Re: STEPPER MTR VOLTAGE SUPPLY HELP!!!

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

>
>
> cnc6805 wrote:
>
> >Hi, I'm retrofitting an old BANDIT 3 axis controller with a PC and
> >master5 software. I've got a 4 axis 10 amp board rated at 50 volts
> >and I'm grappling with a power supply. My steppers(slo-syn) are

rated

> >at 3.6 volts/6 amps (X and Y) 2.9 volts/9 amps(Y). The

manufacturer

> >of the board staunchly opposes the use of a power supply for the
> >motors that exceeds their rating due to the board being a non-

chopper

> >style circuit. They are afraid I will fry the motors with a higher
> >voltage. Although, I checked the voltage supply to the motors with
> >the old BANDIT and it read 10 volts on X and Y and 30 volts on Z.

I

> >did some testing today and pulled an old power supply out of the

old

> >control that powered the front console rated at 3voltsDC at 3

amps. I

> >tried that to just test it out and the motors will hardly move the
> >table. Ive researched this extensively and it seems there are alot

of

> >different opinions on this subject from dont exceed rated voltage

to

> >go at least 20 times the rated voltage. I dont want to go and buy

a

> >power supply thats too small and I dont want to fry anything. Will
> >someone please help me with this.
> >
> >
> Almost all stepper drives since the 1980's are chopper-style of

some sort.

> The L-R type are extremely inefficient, and slow. You may be able

to

> get 10 x faster movement with a chopper-style drive. Thes do

require

> much higher voltage from the power supply.
>
> I would junk the L-R drives, as they will severely limit performance
> and throw off massive amounts of heat.
>
> How do these drives you have regulate the motor current? Is there a
> huge power resistor?
>
> Jon

How they regulate the current I have no idea. They use hexfets? I
dont see a large resistor on the board. This is one board consisting
of 4 motion controllers integrated together. What is L-R type? Can
you expain the differneces between L-R verses chopper style stepper
motor drives? How can one run at higher voltages and not the other?

Thanks for your help