Re: [CAD_CAM_EDM_DRO] Re: Driving unmarked steppers

Here is one of Mariss' "mystery motor" papers.

Alan KM6VV

mariss92705 wrote:

>
> Hi,
>
> Here's what I use for "mystery motors":
>
> size 23, 1 stack -- 5W
> size 23, 2 stack -- 8W
> size 23, 3 stack -- 10W
>
> size 34, 1 stack -- 8W
> size 34, 2 stack -- 12W
> size 34, 3 stack -- 14W
>
> This applies to 6-wire round motors. It does not apply to the
> new "square" motors, but being new, they probably are not mystery
> motors either.
>
> When you measure the resistance, be sure to short the ohmmeter leads
> together first. Subtract the lead resistance resistance reading from
> whatever you read for the winding resistance.
>
> To improve accuracy a little more, measure the resistance of the end
> wires of the winding, subtract the lead resistance, then divide the
> result by 2 to get the center-tap to end-wire (unipolar) resistance
> of the motor.
>
> Mariss