Magnetic couplings generate heat when working. There're several reasons: metal which adhesives with magnet affected by alternate magnetic field generates induced current, it will lead to eddy current which will produce heat. Or unreasonable installation, rub the rotor against stator. We all know that temperature is a big enemy of magnets. Then how to minimize this effect. * Choose right magnet to improve working efficiency of magnetic couplings. * Reduce running speed to minimize heat from eddy current * Efficient heat dissipation measures are adopted to take away the heart generated by coupling.