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Code

174

SOFT START OF SINGLE PHASE INDUCTION MOTOR
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The main intention of this project is to provide protection for a single-phase pump motor by applying initial voltage gradually from low to high for obtaining soft start. The pump motor draws more current than its rated capacity during their starting condition which may lead to the damage of the windings of the motor. In order to avoid this problem, applied voltage is gradually increased from low to high so that the soft start of the pump motor is performed.

6800.00 INR

4800.00 INR

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If you are an enthusiast

6800.00 INR
4800.00 INR

If you are short on time

5100.00 INR
3400.00 INR

For Institutions

4200.00 INR
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For Documentation

1100.00 INR
700.00 INR

For PCB

2100.00 INR
1100.00 INR

DESCRIPTION

The main intention of this project is to provide protection for a single-phase pump motor by applying initial voltage gradually from low to high for obtaining  soft start. The pump motor draws more current than its rated capacity during their starting condition which may lead to the damage of the windings of the motor. In order to avoid this problem, applied voltage is gradually increased from low to high so that the soft start of the pump motor is performed.

 

This project consists of  two anti-parallel SCRs connected in series with an induction motor to the supply. The time to  start the firing angle is heavily delayed by receiving delayed pulses from the operational amplifier. The op-amp operates in comparator mode that compares to zero voltage pulses to develop a sawtooth voltage which is further compared against a varying voltage by charging and discharging of a capacitor to develop delayed pulses for triggering the SCRs. A lamp is provided in this project in place of an induction motor for demonstration purpose.However a motor of 0.25 HP ( not supplied by us) can be used.

           

 

Furthermore, the project can be enhanced by using six SCRs: two connected back to back for each phase.  

HIGHLIGHTS

  • Provide Protection for a single phase pump
  • Applying initial voltage gradually from low to high.
  • Two anti-parallel SCRs connected in sesies
  • the op-amp operates in comparator mode
Comments

BLOCK DIAGRAM

HARDWARE REQUIREMENTS

  • LM339
  • LM324
  • op-amp
  • SCR
  • Capacitor
  • load
  • transformer

SOFTWARE REQUIREMENTS

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