On Friday, November 11, 2011 08:56:00 PM Kirk Wallace did opine: > On Fri, 2011-11-11 at 17:15 -0500, gene heskett wrote: > > On Friday, November 11, 2011 05:13:00 PM Kirk Wallace did opine: > > > On Fri, 2011-11-11 at 12:42 -0800, Kirk Wallace wrote: > > > > I noticed each pole has a split at an angle which reminds me of a > > > > split-phase motor which uses the split to get the single phase > > > > motor to start in the proper direction. > > > > > > Oops, correction I meant shaded pole motor: > > > http://en.wikipedia.org/wiki/File:Shaded_pole_detail.jpg > > : > > :) > > > > And you might have had more luck with that had you cut and removed > > that single shorted turn of copper around that smaller section of > > each pole. > > > > Cheers, Gene > > There isn't a copper loop that I can see, just a slot and slight step in > the pole foot. There might be one under the main winding, but there is > no indication of it. There are three wires, tiny, small, and a little > larger, wound in parallel on each pole. My guess is they are wound North > then South until the sixth pole where they are commoned to Neutral. The > speed switch controls which of the three wires are powered, and > therefore how strong the fields are. Without a fan blade the motor turns > the same speed, around 1100 RPM, or used to, before I hacked it up. With > a fan or load the rotor slips at a rate dependent on the field strength. > This is a little strange to me because I am used to induction motors > with very little slip. Realizing that the fan speed is dependent on > field strength, I guessed that an SCR speed controller would also work, > which seems to work fine on one of my speed controllers, but not on the > one labeled "router controller" (it may have a lot of DC on the output). > I'll have to try a light dimmer next.
That is an odd duck, I cannot say I have seen one built like that. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Cobol programmers are down in the dumps. ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
