ebm-papst

About: ebm-papst is a company organization based out in Mulfingen, Germany. It is known for research contribution in the topics: Rotor (electric) & Stator. The organization has 572 authors who have published 736 publications receiving 3763 citations.

Vorrichtung zum Erfassen des Absolutwinkels einer Welle

Abstract: Eine Vorrichtung dient zum Erfassen des Absolutwerts der Drehstellung einer Welle (14). Die Vorrichtung hat einen ersten Singleturn-Drehgeber 30, der an einem Wellenende (20) der Welle (14) angeordnet und dazu ausgebildet ist, deren Drehstellung innerhalb einer einzigen Wellenumdrehung zu erfassen. Ferner ist eine Multiturn-Drehgebereinheit vorgesehen, welche die Zahl der Umdrehungen der Welle (14) erfasst und welche ein Untersetzungsgetriebe (18), ein von dessen Abtrieb angetriebenes Drehelement (42), das in einer gedachten Verlangerung der Welle (14) und koaxial zu dieser angeordnet ist, und einen zweiten Singleturn-Drehgeber (48) aufweist, der dazu ausgebildet ist, die Drehstellung des Drehelements (42) innerhalb einer einzigen Umdrehung zu erfassen. Das Untersetzungsgetriebe (18) umschliest die Welle (14). Sein Abtrieb (38) ist uber ein Verbindungsglied (40) um den ersten Singleturn-Drehgeber (30) herum mit dem genannten Drehelement (42) verbunden.

Method and device for reducing cogging in an electric motor

Abstract: The method reduces the reluctance moment of an electric motor known as cogging. The motor has a stator provided with groove openings and a permanent magnetic rotor. The latter has a magnetic flux density distribution, seen in the circumferential direction, with a region of essentially constant magnetic flux density in the middle of a pole. At least one additional reluctance moment is generated in the motor. This additional moment is superimposed on the first mentioned reluctance moment to reduce and/or eliminate the cogging effect. In the electronic commutator motor each pole boundary between adjacent rotor poles is divided into a number of parallel sections. The space between these sections is selected such that the rotor part with sections of a first type cooperates with the stator causing a first reluctance motor in counter-phase to a second moment.

Method for controlling a motor speed and motor for carrying out said method

Abstract: Es handelt sich um ein Verfahren zum Regeln der Drehzahl eines Motors (9; 36), welchem ein PWM-Steller (34) fur die Steuerung der Energiezufuhr zugeordnet ist. It is a method for controlling the speed of a motor (9; 36) to which a PWM control device (34) is associated for controlling the supply of energy. Das Tastverhaltnis eines vom PWM-Steller (34) abgegebenen Signals (OFF) ist abhangig von der Spannung (u_C) an einem Kondensator. The duty cycle of the PWM controller (34) output signal (OFF) is dependent on the voltage (u_C) at a capacitor. Hierbei wird aus einem die gewunschte Drehzahl charakterisierenden numerischen Wert (HL_s) und einem die tatsachliche Drehzahl charakterisierenden numerischen Wert (HL_i) eine Differenz gebildet. Here is formed a difference between a desired speed characterizing numerical value (HL_s) and the actual speed characterizing numerical value (HL_i). Vorzeichen (VZ_R) und Absolutwert (CNT_R) dieser Differenz werden ermittelt. Sign (VZ_R) and absolute (CNT_R) of this difference can be determined. Abhangig vom Vorzeichen (VZ_R) wird der Kondensator (124) geladen oder entladen.Die Ladung oder Entladung erfolgt im wesentlichen wahrend einer Zeitdauer, die proportional zur Grose des ermittelten Absolutwerts (CNT_R) der Differenz ist, um die Spannung am Kondensator (124) und damit die Drehzahl des Motors so zu beeinflussen, dass der Absolutwert (CNT_R) der Differenz abnimmt. Depending on the sign (VZ_R) of the capacitor (124) is charged or entladen.Die charging or discharging takes place substantially during a time period that is proportional to the magnitude of the determined absolute value (CNT_R) of the difference to the voltage on capacitor (124) and so that the speed of the engine to influence so that the absolute value (CNT_R) decreases the difference.

Wheel drive module of modular construction

Abstract: The invention relates to a wheel drive module comprising a wheel (R), a speed modulation gearbox (G), a first electric motor (M1) and a second electric motor (M2), wherein the first and the second electric motors (M1, M2) are designed to jointly drive the wheel (R) about a wheel axis (A) by means of the speed modulation gearbox (G) and to steer said wheel about a steering axis (L) which is orthogonal to the wheel axis (A). The wheel drive module also comprises first motor electronics (10) for controlling the first electric motor (M1) and second motor electronics (20) for controlling the second electric motor (M2) and central electronics (30) connected to the first and second motor electronics (10, 20), thus allowing a signal transfer, and the wheel drive module comprises a control logic for controlling the first and second electric motors (M1, M2), which logic is provided by the first and second motor electronics (10, 20), the central electronics (30), application electronics (40) connected to the central electronics (30), thus allowing a signal transfer, or jointly by the central electronics (30) and the first and second motor electronics (10, 20).

Method for starting a firing device in unknown general conditions

Abstract: The invention relates to a method for starting a firing device, in particular for first-time non-ignition of a gas burner, in unknown general conditions, a characteristic curve of a start air coefficient known from empirical calculations, being stored for the firing device in a memory in conjunction with the burner temperature. According to the invention, a calibration of the start profile is carried out. The ratio of opening of the gas valve (w) to the amount of air ML, required for ignition, is determined in an iterative manner by varying the amount of gas and/or air, and in the event of ignition, the firing device is started and the relevant air coefficient (λ)IGNITION is recorded.