HOW TO CONNECT AC MOTOR IN DELTA-STAR …web.sc-celje.si/etie/wp-content/uploads/2018/05/2.pdf ·...

Better Electro-World Slovenian Meeting

March 2018

HOW TO CONNECT AC MOTOR IN DELTA-STAR CONFIGURATION

DELTA TEAM

Andraž Špan, Luka

Farkaš, Urban Mikic,

Žan Dolar, Domen

Romih, Sven Senica


March 2018

How to connect ac motor in delta-star configuration 1

THE PROJECT SUMMARY

E World (Better Electro World) is a project based on

the idea that VET (Vocational Education and Training)

improve the method of learning , if a student

acquires vocational qualifications trough the good

samples of practices on peer learning and project

based implementations. The main reason for this

project is to reduce the educational barriers of VET,

with the purpouse of the student be more successful

and proactive. The idea of this project appears after

finding that participants have a lot needs and

problems in commun, wich is an excellent for

participating in a European partnership.

In the implementation of this project, "Learn & Do",

step one is improved and reinforced through step

two "Learn &Teach". We aim to train

trainees/workers for reaching good quality with an

international knowledge, vocational and individual

skills , relevant to working life. That will increase their

employability not only on their national market but

also in the EU labor market. In addition, this will

increase the frame for their lifelong learning.

How to connect ac motor in delta-star configuration

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Contents:

THE PROJECT SUMMARY ................................................ 1

Electric Induction Motor ................................................ 3

Star-delta starter ............................................................ 4

Wiring Materials ............................................................. 7

Step 1- Draw the Electric Scheme .................................. 9

Step 2 – Connect the motor ......................................... 10

Step 3 – Testing the motor ........................................... 10

Things to Be Aware Of .................................................. 11

Questions: .................................................................... 12

Andraž ŠPAN ................................................................. 14

Luka FARKAŠ ................................................................. 15

Urban MIKIC ................................................................. 16

Žan DOLAR .................................................................... 17

Domen ROMIH ............................................................. 18

Sven SENICA ................................................................. 19


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Electric Induction Motor

An induction motor is a type of electric motor that

converts electric power into rotary motion. An

induction motor uses the principle of electromagnetic

induction to cause the rotor to turn. The induction

motor was created and patented by Nikola Tesla in

1888. Electric current is supplied to the stator, which

induces a magnetic field that rotates. The rotating

magnetic field interacts with the rotor, inducing

current in the rotor. The interaction of the two

magnetic fields results in a torque, turning the rotor

within the motor casing. Because the induction motor

does not use brushes like DC motors, there is less

wear of the internal parts.


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Star-delta starter

The Star Delta Starter is a very common type of

starter and is used extensively as compared to the

other type of starting methods of the induction

motor. A star delta is used for a cage motor designed

to run normally on the delta connected stator

winding. The connection of a three-phase induction

motor with a star delta starter is shown in the figure

below.


March 2018


When the switch S is in the START position, the stator

windings are connected in the star as shown below.

When the motor picks up the speed, about 80 percent

of is rated speed, the switch S is immediately put into

the RUN position. As a result, a stator winding which

was in star connection is changed into DELTA

connection now. The delta connection of the stator

winding in shown in the figure below.


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Firstly, the stator winding is connected in star and

then in Delta so that the starting line current of the

motor is reduced to one-third as compared to the

starting current with the windings connected in delta.

When the induction motor starts the windings of the

stator are star connected, each stator phase gets a

voltage VL/√3. Here VL is the line voltage.

Since the developed torque is proportional to the

square of the voltage applied to an induction motor.

Star delta starter reduces the starting torque to one-

third that is obtained by direct delta starting.


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Wiring Materials

Asynchronous motor:

Asynchronous motor 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 can therefore be made without electrical

connections to the rotor. An induction motor's rotor

can be either wound type or squirrel-cage type.


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Star-delta switch:

Switch that switches from a star connection to a delta

connection.


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Step 1- Draw the Electric diagram

We should draw the electric diagram for delta star

motor configuration.


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Step 2 – Connect the motor

We connect motor using “banana” plugs according to

wiring diagram.

Step 3 – Testing the motor

After the connections are done we can test the

motor.


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Things to Be Aware Of

I. Be careful not to leave any open space when insulating the cables with tape after connecting the cables.

II. Be careful not to tighten the screws too much when installing the bell because the bell may break.

III. Be careful not to damage the conductors when opening the terminals

IV. The screw terminals of the transformer's terminals must be properly tightened. If it is tightened too much, the cables may be torn off. If tightened, the cables may become clamped, and the cables may become arcing due to their loosening.

V. When connecting the cables to the materials, connect them in the screw tightening direction.


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Questions:

1. What is the frequency of mains power in

Slovenia?

a. 16.7 Hz

b. 50 Hz

c. 60 Hz

2. What is the benefit of delta-star starter?

a. lower inrush current

b. no inrush current

c. higher inrush current

d. higher speed of motor on startup

3. Can we connect any motor in delta star

configuration?

a. yes

b. no

4. What mains power do we need to power

electric induction motor (possible multiple

answers)?

a. single phase

b. three phase

c. single phase with added capacitor

d. three phase with added capacitor


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5. What device do we use to protect electric

induction motor from overload?

a. fuse

b. bimetal safety switch

c. current limiter


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Andraž ŠPAN

Mobile: +38651241731

Email: [email protected];

[email protected]

Hi, I am Andraz. I

attend the vocational

school for chemistry,

electrical engineering

and computer

engineering in Celje,

Slovenia. I live in

Jurklošter. My

interest are model

trains, photographing, photo editing, filmmaking,

video editing, custom PC building, computer video

gaming. DIY electronic projects with arduino and all

other electric DIY projects. I have my own website:

www.andrazspan.com and my own YouTube channel:

www.youtube.com/user/andrazspan1

I am very excited about first Erasmus project.

mailto:[email protected]


http://www.andrazspan.com/

http://www.youtube.com/user/andrazspan1


March 2018


Luka FARKAŠ

Mobile: +38631837370

Email: [email protected]

Hi!

I am Luka. I attend

vocational school for

chemistry, electrical

engineering and

computer

engineering. I live in

Vitanje where we

have the center of European space technologies,

which I am interested in. Besides that, I really like

sports, reading and doing something new. Projects

like this really excites me. I get to know different

people, different cultures and probably different

mentality. I hope I will learn a lot new and that this

project will open my eyes and motivate me even

more.



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March 2018

Urban MIKIC

Mobile: +38670728913


Hi, I am Urban. I am an

electrical student from

Celje, Slovenia. I'm very

interested in robots,

programming and

automating different

systems. My hobbies are

sports, music, reading

books and learning

different things, especially things connected to

electricity. This is my first Erasmus project and I am

really excited about it. I joined it because I want to

meet new people and see how our profession is

taught in other countries.



March 2018


Žan DOLAR

Mobile: +38631773112


Hi, I am Žan and I am

electric and energetic

student in Celje,

Slovenia. I am very

interested in electric

motor and electric grid

engineering. My

interests are sport,

music, travelling and all

the things connected to electric. This is my first

Erasmus project and I am very excited about it,

especially because it is about electric. I am looking

forward to learning something new, to get to know

about new cultures and how things work in different

countries.



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March 2018

Domen ROMIH

Mobile: +38641265341


Hi, I am Domen, I live

in Žalec and studying

at vocational school

for electricity,

chemistry and

computer science in

Celje. My hobbies are

music, sports, science

and repairing and

creating new electrical circuits. I am very excited to

join this project, because I would like to extend my

knowledge, meet new people and create some

interesting projects. I think that is very important to

cooperate with people from other countries, so you

can see how other are facing different electrical

problems.



March 2018


Sven SENICA

Mobile: +38631280807


Hi, I am Sven. I attend

the vocational school

for chemistry, electrical

engineering and

computer engineering. I

live in Vrbno. My

interests are sports,

books, electricity and

music. I play the piano,

the accordion and the trumpet. I am very excited and

happy because this is my first Erasmus+ experience.

The reason for joining this project is to learn about

the different cultures, become more fluent in English,

meet new people, travel.



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HOW TO CONNECT AC MOTOR IN DELTA-STAR …web.sc-celje.si/etie/wp-content/uploads/2018/05/2.pdf ·...

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