Study of Permanent Magnent Synchronous MacnineRajeev Kumar
With respect of designing a PMSG, the permanent magnetic pole lies on the rotor and armature winding are in the inner part of stator that is electrically connected to the load. Armature winding consists of the set of three conductors which has phase difference 120 derg apart to each other and providing a uniform force or torque on the generator’s rotor. To operate PMGS, it is connected to wind turbine through a shaft without gear box and rotate at slow speed. This uniform torque produced by the resultant magnetic flux which induces current in the armature winding. The stator magnetic field combined spatially with rotor magnetic flux and rotates as the same speed of the rotor. So the two magnetic fields synchronously rotate in PGSM to maintain the relative motion of rotor and stator.
Thus the permanent magnets rotates at constant speed without any DC excitation system, which means it has not required any slip rings and contact brushes to make it more reliability or efficient.
This ppt shows the modelling and simulation of permanent magnet synchronous motor by using torque control method.
And this is the most advanced and soffestigated method to control the pmsm motors.
Advantages and Disadvatages of AC/DC MotorFika Khamis
Simple explanation on advantages and disadvantages of AC and DC motor. Focusing on main point only since the slides is for presentation. Originally design by me.
Design of Hollow-Rotor Brushless DC MotorIJPEDS-IAES
This paper discusses about design of hollow-rotor Brushless DC (BLDC)
motor. A conventional BLDC motor has more leakage flux circling at the end
of the permanent magnet that will limit torque. To overcome this problem, a
new BLDC model known as hollow-rotor is proposed. The objective of this
research is to design a hollow-rotor motor that will have higher torque
density compared to conventional BLDC motor using Finite Element Method
(FEM). In addition, performance analysis of the proposed hollow-rotor has
also been carried out. For validation, the result of FEM is compared with the
measurement result. It shows that, the simulation result has good agreement
with the measurement result. For comparison, hollow-rotor shows higher
torque density compared to conventional BLDC motor. As a conclusion, this
paper provides guidelines and analysis in designing high torque hollow-rotor
motor.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
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.
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.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSE
-electrical machine design
1. 1
Seat No.: ________ Enrolment No.______________
GUJARAT TECHNOLOGICAL UNIVERSITY
B. E. - SEMESTER – VI • EXAMINATION – WINTER 2012
Subject code: 160804 Date: 05/01/2013
Subject Name: Electrical Machine Design
Time: 02.30 pm - 05.00 pm Total Marks: 70
Instructions:
1. Attempt any five questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Deduce the expression of m.m.f for the air gap of the armature for the
slotting and ducting.
07
(b) Explain the Real and Apparent flux densities. 07
Q.2 (a) Explain the methods for estimation of m.m.f for tapered teeth. 07
(b) Determine the air gap length of a d.c.machine from the following particulars:
gross length of core=0.12m;number of ducts=one and is 10 mm wide; slot
pitch=25 mm;slot width=10mm;Carter’s co-efficient for slots and
ducts=0.32;gap density at pole centre=0.7wb/m2
;Field m.m.f per pole=3900
A, m.m.f required for iron parts of magnetic circuit=800 A.
07
OR
(b) Derive the expression for the leakage permeance of parallel sided slot. 07
Q.3 (a) Calculate the m.m.f required for the air gap of a machine having core
length=0.32m including 4 ducts of 10 mm each, pole arc=0.19m; slot
pitch=65.4mm; slot opening=5 mm; air gap length=5 mm; flux per pole
=52mWb.Given Carter’s co-efficient is 0.18 for opening/gap=1 and is 0.28
for opening/gap=2.
07
(b) Explain the heating time constant and explain how it can be evaluated from
heating curve.
07
OR
Q.3 (a) The temperature rise of a transformer is 25ο
after one hour and 37.5ο
after
two hours of starting from cold conditions. Calculate its final steady
temperature rise and the heating time constant. If its temperature falls from
the final steady value to 40ο
C in 1.5 hour when disconnected, calculate its
cooling time constant. The ambient temperature is 30ο
C.
07
(b) Explain the methods of estimation of motor rating for variable load drives. 07
Q.4 (a) Derive the expression for the KVA rating of a three phase transformer and
show that the e.m.f per turn Et=K√KVA.
07
(b) Calculate approximate overall dimensions for a 200 KVA, 6600/440V, 50Hz,
3-phase core type transformer. The following data may be assumed: e.m.f per
turn=10 V; maximum flux density=1.3 Wb/m2
; current density =2.5 A/mm2
;
window space factor=0.3, overall height=overall width; stacking
factor=0.9.Use a three stepped core.
Width of largest stampings=0.9d, and
Net iron area=0.6d2
where d is the diameter of circumscribing circle.
07
OR
2. 2
Q.4 (a) Derive the condition for the optimum design of transformer for the minimum
cost and minimum losses.
07
Q.4 (b) Define specific electric loading and magnetic loading and derive the output
equation of d.c.machine.
07
Q.5 (a) Explain the factors affecting the choice of electrical loading. 07
(b) A 350 KW, 500 V, 450 rpm, 6 pole d.c. generator is build with an armature
diameter of 0.87m and a core length of 0.32m.The lap wound armature has
660 conductors. Calculate the specific electric and magnetic loading.
07
OR
Q.5 (a) Discuss the factors that influence the choice of number of poles of a
d.c.machine.
07
(b) Find the suitable number of poles and diameter of the core of a 400 KW,
550V, 180 rpm d.c. Generator having 92% efficiency. Assume an average
flux density in the air gap of about 0.6 wb/m2
and ampere conductors per
meter to be 35000.
07
*************
