Design And Optimization Analysis Of Ironless Permanent Magnet Synchronous Linear Motor

Due to the influence of the core breaking,the traditional iron core linear motor has the end-effect of lateral and vertical side,which makes the output of the thrust fluctuate greatly.The ironless permanent magnet synchronous linear motor has the advantages of zero slot effect,simple structure and flexible control,which is widely used in the fields like precision machine tool.The ironless permanent magnet synchronous linear motor(ILPMSLM)is studied as the research object in the thesis,and research the structure and the working principle of the motor,and gives the electromagnetic and dynamic models,and the structure parameters of the motor are optimized.These main contents of this paper mainly contain follows:1)Firstly,the basic structure and working principle of linear motor are introduced,and then the development of ironless permanent magnet synchronous linear motor is briefly analyzed.2)The structure of the ironless permanent magnet synchronous linear motor is introduced.The analytical and the finite element methods are used for the motors’ electromagnetic modeling to analyze the air gap flux density.Based on the analysis of air gap magnetic field ironless permanent magnet synchronous linear motor problems by using two kinds of analytical method,namely equivalent magnetic potential method and the equivalent magnetizing current method.By the way of comparing the analytical solutions with the finite element analysis results,the analytical method for magnetic field analysis is verified to be accurate.The analytic equation of magnetic flux density is deduced,and the influences of the motor key dimensions on the magnetic flux density is analyzed.3)Winding construction and characteristic of the motor are introduced.The thrust is deduced according to the magnetic flux density and winding construction.According to the analytical expression of the motor thrust,the influence of the main dimensions of the motor on the thrust is analyzed.4)This paper uses response surface methodology as the optimization method of the thrust of ironless permanent magnet synchronous linear motor.The Taguchi algorithm is applied to select the structural parameters that affect the motor’s thrust greatly.Then,based on the central composite design(CCD),the sample point group is constructed.The response surface model of the thrust is presented through the small-scale tests.5)The variance of the response surface model is analyzed to verify the linear relationship between the response values and variables.Based on the pre-optimized design,the permanent magnet rotor deflection type of ironless permanent magnet synchronous linear motor prototype is designed and manufactured,and the prototype experiment verifies the reliability of the response surface model.By changing the motor parameters,the optimization design is achieved,which provides the reference for the design and analysis of same kind of motors.