to calculate the weight copper 2

[martense]

Dear All,
if i have data for a motor :
number of coil ,turn/coil,pitch,AGD,CMA,stator core length,core diameter, connection,slots, wire size, is it possible for me to calculate the weight of copper for the wire from those data?by the way this is for low voltage motor

thank you,

regards,
Marten

 

[electricpete]

Start with length per turn. My guess is the length of one turn is roughly 4 times the length of the core (one length per coil side and one length per end), maybe a little more for 2-pole. I'm sure others can provide better guess.

Total coper length is (number of coils) times (number of turns per coil) times (length of one coil.)

Total length times area (circular mils, with appropriate conversions) is volume

Volume times density is weight.

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[rhatcher]

electricpete (*) has the right idea in saying that you can estimate the coil length based on the core length and then determine the weight of copper required. To complete his idea and to determine the weight of copper required, you need to get the compete data which includes the wire gauge, # turns, # coils, coil span, coil length (nose-nose), and core length. From this data you can determine the diameter of the coils,the numberof turns and size of wire, and therefore the weight. If I left anthing out then hopefully someone else will mention it.

I will add that you can always make a sample coil matching the data that you are copying and then use that single coil to determine directly the amount of copper that the complete rewind will require. In fact, the use of a 'sample coil' is a good practice since it allows you to check the fit (slot fill and end bracket clearance) of a single coil before manufacturing a complete set of coils that may not fit correctly.

 

[zlatkodo]

Hi, Martens,
The previous proposals were correct.
But if you need an approximate value for a specific case, please, write all the data you mentioned.
I have a large collection of data for squirrel-cage motors (see excerpt attached), from which I can pull you an approximate value of the weight of copper. Of course, this value is not exact because it depends on the manufacturer, model and age of the motor ...
Regards.
Zlatkodo

 

[martense]

electricpete,ratcher and zlatkodo thank you..

regards,
Marten

 

[waross]

Hello zlatkodo;
I understand that you have spent a lot of time and effort compiling your motor data tables. Thank you for sharing with Eng-Tips members. LPS
Yours
Bill

Bill
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