Hitachi Industrial Equipment Systems Co., Ltd.

Japan Servo Co.,ltd.

Hitachi Powdered Metals Co., Ltd.

Masahide Yamazaki

Ryoso Masaki

Yuji Enomoto

Katsuyuki Yamazaki

Masashi Kitamura

Motoya Ito

Chio Ishihara

Shoji Ohiwa

Yasuaki Motegi

Kazuo Asaka

Akeshi Takahashi

A three-phase permanent magnet brushless motor comprises a stator having three-phase windings, and a rotor having a permanent magnet with a plurality of poles for serving as a field magnet. The stator comprises a stator core which includes a powder core that is compacted at a high density in at least teeth thereof. A combination of the number of magnetic poles of the rotor with the number of slots of the stator satisfies a condition that a least common multiple of the number of slots and the number of magnetic poles is 60 or more in a region in which the number of magnetic poles is 16 or less, and the number of slots is 12 or less. The powder core is made by compacting magnetic powders to have a green density of 7.5 g/cmor higher.

Three-phase permanent magnet brushless motor

Growing community of inventors

Funabashi, Japan

Masahide Yamazaki