Method and device for controlling a brushless electric motor
US6380707B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2001 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Aug 24, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The brushless electric motor (M) is provided with switching means (Q1-Q6) for selectively supplying current to the armature windings (U, V, W) of the motor (M) from a DC-power supply (1) The switching means (Q1-Q6) are controlled by measuring the back-electromotive forces developed in the windings (U, V, W) during operation and comparing these measurements with a high and low reference voltage, in such a way that each time a measured back-electromotive force with positive slope crosses the high reference voltage or a measured back-electromotive force with negative slope crosses the low reference voltage, a commutation signal is generated to commutate the switching means (Q1-Q6), this provides a highly simplified control of the switching means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.