An Electrical Machine Made with Inorganic Rigid Coils: A Breakthrough Toward High Temperature Motors Designed for Aeronautics

The paper proposes a comparative approach of two insulation technologies of compact electric machines widely used in aeronautics. The first one is based on polymers that have limited working temperatures. The second one uses inorganic materials (vitro-ceramic layers and cements) able to withstand much higher temperatures. The comparison is based on a thermal equivalent circuit able to estimate the temperature of the main parts of the machine. The main weaknesses of inorganic coils are analyzed and solutions are proposed for designing coils able to operate in a high temperature compact permanent magnet synchronous motor.