Re: (ET) Motor Break in

[Chris Tromley <ctromley gmail com>]

I'm not so sure about that.  I'm not an authority and I've been off
the EVDL for years now.  But common knowledge there is that new
brushes take awhile to bed into the commutator.  There have even been
cases where brushes were supplied with no curvature at all.

On an EV that will be drawing hundreds of amps almost constantly,
getting the brushes to mate with the commutator before loading it will
reduce arcs and sparks.  I'd pull a brush or two and see how much of
the available area is actually contacting the commutator.  If it was
over 50% I'd drive it easy for 100 miles and then let 'er rip.  If not
I'd do some sort of bed-in procedure.  I remember people saying to
hook up a constant 12V supply (won't cause overspeed on a 96V rated
series motor) and let it run for hours.

Chris

On Tue, Jul 21, 2009 at 10:59 AM, Konstanty, Walter (GE Infra,
Energy)<Walter Konstanty ge com> wrote:
>   On electric motors, there is no break-in period.  DC motors are usually
> load tested to overload and ac motors are at least no load run.  Bearings
> and brushes are seated to allow immediate full load operation.  
> Insulation
> hi-pot and resistance tests check integrity of the system.
>
>   On large DC machines we run them to build a film up on the commutator.
> Industrial customers do not baby machines so they are designed to run at
> rating out of the box.
>   As Dennis states, drive it like you stole it.
>
> ...Walt Konstanty
> GE Motors
> ________________________________
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of RJ Kanary
> Sent: Tuesday, July 21, 2009 10:51 AM
> To: Pestka, Dennis J
> Cc: Elec-Trak Email Discussion List
> Subject: Re: (ET) Motor Break in
>
>        What does the manufacturer recommend? If it is a brush less 
> motor, I
> can't envision any break in being necessary. Drive it like you stole it. 
> <G>
>
> RJ
>
>
> Pestka, Dennis J wrote:
>
> Now that I have my 65 Datsun truck running, I would like some
> suggestions on breaking in the motor.
> At present the motor probably only has ~ 2 hours on it.
>
> Should I try to drive at a certain RPM ?
> Is keeping the RPM higher better than lower ?
> Any other suggestions ?
>
> Motor - FB1-4001A Advanced 9".
> (13) 156V of  Odyssey PC-1750 Batteries.
>
>
> Thanks;
> Dennis
> Elsberry, MO
> http://www.evalbum.com/1366
>
>
>
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