Tim Babcock Posted September 10, 2023 Posted September 10, 2023 I have a fan I am working on for a friend. Its an Emerson. The issues are the wiring, no big deal. But the speed coil is running the same speed on all settings. I have what I believe is a similar speed coil off an Emerson I could use in place. The one on the right is the one that was in my friends fan, the one on the left is my switch. I tested out the Ohms and my switch checking from the left to the right peg were the current flows to the head measured out at 3.6 and 2.5. The one that came on the fan measured out at 1,8 1.3 I believe this would indicate a short in the fans switch. Thanks for any help. Quote
Steve Sherwood Posted September 10, 2023 Posted September 10, 2023 What voltage is the fan rated for and what is the line voltage you are running? If the fan is rated at, let's say 104 volts and you are running it at 120 volts it will most likely run all settings at the same speed. As for those switches, there are not the same. It might work. I would connect the switch with some jumper wires outside the fan and run it, if it starts to smoke disconnect it immediately. Quote
Mark Olson Posted September 10, 2023 Posted September 10, 2023 (edited) What Steve said. The choke that you propose to test on your friends fan has a much taller iron laminate stack and proportionately more copper in it. The ohm readings that you measure are only part of the story, the impedance that the reactor presents to the motor is a much bigger factor. The reactance (read impedance to alternating current) is determined by the magnetic permeability of the iron (more iron, more permeability) and the number of turns of copper wire (more turns equals more impedance). The small choke that the fan came with is almost certainly a better match for the motor than the large one that you intend to test the motor with. This is not to say that it won't work, just to inform you that there is much more to a "speed coil" than just an ohm reading, which is only an indication of D.C. resistance, and has very little to do with impedance to A.C. A coil, or motor windings, can fail with "turn to turn " shorts which are difficult to discern with just an ohm meter and no data available as to what it should be. Edited September 10, 2023 by Mark Olson left out a word Quote
Tim Babcock Posted September 10, 2023 Author Posted September 10, 2023 1 hour ago, Steve Sherwood said: What voltage is the fan rated for and what is the line voltage you are running? If the fan is rated at, let's say 104 volts and you are running it at 120 volts it will most likely run all settings at the same speed. As for those switches, there are not the same. It might work. I would connect the switch with some jumper wires outside the fan and run it, if it starts to smoke disconnect it immediately. The fan runs fine outside of the same speed. There is nothing wrong with the fan or switch as far as heating up. The lady I am working on it for has had it running for a long time, she used this fan even though the line in wire was dangerous as some of the insulation was gone from the wire. I don't know how she did not short it. But I will take care of that no issues. I checked other models like this and its 115 volts. So it should be OK with 110 120. Unless that is wrong. I am not sure about how to further test this coil. does anyone have a link to a video? Thanks Quote
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