Abstract: The magnetic coupler has many advantages, such as high efficiency and reliable transmission. It is widely used in the field of coal machine equipment transmission. However, the heat resistance of the key components of the coupler is poor, which affects the life of the coupler. It is necessary to study the temperature field of the coupler. Specific to the few study on thermal fact of the mining assisted cooling high-power magnetic couplings, a new method, calculating the heat transfer coefficient based on the fluid-solid coupling velocity field, is proposed, which is different from the traditional method plugging rotating speed into the empirical formula. The numerical simulation of the three-dimensional temperature field is conducted, thus getting the temperature field distribution of the coupling which can be applicable to the heat transfer surface of different couplings. The 160 kW coupling is taken as an example for experimental verification, thus analyzing the temperature change law of the coupling at different positions and with different input torques. As time goes on, the temperature increases first and then stabilizes. When it is stable, it reaches the state of thermal equilibrium. When the input torque increases, the temperature rises and the stable temperature increases correspondingly. The torque increases at 10Nm, and the final stable temperature increases by 15 degrees. Finally, through the comparative analysis of the numerical simulation data and the experimental data, the error is 2%-3%. The correction of the proposed method is verified, which is of great importance for the temperature protection design and cooling structure optimization of the coupling control system.

Key words: cooling fin, fluid-solid coupling, mining magnetic coupling, three-dimensional temperature field