Robert Boschgmbh

Ulrich Vollmer

Marco Roetzer

Markus Becker

Jochen Kurfiss

Armin Jerger

Michael Soellner

Mattias Hallor

Dirk Lamprecht

David Fricker

Torsten Henke

Oliver Wackerl

Timo Kuehn

Matthias Bitzer

Ekkehard Hoffmann

Tankred Mueller

Dominik Denz

Thomas Malich

Johannes Rehagen

Michael Bendel

Yanhui Xu

Min Xu

A method determines a rotor position of an electric rotating machine which is fed by a PWM-controlled inverter. Specific injection voltages, which are composed of predefined voltages and high-frequency voltages, are converted into corresponding PWM duty factors by a controller and the inverter is correspondingly actuated with these PWM duty factors. Current profiles of phase currents are then determined by measuring at least one first phase current and at least one second phase current. The measurement is carried out within a PWM period, in each case in the chronologically last third of a passive switched state. The rotor position is then determined in accordance with the ascertained current profiles and the fed-in high-frequency voltages.

Method for determining a rotor position of an electric rotating machine, and an electric rotating machine for carrying out a method of this kind

The invention relates to a method for operating an electric synchronous machine, having the steps of: &#x2014;generating centered pulse-width-modulated switching signals for switching elements (T. . . T) of half-bridges, wherein two switching elements (T. . . T) are connected to a respective half-bridge in each case; second switching elements (T. . . T) of each half-bridge are actuated in a complementary manner to the first switching elements (T. . . T) of each half-bridge if a sufficient minimum measurement duration (T) is thereby provided during which the switching signals of switching elements (T. . . T) of two half-bridges lie at different potentials; &#x2014;otherwise: &#x2014;generating pulse-width-modulated switching signals for the switching elements (T. . . T) of the half-bridges, said switching signals deviating from the center at least to such a degree that a sufficient minimum measurement duration (T) is provided, wherein &#x2014;the switching signals of the switching elements (T. . . T) are designed such that temporal changes corresponding to the minimum measurement duration (TM) in the switching signals of the switching elements (T. . . T) are prevented; and &#x2014;carrying out a 1-shunt current measurement within the provided minimum measurement duration T).

Method for operating an electric synchronous machine

A method for operating an electrically commutated machine. In at least one method step, in particular in at least one method step of overmodulation operation of the electrically commutated machine, a precommutation angle of the electrically commutated machine is set depending on an efficiency of the electrically commutated machine.

Method for operating an electrically commutated machine

The disclosure relates to a method for determining phase currents of a rotating multiphase electrical machine fed by means of a PWM-controlled inverter. In this case, injection voltages applied in at least one stipulated PWM period are determined. An evaluation direction for a phase current vector is also determined and a division of current measurements for the individual phase currents is determined on the basis of the evaluation direction. The phase currents are then determined on the basis of the previously determined division of the current measurements.

Method for determining phase currents of a rotating multiphase electrical machine fed by means of a PWM-controlled inverter

An electric machine, in particular an electric motor and/or generator, has a stator and a rotor which is designed to be permanently magnetic or to be energized in particular. The machine has at least two sub-machines. Each of the sub-machines has the same number of phases. The machine has a power output stage for each sub-machine, and the machine also has at least one control unit which is connected to the power output stages. The control unit is designed to generate a pulse width-modulated signal for actuating the power output stages. The control unit is designed to generate the PWM signal for the sub-machines such that an ascending or descending side of a PWM pulse for one sub-machine, said side representing a switching time in each case, and a pulse center of a PWM pulse for another sub-machine of the sub-machines are delayed relative to each other.

Electric machine

The disclosure relates to a method for determining a rotor position of an electric rotating machine. The electric machine comprises at least one first, multi-phase subsystem and one second multi-phase subsystem, which each comprise a PWM-controlled inverter for feeding respective winding groups. The winding groups of the at least first and second subsystems are arranged substantially electrically offset from one another by 360&#xb0;. In the method, voltages predefined by a controller are altered by feeding high-frequency voltages in order to attain high-frequency current changes. The current changes are then detected in that a current curve of phase currents is ascertained for each subsystem by measuring at least one first phase current and one second phase current. The rotor position is then determined depending on the ascertained current curves and the fed high-frequency voltages. The disclosure additionally relates to an electric machine which is designed for carrying out the method.

Method for determining the rotor position of an electric rotating machine, and an electric rotating machine for carrying out a method of this kind

An electric machine has at least two sub-machines, each having the same number of phases and being designed to generate a magnetic rotary field independently of one another to rotate the rotor. The machine has a power output stage for each sub-machine, each being designed to energize the sub-machines independently of one another. The machine also has at least one or only one control unit which is connected to the power output stages and is designed to generate a PWM signal in order to actuate the power output stages. The control unit is designed to generate the PWM signal for the sub-machines such that each of the PWM pulses for a sub-machine begins at a starting time of a PWM period and/or to generate the PWM pulses for another sub-machine such that each of the PWM pulses ends at an end time of the PWM period for the other sub-machine.

A method for adjusting an amplitude of a voltage injection of a rotating, multi-phase electric machine that is fed using a PWM-controlled inverter includes determining, at a first time, a predetermined current vector that would be present at the machine at a second time using a voltage equation of the machine based on a voltage predetermined in a controller for actuating the machine, a current vector determined from phase currents measured at the first time, and a speed of the machine. The method further includes determining a real current vector present at the machine at the second time based on phase currents of the machine measured at the second time and calculating a current vector difference between the predetermined current vector and the real current vector at the second time. The method further includes adjusting the amplitude of the voltage injection based on the calculated current vector difference.

Method for adjusting an amplitude of a voltage injection of a rotating, multi-phase electric machine, which electric machine is fed by means of a PWM-controlled inverter

The invention relates to an electric motor (), in particular a fan motor, comprising a device () for generating a sequence () of signals that comprises a plurality of especially blocks () of signals. The blocks () of signals comprise a plurality of signals () having a specific signal duration (). According to the invention, the signal duration () of the individual signals () varies.

Electric motor comprising a device for generating a sequence of signals

The invention relates to an electronically commutated electric motor with a stator and a rotor, which is designed as a permanent magnet rotor in particular. The electric motor also has a control unit which is connected to the stator. The control unit is designed to generate control signals for energizing the stator coils of the stator in order to generate a rotational magnetic field. The electric motor is designed to at least partly compensate for a torque ripple of a torque generated by the rotor. According to the invention, the electric motor has a rotor position sensor and a current sensor. The current sensor is designed to detect currents flowing in the stator coils and to generate a current signal which represents the currents. The control unit preferably has a processing unit which is designed to ascertain harmonics of the electromotive force dependent on the current signal, a voltage applied to the stator coils, and a rotor position signal generated by the rotor position sensor and to generate a control signal which compensates for the effect of the harmonics. The control unit, in particular the processing unit, is designed to superimpose the compensating control signal with the control signal so as to completely or at least partly compensate for the effect of the harmonics and thus the torque ripple.

Electronically commutated electric motor with harmonic compensation

Presented is an electronically commutated electric motor having a power output stage connected to a stator of the electric motor, and a processing unit connected to the power output stage. The processing unit drives the power output stage to produce at least one stator current. The electric motor has a current sensor which is designed to record the stator current produced by the power output stage and to generate a current signal representing the stator current. The processing unit is designed to use the current sensor to record at least one current value of the current at a recording time within an interval of time and to determine a current profile of the current in the interval of time at least on the basis of the current value and to drive the power output stage to energize the stator on the basis of the current profile determined.

Electronically commutated electric motor

A method for ascertaining the rotor temperature of a permanent-magnet synchronous machine (), in which a first estimate (T) for the rotor temperature is ascertained as a function of a remanent flux density of permanent magnets contained in a rotor of the synchronous machine (). A second estimate (T) for the rotor temperature is ascertained via a Kalman filter containing a thermal model of the synchronous machine (), the first estimate (T) for the rotor temperature being supplied at least intermittently to the Kalman filter.

Method and device for ascertaining the rotor temperature of a permanent-magnet synchronous machine

The invention relates to a method for determining the actual angle position of a rotatable magnetic component in an electric drive () having an odd number of pole pairs. An actual angle measurement value (&#x3c6;) of the rotatable component is measured using an angle sensor () which only measures the actual angle measurement value (&#x3c6;) within a predefined reduced angular area, and an associated device () for determining an actual angle position of a rotatable magnetic component in an electric drive (). According to the invention, the actual angle measurement value (&#x3c6;) measured exclusively for the reduced angular area is converted using the direction and the sign of the magnetic field of the rotatable magnetic component in a clear angular position in non-reduced angular area, the direction and sign of the magnetic field of the rotatable magnetic element () being determined by applying first test impulses (U, U, U) to the electric drive () and by evaluating the resulting second test impulses (I, I, I, I, I) which are produced in the electric drive () in reaction with the applied first test impulses (U, U, U).

Method and device for determining a current angular position of a rotatable magnetic component in an electric drive

In a method for operating a drive unit having an electric machine, in a normal operating mode the electric machine is operated with current provided by an inverter on at least two phases, and particular phase voltages for the electric machine are set on the phases. Upon an occurrence of an error of the inverter, the inverter is operated in an emergency operating mode for the further operation of the electric machine.

Method for operating a drive unit, and a drive unit

The invention relates to an electronically commutated electric motor. The electric motor comprises a stator, and a rotor, in particular a permanent-magnetic rotor. The electric motor further comprises a control unit connected to the stator. The control unit is designed to actuate the stator such that the stator can generate a magnetic rotating field for rotationally moving the rotor. According to the invention, the control unit of the electric motor is provided with a power output stage having semiconductor switches. Subject to the low-resistance, or short-circuited, semiconductor switch of the power output stage, in particular as a result of defect, the control unit is designed to actuate the stator for generating the rotating field such that during a complete rotor revolution, the rotor can provide a mechanical output, or in the operational mode, a braking torque of the electric motor caused by the defect is reduced, or completely neutralized, by the low-resistance, or short-circuited, semiconductor switch.

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Weilheim, Germany

Ulrich Vollmer