Electromechanical Converters

Lecturer:

Petr Voženílek (gar.)

Tutor:

Petr Voženílek (gar.)

Supervisor:

Department of Electric Drives and Traction

Synopsis:

Electric drive, its components. Electromechanical Energy Conversion. Rotational converters - DC machines, induction motors, synchronous generators and motors. Special electric machines, actuators. Non-rotational converters - transformers. There are traversed work principles, main constructional scheme and characteristics, use scopes. Switching theory. Interaction between turn-off switch and switched circuit. Basic theory and characteristic of electric arc. Transient recovery voltage. Switching overvoltage.

Requirements:

Credit conditions: Attendance by the study laws, activity by the exercise solution, right worked and checked measurement transactions. Defence of the semestral project.

Syllabus of lectures:

1.Electric drives and their components. Electromechanical energy conversion. Electrotechnical laws application

2.DC machines, principles, design, main motor characteristics. Starting and braking

3.Common DC machine characteristics. Transformers, principles and design, main characteristics

4.Main transformer work states. Three-phase transformer winding accouplement, parallel operation

5.Rotating magnetic field, rotating AC machines, Induction machines, principles

6.Characteristics and use of induction motors. Single-phase induction motor

7.Energetic electric machines. Synchronous generators, principles, constructional design

8.Autonomous work and co-operation with the network. Synchronous motor. Special machines and actuators

9.Introduction in switching problematics. Switch operation. Switching arc in circuit breakers

10.DC current interrupting, switching overvoltage

11.AC current interrupting. Influence of an arc voltage. Breaked current deformation

12.Transient recovery voltage. Influence of its form on the switching process

13.Apparatus for protection against overcurrents and short-circuits in low voltage networks - basic operational principles, characteristics

14.Protection apparatus against electric shock, protection apparatus against overvoltage in low voltage networks

Syllabus of tutorials:

1.Introduce to labs, security laws, laboratory rule, steerable sources and their control

2.DC motor startup and reversation, speed control, tachdynamo calibration

3.Separately excited motor - load characteristics

4.Separately excited motor - speed control

5.Transformer - no load and short circuit operation measurement, standby circuit

6.Induction motor - starting, mechanical characteristics

7.Semi-automated measurement on the induction machine

8.Synchronous generator - synchronizing and operation on the network

9.Contactor logic control of electric machine - contactor combinations

10.Programmable relay - basic applications and operating

11.Programmable relay - applications and PC communication

12.Over-current relay, switching characteristics

13.AC contactor voltage-current characteristics

14.Contactor current - path overheating measurement, reparation measurements, assesment

Study Objective:

Study materials:

1. Chapman, S.J.: Electric Machinery Fundamentals; Mc-Graw-Hill in Electrical Engineering, U.S.A.,1985

2. Flurscheim, C.H., Power Circuit Breaker, Theory and Design. IEE.1982

Note:

Time-table for winter semester 2011/2012:

Time-table is not available yet

Time-table for summer semester 2011/2012:

Time-table is not available yet

The course is a part of the following study plans:

• Heavy-current Engineering- structured studies (compulsory course)
• Softwarové inženýrství (elective specialized course)
• Web a multimedia (elective specialized course)
• Manažerská informatika (elective specialized course)
• Inteligentní systémy (elective specialized course)