The document presents information on deep bar and double cage rotors for induction motors. Deep bar rotors have bars made of multiple parallel layers to provide high starting torque through unequal current distribution across layers while maintaining efficiency at normal speeds. Double cage rotors contain an outer cage of high resistance material and an inner cage of low resistance material to generate high starting torque from the outer cage and torque at normal speeds from the inner cage. Such rotors allow induction motors to meet the needs of high starting torque applications.
THIS PPT MAINLY DISCUSS ABOUT DOUBLE CAGE INDUCTION MOTOR AND IT'S CONSTRUCTION AND THIS PPT MAINLY CONTAINS THE DIFFERENT CHARACTERISTICS OF THE MACHINE IN VARIOUS FACTORS ANTHE PLOTTINGS ARE ALSO WE CAN SEE IN THIS PPT SO IT IS SO USEFUL TO ELECTRICAL MACHINES STUDENTS
A reluctance motor is a type of electric motor that induces non-permanent magnetic poles on the ferromagnetic rotor. The rotor does not have any windings. It generates torque through magnetic reluctance.
Reluctance motor sub types include synchronous, variable, switched and variable stepping.
Reluctance motors can deliver high power density at low cost, making them attractive for many applications. Disadvantages include high torque ripple (the difference between maximum and minimum torque during one revolution) when operated at low speed, and noise due to torque ripple.
THIS PPT MAINLY DISCUSS ABOUT DOUBLE CAGE INDUCTION MOTOR AND IT'S CONSTRUCTION AND THIS PPT MAINLY CONTAINS THE DIFFERENT CHARACTERISTICS OF THE MACHINE IN VARIOUS FACTORS ANTHE PLOTTINGS ARE ALSO WE CAN SEE IN THIS PPT SO IT IS SO USEFUL TO ELECTRICAL MACHINES STUDENTS
A reluctance motor is a type of electric motor that induces non-permanent magnetic poles on the ferromagnetic rotor. The rotor does not have any windings. It generates torque through magnetic reluctance.
Reluctance motor sub types include synchronous, variable, switched and variable stepping.
Reluctance motors can deliver high power density at low cost, making them attractive for many applications. Disadvantages include high torque ripple (the difference between maximum and minimum torque during one revolution) when operated at low speed, and noise due to torque ripple.
An induction is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.
Everywhere DC motors are used in large applications, the use of drives are very necessary for the smooth running and operating of these motors. The DC motor drives are used mainly for good speed regulation, frequent starting, braking and reversing.
An induction is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.
Everywhere DC motors are used in large applications, the use of drives are very necessary for the smooth running and operating of these motors. The DC motor drives are used mainly for good speed regulation, frequent starting, braking and reversing.
1000 HP Slip Ring Type Induction Motor and its starter (lrs{LIQUID RESISTANCE...Mukesh Bhol
* Operation & Maintenance of 1000 HP Motor & LRS.
* Function between 1000 HP Motor & LRS
* Connection Diagram for 1000 HP Motor & LRS
* Troubleshooting Ideas
* The Main Causes of Sparking at the slipring are.
COMPARISON BETWEEN SALIENT POLE AND CYLINDRICAL POLE ROTOR|DAY 17|SIMPLE TRIC...Prasant Kumar
#COMPARISON_BETWEEN_SALIENT_POLE_CYLINDRICAL_POLE ROTOR
#Difference_between_salient_pole_non _salient _pole rotor
#salient_pole_rotor
#cylindrical_pole_rotor
#synchronous _machine
# SYNCHRONOUS_MOTOR_STARTING_METHODS
#DAMPER_WINDING
#PONY_MOTOR
#SYNCHRONOUS_MOTOR_START करने के_METHODS
#STARTING_METHODS_OF_SYNCHRONOUS_MOTOR
#SYNCHRONOUS_MACHINE
#WHY_SYNCHRONOUS_MOTOR_IS_ NOT_SELF_ START
#AUXILLARY_MOTOR
#SAI_ACADEMY_OF_ELECTRICAL_ENGINEERING
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#Topic - ELECTRICAL TRANSFORMER
# Link of all sessions are.
DAY 1 (Need/Definition)
https://youtu.be/BvaykFJ_NoE
DAY 2 (Working principle and Construction)
https://youtu.be/06rgxocihaM
DAY 3 (EMF equation and Turns Ratio)
https://youtu.be/g7e5xBPmv3Y
DAY 4 (Classification of Transformer)
https://youtu.be/6NP5L4MlvY4
DAY 5 ( Ideal and practical transformer on no load)
(Equivalent Transformer)
https://youtu.be/6LCLQC1p3lg
DAY 6 ( Losses in Transformer)
https://youtu.be/ObYNiGgd3hA
DAY 7 (O.C. and S.C. test)
https://youtu.be/8WiJRawHiTce/6LCLQC1p3lg
DAY 8 (Voltage Regulation & Efficiency)
https://youtu.be/6LCLQC1p3lg
DAY 9 (Zero Lecture)
https://youtu.be/N4xWOwgi8I4
DAY 10 (Classification of machine)
https://youtu.be/bmxnU5rC5m4
Construction of Machine
https://youtu.be/34mpphDk3gg
Working Principle of Synchronous Generator & Synchronous Motor
https://youtu.be/bkgf72M8BCY
Working Principle of Induction Motor
https://youtu.be/Lj_iQBoRiK0
Emf equation of Dc machine
https://youtu.be/RRSy-LTK4bI
Emf equation of Synchronous generator
https://youtu.be/tJ56sGFJw-I
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.
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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.
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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.
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1. PRESENTATION ON
DEEP BAR & DOUBLE CAGE
ROTORS
PRESENTED BY-
Manish Sahu
EE-5th SEMESTER
ROLL NO:1013123
2. Need for Deep-Bar and Double-Cage rotor
Deep-Bar rotors
Torque-Slip relationship
Double-Cage rotors
Equivalent circuit diagram
Applications
Conclusion
3. What is the need?
Conventional Squirrel Cage motors suffer from the
disadvantages of low starting torque because of low rotor
resistance.
The starting torque can be increased by using the bar
material of higher resistivity.
However high rotor resistance reduces the full-load speed,
increases rotor ohmic loss and lower efficiency.
Therefore in order to achieve high starting torque without
effecting the efficiency, the rotor resistance is made higher
at the time of starting & low under normal operating
conditions.
4. In wound rotor induction motors these conditions are met
by connecting external resistance in rotor circuit at the
time of starting & resistances are cut out in steps as the
motor attains its normal speed.
In squirrel cage motor this is not feasible as the
conductors are short-circuited by end rings. In order to
attain the above desired conditions following types of
rotors are used:-
Deep bar rotor.
Double cage rotor.
5. Figure below shows a cage rotor with deep and
narrow bars. A bar may be assumed to be made up
of number of narrow layers connected in parallel.
It is seen that the top most layer element ‘A’ is
linked with minimum leakage
flux and therefore its leakage
inductance is minimum.
On the other hand, the bottom
layer ‘C’ links maximum flux,
therefore its leakage inductance
is maximum.
6. At starting the rotor frequency is equal to the supply
frequency. The bottom layer element ‘C’ offers more
impedance to the current flow then upper layer ‘A’.
Therefore the maximum current flows through the
top layer and minimum through bottom layer. This
unequal current distribution causes the effective rotor
resistance to increase.
With a high rotor resistance at starting condition, the
starting torque is relatively high & starting current is
low as desired.
7. Now under normal operating conditions, the slip and the rotor
frequency are very small. The reactance of all the layers are
small compared to their resistances.
The impedances of all the layers are nearly equal, so current
flows through all the parts
of the bar equally.
The resulting large cross-section
area makes rotor resistance small,
resulting in good efficiency at low
slips.
8. The slip-torque curve for deep-bar rotor is shown
below along with the deep-bar stator. Torque/Slip curve
Deep-Bar rotor.
9. An induction motor with two rotor windings or cages is used for
obtaining high starting torque at low current.
The stator of a double cage induction motor is similar to that of
ordinary induction motor. In double
cage rotor there are two
layers of bars as shown:
The outer cage bars have a
smaller cross-sectional area
than the inner bars and are
made of high resistivity
materials like brass etc.
10. The inner cage bars are made up of low resistance
material like copper. Thus the resistance of outer cage
is greater than that of inner cage.
There is a slit between the top and bottom slot. This
increases premeance for leakage flux around the
inner cage bars.
Thus the leakage flux linking the inner cage winding
is much larger than that of outer cage. The inner cage
winding, therefore has a greater self inductance.
11. At starting voltage induced in the rotor is same as the
supply frequency. Hence the leakage reactance of the inner
cage winding is much larger than of the outer cage.
Therefore most of the starting current is flowing in the outer
cage winding which offer low impedance to current flow.
The high resistance outer cage winding
therefore develops high starting torque.
As the rotor speed increases,
the frequency of rotor emf decreases.
12. At normal speed, the leakage reactance of both the winding
becomes negligibly small.
The rotor current division between the two cages is governed
mainly by their resistances.
Since the resistance of the outer cage is about 5 to 6 times that
of inner cage, most of the rotor current flows through the inner
cage.
Hence under normal operating speed, torque developed mainly
by low resistance inner cage.
Double cage rotor
13.
14. The approximate equivalent circuit of double cage rotor
induction motor is shown below. Though the two cages are
somewhat coupled magnetically, they can be treated as
independent for simplicity and it gives approximately same
results.
I2ru' and I2rl' are the currents in the upper and lower cages
respectively referred to the stator. R2u'and R2l' are the resistance
of upper and lower cages referred to the stator whereas X2u’ and
X2l’ are leakage reactances of the two cages referred to the stator
of the motor.
15. Applications
Used in water pumps for various Irrigational and Industrial
purposes.
Used in Lathe machines and Drilling machines.
16. It is evident by now that for low starting torque
requirement, low-cost ordinary squirrel-cage
construction is employed.
A deep-bar construction is adopted for higher
starting torque applications and double-cage for
still higher starting torque needs.
For large size motors with stringent starting torque
needs, the most expensive slip-ring construction is
used.
17. I.J. Nagrath and D.P. Kothari,’Electric Machines’, 4th
edition., 2010, Tata McGraw Hill Education Pvt Ltd.
B.R. Gupta & Vandana Singhal, “Fundamentals of Electrical
Machines, New Age International, 2009.
http://www.electrical4u.com/squirrel-cage-
rotors/(04/09/2014)
http://www.electrical4u.com/squirrel-cage-double-and-
deep-bar-rotors/(04/09/2014)
http://www.powerelectricalblog.com/2007/04/constructio
n-of-rotors/induction-machine.html(04/09/2014)