Energy conversion difference in permanent magnet vs. field coil motor

AI Thread Summary
In a DC motor, the current needed to maintain the magnetic field does change with the load, particularly in field coil motors. For permanent magnet DC motors, the magnetic field is constant and does not require additional energy as the load increases. The field winding's higher resistance compared to the armature winding affects the current flow, but the field current remains relatively stable under varying loads. This stability in field current is a key difference between field coil and permanent magnet motors. Understanding these dynamics is essential for optimizing motor performance.
BruceRH80
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New here, hello all.
My question is more about the field magnet in a running DC motor. First of all, does the current required to maintain a magnetic field change with the load on the motor? And if so, where would this "extra energy" come from in a permanent magnet DC motor?
 
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The field winding has higher resistance then the armature winding (perhaps three orders of magnitude?). I don't believe the field current changes much with motor load.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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