Stepper Motor Giveaway

[rmteo]

They are bi-polar. Only the 4 inner connections are used - the outermost 2 are NC. See post #1 for a link to the data sheet.

[cncmachineguy]

thanks RMTEO, I had read the datasheet, then I confused myself when they had the 6 pin connector. BTW, do you have a favorite drive or chip (btw, I am not scared of the SMT's anymore)?

[rmteo]

This is what I would use http://www.allegromicro.com/en/Produ...3987/index.asp

[Heckler]

Sparkfun has this same chip on a nice little driver board... http://www.sparkfun.com/products/10267

[cncmachineguy]

Just a little confused. Here is the datasheet for the driver linked by RMTEO. I read it as having 1.5A output. Now I assume this is per coil. Am I wrong - again? The sparkfun board says .75A, so if I am correct, why half?

I am also baffeled by the motor supply current. 4mA max? this is on page 4, Ibb rating. Thats a pretty high gain by my book!

Edit: I see the SF unit is not the exact chip - that makes sense now. Still confused about the motor supply current

[Heckler]

Sorry Bert,

I should have looked closer at the part numbers...

I had just seen that little board on Sparkfun and remembered that it had an Allegro chip on it.

I can't give you any more insight on driving stepper motors. But I can give you another link . Here is a board that has been recomended to me for doing various CNC stuff... It is a 3 channel kit... http://www.hobbycnc.com/products/hob...ver-board-kit/ they also offer a slightly more expensive one that apparently has idle current reduction.

Again, I am a bit out of my league here, but have been doing a lot of reading and studying trying to decide how I am going to drive the motors that (hopefully) rmteo will be sending me soon. There are also tons of boards on ebay... search "stepper driver" but as usual, beware.

There is also a great, huge, group forum called cnczone.com, but goodluck navigating down through all the forums.

Sorry to have mislead you.

[cncmachineguy]

No problem Dwight. I will prolly build my own boards based on the driver reccommend by RMTEO. The easyCNC board you linked is for uni-polar only!! Will not work with these motors. But I do appreciate you sharing what you have found. I need to order some boards for another project, I think I can piggy back some for this on the same panels