INE 4090 - AC DC Motors Rotating Machines

1. List the parts of a DC shunt motor.
2. Draw the connection diagrams for series shunt and compound motors.
3. Define torque and tell what factors affect the torque of a DC shunt motor.
4. Describe counter-EMF (CEMF) and its effects on current input.
5. Describe the effects of an increased load on armature current, torque, and speed regulation characteristics of a DC shunt motor.
6. Make DC motor connections.
7. Draw the basic connection circuit of a series DC motor.
8. Describe the effects on the torque and speed with change in current.
9. Describe the effects of a reduction of a load on the speed of a DC series motor.
10. Connect a DC series motor.
11. Describe the torque, speed, rotation, speed regulation, and control characteristics of a cumulative compound-motor.
12. Connect DC compound motors.
13. Describe the characteristics of a differential compound-wound DC motor.
14. Describe the characteristics of a cumulative compound-wound DC motor.
15. Describe the need for starting controls for DC motors.
16. Define manual starters used with DC motors.
17. Describe the two basic types of manual DC motor starters.
18. Identify the drum controller section and read connecting diagrams.
19. Describe the connections that occur at each first position in forward and reverse of a drum controller.
20. Identify the major sections of an electronic DC motor drive.
21. Determine the operating features available to the end user.
22. Describe acceleration and deceleration and braking techniques.
23. Explain the operating concepts of DC drives for different motors.
24. Explain the operation of the CEMF method of acceleration for a DC motor.
25. Use elementary wiring diagrams, panel wiring diagrams, and external wiring diagrams.
26. Explain the ratings of starting and running protection devices.
27. Describe the operating principles of DC variable speed motor drives.
28. State how above and below DC motor speeds can be obtained.
29. List the advantages of DC variable speed motor drives.
30. Describe how solid-state devices can replace rheostats
31. Make simple drawings of DC motor drives.
32. List the advantages of using thyristors.
33. List the steps in the operation of a DC motor control with interlocked forward and reverse pushbuttons
34. Explain the principle of dynamic braking
35. Describe the operation of a CEMF motor controller with dynamic braking.
36. List several factors to be considered when selecting and installing electric motor control equipment
37. Explain the purpose of a contactor
38. Describe the basic operation of a contactor and relay
39. List the steps in the operation of a control circuit using start and stop pushbuttons
40. Interpret simple automatic control diagrams
41. Draw a simple magnetic control circuit.
42. Explain how relays operate
43. List the principal uses of relays
44. Describe different relay control and load conditions
45. Tell how SCRs operate
46. Identify relay component symbols
47. Connect different relays in a circuit
48. Identify and use various timers
49. Use proper timer symbols in schematic diagrams
50. To provide the student with an opportunity to evaluate the knowledge and understanding acquired in the study of the previous seven units
51. Describe the construction of a three-phase AC motor listing the main components of this type of motor
52. Identify the following items, and explain their importance to the operation of a three-phase AC induction motor: rotating stator field, synchronous speed, rotor-induced voltages, speed regulation, percent slip, torque, starting current, no-load power factor, full-load power factor, reverse rotation, and speed control
53. Calculate motor speed and percent slip
54. Reverse a squirrel-cage motor
55. Describe why a motor draws more current when loaded
56. Draw diagrams showing the dual-voltage connections for 240/480-volt motor operation
57. Explain motor nameplate information
58. State the purpose of an across-the-line magnetic starting switch
59. Describe the basic construction and operation of an across-the-line starter
60. State the ratings for the maximum sizes of fuses required to provide starting protection for motors in the various code marking groups
61. Describe what is meant by running overload protection
62. Draw a diagram of the connections for an across-the-line magnetic starter with reversing capability
63. Describe the basic sequence of actions of the following types of controllers when used to control three-phase AC induction motors;
    1. Jogging controller
    2. Quick-stop AC controller (plugging)
    3. Dynamic braking controller
    4. Resistance starter controller
    5. Automatic autotransformer compensator
    6. Automatic controller for wound-rotor induction motors
    7. Wye-delta controller 
    8. Automatic controller for synchronous motors
64. Identify and use the various National Electrical Code sections pertaining to controllers and remote-control circuits for motors
65. State why AC adjustable speed drives are used
66. List the types of adjustable speed drives
67. Describe the operation principles of various AC adjustable speed drives
68. Describe the basic controls used for medium-voltage motors
69. List the advantages and disadvantages of selected units
70. Use the correct terminology when selecting the proper motor-controller parameters
71. Identify the operating characteristics of solid-state starters
72. Determine the advantages and disadvantages of solid-state starters
73. Determine the correct application of solid-state pilot devices
74. Note the differences between National Electrical Manufacturers Association (NEMA) controllers and international Electrotechnical Commission (IEC) controllers
75. List the main components of a wound-rotor, polyphase induction motor
76. Describe how the synchronous speed is developed in this type of motor
77. Describe how a speed controller connected to the brushes of the motor provides a variable speed range for the motor
78. State how the torque, speed regulation, and operating efficiency of the motor are affected by the speed controller
79. Demonstrate how to reverse the direction of rotation of a wound-rotor induction motor
80. List the basic parts in the construction of a synchronous motor
81. Define and describe an amortisseur winding
82. Describe the basic operation of a synchronous motor
83. Describe how the power factor of synchronous motor is affected by an under excited DC field, a normally excited DC field, and an overexcited DC field
84. List at least three industrial applications of the synchronous motor
85. To provide the student with an opportunity to evaluate the knowledge and understanding acquired in the study of the previous six units
86. Describe the basic operation of the following types of induction motors:
87. Split-phase motor (both single and dual voltage)
88. Capacitor-start, induction-run motor (both single and dual voltage)
89. Capacitor-start, capacitor-run motor with one capacitor
90. Capacitor-start, capacitor-run motor with one capacitor
91. Capacitor-start, capacitor-run motor having an autotransformer with one capacitor
92. Compare the motors in the preceding listing with regard to starting torque, speed performance, and power factor at the rated load
93. Identify shaded pole motor components and operation
94. Describe the operations of stepper motors
95. Determine two types of Servo motors
96. Explain how motion control and feedback are obtained with servo motors
97. Explain how braking and regeneration works
98. Describe the operation of a simple selsyn system and a differential selsyn system
99. List several advantages of selsyn system
100. Describe the basic operation of a universal motor
101. Explain how a single-field compensated universal motor operates
102. Explain how a two-field compensated universal motor operates
103. Describe two ways in which universal motors are compensated for excessive armature reaction under load
104. State the reasons why DC motors fail to operate satisfactorily from an AC source
105. Describe the basic steps in the operation of the following types of motors:
106. Repulsion motor
107. Repulsion-start, induction-run motor
108. Repulsion-induction motor
109. State the basic construction differences among the motors in the preceding list
110. Compare the motors in the preceding list with regard to starting torque and speed performance
111. Determine the operating characteristics of an energy-efficient motor
112. Select the proper efficiency points for motors operating at reduced frequencies
113. Determine when to use inverter duty motors
114. Select integrated motor and controller applications
115. Determine, for several types of three-phase AC induction motors, the
     1. Size of the conductors required for three-phase, three-wire branch circuits
     2. Sizes of fuses used to provide starting protection
     3. Disconnecting means required for the motor type
     4. Size of the thermal overload units required for running over current protection
     5. Size of the main feeder to a motor installation
     6. Overcurrent protection required for the main feeder
     7. Main disconnection means for the motor installation
116. Use the National electrical Code (NEC)
117. Determine the requirements for installation for AC single-phase motors
118. Follow the National Electrical Code requirements and find code references
119. Install typical residential applications of single-phase motors to meet the code
120. Follow NEC installation requirements for DC motors
121. Perform routine inspection and maintenance checks of motors
122. Perform the following simple test:
     1. Measure insulation resistance
     2. Use a growler to locate short-circuited coils
     3. Perform continuity checks for open-circuited coils
     4. Measure balance to determine phase currents under load
     5. Measure speed variation
123. Replace and lubricate sleeve and ball bearings according to manufacturers’ directions
124. Lubricate motors according to manufacturers’ directions