Full Specifications What's new in version 1.2 Now you can work with rectangular wires to keep track of the medium and high voltage motors. Besides you can see the amperage based in both CMA & amperes per squared milimeter.

Hello everyone, i am Niko and, in this instructables i will show you, how to rewind and renew old three phase electric motor. If you are searching for rewinding of one phase motor you can find it. In this insctructables, i am going to make step forward. In next steps I will show you how to analyse motors winding, disassemble motor, remove bearings, calculate new winding, rewind motor, reassemble it with new bearings and test motor.

Rewinding is very long process. It took about two days to rewind it, replace all old parts and reassemble it. If you have any questions you can easily message me.

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I got this motor at my university. Three phase asynchronous motor is most common used motor in the world. It has very good efficiency and low manufacture and maintain costs. Two main parts of motor are rotor and stator. Rotor is usually made as squirrel-cage, and it is inserted in stators hole. Stator is made out of iron core and winding.

Stator is used to generate magnetic field. Download ramayan serial title song full. 3 phases generates rotation magnetic field so we don't need capacitor on three phase motor. Rotation magnetic field 'cut' squirrel-cage, where it induces voltage.

Because cage is short-circuited, voltage generates flow of electric current. Current in magnetic field generates force. Because magnetic field must rotate faster than rotor to induce voltage in rotor. That's why motor speed is a little bit less then magnetic field speed ((3000 rpm [Magnetic field] -- 2810 rpm [Electric motor])). That's why we call them Three phase ASYNCHRONOUS electric motor.

It took me about a week to rewind this motor. Most time i spent on calculation of new winding.

I had a lot of problems with calculation but i solved them and i got same parameters of winding as were on old one. I had a lot of problems with winding new winding too. First i made coils too small, and i couldn't insert last coils in slots.

I couldn't access to them because other winding were too small. Then i decide to make bigger one but i found problem again. This time winding was too big and i couldn't close the cover of motor.

Third time i successful rewind motor. Because gap between stator and cover was very small, i decided to do a little bit bigger first coils, and a little bit smaller last coils. You can se that on measurment of resistance where, winding resistances aren't identical. But in next measurement we can see that resistances do not dramatically affect on electric motors performance. I made all tests with two different voltages. Motor was made for voltage 380V, but now we have 400V in EU. In upper table there is data from manufacturer in first line.

In second line is measurement at 380V and third line at 400V. If we compare all data we can see that motor isn't bad at all. All parameters are very close together. I took all electrical equations and orientation tables from book: Neven Srb ELEKTROMOTORI I hope you enjoined my presentation of rewinding a three phase motor. If you have any questions please ask, and i will try to answer ass soon as possible.