RE: [CAD_CAM_EDM_DRO] DIY brushless controllers?

Thanks for the great tip on the OSMC group.

Kim

On Tue, 2003-12-16 at 12:36, Madhu Annapragada wrote:
> If you want to roll your own I would highly recommend using the PMD MC3310
> chip which takes care of all the commutation, phasing, communication,
> trajectory generation etc (no I don't work for them). We have close to 200
> BLDC drives based on the PMD chipset that I designed out in the field and I
> have not had a single problem with them to date. If you really want to write
> the firmware yourself (a wonderful learning experience ) then consider the
> TI or Motorola DSP chips that have been optimized specifically for brushless
> DC control; Motorola even throws in some code snippets to get you started.
> The OSMC group (check the OSMC yahoo news group) is currently discussing the
> amplifier section of the BLDC drives; the FETs current sensing techniques
> etc. That would be the group to join if you want to be a part of the open
> source design they are pursuing right now.
> Madhu
>
>
> >-----Original Message-----
> >From: bluecoast@... [mailto:bluecoast@...]
> >Hi again,
> >
> >Has anybody taken a crack at homebrewed brushless controllers? I
> >notice Microchip has two interesting appnotes that could be used for
> >this:
> >
> >Brushless DC motor control made easy (speed-torque control)
> >(http://www.microchip.com/1010/suppdoc/appnote/all/an857/index.htm
> >
> >PIC16XXXX/18XXXX DC Servomotor (brushed position control)
> >http://www.microchip.com/1010/suppdoc/appnote/all/an696/index.htm
> >
> >So a position controller would be basically a combination of these
> >two applications... the second addresses optical encoder up/down
> >count; the first the pwm sinusoidal generation to drive the actual
> >brushless motor.
> >
> >Has anybody seen or experimented with these?
> >
> >Microchip also has some other neat app notes about brushed servo
> >control, and one cool sinusoidal microstepping drive.
> >
> >I just wanted to get talking about brushless drives and pitfalls
> >with them since there aren't so many options for us as opposed to
> >brushed/stepper etc.
> >
> >Cheers,
> >Andrew
>
>
> 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@..., timg@...
> Moderator: pentam@... indigo_red@... [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
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/
>
> To unsubscribe from this group, send an email to:
> CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/
--
Kim Lux <lux@...>