Hello, i am Niko, memeber of RoboSap team. In this instructables i will show you, how to rewind and renovate old electric single phase electric motor. I bought this electric motor on garage sale. It was cheap and we known that motor burned out. I decided to buy motor and try to renovate it.

In next steps I will show you how do disassemble electric motor, remove bearings, make winding diagram, rewind motor, chose right capacitor and reassemble it with new bearings. Rewinding is very long process. It took about two days to rewind it, replace all old parts and reassemble it. Single phase motor usually has two coils, main with bigger resistance (generating a pulsating magnetic field) and auxiliary with smaller resistance (gives motor a direction of rotation). There must be a capacitor on the motor.

It includes voltage, frequency, phases, poles, outer diameter, slot count, kind of cooling, duty cycle, airgap length and more. All these are required to help you calculate winding data of a motor for particular HP more accurately. Emetor is a well-renowned brand that offers high quality electric motor winding calculator. So check them out.

Its value is different for different electric engines (for smaller electric engines around 20 microF). 2 capacitor can be on motor, 'run' capacitor (always connected, lower value capacitor) and 'Start' capacitor (connected with centrifugal switch, higher value capacitor) Picture 1: Scheme of single phase electric motor Picture 2: Run and star capacitor Picture 3: Wires from stator (there should be 4 wires from stator).

Great Post I have been looking for information like this for some time. Very well thought out.

I have a motor that I am trying to rewire. Not sure if it is shot and needs a total rebuild.

I have a couple questions. My Motor is a 32 channel stator it has thin wires around the interior with two wires coming from these windings (J,C) and it has thicker wires around the perimeter with four wires coming from these windings(1,2,3,4) The motor has a Capacitor with a centripetal clutch. I am pretty sure it is 220 volt. I have continuity on these wires (J-C) and (1-4) and (2-3) I am trying to find how to wire this to the 220 with the start capacitor.

Do you have any info on this?

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Electric motor winding calculator The winding calculator allows you to find the optimum winding layout for your electric motor in a fast and convenient way. You can investigate three-phase integer-slot, fractional-slot and concentrated windings, both with single and double winding layers where appropriate.

You can compare the maximum fundamental for different combinations of number of poles and number of slots, display the for different, or evaluate the harmonic spectrum of the winding factor. Emetor specifically disclaims any warranties, including, but not limited to, the implied warranties of merchantability, accuracy, or fitness for any particular purpose. In no event shall Emetor be liable to any party for any damages arising out of the use of information from this winding calculator.