This lesson covers the concept of inductance in electrical machines, focusing on machines with a cylindrical rotor, cylindrical stator, and salient pole rotor. It explains the challenges in determining the self-inductance of a single coil on the stator due to complex air variations and changing flux density waveforms. The lesson introduces the two-reaction theory proposed by Blondel to address these issues. It also discusses the concept of phase spread and the impact of a distributed stator winding on inductance. The lesson concludes with an explanation of how to determine the MMF variation of a uniformly distributed stator phase winding.

- The self-inductance of a single coil on the stator is difficult to determine due to complex air variations and changing flux density waveforms.
- The two-reaction theory proposed by Blondel helps solve this issue by converting the problem into a constant air gap case.
- In actual machines, the stator winding is distributed over a certain angle, known as the phase spread.
- The MMF variation of a uniformly distributed stator phase winding can be determined using Ampere's law.

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