Why does a motor in reverse direction when the current through the field or armature circuit is reversed?

As the armature rotates, the commutator reverses the current in each coil as it moves between the field poles. Figure 6.29 shows how, for a permanent magnet motor, the torque developed varies with the rotational speed for different applied voltages.

Why the direction of rotation is changed only by changing the armature current direction?

This is because the direction of the magnetic field in both the armature and field windings reverse, and so remain in the same direction relative to each other. Just reverse the polarity of either the field or armature voltage source to change the direction of rotation.

How do you reverse the direction of rotating field in the induction motor?

The direction of rotation of a single-phase capacitor run induction motor is reversed by changing the direction of the rotating magnetic field produced by the main and starter winding or auxiliary winding. This can be accomplished by reversing the polarity of the starter or auxiliary winding.

Which part of DC motor reverses the direction of current through the coil every half cycle?

Commutators
Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.

Why and how does the DC shunt motor reversed its direction?

The direction of rotation of DC shunt motor can be reversed by reversing either field terminals or armature terminals but not both. The torque can be changed by changing either field flux or armature current. Hence the motor will rotate in the same direction by changing the supply connections.

What is the reason we reverse the armature leads on a compound motor to reverse the motor?

Fixing rotation problems for DC motors Their direction can be easily controlled by inverting the polarity of the applied armature voltage by reversing the armature leads. This works with shunt, series, and compound wound DC motors.

Why and how does the DC shunt motor reverse its direction?

What is reversible motor?

[ri′vər·sə·bəl ′mōd·ər] (electricity) A motor in which the direction of rotation can be reversed by means of a switch that changes motor connections when the motor is stopped.