Abstract
Abstract Heat transfer is as important as electromagnetic and mechanical design. The analysis of heat transfer and fluid flow in motors is actually more complex, more nonlinear, and more difficult than the electromagnetic behaviour. It is often dealt with by means of simplified equivalent circuits, and rarely receives the detailed analysis lavished on electromagnetic aspects. Perhaps there is some justification for using approximate methods for heat transfer, when exact methods are pursued for electromagnetic design. The electromagnetic design determines the geometry of laminations which are cut to fine tolerances. Their geometry and thickness, together with their material properties and the design of the windings, determine whether or not the motor will deliver the required torque. They also determine the precise voltages and currents that will be experienced by the power semiconductors in the controller.
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