INDUCTION MOTOR PPT.ppt
- 1. Basic Electrical and Electronics INDUCTION MOTOR
- 2. INDUCTION MOTOR In olden days DC machines are widely used due to its smooth speed control and production of high starting torque After few decade AC Machines replaced DC machines due to following reasons HISTORY
- 3. INDUCTION MOTOR Availability of AC supply ( Generation is AC Supply) AC Machines are simple and rugged constructions High Efficiency and reasonably good power factor High reliability Design and maintenance cost is Low Simple starting arrangement Advantages of AC Machines over DC Machines
- 4. INDUCTION MOTOR it works on the principle of Induction so called Induction motor WHAT IS INDUCTION There is no electrical connection from main supply to rotor winding, stator winding is directly connected to AC source, where as rotor winding receives Energy from stator by means of INDUCTION Working Principle of Induction motor
- 5. INDUCTION MOTOR Induction motor consist of two parts Stationary part known as STATOR Rotating part known as ROTOR And these two are separated from each other by small air-gap (about 0.4 mm to 4 mm) Construction
- 6. INDUCTION MOTOR iron (or) steel yoke (frame) Hollow, cylindrical core made of silicon steel with laminations Slots on the inner periphery of the laminated core Insulated conductor ( called stator winding) Star connected Delta connected Construction of stator
- 7. INDUCTION MOTOR Construction of stator
- 8. INDUCTION MOTOR Hollow, cylindrical core (slotted on outer periphery) shaft Conductors ( called rotor winding) Construction of Rotor
- 9. INDUCTION MOTOR Depending on the winding connections rotors are of two types Squirrel cage Rotor Wound (or) Slip ring rotor types of Rotor
- 10. INDUCTION MOTOR Laminated cylindrical core having parallel slots on its outer periphery Conductor or winding which is placed in each slot End rings All these conductors joined at each end by metal rings called end rings as shown Equivalent circuit Squirrel cage Rotor
- 11. INDUCTION MOTOR Squirrel cage Rotor
- 12. INDUCTION MOTOR Laminated cylindrical core having a 3-phase star winding One side of winding short circuited and other End connected to 3 slip ring Brushes Each slip ring is connected to brushes Slip Ring Rotor
- 13. INDUCTION MOTOR Slip Ring Rotor
- 14. INDUCTION MOTOR Slip Ring Rotor
- 15. a a’ Single N turn coil carrying current i Spans 180o elec Resultant flux Principle of operation
- 16. Single N turn coil carrying current i Spans 180o elec b' b Resultant flux Principle of operation
- 17. Single N turn coil carrying current i Spans 180o elec c' c Resultant flux Principle of operation
- 18. 3-PHASE SINUSOIDALLY DISTRIBUTED WINDINGS
- 20. INDUCTION MOTOR Depending upon the rotor connections induction motors are two types Squirrel cage induction motor Slip ring induction motor Types of INDUCTION MOTORS
- 21. INDUCTION MOTOR The rotor winding is short circuited at each end by metal rings called end rings The motor which is designed with squirrel cage rotor called squirrel cage induction motor SQUIRREL CAGE INDUCTION MOTOR
- 22. INDUCTION MOTOR One side of the windings are short circuited and other ends are brought out and connected to slip rings (mostly star connected) The motor which is designed with slip ring rotor called slip ring induction motor SLIP RING INDUCTION MOTOR