Mojtaba Bahrami Kouhshahi

Mojtaba Bahrami Kouhshahi
Nexteer Automotive

PhD

About

15
Publications
8,225
Reads
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140
Citations
Citations since 2017
7 Research Items
114 Citations
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20172018201920202021202220230510152025
20172018201920202021202220230510152025
Introduction
Detail oriented professional with 7+ years of experience designing and controlling various types of electrical motors and generators using finite element analysis software including about 4 years of experience working on the state-of-the-art radial and axial field magnetic gears and linear actuators. Deep knowledge of electrical machines concept, winding design and analysis, permanent magnets and analytical modeling.
Additional affiliations
August 2015 - April 2019
Portland State University
Position
  • Research Assistant

Publications

Publications (15)
Article
An axial-flux magnetic gear (MG) is integrated into a radial field stator to construct a unique magnetically geared generator for low input speed applications. The high-speed rotor of the axial-flux MG uses a flux-focusing typology. This paper presents the stator design and experimental testing of this unique proof-of-principle axial-flux focusing...
Article
Full-text available
The torque density characteristics for an axial flux magnetic gear using a flux‐focusing topology is experimentally studied when using neodymium iron boron (NdFeB) rare‐earth magnets. A geometric parameter sweep analysis was utilised in order to maximise both the calculated volumetric and mass torque density. The calculated torque and torque densit...
Conference Paper
A magnetically geared lead screw is able to convert high-speed rotation to low-speed translation via magnetic gearing. In this paper a new type of magnetically geared lead screw is presented that uses translator rings without any skewing. The magnetic gearing is accomplished by utilizing an inner rotor with helically skewed magnets and an outer cyl...
Article
A realistically sized magnetically geared lead screw is designed, analyzed and experimentally tested in this paper. By using mag-netic gearing this device is able to convert low speed linear mo-tion into high speed rotary motion. The advantage of the pro-posed design over alternative linear magnetic gear and magnetic lead screw devices is that the...
Conference Paper
In this paper an axial flux magnetic gear (AFMG) is proposed that has an integrated outer stator. This axial flux magnetically geared motor (AFMGM) is unique in that the stator shares the high-speed rotor with the AFMG, so there is no need for a separate rotor. The high speed and low speed rotors use a flux-focusing typology. The stator is mounted...
Research
Full-text available
Brushless DC (BLDC) motors and their drives have been increasingly considered in a broad range of applications due to their significant features. The implementation of these motors is possible thanks to firstly, the progress of permanent-magnet (PM) technologies which provide high efficiency, power density, and torque for these motors. Secondly, th...
Article
Brushless DC (BLDC) motors and their drives have been increasingly considered in a broad range of applications due to their significant features. The implementation of these motors is possible thanks to firstly, the progress of permanent-magnet (PM) technologies which provide high efficiency, power density, and torque for these motors. Secondly, th...
Article
Full-text available
In this paper, an optimal solution to the harmonic reduction problem in a cascaded multilevel inverter with non-equal DC sources using a genetic algorithm (GA) is presented. Switching angles are generated for different values of modulation index by the proposed algorithm, considering minimum voltage total harmonic distortion (THD) whereas selected...
Article
Full-text available
This paper presents a direct torque control technique for brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the brushless DC motors. In order to solve the problems associated with conventional PI speed controller, a speed con...
Conference Paper
Considering the widespread use of induction motors, proper control of them in order to increase efficiency, improve performance characteristics and etc., has become more important. Induction motor control systems are nonlinear systems with many constraints, therefore tuning of such systems require the use of some approximations and simplifications...
Article
Full-text available
This paper presents a direct torque control (DTC) technique for Brushless DC (BLDC) motors with non-sinusoidal back electromotive force. DTC has some benefits such as faster torque response and reduced torque ripple for driving the BLDC motors. Because of ignoring stator flux linkage in DTC in constant torque region, BLDC motors driving is not comp...
Article
Full-text available
This paper presents a direct torque control technique for Brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the Brushless DC motors. The Sliding mode observer, which is robust to parameter uncertainties, can be used to estima...

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