Electromechanical Energy Conversion

Rules

Class Roster

Points

Class Notes

Questions

What do we do when we are finished with the draft and ready to publish?

• If it's been approved by the reviewers, move it to the articles section

Does anybody know of a way to put a box around text or math equations? Would I just have to create a 1x1 table?

Announcements

If anyone wants to write the derivation of Ampere's Law you can put it on my (Wesley Brown) Ampere's Law page and be a co-author.

Article Suggestions

(Please mark these when you complete the article.)

1. Rewrite the notes for the wiki. (Really, this will help get ready for the exam. The professor who did them is the one who is writing the exam questions.) Click here for the Class Notes.

• Effects of the Non-Linear B-H Curve

1. Draw and explain the effect of the non-linear B-H curve on current waveforms for a voltage excited inductor. (This is mostly done in the notes.)
2. Explain how to measure the B-H curve experimentally.
3. If the B-H curve was traced out more quickly in the experiment above, would the curve look different? If so why?
4. Show how to calculate the core losses of a nonlinear inductor using its i-v curve.

• Transformers

1. Explore transformers with more than one secondary winding.
   • What is the input impedance of an idea transformer with two secondaries, one with N2 turns and one with N₃ turns, each with a different load resistor on attached.
   • How do the mutual impedances relate to the turns ratios in transformers with more than one secondary?
   • Develop a circuit model for a non-ideal transformer with multiple secondaries.
2. Develop the theory of autotransformers.
3. Explore how leakage flux affects the inductance of an inductor. What if that flux is then recovered and the effect accounted for by mutual inductance? Does the result agree with the simple calculation of inductance without leakage?
4. Describe the coupling factor, k, used in Spice simulators and other circuit simulators. Relate it to the leakage, magnetizing, and mutual inductances.
5. Derive the $Y/\Delta$ transformations.
6. Explore the voltage regulation $(V_{full~load}-V_{no~load}) \over {V_{full~load}}$x 100% as a function of the power factor angle on the load of a transformer. (You will note some surprising results in some cases.)
7. Describe the open circuit and short circuit test as applied to transformers.
8. Explore how much flux is in the core of a loaded ideal transformer.

• Three Phase Circuits

1. Calculate and compare how much power can be delivered with three phase circuits as compared to a single phase circuits. Assume that the same amount of copper is available for the wire of both systems.

And if you don't understand any of the above, please come see the teacher!

Draft Articles

These articles are not ready for reading and error checking. They are listed so people will not simultaneously write about similar topics.

• Ferromagnetism
• Magnetic Circuits
• Example: Ampere's Law (Tyler Anderson)
• Ampere's Law
• DC Motor
• Fringing
• Electrostatics
• Faraday's Law
• Eddy Current
• Example Problems of Magnetic Circuits
• Ohm's Law and Reluctance
• Magnetic Flux

• Example: Ideal Transformer Exercise (John Hawkins)
• Reference Terms and Units (Amy Crosby)
• Example: Ideal Transformer
• Problem Set 1(Jodi Hodge)
• ANOTHER IDEAL TRANSFORMER!!!!!!!!!
• Example: Magnetic Field (Amy Crosby)
• Example: Metal Cart (Amy Crosby)
• Class Notes(Tyler Anderson)
• The Class Notes (Kirk Betz)
• Transformer Example Problem (Aric Vyhmeister, Kevin Starkey, Nick Christman)

Reviewed Articles

These articles have been reviewed and submitted.

• Gauss Meters (Tyler Anderson)
• Magnetostatics (Nick Christman)
• Magnetic Flux (Jason Osborne)
• An Application of Electromechanical Energy Conversion: Hybrid Electric Vehicles (Chris Lau)
• An Ideal Transformer Example (Chris Lau)
• Magnetic Circuit (John Hawkins)
• AC Motors
• Example Problem - Toroid (Kirk Betz)
• Ideal Transformer Example (Tim Rasmussen)
• AC vs. DC (Wesley Brown)