Re: (ET) E20 motor at 48V

[SteveS <stevesgroups verizon net>]

Well, this isn't for an ET. I'm playing around with the  idea of a  EM 
(electric motorcycle). It would be nice to use a motor I already have, 
but it's probably a bit small for this application. So I'm trying to 
figure out if I could safely squeeze a little more out of it.

- SteveS

Hazen, Dwight L wrote:
> Steve,
>
>  Find/build a controller that would limit the voltage and current to a 
> safe level. Do not forget the mower motors and accessories.
>
>  You would then have longer run time and peak performance at the design 
> specification.
>
>   Dwight
>
>
> Dwight L. Hazen
>
> Indiana University, UITS, Networks
>
> Bloomington, In. 47408-7378
>
> 812-855-5367
>
> Ham Radio wb9tlh arrl net http://wb9tlh.ampr.us
>
>
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces 
> cosmos phy tufts edu] On Behalf Of Konstanty, Walter (GE Indust, ConsInd)
> Sent: Wednesday, January 02, 2008 3:15 PM
> To: SteveS; et
> Subject: Re: (ET) E20 motor at 48V
>
> Steve,
>   Without looking at the design info, that's 33% over voltage.
>
> Gain - run faster, more acceleration
>
> Pain - will draw more amps for higher performance, overspeed, insulation
> degradation, commutation distress, running at top speed will probably
> cause banding to fail if motor doesn't flashover first, transmission
> damage if run too fast....basically toast.
>
>   DC Motors are designed using voltage and top speed as key parameters.
> The number of armature conductors provides torque and commutator bars
> are limited by volts per bar (between bars)......at higher voltage that
> is pushed past the limit, the motor can't "commutate" the current and
> blam-o....
>
> ....Walt
> (ex-motor designer - can you tell?)
>
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of SteveS
> Sent: Wednesday, January 02, 2008 2:49 PM
> To: et
> Subject: (ET) E20 motor at 48V
>
> Happy New Year all!
>
> So, what's the gain and pain of running the E20 motor at 48V?
>
> - SteveS
>
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