Motor driving apparatus and disk apparatus using the same

Details Motor driving apparatus and disk apparatus using the same Motor driving apparatus and disk apparatus using the same

2006-07-11

2006-07-11

Schwartz, Christopher P. (Department: 3683)

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and electric

C318S371000

Reexamination Certificate

active

07073872

ABSTRACT:
A motor driving apparatus includes a position detector for detecting a rotational position of a motor to output the detection result as a position signal, a frequency comparator for comparing frequencies of continuous periods in the position signal and detecting a reversed state in which the frequency of the signal in the later period is higher than the frequency of the signal in the earlier period, a brake change over unit for selecting a reverse torque brake control which applies reverse torque to the rotor for braking or a short brake control which shorts coils of the motor for braking and instructing the brake control. The brake change over unit changes over the brake control from the reverse torque brake control to the short brake control, when a command signal for applying a reverse torque is output and the frequency comparator detects the reversed state.

REFERENCES:
patent: 5982119 (1999-11-01), Okada et al.
patent: 6531839 (2003-03-01), Shin et al.
patent: 6831432 (2004-12-01), Murakami
patent: 2004/0183490 (2004-09-01), Maeda
patent: 6-223489 (1994-08-01), None
patent: 2000-350485 (2000-12-01), None

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