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PROJECT DESCRIPTION

The major intention of this project is to control the speed of the single phase induction motor by  cyclo-converter technique using thyristors. It is used to operate the motor with three speed ranges relating to (F,F/2,F/3) where F is the fundamental frequency. It is the most economical speed-control technique.

This proposed system uses a microcontroller of the 8051 family and a rectified power supply. In this system, the induction motor is controlled by a dual-SCRs bridge, which is interfaced to the microcontroller through an opto-isolator. Two switches are connected to the microcontroller for controlling the movement of the motor. The opto-isolator is used for isolating the loads from mains supply to the control circuit.

The speed control of induction motor is achived by selecting suitable triggering to the SCR bridge from the microcontroller as per the program. The microcontroller receives selection of bridge  from the switches and delivers the desired trigger to the SCRs to conduct in F,F/2,F/3 to feed to the motor  3 steps of frequency .As speed of the induction motor sepends on frequency the  speed variation is achieved in three steps: F, F/2, F/3.

This project in future can be enhanced to control the speed of a three-phase induction motor. It can also be coupled with a firing-angle control for any desired speed instead of 3 steps only.

Note: An induction motor is used to observe the output of the project. The motor is not supplied along with the kit. However, it can be purchased at extra cost.

PROJECT HIGHLIGHTS
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.
Branding-free material.
Pre-programmed Microcontroller.
BLOCK DIAGRAM
Hardware Requirements
  • 8051 series Microcontroller
  • Crystal
  • SCRs
  • Opto- isolators
  • Transformer
  • Diodes
  • LED
  • Slide Switches
  • Capacitors
  • Resistors
  • Bulb
Software Requirements
  • Keil compiler
  • Languages: Embedded C or Assembly
Q & A
Q:  Which microcontroller is used in this project?
A:  8051 family 40 pin microcontroller is used in this project.
Q:  What is a Cyclo-converter?
A:  Cyclo-converter converts a constant voltage, constant frequency AC waveform to another AC waveform of a lower frequency by synthesizing the output waveform from segments of the AC supply without an intermediate DC link
Q:  What is the rating of Induction motor used?
A:  230V, 1500RPM, ¼HP rated induction motor is used.
Q:  How can the speed be reduced?
A:  By operation modes in F(Fundamental frequency), F/2 and F/3, speed can be reduced.
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