Non-diy_efi, dyno help

[Don.F.Broadus at ucm.com]

By laminated I ment that the motor stator is made up of several thin sheets
of metal stacked on top of each other. Eddy currents are induced into each
small sheet of metal instead of one large hunk of metal, this way the eddy
currents are very small and you have an efficient motor. Transformers are
made with multiple 'E' and 'I' core sheets of silicon steel to reduce eddy
currents. Think of an eddy current dyno as a horribly in-efficient electric
generator
 
Don

> -----Original Message-----
> From:	Todd....!! [SMTP:atc347 at c-com.net]
> Sent:	Friday, June 18, 1999 10:53 AM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: Non-diy_efi, dyno help
> 
> >From what I remember, and I believe I'm close to accurate...
> 
> There are only two known things that reduce inductance, none of which
> are materials themselves, one is distance(i.e. space), the other is
> another EMF(electro magnetic field)(This electromagnetic field
> cancelation effect is used in the donut shaped electronics a lot)
> 
> In other words coating a metal with plastic will not hender the
> inductance(Creation) of electricity... only space and/or another EMF...
> 
> Right?
> 
> So I must ask, from which principle are you deriving that a coated
> stator reduces eddy currents(or feedback currents)?
> 
> Or am I just WAY off, and if so WHY am I way off....
> 
> Just wonderin.........
> 
> Later....
> 
> Todd....
> 
> Don.F.Broadus at ucm.com wrote:
> > 
> > The eddy current dyno uses a iron drum that rotates around an electro
> > magnet. Since the drum is not laminated like motor stators
> > eddy currents are induced into the iron very easy. A chopped DC or
> straight
> > DC voltage powers the electromagnet. The eddy currents slow the drum
> > producing a load and also great amounts of heat. An eddy current dyno
> would
> > make a poor motor since the magnetic losses would be very high. Great
> dyno
> > find, I wish junk yards around here were that good.
> > 
> > Don
> > 
> > 
> > > -----Original Message-----
> > > From: David Piper [SMTP:dapiper at mail.one.net]
> > > Sent: Saturday, June 05, 1999 8:28 PM
> > > To:   diy_efi at efi332.eng.ohio-state.edu
> > > Cc:   brucep at ptd.net
> > > Subject:      Re: Non-diy_efi, dyno help
> > >
> > > Check w/ Mustang Dyno in Twinsburg, OH
> > >
> > > TurboDave
> > >
> > > >My question is this can the eddy current unit from this dyno be used
> to
> > > make
> > > >a motor dyno?