Hey, I'm working on my first fan restoration, a Zero 1250r to be exact. Right now im in the process of cleaning the motor/strator. I would like to remove the coils, so I can replace the old paper with friction tape, and clean the metal housing. The problem I'm having is removing the metal tabs to get the coils off. This my first fan and first motor, any advice would be appreciated. Thanks.
Don't see how the rotor is held concentric to the stator so I would be reluctant to mess with the coils. These motors develop a small starting torque so any loss of alignment may result in motor not self starting when assembled.
I wouldn't attempt taking it apart unless you intend to or are prepared to rewind it. Moving and messing with coils that old can be enough to knock the enamel coating off.
The wire used in making the coils has an electrical insulating coating applied in the wire manufacturing process. Hence when this wire is used to wind a coil, there is no shorting between the turns of the coil even though they have physical contact. My guess is the paper around the coils is part of the coil manufacturing process and has no purpose once the finished coil is installed in the final product.
My guess is the paper around the coils is part of the coil manufacturing process and has no purpose once the finished coil is installed in the final product.
I think your guess is wrong. Rather than use my own words I'll copy from an Internet article...
"The conductor used during wiring is to be insulated from ground and each other as there is potential difference among them. In general, after few turns of winding insulation paper is inserted to avoid Inter-turn Breakdown.Suppose the winding is of 200V having 1000 turns, this means the difference between 1st turn and last turn will be about 1kV. So only Enameled insulation will not withstand this voltage.
Norm, I have never seen paper between turns on AC induction motor coils including the one in the picture of the AC motor provided by OP. The back EMF of the motor coils is controlled by the inductance of the coil and the rate of change of current. The polarity of the back EMF is opposite to the voltage that caused it. I think the info you copied is not for a AC motor coil. Just think, in the example above the coil thickness would grow by 3 inches if a sheet of 0.003 thick paper was placed between each turn. AC induction motor coils are immersed in shellac, then baked to insure no relative motion turn to turn that could result in a short. I doubt the motor in the OP's picture is larger than 3 inch wide by 3 inch high x length. Come to think of it, I also have never seen paper between turns on AC transformer coils. Have you?
In the factories I've been in the paper or tape is just used to hold the coil of wire together between steps in manufacturing. If you look a motor's windings the tape/paper is not continuous and is just a few bands which leave about half the windings exposed without any tape.
Hi!
I'm planning to diy wire a new sub panel in my detached garage in NJ to convert it to a music studio. I want to be prepared with my plan before I ask for a permit from the inspector, and I was wondering if I'm on the right track.
The main panel is an eaton cutler CH30JJM150N.
80' run from the main panel to the planned garage panel. I plan to use a 2 pole 60 amp breaker in the main panel. Wire is 2 hot/1 neutral 4 ga. Copper thhn/tnwn-2. Bare 6 ga. Copper ground. All in sch 80 conduit. Panel to the basement with wire in conduit hung from floor joists, exit house and trench from house to garage sub panel. Separate ground and neutral in subpanel, 2 ground rods at garage. Use a main panel with a 60 amp main breaker as a sub panel. Branch circuits are (1) 15 amp mini split circuit with outside shut off breaker for service, (1) 15 amp light circuit, 4 fixtures (1) 15amp power circuit, 6 interior outlets.
-Is this wire an acceptable choice?
-What size conduit would be good so it isn't too hard to pull the wire?
-Do I need to balance the load in the main panel? Both legs have 7 15amp circuits.
-Do all the new breakers need to be dual afci/gfci?
-I planned on having a couple exterior lights and 2 outlets. Do those need to be on a separate circuit?
Living in N. CA we are now faced with the utility turning off our power for safety reasons. We have a small Honda generator that will be enough to run the refrigerator and some smaller appliances / lamps. Our stove is gas and we can BBQ, water heater is propane.
My question is with the generator on the back deck will need to run extension cords to run refrigerator etc... so without leaving the back door open can I install a weatherproof receptacle on the outside with 4 outlets and direct wire the same on the inside and plug in the appliances?
Most of the time the wife will be home as where she works power would most likely be off also. This would be primarily at night when sleeping and when it would be raining.
Was looking for some type of weatherproof pass thru box to run electrical cords through the wall but internet searches didn't return many options for the application I'm looking for.
Any suggestions / ideas would be appreciated.
Kurt
12-09-20, 11:45 AM
