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Author Topic: Servo system  (Read 5813 times)

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Offline comet

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Re: Servo system
« Reply #10 on: February 09, 2008, 03:58:24 PM »
swarfboy,
  your question is a bit of a "how bigs a hole" one. but I would say that you would be looking at 120 watt motors
running at 2-4000 rpm geared to give you a maximum of 3-4000 mm per minute a 250 cpr encoder would be about right
with a g320. and thats with a good pentium running up to 45khtz.
   gecko's wont run brushless motors,you are looking at mega bucks for a brushless system.
remember you can fix encoders on to practicaly any dc pm motor to make a servo as long as they have a minimum of 12
poles they will run ok without cogging, I have modified a lot of "standard" motors successfully so I know it works.
In short you can build a servo system for really not much more than steppers.
  I think you will struggle to build a brushless system without digging very deep into your pockets!

Offline Graham Waterworth

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Re: Servo system
« Reply #11 on: February 09, 2008, 04:04:39 PM »
I run servos on a Boxford lathe and the accel is 600 and velocity is 4850mm/min no loss of steps, the motors are nema 23 size.

0.22 Nm Stall Torque
1.7 Nm Peak Torque
3.1 Amps

They work on a 10 Amp linear 48 volt supply using 500 ppr encoders, the accuracy is .01mm/300mm all day long.

Graham.
Without engineers the world stops
Re: Servo system
« Reply #12 on: February 09, 2008, 05:14:46 PM »
Graham,

  What controller hardware and motors are you using? Sounds like what I'm looking for. Cost?

Brian

Offline Graham Waterworth

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Without engineers the world stops
Re: Servo system
« Reply #14 on: February 14, 2008, 12:29:43 PM »
Hy Graham,
some little question about servo drivers from motioncontrol I read somewhere that I need to calibrate drivers to work with there servo motors and I don`t have oscilloscope did you have to do it your self? or it works straight from the box with no problem.
Do you need encoder on the motor or driver can work without them at all.

Thanks for giving info about motor size nema 23 there was very Little info about them.


Regards for Croatia.