What will happen if the excitation of normally operating unloaded salient pole synchronous motor suddenly gets disconnected? When the excitation of normally operating unloaded salient pole synchronous motor suddenly gets disconnected, induction torque disappears but reluctance torque independent on excitation , hence rotor remain in synchronism due to reluctance torque alone based on reluctance principle .So synchronous motor continue to run as a variable reluctance motor. What is Reluctance torque? Reluctance torque is created due to the saliency of the rotor. Reluctance in a magnetic circuit is analogous to resistance in Electric circuit. It is like the resistance offered to the magnetic flux lines by the medium. Metals like Iron provide a low reluctance path and the flux lines 'like' to pass through the least reluctance path. The least reluctance path is alo...
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