Patents Assigned to Microcpolis Corporation
  • Stepping motor drive system
    Patent number: 4422113
    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.
    Type: Grant
    Filed: May 12, 1981
    Date of Patent: December 20, 1983
    Assignee: Microcpolis Corporation
    Inventor: Stuart P. Mabon