1. EE1 PEEE Refresher Class Power Part 3 notes by T. Ernst EE1 – Power Part 3 NotesFall 2011, Page 1

2. Fall 2011, Page 2 EE1 – Power Part 3 Notes Induction Machines Motors Generators Synchronous Machines Motors Generators Double fed induction (variable speed synchronous)

3. Fall 2011, Page 3 EE1 – Power Part 3 Notes Induction Motors Squirrel cage

4. Fall 2011, Page 4 EE1 – Power Part 3 Notes Only generate torque when slip is not equal to 0 Slip frequency [hz] Slip speed [RPM]

5. Fall 2011, Page 5 EE1 – Power Part 3 Notes Synchronous speed f(frequency & poles)

6. Fall 2011, Page 6 EE1 – Power Part 3 Notes What is the difference between a motor and a generator? Slip? Power transfer?

7. Fall 2011, Page 7 EE1 – Power Part 3 Notes Induction motor nameplate

8. Fall 2011, Page 8 EE1 – Power Part 3 Notes Induction motor nameplate

9. Fall 2011, Page 9 EE1 – Power Part 3 Notes

10. Fall 2011, Page 10 EE1 – Power Part 3 Notes

11. Fall 2011, Page 11 EE1 – Power Part 3 Notes Locked rotor current example: 250 HP, code F

12. Fall 2011, Page 12 EE1 – Power Part 3 Notes Locked rotor equivalent impedance

13. Fall 2011, Page 13 EE1 – Power Part 3 Notes If FL (250 HP) speed is 3450 RPM, what is speed at 200 HP?

14. Fall 2011, Page 14 EE1 – Power Part 3 Notes

15. Fall 2011, Page 15 EE1 – Power Part 3 Notes

16. Fall 2011, Page 16 EE1 – Power Part 3 Notes Reduced Voltage Starting Auto-transformer Series inductor

17. Fall 2011, Page 17 EE1 – Power Part 3 Notes Reduced Voltage Starting ½ - ½ Wye start – delta run