Implementation Of Soft Starter Using Three Phase Induction Motor
The project is designed to provide a soft and smooth start to a 3 phase induction motor. The three phase induction motor during the initial starting condition draws up much higher current than its capacity and the motor instantly reaches the full speed. This results in a mechanical jerk and high ele
Project Title
Implementation Of Soft Starter Using Three Phase Induction Motor
Project Area of Specialization
Project Summary
The project is designed to provide a soft and smooth start to a 3 phase induction motor. The three phase induction motor during the initial starting condition draws up much higher current than its capacity and the motor instantly reaches the full speed. This results in a mechanical jerk and high electrical stress on the windings of the motor. Sometimes the windings may get burnt. The induction motor should start smoothly and gradually catch up the speed for a safer operation. This project is designed to give a soft start to the induction motor based on the SCR firing triggered by heavily delayed firing angle during starting and then gradually reducing the delay till it reaches zero voltage triggering. This results in low voltage during start and then gradually to full voltage. Thus the motor starts slowly and then slowly picks up to full speed [1]. This project consists of a six anti-parallel SCRs, two for each phase, the output of which is connected to a set of lamps representing the coils of a 3 phase induction motor. The charging and discharging of capacitors is interfaced to comparators resulting in delayed firing pulses during start and then gradually reducing the delay till the motor runs at full speed. Output from the comparators is fed through opto-isolators to trigger the SCRs. Further the project can be enhanced by using IGBTs in place of SCRs with PWM control to reduce harmonic distortions often encountered in SCR triggering mechanism.
Project Objectives
? Eliminates high inrush current and high mechanical torque on startup.
? Reduction in cable and switch-gear rating in the power supply network.
? Limits line voltage dip.
? Soft, stepless acceleration & deceleration.
? Kick-start function for heavy duty and functional loads with high starting torque.
? Current limiting characteristic.
? By-pass contactor increases energy savings.
? Avoid current and torque peaks, Put less electrical stress on the power supply network and mechanical stress on entire drive.
? Reduce stress on couplings and other transmission devices (gear boxes, shafts, belts, etc).
Project Implementation Method
? Star-Delta Stater.
? Stator-Resistor Statrting.
? Auto-Transformer.
? Three phase induction motor soft starting using thyristor.
There are several techniques which are mention above but we prefered the last one because of, It is more efficient and more precise than these all techniques.
Benefits of the Project
? Eliminates high inrush current and high mechanical torque on startup.
? Reduction in cable and switch-gear rating in the power supply network.
? Limits line voltage dip.
? Soft, stepless acceleration & deceleration.
? Kick-start function for heavy duty and functional loads with high starting torque.
? Current limiting characteristic.
? By-pass contactor increases energy savings.
? Avoid current and torque peaks, Put less electrical stress on the power supply network and mechanical stress on entire drive.
? Reduce stress on couplings and other transmission devices (gear boxes, shafts, belts, etc).
Technical Details of Final Deliverable
In this project we use the scr, by changing the firining angle of scr we control the initial starting current of three phase induction motor.For every firing angle we check diffrent output of the project.
Final Deliverable of the Project
Type of Industry
Technologies
Sustainable Development Goals
Required Resources
| Item Name | Type | No. of Units | Per Unit Cost (in Rs) | Total (in Rs) |
|---|---|---|---|---|
| resistor | Equipment | 100 | 10 | 1000 |
| capacitor | Equipment | 50 | 20 | 1000 |
| diodes | Equipment | 40 | 20 | 800 |
| ICs | Equipment | 40 | 200 | 8000 |
| ICs base | Equipment | 40 | 25 | 1000 |
| transistor | Equipment | 40 | 35 | 1400 |
| other | Equipment | 80 | 100 | 8000 |
| components delivery charges | Miscellaneous | 10 | 300 | 3000 |
| presentation prints | Miscellaneous | 5 | 200 | 1000 |
| thesis binding and printing | Miscellaneous | 3 | 1000 | 3000 |
| Total in (Rs) | 28200 |
If you need this project, please contact me on contact@adikhanofficial.com
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