This lesson covers the concept of circle diagrams for induction motors, focusing on rotor parameters. It explains how the applied voltage is a constant rated value per phase and how the current phasor forms a circle on the diagram. The lesson also discusses the concept of 'slip' and how it affects the rotor copper loss and torque developed in the machine. It further elaborates on the power flow in the induction motor, including input power, stator copper loss, core loss, air gap power, rotor copper loss, and mechanical power output. The lesson concludes with a discussion on the efficiency of the machine and the power flow diagram under no load to full load conditions.

- The circle diagram of an induction motor is a graphical representation of the performance of the motor.
- The 'slip' in an induction motor is a measure of the difference between the synchronous speed and the actual speed of the rotor.
- The power flow in an induction motor includes input power, stator copper loss, core loss, air gap power, rotor copper loss, and mechanical power output.
- The efficiency of the machine can be calculated as the ratio of mechanical power output to total kilowatt input.
- The power flow diagram of an induction motor changes from no load to full load conditions, affecting the performance of the motor.

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