Phase Synchronous Motor Starter Circuit
Operation of three phase synchronous motor starter circuit
During starting, a three phase synchronous motor opeerates as a normal onduction motor. After three phase power is connected to the system, all the three main comtacts “M” close and the auxilliary contacts change state, the normally opena contacts close while the normally closed contacts open. The three phase current then flows through the overload heaters into the the three motor stator leads. The current therefore flows through the stator windings causing a rotating magentic field. This rotating field interacts with the induction windings in the rotor causing it to rotate
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