Finding Full Load Current & Torque in Induction Motors

AI Thread Summary
To find the full load current and torque in induction motors, only the magnitude of the impedance is used, as it directly influences the amplitude of the current. The phase of the impedance is not considered in this calculation because the focus is on the maximum value of the current. The relationship between current and voltage is maintained through the phase angle, but it does not affect the full load current calculation. Understanding this distinction clarifies why only the magnitude is relevant for full load current. Thus, the amplitude of the full load current is determined solely by the impedance's magnitude.
ranju
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In an induction motor problem , I need to find the full load current & torque..for that I calculated the impedance with given data..& I got the impedance in polar form..But in the solution for finding the full load current they put only the magnitude of the impedance & not the phase..! I didn't get the reason actually ..maybe I'm missing some concept..Is it so that since we are calculating full-load current so only magnitude of the impedance matters & not its phase?.
 
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It is when we calculate the amplitude of current we take into account the magnitude of impedance. So the amplitude(maximum value) of the full load current depends only on the magnitude of the impedance.

The phase at which the current lags the applied voltage is equal to the phase of the impedance.
 
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