Electromagnet: Current or Voltage??

Jasen Betts · Sep 7, 2005

Sorry about the ambiguity.

This is an experiment in Torque.

I'm building a motor from a different point of view. Instead of
rotating the coil in a magnetic field, I'm mounting the magnets
(1"x1/8" NEO disks) on the rotor and spinning the magnetic field.
Click to expand...

this is not a new idea, the fans, inside your PC work on this principle...
permanent magnets on the rotor, and and tre field switched eklectronically.

I want to use the coils, mounted in planetary fashion, like spark plugs
in an engine with an adjustable "distributor" (armature) for energizing
the coils mounted on the rotor. When the rotation of the magnets reach
approximately 75 degrees to the coils, The coils (electromagnets) will
energize wrenching the magnets toward 90 degrees but will de-energize
before the poles try to cog on each other.

At this time, I have no Idea what the RPMs will be so time for me is a
best guess. I'm thinking low milli for about 13 degrees of rotation.
Click to expand...

13 degrees, (and presumably another 13 degrees with reversed polarity later
on) that's about 7% duty cycle

from my calculations yesterday I wouldn't want to see the motor stall for
more than a few seconds, but once it's running at speed there's be a back
emf that'll reduce the current and stop the electromagnets from frying.

Bye.
Jasen

John Fields · Sep 7, 2005

all else being equal thin wire 1200 turns and 12V x 1A will get you the same
efficiency as thick wire, 100 turns and 1V x 12A

turns take length of wire that means resistance and resistance reduces the
amps. you can't have both.
Click to expand...

Electromagnet: Current or Voltage??

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