Energy conversion difference in permanent magnet vs. field coil motor

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SUMMARY

The discussion centers on the energy conversion differences between permanent magnet DC motors and field coil DC motors. It is established that in a field coil motor, the current required to maintain the magnetic field does change with the load, while in a permanent magnet motor, the field current remains relatively stable regardless of load. The resistance of the field winding in field coil motors is significantly higher than that of the armature winding, which influences the energy dynamics during operation.

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  • Understanding of DC motor operation principles
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  • Familiarity with electrical resistance concepts
  • Basic grasp of load effects on motor performance
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Electrical engineers, motor design specialists, and students studying motor technology will benefit from this discussion.

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.
 

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