Temperature Field Calculation Of Permanent Magnet Reciprocating Linear Generator

In this paper,the heat generating principle and steady temperature field are researched taking the temperature field of a 1.1kW permanent magnetic reciprocating generator as researched object. The generator configuration and principle of work are very complex. To figure out the exotherm distribution exactly, it is necessary to calculate the value of the thermal parameter of the generator first.In this paper the differences between the permanent magnetic reciprocating linear generator and the common rotating generator in configuration and working principle aspects are firstly introduced,then the fundamental principle of heat transfer theory is introduced.The origin of heat in the generator and thermal parameter of every component are figured out,and the finite element method is adopted to analyze the electromagnetic loss under steady state working.The left side and right side of the mover are windward and leeward alternately while the generator working because the mover reciprocate periodically.After doing some proper simplified treatments and hypothesis, the three-dimensional finite element model of the permanent magnetic reciprocating generator is created,and the average wind speed in every side vicinity of every component during a period is figured out,then the heat transfer coefficient of every side of the component is figured out according to empirical formula.This paper treats with the insulation by using equivalent method can improve the result precision.The temperature field of the permanent magnetic reciprocating generator has been calculated on 2D and 3D plane by using finite element method, and a contrast between the calculation result and the test result proved the accuracy of the calculation.The 2D plane result has a larger error than the 3D plane,but the 2D plane is available when the result accuracy is not strictly demand.The temperature field of the upper and the under stator is symmetrical because the generator has a symmetrical structure.The hottest point of the generator is in the middle of the winding,and the exotherm of the permanent magnet is in allowed band meeting the work requirement.