JP7131140B2 - Stator and stator manufacturing method - Google Patents

Description

The present invention relates to a stator and a stator manufacturing method.

Conventionally, terminal wires of a coil wound around a stator core are connected to a stator of a motor (see Patent Document 1, for example).
In the stator of Patent Document 1, a plurality of grooves in which coil end wires can be routed are formed on the radially outer side of an insulator attached to a stator core. I am connecting the coils.

JP 2011-205817 A

By the way, in the stator as described above, since the terminal wires are routed radially outward of the insulator, there is a concern that the stator may be enlarged in the radial direction.
SUMMARY OF THE INVENTION An object of the present invention is to provide a stator and a method for manufacturing the stator that suppresses the increase in size in the radial direction.

A stator for solving the above problems is a stator in which a plurality of phase coils are wound around a stator core. It has a guide member for guiding the end wire of the coil, the guide member has a plurality of stepped portions so that the diameter gradually decreases toward the side opposite to the stator core in the axial direction, and the multi-phase Among the coils, the coils that are routed in the same direction in the circumferential direction are wired in the same stepped portion, and the guide member guides the terminal wires of the coils from the radially outer side to the radially inner side. A notch leading to a stepped portion is provided, and the notch guides the terminal wire of the coil from the radially outer side to the radially inner side to the stepped portion having the smallest diameter and located closest to the stator core side. The first cutout includes a radial cutout portion that is cut in the radial direction, and a circumferential cutout portion that is cut out from the radially inner side of the radial cutout portion to both sides in the circumferential direction. and the circumferential notch portion of the first notch is formed in the stepped portion having the smallest diameter .

According to the above aspect, since the terminal wire is guided with respect to the guide member arranged at the axial end of the stator core, an increase in the size of the guide member in the radial direction can be suppressed. In addition, since the coils that are routed in the same direction among the terminal wires of the coil are wired in the same stepped portion, the guide member can be simplified as compared with the case where the stepped portion is provided corresponding to each terminal wire. can be improved.

According to the above aspect, by providing the notch, the end wire of the coil can be guided and held by the notch.

According to the above aspect, the first notch includes the radial notch portion that is notched in the radial direction, and the circumferential notch portion that is notched on both sides in the circumferential direction from the radially inner side of the radial notch portion. , the end wires of the two coils can be held and guided by the circumferential cutouts cut on both sides in the circumferential direction.

In the stator described above, it is preferable that the guide member has a partition portion that separates the coils arranged on the same stepped portion at a position adjacent to the notch.
According to the aspect described above, by providing the partition portion, it is possible to separate the coils arranged on the same stepped portion, thereby suppressing interference between the coils.

In the stator, it is preferable that a plurality of cutouts be provided in the same stepped portion among the plurality of stepped portions, and end portions of the plurality of cutouts be arranged radially shifted.

According to the above aspect, since the cutouts are arranged with a radial shift, the end wires of the coil guided from the cutouts can naturally be arranged with a radial shift.
In the stator, the stepped portion is provided with a terminal wire regulating portion having a barb extending in the axial direction, and the axial distance from the tip of the barb in the axial direction to the bottom of the stepped portion is the length of the coil. It is preferably smaller than the wire diameter.

According to the above aspect, the stepped portion is provided with the terminal wire regulating portion having the barb extending in the axial direction, and the axial distance from the axial tip of the barb to the bottom of the stepped portion is equal to the wire diameter of the coil. By adopting a smaller configuration, it is possible to suppress radial deviation of the terminal wire of the coil.

In the stator described above, it is preferable that the bottom of the stepped portion axially facing the terminal wire restricting portion is hollowed out.
According to the above aspect, since the bottom of the step portion axially facing the terminal wire restricting portion is hollowed out, it is possible to easily wire the terminal wire to the terminal wire restricting portion.

A stator manufacturing method for solving the above-described problems is a stator manufacturing method having any of the above-described configurations, comprising: a bending step of bending radially outward an end wire of the coil pulled out from one axial direction side of the stator core; After the bending step, an assembling step of assembling the guide member to one side of the stator core in the axial direction; and a wiring step of wiring the coils so that they are on the same stepped portion.

According to the aspect described above, since the bending process is performed before the assembling process, it is possible to suppress interference with the terminal wire when assembling the guide member, thereby facilitating the assembling process.

In the above stator manufacturing method, it is preferable that, in the wiring step, the coils before being routed are maintained in a bent state during the bending step.
According to the above aspect, the coil before being routed in the routing step is maintained in a bent state during the bending step, so that interference with the coil before being routed can be suppressed when the coil is routed. The rope process can be facilitated.

According to the stator and stator manufacturing method of the present invention, it is possible to suppress the increase in size in the radial direction.

1 is a schematic configuration diagram of a motor in one embodiment; FIG. The top view of the stator which shows the state which removed the guide member in the same embodiment. The perspective view of the stator in the same embodiment. FIG. 3 is an exploded perspective view of the stator in the same embodiment; The perspective view of the guide member in the same embodiment. The top view of the guide member in the same embodiment. The top view which shows a part of guide member in the same embodiment. Sectional drawing of the stator in the same embodiment. The top view which shows some stators in the same embodiment. The top view of the stator in the same embodiment. The top view which shows some stators in the same embodiment. The side view which shows some stators in the same embodiment. Sectional drawing which shows a part of guide member in the same embodiment. The top view which shows some stators in the same embodiment. Sectional drawing which shows some stators in the same embodiment. (a) to (d) are cross-sectional views of a drawer guide of the guide member in the same embodiment. Sectional drawing of the guide for a drawer of the guide member in the same embodiment. Explanatory drawing for demonstrating the manufacturing method of the stator in the same embodiment. Explanatory drawing for demonstrating the manufacturing method of the stator in the same embodiment. Explanatory drawing for demonstrating the manufacturing method of the stator in the same embodiment. Explanatory drawing for demonstrating the manufacturing method of the stator in the same embodiment.

An embodiment of a motor having a stator will be described below with reference to the drawings. In the drawings, for convenience of explanation, part of the configuration may be exaggerated or simplified. Also, the dimensional ratio of each part may differ from the actual one.

As shown in FIG. 1, a motor 10 is used in an electric brake system. The electric brake system includes a hydro unit 11 that adjusts the hydraulic pressure of the brake fluid, a motor 10 that is connected to the hydro unit 11 to drive the hydro unit 11, and an EDU (Electric Driver Unit) 12 that controls the drive of the motor 10. and In the brake system of this example, a hydro unit 11 is interposed between the EDU 12 and the motor 10 . The motor 10 and the EDU 12 are electrically connected through a through hole 11b provided in the housing 11a of the hydro unit 11. As shown in FIG.

A motor 10 of this embodiment has a rotor 20 and a stator 30 .
As shown in FIG. 1 , the rotor 20 has a rotor core 21 , magnets (not shown) provided on the rotor core 21 , and a rotating shaft 22 provided at the radial center of the rotor core 21 . The rotating shaft 22 is directly or indirectly connected to the gear 11c in the hydro unit 11 at one axial end thereof. As a result, the rotary shaft 22 rotates, thereby driving the gear 11c in the hydro unit 11 and adjusting the hydraulic pressure of the brake fluid.

As shown in FIGS. 2 to 4, the stator 30 includes a stator core 31, an insulator 32 for the stator core 31, and a stator coil 33. As shown in FIGS.
The stator core 31 has a substantially annular annular portion 31a and a plurality of teeth 31b extending radially inward from the annular portion 31a. For example, twelve teeth 31b are provided in this embodiment. A stator coil 33 is wound around each tooth 31b with an insulator 32 interposed therebetween. The stator coil 33 is wound by concentrated winding, for example.

The stator coil 33 includes a first three-phase winding 40 electrically connected to a first inverter circuit (not shown) and a second three-phase winding 50 electrically connected to a second inverter circuit (not shown). have That is, in the present embodiment, the three-phase windings 40 and 50 are excited by supplying current to each of the three-phase windings 40 and 50 by two systems of inverter circuits.

As shown in FIG. 2, the first three-phase winding 40 has a plurality of three-phase windings 41a to 41f supplied with three-phase alternating currents 120 degrees out of phase from the first inverter circuit. The plurality of three-phase windings 41a to 41f include a U+ phase winding 41a, a U− phase winding 41b, a V+ phase winding 41c, a V− phase winding 41d, a W+ phase winding 41e, and a W− phase winding. and a phase winding 41f.

As shown in FIG. 2, the second three-phase winding 50 has a plurality of three-phase windings 51a to 51f supplied with three-phase AC currents 120 degrees out of phase from the second inverter circuit. The plurality of three-phase windings 51a to 51f include an X+phase winding 51a, an X-phase winding 51b, a Y+phase winding 51c, a Y-phase winding 51d, a Z+phase winding 51e, and a Z-phase winding 51e. and a phase winding 51f.

The stator coil 33 of this embodiment includes, for each tooth 31b, a U+phase winding 41a, a W-phase winding 41f, a Z+phase winding 51e, a V+phase winding 41c, a Y-phase winding 51d, a U-phase winding 41b, X+phase winding 51a, Z-phase winding 51f, W+phase winding 41e, Y+phase winding 51c, V-phase winding 41d, and X-phase winding 51b are wound in this order. It is

Here, the U+-phase winding 41a and the U--phase winding 41b are wound in opposite winding directions around the teeth 31b. The V+ phase winding 41c and the V− phase winding 41d are wound in opposite directions around the teeth 31b. The W+-phase winding 41e and the W--phase winding 41f are wound in opposite directions around the teeth 31b. The U+-phase winding 41a and the U--phase winding 41b are wound around the teeth 31b provided at positions different from each other by 150 degrees in the circumferential direction. The V+ phase winding 41c and the V− phase winding 41d are wound around the teeth 31b provided at positions 150 degrees apart from each other in the circumferential direction. The W+-phase winding 41e and the W--phase winding 41f are wound around teeth 31b provided at positions 150 degrees apart from each other in the circumferential direction.

In addition, the X+ phase winding 51a and the X− phase winding 51b are wound in opposite directions around the teeth 31b. The Y+-phase winding 51c and the Y--phase winding 51d are wound in opposite directions to each other around the teeth 31b. The Z+-phase winding 51e and the Z--phase winding 51f are wound in opposite directions around the teeth 31b. The X+-phase winding 51a and the X-phase winding 51b are wound around teeth 31b provided at positions 150 degrees apart from each other in the circumferential direction. The Y+-phase winding 51c and the Y--phase winding 51d are wound around teeth 31b provided at positions 150 degrees apart from each other in the circumferential direction. The Z+-phase winding 51e and the Z--phase winding 51f are wound around teeth 31b provided at positions 150 degrees apart from each other in the circumferential direction.

The U+-phase winding 41a and the U--phase winding 41b are connected by a connecting wire (not shown). The V+ phase winding 41c and the V− phase winding 41d are connected by a connecting wire (not shown). The W+ phase winding 41e and the W− phase winding 41f are connected by a connecting wire (not shown). The X+ phase winding 51a and the X− phase winding 51b are connected by a connecting wire (not shown). The Y+-phase winding 51c and the Y--phase winding 51d are connected by a connecting wire (not shown). The Z+-phase winding 51e and the Z--phase winding 51f are connected by a connecting wire (not shown).

The first three-phase winding 40 of this embodiment is connected to the first inverter circuit by delta connection. A second three-phase winding 50 is connected in a delta connection to the second inverter circuit. More specifically, the terminal line 33a of the U+-phase winding 41a is connected to the electrically same terminal of the first inverter circuit together with the terminal line 33a of the adjacent W--phase winding 41f. The terminal wire 33a of the U-phase winding 41b and the terminal wire 33a of the V+ phase winding 41c are electrically connected to the same terminal of the first inverter circuit. The terminal line 33a of the W+ phase winding 41e and the terminal line 33a of the V- phase winding 41d are connected to the same terminal of the first inverter circuit.

The terminal line 33a of the X-phase winding 51b is connected to the electrically same terminal of the second inverter circuit together with the Y+phase winding 51c. The terminal line 33a of the Y-phase winding 51d is connected to the electrically same terminal of the second inverter circuit together with the Z+-phase winding 51e. The terminal wire 33a of the Z− phase winding 51f is connected to the electrically same terminal of the second inverter circuit together with the X+ phase winding 51a.

As shown in FIG. 1 , the stator 30 is provided with a guide member 60 on the hydro unit 11 side, which is one axial side of the stator core 31 .
The guide member 60 guides the terminal wire 33 a of the stator coil 33 to the EDU 12 and has a guide body 61 and a drawer guide 81 .

As shown in FIGS. 5 and 6, the guide body 61 has a lower stepped portion 62, a middle stepped portion 63, and an upper stepped portion 64 to form a three-stepped shape.
The lower step portion 62 has a bottom portion 62a that extends in the radial direction and faces the axial direction, and a stepped portion 62b that extends in the axial direction from the inside of the bottom portion 62a in the radial direction and faces the radial direction.

The intermediate stepped portion 63 has a bottom portion 63a extending in the radial direction and facing in the axial direction, and a step portion 63b extending in the axial direction from the inner side in the radial direction of the bottom portion 63a and facing in the radial direction. The bottom portion 63a is configured to radially extend from the axial tip portion of the stepped portion 62b.

The upper stepped portion 64 has a bottom portion 64a that extends radially and faces the axial direction, and a stepped portion 64b that extends axially from the inner side of the bottom portion 64a in the radial direction and faces the radial direction. The bottom portion 64a is configured to radially extend from the axial end portion of the stepped portion 63b.

The lower step portion 62 is positioned closer to the stator core 31 than the middle step portion 63 and the upper step portion 64 in the axial direction when the guide body 61 is attached to one axial side of the stator core 31 . The middle section 63 is positioned between the lower section 62 and the upper section 64 . The upper step portion 64 is located on the side opposite to the stator core 31 relative to the lower step portion 62 and the middle step portion 63 in the axial direction when the guide body 61 is attached to one axial side of the stator core 31 . The lower step portion 62 is located radially outside the middle step portion 63 and the upper step portion 64 . The upper step portion 64 is located radially inward of the lower step portion 62 and the middle step portion 63 . That is, the guide body 61 of the present embodiment is spaced apart from the stator core 31 in the axial direction in order from the radially outer lower step portion 62 and has a smaller outer diameter (that is, the diameter is reduced).

The guide body 61 also includes a plurality of cutouts 65 that guide the terminal wires 33a of the stator coil 33 from the radially outer side to the radially inner side. Notch 65 includes a first notch 66 and a second notch 67 . In this embodiment, the guide body 61 has two first cutouts 66 and six second cutouts 67 .

As shown in FIG. 7, the first notch 66 can draw in two terminal wires 33a of the coil 33, and the second notch 67 can draw in the terminal wire 33a of one coil 33. be.

As shown in FIG. 11 , each first notch 66 includes a guide portion 66a that is cut in the radial direction, and two holding portions 66b that communicate with the guide portion 66a to hold the terminal wire 33a of the coil 33. , 66c.

The guide portion 66a, which is a radial cutout portion, has a shape that expands outward in the radial direction at the bottom portion 62a of the lower step portion 62. As shown in FIG. This makes it easier to guide the terminal wire 33a of the coil 33. As shown in FIG.

The holding portion 66b as a circumferential cutout communicates with the guide portion 66a on the radially inner side of the guide portion 66a and is cut so as to extend to one side in the circumferential direction. The holding portion 66c communicates with the guide portion 66a on the radially inner side of the guide portion 66a, and is notched so as to extend to the other side in the circumferential direction. That is, the holding portion 66b and the holding portion 66c are notched so as to extend in opposite directions in the circumferential direction.

In addition, one holding portion 66b has a circumferential convex portion 66d extending in the circumferential direction on the radially outer side. It is possible to suppress interference with the terminal line 33a routed in.

The second notch 67 has a radially notched guide portion 67a and a holding portion 67b that communicates with the guide portion 67a and holds the terminal wire 33a of the coil 33 .
The guide portion 67a as a radially cutout portion has a shape that expands outward in the radial direction at the bottom portion 62a of the lower step portion 62 in the same manner as the first notch 66 . This makes it easier to guide the terminal wire 33a of the stator coil 33. As shown in FIG.

The holding portion 67b as a circumferential cutout portion communicates with the guide portion 67a on the radially inner side of the guide portion 67a and is cut out so as to extend in one circumferential direction or the other circumferential direction.

Further, a partition portion 68 extending in the axial direction is provided around the first notch 66 at a location where terminal wires 33a of different phases on the same stepped portions 62, 63, 64 are likely to interfere. In this example, a partition portion 68 is formed in the middle step portion 63 and the upper step portion 64 . The partition portion 68 is arranged radially outward from the stepped portions 63b and 64b. The terminal wire 33 a that passes radially inside (inside) is first inserted into the gap and routed, and then the other terminal wire 33 a is routed radially outside (outside) the partition portion 68 .

The middle step portion 63 and the upper step portion 64 having the first notch 66 have chamfered portions 63 d and 64 d at the corner portions 63 c and 64 c located radially inside the first notch 66 . Here, when the terminal wire 33a is routed along the first notch 66, if tension is applied inward in the radial direction, if the corner is, for example, a right angle, the corner is bent as a starting point, and the stepped portion is deformed. It becomes easier to separate from the stepped portion, which is the radially facing surface. If the terminal wire 33a is routed along the circumferential direction in this state, the position where the terminal wire 33a abuts against the first notch 66 tends to shift radially outward. Therefore, by providing the chamfered portion 64d at the corner portion 64c as described above, the bending starting from the corner portion 64c is suppressed, and the position where the terminal wire 33a abuts against the notch when the terminal wire 33a is routed along the circumferential direction is suppressed. is suppressed from shifting radially outward.

As shown in FIGS. 6, 12, and 13, the guide body 61 is provided with a plurality of terminal wire restricting portions 69 extending radially from the stepped portions 62b, 63b, and 64b. Five terminal wire restricting portions 69 of this example are provided for each of the stepped portions 62b, 63b, and 64b. Each terminal wire restricting portion 69 has an extension portion 69a radially extending from each of the stepped portions 62b, 63b, 64b, and a projection 69b axially extending from the distal end side of the extension portion 69a. The axial distance L1 from the axial tip of the protrusion 69b to the bottoms 62a, 63a, and 64a of the stepped portions 62, 63, and 64 is smaller than the wire diameter of the terminal wire 33a, so that the terminal wire 33a is displaced in the radial direction. can be suppressed.

The extending portion 69a restricts axial movement of the terminal wire 33a of the stator coil 33 drawn around the bottom portions 62a, 63a, 64a. The protrusions 69b restrict radial movement of the terminal wires 33a of the stator coil 33 that are routed around the bottom portions 62a, 63a, and 64a. By restricting the movement of the terminal wire 33a in the radial direction and the axial direction in this manner, the vibration of the terminal wire 33a can be suppressed. In addition, by restricting the movement of the terminal wire 33a in the radial direction, it is possible to prevent the other terminal wire from being hindered when the other terminal wire is routed. That is, it becomes possible to perform wiring easily.

Here, each of the bottom portions 62a, 63a, 64a is provided with a lightening portion 70 formed by lightening a portion facing the terminal wire restricting portion 69 in the axial direction. As a result, the terminal wire 33a can be temporarily bent toward the lightening portion 70, so that the clearance between the terminal wire regulating portion 69 and the terminal wire 33a can be narrowed, and the terminal wire 33a can be moved from the lightening portion 70. It can be stably held between the peripheral bottom portions 62 a , 63 a , 64 a and the terminal wire restricting portion 69 .

As shown in FIGS. 3 to 5, the guide member 60 extends downward from the lower surface of the bottom portion 62a of the lower step portion 62, and is provided with a plurality of attachment pieces 71 for attachment to the insulator 32 of the stator core 31. As shown in FIGS. The mounting piece 71 and the insulator 32 are axially engaged by a so-called snap-fit structure. This prevents the guide member 60 from falling off from the stator core 31 (insulator 32).

As shown in FIGS. 3 to 5, the guide member 60 extends downward from the lower surface of the bottom portion 62a of the lower step portion 62, and is attached to the stator core 31 (insulator 32). A plurality of leg portions 72 are provided to abut against each other in the axial direction. The contact of the legs 72 with the stator core 31 and the axial engagement between the mounting pieces 71 and the insulators 32 due to the snap-fit structure allow the guide member 60 to be fixed within a certain range in the axial direction. As a result, the guide member 60 and the stator core 31 (insulator 32) are relatively movable within a certain range in the axial direction, that is, some backlash is allowed.

As shown in FIGS. 3 and 9, the guide member 60 is provided with a convex restricting portion 73 extending toward the stator core 31 in the axial direction. The restricting portion 73 extends from the lower surface of the bottom portion 62a of the lower step portion 62 toward the stator core 31 side. The restricting portion 73 surrounds the axially extending portion 33 b of the coil 33 with the insulator 32 and the coil 33 in a state where the guide member 60 is attached to the stator core 31 . This restricts the movement of the axially extending portion 33b. An axial tip portion of the restricting portion 73 is disposed between circumferentially adjacent coils and has a tapered shape that follows the coil end.

As shown in FIG. 8, when the winding direction of the coil 33 (end wire 33a) in the circumferential direction is the direction in which the winding of the end wire 33a around the stator core 31 is loosened, the radially inner end portion of the notch 67 By providing the holding portion 67b on the axially extending portion 33b, even when the terminal wire 33a is wound in the circumferential direction, the holding portion 67b is prevented from moving in the direction of loosening the winding of the coil.

Further, each stepped portion 62 , 63 , 64 of the guide body 61 has a consolidation portion 74 for consolidating the terminal wires 33 a routed to each stepped portion 62 , 63 , 64 .
As shown in FIGS. 6, 10 and 14, the aggregated portion 74 is provided with a plurality of loose fitting portions 75 . Two loose fitting portions 75 are provided for each of the stepped portions 62, 63, and 64, for a total of six.

6, 10 and 14, the loose fitting portion 75 is provided so as to extend radially outward from the stepped portions 62b, 63b, 64b of the stepped portions 62, 63, 64 facing radially outward.
The loose fitting portion 75 has a holding portion 75a and an introduction portion 75b. The holding portion 75a has an opening area larger than the wire diameter of the terminal wire 33a and has a shape that is open in the axial direction. The lead-in portion 75b has a radially open shape that is smaller than the wire diameter of the terminal wire 33a on the radially outer side of the holding portion 75a. The terminal wire 33a can be introduced from the radially outer side into the holding portion 75a by the introduction portion 75b. In addition, even if two terminal wires 33a are introduced into the holding portion 75a, the holding portion 75a is loosely fitted, so excessive tension is not applied to the terminal wires 33a, and damage to the terminal wires 33a is suppressed.

As shown in FIG. 15, a lightening portion 76 is formed in the bottom portion on the side opposite to the direction (upper side) in which the terminal wire 33a of the loose fitting portion 75 is pulled out in the axial direction. As a result, when the terminal wire 33a is pulled out in the axial direction and erected, the terminal wire 33a can be bent toward the lightening portion 76, and the terminal wire 33a can be erected from the loose fitting portion 75 along the axial direction.

16(a) to (d) and FIG. 17, the drawer guide 81 is configured to have a long columnar shape in the axial direction. The drawer guide 81 has six through holes 82 respectively corresponding to the six loose fitting portions 75 when attached to the guide body 61 .

Each through hole 82 is configured to axially face the loose fitting portion 75 when the drawer guide 81 is attached to the guide body 61 . Each through hole 82 is formed along the longitudinal direction (that is, the axial direction) of the drawer guide 81 .

The drawer guide 81 is made of an insulating material such as resin. Therefore, the terminal wire 33a inserted through the through-hole 82 of the drawer guide 81 is insulated from the other terminal wires 33a inserted through the other through-holes 82 . Similarly, the housing 11a of the hydro unit 11 and the terminal wires 33a inserted through the through holes 82 are insulated.

As shown in FIGS. 16(a) to (d) and FIG. 17, each through hole 82 has an opening area of an inlet 82a located on the stator core 31 side larger than an opening area of an outlet 82b located on the anti-stator core 31 side. is also wider. The opening area of each through hole 82 gradually decreases from the introduction port 82a side to the outlet port 82b side. The inner peripheral surface of the through hole 82 is curved.

As shown in FIG. 16A, the through-hole 82 has a substantially rectangular opening on the side of the introduction port 82a. As shown in FIG. 16(d), the through-hole 82 has an oval opening on the outlet port 82b side. As shown in FIG. 16(b), the through hole 82 has a triangular shape of constant width at an intermediate position between the inlet 82a and the outlet 82b. With such a configuration, the through-hole 82 guides the direction in which the plurality of terminal wires 33a inserted therein are arranged in a predetermined direction. In addition, the through-hole 82 has a triangular shape of constant width (so-called Reuleaux triangle shape) in the middle position. , the terminal wire 33a can be moved, and the position of the terminal wire 33a can be adjusted.

Further, since the opening area of the through hole 82 on the introduction port 82a side is sufficiently larger than that of each terminal wire 33a, each terminal wire 33a is in an unfixed state. Here, since the longer the unfixed length of the terminal wire 33a is, the lower the resonance frequency becomes, the resonance frequency can be increased by providing a portion having a constant cross-sectional area within a predetermined range from the lead-out port 82b.

Next, a method for manufacturing the stator of this embodiment will be described.
As shown in FIG. 18, the coil 33 is wound around the teeth 31b of the stator core 31. As shown in FIG.
Next, as shown in FIG. 18, the terminal wires 33a of the coils 33 wound around the teeth 31b of the stator core 31 are pulled out in the axial direction and bent in the radial direction (bending step).

As shown in FIG. 19, the guide body 61 of the guide member 60 is assembled to the one end side (upper side) of the stator core 31 in the axial direction (assembly step). At this time, since each terminal wire 33a is bent in the radial direction in the bending process, interference between the guide member 60 and the terminal wire 33a is suppressed.

As shown in FIG. 20, the terminal wire 33a is drawn into the corresponding notches 66, 67. As shown in FIG. At this time, the end wires 33a of the phase windings connected to the same terminal are pulled into the corresponding cutouts 66 and 67. As shown in FIG.

As shown in FIG. 21, the end wires 33a of the coils 33 of the plurality of phases, which are routed in the same direction in the circumferential direction, are placed on the same stepped portion 64 with respect to the upper stepped portion 64 of the guide member 60, as shown in FIG. (wiring step). Each terminal wire 33a is held by the loose fitting portion 75 and drawn out in the axial direction (drawing step). The wiring process and the drawing process are repeated for each terminal wire 33a. In this example, wiring is performed repeatedly in order from the terminal wire 33a that is wired radially inward (upper stage portion 64 side).

After that, the drawer guide 81 is passed through the through hole 11b provided in the housing 11a of the hydro unit 11 while the terminal wire 33a held by each loose fitting portion 75 is inserted through the through hole 82 of the drawer guide 81. are electrically connected to each inverter circuit formed on the circuit board in the EDU 12 .

The effect of this embodiment will be described.
(1) Since the terminal wire 33a is guided with respect to the guide member 60 disposed at the axial end of the stator core 31, the increase in size of the guide member 60 in the radial direction is suppressed. In addition, the coils 33 that are routed in the same direction among the terminal wires 33a of the coil 33 are routed to the same stepped portions 62, 63, 64, so that the stepped portions 62, 63 correspond to the terminal wires 33a. , 64, the guide member 60 can be simplified.

(2) By providing the cutouts 66 and 67, the end wire 33a of the coil 33 can be guided and held by the cutouts 66 and 67.
(3) The notch 66 has a guide portion 66a notched in the radial direction and holding portions 66b and 66c notched on both sides in the circumferential direction from the radially inner side of the guide portion 66a. The end wires 33a of the two coils 33 can be held and guided by the holding portions 66b and 66c cut on both sides.

(4) By providing the partition portion 68, the terminal wires 33a of the coils 33 arranged on the same stepped portions 62, 63, 64 can be separated from each other, and interference between the terminal wires 33a can be suppressed. .

(5) By arranging the notch 67 with a radial shift, the terminal wire 33a of the coil 33 guided from the notch 67 can naturally be arranged with a radial shift.
(6) The stepped portions 62, 63, and 64 are provided with terminal wire restricting portions 69 having projections 69b extending in the axial direction, and the bottom portions 62a of the stepped portions 62, 63, and 64 are provided from the axial ends of the projections 69b. , 63a and 64a in the axial direction is set to be smaller than the wire diameter of the terminal wire 33a of the coil 33, so that the radial displacement of the terminal wire 33a of the coil 33 can be suppressed.

(7) The bottoms 62a, 63a, and 64a of the stepped portions 62, 63, and 64 axially facing the terminal wire restricting portion 69 have hollowed portions 70, so that the terminal wire with respect to the terminal wire restricting portion 69 is The routing of 33a can be facilitated.

(8) By including the bending process before the assembling process, it is possible to suppress interference with the terminal wire when assembling the guide member 60 to the stator core 31, and the assembling process can be facilitated.

(9) In the wiring step, the terminal wire 33a of the coil 33 before being routed is maintained in the bent state during the bending step, so that the terminal wire 33a of the coil 33 before being routed is Interference with 33a can be suppressed, and the wiring process can be facilitated.

It should be noted that the above embodiment can be implemented with the following modifications. The above embodiments and the following modifications can be combined with each other within a technically consistent range.

In the above-described embodiment, the guide body 61 of the guide member 60 has the lower step portion 62, the middle step portion 63, and the upper step portion 64, and has a three-step shape, but the present invention is not limited to this. For example, the guide body may have a two-step shape. With such a configuration, the size of the guide body can be reduced.

In the above-described embodiment, the first notch 66 has the holding portions 66b and 66c that are notched on both sides in the circumferential direction from the radially inner side of the guide portion 66a. A configuration in which either one of 66c is omitted, that is, a configuration in which the second notch 67 is used instead of the first notch 66, for example, may be adopted. When the second notch 67 is used instead of the first notch 66, two second notches 67 are provided for one first notch 66, thereby having substantially the same function.

In the above embodiment, the cutouts 67 provided in the same stepped portions 62, 63, 64 are formed to be radially shifted. The cutouts 67 provided in the can be aligned in the radial direction.

- In the above-described embodiment, the configuration in which the partition 68 is provided at a position adjacent to the notch 65 is adopted, but a configuration in which the partition is omitted may be adopted.
- In the above-described embodiment, the notch 65 is provided to guide the coil 33 from the radially outer side to the radially inner side to the stepped portions 62, 63, and 64, but the configuration may be omitted.

In the above embodiment, the axial distance L1 between the protrusion 69b of the terminal wire restricting portion 69 and the bottoms 62a, 63a, 64a is smaller than the wire diameter of the coil 33 (that is, the terminal wire 33a). Instead, for example, the axial distance L1 and the wire diameter of the coil 33 may be substantially the same.

In the above-described embodiment, the lightening portion 70 is provided at the portion facing the terminal wire restricting portion 69 in the axial direction, but the lightening portion 70 may be omitted.
- In the above-described embodiment, the terminal wire restricting portion 69 is provided, but a configuration in which the terminal wire restricting portion 69 is omitted may be employed.

In the above embodiment, for each tooth 31b, for example, U+ phase winding 41a, W− phase winding 41f, Z+ phase winding 51e, V+ phase winding 41c, Y− phase winding 51d, U− phase winding 41b, X+phase winding 51a, Z-phase winding 51f, W+phase winding 41e, Y+phase winding 51c, V-phase winding 41d, and X-phase winding 51b. , but not limited to this. For example, U+ phase winding 41a, Z+ phase winding 51e, W− phase winding 41f, Y− phase winding 51d, V+ phase winding 41c, X+ phase winding 51a, U− phase winding 41b, Z− phase A configuration in which the winding 51f, the W+ phase winding 41e, the Y+ phase winding 51c, the V-phase winding 41d, and the X-phase winding 51b are wound in this order for each tooth 31b may be employed.

In the above embodiment, two inverter circuits serving as two system power sources are provided to provide redundancy. may be employed.

- In the above-described embodiment, two terminal wires 33a are arranged in each of the loose fitting portions 75, but the present invention is not limited to this. For example, when the motor is driven by one inverter circuit as described above, a configuration in which four terminal wires 33a are routed to one loose fitting portion 75 may be adopted.

DESCRIPTION OF SYMBOLS 30... Stator 31... Stator core 33... Coil 33a... Terminal line 60... Guide member 62... Lower step part (step part) 63... Middle step part (step part) 64... Upper step part (step part), 65 ... Notch 66 ... First notch (notch) 67 ... Second notch (notch) 66a, 67a ... Guide portion (radial direction notch) 66b, 66c, 67b ... Holding portion (peripheral direction notch portion), 68... Partitioning portion, 69... Terminal line restricting portion, 69b... Projection (return), 81... Guide for drawer, 82... Through hole.

Claims (7)

A stator in which a multi-phase coil is wound around a stator core,
a guide member disposed at one end in the axial direction of the stator core for guiding terminal wires of the multi-phase coils wound around the stator core;
The guide member has a plurality of stepped portions that gradually decrease in diameter toward the side opposite to the stator core in the axial direction,
Among the coils of the plurality of phases, the coils that are routed in the same direction in the circumferential direction are arranged on the same stepped portion ,
The guide member has a notch that guides the end wire of the coil from the radially outer side to the radially inner side to the stepped portion,
The notch includes a first notch that guides the end wire of the coil from the radially outer side to the radially inner side to the stepped portion with the smallest diameter located on the side closest to the stator core,
The first notch has a radial notch portion that is notched in the radial direction, and a circumferential notch portion that is notched on both sides in the circumferential direction from the radially inner side of the radial notch portion,
The stator, wherein the circumferential cutout portion of the first cutout is formed in the stepped portion having the smallest diameter . 2. The stator according to claim 1 , wherein said guide member has a partition portion adjacent to said notch for separating said coils arranged on the same stepped portion. 3. The method according to claim 1, wherein a plurality of said cutouts are provided in the same stepped portion among a plurality of said stepped portions, and end portions of said plurality of said cutouts are arranged to be shifted in a radial direction. stator. The stepped portion is provided with a terminal wire regulating portion having a barb extending in the axial direction, and the axial distance from the axial tip of the barb to the bottom of the stepped portion is smaller than the wire diameter of the coil. , the stator according to any one of claims 1 to 3 . 5. The stator according to claim 4 , wherein the bottom of the stepped portion axially facing the terminal wire restricting portion is hollowed out. A stator manufacturing method according to any one of claims 1 to 5 ,
a bending step of bending radially outward an end wire of the coil pulled out from one axial side of the stator core;
After the bending step, an assembling step of assembling the guide member to one axial side of the stator core;
a step of wiring the stepped portion of the guide member so that the coils of the plurality of phases, which are routed in the same direction in the circumferential direction, form the same stepped portion. Production method. 7. The method of manufacturing a stator according to claim 6 , wherein in the wiring step, the coils before being routed are maintained in a bent state during the bending step.

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