Abstract:
Method for determining the rotor position of a synchronous machine with field-oriented control which has an effective inductance which is dependent on the rotor position, wherein the motor current is detected and the motor voltage is set using a pulse width modulation method, wherein a signal which is synchronous to the pulse width modulation frequency is superimposed on the motor voltage value to be set, wherein values for the motor current are detected in synchronism with the pulse width modulation frequency, wherein a current component brought about by the superimposed voltage signal and a residual current component, i.e. the fundamental component, are determined, wherein an estimated rotor angle position is determined from the current component brought about by the superimposed voltage signal, the phase angle of said rotor angle position being reduced with respect to the actual rotor angle position by means of a flux model, wherein the residual current component is supplied to a current regulator.
Abstract:
Open-loop or closed-loop control method for a converter which feeds an electric motor, wherein a current space vector is detected as the motor current and the motor voltage, in particular a voltage space vector, is set, wherein an induced voltage space vector (Formula A) is determined, which is supplied to an integrating element, a flux space vector is produced, the angle of which is at right angles to the voltage space vector, wherein the magnitude of the flux space vector corresponds to a predetermined rated value, and the difference between the integration result and the flux space vector produced in this way is used as feedback for the integration element.
Abstract:
Method for determining the rotor angle of a synchronous machine, in particular using only a single two-component or three-component current measuring channel, and drive for carrying out the method, in particular wherein the synchronous machine has a stator inductance that is dependent on the rotor position, wherein an inverter supplies the stator of the synchronous machine with a pulse-width-modulated three-phase voltage which can be identified by a voltage space vector for each half of a pulse width modulation period, wherein the motor current is measured and is used to form an associated motor current space vector and, at least on the basis thereof, the voltage space vector is determined at least for a particular pulse width modulation period, wherein the voltage space vector is composed of a component associated with a fundamental component and of a component associated with a carrier signal at a higher frequency than the fundamental component, wherein the carrier signal is in the form of a periodic signal, the period duration of which is an integer multiple of the pulse width modulation period, in particular is at least two or three times the pulse width modulation period, wherein the carrier signal is a binary signal, wherein the carrier signal has a pattern without average values, in particular when averaging over the period duration of the carrier signal, wherein the carrier signal can be clearly identified by virtue of a voltage value being associated with each half of a pulse width modulation period, wherein the fundamental component of the voltage space vector is constant during the period duration of the carrier signal, wherein the current component associated with the fundamental component and the current component associated with the carrier signal are determined from the measured current values.
Abstract:
The invention relates to a method and a device for controlling a synchronous motor which is separately excited by an excitation winding, said excitation winding being supplied with a unipolar current on to which an additional signal is superimposed.
Abstract:
Disclosed are a method and a system for determining the position of a first part of an electric motor relative to a second part thereof. The magnetic field strength generated or at least influenced by magnets of the second motor part is determined at several points on the first motor part, and the relative position of the second motor part to the first motor part is determined from the determined magnetic field strength. The magnetic field strength is locally determined at several points of the first motor part, said points being at a distance from one another in the direction of movement. Each point is assigned to one of at least two groups. A respective signal value is determined, by a majority decision, from the determined values that are part of one group, the position being determined from the signal values.