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In next step you will need to heat up old coils, and conduit box must be empty. Remove connections and conduit box from stator. Step 8: Removal of Old Winding First you need to cut old winding from stator. You must be careful because you can easily damage the axis of rotor.
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Step 7: Removal of Bearings Use puller to remove bearings on both sides. Remove clamp, and safety ring if you have one. I had metal ventilator so i heated it up. Step 6: Disassembling Motor Remove ventilator from rotors axis. You can gently hit rotors axis with rubber hammer. Step 5: Disassembling Motor Remove rotor from stator. If you cant separate cover and stator you can use rubber hammer. Usually they are attached on stator by long screws. Mark spots between first cover and stator and second cower and stator (we will need this marked points at motors assemble). Step 4: Disassembling Motor Take few picture of motor. Measure resistance for each winding, resistance between two different winding and You can detect burned motors winding by unique resistance between winding and motors frame. Resistance between two winding and winding frame should be more than 1,5 Mohm.īefore measuring remove all connections in conduction box. Resistances of three winding should be same (+/5%).
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Step 3: Analyse Winding Open the cover of conduit box. Step 2: Analyse Motor Motors Inscription board On the motors inscription board we can find most useful information about motor: Motors nominal voltage (for star (Y) and triangle (D) motor connection) Motors nominal current (for star (Y) and triangle (D) motor connection) Power of the electric motor Power factor cosFi Rotation speed Nominal frequency That's why motor speed is a little bit less then magnetic field speed ((3000 rpm That's why we call them Three phase ASYNCHRONOUS electric motor.īecause magnetic field must rotate faster than rotor to induce voltage in rotor. Current in magnetic field generates force. Because cage is short-circuited, voltage generatesįlow of electric current. Rotation magnetic field "cut" squirrel-cage, where it induces voltage. 3 phases generates rotation magnetic field so we don't need capacitor on three phase motor. Stator is used to generate magnetic field. Rotor is usually made as squirrel-cage, and it is inserted in stators Two main parts of motor are rotor and stator. It has very good efficiency and low manufacture and maintain costs. Three phase asynchronous motor is most common used motor in the world. Stator is made out of iron core and winding.
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Step 1: Analyse Motor I got this motor at my university. If you have any questions you can easily message me. It took about two days to rewind it, replace all old parts and reassemble it.
#ADAM JOHN DIRECTOR HOW TO#
In next steps I will show you how to analyse motors winding, disassemble motor, removeīearings, calculate new winding, rewind motor, reassemble it with new bearings and test motor. In this insctructables, i am going to make step forward. If you are searching for rewinding of one phase motor you can find it here. Hello everyone, i am Niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor.