On Wed, 10 Nov 2010, Brian wrote: > Date: Wed, 10 Nov 2010 00:00:29 -0500 > From: Brian <turbo94must...@gmail.com> > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > To: EMC developers <emc-developers@lists.sourceforge.net> > Subject: Re: [Emc-developers] BLDC Driver > > BLDC and AC servos are not the same. The difference is subtle, and > they could be interchanged for one another, but would not result in > optimal operation. the difference is the shape of the back EMF > voltage they generate. The AC motor will tend to generate a more sine > like EMF, and the DC motor will tend to generate a more square, or > trapezoid like shape.
Actually theres very little difference. All the PMSMs I've seen generate somewhat flat topped sine wave BEMFs, this include 2 phase CPU fans (BLDC), AC servos, washing machine motors etc. For example the Parker motors we are using for 8I20 testing are specified for either trapezoidal drive or sinusoidal, they dont care... > > This guy from MIT has a lot of good info he has written on the subject > http://scolton.blogspot.com/ > > Specifically this paper here. > http://web.mit.edu/scolton/www/3phduo.pdf > Simulated waveforms... Ha Ha > Brian > > > On Tue, Nov 9, 2010 at 1:16 PM, Andy Pugh <a...@andypugh.fsnet.co.uk> wrote: >> On 9 November 2010 17:25, Brian <turbo94must...@gmail.com> wrote: >>> >>> If you use PWM, doesn't that make it an AC motor? >> >> It's fuzzy. BLDC motors are also known as AC servo motors. >> To further muddy the waters, one potential use of the generalised BLDC >> component would be old-school VFD or new-fangled flux-vector drive of >> induction motors (if they have encoders). >> >> -- >> atp >> >> ------------------------------------------------------------------------------ >> The Next 800 Companies to Lead America's Growth: New Video Whitepaper >> David G. Thomson, author of the best-selling book "Blueprint to a >> Billion" shares his insights and actions to help propel your >> business during the next growth cycle. Listen Now! >> http://p.sf.net/sfu/SAP-dev2dev >> _______________________________________________ >> Emc-developers mailing list >> Emc-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-developers >> > > ------------------------------------------------------------------------------ > The Next 800 Companies to Lead America's Growth: New Video Whitepaper > David G. Thomson, author of the best-selling book "Blueprint to a > Billion" shares his insights and actions to help propel your > business during the next growth cycle. Listen Now! > http://p.sf.net/sfu/SAP-dev2dev > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
