Electrical Machines and Drives

Lecturer:

Ivan Uhlíř (gar.), Jan Chyský (gar.), Jaroslav Novák, Lukáš Novák, Jiří Šťastný

Tutor:

Ivan Uhlíř (gar.), Jan Chyský (gar.), Zdenék Buřič, Miroslav Dvořák, Jaroslav Havlín, Daniela Kunzová, Jaroslav Novák, Lukáš Novák, Martin Novák, Jaroslav Páč, Stanislava Papežová, Ondřej Stanke, Jiří Šimánek, Jiří Šťastný, Josef Vlček, Jaromír Volf

Synopsis:

AC el. curcuits. Electrical power and energy. Calculation, measurement, power factor.

Magnetic circuit, materials, hysteresis loop. Electromagnet. Transformer, principle, construction, 3-phase transformer, operating conditions, rated (scheduled) values. Induction machine, principle, construction, operating conditions. Starting, speed-torque characteristic, speed control. Synchronous machines. DC-machines, principle, parameters, operating conditions, construction, starting, speed control, speed-torque characteristic. Low-voltage instruments.

Low-voltage distribution system.

Requirements:

Magnetic materials and Magnetic circuits. DC and AC electromagnets. 3-phase power measurement. Transformer, principle, theory, equivalent circuit, phasor diagram, instrument transformer design. Transformer: Open-circuit test, Short-circuit test; drop of voltage by loading. 3-phase transformer, hour angle. Special transformers. Asynchronous motor, principle, construction, operating parameters., 6.As. Motor - theory, equivalent circuit, losses - subdivision., 7.Speed-torque characteristic. Circle diagram. Single-phase as. motor, 8.Asynchronous motor - starting, speed control., 9.Synchronous machine, generator, motor, reluctance and stepper motors, 10.DC-machines, principle, theory, equivalent circuit, fundamental equations., 11.DC - separately excited; (- shunt; - series) motor, speed - torque characteristic, starting., 12.Ward-Leonard system, speed controlling of DC-motors,, Single-phase commutator motor., 13.Low-voltage instruments, fuses, breakers, residual current devices, 14.Low-voltage power network., # oc_a, 1.Group subdivision, repetition of safety work rules. Calculations:, 3-phase AC-circuits and 3-phase power. Measuring Instruments., 2.3-phase power measurement: 3 Wattmeter method; artificial connections - 1 W-method, 2 W- (Aron) method; reactive power and power factor; non-harmonic waveforms measurement., 3.Magnetic circuits measurement, electromagnet characteristic measurement, magnetic circuit calculation., 4.Power semiconductors, steady-state characteristics, cooling. Cooling calculation and verification., 5.1-phase transformer: Open-circuit test, Short-circuit test; loading

Syllabus of lectures:

1. Calculation of AC circuits using SKM (Phasors) methode. 3-phase power calculation and measurement.

2. Magnetic materials and Magnetic circuits.

DC and AC electromagnets.

3.Transformer, principle, theory, equivalent circuit, phasor diagram, instrument transformer design.

4.Transformer: Open-circuit test, Short-circuit test; drop of voltage by loading. 3-phase transformer, hour angle. Special transformers.

5.Asynchronous motor, principle, construction, operating parameters.

6.As. Motor - theory, equivalent circuit, losses - subdivision.

7.Speed-torque characteristic. Circle diagram. Single-phase as. motor

8.Asynchronous motor - starting, speed control.

9.Synchronous machine, generator, motor, reluctance and stepper motors

10.DC-machines, principle, theory, equivalent circuit, fundamental equations.

11.DC - separately excited; (- shunt; - series) motor, speed - torque characteristic, starting.

12.Ward-Leonard system, speed controlling of DC-motors,

Single-phase commutator motor.

13.Low-voltage instruments, fuses, breakers, residual current devices

14.Low-voltage power network.

Syllabus of tutorials:

1.Group subdivision, repetition of safety work rules. Calculations:

3-phase AC-circuits and 3-phase power. Measuring Instruments.

2.3-phase power measurement: 3 Wattmeter method; artificial connections - 1 W-method, 2 W- (Aron) method; reactive power and power factor; non-harmonic waveforms measurement.

3.Magnetic circuits measurement, electromagnet characteristic measurement, magnetic circuit calculation.

4.Power semiconductors, steady-state characteristics, cooling. Cooling calculation and verification.

5.1-phase transformer: Open-circuit test, Short-circuit test; loading characteristic. Examples, transformer design. Movie: Transformers production.

6.Asynchronous motor, terminals box, stator resistors measurement. No-load test, Locked-rotor test. Movie: As. Motors production.

7.As. Motor - frequency and voltage control; single phase power supply. Examples of As. Motor-drives.

8.As. Motor (Single phase, 3-phase) - loading test. Circle diagram. Examples Performance of As. Motor-drives.

9.Contactors automation. // Synchronous machine - No-load test, Short-circuit test, Synchronising.

10. Waveforms of characteristic quantities in the chopper connection with DC-motor (duty factor dependence). Examples Performance of DC machine - drives.

11. Control characteristics of DC-motor (No-load test), V-A characteristic of DC - motor-operated (and generator-operated) state. Magnetic neutral plane setting. Movie: DC-machines.

12. Contactors automation. // Synchronous machine - No-load test, Short-circuit test, Synchronising.

13. DC-machines - loading test, speed-torque characteristics of

DC -separately excited.(-series) motor. AC-commutator motor measurement.

14. Assessment.

Study Objective:

Obtained knowledge of electrical machines and drives which is necessary for mechanical engineers.

Study materials:

Chapman Stephen J., Electric Machinery Fundamentals, McGraw-Hill Publishing Company, 1985, ISBN 0-07-010662-2

Note:

Further information:

http://elektro.fs.cvut.cz

No time-table has been prepared for this course

The course is a part of the following study plans: