By D. P. Sen Gupta
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If Tis the mechanical torque (N m), then wT= EI. 58) where w is the rotor angular velocity (mechanical rad/s). 62) if the voltage is constant. 63) This shows that if the flux is weakened the speed will increase, and vice versa. When the field winding is energised, a magnetomotive force is set up which drives flux through the magnetic circuit. c. machines can be obtained by plotting the field current against the open-circuit voltage, the speed being maintained constant. The magnetic intensity H is given by the field ampere turns per unit length of the magnetic circuit.
C. machine, instead of slip rings we have a commutator. 10). 10 that brush 1 will be in contact only with that coil side which passes the upper side of the plane XX, and brush 2 will be connected to the coil-side that passes through the lower side. In this arrangement current will always flow from brush 1 to brush 2 through the coil. This means that the current through the brushes is always uni-directional. 1 0. Here the observer does not rotate with the coil all the way. In the particular case in which there are two commutator segments, he goes only halfway.
The rotor is therefore magnetised by the field set up by its own current. This magnet then 'chases' the stator magnet. The rotor cannot attain synchronous speed. f. and the rotor conductors, no voltage would be induced in the latter. As a result, the rotor would cease to develop its own field, and since torque is produced by the interaction of stator and rotor fields, there would be no torque. The rotor, therefore, settles at a sub-synchronous speed at which just enough tbrque is produced to overcome the torque imposed by the load, that is at a speed at which dynamic equilibrium is maintained.