Cage Type Induction Motor and Core Loss — Lesson 2

This lesson covers the comparative study between slippery induction motors and cage induction motors. It explains why cage induction motors are less costly and how they can adjust to any number of stator poles. The lesson also discusses the impact of frequency on the synchronous speed of the rotating field and how the advent of power electronics converters has changed this. The lesson further delves into the equivalent circuit of a three-phase induction motor and how it applies to a cage induction motor. It also explains the concept of air gap power and how to calculate the torque developed by the machine. Finally, the lesson touches on the topic of Eddy current loss in the stator and rotor of the motor.

Video Highlights

00:22 - Comparative study between slippery and cage induction motors
03:49 - Explanation of the equivalent circuit of a three-phase induction motor
08:59 - Calculation of air gap power and torque
14:49 - Discussion on Eddy current loss in the stator and rotor

Key Takeaways

- Cage induction motors are less costly and can adjust to any number of stator poles.
- The synchronous speed of the rotating field can be varied by changing the supply frequency.
- The equivalent circuit of a three-phase induction motor can be applied to a cage induction motor.
- The torque developed by the machine can be calculated using the concept of air gap power.
- Eddy current loss occurs in the stator and rotor of the motor, with the loss in the stator being more significant due to the higher frequency.