Course detail

AC drives

FEKT-NSPOAcad. year: 2015/2016

Controlled drives with an induction motor: frequency response of a controlled induction motor, static characteristics of a scalar and vector control, synthesis of a speed control loop. Controlled drives with a synchronous motor, sratic characteristics of a vector control, structures of controlled circuits, supply of motors from a voltage or current source. Subsynchronous and oversynchronous cascade, static characteristics, synthesis of controllers.

Learning outcomes of the course unit

Passed student the course is able to
- describe and explain way and condition of variables description using space vectors in AC electric machines
- explain Clark and Park transform and their meaning. To define significant coordination frames
- explain how power and torque is computed using space vectors
- describe and explain induction machine dynamic model and its transformation in to various coordinate systems
- describe and explain synchronous machine model. Modify it for various variants of synchronous machine.
- describe and explain common method of scalar control of induction machine
- describe and explain common method of field oriented control of induction machine
- describe and explain common method of field oriented control of synchronous machine
- describe three-phase transistor inverter model. Define its inputs and outputs gain and transfer function.

In laboratory exercises is validated to:
- realize dynamic models of AC machines
- realize dynamic models of control methods of ac machines
- determine transfer functions of controlled systems for particular control methods


Student which enter the course should be able to - apply Laplace transform - apply complex numbers - apply principles of integral and derivation computation - explain physical and electrical principles related to electromechanical energy transformation - apply continuous control theory - realize models in MATLAB – SIMULINK environment


Not applicable.

Recommended optional programme components

Not applicable.

Recommended or required reading

Caha, Černý: Elektrické pohony, SNTL (CS)
Leonhard: Control of Electrical Drives, Springer (EN)
Bose: Power Electronics and Variable Frequency Drives, IEEE Press (EN)

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

Requirements for completion of a course are specified by a regulation issued by the lecturer responsible for the course and updated for every. Evaluated are two credit projects and oral exam with writen preliminary

Language of instruction


Work placements

Not applicable.

Course curriculum

Space vector, Park and Clark transform
Three-phase machines dynamic models fundamentals, parameters of models
Asynchronous machine model
Synchronous machines model
Threephase transistor inverter model, Methods of PWM
Scalar control methods of induction drive
Field oriented control methods of induction drive
Direct torque control of induction drive
Field oriented control methods of synchronous drive
Sensorless control introduction
Induction machine applications with feeding into rotor


To acquaint students with theory of AC controlled drives

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

Computer laboratory is compulsory

Classification of course in study plans

  • Programme EEKR-MN Master's

    branch MN-SVE , 2. year of study, winter semester, 6 credits, compulsory

Type of course unit



39 hours, optionally

Teacher / Lecturer

Exercise in computer lab

18 hours, compulsory

Teacher / Lecturer

Laboratory exercise

8 hours, optionally

Teacher / Lecturer