Fall 2015 -- ECEN 3170 -- Energy Conversion 1

The study of AC and DC Electrical Motors and Generators


Last Revisions on 6/24/2015

On occasion this page maybe updated or enhanced.


Did you know that

the electrical machine in a power generation plant

is fundamentally no different than

an electrical vehicle motor?


Did you know that after completing two years

of an electrical engineering curriculum,

you have gained enough fundamental knowledge

to study the specifics of both of them?


Do you like fast cars? How about fast motorcycles?

Do you like fast-green cars? How about fast-green motorcycles?


Did I just not hear a Tesla go by?

A ZERO motorcycle sounds like . nothing ..

The LiveWire is so quiet, Harley gave it a unique sound.


The moral:

Could the future automotive engineer

be an electrical engineer?


This course covers pre-requisite material for

Adjustable AC Drives ECEN 4167/5737

(Electrical Drives for Electrical Vehicles)




Course Overview


  1. Read/study during the first week a Circuits 2 Review handout.
  2. Brief review of phasors
  3. Balanced three-phase circuits
    1. Wye and delta connections
  4. Introduction to machinery principles
    1. Rotational motion Newtons Law

b.       Forces/torques of electric machines

    1. The magnetic field
    2. Faradays Law
    3. Lorentz Force Law
    4. Real and reactive power in single phase circuits, power triangle
  1. Transformers
    1. Single and three-phase
    2. Equivalent circuits
    3. Per-unit systems of measurement

6.       AC-machinery fundamentals

a.       A simple rotating loop in a uniform magnetic field

b.       Rotating magnetic field

                                                               i.      The ingenious concept of a three-phase distributed winding energized by a three phase power supply creates a rotating magnetic field

c.        Induced torque in an AC machine

d.       Power flows and losses

  1. Synchronous generator from a magnetic field point of view
    1. Equivalent circuit
    2. Phasor diagram
    3. Power-flow
    4. Stability, transients
    5. Operating alone
    6. Operating on an infinite bus
    7. House diagram
  2. Synchronous motors and condensers
    1. Starting, stability
    2. Use the damper windings as introduction to induction motors
  3. Three-phase induction motors
    1. Equivalent circuit
    2. Torque-speed curves derived from a magnetic field point of view
    3. Torque-speed curves derived from the equivalent circuit point of view
    4. NEMA A, B, C, D designs
    5. Power-flow
    6. Starting in-rush
  4. DC machinery fundamentals
    1. Internal generated voltage and torque
    2. Commutation
    3. Power-flow
    4. DC motors

                                                               i.      Separately excited,

                                                              ii.      Series excited

                                                            iii.      Shunt excited

                                                            iv.      Compound excited

                                                             v.      Torque curves

  1. If time permits:
    1. Single phase motors

                                                               i.      Universal motors

                                                              ii.      Two-phase motors

                                                            iii.      Split-phase start, capacitor start, permanent-split capacitor start, capacitor-start/run

  1. We will use Matlab and Simulink
  2. Every day course details will be on D2L.


REQUIRED Course Material

  1. Text book: Stephen J. Chapman, Electric Machinery Fundamentals, 5th Edition, McGraw Hill, ISBN-13:978-0-07-352954-7.
    1. Older editions are NOT acceptable.
  2. Student version of Matlab/Simulink


The 120 time shift

combined with

the 120 spatial shift

produces a

Rotating Magnetic Field

The (4) equations of motion in

real world format


The MathWorks





Course Vitals

      Instructor: Harry Hilgers

hhhilgers@mesanetworks.net Office: OT 352

Regular office hours: TBD

      Teaching Assistant

  Joshua Woodward Joshua.Woodward@Colorado.EDU

  Office: OT 352

  Regular office hours: Tu/Th -- TBD

      Lecture material

  There is only enough class time to lecture just the core points.

  So it stands to reason that you read the material before coming to lecture and study it thoroughly afterwards.

  I will predominantly lecture with ppt charts from the text book.

  I will have some hardware in the form of motors that should help with visualization

      During Lectures

  I encourage asking questions. The only dumb question is the one not asked.

  If a question is not enough on point or the answer becomes too time consuming, I may suggest holding off until office hours.

      In class-quizzes

  One to three unannounced in-class per week

  To allow for unexpected missed attendance I will drop the three lowest grades

  I will contact the distance-learning students as to how these quizzes will be handled.

      Homework Assignments

  One HW assignment per week.

  You will scan your HW and drop it into the drop box on D2L prior to the due date/time.

  Late HW receives zero credit.


  Three in-class mid-term exams

  An in-class final exam

  I will contact the distance-learning students as to how these exams will be handled.

      The final grade is computed as follows:

  Each of three midterm exams: 15%

  Final exam: 25%

  HW: 15% (I will drop the lowest grade)

  Quizzes: 15% (I will drop the three lowest grades)


  This will be on D2L.

  It will be used for HW assignments, announcements, calendar, exam dates, etc.

      Some final comments

  I recognize that the amount of material is very large.

  Therefore by necessity some material will only be covered on the surface.

  It is impossible for you to become an expert at it in a short semester.

  So it is my goal to introduce the material to a level so that later, when you need to apply it, you will have enough background and will not be afraid to open a book and study the different aspects in detail.

  The demand for Energy Conversion Engineers is on the increase; especially in the power generation industry and in the electrical vehicle industry.

  I want to make sure that with this course you have enough fundamentals that you can make a good impression when going to a job interview in the Energy Conversion world.

  Very often the Energy Conversion Industry as well as Electrical Consulting Industry requires Engineers that have a PE License.

  I urge you to look into this.

      Last but for sure not least

  If you qualify for accommodations because of a disability, please submit to me a letter from Disability Services in a timely manner so that your needs may be addressed.

  Disability Services determines accommodations based on documented disabilities. (303-492-8671, Willard 322)

  Every effort will be made to reasonably and fairly deal with students who have serious religious observances that conflict with scheduled exams, assignments, etc.

  Please notify me well in advance, so that there is time to make adequate arrangements.

  The Boulder campus policy can be read at http://www.colorado.edu/policies/fac_relig.html

  All students will be expected to comply with the Boulder campus honor code.

  This honor code can be viewed at http://www.colorado.edu/academics/honorcode/

  Students and faculty each have responsibility for maintaining an appropriate learning environment.

  Those who fail to adhere to such behavioral standards may be subject to discipline.

  Professional courtesy and sensitivity are especially important with respect to individuals and topics dealing with differences of race, culture, religion, politics, sexual orientation, gender, gender variance, and nationalities.

  The campus policy can be read at http://www.colorado.edu/policies/classbehavior.html