Working of synchronous machine, Construction of synchronous machine, Types of synchronous machine, Application of synchronous machine

Subject : AC Machine
Topic: Working of synchronous machine, Construction of
synchronous machine, Types of synchronous machine,
Application of synchronous machine

1. Shree S’ad Vidya Mandal Institute of Technology, Bharuch Presented by Presentation on ( Working of synchronous machine, Construction of synchronous machine, Types of synchronous machine, Application of synchronous machine ) NO NAME ENROLLMENT NO. 1. Patel Harshil 150450109032 2. Patel Mehafuz 150450109033 3. Patel Shivam 150450109036 4. Ujef Mohammad 150450109037

2. Content Introduction Working of synchronous machine Construction of synchronous machine Types of synchronous machine Application of synchronous machine

3. Introduction A synchronous machine is an ac rotating machine whose speed under steady state condition is proportional to the frequency of The magnetic field created by the armature currents rotates at the same speed as that created by the field current on the rotor, which is rotating at the synchronous speed, and a steady torque results. the current in its armature.

4. Working principle of synchronous machine Synchronous machines generally works on the principle of “electromagnetic induction”, when the magnetic flux is cut by a conductor, an e.m.f is induced in the conductor. The direction of this e.m.f is found by Fleming’s right hand rule. The magnitude of this induced e.m.f , as per the faraday’s law is found by rate of cut of magnetic flux by conductor.

5. The working can be explained similar as the working of the D.C generator. In D.C generator magnetic field is produce by field poles and the field is stationary and armature conductors are rotated mechanically. E.M.F is induced in the armature conductor. It is collected from commutator and brushes. In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field. The rotor is then turned by external means producing a rotating magnetic field, which induces a 3-phase voltage within the stator winding.

6. Field windings are the windings producing the main magnetic field (rotor windings) armature windings are the windings where the main voltage is induced (stator windings). In synchronous machine commutator is replaced by slip rings, so e.m.f is collected by brushes from the slip rings.

7. This system of stationary magnetic field and rotating conductor is adopted for very small capacity generators and it is not so popular for high voltage generators. The other most popular system of A.C generators is the armature conductors are stationary and magnetic fields are rotating.

8. Types of Synchronous Machine According to the arrangement of the field and armature windings, synchronous machines may be classified as Rotating armature type Rotating field type

9. Rotating-Field Type: In this type, the field system is rotating member and armature system is stationary member. The field winding arranged on rotor part. The field system ,mounted an shaft as shown in figure. DC supply is needed for field winding. This DC supply is fed through slip-ring brush arrangement.

10. The field winding connections are carried over shaft. This connection are properly insulated from shaft. The winding connection are given to sleep-rings. The number of slip-rings are require in our case Is 2. The DC supply used is 110 volt, 200 volt, 230 volt, 400volt. When DC supply fed to field winding it generates magnetic field and since field system is rotating member, the stationary armature winding cuts this flux thus an e.m.f . is induced in armature winding. The 3-phase ac voltage at output can be obtained.

11. 2. Rotating-Armature Type In this type, field system is stationary and armature system is rotating member. The armature system is supported on shaft. The DC supply can be directly connected with field winding terminals.

12. The armature is rotating member. It carries winding in slots as shown in figure. When armature rotates than the armature cuts the flux thus e.m.f . is induced in armature winding. Than we get 3-phase supply by use of slip-rings.