FEA based Separation of Torque Components in Interior Permanent Magnet Machines

Understanding the torque behavior of Interior Permanent Magnet (IPM) machines is critical for the motor design and the end application. The net torque is sum of mean torque and pulsating torque. Pulsating torque is an undesirable effect causing mechanical vibration and premature aging of drivetrain....

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Bibliographic Details
Main Authors: Jaffar, Mohamed Zubair M, Husain, Iqbal
Format: Conference Proceeding
Language:English
Subjects:
Air gaps
FEA
Interior PM machines
Magnetic flux
Magnetic separation
motor design
Reluctance motors
Rotors
Saturation magnetization
Torque
torque measurement
torque ripple
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Summary:Understanding the torque behavior of Interior Permanent Magnet (IPM) machines is critical for the motor design and the end application. The net torque is sum of mean torque and pulsating torque. Pulsating torque is an undesirable effect causing mechanical vibration and premature aging of drivetrain. Based on electromagnetic sources, the torque is separable into cogging torque, reluctance torque and mutual torque. This research presents a method to decompose these components with the aid of two synthesized machines derived from a reference IPM using Finite Element Analysis (FEA). By comparing superposed torque profile with reference motor's profile, the method is validated on an 18-slot 4-pole machine with I-type and V-type rotor magnets, operating under varying current commands. In the design stage, the two synthesized machines enable independent control of the magnet flux linkage and saliency ratio to achieve targeted performance. The second utility is in torque ripple minimization, for which trends in the dominant harmonic of each torque component are obtained as functions of pole arc to pole pitch ratio and slot opening to slot pitch ratio. Experimental results for the reluctance torque are provided by testing on a fabricated synchronous reluctance (SyR) prototype.
ISSN:2329-3748
DOI:10.1109/ECCE.2019.8912710