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| Ev Archive for January 2001 |
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| 1553 messages, last added Wed Aug 08 18:50:49 2001 |
[Date Index][Thread Index]
[Fwd: White Zombie an' Stuff]
> John Wayland wrote:
>
> SNIP SNIP If you were to electrically shift the motors into parallel at
>
> > this exact point, the controller's output would fall from 240v to 120v as the motors load
> > it down. At this point, the current would soar back up, and the motors will start to pull
> > all over again. Hopefully, with a new battery pack, with the motors both pulling hard
> > starting at 120v each, they might spin up to where each motor sees 135v or so. By dropping
> > in a lower 4:38 ratio, the car will be an animal off the line, and the parallel thing will
> > work even better. The beauty of this whole thing, is that the motors never see a drastic
> > overvoltage thing....just very high currents!
> > Of course, I could be all wrong here, but so far, I've been more right than wrong.
>
> Hi john; Yur on the right track and on the right train of thought. Subway, trolley cars
> and older locomotives have been doin' this for over 100 years. We used to "Shift" them from
> series to parallel when engine speed, Diesel. sounded about right and voltage rose an' amps
> dropped..STILL a few of these hand bombers around even today! They werte the early Diesels
> that replaced steam. Series parallel transition as we call it was pretty much automated(Sigh)
> by the 60's Sounded like shifting gears on an ICE. Did the same thing, electrically. Now they
> leave all the motors, 4 on a 4 axle machine, in parallel and do the control electrically.
> Easier to control wheelslip this way. Two traction motors in series or four, for that matter,
> can be a handfull when one beaks loose and gets all the voltage that the 4 were sharing a
> second ago. Very picturesque,especially at night,rings of fire on every wheel on that axle,
> but hard on the equipment. Don't think this will be a problem on the Zombie, as his motors
> are locked together mechanically, right? On the driveshaft, to the Ford 9" rear end. NOW,
> whenyu make" transition" it should go like hell! Just my opinion<G>!
>
> >
> > with my direct drive stuff as used in the Zombie. I guess we'll all have to wait and see
> > what happens in a couple of months.....still hoping Hawker pulls through with my new
> > batteries!
>
> YES! YES! the new cells should help here! I remember the "Smokers" at "Wouldburn" last
> summer!
>
> > Bob ...back in electric RR land
John Wayland wrote:
SNIP SNIP If you were to electrically shift the motors into parallel at
> this exact point, the controller's output would fall from 240v to 120v as the motors load
> it down. At this point, the current would soar back up, and the motors will start to pull
> all over again. Hopefully, with a new battery pack, with the motors both pulling hard
> starting at 120v each, they might spin up to where each motor sees 135v or so. By dropping
> in a lower 4:38 ratio, the car will be an animal off the line, and the parallel thing will
> work even better. The beauty of this whole thing, is that the motors never see a drastic
> overvoltage thing....just very high currents!
> Of course, I could be all wrong here, but so far, I've been more right than wrong.
Hi john; Yur on the right track and on the right train of thought. Subway, trolley cars
and older locomotives have been doin' this for over 100 years. We used to "Shift" them from
series to parallel when engine speed, Diesel. sounded about right and voltage rose an' amps
dropped..STILL a few of these hand bombers around even today! They werte the early Diesels
that replaced steam. Series parallel transition as we call it was pretty much automated(Sigh)
by the 60's Sounded like shifting gears on an ICE. Did the same thing, electrically. Now they
leave all the motors, 4 on a 4 axle machine, in parallel and do the control electrically.
Easier to control wheelslip this way. Two traction motors in series or four, for that matter,
can be a handfull when one beaks loose and gets all the voltage that the 4 were sharing a
second ago. Very picturesque,especially at night,rings of fire on every wheel on that axle,
but hard on the equipment. Don't think this will be a problem on the Zombie, as his motors
are locked together mechanically, right? On the driveshaft, to the Ford 9" rear end. NOW,
whenyu make" transition" it should go like hell! Just my opinion<G>!
>
> with my direct drive stuff as used in the Zombie. I guess we'll all have to wait and see
> what happens in a couple of months.....still hoping Hawker pulls through with my new
> batteries!
YES! YES! the new cells should help here! I remember the "Smokers" at "Wouldburn" last
summer!
> Bob ...back in electric RR land
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