| Permanent magnet linear synchronous motor(PMLSM)drives the load to make linear motion directly.It removes the ball screw,belt and other driving equipment which is essential to transform the rotating motion into linear motion,and simplifies the structure of the servo system.It has the advantages of high efficiency,high speed and high acceleration.Equipped with the driver and position detection device,the high precision linear servo system has become the key component of CNC machine tools,high-speed logistics lines,cordless lifting systems and other applications requiring linear motion.High thrust density is a major developing direction of PMLSM research,which is characterized by high electrical load.Thus,it is necessary to improve the heat dissipation capacity of the motor,and water cooling is a more effective way.This paper focuses on the research of moving-magnet water-cooled PMLSM.Firstly,the working principle,mathematical model and thermodynamic characteristics of PMLSM are introduced.Secondly,the topologies of four different pole/slot structures were optimized based on the finite element model.The single-parameter scanning method and the global optimization method are used to optimize the structures in order to reduce the thrust fluctuation while ensuring the thrust requirement.Thirdly,two different water-cooled structures are designed,called inside the iron core cooling and on the back of the iron core cooling respectively.The thermal characteristic is calculated under different cooling water flow rate based on the temperature field finite element model.In comparison with natural air-cooled,the water-cooled scheme is proved to be effective.Finally,the PMLSM installation platform is designed and the prototype machine is manufactured.The electromagnetic and thermal properties are tested,which proves the validation of theoretical analysis.The analysis results in this paper can provide an effective reference for the design of high thrust density PMLSM. |
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