Ebm-Papst St. Georgen Gmbh & Co Kg

Jens Loeffler

Henry Weissbach

Frank Jeske

Wolfgang Laufer

Alexander Hahn

Arnold Kuner

Daniel Hauer

Markus Braxmaier

Michael Kisch

Marcus Hellmann

Mario Staiger

Manfred Bitzer

Claus Foell

The invention relates to an orbital pump for pumping a fluid, wherein the pump comprises at least one pump control system, a motor that can be controlled by the pump control system, a rotor shaft () for fluid transport, and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft (), the rotor sensor is connected to the pump control system and designed to transmit the angle of rotation of the rotor shaft () to the pump control system, and the pump control system is designed to rotationally control the rotor shaft () by means of the motor until the rotor shaft () is in a pre-determined angle of rotation position.

Pump with detection of absolute angle of rotation

An arrangement () for specifying the pressure (), produced by a pump () driven by an electric motor (), includes a processor () which derives a target pressure value () from an internal torque value () and a loss torque (). The arrangement () further derives () the internal torque value () from a motor current value () and a motor constant k.

Arrangement for specifying a pressure

An electronically commutated motor is operated from a DC voltage source (U), e.g. from a DC link circuit (). The motor has a permanent-magnet rotor () and a stator having a stator winding strand () in which, during operation, an alternating voltage is induced by the permanent-magnet rotor (). It further has an H-bridge circuit () having power semiconductors (Tto T). At the beginning of a commutation operation, the presently conductive semiconductor switch of a first bridge half () is switched off, in order to interrupt energy delivery from the DC voltage source (U), so that, in the other bridge half (), a loop current (i*; &#x2212;i*) flows through the stator winding strand (), through the semiconductor switch still controlled to be conductive therein, and through a recovery diode () associated with the blocked semiconductor switch of that other bridge half. This loop current converts the energy stored in the magnetic circuit of the motor () at least partly into driving energy for the permanent-magnet rotor (), and in that context the stored energy drops to zero. This currentless state of the stator winding strand () is detected in a sensorless manner by measuring the voltage (u) induced by the rotor () in the stator winding strand ().

Method of operating a single-stranded electronically commutated motor from a DC voltage source, and motor for carrying out such a method

An electronically commutated one-phase motor () has a stator having at least one winding strand () and a permanent-magnet rotor (). The rotor, as it rotates, induces a voltage (u) in the at least one winding strand (). The motor has an electronic calculation device (), preferably a microcontroller &#x3bc;C, which is configured to execute, during operation, the steps of a) sensing the value of the instantaneous operating voltage (Ub); (b) using the operating voltage value (Ub) and optionally further parameters, adjusting a time duration (T) of a switch-on current pulse (i) for the motor, in order to apply a consistent amount of electrical energy to the windings during start-up attempts, thereby maximizing the probability of successful start-up, regardless of possible fluctuations in motor operating voltage and related operating parameters. The switch-on current pulse duration (T) can be adjusted longer or shorter, as a function of operating experience.

One-phase electronically commutated motor

Growing community of inventors

Villingen-Schwenningen, Germany

Jens Loeffler