how to calculate the speed of a induction motor without
using tacho meter?
Answers were Sorted based on User's Feedback
Answer / thomas dsouza
The speed is given by the formula N=(120xf)/P where f is
the frequency say 50hz or 60hz and P is the no of poles.
A 4 pole motor shall be running at a speed of =(120x50)/4
that is 1500 rpm.
Is This Answer Correct ? | 23 Yes | 8 No |
Answer / shahulsnfa
Mr. thomas you were saying about the rated speeed
(synchronous speed). the question is about the real speed
(shaft speed).
Is This Answer Correct ? | 13 Yes | 0 No |
Answer / mr. kiru
shaft speed = synch speed-{(slip*synch speed)/100}
Is This Answer Correct ? | 12 Yes | 2 No |
IN COMMON MOTORS SLIP=4%
IN THAT CASE A MOTOR WITH SYNCHROUNOUS SPEED 1500RPM WOULD
BE A SHAFT SPEED = 1440 RPM
I think Mr. Kiru is correct
Is This Answer Correct ? | 5 Yes | 0 No |
Answer / thomas dsouza
These questions are asked for interview purpose and one
likes to test the appplication of the academic knowledge of
the candidate at times in practical situations to know
about the particular equipment. This will not be accurate
for practical conditions. However, as you mentioned, the
speed mentioned was synchronous speed only and if one knows
the % slip it can be deducted to get the actual speed.
But for any purposeful recording/analysis of the actual
speed one may have to use a measuring instrument only to
get the exact values.
If there is a better answer anybody pls advice.
Is This Answer Correct ? | 3 Yes | 1 No |
Answer / k.prakashchandra
Stroboscope,if the slip is not too much
Is This Answer Correct ? | 0 Yes | 0 No |
plz tell me about detailof induction motor Slip
why transformer is conneted to dc for polarity test.it doesnt work in dc?
hello! sir i did three year of diploma in electrical (2007- 2010) and now i m a student of electrical engineering. sir can i apply for germany visa for study and part tome work over there?
What is differance between Slip ring motor and Squirrel cage Motor ?
how does a submersible pump work..?
how to calculate current carrying capacity in power cable?
why restricted earth fault protection can not operate for phase faults??as there will be a current in secondary of ct,when a phase fault occurs!
In TNC switch, is there any 1NO+1NC block ? and if we move over closing position, is ther any affect on trip position or vice versa?
on what factor insulation resistance depends
What is a liquid resistance starter?where it is used??
what is sevice settings for mccb?How can be it setted?
which seven wonders are selected in india in 2008-2009