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# Electric machine

It is classification of electric machine

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### Electric machine

1. 1. Electric Machine From:- Ashok Soni BE (Electrical & Electronics) GGCT Jabalpur
2. 2. Classification of electrical machines Electrical machines Static Machine Rotating Machines Transformer
3. 3. Classification of electrical machines Electrical machines DC Machines AC Machines DC Generator DC Motor Asynchronous Machine Synchronous Machine Synchronous Generator Synchronous Motor Induction Machines 1 phase 3 phase 1 phase 3 phase 1 phase 3 phase
4. 4. DC Machines Basically Dcmachine divided in two parts:- 1. DC Generator 2. DC Motor There are two types of generators, one is AC generator and other is DC generator. Whatever may be the types of generators, it always converts mechanical power to electrical power
5. 5. DC Machines There are two types of motor, one is AC motor and other is DC motor. It is an electro-mechanical device that converts electrical energy to mechanical energy. Generators is based on the fundamental principle of Faraday’s laws of Electromagnetic Induction.
6. 6. DC Generator Generators is based on the fundamental principle of Faraday’s laws of Electromagnetic Induction. According to these law, when an conductor moves in a magnetic field it cuts magnetic lines force, due to which an emf is induced in the conductor. The magnitude of this induced emf depends upon the rate of change of flux (magnetic line force) linkage with the conductor.
7. 7. DC Generator Hence the most basic tow essential parts of a generator are 1. A magnetic field and 2. Conductors which move inside that magnetic field. Here N & S pole produce a magnetic flux & ABCD is a show conductor.
8. 8. DC Generator
9. 9. DC Generator
10. 10. DC Generator The nature of induced EMF in the DC Generator is always a AC (alternating) nature. With the help of commutator this induced AC (alternating) nature emf is converted in to a DC nature.
11. 11. DC Generator The direction of induced current in the conductor in DC generator is determined by Fleming Right Hand rule.
12. 12. DC Generator
13. 13. DC Motor This DC or direct current motor works on the principal, when a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move. This is known as motoring action. If the direction of electric current in the wire is reversed, the direction of rotation also reverses.
14. 14. DC Motor
15. 15. DC Motor When magnetic field and electric field interact they produce a mechanical force, and based on that the working principle of dc motor established. The direction of rotation of a this motor is given by Fleming’s left hand rule,
16. 16. DC Motor The force which is experienced by DC machine is determined by:- F = BIL where, B = Flux Density I = Current flowing in conductor L = Length of conductor Construction wise a DC motor is exactly similar to a DC generator, but electrically it is just the opposite.