Motor controller and method of controlling motor
US6037741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1999 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Apr 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/185
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When there is a change in required torque, the prior art technique may cause the undesirably low accuracy in the sensor-free determination of the electrical angle. A motor controller of the present invention has the following configuration to control the operation of a synchronous motor, in which multi-phase alternating currents flow through coils to rotate a rotor. The motor controller includes an electrical angle determination unit, which applies a voltage for determination to the coils and determines the electrical angle of the rotor in a sensor-free manner, based on the electric currents flowing in response to the applied voltage for determination. The motor controller also has a torque control unit that applies a voltage for torque output to the coils, corresponding to the required torque. An adjustment unit included in the motor controller adjusts the execution timings of the electrical angle determination unit and the torque control unit, so as to prevent the variation in electric current by the torque control unit from affecting the execution of the electrical angle determination unit. One possible procedure schedules the execution timings of the electrical angle determinat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.