Control device of AC motor
US9077273B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2014 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Mar 6, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control device of a three phase AC motor includes: an inverter for driving the motor; a current sensor for sensing current flowing in a sensor phase of the motor; and a controller for switching multiple switching elements in the inverter to control the current of the motor. An electric angle is defined as θe based on one phase. A phase is defined as φ based on a dq axis. A phase angle of a current command vector is defined as (θe+φ+C). When the motor is stopped, the controller determines whether the current command vector is orthogonal to an axis of the sensor phase. When the current command vector is orthogonal to the axis of the sensor phase, the controller operates the phase or the electric angle to set the current command vector not to be orthogonal to the axis of the sensor phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.