低温环境下的低速大转矩永磁电机设计及检验OA

In response to the stringent requirements of large torque,low speed,high operational stability,and high energy efficiency imposed on the drive system by gold flotation machines during mineral separation,a direct drive solution is proposed utilizing a low-speed high-torque permanent magnet synchronous motor(PMSM)to replace the traditional asynchronous motor coupled with a gear reducer.To validate the feasibility of the design scheme,finite element analysis technology is employed to conduct multi-physics coupling simulations of the motor performance,with a focus on the torque output characteristics,cogging torque variation patterns,and mechanical stress distribution of key components under working temperature(75℃)and low-temperature(-35℃)conditions.Specifically,under low-temperature conditions,the motor's rated output torque is found to be greater than that under normal temperature conditions.The cogging torque at low temperature increases from 2.54%of the rated torque under normal temperature to 3%of the rated torque,which remains within a reasonable range.The simulation results demonstrate that sufficient rated torque output can be maintained even in low-temperature environments,and the maximum equivalent stress on the rotor structure is 37.1 MPa,far below the material's yield limit.Compared with the traditional asynchronous motor drive system,the new solution eliminates downtime losses associated with gearbox maintenance.This study not only provides a more efficient drive solution for gold flotation machines,but also offers valuable references for the design of direct-drive high-torque motors in other industrial applications.