Patents Assigned to Gottfried Gutsche
  • Patent number: 5764021
    Abstract: A method and device are disclosed for speed control of an AC induction motor by means of a control circuit which generate a motor drive voltage consisting of a combination of AC and time-spaced DC pulses. During the occurrence of the time-spaced DC pulses in the motor's AC drive voltage a back EMF suppression network is activated to absorb the motor's generated back EMF energy. A further feature of the invention is a slow down mode where the motor is decelerated from continuous full cycle AC to a requested slow speed setting by means of a higher contend of DC pulses in the AC drive voltage.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: June 9, 1998
    Assignee: Gottfried Gutsche
    Inventor: Gottfried Juergen Gutsche