Research On Temperature Rise Characteristics And Water Cooling Structure Optimization Design Of Coreless Permanent Magnet Synchronous Linear Motor

Linear motors are widely used in precision machine tools,3D printing,laser cutting,CNC systems and other fields,which needs to meet the requirements of stable and safe operation under various working conditions.The output thrust of permanent magnet linear synchronous motor is closely related to the motor winding current.Increasing the electrical load of the motor is a feasible way to increase the thrust density of the motor,so as to greatly increase the output thrust of the motor.However,this will inevitably lead to a a rapid increase in the temperature rise of coils.Compared with the structure of coreless linear motor,the coil of coreless linear motor has not enough heat dissipation space,so its temperature rise characteristics should be considered.Water cooling is one of the common cooling methods of motor.It is of great practical significance to study the temperature rise characteristics and water cooling structure design of coreless linear motor.In order to suppress the primary temperature rise of the linear motor(PMSLM),promote the load ability and continuous output thrust of the linear motor under different working conditions,and ensure the safe operation of the motor under various extreme working conditions,this project is based on the finite element analysis(FEA)and thermal network analysis(thermal network analysis)Resistance network analysis(TRA)is used as the main modeling method to study the temperature rise characteristics of linear motor.Based on this,a water-cooling structure suitable for coreless double-layer permanent magnet synchronous linear motor is designed.A water-cooling plate is arranged between the primary double-layer windings,and its cooling water channel topology is designed to optimize the water-cooling structure and water supply system parameters.This project attempts to innovate from the structural design part,and demonstrates the correctness of the modeling method and the effectiveness of the designed water cooling structure from the electromagnetic field and thermal fluid structure coupling field modeling under different working conditions,simulation calculation comparison and experimental comparison.The main work of this paper is as follows1.Aiming at the main research object of this paper-double layer Coreless Permanent magnet synchronous motor,its overall structure and its internal primary winding structure are described..The basic assumptions and mathematical models of temperature field and thermal fluid structure coupling field are given,which provide a theoretical basis for later modeling and calculation.Finally,in order to obtain the temperature rise characteristics of the linear motor in short-time high overload operation and short-time periodic operation,the thermal conductivity and temperature field boundary conditions of the motor primary are solved respectively,and the primary temperature field model of the linear motor is established,and the temperature rise characteristics of the primary winding are obtained.2.According to the results of the temperature rise of the motor primary without water cooling,the water cooling structure proposed in this paper is introduced,and the water cooling plate is arranged between the double-layer windings,so as to improve the heat dissipation efficiency of the motor primary.The heat dissipation effects of the two topologies are compared and analyzed.The thermal network model and coupled FE model of the water-cooled motor are established respectively,and the temperature rise of the linear motor under water cooling is calculated.The results show that the primary temperature rise decreases greatly and meets the expected heat dissipation effect.In order to improve the overload capacity of the motor at this time,a fast calculation model based on response surface model(RSM)is established,according to which the maximum continuous working current of the motor under water cooling condition is calculated.Finally,the electromagnetic FE model of water-cooled motor is established and its electromagnetic performance is analyzed.The results show that the designed water-cooled structure greatly improves the overload capacity of the motor and the continuous output thrust of the motor.3.According to the designed water-cooling structure,taking reducing the influence on the electromagnetic performance of the motor and reducing the energy consumption of the water-supply system as the basic principle of optimization,the water-cooling structure and water-supply system are analyzed in more detail.The electromagnetic performance of the motor and the energy consumption of the water supply system under different cross-section shape of the cooling channel,different depth of the cooling channel and different inlet water velocity of the water supply system are analyzed.Finally,the temperature rise performance of the optimized water-cooled motor is studied.4.The measurement platform of linear motor thrust and temperature rise is established,and several groups of comparative experiments are designed to verify the accuracy of various modeling methods and the effectiveness of the designed water cooling structure.Therefore,the temperature rise calculation model and the designed water cooling structure can provide a new idea for the research on the temperature rise characteristics of linear motor and the design of water cooling structure.