Abstract: A method and a control apparatus for determining parameters for controlling an electric drive having an electric machine improve the start-up of the electric drive by applying a current indicator as a signal at three-phase winding connections of the electric machine, and measuring a d-component and a q-component of the stator voltage and of the stator current at the winding connections. In a first measurement step, a rotating current indicator is applied to the three-phase winding connections and the electric machine is oriented such that an exciter current in the q-axis assumes a minimum. In a second measurement step, when the rotor of the electric machine is stationary, a field winding of the electrical machine is short-circuited and a current indicator in form of a binary noise signal is applied to the winding connections. A stator impedance is then determined as a first control parameter.

Abstract: An electrical power supply system, in particular for a microgrid, includes a DC bus, and a first rectifier and a second rectifier, with the first and second rectifiers each supplying power to the DC bus. The first rectifier is a diode rectifier and the second rectifier has switchable power semiconductors. The electrical power supply system further includes a generator supplying power to both rectifiers. The rectifiers can be connected at different times according to a load.

Abstract: The invention relates to a method for detecting wear in a frictionally locking clutch (50) or a frictionally locking brake (2, 40), the clutch (50) or the brake (2, 40) having at least one electrically excitable coil (4) and at least one element (20, 21, 23) which can move in rotation about an axis (3), to bring about frictional locking with at least one corresponding mating element (22, 28, 54), at least the element (20, 21, 23) which can move in rotation or the corresponding mating element (22, 54) being axially movable, and it being possible to form an airgap (26). The wear (46) can be inferred by virtue of the fact that the electric current is measured by the electrically excitable coil (4), evaluated and the evaluation compared with at least one reference value.

Abstract: The invention relates to a method for detecting wear in a frictionally locking clutch (50) or a frictionally locking brake (2, 40), the clutch (50) or the brake (2, 40) having at least one electrically excitable coil (4) and at least one element (20, 21, 23) which can move in rotation about an axis (3), to bring about frictional locking with at least one corresponding mating element (22, 28, 54), at least the element (20, 21, 23) which can move in rotation or the corresponding mating element (22, 54) being axially movable, and it being possible to form an airgap (26). The wear (46) can be inferred by virtue of the fact that the electric current is measured by the electrically excitable coil (4), evaluated and the evaluation compared with at least one reference value.