1/25/2011
ECE 431
Electric Machinery
Lecture 1
Course Introduction and History of
Electric Machines
Acknowledgement These handouts and lecture notes given in class are based on material from Prof. Philip Kreins ECE
431 lecture notes.
Disclaimer These hand
ECE 431 Electric Machinery
Spring 2011
Homework Assignment #2
Due in class on Friday February 4th, 2010.
Note: You are expected to review chapters 2 and 3 as needed.
1. A 1000 VA, 230/115 V single-phase transformer has been tested to determine its equival
1/29/2011
ECE 431
Electric Machinery
Lecture 2
Review of Three-Phase Systems (1)
Acknowledgement These handouts and lecture notes given in class are based on material from Prof. Philip Kreins ECE
431 lecture notes.
Disclaimer These handouts only provide h
1/29/2011
ECE 431
Electric Machinery
Lecture 3
Review of Three-Phase Systems (2)
Acknowledgement These handouts and lecture notes given in class are based on material from Prof. Philip Kreins ECE
431 lecture notes.
Disclaimer These handouts only provide h
1/30/2011
ECE 431
Electric Machinery
Lecture 4
Reactive Power Measurement and
Magnetics Review (1)
Acknowledgement These handouts and lecture notes given in class are based on material from Prof. Philip Kreins ECE
431 lecture notes.
Disclaimer These hando
ECE 431 homework assignment #3 Due in class Friday, February 11, 2011
1. Textbook problem 3.7. Use g=0.5 mm, A0=5mm2, and N=500 turns. The permeability of
the moving vane is infinite, but the core has a permeability c= r o where r=1000. In
part (b), you c
ECE 431 homework assignment #4 Due in class Friday, February 25, 2011
1. A 208 V, six-pole, Y-connected, 25 hp, 60 Hz three-phase induction motor is tested with
the following test results:
No load test: 208 V, 22 A, 1200 W, 60 Hz.
Locked-rotor test: 24.6