ELECTRICAL MACHINE-I (Ist PPT) Unit-1.pptx

The Electrotechnics Application (Transformers), "AEL-AI13-D", is a basic application which has been designed by EDIBON to introduce the students in the basic concepts about how three-phase and single-phase transformers work.Transformers are used...The Fault Simulation Application in Three Phase Transformers, "AEL-ESAT", has been designed by EDIBON to simulate non-destructive faults in three-phase transformers and application of diagnostic and localization techniques.This application allows...

1. AMIT KUMAR PANDEY 1 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM) Topic Name : Introduction of Electrical Machines

2. Introduction of Electrical Machines :- An electrical machine is a device which converts mechanical energy into electrical energy or vice versa. Electrical machines also include transformers, which do not actually make conversion between mechanical and electrical form but they convert AC current from one voltage level to another voltage level. AMIT KUMAR PANDEY 2 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

3. Importance of Electrical Machines :- Electricity is generated by electrical generators. Electricity is one of the most important blessings that science has given to mankind. It has also become a part of modern life and one cannot think of a world without it. Electricity has many uses in our day to day life. It is used for lighting rooms, working fans and domestic appliances like using electric stoves, A/C and more. All these provide comfort to people. In factories, large machines are worked with the help of electricity. Essential items like food, cloth, paper and many other things are the product of electricity. AMIT KUMAR PANDEY 3 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

4. Importance of Electrical Machines :- Electric motors impact almost every aspect of modern living. Refrigerators, vacuum cleaners, air conditioners, fans, computer hard drives, automatic car windows, and multitudes of other appliances and devices all use electric motors to convert electrical energy into useful mechanical energy. AMIT KUMAR PANDEY 4 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

5. Classification of Electrical Machines :- 1.DC Machine 1.1 DC Generator 1.2 DC Motor 2.Transformer 2.1 Single Phase Transformer 2.2 Three Phase Transformer 3.Induction Motor 3.1 Three Phase Induction Motor 3.2 Single Phase Induction Motor 4. Synchronous Machine 4.1 Synchronous Generator or Alternator 4.2 Synchronous Motor 5.Special Motors AMIT KUMAR PANDEY 5 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

6. DC Machine :- A DC Machine is an electro-mechanical energy conversion device. ... The AC motor is invariably applied in the industry for conversion of electrical power into mechanical power, but at the places where the wide range of speeds and good speed regulation is required, like in electric traction system, a DC motor is used. AMIT KUMAR PANDEY 6 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

7. DC Generator :- A  dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf . They are used for general lighting. They are used to charge battery because they can be made to give constant output voltage. They are used for giving the excitation to the alternators. They are also used for small power supply (such as a portable generator ). AMIT KUMAR PANDEY 7 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

8. DC Motor :- A direct current or DC motor, converts electrical energy into mechanical energy. It is one of two basic types of motors: the other type is the alternating current or AC motor. Among DC motors, there are shunt-wound, series-wound, compound-wound and permanent magnet  motor. Small  DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills AMIT KUMAR PANDEY 8 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

9. Transformer :- A  transformer is defined as a passive electrical device that transfers electrical energy from one circuit to another through the process of electromagnetic induction. It is most commonly used to increase ('step up') or decrease ('step down') voltage levels between circuits. A  transformer is a device that is used to either raise or lower voltages and currents in an electrical circuit. In modern electrical distribution systems, transformers are used to boost voltage levels so as to decrease line losses during transmission. AMIT KUMAR PANDEY 9 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

10. Single Phase Transformer :- The single-phase transformers are widely used in commercial low voltage application as electronic devices. They operate as a step-down voltage transformer and decrease the home voltage value to the value suitable for electronics supplying AMIT KUMAR PANDEY 10 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

11. Three Phase Transformer :- Three Phase transformers are widely used as power transformers, Distribution transformers and in Electrical Grids. ... Some loads such as industrial, and commercial require 3 phase transformers to meet their demand. The transmission voltage such as 132/220 KV, we need step up/down in the both ends of Transmission lines. AMIT KUMAR PANDEY 11 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

12. Induction Motor :- Definition  of induction motor. : an alternating current motor in which torque is produced by the reaction between a varying magnetic field generated in the stator and the current induced in the coils of the rotor. AMIT KUMAR PANDEY 12 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

13. Three Phase Induction Motor :- 3 phase induction motor is singly excited  a.c machine which is connected to 3 phase supply.in this motor stator is directly connected to supply and rotor get excited by means of induction(unlike in case of dc motor) while rotor never catch the speed of stator (synchronous speed ). Three-phase  AC induction motors are widely used in industrial and commercial applications. These are of two types, squirrel cage and slip ring motors. Squirrel cage motors are widely used due to their rugged construction and simple design. Slip ring motors require external resistors to have high starting torque. AMIT KUMAR PANDEY 13 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

14. Single Phase Induction Motor :- A  Single Phase Induction Motor consists of a single phase winding which is mounted on the stator of the motor and a cage winding placed on the rotor. A pulsating magnetic field is produced, when the stator winding of the single-phase induction motor shown below is energised by a single phase  supply. Single Phase Induction Motor. ... The single phase motors are simple in construction, cheap in cost, reliable and easy to repair and maintain. Due to all these advantages, the single phase motor finds its application in vacuum cleaners, fans, washing machines, centrifugal pumps, blowers, washing machines, etc. AMIT KUMAR PANDEY 14 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

15. Synchronous Machine :- A  synchronous machine is an electrical machine whose rotating speed is proportional to the frequency of the alternating current supply and independent of the load. AMIT KUMAR PANDEY 15 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

16. Synchronous Generator or Alternator :- A machine that generates an alternating voltage when its armature or field is rotated by a motor, an engine, or other means. The output frequency is exactly proportional to the speed at which the generator is driven. Synchronous generators are commonly used for variable speed wind turbine applications, due to their low rotational synchronous speeds that produce the voltage at grid frequency. ... Using an AVR for the excitation of the field voltage, the output voltage of the synchronous generator can be controlled. AMIT KUMAR PANDEY 16 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

17. Synchronous Motor :- A  synchronous electric motor is an AC motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles. ... The synchronous motor and induction motor are the most widely used types of AC  motor. U sually , synchronous motors are used for applications where precise and constant speed is required. Low power applications of these motors include positioning machines. These are also applied in robot actuators. Ball mills, clocks, record player turntables also make use of synchronous motors. AMIT KUMAR PANDEY 17 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

18. Special Motors :- AC Series motors Universal motor Stepper motor Shaded pole motor AMIT KUMAR PANDEY 18 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

19. Syllabus of Electrical Machine-I :- Magnetic fields and magnetic circuits Electromagnetic force and torque DC machines DC machine - motoring and generation Transformers AMIT KUMAR PANDEY 19 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)

20. Outcome :- The ability to formulate and then analyse the working of any electrical machine using mathematical model under loaded and unloaded conditions. The skill to analyse the response of any electrical machine. The ability to troubleshoot the operation of an electrical machine. The ability to select a suitable measuring instrument for a given application. The ability to estimate and correct deviations in measurements due to the influence of the instrument and due to the accuracy of the instrument. AMIT KUMAR PANDEY 20 GLOBAL INSTITUTE OF TECHNOLGY JAIPUR ELECTRICAL MACHINE-I (3EE4-07) ELECTRICAL ENGG. (III SEM)