Jeff, David,
Thanks for the responses. The Kelly Controllers look like a good option.
I found the answer on google. The field winding resistance is adequate
to limit the current to an operating level, so just hook up the battery
using an appropriately rated switch.
http://www.4qd.co.uk/faq/bmnc3.html#shwm
Seth
Jeffrey Blamey wrote:
If you don't generate an answer here, you can try one of the EV car
sites. A million years ago they were using the starter/generators (up
to 96 volts I think) in small car conversions with great success...
they were the only game in town. Cheers, Jeff
On Jan 21, 2008 8:44 AM, David Herron <[EMAIL PROTECTED]> wrote:
http://www.kellycontroller.com/mot/Brushed-Motor-Speed_Controller.html
Seth A. Keel wrote:
Hey all,
So I got a cheap shunt wound motor recently. It's a military spec
starter/generator. The guy said the field coils can only take 24v
max, but didn't give me a current limit. The motor supposedly can
handle 96v and a lot of current. 18HP continuous at 72V The
nameplate is missing, so that's about all the info I have and I don't
know how accurate it is.
I have a little PWM controller for motor testing, but how should I
excite the field windings? Just hook up a 12v battery directly?
There is 2.4 ohm resistance, so I'm expecting it will draw 5-6 amps.
I just want to double check before I fry the motor by hooking up the
battery.
Also, what controllers work well for separately excited motors?
Here's the short list of controllers I'm considering:
Sevcon Powerpak SEM (version 3)
http://www.sevcon.com/pages/powerpakSEM.html
Zapi Sem 3
http://www.electrofit-zapi.com/hfcontsepex.htm
Any other suggestions? Thanks,
Seth
