Research On Force Distribution Function And Position Sensorless Control Of Long Stroke Low Cost Linear Reluctance Motor

Modular Stator Linear Switched Reluctance Motor is based on the traditional linear switched reluctance motor.The stator side of the motor is modularly transformed,so that the stator side can be produced in large quantities and in a stream In the field of linear motion,compared with the operation mode of the traditional rotary motor plus screw drive,the modular secondary side linear switch reluctance motor can greatly overcome the problems of slow commutation speed,wire rope breakage and pulley aging.Moreover,the advantages of the modular secondary side linear switch reluctance motor are simple and strong,low manufacturing cost,good speed regulation performance,strong overload capacity and high reliability,etc.,which are more and more favored in the field of linear drive.Especially in the fields of rail transit,elevator systems of high-rise buildings in cities,vertical lifting systems at construction sites,and assembly lines of factories,etc.,it has become more and more widely used.Due to the characteristics and frequent commutation of the linear switched reluctance motor,the thrust ripple of the linear switched reluctance motor is large,which affects the use of the motor to a certain extent.Therefore,on the basis of fully analyzing the characteristics of the modular secondary side linear switched reluctance motor,this paper focuses on the method of weakening the reasoning fluctuation of the modular stator linear switched reluctance motor and the control of the modular stator linear switched reluctance motor.The detailed research contents of this article are as follows:The first part mainly introduces and sorts out the domestic and foreign research situation in the field of linear switched reluctance motors,and focuses on the domestic and foreign research status of linear switched reluctance motors in terms of body and control.The second part mainly introduces the structural characteristics of the modular stator linear switched reluctance motor,the composition and basic working principle of the motor control system,comparative analysis of MSLSRM and traditional linear switched reluctance motor CLSRM,and focuses on the analysis of the motor inductance Model,and made a quasi-linear model of the motor inductance.The third part is aimed at the characteristics of large thrust pulsation during the commutation process of the modular secondary side linear switched reluctance motor,and the method of weakening the thrust fluctuation of MSLSRM.By comparing and analyzing a series of force distribution functions,we found out The force distribution function that can weaken the thrust fluctuation to the greatest extent.And introduces the traditional control strategy method of modular secondary side linear switch reluctance motor based on position sensor,and introduces the construction of joint simulation platform and hardware platform in detail.Among them,the procedure of controlling the joint simulation is mainly carried out by MATLAB/simulink,Simplorer and Maxwell software.The hardware platform is mainly composed of the host computer,dSPACE controller,control box and motor.Finally,conduct joint simulation experiments on the software platform and experiments on the hardware platform.The fourth part mainly introduces the MSLSRM based sliding mode control method based on position sensor.First,the basic theory of sliding mode control is introduced.Then,it focuses on the design of MSLSRM speed-loop sliding mode controller and current-loop sliding mode controller.The joint simulation experiment on the software platform and the hardware platform experiment are carried out.The fifth part mainly introduces the position sensorless control of MSLSRM,uses high-frequency pulse injection to estimate the position of the mover,and realizes the position sensorless control strategy of the motor.In the position sensorless control,by building the initial position detection module,the initial position of the motor can be detected to ensure that the motor can obtain an accurate initial position signal at any point when it is started.Without changing the drive circuit of the motor,through high-frequency pulse injection to detect the current signal of the circuit,the position of the motor can be estimated.And conduct joint simulation experiments on the software platform and experiments on the hardware platform.