Aaron Gillette Posted October 22, 2022 Share Posted October 22, 2022 In my effort to rewire a GE fan motor ca. 1930, shaded poll, four field coils, ungrounded, the motor runs backwards, counterclockwise. It certainly is blowing air out, but behind the blades, not in front of them. I thought reversing the direction of the current in the leads to the power source (in other words, swapping the + for the - and visa versa) would change the direction of the rotor, but no. So I guess I need to take the motor apart, rotate the stator 180 degrees, and reassemble? Every time I dissemble or reassemble the motor I have to bang the hell out of the motor housing to pull it off the stator, chipping the new paint and leaving little dents all over the motor housing rims. But if I must, I must, I suppose. Quote Link to comment Share on other sites More sharing options...
Stan Adams Posted October 22, 2022 Share Posted October 22, 2022 Ha I did the same thing in my early days. The stator is in backwards. On those GEs, the headwire is run through the stator & out the other end. On reassembly it is really easy to forget this & put the stator in backwards making it turn in reverse. BTW, polarity makes no difference on an induction motor. Quote Link to comment Share on other sites More sharing options...
Jim Kovar Posted October 23, 2022 Share Posted October 23, 2022 20 hours ago, Stan Adams said: The stator is in backwards. Right-on!, Stan. The direction of rotation of shaded pole motors is from the unshaded parts of the poles towards the shaded parts. Quote Link to comment Share on other sites More sharing options...
Jim Kovar Posted October 23, 2022 Share Posted October 23, 2022 Anybody else see what'swrong with the diagramabove? Quote Link to comment Share on other sites More sharing options...
Ron May Posted October 23, 2022 Share Posted October 23, 2022 2 hours ago, Jim Kovar said: Anybody else see what'swrong with the diagramabove? Looks like 3 of the coils are wound CCW and one is CW. Quote Link to comment Share on other sites More sharing options...
Russ Huber Posted October 23, 2022 Share Posted October 23, 2022 10 minutes ago, Ron May said: Looks like 3 of the coils are wound CCW and one is CW. Make sense of the 9 o'clock winding. Follow the wire in and around to the next pole. 🙂 Quote Link to comment Share on other sites More sharing options...
Jim Kovar Posted October 23, 2022 Share Posted October 23, 2022 (edited) 2 hours ago, Ron May said: Looks like 3 of the coils are wound CCW and one is CW. Keen eye, Ron. The red arrows show current direction during one half cycle and of course the current reverse during the other half cycle. Now, if the 3 o'clock coil was reversed, we'd have a... "spinner - spinner, chicken dinner." Edited October 24, 2022 by Jim Kovar 1 Quote Link to comment Share on other sites More sharing options...
Jim Kovar Posted October 24, 2022 Share Posted October 24, 2022 (edited) Here's how one can determine magnetic polarity using the "Left Hand Rule." The "Left Hand Rule" is used for electron (nonconventional) current flow. I once had an old-school instructor who used conventional (current flows from positive to negative) flow in his instruction. Told us all, "Sh!t doesn't flow uphill!" I.e. kinetic energy always flows from a higher potential to a lower. I think there may have been some holes in his theory concerning current flow? Edited October 24, 2022 by Jim Kovar 1 Quote Link to comment Share on other sites More sharing options...
Russ Huber Posted October 24, 2022 Share Posted October 24, 2022 (edited) Notice where the wire comes in at the top (arrowed stator winding) to make its first wind around the pole. Follow the course of the wires first wind around the pole carefully with your eye. Now notice the second wind to the left of the first is coming up from the underside of the stator across the top of the stator traveling down to the underside of the stator of the next pole. Now following the first wind carefully with your eye once again, how in the h ell did that wind connect to the second wind to the left of it? The error he made was drawing the second outside wind, and because like most of my pencils his eraser is worn and gone to correct the error. Edited October 24, 2022 by Russ Huber Quote Link to comment Share on other sites More sharing options...
Jim Kovar Posted October 24, 2022 Share Posted October 24, 2022 Or Russ, possibly another explanation... A small "loop-de-loop"hidden on the backside. Quote Link to comment Share on other sites More sharing options...
Russ Huber Posted October 24, 2022 Share Posted October 24, 2022 1 hour ago, Jim Kovar said: Or Russ, possibly another explanation... A small "loop-de-loop"hidden on the backside. No eraser. Time to give it a rest. Quote Link to comment Share on other sites More sharing options...
Jim Kovar Posted October 24, 2022 Share Posted October 24, 2022 13 minutes ago, Russ Huber said: Time to give it a rest. Quote Link to comment Share on other sites More sharing options...
Alec Burns Posted October 25, 2022 Share Posted October 25, 2022 Happens to me on a BMY few months back. Turned out I had the two head wires hooked up to the switch incorrectly. Quote Link to comment Share on other sites More sharing options...
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