The control method and parameter online identification system of permanent magnet synchronous motor

Abstract

The invention relates to a control method of a permanent magnet synchronous motor and an online parameter identification system. The method includes: according to the specific parameters to be identified, applying a specific quadrature-axis current in the first period of time, making the motor work in a current closed-loop mode, and measuring the direct-axis equivalent voltage; making the quadrature-axis current feedback i q is zero, the direct-axis equivalent inductance L is calculated according to the measurement data in the first period d ; According to the obtained direct axis equivalent inductance L d Drive the permanent magnet synchronous motor to work. According to the measured direct axis equivalent voltage u d Calculate the direct axis equivalent inductance L d After driving the synchronous motor to work, this method eliminates the influence of nonlinear characteristics such as motor winding resistance and switch tube dead zone on the identification accuracy of electric winding inductance, which can greatly improve the accuracy of parameter identification. The control can make the permanent magnet synchronous motor 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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