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Pet of the week: Dingo - Duration: 2:00.
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Speed Control of Induction Motor - AC Motor Speed Control Methods - Duration: 5:43.
An induction motor is basically a constant speed motor, that means, for the entire loading
range, change in speed of the motor is quite small.
Speed of a DC shunt motor can be varied very easily with good efficiency, but in case of
Induction motors, speed reduction is accompanied by a corresponding loss of efficiency and
poor power factor.
As induction motors are widely being used, their speed control may be required in many
applications.
In this video I will go to brief you Different speed control methods of induction motor.
If you want to learn about Speed Control of DC Motor, checkout my another video in description
Below.
Different speed control methods of induction motor are explained below.
Following are the May two type of controlling arrangement which need to consider by controlling
Induction motors.
Speed control with respect to stator side of the induction motor.
Speed control with respect to rotor side of the induction motor.
The speed control of induction motor by considering to control on stator side can also subdivide
into several speed controlling methods such as.
By changing the supply voltage of the motor.
Changing the stator pole numbers of the motor.
Changing the frequency of the supply side of the motor.
By changing the supply voltage of the motor.
As can be seen from Equation, the torque developed by an induction motor varies as square of
the voltage applied to its stator terminals.
Thus by varying the applied voltage, the electromagnetic torque developed by the motor can be varied.
This method is generally used for small squirrel-cage motors where cost is an important criterion
and efficiency is not.
However, this method has rather limited range of speed control.
Changing the stator pole numbers of the motor.
The primary factor in determining the speed of an induction motor is the number of poles,
given by the below formula;
Ns = Synchronous speed, in revolutions per minute.
f = AC power frequency.
p = Number of poles per phase winding.
From the above formula, Pole changing in induction machine can be done using a Dahlander motor
also known as a pole changing motor.
Pole changing can be used to achieve different speeds in induction machine by switching the
configuration of the electrical stator windings in the ratio of 2:1, indirectly adding or
removing poles and thus varying the rotor speed.
The number of stator poles can be changed by, multiple stator winding, method of consequent
poles, pole amplitude modulation.
Changing the frequency of the supply side of the motor.
By changing the supply frequency, the motor synchronous speed can be altered and thus
the torque-speed of a three- phase induction motor can be controlled.
The synchronous speed of the motor at rated conditions is known as the base speed.
By using variable frequency control, it is possible to adjust the speed of the motor
either above or below the base speed.
Increase in frequency increases the torque-speed relation and a decrease in frequency decreases
the torque-speed relation of the motor.
The speed control of induction motor by considering to control on rotor side can subdivide into
several speed controlling methods such as.
Adding an external resistant into rotor side circuit.
Applying cascade connection.
Injecting emf into rotor side circuit of the motor.
Adding an external resistant into rotor side circuit.
This method is applicable only the wound rotor induction motors.
Speed variation can be obtained by inserting external resistance in the rotor circuit.
External resistances are placed in series with the rotor windings during starting to
limit the starting current.
Without the external resistances, the starting currents are many times the rated currents.
Depending on the size of the machine, it can draw 300% to over 900% of the full-load current.
Once the motor is started, the external resistance can be cut out to obtain high torque throughout
the accelerating range.
Applying cascade connection.
In this cascade operation method of induction motor speed controlling there are two motors
are mount on the same shaft of the motor and run at same speed.
One motor is connected to three-phase supply and other is work from the feed induced emf
of the first motor through slip rings.
By using this method different speed can apply for induction motor and speed can control.
Injecting emf into rotor side circuit of the motor.
In this induction, motor speed control method external voltages add into the rotor circuit
of the motor and the frequency must be same as slip frequency.
So injecting emf in opposite phase of the rotor increase the rotor resistance.
By that, this method can use to speed controlling of the induction motor.
Dear viewers Thanks for watching the video, any question write in the comment box.
Don't forget to like and share.
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5 Tricks For Getting Rid Of Pesky Wardrobe Odors | How To Get Rid Of Wardrobe Smell - Remedies One - Duration: 3:40.
as well as helping to eliminate the humidity that can build up in wardrobes
sea-salt also gets rid of nasty odors thanks to
its antibacterial and antifungal properties today's video will discuss
five tricks for getting rid of pesky wardrobe odors before you watch this
video please take a moment to subscribe our YouTube channel by clicking the
subscribe button then tap the Bell icon so you will be the first to know when we
post new videos daily
unfortunately cupboards wardrobes and closets are areas of the home that tend
to accumulate unpleasant odors due to a buildup of humidity here we want to
share the five best tricks with you don't hesitate to try them out next time
you're confronted with an unpleasant smell when you open your wardrobe get
ready 1 lavender the delicious scent of lavender flowers can keep cabinets and
clothes free from the smell of mold or moisture this natural plant neutralizes
strong aromas and prevents them from building up in closed spaces how to use
get your hands on some small cloth bags and simply fill them with chopped
lavender flowers then place the bags inside your cabinets or closets leave
them in sight until the odor of mold completely disappears 2 white vinegar
the antifungal and antibacterial properties of white vinegar mean it's a
great agent for neutralizing the odor of moisture that tends to build up in
drawers and closets how to use remove all your clothes from the closet then
moisten a cloth with white vinegar and rub it over the entire interior when
you're done leave the closet doors open to allow it to air for a couple of hours
until the interior is completely dry 3 baking soda the absorbent and
antibacterial properties of baking soda help to remove pesky wardrobe odors how
to use fill a small cloth bag with baking soda and place it in one of the
corners of the closet alternatively pour the baking soda into a dish and simply
place it on the floor of the Wardrobe you want to clean you can also just
sprinkle the powder over the interiors of the furniture and let it act for 48
hours for lemon juice a natural disinfectant made of lemon juice serves
to eliminate odors from your cupboards in addition it gets rid of the mold
stains and dust that can cling to their walls how to use dilute the juice of a
lemon in warm water and rub the mixture onto the walls of your cabinet with the
help of a microfiber cloth then simply leave the Wardrobe doors open for a
couple of hours and close it up when the interior is dry five coffee grounds if
you want to absorb the humidity that is built up inside your closets not to
mention leave them smelling delicious then coffee grounds are a great option
how to use sprinkle coffee grounds on the floor of your closet and leave to
work for 48 hours for a more lasting effect pour coffee grounds into small
cloth bags and place one in each drawer of the cabinet which method do you like
let me know in our comment section below if you like this video give it a thumbs
up and share with your friends for more daily tips subscribe to our channel
below thank you
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주영훈 경호실장|조회수4.989.283 - Duration: 7:53.
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►যে কোন ছবিকে আকর্ষনীয় করে তুলুন Auto Blur App দিয়ে Android mobile tips - Duration: 2:45.
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Uomini e Donne: 'Gemma per Natale ti regalo un gigolo', la Galgani accetterà il dono? - Duration: 3:10.
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Alps 2017 - Col du Télégraphe - uphill from Saint-Michel-de-Maurienne - Duration: 5:39.
An ever returning feeling during this motorcycle holiday : my motorbike friend swiftly follows me overtaking :-)
Time for a refreshing drink
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황승환 아내 이혼이유 묘덕선사 사연|조회수4.989.283 - Duration: 7:53.
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Homescapes Level 187 - How to complete Level 187 on Homescapes - Duration: 3:48.
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