On 01/23/2011 02:14 PM, [email protected] wrote: > Yes on the surface this looks like an esc project. However the fact > > that it has multiple interfaces supported such as CAN, i2c, pwm and > > serialmean that it can certainly send and receive the sort of data you > > are looking for. > > > > I am well aware that an esc is different than a cnc driver, however > > Piotr is a control engineer thus the commutation routines that he is > > developing are the latest and greatest in all respects. I have already > > discussed the idea of using it for cnc and he is certainly happy to > > help. The nice thing about Piotr is that he is not an amateur coder, > > thus adding pid loops around his various routines will not be an > > exercise in trying to unravel a ball of wool. > > If he can write code to use a shaft encoder to feedback position, and use that information (adjusted for 1000, 2000, 4000, or whatever counts per revolution) to fudge the equivalent of a hall effect sensor feedback, then YES, this would make a good BLDC controller for CNC.
The next link shows a 6500 watt BLDC motor for around $99. That's around an eight horsepower motor for around $100 bucks. .130Kv times 50 Volts gives 6500 RPM at 50V no load. I don't think you could build one for near that, though I've thought about that option. For bigger stuff you might try the armature from a vacuum cleaner motor. I've never tried taking one apart, but they are supposed to be universal AC/DC motors, so they might have laminations that would work. For the bell that you mount the magnets into, a stamped steel hole saw might come in a useable size. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5142 To give you an idea of how much power one of these motors supplies, some guys put 3 of them into a go-cart, and drive it through a centrifugal clutch. Watch the video, then look at the smiles when they come back in from a run! http://www.youtube.com/watch?v=vwODx028_Jw ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
