Nonlinear Contour Tracking of a Voice Coil Motors-Driven Dual-Axis Positioning Stage Using Fuzzy Fractional PID Control with Variable Orders

<div>Design of flower contour command. (a) Flower contour in <i>X</i>-<i>Y</i>-axes; (b) mover commands of flower contour in <i>X</i>-axis and <i>Y</i>-axis.</div>

Mathematical Problems in Engineering

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Figure 7

Figure 7: Nonlinear Contour Tracking of a Voice Coil Motors-Driven Dual-Axis Positioning Stage Using Fuzzy Fractional PID Control with Variable Orders 

Figure 7 | Nonlinear Contour Tracking of a Voice Coil Motors-Driven Dual-Axis Positioning Stage Using Fuzzy Fractional PID Control with Variable Orders 