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The crawling in the induction motor is caused by?
By BYJU'S Exam Prep
Updated on: September 25th, 2023
(A) Improper design of stator laminations
(B) Low voltage supply
(C) High loads
(D) Harmonics developed in Motor
The crawling in the induction motor is caused by harmonics developed in motor. The propensity of squirrel cage rotors to run at speeds as low as one-seventh of their synchronous speed is known as crawling. The crawling of an induction motor is the technical term for this occurrence.
Crawling in Induction Motor
The speed of all the harmonics produced by stator slotting coincides with the speed of the corresponding rotor harmonics when the number of rotor slots is equal to the number of stator slots.
As a result, harmonics of all orders would attempt to produce synchronous torques at their synchronous rates, and the machine would not turn on. Cogging or magnetic locking is the term for this. Thus, the number of stator slots should never be the same as the number of rotor slots. Making the ratio of rotor slots to stator slots prime is an easy way to avoid cogging.
An induction motor, also known as an asynchronous motor, is an AC electric motor in which the magnetic field of the stator winding is used to electromagnetically induct the electric current into the rotor necessary to produce torque. Therefore, it is possible to construct an induction motor without electrical connections to the rotor. Either a wound type rotor or a squirrel-cage type rotor can be used in an induction motor.
Summary:
The crawling in the induction motor is caused by? (A) Improper design of stator laminations (B) Low voltage supply (C) High loads (D) Harmonics developed in motor
The harmonics produced by the induction motor are what cause it to crawl. Crawling is the tendency of squirrel cage rotors to operate at speeds as low as one-seventh of their synchronous speed.
