Rectangular-axis current detection method for PMSM
A permanent magnet synchronous motor and current detection technology, applied in the control field of orthogonal axis current detection and high-precision electric servo system, can solve the problems of poor robustness and complicated calculation, and achieve improved robustness, good detection performance, physical clear concept effect
Active Publication Date: 2016-08-03
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 internal timing interrupt service program of the controller takes a cycle T s Sampling ...
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The invention relates to a rectangular-axis current detection method for a PMSM. The method is characterized by dynamically selecting different algorithms according to the return-to-zero algorithm within a rational degree range containing a rectangular axis, the location of a direct axis, the location of a quadrature axis and the fast and slow dynamics of the corner variation. According to the technical scheme of the invention, the currents of each stator phase at the position of the direct axis and the position of the quadrature axis are respectively measured, and several mutually independent rectangular-axis currents are acquired. After that, the median values of the several currents are calculated, so that the id and the iq of the PMSM are measured. The method is clear in physical concept, free of real-time coordinate transformation and lower in algorithm complexity, wherein the measurement is conducted only at specific angles. Therefore, the problem that the detection is influenced by the measurement disturbance of the current during the entire power period can be solved. The median values of several mutually independent rectangular-axis currents are respectively calculated, and the abnormal detection condition caused by the fault of a current sensor is avoided. The measurement robustness is improved. Moreover, the interpolation algorithm or the mean algorithm is selected according to the fast and slow dynamics of the corner variation. As a result, the method is good in detection performance in the entire speed-control 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
Owner TSINGHUA UNIV