Materials characterization and geometry of a high temperature induction machine

The goal of this paper is to describe the materials and building technique to design a high-temperature induction machine which temperature winding is about 500°C. First, the candidate materials are identified and because of the constraints imposed by these materials, a special geometry is proposed. The authors show that inorganic insulation has to be preferred for the conductors and the slot insulation. Tests are done to select the materials by measuring the turn to turn voltage, insulation resistances or the parallel capacities. It is shown that Grain Oriented (GO) Fe-Si magnetic steel sheets can be used for high temperature because of their insulation and their magnetic properties. The authors describe a technique using shifted GO steel sheets and they characterize up to 500°C. A particular geometry of the machine is described as well as the method to assemble the different parts of the machine.