Kirk Wallace wrote: > On Mon, 2007-08-13 at 21:27 -0500, Jon Elson wrote: > >>The Pac Sci is too high voltage. > > > Is the amp voltage limited by the output component ratings? > Yes, I have 200 V FETs in there, as well as a number of other parts at either 200 or 250 V rating. So, all of those would have to be raised for operation above 150-160 V DC. > >>The Sanyo >>sounds a lot better, but research shows it is a >>sinusoidal-commutation motor, so it won't run well on my >>brushless amp! Darn! >> >>Jon > > > I am guessing that what makes a motor a certain type (sinusoidal vs. > trapezoidal) is the physical layout of the windings and magnets? Yes. A sinusoidal-commutation motor has the phase windings overlapping just like a 3-phase AC motor. A trapezoidal-commutation motor has them not overlap, but end abruptly. Or, at least, that is what I think the difference is. I don't think the magnets are different. If you use the wrong drive scheme the motor will vibrate quite a bit. With trapezoidal-comm. the servo amp only needs the 3 commutation signals to know which coils to drive. With sinusoidal-comm. the drive needs absolute position info, so it has to read the encoder signals, and know how many encoder counts equals how many electrical degrees through the sine wave. So, there is a programming step involved to set the amp up to correspond to the motor/encoder combo. I really wanted to avoid that.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
