How much power

[drdank]

Hello everyone, this is my first post here. This site has been a wealth of information and has helped me incredibly. I've been lurking for a while but am finally to a point with my CNC project that I need some help.

having finished my frame and xyz axis, I orders some stepper motors and a few kits for drivers. The drivers are:

http://electronickits.com/kit/complete/motor/ck1406.pdf

The motors I am unable to find a spec sheet on. I purchased them from ebay and this is what it says on the label:

600089000B
1.8 DEG/STEP 3.3V 2.0A
NO. 03640
SHINANO KENSHI CO. LTD. JAPAN

I looked on google for that part number and also emailed the shinano company asking for details, but nothing as of yet.

They are bipolar motors (4-wire), and are pretty big (2.25 inches cubed, and about 1.25 lbs each). I can get forward and backward steps using the parallel port of the computer and one of the drivers with a 9v battery, so I think the wiring is correct.

My question is:
How much power will be needed to run all 3 drivers/motors? Should I use one powersupply and split it to all 3 drivers or should I use a seperate powersupply for each driver/motor?

Thanks,
drdank

[johnt]

There is a good tutorial on building power supplies here:
http://campbelldesigns.com/files/pow...ply-part-1.pdf
If the link doesn't work go to campbelldesigns.com and follow the links to building a power supply.
Mr Campbell is extremely helpful.

[Robin Hewitt]

Could be a bit of a mismatch between your drivers and steppers

Looks like the circuit is designed to drive the steppers without current limiting so your power supply should not exceed 6.6V with the coils wired in series and you will need a big heatsink for those power transistors.

The motor in the picture looks like the simpler kind with coils designed to work with 6 or 12 volts, usually kinda slow and very different to the ones you have.

Your motors want the kind of driver that takes big volts then limits the current to what the motors expect. Given that, one 6 Amp supply is a lot cheaper than three 2 Amp supplies unless you can find a bargain