Patents Assigned to Zen Zen Electric Company Ltd.
  • Commutation circuit for a brushless D.C. Motor
    Patent number: 5200675
    Abstract: A commutation circuit for a brushless D.C. motor which circuit maximizes motor torque and motor efficiency for all ranges of motor load and speed, regardless of the connecting and conducting method of the phase coil, by optimizing the commutation pulses from the commutation encoder of the motor. Optimization is accomplished by advancing the commutation pulses to an angle corresponding to the inverse tangent function of the motor velocity and the load current, and by optimizing the commutation pulse width.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: April 6, 1993
    Assignee: Zen Zen Electric Company Ltd.
    Inventor: Kwangjoon Woo