We mounted motor on special test device, and connected it with measurement equipment. We tested next things:. Resistance of winding Free running test of an electric motor Test of the loaded electric motor Optimal voltage test Short circuit test Torque characteristic.
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 V, but now we have V in EU. In upper table there is data from manufacturer in first line. In second line is measurement at V and third line at V.
If we compare all data we can see that motor isn't bad at all. All parameters are very close together. 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. Thank you for your attention.
Question 1 year ago on Step Answer 5 months ago. Answer 7 months ago. Answer 1 year ago. I want 24 slot 2Pol 3 phase 1 kilowatt motor winding diagram, and 48 slot ,3 phase motor diagram and motor winding model, connection diagram please give me. Question 1 year ago.
Question 1 year ago on Introduction. Reply 1 year ago. Working as an industrial electrician this is counter productive vs purchasing a new one. However, some fantastic learning to be gained from this. I plan on having our apprentice look through this and also work through the calculations. Fantastic detail. Thanks for the time commitment and also for a great intructable!
Reply 3 years ago. I was curious about what the economics were for rebuilding such motors Could somebody make a living rebuilding these? I see several videos of people in India doing it, so I guess at least there it's a business. It's amazing the amount of effort and detail work that goes into it.
It seems like it wouldn't be worth it but I guess it must be at least marginally cheaper than building from scratch. Typically we will only rewind over 10hp. But yes there are companies out there that specialise in motor testing and rewinding. Please sir,single phase motor rewinding formula pdf send to gmail adress- pyithein gmail. Introduction: Rewinding 3 Phase Motor. More by the author:. If you have any questions you can easily message me.
I got this motor at my university. 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 [V] Motors nominal current for star Y and triangle D motor connection [A] Power of the electric motor [W] Power factor cos Fi Rotation speed [rpm] Nominal frequency [Hz]. Open the cover of conduit box.
You can detect burned motors winding by unique smell smells like burned lacquer. Remove rotor from stator. You can gently hit rotors axis with rubber hammer. Remove clamp, and safety ring if you have one. Then remove second cover. Do same on both sides of stator. Heat up winding with flame torch to burn out the rest of lacquer.
If you burned old lacquer you should be able to push remain winding out of stators gaps. Now measure dimensions of stators slot. If you have other shape of slot you look at upper picture. I copied this picture from book [Neven Srb; Elektromotori]. Pole step is distance on inner circle of stator, and it marks size of each pole. Stators yoke is part of stators package which extends from stators tooth to end of package. Br — 5, — 13, Hc — — 1, MGOe 1. Br — 6, — 10, Hc — — 1, MGOe 1.
Br — 3, — 4, Hci — 3, — 4, MGOe 2. Simple Shapes: Arcs, Rect. Br — 8, — 11, Hci — 11, — 21, MGOe — 18 — Br — 10, — 14, Hci — — 14, MGOe 27 — Br — 9, — 13, Hc — 50 — MGOe — 4. Bonded Flexible Callenered or Extruded. Br — 6, — 8, Hci — 4, — 18, MGOe — 7. Simple Geometry, Close Tolerancing W. Molded With Lower Tooling Cost. Spray and fluid bed drip applications in high-temperature cut-through resistance. Spray and fluid bed drip applications for high-temperature cut-through and bridging gaps.
Cold electrostatic fluid bed, hot venturi spray, or hot fluid be dip for fractional horsepower motor stators and armatures. Electrostatic fluid bed process, superior cut-through resistance and well heat, chemical and moisture resistance.
If you cant find it, you can measure it and find number in catalogue on internet. I took refurbished motor to university to make measurements. We mounted motor on special test device, and connected it with measurement equipment. We tested next things:. Resistance of winding Free running test of an electric motor Test of the loaded electric motor Optimal voltage test Short circuit test Torque characteristic. 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 V, but now we have V in EU. In upper table there is data from manufacturer in first line. In second line is measurement at V and third line at V. If we compare all data we can see that motor isn't bad at all. All parameters are very close together. 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.
Thank you for your attention. Question 1 year ago on Step Answer 5 months ago. Answer 7 months ago. Answer 1 year ago. I want 24 slot 2Pol 3 phase 1 kilowatt motor winding diagram, and 48 slot ,3 phase motor diagram and motor winding model, connection diagram please give me. Question 1 year ago. Question 1 year ago on Introduction. Reply 1 year ago. Working as an industrial electrician this is counter productive vs purchasing a new one.
However, some fantastic learning to be gained from this. I plan on having our apprentice look through this and also work through the calculations. Fantastic detail. Thanks for the time commitment and also for a great intructable! Reply 3 years ago. I was curious about what the economics were for rebuilding such motors Could somebody make a living rebuilding these? I see several videos of people in India doing it, so I guess at least there it's a business.
It's amazing the amount of effort and detail work that goes into it. It seems like it wouldn't be worth it but I guess it must be at least marginally cheaper than building from scratch. Typically we will only rewind over 10hp. But yes there are companies out there that specialise in motor testing and rewinding.
Please sir,single phase motor rewinding formula pdf send to gmail adress- pyithein gmail. Introduction: Rewinding 3 Phase Motor. More by the author:. If you have any questions you can easily message me. I got this motor at my university. 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 [V] Motors nominal current for star Y and triangle D motor connection [A] Power of the electric motor [W] Power factor cos Fi Rotation speed [rpm] Nominal frequency [Hz].
Open the cover of conduit box. You can detect burned motors winding by unique smell smells like burned lacquer. Remove rotor from stator. You can gently hit rotors axis with rubber hammer. Remove clamp, and safety ring if you have one.
Then remove second cover. Do same on both sides of stator. Heat up winding with flame torch to burn out the rest of lacquer. If you burned old lacquer you should be able to push remain winding out of stators gaps. Now measure dimensions of stators slot. If you have other shape of slot you look at upper picture. I copied this picture from book [Neven Srb; Elektromotori].
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