A Modified Thermal Rewind Model of Permanent Magnet Motors Based on Finite Formulation Method
Zhu Gaojia1, Zhu Yinghao1, Zhu Jianguo2, Tong Wenming1, Han Xueyan1
1. National Engineering Research Center for Rare Earth Permanent Magnet Machine Shenyang University of Technology Shenyang 110870 China; 2. University of Technology Sydney Sydney NSW 2007 Australia
Abstract：The amorphous alloy (AA) lamination has attracted extensive research attentions in motor design because of its superior characteristics of high magnetic conductivity and low power loss density. Since the motors utilizing AA cores are mostly operated under the frequency conversion control systems, the heat generated may cause high temperature rises and limit the thrust output. The field analysis of thermal behavior of a 7kW axial flux permanent magnet (AFPM) motor with an AA core is embedded with a double-circulation procedure. The inner loop of the system is used to verify the fluid temperature. The outer loop is used to judge veracity of losses, heat conductivity coefficients, and heat convection coefficients. The temperature field analysis technique based on cell method (CM), also known as finite formulation method (FFM), is modified to simplify the rewind process of heat conductivity coefficients and reduce the computing work introduced by iteration. The calculation system is validated by experiments, and proves to be a valid and simple candidate for temperature distribution analysis of AFPM motors utilizing AA cores.
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2017, Vol. 32 
