Velocity control of Voice Coil Actuator using Field Programmable Gate Array

Voice Coil Actuators (VCA) find extensive applications across various domains such as loudspeakers, disk drives, and optical storage devices. Achieving precise velocity regulation poses a significant hurdle in effectively controlling VCA. This challenge arises due to the inherent dynamism and complex nonlinear attributes of VCA. This paper introduces an innovative FPGA-based velocity controller tailored specifically for VCA. The proposed controller integrates a dual-control approach comprising feedforward and feedback mechanisms to realize accurate velocity regulation. The feedforward component leverages a VCA model to anticipate its velocity based on the input current. Conversely, the feedback mechanism employs a Proportional-Integral-Derivative (PID) controller to rectify discrepancies between the anticipated and actual velocities. Experimental assessment of the proposed controller was conducted on a prototype VCA system. The outcomes demonstrated the controller's capability to achieve precise velocity regulation, even in the presence of external disturbances. Moreover, the controller exhibited adeptness in accurately tracking intricate velocity profiles. Compared to conventional analog controllers, the FPGA-based velocity controller offers several advantages. The versatility of the proposed controller renders it well-suited for an array of applications spanning robotics, automation, and industrial control.