Electrical Machinery for Electric Engineering of Sustanable Systems

Major: Sustainable Energy Systems
Code of subject: 6.141.09.O.049
Credits: 6.00
Department: Electromechatronics and Computerized Electromechanical Systems
Lecturer: Associate Professor, Doctor of Technical Sciences Makarchuk Oleksandr Volodymyrovych, Associate Professor, Doctor of Technical Sciences Haj Michajlo Vasilovych
Semester: 4 семестр
Mode of study: денна
Learning outcomes: • understand the principle of operation and structure of different types of electrical machines and transformers; • be able to demonstrate in-depth knowledge of physical phenomena in electrical machines and transformers in different modes of operation and make their mathematical description; • be able to demonstrate knowledge of the basic characteristics of electrical machines and transformers. • be able to apply the knowledge gained from electrical machines and transformers in practice and have research skills; • be able to solve problems posed by electric machines and transformers and make appropriate decisions; • have the potential for further study of electrical machines and transformers.
Required prior and related subjects: • Theoretical foundations of electrical engineering • Electrical materials • Theoretical mechanics • Physics • Higher mathematics
Summary of the subject: Terms Electric machines are energy converters. The main types of electric machines, their role and importance in modern technology and energy. Purpose, subject and tasks of studying the discipline "Electric machines and equipment of electric power systems of sustainable development". The principle of reversibility of electric machines. Electromagnetic relations during energy conversion. Materials used in electrical engineering. Transformers Definition and main types of transformers. The main structural elements of the transformer. The principle of operation of the transformer. Modern designs of three-phase transformers to ensure electromagnetic compatibility. Equation of a transformer with a ferromagnetic core. Reduction of transformer windings to one number of turns. Substitute circuit of the transformer. Identification of transformer parameters. Non-operating stroke and short circuit of the transformer. Transformer voltage change. Loss and return ratio of the transformer. Three-phase transformers. Circuits and groups of connections of three-phase two-winding transformers. General questions of the theory of alternating current machines Classification and general characteristics of AC machines. The main design elements and the principle of operation of AC machines. Electromotive force (EMF) of the armature winding of an alternating current machine. Magnetomotive force (MRS) of a single-phase armature winding. Pulsating magnetic field. MRS three-phase winding. Rotating magnetic field. Properties of the third harmonic of the MRS three-phase winding. Asynchronous machines The principle of operation of an asynchronous machine. Purpose and role of the asynchronous machine in the national economy. Types of asynchronous machines. The main modes of operation of a three-phase asynchronous machine. The main structural elements of a three-phase induction motor. Phenomena in an induction motor with a fixed rotor and when the rotor rotates under load. Basic equations of an induction motor. Reduction of the rotor of an asynchronous machine to its stator. Equation of the combined induction motor. Alternate circuit and vector diagram of an induction motor. Non-working stroke and short circuit experiment of induction motor. Power diagram of an induction motor. Electromagnetic moment of an induction motor. Performance characteristics of an induction motor. Starting induction motors. Adjusting the speed of induction motors by changing the slip (applied voltage and the introduction of resistance in the phase of the phase rotor), changing the number of pole pairs and the frequency of the supply voltage. Synchronous machines The principle of operation of a synchronous machine. Basic definitions and types of synchronous machines. Brief description of the main structural elements of turbogenerators and hydrogenerators. Synchronous generators with permanent magnets for wind energy. The reaction of the armature in a synchronous generator at active, inductive and capacitive loads. The reaction of the anchor under mixed load. The reaction of the armature in a single-phase synchronous machine. Characteristics of synchronous generators. Short circuit ratio. Determination of stator winding parameters by characteristics. Voltage regulation of synchronous generators by changing the excitation or torque of the turbine. Parallel operation of synchronous generators and load distribution. Conditions for switching on synchronous generators for parallel operation. Switching on by the method of self-synchronization. Electromagnetic and synchronizing power of the generator. Overload capacity of synchronous generator. The concept of static and dynamic stability. Angular and U are similar characteristics. Synchronous motors. Design features of a synchronous motor. Electromagnetic power, synchronizing power and motor overload capacity. U - similar characteristics. Synchronous motor performance. Losses and efficiency of synchronous machines. Asynchronous start of synchronous motors. Synchronous motors with permanent magnets. DC machines The main design elements of DC machines. The principle of operation of DC machines. Magnetic field in the air gap of the machine during idle. The magnetization curve of the machine. Electromotive force (EMF) and electromagnetic moment. The magnetic field of the machine under load. The reaction of the armature in the generator. Transverse and longitudinal magnetomotive force (MRS) of the armature. The reaction of the armature in the engine. The demagnetizing force of the armature transverse reaction. Switching. DC generators. DC motors. Machines with permanent magnets.
Assessment methods and criteria: • written reports on laboratory works, oral questioning (30%) • final control (control measure - exam): written form (70%)
Recommended books: 1. Vol`dek A.Y`., Popov V.V. Эlektry`chesky`e mashy`nы. Vvedeny`e v эlektromexany`ku. Mashy`nы postoyannogo toka y` transformatorы. Uchebny`k dlya vuzov. — SPb: Py`ter, 2008. — 320 s.: y`l. (in Russian) 2. Vol`dek A.Y`., Popov V.V. Эlektry`chesky`e mashy`nы. Mashy`nы peremennogo toka. Uchebny`k dlya vuzov. — SPb.: Py`ter, 2008. — 350 s.: y`l. (in Russian) 3. Pyrhonen J. та ін. Design Process of Rotating Electrical Machines. Design of Rotating Electrical Machines / J. Pyrhonen, T. Jokinen, V. Hrabovcova, John Wiley & Sons, Ltd. 2008. –512 с. 4. Byelikova L.Ya., Shevchenko V.P. Elektry`chni mashy`ny`: Navchal`ny`j posibny`k. — Odesa: Nauka i Texnika, 2011. — 480 s. (in Russian) 5. Yaczun M.A. Elektry`chni mashy`ny`: Navchal`ny`j posibny`k. – L`viv: Vy`davny`cztvo L`vivs`koyi politexniky`, 2011. – 464 s. (in Ukrainian)