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

what is cogging and crawling

Answer Posted / sukhjeet saini

When rotor bars are made to run parallel with stator , the
torque rises & falls correspondingly causing more
pulsations. This is termed as cogging in other qords
magnatic locking. This is reduced by making the rotor bars
run at an angle to the stator ie crawling in order to make
the torque uniform.

Crawling on the other hand signifies running of motor at
almost one seventh of the rated spped due to interference
of seventh harmonics.

Is This Answer Correct ?    144 Yes 43 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How many double suspension hardware fittings are required on a double circuit transmission tower?

1148


Why reactive power is needed in a power system? How is it being absorbed or delivered by alternators? For reactive power control we are changing excitation but reactive power absorbing or delivering related to stator. How these two are interlinked? i want a detailed explanation with necessary expressions and figures?

1116


What types of CMOS memories have you designed? What were their size? Speed? Configuration Process technology?

2695


IN electrical field, WHAT ALL THINGS THE CUSTOMER WILL ASK WHILE ORDERING FOR LT PANEL (ALL TYPES OF LOW TENSION PANEL)

1387


In synchronous motor, how the field current is related to armature current..i know its inversely proportional..but concept wise...i was nt clear....pls help me...

1336






in dc shunt motor if field winding is shorted then

1181


What is the function of Governor in Hydro Power Station? What is the Function of Lightning Arrestor Voltage Transformer (LAVT)?

2035


what is the defination of Cable database? What are the points are considered while preparing cable database? Is there any sample available for cable database?

1205


What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

728


what is the safty of poly phase tranformer?

1387


what is frequency response?

396


what is meant by CT`s saturation ? Can we use Metering CT`s with Protetection CT`s ?

1413


What the main causes of transient interruptions on Over-Head Distribution Lines?

1350


EXPLAIN THE ESSENTIAL FACTORS WHICH INFLUENCES THE CHOICE OF SITE FOR A HYDRO ELECTRIC POWER PLANT

1232


WHAT IS MEANT BY TV TERMINAL IN 500MVA TRANSFORMER?

1429