Re: [CAD_CAM_EDM_DRO] servo motor

afogassa wrote:

>Hi All,
> Regular dc motors have straight iron core, while all the servo
>motors I've (maybe not enough) have the iron core plaates set at an
>agle, I think the reason for that is to help on the iron core
>transition when coming in/out of the magnetic field right? thus
>making positionig smoother than a regular dc motor with straight iron
>core plates.
> I'm wondering if a regular dc motor can be smooth as a servo motor.
>
>

High-end DC motors designed for quiet operation at low speeds also
are made like that. Many servo motors fix the reluctance problem
with careful shaping of the poles and slots, without using skewed
windings. But, a properly skewed winding is another way to solve
the problem.

Certainly, I've seen some ordinary DC motors of good quality design
that have worked very well as servo motors. But, I also have run
across some DC motors that clearly would have made poor servo
motors. Some of them had magnetic cogging that was awful, others
had torque or velocity ripple that was quite easily detected with a
battery and my hand.

Jon