This lesson covers the derivation of expressions for mutual inductance between the coil on the rotor and the coil on the stator, and the self-inductance of the rotor coil. The lesson also discusses the challenges encountered in deriving an expression for the self-inductance of the stator coil. It further explores the flux density distribution around the air gap and how it changes with respect to the rotor angle. It expalains the concept the Blondel's two-reaction theory, which simplifies the understanding of the machine's behavior. This lesson also covers how to calculate the flux linkage due to the elemental flux.

- The flux density distribution around the air gap is not constant and changes with respect to the rotor angle.
- The flux density waveform and flux levels in the machine change with respect to the rotor angle, creating challenges in determining the self-inductance of the stator coil.
- The Blondel's two-reaction theory simplifies the understanding of the machine's behavior by assuming two air gaps in the machine, one representing the pole face regions and the other representing the inter-polar regions.
- The flux levels in the machine change depending on the rotor's position.
- The inductance changes with respect to the rotor angle.

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