System and method for establishing spindle motor current...

Details System and method for establishing spindle motor current... System and method for establishing spindle motor current...

2007-11-06

2007-11-06

Masih, Karen (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000, C318S729000, C318S812000

Reexamination Certificate

active

11344326

ABSTRACT:
When a HDD is operating at a temperature below a threshold, a partial sine wave is input to the spindle motor to activate the motor to reduce undesirable speed oscillations of the motor. At normal operating temperatures a full sine wave is input for noise reduction.

REFERENCES:
patent: 4034274 (1977-07-01), Akima
patent: 4242625 (1980-12-01), Hedges
patent: 4636702 (1987-01-01), Hedges
patent: 5569988 (1996-10-01), Kokami et al.
patent: 2004/0108827 (2004-06-01), Kusaka et al.

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