Week 10
Synchronous Machines
I revisit magnetic circuits, transformers, and rotating machines around my transformer report and calculation sheets.
What I connect in this unit
In a synchronous machine, the rotor field created by excitation locks to the stator rotating field. Changing internal-emf magnitude controls reactive power and power factor, while increasing load angle raises real power according to the power-angle relation until pull-out torque is approached.
Concept map
- Excitation
- Power-angle relation
- Power-factor control
- Pull-out torque
Technical anchor
For a cylindrical machine with resistance neglected, three-phase real power is approximately P = 3VE/X_s sin(delta), with the ideal steady-state limit near delta = 90 degrees.
How I review it
Choose generator or motor current and power sign conventions first, then inspect how excitation changes the phasor, reactive power, and power factor on one diagram.
Connection to the full course
Unit 10 of 12. Unit numbers expand the saved report and calculations into a reading sequence rather than an attendance record.