Ebm-papst Mulfingen Gmbh & Co Kg

Philip Kemmet

Ralph Wystup

A fan heater () has a motor (M) with motor windings (W) and a rotor that is connected to a fan (V) for delivering ambient air at least partially along the motor windings (W). At least one motor winding is configured as a heater winding (HW) for generating a specific heat output or amount of heat as intended.

Fan heater motor

The present invention relates to a device for ascertaining the temperature TW of a winding of an induction machine designed with a stator and a rotor, comprising at least a first Kalman filter (K) to calculate the temperature and a rotary field control for the vector control of the induction machine with at least one id-current controller, which is designed to impose a high-frequency voltage signal (HF) on the winding voltage in order to obtain from this a winding current with a superimposed high-frequency current component for the winding, which is taken to the Kalman filter (K), the Kalman filter (K) having a high-frequency model of the motor in order to determine from this the high-frequency resistance of the winding and in turn the winding temperature TW by means of a calculation function.

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Heilbronn, Germany

Philip Kemmet