Electronic index pulse generating system for speed control in ro

Details Electronic index pulse generating system for speed control in ro Electronic index pulse generating system for speed control in ro

1994-06-23

1995-03-21

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 7301, 360 9908, 360 9904, 318254, 32420725, G11B 1924

Patent

active

054001919

ABSTRACT:
An index pulse generating system utilizes two periodic motor speed signals, one generated by a speed sensor coil actuated upon by a permanent magnet rotor mounted to a turntable, and the other generated by one of magnetoelectric converters acted upon by another permanent magnet rotor mounted to the turntable as a part of a disk drive motor. The two motor speed signals are translated respectively into two series of discrete motor speed pulses. One of the two series of motor speed pulses are produced at rates of two different predetermined numbers per complete revolution of the turntable. The two predetermined numbers have no common measure so that an AND gate or the like inputting the two series of motor speed pulses puts out at least one pulse during each turntable revolution, with the output pulse being representative of a specific angular position of the turntable.

REFERENCES:
patent: 4445157 (1984-04-01), Takahashi
patent: 4746862 (1988-05-01), Ueki
patent: 4758915 (1988-07-01), Sakaguchi
patent: 5036264 (1991-07-01), Ueki
patent: 5038240 (1991-08-01), Isomura
patent: 5041769 (1991-08-01), Iwai
patent: 5313338 (1994-05-01), Ichikawa et al.

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