RE: [CAD_CAM_EDM_DRO] Re: 187 oz-in steppers for 34.95?

> Can I ask what you use for a power supply and controller? I haven't
> bought them yet and would like your input since you run the same
> motors I'll be running.
>
> Thanks,
> Kevin

Kevin,

I use a lab type regulated power supply for startup and test phase. I
determine the "best" current limit, voltage, etc. and build my own permanent
power supply that goes into the box. Assuming that this will be your first
project and you have probably not decided which driver to use, I suggest
that you also buy a regulated power supply similar to the one below:
http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Prod
uct_Code=A4-222
It will bring some additional cost but you may be able to play with it until
you find out exact power requirement for your system. Then you may build/buy
a permanent power supply and save your lab equipment to start a new project.
I want to point out that each project may have different power requirements
even when using same motors. You may wish to have more speed rather than
torque and connect motor windings in parallel, or one motor in parallel and
the other ones in serial.

People would suggest that supply voltage should be between 4 times and 25
times of the coil voltage. Quite a range isn't it? Since there are many
factors which would affect power requirement I find it very convenient to do
it as above.

Alternatively, you may buy drivers and try to match a power supply to them.
Actually, you will feed the drivers, not the motors, so it is important how
your drivers handle current, etc.

I use PIC based drivers (for unipolar motors) I wouldn't suggest them to you
for your first project, and computers for the controllers. You may wish to
use a bipolar driver (such as Gecko 201 or 210) as these have adjustable
current setings and do not require regulated power.

Greetings

Memo

PS: Would you please provide some feedback when you get the PK268M-02A
motors? Considering their price, I suspect that they might be industrial OEM
overstock and may have weird shaft ends or all cables are same color, etc!






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