Disc drive spindle motor with programmable current control

Details Disc drive spindle motor with programmable current control Disc drive spindle motor with programmable current control

1997-11-26

2000-01-04

Sircus, Brian

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318434, 318811, 388804, G05B 1128

Patent

active

060113758

ABSTRACT:
A disc drive includes an apparatus for limiting coil energization current to a programmable value. A current sensor is operatively coupled to a coil and provides a signal which is indicative of current flow through the coil. A configurable voltage source is responsive to a control signal. A current inhibitor is operatively coupled to the output of the current sensor and the voltage source such that the current inhibitor selectively inhibits current flow through the coil based on results of a comparison between the current sensor signal and a voltage supplied by the configurable voltage source. A method of calibrating a current control threshold is also provided as well as a method of controlling the coil energization current.

REFERENCES:
patent: 5017855 (1991-05-01), Byers et al.
patent: 5457364 (1995-10-01), Bilotti et al.
patent: 5640943 (1997-06-01), Tasaka et al.
patent: 5786681 (1998-07-01), Kalpathi

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