Patents by Inventor Wolfgang M. J. Radziwill

Wolfgang M. J. Radziwill has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Commutation circuit for a collectorless d.c. motor
    Patent number: 4752724
    Abstract: A control circuit for a collectorless d.c. motor, without a commutation sensor, and comprising a stator with a multiphase system and a permanent-magnet rotor. The commutation state of the motor depends on the voltages induced in the stator windings. A comparison signal is generated which indicates whether the sign of that winding voltage which is not connected to a direct current source by means of the circuit electronic switching elements is in conformity with a predetermined sign which depends on the instantaneous commutation state. This comparison signal is inhibited during those time intervals in which transient effects which may cause spurious zero crossings occur in the windings as a result of the electronic switching elements being turned off. The switching elements are always switched one commutation step further if the comparison signal does not have the appropriate sign.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: June 21, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Wolfgang M. J. Radziwill, Gunter Doring