Apparatus for estimating rotor position of brushless motors and system and method for controlling start-up of brushless motors
US8072165B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 20, 2009 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Jul 21, 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 even though power source voltage fluctuates is provided. First, the power source voltage is detected, and voltage is supplied only for a certain period of time and a current response is detected. The current detection value is multiplied by the ratio of a reference voltage to the power source voltage detected to correct the current detection value. Specifically, the peak current detection value is corrected upwardly or downwardly in each direction. A voltage supplying direction in which the current detection value is maximized is searched for to estimate the rotor position and a brushless motor is started.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.