Question

What is an armature?

Answer 1

Hint: An armature can be defined as a rotating or static power generating component in an electric machine. The interaction of the armature with the magnetic flux can be done in the gap of air. The field element of an armature can include any stable magnets or electromagnets which are shaped in a way like a conducting coil, which is known as a doubly-fed electric machine. The armature always works like a conductor acting in the direction of the normal toward both the field as well as the motion direction, torque or force.

Complete answer:
Working of an armature: The armature rotation can be caused by the connection of two magnetic fields. One magnetic field can be generated by the field winding, whereas the second can be produced with the armature. When voltage is applied toward the brushes to get in touch with the commutator, the current supplies through the winding of an armature and creates a magnetic field. This is out of line by the field created with the field coil.

This will cause the power of attraction toward a single pole as well as repulsion from the other. When the commutator is connected to the shaft then it will also move in the same way as the commutator, and eventually activate the pole. The armature will continue to let the pole to spin. However, the commutator being associated with the shaft frequently activates the polarity because of its revolution, and the real output will be a D.C.

Role of an armature: The role of an armature is multi purposed. The primary role is to transmit current across the field, therefore generating torque within a machine or strength in a linear machine. The second role of an armature is to produce an EMF, electromotive force. An EMF can occur with the armature’s relative motion as well as the field. As the machine is working as a motor, then the EMF will oppose the current of the armature and convert the electric power into mechanical in the form of torque, and finally transmits through the shaft.

Note: It must be noted that if the voltage is not given to the brushes, then the field as well as the armature will get excited and hence will be driven mechanically. The voltage which is applied is A.C. because it approaches and flows away from the pole.