How to Find Efficiency of Induction Motor

[Jay2OR]

Hello i need some help on how to find the efficiency of this Squirrel cage induction motor it is configured in a star connection.

3 phase power input = single phase power x3 right?
3 Phase power output = output power x3 right ?
Efficiency = ?

i have added a picture of what i have so far.

any ideas ?

 

[duke37]

I do not know what you mean by 3 phase power output.
Efficiency is output/input. The output power is measured by the torque and speed as you have done.
You just need to divide the two numbers and if you desire, multiply by 100 to get %.