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Max, Bill, I have found that the E12, 15 an 20s
motors are easy to control top speed, when I rewire, mostly with Curtis
controllers, I run the controller on the armger and do F/R with the FWing, I use
the FWing board in one line to the FWing, cutting it in an out with a swt, with
it out of the circuit the fields have 36v on them, with it in the voltag drops
to about 6-7 volts, been there done that. Good Luck
Jerry NW Ohio
ETC...
----- Original Message -----
Sent: Tuesday, December 07, 2010 8:40
AM
Subject: Re: (ET) motors
Very useful data point. That puts my estimates on the
conservative side.
My habit, for good or ill, is to defy my own conservative estimates and
push hardware a little past their ratings. So far, so good: it seems hardware
ratings themselves tend toward the conservative. That's a choice, though, and
caveat emptor.
Our tractors' drive motors are shunt-wound, while CitiCar motors are
series-wound. Series-wound are a little easier to control in EV
applications... to get to higher top speed with shunt-wounds, you have to have
circuitry for field-weakening, and that's marginally more complicated than
just hitting the motor with full voltage from the battery pack.
I am experimenting right now with a HUGE shunt-wound motor in a truck
conversion... and I'll be figuring out field weakening mechanisms a little
later!
-M
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