Inter-phase insulating paper, motor, and assembly method for inter-phase insulating paper

A motor, wherein:

• a plurality of first phase coils, second phase coils, and third phase coils which have different phases from each other are arranged in a stator core in a circumferential direction, and a plurality of insulating papers configured to perform inter-phase insulation of each phase coil are mounted, the insulating paper including a pair of leg portions to be respectively inserted into a pair of slots among a plurality of slots formed in the stator core, and a pair of flat portions connected to the pair of leg portions and protruding from both end surfaces of the stator core in an axial direction to perform the inter-phase insulation of each phase coil, and the pair of leg portions being connected to a central portion of an edge of the flat portion, and being disposed in a manner of sandwiching one tooth disposed between the slots adjacent to each other,
• the insulating paper includes:
• a first insulating paper in which the leg portions are respectively inserted into a pair of the slots on which a pair of the second phase coils adjacent to each other in the circumferential direction are to be mounted respectively, one side of the flat portion in the circumferential direction is sandwiched between the first phase coil and the second phase coil, and the other side of the flat portion in the circumferential direction is sandwiched between the third phase coil and the first phase coil, and
• a second insulating paper disposed on an inner peripheral side of the stator core with respect to the first insulating paper, in which the leg portions are respectively inserted into a pair of the slots on which a pair of the third phase coils adjacent to each other in the circumferential direction are to be mounted respectively, one side of the flat portion in the circumferential direction is sandwiched between the second phase coil and the third phase coil, and the other side of the flat portion in the circumferential direction is sandwiched between the third phase coil and the first phase coil,
• a plurality of the first insulating papers are arranged in a manner of circulating in the circumferential direction, and the first insulating papers adjacent to each other in the circumferential direction overlap each other in the circumferential direction, and
• a plurality of the second insulating papers are arranged in a manner of circulating in the circumferential direction, and the second insulating papers adjacent to each other in the circumferential direction overlap each other in the circumferential direction.

An assembly method for an inter-phase insulating paper, in which a plurality of first phase coils, second phase coils, and third phase coils which have different phases from each other are mounted on a stator core in a state of being arranged in a circumferential direction, and a plurality of insulating papers are mounted on the stator core in a manner of circulating in the circumferential direction to perform inter-phase insulation between the first phase coils, the second phase coils, and the third phase coils, the insulating paper including a pair of leg portions to be respectively inserted into a pair of slots among a plurality of slots formed in the stator core, and a pair of flat portions connected to the pair of leg portions and protruding from both end surfaces of the stator core in an axial direction to perform the inter-phase insulation of each phase coil, the pair of leg portions being connected to a central portion of an edge of the flat portion, and being disposed in a manner of sandwiching one tooth disposed between a pair of the slots adjacent to each other, a circumferential length of the flat portion being set such that the flat portions of a pair of the insulating papers adjacent to each other overlap each other in the circumferential direction when the insulating papers are mounted on the stator core, and the number of the insulating papers to be mounted on the stator core in a manner of circulating in the circumferential direction being set to be the same as the number of a plurality of coils having the same phase mounted on the stator core in a state of being arranged in a manner of circulating in the circumferential direction, the assembly method comprising:

• after mounting the first phase coils on the stator core and bending each coil end of the first phase to an outer peripheral side of the stator core, inserting the leg portions respectively into a pair of the slots adjacent to each other on which a pair of the second phase coils adjacent to each other in the circumferential direction are to be mounted respectively, and bending a portion of the flat portion overlapping the first phase coil in the circumferential direction to an inner peripheral side of the stator core;
• bending each coil end of the second phase coils and a portion of the flat portion facing the coil end to the outer peripheral side of the stator core when mounting the second phase coils to the stator core;
• and
• after the second phase coils are mounted on the stator core and before the third phase coils are mounted on the stator core, inserting the leg portions respectively into a pair of the slots adjacent to each other on which a pair of the third phase coils adjacent to each other in the circumferential direction are to be mounted respectively, and bending a portion of the flat portion overlapping the first phase coil and the second phase coil in the circumferential direction to the inner peripheral side of the stator core.