Why rotor rotates in induction motor?

Last Update: May 30, 2022

This is a question our experts keep getting from time to time. Now, we have got the complete detailed explanation and answer for everyone, who is interested!

Asked by: Mr. Julian Conn MD
Score: 4.6/5 (51 votes)

The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.

Why the rotor of an induction motor rotates in the same direction as the stator magnetic 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 causes motor to rotate?

A coil of wire carrying a current in a magnetic field experiences a force that tends to make it rotate. This effect can be used to make an electric motor.

How do you rotate a motor?

The current-carrying wire in a magnetic field results in a force which will rotate the rotor. top conductor (“a”) of the armature loop towards the left, and acts to pull the lower conductor (“b”) towards the right. These two forces rotate the armature that is attached to the rotor.

How does a motor coil rotate?

When a current passes through the armature coil, forces act on the coil and result in rotation. Brushes and a commutator are used to reverse the current through the coil every half rotation and so keep the coil rotating. The speed of rotation can be changed by changing the size of the current to the armature coil.

How does rotor rotate ?

29 related questions found

Why does the rotor rotates in 3 phase induction motor?

When the three-phase power supply to the stator. This current flows to the stator winding(conductor). Then it produces magnetic flux and it's rotated to the clockwise direction around the conductor. ... For this flux rotor received magnetomotive forces and the rotor build up rotating torque.

What is the difference between rotor and armature?

A rotor is basically – as the word suggests – a rotating electrical component in the mechanism. ... So basically, the rotor consists of a field magnet which rotates while the rotor remains stationary and on the other hand the armature carries current and is stationary and part of the stator.

How does a rotor rotate?

The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.

Is AC motor and induction motor same?

The two main types of AC motors are induction motors and synchronous motors. The induction motor (or asynchronous motor) always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding.

What is the function of induction motor?

An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor.

What are the types of induction motor?

Induction motors are classified into two types namely single phase induction motor and three-phase induction motor. As their name suggests, a 1-phase induction motor is connected to a single-phase AC power supply whereas the 3-phase induction motor can be connected to a three-phase AC power supply.

What is the function of rotor?

Rotors are the moving part in an Alternator that have permanent magnets that move around the Stator's iron plates to generate an Alternating Current (AC). Rotors require existing motion to function, so only once the engine or turbine is already running will a Rotor work with a Stator to provide a charge.

What is rotor speed?

Rotor spinning

Rotor speed depends, in part, on rotor diameter. Rotor speeds typically lie in the 120–210 m/s range, but mostly between 150 and 190 m/s, with a tendency to be higher with a smaller rotor diameter [6].

How is rotor current calculated?

The frequency of the rotor current fr = Ns x P/120, so fr = 0 if the slip is zero. If the operating speed is zero, Ns = N and the frequency of the rotor current is the same as the frequency of the stator current . f = source frequency in Hz.

What is called armature?

In electrical engineering, an armature is the component of an electric machine that carries windings which, when an electric current passes, produces an electromotive force. ... The armature can be on either the rotor (rotating part) or the stator (stationary part), depending on the type of electric machine.

What's the use of armature?

An armature is used as an electric motor or generator. The armature is used to communicate between two magnetic fluxes. When the armature is used as an electric motor, due to relative motion between flux produced by the field winding and the flux produced by the armature winding the EMF is induced.

What are the different types of rotors?

The four different rotor types are:
  • Blank & Smooth - Blank and smooth rotors are what you'll find on most passenger vehicles and feature a smooth, blank metal surface all the way around the rotor.
  • Drilled - Drilled rotors feature drilled holes around the metal surface.

What are the different types of rotor used in induction motor?

There are two types of induction motor rotors: Squirrel-cage rotor or simply cage rotor. Phase wound or wound rotors. The motors that use this type of rotor are known as Slip-ring rotors.

Why does the coil turn in an electric motor?

The coil is made of copper wire - because it is such an excellent conductor (see conducting properties). It is wound onto an armature. The coil becomes an electromagnet when a current flows through it. ... They produce a steady magentic field so that the coil will turn when a current flows in it.

What makes a motor spin faster?

ANSWER: In order to make the motor spin faster or slower you must increase or decrease the strength of the magnetic field. This is done by either changing the amount of current running through the motor or varying the distance of the permanent magnets from the motor.

Why do motors rotate anticlockwise?

It is due to the counter clockwise motion of the motor. The motor rotates in the counter clockwise direction the blades of the fan are attached to the motor hence the blades rotates in the anti clockwise direction. So it is due to the motor rotation the fan rotates in counter clockwise direction.

What is the function of rotor side converter?

Explanation: The function of rotor side converter is to control the generator. It controls the generator in terms of active and reactive power by ensuring minimum power loss during power conversion. The rotor side converter is made up of IGBT.