Motor winding overheat prevention apparatus and motor control apparatus
US8723469B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2012 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Aug 18, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A winding overheat prevention apparatus comprises: a stator winding temperature calculation unit which calculates winding temperature based on the ambient temperature of the motor and on the amount of change in the estimated temperature of a stator winding; a position sensor temperature detection unit which detects the temperature indicated by a temperature sensing element in a position sensor a rotor; and an alarm signal output unit which outputs an alarm signal when the winding temperature exceeds an alarm level, wherein when the ambient temperature is not higher than a prescribed temperature, the alarm level is set equal to a temperature preset based on the ambient temperature and the maximum value of the amount of the temperature change, while when the ambient temperature is higher than the prescribed temperature, the alarm level is set equal to a temperature preset in order to protect the position sensor from overheating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.