Machines (HAMs) are of interest because of low rotor loss and the ability to operate at high speeds. These machines are frequently utilized in flywheel energy storage systems but are dominated by permanent magnet or induction machines in other contexts such as vehicle traction. The aim of this work is to explore a new type of homopolar...

Magnet-free variable phase-pole machines are competitive alternatives in electric vehicles where torque-speed operating region, reliability, cost, and energy efficiency are key metrics. However, their modeling and control have so far relied on existing fixed-phase and pole-symmetrical models, limiting their drive capabilities especially when switch...

Environmental concerns have pushed toward electrified technologies for off‐road vehicle actuations that can lower greenhouse gas emissions and reduce energy consumption. Replacing a central diesel engine with a dedicated electric machine (EM) as a prime mover for the hydraulic supply offers several opportunities for so‐called ePumps (aka electric‐d...

The paper proposes a method for establishing the presence of several of the most common defects of rotating electric machines of alternating current using discrete wavelet transform of their vibration signal. It is shown that discrete wavelet transform is one of the most effective methods of pre-processing vibration signals formed from the operatio...

In the modern world, reducing gaseous emissions has been a motivational driver and enabler of low-carbon technology development. The release of excessive carbon emissions into our atmosphere is considered a global issue, with academia and industry intensely engaged in developing a viable solution for its reduction. On the question of lowering gase...

This paper presents the design of a 2 MW superconducting electric machine capable of replacing a conventional regional aircraft turbine. The main objective of this work is to advance in the path towards the more-electric aircraft, by incorporating and assessing in the same design technologies such as a superconducting rotor and its cooling by means...

Industry is increasingly adopting high-speed electric machines due to their high-power density and low cost. However, increasing the speed leads to many challenges that are worth to study since they have relevant impact on the design of the machine. One of these challenges is the losses in stator winding assembly. At low frequency, losses in windin...

In this paper, a three-dimensional turbulent fluid dynamics numerical model of a 311 MVA full hydroelectric power plant unit is made, using the finite element method, to study and understand the ozone transport mechanisms inside the enclosured electric machine structure. In the real world, ozone is produced by partial discharges related to faults o...

The manufacturing processing of Electrical Steel Laminations (ESLs) for electric machines comprises cutting, stacking, and housing techniques which can result in plastic deformation and residual stress in the soft magnetic material. These manufacturing processes result in decreasing the magnetic quality and a local increase in both the static and d...

Due to new requirements regarding the efficiency of electrical machines it is necessary to steadily improve machine concepts or create new ones. Therefore, manufacturing technology has to be continuously improved, adapted or developed new. Forming technology offers an excellent opportunity to implement components for highly efficient electrical mac...

Electrification of off-highway vehicles offers the benefits of improved energy efficiency, enhanced control, and reduction in greenhouse gas emissions. However, progress towards electrification has been limited by the low torque density (30 $\rm{kNm/m}^{3}$ ) of conventional electric machines compared to mobile hydraulic machines (up to approxima...

Multiphase electric machines offer benefits of fault tolerance and reduced power electronic switch ratings per phase. These machines are also capable of independently controlling multiple airgap fields with differing number of pole-pairs (spatial harmonics). This presents opportunity to improve torque density, magnetically levitate the rotor, and w...

Electrical machines play a major role in achieving a more sustainable economy by driving the further electrification of industry and transportation. To enhance the electric motor productivity during production and the efficiency during operation, it is essential to maximize the material yield rate during the production of stator and rotor sheet sta...

Model predictive control (MPC) is a popular control technique to regulate multiphase electric drives (ED). Despite the well-known advantages of MPC, it is sensitive to parameter detuning and lacks the capability to eliminate steady-state errors. The appearance of an offset between the reference and measured currents can significantly jeopardize the...

This is a special issue from Energies: https://www.mdpi.com/journal/energies/special_issues/U3TJHP058D There are some discounts for review and early bird technical papers.

Dear Colleagues, Zero-carbon emission is currently pushing the rapid development of electric propulsion, including electric vehicles and electric aircraft. Electric machines, regarded as one of the core components in electric propulsion, are being intensively studied to meet the increasing demand for performance in the drive system. Various types...

On board there is a temporary water reservoir called a hydrophore? Hydrophore serves to distribute fresh water that will flow to all parts of the ship's hull or accommodation on the ship, the hydrophore pressure tank cannot work for a long time if the ship is in black out condition. This research method is a type of Experimental research. Data coll...

In response to the crack failure of a drive shaft of a type of motor subjected to high torque after a long period of overload operation, a remanufacturing study was conducted using laser cladding technology. In this paper, the remanufactured material was designed from the material composition of the motor drive shaft and the processing parameters w...

For the full text please visit: https://sparklab.engr.uky.edu/publications/ or https://ieeexplore.ieee.org/document/10269383

The automotive industry is one of the main employers in industrialized countries [...]

Electric machines are important devices that convert electrical energy into mechanical energy and are extensively used in a wide range of applications. Recent years have seen an increase in applications where electric motors are used. The frequent use of electric motors in noise-sensitive environments increases the requirements placed on electric m...

In the current technological era, with the rapid advances in low-carbon power generation solutions, there has been renewed interest in the Free Piston Engine (FPE) as a viable thermal propulsion technology. However, describing and capturing the intrinsic non-linear dynamics of the FPE is computationally challenging and, understandably, is generally...

This paper deals with the optimization of electrical machines by means of ANN-based classification and regression models. Geometrically (or otherwise) unfeasible designs are detected with high accuracy during the optimization process by means of an ad hoc classification model, whereas continuous targets are predicted through regression models. Trai...

Axial flux machines (AFM) are promising alternatives to radial flux machines for applications that benefit from high torque density and a large diameter to axial length ratio, such as in-wheel traction motors. However, the 3D flux paths in AFM present unique challenges to manufacturing laminated stator cores. This paper positions metal additive man...

Electric machines (EMs) act as prime movers for hydraulic machines (HMs) in an electrified off-road vehicle (ORVs) fluid power (FP) system. Although there are mature studies on EM sizing, performance optimization, and control algorithm for on-road applications, the current EM sizing methods do not address the challenges unique to FP systems in ORVs...

In this paper, the analysis, and design of the switched reluctance motor (SRM) for the ceiling fan with higher service value are presented. For efficient SRM ceiling fan motor design, a commercially available induction motor ceiling fan is used as a reference design. The critical parameters such as stator and rotor pole arc angles, number of turns...

The reliability assessment of electric machines plays a very critical role in today’s engineering world. The reliability assessment requires a good understanding of electric motors and their root causes. Electric machines mostly fail due to mechanical problems and bearing damage is the main source of this. The bearings can be damaged by mechanical,...

Dear Colleagues, It is our pleasure to invite you to participate in ROPEC 2023 by submitting novel and original research papers on any topic related to this special session. In general, condition monitoring consists of detecting changes in the operating conditions of the machines or systems and their components from different physical variables, s...

The objective of this paper is to present a comprehensive analysis of hybrid excitation synchronous machines, including an examination of various structures found in scientific and technical literature, along with their advantages and drawbacks. Additionally, different methods of classification for these structures will be explored. The paper also...