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
How to calculate Voltage regulation of 22 KV Over head Line.
11kv/433v delta/star distribution transformer primary side full load Ht current is 83.33A in , but input side VCB rating 800A.why?
What is PQA???Applications........
IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?
Bimetal strip used in overload relay what is that,which types of material used for that & percentage.
What is the effect on 3phase induction motor if current setting knob of DOL kept at minimum current?
why 1.7Uo for HV cable Hi pot test?IE standard why?
Why do we apply both Differential and REF (HV and LV) protection schemes on YNyn configuration of a transformer?
How to test lightning Arrester?
what is the function of impulse relay
A low wet bulb temperature indicates
hi frnds what is meant by harmonics & what is meant by third hormonics,where its will occur ?thank u
working of diesel generator ?
how can i apilly for electrical c licencese.sir,i completed B.Tech in electrical & electronics engineering in 201onot working any company
What is the minimum IR value of HT/ LT cable? Pls post separetely!!!!!