PROBLEM TO BE SOLVED: To obtain a highly reliable coupling structure, having a stable coupling force between a bundling terminal and lead-out coils of a lead-out coil set, by joining the lead-out coils with the bundling terminal, in such a state that partial periphery of each lead-out coil is brought into contact with the terminal. SOLUTION: Neutral point lead-out coils 2N are alternately arranged in two stases in a staggered state, with three rows being arranged in the lower stage and four rows being arranged, including a neutral point output terminal N in the upper stage, so that the coils 2N in the upper stage cannot overlap the coils 2N in the lower stage. The arranged coils 2N are bundled by means of a bundling terminal 12, made of a copper-based material in a state where the coils 2N are electrically and mechanically coupled with the terminal 12 through a brazing material and, in addition, the coils 2N are press-contacted with each other. The coils 2N are composed of enameled conductors, namely, AIW wires and a copper alloy terminal which leads to good results, when the AIW wires jointing to the terminal by electric heating is used as the terminal 12. Therefore, a highly reliable coupling structure, having a stable coupling force, can be obtained between the bundling terminal an the lead-out coils.
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