On 24 January 2011 17:22, Jon Elson <el...@pico-systems.com> wrote: > Also, a good brushless servo motor has minimal torque or velocity > ripple, even down to > extremely slow speeds. Certainly, a car alternator is not optimized for > smoothness at > low speeds.
Putting on my work hat, I think that they probably are optimised for smoothness, as any cogging torque is likely to excite the FEAD belt and create troublesome noises. Whether this translates to smooth output torque is something I am less clear on. I seem to recall that they use a skewed rotor. It shouldn't be too hard to add hall sensors to one of these, or even to fit an encoder and drive it sinusoidally. Time to raid the scrap bin at work :-) -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
