Fundamentals of Three Phase Induction Motors — Lesson 2

This lesson covers the fundamental concepts of three-phase induction motors. It begins with an explanation of the rotating magnetic field created by a balanced three-phase current. The lesson then delves into the workings of a three-phase induction motor, discussing the role of the stator and rotor, the concept of synchronous speed, and the impact of changing the supply sequence. The lesson also explains how the induced voltage in the rotor coil is affected by the relative speed between the coil and the field. Towards the end, the lesson introduces the concept of a phase shifter, which can manipulate the phase and magnitude of voltage.

Video Highlights

00:15 - Introduction to three-phase induction motors and the rotating magnetic field
01:12 - Explanation of the stator and rotor in a three-phase induction motor
03:34 - Discussion on synchronous speed and induced voltage in the rotor coil
16:10 - Discussion on energy storage in a 3 phase induction motor
30:35 - Introduction to the concept of a phase shifter

Key Takeaways

- A three-phase induction motor operates based on the rotating magnetic field created by a balanced three-phase current.
- The stator and rotor play crucial roles in the operation of a three-phase induction motor.
- The induced voltage in the rotor coil is affected by the relative speed between the coil and the field.
- A phase shifter can manipulate the phase and magnitude of voltage, providing a desired phase shift and level change of voltage.