Apparatus for estimating rotor position of brushless motors and system and method for controlling start-up of brushless motors
US8054017B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 20, 2009 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Jul 7, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/21
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for estimating rotor position for brushless motors capable of accurately estimating rotor position is provided. The apparatus may be used as a start-up system for brushless motors. The apparatus performs accurate estimation even though power source voltage fluctuates, and is able to provide compact configuration. The apparatus supplies voltage to the coils respectively. In each supplying period, the apparatus counts voltage supply period of time until current value reaches to a current threshold value. Since a coil indicative of rotor stop position is prone to be magnetically saturated. The apparatus estimates the rotor stop position based on the voltage supply periods. Then, the apparatus starts a switching sequence based on the rotor stop position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.