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## 05/10/2020

### Hot Armature Resistance

• Let us consider that the initial temperature or room temperature says 20 degree centigrade and final temperature of armature be 60 degree centigrade.

As

R2 = R1 ( 1 + αt0 )

R20 = R0 ( 1 + 20α )

R65 = R0 ( 1 + 65α )

Where α0 = 1 / 234.5 ohm / ohm / 0C

Therefore

R65 /  R20 =  [ R0 ( 1 + 65α ) ]  / [ R0 ( 1 + 20α ) ]

R65 /  R20 =  [ 234.5 + 65 / 234.5 + 20 ]

R65 = 1.17 R20

•  If initial armature resistance at 20 degree centigrade was 1 ohm , it will become 1.17 ohm at 60 degree centigrade.
• It is called as hot armature resistance

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