Siemens Schweiz Ag

Wolfgang Huber

Karl-Heinz Petry

Adrian Huwiler

Rolf Kunzmann

Various embodiments of the teachings herein include an actuator for a flap or for a valve for adjusting a gaseous or fluid volume flow. The actuator may include: a housing; an electric motor disposed in the housing; a downstream reduction gear; and a positioning element with an actuator connection for the flap or the valve. There is an electromagnet adjacent to an outer side of the rotor with a coil arrangement with a magnetic core. There is an electrical circuit arrangement for activating the electromagnet, providing a first brief current pulse, so a remanent magnetic field remains in the coil core. In a holding position of the actuator, while a mechanical pre-tensioning is set up, there is a holding torque with contact to the outer side of the rotor. The circuit arrangement provides a second brief current pulse to extinguish the remanent magnetic field still present in the coil core for releasing the holding torque with contact, forming an air gap between the electromagnet and the outer side of the rotor.

Actuator having an electric motor and an electromagnet arranged movably on the rotor of the electric motor to apply a holding torque with contact via a remanent magnetic field

Various embodiments of the teachings herein include a method for operating a valve comprising: determining a nonlinear characteristic curve function indicating a required relationship between a valve opening position and flow of a fluid; storing the function in an ECU; and using the function to set the valve opening position with a control signal indicating a target flow. The function is calculated automatically using a parameter value, with an analytic function, or by interpolation with specified supporting values by a user. The function comprises an inverse function based on a characteristic curve for a heat exchanger and a target function. The curve for the heat exchanger indicates a relationship between a heating power or a cooling power and the flow of a fluid. The target function indicates a relationship between the heating power or the cooling power of the heat exchanger based on the valve opening position. The characteristic curve for the heat exchanger depends on the same parameter value as the characteristic curve function.

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Hünenberg See, Switzerland

Wolfgang Huber