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Resistance Method

 

The method for measuring a coil temperature rise: 
Since the value of a coil temperature rise is easily effected by ambient temperature, measuring temperature on the surface of a coil cannot yield any accurate measurements. Thus, the mean temperature is determined by the resistance method using the temperature coefficient of resistance of copper.

 

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Formula

T2 = (R2/R1 - 1) x (234.5 T1) + ΔT

R1: initial resistance
R2: final resistance after energization
T1: initial ambient temperature
T2: coil temperature rise
Δ
T: change in ambient temperature from the beginning to the termination of energization
When the ambient temperature rises, ΔT is subtracted. When the ambient temperature falls, ΔT is added.

January 01, 2000 00:01 AM

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