Originally posted by mr.clean
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dynamo electric machines. The automatic brush position adjusters are
solenoids designed to move the brushes to a position relative to the strength
of the currents through the solenoid coils. These regulators either shunt part
of the field current or restrict the field current in the machine by other means
such as counter or cancelling emf's in order to regulate the output from the
armature, the stronger the excitement of the field magnets the more power is
produced from the armature or generating element. By regulating the field
currents relative to the load the machine is more practical.
Much like the regulator in a car alternator regulates the current through the
rotating field winding to regulate the output of the generating stator coils.
I showed in this experiment the regulating/magnetizing DC current can be utilized.
Alternator Test - YouTube
At about 2:20 minutes I switch out the regulator so that the 21 Watt bulb is
the only load regulating the magnetizing coil current. The actual alternator
output was to the big battery. The bulb regulated the charge current down to
about 4 amps from about 8 amps by restricting the current through the
magnetizing coil. Usually the regulation is done with a transistor and/or
resistors to restrict the magnetizing current..
Cheers
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