RE: (ET) Lift motor control

["Hazen, Dwight L" <hazen indiana edu>]

Variable speed lift control would be great! Also if the controller was
current limited you could not harm the motor. Run the controller on 36
or 24 volts and limit the current. The lift would wind up fast and them
slow down as it encountered the load. Some one should try it. 

 Dwight

Dwight L. Hazen, Indiana University, UITS 
Bloomington, In. 47408-7378
812-855-5367 IP phone 812-856-9229    
hazen indiana edu http://php.ucs.indiana.edu/~hazen/
Ham Radio wb9tlh arrl net http://wb9tlh.ampr.us
"The complexity of your life is directly proportional to how many gas
engines you own - 2 cycles count double."
 

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of steves
Sent: Tuesday, February 03, 2004 11:01 AM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Lift motor control

We just had some discussion on this recently (November, I think).

As I recall, running at higher voltage can work, but with adequate cool
down
time - for example, the tiller load and duty cycle may be too great.
Several
listers run at 24V successfully. Hmmm - Perhaps you could run fast when
taking up slack then throttle down when lifting a load. That would be
nice,
esp when running a double pulley for increased lift capacity.

SteveS
E20