JP6917484B2 - Motor bus ring structure - Google Patents

Description

The present invention relates to a bus ring structure of a motor.

Bus rings for motors mounted on hybrid vehicles and electric vehicles are a plurality of ring-shaped conductive members called bus bars that electrically connect coils of the same phase among a plurality of coils arranged in the circumferential direction on the stator core. Have a laminated structure in a state of being insulated from each other. The bus ring is integrally molded, for example, by pouring resin into a mold while holding the bus bars at predetermined intervals.

Patent Document 1 describes that a plurality of bus bars are positioned at predetermined intervals using a holding pin having a stepped portion whose diameter becomes smaller as it is closer to the tip portion, arranged in a mold, and integrally molded with a resin. ing.

Japanese Unexamined Patent Publication No. 2010-11658

In Patent Document 1, since the holes corresponding to the holding pins are formed in the stacking direction of the bus bars in the bus ring, there is a possibility that the insulating property may be deteriorated such that a gap is generated between the bus bars and a short circuit occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to realize a bus ring structure that prevents deterioration of insulation between bus bars.

In order to solve the above problems and achieve the object, in the first embodiment of the present invention, a plurality of ring-shaped conductive bus bars (2U, 2V, 2W, 2C) are provided with insulating spacers (10). The structure of the bus ring (1) is integrally formed in a state of being laminated in the axial direction via the spacer (10), and the spacer (10) of the bus bar (2U, 2V, 2W, 2C) covers the entire circumference of the bus bar (2U, 2V, 2W, 2C). It has a ring shape that overlaps the plane portion in the axial direction, the inner diameter of the spacer (10) is smaller than the inner diameter of the bus bar (2U, 2V, 2W, 2C), and the outer diameter of the spacer (10) is the bus bar (2U). , 2V, 2W, 2C) is smaller than the outer diameter, and the side edge portion (10c) on the outer diameter side of the spacer (10) has a shape protruding toward the outer diameter side.

Further, in the second embodiment according to the present invention, in the first embodiment, the side edge portion (10c) on the outer diameter side of the spacer (10) is provided with a protruding portion (15) protruding outward. It is characterized by being.

Further, in the third embodiment according to the present invention, in the second embodiment, the protruding portion (15) is predetermined in the entire circumference or the circumferential direction at the side edge portion (10c) on the outer diameter side of the spacer (10). It is provided at intervals of.

Further, in the fourth embodiment according to the present invention, in the first embodiment, a step-shaped notch (16) is provided at the side edge portion (10c) on the outer diameter side of the spacer (10). It is characterized by being.

Further, in the fifth embodiment according to the present invention, in the fourth embodiment, the notch portion (16) is formed in the entire circumference or the circumferential direction at the side edge portion (10c) on the outer diameter side of the spacer (10). It is characterized in that it is provided at a predetermined interval.

Further, in the sixth embodiment according to the present invention, in the fourth or fifth embodiment, the notch portion (16) is in the stacking direction at the side edge portion (10c) on the outer diameter side of the spacer (10). It is characterized in that it is provided on at least one of an upper surface portion (10c1) and a lower surface portion (10c2).

Further, in the seventh embodiment according to the present invention, in the first or second embodiment, the spacer (10) has a slit (17) penetrating between the inner diameter side and the outer diameter side of the spacer (10). Is provided.

Further, in the eighth aspect according to the present invention, in the seventh aspect, the slit (17) is formed on at least one of the upper surface portion (10a) and the lower surface portion (10b) in the stacking direction of the spacer (10). It is characterized in that it is provided.

Further, in the ninth form according to the present invention, in the seventh or eighth form, the slit (17) is at least the upper surface portion (10a) and the lower surface portion (10b) in the stacking direction of the spacer (10). It is characterized in that one of them is provided at a predetermined interval in the circumferential direction.

Further, in the tenth aspect according to the present invention, in any one of the first to ninth forms, the side edge portion (5W, 5V) on the inner diameter side of the bus bar and the spacer (10) adjacent to the bus bar. A concave cross-sectional portion (11) is formed between the axial flat portion (10a, 10b) of the bus bar, and the protruding shape and the axial flat portion (10a,) of the bus bar adjacent to the spacer (10). A recess is formed between the vehicle and 10b).

According to the present invention, it is possible to realize a bus ring structure that prevents a decrease in insulation between bus bars.

Specifically, according to the first aspect of the present invention, the spacer (10) is configured to protrude inward from the inner diameter of the bus bar (2), so that the resin (21) is formed in the mold (20). A concave cross-sectional space that guides the air (13) pushed out by the resin (21) poured into the mold (20) between the inner diameter side of the bus bar (2) and the inner diameter side of the spacer (10) when poured. Since (11) is formed, it is possible to prevent the bus bars from being short-circuited even if a gap (12) is generated.

Further, the outer diameter of the spacer (10) can be made smaller than the outer diameter of the bus bar (2), and shapes (15, 17) are provided so as to protrude from the side edge portion (10c) on the outer diameter side of the spacer (10). As a result, the radial length of the side edge portion (10c) on the outer diameter side of the spacer (10) is secured, and the protruding shape portions (15, 16) of the bus bar (2) and the spacer (10) on the outer diameter side are secured. Since the air (13) pushed out by the resin (21) poured into the mold (20) can be guided between the above, the bus bars will be short-circuited even if a gap (12) is generated by the air (13). Can be prevented.

Further, according to the second aspect of the present invention, the outer diameter of the spacer (10) can be made smaller than the outer diameter of the bus bar (2), and the side edge portion (10c) on the outer diameter side of the spacer (10). ) Is provided with the protruding portion (15), so that the resin (21) poured into the mold (20) is provided between the protruding portion (15) of the bus bar (2) and the spacer (10) on the outer diameter side. Since a space for guiding the extruded air (13) is formed, it is possible to prevent the bus bars from being short-circuited even if a gap (12) is generated by the air (13).

Further, according to the third aspect of the present invention, the air (13) can be efficiently guided to the space between the bus bar (2) and the protrusion (15) of the spacer (10), so that the air (13) can be used. Even if a gap (12) is generated, the bus bars will not be short-circuited.

Further, according to the fourth aspect of the present invention, the outer diameter of the spacer (10) can be made smaller than the outer diameter of the bus bar (2), and the side edge portion (10c) on the outer diameter side of the spacer (10). ) Is provided with the notch (16), so that the resin (21) poured into the mold (20) between the bus bar (2) on the outer diameter side and the notch (16) of the spacer (10). Since a space for guiding the air (13) pushed out by the air (13) is formed, it is possible to prevent the bus bars from being short-circuited even if a gap (12) is generated by the air (13).

Further, according to the fifth or sixth embodiment of the present invention, the air (13) can be efficiently guided to the space between the bus bar (2) and the notch (16) of the spacer (10), so that the air (13) can be efficiently guided. Even if a gap (12) is generated due to (13), the bus bars are not short-circuited.

Further, according to any of the seventh to ninth forms according to the present invention, the air (13) extruded by the resin (21) is located on the inner diameter side (13) by providing the spacer (10) with the slit (17). It becomes easier to escape from the outer diameter side (outer diameter side) to the outer diameter side (inner diameter side), and the air (13) can be absorbed by the slit (17). Further, since the resin (21) also flows through the slit (17), the resin (21) is also filled in the slit (17).

Further, according to the first 0 embodiment of the present invention, when pouring the resin (21) to the mold (20), the spacer (10 adjacent the side edges and the bus bar of the inner diameter side of the bus bar (2) ) Is formed with a concave cross-sectional portion (11) for guiding the air (13) pushed out by the resin (21) poured into the mold (20), so that the air (13) is formed. ) Causes a gap (12) to prevent the bus bars from short-circuiting each other.

Further, since a recessed portion (wedge-shaped cross-sectional space or stepped cross-sectional space) is formed between the protruding shape of the spacer (10) and the axially flat portion of the bus bar (2) adjacent to the spacer (10). , The air (13) pushed out by the resin (21) poured into the mold (20) is easily guided to the recessed portion, and even if a gap (12) is generated by the air (13), the bus bars are short-circuited. Can be prevented.

It is an external view of the front surface (a) and the back surface (b) of the bus ring of this embodiment. It is sectional drawing which shows typically the structure of the bus ring of Embodiment 1. FIG. It is sectional drawing (a) which shows typically the structure of the bus ring of Embodiment 2, and sectional drawing (b) which shows typically the inside of a mold. It is sectional drawing which shows the structure which provided the cutout part in the spacer of Embodiment 2. It is an external view which shows the structure of the spacer of Embodiment 2. It is sectional drawing which shows typically the structure of the bus ring of Embodiment 3. FIG. 5 is a cross-sectional view showing a structure in which a notch is provided in the spacer of the third embodiment. It is an external view which shows the structure of the spacer of Embodiment 3. It is sectional drawing (a) which shows typically the structure of the bus ring of Embodiment 4, and the external view (b) which shows the structure of a spacer. It is sectional drawing (a) which shows typically the inside of the mold including the structure of the conventional bus ring, and sectional views (b), (c) which show the structure of the conventional bus ring.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

[overall structure]
Hereinafter, the overall configuration of the bus ring 1 of the present embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is an external view of the front surface (a) and the back surface (b) of the bus ring of the present embodiment. FIG. 2 is a cross-sectional view schematically showing the structure of the bus ring of the first embodiment.

The bus ring 1 of the present embodiment is a component that constitutes a part of a stator in a three-phase AC brushless motor as an electric motor or a generator mounted on a hybrid vehicle, an electric vehicle, or the like. The stator includes a plurality of cores in which a coil is wound around an iron core and a bus ring, and a rotor composed of magnets is arranged so as to face the cores. The bus ring 1 is formed by laminating a plurality of ring-shaped conductive members called bus bars that electrically connect cores of the same phase among a plurality of cores arranged at equal intervals in the circumferential direction in a state of being insulated from each other. Has a structure.

As shown in FIGS. 1 and 2, the bus ring 1 is formed by pressing a conductive metal material into a first bus bar 2U, a second bus bar 2V, a third bus bar 2W, and a fourth bus bar. It has 2C. The first bus bar 2U is connected to the W phase terminal in the drive circuit by the first terminal connection portion 3U. The second bus bar 2V is connected to the V-phase terminal in the drive circuit by the second terminal connection portion 3V. The third bus bar 2W is connected to the U-phase terminal in the drive circuit by the third terminal connection portion 3W. The fourth bus bar 2C is for the C phase (neutral phase) that is not connected to the drive circuit.

The first to fourth bus bars 2U, 2V, 2W, and 2C have first to fourth connection terminals 4U, 4V, 4W, and 4C extending from the outer diameter surface of the ring-shaped bar body. The first to fourth connection terminals 4U, 4V, 4W, and 4C are electrically connected to the coils of the cores of the respective phases arranged to face the bus ring 1.

The first to fourth bus bars 2U, 2V, 2W, 2C are the first to fourth bus bars 2U, 2V, 2W, at predetermined intervals via a ring-shaped spacer 10 which is an insulating resin molded product. They are stacked from top to bottom in the order of 2C. In the bus ring 1, the resin 21 is poured from the gate in a state where the first to fourth bus bars 2U, 2V, 2W, and 2C are held at predetermined intervals through the spacer 10 in the mold 20 described later in FIG. It is integrally molded.

[Embodiment 1]
Next, the structure of the bus ring of the first embodiment will be described with reference to FIG.

As shown in FIG. 2, in the bus ring 1 of the present embodiment, the outer diameter of the spacer 10 is outside the first to fourth bus bars 2U, 2V, 2W, 2C (hereinafter, may be collectively referred to as the bus bar 2). It is configured so that it is larger than the diameter and the inner diameter of the spacer 10 is smaller than the inner diameter of the bus bar 2. In this way, the spacer 10 is configured so as to protrude outward from the outer diameter of the bus bar 2 and inward from the inner diameter of the bus bar 2. Therefore, when the resin 21 is poured into the mold 20, it is outside the bus bar 2. Diameter side and inner diameter side side edges 5 (in the figure, outer diameter side and inner diameter side side edges 5V and 5W of the second bus bar 2V and the third bus bar 2W), and the second bus bar 2V and the third. A concave cross section that guides the air 13 pushed out by the resin 21 poured into the mold 20 between the upper surface portion 10a and the lower surface portion 10b in the stacking direction on the outer diameter side and the inner diameter side of the spacer 10 adjacent to the bus bar 2W. Space 11 can be formed.

According to the present embodiment, even if a gap (air pool) 12 is generated in the concave cross-sectional space 11 by the air 13 extruded by the resin 21 in the mold 20, there is a gap (air pool) 12 between the bus bars (second bus bar 2V and third bus bar 2W). Since the space (between) is covered with the spacer 10 and the resin 21, it is possible to prevent the bus bars (the second bus bar 2V and the third bus bar 2W) from being short-circuited.

<Explanation of issues>
Here, problems in the structure of the conventional bus ring will be described with reference to FIG.

10A and 10B are a cross-sectional view (a) schematically showing the inside of a mold including a conventional bus ring structure, and cross-sectional views (b) and (c) showing a conventional bus ring structure.

As shown in FIG. 10, the conventional bus ring 100 is configured such that the outer diameter of the spacer 101 is smaller than the outer diameter of the bus bar 2 and the inner diameter of the spacer 101 is larger than the inner diameter of the bus bar 2. That is, the conventional bus ring 100 has a configuration in which neither the outer diameter nor the inner diameter of the spacer 101 protrudes from the outer diameter and the inner diameter of the bus bar 2.

In such a conventional structure of the bus ring 100, the air 13 extruded when the resin 21 is poured into the mold 20 escapes from the concave cross-sectional space 102 formed between the bus bars on the outer diameter side and the inner diameter side and by the spacer 101. Since it is difficult, there is an inconvenience that the gap 12 is formed by the accumulation of the air 13 in the concave cross-sectional space 102, and the insulating property is deteriorated.

The following two factors 1 and 2 can be considered as the reason why the insulation between the bus bars 2 is lowered due to the occurrence of the gap 12 described above.

Factor 1: As shown in FIG. 10B, in the gap 12 generated in the concave cross-sectional space 102, each side edge portion on the outer diameter side and the inner diameter side of the spacer 101 (in the figure, the side edge portion on the inner diameter side is enlarged). The adjacent bus bars are short-circuited via the spacer 101 due to the occurrence of tracking along the above).

Factor 2: As shown in FIG. 10 (c), the whiskers generated in the plating material on the surface of the bus bar grow in the gap 12 generated in the concave cross-sectional space 102, and the electric charges are concentrated on the whiskers to spark. Adjacent bus bars are short-circuited via the spacer 101.

In response to factors 1 and 2 that reduce the insulating property, the bus ring 1 of the present embodiment has the spacer 10 protruding outward from the outer diameter of the bus bar 2 and inward from the inner diameter of the bus bar 2. Due to the configuration, even if a gap 12 is generated in the concave cross-sectional space 11, the space between the bus bars 2 (between the second bus bar 2V and the third bus bar 2W) is covered with the spacer 10 and the resin 21, so that the spacer 10 is used. It is possible to prevent the adjacent bus bars (second bus bar 2V and third bus bar 2W) from being short-circuited.

[Embodiment 2]
Next, the structure of the bus ring of the second embodiment will be described with reference to FIGS. 3 to 5.

FIG. 3 is a cross-sectional view (a) schematically showing the structure of the bus ring of the second embodiment and a cross-sectional view (b) schematically showing the inside of the mold.

The bus ring 1 of the first embodiment is configured such that the spacer 10 protrudes outward from the outer diameter of the bus bar 2 and inward from the inner diameter of the bus bar 2, and the air 13 pushed out by the resin 21 into the concave cross-sectional space 11. It was a configuration that induces.

However, the outer diameter of the spacer 10 may not be larger than the outer diameter of the bus bar 2 due to size restrictions of the bus ring 1.

As an effective structure in such a case, in the bus ring 1 of the present embodiment, as shown in FIG. 3, only the inner diameter of the spacer 10 is made larger than the inner diameter of the bus bar 2, and the outer diameter of the spacer 10 is the bus bar 2. A ridge-shaped protruding portion 15 having a tapered inclined surface protruding toward the outer diameter side is formed on the side edge portion on the outer diameter side of the spacer 10 so as to be smaller than the outer diameter. There is.

According to the present embodiment, the spacer 10 is configured to protrude inward from the inner diameter of the bus bar 2, so that when the resin 21 is poured into the mold 20, the inner diameter side of the bus bar 2 and the inner diameter side of the spacer 10 Since a concave cross-sectional space 11 for guiding the air 13 pushed out by the resin 21 poured into the mold 20 is formed between the two bus bars (the second bus bar 2V and the third bus bar 2V and the third bus bar 2V) even if a gap 12 is generated. It is possible to prevent the bus bar 2W) from being short-circuited.

Further, in the bus ring 1 of the present embodiment, the outer diameter of the spacer 10 can be made smaller than the outer diameter of the bus bar 2, and the protruding portion 15 is provided on the side edge portion 10c on the outer diameter side of the spacer 10. The length of the side edge portion 10c on the outer diameter side of the spacer 10 in the radial direction is secured, and a wedge-shaped cross-sectional space is formed between the bus bar 2 and the protruding portion 15 of the spacer 10 in the concave cross-sectional space 102 on the outer diameter side. As a result, the air 13 pushed out by the resin 21 poured into the mold 20 is easily guided to the wedge-shaped cross-sectional space. In this way, even if a gap 12 is generated in the concave cross-sectional space 102, it is possible to prevent the bus bars from being short-circuited.

By making the protruding portion 15 provided on the side edge portion on the outer diameter side of the spacer 10 sharp in a ridge shape, the growth direction of the whiskers can be deflected so as to move away from the bus bar 2. Since the whiskers are soft, the bus bars do not short-circuit through the protruding portion 15 of the spacer 10.

FIG. 4 is a cross-sectional view showing a structure in which the spacer of the second embodiment is provided with a notch. FIG. 5 is an external view showing the structure of the spacer of the second embodiment.

Instead of the protruding portion 15 in FIG. 3, a stepped notch portion 16 may be provided on the side edge portion 10c on the outer diameter side of the spacer 10 as shown in FIG. The notch portion 16 has an upper surface portion 10c1 and a lower surface portion 10c2 in the stacking direction at the side edge portion 10c on the outer diameter side of the spacer 10 as shown in FIG. 4A, or a spacer as shown in FIG. 4B. It is provided on the upper surface portion 10c1 (or the lower surface portion 10c2) in the stacking direction at the side edge portion 10c on the outer diameter side of the 10.

As shown in FIG. 5A, the protruding portion 15 and the notched portion 16 may be continuously provided on the side edge portion 10c on the outer diameter side of the spacer 10 over the entire circumference, or may be provided in FIG. 5 (b). ) May be provided at predetermined intervals in the circumferential direction. In the present embodiment, the projecting portions 15 and the notch portions 16 are provided at six positions at predetermined intervals in the circumferential direction, for example, at 30 ° intervals. Further, the protruding portion 15 and the cutout portion 16 are provided on both the upper surface portion 1c1 and the lower surface portion 10c2 or at least one of the upper surface portion 10c1 and the lower surface portion 10c2 on the side edge portion 10c on the outer diameter side of the spacer 10. .. When provided on the upper surface portion 10c1 and the lower surface portion 10c2, the protrusions 15 or cutouts 16 on one side and the protrusions 15 or cutouts 16 on the other side are provided alternately in the circumferential direction. The shape of the protruding portion 15 and the cutout portion 16 is not limited to the stepped shape, and may be any shape such as a curved surface shape as long as the structure can efficiently guide the air 13.

In this way, even when the notch portion 16 is provided on the side edge portion 10c on the outer diameter side of the spacer 10, a step shape is formed between the bus bar 2 and the notch portion 16 of the spacer 10 in the concave cross-sectional space 102 on the outer diameter side. A cross-sectional space is formed. Then, the air 13 pushed out by the resin 21 poured into the mold 20 is easily guided to the stepped cross-sectional space. In this way, even if a gap 12 is generated in the concave cross-sectional space 102, it is possible to prevent the bus bars from being short-circuited.

As described above, according to the structure of the bus ring 1 of the present embodiment, when the outer diameter of the spacer 10 is made smaller than the outer diameter of the bus bar 2, a protruding portion is projected on the side edge portion 10c on the outer diameter side of the spacer 10. By providing the 15 and the notch portion 16, the air 13 is guided to the protruding portion 15 and the wedge-shaped cross-sectional space and the stepped cross-sectional space between the notch 16 and the bus bar 2 in the concave space 102, and the gap 12 is formed. Therefore, it is possible to prevent the bus bars from being short-circuited.

[Embodiment 3]
Next, the structure of the bus ring of the third embodiment will be described with reference to FIGS. 6 to 8.

6 and 7 are cross-sectional views schematically showing the structure of the bus ring of the third embodiment. FIG. 8 is an external view showing the structure of the spacer of the third embodiment.

The bus ring 1 of the second embodiment is configured such that only the inner diameter of the spacer 10 is larger than the inner diameter of the bus bar 2, the outer diameter of the spacer 10 is smaller than the outer diameter of the bus bar 2, and the outer diameter of the spacer 10 is smaller. The structure was such that the protruding portion 15 was formed on the side edge portion 10c on the radial side.

However, due to size restrictions of the bus ring 1, not only the outer diameter of the spacer 10 cannot be made larger than the outer diameter of the bus bar 2, but also the inner diameter of the spacer 10 cannot be made smaller than the inner diameter of the bus bar 2.

As an effective structure in such a case, in the bus ring 1 of the present embodiment, as shown in FIG. 6, the outer diameter of the spacer 10 is smaller than the outer diameter of the bus bar 2, and the inner diameter of the spacer 10 is also the bus bar 2. The protrusion 15 is formed not only on the outer diameter side side edge portion 10c of the spacer 10 but also on the upper surface portion 10d1 and the lower surface portion 10d2 of the inner diameter side side edge portion 10d. Has been done. The configuration and function of the protrusion 15 are the same as those described with reference to FIG.

Further, instead of the protruding portion 15 of FIG. 6, as shown in FIG. 7, a stepped notch portion 16 may be provided. The cutout portion 16 is formed by the upper surface portion 10c1 and the lower surface portion 10c2 in the stacking direction at the side edge portion 10c on the outer diameter side of the spacer 10 as shown in FIG. 7A, or the spacer as shown in FIG. 7B. It is provided on the upper surface portion 10c1 (or the lower surface portion 10c2) in the stacking direction at the side edge portion 10c on the outer diameter side of the 10. The notch portion 16 has the same structure as that described with reference to FIG. Further, as shown in FIG. 8A, the protruding portion 15 and the cutout portion 16 are continuously provided on the outer diameter side side edge portion 10c and the inner peripheral side side edge portion 10d of the spacer 10 over the entire circumference. Alternatively, as shown in FIG. 8B, the spacer 10 may be provided on the outer diameter side side edge portion 10c at predetermined intervals and continuously provided on the inner peripheral side side edge portion 10d over the entire circumference. Then, as shown in FIG. 8C, the spacer 10 may be provided on the side edge portion 10d on the inner diameter side at a predetermined interval, and may be continuously provided on the side edge portion 10c on the outer peripheral side in the circumferential direction over the entire circumference. Then, as shown in FIG. 8D, the spacer 10 may be provided on the side edge portion 10c on the outer diameter side or the side edge portion 10d on the inner peripheral side at predetermined intervals in the circumferential direction.

Further, the protruding portion 15 and the cutout portion 16 are formed on both the upper surface portion 1c1 and the lower surface portion 10c2, or the upper surface portion 10c1 and the lower surface portion on the outer diameter side side edge portion 10c and the inner diameter side side edge portion 10d of the spacer 10. It is provided in at least one of 10c2. When provided on the upper surface portion 10c1 and the lower surface portion 10c2, the protrusions 15 or cutouts 16 on one side and the protrusions 15 or cutouts 16 on the other side are provided alternately in the circumferential direction.

The shape of the protruding portion 15 and the cutout portion 16 is not limited to the stepped shape, and may be any shape such as a curved surface shape as long as the structure can efficiently guide the air 13.

In this way, even when the notch portion 16 is provided in the side edge portion 10c on the outer diameter side or the side edge portion 10d on the inner diameter side of the spacer 10, the bus bar 2 and the spacer in the concave cross-sectional space 102 on the outer diameter side and the inner diameter side are provided. A stepped cross-sectional space is formed between the notches 16 of 10. Then, the air 13 pushed out by the resin 21 poured into the mold 20 is easily guided to the stepped cross-sectional space. In this way, even if a gap 12 is generated in the concave cross-sectional space 102, it is possible to prevent the bus bars from being short-circuited.

As described above, according to the structure of the bus ring 1 of the present embodiment, when the outer diameter of the spacer 10 is smaller than the outer diameter of the bus bar 2 and the inner diameter of the spacer 10 is larger than the inner diameter of the bus bar 2. By providing the protruding portion 15 and the notch portion 16 on the side edge portion 10c on the outer diameter side and the side edge portion 10d on the inner diameter side of the spacer 10, the protruding portion 15 and the notch portion 16 and the bus bar 2 in the concave space 102. Since the air 13 is guided into the wedge-shaped cross-section space or the stepped cross-section space between the spaces and the gap 12 is formed, it is possible to prevent the bus bars from being short-circuited with each other.

[Embodiment 4]
Next, the structure of the bus ring of the fourth embodiment will be described with reference to FIG.

FIG. 9 is a cross-sectional view (a) schematically showing the structure of the bus ring of the fourth embodiment and an external view (b) showing the structure of the spacer.

The bus ring 1 of the third embodiment is configured such that the outer diameter of the spacer 10 is smaller than the outer diameter of the bus bar 2, the inner diameter of the spacer 10 is also larger than the inner diameter of the bus bar 2, and the outer diameter of the spacer 10 is larger. Not only the side edge portion 10c on the diameter side but also the side edge portion 10d on the inner diameter side was formed with the protrusion 15 and the notch 16.

The bus ring 1 of the present embodiment is on the outer diameter side of the spacer 10 on the premise that the outer diameter of the spacer 10 is smaller than the outer diameter of the bus bar 2 and the inner diameter of the spacer 10 is also larger than the inner diameter of the bus bar 2. Instead of forming the protruding portion 15 and the notched portion 16 on the side edge portion 10c and the side edge portion 10d on the inner diameter side, as shown in FIG. 9B, the upper surface portion 10a and the lower surface portion 10b in the stacking direction of the spacer 10 Is provided with a plurality of slits 17. The slit 17 is a groove having a rectangular cross section that penetrates the upper surface portion 10a and the lower surface portion 10b in the stacking direction of the spacer 10 from the inner diameter side to the outer diameter side. The slits 17 are provided at six positions at predetermined intervals in the circumferential direction, for example, at intervals of 30 °. The slit 17 is provided in both the upper surface portion 10a and the lower surface portion 10b in the stacking direction of the spacer 10, or at least one of the upper surface portion 10a and the lower surface portion 10b. When provided on the upper surface portion 10a and the lower surface portion 10b, the slits on one side and the slits on the other side are provided alternately in the circumferential direction.

The cross-sectional shape of the slit 17 is not limited to a rectangular shape, and may be any shape such as a curved surface shape as long as the structure allows air 13 to easily escape.

When the spacer 10 is provided with the slit 17 as in the present embodiment, as shown in FIG. 9A, the air 13 extruded by the resin 21 easily escapes from the inner diameter side to the outer diameter side, and there is a gap in the concave space 102. The air 13 can be absorbed by the slit 17 so that the 12 is not generated. Further, since the resin 21 also flows from the space on the inner diameter side through the slit 17 to the outer diameter side, the resin 21 is also filled in the slit 17.

In the present embodiment, when the gate of the mold 20 is provided on the outer diameter side, the flow of the resin 21 changes from the outer diameter side to the inner diameter side, and the air 13 pushed out by the flow of the resin 21 also passes through the slit 17. It is configured to escape from the outer diameter side to the inner diameter side.

[Other Embodiments]
In the first embodiment, the inner diameter and the outer diameter of the spacer 10 protrude from the inner diameter and the outer diameter of the bus bar 2, and in the second embodiment, the inner diameter of the spacer 10 protrudes from the inner diameter of the bus bar 2. The outer diameter of the bus bar 2 may be such that only the outer diameter of the bus bar 2 protrudes from the outer diameter of the bus bar 2, and the side edge portion 10d on the inner diameter side may be provided with a protruding portion 15 or a notch portion 16 or may have a flat shape. Such a configuration is effective when the gate of the mold 20 is on the outer diameter side.

Further, the slit 17 of the fourth embodiment may be provided in the spacer 10 of the second embodiment or the third embodiment.

Further, in the second embodiment, when the amount of air 13 flowing to the outer diameter side is extremely small due to the air 13 guided to the concave cross-sectional space 11 on the inner diameter side between the bus bar 2 and the spacer 10, the side edge on the outer diameter side. The portion 10c may not be provided with the protruding portion 15 or the notched portion 16, and may have a flat shape, for example.

Further, in the third embodiment, the outer diameter side side edge portion 10c and the inner diameter side side edge portion 10d of the spacer 10 have the same shape, but the outer diameter side side edge portion 10c and the inner diameter side side edge portion 10d are formed. May have different shapes. For example, the protruding portion 15 may be provided on the side edge portion 10c on the outer diameter side, and the notch portion 16 may be provided on the side edge portion 10d on the inner diameter side.

The above-described embodiment is an example as a means for realizing the present invention, and the present invention can be applied to a modified or modified version of the following embodiment without departing from the spirit of the present invention. The structure of the bus ring 1 of the present embodiment can be applied to all motors.

1 ... Bus ring 2U ... 1st bus bar 2V ... 2nd bus bar 2W ... 3rd bus bar 2C ... 4th bus bar 3U ... 1st terminal connection 3V ... 2nd terminal connection 3W ... 3rd terminal Connection part 4C ... 4th connection terminal 4U ... 1st connection terminal 4V ... 2nd connection terminal 4W ... 3rd connection terminal 4C ... 4th connection terminal 5 ... Outer diameter side and inner diameter side of bus bar 2 Edge portion 5V ... Side edge portion 5W on the outer diameter side and inner diameter side of the second bus bar 2V ... Side edge portion 10 on the outer diameter side and inner diameter side of the third bus bar 2W ... Spacer 10a ... Outer diameter side and spacer 10 Upper surface portion 10b in the stacking direction on the inner diameter side ... Lower diameter portion 10c in the stacking direction on the outer diameter side and inner diameter side of the spacer 10 ... Side edge portion 10c1 on the outer diameter side of the spacer 10 ... Side edge portion 10c on the outer diameter side of the spacer 10 Top surface portion 10c2 in the stacking direction ... Lower surface portion 10d in the stacking direction at the side edge portion 10c on the outer diameter side of the spacer 10 ... Side edge portion 10d1 on the inner diameter side of the spacer 10 ... Lamination on the side edge portion 10d on the inner diameter side of the spacer 10 Upper surface portion 10d2 in the direction ... Lower surface portion 11 in the stacking direction at the side edge portion 10d on the inner diameter side of the spacer 10 ... Concave cross-sectional space 12 ... Gap 13 ... Air 15 ... Protruding portion 16 ... Notch 17 ... Slit 20 ... Mold 21 …resin

Claims (10)

The structure of the bus ring (1) is integrally formed with a plurality of ring-shaped conductive bus bars (2U, 2V, 2W, 2C) laminated in the axial direction via an insulating spacer (10). hand,
The spacer (10) has a ring shape that overlaps the axial plane portion of the bus bar over the entire circumference of the bus bar (2U, 2V, 2W, 2C).
The inner diameter of the spacer (10) is smaller than the inner diameter of the bus bar (2U, 2V, 2W, 2C).
The outer diameter of the spacer (10) is smaller than the outer diameter of the bus bar (2U, 2V, 2W, 2C).
A bus ring structure characterized in that a side edge portion (10c) on the outer diameter side of the spacer (10) has a shape protruding toward the outer diameter side. The bus ring structure according to claim 1, wherein the side edge portion (10c) on the outer diameter side of the spacer (10) is provided with a protruding portion (15) projecting outward. The second aspect of the present invention, wherein the protruding portions (15) are provided at predetermined intervals in the entire circumference or the circumferential direction at the side edge portion (10c) on the outer diameter side of the spacer (10). Bus ring structure. The bus ring structure according to claim 1, wherein the side edge portion (10c) on the outer diameter side of the spacer (10) is provided with a stepped notch portion (16). The fourth aspect of claim 4, wherein the notch portions (16) are provided at predetermined intervals in the entire circumference or the circumferential direction at the side edge portion (10c) on the outer diameter side of the spacer (10). Bus ring structure. The notch portion (16) is provided on at least one of the upper surface portion (10c1) and the lower surface portion (10c2) in the stacking direction in the side edge portion (10c) on the outer diameter side of the spacer (10). The bus ring structure according to claim 4 or 5. The bus ring structure according to claim 1 or 2, wherein the spacer (10) is provided with a slit (17) penetrating between the inner diameter side and the outer diameter side of the spacer (10). .. The bus ring structure according to claim 7, wherein the slit (17) is provided on at least one of an upper surface portion (10a) and a lower surface portion (10b) of the spacer (10) in the stacking direction. .. The claim is characterized in that the slits (17) are provided at least at least one of the upper surface portion (10a) and the lower surface portion (10b) in the stacking direction of the spacer (10) at predetermined intervals in the circumferential direction. The bus ring structure according to 7 or 8. A concave cross-sectional portion (11) is formed between a side edge portion (5W, 5V) on the inner diameter side of the bus bar and an axial flat portion (10a, 10b) of the spacer (10) adjacent to the bus bar. ,
Any of claims 1 to 9, wherein a recess is formed between the protruding shape and the axially flat portions (10a, 10b) of the bus bar adjacent to the spacer (10). The bus ring structure according to item 1.

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