[jcbeck84]

I'm working on building a 3 axis mill and already have 3 stepper motors rated at 3V and 3A per phase. They are 6 wire and can be run unipolar or bipolar. I understand the basic concepts but being a mechanical guy I get a little lost in all the lingo and specifics. I tried reading a few of the threads about situations similar to mine but could only follow them so far. :withstupi So I'm making an appeal for help. I'd just like a simple controller with step and direction controls. I can get the resolution I want with simple half stepping, however I'm worried that might get a little jerky at low speeds. I would like to build it myself since this is a personal project, but will buy a board if it seems reasonable or necessary.

Any recommendations?????

[ger21]

HobbyCNC or Gecko G540

[nhatson.elec]

This is G540 link
http://www.geckodrive.com/product.aspx?c=3&i=14469

and HobbyCNC link, it is flexiable , more option
http://www.hobbycnc.hu/English.htm?C...ntrol=no-cache

[jcbeck84]

I had read somewhere on here about someone saying that if your motor is 3A/phase that you would actually need a 6A controller. Is this a true statement? I only question it because he seemed unsure himself and no one corrected him.

[ger21]

no, not true.

[nhatson.elec]

Have some different RMS current and PREAK current. The driver can wirte RMS current is 3A or Preak current is 3A

If your motor is 3A you need driver can run at 3A RMS or 4.23A( = 3*1.41) in Peark current ( if you use in microstep mode)

Sorry about my english

nhatson.elec

[jcbeck84]

Every controller I look at says its rated for 12 or more volts minimum. If the current output is fine how would I deal with the excess voltage going to the motor?

[nhatson.elec]

They use chopper tech to keep rite motor current

[jcbeck84]

right, the current is ok but the output voltage of the controller is too high for the motor. It wouldn't cause any problems if I just dropped a resistor or some kind of voltage regulator in series with the motor coils to keep the full output voltage from killing the motor?

[nhatson.elec]

If control use chopper tech, you can direct conect , not need drop Resitor

[ger21]

Both the HobbyCNC and Geck handles the higher voltage automatically. Only cheap drives (which you don't want to use) need resistors.

[Crevice Reamer]

Every controller I look at says its rated for 12 or more volts minimum. If the current output is fine how would I deal with the excess voltage going to the motor?

First of all, what comes out of the driver is not steady current but a series of pulses. Higher voltage equals more power from each pulse. Your 3V rated motor can probably handle at least 60 volts of pulsed current.

CR.

[jcbeck84]

Thanks guys for all your help. I think this time I'll go ahead and spend the money on a good drive that's harder for me to mess up and maybe on the next project I'll dig deeper into the electronics.

[kreutz]

........... I would like to build it myself since this is a personal project, but will buy a board if it seems reasonable or necessary.

Any recommendations?????

For a real DIY micro-stepper drive check the following threads: http://www.cnczone.com/forums/showthread.php?t=25361 ,
http://www.cnczone.com/forums/showthread.php?t=38873 and this video:

[ame="http://www.youtube.com/watch?v=U0BDdWLkL8M"]YouTube - Kreutz-4 PC Interface with Mardus-Kreutz Unipolar Micro-Stepper Boards[/ame]

[huongthanh]

Hi all!
I have a 5Phase stepper motor with spec. 2.8A/Phase 2.42V/Phase. Pentagon winding connection. I want to build a driver for above mention motor. Please help