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PROJECT DESCRIPTION

Main objective of this project is to protect the induction motor by applying a low-voltage for soft start, and then to gradually increase the voltage across the motor. Usually, the motor draws more current at the start condition, which may cause damage to the winding of the motor.

The proposed system used for getting soft start features for the induction motor employing two anti-parallel SCRs in series with the supply.

 The proposed system is built with two anti-parallel SCRs connected in series with an induction motor to the main supply. A pair of Opto-coupler is connected to trigger the back-to-back SCRs with desired isolation from the controlling section.

During the start of the motor, the firing angle is heavily delayed by receiving delayed pulses from the operational amplifier. In this project, the op-amp operates as a comparator that compares zero voltage pulses to develop a saw tooth voltage which is further compared against a varying voltage by charging and discharging of the capacitor to develop delayed pulses for triggering the SCRs.

A lamp is provided in this project instead of an induction motor for demonstration purpose. However, a motor of 0.25 HP (not supplied with this project) can be used.

This project in future can be enhanced by using six SCRs: two connected back to back for each phase. 

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Main objective of this project is to protect the induction motor by applying a low-voltage for soft start, and then to gradually increase the voltage across the motor. Usually, the motor draws more current at the start condition, which may cause damage to the winding of the motor.

The proposed system used for getting soft start features for the induction motor employing two anti-parallel SCRs in series with the supply.

 The proposed system is built with two anti-parallel SCRs connected in series with an induction motor to the main supply. A pair of Opto-coupler is connected to trigger the back-to-back SCRs with desired isolation from the controlling section.

During the start of the motor, the firing angle is heavily delayed by receiving delayed pulses from the operational amplifier. In this project, the op-amp operates as a comparator that compares zero voltage pulses to develop a saw tooth voltage which is further compared against a varying voltage by charging and discharging of the capacitor to develop delayed pulses for triggering the SCRs.

A lamp is provided in this project instead of an induction motor for demonstration purpose. However, a motor of 0.25 HP (not supplied with this project) can be used.

This project in future can be enhanced by using six SCRs: two connected back to back for each phase. 

PROJECT HIGHLIGHTS
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Non-Microcontroller Project.
Branding-free material.
Call/mail for Tech Support from 10 am - 7 pm IST.
×
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Non-Microcontroller Project.
Branding-free material.
Call/mail for Tech Support from 10 am - 7 pm IST.
BLOCK DIAGRAM
Hardware Requirements
  • Op-amp
  • Opto-isolators
  • SCRs
  • Voltage Regulator
  • Transformer
  • Diodes
  • LED
  • Resistors
  • Capacitors
  • Lamp
×
  • Op-amp
  • Opto-isolators
  • SCRs
  • Voltage Regulator
  • Transformer
  • Diodes
  • LED
  • Resistors
  • Capacitors
  • Lamp
Q & A
Q:  What is soft start?
A:  Soft Start means gradually increasing the supply voltage to the motor
Q:  Why bulb is used instead of motor?
A:  In order to visualize the soft start it is better to use a bulb
Q:  Can we use motor instead of bulb?
A:  Yes, Motor of rating ¼HP, 230V can be used.
Q:  Does this project have a pre-programmed microcontroller?
A:  No, it is a non-microcontroller based project
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