Abstract: The potential ignition source of magnetic couplings was analyzed in coal mine explosive environment. The effect of eddy current, magnetic flux and surface temperature in explosive environment were investigated by theoretical calculation, simulation and tests. The results show that the induced electromotive force in coppers is less than 30 mV with normal condition and less than 1.2 V with fault condition. Eddy current constitutes a closed loop so that there is no voltage between inner and outer circumference. There is no magnetic flux outside the shell of magnetic couplings and the maximum magnetic flux is 500 mT at the air gaps. The surface temperature is less than 150 °C both in normal and fault conditions, and it can be automatically disengaged under the axial force. Eddy current and magnetic flux are not the potential ignition sources in coal mine explosive environment. Surface temperature is within the allowed range of the environment and can be monitored and controlled by temperature and speed sensors.