Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer elektrischen Maschine (2), insbesondere eines Kraftfahrzeugs, wobei die Maschine (2) einen drehbar gelagerten Rotor und eine Motorwicklung aufweist, wobei die Motorwicklung durch eine Leistungselektronik (3) elektrisch mit einem elektrischen Energiespeicher (4) verbunden ist, und wobei die elektrische Maschine (2) durch Ansteuern der Leistungselektronik (3) derart feldorientiert geregelt wird, dass die Maschine (2) ein vorgegebenes Soll-Drehmoment (Tsoll) erzeugt. Es ist vorgesehen, dass bei Erkennen, dass ausgehend von einem aktuellen Ist-Arbeitspunkt (AP1) der elektrischen Maschine (2) ein vorgegebener Soll-Arbeitspunkt (AP2) der elektrischen Maschine (2) zumindest im Wesentlichen zeitoptimiert eingestellt werden soll, eine prädizierte Vorsteuerung vorgegeben wird, und dass der Soll-Arbeitspunkt (AP2) durch Ansteuern der Leistungselektronik (3) in Abhängigkeit von der prädizierten Vorsteuerung eingestellt wird.
Abstract:
Systems and methods for reducing current imbalance in a motor, where one embodiment comprises a system having an ESP installed in a well, an electric drive, and a power cable coupled between the drive and the ESP's motor. The electric drive generates output voltage waveforms for multiple phases that may have different impedances. The system monitors the current of each phase at the output of the electric drive and determines a current imbalance between the phases. The drive generates voltage adjustments (e.g., duty cycle adjustments) corresponding to the respective phases, and applies each voltage adjustment to the corresponding voltage waveform. For example, the drive may determine an average of the phase currents, determine the difference between each phase current and the average, and multiply the result by a gain factor to generate the voltage for each phase. The process is iteratively performed to reduce the current imbalance.
Abstract:
L'invention concerne un procédé d'estimation du couple électromagnétique d'une machine électrique synchrone triphasée à aimants permanents, où : on mesure les courants et tensions de phases du stator dans un repère triphasé fixe lié au stator, on détermine ces courants et tensions dans un repère diphasé tournant lié au rotor en fonction desdites mesures, on détermine un modèle flux-courant statorique, prenant en compte des fonctions de saturation de la machine, pour considérer dans le modèle des variations de paramètres magnétiques de la machine causées par la saturation magnétique de la machine, on introduit dans le modèle des variables d'état décrivant les incertitudes paramétriques inhérentes aux variations des paramètres magnétiques de la machine, on estime lesdites variables d'état par un observateur fonction des courants et des tensions statoriques exprimés dans le repère diphasé, on calcule le couple électromagnétique à partir du flux statorique calculé à partir de l'estimation desdites variables d'état.
Abstract:
A method for controlling an electric drive comprising a step of measuring the angle φ between the voltage Vf applied at least to a phase of an electric motor forming part of the electric drive and the respective phase current If, a step of indirectly measuring the phase current If in the phase and, given a vector diagram of an equivalent circuit of the phase of the electric motor, a step of calculating the angle γ between the counter- electromotive force Emf and the phase current If defining a reference system comprising an axis X having direction of the current phase If and an axis Y at right angles to the axis X.
Abstract:
A vehicle system (10) is provided. The vehicle system comprises an electrical DC motor (11) driving a load (12), such as a hydraulic pump, and a control system (100) for controlling the speed of the electrical motor (11). The control system (100) comprises a system (20) for monitoring and controlling the speed of the electric DC motor in view of a reference commutation signal (S R ), wherein the electrical DC motor is associated with a drive current signal (I D ), and wherein the drive current signal (I D ) comprises information relating to the commutation signal of the electrical DC motor. The system (20) comprises a speed estimation unit (23) for estimating a commutation signal (S E ) from the drive current signal (I D ), said commutation signal (S E ) corresponding to an estimated motor speed; a filter unit (25) configured to apply a first filter on the drive current signal (I D ), said first filter being selected based on the estimated commutation signal (S E ), thereby resulting in a filtered drive current signal, and a speed detector unit (26) for detecting the actual commutation signal (S M ) from the filtered drive current signal. If the detection of the commutation signal (S M ) is unsuccessful the speed estimation unit (23) is based upon the receipt of a signal (S M-NO ) from the speed detector unit (26) configured to transmit an estimated commutation signal (S E ) to a control unit (28), wherein the control unit (28) is configured to provide a control signal comprising information of a comparison between the reference commutation signal (S R ) and the estimated commutation signal (S E ) and indicating a required updated drive signal (I D ).
Abstract:
The present invention relates to the technical field of controlling converters. The invention relates to a control system (2) and a method for controlling a converter (1) in particular used for single-phase traction applications. The control system (2) comprising a voltage controller (18) for controlling an output DC-voltage of the AC-/DC converter (1) to a reference output DC-voltage of the AC-/DC converter (1); a current controller (19) for controlling a line current to a reference line current of the AC-/DC converter (1); an observer (14) connected to the voltage controller (18) in order to estimate an offset of an output DC-voltage of the AC-/DC converter (1) from a reference output DC-voltage due to disturbances caused by a grid (6) connected to the AC-/DC converter (1) entering the AC-/DC converter (1); and that the voltage controller (18) and / or current controller (19) of the control system (2) having a logic model that is Model Predictive Control to predict the dynamic behavior of the AC-/DC converter (1) influenced by the disturbances caused by the grid (6) entering the AC-/DC converter (1) and in order to generate an input voltage or an input current for the AC-/DC converter (1) to compensate for deviations of the output DC-voltage or the line current of the AC-/DC converter (1) from a reference output DC-voltage or a reference line current due to disturbances caused by the grid (6) entering the AC-/DC converter (1) in an operative state of the AC-/DC converter (1).
Abstract:
A control device (11) for controlling an electric machine (22) with ks windings on a stator and kr windings on a rotor, wherein ks+ kr = n and wherein either one of ks and kr may be zero, comprises an input via (12) which control commands are capable of being received in real-time and an output (14) via which control commands to a driver (21) of the electric machine are capable of being output in real-time; machine modeling means (15) provided for modeling the behavior of the electric machine in real-time; and decision means (16) operatively connected to the input, the output, and the machine modeling means and, in real-time, provided for (i) determining the control commands to be output to the driver of the electric machine based on input control commands and results from the modeling of the behavior of the electric machine, and (ii) outputting the determined control commands at the output. -The machine modeling means is provided for modeling the behavior of the electrical machine through at least one functional mapping suited for correlating sets of values of electrical and mechanical quantities and/or sets of values of their total or partial derivatives and/or integral functions with one another, wherein the electrical and mechanical quantities comprise winding currents, winding voltages, magnetic fluxes, mechanical displacements, and/or electromagnetic torques or forces; and the functional mapping comprised of at least one algorithm and/or mathematical equation based on at least one state function associated with the electromagnetic field inside the electrical machine and/or based on at least one partial derivative of said state function.
Abstract:
The invention relates to a method for correcting a measured value of an angle of rotation (153) of the rotor of an electric machine, in particular of the rotor of a synchronous machine (155), wherein the method comprises the following steps: measuring a value of a sensor signal, wherein the value of the sensor signal is indicative of an angle of rotation (153) of the rotor; calculating the angle of rotation (153) of the rotor on the basis of the measured value of the sensor signal; determining a correction value (105) in accordance with the calculated angle of rotation of the rotor and from a correction table (106) determined in advance on the basis of the angle of rotation of the rotor; correcting (111) the measured value of the sensor signal (101) by the determined correction value (105); determining the correction value (105) by comparing an actual angle-of-rotation curve with an ideal angle-of-rotation curve; and storing (109) the difference between the actual angle of rotation and the ideal angle of rotation as a correction value (105) in the correction table (106).
Abstract:
Die Erfindung betrifft ein Verfahren zum sensorlosen Bestimmen einer Läuferlage (φ el ) zum Betreiben einer elektronisch kommutierten elektrischen Maschine (2), mit folgenden Schritten: - Bestimmen einer induzierten Spannung (U ind ) in Spulen der elektrischen Maschine (2) aus einem oder mehreren Maschinenströmen und Maschinenspannungen; und - Schätzen der Läuferlage (φ el ) und /oder einer Geschwindigkeitsangabe ( ω el )aus einer Abweichung (ΔU ind ) der induzierten Spannung (U ind ) von einer geschätzten induzierten Spannung (Û ind ).