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Design method of common-mode electromagnetic interference filter for motor drive system

A motor drive system, electromagnetic interference technology, applied in the direction of instrumentation, calculation, electrical digital data processing, etc., can solve the problem that the optimal topology cannot be selected, and achieve the effect of accurate design

Active Publication Date: 2018-07-13
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the accuracy of filtering effect prediction, the impedance of interference sources and interference loads can be considered in filter design. This type of method can calculate the parameters of filter components for pre-specified filter topologies with fewer components, but cannot choose Optimal topology, and not suitable for complex system impedance characteristics or application of high-order filters

Method used

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  • Design method of common-mode electromagnetic interference filter for motor drive system
  • Design method of common-mode electromagnetic interference filter for motor drive system
  • Design method of common-mode electromagnetic interference filter for motor drive system

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Experimental program
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Embodiment

[0145] In this embodiment, the method of the present invention is used to design input and output side common mode filters for a motor drive system.

[0146] The motor drive system includes 1 commercial DC power supply, 3 30kW motor controllers, 4 20kW permanent magnet synchronous motors, 2 line impedance stabilization networks (manufactured by Schwarzbeck, Germany, model NNLK8130), and 5 electromagnetic interference receivers (produced by Rohde&Schwarz in Germany, model ESL3), one coaxial cable with characteristic impedance 50Ω, and several other power cables for power transmission. Without a filter, the motor drive system is connected as figure 2 shown.

[0147] (1) Determine the impedance characteristics of the main equipment and components in the EMC test of the motor drive system

[0148] The impedance characteristics of the line impedance stabilization network 2 are obtained by calculation as image 3 Shown; Obtain the impedance characteristic of permanent magnet syn...

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Abstract

A design method for a common-mode electro-magnetic interference filter for a motor drive system is disclosed. The common-mode filter is designed based on a transfer function; a common-mode interference source, an interference transmission path and sensitive equipment impendence are taken into consideration quantitatively in topology selection and parameter design of the filter; a target voltage transfer function of different filter topologies is determined according to a reference limit value specified by a voltage source frequency spectrum and electromagnetic compatibility standard firstly; then a filter element value for enabling a minimum deviation between the filter design transfer function and the target transfer function is determined based on a nonlinear least square method; and filter structure and elements finally adopted by the motor drive system are determined according to realizability and operability.

Description

technical field [0001] The invention relates to a common-mode electromagnetic interference filter for a motor drive system. Background technique [0002] Electromagnetic compatibility problems widely exist in various electrical systems, especially in power electronic equipment and systems. In order to suppress the electromagnetic interference conduction emission caused by the high-frequency switching action of power devices, it is usually necessary to install an electromagnetic interference filter, hereinafter referred to as an EMI filter. Currently, commonly used EMI filter design methods include: [0003] 1. Repeatedly try different component parameters through experiments [0004] This method is currently the most commonly used, and its advantage is that the design effect can be seen at a glance. But the disadvantages are also obvious, that is, the design results come from trial and error, which can neither guarantee the design speed nor whether the design is optimal. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/327
Inventor 张栋宁圃奇温旭辉
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI