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Unlike general-purpose relays, contactors are designed to be directly connected to high-current load devices and to last for thousands of operational cycles. The main

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Unlike general-purpose relays, contactors are designed to be directly connected to high-current load devices and to last for thousands of operational cycles. The main failure mode in contactors is electromagnet fatigue-due to the formation of foucault's currents and the strong mechanical impact when opening and closing the circuits. To mitigate this failure mode, the electro- magnet evolved into a laminated design, as shown below. In this particular case, the electromagnet core is composed of 28 steel sheets each with a thick- ness of tg = 1.00.12 mm, and the bracket for the assembled electromagnet core has design thickness of the = 28.20.6 mm. (A) What percentage of tbc assemblies (core + core-bracket) will have a clearance less than 0.1 mm. (B) What percentage of assemblies will have a clearance less than zero (not fit). (C) If no more than 2% of assemblies should have a clearance less than 0 mm, to what value does the core-bracket size has to be increased if all other dimensions and tolerances remain the same?

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