Patents Assigned to Compumotor Corporation
  • Method and means for stable operation of a synchronous motor
    Patent number: 4455520
    Abstract: Stability in operating a synchronous stepping motor in mid-frequency is achieved by monitoring instantaneous power to the motor and adjusting the phase of the motor drive waveform as needed to maintain uniform speed. In an embodiment in which a pulse width modulator responds to a reference signal waveform, the phase of the reference signal waveform is varied to adjust the instantaneous power delivered to the motor.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: June 19, 1984
    Assignee: Compumotor Corporation
    Inventors: Kenneth C. Ward, Ross Welburn
  • Synchronous motor having gradual edge effect
    Patent number: 4385250
    Abstract: A synchronous motor has a gradual edge effect as rotor teeth align with stator teeth by varying the width of the stator teeth. The edges of uniformly spaced rotor teeth of equal width will align with edges of the widest stator teeth before aligning with the edges of the narrower stator teeth. The change in torque associated with edge alignment of the rotor and stator teeth is spread in time and position with less compounding of the changing torque. More uniform torque and smoother, quieter motor operation results.
    Type: Grant
    Filed: January 12, 1981
    Date of Patent: May 24, 1983
    Assignee: Compumotor Corporation
    Inventor: Ross D. Welburn