Re: (ET) Lift motor control

[Rob Brockway <getractor yahoo com>]

One thing to watch out for is allowing to much current into a PM motor.  If the starting amps are too high, you can demagnetize the field magnets.  A lot of motors can handle 50% over voltage.  If this was a 12-13.8 volt automotive motor excessive voltage might weaken the field magnets.  If it happens the motor will run faster with less torque.

steves <ssawtelle fcc net> wrote:

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

----- Original Message -----
From: "Dave & Debbie Barden"
To: ; <>
Sent: Tuesday, February 03, 2004 2:32 AM
Subject: Re: (ET) Lift motor control


> could you then run it at say 20 volts get a little more speed out of the
> motor and not harm the motor?
>
> dave
>
> > I think the idea would be to run the controller at no more than 1/2
'power'.
> > If it is a PWM controller then I would think running it at half throttle
> > would provide an average 18V to the motor. I'm getting out of my area of
> > knowledge here, though, so those better informed correct me if I'm
wrong!
> >
> > If this idea is right then one could build a fixed controller that is
50%
> > duty cycle - would be fairly simple.
> >
> > SteveS
> > E20
> >
> > ----- Original Message -----
> > From: "Dave & Debbie Barden"
> > To: ; <>
> > Sent: Tuesday, February 03, 2004 12:58 AM
> > Subject: Re: (ET) Lift motor control
> >
> >
> > > the lift motor is only 18v. I think I've seen warnings about
shortening
> > its
> > > life running it at higher voltage. you might check the archives...
> > >
> > > dave
> > > seattle
> > >
> > > > Hi
> > > > I was wondering if anyone has any thoughts on using this controller
for
> > > > running the lift motor on 36 volts? It is rated for 20 amps at 36
volts
> > > > and only $42.00 each. Go to
> > > > http://www.warehousesensations.net/x360_parts and scroll down to
item #
> > > > X360-220 (AKA) "The Brain".
> > > >
> > > > Ralph Vogan
> > > > ralphgv centurytel net
> > > ralphgv centurytel net
> > >
> > >
> > >
> > >
> > >
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> > >
> > >
> >
> >
> >
> > _______________________________________________
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>
>
>
>
>
>



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