Crawling refers to a condition wherein there is a slow rotation of the rotor caused due to the presence of harmonic content in the supply.
sometimes particularly the squirel cage type rotor run stably & speeds as low as 1/7 of their synchronous speed.This phenomenon is known as crawling of an induction motor.
Yes the Induction motor works on Electromagnetic induction principle.
Induction motor is an AC electric motor which uses electromagnetic induction to induce the electric current in the rotor to produce torque.
A single phase induction motor is mainly used in fans.It is capacitor start capacitor run induction motor.In three phase induction motor squirrel cage induction motor is mainly used in elevators,lifts,cranes.slip ring induction motor is mainly used in electrically driven ships.
AC Induction Motor
1. Induction Motor has an air-gap but transformer has no air gap rather it is mutually link. 2. Induction Motor has high no-load current than transformer. 3. Induction Motor is a dynamic device. 4. Induction Motor has high power factor.
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Induction motor used in industries for variable speed machines . Induction motor has always lagging power factor. Less cost compared to syn. Motor.
single-phase induction motor is used in ceiling fan.
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.
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