Three-dimensional analytical calculation method for electromagnetic torque of permanent magnet eddy current coupling

Abstract

The invention provides a three-dimensional analytical calculation method for electromagnetic torque of a permanent magnet eddy current coupling. The three-dimensional analytical calculation method includes the steps: based on a sub-domain method electromagnetic field calculation model, firstly, enabling a permanent magnet eddy current coupling to be equivalent to four sub-domains of a permanent magnet array, an air gap, a conductor and a conductor back iron under a rectangular coordinate system; then calculating specific forms of coefficients related to the harmonic order in the magnetic vector potential expressions of the conductor and the conductor back iron field domain; and finally, obtaining an electromagnetic torque value under the given air gap and slip ratio. According to the three-dimensional analytical calculation method, the three-dimensional eddy current paths in the conductor and the conductor back iron are effectively simulated, and the established three-dimensional electromagnetic field calculation model is close to the actual situation, and the electromagnetic torque of permanent magnet eddy current couplers of various topological structures under the working conditions of different slip speeds, air gaps and the like can be accurately and rapidly predicted.

Description

technical field [0001] The invention relates to a three-dimensional analytical calculation method for electromagnetic torque of a permanent magnet eddy current coupling, which belongs to the technical field of eddy current analysis of moving conductors. Background technique [0002] The permanent magnet eddy current coupling has the characteristics of no electromagnetic harmonics, good vibration reduction effect, low total cost, low maintenance cost, long service life, etc., and has broad application prospects in many industrial fields. The permanent magnet eddy current coupling is mainly composed of a permanent magnet rotor and a conductor rotor. The conductor rotor is mainly composed of a copper layer and a back iron layer, and the permanent magnet rotor is mainly composed of a permanent magnet array and its back iron. The permanent magnet eddy current coupling usually connects the permanent magnet rotor with the load shaft, connects the conductor rotor with the motor shaf...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a three-dimensional analytical calculation algorithm for the electromagnetic torque of a permanent magnet eddy current coupling, which solves the complex calculation preparation process, cumbersome steps, and torque calculation results and actual values ​​in the case of high slip speeds in the prior art. The problem of large deviation, so as to realize the accurate prediction of the electromagnetic torque of permanent magnet eddy current couplings with various topological structures under different slip speeds, air gaps and other working conditions

Images