Machine Parts

Let us investigate the voltage obtain from coil as it rotates in a magnetic field.              The voltage induced in the coil at position (1) zero. Because the conductor, at this instant is moving parallel to the lines of flux and therefore is not cutting   any lines.             At position 2 the voltage induced in the coil is maximum because the conductors are moving at right angle to the lines of flux. The direction of the current in accordance with Fleming right-handle rule, is shown in the diagram.             The voltage is again zero in position 3. Just as it was at position (1). coil side A is now at the bottom instead of at the top.             At position 4, the voltage is again at a maximum as at position. Applying Fleming’s rig...

Starting from the fundamental form of Faraday’s law, derive a tangible equation for the induced voltage in a conductor of length l moving in a magnetic field of flux density B with a velocity v perpendicular to the magnetic field Figure 1: Conductor moving perpendicular to magnetic field.             According to Faraday’s law in order to induce voltage in a conductor we must have: ·                      Magnetic field (B). ·                      Conductor (l). ·                      Motion (v). If the conductor is moved through a magnetic field a voltage is induced in the conductor. The induced voltage is propor...

The voltage induced in a conductor rotating in a magnetic field is alternating in nature Imagine the coil to be rotating in clock wise direction. We know an e. m. f. is induced in it which is proportional to the rate of change of flux linkages. When the plane of the coil is at right angles to lines of flux i.e. when it is in position, 1, then flux linked with the coil is maximum but rate of change of flux linkage is minimum. As the coil continues rotating further, the rate of change of flux linkage increases, till position 3 is reached where    Ѳ=90. But at position 1, where   Ѳ=0 the flux linked with the coil is minimum. In the next quarter revolution i.e. from 90 to 180, the flux linked with the coil gradually increase but the rate of flux linkages decreases. Hence, the induced e. m. f. decreases gradually till position 5 of the coil; it is reduced to zero value.    So, we find that in the first half revolution of the coil , no (or minimum) ...