Course detail

# Electrical Drives

This new course link to courses of mechanic, theory of Electric machines and Power Electronics. Explain the principles and methods dimensioning of power parts structure of Electric drives. Electric drives play an important role as electromechanical energy converters in most production processes. Explain problems : Dynamics of a Mechanical Drive, Integration of the simplified Equation of Motion, Thermal effects in Electrical machines,structures with Separately Excited and Series DC machines, Control of Converter-supplied this type, Induction Motor + frequency converter,Variable Frequency Synchronous Motor Drives and Some Applications of Controlled Drives.

Language of instruction

Czech

Number of ECTS credits

5

Mode of study

Not applicable.

Learning outcomes of the course unit

Learning outcomes BEPB
Student:
- He is able describe mathematical background of the common torque – velocity characteristics of the drivetrain systems in dependence on absolute value of the velocity and also in dependence on operational quadrant.
- He can recalculate drivetrain inertia on the side of the motor shaft.
- He is able to create frequency characteristic from voltage and Newton´s second law equations. He is able to build a model of DC motor according to mentioned equations.
- He is able to draw and explain principles of all possible variations of the power parts of the DC/DC inverter intended for motor supply.
- He knows how to build mathematical models of the DC/DC inverters and all related sensors.
- He perfectly understands the principles of cascade regulation structure of the DC drivetrain and he is able to describe all inner loops.
- He can calculate current and velocity regulators for DC drivetrain according to specialized “Optimal module methods”.
- He knows how to calculate “bode characteristics” of the desired value and fault signal.
- He is able to describe principles of the drivetrain with asynchronous motors from user point of view. He is able to describe principle of velocity control of the asynchronous motor.
- He is able to draw power diagram of pules inerter for asynchronous motor. He is able to explain principles of scalar velocity control.
- He knows phenomena of the asynchronous motor de-excitations. He is able to explain areas of the constant torque and power of the motor.
- He is able to identified dissipations presented in electrical drivetrain. He is able to design the electrical drivetrain with help of methods assuming effective values of torques (currents) or average values of dissipations.
- He is able to choose suitable type of motor and inverter for typical industrial and traction applications.
Computer and laboratory lessons outcomes
- Student can create project in program Matlab/Simulink and he is able to handle its basic library functions and functional blocs.
- He is able to simulate Newton´s second law principles of the mechanical system
- He is able to create Simulink model of the DC motor with external field excitation of with permanent magnet.
- He is able to create Simulink model of current loop of the DC motor with inverter
- He is able to create model of the velocity closed loop with inner current loop.
- He is able to create simplified model of the position loop.
- According to simulations result of the electric drive operation cycle he is able to defined dissipation and design the main power parts of the drivetrain (motor + inverter) according to these dissipations.
- He is able to set the initialization procedure of the industrial servomechanism SIMENS Simotion
- He is able to realize current and velocity regulators (designed via “Optimal module methods”) via analog circuits (operational amplifiers).
- He is able to analyze dissipations presented in drivetrain with synchronous motor according to values measured with dynamometer.

Prerequisites

The subject knowledge on the secondary school level is required.
Student has to able to:
- explain general principles of the electric machines.
- compute in complex domain.
- apply differential equations of the electromechanical systems in time and Laplace domain.
- handle the software MATLAB SIMULINK on basic level
- prove that he is qualified to handle with electrical equipment according to defined rules.

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

Requirements for completion of a course are specified by a regulation issued by the lecturer responsible for the course and updated for every academic year.

Course curriculum

1. Block diagram of electric drive
2. Static torque speed characteristic of load.
3. Mechanics of electric drive, equation of motion
4. The main types of electric machines, used in electric drives
5. DC machine, matematic model
6. Transistor inverter as a dynamic element in control theory
7. Cascade control loops regulation of electric drives
8. SO, OM, transient characteristics, regulator design
9. Mechanic charakteristic of mechanism and industrial machines
10. Loses in drive, dimensioning, equivalent methods
11. Induction machine in electric drives
12. Regulating drives with asynchronous machines, frequency inverters, softstarts.
13. Drives with synchronous machines, EC motor.

Work placements

Not applicable.

Aims

New conception and essential information of Electric Drives
/ theoretical and practice /.

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

Caha, Z., Černý, M.: Elektrické pohony SNTL Praha, 1990 (CS)
Pavelka, J., Čeřovský, Z., Javůrek, J.: Elektrické pohony, skripta ČVUT Praha, 1996 (CS)
Patočka, M., Magnetické jevy a obvody ve výkonové elektronice, měřicí technice a silnoproudé elektrotechnice, VUTIUM Brno, 2011 (CS)

Not applicable.

Classification of course in study plans

• Programme BKC-SEE Bachelor's, 3. year of study, winter semester, compulsory

#### Type of course unit

Lecture

26 hours, optionally

Teacher / Lecturer

Syllabus

Essential terms, some elementary principles of mechanics and electrotechnics,requirements and qualit.
Dynamics of a Mechanical Drive,Equations describing the motion,stead state characteristics,stable and unstable points.
Electromechanical transient,moving of drives-4Q plane.
Powerlosses,thermal effect,dimensioning,equvalent methods.
Drives with Separately excited DC motor/permanent magnet/.
Drives with Series excited DC motor + chopper source.
Control of Inductiom motor drives + frequency inverter.
Control drives with Synchronous motor.
Drives with special type of rotation and linear motors.
Some applications of Controlled drives,Electrical shaft.
Control loops of current,speed,position.
Control drives with special type of motors.

Exercise in computer lab

26 hours, compulsory

Teacher / Lecturer

Syllabus

Measuring of moment of inertia, parameters of block diagram.
Speed,acceleration,torque of electric drives.
Electromechanical transients.
AC drives with frequency Inverters.
DC drive fed Control source.
Linear Position Control.
Switched Reluctance Drives.
Electric Drives with Special type of Motor - Electronic.
- " - - 1 phasemotor
- " - - synchronnmot
- " - - commutator
- " - - reluctanc
- " - - piezomotor