Control unit for an electric machine

摘要

A control unit for an electric machine. The control unit has a processing unit and a power output stage connected to the processing unit. The power output stage is connected to outputs of the control unit for stator coils of a stator of the electric machine. The processing unit is designed to supply current to the power output stage for generating a stator field, in particular a rotating magnetic field. The control unit comprises an electrical energy store, in particular an intermediate circuit capacitor or accumulator, connected to the power output stage. The control unit includes an input for a control signal, for example a temperature signal. The processing unit is preferably designed to actuate the power output stage as a function of the temperature signal such that the energy store can be heated by a current application pattern generated by the power output stage. The current application pattern corresponds to a stator field which cannot generate an effective torque or a rotary motion, such as a full revolution of a rotor of the electric machine.

主权项

1. A control unit for an electric machine, the control unit comprising:
a processing unit; a power output stage connected to the processing unit, wherein the power output stage is connected to an output for stator coils of a stator of the electric machine and the processing unit is designed to supply current to the power output stage for generating a stator field; an electrical energy store connected to the power output stage, wherein; an input for a temperature signal; and a temperature sensor which is connected to the energy store and is designed and disposed to acquire a temperature of the energy store and to generate a temperature signal corresponding to the temperature, wherein the processing unit is designed to actuate the power output stage as a function of the temperature signal such that the energy store can be heated by a current application pattern generated by the power output stage and the current application pattern corresponds to a field which cannot generate a full revolution of a rotor of the electric machine, wherein the temperature sensor is designed to detect voltage transients of a voltage dropping across the energy store and to generate the temperature signal as a function of the voltage of the voltage transients.