Multi-motor inverter for a plurality of motors and detection methods for detecting shifts in the speeds of the motors

A control system (1) comprising a multi-motor inverter (PWR) for the controlled parallel operation of a number of n EC motors (M1, . . . , Mn), where n≥2, comprising

• a. a stabilization system comprising a stabilization controller (RS),
• b. a dq-current controller, to which at least the target current value Id,target is inputted as a controlled variable from the stabilization controller (RS) arranged on the input side in space vector representation, on the basis of which the dq-current controller determines the voltage control variable Ud,
• c. wherein at least one or more current detection circuits are provided to measure the phase current of one or more of the n EC motors (M1, . . . , Mn) in order to detect current oscillations and/or oscillations on the basis of the detected information about the current and to regulate the multi-motor system into a stable state via the target current variable Id,target by means of the stabilization controller (RS).