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Method for establishing electromagnetic model of full-parameter permanent magnet motor and parameter identification method

A permanent magnet motor, electromagnetic model technology, applied in the control of generators, motor generator control, control of electromechanical brakes, etc., can solve problems such as failure to achieve control effects, inaccurate electromagnetic models, etc., to reduce the amount of calculation and improve the voltage. Equations, Solving Fast Effects

Active Publication Date: 2021-06-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional electromagnetic model of permanent magnet motor is not accurate and cannot achieve the desired control effect

Method used

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  • Method for establishing electromagnetic model of full-parameter permanent magnet motor and parameter identification method
  • Method for establishing electromagnetic model of full-parameter permanent magnet motor and parameter identification method
  • Method for establishing electromagnetic model of full-parameter permanent magnet motor and parameter identification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A method for establishing an electromagnetic model of a full-parameter permanent magnet motor, such as figure 1 shown, including:

[0065] The d-axis flux linkage equation of the permanent magnet motor is established based on the excitation effect of the permanent magnet flux linkage and the d-axis current and the saturation effect; in the d-axis flux linkage equation, the d-axis flux linkage ψ d With -i d decreases with the increase of q-axis current i q increases with the increase of ; among them, i d Indicates the d-axis current; in this embodiment, the direction of the permanent magnet flux linkage is specified to be the positive direction, i d When it is positive, it means that the d-axis current is in the same direction as the permanent magnet flux linkage, i d When it is negative, it means that the d-axis current is opposite to the direction of the permanent magnet flux linkage; in the control process of the permanent magnet motor, i d ≤0, play the role of m...

Embodiment 2

[0097] A computer-readable storage medium, including a stored computer program; when the computer program is executed by a processor, the device where the computer-readable storage medium is located is controlled to execute the method for establishing an electromagnetic model of a full-parameter permanent magnet motor provided in Embodiment 1 above.

Embodiment 3

[0099] A parameter identification method for the electromagnetic model of a full-parameter permanent magnet motor, such as figure 2 As shown, the electromagnetic model is established by the establishment method of the full-parameter permanent magnet motor electromagnetic model provided by the above-mentioned embodiment 1;

[0100] The parameter identification method provided in this embodiment includes:

[0101] Establish a thermal network model: establish a thermal network that includes at least five nodes: the slot winding, the end winding, the stator, the rotor and the bearing;

[0102] The thermal network considers the heat conduction and heat convection of the permanent magnet motor, and ignores the heat radiation with very little heat transfer; therefore, the thermal resistance between nodes is divided into conduction thermal resistance and convective thermal resistance, and the conduction thermal resistance is generally constant, such as the stator and winding This th...

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Abstract

The invention discloses a method for establishing an electromagnetic model of a full-parameter permanent magnet motor and a parameter identification method, and belongs to the field of motor control. The establishing method comprises the steps of correcting a flux linkage equation according to the influence of a saturation effect on a permanent magnet flux linkage, and on the basis, according to the influence of temperature on the permanent magnet flux linkage and stator resistance, further correcting the flux linkage equation and a voltage equation. The parameter identification method comprises the steps of establishing a thermal network by taking key components in the motor as nodes, calculating loss which obviously generates temperature rise in the motor according to a corrected electromagnetic model, distributing the loss to each node to serve as a heat source, comprehensively considering thermal resistance between the nodes and the heat source of each node, and establishing a heat transfer equation; and establishing an objective function according to the established equation, and solving the minimum value of the objective function through a temperature rise experiment, thereby identifying all the parameters to be identified in the heat transfer equation. According to the invention, the precision of the electromagnetic model is improved, the thermal network capable of accurately reflecting the thermal behavior of the motor is established, and the problem of parameter identification is solved.

Description

technical field [0001] The invention belongs to the field of motor control, and more specifically relates to a method for establishing an electromagnetic model of a full-parameter permanent magnet motor and a method for parameter identification. Background technique [0002] In recent years, the shortage of non-renewable energy and environmental pollution have become increasingly prominent, and governments of various countries have begun to attach importance to the development of new energy industries. Under the background of energy saving, emission reduction and green environmental protection, permanent magnet motors are more and more widely used in electric vehicles, high-speed railways, aerospace and other fields due to their superior performance such as high power factor and high efficiency, and are gradually moving towards high Power density and high reliability direction. [0003] In the control process of the permanent magnet motor, it needs to depend on parameters s...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/14H02P21/16
CPCH02P21/00H02P21/141H02P21/16
Inventor 范兴纲曲荣海曹龙飞李大伟
Owner HUAZHONG UNIV OF SCI & TECH
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