Research On Temperature Field Of Controllable Excitation Linear Maglev Synchronous Motor

The controllable excitation linear maglev synchronous motor has been used in the feed platform because of the advantages of large driving force,low loss,high response speed and high positioning accuracy,and it can realize direct driving and direct suspension and eliminate the friction between the platform and the guide rail.However,excess temperature in the operation of the motor will accelerate the aging of insulating material between the coil and the silicon steel sheet,which will affect the normal operation of the motor and thus affect the accuracy of the running platform.In this paper,the finite element model of linear maglev synchronous motor was established.The temperature field of the motor was analyzed and the cooling device was designed.The main research contents are as follows:1.The mathematical model and parameter calculation of temperature field of controllable excitation linear maglev synchronous motor were established.The structure and operation mechanism of linear maglev synchronous motor was analyzed,and the heat transfer principle of the motor was analyzed to determine the thermal conductivity coefficient,specific heat capacity and density of each material of the motor.The equivalent analysis of the winding and insulating material of the motor was carried out to determine the equivalent thermal conductivity coefficient.The principle of convection heated dissipation was analyzed and the convection heated dissipation coefficient at different armature current was calculated by the formula.2.The loss distribution of controllable excitation linear maglev synchronous motor at different armature currents was studied.The motor winding resistance value was calculated according to the formula,and then calculating the copper consumption of stator and actuator according to the current effective value.The ANSYS Maxwell software was used to carry out the fitting calculation of the core loss coefficient of the silicon steel sheet,and the finite element simulation data of the motor’s stator and mover iron loss was obtained.The calculation data of the formula and the loss results of finite element calculation were analyzed and compared.3.The finite element software ANSYS Workbench was used to calculate the temperature field of the motor.The influence of different armature current on the temperature distribution of motor was analyzed by two-dimensional temperature field simulation.In order to set the boundary conditions more accurately,the temperature variation of each interface was analyzed.Considering the temperature field variation of the end effect of the motor,a three-dimensional finite element model of the motor was established to simulate the transient temperature field.4.The water-cooling system for controllable excitation maglev linear synchronous motor was designed.The temperature field of the motor running in a vacuum environment was simulated.Aiming at the problem that the temperature is too high,the water-cooling device is adopted to calculate the relevant thermal parameters of the water-cooling device,and to determine the required indexes such as power,flow rate,tank size and inlet and outlet temperature.After adding the water-cooling system,the finite element software is used to simulate the motor again to verify the effectiveness of the water-cooling device.