Flux Density Distribution in Rotating Machines — Lesson 3

This lesson covers the concept of flux density distribution along the air gap of a machine. It explains how to calculate the B distribution and the assumptions made during the process. The lesson also discusses the Ampere circuital law and its application in finding the field around a conductor. It further explains the concept of reluctance and its implications in a magnetic circuit. The lesson then delves into the calculation of the value of H at different points in space and the resulting flux density waves. Towards the end, the lesson discusses the generation of AC voltage and the conditions required for generating sinusoidal induced voltage.

Video Highlights

02:58 - Application of Ampere circuital law
04:34 - Implications of reluctance in a magnetic circuit
09:10 - Calculation of the value of H at different points
23:44 - Generation of AC voltage and conditions for sinusoidal induced voltage

Key Takeaways

- The flux density distribution along the air gap of a machine can be calculated using the Ampere circuital law.
- The permeability of iron is assumed to be very large compared to air, and linearity is assumed for the calculations.
- The value of H at different points in space remains constant, resulting in a rectangular flux density wave.
- The generation of AC voltage requires a sinusoidal distribution of B. The shape of the voltage waveform against time will be the same as the distribution of B along the distance.