Dc and ac motor starter
-
Upload
vishalgohel12195 -
Category
Engineering
-
view
291 -
download
3
Transcript of Dc and ac motor starter
PRESENTATION ONDC and AC motor starter
Content
• Necessity of starter• Function of starter• Dc motor starter• Ac motor starter
Necessity of starter
• At starting ,the speed of motor is zero so that the back e.m.f. In the armature is zero.
• Armature resistance is so low, if it is connected to power supply directly ; huge current will pass thru armature.
• The huge current may damage the machine, major heat, very high speed in case of DC series motor.
• Ia = V/Ra
Function of starter
• Start and stop the motor. • Limit inrush current where necessary.• Permit automatic control when required• Protect motor and other connected
equipments from over voltage, no voltage, under voltage, single phasing etc.
Type of starter
for DC Motor• Three point starter for shunt motor • Four point starter for compound motor
For AC Motor • DOL Starter • Star-Delta• Auto-transformer
Dc motor starter
• Three point starter• Four point starter
Three point starter
Four point starter
Ac motor starter
• Dol starter• Star-delta starter• Automatic rotor resistance starter• Auto transformer starter
Wiring Diagram of DOL Starter:
Star delta starter
• Two types 1. Manual star delta starter2. Automatic star delta starter
Manual star delta starter
Manual star-delta starter
• Commonly used
Automatic star delta starter
Automatic rotor resistance starter
Auto transformer starter
There are two types 1. Automatic auto transformer starter2. Manual auto transformer starter
Automatic auto transformer starter
Manual auto transformer starter
•Thank you