1. 3 PHASE AUTOMATIC STAR- DELTA
STARTER USING RELAYS AND
ADJUSTABLE ELECTRONIC TIMERS
FOR INDUCTION MOTOR
SUBMITTED BY
EDGEFX TEAM
2. ABSTRACT
• Star/Delta starters are probably the most common reduced
voltage starters in the 50Hz industrial motor world
(Known as Wye / Delta starters in the 60Hz USA world)
• They are used in an attempt to reduce the start current
applied to the motor during start as a means of reducing
the disturbances and interference on the electrical supply.
4. HARD WARE EQUIPMENTS
• POWER SUPPLY BLOCK
• RELAY
• INDUCTION MOTOR
• 555 TIMER
• BC 547 TRNSISTOR
• BC 558
• IN4007 RECTIFIER DIODE
• LED
• RESISTORS & CAPACITORS
5.
6. 555 TIMER
• The 555 Timer IC is an integrated circuit (chip)
implementing a variety of timer and multivibrator
applications.
• The original name was the SE555 (metal can)/NE555
(plastic DIP) and the part was described as "The IC Time
Machine".
• Depending on the manufacturer, the standard 555 package
includes over 20 transistors, 2 diodes and 15 resistorson a
silicon chip installed in an 8-pin mini dual-in-line
package (DIP-8)
7. PIN DIAGRAM OF 555
The 555 timer IC is a simple 8 pin DIL package IC.
It can:
be used as a monostable
be used as an astable
source or sink 100mA
use supply voltages of 5v to 15v
disrupt the power supply - use a decoupling
capacitor!
8. THREE PHASE INDUCTION MOTOR
• It consists of the fixed stator or frame, a three-phase winding
supplied from the three-phase mains and a turning rotor
• There is no electrical connection between the stator and the
rotor
• Stator and rotor are made of highly magnetizable core sheet
providing low eddy current and hysteresis losses
9. Stator & Rotor
• The stator winding consists of three individual windings which
overlap one another and are offset by an electrical angle of 120°
• Synchronous Speed (Ns)= 60; f/p
• Ns= Synchronous Speed/ minute;
• F= frequency;
• P=Pole pair Number;
• Rotor in induction machines with squirrel-cage rotors consists of a
slotted cylindrical rotor core sheet package with aluminum
barswhich are joined at the front by rings to form a closed cage
11. BC547
The BC547 transistor is an NPN Epitaxial
Silicon Transistor.
The BC547 transistor is a general-purpose
transistor in small plastic packages.
It is used in general-purpose switching and
amplification BC847/BC547 series 45 V, 100 mA
NPN general-purpose transistors.
Whenever base is high, then current starts
flowing through base and emitter and after that
only current will pass from collector to emitter
12. BC558
The BC557 transistor is an PNP Epitaxial Silicon
Transistor
The BC557 transistor is a general-purpose transistor in
small plastic packages. It is used in general-purpose
switching and amplification BC847/BC547 series 45 V,
100 mA PNP general-purpose transistors.
13. The arrow in the PNP transistor symbol is on the emitter
leg and points in the direction of the conventional current
flow when the device is in forward active mode.
14. RELAY
IT IS A ELECTRO MAGNETIC SWITCH
USED TO CONTROL THE ELECTRICAL DEVICES
COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE
15. BIBILOGRAPHY
The 8051 Microcontroller and Embedded systems” by Muhammad Ali
Mazidi and Janice Gillispie Mazidi , Pearson Education.
ATMEL 89S52 Data Sheets.
www.atmel.com
www.beyondlogic.org
www.wikipedia.org
www.howstuffworks.com
www.alldatasheets.com
