Research On Double Sided Moving Magnet Ironless Permanent Magnet Linear Synchronous Motor For Intelligent Transmission

Made in China 2025 puts forward the overall strategy of "a big country made in China",With the improvement of enterprise equipment automation and the needs of logistics and warehousing industries,intelligent transmission has ushered in rapid development,and its market demand has gradually increased.The core of intelligent transmission lies in linear motor transmission.With the continuous improvement of production automation and intelligence,it has been widely used in agricultural machinery,home appliances,light industry,chemicals,tobacco and other manufacturing fields.However,during the transmission process of the linear motor,the temperature of the motor will also change due to long-term operation,which will change the coil resistance performance of the stator part of the motor.In order to facilitate the maintenance of local faults and avoid affecting the overall system,this paper considers the characteristics of its own work,and takes into account the simplicity of its installation and replacement,and modularizes the stator to reduce the difficulty of motor manufacturing and assembly.Firstly,this paper uses analytical calculation and finite element simulation to study the air-gap flux density and electromagnetic thrust characteristics of the motor,and determines the winding form and motor structure of the permanent magnet linear synchronous motor.Concentrated winding fractional slots and integer slots are compared and analyzed,and the scheme of concentrated winding integer slots is selected.By in-depth comparison of the effects of magnetization methods of iron core and ironless permanent magnet synchronous linear motors,single-sided and double-sided permanent magnet linear synchronous motors,NS pole opposite and NN pole opposite on motor performance,due to the iron core structure without teeth Due to the slot effect,the double side is twice the electromagnetic thrust of the single side permanent magnet synchronous linear motor,and the NS pole pair electromagnetic thrust is larger,so the double side moving magnet type ironless permanent magnet linear synchronous motor structure is chosen.Secondly,this paper optimizes the parameters of the bilateral moving magnet ironless permanent magnet synchronous linear motor.According to the basic electromagnetic law,the mathematical relationship between the main structural parameters and the thrust density is deduced,and the influence of the main structural parameters on the thrust density is analyzed.Then,on the basis of establishing a finite element simulation model,the influence of different motor parameters on the electromagnetic thrust and thrust fluctuation of the motor,including the influence of the motor permanent magnet width,permanent magnet height,air gap length,slot width,and slot height on the motor performance.It can be seen from the simulation that the height and width of the permanent magnet increase,the thrust of the motor increases,and the thrust fluctuation increases.As the air gap increases,the thrust decreases and the thrust fluctuation decreases gradually.The increase of groove width and groove depth will reduce the electromagnetic thrust,resulting in the increase of electromagnetic thrust fluctuations.Furthermore,a dual-side moving magnet ironless permanent magnet synchronous linear motor system controlled by single-chip microcomputer is developed in this paper.Permanent magnet linear synchronous motor system mainly includes sensor module,control module,power amplifier module,upper computer operation interface,motor motion control system and serial communication.The upper computer operation interface communicates with the controller through the serial port.After the motor system is powered on,it sends a start signal to the controller through the upper computer control button.After the controller receives the signal,it sends out a pulse signal,which is amplified by the power amplifier module to drive the motor to move.After analysis and research,the mechanical structure size of the permanent magnet linear synchronous motor was determined,and an experimental prototype was developed.At the same time,the test measurement was carried out for the prototype.The test results show that the dualside moving magnet ironless permanent magnet synchronous linear motor system has good control performance,and the application in the intelligent transmission system has been preliminarily realized.