Constant current driving system for a stepper motor in rotating

Details Constant current driving system for a stepper motor in rotating Constant current driving system for a stepper motor in rotating

1992-07-07

1993-11-09

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

388811, 388819, 388915, 361 23, 361 28, 361 29, H02P 800

Patent

active

052606341

ABSTRACT:
In order to drive the stepper motor of a floppy disk drive with practically constant current in the face of fluctuations in supply voltage fed from a host system, a power control pulse generator circuit is provided which produces a series of power control pulses having a duty ratio dependent upon fluctuating supply voltage. The power control pulses are used for interrupting the excitation of the stepper motor windings during track seek operation. The power control pulses are generated by first repeatedly counting clock pulses from the host system to a predetermined number to provide periodically varying digital data, then translating the digital data into a triangular wave having an amplitude dependent upon the supply voltage, and then comparing the triangular wave with a reference voltage.

REFERENCES:
patent: 4677359 (1987-06-01), Enami et al.
patent: 4871952 (1989-10-01), Ishizaka et al.
patent: 4949393 (1990-08-01), Ohmori et al.
patent: 5017854 (1991-05-01), Gully et al.

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