This document discusses various rotor control techniques for induction motors, including:
1) Static rotor resistance control, which is simple but inefficient as slip power is wasted in rotor resistance.
2) Slip power recovery schemes like static Kramer and Scherbius drives that convert slip power to AC line power to improve efficiency.
3) Injection of voltage in the rotor circuit using a Schrage motor to produce an EMF that is injected at slip frequency to control speed.
The document provides details on operating principles, equivalent circuits, torque expressions, and power factor considerations for different rotor control induction motor drives.
Permanent Magnet Synchronous motor (PMSM) or Permanent Magnet AC motor:
Introduction to PMSM motor.
Types of PMSM Motor.
Mathematical modelling of PMSM motor.
Advantages and dis Advantages of PMSM motor
Er.Amit Chaurasiya studies at Azad Technical Campus Lucknow.All slide make very clear and easily understood suitable for Electrical Engineering students. I hope you will easily understand.
The motor which runs at synchronous speed is known as the synchronous motor. The synchronous speed is the constant speed at which the motor generates the electromotive force. The synchronous motor is used for converting the electrical energy into mechanical energy.
he stator and rotor are the two main parts of the synchronous motor. The stator is the stationary part, and the rotor is the rotating part of the machine. The three-phase AC supply is given to the stator of the motor.
This presentation provides information about Synchronous Motor.
Speed control of Three phase Induction motor using AC voltage regulatorShivagee Raj
The role of AC Voltage Regulator in speed control of three phase Induction Motor is to vary the supply voltage which in turn, changes the speed of motor .
Industrial Star Delta Starter for a 3-Phase Induction Motorelprocus
The most basic feature of an Induction motor is its self starting mechanism. Due to the rotating magnetic field, an emf is induced in the rotor, because of which current starts flowing in the rotor.
Permanent Magnet Synchronous motor (PMSM) or Permanent Magnet AC motor:
Introduction to PMSM motor.
Types of PMSM Motor.
Mathematical modelling of PMSM motor.
Advantages and dis Advantages of PMSM motor
Er.Amit Chaurasiya studies at Azad Technical Campus Lucknow.All slide make very clear and easily understood suitable for Electrical Engineering students. I hope you will easily understand.
The motor which runs at synchronous speed is known as the synchronous motor. The synchronous speed is the constant speed at which the motor generates the electromotive force. The synchronous motor is used for converting the electrical energy into mechanical energy.
he stator and rotor are the two main parts of the synchronous motor. The stator is the stationary part, and the rotor is the rotating part of the machine. The three-phase AC supply is given to the stator of the motor.
This presentation provides information about Synchronous Motor.
Speed control of Three phase Induction motor using AC voltage regulatorShivagee Raj
The role of AC Voltage Regulator in speed control of three phase Induction Motor is to vary the supply voltage which in turn, changes the speed of motor .
Industrial Star Delta Starter for a 3-Phase Induction Motorelprocus
The most basic feature of an Induction motor is its self starting mechanism. Due to the rotating magnetic field, an emf is induced in the rotor, because of which current starts flowing in the rotor.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
1. UNIT III
ROTOR CONTROLLED INDUCTION MOTOR
DRIVES
SYLLABUS:
STATIC ROTOR RESISTANCE CONTROL
INJECTION OF VOLTAGE IN THE ROTOR CIRCUIT
STATIC SCHERIBIUS DRIVES
POWER FACTOR CONSIDERATIONS
MODIFIED KRAMMER DRIVE
2. Introduction
The portion of air gap power which is not
converted into mechanical power is called slip
power
Slip rings allow easy recovery of the slip
power
It can be electronically controlled to control
the speed of the motor.
3. Introduction
The oldest and simplest technique to invoke this
slip-power recovery induction motor speed control
is to mechanically vary the rotor resistance
Rotor resistance cotrol
.
4. Slip-power recovery drives - applications
Large-capacity pumps and fan drives
Variable-speed wind energy systems
Shipboard VSCF (variable-speed/constant
frequency) systems
Variable speed hydro-pumps/generators
Utility system flywheel energy storage
systems
5. Speed Control by Rotor Rheostat
The torque-slip equation for an induction
motor is given by:
2
2 2 2
3 .
2 / ( )
sr
e
e s r e ls lr
VRP
T
s R R s L L
7. Speed Control by Rotor Rheostat
(cont’d)
1. Very simple,
2. Low cost
3. Good power factor
4. High torque to current ratio
5. Wide range of speed
6. Including starting and braking
7. It is also very inefficient because the slip
energy is wasted in the rotor resistance.
8. Static Rotor Rheostat control
It is also very inefficient because the slip
energy is wasted in the rotor resistance
9. Types of slip power recovery
schemes
Instead of wasting the slip power in the
rotor circuit resistance, a better approach
is to convert it to ac line power and return
it back to the line.
Static Kramer Drive - only allows
operation at sub-synchronous speed.
Static Scherbius Drive - allows operation
above and below synchronous speed.
11. Static Kramer Drive (cont’d)
The machine air gap flux is constant.
The rotor current is ideally a 6-step wave
in phase with the rotor voltage.
12. Static Kramer Drive-phasor diagram
The motor fundamental phasor diagram
referred to the stator is as shown
Vs = stator phase
voltage,
Is=stator current,
Irf’ = fundamental rotor
current referred to the
stator,
g = air gap flux,
Im=magnetizing current,
=PF angle.
13. Static Kramer Drive (cont’d)
Voltage Vd is given by:
where s=per unit slip,
VL= stator line voltage
n1=stator-to-rotor turns ratio.
The inverter dc voltage VI is given by:
where n2=transformer turns ratio
=inverter firing angle.
1
1.35 L
d
sV
V
n
2
1.35 cosL
I
V
V
n
14. Static Kramer Drive (cont’d)
the torque will be expressed as:
1
1.35
2
L
e d
e
VP
T I
n
15. Static Kramer Drive (cont’d)
The fundamental component of the rotor
current lags the rotor phase voltage by r
because of a commutation overlap angle .
16. Static Kramer Drive (cont’d)
At zero speed (s=1) the motor acts as a
transformer and all the real power is
transferred back to the line (neglecting
losses).
The motor and inverter only consume
reactive power.
At synchronous speed (s=0) the power factor
is the lowest .
Power factor increases as slip increases.
17. Static Kramer Drive-starting
methods
The motor is started with switch 1 closed and
switches 2 and 3 open.
As the motor builds up speed, switches 2 and 3
are sequentially closed
19. Harmonics in a Static Kramer Drive
The rectification of slip-power causes
harmonic currents in the rotor which are
reflected back into the stator.
This results in increased machine losses.
20. Power Factor Improvement
The static Kramer drive is characterized
by poor line PF because of phase
controlled inverter.
One scheme to improve PF is the
commutator-less Kramer drive
22. Modified Kramer drive(commutator
less kramer drive)
The slip power taken from the rotor
for speed control by converting it to
mechanical power in an auxiliary
motor mounted on the induction
motor shaft
The mechanical power produced by
the auxiliary motor supplements the
main motor power
23. Modified Kramer drive(commutator
less kramer drive)
Better power factor
Lower harmonic content
Electric power not feed back to the
line
Problems associated with the feed
back of power are also eliminated.
27. Static Scherbius Drive (cont’d)
Voltage Vd is given by:
where s=per unit slip,
VL= stator line voltage
n1=stator-to-rotor turns ratio.
The inverter Output ac voltage VI is
given by
where n2=transformer turns ratio
=inverter firing angle.
1
1.35 L
d
sV
V
n
2
1.35 cosL
I
V
V
n
29. Static Scherbius Drive (cont’d)
1
1.35
2
L
e d
e
VP
T I
n
Torque is approximately proportional to
dc link current since fundamental rotor
current is proportional to dc link current
31. Power factor considerations
All the phasors are reffered to the stator or line side
Vs = stator phase voltage,
Is=stator current,
Ir’ = fundamental rotor current
referred to the stator,
g = air gap flux,
Im=magnetizing current,
COS s= Motor PF
COS L1 = Fundamental drive PF
32. Power factor considerations
(conclusions from the phasor diagram)
The drive power factor is maximized when
“aT’’ is chosen to obtain the drive operation
at the maximum permissible firing angle at
the lowest speed
The narrower speed range
The greater the power factor
33. INJECTION OF VOLTAGE IN THE ROTOR CIRCUIT
The speed control of three-phase slip-
ring induction motor can be done using
injected EMF in the rotor circuit.
In the Schrage motor slip frequency
EMF is produced and injected into
secondary winding on the stator by
means of brushes.
34. INJECTION OF VOLTAGE IN THE ROTOR CIRCUIT
Equivalent circuit of induction motor with injected
EMF in rotor circuit
35. INJECTION OF VOLTAGE IN THE ROTOR CIRCUIT
Under steady state condition,
• Injected EMF referred to stator.
•The rotor quantities are referred to stator side.
36. INJECTION OF VOLTAGE IN THE ROTOR
CIRCUIT
The rotor voltage referred to stator is
38. INJECTION OF VOLTAGE IN THE ROTOR CIRCUIT
The injected EMF is having slip frequency,
It may have phase difference with the rotor
voltage.
The machine can be made to run in sub- and
super-synchronous speed apart from normal
induction motor operation.