Sensorless Control Techniques of Switched Reluctance Motor

Name: Sensorless Control Techniques of Switched Reluctance Motor
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Learn different sensorless techniques and get new ideas to propose a new sensorless method of SRM

Created byDr. Jignesh Makwana

Last updated 11/2024

English

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What you'll learn

Fundamentals of Sensorless Control of SRM Drive
Various Rotor Position Estimation Techniques
Flux-linkage based sensorless method
Current gradient sensorless method
Research Scope and Ideas

Course content

7 sections • 39 lectures • 3h 44m total length

Course Introduction4:55
Introduction to Sensorless Control of SRM13:15
Introduce sensorless control of switched reluctance motors, showing how eliminating mechanical position sensors reduces cost, weight, and size while employing flux linkage, current sensing, and observer-based techniques.

Introduction to Flux-linkage Based Rotor Position Estimation7:10
Demonstrates flux-linkage based rotor position estimation for sensorless switched reluctance motors using magnetic characteristics and lookup tables. Derives rotor angle from flux and current with voltage and current sensing.
Look-up Table Based Method10:14
Look-up table based sensorless method for switched reluctance motor control, deriving rotor angle from flux estimates and voltage-current data to generate commutation pulses in open and closed loop.
Summary of Look-up Table Based Method4:38
Explore the lookup table based flux linkage method for sensorless switched reluctance motor control, noting its high accuracy and the sensor, data, and cost challenges.
Research Scope and Ideas5:28
Explore research scope and ideas for sensorless control of flux linkage in switched reluctance motors, evaluating lookup-table, modeling, and neural network approaches to estimate rotor angle from voltage and current.
ANN Based Sensorless Method7:39
Understand how an artificial neural network replaces lookup tables in sensorless switched reluctance motor control, using a forward network to map current, voltage, and rotor angle via training.
Fixed Turn-off Angle Method16:51
Apply the fixed turn-off angle sensorless method for switched reluctance motors, using a single magnetic angle and a voltage–current lookup table to estimate flux and control phase commutation.
Analytical Method20:47
Analyze a flux-difference based analytical method for sensorless rotor position estimation in a switched reluctance motor, using two magnetic go angles and a mapping factor with linear compensation.
Summary of Flux-linkage Based Sensorless Method7:09
Explore flux linkage based sensorless methods for switched reluctance motors, including lookup, table, neural network, dunlop angle, and analytical approaches. Assess sensor needs and magnetic data requirements for practical use.

Features of Current Gradient Sensorless Method3:59
Explore the current gradient sensorless method, which requires only a current sensor and does not rely on prior magnetic state knowledge beyond rotor and stator pole configuration, enabling low-cost deployment.
Concept of Current Gradient Sensorless Method3:53
Explore the current gradient sensorless method for switched reluctance motors, detecting the inductance peak by monitoring the rate of change of current to generate a per-phase detection pulse theta PDP.
Working Principle of Current Gradient Sensorless Method9:46
Explore the working principle of the current gradient sensorless method, using a 6 by 4 rotor-pole model to infer rotor position from current rise and inductance changes with phase switching.
Mathematical Representation of CGSM7:55
Represent CGSM mathematically by modeling current dynamics before and after PDP. Link voltage, inductance, and duty to the rate of change of current and detect zero crossing for pulse generation.
Block Diagram of CGSM4:51
Explore the current-gradient sensorless method for switched reluctance motors, detailing current detection, low-pass filtering, and zero-crossing detection to generate commutation pulses.
Current Peak Detection Stage4:08
Describe the current peak detection stage in switched reluctance motor control using two low-pass filters, derivative of the current, and zero crossing detection to generate a one-shot pulse for PWM.
Commutation Logic8:33
Explain commutation logic for switched reluctance motors using a PLL and counters to multiply/divide input frequency, synchronize phase outputs, and activate rotor phases A, B, and C at precise angles.
Calculation of Resolution, Speed and Accuracy7:08
Assess the resolution, speed, and accuracy of depletion estimated with the current gradient sensor lift method for a switched reluctance motor, using stroke angle and PLL factors.

List of Issues with CGSM1:28
Explore key sensorless control challenges in switched reluctance motors, including the changeover period, rotor-stator effects, detection pulse delays, non-synchronous bandwidth, and single-pole operation.
Changeover Period2:09
Explore the changeover period in sensorless control of switched reluctance motors, analyzing how startup methods transition to sensorless control, and how speed and rotor angle fluctuations affect stability and synchronization.
Effect of Stator Rotor Pole Arc4:05
Vary rotor and stator pole arcs to see how the inductance profile changes and the detection pulse angle shifts from 60° to about 51.5°.
Delay in Peak Detection Pulse4:26
Examine the delay in pig detection pulse caused by the low-pass filter and derivative steps, and propose speed-dependent compensation for rotor angle at 60 degrees in sensorless switched-reluctance control.
Non-Synchronized PWM Pulse11:39
Explore how non-synchronized pwm pulses affect commutation and current waveform in sensorless switched reluctance motors, highlighting speed dependence, frequency variation, and synchronization challenges.
Effect of Current Chopping Mode3:04
Explore how soft and hard current chopping modes affect current decay, reverse voltage during recovery, and detection pulses in sensorless switched reluctance motors.
Single Pulse Operation3:39
Learn how single pulse operation affects current and detection in sensorless switched reluctance motors, including the role of commutation pulse, high-speed behavior, and current limiting strategies.
Hysteresis Current Control Mode2:15
In sensorless control of switched reluctance motors, current greedy methods fail to detect current peaks, highlighting the need for hysteresis current control mode that switches based on a current reference.
Summary of Issues with CGSM1:42
analyze issues with the current sensorless control method for switched reluctance motors, noting easy implementation yet changeover and detection delays, and encourage improvements for application-specific solutions.
Scope of Work with CGSM4:33
Explore the scope of the current gradient sensorless method for sensorless control of the switched reluctance motor, addressing pll-based detection challenges, speed and load variations, and open-loop performance considerations.

Introduction to Other Sensorless Methods1:38
Explore additional sensorless techniques for switched reluctance motors, including state observer, active probing, modulated signal injection, current chopping, and regenerative current, with notes on benefits, limitations, and startup needs.
State Observer Based Method5:15
Explore the state observer based method for sensorless switched reluctance motor control, comparing model-generated current to actual current to estimate rotor position and speed.
Active Probing Method4:30
Explore active probing method for sensorless control of switched reluctance motors, injecting high-frequency pulses into a non-conducting phase to estimate inductance and rotor angle at standstill, noting mutual inductance effects.
Modulated Signal1:42
Describe modulated signal injection for sensorless control of a switched reluctance motor, using frequency, amplitude, and phase modulation to estimate energy-phase inductances, and noting accuracy limits and cost from multiplexing.
Current Chopping3:16
Explore current chopping in sensorless switched-reluctance motor control, regulating current via current gradient methods and rise/fall time indicators; note limitations at high speed and single-pulse operation.
Regenerative Current Method2:38
Learn the regenerative current method for sensorless switched reluctance motor control, monitoring free-wheeling current, using a fixed turn-off angle, and achieving simple implementation but with limited speed and efficiency.
Initial Start-up Methods5:34
Explore initial start-up methods for sensorless switched reluctance motors, including single-phase excitation, two-phase excitation for center alignment, and high-frequency probing pulses to estimate rotor position, then transition to sensorless operation.

Requirements

Fundamentals of Switched Reluctance Motor

Description

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.

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.
This course is for all who want to learn sensorless operation of the Switched Reluctance Motor.
This course will help the students who are searching for the latest research area or the topic for the project in the field of electric motor or electric vehicle.

Sensorless Control Techniques of Switched Reluctance Motor

What you'll learn

Explore related topics

Course content

Introduction2 lectures • 18min

Flux Linkage Based Method8 lectures • 1hr 20min

Current Gradient Sensorless Method (CGSM)8 lectures • 50min

Issues with CGSM10 lectures • 39min

Comparison1 lecture • 6min

Introduction to Other Sensorless Methods7 lectures • 25min

Summary3 lectures • 7min

Requirements

Description

Who this course is for: