Honda Giken Kogyo Kabushiki Kaisha

Shin-Etsu Chemical Co., Ltd.

Yoshito Harui

Shoji Motodate

Nobuaki Komuro

Teruaki Tobita

Kouji Miyata

Yukihiro Matsui

The invention relates to an improvement in the design of the magnetic circuit in a permanent-magnet rotary machine, e.g., a servomotor, with an object to stabilize the output of the motor with respect to temperature variation. The inventive improvement is in making the value of (A.sub.m B.sub.m)/(A.sub.y B.sub.ys), which is called the area factor .alpha., larger than 1 but smaller than 5, A.sub.m and B.sub.m being the cross sectional area and magnetic flux density, respectively, in the magnetic circuit of the permanent magnet and A.sub.y and B.sub.ys being the effective cross sectional area and saturation magnetic flux density at room temperature, respectively, in the magnetic circuit of the yoke.

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Saitama, Japan

Yoshito Harui