Re: [CAD_CAM_EDM_DRO] Stepper motor specifications

Lower voltage rating is better, there is less inductance, and the
current rise time in the coil is shorter. Motor power can be
guesstimated using the current. Motor power can also be guesstimated
using the size of the motor. Some people specify a NEMA frame size for
the motor. From what I've read, there is no actual NEMA frame size for
these motors. Nevertheless, a NEMA 23 motor is about 2.3" in diameter.
The motor can be one of three lengths, single stack, double stack,
triple stack, and triple stack with cheese. Each being stronger than
the other. You can deduce the number of "stacks" using the length of
the motor. Don't know them off the top of my head, but compare and you
will see.

The voltage and current ratings are per coil.

Check www.geckodrives.com for more info.

Regards,
JJ

On Wednesday, December 17, 2003, at 05:17 PM, Peter Harrison wrote:

> Hi
>
> I am looking for surplus steppers for my little mill conversion. As I
> am
> sure you have notoced, surplus stepper motors frequently show a voltage
> and current rating on them but nothing else. if you are lucky, you can
> look up the part and discover the torque and such. Frequently that is
> not the case.
>
> The question then is: given just the voltage and current rating, what
> can I deduce? In particular what can I infer about the motor torque?
> Also, do the manufacturers generally mean these are the maximum ratings
> for just one coil?
>
> As an example, I came across a motor rated 1.4V, 3.8A, it has eight
> wires. I would guess this to have relatively low torque and that the
> rating refers to a single coil.
>
> Any thoughts?
>
> Pete
>
>
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