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The Thin Sleeve
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60 cycles Affects Electrical Efficiency aluminum aluminum bar amperes amps center temperature coil and workpiece coil circuit coil current coil resistance conductor contd copper Curie temperature current path currents induced curve depends depth in copper diameter to reference Dielectric heating eddy currents electrical efficiency electrical resistivity equation equivalent resistance equivalent sleeve Example flux hardening heat energy heated by induction higher frequency hysteresis inches long increases induced current induction heating coil induction heating machines Inductor inside length less lines of force load magnetic field method microhm-inches nichrome strip number of turns ohm-inch permeability portion power developed Question R2eq reference depth reflected resistance resistance factor room temperature round workpiece skin effect solenoidal solid bar Solid Workpieces space factor specific heat stainless steel Step surface and center temperature difference thermal conductivity thin sleeve total power vacuum tube voltage induced wall thickness watts workpiece resistivity