Course detail

Electrical Machines

FEKT-BPA-ESBAcad. year: 2022/2023

The basic laws and equations used in the theory of electrical machines. Magnetic circuits of electrical machines. The basic voltage equations, equivalent circuit diagrams, phasor diagrams, the basic electrical connections of electrical machines. Energy and power flow diagrams, losses and efficiency. Torque equation. Electrical machines performance. Nonsymmetrical loading. Basic characteristics of electrical machines.

Language of instruction

English

Number of ECTS credits

6

Mode of study

Not applicable.

Guarantor

doc. Ing. Ondřej Vítek, Ph.D.

Department

Department of Power Electrical and Electronic Engineering (UVEE)

Offered to foreign students

The home faculty only

Learning outcomes of the course unit

Subject graduate should be able to
- describe main parts of electric machines,
- know classes of insulation and electrical machines costruction,
- describe construction of transformer,
- explain transformer losses,
- explain single and multiphase transformer operation,
- calculate parameters of transformer equivalent circuit from no-load and short – circuit tests,
- draw and explain phasor diagrams of transformer at no load, at short circuit and generally loaded.
- transformer winding connection and phasor diagram for different hour angle,
- explain and calculate transformer voltage regulation,
- describe and explain construction and principle of operation of induction machine with wound rotor and with squirrel cage,
- describe revolving magnetic field generation,
- define basic kinds of AC machine windings,
- sketch curve of magnetic field of AC winding distributed in more slots,
- draw equivalent induction machine circuit diagram, derive torque equation and draw torque - speed characteristic ,
- describe connection of induction motor into public utility network and speed control,
- describe construction and principle of operation of single phase induction motor,
- describe principle operation and construction of nonsalient synchronous machine,
- draw simplified circuit diagram, derive torque equation and draw phasor diagram,
- explain synchronous generator operation with isolated load and with public utility network, use phasor diagram for explanation,
- explain synchronous compensator principle of operation,
- describe DC machine construction and principle of operation,
- describe basic types of DC machine windings,
- derive torque and induced voltage equations,
- explain properties of DC motors and generators,
- describe construction and explain principle of operation of AC single phase commutator machines.

Prerequisites

Student should be able to
- explain and define basic terms electromagnetic field, electric field, magnetic field, circuits with lumped and distributed parameters,
- solve DC, AC and magnetic circuits,
- solve three phase AC circuits,
- define the terms work and energy,
- describe and explain basic properties soft and hard magnetic materials.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

Assesment methods and criteria linked to learning outcomes

Control tests - 20 points
Exercises and Laboratory exercises - 10 points
Final Exam - 70 points

Course curriculum

1. Introduction, motivation, repetition of the basics of magnetism and solving magnetic circuits.
2. Transformers. Ideal transformer, real transformer, basic equations.
3. Principle of operation and design of power transformers.
4. Three-phase transformers, winding connection, parallel operation.
5. Magnetic circuit and windings of rotating electrical machines. Principle of operation of asynchronous machine, generation of rotating field.
6. Equivalent circuit, basic equations and moment characteristics.
7. Starting three-phase asynchronous motors from the mains, speed control.
8. Single-phase asynchronous motor. Three-phase asynchronous motor on single-phase network.
9. Synchronous machine. Principle of operation, design.
10. Theory of non-salient pole machine. Torque characteristics, synchronous machine operating into independent load and in parallel with the network.
11. Synchronous machines with salient poles and permanent magnets.
12. DC machines. Principle of operation and design, derivation of basic equations.
13. Operating characteristics of DC machines in steady state. 

Work placements

Not applicable.

Aims

To acquaint the students with the principle of operation and performance of transformers, induction machines, DC machines and synchronous machines. The theoretical knowledge are proved in laboratory excerscises.

Specification of controlled education, way of implementation and compensation for absences

The content and forms of instruction in the evaluated course are specified by a regulation issued by the lecturer responsible for the course and updated for every academic year.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

FITZGERALD, A.E., KINGSLEY, Charles, UMANS, Stephen D. Electric Machinery. 6th edition. McGraw-Hill, 2002. 704 p. ISBN 978-0073660097. (EN)

Recommended reading

Not applicable.

eLearning

eLearning: currently opened course

Classification of course in study plans

  • Programme BPA-ELE Bachelor's

    specialization BPA-PSA , 2. year of study, summer semester, compulsory

Type of course unit

 

Lecture

39 hours, optionally

Teacher / Lecturer

doc. Ing. Jan Bárta, Ph.D.

Syllabus


1. Introduction and motivation
    Magnetism - repetition and solving magnetic circuits.
2. Transformer - design, working principle and ideal transformer.
3. Transformer - Real transformer, substitution scheme, basic equations.
4. Transformer - Three phase transformers, winding connection and parallel operation.
5. Torque production, generation of spinning magnetic field and windings of AC electrical machines.
6. Asynchronous machine - Design, principle of operation, alternate circuit.
7. Asynchronous machine - phasor diagram and operating characteristics.
8. Asynchronous machine - starting three-phase asynchronous motors from the mains, speed control and single-phase asynchronous machines.
    Synchronous machine - Principle of operation, design, phasor diagrams.
9. Synchronous machine - Theory of smooth rotor machine. Moment characteristics, synchronous machine operating into independent load and in parallel with the grid.
10. Synchronous machine - Synchronous machines with salient poles and permanent magnets.
11. DC machine - Principle of operation and design, derivation of basic equations.
12. DC machine - Operating characteristics of DC machines in steady state.
13. Electric machines in electrification of transport - Overview of modern trends.  

 

Fundamentals seminar

8 hours, compulsory

Teacher / Lecturer

Vitaliy Sizonenko

Syllabus

      Week - description

      2.  N1 - Magnetic circuits.
      3.  N2 - Transformers.
      5.  KT1 - Magnetic circuits and transformers.
      6.  N3 - Torque production, magnetic field torque generation and windings of AC electrical machines.
      7.  N4 - Asynchronous machine.
      10. N5 - Synchronous machine.
      11. KT2 - Asynchronous and synchronous machines.


      Where: N - numerical exercise, KT - control test.
       

       

      Laboratory exercise

      18 hours, compulsory

      Teacher / Lecturer

      Vitaliy Sizonenko

      Syllabus

          Week - description

          1. Principles of safety at work in the laboratory. Familiarization with the laboratory - practice wiring.

          4.  L1 - Transformers: replacement parameters, loading and transformer efficiency.
          8.  L2 - Asynchronous motor - torque characteristics.
          9.  L3 - Asynchronous motor - distribution of losses and calculation of parameters of the replacement scheme.
          12. L4 - DC machine.
          13. Spare laboratory 


          Where: L - laboratory exercise
           

           

          eLearning

          eLearning: currently opened course