Belimo Holding Ag

Roman Furrer

Daho Taghezout

Martin Ochsenbein

Curdin Stäheli

The invention relates to a brushless direct-current motor (), comprising a stator (), a rotor cup () that revolves around the stator () and has a plurality of permanent-magnet poles (N, S), and a detent torque plate () that is connected to the stator () and has several pole shoes () for generating a detent torque that brings the revolving rotor cup () into a detent position. The pole shoes () are each arranged in the detent position between two adjacent poles (N, S) of the revolving rotor cup () to form a magnetic short circuit. The detent torque plate () is arranged substantially outside of the magnetic rotating field produced by the stator () during operation, whereby the production of the detent torque is decoupled from the electrical behavior of the brushless direct-current motor () and the power of the brushless direct-current motor () is not substantially influenced by the presence of the detent torque plate ().

Brushless direct-current motor having currentless stoppage

A safety drive unit () with a safety circuit () that resets a flap or a valve into a specified safety position for controlling a gas or liquid volumetric flow, in particular in the field of heating, ventilation, and monitoring systems. The safety drive unit () comprises an actuator () with a controllable electric motor (28), a capacitive energy storage unit (), and energy converter () with a power module, and a power supply (). During normal operation, the electric current in the power module of the energy converter () is converted to a lower voltage and stored in the capacitive energy storage unit. If the voltage drops below a predetermined value or if there is a power failure, the stored electrical charge is converted back to a higher voltage by the same power module, and the electric motor () is activated until the specified safety position is reached.

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Eschenbach, Switzerland

Roman Furrer