Evaluation and experiment of impact resistance and continuous load capacity of canned motor for vacuum dry pump

Aiming at the problem that the continuous load carrying capacity of the motor under impact load cannot be reasonably utilized in the actual working process of the vacuum pump, the continuous load capacity of canned motor for vacuum pump is calculated quantitatively and analyzed experimentally. Taking a 5 kW canned motor as an example, according to the cooling conditions of the vacuum pump in operation, the finite element analysis method was used to calculate the steady state temperature field of the motor in rated operation under 25 ℃ and 33 ℃ cooling water, so as to determine the hot spot position and the safety margin of the hot spot temperature. By setting the overload torque to simulate the impact load, and without considering the dynamic characteristics of the motor confirming that the motor has no risk of stalling, the transient temperature field under the motor overload state was calculated to obtain the temperature rise curve of the hottest point of the motor under different load multiples, and the insulation limit was used to quantitatively calculate the motor continuous load capacity after sudden load. By carrying out load capacity test experiments on the prototype, a comparative analysis of the obtained test results and simulation calculation results shows that the motor's rated operating load capacity needs to be further explored, and the motor can still operate safely and continuously within the allowable time under the impact load with reasonable load rate. This research has a certain reference basis for the full application of overload capacity and the determination of the operating time of motor protection device when the impact load is too large. © 2021, Harbin University of Science and Technology Publication. All right reserved.