Premium Essay

Induction Motors

In: Computers and Technology

Submitted By asha123
Words 2662
Pages 11
Introduction to Machines &
Power Systems
(EPM1076)

Chapter 4c

Synchronous Machines

Objectives:
In this chapter the following topics will be discussed.
 Introduction to synchronous generator
 Construction details

 Principle of operation and emf equation
 Equivalent circuit and voltage regulation
 Short-circuit and open-circuit tests
 Parallel operation
 Synchronizing procedures

Chapter IV

EPM1076

2

Introduction to Synchronous Machines
A synchronous machine is an ac rotating machine whose speed under steady state condition is proportional to the frequency of the current in its armature.
The magnetic field created by the armature currents rotates at the same speed as that created by the field current on the rotor, which is rotating at the synchronous speed and a steady torque.

Synchronous machines are commonly used as generators especially for large power systems, such as turbine generators and hydroelectric generators in the grid power supply.
Because the rotor speed is proportional to the frequency of excitation, synchronous motors can be used in situations where constant speed drive is required.

Chapter IV

EPM1076

3

Chapter IV

EPM1076

4

Angle in Electrical and Mechanical Unit
-For 2 pole machine, when the rotor rotates for one revolution, the induce emf varies for one cycle. i.e. θ
= θm, (refer to figure 2)
-Where θ is the angle in electrical degrees or radians and θm is the mechanical angle.
- For a 4 pole machine, as the rotor rotates for one revolution (θm = 2π), the induced emf varies for two cycles (θ = 4π) (refer to figure 2)
-Hence, θ = 2θm or in general, θ = (P/2) θm (Eqn 1)
-Where P = number of pole.

Chapter IV

EPM1076

5

Figure 2

2 pole

4 pole

back
Chapter IV

EPM1076

6

By taking derivatives on both side of Eqn 1. ω = (P/2) ωm
Where ω is…...

Similar Documents

Free Essay

Speed Control of Induction Motor Using Fuzzy Logic and Pll

...Introduction 1.1 Background AC induction motors are being applied today to a wider range of applications requiring variable speed as they are the leading elements to convert electrical energy into mechanical energy. They are being used as actuators in various industrial processes, robotics, house hold appliances (generally single phase induction motor) and other similar applications. The reason for its day by day increasing popularity can be primarily attributed to its robust construction, simplicity in design and cost effectiveness. Also, induction motors are proved to be more reliable than DC motor. Generally, variable speed drives for induction motor requires wide operating range of speed and fast torque response, regardless of the load variations. Also, the conventional controllers have to linearize the non-linear system of induction motor in order to calculate the parameters, which is almost impossible to obtain a perfect non-linear model. Hence the values of the parameters that are obtained from it are thereby approximate. This leads us to more advanced control methods to meet the real demand. To overcome the complexities of conventional controllers, fuzzy logic controller have been implemented in many motor applications. A Fuzzy Logic Controller (FLC) is incorporated for combination with Phase Locked Loop (PLL) for precise and robust speed of induction motor. The fuzzy logic controller is used to pull the motor speed into the locking range of PLL.......

Words: 1757 - Pages: 8

Free Essay

Philosophy - Induction

...absolutely proven. Inductive reasoning is not without worth because it leads humanity to many understandings. As Appiah said, “If we use induction with a predicate that is reliable, we are using a belief-forming process, and so according to reliabilism, we are acquiring knowledge.” (Appiah 163). This shows that inductive reasoning is not insignificant and that our hypotheses based on it are, to some extent, dependable. While on the one hand, Hume would argue that inductive reasoning cannot be justified and on the other Appiah would argue that inductive reasoning is plausible, many people would fit somewhere in between these two theories. One such theory in between the two polar arguments has been brought by Nelson Goodman. His belief is that inductive reasoning is sometimes credible, yet sometimes not credible. As Appiah stated about Goodman, “Goodman’s own suggestion for dealing with the new riddle of induction is that we should rely on enumerative induction in certain cases, cases where the predicates involved” (Appiah 162). Though, even this argument shows difficulty in being justified. For, if we use predicates from the past, we would believe that because it had worked out in the past then it would work out in the future. However, Goodman holds another important point. He would argue that not each generalization due to induction would be able to be justified by particular instances, which is extremely important in understanding justifiability of inductive......

Words: 1426 - Pages: 6

Premium Essay

Doc Induction

...application forms available to study before the interviews take place. A short list must be made up of suitable candidates, so that the interviews do not have to take place a second time, with new job advertisements being placed. The skills required should have been identified through the process of job analysis, description and specification. It is important then to identify ways of testing whether candidates meet these requirements. Testing this out may involve: interviewing candidates asking them to get involved in simulated work scenarios asking them to provide samples of previous work getting them to fill in personality and intelligence tests giving them real work simulations to test their abilities. Induction and training New workers in a firm are usually given an induction programme in which they meet other workers and are shown the skills they must learn. Generally, the first few days at work will simply involve observation, with an experienced worker showing the 'new hand' the ropes. Many large firms will have a detailed training scheme, which is done on an 'in-house' basis. This is particularly true of larger public companies such as banks and insurance companies. In conjunction with this, staff may be encouraged to attend college courses to learn new skills and get new qualifications. Training thus takes place in the following ways: 1. On the job - learning skills through experience at work 2. Off the job - learning through attending courses. Promotion......

Words: 1845 - Pages: 8

Premium Essay

A Personalised Induction

...“A personalised induction will always be more effective” Discuss. Base your answer on theoretical concepts and techniques presented in class Module 2 Nicola Pepper Tutor: Jaswinder Challi Word count:2106 Introduction This paper will discuss methods and techniques used to personalise screeds to suit clients that we are working with. How we decide which modality to use on our clients, how important an initial consultation can be and my argument for using personalised screeds. I will discuss the factors involved in creating personalised screeds, and the benefits of creating a personalised screed for clients. Using different modalities and whether a script should be authoritative or permissive. The more personalised hypnotherapy is the more effective it will be, as whilst all of us appear quite similar, we are different in many ways. We have different likes and dislike; come from different cultural backgrounds; and will have been brought up in environments that have provided us with different outlooks, values and perspectives. If the best possible results are to be obtained in a hypnotherapy session there is a need to work closely with individuals in order to identify their likes and dislikes as well as their personality. In this way we can gain their trust and assist them in reaching a deep state of hypnosis. When we communicate with people we do not only use words but body language, with tone also playing a large part in what...

Words: 2094 - Pages: 9

Premium Essay

Induction Tasks

... | | | | | | | |INDUCTION TASKS | | | | | | | |JULY-SEPTEMBER 2014 | | | | | INTRODUCTION • The following Induction Tasks have been set to support and shape your learning in your training school. • Discuss with your mentor, classteacher, professional tutor, School Direct Lead how best to complete these tasks to take into account both your personal needs and prior experiences. • Each task begins with some open ended......

Words: 1927 - Pages: 8

Premium Essay

Deduction and Induction

...1 The Induction-Deduction Opposition: Ambiguities and Complexities of the Didactic Reality Wilfried Decoo Published in IRAL: International Review of Applied Linguistics, vol. 34, n° 2 (May 1996), 95-118. ("didactic" = pertaining to teaching and learning in a school context) Abstract An analysis of some of the scientific literature reveals that the terms "induction" and "deduction" often point to various concepts. A number of modalities need to be discerned, especially in the realm of "induction". Experimental comparisons of different methodological approaches may also neglect, to some extent, the complexities of what is really taking place in the classroom setting. The purpose of this article is not to take sides in the methodological controversy, but to contribute to a greater awareness of terminology identification and of the tangents, plural forms and crossings between didactic strategies that draw on "induction" or "deduction". Les termes "induction" et "déduction", tels qu'une analyse de la littérature scientifique nous les révèle, renvoient souvent à des concepts différents. Il semble utile de discerner les différentes modalités, en particulier dans le domaine de "l'induction". Les comparaisons expérimentales de différentes approches méthodologiques semblent négliger, du moins en partie, les aspects complexes de la réalité en classe. Cet article ne prend pas position dans la controverse méthodologique, mais désire contribuer à une plus grande prise de conscience d'une......

Words: 8498 - Pages: 34

Premium Essay

Electric Motors

...leader in advanced electric motor technologies Remy Electric Motors A New Breed of High Performance Technology A century of experience and innovation has spawned an electric motor with unbridled power density and torque. Innovative HVHTM technology has revolutionized the market. It provides customers with a high-performance motor in a small package that is easily integrated into nearly all hybrid and electric applications. The Remy HVH has proven to be a versatile and reliable workhorse. With over 1 billion miles of proven reliability and powering applications ranging from sports utility vehicles and trucks to large transit buses, this beast has shown it can’t be tamed. Take a closer look inside and see why the Remy HVH electric motor is so powerfully unique. Then give us a call to see how easily we can make an immediate impact on your electric or hybrid application. Superior Patented Technology of the Future A Look Inside Remy HVH Technology High Voltage Hairpin (HVHTM) Remy HVH electric motors owe both their name and exceptional performance to the proprietary High Voltage Hairpin stator windings. In contrast with conventional round-wire windings, the HVH stator winding uses precision-formed rectangular wires. Multiple layers of interlocking “hairpins” produce superior slot fill and shorter end turn space which reduces heat and improves the motor’s torque and power density. Low-Weight, Compact Size Reducing overall size and mass of the motor with HVH technology drives......

Words: 625 - Pages: 3

Free Essay

Induction

...INDUCTION PROGRAMME FOR NEW STAFF SESSION | SUGGESTED CONTENT OF SESSION | * welcome to the organisation and overview of induction process * Person Responsible – HR &Line Manager | * Mission, Vision, values Objectives of work area * All key operational and social areas to be visited. (E.g. Offices, Catering Facilities, Toilets, Locker rooms etc. * Mission statement | * Introduction to other members of staff , Departments and teams * Person Responsible – SMT,HR & Line Manager * | * Go through organisation chart * Discuss roles and responsibilities of staff in general terms. * How they fit into the organisation. | Terms and Conditions * Person Responsible – Line Manager | * Ensure new start has viewed and understood information contained in the Information for New Employees this contains important information on terms and conditions. | * Performance Standards and Job Specific Training and DevelopmentPerson Responsible – Line Manager | * Define goals, objectives and expectations * Outline the use of PDR performance development Reviews to determine development needs. * For new staff the Probation Policy will apply * Probations review after 3 months | Policies......

Words: 281 - Pages: 2

Premium Essay

Inductions

...INDUCTION (Ask student if anybody has been to a new place either for a job or for social event) Foot and Cook (2008) define Induction “as the process of helping new employees settle quickly into their job so that they soon become an efficient and productive employee”. CIPD factsheet 2014 are of the view that “‘induction’ is generally used in a workplace context to describe the whole process whereby employees adjust to their jobs and working environment”. Stirzaker (2004) found in her research on staff induction in international schools that induction must be a continuous process and not a one off event. The length and nature of the induction process depends on the complexity of the job and the background of the new employee. One size does not fit all - a standardised induction course is unlikely to satisfy anyone. “Induction is best seen as a process that commences before the employee starts work and extends through the first two or three months of employment. In the very best instances the new recruit is deliberately eased into the new job” (Lashley, Conrad, & Warwick 2002) Induction process can be formal or informal. Formal Induction – Normally associated with large organisations, who usually have a laid process of inducting the new recruit into the organisation Informal Induction - Purpose of Induction * CIPD opine that the purpose of induction is to ensure the effective integration of staff into or across the organisation for the benefit of both......

Words: 1358 - Pages: 6

Premium Essay

Motor

...Chapter 1 INTRODUCTION 1.1 Background of the Study A synchronous electric motor is an AC motor distinguished by a rotor spinning with coils passing magnets at the same rate as the power supply frequency and resulting rotating magnetic field which drives it. Another way of saying this is that it does not rely on slip under usual operating conditions and as a result, produces torque at synchronous speed. Synchronous motors can be contrasted with an induction, which must slip in order to produce torque. They operate synchronously with line frequency. As with squirrel-cage induction motors, speed is determined by the number of pairs of poles and the line frequency. Synchronous motors are available in sub-fractional self-excited sizes to high-horsepower direct-current excited industrial sizes. In the fractional horsepower range, most synchronous motors are used where precise constant speed is required. In high-horsepower industrial sizes, the synchronous motor provides two important functions. First, it is a highly efficient means of converting ac energy to work. Second, it can operate at leading or unity power factor and thereby provide power-factor correction. The operation of a synchronous motor is simple to imagine. The armature winding, when excited by a poly-phase (usually 3-phase) supply, creates a rotating magnetic field inside the motor. The field winding, which acts as a permanent magnet, simply locks in with the rotating magnetic field and rotates along......

Words: 3243 - Pages: 13

Premium Essay

Speed Control Induction Motor

...Speed Control of Induction Motor using Fuzzy Logic Approach A PROJECT THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Bachelor of Technology In Electrical Engineering By Varuneet Varun (Roll 108EE011) G. Bhargavi (Roll 108EE026) Suneet Nayak (Roll 108EE044) Under Supervision of Prof. Kanungo Barada Mohanty Department of Electrical Engineering National Institute of Technology, Rourkela Rourkela- 769008, Odisha © 2011 - 2012 National Institute of Technology Rourkela Certificate This is to certify that the work contained in this thesis, titled “SPEED CONTROL OF INDUCTION MOTOR USING FUZZY LOGIC APPROACH” submitted by Varuneet Varun, G. Bhargavi and Suneet Nayak is an authentic work that has been carried out by them under my supervision and guidance in partial fulfillment for the requirement for the award of Bachelor of Technology Degree in Electrical Engineering at National Institute of Technology, Rourkela. To the best of my knowledge, the matter embodied in the thesis has not been submitted to any other University/ Institute for the award of any Degree or Diploma. Place: Rourkela Date: 11th May, 2012 Dr. Kanungo Barada Mohanty Associate Professor Department of Electrical Engineering National Institute of Technology Rourkela – 769008 i Acknowledgment We are grateful to The Department of Electrical Engineering for giving us the opportunity to carry out this project, which is an......

Words: 17434 - Pages: 70

Premium Essay

A Personalised Induction

... “A personalised induction will always be more effective” In this essay I will discuss the importance of a personalised induction in relaxation and if it is always more effective. As we know all individuals are different, not just the outward appearance but the inward person to. People have different characters and personalities built on their genes influences through life experiences, friends, school and age. It is important when we first meet the client to get as much information and history as possible. The client must also be made aware of how hypnotherapy works so that mutual realistic expectations can be agreed, for example; if someone wants to lose weight, it is about changing their eating habits and retraining their subconscious mind, not a quick fix. All of the information gathered will give a clearer picture about their likes, dislikes, background, hobbies, fears, allergies and history of any illness’s and medication past and present. This will assist in not only finding out about their preferences and their modalities but will also be a time when anxiety levels can be reduced, a rapport and the trust between client and therapist can be built. Mutual trust, respect, belief and empathy are key to a successful initial meeting. This information also assists the therapist in determining an individual’s personality. A person’s preferences and modalities can change in order to a situation that they find themselves in. So you can see why the induction has to be......

Words: 2088 - Pages: 9

Free Essay

Five Phase Induction Motor

...Design of Five Phase Induction Motor Sanket M. Bhimgade#1 Swapnil C. Chaudhari#2 Roshan B. Durge#3 Vabeihrohnei Chozah#4 Parag P. Salunke#5 Department of Electrical Engineering Dr. Babasaheb Ambedkar Technological University, Lonere, Raigad (MS - 402 103) sanketbhimgade@gmail.com , 2swapnil.28492@gmail.com , 3roshan.durge16@gmail.com , 4pawhrohnei@gmail.com , 1 Abstract: The conversion of electrical energy into mechanical energy has been and continuous to be a dominant form of power transmission for industrial purposes. The alternating current (AC) electric induction motor has been an industry workhouse for electromechanical conversion for over 100 years. This paper introduces the fundamental electric and mechanical principles of 5 phase AC induction motor. In this paper, a generalized formula is proposed for the selection of number of slots required for 5-phase alternative current (AC) machine design and the criterion for selecting the starting points of each phases. Keywords: Induction motor. Five phase, Stator winding. current. The power per phase is P = VP IP cosϕ and the total power is the sum of the amount of power in each phase. If the currents are equal and the phase angles are the same as in Fig. 1, then the load on the system is balanced, the current in the neutral is zero and the total power is [1], =3 cos ∅ Or Or = √3 = 1.73 cos ∅ cos ∅ I. INTRODUCTION In general, the induction machines having......

Words: 3545 - Pages: 15

Premium Essay

A Discourse on Induction Motors

...A Review of Induction Motors Pattinson Hayton
 California State University, Long Beach
 College of Engineering
 12/03/2015 Thus far in Energy Conversion and Principles, the topics of direct current, or DC, and synchronous motors have been covered and discussed. A direct current exists in the field windings of both of these motors and an alternating current, or AC, exists in the armature windings of both of these motors. Electrical power is delivered right to the armature of a DC motor using a commutator, or the moving part of the rotary, in these motors. Because of this, a DC motor with this type of connection can also be referred to as a conduction motor. Conversely, if a motor receives power by induction, rather than by conduction, the motor is called an induction motor. An induction motor is therefore a type of transformer that possesses a rotary secondary winding. As discussed previously, both DC and synchronous motors are doubly-fed. An induction motor, however, is a singly-fed motor. With these motors being singly-fed, the construction of is different than that of other motors. These motors do not require slip-rings, a commutator, or brushes. With these components absent from induction motors, it is thus seen that there are no moving contacts between the stator and rotors, which is obviously quite different than the structure of DC and synchronous motors. Induction motors are useful due to their efficiency. The absence of brushes in induction motors eliminates......

Words: 3796 - Pages: 16

Premium Essay

Scheduled Induction

...Nursing 202: Scheduled Induction Mindy C. Grenade Bucks County Community College Spring, 2014 Ms. Bobbie Table of Contents Abstract 3 Body of paper Introduction 4 History 4 Techniques 6 The Bishop Scoring System 7 Indications 8 Contraindications 10 Risks 12 Nursing 12 Conclusion 15 References Abstract Inducing labor has been occurring since before our time. There are two types of labor inductions, scheduled and elective. For purposes of this paper scheduled inductions will be focused on. A scheduled induction is defined as using artificial methods to start the labor process at a specific time. Inductions are performed for many reasons. In most cases scheduled induction are performed because of medical complications to the baby and/or mother. In healthcare, there has been an increase in incidence regarding scheduled inductions related to convenience for the mother as well as for the doctors. To better understand the complexity of scheduled induction the history has to be addressed. What is the reasoning behind changing the natural birthing process? This paper will explain the methods of induction: pharmacological vs. mechanical, and the indications thereof. Nurse’s play a key role in labor and delivery. They have to be prepared to address and treat their patients’ condition, as well as be knowledgeable on the contraindications of this......

Words: 4263 - Pages: 18