Control device for salient pole type permanent magnet motor
US5650706A · kind A · utility
27Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | May 23, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A control device for a salient pole type permanent magnet motor. A magnetic flux of a magnet is detected by an arithmetic operation or actual measurement, and a demagnetization rate is calculated in accordance with the thus detected magnetic flux. A target of controlling the phase is calculated with reference to a demagnetization rate obtained by the calculation. The phase of a motor current is controlled depending on the target of control obtained by the calculation. Thus, a torque is prevented from lowering due to demagnetization of the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.