Rotary position sensing during rotor acceleration in an electric motor
US6369541B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/21
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spin up procedure for use with a DC brushless motor uses a variable rotor position sampling interval during the early stages of rotor acceleration. Prior to applying a drive current to the motor, the present position of the rotor with respect to the stator is sensed. Once the initial rotor position is known, a selected drive current state is applied to the stator coil windings to initiate motion of the rotor. While the rotor accelerates, rotor position samples are repeatedly taken to provide the needed position feedback for commutation purposes. The rotor position samples are taken using a decreasing sampling interval during the rotor acceleration phase. Preferably, the rotor position update rate roughly tracks the increasing rotational velocity of the rotor during the spin up operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.