Method for identifying electrical parameters of permanent magnet motor

Abstract

The invention provides a permanent magnet motor electrical parameter identification method, which comprises the following steps: S1, establishing a d-axis and q-axis current state equation taking resistance and inductance as inaccurate factors according to a voltage equation of a permanent magnet motor; s2, establishing a d-axis and q-axis centralized disturbance model, establishing a d-axis and q-axis expansion state observer, and obtaining observation values of unknown disturbance of d-axis and q-axis; obtaining an identification result of unknown disturbance; s3, obtaining a first identification equation of stator resistance and d-axis and q-axis inductance; s4, compensating the first identification result to obtain a second identification result; and S5, filtering the second identification result. The difference of dynamic characteristics of different electrical parameters is considered through the steps, modeling is carried out on the problem that the electrical parameters are inaccurate, and equation solving is achieved through time division multiplexing of an identification equation. Meanwhile, because the non-linear problem of the inverter can obviously influence the identification precision of the electrical parameters, the method also carries out compensation calculation on the identification result, so as to improve the identification precision of the electrical parameters.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for identifying electrical parameters of a permanent magnet motor. Background technique [0002] Permanent magnet synchronous motors have the advantages of high torque density, high efficiency, and good speed regulation performance. They are widely used in CNC machine tools, electric traction drives, aerospace, national defense and military industries that have high requirements for performance and efficiency. A typical permanent magnet synchronous motor control system topology consists of an outer speed loop and an inner current loop. The speed loop calculates the current command of the inner loop according to the speed command and the speed feedback value. Therefore, the control performance of the speed loop directly determines the Motor speed regulation performance. [0003] Under complex operating conditions, the permanent magnet motor drive system inevitably ...

AI Technical Summary

Problems solved by technology

Changes in these electrical parameters during operation will lead to a decrease in the performance of the controller, thereby affecting the stability of the motor during operation; the common parameter identification methods in the existing calculation methods include the least squares method, the model reference adaptive method, the extended Karl Mann filter method, affine projection method, etc. These types of methods generally have problems such as large amount of calculation and insufficient convergence speed; and because the nonlinear problem of the inverter will significantly affect the identification accuracy of the system for the above electrical parameters, it is not necessary to Conducive to the optimization of permanent magnet motor drive system

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