Re: Shunt field motors

[Victor Tikhonov <vtikhono@lsil.com>]

Rather than lifting the brushes you electrically disconnect them
(contactors, IGBTs,...).

Sorry, I didn't think it needed mentioning...

Victor

Paul G wrote:
> 
> Victor wrote:
> >I guess I didn't explain my thought very well.
> >
> >The idea was to have extra set of identical thickness brushes,
> >so they still short two bars.
> 
> Yes, but the unused brushes would have to be lifted when not in use. The
> regen brushes also must cover 2 com bars, but not the same 2 as the
> traction brushes (one forward of neutral one aft of neutral). So, when in
> traction mode an armature turn is being shorted by each regen brush (in
> each brush location, generally 4 total).
>