Fig. 1. Schematic diagram of a VCA-driven balancing scale
Fig. 2. Free body diagram of lever motion in balancing scale: (a) Rotational motion model about a pivot ; (b) Rectilinear motion model
Fig. 3. Structure of VCA
Fig. 4. Equivalent circuit of VCA
Fig. 5. Simulink model of a VCA driven balancing scale
Fig. 6. Experimental setup 1. PC with LabVIEW 2. Power supply 3. VCA driver 4. DAQ board 5. Laser displacement sensor 6. Weighing pan 7. Resistor sensor 8.Voice coil actuator 9. Hinge & Lever
Fig. 7. Effect of BEMF on step response of coil current and lever displacement : (a) kb=0, (b) kb=28.5.
Fig. 8. Effect of magnetic damping coefficient(c) on responses of coil current and lever displacement : (a) c=16.5, (b) c=26.5, (c) c=36.5.
Fig. 9. Behavior of displacement and current during balancing control
Fig. 10. Effect of magnetic damping coefficient on behavior of displacement and current during simulated balancing control : (a) c=26.5, (b) c=16.5, (c) c=0.
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