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Re: (ET) E-12 motor type]
Bill A: You CAN do just as you suggested, though 2V (as someone said) is kinda low.
I have been running one of my E-15s with a series-type Curtis controller for the last two snowplowing seasons, like this: Engage the vanilla Curtis pot-box and the microswitch closes relays for full voltage across the field terminals, then the armature current alone is driven by the controller output. Crude, but it works great. (No field weakening, so I have feeble top speed; thank goodness for the 4-spd ET gearbox.) I threw this together after this particular tractor was vandalized and snow was coming, and I haven't had time, or the need, after all, to fix it, though I mean to.
There was a run of Curtis Sep-Ex controllers on eBay for a while, with specs that were just fine for the ETs... I bought two for short money, one for each of my E15s. I look forward to reporting on how they work... when, on some fine day, I get to the job...
-Max
On Sun, Apr 18, 2010 at 5:51 PM, RJ Kanary
<rjkanary consolidated net> wrote:
I don't think that's the case.It is a shunt wound
motor.Note the two field leads in the four position connector that also
contains leads for the Klixon® limiter in the field windings.
What IS unique about these motors is the lack of a series field, such
as found in the E-15 and E-20 traction motors.
RJ
Bill Alburty wrote:
Thanks to
all for the help in identifying the type of drive motor I have in my
E-12. I know now that it is a series wound type, so I now want to find
a PWM controller that will work with it. I have no idea what the
Alltrax, 4QD, or Curtis controllers cost or where to get them. I'd also
like to know how the operator controls the speed with them. Is it
with a knob on a potentiometer, a foot accelerator, or by modifying
the existing lever?
Since I understand PWM generators don't work with series wound motors,
I made some measurements on the series wound motor in my Cushman
electric golf car, which is about the same size as in my E-12. While
driving around the yard, the field winding measured about 2 VDC and the
armature had 30 some VDC. As David Roden suggested, why couldn't I
provide 2 VDC independently to the field winding, while using PWM to
the armature? Would additional inductance or anything else be needed?
Has anyone tried this?
Thanks for any info.
Bill Alburty
E-12 in Kansas
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