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Offline dude1

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power supply
« on: September 04, 2013, 10:02:27 PM »
what  size power supply should i have to run two stepper motors run on 213v,

Brand New NEMA34 Hybid Stepper Motor 85BYGH450B-06D
these stepper motors
Step Agle - 1.8+/-5%
Insultion Resistant - 500V DC 100MΩ Min
Insultion Strength - 50Hz 1Minute 500V Min
Ambient Temperature - -20~+50 degree
Temperature Rise - 80 Max.
Radial Play - 0.02mm Max.
End Play - 0.1-0.3mm
Step angle: 1.8
Current: 5A
Resistance: 2.9Ω
Inductance: 12mH
Motor length: 113mm
Shaft Size: 14mm
Holding Torque: 6.3 N.M
Weight: 2.8Kg
Lead Wire(No. ): 4
Re: power supply
« Reply #1 on: September 04, 2013, 10:20:23 PM »
Those motors will require unreasonably high DC voltage (about 110VDC), and will have terrible high-speed performance, due to their VERY high inductance.  They're a poor choice for any CNC machine.

Regards,
Ray L.
Regards,
Ray L.

Offline dude1

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Re: power supply
« Reply #2 on: September 05, 2013, 05:10:20 PM »
thanks ray thats what i was thinking.
i dont know a lot about steppers would haveing these steppers be better, as the z axis is around 60kg, the x axis is about 100kg and y,b axis on my gantry is about 300kg.
http://www.automationtechnologiesinc.com/products-page/nema-34/nema-34-high-torque-stepper-motor-1200-oz-in-half-inc-single-shaft-with-flat. or this one
http://www.automationtechnologiesinc.com/products-page/nema-34/nema34-stepper-motor-%E2%80%93-906-oz-in-6-1-amp-single-shaft-kl34h295-43-8a
Re: power supply
« Reply #3 on: September 05, 2013, 08:05:22 PM »
I would agree with Ray about the high inductance.  Also since your gantry has about 3 times the mass of mine I'd go with the 1200 oz./in steppers not the the 906.  Even then, that is a lot of mass to be moving around, don't expect stellar performance.

Offline dude1

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Re: power supply
« Reply #4 on: September 05, 2013, 08:20:27 PM »
its only gess work about the weight of the gantry but its cast iron it will be between 200-300kg
Re: power supply
« Reply #5 on: September 05, 2013, 10:47:05 PM »
its only gess work about the weight of the gantry but its cast iron it will be between 200-300kg

ANY stepper motor will give disappointing performance on something that heavy.  You should be looking at AC servos, and unless you want to waste a WHOLE lot of time and money you better learn how to calculate the correct motor performance to get the machine performance you expect.  Building something that size based on guesswork is pretty much guaranteed to have a very bad result.  There is no substitute for measurement, modeling, and calculation.

Regards,
Ray L.
Regards,
Ray L.

Offline dude1

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Re: power supply
« Reply #6 on: September 06, 2013, 06:19:06 PM »
its a 1200mm x 2400mm chines machine the cross member for the gantry is cast iron it looks like a lathe bed. what would you recomend to drive it the othe axis are fine it just the weight for the gantry that is a big problem.
max speed of machine as it is now is 800mm/min just.