Delta Electronics, Inc.

Li-Jian Wu

Wen-Shi Huang

Shih-Ming Huang

Wan-Bing Jin

Jian-Ping Ying

Jian-Ping Yang

A method for testing a motor having a rotor and a winding is provided. The method includes steps of (a) providing a power to rotate the rotor to a predetermined speed, (b) removing the power, (c) measuring a terminal voltage of the winding while a current within the winding is zero, (d) obtaining a back electromotive force in the winding by compensating the terminal voltage with a performance of the rotor, (e) selecting a characteristic of the back electromotive force and (f) determining a magnetization of the motor by comparing the characteristic with a predetermined parameter.

Method and circuit for testing motor

A rotary structure of a permanent magnet electric machine including a stator and a rotor is provided. The stator has K salient teeth peripherally spaced with equal intervals for forming K winding slots, wherein K is a natural number greater than 1. The rotor has an annular inner surface and has P pairs of permanent magnets peripherally spaced with equal intervals along the inner surface for rotating around the stator, wherein P is a natural number. Each permanent magnet having two sides along a peripheral direction of the rotor includes a pair of inclined surfaces on the two sides, the pair of inclined surfaces is symmetric with respect to a radial plane of the each permanent magnet, and an inclined angle &#x3b1; between the inclined surface and the radial plane is selected from a range of 90(1&#x2212;1/(4P))&#x3c;&#x3b1;&#x3c;90(1+1/(4P)).

Growing community of inventors

Shanghai, China

Li-Jian Wu