Re: (ET) E20 motor at 48V

["Hazen, Dwight L" <hazen indiana edu>]

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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