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Also called magnetic coupling, permanent magnet actuator Permanent magnet Eddy-current drive device is mainly made of copper rotor, and controller of permanent magnet rotor consists of three parts. In General, copper rotor and motor shaft connected permanent magnet rotor and shaft connections, copper rotor air gap between rotor and magnet (known as gap), no mechanical connections transmit torque. In this way, motor and formed soft machine (magnetic), by adjusting the air gap to achieve the work shaft torque, rotational speed changes. Due to different ways of adjusting the air gap, permanent magnet type Eddy current drives are divided into standard, delay, Torque limiter, speed type, such as different types.