Flux Density Distribution in Rotating Machines (Contd.) — Lesson 4

This lesson covers the concept of magnetic flux distribution along the air gap of a rotating machine, focusing on the use of a single stator coil. It explains how passing DC current through the coil creates a magnetic field, and how this field interacts with the rotor. The lesson also discusses the importance of the magnetic flux distribution pattern in determining the nature of the generated voltage in a conductor. It further explores the idea of using multiple coils to create a sinusoidal magnetic flux distribution, which is more desirable for generating sinusoidal voltage. The lesson concludes with a discussion on how to reduce the amplitude of harmonics in the magnetic flux distribution by selecting the span of the coil.

Video Highlights

00:52 - Discussion on the interaction of the magnetic field with the rotor
05:46 - Importance of magnetic flux distribution pattern in determining the nature of the generated voltage
08:16 - Exploration of using multiple coils to create a sinusoidal magnetic flux distribution
27:36 - Discussion on reducing the amplitude of harmonics in the magnetic flux distribution

Key Takeaways

- The magnetic flux distribution along the air gap of a rotating machine is crucial in determining the nature of the generated voltage in a conductor.
- Using a single stator coil creates a magnetic field that interacts with the rotor, but this does not result in a desirable sinusoidal magnetic flux distribution.
- Using multiple coils and selecting the span of the coil can help create a sinusoidal magnetic flux distribution, which is more desirable for generating sinusoidal voltage.
- It is possible to reduce the amplitude of harmonics in the magnetic flux distribution, making the voltage generated more sinusoidal.