Circuit for generating a dual purpose control signal in a disk a

Details Circuit for generating a dual purpose control signal in a disk a Circuit for generating a dual purpose control signal in a disk a

1988-10-26

1990-04-17

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388908, 388815, 360 7303, G05B 500

Patent

active

049187430

ABSTRACT:
A magnetic or optical disk apparatus featuring a circuit for generating a dual implication MOTOR STATUS signal in response to a MOTOR SPEED signal representative of the speed of rotation of a disk drive motor and to a MOTOR ON signal dictating the rotation and nonrotation of the disk drive motor. The MOTOR STATUS signal indicates: (1) the rotation of the disk drive motor at a desired normal speed, enabling data transfer between the disk and a head; and (2) the slowing down of the motor to a predetermined speed close to zero. The two implications of the MOTOR STATUS signal can be distinguished from each other by reference to the MOTOR ON signal. The first implication may be used to enable reading or writing of data on the disk, and the second implication for disk ejection and for opening a power switch or switches, among other purposes.

REFERENCES:
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patent: 4736263 (1988-04-01), Takahashi et al.
patent: 4739230 (1986-11-01), Sonobe et al.
patent: 4789975 (1988-12-01), Taniyama

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