Systems with Multiple Excitations — Lesson 3

The lesson covers the concept of field energy and how it changes with time, using a system with a cylindrical stator and rotor as an example. It further explores the impact of resistance on the system and introduces the concept of stable and unstable equilibrium points. Towards the end, the lesson delves into the implications of non-linear systems and introduces the concepts of field energy and co-energy.

Video Highlights

00:13 - Introduction
00:50 - Explanation of the concept of inductance and its role in a singly excited system
02:17 - Explanation of the field energy in a single coil system
05:43 - Discussion on the concept of field energy in a system with more than one coil
07:56 - Discussion on the reduction of hysteresis and eddy current losses in electromagnetic equipment
12:23 - Derivation of the expression for the field energy in a system with two coils
38:10 - Explanation of the concept of stable and unstable equilibrium points in a system
42:47 - Introduction to the concept of energy and co-energy in a non-linear system

Key Takeaways

- The generated torque in a rotational system is influenced by the angle of the rotor.
- In a singly excited system, it is essential for the rotor to have saliency.
- Field energy changes with time and plays a crucial role in the functioning of the system.
- Resistance can impact the energy stored in the field and the overall system performance.
- In a non-linear system, the concepts of field energy and co-energy are vital for estimating the generated torque.