Research On Control System Of Primary Staggered Double-sided Linear Flux-switching Permanent Magnet Motor

In recent years,with the rapid development of the national economy and the continuous advancement of urbanization,high-rise and super high-rise buildings have become an effective means to ease the tension of urban land and highlight the appearance of urban areas.With the continuous improvement of building height,the inherent defects of traditional traction elevators become more and more prominent,and the direct drive elevator system based on linear motor is gradually attracting the attention of scholars because it is not limited by steel ropes and does not require mechanical conversion devices.As a new type of linear permanent magnet synchronous motor,in which the permanent magnet and the armature winding are both located on the primary,and the secondary is only laminated by silicon steel sheets,linear flux-switched permanent magnet(LFSPM)motor has the advantages of of high efficiency,large thrust and simple secondary structure.When a short primary and long secondary structure is used,and the secondary is used as the stator,this type of motor is very suitable for long stroke applications,which can effectively reduce system costs and improve system reliability.In this paper,a new primary staggered double-sided linear flux-switching permanent magnet(PSDS-LFSPM)motor is taken as the research object.The operation principle and electromagnetic characteristics are analyzed,based on which the relevant mathematical model is deduced.According to the characteristics of the unbalanced three-phase inductance of the motor,an improved phase-locked loop with a notch filter is proposed.By combining active disturbance rejection control(ADRC)technology and sliding mode observer(SMO),the senorless control system of the PSDS-LFSPM motor is constructed,which effectively improves the estimation accuracy of position and velocity.The main contents of this thesis include:1.The topological structure and operation principle of the PSDS-LFSPM motor are analyzed,and the permanent magnet flux linkage,no-load EMF,armature winding self-inductance and mutual inductance,and detent force are simulated.Mathematical models in abc coordinate system and dq coordinate system are established,and a simulation model of PSDS-LFSPM motor based on Matlab/Simulink is built,which lays the foundation for subsequent research.2.The development and core ideas of ADRC technology briefly are overviewed and summarized.On this basis,combined with the mathematical model and characteristics of the PSDS-LFSPM motor,an ADRC speed controller is constructed to suppress external dynamic disturbances effectively.Based on the Matlab/Simulink environment,a simulation model of the motor system is established to verify the effectiveness of the scheme.3.The unique mutual inductance unbalance characteristic of PSDS-LFSPM motor is analyzed and discussed,and the influence of the unbalance characteristic on SMO-based sensorless control is further discussed.To suppress the influence,an improved phase-locked loop based on a notch filter is proposed,so that the estimation accuracy of position and velocity,as well the control performances are improved.4.Finally,the no-load characteristic experiment and static thrust experiment of the PSDS-LFSPM motor are carried out to verify the basic electromagnetic performance of the prototype.The PSDS-LFSPM motor experiment platform with RTU-BOX204 as a core is built,and the reliability and rationality of the ADRC controller are verified by comparing the experimental waveforms of the PI controller and the ADRC controller.The experimental waveforms of the sensorless control method with NF-PLL and the traditional sensorless control method are compared to verify the feasibility.