Ebm-papst St. Georgen Gmbh & Co Kg

Tobias Maier

Arno Karwath

Harald Schmid

Martin Mueller

Frank Heller

Rainer Strohm

Armin Fleig

Martin Müller

Gerald Hogg

Paul Layes

Juergen Pfaff

Sebastian Flihs

Andreas Pfaff

Volker Hildebrand

Matthias Weiss

Stefan Schneider

Richard Kienzler

Björn Winter

Martin MÜLLER

Michael Stadler

Michael Schmitz

Jürgen Pfaff

A control for an electromagnetic holding brake with a coil for releasing the holding brake and maintaining it in the released position, which requires a minimum brake coil voltage to maintain it in the re-leased position, having a DC-DC converter with an input and an output, the DC-DC converter being designed to convert a variable input voltage pre-sent at the input into a predetermined switch-on voltage provided at the output and a predetermined holding voltage provided at the output, the holding voltage corresponding to the minimum brake coil voltage, the DC-DC converter being designed to implement a 2-stage voltage control and, in a first stage, to maintain the switch-on voltage as a regulated DC voltage for a predetermined time, to downregulate the voltage from the switch-on voltage following a predetermined voltage curve to the holding voltage as regulated DC voltage, and to maintain it in a second stage.

Control for an electromagnetic holding brake

An electric fan has a drive motor having a fan rotor, an apparatus for generating a rotation speed signal (n_i), an apparatus for generating a power level signal (P_i) that represents power consumed; a first regulator (n_RGL) for regulating the rotation speed signal (n_i) to a predefined target value (n_s); a second regulator (P_RGL) for regulating the power level signal (P_i) to a predefined power level signal target value (P_s) that corresponds to a predefined minimum consumed power level (P_min), where the first regulator (n_RGL) and the second regulator (P_RGL) apply at least one control output signal (SW) to the drive motor and interact in such a way that, during operation, the at least one control value (SW) in a first state is determined by the first regulator (n_RGL), and in a second state is determined by the second regulator (n_RGL).

Rotation-speed-controlled fan with control of the power consumption of the electric motor

A mixed-flow fan features a housing (); an impeller () journaled rotatably with respect to the housing, and equipped with fan blades (); a generally cylindrical air conduit () defined between the fan housing and the impeller, the fan blades extending into the air conduit in order, during operation, to transport air; an external-rotor motor () having an internal stator () and an external rotor () which includes a tubular ferromagnetic yoke () partly embedded in material of the impeller. A cup-shaped yoke () fits into a central cavity () of the tubular yoke () and accommodates a permanent magnet arrangement () which interacts with the stator. The tubular yoke () and the cup-shaped yoke () together serve as a magnetic return path for the external-rotor motor. The structure minimizes damage during final assembly, and simplifies insertion of balancing weights.

Mixed flow fan

An electric motor () has a stator () and a rotor (). The latter is equipped with a cup-like rotor part () and with a ring magnet () adhesively bonded therein, which magnet has an outer circumference () on which are provided elevations () and depressions () that extend at least partly in the longitudinal direction of the ring magnet (). The outer circumference () of the ring magnet (), that faces toward the cup-like rotor part () after assembly, is formed with at least one opening or channel (), extending in a circumferential direction, that is connected to at least a plurality of the flat depressions (). Positive mechanical engagement between adhesive and ring magnet enhances durability, and discourages any tendency toward relative rotation between the magnet () and the cup-like rotor part ().

Electric motor with adhesively bonded ring magnet

Growing community of inventors

Rottweil, Germany

Tobias Maier