 induction heater theory
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IamSmooth
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Mon Nov 30 2009, 02:04PM
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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
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Posts: 1567
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What is more important here, or is it both:
Current in the workcoil is needed to create a current in the workpiece. Voltage in the workcoil is needed to induce a voltage in the workpiece; the higher the voltage the higher the workpiece current. But if the workcoil resistance is high when the voltage is high, the workcoils current will be low. Wouldn't this affect the magnetic field for inducing the current in the workpiece?
Then, there is the issue of coupling. The tighter the coil to the workpiece the better the energy transfer, right?
I guess the calls upon a good understanding of transformer theory.
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Tonskulus
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Registered Member #1223
Joined: Thu Jan 10 2008, 04:32PM
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Posts: 133
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More reactive power on workcoil -> more heating effect. You can get same heating power by using either low voltage/high current single turn workcoil or high voltage/low current multiturn coil if actual reactive power is the same in both cases.
Few more examples:
Same heating effect/power can be achieved:
1turn coil @ 100Amps coil current
2turn coil @ 50Amps coil current
OR:
1turn coil @ 400kHz / 100A
2turn coil @ 200kHz / 100A
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