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Method for identifying electrical parameters of permanent magnet motor

A permanent magnet motor and electrical parameter technology, which is applied to electrical components, control generators, motor control, etc., can solve problems such as large amount of calculation, degradation of controller performance, and influence on motor stability, and achieve the effect of improving identification accuracy

Pending Publication Date: 2022-05-13
HUAZHONG UNIV OF SCI & TECH
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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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  • Method for identifying electrical parameters of permanent magnet motor
  • Method for identifying electrical parameters of permanent magnet motor
  • Method for identifying electrical parameters of permanent magnet motor

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[0070] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0071] In order to deal with the above challenges, it is necessary to introduce a parameter identification link into the control system of the permanent magnet motor. The parameter identification link collects the state information of the motor, such as voltage, current, speed and other information, and then reconstructs the state of the motor through a specific algorithm to obtain the parame...

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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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/13H02P21/22H02P25/022
CPCH02P21/14H02P21/13H02P21/22H02P25/022H02P2207/05
Inventor 杨凯姜峰杨帆柳岸明孙宋君罗成
Owner HUAZHONG UNIV OF SCI & TECH
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