Drive board for my stepper motors

[amo]

I am not any good on elektronics and therefor I need help in chosing the right electronics.
I have three stepper motors,
two are
150 oz, 1.7v, 4.7A, 1.8 deg, DC hz, 65deg C. rise
and the last stepper is
300 oz, 2.5v, 4.6A, 1.8 deg, DC hz, 65deg C. rise

If something is unclear or missing I have pictures can e-mail them, since I don`t know how to lay them out here.

So I need a drive board and the rest of the elektronics to operate my cnc mill.

[nh_eng]

Have you already purchased these motors, or have you just selected them. The high current requirements of these motors are going to force you to buy a more expensive driver board than would otherwise be required. The primary characteristic of a motor which determines the driver needed is the current requirement. Many of the lower cost (although quite capable) drivers can deliver a max of 2.5A. You have to step up to a 5.0A more expensive driver for the motors you have selected. There are motors with 150-300 oz-in that run at around 2.5A

If indeed you already have these motors, then I would suggest you look at the Geckodrive G201 board. It can drive up to 7Amps, and a bit over $100US per axis. As far as the power supply, I depends on how many of the motors will operate as the same time. If all three motors can run at once I would recommend a supply capable of delivering about 6-8A, with an output voltage of 60-70 volts if you need to run at high speed. To keep costs down you could go with a 36 volts supply, but it will not be able to drive the motors at as high a speed as the higher voltage supply could.

www.kelinginc.net has a kl-7212 power supply for about $150US which can put out 12A at 72 volts. That, along with the Gecko drives will provide MAXIMUM performance from your motors.

Good Luck.

[kreutz]

I am not any good on elektronics and therefor I need help in chosing the right electronics.
I have three stepper motors,
two are
150 oz, 1.7v, 4.7A, 1.8 deg, DC hz, 65deg C. rise
and the last stepper is
300 oz, 2.5v, 4.6A, 1.8 deg, DC hz, 65deg C. rise

Before buying any controller you have to determine if your motors are unipolars or bipolars.

4 wire out of the motor => bipolar
8 wire out of the motor => unipolar or bipolar (your choice)
6 wires out of the motor => unipolar or bipolar series.
5 wires out of the motor => unipolar (or five phases, depending on the Resistance readings)

Bipolars are candidate for Gecko drives.
Unipolar motors => use unipolar drives (there are so many flavors of DIY on the web).
5 phases motors need a special 5 phase drive.

Note: Since your motors are 1.8 degrees per step I don't think they are 5 phases.

[amo]

I have two Terco 4441 mills(small mills) and they have the stepper motors I am talking about. The mills are about 20 years old and therefor the electonics sucks, but the base are good and so are the stepper motors I think.

I counted 7 wires but one was not in use and it looks like another was earth.

My plan were to use litle money on the electronics, dont need full power.

[SORCHEROR]

amo,
cheapest drives you can get right now is on ebay,the place is called
hubbard cnc components,they have 7 left,i bought some awhile ago and they seem ok,they can put out 5 amps per phase and up to 30 volt supply,for your motor i would buy 24 volts supply,the drivers are $32 each,supply will run you about $25,you might need two supplies though,most 24 volts supp.are only 5 amps,try to find a 10 or 15 amp so you only need one,good luck,have fun
steve

[SORCHEROR]

your motors are unipolar 6 wire im sure,so can use them on either,bi or uni drivers,you will have to determine whcih way to wire them up,half or full winding,im not positive,maybe someone here knows more,but half winding will yeild you better power results,but ask some one here to be sure

[alexccmeister]

Hi,

Hope I am not hijacking this thread. But I have a similar question. I have a 24V 6.3A power supply and I will be powering 3 Keling 5056 drivers. Am I correct to say that I can actually use 3 of this power supply to run each axis driver?

for your motor i would buy 24 volts supply,the drivers are $32 each,supply will run you about $25,you might need two supplies though,most 24 volts supp.are only 5 amps,try to find a 10 or 15 amp so you only need one,good luck,have fun
steve

Any reason why you would go for a 24V as oppose to a higher voltage?

Thanks

[SORCHEROR]

alex,when i suggested 24 volts it was for amo who wanted to go as cheap as possible on his setup,i suggested drivers that max out at 30 volts,but suggested 24 volts,30 volts supplies are the max and might spike over that so safer at 24,i agree with your thinking,i use geckos myself and 54 volts supply,to answer your question ,yes ,you can run three supplies,one for each driver,but your supply is 6.3 amps,what size motors you have?one suplly would be enough if your motors are around 2.5-3 amps,since all three motors wouldnt peak at the same time,your not gaining anything with more supplies,only increase in volts will give you better top speed

[SORCHEROR]

alex, with the keiling 5056 driver you can go 50 volts,i recommend a 48 volt supply,you will gain alot of top speed,depends on the motors,what size motors? 250 to 280 oz/in motors work ok on 24 volts,they have good top speed being small,but the 400 and up will have poor top speed on 24 volts,but more low speed torgue,as the motor gets bigger they loose top speed unless you increase volts,just something to think on,i had the new kieling 497 with 24 volts and that week i switched drivers and supply,went to 48 volts with geckos 201,i would have saved money using the 5056 keilings but they were out of stock and im always in a hurry

[alexccmeister]

Hi Sor,

I am using 497oz.in motors on all axis. I am currently using a measly 24V supply at 6.3A. I think the current is 3A per motor. I would like to have top speed torgue as well as low speed torgue. I guess I have satisfied the latter requirement. Now just need to get a 48V supply. Is it ok to go with higher amperage? Say 10A supply instead of 6.3A.

By the way, just looking at the 5056 spec, is the current out put of 5.6A from the driver to power the motor? How would three drivers output 5.6A each if the current supply is only 6.3A. Sorry I have no electronic background so not much idea about current and voltage.

[Madclicker]

5 wires out of the motor => unipolar (or five phases, depending on the Resistance readings)

Can you elaborate on how to identify 5 phase motors?

[kreutz]

Can you elaborate on how to identify 5 phase motors?

On a 5 phase motor you could have 5, 6 or 10 wires.

If you have 5 wires resistance readings will be the same between consecutive phases as they are connected in "delta" (as in a Pentagon).

If you have 6 wires you have a star connection, so you will find a common wire and the other 5 will have the same resistance reading using the common as reference.

If you have 10 leads, then there are 5 equal resistance pairs, and you can connect them in "star" or "delta" configuration.

Note that I call the connection "delta" using the 3 phase analogy, but it could be better called "penta".