Re: [CAD_CAM_EDM_DRO] Motor and power size?

Jon Elson kirjoitti 13.11.2003 kello 08:36:

>
>
> ezko.laurila@... wrote:
>
> >Hi all.
> >
> >I have 4 CMC MH2620-127E PM Field servo motors 91w, and 4 Gecko 320
> drivers. I plan to build borrow or steel a medium size machine.
> >
> >My questions are,
> > 1. Are these motors to small?
> >
> Too small for what? A mini-mill? Probably OK. A Bridgeport? I really
> think you will have problems.

This would be a nice size but?
http://www.warco.co.uk/millers/vse.htm

This would be a more realistic size or?
http://www.warco.co.uk/millers/GHUniversal.htm

>
> > 2. Should I use 1:3 or 1:2 reductions or none?
> >
> It depends on the leadscrews. For a Sherline, with 20 TPI screws,
> you don't
> need much reduction. For a Bridgeport with 5 TPI screws, you almost
> certainly
> do.

I have planed to use a leadscrew with 5.08mm pitch (5TPI), with a 500 ppr encoder (x4 = 2000/rev). Would it bee a better choice to use a 2.54mm pitch (10TPI) or even 1.27mm pitch (20TPI)? The accuracy would bee a overkill for the 1.27mm pitch leadscrew, but I do already have the encoders, so we do have to live with it.

>
> > 3. What power supply do you think would be the right size?  36v 2,5Amp.
> >
> >
> What voltage and current rating are these motors? Is 91 W the
> continuous or
> peak rating of the motors? What is the no-load speed of these motors
> at
> 36 V?

My Torqemaster 2620-127E servo motor spec’s:
Cont torque 52 oz-in
Peak torque 300 oz-in
Cogging torque 0.7 oz-in
Torque sense 23 oz-in/Amp
Back E.M.F 17 Volts/KRPM

I do not know about the 91 watts, is it continuous or not, but I bet it is cont.
Please correct if wrong!
If I feed the motor 36v it revs at 2100 (no load!) and it takes 2.5 Amps with max load.

Ese

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