Control method of permanent magnet synchronous motor and parameter online identification system

Abstract

The invention relates to a control method of a permanent magnet synchronous motor and a parameter online identification system. The method comprises the steps of: according to to-be-identified specific parameters, applying specific direct-axis and quadrature-axis current in a first time period so as to allow a motor to work in a current closed-loop mode, and measuring the direct axis equivalent voltage; enabling the quadrature-axis current feedback iq to be zero, and calculating to obtain a direct-axis equivalent inductance Ld according to the measurement data in the first time period; drivinga permanent magnet synchronous motor to work according to the obtained direct-axis equivalent inductance Ld; and after the direct-axis equivalent inductance Ld is obtained through calculation according to the measured direct-axis equivalent voltage ud, driving the synchronous motor to work. According to the invention, the influence of nonlinear characteristics such as motor winding resistance anda switch tube dead zone on the identification precision of an electric winding inductor is eliminated; the parameter identification accuracy can be greatly improved; the motor is controlled accordingto the identified parameters, so that the permanent magnet synchronous motor is more stable and better in performance; and the compensation setting of the permanent magnet synchronous motor is more accurate.

Description

technical field [0001] The invention relates to the field of motors, in particular to a control method and an online parameter identification system for a permanent magnet synchronous motor. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) is widely used in CNC machine tools and electronic and electrical fields due to its simple structure, reliable operation, small size, low loss, and high efficiency. The parameters of permanent magnet synchronous motor have an important influence on its application. [0003] In the synchronous motor control system, the motor model parameter direct-axis equivalent inductance L is accurately known d , Quadrature axis equivalent inductance L q , equivalent winding resistance R and equivalent moment of inertia J m The specific value of is of great help to improve the performance of motor control, so it is necessary to have an accurate and reliable method to identify the motor parameters. [0004] The traditional ident...

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Problems solved by technology

[0004] The traditional identification method solves the parameters of the motor model by injecting a sinusoidal excitation signal or other excitation signals with harmonic superposition components at the motor end, and measuring the frequency response curves of the motor input and output. This method identifies the motor as a linear model, but in In practical engineering applications, due to the influence of nonlinear characteristics such as motor friction, winding resistance and switch tube dead zone, the motor model is not linear. Therefore, the measurement results of the identification method using this method often have large errors

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