Method for the controlled imprinting of a stator current and a torque setpoint for a converter-fed induction machine

摘要

The invention relates to a method for the controlled application of a stator-current target value (ISnom) and a torque target value (Mnom) for a polyphase machine (4) that is supplied by an electronic power converter. According to the invention: current components (ISdnom, ISqnom) 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 (Rnom), a calculated rotor-flux actual value (SBR/SB) or a rotating magnetic-pole flux; a stator-circuit frequency (SBS/SB) is determined; a terminal-flux target value (Knom) is calculated in accordance with the values (ISnom, ISqnom, SBR/SB, SBS/SB) by means of the machine parameters (L, RSBS/SB), 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 (ISBS/SB) to be regulated in relation to the rotor flux (SBR/SB) 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).