Patent ID: 8704465

Claim:
An electrical drive connectable to a power supply network, comprising: a motor having a stator and a rotor supported rotatably relative to the stator; a spring device linked to the rotor to apply a restoring force to the rotor when the rotor is deflected from an idle position; and a motor control for the motor, connectable to the power supply network, including a DC circuit with a back-up capacitor arranged in the DC circuit, the DC circuit feeding energy into the back-up capacitor when the power supply network is connected and the back-up capacitor supplying the control device with energy when the power supply network is not connected, a switching device, having switching elements, coupled to the motor to enable the motor to be connected to the back-up capacitor, a control device activating the switching device for the motor when energy is fed into the back-up capacitor from the power supply network, controlling the switching elements of the switching device, based on a required deflection of the rotor prespecified to the control device from outside the motor control to adjust an actual deflection of the rotor to the required deflection, and, when the rotor is deflected from the idle position and energy being fed into the back-up capacitor from the supply network fails, automatically setting the required deflection to the idle position and activating the switching elements of the switching device such that the motor, at least at the beginning of being restored by the spring device, feeds energy into the back-up capacitor via the switching elements of the switching device.