MOTOR ACTION
👉PRINCIPLE OF MOTOR ACTION :
"When a current carrying conductor is placed in magnetic field, the mechanical force is produced on it."
➣ In figure (a) magnetic field is shown. In figure (b) a conductor is shown which is perpendicular to the plane of the paper.
➣ Current flows through the conductor in the inward direction. Due to this current magnetic field is produced which is circular and its direction is clockwise.
➣ Now when this conductor is placed in the magnetic field as shown in figure (c), the main magnetic field lines get bent due to the interaction of the two fields.
➣ These lines of force experience tension and try to become straight.
➣ So, a force is produced on the conductor, due to which the conductor will move towards left.
The direction of the force can be found by applying the Fleming's left hand rule.
➣ Now this conductor when placed on the cylindrical rotor as shown in figure (d), the torque will be produced depending upon the direction of the field and the direction of current. In this case, it is in the anticlockwise direction.
➣ As shown in fig (e), If the density of the magnetic field is B Tesla, current flowing through the conductor is I ampere and if the length of the conductor is 1 meters, then
➣ Force acting on conductor F= BIL Newton
➣ If r is the radius of the cylinder, Torque T = F x r Nm.
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