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what is the difference between inrush curent and jurk load.
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Answer Posted / s s nanal
In case of AC Motor Inrush current is current drawn by
motor while at start.This inrush current is very high (
almost 5 -6 times full load current.) The reason is,at
start the back emf offerred is zero.This back emf is
developed as the rotor gains speed.Hence at start Current
drawn by motor is equal to Voltage divided by impedance of
stator winding( winding impedance is very low,hence
starting current is high.) Once the rotor gains speed
current drawn by motor is equal to Voltage- Back emf/
impedance.As back emf is developed now the motor draws less
current.
Jurk Load is current drawn by motor already running.But due
to jurk load motor draws high current in order to maintain
speed ( near synchronous speed)
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