Leakage Inductances in Electrical Machines — Lesson 5

This lesson covers the concept of leakage inductances in electrical machines. It delves into the equations used to calculate leakage inductances and other inductance values, explaining how the interaction of two fluxes or currents results in torque. The lesson further discusses the impact of leakage reactances or leakage inductances on stator and rotor currents. It also explains the five types of leakage flux components and how they contribute to the effective leakage inductance. The lesson provides a detailed explanation of how to calculate the leakage inductances for different types of slots and windings in a machine. For instance, it explains how the slot shape affects the slot leakage and how the number of poles influences the end winding leakage.

Video Highlights

00:00 - Introduction
00:20 - Discussion on the interaction of fluxes and currents
00:42 - Explanation of the impact of leakage reactances on stator and rotor currents
02:23 - Classification of leakage flux components
03:29 - Explanation of slot leakage flux
06:14 - Discussion on belt leakage flux
09:15 - Explanation of harmonic or belt leakage flux
10:09 - Discussion on zigzag leakage flux
11:22 - Explanation of skew leakage flux
12:30 - Calculation of leakage inductance for stator and rotor
31:32 - Effective bar inductance

Key Takeaways

- The torque production in electrical machines involves the interaction of two fluxes or currents.
- Leakage inductances are caused by leakage fluxes and significantly impact the stator and rotor currents.
- There are five types of leakage flux components: useful flux, slot leakage, end winding leakage, harmonic or belt leakage flux, zigzag leakage flux, and skew leakage flux.
- The slot shape, number of poles, and winding arrangement significantly influence the leakage inductances.