Analysis of 3D Transient Temperature Field for Permanent Magnet Linear Synchronous Motor with High Thrust Density

Double-side tabular permanent magnet linear synchronous motor (PMLSM) with high thrust density, which is with high current density, produces large loss and quick temperature rise. In this paper the mathematic model of three- dimensional (3D) transient temperature Held for a permanent magnet linear motor with high thrust density is established, and the basic hypothetical conditions and relative boundary conditions of the solved region are presented. The temperature fields of motor in different working systems are calculated. Also the laws of motor transient temperature rise and distribution are analyzed. Calculation and practical measurement results are in satisfactory agreement, both of them provide guidance for the security application of these motors with high current density, and provide the basis for the reasonable design of the cooling system.