7 results about "Flux vector" patented technology

Method for operating an electric motor in which a flux sensor of a control electronics determines a stator flux vector depending on a predetermined torque requirement, a voltage sensor of the control electronics determines a scaled stator voltage vector depending on the determined stator flux vector, an inverter of the control electronics switches an electrical DC voltage provided by an intermediate circuit depending on the determined scaled stator voltage vector and generates a multi-phase AC voltage by means of the switching, and the control electronics operate an electric motor by applying the generated multi-phase AC voltage; as well as control electronics for an electric motor.

The invention relates to a method and a device for tracking a minimum torque per ampere condition for controlling an electrical machine using direct flux vector control. The invention: - determines a torque reference; - determines a provisional flux target from the torque reference using a torque-flux dependency rule; - determines a flux target by adding a low frequency flux signal to the provisional flux target; - controls the electrical machine using direct flux vector control according to the flux target; - measures the current provided to the electrical machine at at least three time events, which are times at which the low frequency flux signal has different values; - estimates a maximum torque per ampere flux from the measured currents; - updates the dependency rule according to the estimated maximum torque per ampere flux.

A device and a method control a motor using a maximum torque per ampere field module and a direct flux vector control module. The method: determines by the direct flux vector control module reference voltages in a fτ framework; drives the motor with the summed voltages; measures a motor current vector; determines a high frequency injection voltage so that the high frequency current response of the motor to the high frequency injection voltages is perpendicular to the measured motor current vector; determines an estimated flux from the measured motor currents and the voltage references; and determines, from the estimated flux and the high frequency sinewave signal, the reference flux so that the high frequency flux response to the injected voltage is aligned with the measured current vector.

A device and a method for controlling a motor using a DFVC module and a CCAL module. The invention: determines a torque reference, determines, by the CCAL module, a flux reference and a current reference from the torque reference and a predetermined angle, provides the flux reference and the current reference to the DFVC module in order to obtain a reference voltage to be provided to the motor, injects a high frequency signal on the reference voltage, determines, from motor current vector, an estimate of the direction of a flux of the motor, determines, from the estimate of the direction of the flux, an estimate of a flux and an estimate of the current that flows perpendicular to the estimated direction of the flux, provides the estimate of the flux and the estimate of the current that flows perpendicular to the estimated direction of the flux to the DFVC module.

The invention provides a stator flux linkage oriented induction motor model predictive current control method, which comprises the following steps: acquiring a d-axis stator current feedback value and a q-axis stator current feedback value according to a stator flux linkage vector and a stator flux linkage orientation strategy of an induction motor; a d-axis stator current reference value and a q-axis stator current reference value are generated through a rotating speed controller and a flux linkage controller; sequentially substituting the plurality of candidate voltage vectors into the established discrete prediction model, obtaining a d-axis stator current prediction value and a q-axis stator current prediction value by combining the d-axis stator current feedback value and the q-axis stator current feedback value, and calculating a value function value corresponding to each candidate voltage vector by combining the d-axis stator current reference value and the q-axis stator current reference value; and selecting the candidate voltage vector with the minimum value function value as the optimal voltage vector to drive the induction motor to operate. According to the method, the flux linkage orientation precision can be improved, and the robustness of a control system facing parameter changes is enhanced.

The model predictive current control method for induction motor based on generalized flux error and closed-loop flux-weakening strategy belongs to the field of induction motor speed regulation control.The method solves the problems that the existing control method cannot simultaneously meet the conditions of not needing to add an additional flux-weakening weight factor in the value function,not depending on motor parameters,being able to perform closed-loop control and not causing the current following error to increase under single-vector model predictive current control.The method specifically comprises the following steps: step one, defining a generalized flux vector reference value and a generalized flux prediction value, and obtaining the relationship between a basic generalized flux vector and a basic voltage vector according to the generalized flux prediction value; step two, obtaining a value function of single-vector model predictive current control for the induction motor according to the result of step one; and step three, obtaining an optimal voltage vector according to the value function, and generating a flux-weakening current component to perform compensation according to the basic generalized flux vector corresponding to the optimal voltage vector.The method can be applied to model predictive current control for the induction motor.

A method for calculating an angle of the inductor flux vector, comprising a plurality of iterations, each iteration of the plurality of iterations except the first comprising: a / obtaining (S100) input data including armature voltage values, armature current values, armature resistance values, and armature inductance values; b / estimating (S101) the inductor flux vector of the iteration by adding to an inductor flux vector obtained in the previous iteration a function of said input data; c / a correction comprising i. determining (S102) the center of a circle passing through at least three points defined by the flux vector obtained by said estimation, and at least two flux vectors obtained in two preceding iterations; and ii. obtaining the flow vector of the current iteration in which we correct (S106, S107) the flow vector obtained by said estimation using said center vector.Figure for the abridged version: [Fig. 2].