Electrical Engineering

After studying this course, you are required to have a basic understanding of the basic laws of magnetic circuits, the characteristics of commonly used ferromagnetic materials and the calculation of alternating current and tributary magnetic circuits; and have a basic understanding of transformers and three types of motors (DC motors, induction motors and synchronous motors). You must have a certain understanding of the basic structure; you must have an in-depth understanding of the main magnetic field and leakage magnetic field in the transformer, the properties and spatio-temporal relationship of the air gap magnetic field in the three types of motors; you must have an in-depth understanding of the operating principles of the transformer and the three types of motors during normal steady-state operation. , analysis methods and operating performance must be firmly mastered, be able to correctly establish voltage equations and torque equations, clarify energy conversion relationships, have a clear physical concept of steady-state parameters, and be able to skillfully use equivalent circuits and complex numbers to calculate symmetry Performance and operating data during steady-state operation; master the basic experimental methods and operating skills of the motor, such as the starting of the motor, the voltage build-up of the generator, the measurement methods of the main operating characteristics and steady-state parameters, etc., and be able to analyze the experimental results. analyze

• Chapter 1：Electrical and Mechanical Course Overview (40 minutes and 26 seconds)

• Chapter 2：Basic physical quantities in magnetic fields, concepts of magnetic circuits, and basic laws of magnetic circuits (49 minutes and 50 seconds)

• Chapter 3：Magnetic materials and their properties, simple magnetic circuit calculations (44 minutes and 0 seconds)

• Chapter 4：Excitation current and magnetic flux in AC magnetic circuit, and the law of electromagnetic induction (47 minutes and 5 seconds)

• Chapter 5：Transformer overview (42 minutes and 28 seconds)

• Chapter 6：No-load operation of transformer (49 minutes and 47 seconds)

• Chapter 7：Transformer load operation (53 minutes and 21 seconds)

• Chapter 8：Transformer Calculation (32 minutes and 54 seconds)

• Chapter 9：Equivalent circuit and phasor diagram of transformer (45 minutes and 54 seconds)

• Chapter 10：Transformer Parameter Measurement (45 minutes and 36 seconds)

• Chapter 11：Three-phase transformer group and three-phase core transformer (52 minutes and 59 seconds)

• Chapter 12：Three-phase transformer connection group (45 minutes and 38 seconds)

• Chapter 13：Waveforms of exciting current, main magnetic flux and induced electromotive force of three-phase transformer (45 minutes and 1 seconds)

• Chapter 14：Pu (47 minutes and 14 seconds)

• Chapter 15：Transformer voltage change rate and efficiency (49 minutes and 12 seconds)

• Chapter 16：Parallel operation of transformers (47 minutes and 0 seconds)

• Chapter 17：Autotransformer (44 minutes and 16 seconds)

• Chapter 18：Three-winding transformer, mutual inductor (39 minutes and 56 seconds)

• Chapter 19：Exercise lessons and tests (51 minutes and 25 seconds)

• Chapter 20：Overview of the working principles of synchronous generators and induction motors 1 (48 minutes and 44 seconds)

• Chapter 21：Overview of the working principles of synchronous generators and induction motors 2 (42 minutes and 56 seconds)

• Chapter 22：Three-phase single-layer winding (45 minutes and 33 seconds)

• Chapter 23：Three-phase double-layer winding (48 minutes and 27 seconds)

• Chapter 24：Star diagram of conductor emf, emf and coil emf (42 minutes and 27 seconds)

• Chapter 25：Coil group electromotive force, harmonic electromotive force (51 minutes and 28 seconds)

• Chapter 26：Methods to weaken harmonic electromotive force (46 minutes and 45 seconds)

• Chapter 27：Pulsating magnetomotive force of single-phase winding (49 minutes and 55 seconds)

• Chapter 28：Decomposition of the pulsating magnetic potential of a single-phase winding and the synthetic magnetomotive force of a three-phase winding - rotating magnetomotive force (1 hours and 1 minutes and 50 seconds)

• Chapter 29：Motor heating and temperature rise limit (43 minutes and 53 seconds)

• Chapter 30：Exercise lessons and tests (33 minutes and 23 seconds)

• Chapter 31：Operating status and structure of three-phase induction motor (50 minutes and 23 seconds)

• Chapter 32：Ratings, no-load operation of three-phase induction motors (43 minutes and 45 seconds)

• Chapter 33：Load operation of three-phase induction motor (39 minutes and 36 seconds)

• Chapter 34：Basic equations and equivalent circuit of three-phase induction motor (49 minutes and 15 seconds)

• Chapter 35：Phasor diagram of a three-phase induction motor - vector illustration (37 minutes and 22 seconds)

• Chapter 36：Power equation and torque equation of three-phase induction motor (46 minutes and 10 seconds)

• Chapter 37：Cage rotor parameters of three-phase induction motor (52 minutes and 48 seconds)

• Chapter 38：Parameter determination of three-phase induction motor (34 minutes and 53 seconds)

• Chapter 39：Torque - torque rate characteristics, mechanical characteristics (46 minutes and 30 seconds)

• Chapter 40：Operating Characteristics, Deep Groove and Double Cage Induction Motors (40 minutes and 54 seconds)

• Chapter 41：Speed ​​regulation of three-phase induction motor (44 minutes and 20 seconds)

• Chapter 42：Starting and braking of three-phase induction motors (42 minutes and 6 seconds)

• Chapter 43：Exercise lessons and tests (45 minutes and 59 seconds)

• Chapter 44：Basic structure of synchronous motor (44 minutes and 26 seconds)

• Chapter 45：The operating status, excitation method, model and rating of the synchronous generator (39 minutes and 8 seconds)

• Chapter 46：How a synchronous generator operates (46 minutes and 28 seconds)

• Chapter 47：Analysis method of hidden pole synchronous generator (44 minutes and 1 seconds)

• Chapter 48：Analysis method of salient pole synchronous generator 1 (40 minutes and 11 seconds)

• Chapter 49：Analysis method of salient pole synchronous generator 2 (48 minutes and 24 seconds)

• Chapter 50：Synchronous generator power and torque equations (48 minutes and 47 seconds)

• Chapter 51：Operating characteristics and reactance measurement of synchronous generators (41 minutes and 55 seconds)

• Chapter 52：Grid connection conditions and methods of synchronous generators (37 minutes and 44 seconds)

• Chapter 53：Electromagnetic power, power angle characteristics and power regulation of synchronous generators (53 minutes and 28 seconds)

• Chapter 54：Voltage equations and vector diagrams for synchronous motors (40 minutes and 52 seconds)

• Chapter 55：Power angle characteristics, V-shaped curve, starting and speed regulation of synchronous motors and synchronous compensation machines (47 minutes and 41 seconds)

• Chapter 56：Synchronous motor summary, exercises and tests (1 hours and 3 minutes and 28 seconds)

• Chapter 57：Principle and basic structure of DC motor (44 minutes and 34 seconds)

• Chapter 58：DC Motor Ratings, Windings, and Fields (42 minutes and 36 seconds)

• Chapter 59：Armature reaction of DC motor (39 minutes and 41 seconds)

• Chapter 60：Induced electromotive force and electromagnetic torque of DC motor (46 minutes and 20 seconds)

• Chapter 61：Basic electromagnetic relations of DC generators (49 minutes and 13 seconds)

• Chapter 62：Operating characteristics of separately excited DC generators, self-excitation and operating characteristics of shunt-excited DC generators (36 minutes and 20 seconds)

• Chapter 63：Basic electromagnetic relations and operating characteristics of DC motors (44 minutes and 57 seconds)

• Chapter 64：Starting and speed regulation of DC motors (45 minutes and 30 seconds)

• Chapter 65：Exercise lessons and tests (57 minutes and 22 seconds)