Why rotating machines are not allowed to run near critical
speed region?
Answers were Sorted based on User's Feedback
Answer / iamdon
The rotor is a structure having mass and elasticity.So it
will vibrate with a natural fcrequency which is balanced by
elastic force.The mass centre has an inherent eccentricity
from the centre of rotation.
The deflection tend to be very large near or at critical
speed and gives rise to considerable vibrations.This may
break the shaft.That is why rotating machines are not
allowed to run near or at critical speed.
Author:arbelectbit@yahoo.com
Is This Answer Correct ? | 7 Yes | 1 No |
Answer / s.krishnan
critical speed is above 20 percentage of rated
speed.rotating machine rotate near to critical speed the
motor bearings are damaged.so rotating machines are not
allowed to run near critical speed region.
Is This Answer Correct ? | 2 Yes | 5 No |
why current is denoted by I
kVA rating of ordinary transformer is increased when connected as an auto transformer because A transformation ratio increased B secondary voltage increased C energy is transferred both inductively and conductively D secondary current increased
IN Electric train which type of motor is used,for what reason they uses?
draw tube light circuit
Is it possible we are step down 11 kv to 230v ?
how to find out speed of single phase motor
What do you understand by oldham's coupling ?
what happen if transformer neutral not earth
what is the relation between reactive power and power factor for the what is the limit of reactive power and power factor
How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?
Why servomotor and induction motor are in different shape
what is the method to measure the transformer current carrieng capacity in three phase.