05/10/2020

What do you mean by 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

You may also like :

Compare ideal voltage source and ideal current source

Harmonics Generation and its effect

Voltage harmonics and current harmonics

Power Distribution Companies in India

What do you mean by AC Drive?


No comments:

Post a comment