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Join Date: Mar 2012
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# Turns Per Coil

03/28/2012 6:46 PM

How can I calculate the number of turns per coil needed for a 3 phase motor, 4 poles, at 60 Hz? What formula will be used for any rewind coil in different kinds of motors?

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Location: Long Island NY
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#1

### Re: TURNS PER COIL

03/28/2012 7:03 PM

Sorry but there's not just one formula one should know to design a motor. A motor design class is more like a third or fourth year electrical engineering elective class.

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#2

### Re: TURNS PER COIL

03/28/2012 7:19 PM

In getting the wire size of run winding or starting winding we often used the wire guage to determine it size, but i dont know how to calculate the exact turns of it make a coil. unlike transformer there is a basic formula to calculate the primary winding or the secondary winding regarding its turns per volts,even though we dont pursue in any elective class to design a transformer. important is the basic equation that calculates the specific number of turns per coil.

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Join Date: Jul 2011
Location: Bengaluru, India
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#3

### Re: Turns Per Coil

03/28/2012 11:39 PM

What is the area of stator slot? And what is the power output of motor? Current and voltage values? Whether the motor is water cooled or no cooling for it? Single layer winding or double layer winding?

Then i can try to answer this question.

sharath

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#4

### Re: Turns Per Coil

03/30/2012 8:06 AM

Here are the available data where i get to nameplate of the motor. as for the voltage 220/380v,8.3amps/4.8amps, P.Factor .85,HZ 50, RPM 2860, HP 2.2kw,#3 phase, it was designed to run for delta and star connection.

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#5

### Re: Turns Per Coil

03/31/2012 2:06 AM

Dear XAS35,

We can't calculate number of turns by seeing only name plate details. It needs details such as area of a stator slots in which you can accomodate copper, and a value of current density which is different for natural cooled motors and water cooled motors. And whether it should be a single layer winding or double layered.

If we can calculate number of turns only by seeing nameplate details, then the motor design would be much easier for everybody!!!

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#6

### Re: Turns Per Coil

03/31/2012 8:15 AM

Dear sharath4,

thanks for your reply..now i understand what components are missing to have the a proper procedure to compute for the number of turns per coil, as for now the motor that i to rewind was send already to shop rewinding,and now i cant provide you the area of a stator slots. if you have list regarding the area of stator slots with corresponding turns/coil would you please provide me one,for me to be study it.

thanks and more power to you..

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#7

### Re: Turns Per Coil

04/01/2012 11:49 PM

You are welcome

There is no such list available as for my knowledge, It all comes when you start designing a motor.

You can go and watch how they will do rewinding, i think that they will weigh the total copper from the motor and again they will put the same amount of new copper for the same gauge.

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