3 ph induction motor ppt
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This document outlines and describes the key components and operating principles of three-phase induction motors, which are widely used in industrial applications due to their continuous operation. It discusses the main types of electrical machines and induction motors, including squirrel cage and slip ring induction motors. The document explains the basic working principle of three-phase induction motors, involving the generation of a rotating magnetic field in the stator that induces current in the rotor. It also describes the main components of three-phase induction motors such as the frame, stator, rotor, and windings.
3 ph induction motor ppt
- 1. Prof. AJAY B. BALAR Darshan Institute of Engineering & Technology, Rajkot (Gujarat)
- 2. Outlines: Introduction Types of Electrical Machines Types of 3-Ph induction motor Basic Principle Working Principle Compnents of induction motor Application Comparision between 1-ph I.M. & 3-ph I.M.
- 3. Electrical Machines are Electromechanical energy converson devices. Electrical motor coverts electrical energy into mechanical energy and electrcal generators are vice versa. Most of the Industrial load are inductive, especially 3-ph induction motors are widely used in industrial applications for continious operation.
- 4. 1.AC Machines 2.DC Machines AC Machines:- 1-Ph Induction Motor 3-Ph Induction Motor Synchronous motor 1- Ph Transformer 3-ph Transformer Altrnator or AC Generator
- 5. DC Machines:- -DC Motor -DC Generator DC Motor: DC Shunt Motor DC Series Motor DC Compound Wound Motor DC Generator DC Shunt Generator DC Series Generator DC Compound Wound Generator
- 6. Principle of Operation A Rotating Magnetic field (RMF) is set up in the stator when a 3- Phase supply is given. The stationary rotor cut the revolving field and due to electromagnetic induction an e.m.f. is induced in the rotor conductor. As the rotor conductor is short circuited current flows through them. It becomes a current carrying conductor in magnetic field and start rotating.
- 7. Slip of an Induction Motor Induction motor rotor always rotate at a speed less than synchronous speed. The difference between the flux (Ns) and the rotor speed (N) is called slip. % Slip (s) = Ns – N Ns *100 Where Ns=Synchronous Speed N= Actual Speed of rotor Slip speed = Ns – N
- 11. Frame Stator Stator Winding Rotor Rotor Winding Cooling Fan Bearings Frame: Frame provides mechanical support to the stator and rotor. It is made from casting materials. Stator: It is stationary part of induction motor. It consists stator winding It is housed on the motor frame. Arrangement of stator in 3-Ph induction motor are given below:-
- 12. Image of Rotor & Stator Winding of 3 phase Induction Motor
- 14. Rotor:- It is the rotating part of the induction motor. It is housed on the shaft of the induction motor. It has two ends, one is called Driving end and another is called non- Driving end. Mechanical load is connected on driving end while cooling fan is connected on non-driving end. Both the ends are connected with bearings for free rotation means of reduced friction losses. Arrangement of rotor of induction motor are given below: Components of 3-ph Induction Motor
- 21. Stator Windings: Star connected Delta connected Rotor Windings: It is wound as rotor bars and short circuited at both the ends through end rings.
- 23. According to rotor construction it can be Classified in two category according to rotor Construction:- 1. Squirrel cage induction motor 2. Slip ring induction motor
- 32. Squirrel cage Induction Motor:- Most of the application of industrial as well as domestic are this type of induction motor. Its construction is simple and rugged. Cheap copare to slipring IM Maintainance is easy Cost is less compare to slipring IM Can use at explosive area Starting torque is low compare to slip ring IM Application:- Leath machine, Compressors,centrifugal pump, in agriculture etc. where cost is most important factor
- 33. Slipring Induction Motor:- It has high starting torque compare to squirrel cage IM Construction is complicated Maintanance cost is high compare to squirrel cage IM Starter requires compulsory Can not use at explosive area Application:- Crane,hoist,lift and wherehigh starting torque is required