Methods and systems for controlling electric motors
US11165375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2020 |
| Grant date | Nov 2, 2021 |
| Priority date | — |
| Expiry date | May 20, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/183
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided a method of controlling an electric motor having a rotor and a stator. The method includes controlling the motor in a low-speed mode by injecting a high frequency (HF) signal into the motor. The HF signal may have an initial voltage and an initial frequency. The method may also include obtaining a speed of the rotor relative to the stator, and obtaining a reference input being sent to the motor. Moreover, the method may include comparing the speed and the reference input with a speed threshold and a reference input threshold respectively. In addition, the method may include reducing at least one of the initial voltage and the initial frequency if the speed is below the speed threshold and the reference input is below the reference input threshold, to reduce an acoustic noise caused by injecting the HF signal into the electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.