Stepping motor drive system

Details Stepping motor drive system Stepping motor drive system

1981-05-12

1983-12-20

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

310 49R, G11B 2108

Patent

active

044221134

ABSTRACT:
The track-to-track access time of a floppy disk memory drive unit may be decreased in an inexpensive manner by operating a simple four phase permanent magnet stepper motor as a two phase brushless D.C. motor during track-to-track, high speed or "slewing" action. Included in the system are (1) single phase holding for increased accuracy, (2) sensing for two phase motor synchronization with one of the unused phase coils, and (3) speed control limiting by pulse width braking action.

REFERENCES:
patent: 3737883 (1973-06-01), Sordello et al.
patent: 3972535 (1976-08-01), Bleiman
patent: 4048531 (1977-09-01), Buess et al.
patent: 4359763 (1982-11-01), Hoffman

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