RE: eCycle

[Bob Oldham <boldham@smv.org>]

Seems to me that the best way to deal with this might be to make a strap of,
say, 3/16" aluminum bent in a curve, with fins welded to it, to clamp around
the motor -- it could be incorporated into the motor mount, too. With the
thermal grease it should move the heat pretty well. The heat should all be
in the stator since there are no coils in the rotor.

Bob Oldham

-----Original Message-----
From: Rich Rudman [mailto:rmanzan@tscnet.com]
Sent: Wednesday, November 01, 2000 12:01 AM
To: ev@listproc.sjsu.edu
Subject: Re: eCycle


Russell Levine wrote:
> 
> > > Don't assume the published specs include cooling, they don't. The
> > >  machining on the Ecycle is beautifull... and there are NO cooling
fins.
> > >  Danger Will Robinson, Danger!!. I can see I am going to spend a lot
of
> > >  time hammering this fact home. Reality can be a pretty hot place.
> >
> > They use the frame of the bike as a heatsink.
> >
> 
> How much surface contact would they need to transfer, say 500+ watts of
> waste heat over a minute or two (the most I'd assume their 5Kw motor would
> create at peak current)? It would have to be more than the mounting bolts,
> and maybe even be in intimate contact with a large part of the outer
casing
> (and smeared with heat transfer compound - what a mess!).
> 
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That sounds about right, And they need to fill the windings with
thermall conductive filler to get the heat out to the Aluminum.
Rich Rudman

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