Control device equipped with motor protection function
US7612513B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2007 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Dec 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H6/005
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A synchronous motor control device having an optimal protection function in accordance with an operational state of a motor is provided.The motor control device includes a position detecting sensor detecting an angular position of a motor, a speed controller controlling the speed of the motor based on the angular position of the motor detected by the position detecting sensor, a temperature estimation component that estimates the temperature of the motor from a current command value calculated by the speed controller or a torque command value and, when the estimated temperature reaches a threshold, outputs a current cutoff signal to a current controller that cuts off passage of current to the motor, and an operational state determination part determining an operational state of the motor based on the angular position of the motor detected by the position detecting sensor, wherein the temperature estimation component changes the threshold based on the operational state of the motor determined by the operational state determination component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.