A sepex motor can do great regen. My sepex car would do 500+ A regen. My sepex
lawn tractor does regen if you slow suddenly. No controller is required for
regen, you just have to push the motor faster than key speed by downshifting or
going down hill (or pushing by hand in the case of the tractor).
Steve: Do you know how many Amps it pulled spinning on 12V?
Steve: What is the goal? If they just want to slowly move things in a freight
yard or campus environment, just idling the motor at ~2000 rpm and using the
clutch and gears isn't elegant but might be good enough.
Some folks suggested voltage switching and field control. I imagine a 2600 lb
motor has a monstrous amount of inductance, you'd have to plan for that. You
might need to do a bunch of contactors in parallel and series to handle
breaking current on something with so much inductance. A car controller might
not be able to handle so much inductance unless you ramped the current very
slowly. Be sure to put some big diodes on both field and armature, so inductive
kickback doesn't kill the contactors.
I'd humbly suggest putting a reed switch on the field that disables the
armature contactors unless there is sufficient field current. This protects
against no field current = blown motor. This has a secondary benefit. The field
inductance is very high, so ramping up its current takes a while. With the reed
switch it makes sure the field is ramped up before the armature gets going. I
did this on my sepex tractor and it works great.
I would be really nervous about experimenting and figuring things out with a
2600 lb motor. Inductive kick back could be lethal, an overspeed could be
lethal, a startup jerk could rock the truck off its jack stands... Also, the
motor would be very costly to replace. I would humbly suggest figuring things
out on a small, cheap sepex motor first.
----- Original Message -----
From: Bruce EVangel Parmenter
Sent: 08/12/13 07:35 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] S.E.P.X . controller for 500V , 450Amp Motor
The previous post I made on this topic listed AC and DC controllers. For such a
heavy EV, it really makes sense to have regen, not only to regain some energy,
reduce brake wear, and the dynamic braking is safer driving (you have both the
motor and the friction brake to slow/stop the heavy EV. An AC controller
usually offers regen. But if you have your heart set on using DC, I was also
thinking that both the 1k and 2k Zilla controllers come in an EHV model which
is rated at 380VDC. {brucedp.150m.com} -- http://www.fastmail.fm - Or how I
learned to stop worrying and love email again
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