Stator of a three-phase AC motor

Abstract

The stator of the three-phase AC motor disclosed herein includes: a stator core; a plurality of slots equally arranged circumferentially on the stator core; coils housed in each slot and having two pull-out wires extending from both ends of a winding wound in a coiled manner; and jumper wires connecting one of the two pull-out wires of one coil to one of the two pull-out wires of another coil in a coil group composed of coils of the same phase; and the coil group of the same phase includes a positive-direction coil group and a negative-direction coil group; in the positive-direction coil group of the same phase, the coils are connected by jumper wires according to the circumferential arrangement of the coils of that phase. Series connection; in the negative direction coil group of the same phase, the coils are connected in series by jumpers in the order of arrangement along the opposite direction of the circumference of the coils of that phase; the coil group of the second phase is arranged at a position offset by 120 degrees circumferentially from the coil group of the first phase, and the coil group of the third phase is arranged at a position offset by 240 degrees circumferentially from the coil group of the first phase; in the coil group of the same phase, the slots through which the pull-out wires electrically connected by the jumpers of the positive direction coil group are pulled out, and the slots through which the pull-out wires connected by the jumpers of the negative direction coil group are pulled out, are arranged symmetrically with respect to a common axis of symmetry.

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