Motor and disk drive apparatus
US7095195B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2004 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Jul 5, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/2054
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a motor and a disk drive apparatus in accordance with the present invention, a position detecting part 30 comprises a detection signal switching circuit 39A, a noise elimination circuit 38 and a detection circuit 39B, and the detection signal switching circuit 39A is configured to output an inverted detection signal obtained by logically inverting a detection signal until the rotation speed reaches a predetermined rotation speed after the beginning of starting or until a position detection pulse signal FG is detected a predetermined number of times; position detection operation is carried out only during the ON operation of PWM, whereby PWM sensorless starting is carried out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.