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

Patent metadata

Field	Value
Publication number	US-12095326-B2
Application number	US-202118696165-A
Country	US
Kind code	B2
Filing date	Sep 30, 2021
Priority date	Sep 30, 2021
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

An inter-phase insulating paper, including: a plurality of insulating papers arranged in a stator core in a manner of circulating in a circumferential direction and configured to perform inter-phase insulation of each phase coil provided in the stator core, wherein the insulating paper includes 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 are connected to a central portion of an edge of the flat portion.

First claim

The invention claimed is:

1. 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.

2. The motor according to claim 1 , wherein:
when a circumferential length of the flat portion is A and a circumferential displacement amount of a pair of the insulating papers adjacent to each other when the insulating papers are mounted on the stator core is B, the flat portions of the pair of the insulating papers adjacent to each other overlap each other by satisfying a relationship of A>B.

3. The motor according to claim 1 , wherein:
the insulating paper has a planar shape before being mounted on the stator core.

4. The motor according to claim 1 , wherein:
an elongated hole is formed between the pair of leg portions in accordance with an outer shape of a tooth between a pair of the slots, and the tooth is to be inserted into the elongated hole.

5. The motor according to claim 4 , wherein:
a cutout is provided in the flat portion and at a position corresponding to a short side of the elongated hole.

6. The motor according to claim 1 , wherein:
the edge of the flat portion facing the stator core when the leg portion is inserted into the slot has an arc shape that extends in a direction orthogonal to a longitudinal direction of the leg portion from a position of the edge corresponding to a base of the leg portion, that is separated from the stator core from an intermediate position to an end of the flat portion, and that is convex in a direction separated from the stator core.

7. The motor according to claim 1 , wherein:
the number of the insulating papers to be mounted on the stator core in a manner of circulating in the circumferential direction is 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.

8. 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.

Assignees

• Nissan Motor

Inventors

• Ishiguro Kunitomo
• Ishikawa Takanori
• Iwasaki Daigo

Classifications

• H02K3/345

  between conductor and core, e.g. slot insulation · CPC title

• H02K3/34 Primary

  between conductors or between conductor and core, e.g. slot insulation · CPC title

• H02K3/38

  around winding heads, equalising connectors, or connections thereto · CPC title

• H02K15/10

  Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes · CPC title