Multilayered wound coil, stator, and manufacturing method therefor

A multilayered wound coil for being inserted in a split type stator core including a conductor wound into a rectangular shape having a long side and a short side in a plurality of layers (n layers),

• wherein the conductor is wound from an outer layer toward an inner layer in a first row, from the inner layer toward the outer layer in a second row, from the outer layer toward the inner layer in a third row, from the inner layer toward the outer layer in a fourth row, and from the outer layer toward the inner layer in a fifth row,
• the coil has an outer end portion positioned on an outer circumferential side and an inner end portion positioned on an inner circumferential side, each protruding from the coil in an axial direction of the stator,
• the coil includes a coil end on a lead side having the outer and inner end potions and a coil end on a non-lead side not having the outer and inner end portions, both the coil ends protruding from an end surface of the state core in the axial direction,
• the number of layers wound around the split type stator core in a coil end on the non-lead side is n, and the number of layers wound around the split type stator core in a coil end on a lead side is n+1 or more, and
• wherein the coil includes:
• a first bridging portion and a third bridging portion formed in an innermost layer in the coil end on the lead side and arranged in positions corresponding to alternate ones of the first to fourth rows in the radial direction so that the first bridging portion connects the first row and the second row and the third bridging portion connects the third row and the fourth row,
• a second bridging portion and a fourth bridging portion formed in an outermost layer in the coil end on the lead side and arranged in positions corresponding to alternate ones of the first to fourth rows in the radial direction so that the second bridging portion connects the second row and the third row and the fourth bridging portion connects the fourth row and the fifth row, and
• the first bridging portion, the third bridging portion, the second bridging portion, and the fourth bridging portion being arranged in a staggered pattern in a cross section of the coil end on the lead side.

A method of manufacturing a split type stator including a coil wound in a rectangular shape having a long side and a short side in a plurality of layers (n layers) in a circumferential direction of a stator core, the coil being inserted in a slot portion formed in the stator core,

• wherein the coil is formed by winding a conductor from an outer layer toward an inner layer in a first row, from the inner layer toward the outer layer in a second row, from the outer layer toward the inner layer in a third row, from the inner layer toward the outer layer in a fourth row, and from the outer layer toward the inner layer in a fifth row,
• the coil has an outer end portion positioned on an outer circumferential side and an inner end portion positioned on an inner circumferential side, each protruding from the coil in the axial direction of the stator,
• the coil includes a coil end on a lead side having the outer and inner portions and a coil end on a non-lead side not having the outer and inner end portions, both the coil ends protruding from an end surface of the state core in the axial direction,
• the number of layers wound around the split type stator core in a coil end on the non-lead side is n, and the number of layers wound around the split type stator core in a coil end on a lead side of the coil is n+1 or more, and
• the coil includes:
• a first bridging portion and a third bridging portion formed in an innermost layer in the coil end on the lead side and arranged in positions corresponding to alternate ones of the first to fourth rows in the radial direction so that the first bridging portion connects the first row and the second row and the third bridging portion connects the third row and the fourth row,
• a second bridging portion and a fourth bridging portion formed in an outermost layer in the coil end on the lead side and arranged in positions corresponding to alternate one of the first to fourth rows in the radial direction so that the second bridging portion connects the second row and the third row and the fourth bridging portion connects the fourth row and the fifth row, and
• the first bridging portion, the third bridging portion, the second bridging portion, and the fourth bridging portion being arranged in a staggered pattern in a cross section of the coil end on the lead side.