I have a 3 phase motor looks like an older squirrel cage Brooks/Crompton sadly it's missing it's information plate.

What is the most accurate method of calculating it's KW or HP?

The motor is wired Delta and has an across the terminals resistance of 8.2 Ω dividing this by 1.5x gives a single winding resistance of 12.3 Ω.

Using Ohms law my calculations have given me this:

V/R = I. therefore 230v ÷ 12.3 Ω gives 18.6992 Amps (I)

230v x 18.6992 Amps = 4.3 Kw ÷746 = 5.765 HP

Looking at the size of the motor it dosen't seem big enough to be this powerful, but that said it won't run for long on my 2HP RPC before the switch trips out.

Any & all help appreciated.

Paul

What is the most accurate method of calculating it's KW or HP?

The motor is wired Delta and has an across the terminals resistance of 8.2 Ω dividing this by 1.5x gives a single winding resistance of 12.3 Ω.

Using Ohms law my calculations have given me this:

V/R = I. therefore 230v ÷ 12.3 Ω gives 18.6992 Amps (I)

230v x 18.6992 Amps = 4.3 Kw ÷746 = 5.765 HP

Looking at the size of the motor it dosen't seem big enough to be this powerful, but that said it won't run for long on my 2HP RPC before the switch trips out.

Any & all help appreciated.

Paul

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