On Tuesday 06 March 2012 13:22:26 charles green wrote: > what are the differences between one phase motors, two phase motors, and > three phase motors?
http://en.wikipedia.org/wiki/Electric_motor One phase: can not start, because there is no torque at 0 speed. Has to be moved by hand in one direction and accelerates then to the nominal speed. Can be started in each rotating direction. Two Phase: usually used with a capacitor to phase shift the current in one of the phases. Runs on one phase systems and starts in the right direction with low torque near speed 0. Three phase: See wikipedia. Asynchronous type: has no permanent magnets, rotates slower compared to the driving frequency (=slip). slip=function of torque. Synchronous type (PMSM): Rotates with the same frequency, but angle between induced magnetic field and permanent magnet is a function of torque. Joachim ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
