Research On Closed Loop Control System Of Voice Coil Motor Based On L1 Adaptive Control

With the rapid development of science and technology,precision engineering technology involves more and more fields,including microelectronics technology,nanotechnology,precision processing technology,aerospace technology and other fields.Therefore,the precision positioning and control methods of the system at home and abroad And system stability and other aspects also put forward relatively high requirements.This article is mainly based on the automatic positioning of the voice coil motor to realize the automatic focus of the lens for research and analysis.First,a high-precision micropositioning platform for voice coil motors is designed.The platform design can achieve manual and automatic focusing methods,with strong scalability.The servo control method is used to design the voice coil motor drive,which can effectively avoid the interference caused by the static friction torque of the voice coil motor and improve the low-speed characteristics of the motor operation.At the same time,the 6N137 design is used to drive the high-speed optocoupler isolator,which effectively avoids the interference loop caused by the communication data between the controllers,and ensures the continuous and stable operation of the voice coil motor.Then the AS5311 magnetic displacement sensor is used as the position detection device of the voice coil motor,which avoids the problem of reduced accuracy caused by the influence of dust,temperature and light intensity in the measurement of the grating ruler sensor.This article uses the magnetic stripe polarity change to collect position information.The MAX488 is used to design the SSI protocol for position detection data communication,and the STM32 is used as the main controller for data processing and control to achieve high-precision positioning of the voice coil motor closed-loop control system.Finally,in terms of voice coil motor control strategy,the parameter uncertainty of the voice coil motor servo system model affected by dynamics,external load disturbances and a series of instability problems in signal tracking control are addressed.This paper proposes for the first time that the L1 adaptive control algorithm will be used to realize the voice coil motor servo system control.The working principle of the voice coil motor and the L1 adaptive control theory are briefly studied and analyzed.According to the mathematical model of the voice coil motor,an uncertain parameter model is constructed.,Design a voice coil motor model based on L1 adaptive control,and analyze the experimental results of the closed loop system of the voice coil motor.The results show that the application of the L1 adaptive control method effectively suppresses the high-frequency interference caused by the voice coil motor in operation,can effectively control the tracking error of the voice coil motor and gradually converge,and has a strong effect on the closed-loop control system of the voice coil motor.Robustness,applicable to voice coil motor servo control.