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RE: (ET) chargers
- Subject: RE: (ET) chargers
- From: "David Roden (Akron OH USA)" <roden ald net>
- Date: Wed, 1 May 2002 21:59:44 -0400
- In-reply-to: <004101c1f163$0b7e7de0$0e01a8c0@dev1>
- References: <3CD05721.2F32606D@realns.com>
- Sender: owner-elec-trak cosmos phy tufts edu
On 1 May 2002 at 16:53, SolidTech wrote:
> So, to use this type of controller what happens
> to the field weakening - just not used?
This looks like a Curtis of some type. It's most likely designed for
series golf
car motors.
I've thought about trying one of these on the ET, but hesitated. The
reason is
that series motor controllers count on having a fair bit of inductance in
the
motor (thanks to the series field), and I'm not at all sure that the ET
motors
have enough.
What happens of there's not enough motor inductance? A couple things, I
think (I'm not an engineer, I'm going on a somewhat hazy understanding
here,
so someone should correct any misstatements I make).
First, Curtis controllers seem to start very jerkily when there's not
enough
motor inductance. It's like starting in maybe speed 2. To me, having
smooth
low-speed control is the big advantage of a transistor controller, so if
that's
missing, I'm not very interested.
Second, I think that if the inductance is too low, the current limit
doesn't work
right. This can cause the MOSFETs to commit hari-kari (burn out) if you
overload the motor.
I'd say "proceed with caution," and let us know how it goes.
BTW, if you miss this one, no sweat. I'm pretty sure these guys have been
selling these controllers for quite a while (the name sounds familiar).
You
can also get rebuilt Curtis golf car controllers for a little more,
generally for
around $175-220 or so, from Golf Tech Industries :
http://www.golftechind.com/
David Roden
Akron OH USA