2020 Electromagnetic Actuators

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Academic unit or major
Undergraduate major in Systems and Control Engineering
Fujita Hideaki 
Course component(s)
Mode of instruction
Day/Period(Room No.)
Mon1-2(H114)  Thr1-2(H114)  
Course number
Academic year
Offered quarter
Syllabus updated
Lecture notes updated
Language used
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Course description and aims

 The aim of this course is to study fundamental principle and basic characteristics of various electromagnetic actuators utilizing electromagnetic force, such as rotating electric motors, linear motors, electromagnets, and so on. This course presents applications and major roles of various actuators, structure and principle of dc motors, fundamental of inductors, electromagnets, transformers, induction motors, synchronous motors, permanent magnet synchronous motors, brush-less dc motors, and step motors.
Nowadays, almost all the mechanical equipment is driven by

Student learning outcomes

The aim of this course is to have the following ability:
1) To explain structure, operating principle, and fundamental characteristics of fundamental electromagnetic actuators.
2) To calculate the fundamental characteristics of fundamental electromagnetic actuators.
3) To explain practical installation and control scheme of fundamental electromagnetic actuators.
4) To calculate the fundamental control performance of fundamental electromagnetic actuators.
5) To select a suitable electromagnetic actuator according to the requirements and characteristics of the driven plant.


Electromagnetic force, magnetic energy, control performance, dc motors, induction motors, electromagnets, step motors, transformers, inductors.

Competencies that will be developed

Specialist skills Intercultural skills Communication skills Critical thinking skills Practical and/or problem-solving skills

Class flow

Each class will first present principle, control methods, and analysis methods. And then, students will have discussion and make presentation on
the assigned topic in the class.

Course schedule/Required learning

  Course schedule Required learning
Class 1 Applications and roles of electromagnetic actuators Various actuators, electromagnetic actuators, and their applications. Report of electromagnetic actuators found around us.
Class 2 Structure and principle of dc motors Pole pairs, torque, induced electromotive force, losses and power flow. Discussion on the relation between performance improvement and structure in dc motors.
Class 3 Characteristics of dc motors Winding connections, relation between torque and rotating speed, its transfer function. Discussion on the types and applications of dc motors.
Class 4 Fundamental of magnetic circuits Magnetic field and flux, inductance, magnetic materials, magnetic equivalent circuit, magnetic energy. Review of magnetic circuits
Class 5 Fundamental of inductors Structure of inductors, losses in inductors, frequency responses. Design of a simple inductor.
Class 6 Electromagnets Principle of electromagnets, dc and ac excitation, structure and performance. Design of a simple electromagnet.
Class 7 Transformer Structure, ideal transformers, practical transformers, characteristics. Design of a simple transformer.
Class 8 Fundamental principle of ac motors Rotating magnetic field, electromotive force, principle of torque generation. Discussion on the method to induce a rotating magnetic field.
Class 9 Fundamental of induction motors Structure, equivalent circuits, fundamental characteristics. Discussion on relation between the circuit parameters and characteristics.
Class 10 Control methods for induction motors Feedforward control, slip-frequency control, field oriented control. Discussion on the control method and its implementation of induction motors.
Class 11 Fundamental of synchronous motors Structure, equivalent circuits, fundamental characteristics. Considerations of the relation between operating conditions and performance of synchronous motors. .
Class 12 Transient analysis of synchronous motors Transient equivalent circuits, transient response, basic control methods. Discussion on the control method and stability improvement of synchronous motors.
Class 13 Permanent magnet synchronous motors Property of permanent magnets, structures and reluctance torque, control methods. Calculation of characteristic plot for the maximum torque control method.
Class 14 Brush-less dc motors and step motors Structure of brush-less dc motors, control performance, step motors and their characteristics. Discussion on the selection of a suitable type of the motor according to its application.


The lecture documents will be distributed through OCW/i.

Reference books, course materials, etc.

References are written in Japanese.

Assessment criteria and methods

Grading depends on the reports in each class (50%) and final report (50%).

Related courses

  • SCE.E201 : Basic Theory of Electric Circuit
  • SCE.C202 : Feedback Control
  • LAS.P103 : Fundamentals of Electromagnetism 1

Prerequisites (i.e., required knowledge, skills, courses, etc.)

Students in department of electric and electronic engineering can not take this course.
Student who has completed "electric machinery" can not take this course.
It is better to complete "Fundamentals of Electromagnetism" in physics, "Basic Theory of Electric Circuit," "Feedback Control" before taking this class.

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