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E Coil / µ J F / mN 300

E Coil / µ J F / mN 300 290 280 270 260 250 240 230 220 210 200 5 – ANALYSIS, CALCULATIONS AND EXPERIMENTS 190 0 0.5 1 1.5 d / mm 2 2.5 3 Figure 5.10: Helmholtz VCA energy optimization curves. 30 20 10 0 −10 −20 −30 −40 −50 −10 −8 −6 −4 −2 0 x / mm 2 4 6 8 10 Figure 5.11: Result of the Helmholtz VCA force distribution measurement with d = 1.7 mm. 44

5 – ANALYSIS, CALCULATIONS AND EXPERIMENTS Figure 5.12: Step response oscillograms of the equal coupled (left) and the anti-coupled (right) Helmholtz VCA. The upper curves show the magnet’s step responses of the stroke x measured with a capacitve sensor in USensor = 2 V/DIV and the lower curves show the induction voltages measured in Uind = 10 mV/DIV. The abscissa is measured in t = 20 ms/DIV. 45

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