Method for emulating a three-phase electric motor using a load emulator, and a corresponding load emulator

A method for emulating a three-phase electric motor using a load emulator, the load emulator being connected in a three-phase manner via its load terminals to supply terminals of a motor controller, the load emulator having emulator power electronics and an emulator controller for controlling the emulator power electronics, the method comprising:

• determining via the emulator controller the supply terminals that are driven by the motor controller and the supply terminals that are not driven, the emulator power electronics being driven by the emulator controller such that phase currents calculated by the emulator controller on the basis of a motor model flow in the supply terminals that are driven by the motor controller;
• calculating a phase voltage by the emulator controller based on a motor model that is applied to the supply terminal that is not driven by the motor controller;
• providing the load emulator with a switch with which the emulator power electronics are disconnected with high resistance from the supply terminals and with which the emulator power electronics are connected with low resistance to the supply terminals, the supply terminals being connectable to one another through a high-resistance resistor network;
• and
• disconnecting, in order to simulate selected operating states of the electric motor, the emulator power electronics with high resistance from the supply terminals via the switch or connecting the emulator power electronics that have already been disconnected with high resistance from the supply terminals with low resistance to the supply terminals via the switch.