Re: quadrature endcoder woes?

Hi Aaron

Is it a stepper motor and can you spin it a LOT faster? At 1RPM you
only get 3.3 full steps/sec on a 1.8 degree stepper motor and unless
you use a GOOD driver with a high microstep count you might be seeing
the motor cogging. I have seen that with low cost drives but with a
Compumotor drive/indexer that has 25000 steps/rev it goes away.

Try 500 RPM and it may look like you expect.

Al

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Aaron <aaron.groups@g...> wrote:
>
> I just installed a US Digital encoder (E4P-300-250-T) on a motor. It
> was a royal pain as the centering tool was pretty tight on the motor
> shaft and then the centering tool was quite tight on the PCB when I
> pressed it into place.
>
> With my motor running at a constant 1 rpm, I get the following scope
trace:
> http://www.bright.net/~agarb/quad.jpg
>
> I've never looked at a quadrature encoder pulse stream on a scope
> before. Is it just my imagination, or is this much to noisy?
>
> I have encoder and motor leads separated as much as possible.
>
> Aaron
>