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PURPOSE : A rotor of a pole transform synchronous motor and a manufacturing method thereof are provided to maintain a magnetization degree by an exciting pole regularly by installing a protection tube in a surface of a magnet layer.CONSTITUTION : A plurality of conductors(120) is arranged along an edge of a rotor core(110). A magnet layer(130) includes magnetic material capable of re-magnetization by an exciting pole. A protection tube(140) is installed so as to be closely contacted in an outer circumference of the rotor core. The protection tub is a thermal shrinkage tube. The magnet layer includes a rare earth bonded magnet. The magnet layer is formed by mixing a binder to power of rare earth type alloy(Nd-Fe-B Alloy).COPYRIGHT KIPO 2010