Patents by Inventor Uwe Varchmin

Uwe Varchmin 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).

  • Method for determining the instantaneous winding temperature of the stator winding of a three-phase AC motor, in particular a pole-changeable asynchronous motor
    Patent number: 6434505
    Abstract: The invention relates to a method for determining the winding temperature (TW) of the stator winding of a three-phase AC motor, in particular a pole-changeable asynchronous motor. For determining the winding temperature (TW) of the stator winding of three-phase AC motors that have an unfavorable ratio of the active power to the dissipation power and react sensitively to temperature changes and changes in a main voltage, and for readily determining the heat dissipation power (PV) from the winding temperature (TW) of the stator winding, it is proposed to determine the reference temperature (TG) and the motor current (IM) simultaneously at consecutive points in time, and to determine the winding temperature (TW) by calculating step-by-step sequentially the change in the winding temperature (TW) at a point in time (tn) and adding this change to the winding temperature (TW) of the immediately preceding point in time (tn−1).
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: August 13, 2002
    Assignee: Atecs Mannesmann AG
    Inventors: Michael Koepke, Eberhard Schröder, Uwe Varchmin