A detection method for orthogonal axis current of permanent magnet synchronous motor
A permanent magnet synchronous motor and current detection technology, which is applied in the control of high-precision electric servo systems and the field of orthogonal axis current detection, can solve problems such as complex calculations and poor robustness, and achieve improved robustness, good detection performance, and reduced The Effect of Algorithmic Complexity
Active Publication Date: 2017-10-17
TSINGHUA UNIV
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[0005] In view of the traditional method of using coordinate transformation to solve the orthogonal axis current in vector control, it is necessary to reliably measure the stator current of each phase, and there are problems such as complex calculation and poor robustness. The present invention proposes a detection method for the orthogonal axis current of a permanent magnet synchronous motor
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[0027] The present invention will be further described below using the accompanying drawings and embodiments. The accompanying drawings described here are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation to the present invention.
[0028] This embodiment takes a two-phase permanent magnet synchronous motor as an example, including A-phase windings and B-phase windings, the two-phase windings are orthogonal in space, and the B-phase lags the A-phase by 90°. The resolver is used as the rotor position sensor, and the controller is TMS320C28x from Texas Instruments (TI). TM A series of digital signal processing chips, which contain a timing interrupt source, and follow the steps below to realize the direct current of the motor i d i q Calculation (flow chart such as figure 1 ):
[0029] (1) The controller that is used to implement described orthogonal axis current detection method,...
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The invention relates to a perpendicular axis current detection method of a permanent magnet synchronous motor, which is characterized in that it includes a zeroing algorithm for the angle range where the orthogonal axis position is located, a judgment method for the direct axis position and the orthogonal axis position, and the speed dynamics according to the change of the angle of rotation Steps to choose a different algorithm. The invention measures the stator phase currents of each phase at the direct axis position and the quadrature axis position respectively, obtains several orthogonal axis currents independently and takes the median value, and realizes the measurement of motor id and iq. The physical concept is clear, no real-time coordinate transformation is required, which reduces the complexity of the algorithm; it is only measured at a specific rotation angle, avoiding the problem that the current is affected by the measurement disturbance during the entire electrical cycle; several orthogonal axis currents that can be measured independently for each phase The median value is taken respectively to avoid abnormal detection caused by current sensor failure and improve the robustness of measurement. According to the speed of the change of the rotation angle, the interpolation or mean value algorithm is dynamically selected, and it has good detection performance in the full speed regulation domain.
Description
technical field [0001] The invention belongs to the technical field of motor control, and relates to a method for detecting a perpendicular axis current of a permanent magnet synchronous motor. The method is suitable for controlling high-precision electric servo systems in aerospace, military equipment and industrial production. Background technique [0002] The current vector control method used in the high-precision electromechanical servo system needs to accurately and real-time detect the rotor position angle θ and the stator current of each phase, and transform the armature current in the stator coordinates into the dq axis current in the rotating coordinates through coordinate transformation to implement control. The usual method requires the current sensor to detect the stator current of each phase accurately and in real time, and uses the Clarke transformation to solve the measured phase current in the stator coordinates to calculate the two-phase AC current i in the ...
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IPC IPC(8): H02P21/16
Inventor 朱纪洪和阳黄玉平
Owner TSINGHUA UNIV