0
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
Wiki User
∙ 12y ago
Wiki User
∙ 10y agoA three phase induction motor is a device in which the rotor rotates at speed slightly less than the synchronous speed. the difference between the synchronous speed and the rotor speed is called slip which ranges from 2-5%.
Wiki User
∙ 14y agoWhat is the question? Three phase motors are usually the choice for large motor and commercial applications. They usually operate on higher voltages which reduces associated costs of wiring and switchgear. These voltages are not available to the average homeowner. They are also cheaper than single phase motors. They use fewer parts and simpler windings. Commercial demand also affects the cost. The most important consideration in motor selection is power consumption, measured in watts. Three phase motors still consume watts to generate horsepower, so the basic difference is economic in nature.
Wiki User
∙ 13y agoThree phase supply can be connected with the help of following to the induction motor:
1. Directly with M.C.B.
2. Directly with M.P.C.B.
3. Through Direct On-line Starter.
4. Through Star-Delta Stater.
5. Through Soft Stater.
6. Through A.C. Drive.
Wiki User
∙ 12y agoNormally you use a motor starter or contactor. There are manual and electric starters available. With a starter it closes all three legs of power at the same time to the individual phases. Other options are VFD's and Soft starts.
Add your answer:
Earn +20 pts
Is 3 phase induction motor is self starting?
Yes, that is one of the major advantages of a three-phase induction motor.
Do you need starter for 0.5HP three phase induction motor?
You never need a starter for a three-phase motor.
Is three phase induction motor used for hoisting device?
ya three phase squirrel cage induction motor used to hoist travel application in industrial cranes
Why three phase induction motor has uniform torque?
The 3-phase currents in the 3 coils of an induction motor will produce a steady rotating magnetic field.
What are the disadvantages of a three phase induction motor?
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.
Theory for brake test on three phase induction motor?
why three phase induction motor is delta connected
Is 3 phase induction motor is self starting?
Yes, that is one of the major advantages of a three-phase induction motor.
Do you need starter for 0.5HP three phase induction motor?
You never need a starter for a three-phase motor.
How do you start three phase induction 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.
Is a three phase induction motor self starting?
A three-phase motor has a steady rotating magnetic field generated by the stator coil, and the rotor just follows the field.
Is three phase induction motor used for hoisting device?
ya three phase squirrel cage induction motor used to hoist travel application in industrial cranes
Is three phase induction motor continue running when any of the two phase is disconnected?
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.
Applications of induction 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.
Full form of scim and srim in three phase induction motor?
Slip Ring Induction Motor and Squirrel Cage Indution Motor
How is slip in three phase induction motor different from slip in single phase induction motor?
They are the same thing: (Nsync - N)/Nsync, or 1 - N/Nsync
Disadvantages of 3 phase induction motor?
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.
How do you wire a three phase motor with capacitor start?
I have never come across a three phase capacitor start motor. Any three phase motors I have worked on are induction start.
