Motor driving apparatus, motor driving method and disk driving apparatus
US7667419B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2007 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Mar 20, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor driving apparatus includes a virtual difference voltage detecting unit operable to detect a difference voltage between a virtual neutral point of a resistor circuit connected in parallel to motor coils and a terminal of a motor coil in non-conduction state, a rotor position detecting unit operable to detect a position of the rotor based on the difference voltage, and a controller operable to control commutation of an inverter based on the rotor position. The motor driving apparatus has a searching start mode for detecting the rotor position and energizes the coils, and a back electromotive voltage feedback mode for controlling commutation based on the back electromotive voltage. In the searching start mode, a rotor position searching process and a rotation start torque applying process are alternately performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.