Floppy disk drive with PWM control

Details Floppy disk drive with PWM control Floppy disk drive with PWM control

1994-09-13

2000-11-14

Loomis, Paul

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 69, G11B 5596

Patent

active

061478326

ABSTRACT:
A floppy disk drive has an exciting current supplying circuit and a control circuit for controlling the exciting current supplying circuit so that the exciting current is increased to a first predetermined value, reduced to a second predetermined value and then decreased to zero or raised to a third predetermined value. This arrangement has the effect of suppressing the counter electromotive force induced by the self induction of the motor coil, reducing noises on a power line and thereby preventing irregular rotation of the stepping motor.

REFERENCES:
patent: 4600868 (1986-07-01), Bryant
patent: 4691153 (1987-09-01), Nishimura
patent: 5084661 (1992-01-01), Tanaka
patent: 5117171 (1992-05-01), Bonss
patent: 5402052 (1995-03-01), Cheng et al.
patent: 5485070 (1996-01-01), Tominaga
Principles of Power Electronics, Kassakian et al., 1991, pp. 182-186.

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