Induction motor is nothing but rotating transformer it works on principle of mutual induction , mainly induction motor consists of rotor and stator,stator is excited by three phase supply and rotor is shorted through resistances and slip rings. When ever stator is excited by three phase supply a rotating magnetic field running at synchronous speed is produced which in turn cuts the rotor winding causes flowing of current results in production of magnetic fields in rotor which having less than synchronous speed (slip speed), then the interaction of these stator and rotor magnetic fields produces a twisting moment in the rotor called synchronous speed
Yes, that is one of the major advantages of a three-phase induction motor.
You never need a starter for a three-phase motor.
ya three phase squirrel cage induction motor used to hoist travel application in industrial cranes
The 3-phase currents in the 3 coils of an induction motor will produce a steady rotating magnetic field.
The primary disadvantage of the three phase induction motor is that speed control is a challenge. But new technology in the form of VFDs (variable speed drives) is now rectifying this situation very effectively. Another disadvantage is that single phase power is common while three phase power is less commonly available.
why three phase induction motor is delta connected
Yes, that is one of the major advantages of a three-phase induction motor.
You never need a starter for a three-phase motor.
Three Phase Induction Motor is self starting motor so you can start it by conneting to power lines directly if the power line capacity is sufficient.
A three-phase motor has a steady rotating magnetic field generated by the stator coil, and the rotor just follows the field.
ya three phase squirrel cage induction motor used to hoist travel application in industrial cranes
This question doesn't really make any sense - any of the two phase? A three phase induction motor requires 3 phases to start - if a single phase is lost while the motor is already running then yes the motor will continue to run. A three phase motor will not start if it is missing a phase.
Slip Ring Induction Motor and Squirrel Cage Indution Motor
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.
They are the same thing: (Nsync - N)/Nsync, or 1 - N/Nsync
I have never come across a three phase capacitor start motor. Any three phase motors I have worked on are induction start.
One of the disadvantages of the 3 phase induction motor is that it requires a three wire supply. The other disadvantage is that the 3 phase induction motors have poor starting torque and high have in the rush currents.