how to calculate induction motor rating (HP) if name plate
is missing from motor at site condition ?
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Answer Posted / manoj
1. Switch on the motor & measure the current (i) using Clamp
meter.
2. The calculated current (i) should be multiplied with
250Watts.
3. The result value should be divided by 230Volts i.e the
present voltage ratings.
4. The result of the step 3 will be the induced motor
ratings in HP.
This is illustrated with a small example below:
Assume that a motor of 5HP 3-phase is not having a name plate.
For 5HP motor, the current ratings will be around 7amps.
As we all know that, 1amps=250Watts.
So, multiply 7amps with 250Watts i.e 7x250=1750
The result answer 1750is divided by present input voltage
i.e 230V.
1750/230=7.6
Hence the result answer is the induction motor's rating in HP.
Another easy method to calculate this is:
check the current & divide it with 1.39(current rating of 1
HP motor)
the result answer will be the motor rating in HP
| Is This Answer Correct ? | 26 Yes | 16 No |
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