WO2019102640A1

WO2019102640A1 - Motor

Info

Publication number: WO2019102640A1
Application number: PCT/JP2018/026050
Authority: WO
Inventors: 雄策吉田; 梅田　智之; 藤原　英雄
Original assignee: 日本電産株式会社
Priority date: 2017-11-24
Filing date: 2018-07-10
Publication date: 2019-05-31
Also published as: JPWO2019102640A1; CN111373636A

Abstract

One embodiment of a motor according to the present invention is provided with: a rotor having a shaft disposed along a central axis; a stator which has a plurality of coils and which faces a radially outer side of the rotor across a gap; a supporting member which is disposed on one side, in an axial direction, of the stator; and a supported bus bar which is connected to a first conducting wire extending to one side, in the axial direction, from at least one of the plurality of coils, and which is supported by the supporting member. The supporting member includes a first wall portion which supports the supported bus bar from the other side, in the axial direction, a second wall portion which is disposed on said one side, in the axial direction, of the supported bus bar, and a third wall portion which is disposed on the radially outer side of the supported bus bar. A radially inner edge portion of the supported bus bar is exposed on the radially inner side of the supporting member. The supported bus bar has a gripping portion for gripping the first conducting wire, in the radially inner edge portion of the supported bus bar.

Description

motor

The present invention relates to a motor.

A motor is known which comprises a support member supporting a bus bar supplying current to the coil. For example, Patent Document 1 describes a bus bar holder as a support member. The bus bar holder of Patent Document 1 is made by insert molding in which the bus bar is disposed in a mold.

JP, 2015-122880, A

As a method of supporting the above-described bus bar on the support member, for example, there is a method of providing a groove opened on one side in the axial direction to the support member and fitting the bus bar into the groove from the one side in the axial direction . However, in this case, if the dimensions of the bus bar and the dimensions of the groove do not match precisely, there is a problem that the bus bar may easily come off from the groove in the axial direction. Therefore, it is necessary to make the support member and the bus bar accurately, and there is a problem that the manufacturing cost of the motor increases.

An object of the present invention is to provide a motor having a structure that can stably support a supported bus bar by a support member and can suppress an increase in manufacturing cost.

One aspect of the motor according to the present invention includes a rotor having a shaft disposed along a central axis, a stator having a plurality of coils, and facing the radially outer side of the rotor via a gap, and the stator A support bus bar disposed on one side in the axial direction, and a supported bus bar connected to a first lead wire extending to one side in the axial direction from at least one of the plurality of coils, is supported. The support member includes a first wall portion for supporting the supported bus bar from the other side in the axial direction, a second wall portion disposed on the axial direction one side of the supported bus bar, and a radially outer side of the supported bus bar And a third wall disposed at the The radially inner edge portion of the supported bus bar is exposed radially inward of the support member. The supported bus bar has a gripping portion for gripping the first conductive wire at a radially inner edge portion of the supported bus bar.

According to one aspect of the present invention, a motor having a structure capable of stably supporting the supported bus bar by the support member and suppressing an increase in manufacturing cost is provided.

FIG. 1 is a cross-sectional view showing a part of the motor of the present embodiment. FIG. 2 is a top view of the bearing holder and the support member of the present embodiment. FIG. 3 is a perspective view showing the support member of the present embodiment. FIG. 4 is a view of the support member and the neutral point bus bar of the present embodiment as viewed from the upper side. FIG. 5 is a perspective view showing a part of the support member of this embodiment and the neutral point bus bar. FIG. 6 is a perspective view showing a part of the bus bar holder of the present embodiment, a part of the phase bus bar, a part of the bearing holder, and a part of the support member.

The Z-axis direction appropriately shown in each drawing is a vertical direction in which the positive side is "upper side" and the negative side is "lower side". A central axis J appropriately shown in each drawing is an imaginary line which is parallel to the Z-axis direction and extends in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as “axial direction”, and the radial direction centering on the central axis J is simply referred to as “radial direction”. The circumferential direction centered on is simply referred to as "circumferential direction". In the present embodiment, the upper side corresponds to one side in the axial direction, and the lower side corresponds to the other side in the axial direction.

The vertical direction, the upper side and the lower side are simply names for describing the arrangement relationship etc. of each part, and the actual arrangement relationship etc. is an arrangement relationship etc. other than the arrangement relationship etc. shown by these names May be

As shown in FIG. 1, the motor 10 according to this embodiment includes a housing 11, a rotor 20, a stator 30, a bearing holder 50, a support member 40, a neutral point bus bar 70, a bus bar holder 60, and a phase A bus bar 80 and a bearing 90. In the present embodiment, the neutral point bus bar 70 corresponds to a supported bus bar.

The housing 11 accommodates each part of the motor 10 inside. The rotor 20 has a shaft 21, a rotor core 22, and a magnet 23. The shaft 21 is disposed along the central axis J. The shaft 21 has a cylindrical shape with the central axis J as a center. The shaft 21 is rotatably supported about a central axis J by a bearing 90. The rotor core 22 is fixed to the outer peripheral surface of the shaft 21. The magnet 23 is fixed to the outer peripheral surface of the rotor core 22.

The stator 30 faces the rotor 20 in the radial direction via a gap. More specifically, the stator 30 faces the radially outer side of the rotor 20 via a gap. The stator 30 has a stator core 31, an insulator 34, and a plurality of coils 35. The stator core 31 has an annular shape surrounding the rotor 20 at the radially outer side of the magnet 23. The stator core 31 has a core back 32 and a plurality of teeth 33. The core back 32 has an annular shape centered on the central axis J. The teeth 33 project radially inward from the core back 32. The plurality of teeth 33 are arranged at equal intervals along the circumferential direction. The number of teeth 33 is, for example, twelve.

The insulator 34 is a member having an insulating property. The insulator 34 is attached to each of the plurality of teeth 33. The plurality of coils 35 are configured by winding a conductive wire around each of the plurality of teeth 33 via the insulator 34. The number of coils 35 is, for example, twelve.

In the present embodiment, the plurality of coils 35 constitute a plurality of coil groups having different power systems. In the present embodiment, for example, two coil groups having different power systems are configured. That is, the motor 10 of the present embodiment has, for example, two power systems. Each coil group includes, for example, six coils 35. The coils 35 included in each coil group in the present embodiment are arranged adjacent to each other in the circumferential direction.

In the present specification, "a power system of a certain object is different" includes that power is supplied to a certain object independently for each power system. For example, in the present embodiment, three-phase AC power is independently supplied to the coils 35 of coil groups having different power systems.

The bearing holder 50 is disposed on the upper side of the stator 30. The bearing holder 50 is made of metal. The bearing holder 50 holds a bearing 90 that rotatably supports the shaft 21. The bearing holder 50 has an annular portion 51, a fixed cylindrical portion 52, and a bearing holding portion 53. As shown in FIGS. 1 and 2, the annular portion 51 has an annular plate shape whose center is the central axis J and whose plate surface is orthogonal to the axial direction. The radially inner edge portion of the annular portion 51 is bent downward.

As shown in FIG. 1, the fixed cylindrical portion 52 has a cylindrical shape extending downward from the radial outer edge portion of the annular portion 51. The outer peripheral surface of the annular portion 51 and the outer peripheral surface of the fixed cylindrical portion 52 are fixed to the inner peripheral surface of the housing 11. The bearing holder 53 is connected to the radially inner edge of the annular portion 51. The bearing holding portion 53 has a cylindrical portion 53a and a lid portion 53b. The cylindrical portion 53a has a cylindrical shape centered on the central axis J. The outer peripheral surface of the bearing 90 is fixed to the inner peripheral surface of the cylindrical portion 53a. Thereby, the bearing holder 53 holds the bearing 90. The lid 53 b has an annular shape that protrudes inward in the radial direction from the upper end of the cylinder 53 a. The lid 53 b covers the upper side of the outer ring of the bearing 90.

The bearing holder 50 has a holder through hole 51 a which penetrates the bearing holder 50 in the axial direction. The holder through hole 51 a axially penetrates the annular portion 51. As shown in FIG. 2, the holder through hole 51 a has a square shape that is long in the radial direction and viewed from the upper side. The dimension in the circumferential direction of the holder through hole 51 a decreases as it goes from the radially outer side to the radially inner side. A plurality of holder through holes 51a are provided along the circumferential direction. In the present embodiment, for example, six holder through holes 51 a are provided. The six holder through holes 51a are arranged adjacent to each other in the circumferential direction three by three to form two holder through hole groups. The two holder through hole groups are arranged on the opposite side in the radial direction across the central axis J.

As shown in FIG. 1, the coil lead wire 36 is passed through the holder through hole 51 a. The coil lead wire 36 extends upward from at least one of the plurality of coils 35. The coil lead-out wire 36 is an end of a conducting wire that constitutes the coil 35. In the present embodiment, the coil leader 36 extends upward from each of the six coils 35. As shown in FIG. 2, the coil lead wire 36 passes a portion radially outward of the radial center of the holder through hole 51 a. In the present embodiment, the coil leader 36 corresponds to a second conductor.

As shown in FIG. 1, the support member 40 is disposed on the upper side of the stator 30. More specifically, the support member 40 is disposed axially between the stator 30 and the bearing holder 50. The support member 40 is made of resin. As shown in FIGS. 3 and 4, the support member 40 has an annular shape centered on the central axis J. The support member 40 has a coil support portion 41, a bus bar holding portion 42, and a plurality of legs 49. In the present embodiment, two coil support portions 41 and two bus bar holding portions 42 are provided. The two coil support portions 41 are disposed so as to sandwich the central axis J in the radial direction. The two bus bar holding portions 42 are disposed to sandwich the central axis J in the radial direction. The two coil support portions 41 and the two bus bar holding portions 42 are alternately arranged along the circumferential direction.

The coil support portion 41 has an arc shape extending in the circumferential direction. As shown in FIG. 3, the coil support portion 41 has a first outer wall portion 41 a, a top wall portion 41 b, a pair of side wall portions 41 c, and a wire holding portion 43. That is, the support member 40 has the wire holding portion 43.

The first outer wall portion 41 a has a plate shape extending in the circumferential direction. The plate surface of the first outer wall portion 41a is orthogonal to the radial direction. The top wall portion 41 b has a plate shape that protrudes radially inward from an upper end portion of the first outer wall portion 41 a. The plate surface of the top wall portion 41b is orthogonal to the axial direction. The top wall portion 41 b extends in the circumferential direction from an end on one circumferential side of the first outer wall 41 a to an end on the other circumferential side of the first outer wall 41 a. The pair of side wall portions 41c is in the form of a plate projecting radially inward from both end portions in the circumferential direction of the first outer wall portion 41a. The plate surface of the side wall portion 41c is orthogonal to the circumferential direction. The upper end of the side wall 41c is connected to the circumferential end of the top wall 41b.

The conductor holding portion 43 extends in the axial direction. More specifically, the conductor holding portion 43 extends upward from the top wall portion 41b. The wire holding portion 43 has a substantially semi-cylindrical shape that opens radially inward. The wire holding portion 43 has a recess 43 a that is recessed outward in the radial direction and opened inward in the radial direction. That is, the support member 40 has a recess 43a. The inner side surface of the recess 43 a is an inner peripheral surface of the substantially semi-cylindrical conductor holding portion 43. The inside of the recess 43a, that is, the inside of the wire holding portion 43 is open at both axial ends. The inside of the recess 43a penetrates the top wall portion 41b in the axial direction, and opens in the lower surface of the top wall portion 41b.

The coil leader 36 is fitted and held in the recess 43a. Thus, the support member 40 supports the coil leader 36. The radially inner opening of the recess 43a has a circumferential opening width that increases in the radial inner direction. As a result, the coil lead wire 36 can be easily fitted into the recess 43a from the inner side in the radial direction.

As shown in FIG. 2, the lead wire holding portion 43 overlaps the holder through hole 51 a as viewed in the axial direction. More specifically, the lead wire holding portion 43 overlaps with a portion radially outward of the radial center of the holder through hole 51a as viewed in the axial direction. The concave portion 43a overlaps the holder through hole 51a as viewed in the axial direction, and is disposed radially outward of the center of the holder through hole 51a in the radial direction.

In this specification, “the concave portion is disposed radially outward of the radial center of the holder through hole” means that the radial center of the concave portion is in the radial direction rather than the radial center of the holder through hole. It should be outside. That is, "the concave portion is disposed radially outward of the radial center of the holder through hole" means that the radial center of the concave portion is radially outward of the radial center of the holder through hole. For example, it also includes a configuration in which a part of the recess is located radially inward of the radial center of the holder through hole.

According to the present embodiment, the coil lead wire 36 is held in the recess 43a axially overlapping the holder through hole 51a, so that the coil lead wire 36 is located at a position overlapping the holder through hole 51a as viewed along the axial direction. Is positioned. Therefore, the position where the coil lead-out wire 36 passes in the holder through hole 51a can be separated from the inner side surface of the holder through hole 51a. Thus, by inserting the coil lead wire 36 into the recess 43 a, the coil lead wire 36 can be easily passed through the holder through hole 51 a while being insulated from the bearing holder 50.

The recess 43a is disposed radially outward of the center of the holder through hole 51a in the radial direction. Therefore, a portion of the holder through hole 51a through which the coil lead wire 36 passes can be made closer to the outside in the radial direction than the radial center of the holder through hole 51a. Thus, in the state where the coil lead wire 36 is held in the recess 43a, the radial dimension of the portion of the holder through hole 51a located radially inward of the coil lead wire 36 corresponds to the coil of the holder through hole 51a. It can be larger than the radial dimension of the portion located radially outward of the lead wire 36.

Here, since the recess 43a opens radially inward, if the coil lead-out wire 36 is temporarily removed from the recess 43a, the coil lead-out wire 36 moves radially inward from the recess 43a. That is, when the coil lead-out wire 36 is detached from the concave portion 43a, the coil lead-out wire 36 moves to the radially inner portion of the holder through hole 51a having a large dimension in the radial direction. Thereby, even when the coil lead-out wire 36 is detached from the concave portion 43a, it is possible to suppress the contact of the coil lead-out wire 36 with the inner side surface of the holder through hole 51a. Therefore, the coil lead-out wire 36 can be stably insulated from the bearing holder 50.

As described above, according to the present embodiment, the motor 10 having a structure capable of easily and stably insulating the coil lead wire 36 extending from the coil 35 with respect to the metal bearing holder 50 is obtained.

As shown in FIG. 1, at least a part of the wire holding portion 43 is inserted into the holder through hole 51 a. Therefore, the coil lead-out wire 36 can be more stably guided to the holder through hole 51a, and the coil lead-out wire 36 can be more stably insulated from the bearing holder 50. In the present embodiment, the upper portion of the wire holding portion 43 is inserted into the holder through hole 51 a. The upper end of the wire holding portion 43 protrudes above the bearing holder 50 via the holder through hole 51 a. As a result, even when the portion of the coil lead-out wire 36 that protrudes above the wire holding portion 43 is inclined, the contact of the coil lead-out wire 36 with the inner side surface of the holder through hole 51a can be suppressed.

As shown in FIG. 3, a plurality of conductor holding portions 43 are provided along the circumferential direction. In the present embodiment, three conductor holding portions 43 are provided for each coil support portion 41. That is, in the present embodiment, the support member 40 has a total of six conductor holding parts 43. The three conductor holding portions 43 are arranged at equal intervals along the circumferential direction.

The bus bar holding portion 42 includes a second outer wall portion 42a, a lower wall portion 44, an upper wall portion 47, a rib 48, a circumferential wall portion 46, and a pair of protruding

portions

45a and 45b. That is, the support member 40 includes the second outer wall 42a, the lower wall 44, the upper wall 47, the rib 48, the circumferential wall 46, and the pair of

protrusions

45a and 45b. The lower wall portion 44 in the present embodiment corresponds to a first wall portion. The upper wall portion 47 corresponds to a second wall portion. The second outer wall 42a corresponds to a third wall.

The second outer wall portion 42a has a plate shape extending in the circumferential direction. The plate surface of the second outer wall portion 42a is orthogonal to the radial direction. The second outer wall portion 42 a is disposed radially outside the neutral point bus bar 70. The end portions on both sides in the circumferential direction of the second outer wall portion 42 a connect the circumferential end portions of the first outer wall portion 41 a in the coil support portion 41 adjacent to both sides in the circumferential direction of the bus bar holding portion 42. The first outer wall portion 41a in the two coil support portions 41 and the second outer wall portion 42a in the two bus bar holding portions 42 are alternately connected in the circumferential direction, and form a cylindrical portion centered on the central axis J Do.

The lower wall portion 44 has a plate shape projecting radially inward from the lower end portion of the second outer wall portion 42a. The plate surface of the lower wall portion 44 is orthogonal to the axial direction. The lower wall portion 44 extends in the circumferential direction from an end on one circumferential side of the second outer wall 42 a to an end on the other circumferential side of the second outer wall 42 a. The end portions on both sides in the circumferential direction of the lower wall portion 44 are connected to the side wall portions 41 c of the coil support portions 41 adjacent in the circumferential direction. The lower wall portion 44 has a first lower wall portion 44a and a second lower wall portion 44b.

The first lower wall portion 44 a is a radially outer portion of the lower wall portion 44. The second lower wall portion 44 b is a radially inner portion of the lower wall portion 44 and is connected to the radially inner edge portion of the first lower wall portion 44 a. The upper surface of the first lower wall 44 a is disposed above the upper surface of the second lower wall 44 b. Thus, on the upper surface of the lower wall portion 44, a step is provided which is recessed downward from the radially outer side toward the radially inner side.

The lower wall portion 44 has a wall portion through hole 44 c axially penetrating the lower wall portion 44. In the present embodiment, the wall through hole 44c axially penetrates the first lower wall 44a. The wall portion through hole 44c has a substantially rectangular shape with rounded corners when viewed along the axial direction. Two wall portion through holes 44 c are provided along the circumferential direction for each one bus bar holding portion 42.

The upper wall portion 47 has a rectangular plate shape which protrudes inward in the radial direction from the upper end portion of the second outer wall portion 42a. The plate surface of the upper wall portion 47 is orthogonal to the axial direction. As shown in FIG. 4, the radially inner end portion of the upper wall portion 47 is disposed radially outward of the second lower wall portion 44 b. Two upper wall portions 47 are provided along the circumferential direction for each one bus bar holding portion 42. As shown in FIG. 3, the two upper wall portions 47 overlap with the two wall portion through holes 44 c as viewed in the axial direction. That is, the lower wall portion 44 has a wall portion through hole 44 c at a position overlapping with the upper wall portion 47 as viewed in the axial direction. Therefore, for example, when the support member 40 is formed by resin molding using a mold, the upper wall portion 47 can be easily molded using two molds separated in the axial direction.

As shown in FIG. 5, the ribs 48 are provided on each of the upper wall portions 47. The ribs 48 project downward from the upper wall 47. The ribs 48 extend in the radial direction. The radially outer end of the rib 48 is connected to the second outer wall 42 a. The rib 48 contacts the neutral point bus bar 70. More specifically, the lower end of the rib 48 is in contact with the top surface of the neutral point bus bar 70 which will be described later.

Each of the pair of circumferential wall portions 46 is provided at an end portion on both sides in the circumferential direction of the first lower wall portion 44 a. The pair of circumferential wall portions 46 has a plate shape that protrudes upward from the first lower wall portion 44 a. Each of the pair of circumferential wall portions 46 has a first circumferential wall portion 46 a and a second circumferential wall portion 46 b. That is, the support member 40 has a pair of first circumferential wall portions 46 a. The pair of first circumferential wall portions 46a sandwich a main body portion 71, which will be described later, of the neutral point bus bar 70 in the circumferential direction. In the present embodiment, the first circumferential wall 46 a corresponds to a fourth wall.

The first circumferential wall 46 a extends from the radially inner surface of the second outer wall 42 a to the radially inner end of the first lower wall 44 a. The pair of first circumferential wall portions 46 a are inclined wall portions extending in the direction approaching the circumferential direction from the inner side in the radial direction toward the outer side in the radial direction. The circumferential distance between the pair of first circumferential wall portions 46 a decreases as it goes from the radially inner side to the radially outer side.

The second circumferential wall 46b extends in the circumferential direction away from the other circumferential wall 46 from the radially inner end of the first circumferential wall 46a and is connected to the side wall 41c. The radially inner surface of the second circumferential wall 46b is disposed at the same position in the radial direction as the radially inner side surface of the first lower wall 44a, and on the upper side of the radially inner surface of the first lower wall 44a. It is connected continuously.

The pair of

protrusions

45 a and 45 b protrude radially inward from the lower wall 44. In more detail, a pair of

protrusion part

45a, 45b protrudes radially inward from the 2nd lower wall part 44b. The protrusion 45 a has a protrusion 45 c at the radially inner end, which protrudes toward the protrusion 45 b in the circumferential direction. The protrusion 45 b has a protrusion 45 d at the radially inner end, which protrudes toward the protrusion 45 a in the circumferential direction.

A coil lead-out wire 37 is passed between the pair of

protrusions

45 a and 45 b in the circumferential direction. The coil leader line 37 extends upward from at least one of the plurality of coils 35. The coil lead-out wire 37 is an end of a conducting wire that constitutes the coil 35. In the present embodiment, the coil leader 37 extends upward from each of the six coils 35. The coil 35 in which the coil leader 37 extends is different from the coil 35 in which the coil leader 36 extends. In the present embodiment, the coil leader 37 corresponds to a first lead.

The pair of

protrusions

45a and 45b sandwich the coil lead-out wire 37 in the circumferential direction. The radially inner end of the pair of

protrusions

45 a and 45 b is positioned radially inward of the coil lead wire 37. The

convex portions

45 c and 45 d are located radially inward of the coil lead wire 37. The circumferential distance between the

convex portions

45 c and 45 d in the pair of projecting

portions

45 a and 45 b is smaller than the wire diameter of the coil lead wire 37. That is, the gap in the circumferential direction between the pair of projecting

portions

45 a and 45 b has a portion in which the dimension in the circumferential direction is smaller than the wire diameter of the coil lead wire 37 inside the coil lead wire 37 in the radial direction. Accordingly, it is possible to suppress that the coil lead-out wire 37 is pulled out inward in the radial direction from the gap in the circumferential direction between the pair of protruding

portions

45a and 45b. A plurality of pairs of protruding

portions

45a and 45b are provided along the circumferential direction. In the present embodiment, for example, three pairs of the protruding

portions

45 a and 45 b are provided.

As shown in FIG. 3, the plurality of leg portions 49 have a plate shape extending downward from the first outer wall portion 41 a of the coil support portion 41 or the second outer wall portion 42 a of the bus bar holding portion 42. For example, three legs 49 of this embodiment are provided. As shown in FIG. 1, the lower end of the leg 49 is in contact with the top surface of the core back 32. Thus, the support member 40 is supported by the stator core 31 from the lower side.

As shown in FIG. 4, in the present embodiment, two neutral point bus bars 70 are provided. The two neutral point bus bars 70 are supported by the support member 40. More specifically, the two neutral point bus bars 70 are respectively held by the two bus bar holding portions 42. As shown in FIG. 5, the neutral point bus bar 70 has a main body portion 71 and a grip portion 72. The main body 71 extends in the circumferential direction. The main body portion 71 has a plate shape whose plate surface is orthogonal to the axial direction. The main body portion 71 is disposed on the upper surface of the first lower wall portion 44a. That is, the first lower wall portion 44a supports the neutral point bus bar 70 from the lower side.

The radially outer edge portion of the main body portion 71 contacts the radially inner side surface of the second outer wall portion 42 a. Thereby, the second outer wall portion 42a supports the neutral point bus bar 70 from the radially outer side. A part of the main body 71 is disposed between the first lower wall 44 a and the upper wall 47 in the axial direction. That is, the upper wall portion 47 is disposed on the upper side of the neutral point bus bar 70. The radial dimension of the main body portion 71 is smaller than the radial dimension of the first lower wall portion 44a. The rib 48 is in contact with the upper surface of the main body 71. The end portions on both sides in the circumferential direction of the main body portion 71 are inclined portions positioned in a direction in which they approach each other as it goes from the radially inner side to the radially outer side, and contact with the pair of first circumferential wall portions 46a.

The grip portion 72 protrudes radially inward from the main body portion 71. That is, neutral point bus bar 70 has gripping portion 72 at the radially inner edge portion of neutral point bus bar 70. The gripping portion 72 has a base portion 72a, a pair of

arm portions

72b and 72c, and a projecting wall portion 72d. The base portion 72 a protrudes radially inward from the radially inner edge portion of the main body portion 71. The pair of

arms

72b and 72c extend radially inward from the base 72a. The arm 72b and the arm 72c face each other in the circumferential direction with a gap. The arm 72 b is disposed on the upper side of the protrusion 45 a. The arm 72c is disposed on the upper side of the protrusion 45b. A gap in the circumferential direction between the arm 72 b and the arm 72 c overlaps with a gap in the circumferential direction between the pair of

protrusions

45 a and 45 b as viewed in the axial direction.

As shown in FIG. 4, the arm 72 c has a wave shape as viewed in the axial direction. The upper end portion of the coil lead-out wire 37 is inserted inside the grip portion 72, that is, between the arm portion 72b and the radial direction of the arm portion 72c. The base portion 72a and the pair of

arm portions

72b and 72c have a plate shape whose plate surfaces are orthogonal to each other in the axial direction, and are continuously connected. The projecting wall 72d is provided across the base 72a and the pair of

arms

72b and 72c. The projecting wall 72d protrudes upward from the base 72a and the pair of

arms

72b and 72c.

Although illustration is omitted, the tip end portions of the pair of

arm portions

72b and 72c are crimped from both sides in the circumferential direction to sandwich the coil lead-out wire 37 from both sides in the circumferential direction. Thus, the gripping portion 72 grips the coil leader 37. The holding portion 72 and the coil leader 37 are fixed to each other by welding, for example. Thus, the coil lead-out wire 37 is connected to the neutral point bus bar 70, and the neutral point bus bar 70 is electrically connected to the coil 35. In the present embodiment, three gripping portions 72 are provided for each neutral point bus bar 70. That is, each neutral point bus bar 70 is connected to the three coils 35. Thereby, the neutral point bus bar 70 connects two or more coils 35 of the plurality of coils 35 as a neutral point.

The radially inner edge portion of neutral point bus bar 70 is exposed radially inward of support member 40. Therefore, the neutral point bus bar 70 is moved radially outward from the radial inside of the support member 40, and the neutral point bus bar 70 is inserted between the lower wall portion 44 and the upper wall portion 47 in the axial direction. Can. The lower wall portion 44 and the upper wall portion 47 restrict the axial movement of the inserted neutral point bus bar 70. Therefore, the neutral point bus bar 70 can be prevented from moving in the axial direction and coming off from the support member 40.

In addition, the second outer wall portion 42 a is disposed radially outside the neutral point bus bar 70. Therefore, it can suppress that neutral point bus bar 70 moves to the diameter direction outside. The neutral point bus bar 70 also has a gripping portion 72 that grips the coil leader 37 at the radially inner edge portion. Therefore, the coil leader line 37 can suppress the neutral point bus bar 70 from moving radially inward. Thus, neutral point bus bar 70 can be prevented from moving in the radial direction and disengaging from support member 40. As described above, the neutral point bus bar 70 can be prevented from moving in the axial or radial direction and disengaging from the support member 40, and the neutral point bus bar 70 can be stably held on the support member 40.

For example, when the support member is provided with a groove that opens upward, and the neutral point bus bar is inserted from the upper side into the groove and held, the neutral point bus bar and the groove size do not match precisely. There is a problem that the point bus bar is easily pulled upward from the groove. Therefore, it is necessary to make the support member and the neutral point bus bar accurately, and there is a problem that the manufacturing cost of the motor increases. In addition, even when the dimension of the neutral point bus bar and the dimension of the groove are accurately matched, there is a possibility that the neutral point bus bar may come out of the groove upward.

On the other hand, according to the present embodiment, the neutral point bus bar 70 is moved from the radially inner side to the radial direction outer side, and the neutral point bus bar 70 is inserted between the upper wall portion 47 and the lower wall portion 44 If it contains, it can suppress that neutral point bus bar 70 slips out in the direction of an axis. In addition, the radial inward movement of the neutral point bus bar 70 can be suppressed by using the coil lead-out wire 37 connected to the neutral point bus bar 70. Therefore, even if the dimension of the gap between the upper wall 47 and the lower wall 44 and the dimension in the axial direction of the neutral point bus bar 70 do not match precisely, the gap between the upper wall 47 and the lower wall 44 is It is possible to suppress the radial movement of the point bus bar 70 inward in the radial direction. Thereby, motor 10 having a structure capable of stably supporting neutral point bus bar 70 by support member 40 and suppressing an increase in manufacturing cost is obtained.

In the case where the support member has a recess opening radially inward as in the present embodiment, a configuration will be considered in which the neutral point bus bar is inserted into the support member from the outside in the radial direction. In this case, it is necessary to hold each of the coil lead wire inserted in the recess and the coil lead wire gripped by the grip portion of the neutral point bus bar from different sides in the radial direction. Therefore, it may take time to assemble the motor. In this case, it is difficult to form the support member as a simple annular shape, and the shape of the support member is likely to be complicated. Therefore, the manufacturing cost of the support member may increase.

On the other hand, according to the present embodiment, since the neutral point bus bar 70 is inserted into the support member 40 from the inner side in the radial direction, the coil lead wire 36 and the coil lead wire 37 are recessed from the same side in the radial direction. 43 a and the gripping portion 72 can be held respectively. Thereby, the assembly of the motor 10 can be facilitated. Moreover, the shape of the support member 40 can be easily made into a simple annular shape, and an increase in the manufacturing cost of the support member 40 can be suppressed.

Further, according to the present embodiment, the grip portion 72 has a pair of

arm portions

72b and 72c extending inward in the radial direction from the base portion 72a. Therefore, the coil lead-out wire 37 can be easily held by the grip portion 72 by inserting the coil lead-out wire 37 from the inner side in the radial direction between the pair of

arm portions

72 b and 72 c in the circumferential direction.

Further, according to the present embodiment, the support member 40 includes the pair of first circumferential wall portions 46 a sandwiching the main body portion 71 in the circumferential direction. Therefore, neutral point bus bar 70 can be positioned in the circumferential direction, and neutral point bus bar 70 can be prevented from moving in the circumferential direction and coming off support member 40. Therefore, neutral point bus bar 70 can be more stably held by support member 40.

Further, according to the present embodiment, the pair of first circumferential wall portions 46 a are inclined wall portions extending in the direction approaching the circumferential direction from the inner side in the radial direction toward the outer side in the radial direction. Further, the end portions on both sides in the circumferential direction of the main body portion 71 are inclined portions positioned in a direction in which they approach each other as they go from the radially inner side to the radially outer side. Therefore, even if there is an error in the circumferential distance between the pair of first circumferential wall portions 46a and the circumferential dimension of the main body portion 71, the radial position of the main body portion 71 is adjusted. Thus, the error can be absorbed, and the end portions on both sides in the circumferential direction of the main body 71 can be brought into contact with the pair of first circumferential wall portions 46a. Thereby, it can suppress that the circumferential direction position of the main-body part 71 shifts | deviates, and the neutral point bus-bar 70 can be hold | maintained by the supporting member 40 more stably.

Further, according to the present embodiment, as described above, it is possible to suppress the coil leader line 37 from being pulled radially inward from between the circumferential direction of the pair of protruding

portions

45 a and 45 b. Therefore, the radial direction position of the coil lead-out wire 37 can be stabilized by a pair of

protrusion part

45a, 45b. Thereby, when connecting coil lead-out wire 37 with grasping part 72, it can control that coil lead-out wire 37 moves to a diameter direction inner side, and coil lead-out wire 37 slips out between a pair of

arm parts

72b and 72c. Can be suppressed. Therefore, the coil lead-out wire 37 and the grip portion 72 can be stably connected.

Further, according to the present embodiment, the support member 40 has the rib 48 that protrudes downward from the upper wall portion 47 and contacts the neutral point bus bar 70. Therefore, axial movement of neutral point bus bar 70 can be further suppressed, and neutral point bus bar 70 can be more stably held by support member 40.

As shown in FIG. 1, the bus bar holder 60 is disposed on the upper side of the bearing holder 50. The bus bar holder 60 is made of resin. The bus bar holder 60 has an annular portion 61, a cylindrical portion 62, an extension portion 63, and a connector portion 64. The annular portion 61 is an annular shape that surrounds the radially outer side of the shaft 21 above the bearing holder 50. The cylindrical portion 62 has a cylindrical shape extending downward from the radially inner edge portion of the annular portion 61. The cylindrical portion 62 is cylindrical around the central axis J. The lower end portion of the cylindrical portion 62 is fitted to the inside in the radial direction of the lid portion 53b.

The extending portion 63 extends radially outward from the annular portion 61. For example, a plurality of extending portions 63 are provided along the circumferential direction. The connector portion 64 has a tubular shape that protrudes upward from the annular portion 61. The connector portion 64 opens upward. A part of the phase bus bar 80 is exposed inside the connector portion 64. The connector portion 64 is connected to an external power supply for supplying power to the stator 30.

Phase bus bar 80 is embedded in and held by bus bar holder 60. As shown in FIG. 6, the phase bus bar 80 has an extending portion 81 and a gripping portion 82. The extension portion 81 is in the form of a plate extending along a plane orthogonal to the axial direction. The plate surface of the extending portion 81 is orthogonal to the axial direction. One end of the extending portion 81 is held by the extending portion 63. The upper surface of the extending portion 81 held by the extending portion 63 is exposed to the outside of the bus bar holder 60. Although not shown, the other end of the extension portion 81 is exposed to the inside of the connector portion 64.

The gripping portion 82 is connected to one end of the extending portion 81. The gripping portion 82 is disposed at a position overlapping the holder through hole 51 a and the wire holding portion 43 as viewed in the axial direction. The grip portion 82 is a plate that is bent in a substantially U shape that opens radially outward when viewed in the axial direction. The plate surface of the grip portion 82 is parallel to the axial direction.

The grip 82 has a base 82a and a pair of

arms

82b and 82c. The pair of

arms

82 b and 82 c extend radially outward from the base 82 a. The arm 82 b is connected to the extending portion 81. The arm 82 b and the arm 82 c oppose each other in the circumferential direction with a gap. A gap in the circumferential direction between the arm 82 b and the arm 82 c is viewed in the axial direction and overlaps the inside of the recess 43 a. The upper end of the coil lead-out wire 36 is inserted into the inside of the grip 82, that is, between the arm 82b and the arm 82c in the radial direction.

Although illustration is omitted, the tip end portions of the pair of

arm portions

82b and 82c are crimped from both sides in the circumferential direction to sandwich the coil lead-out wire 36 from both sides in the circumferential direction. Thus, the gripping portion 82 grips the coil leader 36. The grip portion 82 and the coil leader 36 are fixed to each other by welding, for example. Thus, the coil lead wire 36 is connected to the phase bus bar 80, and the phase bus bar 80 is electrically connected to the coil 35.

As described above, since the pair of

arms

82b and 82c extend radially outward from the base 82a, the base 82a is disposed radially inward of the coil leader 36 sandwiched between the pair of

arms

82b and 82c. Thus, the radially inward movement of the coil lead-out wire 36 is suppressed by the base portion 82a. Therefore, even if the coil lead-out wire 36 is detached from the recess 43 a, the base 82 a can suppress the radial movement of the coil lead-out wire 36. Thus, the contact of the coil lead-out wire 36 with the inner side surface of the holder through hole 51a can be further suppressed, and the coil lead-out wire 36 can be more stably insulated from the bearing holder 50.

Further, for example, when the pair of

arm portions

82b and 82c extend inward in the radial direction from the base portion 82a, the base portion 82a is disposed radially outside the coil lead wire 36, and the phase bus bar 80 tends to be enlarged in the radial direction. On the other hand, according to the present embodiment, the pair of

arm portions

82b and 82c extend radially outward from the base portion 82a. Therefore, it is possible to suppress the diametrical increase in size of phase bus bar 80. Thereby, the motor 10 can be miniaturized in the radial direction while suppressing the movement of the coil lead-out wire 36 to the side where the recess 43a is opened by the base 82a.

The phase bus bar 80 is connected to an external power supply that supplies power to the stator 30 via the connector portion 64. More specifically, the other end of the extension portion 81 exposed to the inside of the connector portion 64 is connected to the external power supply. Thus, power is supplied to the stator 30 from the external power supply via the phase bus bar 80.

According to the present embodiment, the neutral point bus bar 70 can be held by the support member 40 in which the coil leader 36 is held. Therefore, the neutral point bus bar 70 does not have to be held by the bus bar holder 60 disposed on the upper side of the bearing holder 50, and the bus bar holder 60 can be easily miniaturized in the radial direction. Therefore, the motor 10 can be easily miniaturized in the radial direction.

The present invention is not limited to the above-described embodiment, and the following other configurations can be adopted. The recess may open radially outward, and may be disposed radially inward of the radial center of the holder through hole. The conductor holding portion may not be inserted into the holder through hole. Only one second wall portion may be provided for one bus bar holding portion. The second wall may have a shape extending in the circumferential direction. The fourth wall may not be provided. The supported bus bar may be a phase bus bar. The rib may protrude upward from the lower wall portion to contact the supported bus bar.

In addition, the application of the motor of embodiment mentioned above is not specifically limited. Moreover, each structure demonstrated above can be combined suitably in the range which does not contradiction mutually.

Reference Signs List 10 motor 20 rotor 21 shaft 30 stator 35 coil coil 36 coil lead (second wire) 37 coil lead (first wire) 40 support member 42 a 2 outer wall portion (third wall portion), 43a ... recessed portion 44 ... lower wall portion (first wall portion) 44c ... wall portion through

hole

45a, 45b ... projecting portion 46a ... first circumferential wall portion (first 4 wall parts) 47 upper wall part (second wall part) 48 rib 70 neutral point bus bar supported bus bar 71 main part 72 grip part 72a base 72b, 72c ... Arm, J ... Central axis

Claims

A rotor having a shaft disposed along a central axis,

A stator having a plurality of coils and facing the radially outer side of the rotor via a gap;

A support member disposed on one side in the axial direction of the stator;

A supported bus bar connected to a first lead wire extending in one axial direction from at least one of the plurality of coils and supported by the support member;

The support member is

A first wall supporting the supported bus bar from the other side in the axial direction;

A second wall portion disposed on one side in the axial direction of the supported bus bar;

A third wall disposed radially outward of the supported bus bar;

Have

The radially inner edge portion of the supported bus bar is exposed radially inward of the support member,

The motor according to the present invention, wherein the supported bus bar has a gripping portion for gripping the first wire at a radially inner edge portion of the supported bus bar.
The supported bus bar is

Body part,

And the gripping portion protruding radially inward from the main body portion,

The gripping portion is

The base,

A pair of arms extending radially inward from the base and facing each other with a gap in the circumferential direction;

The motor according to claim 1, wherein the pair of arm portions clamps the first wire from both sides in the circumferential direction.
The supported bus bar has a body extending in the circumferential direction,

The motor according to claim 1, wherein the support member has a pair of fourth wall portions sandwiching the main body portion in the circumferential direction.
The pair of fourth wall portions are inclined wall portions extending in a direction approaching each other in the circumferential direction as going radially inward from the radially inner side,

The main body portion has a plate shape whose plate surface is orthogonal to the axial direction,

The end portions on both sides in the circumferential direction of the main body portion are inclined portions positioned so as to approach each other as they go from the radially inner side to the radially outer side, and contact the pair of fourth wall portions Motor described.
The second wall projects radially inward from the third wall;

The first wall portion has a wall portion through hole axially penetrating the first wall portion at a position overlapping with the second wall portion as viewed in the axial direction. The motor according to one of the items.
The support member has a pair of projecting portions that project radially inward from the first wall portion and sandwich the first conductive wire in the circumferential direction.

The radially inner end of the pair of protrusions is positioned radially inward of the first conductive wire,

The clearance between the pair of projections in the circumferential direction has a portion in which the dimension in the circumferential direction is smaller than the diameter of the first conducting wire inward of the first conducting wire in the radial direction. The motor according to any one of the items.
The support member has a recess that is recessed outward in the radial direction and that opens in the radial direction.

The inside of the recess is open on both sides in the axial direction,

The motor according to any one of claims 1 to 6, wherein a second conducting wire extending in an axial direction from at least one of the plurality of coils is fitted and held in the recess.
The motor according to any one of claims 1 to 7, wherein the support member includes a rib protruding from the second wall portion to the other side in the axial direction and in contact with the supported bus bar.