Research On Ironless Linear Permanent Magnet Synchronous Loading Motor And Cooling System

With the development of linear motor theory and application, the performance of linear motors need a higher standard, the need of accurate test for linear motor has become more and more urgent, thus the linear motor platform is produced. The loading test is an important part in test platform, the testing accuracy is influenced majorly by the performance of the loading motor in the linear motor test platform. A ironless linear permanent magnet synchronous motor(ILPMLSM) has been proposed in this thesis to be used for loading in the linear motor test platform. A new structure water cooling system is adopted for the proposed motor. The water cooling system made from the material, which is designed on the primary mover of the linear motor. Furthermore, the cooling effect has been explored for two different structures: middle cooling structure and side cooling structure.In the loading experiment, the loading force has two different sources, electromagnetic braking force produced by the current in the coil winding and vortex braking force produced in the cooling jacket, whose direction is the opposite of the moving direction. The research has been done in this thesis from the following perspectives:First, the analytical expression of the vortex density and braking force in the cooling jacket has been gotten by analytical method and been validated by the finite element simulation method. The influence of the cooling jacket parameters on the vortex braking force has been analyzed, which can provide theoretical basis for the following analysis.Second, the finite element models for the both cooling structures have been established, with the braking force fluctuation ratio and density as the optimization goal. The major structure parameters have been optimized from the magnetic field to the braking force. A prototype motor has been manufactured based on the finite element resultsand the relevant experiments have been made on the prototype motor, which validates the rationality of the finite element simulation.Thrid, the design method has been summarized for ironless linear permanent magnet motor with the middle cooling structure, which focuses on the the relations between major motor parameters, the thickness of the water cooling jacket, the strength assessment method and other motor parts.Last, the 3D temperature field finite element model of the motor has been built, based on which, the effect of the cooling system has been analyzed compared with the structure without water cooling system. The short-term working condition has been studied specially for the temperature rise characteristic. Temperature characteristics test has verified the feasibility of this cooling system.