Re: [CAD_CAM_EDM_DRO] Unipolar/Bipolar Parallel/Series?!?!?

Howdy Jan~!

From: <JanRwl@...>

>
> You kinda "got it". An 8-wire motor can be "strung" to be a four- OR
> six-wire (bipolar or unipolar). Remember: If you "parallel" the

windings,

> so that you have the equiv. of just-TWO windings (four wires), the total
> current (that's "amps") draw will be TWICE what it is for each single coil
> (or, if you had 'em series-strung as a "six-wire" motor). So, the

lead-wires

> will have to be appropriate. That is, you don't wanna be using #22

stranded

> to conduct ten amperes for 17 feet!

Heyyyyyyy...I think I'm finally starting to get this stuff...
So, I *don't* have a four phase bipolar motor.
I have a two phase motor that can be configured as either
a heavy duty bipolar one, or as a versatile unipolar one.
Izzat correct?

So figuring this is correct, and given the ratings of my motors (3.5A
uni/5.0A bi),
The 3.5A rating is for using them series wired and the 5.0A rating
is using them parallel wired. Is that correct?

> Capacitor? OK, with steppers and solid-state switchery such as ol'

Marliss

> has crammed into that tiny Gecko box, when things "change state" (from ON

to

> OFF, or ZERO to ONE), the "sudden current draw" is kinda like the force

the

> nail "sees" when the hammer hits its head. If you put more than 12" of

wire

> between the power-source and the Gecko's terminals, that wire, being a
> resistance, though relatively small in numbers of ohms, is kinda like

putting

> a pinch of sponge-rubber between the hammer and the nail-head. The

capacitor

> "right AT the Gecko's terminals is kinda like filling that sponge with

hard

> epoxy, so the hammer's force will have more or less the same effect on the
> nail, before the sponge and epoxy do what the WTC buildings did. Only,

the

> capacitor remains ready to do it again and again, with no dust! BAD

analogy,

> but, well, I are ignernt! Some might call this a "bypass" capacitor;

others,

> a "DC Filter-capacitor AT the load". Others, "good sense!". I opt for
> all-three, particularly the last!

This is a great analogy, thanks.

> If your power-supply is not very good — say, poorly filtered (too small a
> capacitor of its own), or unregulated, with an "open-circuit voltage" only

a

> volt or two above what you "want", then there is more reason than ever,

12"

> of wire or even less!, for the 470 uF capacitor! (I just hadda go

shopping,

> and got some TINY 2200 uF caps that'd fit between the + and -

input-terminals

> of the 210 just fine (oh, but only 25 volt! I'd want more, say, double

the

> "want" voltage!). 25 is too close to 24, if that's what you would have,

even

> if regulated, in my opinion.

So this kinda answers one of my other questions.
I could go ahead and put a cap in place just to be safer anyway.

> If you have specific questions like this, feel free to e-mail me direct.

I

> am "into" steppers, lately, having built four CNC lathes, and PCB drills

and

> plotters and such, in recent years. I am not a "degreed engineer", but

some

> say "he be de greedy engine, hear?!"
>
> Jan Rowland, Troll

Thanks Jan, I appreciate it.

Weyland