Abstract: A method for operating a brushless and sensorless multi-phase electric motor. At least two phase voltages and at least two phase currents of the electric motor are determined. A voltage vector is determined from the phase voltages and/or a current vector is determined from the phase currents. A position substitute signal is determined as a measure of a rotor position on the basis of an angle of the current vector and/or of the voltage vector. A rotation value is calculated on the basis of the position substitute signals, and the electric motor is controlled by open-loop and/or closed-loop technology on a basis of the rotation value.

Abstract: A method for operating a brushless and sensorless multi-phase electric motor. At least two phase voltages and at least two phase currents of the electric motor are determined. A voltage vector is determined from the phase voltages and/or a current vector is determined from the phase currents. A position substitute signal is determined as a measure of a rotor position on the basis of an angle of the current vector and/or of the voltage vector. A rotation value is calculated on the basis of the position substitute signals, and the electric motor is controlled by open-loop and/or closed-loop technology on a basis of the rotation value.

Abstract: A method for determining a motor current of an electric motor drive with a power source and with an electric motor and with a power converter connected therebetween, wherein an input current of the power source is converted by a pulse width modulated control of a number of semiconductor switches of the power converter into the motor current, wherein an intermediate circuit current of an intermediate circuit of the power source is influenced during the pulse width modulated control of the semiconductor switches, wherein an inductive voltage change is detected at a measuring point of the intermediate circuit due to the influence on the intermediate circuit current, and wherein a value for the generated motor current is determined based on the pulse width modulated control of the semiconductor switches and the inductive voltage change detected at the measuring point.

Abstract: A method for operating an electric machine with a power source, an electric motor, and an intermediary power converter, in which an input current of the power source is converted to a multi-phase output current for the electric motor by a pulse width modulated control of a number of semiconductor switches of the converter, wherein the or each pulse is generated at a first point in time and terminated after a pulse duration at a second point in time, in which for each alternating current component, which is generated in the course of the pulse-width-modulated driving of the semiconductor switches in an intermediate circuit of the power source, a frequency spectrum is determined, and in which the pulse durations of the pulses of the pulse width modulated control can be set such that the sum of the frequency spectra of the alternating current components is minimal.

Abstract: A method for determining a motor current of an electric motor drive with a power source and with an electric motor and with a power converter connected therebetween, wherein an input current of the power source is converted by a pulse width modulated control of a number of semiconductor switches of the power converter into the motor current, wherein an intermediate circuit current of an intermediate circuit of the power source is influenced during the pulse width modulated control of the semiconductor switches, wherein an inductive voltage change is detected at a measuring point of the intermediate circuit due to the influence on the intermediate circuit current, and wherein a value for the generated motor current is determined based on the pulse width modulated control of the semiconductor switches and the inductive voltage change detected at the measuring point.

Abstract: A method for operating an electric machine with a power source, an electric motor, and an intermediary power converter, in which an input current of the power source is converted to a multi-phase output current for the electric motor by a pulse width modulated control of a number of semiconductor switches of the converter, wherein the or each pulse is generated at a first point in time and terminated after a pulse duration at a second point in time, in which for each alternating current component, which is generated in the course of the pulse-width-modulated driving of the semiconductor switches in an intermediate circuit of the power source, a frequency spectrum is determined, and in which the pulse durations of the pulses of the pulse width modulated control can be set such that the sum of the frequency spectra of the alternating current components is minimal.

Abstract: A method for operating an electric machine with a power source and with an electric motor and with an intermediary power converter, wherein an input current of the power source is converted into a multi-phase output current for the electric motor by means of a pulse width modulated control of a plurality of semiconductor switches of the converter, wherein during each period of control, for at least one phase, a pulse with a pulse duration is generated during a period duration, wherein in a period, a pulse is divided into a leading first half-pulse and a trailing second half-pulse with in each case half a pulse duration, and wherein the first half-pulse with a first displacement time and the second half-pulse with a second displacement time are mutually shifted in time within the period duration of the period.

Abstract: The invention relates to a generic method for determining the rotor position of an electronically-commutated multi-phase direct current motor, characterized in: (a) generating of a plurality of test voltage pulses in the winding system with a specified switch-on duration ?T by means of the commuting device in different phase distributed over 360°; (b) measurement of the current values of the current responses of the test voltage pulses on expiration of the switch-on period of the respective test voltage pulse; (c) approximation of the measured current values by means of a periodic approximation function from a superimposition of a preferably sinusoidal fundamental wave with an amplitude IEMK and the associated first harmonic with an amplitude Und as a factor of the phase of the test voltage pulse, wherein the sinusoidal fundamental wave follows the chronological progression of the counter EMF voltage of the stator and the first harmonic follows the chronological progression of the stator of the direct current

Abstract: A method for operating a brushless, rotating electrical machine, including at least three phase windings, each of which has a first phase winding terminal and a second phase winding terminal. The phase windings are connected to each other, in particular the particular second phase winding terminals are connected to a shared star point, and phase-width-modulated voltage signals being applied separately to each individual phase winding, and at least one selected phase winding being at least temporarily connected to a constant electrical potential. To minimize switching operations and to reduce the alternating current component of the current source, the pulses of the pulse-width-modulated signals applied to the remaining phase windings are at least temporarily phase-shifted with respect to each other during the period in which the selected phase winding is connected to a constant electrical potential.

Abstract: A method for positioning a brushless electric drive comprising a stator that has at least one phase winding to which a voltage signal can be applied, and a rotor equipped with magnetic poles. In the method, a voltage signal is applied to the at least one phase winding, the voltage signal generates a magnetic field as a result of the current flowing in the phase winding. The magnetic field putting the rotor into alignment, and as long as the rotor is in motion, the voltage signal is modified in accordance with the intensity of the current induced in the at least one phase winding by the moving rotor, in such a way that the induced current is increased.

Abstract: A method for determining the position of an at least two-phase, in particular three-phase bmshless electric drive comprising at least two phase windings, each of which has a first and a second terminal, a second terminal of a first phase winding being electrically connected to the first terminal of a second phase winding at a common connecting terminal. In order to be able to reliably determine the position of the electric drive even at low speeds, a voltage pulse is applied between the first terminal of the first phase winding and the second terminal of the second phase winding, the resulting voltage at the connecting terminal or at a third phase winding connected thereto is detected and the voltage ratio between the first phase winding and the second phase winding is determined therefrom, and the ratio between the variable inductances is determined from said voltage ratio.

Abstract: A method for operating a brushless, rotating electrical machine, including at least three phase windings, each of which has a first phase winding terminal and a second phase winding terminal. The phase windings are connected to each other, in particular the particular second phase winding terminals are connected to a shared star point, and phase-width-modulated voltage signals being applied separately to each individual phase winding, and at least one selected phase winding being at least temporarily connected to a constant electrical potential. To minimize switching operations and to reduce the alternating current component of the current source, the pulses of the pulse-width-modulated signals applied to the remaining phase windings are at least temporarily phase-shifted with respect to each other during the period in which the selected phase winding is connected to a constant electrical potential.

Abstract: The invention relates to a generic method for determining the rotor position of an electronically-commutated multi-phase direct current motor, characterised in: (a) generating of a plurality of test voltage pulses in the winding system with a specified switch-on duration ?T by means of the commuting device in different phase distributed over 360°; (b)—measurement of the current values of the current responses of the test voltage pulses on expiration of the switch-on period of the respective test voltage pulse; (c) approximation of the measured current values by means of a periodic approximation function from a superimposition of a preferably sinusoidal fundamental wave with an amplitude IEMK and the associated first harmonic with an amplitude Und as a factor of the phase of the test voltage pulse, wherein the sinusoidal fundamental wave follows the chronological progression of the counter EMF voltage of the stator and the first harmonic follows the chronological progression of the stator of the direct current

Abstract: A method for positioning a brushless electric drive comprising a stator that has at least one phase winding to which a voltage signal can be applied, and a rotor equipped with magnetic poles. In the method, a voltage signal is applied to the at least one phase winding, the voltage signal generates a magnetic field as a result of the current flowing in the phase winding. The magnetic field putting the rotor into alignment, and as long as the rotor is in motion, the voltage signal is modified in accordance with the intensity of the current induced in the at least one phase winding by the moving rotor, in such a way that the induced current is increased.

Abstract: A method for determining the position of an at least two-phase, in particular three-phase bmshless electric drive comprising at least two phase windings, each of which has a first and a second terminal, a second terminal of a first phase winding being electrically connected to the first terminal of a second phase winding at a common connecting terminal. In order to be able to reliably determine the position of the electric drive even at low speeds, a voltage pulse is applied between the first terminal of the first phase winding and the second terminal of the second phase winding, the resulting voltage at the connecting terminal or at a third phase winding connected thereto is detected and the voltage ratio between the first phase winding and the second phase winding is determined therefrom, and the ratio between the variable inductances is determined from said voltage ratio.

Abstract: The invention specifies a circuit arrangement (1, 20) for controlling a brushless electric motor (37) with a control chip (2), particularly a microcontroller, which has a number of PWM contacts (8), which can be used to output a PWM signal, and a number of commutation contacts (5,5?, 6,6?, 7,7?), which can be used to output a commutation signal. In this case, provision is made for at least one commutation contact (5,5?, 6,6?, 7,7?) to be alternately controllable as an input and an output, for the at least one commutation contact (5,5?, 6,6?, 7,7?) to have its output electrically connected to a PWM contact (8), and for the commutation contact (5,5?, 6,6?, 7,7?) connected in this manner to be able to be contacted for the purpose of tapping off a control signal. Such a circuit arrangement (1,20) increases the control options for a given control chip (2). The number of PWM sources required is reduced.

Abstract: The invention relates to a method carried out with simple means for determining the position of the rotor in a sensorless and brushless multi-phase electric motor (1) in addition to a device particularly suitable for carrying out said method. According to said method, a phase voltage (Uv) on the clamping side on said motor phase is to be detected after clamping a first motor phase (V) from the reference potentials (UZ,M) of an intermediate circuit (7) during a detection period (TE), via which the detection period (TE) determines a peak value (Uv*) of the detected phase voltage (Uv), the peak values (Uv*) are to be compared to the comparative value (Uc), and a positon signal (SP) is to be produced when the peak value (Uv*) exceeds the comparative value (U0).

Abstract: A particularly high level of performance in a sensorless, electronically commutated multiphase electric motor can be achieved, wherein for one full cycle at least, one motor phase is controlled in an asymmetrical manner relative to a further motor phase by controlling a commutation angle of one motor phase by reduction relative to a corresponding commutation angle of the other motor phase. Alternatively or in addition, according to the aforementioned method, at least one motor phase is asymmetrically controlled by reduction by self-reference for a full cycle, a commutation angle being controlled by reduction relative to a preceding or subsequent commutation angle or the size of the intermediate angles between two commutation angles being varied, the reduced commutation angle always being preceded or followed by a measurement angle within which the relevant motor phase is switched at zero current for detecting the rotor position by measuring the counter-electromotive force.

Abstract: The invention relates to a method carried out with simple means for determining the position of the rotor in a sensorless and brushless multi-phase electric motor (1) in addition to a device particularly suitable for carrying out said method. According to said method, a phase voltage (UV) on the clamping side on said motor phase is to be detected after clamping a first motor phase (V) from the reference potentials (UZ,M) of an intermediate circuit (7) during a detection period (TE), via which the detection period (TE) determines a peak value (UV*) of the detected phase voltage (UV), the peak values (UV*) are to be compared to the comparative value (UC), and a positon signal (SP) is to be produced when the peak value (UV*) exceeds the comparative value (U0).

Abstract: The invention specifies a circuit arrangement (1, 20) for controlling a brushless electric motor (37) with a control chip (2), particularly a microcontroller, which has a number of PWM contacts (8), which can be used to output a PWM signal, and a number of commutation contacts (5, 5?, 6, 6?, 7, 7?), which can be used to output a commutation signal. In this case, provision is made for at least one commutation contact (5, 5?, 6, 6?, 7, 7?) to be alternately controllable as an input and an output, for the at least one commutation contact (5, 5?, 6, 6?, 7, 7?) to have its output electrically connected to a PWM contact (8), and for the commutation contact (5, 5?, 6, 6?, 7, 7?) connected in this manner to be able to be contacted for the purpose of tapping off a control signal. Such a circuit arrangement (1, 20) increases the control options for a given control chip (2). The number of PWM sources required is reduced.