Hi Jon, I've have a Panasonic MUMS0442A1A 400 W that has an encoder on the back. Also something on the order of a Getty Brushless that I know nothing about and an SEM that IIRC is a 115E seres that I believe has hall devices on it. The last two are buried down in the shop but I can get better numbers tomorrow.
Dave On Aug 13, 2007, at 9:13 PM, Jon Elson wrote: > 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 ------------------------------------------------------------------------- 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
