Re: Brushless motors from models and such

Thanks Hugh,

It application would be for a high speed spindle.

seems the current unit of choice is a dremel or similar.

there is a desire to get away from brushed motors for the maintenance
problem, even if the brushless is less powerful.

I am still not sure about the ESC (electronic speed control) it seems
that there is a radio receiver in the model and that will output
something to the (throttle) motor.

For servo's like flaps or alerions or even steering, the servo is a
motor with gear box that moves about 90 degrees. it receives a steady
1,500 hz signal to remain at center, or 1,000 hz to move fully one
way, or 2,000 hz to move fully the other way, or anything inbetween.

What I have not been able to find is what siganl would be needed for
the throttle.

I do understand the motor needs 7 to 12 volts for POWER, but the
SIGNAL is something different.

the 15-20mS instruction time makes sense, with a 1-2mS command,
possibly 20mS for full speed ? I would expect a 'not zero' signal to
indicate zero speed.

industrially, we use 4-20mA and have 4 to show we are connected, but
have a zero value. a real zero means the wire is cut or there is no
power.

From the looks of things, the motor run in the $80 range and a 20 amp
or more ESC runs close to $100.00

It sounds a little pricey for a 35,000 RPM motor, but it appears there
are not a lot of options for high speed motors.

Dave



Dave





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Hugh Prescott" <hugh345@a...>
wrote:

> I think the OP is looking to use a propulsion motor for a spindle drive.
>
> The hobby industry is presently experiencing rapid growth in

brushless DC

> motors and controlers.
>
> Basically they are a VFD and 3phase motor. DC input 7.2 to ??? volts

input

> and require a 15 - 20 MS repeating 1 - 2 MS positive pulse from the

radio

> system throttle channel.
>
> No reason they would not make a good spindle drive motor for a small
> drilling or milling system as in PCB work.
>
> As far as using the motor and speed controller for positioning I

think not.

> No feedback capability and way to course control.
>
> Hugh
> Hobby shop owner/ hobby electronics electroinc tech.
> Always willing to answer questions
>
>
> ----- Original Message -----
> From: <r@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Saturday, September 03, 2005 5:10 PM
> Subject: RE: [CAD_CAM_EDM_DRO] Brushless motors from models and such
>
>
> > Try googling for "hacking servos". It's a fairly popular activity for
> > the robotics folks to remove the travel stops on RC servos and use

them

> > as motors.
> >
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
> > Sent: Saturday, September 03, 2005 12:29 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Brushless motors from models and such
> >
> > Hi all,
> >
> > I have been trying to find information on these small hobby motors and
> > have come up pretty empty.
> >
> > It seems there is not listing or charts that show what sizes are
> > available, surprizing that I didn't find manufacturers with such data.
> >
> > Also, I have not found the electronical link between the

controllers and

> > the R/C receiver. One guy at tech suppport said he thought it was
> > 0-5 volts, but was not sure.
> >
> > Does anyone know of any hobby lists or other sources of

information were

> > the guys would actually know how the parts work ? it seems the whole
> > hobby is orienteated towards using the toys and not engineering them.
> > (just opposite of this list)
> >
> > Dave
> >
> >
> >
> >
> >
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@a...,
> > timg@k...
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> > [Moderators] URL to this group:
> > http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> > aol://5863:126/rec.crafts.metalworking or go thru Google.com to

reach it

> > if you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this to

be a

> > sister site to the CCED group, as many of the same members are there,
> > for OT subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING

THEM.

> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> > bill
> > List Mom
> > List Owner
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@a...,
> timg@k...
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> [Moderators]
> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to

reach it if

> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this to

be a

> sister site to the CCED group, as many of the same members are

there, for OT

> subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING

THEM.

> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> > bill
> > List Mom
> > List Owner
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >