Belimo Holding Ag

Belimo Holdings Ag

Martin Ochsenbein

Curdin Stäheli

Silvio Grogg

Andreas Furrer

Roman Furrer

The invention relates to a safety controller for an actuating drive () for controlling a gas flow or a liquid flow in an open-loop or closed-loop manner by means of a flap () or a valve, in particular in the field of heating, ventilation, and air conditioning (HVAC) systems, fire-protection systems, and/or room protection systems. A safety circuit () is implemented to ensure the energy supply in a safety operating mode if an electricity supply circuit () drops off or is lost. A control value output circuit () detects status signals, in particular signals of a sensor (), and/or status parameters of a system and/or a specifiable setting of an adjustment device that can be actuated manually. The safety control value is set to one of at least two different control values (SW, SW, . . . ) depending on the status signals so that the safety position of the flap is determined adaptively.

Safety controller for an actuator

A DC-motor () actuates a highly-reduced reduction gear of an actuating drive for a flap or valve in order to regulate a gas or liquid volume flow, particularly for heating/ventilation/climatization, or fire or room protection. Current flow in the stator coils (A, B, C) is commutated in a program-controlled manner without integrated position sensors. Algorithms enable counting rotations of rotor () of the DC-motor (). Problems related to the principle of motor rotation speed at low rpm are prevented. The DC-motor () includes a stator () having three stator coils (A, B, C) which extend over 3n stator poles (), and an annular-shaped permanent magnet rotor () having 2m permanent magnet segments with alternating polarity (N, S), a coaxial cup-shaped external rotor () and a coaxial drive shaft (), whereby n and m are whole multiplication factor numbers (1, 2, 3, 4) and are different from each other. Drive shaft () comprises, preferably, a spring () for the automatic return in case of current interruption.

Brushless DC-motor

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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Russikon, Switzerland

Martin Ochsenbein