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An induction motor is used for driving mechanical loads; Its efficiency is lesser than that of synchronous motor of the same output and voltage rating. Induction motor is cheaper than synchronous motor with same ratings; Induction motors are bit bigger in size than synchronous motor due to its construction.
Permanent magnet generators (PMG's) or alternators (PMA's) do not require a DC supply for the excitation circuit, nor do they have slip rings and contact brushes.he term synchronous refers here to the fact that the rotor and magnetic field rotate with the same speed, because the magnetic field is generated through a shaft mounted permanent magnet mechanism and current is induced into the stationary armature.