Motor and disk drive apparatus

Details Motor and disk drive apparatus Motor and disk drive apparatus

2006-08-22

2006-08-22

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S255000, C318S059000, C318S257000

Reexamination Certificate

active

07095195

ABSTRACT:
In a motor and a disk drive apparatus in accordance with the present invention, a position detecting part30comprises a detection signal switching circuit39A, a noise elimination circuit38and a detection circuit39B, and the detection signal switching circuit39A 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.

REFERENCES:
patent: 5323093 (1994-06-01), Kikuchi
patent: 5886489 (1999-03-01), Rowan et al.
patent: 04222489 (1992-08-01), None
patent: 04312387 (1992-11-01), None
patent: 08223970 (1996-08-01), None
patent: 11004595 (1999-01-01), None

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