> > So basically, > BLDC = DC on coils, Hall sensors > PMAC = AC on coils, Absolute sensors > PWM used to produce and control DC or AC > > Corrections welcomed.
I'd amend that to say BLDC are just that, run from unmodulated DC like the fans in your computer (no PWM just field coils switched by the Hall devices) BLDC really applies more to the drive method the the motor (a "BLDC" fan motor will run just fine with sine wave drive) All the motors here are really AC synchronous motors (but with PM rotor exitation) Many AC servo motors have incremental encoders _and_ Hall effect devices (or Hall signals from the encoder) This allows an incremental encoder to act like an absolute encoder with +- 30 degrees startup uncertainty which is OK to get the motor running. This uncertainty goes away once a Hall edge occurs. > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > ------------------------------------------------------------------------------ > 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. ------------------------------------------------------------------------------ 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
