How Rotating Magnetic Field Produced In 3 Phase Induction Motor

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How is the rotating magnetic field produced in 3-phase induction motor explain it with proper illustration?

When a 3-phase winding is energized from a 3-phase supply, a rotating magnetic field is produced. This field is such that its poles do no remain in a fixed position on the stator but go on shifting their positions around the stator. For this reason, it is called a rotating field.

How rotating magnetic field is produced in a three phase induction motor What is the speed of this field?

The 3-phase currents of a balanced 3-phase supply system produce a resultant flux of constant magnitude in the motor. The magnitude of the flux at every instant is 1.5 ϕm. The resultant flux is rotating in nature and it rotates at an angular velocity same as that of the supply currents.

How is the rotating magnetic field established in a three phase induction motor Why is this called the induction motor What is the other name used for it?

The three-phase balanced current flowing in the three windings on the stator produce a rotating magnetic field. It is called “induction” motor because this rotating magnetic field “induces” a voltage and a current in the rotor windings/conductors.

Does an induction motor have a rotating magnetic field?

The induction motor rotates due to the rotating magnetic field in induction motor, which is produced by the stator winding in the air gap between the stator and the rotor. The stator has a three phase stationary winding which can be either star connected or delta connected.

How a rotating magnetic field can be created?

A rotating magnetic field can be produced by a poly-phase (two or more phases) current or by a single phase current provided that, in the latter case, two field windings are supplied and are so designed that the two resulting magnetic fields generated thereby are out of phase.

How does the rotor rotates in a three-phase induction motor?

The induction motor always runs at speed less than its synchronous speed. The rotating magnetic field produced in the stator will create flux in the rotor, hence causing the rotor to rotate.

How is rotating magnetic field produced in alternator?

In alternators, a rotating magnet, called the rotor turns within a stationary set of conductors wound in coils on an iron core, called the stator. The field cuts across the conductors, generating an induced EMF (electromotive force), as the mechanical input causes the rotor to turn.

How is the rotating magnetic field obtained in a single phase induction motor?

The magnetic field rotates due to the 120° phase offset in each phase of the power supply. This rotating magnetic field induces a current in the bars of the rotor. The current in the rotor sets up its own magnetic field. The interaction between the stator and rotor magnetic fields causes the rotor to rotate.

How does an induction motor generate rotating motion?

As the coils are energized, the magnetic field they produce between them induces an electric current in the rotor. This current produces its own magnetic field that tries to oppose the thing that caused it (the magnetic field from the outer coils). The interaction between the two fields causes the rotor to turn.

Why does the rotor of a 3-phase induction motor rotate in the same direction as the rotating field?

Since the rotor circuit is closed, currents start flowing in the rotor conductors. Now, rotor conductors are carrying currents and are in the magnetic field. Therefore, mechanical force acts on the rotor, tending to move it in the same direction as the stator field.

What is the principle of operation of a 3-phase motor?

The working of the three-phase induction motor is based on the principle of electromagnetic induction. When three-phase stator winding of an induction motor is energized from a 3 phase supply, a rotating magnetic field is set up which rotates around the stator at synchronous speed (Ns).

What causes the magnetic field in a motor?

An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor.

What is the concept of a rotating magnetic field?

Rotating magnetic field is magnetic field which rotates in space about some point or axis. The North and South poles continuously rotates with a specific speed, called synchronous speed. All poly phase electrical machines are associated with rotating magnetic field in the air gap.

On what factor does the direction of rotation of a three phase induction motor depends?

The direction of rotation of the motor depends on the phase sequence of supply lines and the order in which these lines are connected to the stator. Thus, interchanging the connection of any two primary terminals to the supply will reverse the direction of rotation.

What causes the rotor to rotate?

Magnetic flux induced to the rotor bar by the electromagnetic induction law. For this flux rotor received magnetomotive forces and the rotor build up rotating torque. Finally, the rotor rotates a similar direction to magnetic flux.

What is a rotating magnetic field in a synchronous motor?

The rotating magnetic field can be defined as the field or flux having constant amplitude but whose axis rotates in a plane at a certain speed e.g. permanent magnet rotating in a space produces a rotating magnetic field.

How can you make a rotating magnetic field from two phase supply?

Although, like a 3-phase supply, the 2-phase supply can also produce a rotating magnetic field of constant magnitude. Therefore, all the single-phase induction motors, except shaded pole induction motor, are started as 2-phase motor. Once so started, the motor will continue to run on the 1-phase supply.

How is magnetic field revolving in a single-phase motor of a shade pole type established?

A shaded-pole motor is a small squirrel-cage motor in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole. When single phase AC supply is applied to the stator winding, due to shading provided to the poles, a rotating magnetic field is generated.

When an induction motor starts the rotor follows the direction of the rotating magnetic field and starts running in the same direction?

The direction of electromagnetic torque and the rotating magnetic field is the same. Thus, the rotor starts rotating in the same direction as that of the rotating magnetic field. The speed of the rotor is always less than the rotating magnetic field or synchronous speed.

What is working principle of induction motor?

Working Principle of Induction Motor The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.

What is the speed of rotating magnetic field?

Speed is important to the rotating magnetic field of an AC motor. It is known as “synchronous speed.” This speed is calculated by dividing 120 times the frequency (F) by the number of poles (P). As an example, the synchronous speed for a 2-pole motor operated at 60 Hz is 3,600 RPM.

What causes magnetic field?

All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.

Why does a coil spin in a magnetic field?

The permanent magnet attracts its opposite pole on the coil and repels its like pole, causing the coil to spin.

What happen to the direction of rotor rotation if the phase sequence of the three-phase winding is changed?

By interchanging any two phases (lines) the sequence of pole formation is being changed ie, the direction of the rotating magnetic field is reversed. Hence the direction of rotation of the motor also changes accordingly.

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