Motor design for reducing cogging torque and torque ripple while maintaining efficiency
US9502928B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2011 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Jan 14, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor of this invention comprises a rotor having a permanent magnet, the number of which magnet poles is P, and a stator including M pcs of teeth, the teeth arranged in a circumferential direction in a manner to face the permanent magnet through a spatial gap, wherein the stator includes stator core having the number M of the teeth, and a winding wire wound about each of the tooth, wherein the number P of the magnet poles and the number M of the teeth have a relation defined by formulae (2/3)M<P<(4/3)M, and M≠P, and wherein ratio (t1/Ds) of teeth tip width t1 to stator inside diameter Ds is given by a formula 0.18<(t1/Ds)<0.25.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.