Generally copper rotor (Steel rotor with copper ring) connect with motor shaft, permanent magnet rotor (aluminum rotor with permanent magnets) connect with load shaft. There is only a air-gap between copper rotor and permanent magnet rotor without mechanical connection for transmition the torque. When the motor rotates, the copper ring of copper rotor cut the magnetic field lines of permanent magnet, generate inductive eddy current and creates a magnetic field in copper rotor, thereby transmitting torque across the air-gap. Smaller air-gap, stronger the force of transmitted torque. Otherwise, weaker the force of transmitted torque. Vary the air-gap spacing by actuator component which is operated by hand or automatic control system.
Adjust air-gap for getting required torque and speed with significant energy-saving effect.
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