Brushless motor and disk drive apparatus

Details Brushless motor and disk drive apparatus Brushless motor and disk drive apparatus

2005-10-25

2005-10-25

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

Reexamination Certificate

active

06958877

ABSTRACT:
A brushless motor has first and second power transistors which form current paths to three-phase windings so as to rotate a rotor. A position detecting part produces a position signal in response to a rotation of the rotor. An activation operation block controls active operation of the first and second power transistors in response to the position signal. The activation operation block includes a starting operation part which comprises an initial phase setting part, phase changing part and a phase correcting part. The initial phase setting part sets an initial phase of drive signals to the three-phase windings in response to the level of the position signal at the timing of a start signal. The phase changing part changes sequentially the phase of the drive signals to the three-phase windings in the positive direction in response to time. The phase correcting part corrects the phase of the drive signals to the three-phase windings in response to the occurrence of the rising and falling edges of the position signal. Therefore, the brushless motor with reduced position sensor can stably start the rotation of the rotor by using one position signal of one position sensor.

REFERENCES:
patent: 4535276 (1985-08-01), Yokobori
patent: 5473232 (1995-12-01), Tamaki et al.
patent: 5661382 (1997-08-01), Enami et al.
patent: 5729102 (1998-03-01), Gotou et al.
patent: 5798623 (1998-08-01), El-Sadi
patent: 5959418 (1999-09-01), Gotou
patent: 5982118 (1999-11-01), Gotou et al.
patent: 6255789 (2001-07-01), Ochi et al.

Affiliated with

Also associated with

Rating

Brushless motor and disk drive apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Brushless motor and disk drive apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brushless motor and disk drive apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3440363