JP6308680B2 - Manufacturing method of bus ring - Google Patents

Description

  The present invention relates to a method for manufacturing a single-phase bus ring and a neutral point bus ring in a bus ring unit that electrically connects end portions of a stator coil wound around a stator in a rotary electric motor.

FIG. 12 shows a schematic cross-sectional view of the rotary electric motor 200.
As shown in FIG. 12, the rotary motor 200 includes a substantially cylindrical stator 201, a rotor (not shown in FIG. 12 ) disposed in a central opening of the stator 201, and the stator 201. Are provided with a plurality of stator coils 202 wound around the plurality of teeth and a bus ring unit 210 for electrically connecting ends of the plurality of stator coils 202.

The bus ring unit 210 electrically connects the single-phase bus rings 211, 212, and 213 that electrically connect the in-phase stator coils 202 to the electrical neutral points of the plurality of stator coils 202. And a neutral point bus ring 215.
In FIG. 12 , the single-phase bus ring has three types of bus rings: a U-phase bus ring 211, a V-phase bus ring 212, and a W-phase bus ring 213.

The bus ring unit 210 includes both the axial direction and the radial direction of the stator while preventing the single-phase bus rings 211, 212, 213 and the neutral point bus ring 215 from interfering with each other. As a whole, it is possible to reduce the size of the device, and to facilitate the connection work between the end of the stator coil 202 and the single-phase bus rings 211, 212, 213 and the neutral point bus ring 215. It is desirable.

  For example, in Patent Document 1 below, a holder made of an insulating resin arranged on one side in the axial direction of a stator, first to third single-phase bus rings and a neutral point bus mounted on the holder A bus ring unit with a ring is disclosed.

  The holder opens on one side in the axial direction (the side opposite to the stator), and the first to third single-phase annular grooves in which the first to third single-phase bus rings are respectively mounted, and the axis A neutral point annular groove is provided which opens on the other side in the direction (the side facing the stator) and in which the neutral point bus ring is mounted.

  The first single-phase bus ring is a first annular portion having a first diameter, and extends radially outward from the first annular portion, and in a corresponding first phase (for example, U phase) stator coil And a first connection terminal portion electrically connected to one of the pair of end portions.

  The second single-phase bus ring has a second annular portion having a second diameter smaller than the first diameter, and extends radially outward from the second annular portion, and a corresponding second phase (for example, a V phase). And the second connection terminal portion electrically connected to one of the pair of end portions of the stator coil.

  The third single-phase bus ring has a third annular portion having a third diameter smaller than the second diameter, and extends radially outward from the third annular portion, and a corresponding third phase (for example, a W phase). And a third connection terminal portion electrically connected to one of the pair of end portions of the stator coil.

The first single-phase annular groove has a first diameter so that the first annular portion is mounted.
The second single-phase annular groove has a second diameter so that the second annular portion is mounted, and has a groove depth shallower than the first single-phase annular groove.
The third single-phase annular groove has a third diameter so that the third annular portion is mounted, and has a groove depth shallower than the second single-phase annular groove.

  In the first single-phase bus ring, the first connection terminal portion has a distal end portion outward from the holder in the radial direction in a state where the first annular portion is mounted in the first annular groove. It is formed so as to be located at a predetermined position.

  In the second single-phase bus ring, the second connection terminal portion is displaced from the first connection terminal portion in the circumferential direction in a state where the second annular portion is mounted in the second annular groove. And it forms so that a front-end | tip part may be located in the substantially same position as the front-end | tip part of a said 1st connection terminal part regarding a radial direction.

  In the third single-phase bus ring, the third connection terminal portion includes the first and second connection terminal portions in the circumferential direction in a state where the third annular portion is mounted in the third annular groove. Is formed so that the distal end portion is positioned substantially at the same position as the distal end portions of the first and second connection terminal portions in the radial direction.

  As described above, the conventional bus ring unit is installed by displacing the first to third single-phase bus rings in the axial direction, thereby preventing these bus rings from interfering with each other, While facilitating connection work between the corresponding connection terminal portion and the end portion of the stator coil, the connection terminal portions of the first to third single-phase bus rings are positioned at the same radial position. Therefore, the overall size is reduced in the radial direction.

  However, in the conventional bus ring unit, as described above, the first to third single-phase bus rings are installed in a state of being displaced in the axial direction. Therefore, there is a problem that the axial direction is increased.

  In the conventional bus ring unit, the single-phase bus ring and the neutral-point bus ring are formed by round conductors having a circular cross section, and the dedicated holder is used to stably hold these. Was necessary. The dedicated holder also increases the overall size of the bus ring unit and increases the cost.

  Further, the single-phase bus ring needs to include a power supply terminal portion, and includes the annular portion, the connection terminal portion, and the power supply terminal portion while reducing electric resistance in the power supply terminal portion. It is necessary to reduce the size and cost of the entire structure.

  For example, the following Patent Document 2 discloses a configuration in which a crimp terminal is used as the power supply terminal portion, but a member that forms the annular portion and the connection terminal and a member that forms the power supply terminal portion (crimp contact) Since the terminal is a separate body, the electric resistance at the power supply terminal increases, and the cost increases due to an increase in the number of parts.

  Further, Patent Document 3 below discloses a single-phase bus ring in which a connection terminal portion and a power supply terminal portion are integrally formed. The configuration described in Patent Document 3 includes three conductor wires. Polymerization is performed to form one single-phase bus ring, and the electrical resistance between the conductor wires increases, and there is a problem of high cost due to an increase in the number of parts.

JP 2003-324887 A Japanese Patent No. 5178292 JP 2014-077900 A

The present invention has been made in view of such conventional technology, and is a single-phase bus ring that electrically connects in-phase coils of a plurality of stator coils mounted on a stator, An object of the present invention is to provide an efficient manufacturing method of a single-phase bus ring that can be made compact in both the axial direction and the radial direction.
Further, the present invention is a neutral point bus ring for electrically connecting a plurality of stator coils mounted on a stator, wherein the axial ring and the radial direction of the stator can be made compact. The object is to provide an efficient manufacturing method of the sex point bus ring.

  In order to achieve the above object, the present invention provides a single-phase bus ring that connects one of a pair of end portions of a common-phase coil among a plurality of stator coils wound around a plurality of teeth in a stator. A plurality of arc regions arranged in series in the circumferential direction along the circumferential direction so as to be located on a circle concentric with the central axis of the stator, and opposite edges of adjacent arc regions A plurality of connection regions provided in the same number as the number of the in-phase coils, wherein the arc region is an axial direction with respect to the axial direction and a reference portion located at a first position in the axial direction The first position is located at the displaced second position in the axial direction, and has an edge part that forms an edge of the arc region, and a transition part that connects between the reference part and the edge part, and the connection A pair of zones extending radially outward from the opposing edges of the adjacent arc regions with respect to the central axis of the stator, with the space being formed between the two regions at the second position in the axial direction. And a bridge portion that connects the radially outer ends of the pair of extending pieces, and one end of the stator coil can be inserted into the space. In the manufacturing method of a bus ring, a step of preparing a long conductive rectangular wire whose cross-sectional shape is a rectangular shape defined by a pair of long sides and a pair of short sides, and forming a connecting region for forming the connecting region Performing edgewise bending on the conductive rectangular wire on both sides of the connecting region forming member so that the portion is offset in an edgewise direction with respect to the arc region forming portion forming the arc region; and Conductive rectangular wire The length along the long side is larger than the long side, and the length along the longitudinal direction of the conductive rectangular wire is larger than the thickness of one end of the stator coil. By moving the space forming member relative to the main surface of the connecting region forming portion in the thickness direction of the conductive rectangular wire and performing flat-wise bending on the conductive rectangular wire, the tip side is the bridge portion. Forming the pair of extended pieces in a state of being connected to each other, and causing the long side of the conductive rectangular wire subjected to edgewise bending and flatwise bending to be along the central axis of the stator In the state, the conductive rectangular wire is formed into a circular shape concentric with the stator, and at least the main surface facing the inside of the bridge portion and the pair of extending pieces are adjacent to the bridge portion. Facing inside And a method of manufacturing a single-phase bus ring including an insulating member covering step of covering the conductive rectangular wire with an insulating member in a state where the main surface is masked.

  Preferably, the masking may be performed so as to entirely cover a portion of the bridge portion and the pair of extending pieces adjacent to the bridge portion.

  The single-phase bus ring is provided with a power feeding region, and the power feeding region extends in an axial direction extending from a reference portion of any one of the plurality of arc regions in a direction along a central axis of the stator. A radially extending portion extending radially from the distal end of the axially extending portion with respect to the central axis of the stator, and a central axis of the stator from the distal end of the radially extending portion. A single-phase bus ring manufacturing method is manufactured from the ring forming step when the single-phase bus ring has a folded portion that folds around an axis along the axis and defines an opening facing a direction along the central axis. The power supply region forming step is provided on the upstream side of the process.

In the feeding region forming step, edgewise bending is performed with the axis along the short side as a bending fulcrum with respect to a portion corresponding to a reference portion in any one of the plurality of arc region forming sites. Performing an axially extending part forming region forming the axially extending part, and flatwise bending with the axis along the long side as a bending fulcrum with respect to the axially extending part forming region And forming a radially extending portion forming region constituting the radially extending portion, and edgewise with the axis along the short side as a bending fulcrum with respect to the radially extending portion forming region And bending to form the folded portion.
In this case, the masking is also performed on at least the main surface facing the inside of the folded portion that forms the opening.

  Preferably, the masking may be performed so as to entirely cover the folded portion.

  In order to achieve the above object, the present invention provides one of the coils for electrically connecting in-phase coils among a pair of end portions of a plurality of stator coils respectively wound around a plurality of teeth in a stator. A neutral-point bus ring that electrically connects the other end other than the end, and is disposed along a circumferential direction and with a gap so as to be positioned on a circle concentric with the central axis of the stator. A plurality of arc regions arranged in series in a direction and a connection region that connects opposite edges of adjacent arc regions, and a plurality of connection regions provided in the same number as the number of the plurality of stator coils. The arc region is at least partially located at a first axial position of the stator, and the connection region is formed from an opposing edge of the arc region adjacent to each other with a space formed between them. Based on the central axis A pair of extending pieces extending radially outward and a bridge portion that connects the radially outer ends of the pair of extending pieces, and the other end of the stator coil can be inserted into the space. In the method of manufacturing a neutral point bus ring, a step of preparing a long conductive rectangular wire whose cross-sectional shape is a rectangular shape defined by a pair of long sides and a pair of short sides; The length in the direction along the long side of the conductive rectangular wire is larger than the long side, and the length in the longitudinal direction of the conductive rectangular wire is based on the thickness of the other end of the stator coil. A space forming member having a large size is moved relative to a main surface of a connection region forming portion forming the connection region in a thickness direction of the conductive rectangular wire, and the connection region of the conductive rectangular wire is moved. Flatwise bend the connection area formation site to be formed Thus, the step of forming the pair of extending pieces in a state in which the tip side is connected via the bridge portion, and the long side of the conductive rectangular wire subjected to flat-wise bending is set to the center of the stator. A ring forming step of forming the conductive rectangular wire into a circular shape concentric with the stator in a state along the axis, and at least the main surface facing the inside of the bridge portion and the pair of extending pieces Provided is a neutral point bus ring manufacturing method including an insulating member covering step of covering the conductive rectangular wire with an insulating member in a state where a main surface facing the inside of a portion adjacent to the bridge portion is masked. .

  Preferably, the masking may be performed so as to entirely cover a portion of the bridge portion and the pair of extending pieces adjacent to the bridge portion.

  According to the manufacturing method of the single-phase bus ring and the neutral point bus ring according to the present invention, it is possible to efficiently manufacture a bus ring that can be made compact in both the axial direction and the radial direction of the stator. .

FIG. 1 is a perspective view of a bus ring unit including first to third single-phase bus rings and a neutral point bus ring manufactured by a manufacturing method according to an embodiment of the present invention. FIG. 2 is a plan view of the bus ring unit. FIG. 3 is a front view of the bus ring unit. FIG. 4 is a perspective view of the neutral point bus ring. FIGS. 5A and 5B are schematic views of a process of connecting the neutral point side end portion of the stator coil to the neutral point side connection region in the neutral point bus ring. FIG. 6 is a perspective view of the first single-phase bus ring. FIG. 7 is a perspective view of the second single-phase bus ring. FIG. 8 is a perspective view of the third single-phase bus ring. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 10A to 10C are schematic manufacturing process diagrams of the neutral point bus ring. 11A to 11E are schematic manufacturing process diagrams of the single-phase bus ring. FIG. 12 is a schematic cross-sectional view of a rotary motor.

  Hereinafter, an embodiment of a method for producing a single-phase bus ring and a neutral point bus ring according to the present invention will be described with reference to the accompanying drawings.

  First, a perspective view, a plan view, and a front view of a bus ring unit 1 including a single-phase bus ring and a neutral point bus ring 50 manufactured by the manufacturing method according to the present embodiment are shown.

  The bus ring unit 1 is electrically connected to end portions of a plurality of stator coils (not shown) mounted on a stator (not shown), and receives electric power supplied from the outside. It is a member for transmitting to the coil.

  Specifically, the stator has a plurality of teeth (not shown) arranged with a gap along the circumferential direction, and the plurality of stator coils are wound around the plurality of teeth. In the state, the pair of end portions are pulled out to one side in the axial direction of the stator.

  As shown in FIGS. 1 to 3, the bus ring unit 1 electrically connects one of the pair of end portions (hereinafter referred to as single-phase side end portions) of the in-phase coil of the plurality of stator coils. A single-phase bus ring to be connected to the other of the pair of end portions of the plurality of stator coils (hereinafter referred to as a neutral point side end portion 90 (see FIG. 5 below)) The sex point bus ring 50 is provided.

  In the bus ring unit 1, as shown in FIGS. 1 to 3, the single-phase bus ring includes first to third single-phase bus rings 10, 20, and 30.

  The first single-phase bus ring 10 electrically connects the single-phase side ends of the stator coil of any of the U phase, V phase, and W phase (for example, U phase), The second and third single-phase bus rings 20 and 30 are one of the remaining phases other than the phases connected by the first single-phase bus ring 10 among the U-phase, V-phase, and W-phase (for example, the V-phase). ) And the single-phase side ends of the other (for example, W phase) stator coil are electrically connected to each other.

FIG. 4 is a perspective view of the neutral point bus ring 50.
As shown in FIGS. 1 to 4, the neutral point bus ring 50 includes a plurality of neutral point side arc regions 51 and a plurality of neutral point side connection regions 55.

  The plurality of neutral point side arc regions 51 are arranged along the circumferential direction so as to be positioned on a reference circle coaxial with the stator, and are arranged in series in the circumferential direction with a gap therebetween.

Regarding the position along the axial direction of the stator, the neutral point side arc region 51 is configured such that at least a part thereof is positioned at the first position in the axial direction.
In the present embodiment, as shown in FIGS. 1 to 4, the entire neutral point side arc region 51 is located at the first axial position.

  The neutral point side connection region 55 connects the opposing edges of the adjacent neutral point side arc regions 51 to each other, and the neutral point side end portions 90 of the plurality of stator coils (see FIG. 5 below). Is inserted and acts as a neutral point connection terminal electrically and mechanically coupled.

  Specifically, as shown in FIGS. 1 to 4, the neutral point side connection region 55 has a central axis of the stator in a state where a space 57 is formed between opposing edges of adjacent arc regions. A pair of extending pieces 56a extending outward in the radial direction with respect to a reference, and a bridge portion 56b for connecting the radially outer ends of the pair of extending pieces 56a are provided.

As described above, in the present embodiment, the neutral point side arc region 51 is entirely located at the first position in the axial direction, including the facing edge.
The pair of neutral point side extending pieces 56a and the bridge portion 56b are also located at the first position in the axial direction.

FIGS. 5A and 5B are schematic views showing a process of connecting the neutral point side end portion 90 of the stator coil to the neutral point side connection region 55.
As shown in FIG. 5 (a), the space 57 between the pair of neutral point side extending pieces 56a has a width that allows the neutral point side end portion 90 to be inserted.

That is, by narrowing the pair of neutral point side extending pieces 56a with the pair of pressing members 99 in a state where the neutral point side end portion 90 is inserted into the space 57 (FIG. 5A), The neutral point side end portion 90 is electrically and mechanically connected to the neutral point side connection region 55 (FIG. 5B).
In addition to the inner surface of the portion adjacent to the bridge portion of the bridge portion 56b and the pair of extending pieces 56a (the portion in contact with the neutral point side end), the outer surface is also in a conductive state. Preferably, the neutral point side end portion 90 is electrically and mechanically connected to the neutral point side connection region 55 by fusing using a pair of electrodes as the pair of pressing members 99. it can.

  In the present embodiment, as shown in FIG. 4 and the like, the pair of neutral point side extending pieces 56a is inserted through the neutral point side end portion 90 in the entire region from the proximal end side to the distal end side. The space 57 having a width to be obtained is provided.

  According to such a configuration, the neutral point bus ring 50 is connected to the stator with respect to the neutral point side end portion 90 in a state where the neutral point side end portion 90 is positioned in the space 57. In addition to the relative movement in the axial direction, the neutral point bus ring 50 is moved relative to the neutral point side end portion 90 in the radial direction with respect to the central axis of the stator. Can also appear.

  The bus ring unit 1 according to the present embodiment is configured to electrically connect twelve stator coils. Therefore, the neutral point bus ring 50 includes the twelve stator rings. It has a neutral point side connection region 55.

Next, the single-phase bus rings 10, 20, and 30 will be described.
FIGS. 6 to 8 show perspective views of the first to third single-phase bus rings 10, 20, and 30, respectively.
FIG. 9 is a sectional view taken along line IX-IX in FIG.
As shown in FIGS. 1 to 3 and 6, the first single-phase bus ring 10 includes a plurality of first single-phase arc regions 11 and a plurality of first single-phase connection regions 15. .

  The plurality of first single-phase-side arc regions 11 are along the circumferential direction so as to be coaxial with the stator and on the first circle having a smaller diameter than the reference circle, and in the circumferential direction with a gap interposed therebetween. They are arranged in series.

  The first single-phase side arc region 11 has an axial second direction in which a circumferential edge is displaced from the neutral point side connection region 55 in the circumferential direction and is displaced from the first axial direction position in the axial direction position. It is formed to be positioned.

  Specifically, as shown in FIG. 6 and the like, the first single-phase side arc region 11 includes a first single-phase side reference portion 12 located at the first position in the axial direction and an axial first position with respect to the axial direction. A first single-phase side edge portion 13 that forms a circumferential edge of the first single-phase side arc region 11 and is positioned at the displaced second axial position, the first single-phase side reference portion 12, and the first And a first single-phase side transition region 14 that connects between the single-phase side edge regions 13.

  The first single-phase side arc region 11 is formed such that the single-phase side edge portion 13 is displaced from the neutral point side connection region 55 in the circumferential direction.

  In the present embodiment, as shown in FIG. 6 and the like, the first single-phase side transition region 14 extends from the circumferential end of the first single-phase side reference region 12 to the first single-phase side edge region 13. It is inclined so as to be located from the first axial position to the second axial position as it goes toward.

In the present embodiment, as shown in FIG. 6, the first single-phase side reference portion 12 exists over a predetermined distance in the circumferential direction, but the present invention is limited to such a form. is not.
For example, the first single-phase side reference portion 12 may be configured to exist only at one point in the circumferential direction.

  The first single-phase side connection region 15 connects opposing edges of one adjacent first single-phase side arc region 11 and the other first single-phase side arc region 11, and includes the plurality of stator coils. It is comprised so that it may act as a 1st phase connection terminal to which the single phase side edge part of the stator coil of one phase (for example, U phase) is connected.

  Specifically, as shown in FIG. 1 to FIG. 3 and FIG. 6, the first single-phase side connection region 15 includes one of the first single-phase side arc region 11 and another of the first single-phase side arc region 11. A pair of first single-phase extending pieces 16a extending radially outward from the opposing edges, and a first single-phase connecting the radially outer ends of the pair of first single-phase extending pieces 16a. Side bridge portion 16b.

  As described above, the circumferential edge of the first single-phase-side arc region 11 is displaced from the neutral point-side connection region 55 in the circumferential direction and is positioned at the second axial position in the axial direction.

  The pair of first single-phase extending pieces 16a extending radially outward from the opposing edges are positioned at the second axial position and have a space 17 therebetween, and the neutral point The side arc region 51 extends radially outward beyond the portion located at the first axial position, and is connected to each other via the first single-phase side bridge portion 16b at the tip. Yes.

The space 17 between the pair of first single-phase extending pieces 16a has a width that allows insertion of the corresponding single-phase end.
That is, in the same manner as in the neutral point side connection region 55, the pair of first single phase side extending pieces 16 a is paired with a pair of clamping pressures with the corresponding single phase side end portions inserted into the space 17. The single-phase side end is electrically and mechanically connected to the first single-phase side connection region 15 by narrowing the pressure with a member.
In addition to the inner surface of the portion adjacent to the bridge portion 16b of the bridge portion 16b and the pair of extending pieces 16a (portion in contact with the single-phase side end portion), the outer surface is also in a conductive state. Preferably, a pair of electrodes is used as the pair of pinching members 99, and the single-phase side ends can be electrically and mechanically connected to the first single-phase side connection region 15 by fusing. .

  In the present embodiment, as shown in FIG. 2 and the like, the space 17 between the pair of first single-phase side extending pieces 16a has the single-phase side end in the entire region from the proximal end side to the distal end side. The portion has a width that can be inserted.

  According to such a configuration, the first single-phase bus ring 10 is placed in the axial direction of the stator with respect to the single-phase side end when the single-phase side end is positioned in the space 17. The first single-phase bus ring 10 is caused not only to move relative to the single-phase side end but also to move relative to the single-phase side end portion in the radial direction with respect to the central axis of the stator. be able to.

  As shown in FIGS. 1 to 3 and 7, the second single-phase bus ring 20 has a plurality of second single-phase side arc regions 21 and a plurality of second single-phase side connection regions 25. .

  The plurality of second single-phase-side arc regions 21 are along the circumferential direction so as to be positioned coaxially with the stator and on a second circle having a smaller diameter than the first circle, with the gap interposed therebetween. Are arranged in series.

  The second single-phase side arc region 21 is displaced from the neutral point side connection region 55 and the first single-phase side arc region 15 in the circumferential direction with respect to the circumferential direction, and the second axial direction position in the axial direction. It is formed to be positioned.

  Specifically, as shown in FIG. 7 and the like, the second single-phase side arc region 21 includes a second single-phase side reference region 22 located at the first position in the axial direction and a circumference of the second single-phase side arc region. A second single-phase side edge part 23 that forms a directional edge, and a second single-phase side transition part 24 that connects the second single-phase side reference part 22 and the second single-phase side edge part 23. doing.

  In the second single-phase side arc region 21, the second single-phase side edge region 23 is displaced with respect to the circumferential direction, the neutral point-side connection region 55 and the first single-phase side connection region 15 are displaced, and the axial direction. The first position in the axial direction is formed so as to be positioned in the second position in the displaced axial direction.

  In the present embodiment, as shown in FIG. 7, the second single-phase side transition region 24 extends from the circumferential end of the second single-phase side reference region 22 to the second single-phase side edge region 23. As it goes, it is inclined so as to be positioned from the first axial position to the second axial position.

In the present embodiment, as shown in FIG. 7, the second single-phase side reference portion 22 exists over a predetermined distance in the circumferential direction, but the present invention is limited to such a form. is not.
For example, the second single-phase side reference region 22 may be configured to exist only at one point in the circumferential direction.

  The second single-phase side connection region 25 connects opposing edges of one adjacent second single-phase side arc region 21 and the other second single-phase side arc region 21, and includes the plurality of stator coils. It is comprised so that it may act as the connection terminal for 2nd phases to which the single phase side edge part of the stator coil of another phase (for example, V phase) is connected.

  Specifically, as shown in FIG. 1 to FIG. 3 and FIG. 7, the second single-phase side connection region 25 includes one second single-phase side arc region 21 and another second single-phase side arc region 21. A pair of second single-phase-side extending pieces 26a each extending radially outward from the opposing edges of the pair, and a second single-phase connecting the radially outer ends of the pair of second single-phase-side extending pieces 26a. Side bridge portion 26b.

  As described above, the circumferential edge of the second single-phase side arc region 21 is displaced from the neutral point side connection region 55 and the first single-phase side connection region 15 in the circumferential direction and is axial in the axial direction. Located in the second position.

  The pair of second single-phase-side extending pieces 26a are positioned at the second position in the axial direction and have a space 27 therebetween, and the neutral-point-side arc region 51 and the first single-phase The side arc region 11 extends radially outward beyond a portion located at the first position in the axial direction, and is connected to each other via the second single-phase side bridge portion 26b at the tip. Yes.

The space 27 between the pair of second single-phase side extending pieces 26a has a width that allows insertion of a corresponding single-phase side end.
That is, in the same manner as in the neutral point side connection region 55 and the first single phase side connection region 15, the pair of second single phases are inserted with the corresponding single phase side end portions inserted into the space 27. The single-phase side end is electrically and mechanically connected to the second single-phase side connection region 25 by narrowing the side extending piece 26a with a pair of clamping members.
In addition to the inner surface of the portion adjacent to the bridge portion 26b of the bridge portion 26b and the pair of extending pieces 26a (portion in contact with the single-phase side end portion), the outer surface is also in a conductive state. Preferably, a pair of electrodes is used as the pair of pinching members 99, and the single-phase side end portion can be electrically and mechanically connected to the second single-phase side connection region 25 by fusing. .

  In the present embodiment, as shown in FIG. 2 and the like, the space 27 between the pair of second single-phase side extending pieces 26a has the single-phase side end in the entire region from the proximal end side to the distal end side. The portion has a width that can be inserted.

  According to such a configuration, the second single-phase bus ring 20 is placed in the axial direction of the stator with respect to the single-phase side end when the single-phase side end is positioned in the space 27. The second single-phase bus ring 20 is caused not only to move relative to the single-phase side end but also to move relative to the single-phase side end portion in the radial direction with respect to the central axis of the stator. be able to.

  As shown in FIGS. 1 to 3 and 8, the third single-phase bus ring 30 includes a plurality of third single-phase arc regions 31 and a plurality of third single-phase connection regions 35. .

  The plurality of third single-phase-side arc regions 31 are along the circumferential direction so as to be coaxial with the stator and on a third circle having a smaller diameter than the second circle, with the gap interposed therebetween. Are arranged in series.

  The third single-phase side arc region 31 is displaced from the neutral point side connection region 55, the first single-phase side arc region 15 and the second single-phase side connection region 25 with respect to the circumferential direction in the circumferential edge. And it is formed so as to be located at the second axial position with respect to the axial position.

  Specifically, as shown in FIG. 8 and the like, the third single-phase side arc region 31 includes a third single-phase side reference region 32 located at the first position in the axial direction, and the third single-phase side arc region 31. A third single-phase side edge part 33 forming a circumferential edge, and a third single-phase side transition part 34 connecting between the third single-phase side reference part 32 and the third single-phase side edge part 33; Have.

  The third single-phase side arc region 31 has the third single-phase side edge region 33 in the circumferential direction, the neutral point side connection region 55, the first single-phase side connection region 15, and the second single-phase side connection region. The region 25 is displaced and is formed so as to be located at the displaced second axial position with respect to the first axial position with respect to the axial direction.

  In the present embodiment, as shown in FIG. 8, the third single-phase side transition region 34 extends from the circumferential end of the third single-phase side reference region 32 to the third single-phase side edge region 33. As it goes, it is inclined so as to be positioned from the first axial position to the second axial position.

In the present embodiment, as shown in FIG. 8, the third single-phase side reference portion 32 exists over a predetermined distance in the circumferential direction, but the present invention is limited to such a form. is not.
For example, the third single-phase side reference portion 32 may be configured to exist only at one point in the circumferential direction.

Said third single-phase side connecting region 35 connecting the pair Koe Tsu di of the third single-phase side arc region 31 and the other third single-phase side arc region 31 one adjacent the plurality of stator It is comprised so that it may act as a connection terminal for 3rd phases to which the single phase side edge part of the stator coil of the other phase (for example, W phase) of coils is connected.

  Specifically, as shown in FIGS. 1 to 3 and 8, the third single-phase side connection region 35 includes one third single-phase side arc region 31 and another third single-phase side arc region 31. A pair of third single-phase-side extending pieces 36a extending radially outward from the opposite edges of the pair, and a third single-phase connecting the radially outer ends of the pair of third single-phase-side extending pieces 36a. Side bridge portion 36b.

  As described above, the circumferential edge of the third single-phase-side arc region 31 has the neutral point-side connection region 55, the first single-phase-side connection region 15, and the second single-phase-side connection region 25 in the circumferential direction. Is displaced and is positioned at the second axial position with respect to the axial direction.

  The pair of third single-phase-side extending pieces 36a are positioned at the second position in the axial direction and have a space 37 therebetween, and the neutral point-side arc region 51, the first single-phase The third arc-side bridge portion extends radially outward beyond a portion located at the first position in the axial direction in the side arc region 11 and the second single-phase side arc region 21, and at the tip portion They are connected to each other via 36b.

The space 37 between the pair of third single-phase side extending pieces 36a has a width that allows insertion of a corresponding single-phase side end.
That is, in the same manner as in the neutral point side connection region 55, the first single phase side connection region, and the second single phase side connection region, the corresponding single phase side end portion is inserted into the space 37. The pair of third single-phase side extending pieces 36a are narrowed by a pair of clamping members, so that the single-phase side ends are electrically and mechanically connected to the third single-phase side connection region 35. The
In addition to the inner surface (the portion in contact with the single-phase side end portion) of the bridge portion 36b and the pair of extending pieces 36a adjacent to the bridge portion 36b, the outer surface is also in a conductive state. Preferably, a pair of electrodes is used as the pair of clamping members 99, and the single-phase side end portion can be electrically and mechanically connected to the third single-phase side connection region 35 by fusing. .

  In the present embodiment, as shown in FIG. 2 and the like, the space 37 between the pair of third single-phase side extending pieces 36a has the single-phase side end in the entire region from the proximal end side to the distal end side. The portion has a width that can be inserted.

  According to such a configuration, the third single-phase bus ring 30 is placed in the axial direction of the stator with respect to the single-phase side end when the single-phase side end is positioned in the space 37. The third single-phase bus ring 30 is caused not only to move relative to the single-phase side end but also to move relative to the single-phase side end portion in the radial direction with respect to the central axis of the stator. be able to.

  Thus, in the said bus ring unit 1 which concerns on this Embodiment, the said neutral point side circular arc area | region 51 is arrange | positioned on a reference | standard circle in the state in which at least one part was located in the axial direction 1st position. The neutral point side connection region 55 that connects the opposing edges of the adjacent neutral point side arc regions 51 is adjacent to the one neutral point side arc region 51 and the other neutral point side arc region 51. Of the pair of neutral point side extending pieces 56a extending outward in the radial direction with a space 17 between each other from the opposing edges, and the ends of the pair of neutral point side extending pieces 56a And the neutral point side bridge portion 56b for connecting the two.

  On the other hand, the single-phase arc regions 11, 21, 31 are arranged on a circle having a smaller diameter than the reference circle in a state where at least a part thereof is positioned at the first position in the axial direction, and the circumferential edge is related to the circumferential direction. The neutral point side connection region 55 is displaced and is formed so as to be positioned at the displaced second axial position with respect to the first axial position in the axial direction.

  And the single phase side connection area | region 15, 25, 35 which connects the opposing edge of adjacent single phase side circular arc area | regions 11, 21, and 31 is located in the 2nd position of an axial direction, and the said space 17, 27 between each other. , 37, and extending radially outward from opposing edges of one adjacent single-phase arc region 11, 21, 31 and the other single-phase arc region 11, 21, 31, respectively. The pair of single-phase side extending pieces 16a, 26a, 36a extending radially outward beyond the portion located at the first axial position in the neutral point side arc region 51, and the pair of single-phase It has said single phase side bridge | bridging part 16b, 26b, 36b which connects the front-end | tip parts of the side extension pieces 16a, 26a, 36a.

  According to such a configuration, the single-phase bus rings 10, 20, 30 and the neutral-point bus ring 50 are prevented from interfering with each other, and the single-phase bus rings 10, 20, 30, and The bus ring unit 1 including the neutral point bus ring 50 can be made compact as a whole, particularly in the axial direction.

Further, the pair of neutral point side extending pieces 56a and the pair of single phase side extending pieces 16a, 26a, 36a acting as connection terminals with the end portions of the stator coils are displaced with respect to each other in the circumferential direction. In this state, the tip portion extends outward from the reference circle in the radial direction.
Therefore, it is possible to facilitate the connection work of the stator coil to the single-phase bus rings 10, 20, 30 and the neutral point bus ring 50.

  In the present embodiment, as shown in FIG. 1 and the like, the position displaced by a predetermined distance from the first axial position in the direction away from the stator coil is set as the second axial position. The position displaced from the first axial direction position by a predetermined distance in the direction approaching the fixed coil can be set as the second axial position.

  Further, as shown in FIG. 1 and the like, in the bus ring unit 1 according to the present embodiment, the single-phase bus rings 10, 20, 30 are the single-phase side arc regions 11, 21, 31. In addition to the single-phase side connection regions 15, 25, and 35, power supply regions 110, 120, and 130 are included.

  That is, the first to third single-phase bus rings 10, 20, and 30 integrally include first to third single-phase power feeding regions 110, 120, and 130, respectively.

  As shown in FIGS. 6 to 9, each of the first to third single-phase side feeding regions 110, 120, and 130 is a single-phase side arc in the plurality of single-phase side arc regions 11, 21, and 31. Axially extending portions 111, 121, 131 extending from the single phase side reference portions 12, 22, 32 of the region in the direction along the central axis of the stator, and tips of the axially extending portions 111, 121, 131 The radial extending portions 112, 122, 132 extending in the radial direction with reference to the central axis of the stator, and the distal ends of the radial extending portions 112, 122, 132 along the central axis of the stator Folded portions 113, 123, and 133 that are folded around an axis and define openings 151, 152, and 153 that face in the direction along the central axis, and the openings 151, 152, and 153 function as power supply terminals. Do It has become the jar.

  In the present embodiment, as shown in FIG. 1 and FIG. 9 and the like, the axially extending portions 111, 121, 131 are the single-phase side reference portions 12, 22, 32 with respect to the axial direction. Positioned on the same side as the phase-side connecting regions 15, 25, and 35, the radially extending portions 112, 122, and 132 are radially inward from the tips of the axially extending portions 111, 121, and 131. Has been extended.

Instead of such a configuration, the axially extending portions 111, 121, 131 are referred to as the single-phase side connection regions 15, 25, 35 with respect to the single-phase side reference portions 12, 22, 32 in the axial direction. It can also be located on the opposite side.
Further, the radially extending portions 112, 122, 132 can be extended radially outward from the tips of the axially extending portions 111, 121, 131.

  For example, the power supply regions 110, 120, and 130 are provided on the same side as the single-phase side connection regions 15, 25, and 35 with respect to the single-phase side reference portions 12, 22, and 32 in the axial direction, and the power supply In the configuration in which the radially extending portions 112, 122, 132 of the regions 110, 120, 130 extend radially outward from the axially extending portions 111, 121, 131, the first to third units The phase-side power feeding regions 110, 120, and 130 are formed so as to be displaced with respect to the first to third single-phase side connection regions 15, 25, and 35 in the circumferential direction while being displaced with respect to each other in the circumferential direction. The

Here, a method for manufacturing the neutral point bus ring 50 will be described.
FIG. 10 shows a schematic flow diagram of a method for manufacturing the neutral point bus ring 50.

In the present embodiment, the neutral point bus ring 50 has a long conductive shape whose cross-sectional shape is a rectangular shape defined by a pair of long sides 81 and a pair of short sides 82 (see FIG. 9). It is formed using a flat wire 80.
In the conductive rectangular wire 80, the length of the short side 82 is the plate thickness t (see FIG. 10 (a)), and the length of the long side is the plate width w (see FIG. 11 (a) below). Become.

  In the method of manufacturing the neutral point bus ring 50, the length of the conductive rectangular wire 80 in the direction along the long side 81 is larger than the long side 81 and the longitudinal direction of the conductive rectangular wire 80 is set. The space forming member 180 having a length L along the length of the neutral point side end portion of the stator coil is set to a main surface of the connection region forming portion 55A that forms the connection region 55. By making relative movement in the thickness direction of the conductive rectangular wire 80 and performing flat-wise bending at the connection region forming portion 55A in the conductive rectangular wire 80 (FIG. 10A), the distal end side is the bridge portion 56b. A step (FIG. 10B) of forming the pair of extending pieces 56a in a state of being connected via each other.

  The manufacturing method of the neutral point bus ring 50 further includes the conductive rectangular in a state in which the long side 81 of the conductive rectangular wire 80 subjected to flatwise bending is aligned with the central axis of the stator. A ring forming step (FIG. 10 (c)) for forming the wire 80 into a circular shape concentric with the stator is provided.

  Due to the ring forming step, the shape shown in FIG. 4, that is, the neutral point side arc region 51 is located on a circle concentric with the central axis of the stator, and the pair of neutral point side extending pieces 56 a. Extend radially outward from the neutral point-side arc region 51 while leaving a space 57 between them, and the ends of the pair of neutral point-side extending pieces 56a are formed by the bridge portion 56b. A connected shape is formed.

  The method for manufacturing the neutral point bus ring 50 then includes at least a main surface facing the inside of the bridge portion 56b and a main portion facing the inside of the portion adjacent to the bridge portion 56b of the pair of extending pieces 56a. An insulating member covering step of covering the conductive rectangular wire 80 with an insulating member in a state where the surface is masked is provided.

  As described above, after the ring forming step, the bridge portion 56b and the pair of neutral point side extending pieces 56a extend radially outward from the neutral point side arc region 51, Therefore, the main surface facing the inner side of the bridge portion 56b and the conductive rectangular wire 80 in a state where the main surface facing the inner side of the portion adjacent to the bridge portion 56b of the pair of extending pieces 56a is masked. The insulating member can be efficiently coated.

  Further, since the pair of neutral point side extending pieces 56a is formed by performing a flat bending process on the conductive rectangular wire 80 using the space forming member 180, the pair of neutral points is formed. The space 57 between the side extending pieces 56a can be surely set to a width in which the neutral point side end of the stator coil can be inserted.

  From the viewpoint of good electrical connection between the neutral point side end portion of the stator coil and the neutral point side connection region 55, preferably, the masking is performed by the bridge portion 56b and the pair of extending pieces 56a. Among these, it can be comprised so that the whole part adjacent to the said bridge | bridging part 56b may be covered.

  The masking can be performed by various methods. For example, a method of covering the relevant part with a cap such as silicon or a method of winding a masking tape around the relevant part is preferably used.

Next, a method for manufacturing the single-phase bus rings 10, 20, and 30 will be described.
FIG. 11 shows a schematic flow diagram of a method for manufacturing the single-phase bus rings 10, 20, 30.

  Similarly to the neutral point bus ring 50, the single-phase bus rings 10, 20, and 30 have a rectangular shape with a cross-sectional shape defined by a pair of long sides 81 and a pair of short sides 82. The conductive rectangular wire 80 is used.

  In the method of manufacturing the single-phase bus rings 10, 20, 30, the single-phase side connection region forming portions 15 A, 25 A, 35 A forming the single-phase side connection regions 15, 25, 35 are the single-phase side arc region 11. , 21 and 31 are formed on both sides of the single-phase side connecting region forming members 15A, 25A and 35A so as to be offset in an edgewise direction with respect to the single-phase side arc region forming portions 11A, 21A and 31A. A step of performing edgewise bending on the characteristic rectangular wire 80 (FIGS. 11A and 11B).

  In the method of manufacturing the single-phase bus rings 10, 20, 30, the length of the conductive rectangular wire 80 in the direction along the long side 81 is larger than the long side 81 after the edgewise bending step. And a space-forming member 180 in which the length L along the longitudinal direction of the conductive rectangular wire 80 is larger than the thickness of the single-phase end of the stator coil. By making relative movement in the thickness direction of the conductive rectangular wire 80 with respect to the main surfaces of 15A, 25A, and 35A, and performing flat-wise bending on the conductive rectangular wire 80 (FIG. 11 (c)), A step of forming the pair of extending pieces 16a, 26a, 36a in a state where the distal ends are connected via the bridge portions 16b, 26b, 36b (see FIG. 11D).

  In the method of manufacturing the single-phase bus rings 10, 20, and 30, the long side 81 of the conductive rectangular wire 80 after the edgewise bending and flatwise bending is performed along the central axis of the stator. In this state, there is a ring forming step (FIG. 11 (e)) for forming the conductive rectangular wire 80 into a circular shape concentric with the stator.

  6 to 8, that is, the single-phase side reference portions 12, 22, and 32 are positioned at the first position in the axial direction and the single-phase side edge portions 13, 23, and 33 are axial lines. The single-phase side arc regions 11, 21, 31 are positioned on a circle concentric with the central axis of the stator in a state where the pair of single-phase side extending pieces 16a, 26a, 36a extends radially outward from the single-phase side arc regions 11, 21, 31 with spaces 17, 27, 37 between each other, and the pair of single-phase side extended pieces 16a, 26a, 36a A shape is formed in which the distal ends of the two are connected by the bridge portions 16b, 26b, and 36b.

  The manufacturing method of the single-phase bus ring 10, 20, 30 is, after that, at least the main surface facing the inside of the bridge portions 16b, 26b, 36b and the bridge of the pair of extending pieces 16a, 26a, 36a. An insulating member covering step of covering the conductive rectangular wire 80 with an insulating member in a state where the main surface facing the inside of the portion adjacent to the portions 16b, 26b, and 36b is masked is provided.

  As described above, after the ring forming step, the single-phase side bridge portions 16b, 26b, 36b and the pair of single-phase side extending pieces 16a, 26a, 36a are connected to the single-phase side arc regions 11, 21, 31 extends radially outward, and therefore, the main surface facing the inside of the bridge portions 16b, 26b, 36b and the bridge portions 16b, 26b of the pair of extended pieces 16a, 26a, 36a, It is possible to efficiently cover the conductive rectangular wire 80 with the insulating member in a state where the main surface facing the inside of the portion adjacent to 36b is masked.

Further, the pair of single-phase side extending pieces 16a by performing flatwise bending with respect to the conductive flat wire 80 by using the space forming member 180, 26a, since the form 36a, the pair The spaces 17, 27, 37 between the single-phase-side extending pieces 16a, 26a, 36a can be made to have a width that allows the single-phase-side end of the stator coil to be inserted.

  From the viewpoint of a good electrical connection between the single-phase side end of the stator coil and the single-phase side connection regions 15, 25, and 35, the masking is preferably performed by the bridge portions 16 b, 26 b, 36 b, and the Of the pair of extending pieces 16a, 26a, and 36a, the entire portion adjacent to the bridge portions 16b, 26b, and 36b may be covered.

  The masking can be performed by various methods. For example, a method of covering the relevant part with a cap such as silicon or a method of winding a masking tape around the relevant part is preferably used.

  As described above, the power feeding regions 110, 120, and 130 are provided in the single-phase bus rings 10, 20, and 30, and the power feeding regions 110, 120, and 130 are located upstream of the ring forming process in the manufacturing process. It is formed.

  That is, the method for manufacturing the single-phase bus rings 10, 20, 30 includes a power feeding region forming process upstream of the ring forming process.

  In the power feeding region forming step, the single-phase side reference portions 12, 22 in any one of the plurality of arc-region forming portions that form the plurality of single-phase-side arc regions 11, 21, 31, 32, edgewise bending is performed using the axis along the short side 82 as a bending fulcrum for the portion corresponding to 32 to form the axially extending portion forming region constituting the axially extending portions 111, 121, 131. And a radial direction that configures the radially extending portions 112, 122, and 132 by performing flatwise bending with respect to the axially extending portion forming region using the axis along the long side 81 as a bending fulcrum. A step of forming an extended portion forming region, and edgewise bending of the radially extending portion forming region with an axis along the short side 82 as a bending fulcrum, so that the folded portions 113 and 12 are formed. , And forming a 133.

In this case, the masking is performed also on the main surface facing the inside of the folded portions 113, 123, 133 forming at least the openings 151, 152, 153.
From the viewpoint of a good electrical connection between a power source and the power supply regions 110, 120, and 130, preferably, the masking may be configured to cover the entire folded portions 113, 123, and 133.

1 Bus ring units 10, 20, 30 Single-phase bus rings 11, 21, 31 Single-phase side arc regions 12, 22, 32 Single-phase side reference parts 13, 23, 33 Single-phase side edge parts 14, 24, 34 Single Phase side transition part 15, 25, 35 Single phase side connection region 16a, 26a, 36a Single phase side extension piece 16b, 26b, 36b Edge part 17, 27, 37 Space 50 Neutral point bus ring 51 Neutral point side Arc region 55 Neutral point side connecting region 56a Neutral point side extending piece 56b Bridge portion 57 Space 80 Conductive rectangular wire 81 Long side 82 Short side 110, 120, 130 Feeding region 111, 121, 131 Axial direction extending portion 112, 122, 132 Radially extending portion 113, 123, 133 Folded portion 151, 152, 153 Feed terminal opening 180 Space forming member

Claims (6)

A single-phase bus ring that connects one of a pair of end portions of a common-phase coil of a plurality of stator coils wound around a plurality of teeth in a stator, and is concentric with the central axis of the stator A plurality of arc regions arranged in series in the circumferential direction along a circumferential direction so as to be positioned on a circle, and a connecting region that connects opposing edges of adjacent arc regions, the in-phase A plurality of connecting regions provided in the same number as the number of coils, and the arc region includes a reference portion located at a first position in the axial direction and a second axial direction displaced from the first axial direction with respect to the axial direction. And an edge portion that forms an edge of the arc region, and a transition portion that connects between the reference portion and the edge portion, and the connection region is located at a second position in the axial direction. A pair of extending pieces and a pair of extending pieces extending radially outward from the opposing edges of the adjacent arc regions with reference to the central axis of the stator in a state where a space is formed between them. In the manufacturing method of the single-phase bus ring, having a bridge portion that connects the outer ends in the radial direction, and one end of the stator coil can be inserted into the space,
Preparing a long conductive rectangular wire whose cross-sectional shape is a rectangular shape defined by a pair of long sides and a pair of short sides;
The connection region forming part forming the connection region is offset in the edgewise direction with respect to the arc region forming part forming the arc region with respect to the conductive rectangular wire on both sides of the connection region forming member. A process of edgewise bending;
The length of the conductive rectangular wire in the direction along the long side is larger than the long side, and the length along the longitudinal direction of the conductive rectangular wire is the thickness of one end of the stator coil. By moving the space forming member, which is made larger, relative to the main surface of the connection region forming portion in the thickness direction of the conductive rectangular wire, flatwise bending is performed on the conductive rectangular wire. Forming the pair of extending pieces in a state in which the tip side is connected via the bridge portion;
The conductive rectangular wire is formed in a circular shape concentric with the stator in a state where the long side of the conductive rectangular wire subjected to edgewise bending and flatwise bending is along the central axis of the stator. Ring molding process;
The conductive rectangular wire is covered with an insulating member in a state in which at least a main surface facing the inside of the bridge portion and a main surface facing the inside of a portion adjacent to the bridge portion of the pair of extending pieces are masked. A method for manufacturing a single-phase bus ring, comprising: an insulating member covering step.   The said masking is performed so that the part adjacent to the said bridge | bridging part among the said bridge | bridging part and a pair of extended piece may be covered entirely, The manufacturing of the single-phase bus ring of Claim 1 characterized by the above-mentioned. Method. The single-phase bus ring is provided with a power supply region,
The power feeding region includes an axially extending portion extending in a direction along a central axis of the stator from a reference portion of any one of the plurality of arc regions, and a tip of the axially extending portion. A radially extending portion extending in the radial direction with respect to the central axis of the stator, and a fold around an axis line along the central axis of the stator from the tip of the radially extending portion, along the central axis A folded portion that defines an opening facing in a direction,
The method for manufacturing the single-phase bus ring has a power feeding region forming step on the upstream side of the manufacturing step from the ring forming step,
In the feeding region forming step, edgewise bending is performed with the axis along the short side as a bending fulcrum with respect to a portion corresponding to a reference portion in any one of the plurality of arc region forming sites. Performing an axially extending part forming region forming the axially extending part, and flatwise bending with the axis along the long side as a bending fulcrum with respect to the axially extending part forming region And forming a radially extending portion forming region constituting the radially extending portion, and edgewise with the axis along the short side as a bending fulcrum with respect to the radially extending portion forming region Bending to form the folded portion, and
2. The method for manufacturing a single-phase bus ring according to claim 1, wherein the masking is also performed on at least a main surface facing the inside of the folded portion that forms the opening.   The method of manufacturing a single-phase bus ring according to claim 3, wherein the masking is performed so as to entirely cover the folded portion. Of the pair of end portions of the plurality of stator coils wound around the plurality of teeth of the stator, the other end portions other than the one end portion for electrically connecting the in-phase coils are electrically connected. A plurality of arc regions arranged in series in the circumferential direction along the circumferential direction so as to be positioned on a circle concentric with the central axis of the stator, and a neutral point bus ring; A connecting region for connecting opposite edges of adjacent arc regions, and a plurality of connecting regions provided in the same number as the number of the plurality of stator coils, wherein at least a part of the arc region is an axis of the stator A pair of connecting regions extending radially outward from the opposite edges of adjacent arc regions in a state where a space is formed between them, with reference to the central axis of the stator. The extension piece and the one Of and a bridge portion connecting the radially outer ends between the extending piece, in the manufacturing method of the other end bus ring neutral point which is capable of being inserted in said stator coil within said space,
Preparing a long conductive rectangular wire whose cross-sectional shape is a rectangular shape defined by a pair of long sides and a pair of short sides;
The length of the conductive rectangular wire along the long side is larger than the long side, and the length of the conductive rectangular wire along the longitudinal direction is the thickness of the other end of the stator coil. A space forming member that is made larger is moved relative to the main surface of the connecting region forming portion forming the connecting region in the thickness direction of the conductive rectangular wire, and the connecting region of the conductive rectangular wire is Forming the pair of extending pieces in a state in which the tip side is connected via the bridge part by performing flatwise bending on the connection region forming part forming
A ring forming step of forming the conductive rectangular wire into a circular shape concentric with the stator in a state where the long side of the conductive rectangular wire subjected to flatwise bending is along the central axis of the stator; ,
The conductive rectangular wire is covered with an insulating member in a state in which at least a main surface facing the inside of the bridge portion and a main surface facing the inside of a portion adjacent to the bridge portion of the pair of extending pieces are masked. The manufacturing method of the neutral point bus ring characterized by including an insulating member coating process.   The neutral point bus ring according to claim 5, wherein the masking is performed so as to entirely cover a portion of the bridge portion and the pair of extending pieces adjacent to the bridge portion. Production method.