Course Number: EET 141
Transcript Title: Motor Control
Created: May 12, 2014
Updated: April 20, 2017
Total Credits: 5
Lecture Hours: 40
Lecture / Lab Hours: 0
Lab Hours: 30
Satisfies Cultural Literacy requirement: No
Satisfies General Education requirement: No
Grading options: A-F (default), audit
Repeats available for credit: 0
Examines electromagnetism and motor theory, circuit protection elements (fuses and circuit breakers), control transformers, electromechanical and solid state switches, ladder logic, control relays, contactors, overload elements, manual motor starters, 2 and 3 wire motor starters, motor starters with jogging, friction brakes, reversing motor starters with interlocks, reduced voltage starters, timers, motor drives, and programmable logic controllers (PLCs). Students will build, test, and troubleshoot practical motor control circuits using industrial components on a motor control trainer board. Prerequisites: EET 112. Audit available.
Upon successful completion of this course, students will be able to:
- Apply operational theory of industrial three phase AC motors.
- Interpret manufacturer specifications of motors, circuit protection elements, contactors, auxiliary contact blocks, control relays, overloads, timers, switches, indicators, and other electromechanical elements.
- Interpret ladder logic diagrams and properly document them by numbering rungs, identify terminals, numbering wires, and numerically cross referencing rungs and mechanically interlocked devices.
- Build, operate, and troubleshoot electromechanical manual motor starters, two wire control circuits, three wire control circuits, reversing motor starters with interlocks, jogging circuits, reduced voltage starters, and timer controlled circuits.
- Build, operate, and troubleshoot motor drive controlled circuits and examine motor drive operational theory.
- Build, operate, and troubleshoot basic programmable logic controller (PLC) controlled circuits.
Outcome Assessment Strategies
Assessment methods are to be determined by the instructor. Typically, in class exams and quizzes along with homework assignments are used. Lab work is typically assessed by informal and formal lab reports, oral presentation, and possibly a lab exam. Evaluation is by unit exams, homework, and a comprehensive final exam.
Course Activities and Design
Lecture and discussion are the instructional methods used. Weekly homework is assigned. Laboratory activity includes building circuits on solderless circuit boards, electrical boards, making circuit measurements using test equipment, and electrical trades equipment, analyzing test data, and comparing predictions to theory and calculations.
Course Content (Themes, Concepts, Issues and Skills)
Apply safety principals to electrical and mechanical circuits.
1.0 Electrical Diagramming Skills.
2.0 Magnetism and Motion, DC.
Instructional Goal: To introduce magnetic fields, solenoids, DC motors, and DC generators.
3.0 AC Generators, Transformers, and Motors.
Instructional Goal: To introduce the concepts of AC solenoids, transformers, generators, and motors and manufacturers specifications.
4.0 Contactors and Motor Starters.
Instructional Goal: To explore types of switching used to control motors and generators.
5.0 Control Devices, Reversing Motor Circuits.
Instructional Goal: To introduce concepts of motor reversing control circuits.
6.0 Relays and Solid State Starters.
Instructional Goal: To introduce Relays and solid state starters.
7.0 Series - Power Distribution Systems.
Instructional Goal: To understand utilities role in power generation and transmission, and determine the common voltage sources associated with power distribution systems.
8.0 High Power Solid State Devices.
Instructional Goal: Introduce high power solid state devices, common sensors and control devices.
9.0 Reduced Voltage Starting.
Instructional Goal: Introduce methods of starting electric motors and solving related current surges.
10.0 Motor Speed Control, Acceleration and Deceleration Methods.
Instructional Goal: Introduce methods of controlling motor speed and motor braking.
11.0 PLC. Automatic control of motor and generator circuits.