On 25 February 2012 02:55, Jon Elson <el...@pico-systems.com> wrote: >> The effect of this is (I think) that the back-emf is very small, and >> the current very high, for a given torque. >> > HUH? On a permanent magnet motor, the back EMF is determined entirely by > the magnets, and will be the same with or without driving current.
The back-emf in any particular field winding will be independent of the current, but the field windings which are driven by the H-bridge at any one time will be different between a properly commutated bldc with a 90 degree phase shift and one being driven effectively as a low-pole-count infinite-microstepping stepper motor. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
