Research On The Drive Control Strategy Of The Magnetic Flux Switching Permanent Magnet Linear Motor For Elevators

Since the beginning of the 21 st century,Chinese urbanization process has been accelerating.More and more high-rise buildings have sprung up in the city because of saving construction land.Elevators have become an indispensable and necessary equipment for these high-rise buildings.With the continuous refreshment of floors,the disadvantages of traditional traction elevators have become increasingly prominent,while direct-drive elevators are driven directly by linear motors,which are not limited by the height of the floor and are showing their vitality.The permanent magnets and armature windings of the linear flux-switching permanent magnet motor are set at the primary short mover,and the secondary long stator is only composed of the magnet core,which has obvious advantages in direct drive elevators.This paper takes the LFSPM motor as the research object and studies the control strategy of the direct-drive elevator.The research content of this thesis is as follows:1?The mathematical model of LFSPM is introduced,and its dynamics model is mainly analyzed.The three-loop vector control system of the motor is constructed.The dead-band effect in the PWM modulation process is mainly explained and the nonlinearity of the inverter is modeled and compensated.2?Based on the PI control,the LFSPM direct-drive elevator system controller is designed.The displacement cloesdloop increases the speed feedforward compensation channel,which reduces dynamic and static tracking error of elevator position.The interference observation compensator based on DOB and Kalman filter is designed to suppress the interference,and the experiment is completed to compare the suppression effect.3?S-shaped speed curve of the elevator is designed and experimentally verified,which proves that the dynamic and static characteristics of the designed S-shaped speed curve of the elevator meet the requirements.4?The position sensorless control system of LFSPM motor based on model reference adaptive system is constructed.The ratio of the fundamental wave in the voltage and current signals is increased through flux-strengthening control.For the first time,the sensorless control of LFSPM motors in four quadrants was realized,and the current compensation method was used to reduce Position estimation errors.An open loop detection method based on pulsed high frequency voltage signal injection method is introduced.