Download Electrical Motors and Control

John Wood Community College
Workforce Development Center
4220 Koch’s Lane
Quincy, IL 62305
Instructor: Stan Barnhart
Phone: (217) 222-7054
JWCC Mail Box Location: WDC
ELE 215
Electric Motors and Controls
Spring 2011
COURSE CATALOG DESCRIPTION:
A lecture/lab course covering the fundamentals of electrical and mechanical features of
electrical motors and transformers. A thorough analysis of single-phase and 3-phase AC motors
including repair and maintenance. A theoretical and practical approach to the operation, designing,
and maintenance of relay logic motor controller diagrams and circuits. Extensive study of solid
state controls including SCR’s, Triacs, and Unijunction devices, as well as fundamentals of solid
state digital logic control circuits and a treatment of 3-phase power concepts, transformers, and
protection devices. 1.5 lecture hours, 3 lab hours.
PREREQUISITES:
ELE 100 – Survey of Electrical Trade, ELE 110 – Introduction to Electricity, or consent of
instructor.
TEXT/REFERENCES:
Rockis, Gary J., Mazur, Glen A., Electrical Motor Controls for Integrated Systems. Third
Edition, Illinois, American Technical Publishers, Inc., 2005, ISBN 0-8269-1207-9.
Rockis, Gary J., Mazur, Glen A., Electrical Motor Controls for Integrated Systems
Workbook. Third Edition, Illinois, American Technical Publishers, Inc., 2005,
ISBN 0-8269-1208-7.
National Electrical Code Handbook-2007. Quincy, MA: National Fire Protection
Association, 2007.
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COURSE GOALS/OBJECTIVES:
Students who satisfactorily complete this course will be able to perform these goals without
the use of reference materials unless otherwise noted. Individual levels of performance will
comply with standards set within the textbook or through classroom presentation.
1. Describe proper safety procedures when installing, operating, and maintaining
equipment. Must demonstrate proper precautions in all lab activities.
2. Identify and describe the major parts of a split phase motor including the Stator, Rotor,
Start Winding, Run Winding, Start Switches, and Thermal Overloads.
3. Explain the meaning of motor control by giving examples of typical motor control
functions.
4. Describe the basic concept of automatic motor control and give examples of applications.
5. Describe the structure of AC motors by listing the basic components of an AC motor.
6. Explain the electrical and mechanical characteristics of motors by stating typical
specifications of motors and what those specs mean.
7. Describe some applications of single-phase motors in industrial and consumer
environments.
8. Explain what a ploy phase induction motor is and describe how it works.
9. Explain and demonstrate the reversal of a polyphase motor.
10. Describe applications and connections for two-speed motors by explaining how the motor
is configured and connecting to external circuit components.
11. Describe wound-rotor motors and how they differ from wound stator motors.
12. Describe how synchronous motors operate and give examples of applications.
13. Explain how a basic DV motor works by describing each component and its function.
14. Explain dynamic braking by describing how electromagnetic fields perform the task.
15. Recognize schematic symbols of motors and control components and describe their
functions.
16. Follow schematics of motor control circuits, demonstrate how to read the drawings, and
explain what the circuits are doing.
17. Define full-voltage and reduced-voltage starting by defining what they are and how they
differ.
18. Explain the specific differences between wound-motor starting and synchronous motor
starting.
19. Describe basic motor protection circuits by explaining possible motor failures and the
prevention of those failures.
20. Describe starting a basic DC motor in electro-magnetic terms.
21. Explain what a relay is, how it works, and its applications in motor circuits.
22. Explain the difference between a Voltage Relay and a Current Relay by describing how
each works.
23. Describe what a tine delay relay is and its application to motor circuits.
24. Describe an Overload Relay; its function, and its necessity.
25. Describe an automatic motor starter by explaining how it works.
26. Describe the difference between a Full-Voltage Starter and a Reduced-Voltage Starter by
defining the requirements of their individual applications.
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27. Describe 2 types of Speed Control Starters and explain how each works.
28. Define a Magnetic Starter for multi-speed motors by explaining how the components
work.
29. Describe the Reversing Starter and how it is wired by explaining how the reversing action
actually occurs.
30. Define a wound motor-rotor motor starter by describing each component and its function.
31. Describe a Capacitor Run motor and discuss a need for the capacitor.
32. Describe how to check/troubleshoot a capacitor by demonstrating doing it with an
ohmmeter.
33. Explain a series motor starter by describing how it works.
34. Be able to identify worn brushes and burnt armatures by demonstrating the ability to
identify them.
35. Be able to check windings for shorts and grounds by demonstrating how to check them
with an ohmmeter.
36. Know the meaning of End Play and Bearing Play by demonstrating how to check for
them.
37. Replace bearings in lab.
38. Define a Pressure Switch, Limit Switch, and a Flow Switch by describing their
application.
39. Identify all basic symbols used in motor control circuits by reading motor control
drawings.
40. Read and follow Ladder Diagrams.
41. Describe the operation of Sequence-Control circuit, follow sequence-control circuit
drawings, and explain how they work.
42. Explain the operation of motor control circuits with limit switches by explaining why
they are needed.
43. Define a Jogging Control by explaining its purpose and how it is achieved.
44. Describe an Automatic Plugging Control by explaining its purpose and how it is
achieved.
45. Explain the operation of an Acceleration Control by explaining its purpose and how it is
achieved.
46. Define Preselected Speed Control for a DV shunt motor by describing an application and
how it works in that application.
47. Read drawings that depict forward and reverse control.
48. Demonstrate competency in reading drawings that depict start, stop, and jog control.
49. Describe a primary resistance reduced-voltage starter by explaining how it works.
50. Define a line contactor by explaining how it works. Explain the function of an
accelerating resistor by defining its purpose and application.
51. Explain the function of an overload relay by defining its purpose and application.
52. Describe how a dynamic braking contactor works by explaining the action of the circuit
components involved.
53. Define plugging and antiplugging relays by explaining why and how they are used.
54. Describe causes of trouble and maintenance procedures for motor starters by
demonstrating proper maintenance procedures.
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55. Explain how to maintain brakes and clutches by demonstrating how to inspect and
maintain them properly.
56. Describe a general step-by-step procedure for troubleshooting control circuits using a volt
ohmmeter and/or an oscilloscope.
57. Explain the function of a motor control center by defining its purpose and why it’s
needed.
58. Define solid-state motor controllers by explaining their operation and reliability
advantages.
59. Describe the function of a diode by explaining its operational characteristics and
demonstrating its operation with an ohmmeter.
60. Describe the function of a Zener diode by explaining its operational characteristics.
61. Explain the characteristics of a tunnel diode by explaining its application to motor control
circuits.
62. Describe the operation of NPN and PNP transistors by explaining their operational
characteristics and their differences.
63. Define a unijunction transistor by explaining its application to motor control circuits.
64. Explain the operational characteristics and applications of SCR’s.
65. Explain the operational characteristics and applications of light activated semiconductors.
66. Describe the function of triacs and diacs by explaining their operational characteristics
and applications.
67. Describe basic solid-state starter relays for DC and AC motors and discuss their operation
and function.
68. Define a bridge rectifier by explaining what it does then demonstrate how it works with
an ohmmeter.
69. Explain the firing function of SCR’s and triacs in motor circuits by describing their
behavior and function in motor circuits.
70. Define the basic function of digital logic circuits and their characteristics.
71. Explain the operation and application of a basic transistor switch.
72. Describe basic operation of AND, OR, NAND, NOR, Buffer, and Inverter circuits by
demonstrating with Truth tables.
73. Demonstrate the voltage levels associated with TTL logic gates by measuring the levels
with a voltmeter.
74. Demonstrate the voltage levels associated with CMOS logic gates by measuring the
levels with a voltmeter.
75. Describe a basic latch circuit by using circuit gates to explain action.
76. Describe a J-K Flip-Flop by using circuit gates to explain action.
77. Troubleshoot logic circuits by using a voltmeter and/or oscilloscope.
78. Operate a basic DC power supply and explain their function and application.
79. Operate a voltage regulator and explain their function and application.
80. Troubleshoot DC power supplies by using a voltmeter and /or oscilloscope.
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COURSE OUTLINE:
Course schedule is subject to change with notification of instructor.
Week 1:
Week 2:
Chapter 3
Chapter 7
Week 3:
Chapter 6
Week 4:
Review/Chapter 4
Week 5:
Week 6:
Week 7:
Week 8:
Week 9:
Week 10:
Test over Chapters 3, 6, 7
Chapter 14
Chapter 8
Review/Chapter 9
Test over Chapters 4, 14, 8
Handouts/Chapter 5
Week 11:
Chapter 18
Week 12:
Review/Chapter 19
Week 13:
Test over Chapters 9, 18, 5,
and handouts
Chapter 12
Solid state devices and system
integration
Review for Final
Final Exam
Week 14:
Week 15:
Week 16:
5
Electrical Safety.
AC Generators, transformers,
and Motors
Solenoids, DC generators, and
motors
Electrical symbols and
diagrams
Relays and solid-state starters
Contactors and Motor Starters
Control Devices
Ladder logic diagram and
sequence control
Accelerating and Decelerating
Methods
Preventative Maintenance and
Troubleshooting
HOMEWORK SCHEDULE:
Workbook chapter 1
Workbook chapter 3
Workbook chapter 7
Workbook chapter 6
Workbook chapter 4
Workbook chapter 14
Workbook chapter 8
Workbook chapter 9
Workbook chapter 5
Workbook chapter 18
Workbook chapter 19
Workbook chapter 12
Pages 6-13
Pages 21-26
Pages 65-72
Pages 55-64
Pages 27-34
Pages 155-168
Pages 73-88
Pages 89-98
Pages 35-54
Pages 221-236
Pages 237-248
Pages 123-136
STUDENT CONTRIBUTIONS:
1. Attendance: Each student should plan on spending at least two hours per hour of instruction
preparing for class. Lessons build upon the concepts presented in previous lessons, so
attendance in both lectures and laboratories is critical. You are responsible for the material
presented in class. It is expected that students will attend all meetings of class. Late arrival
will count as an absence. Students who miss over three class sessions will have their final
grade reduced. Excessive absence will result in the student being administratively withdrawn
from the course.
2. Class assignments: Work submitted late will NOT be accepted. All homework and outside
assignments are due on or before the date set by the instructor. All in-class assignments are
due on the day of the assignment.
3. Exams and quizzes: All tests and quizzes are to be completed on the day they are given.
Students missing tests for justifiable reasons will be allowed to make up the tests at the
discretion of the teacher.
4. Disabilities: Students who feel they are not able to meet the requirements of the course
should contact the instructor, a counselor, or Student Services immediately. Every effort will
be made to accommodate student disabilities at the beginning of the semester. Incomplete
grades will NOT be awarded on the basis of avoidable conditions.
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DROP POLICY:
Following a withdrawal for courses eight weeks or longer, grades are recorded as follows:
Drop during first ten days of the semester
No grade recorded; class does not appear on
transcript
W
WI
Drop up to midterm
Drop after midterm, up to 75% completion of
the course
Drop after 75% completion of the course
Grade earned, A-B-C-D-F, as outlined in the
syllabus
For courses more than two days but less than eight weeks:
Drop during first five days of the semester
No grade recorded; class does not appear on
transcript
W
WI
Drop up to midterm
Drop after midterm, up to 75% completion of
the course
Drop after 75% completion of the course
Grade earned, A-B-C-D-F, as outlined in the
syllabus
ACCOMMODATIONS FOR A DISABILITY:
Students with disabilities who believe they have accessibility needs or the need for
academic accommodations must contact Disability Services, where those concerns are handled.
Disability Services is located within the Support Center in the Student/Administrative Center
building on the Quincy campus.
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COURSE EVALUATION:
1.
2.
3.
4.
Tests: There will be three announced, major tests during the course, plus the final.
Homework: Homework will be assigned periodically through the course.
Lab assignments: Lab assignments will be graded.
Percentage Grading Scale
90-100
A
80-89
B
70-79
C
60-69
D
0-59
F
Final Grade
Tests (5)
Homework
Lab grades
50%
10%
40%
NOTE: Final Exam is worth 2 test grades.
COURSE SCHEDULE:
This course will meet on Thursdays from 6:00 to 9:45 PM in Room W139 of the JWCC
Workforce Development Center, 4220 Koch’s Lane, Quincy, IL.
Class Cancelation notice:
Go to Current Students tab on the JWCC Home Page - http://www.jwcc.edu/
Inclement Weather – notification of school closings:
217-641-4100 or the JWCC Home Page – http://www.jwcc.edu/
JWCC Core Values
Self-development, Excellence, Accountability, Integrity
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