Performance prediction and test of adjustable, permanent-magnet, load transmission systems

The use of permanent magnets to transmit mechanical power by the induction of eddy currents is explored for two devices, an eddy current brake for use in dynamometers and an adjustable coupling system to produce a variable-speed drive without the use of power electronics. These systems have been examined in detail both theoretically, with a layer theory model solving for Maxwell´s stress tensor, and in the laboratory with devices capable of transmitting up to 200 hp with controlled airgaps and stabilized temperatures. The work exhibits good correlation between the mathematical model and the test data which indicates that the former is a useful design tool for these and derivative devices.