Design of Ultra-precision Positioning System Voice Coil Motor Driver
The voice coil motor drive unit,incorporating a compliant parallel mechanism,serves as the core component of ultra-precision positioning systems,enabling large travel,high dynamics,and ultra-precision positioning.The motor current driver must posses the capacity to produce current across a wide scale range from microamperes to amperes.In alignment with these demands,a driver design with high bandwidth is proposed for the current loop and high current resolution.Initially,a mathematical model of the drive system considering the motor load parameters is established with an analysis of the stability of the system.Subsequently,the circuit parameters of the driver are refined through opti-mization using the genetic algorithm,thereby enhancing the current loop bandwidth.Ultimately,a real-time simulation control system is constructed utilizing a uniaxial nanopositioning platform driven by a voice coil motor.This system is employed to evaluate the driver's bandwidth,current output capability,and the positioning performance of the platform.Experimental results affirm the accuracy of the design concept and the validity of the theoretical model presented.
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