Abstract: A control device (1) is configured to reduce the commutation angle error ? of a three-phase (u, v, w) EC motor (2.2) connected via a y-configuration. The three phases (u, v, w) are commutated via a motor control (3) including a rotor position sensor (4) and a control circuit (10). The rotor position sensor (4) senses the relative angular position of the rotor using the neutral-point potential at the neutral point of the y-configuration. The control circuit (10) is configured to impose a desired field weakening current component on the motor control (3) for reducing the commutation angle error ?.

Abstract: The invention relates to a method for sensor-free position determination of the rotor position of an electronically commutated multiple-phase EC motor comprising a rotor, and a stator and comprising a commutation device for generating string currents in the coil system of the stator by applying a test signal in the coil system, measuring the current value i in the strand during the measurement phase (PHMess) as a current response to the test signal, calculating i for determining the envelope determining of the current response and determining the rotor position therefrom.

Abstract: A switching device, in particular an electrical power circuit breaker, is disclosed for protecting an electrical circuit. The switching device includes two pole terminals, a switching mechanism for automatically interrupting the electrical connection of the two pole terminals in the event of an overload, electrical components for controlling the switching device and a pole cassette in which the switching mechanism is disposed in a switching chamber. The pole cassette includes at least one gas duct which is connected to the switching chamber in a gas-communicating manner and is designed to discharge gas from the pole cassette past the electrical components to the environment.

Abstract: A switching gas damper is for low voltage power switches, especially for low voltage power switches which can be inserted into low voltage switching installations. The switching gas damper is arranged above an arc extinguisher of the low voltage power switches and includes at least one inlet for switching gases and at least one outlet for damped deionised switching gases. The switching gas damper is provided with a carrier element which can be arranged directly adjacent to the arc extinguisher and can be fixed to a housing receiving the low voltage power switch. The carrier element forms at least one receiving chamber for a flow element creating a flow resistance for the switching gases, and the at least one receiving chamber can be closed by at least one closing element fixing the at least one flow element. The carrier element forms the at least one inlet and the at least one closing element forms the at least one outlet.

Abstract: A switching gas damper is for low voltage power switches, especially for low voltage power switches which can be inserted into low voltage switching installations. The switching gas damper is arranged above an arc extinguisher of the low voltage power switches and includes at least one inlet for switching gases and at least one outlet for damped deionised switching gases. The switching gas damper is provided with a carrier element which can be arranged directly adjacent to the arc extinguisher and can be fixed to a housing receiving the low voltage power switch. The carrier element forms at least one receiving chamber for a flow element creating a flow resistance for the switching gases, and the at least one receiving chamber can be closed by at least one closing element fixing the at least one flow element. The carrier element forms the at least one inlet and the at least one closing element forms the at least one outlet.