Hello Kirk, this motor looks like an ordinary asynchronous induction motor. It is constructed for slow drives with large angular momentum, for instance, a large fan propeller, slow running in order to make as little noise as possible. Supposedly it's been running on single phase AC, so there must be something added to give it a certain direction of rotation for the start. Usually, they use an additional winding or a starting condenser that is switched off by a centrifugal switch when speed is reached. In this case, it looks like a short circuit winding like in a split pole motor had been used, i.e., thick copper wire buried in the notches of the magnetic poles. This winding carries a large current which is delayed from the driving current (magnetic phase shifter). Maybe this short circuit winding is gone or has never existed. The short circuit and the axially short iron lenght causing the magnetic field reach far out in the air make up thermal and magnetic losses and thus a very bad efficiency, or large loss factor.
I wouldn't bother with this motor except for technical curiousity. Get yourself a disc motor (with a totally flat disc shaped copper rotor) and short axial magnetic field length and you have a high efficiency, high momentum and high angular acceleration drive. They make them as a brushless construction, too. Peter Blodow Kirk Wallace schrieb: > On Fri, 2011-11-11 at 20:56 -0500, gene heskett wrote: > ... snip > >> That is an odd duck, I cannot say I have seen one built like that. >> > ... snip > > In case anyone is interested, I have some pictures of my fan motor here: > http://www.wallacecompany.com/machine_shop/fan_motor/ > > There is a slot in each pole from the inner bore to somewhere under the > winding, plus a step or notch on the other side of the pole foot and on > the inside bore face. I suspect these cause the field to travel across > the bottom of the foot and force the rotor to travel in one direction > only. > > ------------------------------------------------------------------------------ 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
