Effect of Magnetic Properties of Magnetic Composite Tapes on Motor Losses

Ryo Yoshida, Jun Kitajima, Takashi Sakae, Mitsuhide Sato, Tsutomu Mizuno, Yuki Shimoda, Akihiro Kubota, Shogo Wada, Teruo Kichiji and Hideo Kumagai
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Ryo Yoshida: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan
Jun Kitajima: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan
Takashi Sakae: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan
Mitsuhide Sato: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan
Tsutomu Mizuno: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan
Yuki Shimoda: TAMAGAWA Seiki Co., Ltd., Nagano 395-0068, Japan
Akihiro Kubota: TAMAGAWA Seiki Co., Ltd., Nagano 395-0068, Japan
Shogo Wada: TAMAGAWA Seiki Co., Ltd., Nagano 395-0068, Japan
Teruo Kichiji: TAMAGAWA Seiki Co., Ltd., Nagano 395-0068, Japan
Hideo Kumagai: TAMAGAWA Seiki Co., Ltd., Nagano 395-0068, Japan

Energies, 2022, vol. 15, issue 21, 1-16

Abstract: Alternating current (AC) copper losses in motors increase with carrier frequency of the pulse width modulation (PWM) and are further increased by leakage flux of the permanent magnet. Therefore, AC copper losses increase with motor speed. Conventional techniques for reducing AC copper losses tend to increase other losses. In this paper, AC copper loss was reduced by wrapping a magnetic tape made of a magnetic composite material around the winding. This method controlled the flux path through the winding. Magnetic composite materials are mixtures of magnetic powders and liquid resins whose magnetic properties can be manipulated by changing the combination and other factors. When Fe–Si–Al magnetic tape was wrapped around the winding, the AC copper loss was reduced by 40%. The loss was further reduced by optimizing the magnetic properties of the magnetic composite material. The AC copper loss was maximally reduced when the specific permeability was 100 and the saturation flux density was 1.6. Magnetic tapes composed of magnetic composite materials with high saturation flux density and specific permeability reduce the AC copper losses without increasing other losses in the motor.

Keywords: alternating current copper loss; drone; magnetic composite material; magnetic tape; outer rotor motor; winding (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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