Key Technologies for Driving and Transmission of Full Permanent Magnet Motor System in Coal Mine

The paper introduces the main components and the structure, principle, development status and trends of full permanent magnet motor drive transmission systems; different drive transmission systems are matched for coal mine subdivision scenarios; the magnetic field, temperature field, machinery, control and other multi-physics fields were analyzed using the permanent magnetic coupling as an example. The main conclusions are as follows: when the disc diameter is 500 mm, the torque transmission capacity of the magnetic field is inversely proportional to the air gap, the optimal copper plate thickness is 6 mm, and the maximum transfer torque is achieved when duty cycle is 0.75; the maximum temperature of the heat sink is 58.67 ℃ and the temperature is within the safe range; the strength of the gear and the contact stress of the speed regulation groove meet the requirements of stress and material deformation; the soft start acceleration is less than 0.25 m/s2.