Patents Assigned to Woel Elektronik HB
  • Circuit for speed control for a one-phase or three-phase motor
    Patent number: 5953490
    Abstract: The circuit for speed regulation of a three-phase motor incorporates a drive connected directly to a three-phase mains (R,S,T) which allows through mains voltage directly to the motor windings controlled by a pulse-width modulated signal produced by a control circuit controlled by the motor speed and fed to the drive stage via circuits for galvanic (d.c.) separation of the control circuit and the drive stage. The galvanic separation is produced with solar cell components.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: September 14, 1999
    Assignee: Woel Elektronik HB
    Inventors: Gunnar Wiklund, H.ang.kan Ohrnell