This lesson covers the concept of pole phase modulation in induction motor drives, focusing on a 9-phase machine. It explains how the number of poles can be changed using pole phase modulation and the impact of this change on torque and speed. The lesson also discusses the machine modeling equations and how torque is directly proportional to the number of poles. It provides a detailed explanation of how to develop the winding and change the number of poles in a 36 slot 9 phase 4 pole machine. The lesson further explores the application of this concept in various fields such as traction, wind energy conversion systems, and aircraft propulsion applications.
00:00 - Introduction to pole phase modulation in induction motor drives
01:20 - Explanation of 36 slot, 9 phase, 4 pole winding diagram
04:42 - Analysis of flux lines formation
15:13 - Comparison of torque speed characteristics in different machines
17:08 - Comparison of different powertrains
- Pole phase modulation allows the number of poles in an induction motor drive to be changed, impacting the torque and speed.
- The torque in a machine is directly proportional to the number of poles.
- The concept of pole phase modulation can be applied in various fields such as traction, wind energy conversion systems, and aircraft propulsion applications.
- The use of pole phase modulation can lead to improved torque density and reduced footprints of transmission in multi-phase machines.