scope:

This International Standard is applicable to three-phase cage induction motors and establishes two methods for determination of efficiency:

• Method 1: for motors tested by using a torque measurement device, with additional load losses derived from measurements;

• Method 2: for motors tested without torque measurement, with assigned additional load losses.

The two methods are different in the procedure to obtain the additional load losses. Unless otherwise specified, method 1 should be used for motors up to 150 kW.

For other methods of efficiency estimation, see IEC 60034-2.