Title :
Permanent-Magnet Equivalent Model of Calculating Relay´s Static Attractive Torque Characteristics by Finite Element Method
Author :
Guofu, Zhai ; Qiya, Wang ; Wenying, Yang ; Liang Huimin
Author_Institution :
Sch. of Electr. Eng. & Autom., Harbin Inst. of Technol., Harbin, China
Abstract :
The permanent magnet (PM) is the key part of the relay. This paper aims to solve the problem of the uneven magnetization for the PM with nonlinear demagnetization curve after magnetizing and demagnetizing. A method partitioning the PM along the magnetization direction and the vertical direction of magnetization according to the condition of the specific magnetization of the PM was presented. By this method, the demagnetization model of the PM was built, the state of the PM magnetization was simulated under the demagnetizing magnetic intensity, and the recoil line and its initial point of each partition of the PM were obtained. Then the characteristic of the recoil line of each partition was used as its magnetic characteristic for the equivalent model of the PM to calculate the static torque characteristics under the demagnetizing magnetic field. Finally, the static torque characteristics of simulation and experiment were compared and the validity of the equivalent model presented was verified.
Keywords :
demagnetisation; finite element analysis; magnetisation; permanent magnets; relays; torque; finite element method; magnetic intensity demagnetizing; nonlinear demagnetization curve; permanent magnet equivalent model; recoil line; relay static attractive torque characteristics; uneven magnetization direction; vertical magnetization direction; Coils; Demagnetization; Finite element methods; Magnetic hysteresis; Magnetization; Relays; Torque; Equivalent model; finite element method (FEM); permanent magnet (PM); relay; static attractive torque characteristics;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2012.2196705
