Operation of Electrical Rotating Machines (Contd.) — Lesson 2

This lesson covers the principles of operation of rotating electrical machines, focusing on the conditions necessary for the production of steady electromagnetic torque. It explains that the relative speed between the stator field and rotor field must be time invariant and that the number of poles produced by stator coil currents and rotor coil currents must match. The lesson also discusses the concept of a stationary field in a rotating machine, using the example of a DC motor. It further explores the distribution of the magnetic field along the air gap of a machine. The lesson concludes with an exercise for students to understand the disposition of the coil.

Video Highlights

00:36 - Discussion on the conditions for the production of steady electromagnetic torque
09:58 - Explanation of the concept of a stationary field in a rotating machine using a DC motor as an example
24:01 - Exploration of the distribution of the magnetic field along the air gap of a machine

Key Takeaways

- For the production of steady electromagnetic torque, the relative speed between the stator field and rotor field must be time invariant.
- The number of poles produced by stator coil currents and rotor coil currents must match.
- In a DC motor, the rotor rotates but the field created by it remains stationary.
- The distribution of the magnetic field along the air gap of a machine can be understood by drawing the developed diagram of the machine.