[milwaukee-electric] Re: KMCL/National City Lines.

[William Sell]

Yes, it helps.  There are gaps in my electrical intelligence (motors 
for one), but I have some background and get the general idea.

Thanks
Bill




At 11:39 PM 3/29/2011, Scott Greig wrote:
>I hope all of that at least made some sense...this is one of those 
>things I can explain in pictures better than in words!
>--- On Tue, 3/29/11, Scott Greig <sbgreig_m1 at yahoo.com> wrote:
>
>From: Scott Greig <sbgreig_m1 at yahoo.com>
>Subject: [milwaukee-electric] Re: KMCL/National City Lines.
>To: milwaukee-electric at lists.dementia.org
>Date: Tuesday, March 29, 2011, 11:05 PM
>
>Field tapping is a means of increasing motor speed at top 
>output.  Each field coil in the frame is essentially two separate 
>coils wrapped together and wired into two separate series 
>circuits.  In normal operation, the two circuits are working 
>together.  When the field tapper kicks in (usually on the last point 
>of the controller), the smaller of the two coil groups is cut out of 
>the circuit, which reduces the field strength and enables the 
>armature to spin faster.
>The electrical resistance of the motor circuit has to be factored 
>into the design, which means that some applicatons--like TMER&L's 
>1180-series duplexes--actually have a separate field tapper for each 
>motor truck, to reduce any variances or issues in electrical 
>resistance.  This may be why Cold Spring was unable to put tappers 
>on all the 1030s...they may have had to use more than one for each 
>trainset, and may simply have run out of them.
>
>An interesting side effect of installing field tappers on the 1030s, 
>though, was that the trains began having motor failures left and 
>right.  While I don't know the full details of what was going on 
>there, I have heard speculation that field-tapping the 1030s' motors 
>may have caused them to overspeed during sustained running, and 
>either flash over (because electrical commutation was disrupted) or 
>"birdnest" (the armature coils pull out from centrifugal force and 
>cause a big mess).
>
>Hope this helps....
>
>--- On Tue, 3/29/11, William Sell <sunrise at bikethehoan.com> wrote:
>
>From: William Sell <sunrise at bikethehoan.com>
>Subject: [milwaukee-electric] Re: KMCL/National City Lines.
>To: milwaukee-electric at lists.dementia.org
>Date: Tuesday, March 29, 2011, 9:55 PM
>
>What is a field tapper?
>Bill
>
>
>
>At 01:11 PM 3/29/2011, you wrote:
> >Group:   As I was working at the GE Apparatus Service Shop, 940 W.
> >St.Paul, I ate my lunch while visiting with Bill Schwerin... at his last
> >stand office in a container car body next to the deck behing the then GE
> >Building.
> >
> >He said that Jay Maeder was so anxious to acquire the remaining linss to
> >Waukesha and Hales Corners that, he was easily enticed to accept any
> >arrangement toward purchase.  As it was, Jay did get the Waukesha
> >operation from Greyhound and he needed the 1031-32 to 1049-50, duplex
> >trains to handle rush-hour heavy traffic.  The first eight of these
> >trains were fitted with field tappers, the last two trains didn't get
> >them.  Why Not?
> >
> >Bill Schwerin told me that Jay was too anxious and The Transport Company
> >took advantage of that.  Bill said that Jay could have had much more,
> >than what he got.  Jay was so eager, that he accepted the liability of
> >the Soldier's Home accident.
> >
> >Don L .
>
>**********************************
>"So much has been destroyed, I have cast my lot with those who, age
>after age, perversely, with no extraordinary power, reconstitute the
>world." -- Adrienne Rich

**********************************
"So much has been destroyed, I have cast my lot with those who, age 
after age, perversely, with no extraordinary power, reconstitute the 
world." -- Adrienne Rich