Magnetic coupling uses permanent magnets to transmit torque. The magnetic coupling fails when the permanent magnets are demagnetized or lose their magnetism. The main causes of magnetic failure are high temperatures, vibration, reverse magnetization, etc, so, as one of the professional magnetic coupling manufacturers, our magnetic coupling must run in a synchronous state. If the load is too heavy, the inner rotor stops or runs in asynchronous state. If the reverse magnetic field comes from the outer rotor, it will reduce torque or completely damage the coupling.