No load rotational losses in Induction motor

qrb14143

Joined Mar 6, 2017
112
Is this circuit diagram specifically linked to the question being asked? The induction motor is often represented as a transformer as you'll no doubt be aware. When we do the no load test, we make the assumption that no useful power is being converted to torque, so we omit the secondary side of the transformer, as shown in your diagram. The only power being dissipated then is that of Rnl which is more commonly denoted R1 as per the solutions.
 
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