Course detail
Electrical Servodrives
FSI-RES Acad. year: 2021/2022 Winter semester
1.) Transistor drives with DC motor – the aim is to repeat and consolidate the skills acquired in previous bachelor's courses. Definition of frequency responses of DC motor, inverter and all necessary sensors, synthesis of current and speed control loops.
2.) Simplified EC motor design – Explanation of the simplified procedure for EC motor design, with regard to the possibilities of the semiconductor converter, dimensioning of the converter and a description of its control structure with an overview of the possibilities of its implementation.
3.) Control of drives with EC motors and harmonic PMSM – Description of the design of the synchronous machine with respect to the method of its supply (EC motor / harmonic machine), overview of variants of control algorithms for harmonic machines, methods of speed and position control loops synthesis.
4.) Drives with asynchronous machines – calculation of static characteristics from the substitution scheme, scalar and vector speed control.
5.) Converters for of three-phase machines, types of DC link, active rectifiers – possibilities of realization of converters for three-phase machines, explanation of converters with voltage and current DC link, converter subsystems.
6.) Traction drives with asynchronous motors, specifics of low voltage drives – Example of design of low voltage drive with asynchronous motor, explanation of control algorithm for traction purposes optimized in terms of efficiency.
7.) Drives with thyristor controlled rectifiers, four quadrant connections – Description of connections of all common types of controlled rectifiers with an overview of their common industrial applications. Explanation of the term power stage and control circuits for thyristor controlled rectifiers.
8.) Traction drive with DC machine, combined speed control by armature voltage and excitation – Explanation of the function of combined control with special emphasis on traction applications, synthesis of control loops
9.) Usage of ultracapacitors in electric traction – Description of the possibilities of ultracapacitors with a demonstration of the application of a capacitor bank in the traction system, explanation of control and regulation circuits for ultracapacitors systems.
10.) Position control of servo drives, position and speed sensors in electric drives – Synthesis of speed and position loops of electric drive, description of sensors used in drives.
11.) Drives with switched reluctance motor – Explanation of the principle of reluctance motor, specifics of its use, question of choice of phase number, converters for SRM, control algorithms for SRM.
12.) Stepper motors based drives – overview of all used types of stepper motors, explanation of their control methods, converters for stepper motors, industrial applications of stepper motors.
13.) Interference in high-current electrical equipment – Explanation of the term electromagnetic compatibility, the mechanism of parasitic interference in power electronics equipment, recommendations for the design of interference-resistant equipment.
Supervisor
Learning outcomes of the course unit
Students are able to:
- draw diagrams of the power parts of the thyristor rectifiers and explain in which quadrants are able to operate.
- create mathematical model of the thyristor rectifier and defined requirement on optimal current regulator.
- explain principle of the velocity control of the asynchronous motor, to draw equivalent electrical model and torque characteristic of the asynchronous motor.
- to draw block diagram and explain principle of scalar velocity control of the asynchronous motor.
- describe design techniques of the permanent magnet synchronous motor (PMSM).
- draw block diagram and explain principle of vector control of the PMSM
- explain principle of the switched reluctance motor, to describe its features and to draw block diagram of the regulation structure.
- describe all kinds of fault events in electrical systems and to design techniques which are reducing these effects.
Prerequisites
Prerequisit – Student has to be able to:
- apply differential equations for description of the electromechanical system in time and Laplace domain
- describe motor principle according to their electrical diagram.
- design cascade control structure
- handle the software tool Matlab/Simulink
- prove that he is qualified to handle with electrical equipment according to defined rules.
Planned learning activities and teaching methods
The course is taught through lectures explaining the basic principles and theory of the discipline. Exercises are focused on practical topics presented in lectures.
Assesment methods and criteria linked to learning outcomes
The course is evaluated on the basis of a written exam, which contains a theoretical and computational part.
The theoretical part is evaluated 50 points and the calculation part 50 points.
Language of instruction
Czech
Aims
The aim of the course is to acquaint students with principles and applications of various types of electric drives, design methods and applications of drives with DC machines, induction machines, BLDC motors, synchronous machines with permanent magnets, switched reluctance and stepper motors. Another important goal is to get acquainted with the specific technical difficulties related to the design and implementation of electric drives.
Specification of controlled education, way of implementation and compensation for absences
Mandatory numeric and computer exercises, absence can be compensated by homework.
The study programmes with the given course
Programme N-MET-P: Mechatronics, Master's
branch ---: no specialisation, 7 credits, compulsory
Type of course unit
Lecture
26 hours, optionally
Teacher / Lecturer
Syllabus
1. Electric drives with DC motor – the aim is to repeat and consolidate the skills gained in the previous bachelor courses, frequency response of the DC motor, response of the inverter, response of all necessary sensors, synthesis of current ans speed loops.
2. Simplified BLDC machine design. Explanation of simplified procedure its design, considering the possibilities of a semiconductor converter, dimensioning of the inverter and description of its control structure with an overview of the possibilities of its implementation
3. Drives with BLDC and harmonic synchronous machine with permanent magnets on the rotor. Description of the design of a synchronous machine with respect to its power supply (BLDC / harmonic machine), overview of control algorithm variants for harmonic machines, description of synthesis of speed and position control loops.
4. Drives with thyristor rectifiers. Description of the diagram of all common types of controlled rectifiers with an overview of their industrial applications. Explanation of control circuits for thyristor controlled rectifiers
5. Traction drive with DC machine. Explanation of its control with special emphasis on traction applications, synthesis of control loops.
6. Converters for three-phase machines, types of DC links, active rectifiers. Explanation of possibilities of realization of inverters for three-phase machines, explanation of converter with voltage and current DC links.
7. Traction drives with induction machines, specifics of low voltage drives. Example of low-voltage drive design with induction machine, explanation of the control algorithm for traction purposes.
8. Usage of ultra-capacitors in electric traction. Description of ultracapacitor capabilities with demonstration of condenser battery application in traction system, explanation of control circuits for ultra-capacitor converters.
9. Position control of servo drives, speed and position sensors in electric drives. Synthesis of the speed and position loop of the electric drive, description of the sensors used in the drives.
10. Drives with switched reluctance motor. Explanation of reluctance motor principle, specifics of its usage, question of choice of number of phases, SRM converters, control algorithms for SRM,
11. Stepper motors. Overview of all types of stepper, explanation of its control, their industrial applications.
12. Electromagnetic interference in power electronic equipment, explanation of electromagnetic compatibility, mechanism of parasitic interference in power electronics structures, recommendations for design of interference-resistant devices.
Exercise
13 hours, compulsory
Teacher / Lecturer
Syllabus
1. Electric drives with DC motor – the aim is to repeat and consolidate the skills gained in the previous bachelor courses, frequency response of the DC motor, response of the inverter, response of all necessary sensors, synthesis of current ans speed loops.
2. Simplified BLDC machine design. Explanation of simplified procedure its design, considering the possibilities of a semiconductor converter, dimensioning of the inverter and description of its control structure with an overview of the possibilities of its implementation
3. Drives with BLDC and harmonic synchronous machine with permanent magnets on the rotor. Description of the design of a synchronous machine with respect to its power supply (BLDC / harmonic machine), overview of control algorithm variants for harmonic machines, description of synthesis of speed and position control loops.
4. Drives with thyristor rectifiers. Description of the diagram of all common types of controlled rectifiers with an overview of their industrial applications. Explanation of control circuits for thyristor controlled rectifiers
5. Traction drive with DC machine. Explanation of its control with special emphasis on traction applications, synthesis of control loops.
6. Converters for three-phase machines, types of DC links, active rectifiers. Explanation of possibilities of realization of inverters for three-phase machines, explanation of converter with voltage and current DC links.
7. Traction drives with induction machines, specifics of low voltage drives. Example of low-voltage drive design with induction machine, explanation of the control algorithm for traction purposes.
8. Usage of ultra-capacitors in electric traction. Description of ultracapacitor capabilities with demonstration of condenser battery application in traction system, explanation of control circuits for ultra-capacitor converters.
9. Position control of servo drives, speed and position sensors in electric drives. Synthesis of the speed and position loop of the electric drive, description of the sensors used in the drives.
10. Drives with switched reluctance motor. Explanation of reluctance motor principle, specifics of its usage, question of choice of number of phases, SRM converters, control algorithms for SRM,
11. Stepper motors. Overview of all types of stepper, explanation of its control, their industrial applications.
12. Electromagnetic interference in power electronic equipment, explanation of electromagnetic compatibility, mechanism of parasitic interference in power electronics structures, recommendations for design of interference-resistant devices.