Re: how much motor cogging is OK?

Jim,
E-Flite is sold by Horizon Hobby.

http://www.horizonhobby.com

The E-Flite manufacturer site is:

http://www.e-fliterc.com/Default.aspx

HiMax motors are made by Maxx Products International:

http://www.maxxprod.com

There is a 2500 W maximum(3.3 hp) motor from E-flite (Power 160
), which would be enough for a decent sized spindle. It weights 650
g, so one could imagine an electric vehicle with that!

The motor controllers turn DC into the three phase needed for the
motors. Maybe that just means these things are steppers with small
number of steps? They have large permanent magnets in them, not like
the usual AC 3-phase motors. Some must be reversible, since for a
type of stunt flying "3-D" they fly backwards.

regards-
Elliot

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jim Fleig - CNC
Services" <jim@...> wrote:

>
> Where can these motors be obtained? Any links?
>
> Jim
>
> ----- Original Message -----
> From: optics22000
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Sent: Saturday, September 30, 2006 11:30 AM
> Subject: [CAD_CAM_EDM_DRO] 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]
> >
>
>
>
>
>
> [Non-text portions of this message have been removed]
>