ROTOR CORE

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PROBLEM TO BE SOLVED : To provide a technique for an IPM motor, capable of reducing an amount of a heavy rare-earth element to be added and a component cost without degrading motor efficiency. SOLUTION : A rotor core 10 which extends in a rotary shaft direction and holds a permanent magnet 95 extending in the rotary shaft direction comprises : an inner peripheral surface 12 along which a shaft penetrates; an outer peripheral surface 14 arranged farther than the inner peripheral surface 12 from a rotary shaft Q; a first surface 16 arranged between the inner and outer peripheral surfaces 12 and 14, and exposed at the side of the outer peripheral surface 14; a second surface 18 arranged between the inner and outer peripheral surfaces 12 and 14, exposed at the side of the inner peripheral surface 12, and holding the permanent magnet 95 between the first surface 16 and itself; a fixing part 20a for fixing the permanent magnet 95 to either the first surface 16 or the second surface 18; a plurality of comb-tooth parts 22 exposed at a farther side from the permanent magnet 95 at a side of either the first surface 16 or the second surface 18, where the permanent magnet 95 is fixed, between the inner and outer peripheral surfaces 12 and 14; and a third surface 24 for facing the comb-tooth parts 22 via a gap and penetrating in the rotary shaft direction. COPYRIGHT : (C)2013, JPO&INPIT