[TheForge] [OT] Re: Variable-speed motor & controller

[Mike Spencer]

me> ...10" cast-iron wheel on bearings faced with a copper disk (sort
me> of like a clutch-plate lining) and two electric coils.

Bruce> Sounds like a Faraday disk!

Looks like one, too, only it's clearly not meant togenerate electricity.

Two coils so arranges that their iron cores point at the disk (ergo
their magnatic fields are perpendicular to the disk and parallel to
its axis) are positiones at (roughly) 6 o'clock and 8 o'clock and a
few millimeters from the disk.  The disk has a small belt pulley on
the opposite side.

James Binnion> That is the variable load, used to adjust the
James Binnion> difficulty of the workout

That's what I assumed.  I don't have whatever it came off of.  I don't
know if DC would work to get braking action or if you have to have AC.
The mathis too hard for me (Okay, it was too hard for Faraday, too :-)
bit it makes sense that with AC and the offset position of the
magnets, you'd get a mare's nest of opposing eddy currents. I'll have
to experiment some time when I have nothing better to do. ;-)

Bonus OT question for anybody who's gotten this far:  Can I plug a 2HP
motor that's plate-rated for 208V single phase into a ordinary
(nominal) 240V line?  (My line voltage measures 230V.)  There's no
mention on the plate of multiple voltages, 3-phase or anything like
that.  Just 2HP, 208V, Phase 1.  Lots of stuff online by/for people who
want to plug 240V single phase motors into two legs of their
3-phase service or their 208V service but little clear advice for me.
Doesn't sound promising.   


- Mike

-- 
Michael Spencer                  Nova Scotia, Canada       .~. 
                                                           /V\ 
mspencer at tallships.ca                                     /( )\
http://home.tallships.ca/mspencer/                        ^^-^^