Course Title: Solve problems in electromagnetic circuits

Part B: Course Detail

Teaching Period: Term2 2009

Course Code: EEET6784C

Course Title: Solve problems in electromagnetic circuits

School: 130T Engineering (TAFE)

Campus: City Campus

Program: C6085 - Advanced Diploma of Electrical - Technology

Course Contact : Program Manager

Course Contact Phone: +61 3 9925 4468

Course Contact Email:engineering-tafe@rmit.edu.au


Name and Contact Details of All Other Relevant Staff

Abhijit Date 

Phone: 9925 4468

abhijit.date@rmit.edu.au 

Nominal Hours: 60

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

UEENEEE004A Solve problems in multiple path d.c. circuits

Course Description

This learning unit introduces the principle of electromagnetism, and its applications. It covers essential knowledge and procedures for determining correct operation of electromagnetic circuits and providing solutions as they apply to electrical installations and equipment.
It encompasses working safely, power circuit problems solving processes, including the use of voltage, current and resistance measuring devices, providing solutions derived from measurements and calculations to predictable problems in multiple path circuit.


National Codes, Titles, Elements and Performance Criteria

National Element Code & Title:

UEENEEG001B Solve problems in electromagnetic circuits

Element:

1. Prepare to work on Electromagnetic circuits
2. Solve multiple path electrical circuit problems.
3. Complete work and document problem solving activities.

Performance Criteria:

Students are expected to meet following performance requirements of the competency UEENEEG001 Solve problems in electromagnetic circuits:

1 1.1 OHS procedures for a given work area are identified, obtained and understood.
1.2 OHS risk control work preparation measures and procedures are followed.
1.3 The nature of the circuit(s) problem is obtained from documentation or from work supervisor to establish the scope of work to be undertaken.
1.4 Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.
1.5 Sources of materials that may be required for the work are established in accordance with established procedures.
1.6 Tools, equipment and testing devices needed to carry out the work are obtained and checked for correct operation and safety.


2 2.1 OHS risk control work measures and procedures are followed.
2.2 The need to test or measure live is determined in strict accordance with OHS requirements and when necessary conducted within established safety procedures.
2.3 Circuits are checked as being isolated where necessary in strict accordance OHS requirements and procedures.
2.4 Established methods are used to solving circuit problems from measure and calculated values as they apply to multiple path electrical circuit.
2.5 Unexpected situations are dealt with safely and with the approval of an authorised person.
2.6 Problems are solved without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.



3 3.1 OHS work completion risk control measures and procedures are followed.
3.2 Work site is cleaned and made safe in accordance with established procedures.
3.3 Justification for solutions used to solve circuit problems is documented.
3.4 Work completion is documented and an appropriate person or persons notified in accordance with established procedures.


Learning Outcomes



Details of Learning Activities

This unit covers determining correct operation of electromagnetic circuits and providing solutions as they apply to electrical installations and equipment. It encompasses working safely, power circuit problems solving processes, including the use of voltage, current and resistance measuring devices, providing solutions derived from measurements and calculations to predictable problems in multiple path circuit.

Classroom tutorial activities: to consolidate the concepts of electromagnetism, and electromagnetic applications. This includes calculations for electromagnetic quantities, voltage generation, motor torque, efficiency and power calculation.

Following topics will be covered: magnetism, electromagnetism, magnetic units, magnetization curve, electromagnetic induction, Inductance, Electromagnetic applications, relays, contactors, rotating machines, generators, motors, DC series, shunt and compound motors, motor loads, speed torque characteristics,

Practical exercises: to demonstrate an understanding topics related electromagnetic quantities, inductors, transients and transformers

Work simulated activities: to construct of DC motor control starting, reversing and braking circuits.


It is expected that students will require approximately 20% of course hours to be allocated for independent study to do project research, design, construction, testing and problem solving activities.

Content:
a) Magnetism encompassing:
• field patterns around given permanent magnets.
• magnetic induction and its effects.
• principles of magnetic shielding and its application.
• Classification of magnetic materials.
• typical applications of permanent magnets.
b) Electromagnetism encompassing:
• magnetic field patterns around a straight current carrying conductor and a solenoid.
• direction in which the magnetic field around a straight current carrying conductor.
• direction of the north pole of a solenoid.
• factors effecting the force and direction between adjacent current-carrying
conductors.
c) Magnetic quantities encompassing:
• magnetic terms and units for magnetomotive force, reluctance, magnetic flux, magnetising force and flux density.
• property of permeability and the meaning of actual and relative permeability.
• values of magnetomotive force, magnetising force, flux density, permeability and reluctance in given magnetic circuits.
d) Magnetisation curve encompassing:
• the terms “saturation”, “hysteresis” and “losses’ in relation to magnetic materials and circuits.
• magnetic characteristics of various materials from magnetisation curves, permeability curves and hysteresis loops.
• magnetic losses and the resulting effects on the performance of electrical machines.
e) Electromagnetic induction encompassing:
• factors required to induce an emf in a conductor.
• Faraday’s Law.
• direction of induced voltage in a moving conductor in a magnetic field.
• relationship between the forces acting on a closed conductor when an emf is induced in it. (Lenz’s law).
f) Inductance and inductors encompassing:
• factors affecting inductance and how the unit of inductance is derived.
• inductance of a solenoid given necessary physical data.
• value of induced voltage in a given circuit.
• growth/decay of current in an inductor and determine the time constant of a series L-R circuit.
g) Application of electromagnetic principles encompassing:
• principles of operation and applications of magnetism, electromagnetism and induction.
• hazards associated with induced voltages.
• situations where the effects of inductance and electromagnetism has an adverse effect.
h) Transformers construction and operating principles encompassing:
•Transformer ratio
• Autotransformers
•Transformer impedance and percentage impedance
• Losses and efficiency
• Current and instrument transformers
i) Rotating machine construction and operating principles encompassing:
• main components of a rotating machine.
• voltage generated and back emf induced in the “armature” conductors of a machine.
• motor effect produced by an electric current, including the development of torque in a motor and opposing torque in a generator.
• induced voltage in a conductors, force on a conductor and torque of various machines.
j) Generators encompassing:
• circuit arrangement and connection of various types of generators.
k) Machines encompassing:
• circuit arrangements and connections of various common motors.
• performance of motors from measured values.
• effects of load on a motor.
l) DC motors construction and operating principles encompassing:
DC series, shunt and compound motors, motor loads, speed torque characteristics, motor circuit arrangements
• Motor torque and speed calculations
• Starting, reversing and breaking of DC motors
m) Specialty machines encompassing:
• tachogenerator – construction, operation and applications.
• servomotors – construction, operation and applications.
• stepper motors – construction, operation and applications.
• EC motors – construction, operation and applications.


Teaching Schedule

 

Week 1.   Introduction to course, course guide, assessment, topics breakdown, resources, OHS issues, Magnetism,
Week 2.  Magnetic quantities
Week 3.  Electromagnetic induction, Faraday Law, Lenz’s law,
Week 4.  Generators, Inductors, time constant
Week 5.  Transformers
Week 6.  Solving problems in electromagnetic circuits
Week 7.  Electromagnetic Circuits                                                                  Task1: written assessment  35%
Week 8. DC Generator and Motor circuit arrangements
Week 9. DC Motors,
Week 10.  DC motor speed torque characteristics
Week 11.  Universal Motor, Contactors , Direct on Line Starting              Task 2a practical assessment 5 %
Week 12. Reversing DC Motors                                                                      Task 2b practical assessment 7 %
Week 13. Electric Motor Parameters, Speed control  Torque calculations
Week 14. DC motor braking                                                                             Task 2c  practical assessment 8 %
Week 15. Tachogenerators, Stepper motors, Servomotors
Week 16. Solving problems in electromagnetic circuits
Week 17. Electromagnetics                                                                              Task 3: written assessment  35%
Week 18. Assessment feedback, catch-up test, laboratory work catch-up. 


Learning Resources

Prescribed Texts

Marko Dumovic, "Electromagnetism" RMIT 2009


References

Boylestad, “Introductory circuit analysis”

Tutorial and Laboratory Instruction sheets will be available online (using RMIT Online Learning Hub) and student’s local S drive.


Other Resources

Tutorial and Laboratory Instruction sheets will be available online (using RMIT Online Learning Hub) and student’s local S drive:

S:/Marko/Electromagnetism


Overview of Assessment

This course will be assessed through a range of practical exercises, assignments and progressive tests.


Assessment Tasks

Assessment task 1 : 35%
Written assessment on:

   Magnetism, electromagnetism, magnetic units, magnetization Curve, electromagnetic induction, Inductance, Transformers
• Modifying an existing electromagnetic circuit to comply with specified operating parameters,
• Providing solutions to electromagnetic circuits involving inductors, transformers and generators.
• Determining the operating parameters of an existing electromagnetic circuit.
• Identifying control measures and applications to electrical devices, and machines at low voltage operation.

Assessment task 2: 20%
Practical assessment to demonstrate:
• The skills in using voltage, current and resistance measuring devices.
• The understanding of electromagnet practical application.
• The ability to modify electromagnetic circuit to comply with specified operating parameters.
• The ability to develop electromagnetic and DC motor control circuits to comply with a specified function and operating parameters

Assessment task 3 : 35%
Written assessment on:
-Solving electromagnetic circuit problems,
-Determining the operating parameters of an existing electromagnetic circuit,
-Determining correct operation of electromagnetic circuits,
- Providing solutions to dc Motor circuits and circuit arrangements.

Assessment Task 4: 10%

Class  participation and performance

When participating in class activities, students must demonstrate ability to:

o Organise and manage the tasks within the assignment requirements
o Perform tasks autonomously and/or as a member of a team as task proscribes
o Perform task and manage work environment/equipment according to safe working practice and OH&S requirements.
o Meet assessment criteria, conditions and technical requirement relevant to the competency standard detail above.


Assessment Matrix

 

 

                                                                                                                                                                                   Assessment type

Competency National Code                             Competency Title lab             Class exercises                      Test                  
UEENEEG001BSolve problems in electromagnetic circuits                                                                                                                         X
     

Other Information

The skills and knowledge described in this unit require a license to practice in the workplace where plant and equipment operate at voltage above 50 V a.c. or 120 V d.c.

This unit covers following Essential Knowledge & Associated Skills elements:

 2.8.6 Electromagnetic principles
2.11.1 Hand tools
2.18.1 Occupational health and safety principles
2.18.2 Electrical safe working practice

Course Overview: Access Course Overview