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Sensorless Control Techniques of the SRM Drive

Learn different sensorless techniques and get new ideas to propose a new sensorless method of SRM

Language: English

Instructor: Dr. Jignesh Makwana

Why this course?


The Switched Reluctance Motor provides a magnetless solution for the variable speed drive which allows wider temperature variation without distorting the performance and also reduces the manufacturing cost as well as process time. It offers high efficiency in compact size. The wide constant power region makes it most suitable for the electric vehicle application. New trends in technology demand energy efficiency and compact electric motor drive all over the world which results in an increase in demand for the SRM drive.

Unfortunately, SRM can not work with direct supply, neither with ac supply like Induction Motor, nor with dc supply like a DC Motor. It needs a power electronics converter with an accurate rotor positioning system to switch the phase excitation on time.  These  position sensors are mounted on the shaft of the motor which increases the cost and overall size of the motor and also reduces the reliability of the drive. Thus, to eliminate the requirement of position sensor from the SRM drive is becoming a prime interest of many researchers working in the development of the switched reluctance motor. This course covers fundamentals of the sensorless techniques of the SRM Drive.

Numbers of sensorless techniques for the SRM drive have been published in the last decade. All the techniques use some basic principle of sensorless control and work around it with some modification according to requirements. This course covers two basic principles of the sensorless control techniques in detail. First is flux-linkage based sensorless operation and second is current gradient sensorless method. Working, advantages and limitations of several other sensorless control techniques are also explained in this course.

This course is designed for the research scholar who wants to work on sensorless control techniques of the SRM Drive.

This course will help understanding basic sensorless control techniques. It will also give ideas about how to modify or propose a new sensorless method.

Course Summary

Who this course is for:

  • This course is designed for the research scholar who wants to work on sensorless control techniques of the SRM Drive.

What you'll learn:

  • Fundamentals of Sensorless Control of SRM Drive

  • Various Rotor Position Estimation Techniques

  • Research Scope and Ideas


  • Fundamentals of Switched Reluctance Motor

Course Curriculum

Ch 1: Introduction

1.1 Course Introduction

1.2: Introduction to Sensorless Control of SRM

Ch 2: Flux Linkage Based Method

2.1: Introduction to Flux-linkage Based Rotor Position Estimation

2.2: Look-up Table Based Method

2.3: Summary of Look-up Table Based Method

2.4: Research Scope and Ideas

2.5: ANN Based Sensorless Method

2.6: Fixed Turn-off Angle Method

2.7: Analytical Method

2.8: Summary of Flux-linkage Based Sensorless Method

Ch 3: Current Gradient Sensorless Method (CGSM)

3.1: Features of Current Gradient Sensorless Method

3.2: Concept of Current Gradient Sensorless Method

3.3: Working Principle of Current Gradient Sensorless Method

3.4: Mathematical Representation of CGSM

3.5: Block Diagram of CGSM

3.6: Current Peak Detection Stage

3.7: Commutation Logic

3.8: Calculation of Resolution, Speed and Accuracy

Ch 4: Issues with CGSM

4.1: List of Issues with CGSM

4.2: Changeover Period

4.3: Effect of Stator Rotor Pole Arc

4.4: Delay in Peak Detection Pulse

4.5: Non-Synchronized PWM Pulse

4.6: Effect of Current Chopping Mode

4.7: Single Pulse Operation

4.8: Hysteresis Current Control Mode

4.9: Summary of Issues with CGSM

4.10: Scope of Work with CGSM

Ch 5: Comparison

5.1: Flux-linkage Based Method Vs CGSM

Ch 6: Introduction to Other Sensorless Methods

6.1: Introduction to Other Sensorless Methods

6.2: State Observer Based Method

6.3: Active Probing Method

6.4: Modulated Signal

6.5: Current Chopping

6.6: Regenerative Current Method

6.7: Initial Start-up Methods

Ch 7: Summary

7.1: Classifications of Sensorless Techniques




Course Preview

Course Instructor

IMG_20180629_025448 - Copy.jpg

Ph.d, IIT Roorkee

In 2013, Dr. Jignesh Makwana earned a Ph.D. in Electrical Engineering from the Indian Institute of Technology Roorkee. Since the previous 15 years, he has been teaching power electronics, electric drives, control systems, and other subjects in engineering colleges. From 2013 until 2017, he was an associate professor and the head of the Electrical Engineering Department at Marwadi University in Rajkot. He currently works as a product design and development consultant for a number of firms in the fields of electric drives and power electronics. He also assists numerous reputable universities in developing engineering curricula and syllabuses as a BOS member.

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