Coil insertion device
A coil insertion device includes coil diameter expanders, the coil diameter expanders being configured to insert a coil assembly in a wound state into slots of a stator core by expanding the coil assembly in diameter from inside of the stator core, each of the coil diameter expanders includes: a coil presser that is arranged inside the coil assembly and presses coil end portions of the coil assembly outward from inside to expand the coil end portions in diameter; and a restrictor that is arranged outside the coil assembly, restricts outward movement of the coil end portions expanded in diameter by the coil presser, and sandwiches the coil end portions of the coil assembly inserted in the slots with the coil presser.
1 . A coil insertion device comprising coil diameter expanders, the coil diameter expanders being configured to insert a coil assembly in a wound state into slots of a stator core by expanding the coil assembly in diameter from inside of the stator core,
each of the coil diameter expanders comprising:
a coil presser that is arranged inside the coil assembly and presses coil end portions of the coil assembly outward from inside to expand the coil end portions in diameter; and
a restrictor that is arranged outside the coil assembly, restricts outward movement of the coil end portions expanded in diameter by the coil presser, and sandwiches the coil end portions of the coil assembly inserted in the slots with the coil presser, wherein
the coil presser includes a plurality of piece members arranged in an annular shape, a movable cylinder portion and a movable arm portion,
the movable arm portion is translated by the movable cylinder portion to expand in diameter the annular shape in which the plurality of piece members are arranged, and
each of the plurality of piece members has a substantially fan shape, and has a pair of fitting protrusions at one end portion in a circumferential direction.
2 . The coil insertion device according to claim 1 , wherein
the restrictor has an inner peripheral surface that is perpendicular to an end face of the stator core.
3 . The coil insertion device according to claim 1 , wherein
the restrictor has an inner peripheral surface as an inclined surface that is inclined outward in a radial direction with an increase in distance from an end face of the stator core.