Patents Represented by Law Firm McCaulay Fisher Nissen Goldberg & Kiel
  • Patent number: 5010283
    Abstract: A motor control circuit provides reduced stopping time. The circuit utilizes n rotational signals whose relative phase differences are proportional to the rotational speed of the motor. Inverted logic signals are formed of these n signals. Circuitry for discriminating the direction of the motor and for determining from the n signals n-1 and/or n inverted signals, the initial change of any of the signals following a reversal of the motor. Upon determining the initial change, a signal is supplied to the motor drive circuit to cause the motor to de-energized. A specific circuit for holding the motor in a stopped condition is disclosed.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: April 23, 1991
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Kimio Kitajima, Hiroyuki Kiuchi