Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion

Okada, Takeshi; Kosaka, Takashi; Matsumori, Hiroaki; Matsui, Nobuyuki

doi:10.3390/wevj12020058

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Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion

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Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Aichi 466-8555, Japan

Author to whom correspondence should be addressed.

Academic Editors: Zi-Qiang Zhu, Ayman EL-Refaie and Hui Yang

World Electr. Veh. J. 2021, 12(2), 58; https://doi.org/10.3390/wevj12020058

Received: 3 March 2021 / Revised: 24 March 2021 / Accepted: 30 March 2021 / Published: 2 April 2021

(This article belongs to the Special Issue Novel Permanent Magnet Machines and Drives for Electric Vehicles)

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Abstract

A demand for high efficiency traction motors has been accelerated by the promotion of electrified vehicles, such as battery and fuel cell electric vehicles. As a part of development of the high efficiency traction motor, this paper reports a comparative study on two kinds of hybrid excitation flux switching motors (HEFSM) as a variable flux machine. One is the conventional HEFSM, which consists of a stator with constantly magnetized-permanent magnets, field excitation coils (FECs) and three-phase armature windings, and a rotor with salient poles like a switched reluctance motor. The other is a HEFSM employing variably magnetizable-permanent magnets (VM-PMs) that replace a part in the FEC slot area in the conventional one. Based on the variable magnetization nature of VM-PMs, the latter HEFSM promises that the replacement of magnetomotive force (mmf) of FECs with that of the VM-PMs makes the motor efficiency better at both low- and high-speed under the low-torque condition, that is, at both urban driving or highway cruising. To verify that, finite element analysis- (FEA)-based design simulations, as well as experimental performance evaluations for the two kinds of HEFSM, were conducted under reasonable dimensional and electrical constraints. As a result, it is shown that the latter HEFSM can achieve higher motor efficiency at the low-torque and high-speed region while keeping the motor efficiency at the low-torque and low-speed region. View Full-Text

Keywords: hybrid excitation flux switching motor; automobile traction motor; variable flux motor; variably magnetizable permanent magnet; motor efficiency

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Okada, T.; Kosaka, T.; Matsumori, H.; Matsui, N. Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion. World Electr. Veh. J. 2021, 12, 58. https://doi.org/10.3390/wevj12020058

AMA Style

Okada T, Kosaka T, Matsumori H, Matsui N. Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion. World Electric Vehicle Journal. 2021; 12(2):58. https://doi.org/10.3390/wevj12020058

Chicago/Turabian Style

Okada, Takeshi, Takashi Kosaka, Hiroaki Matsumori, and Nobuyuki Matsui. 2021. "Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion" World Electric Vehicle Journal 12, no. 2: 58. https://doi.org/10.3390/wevj12020058

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Comparative Study on Hybrid Excitation Flux Switching Motors without and with Variably Magnetizable Permanent Magnets for Electrified Vehicle Propulsion

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