Circuit and method for modulating the commutation frequency of a

Details Circuit and method for modulating the commutation frequency of a Circuit and method for modulating the commutation frequency of a

1997-05-28

2000-02-22

Salata, Jonathan

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318254, G05B 102

Patent

active

060284110

ABSTRACT:
A motor control circuit controls a motor in a disc drive. The motor control circuit includes a voltage controlled oscillator (VCO) providing a commutation timing signal. A commutation circuit is operably coupled to the VCO and provides commutation signals to the motor based on the commutation timing signal. A phase locked feedback circuit is operably coupled to the commutation circuit and provides a feedback signal to the VCO based on a sensed commutation phase to control a frequency of the commutation timing signal. A modulator is operably coupled to the phase locked feedback circuit and modulates the feedback signal. A method is also provided in which the commutation timing signal is modulated so as to spread a frequency spectrum of the commutation signals.

REFERENCES:
patent: 4123692 (1978-10-01), Gilmore et al.
patent: 4308508 (1981-12-01), Sommer et al.
patent: 4947093 (1990-08-01), Dunstan et al.
patent: 5530326 (1996-06-01), Galvin et al.
patent: 5744928 (1998-04-01), Tang et al.

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