Patents Examined by Herman J. Hohausser
  • Stepping motor drive method and apparatus
    Patent number: 4140955
    Abstract: A driver circuit for controlling the excitation of a multi-phase stepping motor is described which includes a switching power supply providing two average power output levels. The switching power supply provides a high voltage at the initiation of each excitation of a motor winding and a modulated voltage having an average at the normal operating level. The driver according to the invention eliminates need for dual power supplies and damper resistors.
    Type: Grant
    Filed: May 12, 1977
    Date of Patent: February 20, 1979
    Assignee: Fluke Trendar Corporation
    Inventor: Richard B. Drabing