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Development of a Compact, Highly Efficient Traction Motor for Fuel Cell and Electric Vehicles

Article of Honda R&D Technical Review Vol.12 No.2


This paper describes the development of a compact, high-efficiency and high-power traction permanent magnet motor utilizing reluctance torque for electric vehicles.
The “Salient SPM” motor has salient between adjoining permanent magnets exposed on the rotor surface. This structure enabled magnet weight reduction by 35% compared with the interior permanent magnet (IPM) motor which generated equivalent torque.
Insulation between magnet and rotor yoke reduced the eddy current loss by up to 1 kW compared with a non-insulated motor.
As a result, maximum torque of 238 Nm and maximum power of 60 kW were obtained with this motor. The motor gave power density of 1.8 kW/kg, and torque density of 7 Nm/kg. At the same time, the overall motor-inverter efficiency reached 93% average drive efficiency when running in UDDS mode.


(1) K. Yamamoto, S. Akutsu, K. Takizawa, Y. Saito, “Development of a Propulsion Motor the “Honda EV Plus”, HONDA R&D Technical Review, Vol.10, p.24-31 (1998) [paper](Written in Japanese)
(2) “Control Actuator Drive System Investigation Committee: Control Actuator Drive System”, Technical Report of IEE Japan No.614, (1996) [report] (Written in Japanese)
(3) T. Miura, Y. Kawabata, E. Yamada, “Development of Motor for Electric Vehicles” EVS-13 Conference proceeding, Osaka, Japan, No.II, p.57-63 (1996) [paper]
(4) S. Morimoto, T. Ueno, Y. Takeda, “Wide Speed Control of Interior Permanent Magnet Synchronous Motor” Trans. of IEE Japan, Vol.114-D, No.6, p.668-673 (1994) [paper] (Written in Japanese)

Author (organization or company)

Kazuaki TAKIZAWA(Tochigi R&D Center)、Tomoyuki ITOH(Tochigi R&D Center)、Hiroyuki SATOH(Tochigi R&D Center)

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