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Re: [EVDL] 9" adv Aluminum feild coil housing ?

Ok,
Ill just look else where :(
I love the power of the 9", wont be getting rid of it.
Thanks,
Jeff


--- Jeff Major <[email protected]> wrote:

>
> Hi Jeff,
>
> Milling channels or grooves across the length of the
> frame will increase the reluctance of the back iron.
>
> In other words, screw up the magnetics. Result will
> be decreased torque per amp. There are certain
> areas
> of the frame more critical than others. So if you
> carefully removed material in the right spots,
> effects
> on performance would be minimal. This might require
> more of an artist than a machinist.
>
> This is quite difficult to explain without drawing a
> picture. And I can't do that in this format.
> Perhaps
> you can find something on a web search or in a text
> book. A 3D magnetic finite element analysis diagram
> of the field structure would be perfect.
>
> IMHO it is a lot of work for a small gain. Removing
> excess electrolyte from the batteries might be more
> fruitful :). Or swap your big 9" for a smaller
> motor.
>
> Jeff M.
>
>
> --- Jeff Mccabe <[email protected]> wrote:
>
> > Thanks for your reply Jim,
> > Seeing how you need the ferrous material for the
> > motor to work properly. How about if you make Ball
> > end
> > mill channels, say half the thickness in depth
> along
> > the length of the motor circumference ? (o.d) This
> > way
> > your just remove access material but still have
> the
> > original body ?
> > Yes you could remove to much and weaken the
> > housing,
> > but you and other motor builders do remove
> material
> > from the outside and don't appear to have problems
> ?
> > I don't know.....just ideas. I have a road
> racing
> > background, so this should explain my weight
> > obsession.
> > To date I have removed well over 1,400lbs from my
> > Porsche already and have my eye on another
> 150-200.
> > Thanks,
> > Jeff McCabe
> >
> >
> >
> > --- Jim Husted <[email protected]>
> wrote:
> >
> > > Hey Jeff, all
> > >
> > > I got Jeff's and then Lee's reply to this before
> I
> > > got
> > > the actual post. As they pointed out, it's part
> > of
> > > the motor you got to live with. Reminds me of
> the
> > > song "He ain't heavy... He's my motor.. lol.
> > >
> > > Lansing Bagnall actually makes a motor with an
> AL
> > > housing. They set the field coils into a
> > laminated
> > > steel core that inserts into the outer AL
> housing
> > > shell. Laminating allows you to do more with
> less,
> > > but
> > > not that much more.
> > >
> > > I've also seen an almost all AL aircraft starter
> > > where
> > > just the poles, arm body, bearings and shaft
> were
> > > steel. Almost threw my back out as it looked
> like
> > > it
> > > weighed 80 lbs and wieghed only 35 lbs or
> > whatEVer.
> > > The problem with AL field coils is attaching it
> to
> > > the
> > > terminals, and is a major weak link area on
> EVery
> > > style I've seen to date. It was also as Lee
> > stated,
> > > high RPM's low torque.
> > >
> > > I've thought about what it'd take to make a
> > > laminated
> > > housing with a lightweight strong skin to hold
> it
> > > tight and true. In the end, if it were that
> much
> > > better then it's how it'd be done. What's one
> > > willing
> > > to pay for a percent or two? To create a new
> > > housing
> > > for let's say a 9'er and to compare would be a
> fun
> > > thing to try, if one has the time. Anyway
> that's
> > my
> > > take on it.
> > > Cya
> > > Jim Husted
> > > Hi-Torque Electric
> > >
>
>
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