Permanent magnet brushless motor
US9762109B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2015 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Oct 13, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet brushless motor has a stator and a rotor. The stator has a yoke and s teeth extending from the yoke, forming a stator core, where s is an integer greater than four. Coils of a stator winding are wound about the teeth. The rotor has a shaft, a rotor core fixed to the shaft and a permanent magnet mounted to the rotor core. The permanent magnet forms p magnetic poles, where p is an even number greater than 2 but less than s. Each section of the permanent magnet corresponding to a respective magnetic pole is divided into n equal parts by n−1 magnet grooves, where n is an integer greater than 1 and p*n is an integral multiple of s. The magnet grooves significantly increase the detent torque of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.