Patent ID: 8072110

Claim:
A compressor comprising: a closed vessel; a compression element placed in the closed vessel, the compression element including a cylinder chamber, a roller disposed in the cylinder chamber and configured to revolve with an outer peripheral surface of the roller brought in contact with an inner peripheral surface of the cylinder chamber, and a blade cooperating with the roller for partitioning an inside of the cylinder chamber; and a motor placed in the closed vessel to drive the compression element via a shaft, the motor including a rotor including a plurality of circumferentially arranged slots, and a stator disposed radially outwardly of the rotor, the stator having an annular stator main body, and nine teeth that project radially inwardly from an inner peripheral surface of the stator main body, with coils are wound around each of the nine teeth in concentrated manner, each of the slots being formed into a rectangular shape extending in a direction perpendicular to a radial direction of the rotor when viewed from a rotational axis direction of the rotor, each rectangular slot having radially inner and outer parallel sides and circumferentially spaced parallel ends that are perpendicular to the radially inner and outer parallel sides, a size of each slot being set so that the two magnets received therein can mutually approach or separate in the slot, the magnets having a flat plate-like shape when viewed from the rotational axis direction of the rotor, and the two magnets received in each slot have radially outward portions that have an identical polarity of one of a south pole and a north pole, and radially inward portions that have an identical polarity of the other one of the south pole and the north pole such that there is a gap between the two magnets in the slot.