Electronic Soft Start for 3 Phase Induction Motor

Model: 163A

Solderable DIY project kit for Engineering & Diploma students Worldwide

Do-It-Yourself Kit :

Includes complete hardware comprising of discrete components, modules, PCB, controller etc. and tested program code for building the project. Extensive documentation for project execution including step-by-step instructions for Circuit building, Assembly procedure and Troubleshooting. (Tool kit-Multimeter, Soldering iron and program burner not included in the kit)

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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.

Branding-free material.

Non-Microcontroller Project.

Call/mail for Tech Support from 10 am – 7 pm.

Can be Customized for Arduino, Raspberry Pi, PIC


Hardware Requirements

  • Op-amps as comparators
  • Opto-isolators
  • Thyristors
  • Transistors
  • Regulator
  • Diodes
  • Transformers
  • Resistor
  • Capacitor
  • Lamps
  • LEDs

Software Requirements

  • None

Q & A

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  1. Rated 4 out of 5


    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..

  2. Rated 4 out of 5

    Priyam Solanki

    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.

  3. Rated 5 out of 5

    Gaurav boda

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  4. Rated 5 out of 5


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  5. Rated 5 out of 5


    I Came to Know about Edgefx through Google. I used the Project title as a keyword to find Edgefx.I decided because it’s Apt for my requirement. I like the Quality. After purchasing from Edgefx.Yes the kit delivered on time with right components.I directly purchased through online.No Improvements required.