1. EET 272 Quiz 4 Review Wound Rotor and Synchronous Motors

2. What variable-Speed motor allows you to change the speed by changing the number of poles in the motor?

3. What special 3-phase motor has a rotor that uses wire wrapped on the rotor, connected to resistors for startup?

4. What is one disadvantage of a Synchronous Motor?

5. How many sets of windings in a Consequent Pole Motor would be required to have a low and high speed?

6. What three-phase induction motor is designed to run with 0% slip?

7. When manually starting a Wound Rotor Motor (WRM), what device is used to insure the motor is started with the highest resistance in series with the Rotor Coils? (It is a very small answer.)

8. In what two ways can the rotor of a Synchronous Motor be Excited? (it can come from the outside or inside)

9. How is a WRM accelerated? (What is increased or decreased? (Don’t fight the simple answer.))

10. Aside from running at frequency- speed over the entire load-range, what is the other advantage of a Synchronous Motor and how is it achieved? (exciting answer)

11. Why is the starting Torque of a WRM better than other AC motors?

12. When starting a Synchronous Motor, what special windings are used?

13. Aside from manual starting and using time-delay relays, what third method can be used to automatically start a WRM? (This question comes up frequently.)

14. What device is used with a Synchronous Motor to make sure the motor does not begin generating voltage on the Armature when transitioning to full speed? (the problem is a charge due to the magnetic field and is not a former president)

15. Does a Consequent Pole Motor allow a 4-speed motor with the same torque at each speed?

16. Identify the motor and lable the leads

18. Quiz 4 Lab Implement the control Circuit of Figure 31-8. Us the LogixPro I/O simulator using the following I/O: (12/20) Get M and S outputs to close with all timers set to 5 seconds. (14/20) Use the lights to indicate the motor speed (16/20) All rungs are commented and all components have symbols (including the Timers and their contacts). (18/20) Have the speed indicator flash every ½ second if the motor is started and accelerating to that speed. Have the light stay on when the speed is reached. (20/20) If the Overload Aux Contact opens, alternately flash (every 1 Second) the 1 st an 3 rd speed lights and the 2 nd and 4 th speed lights. I/0StopI/33 rd SpdO/0MO/32 nd S LtO/6S3 I/11 st SpdI/44 th SpdO/11 st S LtO/4S2O/74 th S Lt I/22 nd SpdI/5N.O.OLO/2S1O/53 rd S Lt

19. Lab Pointers Again, you will need to bring your Jump Drive and LogixPro Disk This program is only similar to the program you will be assigned. You will not figure this lab out in 45 minutes, you will need to work it out in advance.