Thermal analysis of direct drive transverse flux rotary machine with two types of stators

This paper presents the thermal analysis of a transverse flux rotary machine (TFRM) with two types of stator, which is studied for high torque direct drive motor applications. Due to the high pole number and highly saturated cores, the core losses are one of the major heat sources with an armature copper loss. Therefore, it is important to be able to calculate the core losses accurately, and reduce it. In this paper, 3-dimensional finite element analysis method is employed to accurately calculate the temperature distribution. Core losses are directly coupled into the thermal calculation by keeping the same tetrahedral meshing for magnetic-field analysis and thermal analysis. To find the solution for reduction of core losses, the TFRM with two types of stator is investigated. A testing bench for the TFRM prototypes has been set up to measure a rise in temperature. The calculation and measurement results are compared and discussed.