The invention relates to a commutation method and to a single-strand EC motor with a winding strand with two winding connections, comprising a current regulating device in the winding strands between the winding connections, wherein the current regulating device is designed to regulate the winding current of the single-strand EC motor during a first commutation phase with a positive current flow and a second commutation phase with a negative current flow in each case at a constant value, and the value of the average output voltage uw(t) of the current regulator is used to ascertain the commutation time.

Sensor-free commutation method

Method for starting (101, 102) an electronically commutated, brushless drive motor (1) of an auxiliary assembly of a motor vehicle, which drive motor has a motor stator (2) comprising at least one stator coil (21) and a permanent-magnet motor rotor (3), wherein power can be supplied to the stator coil (21) with a prespecified coil voltage (200) and a prespecified constant start-up rotation frequency (300) by means of a control electronics system (4) and a power electronics system (41) for generating a rotating field in order to drive the motor rotor (3), said method comprising the following steps: - supplying power (520) to the stator coil (21) with a coil voltage (200) which corresponds to a start value (201), - increasing (521) the coil voltage (200) in steps, and - monitoring (540) an electric current (400) flowing through the power electronics system (41), wherein - when a voltage drop (403) by a minimum value (400a) is detected (541), the following procedure is followed: - the operation of increasing (521) the coil voltage in steps is terminated, and - a start-up voltage value (202), which is applied to the stator coil (21) during the termination operation, is increased once for safety reasons (522) by a prespecified safety value (200b) to a first operating voltage value (203) at which the motor rotor (3) can be driven in an unregulated mode.

Method for starting a drive motor of an auxiliary assembly of a motor vehicle, and drive motor of an auxiliary assembly of a motor vehicle

The invention relates to a method for operating an electronically commutated electric machine (2), having the following steps: Activating a driver circuit (3) in accordance with a commutation schema by switching power semiconductor switches (32, 33); applying a pulse width modulation to the switching of the power semiconductor switches (32, 33); and limiting a pulse control factor of the pulse width modulation to a pulse control factor threshold value.

Method and device for operating an electronically commutated electric machine

Ein digitaler Resonanztreiber fur einen elektrischen Resonator (1) umfasst eine H-Brucke (2) mit zwei Zweigen, in deren Mitte der Resonator anzuschliessen ist, einen ersten Stromsensor (13), der ein Ausgangssignal liefert, das den zeitlichen Mittelwert des vom Ausgang des ersten Zweiges (A) der H-Brucke (2) zur Erde (11) fliessenden Stroms reprasentiert, einen zweiten Stromsensor (14), der ein Ausgangssignal liefert, das den zeitlichen Mittelwert des vom Ausgang des zweiten Zweiges (B) der H-Brucke (2) zur Erde (11) fliessenden Stroms reprasentiert, und eine digitale Steuereinheit (15), die eingerichtet ist, die Differenz zwischen dem Ausgangssignal des ersten Stromsensors (13) und dem Ausgangssignal des zweiten Stromsensors (14) zu bilden, zwei Rechtecksignale fur die Steuerung der beiden Zweige der H-Brucke (2) zu bilden, die eine gleiche Frequenz und einen Tastgrad von 50% aufweisen und relativ zueinander um einen einstellbaren Phasenwinkel phasenverschoben sind, und die Frequenz der Rechtecksignale zu erhohen, wenn die besagte Differenz ein vorbestimmtes Vorzeichen hat, und die Frequenz zu verringern, wenn die besagte Differenz das umgekehrte Vorzeichen hat.

Digitaler Resonanztreiber für einen elektrischen Resonator.

Ein elektronisch kommutierter Elektromotor (20) hat einen Rotor (28) und einen Stator, mit einer Statorwicklungsanordnung (26), wobei dem Stator im Betrieb aus einer Energiequelle (47) elektrischer Strom (i1) fur den Antrieb des Motors (20) zufuhrbar ist. An electronically commutated electric motor (20) has a rotor (28) and a stator with a stator winding (26), wherein the stator during operation from an energy source (47) of electrical current (i1) for the drive of the motor (20) can be fed , Der Motor hat einen digitalen Rechner (36), der zur Steuerung des regularen Starts des Motors (20) ausgebildet ist und dem ein PWM-Generator (84) zugeordnet ist. The motor has a digital computer (36) which is adapted to control the regular start of the engine (20) and is assigned to the a PWM generator (84). Der Motor (20) ist fur Betrieb in einem Parameterbereich ausgelegt, welcher mindestens einen variablen Parameter, z. B. die Betriebsspannung oder die Umgebungstemperatur, umfasst, der beim Start des Motors (20) unterschiedliche Werte haben kann. The motor (20) is designed for operation in a parameter range which at least one variable parameter z. B. the operating voltage or the ambient temperature covers, which can have (20) different values ​​at the start of the engine. Der Mikrocontroller (36) ist zur Ausfuhrung folgender Schritte ausgebildet: Nach dem Einschalten des Motors (20) wird, vor dem Beginn des regularen Starts, wahrend einer ersten Phase (T1) der der Statorwicklungsanordnung (26) zugefuhrte Strom (i1) mit einem vorgegebenen, von dem mindestens einen variablen Parameter abgeleiteten Tastverhaltnis (pwm) gesteuert, um einen Start des Motors (20) zu bewirken; The microcontroller (36) is configured to perform the following steps: After switching on the motor (20) is, before the start of the regular start, during a first phase (T1) of the stator winding (26) supplied current (I1) given with a , controlled by the at least one variable parameter derived duty cycle (pwm), to effect a start of the engine (20); anschliesend an die erste Phase (T1) wird, wenn sich der Rotor (28) dreht, der regulare Start des Motors (20) durchgefuhrt. Subsequently, to the first phase (T1), when the rotor (28) rotates, the regular start of the engine (20) is carried out.

Electronically commutated electric motor

The motor (20) has a stator fixed in interaction with a permanent magnetic rotor (28). The stator includes a stator-phase winding (26), which is arranged in shunt arms (24) of an H-bridge (22). The stator-phase winding is operated after a point by appropriate control of the H-bridge in a short-circuit at the beginning of a commutation process, in order to cause decreasing circulating current (i') by the stator-phase winding, where the circulating current reaches a null valve at another point. A time interval between a third point and the latter point is changed to a minimum by changing steps.

Benjamin Haas

Papers

Electronically commutated electric motor

Electronically commuted motor