Method for controlling an asynchronous slipring-rotor motor, and a device for carrying out the method

摘要

The slipring rotor (2) of the asynchronous slipring rotor motor (1) is connected to a thyristor current controller (9) in order to control the torque and/or the rotation speed. The thyristor current controller (9) is controlled via a comparison circuit (7) and a control-pulse former (8) as a function of the voltage and of the rotation speed or the slip of the slipring rotor (2), and of a required voltage which is predetermined by a rotation-speed setting device (6). The comparison circuit (7) is additionally supplied with a sawtooth-wave form voltage from a sawtooth-wave form voltage former (4) which is synchronised to the frequency of the voltage of the slipring rotor (2) and extends over half a cycle of this voltage. The method is suitable for continuous adjustment of the torque even while the motor (1) is stationary, and for continuous control of its rotation speed. <IMAGE>