Hybrid excitation IPM motor

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PROBLEM TO BE SOLVED : To generate a high torque in both a high-speed rotation zone and a low-speed rotation zone. SOLUTION : A hybrid excitation IPM motor includes : a stator 16 formed by winding an excitation winding 13 and a three-phase winding 15 around a circular soft steel disk 12; and a rotor 24 having a circular soft steel drum portion 21 which surrounds the excitation winding 13 in a recess shape via a gap G1 and magnetically continuing to the excitation winding 13 and having the inner circumferential portion of the circular shape fixed on the rotating shaft 22, wherein a circular laminate core 23 opposing the three-phase winding 15 is fixed to the outer circumferential surface of the soft steel drum portion 21 via a gap G2. Convex portions 25 whose number corresponds to the number of poles of the three-phase winding 15 are provided along the circumferential direction on the surface of the circular laminate core 23 which opposes the three-phase winding 15, each permanent magnet 26 made of a rare earth magnet is embedded in every other one of the convex portions 25 on the circular surface of the circular laminate core 23 so that a segment region 27a of a predetermined region can be formed on the outside circular surface of each of the permanent magnets 26 when the magnets are embedded, and a positive or negative current is applied to excite the excitation winding 13. COPYRIGHT : (C)2010, JPO&INPIT