Research Of Double-sided Linear Primary Permanent Magnet Vernier Motor System Control Strategy For Direct-drive Elevator

The manufacturing power strategy-"Made in China 2025",which defines the basic guidelines for the development of equipment manufacturing industry of our country,has been implemented in recent years.This year marks the 40 th anniversary of the reform and opening up.The development of market economy and the process of urbanization have become more in-depth.With the rapid development of modern office buildings and commercial property industry,the demand of elevators has increased rapidly.With the continuous development of modern buildings,the drawbacks of traction elevators with ropes have become increasingly prominent.Direct-drive elevators based on linear motors have become a hot topic for scholars in various countries.The double-sided linear primary permanent magnet vernier(DSLPPMV)motor has advantages such as high efficiency,low speed,and large thrust,so it is suitable for the elevator drive system.From the viewpoint of improving the performance of elevator operation,such as comfort,safety,and rapidity,a direct-drive elevator based on linear motors control system is studied in this thesis.The research content of this thesis is as follows:Firstly,the research status of the elevator drive system and the research status of the low speed control system of the direct drive elevator system are introduced.The structure and working principle of the DSLPPMV motor are described.The mathematical models of the DSLPPMV motor in the three-phase stationary coordinate system and in the d-q rotating coordinate system have been established,and the direct drive elevator motion equations based on linear motor has been analyzed.Secondly,the linear motor control type and the space vector PWM are introduced.The performance requirements of elevators and the common elevator speed curves are introduced,and the mathematical formulas for the trapezoidal speed curve,S-speed curve,and sine-velocity curve of the elevator are deduced.And the elevator startup process with backwards phenomenon is analyzed.For direct-drive elevators,the unsteady load causes the sliding distance and speed of elevator vehicle.Therefore,this paper studies a more effective anti-disturbance controller(ADRC).Once again,by establishing a Matlab simulation model based on traditional PI control or ADRC control DSLPPMV motor system,the control performances have been investigated.It is concluded that the ADRC control strategy effectively reduces the sliding speed and distance of elevator vehicle,improves the response speed of the electromagnetic thrust of the DSLPPMV motor and satisfies the passengers' requirements for the comfort of the direct-drive elevator.Finally,the drive control system of DSLPPMV motor is introduced,and the DSLPPMV motor drive control platform is established.The framework and design module of the software programming of the control system are constructed.Based on the established plat,the experimental results of the direct drive elevator are presented and discussed to verify the theoretical analysis.