Re: how much motor cogging is OK?

Thanks for all the comments. Not a word was wasted.

The motor I'm looking at is made for electric model airplanes. It is
a three phase brushless motor, 240 W, 28 mm diameter x 38 mm long.
This type of motor has roughly 10X the power of an equivalent sized
DC brushed motor. They are truly amazing. These motors are
available in larger sizes as well, up to at least 1200 W continuous.

They could be used as spindle motors, probably without modification.
Their use as servo motors is questionable, because of the cogging.
The controllers made for them are not at all intended for servo
applications. Some (but not all?) of them are not reversible. Since
the controllers are meant to be used with radio control receivers,
they are pulse width controlled.

The motivation for this would be to greatly reduced the motor mass,
thus the moving mass, of a small CNC machine, and to see where that
leads. Perhaps larger acceleration with less deflection.

regards-
Elliot

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Apalais" <apalais@...> wrote:
>
> Hi Guys,
>
> I'm just going to but in here and ask if this is possible with at
stepper motor. I don't know if you have seen my threads about my
problem that I'm having with my steppers system. But this sounds an
awful lot like what I was having. I have 1200ozin steppers that are
geared about 2.57:1. When moving my machine slow, you can feel all
the steps in the motor because it is only turning very slow. Is this
the same kind of thing that you are talking about here?
>
> And if I have these vibrations, this can make me loose steps/
position? Yes???
>
> Peter
> Australia
>
>
>
> [Non-text portions of this message have been removed]
>