Re: Stepper motor driver -- schematic help...

On 3月29日, 上午6时49分, Adman <aspr...@xxxxxxxxx> wrote:
Hi all... I'm a software guy trying to learn the ropes of electronics.

I have the goal of controlling a stepper motor using my PC parallel
port to create +5v control signals. Shouldn't be that hard, right?

My understanding of 5-wire stepper motors is that there will be one
common power wire, and four other wires coming out. Attach the power
wire to the power source, and attach the other wires to ground (using
some logic to connect the right ones to ground at the right time), and
you're all set.

I bought a unipolar stepper motor... the first one listed on this
page:

http://www.futurlec.com/StepperMotors.shtml

One thing I noticed is that the spec *** lists that it has a "drive
circuit".

Some more investigation led me here:

http://www.eminebea.com/content/html/en/engineering/motors/pm_motor/s...

Since I bought a unipolar stepper, I think the first schematic on the
page applies. I'm not quite sure how to read it. It appears that
what I want to do is attach my parallel port data pins DIRECTLY to the
bases of each of the transistors (which is what the four non-power
wires coming out of the motor will be).

If that's the case, it looks like I use my parallel port control
signals to activate each transistor according to activate the internal
electromagnets in the proper order. Being a smart software guy, I can
handle that. When I do that, the power will go through the coils,
through the transistors, and into the little black boxes.

What are those little black boxes? Some sort of internal ground?

Sorry for the newbish questions, but every description of a unipolar
stepper motor seems to imply that I need to build or buy my own drive
circuitry. So the idea that this one might come with its own already
built right in is throwing me for a loop.

If someone could confirm my suspicions, or point me in the right
direction, I'd appreciate it.

Also, I don't actually have the motor in my hand yet. It's being
shipped. I'm just trying to get things figured out before it gets
here. :)

Thanks!
Adman



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