starting torque is increased and current is decreased by
using external resistance in a slip ring induction motor.
How??
Answers were Sorted based on User's Feedback
Answer / srb
It is because as the resistance is added in rotor ckt,no doubt impedance increases due to which current decreases but the effect of improved pf predominanats the inc. impedance & hence torque inc. After some tym when motor has achieved considerable speed effect of inc impedance predominanats over improved pf & hence torque decreases.
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / nilkanth tailor
THEIR R BASICALLY TWO TYPES OF INDUCTION MOTOR
1) SLIP RING I.M.
2) SQUIRREL CAGE I.M.
GENERALLY, IN HIGH STRATING TORQUES MOTOR(DC SERIES
MOTOR) HAS HIGH STARTING CURRENT, AND ITS VERY DIFFICULT TO
CONTROL THAT CURRENT...BUT IN SLIP RING I.M THIER IS HIGH
TORQUES PRODUCE WITH LOWER STARTING CURRENT THAT IS MAIN
ADVATAGE...
THE MAIN DIFF BET. SLIP AND SQUIRREL CAGE I.M. IS THAT
1)The rotor of the slip ring motor has more windings than a
squirrel-cage rotor so that induction voltage is higher and
the current for the same field strength lower.
2)During start-up the a typical rotor has 3 poles connected
to the slip ring. Each pole is wired in series with a
variable power resistor.
3)During start-up the resistors reduce the field strength
in the stator. As a result the inrush current is reduced.
| Is This Answer Correct ? | 1 Yes | 0 No |
Is current shock due to voltage or current? pls answer
why earth hole size is biggest in plug point?
IS RTCC AND OLTC REQUIRED FOR 500 KVA 11KV/433V TRANSFORMER FOR AN INDUSTRY?
7 Answers IGCAR, TNEB Tamil Nadu Electricity Board,
what can be the causes of capacitor start motor having a higher current that its actual
what is vector diagram in three phase transformer
How to select Main CB Rating for 220 KW Load?
what is the function of AVR in generator? how the generator maintain the frequency while varies the load?
What is slip in an induction motor?
Is it necessary to seperate the DG earth grid with Electricity Board earth grid for protecting the DG set. if yes why?
how snubber circuit works to protect switching devices?
Can we use 3 phase energy meter for measureing power in 2 phase 440 V phase circuit?
Explain Active power,reactive power,how its related to each other , & inductive ,capacitive.
Civil Engineering (5086)
Mechanical Engineering (4453)
Electrical Engineering (16638)
Electronics Communications (3918)
Chemical Engineering (1095)
Aeronautical Engineering (239)
Bio Engineering (96)
Metallurgy (361)
Industrial Engineering (259)
Instrumentation (3014)
Automobile Engineering (332)
Mechatronics Engineering (97)
Marine Engineering (124)
Power Plant Engineering (172)
Textile Engineering (575)
Production Engineering (25)
Satellite Systems Engineering (106)
Engineering AllOther (1379)