The concepts of dual three-phase windings and variable flux memory (VFM) rotors are integrated to improve the speed range, efficiency, fault tolerance, and flux regulation of drive systems, which are crucial in electric vehicle (EV) tractions. Two VFM machines with different dual three-phase winding configurations, i.e., the classic coupled windings with 30° phase shift and the segregated windings without phase shift, are comprehensively compared based on the theoretical calculations on winding functions and winding factors as well as the finite element (FE) simulations on field distributions, back electromotive forces (back EMFs), torque capabilities, de/remagnetizations, and efficiencies. The results indicate that the coupled out-of-phase VFM machine benefits from the increased winding factors and thus the slightly higher back EMFs and torques. More importantly, the segregated in-phase VFM machine is advantageous in fault-tolerance, and its flux regulations are remarkably enhanced with the specific de/remagnetizations method due to its asymmetric winding layout. A segregated in-phase VFM prototype machine is fabricated and tested for experimental validations.
Comparative Investigation on Dual Three-Phase Variable Flux Memory Machines for Vehicle Tractions
IEEE Transactions on Transportation Electrification ; 10 , 3 ; 5119-5130
2024-09-01
13466224 byte
Article (Journal)
Electronic Resource
English
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