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Solution of the electromagnetic noise produced from small electric appliance by real-time parallel measurements

实时并行测量解决小电器产生的电磁噪声

基本信息

批准号：
11834003
负责人：
NEMOTO Yoshiaki
金额：
$ 2.24万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11834003/
关键词：
electromagnetic noise noise control small electric appliance electric contact arc discharge electrode surface burst noise trace of discharge 整流子モータ

项目摘要

The purpose of the project is contro1 of electromagnetic noise generated from small electric appliances. A real-time parallel measurement system was developed for synthetic analysis of the phenomena of discahrge and noise generation of electric contacts. A progressive idea in this experiment is analysis of relationship of noise generation to the trace of arc discharge on the electrode surface. The conducting noise on the power line was measured for breaking contacts of two types. One is a Cu-C moving electric contact which simulates a pair of a commutator (Cu) and a brush (C) in a commutator motor in a small electric appliance, and the other is a Ag-Pd contact as a general heterogeneous electric contact.Waveforms of noise, voltage and current across the electric contact, and surface photograph of the electrode are measured in a simultaneous parallel way to analyze APD (amplitude probability distribution) of noise and the correlation in discharge phenomena. The phenomena of noise generation is classified into two patterns which are sporadic and continuous burst noise types depending on material condition. When a sporadic burst noise occurs, the trace of discharge on the electrode surface is formed in the noise duration, and we proposed that noise generation would be controllable by controlling formation of the discharge trace. When continuous noise occurs, the duration of large noise has correlation with the area or the discharge trace on the cathode surface for C-Cu, or the area of different color on the anode for Ag-Pd, respectively, and we proposed that arc duration should be controlled.An experiment showed that the noise duration could be reduced, by reducing the contact surface of electrodes for the sporadic burst noise, or by making the electrode thick in the case of the continuous burst noise. The result shows that the proposal that design of electrode shape is important in control of noise generation.

本项目的目的是控制小家电产生的电磁噪声。为综合分析电触头放电和噪声产生的现象，研制了一套实时并行测量系统。本实验的一个进步思想是分析了噪声产生与电极表面弧光放电痕迹的关系。测量了两种类型断路器在电力线上的传导噪声。一种是模拟小家电换向器电机中一对换向器(铜)和一对电刷(C)的铜碳移动电触头，另一种是银钯触头，它是一种普通的异质电触头。通过同时平行测量电接触的噪声、电压和电流波形以及电极表面的照片，分析了噪声的幅值概率分布及其在放电现象中的相关性。根据材料条件的不同，噪声产生现象可分为零星爆发噪声和连续爆发噪声两种。当出现零星的脉冲噪声时，电极表面的放电痕迹是在噪声持续时间内形成的，我们提出了通过控制放电痕迹的形成来控制噪声的产生。当出现连续噪声时，大噪声的持续时间分别与C-Cu的阴极表面面积或放电轨迹或Ag-Pd的阳极上不同颜色的面积相关，并提出了控制电弧持续时间的建议。实验表明，对于零星的脉冲噪声，可以通过减小电极的接触面来减少噪声持续时间，对于连续的脉冲噪声，可以通过增加电极的厚度来减少噪声持续时间。结果表明，电极形状的设计是控制噪声产生的重要因素。