Resistance measurement

[mbailey]

Can anyone tell me how the temperature correction factors are derived for correcting resistance to 25C in an electric motor?

thanks, mb

 

[edison123]

Assuming it is a copper winding, the resistance temperature coefficient is 1/234.5 per deg C at 0 deg C.


R2 = (R1)*(234.5+T2)/(234.5+T1)

Where R1 is the known (or measured) resistance at temperature T1 deg C

T2 is the temperature in deg C for which you want to know the new resistance R2

*Even inside a hard-boiled egg, there is a golden heart!!!*

 

[mbailey]

Thanks edison,

Now the next question. Is there a temperature correction factor that can be applied to the viscosity of varnish in order to standardize the measurements? If so, do you know what it might be? Thnaks, mb