Design of variable filter for speed control of induction motor

Project Title

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

Induction motors are widely used in residential, commercial and industrial applications. Almost 80% of motors in industrial areas are induction motors. Induction motors have many advantages over other motor however it does not inherently have the ability of speed control which makes it inefficient to operate on lighter loads. There is many methods to control the speed of induction motor the best among those is the V/f method. To obtain this objective we will be designing a prototype for speed control of single phase induction motor by V/f control method, which contains full wave rectifier, DC link and an inverter, control circuit is used for inverter to observe ac sine wave output, but the output is not perfectly sine wave and contains harmonics, to remove such harmonics and smoothen the ac output to a sine wave a filter circuit is used at output of inverter before the motor, but this filter is only suitable for particular voltage and frequency values, as we change the voltage and frequency to vary the speed of motor the output waveform will no longer be a perfect sine wave and contains harmonics which are harmful to our system. To address this problem a variable filter circuit is design using power electronic switches, the value of filter circuit changes according to the values of voltage and frequency & fits perfectly to obtain a AC sinusoidal waveform. Hence a efficient and safe operation is obtained for speed control of induction motor.

Project Objectives

To design a simulink model for speed control of single phase induction motor
To design simulink model of filter circuit for variable voltage and frequency at inverter output
To make hardware for speed control of single phase induction motor with filter circuit
Compare the results of simulink model and hardware

Project Implementation Method

Detailed study about variable frequecny drive and filter design

Designing simulink model using MATLAB
Design filter circuit on simulink model
Working on arduino code for control circuit
Designing hardware model
Performance analysis of hardware model
Results & observations
Writing thesis

Benefits of the Project

To make the indcution motors more efficient by operating according the load requirement.
To remove the harmonics generated in system while contrilling the speed on induction motor.
Simple, efficient and low cost control circuit design.

Technical Details of Final Deliverable

This proposal provides a brief overview of the design of speed control of single phase induction motor. Speed control of induction motor provides a significant advantage of energy efficient use. The variable filter circuit provides more flexibility in range of speed control of motor than a fixed filter circuit, it also significantly reduces the harmonics generated comparing to the fixed filter circuit design.

Final Deliverable of the Project

Hardware System

Core Industry

Energy

Other Industries

Core Technology

Others

Other Technologies

Sustainable Development Goals

Decent Work and Economic Growth, Industry, Innovation and Infrastructure, Responsible Consumption and Production

Required Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
Induction motor	Equipment	1	12000	12000
Diodes	Equipment	20	10	200
IGBT or MOSFET switches	Equipment	8	100	800
Arduino	Equipment	2	1500	3000
Capacitors	Equipment	20	20	400
Inductors	Equipment	5	350	1750
Transformer	Equipment	1	350	350
Potentiometer and Resistors	Equipment	30	10	300
Optocouplers	Equipment	8	50	400
Gate driver ICs	Equipment	8	150	1200
LCD	Equipment	1	400	400
wires, soldering board and other material	Equipment	1	2500	2500
Printing and others	Miscellaneous	1	2500	2500
IR sensor	Equipment	1	200	200
			Total in (Rs)	26000