Matsushita Electric Industrial Co., Ltd.

Yukitoshi Wada

Hiroshi Murakami

Yoshinari Asano

Yukio Honda

Shizuka Yokote

Hideo Hirose

Yasuaki Matsushita

Mikio Hirano

Manabu Takeuchi

Yoshikazu Kinashi

The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrated windings with the following structure so that permanent magnet () is hard to subjected to demagnetization magnetic field: 0.3 Lg&#x3c;La&#x2266;2.0 Lg, where La is a clearance between teeth of stator (), and Lg is an air-gap between stator () and rotor (). Outer walls of both ends of the permanent magnet () disposed within rotor () in a rim direction may be tapered toward inside from a rotor rim in a radial direction and to form a recessed section on the outer walls of the magnets. As a result, withstanding force against demagnetization is expected to increase.

Permanent magnet synchronous motor including permanent magnet with tapered outer edges and rotor core with opening

Permanent magnet synchronous motor including permanent magnet with tapered outer edges

Permanent magnet synchronous motor

The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrating windings with the following structure so that permanent magnet () is hard to subjected to demagnetization magnetic field: 0.3 Lg&#x3c;La&#x2266;2.0 Lg, where La is a clearance between teeth of stator (), and Lg is an air-gap between stator () and rotor (), and yet outer walls of both ends of the permanent magnet () disposed within rotor () in a rim direction are tapered toward inside from a rotor rim in a radial direction and thus form recessed section on the outer walls of the magnets. As a result, withstanding force against demagnetization is expected to increase.

A stator of a dynamo-electric machine includes core pieces obtained by laminating iron plates divided in a circumferential direction per pole-tooth unit and having projecting and recessed engaging parts at their dividing faces, and then welding the iron plates by laser at their inner and outer peripheries. A winding part is formed around each pole-tooth unit of the core pieces. A predetermined number of the core pieces are bonded into the loop, with the projecting and recessed engaging parts engaged with each other and rigidly welded at outer peripheries of bonding faces by laser in a laminating direction.

Stator of dynamo-electric machine

Growing community of inventors

Osaka, Japan

Yukitoshi Wada