How to define the beginning and the end of phases of the winding?

First way

We need the normal flat battery on 4,5 B and the combined measuring device (tester) or the milliammeter of the direct current. We rang previously windings the ohmmeter. We have several couples of wires, but we should define where at these couples the beginning of the winding and where the end.

Принципиальная схема соединения «треугольник»

Key diagram of the triangle connection.

We take any couple of wires belonging to one of windings. Conditionally we mark one of winding conclusions as the beginning (N), and the second as the end (To). We connect the tester on the limit of unit or tens milliampere of the direct current to any other couple of wires belonging to other winding.

Minus of the battery is attached to our conditional end (K) of the first winding. Concerning several times the beginning of the first winding battery plus, we watch indications of the tester. We are interested in otkloneneny shooters of the device at the time of circuit closing "the battery – the winding".

If the arrow of the device deviates in minus, then we switch polarity of connection of the device to the second winding and again several times we close the battery on the first winding.

Now device deviations at the time of short circuit have to be in the positive side. That conclusion of the winding which is connected to tester plus will be the beginning of the second winding, and with minus – the end. In the same way we define the beginnings of all other windings.

Second way

Схема определения начал и концов фаз обмотки

Scheme of definition of the beginnings and ends of phases of the winding.

We connect two any "found" phase windings consistently and we connect 220 V to the turned-out free ends, and we connect the control lamp to the remained third winding and quickly we give 220 V. Zapominayem as at us the lamp burns at the same time.

Now at windings which at us are connected consistently we change connection, that is we interchange the position of the ends of the second and again we give the power supply. The bulb has to be lit in a different way, either is brighter, or is weaker. If lit up more brightly, then windings at us were connected consistently, as it should be the beginning - the end - the beginning - the end. So also we sign them. We already know accurately two windings.

Now we connect any to the unknown of known and again already we bring 220 V to this couple, and to free - the lamp. Again we include the power supply. Now at once it will be visible on heat brightness as windings are included. We put the corresponding texts.

In the given example it is possible to use the voltmeter instead of the control lamp and to be guided on the device arrow deviation. Now, depending on the scheme of connection, it is necessary to connect windings. For the wye any three (though the beginning though the ends) we connect together, and to remained to three will move the power supply of 380 Century. For switching in the triangle it will be necessary to make still other manipulations.


Praveen Kumar: sir hum jante hain ki moter k daretion change karne k liye koi 2 phase change karte hsin lekin phase change karne per moter k ander asa kya ho jata hai ki moter disa badal deti hai magnetic flux to disa change karne se pahle bi ban raha tha aur phase change karne per bi megetic flux bnega

amar chand: नमस्कार सर सर इस मैथङ के जरिए हम कितनी एच पी तक की की मोटर टैस्ट कर सकते है प्लीज बताए सर ।

Moonjyoti Borah: voltmeter aak hi winding pe kyu lagaya.. diagram main kuch dya practical alag kya. kar kya raha hai tu

smrutiranjan mohapatra: Sir, what will be the current flowing through the motor while doing this test with providing 230 v supply to a particular winding of motor

Mugundhan J: What will be the effects on motor if connection of terminals are same (1-1 or 1-2)  or vise-versa....

Rannvijay Singh: Respected Sir, humne waise hi try kiya jaise apne video me dekhaya hai R2 ko Y1 se short karke and low voltage supply R1 and R2 par di toh motor gumne lag gyi and voice karke lag gyi jaise who khrab ho jayegi isliye mujhe laga yeah motor khrab ho jayegi isliye maine yeah check nhi kar paya aap bataye es se koi pro toh nhi hai

Frank Acosta: Excellent, unique youtube content video. No many so called "expert" electrical engineers know about this practical test as they assume motor winding terminals are "always" correct. Now, could you please, Sir, share your knowledge in English so English speakers could fully appreciate your teaching? Thankyou for sharing it.

PAWAN KUMAR: Sikandar Bhai very informative video and samjhane ka tareeka bahoot bathia hai. thanks for this. Bhai meri tulu pump 1/2 HP MOTOR HAATH SE GHUMANE PER CHALTI HAI AUR VO BHI DONO SIDE. Yani jis taraf ghuma dia usi tarf chal padi. maine capacitor bhi naya lga dia but problem solve nahi hui. bearing bhi thik hain. And es motor me 4 wire ek hi color & size ki nikli hui hain. 2 per capacitor lga hai & 2 supply ke liye nikli hui hain. please guide me as soon as possible please.
  1. Name

    Where to cling the ohmmeter?

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  2. Vladimir

    For engines of small power (if the shaft can be turned the hand) there is other, easier way.
    Ohmmeter vyzvanivay 3 windings. We connect the ends of windings on 3 together. We connect the milliammeter or the same ohmmeter. We rotate the shaft the hand. If the arrow of the device deviates — the beginnings and the ends are connected incorrectly. In that case we interchange the position of contacts of one of windings and we repeat experiment. If the arrow of the device ceases to deviate, means all beginnings and the ends are collected correctly. The method is based that the engine shaft, even new, always has residual magnetization.

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