Study On Drive Control Of Linear Electromagnetic Actuator

At present, for the study of the linear electromagnetic actuator application, researchers mainly focusing on two directions: providing high-frequency and highprecision linear displacement and linear force for the precise position servo system & working as a stable and sustainable source with high-thrust power.The VCM, as the new generation linear electromagnetic actuator, basing on Lorentz force which proportional to the current input and realizing motion and power output through VCM mover, has simple but reliable structure, high working efficiency, clarity control theme and excellent output performance characteristics. It has a wide range of applications around High-Frequency, High-Precision Fields such as Optical System, High Finish Machining, Semiconductor Equipment, Medical Equipment, Robotics and UltraStabilization Bit Platform. Simultaneously, it also has unique application advantages during High Power Actuating Systems such as Rail Transit System, Maglev Train, Vehicle Active Suspension System, Vehicle-mounted device, etc.In this paper, the drive control strategy research is regard VCM as the controlled object. The main research contents are as follows:Firstly, do a brief introduction about the VCM structure, classification and application as a stroke. Build up the Mathematical Model and transfer function based on the Voltage Balance Equation and Dynamic Equation. Considering the actual working conditions of the VCM, the Dynamic Characteristics & Optimum Drive Control Parameters analysis under Stable-to-Stable Transition Process of the VCM are inferred.Secondly, design the Closed-Loop drive control system based on the results of the aforementioned chapters. The whole drive control system consists of Current Loop, Speed Loop and Position Loop. In order to improve the Dynamic Response Accuracy, Response speed and output performance, system correction are execute with Current Loop PID Regulator, Speed Loop PID Regulator and Position Loop PID Regulator. Under the MATLAB/Simulink Model of the VCM Drive control system with specified VCM parameters. Step stimulus and sine stimulus are exerted to test the performance of VCM. Moreover, limitation of motor output capacity with specified motor parameters are discussed from the simulation outcomes, which provides a reference for VCM type selection in application.Thirdly, doing drive control verification based on the ultra-stable vehicular platform. Using VCM driving model to instead the given control force for the active isolation control of the ultra-stable vehicular platform. Simulate for control performance of the platform isolation under sine base disturbance, random base disturbance and direct disturbance to have a verification of VCM drive control system capability.Finally, build up the VCM drive control hardware system. dSPACE real-time simulation system is used as the Control module. The drive module is divided into multiple submodules including Power module, Tri wave generation module, dual PWM wave accompanied with dead time generation module, H-bridge PWM power convertor module and current detection & isolation amplifier module. The Status of the VCM mover are detected by laser speed DME PDV-100. which provide a hardware environment for VCM drive control.