| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor with a built-in permanent magnet which can assure a sufficient internal diameter of a rotor without increase of an external diameter of the rotor, while maintaining a large output torque and also provide an injection molding machine provided with the motor with built-in permanent magnet. SOLUTION: The motor 2 with built-in permanent magnet 2 comprises a mother material 8 which is formed by integrally tightening a plurality of laminated annular steel plates 4 with non-magnetic material bolts 6 provided through the axial line direction, and magnetic belts 10 formed of a plurality of permanent magnets provided along the circumference at the area near the external circumference of this mother material 8. In this motor, an N magnetic belt 10a which is formed of a permanent magnet directed to the axial center side and is extended in the axial line direction, and an S magnetic belt 10b which is formed of a permanent magnet directed to the axial center side and is extended in the axial line direction, are alternately disposed with a gap kept in the circumferential direction, and the positions of the non-magnetic material bolts 6 are identified at the area near the magnetic belts on the shortest route connecting between the center of the circumferential direction of the magnetic belts 10 and the axial center.
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