JP2022191091A - Armature - Google Patents

Abstract

To provide an armature capable of easily welding the terminals of a first conductor and a second conductor.SOLUTION: A stator includes: an iron core formed with multiple slits penetrating in the direction the center line extends; and a first conductor 30A and a second conductor 30B with the terminals welded together. A first mating part 42 is formed on the first terminal 40 of the first conductor 30A, and on the second terminal 41 of the second conductor 30B, a second mating portion 44 is formed, which can be fitted with the first mating part 42.SELECTED DRAWING: Figure 11

Description

The present invention relates to an armature having an iron core and conductors assembled to the iron core.

2. Description of the Related Art Conventionally, as an armature of this type, for example, a stator of a rotary electric machine disclosed in Patent Document 1 is known. Such a stator (armature) has a cylindrical stator core (iron core) and coils attached to the stator core. A plurality of slots (slits) are formed in the stator core. A plurality of segment conductors (first conductors and second conductors) forming a coil are assembled in the slots. The coil is formed by welding the ends of different segment conductors assembled in the slots.

WO2015/147105

By the way, in the stator as described above, when the ends of the segment conductors different from each other are welded together, a wedge is used to keep the ends in contact with each other. For this reason, the welding operation between the ends of the segment conductors different from each other becomes complicated.

Means for solving the above problems and their effects will be described below.
An armature that solves the above problems is provided with an iron core provided with a plurality of slits penetrating in the direction in which the center line extends, and an armature assembled to the iron core so as to be inserted into the slits. An armature comprising a first conductor and a second conductor to be welded, wherein a first fitting portion is formed at an end of the first conductor, and the second conductor is formed at an end of the second conductor. The gist is that a second fitting portion that can be fitted with the first fitting portion is formed.

According to this configuration, by fitting the first fitting portion and the second fitting portion together, it is possible to maintain a state in which the ends of the first conductor and the second conductor are in contact with each other. Therefore, the welding operation between the ends of the first conductor and the second conductor can be easily performed.

1 is a perspective view of a stator of one embodiment; FIG. Sectional drawing of FIG. FIG. 3 is an enlarged view of a main portion of FIG. 2; The perspective view which shows a conductor. The perspective view which shows a state when assembling|attaching a conductor to the slit of an iron core. (a) is a side view of the 1st end part of a 1st conductor, (b) is a front view of (a). (a) is a plan view of the second end of the second conductor, (b) is a front view of (a). The front view which shows the state when engaging the 1st fitting part of the 1st end part of a 1st conductor, and the 2nd fitting part of the 2nd end part of a 2nd conductor. FIG. 9 is a side view of FIG. 8; The front view which shows the state when the 1st fitting part of the 1st end part of a 1st conductor and the 2nd fitting part of the 2nd end part of a 2nd conductor are engaged. FIG. 10 is an enlarged view of FIG. 10 viewed from direction A;

An embodiment of the armature will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, a stator 20 as an example of an armature in this embodiment is a stator of a three-phase electric motor and has a substantially cylindrical shape. The stator 20 includes an iron core 21 and coils 22 . The iron core 21 has a laminated structure in which a plurality of (for example, several hundred) annular metal plates are laminated.

The iron core 21 is provided with a plurality of (48 in this embodiment) slits 23 penetrating in the direction in which the center line L extends. Each slit 23 opens in the inner peripheral surface of iron core 21 and extends in the radial direction of iron core 21 . That is, each slit 23 is open on both sides in the direction in which the center line L of the iron core 21 extends and on the center side of the iron core 21 .

Each slit 23 has a rectangular shape extending in the radial direction of the core 21 when viewed from the direction in which the center line L of the core 21 extends, and is arranged at equal intervals in the circumferential direction of the core 21 . The coil 22 is wound around the iron core 21 so as to be inserted into the plurality of slits 23 of the iron core 21 . The iron core 21 is provided with three coils 22 corresponding to a U-phase coil, a V-phase coil, and a W-phase coil.

As shown in FIGS. 2 and 3, each coil 22 has a rectangular cross-sectional shape and is made of metal (aluminum in this embodiment). An insulating coating layer (not shown) is provided on the surface of each coil 22 . This coating layer insulates between the coils 22 adjacent in the radial direction of the iron core 21 within the slit 23 and between each coil 22 and the iron core 21 (inner surface of the slit 23).

Next, a method for manufacturing the stator 20 configured as described above will be described.
As shown in FIGS. 2 and 4, when manufacturing the stator 20, first, an iron core 21 provided with a plurality of slits 23 is prepared, and a plurality of conductors 30 forming a coil 22 are formed. The conductor 30 is made of metal (made of aluminum in this embodiment) and has a rectangular shape in cross section.

The conductor 30 has a substantially U-shape having two straight portions 31 extending in parallel and a curved portion 32 extending in a curved manner so as to connect one ends of the straight portions 31 . The surface of each conductor 30 other than the two end portions is provided with the above-described insulating coating layer (not shown). That is, the two end portions of each conductor 30 are not provided with the above-described insulating coating layer (not shown).

Subsequently, as shown in FIG. 5, a plurality of conductors 30 are sequentially inserted into the slits 23 and assembled to the iron core 21 . That is, the straight portions 31 of the conductors 30 are inserted into the corresponding slits 23 in the iron core 21, respectively. In this case, the pair of straight portions 31 of each conductor 30 is inserted across the two slits 23 . All the conductors 30 are assembled to the iron core 21 in this way. Note that FIG. 5 shows a state in which two conductors 30 are inserted into the iron core 21 .

Subsequently, a rectangular parallelepiped iron pressing member (not shown) is inserted into the slit 23 from the opening on the inner peripheral surface side of the iron core 21 in the slit 23, and all the conductors 30 in the slit 23 are pressed at once by the pressing member. Press. Then, as shown in FIG. 3, the conductor 30 made of aluminum, which is softer than the iron press member (not shown), is plastically deformed so as to be crushed according to the inner surface of the slit 23 .

The plastic deformation of each conductor 30 fills the gap between each conductor 30 and the inner surface of the slit 23 . Therefore, the space factor of each conductor 30 (coil 22) in the slit 23 of the iron core 21 is effectively improved.

After that, the ends of the plurality of conductors 30 are bent so as to approach each other and then joined by laser welding so that one coil 22 is formed by the plurality of conductors 30 . As a result, the coil 22 is attached to the iron core 21 . That is, the stator 20 in which the coils 22 are assembled to the iron core 21 is manufactured.

Next, the configuration of the ends of the plurality of conductors 30 joined in the above-described method of manufacturing the stator 20 will be described in detail. Here, the configuration of the end portions of two conductors 30 adjacent to each other in the slit 23 of the iron core 21 shown in FIG. 5 will be described. One of these two conductors 30 will be described as a first conductor 30A and the other as a second conductor 30B.

As shown in FIG. 5 , one of both ends of the conductor 30 is a first end 40 and the other is a second end 41 . That is, one of both ends of each of the first conductor 30A and the second conductor 30B is the first end 40 and the other is the second end 41 . When the ends of the first conductor 30A and the second conductor 30B are joined together, in this embodiment, the first end 40 of the first conductor 30A and the second end 41 of the second conductor 30B are joined. .

As shown in FIGS. 5, 6(a), and 6(b), the first end portion 40 of the first conductor 30A has a first fitting portion having a concave-convex shape on the surface on the inner peripheral side of the iron core 21. A portion 42 is formed. That is, the first fitting portion 42 is jagged when viewed from the width direction X of the linear portion 31 . That is, the first fitting portion 42 has a plurality of first step surfaces 43 extending in the width direction X of the linear portion 31 and aligned in the longitudinal direction Y of the linear portion 31 . Each first step surface 43 is perpendicular to the straight line extending in the longitudinal direction Y of the straight portion 31 .

As shown in FIGS. 5, 7(a), and 7(b), a first fitting portion 42 and a fitting portion 42 are fitted on the surface of the second end portion 41 of the second conductor 30B on the outer peripheral side of the iron core 21. A second fitting portion 44 having a possible uneven shape is formed. That is, the second fitting portion 44 is jagged when viewed from the longitudinal direction Y of the linear portion 31 . That is, the second fitting portion 44 has a plurality of second stepped surfaces 45 extending in the longitudinal direction Y of the linear portion 31 and aligned in the width direction X of the linear portion 31 . Each second stepped surface 45 is orthogonal to the straight line extending in the width direction X of the straight portion 31 .

As shown in FIGS. 8 and 9, the first fitting portion 42 and the second fitting portion 44 are the first end portion 40 of the first conductor 30A and the second conductor 30B which are welded when fitting. While the second ends 41 are relatively movable in the direction toward each other (the direction indicated by the arrows in FIGS. 8 and 9), the first end 40 of the first conductor 30A and the second end 40B of the second conductor 30B to be welded are made movable. A ratchet structure is formed in which the two ends 41 are relatively immovable in directions away from each other (directions opposite to the directions indicated by the arrows in FIGS. 8 and 9).

Next, in a state in which the first conductor 30A and the second conductor 30B are inserted into the slit 23 and attached to the iron core 21, the first end 40 of the first conductor 30A and the second end of the second conductor 30B are separated. 41 are joined by laser welding.

As shown in FIGS. 8 and 9, when joining the first end 40 of the first conductor 30A and the second end 41 of the second conductor 30B by laser welding, first, the following is performed. That is, the straight portions 31 of the first conductor 30A and the second conductor 30B are bent so that the first end 40 of the first conductor 30A and the second end 41 of the second conductor 30B are brought closer to each other.

At this time, the linear portions 31 of the first conductor 30A and the second conductor 30B are aligned with the first fitting portion 42 of the first end portion 40 of the first conductor 30A and the second end portion 41 of the second conductor 30B. 2 Bend so that the fitting portion 44 is engaged. Then, the first fitting portion 42 and the second fitting portion 44 are fitted while being gradually meshed with each other. At this time, the first fitting portion 42 and the second fitting portion 44 can relatively move toward each other (directions indicated by arrows in FIGS. 8 and 9), while moving away from each other (FIGS. 8 and 9). A ratchet structure is formed in which relative movement is impossible in the direction opposite to the direction indicated by the arrow 9).

Therefore, the springback of the straight portions 31 of the first conductors 30A and the second conductors 30B separates the first fitting portions 42 and the second fitting portions 44 from each other (directions indicated by arrows in FIGS. 8 and 9). and opposite direction) is restricted. Therefore, the first fitting portion 42 and the second fitting portion 44 are smoothly meshed with each other to form a concave-convex fit. At this time, the plurality of first stepped surfaces 43 of the first fitting portion 42 and the plurality of second stepped surfaces 45 of the second fitting portion 44 come into contact with each other.

As shown in FIGS. 10 and 11, in the state in which the first fitting portion 42 and the second fitting portion 44 are completely meshed and unevenly fitted, this state is maintained and the first conductor 30A and the second conductor 30A The angle B between the straight portions 31 of the two conductors 30B is a right angle. At this time, due to the concave-convex fitting of the first fitting portion 42 and the second fitting portion 44, a linear gap through which the laser can pass is formed between the first fitting portion 42 and the second fitting portion 44. Positioning of the first fitting portion 42 and the second fitting portion 44 is performed while preventing it from being possible.

After that, by irradiating the concave-convex fitting portion between the first fitting portion 42 and the second fitting portion 44 with a laser from the direction C in FIG. 10, the first fitting portion 42 and the second fitting portion 44 are Accurately laser welded. That is, the first end 40 of the first conductor 30A and the second end 41 of the second conductor 30B are joined by laser welding. At this time, since there is no gap between the first fitting portion 42 and the second fitting portion 44 through which the laser beam can pass, the laser beam is applied between the first fitting portion 42 and the second fitting portion 44 . It is not possible to illuminate an unintended position through a gap.

According to the embodiment detailed above, the following effects are exhibited.
(1) The stator 20 includes an iron core 21 provided with a plurality of slits 23 penetrating in the direction in which the center line L extends, and the ends of the stator 20 assembled to the iron core 21 so as to be inserted into the slits 23 . are welded to a first conductor 30A and a second conductor 30B. A first fitting portion 42 is formed at the first end portion 40 of the first conductor 30A, and a second fitting portion capable of fitting with the first fitting portion 42 is formed at the second end portion 41 of the second conductor 30B. 44 are formed.

According to this configuration, the first end portion 40 of the first conductor 30A and the second end portion 41 of the second conductor 30B are connected by fitting the first fitting portion 42 and the second fitting portion 44 together. Able to maintain contact. Therefore, the welding work between the first end portion 40 of the first conductor 30A and the second end portion 41 of the second conductor 30B can be easily performed.

(2) In the stator 20, the first fitting portion 42 and the second fitting portion 44 both have an uneven shape, and when fitted, the first end portion 40 of the first conductor 30A to be welded. While the second end 41 of the second conductor 30B can move relatively toward each other, the first end 40 of the first conductor 30A and the second end 41 of the second conductor 30B to be welded are It constitutes a ratchet structure that prevents relative movement in directions away from each other.

According to this configuration, the first end portion 40 of the first conductor 30A and the second end portion 41 of the second conductor 30B are bent so as to approach each other so that the first fitting portion 42 and the second fitting portion 44 are separated. Mate. At this time, the first fitting portion 42 and the second fitting portion 44 are released from the fitted state by springback, and the first end portion 40 of the first conductor 30A and the second end portion 41 of the second conductor 30B are separated. can be suppressed.

(Change example)
The above embodiment can be implemented with the following modifications. Moreover, the above embodiments and the following modified examples can be implemented in combination with each other within a technically consistent range.

- The 1st fitting part 42 and the 2nd fitting part 44 do not necessarily need to comprise uneven|corrugated shape.
- The 1st fitting part 42 and the 2nd fitting part 44 do not necessarily need to comprise the ratchet structure mentioned above.

- One of the first fitting portion 42 and the second fitting portion 44 may be configured by one convex portion, and the other may be configured by one concave portion that can be fitted to the convex portion.
- The first fitting portion 42 and the second fitting portion 44 each include an engaging portion that engages with each other to suppress relative movement in the direction in which they face each other when they are fitted to each other. may be

The angle B formed by the straight portions 31 of the first conductor 30A and the second conductor 30B is an obtuse angle when the first fitting portion 42 and the second fitting portion 44 are completely engaged with each other. It may be at an acute angle. In this case, the orientations of the first fitting portion 42 and the second fitting portion 44 are changed according to the angle B so that they mesh with each other.

- The armature according to the above embodiment is applicable not only to a three-phase motor but also to a single-phase motor. Further, the armature according to the above embodiment can also be applied to a rotor of a brush-type electric motor. In addition, the armature according to the above embodiments can also be applied to the armature of a generator.

DESCRIPTION OF SYMBOLS 20... Stator as an example of an armature 21... Iron core 22... Coil 23... Slit 30... Conductor 30A... First conductor 30B... Second conductor 31... Linear part 32... Curved part 40... First end 41... Second end Part 42... First fitting part 43... First step surface 44... Second fitting part 45... Second step surface B... Angle L... Center line X... Width direction Y... Longitudinal direction

Claims (2)

an iron core provided with a plurality of slits penetrating in the direction in which the center line extends;
a first conductor and a second conductor whose ends are welded to each other while being assembled to the core so as to be inserted into the slit;
an armature comprising
A first fitting portion is formed at an end portion of the first conductor, and a second fitting portion capable of being fitted with the first fitting portion is formed at an end portion of the second conductor. Armature characterized by: The first fitting portion and the second fitting portion both have an uneven shape. 2. A ratchet structure is formed in which relatively movable ends of the first conductor and the second conductor to be welded are prevented from moving relative to each other in a direction away from each other. Armature as described.

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