Double V-type Ironless Permanent Magnet Synchronous Linear Motor Cooling System Design

In this paper,the double V coreless permanent magnet synchronous linear motor（PMSLM）is taken as the research object.On the basis of changing the shape of coil and permanent magnet,the thrust fluctuation of the motor is further reduced and the repeated positioning accuracy is improved.Therefore,it can be better applied in super precision positioning system.However,due to the lack of heat dissipation of iron core,the primary heat dissipation of double-V-type ironcoreless PMSLM is relatively difficult.As a result,the primary temperature rise of the motor is too high,which affects the detection accuracy of laser interferometer and causes positioning system error.Therefore,it is particularly important to design efficient double V-shaped core-free PMSLM cooling system.The research contents of this paper are as follows:First,based on the analysis of different flow channels,combined with 3D printing technology and the specific structure and size parameters of double V-shaped coreless PMSLM.An integrated double V-shaped coreless PMSLM primary cooling structure is proposed.The fluidity of the cooling structure is verified by fluid field analysis.Secondly,based on the design of the primary cooling structure of the double V-type coreless PMSLM,a three-dimensional simplified analysis model of the primary temperature field of the motor is established.The winding loss density is obtained by calculation method,which is used as the heat source for temperature field simulation.Based on the equivalence theory,the equivalence processing is carried out on the primary internal complex structure,and various material physical property parameters after equivalence are obtained,which are assigned to the analysis model.Based on the temperature field simulation results,the primary temperature distribution of double V-shaped coreless PMSLM under different inlet flow rates was obtained.Then the influence of different inlet flow rate on the cooling structure performance of the motor is analyzed.The optimal flow rate was obtained by drawing the primary maximum temperature curve at different flow rates.Thirdly,the motion scheme of double V-shaped PMSLM without iron core is designed.Air float guide rail is used as the motor movement guide rail.The integrated structure design of motor and air float guide rail was carried out,and the processing of primary cooling parts,winding and sealing of coils and installation and fixation of secondary permanent magnets were completed.Finally,the overall experimental scheme is designed,and the temperature rise experiment and cooling experiment platform of double V-type coreless PMSLM are built.And debugged it,and completed related experiments.By comparing the cooling experiment results with the simulation results,it is found that they are consistent,which verifies the accuracy and reliability of the simulation results.The effectiveness of the cooling structure is verified by comparing the cooling experimental results with the temperature rise experimental results.To sum up,In this paper,the cooling system is designed for the double-V type iron-coreless PMSLM.analyzes the circulation and cooling performance of the cooling structure,and obtains the optimal inlet flow rate of the cooling liquid.The rationality of the cooling structure is verified through the experimental study of the prototype.It can greatly reduce the primary temperature rise of double V-type coreless PMSLM,meet the application requirements of the ultra-precision positioning system,and has practical guiding significance for the design of the subsequent motor cooling system.