Method for determining the operating temperature of a motor, particularly for actuating a functional element such as a parking brake driven by an electric motor in a vehicle, and for reversing the polarity of its motor current

摘要

The method involves adjusting predetermined and operating temperature depending cut-off current (imax) according to a desired load torque (Mmax) of a rotor (12). An operating temperature (T) of a commutator-direct current motor (13) is determined from measuring current by a temperature dependent conductor (26) during standstill condition of the rotor. The temperature dependent conductor is parallel-connected to rotor coils (24) at a commutator (25). The measuring current is determined from voltage drop over a short circuit protective resistor (33).