In this course, students will understand the basic principles of electric–mechanical energy conversion for all widely applied electric machinery and apparatus such as motors and generators.
The study of electric machinery and apparatus has been a significant electrical subject since the days of Edison and Tesla, and is still significant due to its close relationship with subjects of note in recent years such as the global warming issue and hybrid automobiles.
By the end of this course, students will be able to understand the principles and basic structures of DC machines, AC machines, transformers, and reactors, and calculate the basic characteristics of actual instruments.
DC machine, induction machine, synchronous machine, permanent magnet machine, motor, generator, transformer, reactor, electro-mechanical energy conversion
|✔ Specialist skills||Intercultural skills||Communication skills||Critical thinking skills||✔ Practical and/or problem-solving skills|
Classes in this course consist of an outline of the day's lecture, an explanation of circulated materials, the day's quiz and solutions, an explanation of the previous lecture's homework, a lecture, a video showing the inside of electric machinery and apparatus, the results of the previous lecture's questionnaire and a summary of the day's class, a questionnaire, and an explanation of the day's homework.
|Course schedule||Required learning|
|Class 1||Electrical apparatus overview, applications, materials, flux and voltage, MMF, reluctance, magnetizing current, inductance||Inductance and magnetizing current can be calculated and magnetic circuit can be analyzed.|
|Class 2||Structure of transformers, equivalent circuit and leakage inductance, resistance, iron loss resistance, magnetizing current, simplified equivalent circuit||Equivalent circuit of transformers can be explained|
|Class 3||Transformer voltage variation, percentage reactance, loss and efficiency, three-phase system, line-to-line voltage||Voltage, current, efficiency and etc. of transformers can be calculated.|
|Class 4||Reactor, capacitance, magnetic energy, reactor variation, flux linkage and current curves, magnet attractive force, VA, saturable reactor||Variations of reactor and simple design procedure can be understood.|
|Class 5||Magnetic energy and electromagnetic force, linear actuator, magnetic energy, reluctance torque, SR motor, 2 winding||Principles of reluctance motor and current relationship can be understood.|
|Class 6||Fundamental 1 in electric machine, Fleming’s law, coil in magnetic field, armature and brush, principle of dc motor||DC motor structure can be drawn and principle can be presented.|
|Class 7||Fundamental 2 in electric machine, dc brushless motor, 3-phase system, rotating magnetic field, 2-pole and 4-pole, 3-phase synchronous machine principle||Synchronous machine structure can be drawn and principle can be presented.|
|Class 8||Check point (area, A3 handwriting memo, simple calculator, writing gear, ID), reactor, transformer, reluctance machine, dc machine, synchronous machine, induction machine||Fundamentals of various electrical apparatus can be understood.|
|Class 9||Fundamental 3 in electric machine, operating principles of a 3-phase induction machine, basic structure of windings, energy flow and efficiency||Structure of induction machine can be drawn and principles can be presented.|
|Class 10||DC motor with commutators 1, structure and fundamental of dc motor, excitation methods, excitation methods, basic structure of windings.||Structure of dc machine with commutators can be drawn and principles can be presented.|
|Class 11||DC motor with commutators 2, emf and torque, equivalent circuits, characteristics of dc motor and generator, universal motor||EMF and torque of a dc machine can be introduced. Characteristics of dc motor and generator can be presented.|
|Class 12||Synchronous machine 1, structure of synchronous machines, synchronous impedance, equivalent circuit, armature reaction, output power||Synchronous impedance can be introduced. Equivalent circuit can be presented.|
|Class 13||Synchronous machine 2, short-circuit ratio, parallel operation, excitation methods, characteristics of synchronous motors, V curve, maximum torque control, start-up methods||Characteristics of synchronous motor and generator can be presented.|
|Class 14||Induction motor 1, overview and structure, breakdown of loss, difference between induction machines and dc machines, equivalent circuits, measurement of parameters||Characteristics and equivalent circuit of induction machine can be presented.|
|Class 15||Induction motor 2, characteristics of induction machines with constant voltage and frequency, variable-speed operation of induction machines, three-phase induction generators||Characteristics of induction motors based on equivalent circuit can be presented.|
Text book: Fukao Tadashi "Electrica apparatus and power electronics", IEEJ university lecture Ohm sha (in Japanese) (ISBN: 9784886862860)
Reference: Miyairi Shota "latest elecrical apparatus", university lecture series, Maruzen (in Japanese) (ISBN: 978-4621080894)
Checkpoint, Midterm exam 35%, Final exam 35%，activity 30%
Understanding Electromagnetism and linear circuits is necessary.
This lecture takes internet cloud service Handbook for e-learning and ICT device application, as well as active learning. Quiz, simple exams, home work, questionnaire will be provided through the cloud service. Please bring internet connection devices.