On Mon, Apr 29, 2013, at 02:20 PM, Stephen Dubovsky wrote:
> Also, inverter drive induction motors can do 3:1+ constant hp range. Sure, you can get 3:1 constant power range from an AC motor, but only if you are using a motor that was designed and specified for that application. Typically has a lower base speed than a generic motor of that frame size, speed, and HP. But if you consider the motors that the average hobbyist can actually get their hands on, I think getting 3:1 is a long shot. Generic 1800 RPM AC motors are about 2:1 or maybe a bit more. I wouldn't be surprised if the Monarch 10EE drive-train can do 4:1 constant power. > Eventually the rotor inductance causes the speed^2 term to catch up but it > can be way out there. A DC motor is a mechanically commutated AC machine. > There is nothing performance-wise it can do better than an electrically > commutated AC machine. True, to a degree. But the specific DC motor in the Monarch was designed for a wide constant power range, and I'm sure the AC motor used in late model 10EE's was also designed specifically for the application. You aren't going to get that performance with a vanilla AC motor (or a vanilla DC motor, for that matter). -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
