Stepping motor control apparatus

Details Stepping motor control apparatus Stepping motor control apparatus

1985-05-06

1987-04-28

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

046617558

ABSTRACT:
A stepping motor control apparatus comprises two switching circuits and a control circuit. The first switching circuit stops the supply of excitation voltage to a stepping motor of a floppy disk drive when the disk drive is in standby state. The second switching circuit applies a high excitation voltage to rotate the motor after the disk drive has come out of the standby state, and applies a low excitation voltage while the motor is ready to rotate after the disk drive has come out of the standby state. The control circuit controls the second switching cirucit such that the high voltage is applied to the stepping motor until the floppy disc drive becomes able to correctly position a magnetic head after it has come out of the standby state.

REFERENCES:
patent: 3893012 (1975-07-01), Lin
patent: 3903467 (1975-09-01), Eckardt
patent: 4035708 (1977-07-01), Schaff
patent: 4142140 (1979-02-01), Wiesner
patent: 4147968 (1979-04-01), Goble

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