| 摘要 |
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.
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