Papst-motoren Gmbh & Co Kg

Ebm-papst St. Georgen Gmbh & Co Kg

Stefan Lukenich

Fritz Schmider

Hermann Rappenecker

Thomas Von Der Heydt

A compact electric motor has a rotor, and a stator () having a slotted lamination stack () defining slots separated by teeth, the teeth having tooth heads (). Partial windings () are arranged on the teeth. On at least one axial end of said lamination stack, jumper rings () and a neutral ring () are arranged. The neutral ring has a plurality of inwardly extending radial projections () having free ends () adapted for connection to ends () of the partial windings (). Connection of partial windings () in parallel provides a favorable power/size ratio and substantial power output, even with low operating voltage.

Electric motor with space-saving low-resistance neutral ring

An electronically commutated direct-current motor has a permanent-magnet rotor ( ), a stator ( ) that has at least one drive winding ( ), and an H-bridge circuit ( ) in which two bridge elements are configured as transistors ( ) and the other two bridge elements as resistors ( ), the drive winding ( ) being arranged on the diagonal of said H-bridge circuit ( ); and it has a commutation circuit for alternate activation and deactivation of the two transistors ( ) of the H-bridge circuit ( ). The motor operates quietly and with unusual reliability, and is well adapted for driving a fan.

Electronically commutated DC motor

An electronically commutated motor has a rotor and a stator interacting with one another. A semiconductor control member controls a motor current supplied to the stator. An arrangement is provided that detects values of the motor current which surpass a preset threshold value and generates a first signal upon surpassing the threshold value. An arrangement is provided that determines rotational speed values of the motor, which surpass a preset rotational speed, and generates a second signal upon surpassing the preset rotational speed. An arrangement is provided that combines the first and second signals for generating a combined signal, wherein the combined signal acts substantially without temporal delay on the semiconductor control member and reduces the motor current to a value which is greater than zero.

Electronically commutated motor

An electronically commutated motor ( ) has a permanent-magnet rotor ( ) and has a stator ( ) that has two winding phases ( ). During one rotor rotation of el., firstly current is delivered to the one winding phase ( ) within a first rotation angle range via an associated first semiconductor switch ( ); and within a subsequent second rotation angle range, current is delivered to the other winding phase ( ) via an associated second semiconductor switch ( ). The motor further has a commutation apparatus for alternatingly switching ON the first semiconductor switch ( ) and the second semiconductor switch ( ). This commutation apparatus comprises a bistable multivibrator (FF ) whose switching state is controlled, via at least one comparator ( ), by the voltage that is induced by the permanent-magnet rotor ( ) in that winding phase ( or ) which is currentless at that instant and which, in the instantaneous rotation angle range of the rotor ( ), is not being supplied with current via its associated semiconductor switch ( or ).

An electronically commutated motor ( ) has a stator ( ) with two winding phases ( ) which are alternatingly supplied with current during one rotor rotation through &deg; cl. The motor also has a permanent-magnet rotor ( ) which, when the motor ( ) is currentless, assumes at least one predefined rotational position from which the rotor starts in a desired rotation direction upon excitation of a predefined winding phase. A bistable multivibrator ( ), which is controlled by the voltage that is induced by the rotor in the instantaneously currentless winding phase, is provided for alternatingly switching on the two winding phases. The bistable multivibrator ( ) has an electrical preferred position ( ) that it assumes when the motor ( ) is switched on, in order to supply power, during the switching-on operation, to the predefined winding phase and thereby to allow the rotor to start in the desired rotation direction. The motor current can be temporarily increased at startup in order to increase the torque at startup.

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.

Growing community of inventors

Singen, Germany

Stefan Lukenich