Why does a motor reverse rotation when 2 leads are swapped?

In a 3-ph IM the rotating magnetic field direction is the direction of rotation of the rotor. If you interchange any two supply terminals the phase sequence is reversed and hence the rotating magnetic field too reverses. This will make the rotor torque reverse and so it will slow down and then reverse its direction.

Why there is reversal of direction of motor shaft with change in phase sequence?

Once two of the lines have been switched, the direction of the magnetic fields created in the motor will now cause the shaft to spin in the opposite direction. This is known as reversing the phase rotation .

Why does the direction of rotation of a three phase induction motor reverse on changing the phase sequence?

Detailed Solution. The direction of rotation of a 3 phase induction motor can be reversed by interchanging any two of the three motor supply lines. Such that the field rotates counterclockwise rather than clockwise. However, the number of poles and the speed at which the magnetic field rotates remain unchanged.

Why does the direction of rotation reverse when any two stator terminals are interchanged?

When the external supply terminals are interchanged, the relative phase sequence between the two phase winding currents remains the same. Thus there is no reverse rotation. Hence interchange of any two phase supplies changes the relative phase sequence between the phase currents, causing reversal of rotation.

Why do we reverse a motor?

This is primarily because they are highly efficient and, relative to single-phase, they cost loss. Three-phase AC motors have a rotating magnetic field that causes the rotor to spin in a specific direction. If the motor is running the wrong direction, that means it is not in the correct phase sequence.

How is the direction of rotation of an induction motor reversed?

The direction of rotation of a 3 phase induction motor can be reversed by interchanging any two of the three motor supply lines. Such that the field rotates counterclockwise rather than clockwise. However, the number of poles and the speed at which the magnetic field rotates remain unchanged.

How a rotating motor can be made to rotate in the reverse direction?

In order to reverse the direction of an AC motor, the magnetic fields must be altered to provoke movement in the opposite direction. Since each wire consists of a positive and negative current within the magnetic fields, the flip-flopping of main and starter wires causes the motor to run in reverse rotation.