Patents Assigned to Advanced Motion Controls, Inc.
  • Speed control for brushless DC motors
    Patent number: 5995710
    Abstract: An apparatus for controlling the speed of rotation of the rotor of a brushless DC motor wherein means are provided for shifting both the on and off angle of motor excitation in opposite senses to thereby widen or narrow the pulse of energization to motor winding(s).
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: November 30, 1999
    Assignee: Advanced Motion Controls, Inc.
    Inventors: George H. Holling, Mark Yeck, Michael Schmitt
  • Sensorless commutation position detection for brushless D.C. motors
    Patent number: 5990643
    Abstract: A rotor position determination system for a polyphase D.C. brushless motor utilizing the back electromotive force (B.E.M.F.) voltage of the open or "off" phase of the motor as a critical signal for controlling the commutation of the motor, the system further including means for phase advance of the energization of the motor.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: November 23, 1999
    Assignee: Advanced Motion Controls, Inc.
    Inventors: George H. Holling, Mark Yeck, Michael Schmitt
  • Commutation position detection system and method
    Patent number: 5821713
    Abstract: An improved commutation position detection system for accurately determining commutation position within polyphase brushless motors without employing proximity sensors or transducers. The present invention determines commutation position. by differentiating the current flowing within the stator coils and comparing the differentiated current waveforms to one another (absolute commutation position detection) or a predetermined threshold (incremental commutation position detection) to obtain a real-time assessment of commutation position.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: October 13, 1998
    Assignee: Advanced Motion Controls, Inc.
    Inventors: George Holling, Mark Yeck, Michael Schmitt