Synchronous Motor Operation, Phasor Diagram and Power Expression — Lesson 4

This lesson covers the operations of synchronous machines, focusing on the generator mode and motor mode. It explains the concept of cylindrical rotor synchronous machines, where the air gap is uniform. The lesson also discusses the equivalent circuit of a synchronous machine, which is simpler than that of an induction machine due to the absence of a magnetizing branch. It further elaborates on the generator mode of operation, explaining how the generator delivers current and the relationship between terminal voltage, current, and synchronous impedance. The lesson also covers the motor mode of operation, explaining how the motor draws power from the source and the relationship between bus voltage, impedance, and excitation voltage. The lesson concludes with a discussion on the real power drawn by the machine in both modes of operation.

Video Highlights

00:26 - Explanation of cylindrical rotor synchronous machines
01:35 - Understanding the generator mode of operation
07:24 - Explanation of the motor mode of operation
18:00 - Discussion on the real power drawn by the machine

Key Takeaways

- Synchronous machines operate in two modes: generator mode and motor mode.
- In the generator mode, the machine delivers current, and the excitation voltage (EF) is always above the terminal voltage (V).
- In the motor mode, the machine draws power from the source, and the excitation voltage (EF) is always below the terminal voltage (V).
- The real power drawn by the machine in both modes of operation can be calculated.