Finding Full Load Current & Torque in Induction Motors

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SUMMARY

The discussion focuses on calculating the full load current and torque in induction motors, emphasizing the importance of impedance. The user calculated impedance in polar form but noted that only the magnitude was used in determining full load current, leading to confusion regarding the phase component. It is established that for full load current calculations, only the magnitude of impedance is necessary, as the amplitude of the current is derived from this magnitude. The phase of the current relative to the applied voltage corresponds to the impedance phase but does not affect the full load current calculation.

PREREQUISITES
  • Understanding of induction motor principles
  • Knowledge of impedance in electrical circuits
  • Familiarity with polar form representation of complex numbers
  • Basic concepts of current and voltage relationships in AC circuits
NEXT STEPS
  • Study the calculation of full load current in induction motors
  • Learn about the significance of impedance magnitude versus phase in AC circuits
  • Explore the relationship between torque and current in induction motors
  • Investigate advanced topics in AC circuit analysis, including phasor diagrams
USEFUL FOR

Electrical engineers, students studying motor control, and professionals involved in the design and analysis of induction motors will benefit from this discussion.

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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