Thrust optimization design method for tubular permanent magnet synchronous linear motor

Abstract

The invention discloses a thrust optimization design method for a tubular permanent magnet synchronous linear motor, which comprises: firstly, building a solid model of the motor and setting run option parameters including the length of the primary iron core of the primary iron core stator of the motor; secondly, resolving the run option parameters by using a finite element method and building a finite element geometrical model; thirdly, calculating the optimization phase difference between the end forces at the two ends of the primary iron core stator according to a formula, and regulating the length of the primary iron core to obtain the optimal length of the primary iron core, which corresponds to the optimization phase difference; and finally, obtaining the tubular permanent magnet synchronous linear motor with the smallest thrust fluctuation through magnetization by the optimal length of the primary iron core, the half-open, half-closed, round-bottom grooved tooth-groove structure and a Halbach structure. In the invention, the thrust fluctuation is minimized by relieving the influences of magnetic drag produced by an end effect and a tooth-groove effect on the thrust fluctuation; the method is simple and effective; and the calculation accuracy is high, and the motor can serve as both an electrical motor and a generator.

Description

technical field [0001] The invention belongs to the technical field of motor design, and relates to a thrust optimization design method of a cylindrical permanent magnet synchronous linear motor, which solves the problem that thrust fluctuations deteriorate the servo operation characteristics of the cylindrical permanent magnet synchronous linear motor. Background technique [0002] When the cylindrical permanent magnet synchronous linear motor is running, the thrust fluctuation phenomenon is caused by the primary core structure of the motor, the inherent edge effect, and the cogging effect. The thrust fluctuation is the main cause of motor vibration and noise, which deteriorates its servo operation characteristics. Especially at low speeds, vibrations even occur, so measures must be taken to reduce the impact of thrust fluctuations on motor performance. [0003] When the cylindrical permanent magnet synchronous linear motor is running, there is an electromagnetic field in i...

AI Technical Summary

Problems solved by technology

At present, the calculation and analysis methods of motors mainly include the magnetic circuit analysis method of concentrated parameters and the electromagnetic theory method of distributed parameters. The magnetic circuit model with concentrated parameters is simple and easy to calculate theoretically. However, due to the non-uniform distribution of the motor magnetic field and the existence of magnetic flux leakage, the calculation error of this method is relatively large. In order to make up for the error, there are a lot of errors in the motor design. To correct parameters, it needs to be obtained through a large amount of engineering experience, which is time-consuming and labor-intensive, and wastes resources at the same time.

The method of distributed parameter electromagnetic field theory mainly uses the Maxwell equation to solve the field distribution function of the entire region, which can handle complex magnetic field distribution well, but this method is complex in theoretical calculation and cannot solve complex boundary conditions and nonlinear factors of materials, etc.

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