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Analysis method of the influence of harmonics on the running state of three-phase induction motor

A technology of induction motor and operating state, applied in the field of analysis of the influence of operating state, can solve the problems of grid voltage distortion, harmonic aggravation, operation stability and efficiency drop of three-phase induction motor, etc.

Active Publication Date: 2021-03-02
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

With the development of power electronics technology, power quality problems such as voltage distortion and harmonics in the power grid have intensified, resulting in a decrease in the stability and efficiency of three-phase induction motors

Method used

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  • Analysis method of the influence of harmonics on the running state of three-phase induction motor

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Embodiment Construction

[0074] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

[0075] Step S1, steps such as figure 1 As shown, in the Maxwell finite element simulation software, a 2D electromagnetic finite element model of a three-phase induction motor with different air gap widths and the same output capacity is established with the specific structural parameters of the three-phase induction motor. In the solidworks design software, the 3D stator structure mo...

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Abstract

The invention relates to the technical field of running state analysis, in particular to a method for analyzing the influence of harmonic waves on the running state of a three-phase induction motor. According to the method, a three-phase induction motor is used as a research object, a two-dimensional electromagnetic field model of a generator is established by utilizing finite element software, and a fitting formula which takes the efficiency eta of the three-phase induction motor as a dependent variable and takes a harmonic content UHCi, an air gap width [delta] and a torque change relative value [Delta]T as independent variables is obtained. The efficiency of the motor can be calculated more visually and accurately, and the method provided by the invention is more suitable for practicalindustrial application.

Description

technical field [0001] The present invention relates to the technical field of running state analysis, and more specifically, to a method for analyzing the influence of harmonics on the running state of a three-phase induction motor. Background technique [0002] According to statistics, 60% of my country's annual power generation is used for motors, and 90% of it is consumed by induction motors. Three-phase asynchronous motors are widely used in agricultural farming machinery such as machine tools, water pumps, and blowers. With the development of power electronics technology, power quality problems such as voltage distortion and harmonics in the power grid have intensified, resulting in a decrease in the stability and efficiency of three-phase induction motors. Therefore, analyzing the influence of harmonics on the operating efficiency of three-phase induction motors is of great significance for how to improve the efficiency and stability of three-phase induction motors w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R23/16
CPCG01R23/16G01R31/343
Inventor 刘贺陈子辉吴智影刘勇浩李辰盟杨玺叶伟玲何兴华倪惠浩许巧云
Owner GUANGDONG POWER GRID CO LTD
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