Electromechanical Converters

Lecturer:

Tutor:

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 characteristics. Generators and motors

3. Starting and braking of motors. Common DC machine characteristics, commutation principles

4. Transformers, principles and design, main characteristics. Three-phase transformer winding accouplement

5. Main work states, parallel operation. AC rotating electromechanical converters, rotating magnetic field

6. Induction machines, principles, use, characteristics. 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. Switching overvoltage in AC circuits. Small inductive current- and capacitive current switching

14. Environment influence to the switching process

Syllabus of tutorials:

1. Introduce to labs, security laws, laboratory rule

2. Adjustable sources and their control

3. Contactor combinations

4. Independent excited motor - load characteristics

5. Independent- and parallel excited dynamo - load characteristics

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

7. Three-phase transformer winding accouplement, parallel operation

8. Induction motor - starting, mechanical characteristics

9. Synchronous generator - synchronizing with the network, operation on the network

10. Overcurrent relais, switching characteristics

11. AC contactor power characteristics

12. V - C characteristics of contactors

13. Contactor overheating measurement

14. Reparation measurements, credit

Study Objective:

Study materials:

Chapman,S.J.: Electric Machinery Fundamentals McGraw-Hill, U.S.A., 1985

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans:

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