Research on Distributed Parameter Model of Permanent Magnet in Robust Design of Electromagnetic Relay

Huimin LIANG  Jiaxin YOU  Zhaowen CAI  Guofu ZHAI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.12   pp.1142-1149
Publication Date: 2014/12/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.1142
Type of Manuscript: PAPER
Category: Electronic Components
Keyword: 
magnetic field line based equivalent distributed parameter model (MFDPM),  magnetic equivalent circuit method (MEC),  analytical method,  electromagnetic relay,  reliability engineering,  

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Summary: 
The reliability of electromagnetic relay (EMR) which contains a permanent magnet (PM) can be improved by a robust design method. In this parameter design process, the calculation of electromagnetic system is very important. In analytical calculation, PM is often equivalent to a lumped parameter model of one magnetic resistance and one magnetic potential, but significant error is often caused; in order to increase the accuracy, a distributed parameter calculation model (DPM) of PM bar is established; solution procedure as well as verification condition of this model is given; by a case study of the single PM bar, magnetic field lines division method is adopted to build the DPM, the starting point and section magnetic flux of each segment are solved, a comparison is made with finite element method (FEM) and measured data; the accuracy of this magnetic field line based distributed parameter model (MFDPM) in PM bar is verified; this model is applied to the electromagnetic system of a certain type EMR, electromagnetic system calculation model is established based on MFDPM, and the static force is calculated under different rotation angles; compared with traditional lumped parameter model and FEM, it proves to be of acceptable calculation accuracy and high calculation speed which fit the requirement of robust design.