what is cogging and crawling
Answer Posted / dharm veer verma
Induction motors have a series of slots in the stator and in the rotor. These slots should not be equal in number because if they are, there is a good chance that the motor will not start at all due to a characteristic known as cogging. The slots will align like a stepper motor.
For this reason, there are an unequal number of slots in the rotor and in the stator, but there can still be situations where the slot frequencies coincide with harmonic frequencies and this can cause torque modulations. The slots are skewed to keep an overlap on all slots to reduce this problem.
Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
hai friends i have BSNL JTO exam on next month so if any body have model question paper or give preparation tips to my mail id kumar4486@yahoo.co.in this will helpfull for my future .plz & thank u by kumar
Type of motor stater detail and working detail
Can anyone tell the proper diagram of star delta starter????
In what cases (circumstances)we should apply P controller, PD controller, PI controller & PID controller ?
how to carry out Magnetizing Current Test on Distribution transformer and what purpose we are doing this test. why transformer rating in always in KVA ? what ispositive, negative, zero sequence impedence? How ElCB tripping if Neutral touch with ground Why AC & DC capacitor are use in UPS ? why motor rating in KW? how to syncronize two dg sets
What is earth?
clarify types of motor operated valves and advantages
if i am in front of transmission line how to know that current direction without any equipment
IF % IMPEDANCE OF A TRANSFORMER IS INCREASED FROM 5.8% TO 8% HOW MUCH THE EFFICIENCY OF THE TRANSFORMER WILL COME DOWN?
Why IR value of the (HT cable Plus synchronous motor) is less while individually having IR values in GΩ?
why we not used 11kva as a direct our electrnics component.
Mention the methods for starting an induction motor?
wht is embedded systems? what is new inthis field?
two way ckt diagram can be drawn by how many ways? give diagram
what is meant by rotating magnetic filed