Robust Control by SOSM Facilitates Optimizing Under Actuated Induction Cap Sealing Process

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Using nonuniformly distributed heat input on thin aluminum foil, the cap sealing process takes care of two activities—sealing and wax removal. Presence of more than one indirectly controlled spatial outputs being controlled by single heat input makes the process as under actuated. The performance of such system is optimal when energy delivered to and utilized by the foil takes place most efficiently. Though better topologies and power devices that have emerged the most influential contribution for such systems has been the use of litz-wire in high-frequency magnetic components. Sharp reduction in high-frequency power loss has enabled simple low-power cooling arrangement. Here, energy utilization is improved when the coil head ensures multizone heating at single frequency on a thin moving foil, whose thickness is negligible compared to its skin depth. Connecting multisegment air-cooled coil in parallel reduces no-load loss as its ac resistance is reduced. It, however, invites two problems, particularly, at no-load—the quality factor is large and damping factor is small. No-load oscillations tend to be more and the undamped voltage across the tank capacitor is high. This paper demonstrates how the introduction of robust control concept such as second-order sliding mode can resolve this weakness and help the system achieve its near optimal performance.