Electric motor control strategies for using a low resolution position sensor
US7567047B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2004 |
| Grant date | Jul 28, 2009 |
| Priority date | — |
| Expiry date | Feb 13, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor control strategy includes using a low resolution position sensor that provides a square wave output signal. The position sensor information is converted into sinusoidal commutation signals for motor control that reduces torque ripple. In one disclosed example, square wave commutation is used at low motor speeds and a controller switches to sinusoidal commutation once a selected threshold speed of the motor is reached. In another disclosed example, sinusoidal commutation is used at all motor speeds with two different techniques for converting the square wave sensor signal into a sinusoidal commutation signal, depending on the motor speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.