| Permanent magnet linear synchronous motor is born with the development of permanent magnet materials and linear motor and widely used,because of its high efficiency,high precision,zero transmission and other outstanding characteristics,so that it in CNC machine tools,aviation electromagnetic transmitters,optical equipment,transportation and other fields show irreplaceable advantages.Since the thrust of most cylindrical linear motors is small and there are large thrust fluctuations,which cannot meet the actual requirements,it is necessary to optimize the electromagnetic thrust and thrust fluctuations through algorithm and structure improvement in motor design.The research content of this paper is mainly divided into the following aspects:1.According to the technical requirements of the actual application,the electromagnetic design of the linear motor is completed,including the selection of slotpole combination,the calculation of permanent magnet size,the selection of air gap height,the calculation of the width and height of the primary groove,the determination of winding size and arrangement order,the calculation of magnetic circuit and synchronous reactance,etc.,and the preliminary design scheme of cylindrical linear motor is given.2.Establish the two-dimensional magnetic field analysis model of linear motor,analyze and calculate the magnetic field of linear motor by equivalent magnetization strength method,establish the partial differential equation of vector magnetic potential,and solve the equation by boundary conditions to obtain the mathematical expression of magnetic induction intensity in each area of the motor,which provides a theoretical basis for the subsequent magnetic field calculation.Maxwell’s tensor method is used to solve the electromagnetic thrust of linear motor,and it is verified by comparison with the finite element results.3.Taking electromagnetic thrust and thrust fluctuation as the optimization goal,the key parameters of the motor are analyzed and screened out through Taguchi orthogonal experiments,the response surface is constructed by Box-Behnken Design(BBD)method,and the target parameters are optimized by combining the secondgeneration Genetic Algorithm(NSGA-II.),and then the motor is optimized twice to meet the requirements.The electromagnetic field analysis of the optimized motor model is carried out to view the dynamic and static characteristics of the motor,and then the temperature field of the motor is simulated to check the temperature rise of the motor and give the insulation level of the motor.4.Build a test platform for cylindrical linear motors,conduct no-load tests on the motors,and check the controlled performance of the motors.Carry out the motor thrust fluctuation test,check the rationality of the test results,and compare the test results with the simulation results to verify;The static force test of the motor is carried out,the electromagnetic thrust of the motor under different currents is measured,and the thrust constant is compared with the simulation calculation results,and the rationality of the motor design is verified by the above tests. |
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