Flexible disk drive device

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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388811, 388910, H02P 5168

Patent

active

052992772

ABSTRACT:
A flexible disk drive device includes an adjusting circuit which sets termination timing of outputting of an index signal in response to the rotating speed of a motor by adjusting charge or discharge time constant of a capacitor; a reference voltage generating circuit which includes a plurality of resistors connected in series between the power source line and the ground line and generates the reference voltage at one of the nodes of the resistor chain; and a reference voltage switching circuit which switches the reference voltage to another reference voltage upon receipt of a speed selection signal which represents a different rotating speed from a predetermined rotating speed, wherein the other reference voltage is so set that the pulse width of the index signal corresponds to a predetermined rotating angle of the motor.

REFERENCES:
patent: 4488096 (1984-12-01), Cap et al.
patent: 4578625 (1986-03-01), Nazarian et al.
patent: 4843288 (1989-06-01), Volz et al.
patent: 4987355 (1991-01-01), Leaper et al.
patent: 5159503 (1992-10-01), Mitamura et al.
patent: 5193146 (1993-03-01), Kohno

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