METHOD FOR THE CONTROLLED APPLICATION OF A STATOR-CURRENT TARGET VALUE AND A TORQUE TARGET VALUE FOR A POLYPHASE MACHINE THAT IS SUPPLIED BY AN ELECTRONIC POWER CONVERTER

摘要

The invention relates to a method for the controlled application of a stator-current target value (ISsoll) and a torque target value (Msoll) for a polyphase machine (4) that is supplied by an electronic power converter. According to the invention: current components (ISdsoll, ISqsoll) in a co-ordinate system (d, q) with a fixed rotor flux or rotating magnetic pole are calculated in accordance with a torque target value and in asynchronous machines in accordance with a rotor-flux target value ( PSI Rsoll), a calculated rotor-flux actual value ( PSI R) or a rotating magnetic-pole flux; a stator-circuit frequency ( omega S) is determined; a terminal-flux target value ( PSI Ksoll) is calculated in accordance with the values (ISsoll, ISqsoll, PSI R, omega S) by means of the machine parameters (L, RS), said terminal-flux target value being subsequently projected onto a flux-course curve, selected from stored, off-line optimised flux-course curves. This permits the state of the stator current (IS) to be regulated in relation to the rotor flux ( PSI R) or rotating magnetic-pole flux by means of momentary values, facilitating a stationary and dynamic precise control of motor currents (I1,I2,I3) and thus the torques (M) of a polyphase machine (4).