Electrical Machines, 2nd Edition

Appendix E

Separation of No-load Losses of an Induction Motor

To separate the no-load losses (iron losses and mechanical losses) of a three-phase squirrel cage induction motor, the circuit connection is made as shown in Figure E.1.

Figure E.1 Circuit Diagram

The name plate details of the motor and the autotransformer should be noted at first. The required apparatuses are ammeter, voltmeter, wattmeter, three-phase autotransformer and rheostat. The autotransformer’s initial position must be in the minimum voltage position and the motor need not to be loaded throughout the experiment. The required table (Table E.1) is shown in Figure E.1.

Table E.1 ...