This is ac machine ppt

2. SHRI SIDDHESHWAR WOMEN’S POLYTECHNIC SOLAPUR
Electrical engineering department ⚡ ⚡⚡
Prepared by :-
• Arwat Pallavi ( 3301)
• Badganchi Shraddha ( 3302)
• Benjarpe Neerja (3303)
• Bhosale Sakshi ( 3304)
PowerPoint Presentation on Types of Starters
Guided by :- Mr Gauda P.B.

3. CONTENT
• Introduction Of starter
• Types of starter
• Advantages of starter
• Disadvantage of starter
• Application of starter
• Conclusion
• Reference

4. INTRODUCTION OF STARTER
• A motor starter is an electrical device that is used to start & stop a motor safely. Similar to
a relay, the motor starter switches the power ON/OFF & unlike a relay, it also provides a low
voltage & overcurrent protection.
• Starter is a device which is used to limit the high starting current

5. TYPES OF STARTER
• Stator resistance starter
• Rotor resistance starter
• Star delta starter
• DOL starter
• Auto transformer starter
• Soft starter

6. STATOR RESISTANCE STARTER

7. STATOR RESISTANCE STARTER
In order to apply the reduced voltage to the stator of the induction motor, three resistances are
are added in series with each phase of the stator winding. Initially the resistances are kept
maximum in the circuit. Due to its large voltage gets dropped across the resistances.
Advantages
• simple construction
• easy to use
• cost is less
• it requires less space

8. ROTOR RESISTANCE STARTER

9. • A rotor resistance starter is used in a high rating slip ring induction motor. It uses an external
resistance/phase in the rotor circuit so that the rotor will develop a high value of torque.
High torque is produced at low speeds when the external resistance is at its higher value.
• Advantages
1. High starting torque may be obtained with the rotor resistance starter.
2. It improves the power factor of the motor.
3. Absence of line current harmonics.
4. Reduced starting current.
5. Smooth and wide range of speed control is possible.

10. STAR DELTA STARTER

11. • Star delta starters are another device that may be used to reduce current demand during
motor startup. It is often used for starting three-phase induction motors, but can only be used
when starting the motor without load and when the required starting current is relatively low.
• Advantages
1. Starting Current and torque is reduced to 33%
2. Works good in light-loaded conditions also.
3. No Heat will be produced.
4. Less Mechanical Stress.
5. Automatic changeover makes reduces manual work.
6. Mechanical stress is less.

12. DOL STARTER

13. • A DOL starter (also known as a direct on line starter or across the line starter) is a method of
starting a 3 phase induction motor. In a DOL Starter, an induction motor is connected
directly across its 3-phase supply, and the DOL starter applies the full line voltage to the
motor terminals.
• Advantages
1. It starts very quickly without any deviations.
2. Its cost is low compared to Star Delta and Soft Starter.
3. It can be implemented easily.
4. Troubleshooting will be easy compared to other starters.
5. Starting Torque is high.
6. Compact size.

14. AUTO TRANSFORMER STARTER

15. • The autotransformer starter can be used for starting both star and delta connected 3-phase
induction motors. In this method, the starting current of the motor is limited by using a 3-
phase autotransformer to decrease the initial applied voltage to the stator.
• Advantages
1. Better voltage regulation
2. Low requirements of excitation current
3. Lower cost
4. It needs less copper

16. SOFT STARTER ( VVVF)

17. • Variable Voltage Variable Frequency (VVVF) Lift Drive employs frequency inverter technology
which regulates input voltage and frequency throughout the journey, drawing much less current during
acceleration and deceleration.
• Advantages
1. Smooth start and stop.
2. 2.no jerking of load.
3. Exact positioning.
4. Better protection for motor.
5. High/low speed selection.
6. Reliability of break shoe.
7. Programmable break control.
8. Easy circutry.

18. ADVANTAGES OF STARTERS
• prevents the motor from getting overheated
• contributes smooth acceleration
• extends the life of your machine
• it saves a good amount of electricity

19. APPLICATION OF STARTERS
• stopping, reversing and protecting electric motors.
• Controls the electrical power for starting a motor.
• to protect motors from damage that can be caused by very high current and
torque during startup.
• To start and control the speed of a motor

20. CONCLUSION
•Reference
• https://www.c3controls.com/white-paper/industrial-control-basics-motor-starters/
• https://www.electricaltechnology.org/2020/02/motor-starter.html
We are understand the types of Starter and their advantage and disadvantage