Physical limitations of electromagnetic induction

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SUMMARY

The discussion centers on the physical limitations of electromagnetic induction in the context of building a small induction motor. It is established that while there is no theoretical limit to the induced electromotive force (emf) from magnetic flux in a resistance-less wire, practical limitations arise due to the resistance of the wire used. Longer wires introduce more resistance, which negatively impacts current and, consequently, the motor's output. Additionally, the motor's speed remains constant, dictated by the frequency of the supplied AC, but torque may decrease with excessively long wire lengths.

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Hello.

I am making a small induction motor and have been wondering about it's limits. I have googled a lot and can't find a helpful answer.

Is there a maximum length of coil that a magnetic flux of specific strength can excite ?


Thank you,

Gary.
 
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There is no theoretical limit to induced emf from flux if your wire is resistance-less. Yours probably isn't, so, since a longer wire would have more resistance, which affects current, which in turn affects the motor's output, there probably are limits.

The speed of the motor probably wouldn't change, as that is controlled by the frequency of the AC supplied to it. Instead, you might get less additional torque for additional length, if you use an extremely long wire. I wouldn't worry about it too much, though.
 
Thank you Livect.
 

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