[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: (ET) NEED E-15 Traction motor profile to program Sepex controller (1268)
Hi Chris (& all),
75% amp limit is good idea. And easy.
Even smarter if I also drilled a dimple in side case of traction motor,
and installed temperature sensor.
Combine that with David and your suggestion of second controller for PTO.
Temperature sensors on tiller and chip/shred motors would be smart,
since they get run in warmer weather.
Could even add a third controller for lift, since I don't want to run
that at 48V.
[LIFT: Ken Olum suggested study of Electric Ox lift solution. Linear.
strong. but $$$. I have a 12V hydraulic pump assembly from bus wheel
chair lift that should easily run a small cylinder. The wheel chair
lift was rated 800 lbs using that pump & 2 cylinders, so 400 lbs max,
depending on framework. I think 60 amps rating for that pump]
And a 4th controller for my 2 12V LED 500lm each headlights (wired
parallel), pack tapped.
But a better solution for lights might be add 2 more 12V, and run all 4
in series (48v, no pack tap).
Of course, 1 dies kills string problem there.
But, overall, no battery taps & uneven pack discharge.
Thank you, group (sadly smaller than 20 years ago), for suggestions, &
insights,
John
p.s. In my recent info search, I looked through FB Elec-Trak group.
found mostly pictures, & videos, but did not see technical discussion.
Is there more info there, that I missed ?
On 12/27/25 21:56, Chris Zach via Elec-trak wrote:
Same speed would make perfect sense if the armature and the field were
both run at the same voltage on a shunt motor. You will just have 25%
more power (which could get into "break things" territory if not
limited) or 25% less current draw on the wires for the same given power.
Actually if you limited the current to 75% of what a normal E15 pulls
you would get lower voltage drops across the unit. That could be cool,
but it would overspeed the snowblower unless you use a second
controller for that.
Side note, I've been running my lift motor at 36 volts for a decade
now. Works fine, goes up and down quickly (series motor) and with a 10
amp fuse I don't have to worry about ripping out the deck's lift
point. (Note, running at 36 volts will fuze the internal current
disconnect shut. Sucks, but you can let the deck fuse serve that
function. Just... don't use a 30a fuse). The motor puling only 1/3 of
the amps really makes a difference in lack of voltage drop in the wires.
On 12/27/25 21:13, David Roden wrote:
I think it depends on how much you want to optimize things. Bear in
mind
that the later ET PM motors didn't (couldn't) have field weakening.
If memory serves, and it might not as it's been many years, Mark
Hanson ran
an E15 with full field and 48 volts from his own homebrew PWM armature
controller. I think he got about the same top speed as on 36 volts with
the factory field weakening. He had a second controller to drop the 48
volts to 36 volts for the attachments. If he's still on the list, maybe
he'll chime in with comments and corrections.
David Roden - 25 Years with ETs
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Note: mail sent to the "etpost" address will not reach me. To send
me a private message, please use the address shown at the bottom
of this page : http://www.evdl.org/help/
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak