Effect of Variation Field Current in Synchronous Motor — Lesson 6

This lesson covers the fundamental aspects of synchronous machines, focusing on their operation, features, and the impact of varying the excitation. It explains how the power factor of a synchronous machine can be manipulated by adjusting the excitation under constant power operation. The lesson also discusses the concept of V curves in the context of synchronous machines, both in generator and motor mode. It further delves into the use of overexcited synchronous motors as synchronous condensers to improve the power factor in factories. Towards the end, the lesson introduces the concept of salient pole synchronous machines, highlighting the challenges in analyzing these due to their non-uniform air gap.

Video Highlights

00:32 - Explanation of power factor in synchronous machines
03:29 - Discussion on V curves in synchronous machines
14:33 - Use of overexcited synchronous motors as synchronous condensers
26:24 - Introduction to salient pole synchronous machines

Key Takeaways

- Synchronous machines allow for the manipulation of the power factor by varying the excitation under constant power operation.
- The V curves of synchronous machines depict the variation of the armature current as the field current changes.
- Overexcited synchronous motors can operate as synchronous condensers, providing leading current and improving the power factor in factories.
- Salient pole synchronous machines present a challenge in analysis due to their non-uniform air gap.