METHOD FOR OPERATING A CONTROL SYSTEM OF AN ELECTRIC MACHINE AND SYSTEM FOR CONTROLLING AN ELECTRIC MACHINE

摘要

The invention relates to a method for operating a control system for an electric machine (1), the control system comprising a controllable energy store (5), an intermediate circuit capacitor (4) located downstream of the controllable energy store (5), and an inverter (2) located downstream of the intermediate circuit capacitor (4), wherein said inverter can be connected to the electric machine (1). The controllable energy store (5) is thereby provided with a power supply branch (6) having at least two series-connected energy storage modules (7), each comprising at least one electrical energy storage cell (8) having an associated controllable coupling unit (9). In dependence on control signals, the coupling units (9) by-pass the respective associated energy storage cells (8), or said coupling units switch the respective associated energy storage cells (8) into the power supply branch (6). At least one coupling unit (9) of the controllable energy store (5) is actuated in a pulsed manner such that the arithmetic average of the output voltage of the controllable energy store (5) corresponds to a nominal output voltage, wherein the energy storage cells (8) respectively associated with the at least one coupling unit (9) are switched into the power supply branch (6) during a pulse duration, and are by-passed during idle time.