 self excited homopolar generator (no PMM!!!)
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hen918
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Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
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Salvador wrote ...
So it seems taht the only generator that uses only lorentz effect alone is the homopolar generator /faraday disc?
because even a traditional dc generator with commutator has a slightly varying magnetic field in it's coils even at the output , the very reason actually why they make 4 and more poles on the rotor is for the output waveform to have as little variation as possible yet it's still not flat DC, corect? so a typical DC generator with rotor and commutator is still basically a somewhat AC machine and induction applies to it ?
Well, to summarise: Induction applies to pulsed DC and AC, but not to perfectly smooth DC. homopolar generators produce smooth DC, because there isn't a varying magnetic field inducing current in a coil. Even DC (brushed) motors and generators, produce AC and then use the brushes as an electromechanical rectifier, switching the polarity at every pole to keep the positive on one line and the negative on the other. To get smooth DC from a brushed DC motor one would, therefore, have to use a smoothing capacitor.
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