Ebm-papst St. Georgen Gmbh & Co Kg

Papst-motoren Gmbh & Co Kg

Papst Licensing Gmbh

Thomas Von Der Heydt

Hermann Rappenecker

Frank Jeske

Fritz Schmider

Arnold Kuner

Wolfgang Arno Winkler

Hans-Dieter Schondelmaier

Hansjörg Berroth

Stefan Lukenich

Günther Strasser

Paul Layes

A method is disclosed for controlling the commutation in an electronically commutated motor () which comprises a stator having at least one phase (), and a permanent-magnet rotor (), and with which a current limiter () and a controller () for regulating a motor variable are associated. The current limiter () serves to limit the current (I) in the at least one phase () to a setpoint value. The regulation by means of the controller () is accomplished by modifying the distance in time (W) between switching on (t) and switching off (t) of the current (i, i) in the at least one phase. In this method, the setpoint value to which the current limiter limits the current (i, i) in the relevant phase is modifiable. It is modified substantially as a function of a ratio of two times (W/T), namely as a function of the ratio of the distance in time (W) between switching on (t) and switching off (t) of the current (i, i) in the relevant phase () to the time period (T) required by the rotor, at the instantaneous rotation speed, to rotate through a specified rotation angle. A decrease in noise at low rotation speeds is thereby made possible.

Method of controlling the commutation in an electronically commutated motor, and an electronically commutated motor for carrying out said method

An improved fan useful for ventilating applications in motor vehicles features a modular structure, which facilitates quick replacement of any components likely to fail. A first module () is intended for permanent installation on the part that is to be cooled. A second module () is configured for quick engagement to and disengagement from the first module. The second module preferably comprises a hub (), an internal stator () mounted on the hub, and one or more struts () connecting the hub to a cylindrical casing part () which surrounds but is spaced from the outside of the fan wheel (). The struts form a lattice () which can be easily grasped for swapping out the second module when repair or replacement becomes necessary. The fan has a Hall sensor () and a control circuit () which regulates fan speed according to PWM (Pulse Width Modulation) or DC voltage signals () supplied from outside and has means () for generating a fault signal in the event of a fault state, and for sending the fault signal out on a control line ().

Equipment fan

An electric motor (12) is supplied with current (i.sub.mot) via a semiconductor switch (14). During operation, the semiconductor switch (14) is driven by a Pulse Width Modulation (PWM) unit 15 using a pulse-formed signal (32). For regulation of the duty ratio of this pulse-formed signal, a first analog signal, which is a function of at least a first motor parameter, is fed to the PWM unit. Further, a second analog signal (STBGR), which is a function of at least a second motor parameter, is fed to the PWM unit for regulation of the duty ratio. As long as the second motor parameter does not exceed a predetermined value, the duty ratio is predominantly controlled by the value of the first analog signal. When the second motor parameter exceeds the predetermined value, the duty ratio is at least predominantly controlled by the value of the second motor parameter, in order to control this second motor parameter through the PWM unit.

Method of controlling an electric motor and apparatus for carrying out

A low noise brushless dc motor has a rotor with a permanent magnet and a stator with a bearing system mounting a shaft for rotating the rotor. The motor has an operating circuit that includes a tachometer winding connected to the base of a first transistor whose collector is in series with a first resistor. The other end of the tachometer winding is connected to the base of a second transistor whose collector is in series with a second resistor.

Low noise miniature electric motor

Growing community of inventors

St. Georgen, Germany

Thomas Von Der Heydt