Motor controller with hall sensor output misalignment compensation using delayed or shifted commutation
US8058826B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2008 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Dec 6, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a normal operating mode, a motor controller provides motor drive current to windings of a motor based on sensor signals to drive the windings in a normal commutation sequence, and monitors for occurrence of a motor stall condition. Upon detecting the motor stall condition in a given commutation state, then in a first driving step, the windings are momentarily driven according to an advanced commutation state, and during the first driving step, a reverse transition of the sensor signals to a state corresponding to a preceding commutation state is detected. Upon completion of the first driving step when such a reverse transition of the sensor signals is detected, then in a second driving step the windings are driven according to the preceding commutation state until a forward transition of the sensor signals is detected, and in a third driving step the windings are momentarily continued to be driven according to the same commutation state notwithstanding the forward transition of the sensor signals before normal operation is resumed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.