Course Title: Advanced AC Machines

Part B: Course Detail

Teaching Period: Term2 2010

Course Code: EEET5368

Course Title: Advanced AC Machines

School: 130T Engineering (TAFE)

Campus: City Campus

Program: C5005 - Diploma of Electrical

Course Contact : Leon Mattatia

Course Contact Phone: 9925 4668

Course Contact Email:leon.mattatia@rmit.edu.au


Name and Contact Details of All Other Relevant Staff

Andrew Kim
Location: City, 57.5.20
Telephone: 9925 4295
Fax: 9925 8099
Email: andrew.kim@rmit.edu.au

Nominal Hours: 80

Regardless of the mode of delivery, represent a guide to the relative teaching time and student effort required to successfully achieve a particular competency/module. This may include not only scheduled classes or workplace visits but also the amount of effort required to undertake, evaluate and complete all assessment requirements, including any non-classroom activities.

Pre-requisites and Co-requisites

The following modules (or equivalents) should be preferably completed prior to, or in conjunction with, this module:
 EA140 Power Systems Analysis

Course Description

To analyze the operational environment to allow the appropriate selection of a motor and starting system including the analysis of the performance of common AC machines, (including starting and braking).


National Codes, Titles, Elements and Performance Criteria

National Element Code & Title:

EB110 Advanced AC Machines


Learning Outcomes


On completion of this module the learner will be able to:

1. Outline the basic operating principles of three phase induction motor operation and determine winding details, synchronous speed, rotor frequency, torque, speed, air gap power and rotor impedance.
2. Perform the necessary tests to determine the approximate equivalent circuit values of a three phase induction motor, predict the motor performance by calculation and confirm the predictions by measurements.
3. Outline the factors influencing the selection of three phase induction motor starters and braking circuits.
4. Outline the basic operating principles of three phase synchronous motors, perform the necessary tests to determine the equivalent circuit values, predict the motor performance by calculation and confirm the predictions by measurements.
5. Outline the factors influencing the selection of three phase synchronous motor starters and braking circuits.
6. Outline the basic operating principles of single phase induction motors, perform the necessary tests to determine the equivalent circuit values, and predict the motor performance by calculation.
7. Describe the construction, operation and application of the various types of fractional kilowatt motors.
8. Estimate the acceleration time of a given motor/load combination.
9. Estimate the size of a motor subjected to a cyclic loading using the RMS method.


Details of Learning Activities

Learning activities will include lectures, tutorials and laboratories. Lectures and tutotrials will be held in the same session, usually first half of the session will be lecture and second half will be tutorial.

From the lectures, tutorials and lab activities student will develop skills and understanding of:
• Basic operating principles of three phase induction motor operation.
• Determine the winding details, synchronous speed, rotor frequency, torque, speed, air gap power and rotor impedance.
• Determine the approximate equivalent circuit values of a three phase induction motor.
• Selection of three phase induction motor starters and braking circuits.
• Operating principles of three phase synchronous motors
• Selection of three phase synchronous motor starters and braking circuits.
• Operating principles of single phase induction motors.
• Estimate the acceleration time of a given motor/load combination
• Estimate the size of a motor subjected to a cyclic loading using the RMS method.

Participate in supervised workshop practice in real and/or simulated workplace environments involving selection, set-up and use of a range of test equipment to measure voltage, current and resistance. Demonstrate the appropriate choice of instruments, correct connections, correct instrument handling procedures and safe working practice.

Using workplace scenarios, participate in individual and team problem solving simulations/role plays/case studies dealing with:
• OHS procedures (including basic legal requirements; requirements for personal safety; working safely with electrical tools and equipment)
• Emergency first aid/basic life support including emergency first aid for an electric shock victim
• Rescuing from a live electrical situation
• Workshop practices in the selection, set-up and use a range of test equipment to measure voltage, current and resistance


Teaching Schedule

Week 1 Magnetic Quantities

Week 2 Magnetic Circuits

Week 3
Single phase induction motors
• Theory of operation and construction
• Counter rotating field theory and cross field theory.
• Optimum impedance of start winding or capacitor

Week 4
Single phase induction motors
• No-load and locked rotor test
• Motor parameters from the equivalent circuit values.
• Equivalent circuit component values from the no-load and locked rotor test.

Week 5
Single phase shaded pole, reluctance, hysteresis and universal motors.
• Construction, operation and application of the various types of fractional kilowatt motors.
Acceleration and deceleration time.
• Moment of inertia.
• Reflected inertia and torque through a gearbox.

Week 6
Acceleration and deceleration time.
• Time estimations given motor and load speed/torque characteristics
Cyclic Loading - RMS method
• Motor winding temperature.
• Forward and braking power.

Week 7
Cyclic Loading - RMS method
• Peak torque capability
• Estimation of motor rating when subjected to a cyclic varying load which could be subjected to: discreet power steps, linear power ramps, periods when the rotor is stationary.

Week 8
Three phase induction motor
• Basic construction, windings
• Rotating magnetic field from stationary coils
• EMF equation produced by a 3 phase stator winding and its significance

Week 9
Three phase induction motor
• Rotor impedance at a given value of slip given standstill values
• Rotor frequency

Week 10
Three phase induction motor
• Relationship between torque and speed for both small and large values of slip
• Slip for maximum torque.
• Losses

Week 11
Three phase induction motor
• Relationship between air-gap power, gross torque, and net torque
• Definition of torque: starting, pull-up, pull-in, breakdown, maximum, full-load, no-load

Week 12
Three phase induction motor
• Exact and approximate equivalent circuits and assumptions used.
• No-load test, locked rotor test and resistance tests

Week 13
Three phase induction motor
• Equivalent circuit component values from the no-load and locked rotor tests.

Week 14
• Motor performance parameters from the approximate equivalent circuit Week 1
Three phase induction motor
• Slip for maximum torque.
• Slip for maximum power output.
• Motor performance from: separation of losses test and load test.

Week 15
Three phase induction motor
• Supply authorities’ rules regarding direct on line starting.
• Performance of the reduced voltage motor starting techniques.

Week 16
Three phase induction motor
• Braking functions and methods, schematic diagrams.
• Comparison of star-delta, primary resistance, auto-transformers, electronic "soft-start", secondary resistance starters, schematic diagrams.
Three Phase Synchronous Motors
• Construction & operating Principles.
• Cylindrical and salient pole rotors.

Week 17
Final written test

Week 18
Feedback


Learning Resources

Prescribed Texts


References

Hubert, C.I. Electrical Machines, Merrill, 1991.

Richardson, D. & Caisse, A. Rotating Electric Machinery and Transformer Technology. (3Ed.)Prentice Hall, 1987.

Introductory Circuit Analysis, 10th Ed, Boylestad, Mc Millan


Other Resources


Overview of Assessment

- Project 
- Assignments throughout the course 
- End of course exam 


Assessment Tasks

1. Project - Build a motor (10%)
Students are to build a 3 volts motor. Two students to one motor.

2. Assignments (40%)
Each student will complete all assignments designed to reinforce the theory topics taught during the semester. The assignments will cover theory and calculation problems.

3 Final written test (60%)
Final test will cover all the course materials covered from Week 1 to Week 16.


Assessment Matrix

 Learning Outcome% of Assessment
ProjectBuild a motor10
Assignments1 to 1640
Examination1 to 1660

Course Overview: Access Course Overview