When the rotor rotates at the same speed and in the same direction as the rotating stator field?

A synchronous motor is one in which the rotor normally rotates at the same speed as the revolving field in the machine. The stator is similar to that of an induction machine consisting of a cylindrical iron frame with windings, usually three-phase, located in slots around the inner periphery.

What is the direction of rotation of rotor in induction motor?

When the current flows into the three-phase winding, expressed as Eq. (11.1), the rotating MMF rotates clockwise and it has the same rotor direction. If the three-phase winding is changed to two phase, the rotor of the motor rotates in the opposite direction.

How does rotor in synchronous motor be able to rotate at the same speed as the rotating magnetic field in stator?

After the motor attains maximum speed, DC is applied to the rotor coils. This creates a strong and ongoing magnetic field in the rotor that matches the rotating magnetic field. As a result, the rotor rotates at the same speed as the rotating magnetic field (or synchronous speed). Therefore, there is no slip.

Why is it impossible for the rotor of an induction motor to rotate at the same speed as that of the magnetic field?

3 Answers. In an induction motor, the speed of the rotor structure is always less than the speed of the stator field. However the rotor field rotates faster than the rotor structure so that the rotor and stator fields are synchronized with each other.

Why do induction motors rotate?

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.

Why does a motor 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.

Why does the rotor spin in an induction motor?

The interaction between the two fields causes the rotor to turn. As the magnetic field alternates between the red and blue coils, it effectively rotates around the motor. The rotating magnetic field makes the rotor spin in the same direction and (in theory) at almost the same speed.

Why the rotor of synchronous machines are bound to run on synchronous speed only?

This property is due to the inertia of the rotor; it cannot instantly follow the rotation of the magnetic field of the stator. Since a synchronous motor produces no inherent average torque at standstill, it cannot accelerate to synchronous speed without some supplemental mechanism.

Why does the 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.

Why are rotor bars needed?

In generator operation, the nominal stator current must not exceed the rated current of the motor in order to avoid overheating. Rotor bar construction is probably the main parameter for an accurate selection of induction machine to operate as generator.