Follow Our FB Page << CircleMedia.in >> for Daily Laughter. We Post Funny, Viral, Comedy Videos, Memes, Vines...


whose motors self starting synchronous or Induction motor?give
fact reason why not self starting another mother

Answers were Sorted based on User's Feedback



whose motors self starting synchronous or Induction motor?give fact reason why not self starting a..

Answer / sanjeet singh

if we talk about the single phase induction motor.they are not self start because no motor can run on single phase.so to start such motors we required an auxiliary winding ,which providing the another phase to starting a single phase motor.such as,in a ceiling fan a capacitor providing the starting phase. so single induction motor is not self start.

Is This Answer Correct ?    3 Yes 2 No

whose motors self starting synchronous or Induction motor?give fact reason why not self starting a..

Answer / yogesh

Single phase induction motor or synchronous are motor not self starting motors. In case of 3 phase, induction motor is self starting one. Synchronous motor is not a self starting one. Reason: if 3 phase supply is applied to stator, the rotating magnetic field(RMF) is produced with sync speed which will induce the emf on the rotor and produce flux. The rotor flux interacts with stator flux and rotor will rotate to catch the speed of stator(rotating magnetic field speed i.e. Sync speed). In sync motor the rotor is either in salient or non salient pole. If 3 phase supply is given to stator, RMF is prodused. Apply DC supply to the rotor(LET Salient pole rotor with 2 poles). Now N , S poles are induced in rotor. If at one instance stator N pole is nearer to rotor S pole, at that time the rotor tries to move in clock wise direction (for eg.). Suddenly the stator poles(rmf) will move to the another portion of the stator. Let stator S Pole is nearer to rotor S pole, at that time rotor will try to move in anti clk wise direction because stator N pole is at exactly in opposite direction to that of rotor axis. Since RMF is rotating in sync speed the rotor can not move in both clk wise and anti clk wise direction. The result is both clk and anti clk torques get cancelled each other. The rotor does not rotate. To make the sync motor self starting we can provide damper windings on the pole faces of rotor that could act as induction motor at starting then after running of the rotor switch on the DC supply to rotor. Now magnetic locking takes place between stator poles and rotor poles. Now the motor runs in sync speed.

Is This Answer Correct ?    0 Yes 0 No

Post New Answer

More Electrical Engineering Interview Questions

I need the list of Universities who have summer intake for BS degree in Electrical Engineering.?

0 Answers  


Which protection detects both AC and DC?

3 Answers   Megatron Solutions,


What is turn ratio of a transformer?

0 Answers  


what are the functions & ratings of panels mentioned below: 1. Main LT Panel(MLTP) 2. Motor Control Centre(MCC) 3.Feeder pillars 4.Busducts

1 Answers   Aurobindo,


what is the difference b/w absolute encoder and incremental encoder?

0 Answers  






What is VCB? Where it is installed?

11 Answers   Hyundai,


Which are Electrical componet and Electronics componet??

2 Answers   KarMic,


What is difference between mcb and mccb.

0 Answers  


CONSIDER A 415V/200V STEP DOWN TRANSFORMER.CAN WE USE USE IT AS STEP UP TRANSFORMER BY GIVING 200V IN SECONDARY AND TAKING OUTPUT FROM PRIMARY?

22 Answers   L&T,


What do we use in Motor core laminations..???CRGO or CRNGO..and why..????

1 Answers  


what is the formula for efficiency of francis turbine and generator for hydropower? what is best way to select francis turbine and generator?

0 Answers   HAL,


Shall we use Dyn1 transformer in place of Dyn11 for motor application as a distribution transformer

1 Answers   NSL Sugars,






Categories
  • Civil Engineering Interview Questions Civil Engineering (5074)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4444)
  • Electrical Engineering Interview Questions Electrical Engineering (16594)
  • Electronics Communications Interview Questions Electronics Communications (3915)
  • Chemical Engineering Interview Questions Chemical Engineering (1092)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (214)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (258)
  • Instrumentation Interview Questions Instrumentation (2986)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (123)
  • Power Plant Engineering Interview Questions Power Plant Engineering (170)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (0)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1377)