Electromechanical Evaluation of a Double-Core Motor With Ceramic Elements

This study investigated the prospect of embedding ceramic elements in the body of a double-core transverse-flux machine to mitigate heat in the machine's coil. In addition, the ceramic elements were used to hold the coil above the permanent magnets in order to reduce the negative flux leakage of the magnets into the coil. Three types of ceramics were investigated for this purpose: glass ceramic, aluminum oxide, and silicon nitride. Steady-state thermal analysis demonstrated a significant temperature drop in the motor coil when the ceramic element was embedded in the design. The back electromotive force of the winding improved by 30% as a result of reduced leakage flux. Structural analysis of the motor demonstrated high endurance of the ceramic elements to thermal stress and motor vibration. The results of computer thermal analysis were verified in the laboratory by performing a test on a section of a motor.