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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 smooth 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.

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.

Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Non-Microcontroller Project.
Branding-free material.
Solid State Soft Starter.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
Electronic Soft Start for 3 Phase Induction Motor
Hardware Requirements
  • Op-amps as comparators
  • Opto-isolators
  • Thyristors
  • Transistors
  • Regulator
  • Diodes
  • Transformers
  • Resistors
  • Capacitors
  • LEDs
  • Lamps
Software Requirements
Q & A
Q:  What is soft start?
A:  Gradually increasing the supply voltage to the motor is called soft start
Q:  Why bulb is used instead of motor?
A:  In order to visualize the soft start it is better to use a bulb.
Q:  What is the rating of motor to be used in this project?
A:  A 3 phase ΒΌ HP motor is used in this project.
Q:  Does this project use any microcontroller?
A:  No it is a non-microcontroller based project
Average Rating
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Showing 4 of 12 reviews Show All
Saurav, Bengaluru on 4th June, 2016, 04:44 PM

I have come to know about edgefx through my senior. So, i directly google the website..
I have decided to buy project from edgefx because i have no time and i like most about edgefx kit was DIY kit (DO it Yourself) Kit
the kit was delivered on time with right components..
i have searched in the website and i have purchased it..

Priyam Solanki, Vadodara on 14th November, 2015, 06:52 PM

I came to know about Edgefx through my friend and I was searched for 3 phase projects.
I know about edgefx that it is reliable. Everything is fine
One of my Staff helped me to how to place an order a project.

Gaurav boda, anand on 14th November, 2015, 06:41 PM

I was searched my project Electronic Soft Start for 3 Phase Induction Motor and i find edgefx in Google.
I found my project Title so decided to buy that project from Edgefx.
I have purchase through online

YOGESH JAVIYA, SURAT on 13th July, 2015, 10:35 AM

I came to know about Edgefx through my senior. I directly typed Edgefx kits in Google.I decided to buy a kit from Edgefx by the words of my senior. And I like the complete kit.Yes the kit delivered on time with the right components.No Improvements required.

Rating Breakdown (12 Reviews)

Edgefx Technologies Pvt. Ltd.,
Plot No. 105, 3rd Floor,
Liberty Plaza, Himayathnagar,
Hyderabad - 500029,
Telangana, India
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