D-axis positive direction determination method of permanent magnet synchronous motor

Abstract

The invention discloses a d-axis positive direction determination method of a permanent magnet synchronous motor, comprising the steps that firstly a pulsating high frequency current injecting methodis adopted to establish a rotor closed loop system, and the d-axis voltage response is obtained; secondly, the amplitudes of the d-axis voltage response (1) are recorded when the injection current signal phase is pai / 2, 3pai / 2; the value of the two amplitudes are compared, and the d-axis positive direction is determined, and the compensation value of the d-axis positive direction after determination can be obtained. The rotor synchronization rotating coordinates q-axis current can be set as 0, and the d-axis current is injected with a pulsating high frequency sinusoidal signal, and the rotor closed loop system can be established, and the d-axis voltage response of the rotor synchronization rotating coordinates can be extracted. The invention is advantageous in that during the process of determining the d-shaft positive direction, the injected current is always the sine high frequency signal, and signals of other types like positive and negative pulse are not required to be injected, and estimation process can be simplified; motor running cannot be affected; the structure is simple, reliability is high, operation complexity can be reduced, and the process of estimating the initial position can be simplified.

Description

technical field [0001] The invention relates to the field of motors, in particular to a method for judging the positive direction of a d-axis of a permanent magnet synchronous motor. Background technique [0002] For the method of detecting the initial position of the surface-mounted permanent magnet synchronous motor rotor, since the motor rotor is stationary, the initial position of the rotor cannot be estimated by detecting the back EMF of the motor. High-frequency signal injection method. [0003] Liu Ying, Zhou Bo, Li Shuai, et al. Rotor initial position detection of surface-mounted permanent magnet synchronous motor[J]. Proceedings of the Chinese Society for Electrical Engineering, 2011, 31(18): 48-54. Estimation of rotor synchronous rotation coordinates The d-axis of the system injects a high-frequency sinusoidal voltage signal, detects the q-axis high-frequency current response and establishes a position estimation closed loop to obtain the initial estimated value o...

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Problems solved by technology

Liu Ying, Zhou Bo, Zhao Chengliang, et al. Low-speed position sensorless control of SPMSM based on pulsating high-frequency current injection[J]. Chinese Journal of Electrotechnical Society, 2012, 7(27): 139-145. The first use of pulsating high-frequency current injection method to realize the SPMSM rotor position estimation, but there is no mention of how to judge the positive direction of the d-axis

[0004] According to the existing literature review, there is currently no article dedicated to the judgment of the positive direction of the d-axis in the pulse vibration high-frequency current injection method

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