Brushless motor drive device
US7164245B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 2006 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Jan 24, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless motor drive device has a signal synthesizing circuit for converting a plurality of sensing signals into a plurality of drive signals so as to determine an amplitude of each of the drive signals in accordance with a current error signal. The sensing signals are generated by a sensing circuit in response to variations in a magnetic field of a brushless multi-phase motor. The current error signal is representative of a difference between a current command signal and a motor drive current. The signal synthesizing circuit is characterized by including a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals. The calibrating circuit includes a differential amplifying circuit, a rectifying circuit, a filtering circuit, and a dividing circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.