Busbar guide, busbar assembly using the same, and motor

Abstract

A bus bar guide is provided to fix a bus bar for connecting between a plurality of coils provided in a motor. The bus bar includes a plate-shaped conductor having a first surface and a second surface continuous to the first surface. The bus bar guide is configured by annularly arranging a plurality of bus bar guide pieces each made of an insulator. The plurality of bus bar guide pieces are each provided with a groove portion for holding the first surface of the bus bar and positioning the bus bar.

Description

[Technical field]

[0001] The present invention relates to a busbar guide, and a busbar assembly and a motor using the busbar guide. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a configuration in which a plate-shaped bus bar is used to connect a plurality of coils provided in a motor is widely known.

[0003] For example, Patent Document 1 discloses a configuration in which a plurality of grooves are provided in an annular insulator provided on the upper part of a stator core, and bus bars are fitted and held in the grooves. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-090404 A Summary of the Invention

[0005] However, in the conventional configuration disclosed in Patent Document 1, the insulator that holds the busbar is integrally formed as a single component. This makes it difficult to accommodate the variations in the shapes of the busbars or the variations in the terminal positions of the coils and to position each component in a predetermined position. In addition, the variations in the shape of the insulator itself can cause misalignment of the components, making it difficult to reliably connect the coils.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a bus bar guide that can absorb variations in the shape and arrangement of each component and reliably connect coils together, and a bus bar assembly and a motor that use the same.

[0007] In order to achieve the above-mentioned object, the busbar guide of the present invention is a busbar guide for fixing a busbar connecting multiple coils provided in a motor, wherein the busbar includes a plate-shaped conductor having a pair of first surfaces extending radially and facing each other, and a pair of second surfaces extending axially continuous with the first surfaces and facing each other, and the busbar guide is configured by arranging a plurality of busbar guide pieces each made of an insulator in a ring shape, and each of the plurality of busbar guide pieces is provided with a groove portion for holding the first surface of the busbar and positioning the busbar.

[0008] A busbar assembly according to the present invention includes at least the busbar guide, and a plurality of busbars respectively arranged in a plurality of grooves provided on an upper surface of the busbar guide.

[0009] The motor of the present invention comprises at least a rotor having an output shaft at its axis, a stator arranged at a predetermined distance from the rotor, and the busbar assembly attached to the upper part of the stator, wherein the stator has at least an annular yoke, a plurality of teeth connected to the inner circumference of the yoke at a predetermined distance, and a plurality of coils attached to each of the plurality of teeth, and two of the plurality of coils are electrically connected via one of the plurality of busbars.

[0010] According to the busbar guide of the present invention, the variation in shape of the busbars can be absorbed, and the busbars can be easily arranged in the busbar guide. According to the busbar assembly of the present invention, the variation in shape of the busbars can be absorbed, and multiple busbars can be easily arranged in the busbar guide. According to the motor of the present invention, multiple busbars can be easily installed in the busbar guide. Furthermore, because the multiple busbars are positioned and arranged in the busbar guide, the assembly process of the motor is simplified, and assembly costs can be reduced. [Brief description of the drawings]

[0011] [Figure 1]FIG. 2 is a top view of the motor according to the embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. [Figure 4A] 13 is a top view of the bus bar guide when a bus bar is placed in a groove portion. FIG. [Figure 4B] FIG. 4B is a perspective view of the bus bar guide shown in FIG. 4A. [Figure 5A] FIG. [Figure 5B] FIG. 5B is a schematic cross-sectional view taken along line VB-VB in FIG. 5A. [Figure 5C] FIG. 5B is an enlarged view of an end of the bus bar shown in FIG. 5A. [Figure 6A] FIG. [Figure 6B] FIG. 6B is a schematic cross-sectional view taken along line VIB-VIB in FIG. 6A. [Figure 7A] FIG. [Figure 7B] FIG. 4 is a schematic diagram of the vicinity of a gap as viewed from a radial direction. [Figure 8A] FIG. 11 is a perspective view of a bus bar according to Modification 1. [Figure 8B] 13 is an enlarged schematic view of a connection portion between a bus bar and a lead portion according to Modification 1. FIG. [Figure 9] FIG. 11 is a top view of a bus bar according to Modification 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following preferred embodiments are merely illustrative in nature and are not intended to limit the present invention, its applications, or its uses.

[0013] (Embodiment) [Motor configuration] FIG. 1 is a top view of a motor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. In the following description, the radial direction of the motor 1000 may be referred to as the "radial direction", the outer circumferential direction as the "circumferential direction", and the axial direction of the output shaft 210 of the motor 1000 (perpendicular to the paper surface in FIG. 1) as the "axial direction". In the radial direction, the axial center side of the motor 1000 may be referred to as the radially inner side, and the outer circumferential side as the radially outer side. The outer circumferential direction of the motor 1000 is the same as the outer circumferential direction of the bus bar guide 60 described later. Therefore, the outer circumferential direction of the bus bar guide 60 may also be referred to as the "circumferential direction". Similarly, the radial direction of the motor 1000 is the same as the radial direction of the bus bar guide 60. Therefore, the radial direction of the bus bar guide 60 may also be referred to as the "circumferential direction". In the motor 1000, the side on which the bus bar guide 60 is provided may be referred to as the upper side, and the opposite side along the axial direction may be referred to as the lower side. 2, the lead portion 41 of the coil 40 is omitted. When viewed in the axial direction, the axis of the motor 1000 coincides with the axis of the output shaft 210.

[0014] The motor 1000 has a stator 100, a rotor 200, and a motor case 400. The motor 1000 also has other components, such as a bearing that supports an output shaft, etc. However, for the sake of convenience, illustration and description of these components will be omitted.

[0015] The stator 100 has an annular yoke 20, a plurality of teeth 10, slots 30, and coils 40. The plurality of teeth 10 are connected to the inner circumference of the yoke 20 and are provided at equal intervals along the inner circumference. The slots 30 are provided between the teeth 10 adjacent to each other in the circumferential direction. The coils 40 are housed in the slots 30. The stator 100 is disposed radially outward from the rotor 200 at a fixed interval from the rotor 200.

[0016] The teeth 10 and the yoke 20 are each formed, for example, by laminating electromagnetic steel sheets containing silicon or the like and then punching them. The coil 40 is a component formed by spirally winding a conductor wire made of copper or the like and having a rectangular cross section. The coil 40 has lead portions 41 at both ends. The coil 40 is attached to each of the multiple teeth 10 with an insulator (not shown) sandwiched therebetween and housed in the slot 30. Although not shown, an insulating coating is formed on the surface of the conductor wire that constitutes the coil 40. A bus bar 50 is connected to the tip of each of the lead portions 41 by welding or the like.

[0017] In this embodiment, the coils 40 may be referred to as coils U1 to U4, V1 to V4, and W1 to W4, respectively, depending on the phase of the current flowing through the coils 40.

[0018] The busbar assembly 300 includes a busbar guide 60 and a plurality of busbars 50. The busbar guide 60 is configured by arranging a plurality of busbar guide pieces 60a-60k in the circumferential direction (see FIG. 3). The busbar guide pieces 60a-60k are each formed by molding a thermoplastic insulating resin. However, a thermosetting resin may also be used. The shape and function of the busbar guide 60 will be described in detail later.

[0019] The busbar 50 is formed by bending a conductor made of copper or the like into a predetermined shape. An insulating coating (not shown) is formed on the surface of the busbar 50. However, the insulating coating is removed from the connection portion with the lead portion 41 of the coil 40. The busbar 50 functions as wiring for electrically connecting the coils 40 spaced apart in the circumferential direction. For example, the coils U1 to U4 are connected in series via the multiple busbars 50. The shape of the busbar 50 will be described later.

[0020] The rotor 200 includes an output shaft 210, a rotor core 220 having the output shaft 210 at its axis, and is embedded inside the rotor core 220. The rotor 200 has a plurality of magnets 230 in which north and south poles are alternately arranged along the outer circumferential direction of the output shaft facing the stator 100. The material, shape, and composition of the magnets 230 may be appropriately changed depending on the output of the motor 1000, etc. The rotor core 220 is formed, for example, by laminating electromagnetic steel sheets containing silicon or the like and then punching them out.

[0021] The motor case 400 is a cylindrical metal part with a bottom. The motor case 400 houses the stator 100 and the rotor 200 inside. If the motor case 400 is made of a magnetic material such as iron, it may function as a yoke that forms a magnetic path. In that case, the yoke 20 may be omitted.

[0022] The coils U1 to U4, V1 to V4, and W1 to W4 are connected in series. Three-phase currents of U, V, and W phases, which have a phase difference of 120° electrical angle from each other, are supplied to the coils U1 to U4, V1 to V4, and W1 to W4, respectively, to excite them. This generates a rotating magnetic field in the stator 100. An interaction occurs between this rotating magnetic field and a magnetic field generated by the magnet 230 provided in the rotor 200, generating torque. As a result, the output shaft 210 rotates while being supported by a bearing (not shown).

[0023] [Busbar guide and busbar configuration] Fig. 3 is a top view of the busbar guide. Fig. 4A is a top view of the busbar guide when a busbar is disposed in a groove. Fig. 4B is a perspective view of the busbar guide of Fig. 4A. For ease of explanation, Figs. 4A and 4B show only one busbar 50.

[0024] FIG. 5A is a top view of a busbar. FIG. 5B is a schematic cross-sectional view taken along line VB-VB in FIG. 5A. FIG. 5C is an enlarged view of the end of the busbar shown in FIG. 5A. FIG. 6A is an enlarged top view of a groove. FIG. 6B is a schematic cross-sectional view taken along line VIB-VIB in FIG. 6A. FIG. 7A is an enlarged top view of a gap. FIG. 7B is a schematic view of the vicinity of the gap as viewed from the radial direction. Note that FIG. 7B is a schematic view as viewed from the direction of the arrow shown in FIG. 7A.

[0025] 5A and 5C also show lead portions 41 of coil 40. Busbar 50 is omitted from Figures 7A and 7B. In busbar guide 60, the surface on which busbar 50 is arranged is sometimes referred to as the upper surface of busbar guide 60, and the opposite surface is sometimes referred to as the lower surface of busbar guide 60.

[0026] As shown in FIG. 3, the busbar guide 60 is configured by eleven busbar guide pieces 60a to 60k arranged in the circumferential direction. Adjacent busbar guide pieces 60a and 60b are fitted and connected to each other at a fitting portion 64a. Adjacent busbar guide pieces 60c and 60d are fitted and connected to each other at a fitting portion 64b. Adjacent three busbar guide pieces 60d to 60f are fitted and connected to each other at a fitting portion 64c. Adjacent three busbar guide pieces 60g to 60i are fitted and connected to each other at a fitting portion 64c. Adjacent busbar guide pieces 60j and 60k are fitted and connected to each other at a fitting portion 64c. In the following description, the fitting portions 64a to 64c may be collectively referred to as a fitting portion 64.

[0027] Meanwhile, busbar guide pieces 60a and 60c, and 60b and 60c are separated by gap 63a with a gap therebetween. Busbar guide pieces 60f and 60g are separated by gap 63b with a gap therebetween. Busbar guide pieces 60i and 60j are separated by gap 63c with a gap therebetween. Busbar guide pieces 60k and 60a are separated by gap 63d with a gap therebetween. In other words, the busbar guide 60 is divided into a plurality of pieces in the circumferential direction by gaps 63a to 63d.

[0028] 3, the fitting portions 64c each have the same shape. The fitting portions 64a, 64b have different shapes from each other and from the fitting portion 64c.

[0029] Each of the busbar guide pieces 60a to 60k has a through hole 62 and a groove 61. The groove 61 is formed in one busbar guide piece or across multiple busbar guide pieces. As shown in FIG. 3, the groove 61 formed in only one of the busbar guide pieces 60j, 60k, 60a accommodates the busbar 50 connected to a connection line to an external power source. The lead portion 41 of the coil 40 passes through the through hole 62 and is drawn out to the upper part of the busbar guide 60. In this way, the lead portion 41 of the coil 40 is connected to each of the ends 50a of the busbar 50. As shown in FIGS. 4A and 4B, the groove 61 is formed on the upper surface of the busbar guide 60, and both ends 50a of the busbar 50 are fitted into the groove 61 in a bent state.

[0030] Both end portions 50a of the busbar 50 are folded back in the same circumferential direction so that the tips are positioned radially inward. The groove portion 61 also has a curved portion 61a curved in a hairpin shape so as to accommodate the folded back end portion 50a of the busbar 50. The curved portion 61a is disposed so as to surround the through hole 62 in a top view.

[0031] 5A and 5C, with the busbar assembly 300 attached to the stator 100, the lead portions 41 are sandwiched between both ends 50a of the busbar 50. The lead portions 41 and the busbar 50 are joined to each other by welding or fusing (thermal crimping), etc. In this manner, the busbar 50 is fitted into each of the multiple grooves 61, whereby the through holes 62 and the busbar 50 are positioned in accordance with the positions of the lead portions 41.

[0032] 5B, busbar 50 has a pair of first surfaces 51 that extend in the radial direction and face each other, and a pair of second surfaces 52 that extend in the axial direction and face each other. First surface 51 is continuous with second surface 52 and forms a substantially right angle with second surface 52. Busbar 50 is shaped so that width w2 of second surface 52 is wider than width w1 of first surface 51. Busbar 50 is fitted into groove 61 so that first surface 51 abuts against the bottom surface of groove 61 (see FIGS. 4A and 4B).

[0033] As shown in Figures 6A and 6B, when the depth of groove portion 61 is d1 and the width is w3, the relationship shown in the following formulas (1) and (2) holds between the aforementioned widths w1 and w2 and these depths d1 and w3.

[0034] d1≦0.5×w2 (1) w1 <w3≦2×w1 ···(2) As shown in FIG. 1, when the busbar guide 60 is attached to the top of the stator 100, the temperature detection sensors 70 are disposed inside the gaps 63a to 63d as viewed from the axially upper side. The temperature detection sensors 70 detect the temperature of the motor 1000, particularly the coils 40. As shown in FIG. 7A, a wire 71 is connected to the temperature detection sensor 70, and an output signal of the temperature detection sensor 70 is output to a motor control unit (not shown) via the wire 71, and the temperature of the motor 1000, for example, is monitored. When the output signal of the temperature detection sensor 70 is equal to or greater than a predetermined value, the motor control unit notifies the motor control unit of a temperature abnormality. Alternatively, the motor control unit stops the motor 1000 after notifying the abnormality. For example, a thermistor or a thermocouple is used as the temperature detection sensor 70.

[0035] As shown in Fig. 7B, wiring 71 connected to temperature detection sensor 70 located inside gap 63d is partially covered by step 65 provided on the lower surface of bus bar guide 60. As shown in Fig. 3, hole 66 is formed on the radial outside of gap 63c. Hole 66 is provided to allow a string-like member (not shown) to pass through for fixing wiring 71 connected to temperature detection sensor 70 to bus bar guide 60 or bus bar 50 when temperature detection sensor 70 is disposed inside gap 63c.

[0036] [Effects, etc.] As described above, the bus bar guide 60 according to this embodiment is provided to fix the bus bar 50 that connects between the multiple coils 40 provided in the motor 1000. The bus bar 50 includes a plate-shaped conductor having a first surface 51 and a second surface 52 that is continuous with the first surface 51.

[0037] The busbar guide 60 is configured by arranging a plurality of busbar guide pieces 60a-60k, each made of an insulator, in an annular shape. Each of the plurality of busbar guide pieces 60a-60k is provided with a groove portion 61 for holding the first surface 51 of the busbar 50 and for positioning the busbar 50.

[0038] By configuring the busbar guide 60 with multiple busbar guide pieces 60a-60k, it is possible to accommodate variations in the shape of the busbar 50. This makes it possible to easily arrange the busbar 50 in the busbar guide 60. This also makes it possible to accommodate variations in the position of the lead portion 41 of the coil 40. This makes it possible to correctly arrange the busbar 50 in accordance with the position of the lead portion 41. By providing groove portions 61 on the upper surface of the busbar guide 60, it is possible to reliably hold the busbar 50.

[0039] 5B, when width w1 of first surface 51 of busbar 50 is narrower than width w2 of second surface 52, busbar 50 can be arranged in a so-called vertical orientation. This reduces the area required for arranging busbar 50. This increases the degree of freedom in arranging busbar 50.

[0040] As shown in formula (1), it is preferable that the depth d1 of the groove 61 is half the width w2 of the second surface 52 of the bus bar 50 or less.

[0041] In this way, the surface area of ​​the busbar 50 exposed from the groove portion 61 can be increased. As a result, the busbar 50 can be held in the groove portion 61 while a heat dissipation area of ​​the busbar 50 can be secured. This improves the cooling efficiency of the busbar 50 by air and other refrigerants. The busbar 50, through which a large current flows, can be efficiently cooled, thereby preventing a decrease in the efficiency of the motor 1000. In addition, a temperature rise of the coil 40 and the stator 100 can be suppressed, allowing the motor 1000 to be driven stably. The depth d1 needs to be set to a value that prevents the busbar 50 from rattling due to vibration of the motor 1000, etc.

[0042] As shown in formula (2), it is preferable that width w3 of groove portion 61 be greater than width w1 of first surface 51 of busbar 50 and be equal to or smaller than twice width w1.

[0043] This allows bus bar 50 to be easily fitted into groove portion 61, and prevents bus bar 50 from rattling due to vibration of motor 1000, etc.

[0044] The busbar guide 60 is divided into multiple pieces by gaps 63a to 63d. In other words, the busbar 50 has at least one pair of two busbar guide pieces that are adjacent to each other and spaced apart from each other in the circumferential direction.

[0045] By configuring busbar guide 60 in this manner, even if there is a large variation in the position of lead portion 41 or in the shape of busbar 50, these variations can be reliably absorbed. This makes it possible to easily arrange busbar 50 in busbar guide 60. Also, busbar 50 can be arranged correctly in accordance with the position of lead portion 41.

[0046] The busbar guide 60 has a plurality of pairs of adjacent busbar guide pieces, and at least one pair of the busbar guide pieces is formed with a fitting portion 64 for fitting and connecting the busbar guide pieces to each other. For example, three adjacent busbar guide pieces 60d to 60f are fitted together at fitting portion 64c and connected to each other.

[0047] By configuring the busbar guide 60 in this manner, it is possible to ensure the strength of the busbar guide 60 against vibrations and the like. In cases where groove 61 into which one busbar 50 is fitted is formed across multiple busbar guide pieces, these busbar guide pieces can be connected by fitting together at fitting portions 64, thereby reducing misalignment of groove 61. This allows groove 61 to stably hold busbar 50.

[0048] The shape of the fitting portions 64 formed on each of the busbar guide pieces in one set may be the same as the shape of the fitting portions 64 formed on each of the busbar guide pieces in the other set. For example, three adjacent busbar guide pieces 60d-60f are fitted together and connected to each other at fitting portions 64c of the same shape. Similarly, three adjacent busbar guide pieces 60g-60i are also fitted together and connected to each other at fitting portions 64c of the same shape.

[0049] By defining the shape of the fitting portion 64 in this way, it is possible to increase the number of combinations of bus bars 50 that can be connected to each other, thereby increasing the degree of freedom in arranging the bus bar guide 60.

[0050] The shape of the fitting portion 64 formed on each of the busbar guide pieces of one set may be different from the shape of the fitting portion 64 formed on each of the busbar guide pieces of the other set. For example, adjacent busbar guide pieces 60a and 60b are connected by being fitted to each other at fitting portion 64a. On the other hand, adjacent busbar guide pieces 60c and 60d are connected by being fitted to each other at fitting portion 64b having a different shape from fitting portion 64a. Also, adjacent busbar guide pieces 60j and 60k are connected by being fitted to each other at fitting portion 64c having a different shape from both fitting portion 64a and fitting portion 64b.

[0051] By defining the shape of the fitting portion 64 in this way, the multiple bus bar guide pieces 60a-60k can be arranged in predetermined positions without any mistakes, and this makes it possible to easily install the bus bar guide 60 consisting of the multiple bus bar guide pieces 60a-60k.

[0052] The temperature detection sensor 70 is disposed inside at least one of the gaps 63a-63d provided in the bus bar guide 60. In other words, the temperature detection sensor 70 is disposed in the bus bar guide 60 between two bus bar guide pieces that are spaced apart from each other along the circumferential direction.

[0053] In this manner, an area for installing the temperature detection sensor 70 can be secured, and the temperature detection sensor 70 can be held by the bus bar guide 60.

[0054] At least one of the bus bar guide pieces has a step 65 on a lower surface opposite to the upper surface on which the groove portion 61 is formed. A part of the wiring 71 connected to the temperature detection sensor 70 is covered by the step 65.

[0055] In this manner, the wiring 71 can be stably arranged in the stator 100 including the busbar assembly 300. Even if the wiring 71 is pulled, the wiring is not significantly displaced in the portion covered by the step 65. This prevents the temperature detection sensor 70 connected to the wiring 71 from coming out of its predetermined position. This allows the temperatures of the motor 1000 and the coil 40 to be detected correctly.

[0056] In this embodiment, the step 65 is provided on the lower surface of the bus bar guide piece 60a, but a recess may be provided instead. Even in this embodiment, the wiring 71 does not displace significantly, so that the temperature detection sensor 70 connected to the wiring 71 can be prevented from coming off from a predetermined position.

[0057] Further, each of the bus bar guide pieces 60a to 60k is provided with a through hole 62 for allowing the lead portion 41 provided on the coil 40 to pass therethrough.

[0058] In this manner, the coil 40 and the bus bar 50 can be connected via the lead portion 41.

[0059] Additionally, groove portion 61 is also provided with curved portions 61a described above corresponding to the folded portions provided at both ends of busbar 50. Through holes 62 are provided in each of busbar guide pieces 60a-60k in accordance with the positions of curved portions 61a. This allows busbar 50 to be positioned relative to lead portion 41 of coil 40, ensuring a reliable connection between the two.

[0060] The busbar assembly 300 according to this embodiment includes a busbar guide 60 and a plurality of busbars 50 arranged in a plurality of grooves 61 provided on the upper surface of the busbar guide 60, respectively.

[0061] As described above, the busbar guide 60 is configured by arranging multiple busbar guide pieces 60a-60k in an annular shape. Gaps 63a-63d are provided in the circumferential direction of the busbar guide 60. This makes it possible to absorb variations in the shape of the busbars 50. This allows multiple busbars 50 to be easily arranged in the busbar guide 60. By absorbing variations in the position of the lead portions 41 of the coils 40, etc., the multiple busbars 50 can be correctly arranged in accordance with the positions of the lead portions 41 of the multiple coils 40 arranged in the circumferential direction.

[0062] The motor 1000 of this embodiment comprises at least a rotor 200 having an output shaft 210 at its axis, a stator 100 arranged at a predetermined distance from the rotor 200, and a busbar assembly 300 attached to the upper part of the stator 100.

[0063] The stator 100 has at least an annular yoke 20, a plurality of teeth 10 connected at predetermined intervals to the inner circumference of the yoke 20, and a plurality of coils 40 attached to each of the plurality of teeth 10. Two of the plurality of coils 40 are electrically connected via one of a plurality of bus bars 50.

[0064] By configuring the motor 1000 in this manner, two coils 40 that are spaced apart in the circumferential direction can be connected by the bus bar 50. For example, a delta-connected motor or a star-connected motor can be easily realized.

[0065] Multiple bus bars 50 can be easily installed in the bus bar guide 60. Because multiple bus bars 50 are positioned and arranged in the bus bar guide 60, the work of connecting the bus bars 50 to the coils is facilitated. As a result, the assembly process of the stator 100, and therefore the motor 1000, is simplified, and the assembly cost can be reduced.

[0066] The multiple bus bars 50 are respectively arranged in multiple grooves 61 provided on the upper surface of a bus bar guide 60. The coil 40 has a lead portion 41 for connecting to the bus bar 50. The lead portion 41 passes through a through hole 62 provided in the bus bar guide 60 and is drawn out to the upper part of the bus bar guide 60. The lead portion 41 is electrically connected to the bus bar 50.

[0067] In this manner, the busbar 50 is reliably insulated from the portions of the coil 40 other than the lead portions 41 by the busbar guide 60. Furthermore, the grooves 61 and the through holes 62 are formed in the busbar guide 60 in a pre-positioned state, so that the busbar 50 and the lead portions 41 of the coil 40 can be connected in a pre-positioned state.

[0068] Both end portions 50a of the bus bar 50 are folded back. With the lead portion 41 held between the end portions 50a of the bus bar 50, the lead portion 41 and the bus bar 50 are electrically connected.

[0069] By configuring the bus bar 50 in this manner, the contact area between the bus bar 50 and the lead portion 41 can be increased. This makes it possible to suppress an increase in electrical resistance between the bus bar 50 and the coil 40. In addition, the mechanical strength of the connection between the bus bar 50 and the lead portion 41 can be increased. This improves the reliability of the motor 1000 during long-term use.

[0070] As described above, the busbar guide 60 of this embodiment is a busbar guide 60 for fixing the busbar 50 that connects between multiple coils 40 provided in the motor 1000, and the busbar 50 includes a plate-shaped conductor having a pair of first surfaces 51 that extend radially and face each other, and a pair of second surfaces 52 that extend axially and face each other and are continuous with the first surfaces 51, and the busbar guide 60 is configured by arranging a plurality of busbar guide pieces 60a-60k, each made of an insulator, in a ring shape, and each of the plurality of busbar guide pieces 60a-60k is provided with a groove portion 61 for holding the first surface 51 of the busbar 50 and positioning the busbar 50.

[0071] This allows the variation in shape of the busbar 50 to be absorbed, making it easy to arrange the busbar 50 in the busbar guide 60.

[0072] Furthermore, at least one pair of two bus bar guide pieces 60a, 60b adjacent to each other and arranged at an interval from each other along the outer circumferential direction of the bus bar guide 60 may be provided.

[0073] Also, there may be a plurality of pairs of adjacent busbar guide pieces 60a to 60d, and at least one pair of busbar guide pieces 60a, 60b may each be formed with a fitting portion 64c for fitting and connecting the busbar guide pieces 60a, 60b to each other.

[0074] Furthermore, the shape of the fitting portions 64c formed on each of the busbar guide pieces 60a, 60b of one pair may be the same as the shape of the fitting portions 64c formed on each of the busbar guide pieces 60c, 60d of the other pair.

[0075] Furthermore, the shape of the fitting portion 64c formed on each of the busbar guide pieces 60a, 60b of one pair may be different from the shape of the fitting portion 64c formed on each of the busbar guide pieces 60c, 60d of the other pair.

[0076] Furthermore, a sensor equivalent to the temperature detection sensor 70 may be disposed between the two bus bar guide pieces 60a, 60b that are disposed along the outer circumferential direction of the bus bar guide 60 at a distance from each other.

[0077] In addition, at least one busbar guide piece 60a has a step 65 or a recess on the surface opposite to the surface on which the groove portion 61 is formed, and it is preferable that the wiring 71 connected to the sensor corresponding to the temperature detection sensor 70 is at least partially covered by the step 65 or the recess.

[0078] Moreover, the depth of groove 61 is preferably equal to or less than half the width of second surface 52 of bus bar 50.

[0079] Furthermore, each of the bus bar guide pieces 60a to 60k may be provided with a through hole 62 for allowing the lead portion 41 provided on the coil 40 to pass therethrough.

[0080] The first surface 51 is preferably narrower than the second surface 52 .

[0081] Moreover, the busbar assembly 300 of this embodiment includes at least the above-mentioned busbar guide 60 and a plurality of busbars 50 arranged in a plurality of grooves 61 provided on the upper surface of the busbar guide 60, respectively.

[0082] This allows the variation in shape of the bus bars 50 to be accommodated, making it easy to arrange multiple bus bars 50 in the bus bar guide 60.

[0083] In addition, the motor 1000 of this embodiment at least comprises a rotor 200 having an output shaft 210 at its axis, a stator 100 arranged at a predetermined distance from the rotor 200, and the busbar assembly 300 attached to the upper part of the stator 100, and the stator 100 at least comprises an annular yoke 20, a plurality of teeth 10 connected to the inner circumference of the yoke 20 at a predetermined distance, and a plurality of coils 40 attached to each of the plurality of teeth 10, and two of the plurality of coils 40 are electrically connected via one of the plurality of busbars 50.

[0084] This allows multiple bus bars 50 to be easily installed in bus bar guide 60. Furthermore, since multiple bus bars 50 are positioned and arranged in bus bar guide 60, the assembly process of motor 1000 is simplified and assembly costs can be reduced.

[0085] In addition, the multiple busbars 50 are respectively arranged in multiple groove portions 61 provided on the upper surface of the busbar guide 60, and the coil 40 has a lead portion 41 for connecting to the busbar 50, and it is preferable that the lead portion 41 passes through a through hole 62 provided in the busbar guide 60, is pulled out above the busbar guide 60, and is electrically connected to the busbar 50.

[0086] It is also preferable that both ends of the bus bar are folded back, and that lead portion 41 and bus bar 50 are electrically connected in a state in which lead portion 41 is clamped between the ends of bus bar 50 .

[0087] <Variation 1> Fig. 8A is a perspective view of a busbar according to Modification 1. Fig. 8B is an enlarged schematic view of a connection portion between a busbar and a lead portion according to Modification 1. In Figs. 8A and 8B, the same reference numerals are used to designate the same parts as in the embodiment, and detailed description thereof will be omitted.

[0088] 8A and 8B differs from busbar 50 shown in Fig. 5A in that each of end portions 50a has a protrusion 50b extending upward from first surface 51. When busbar 50 and lead portion 41 are connected, the tip of lead portion 41 is supported by protrusion 50b.

[0089] According to this modification, lead portion 41 can be reliably held by end portion 50a of busbar 50. If busbar 50 does not have convex portion 50b, and if lead portions 41 vary in length, the tip of lead portion 41 may be located below first surface 51 on the upper side of busbar 50. In this case, the contact area between lead portion 41 and busbar 50 may not be sufficient, which may reduce the reliability of the connection.

[0090] On the other hand, according to this modification, a protrusion 50b is provided extending upward from first surface 51 of busbar 50, and lead portion 41 is supported by protrusion 50b. In other words, the tip of lead portion 41 is disposed to protrude upward from first surface 51 on the upper side of busbar 50. This makes it possible to ensure a sufficient contact area between lead portion 41 and busbar 50.

[0091] By connecting the protrusions 50b and the tips of the lead portions 41 by welding or the like, the process of connecting the lead portions 41 and the bus bars 50 can be simplified.

[0092] As described above, in the motor of this modified example, a convex portion 50b extending from the first surface 51 is provided at the end of the bus bar 50, and the lead portion 41 and the bus bar 50 are electrically connected with the tip of the lead portion 41 supported by the convex portion 50b.

[0093] <Variation 2> Fig. 9 is a top view of a bus bar according to Modification 2. In Fig. 9, the same parts as those in the embodiment are given the same reference numerals, and detailed description thereof will be omitted.

[0094] The busbar 50 shown in Fig. 9 differs from the busbar 50 shown in Fig. 1 and Fig. 5A in that one end 50a and the other end 50a are folded back in opposite directions in the circumferential direction. Both end portions 50a of the busbar 50 shown in Fig. 1 and Fig. 5A are folded back in the same direction in the circumferential direction so that the tip of each end is located radially inward.

[0095] According to this modification, it is possible to suppress deformation of the busbar 50 when an excessive mechanical shock is applied to the busbar 50. In the busbar assembly 300 shown in Fig. 1, when an impact is applied in the radial direction, the central portion of each busbar 50 is significantly displaced because both end portions 50a of the busbar 50 are fixed. In this case, if both end portions 50a of the busbar 50 are folded back in the same direction in the circumferential direction as shown in Fig. 5A, depending on the magnitude and direction of the force applied to the busbar 50, the central portion of the busbar 50 may be significantly displaced and ultimately deformed.

[0096] On the other hand, according to this modification, both end portions 50a of busbar 50 are folded back to opposite sides in the circumferential direction, so that the force applied to busbar 50 in the radial direction can be offset by both end portions 50a, thereby suppressing displacement of the central portion of busbar 50. This makes it possible to suppress deformation of busbar 50.

[0097] As described above, in the motor of this modified example, one end and the other end of the bus bar 50 are folded back in opposite directions with respect to the outer circumferential direction of the bus bar guide.

[0098] This makes it possible to suppress deformation of bus bar 50 when an excessive mechanical shock is applied to bus bar 50 .

[0099] (Other embodiments) New embodiments can also be made by appropriately combining the components shown in the embodiment and the modified examples 1 and 2. For example, the protrusion 50b shown in the modified example 1 may be provided on the bus bar 50 shown in the modified example 2.

[0100] The coil 40 may be a typical edgewise coil or a formed coil. Note that the term "formed coil" used here does not include a coil in which a conductor wire having a constant width and thickness is simply wound in a spiral shape.

[0101] The formed coil is formed, for example, by preparing a plurality of rectangular plate materials having different lengths, widths, or thicknesses and joining these plate materials by cold welding, welding, or other methods. The plate materials are made of a low-resistance material such as copper or aluminum.

[0102] Alternatively, the formed coil may be formed by so-called casting, in which copper or the like is melted and poured into a mold. Also, the formed coil may be formed by bending a plate-shaped conductor wire, the width or thickness of which has been changed in advance, at a predetermined position. Alternatively, the formed coil may be formed by rolling a plate-shaped conductor wire with a constant width and thickness at a predetermined position, changing the width or thickness in the middle, and then winding it in a spiral shape. In short, the formed coil is formed by adding another process other than winding the conductor wire, or by a method other than simple winding.

[0103] A sensor other than the temperature detection sensor 70 may be attached to the stator 100. For example, a magnetic detection sensor may be disposed inside at least one of the gaps 63a to 63d provided in the bus bar guide 60. [Industrial Applicability]

[0104] The bus bar guide of the present invention can accommodate variations in the shapes of the bus bars and coils and position the bus bars in predetermined positions, and is therefore useful when applied to motors. [Explanation of symbols]

[0105] 10 Teeth 20 York 30 Slots 40 Coil 41 Lead section 50 Busbar 50a End 50b Convex part 51 Page 1 52 Side 2 60 Busbar guide 60a~60k Busbar guide piece 61 Groove 62 Through hole 63a~63d Gap 64a~64d Fitting part 65 steps 70 Temperature detection sensor 71 Wiring 100 Stator 200 rotors 210 Output shaft 220 Rotor Core 230 Magnet 300 Busbar assembly 400 motor case 1000 Motor

Claims

1. A bus bar guide for fixing a bus bar that connects a plurality of coils provided in a motor, the busbar includes a plate-shaped conductor having a pair of first surfaces extending in a radial direction and facing each other, and a pair of second surfaces extending in an axial direction and continuous with the first surfaces and facing each other, the bus bar guide is configured by arranging a plurality of bus bar guide pieces, each of which is made of an insulator, in an annular shape; each of the bus bar guide pieces includes a groove for holding a first surface of the bus bar and for positioning the bus bar; A bus bar guide comprising at least one pair of bus bar guide pieces adjacent to each other and arranged at an interval from each other along an outer circumferential direction of the bus bar guide.

2. The bus bar guide according to claim 1, comprising a plurality of sets of two adjacent bus bar guide pieces, and at least one set of the bus bar guide pieces is formed with a fitting portion for fitting and connecting the bus bar guide pieces to each other.

3. The bus bar guide according to claim 2 , wherein a shape of the fitting portion formed on each of the bus bar guide pieces of one set is the same as a shape of the fitting portion formed on each of the bus bar guide pieces of the other set.

4. The bus bar guide according to claim 2 , wherein a shape of the fitting portion formed on each of the bus bar guide pieces of one set is different from a shape of the fitting portion formed on each of the bus bar guide pieces of the other set.

5. 2. The bus bar guide according to claim 1, further comprising a sensor disposed between two bus bar guide pieces spaced apart from each other along an outer circumferential direction of the bus bar guide.

6. The bus bar guide according to claim 5, wherein at least one bus bar guide piece has a step or a recess on a surface opposite to the surface on which the groove is formed, and at least a portion of a wiring connected to the sensor is covered by the step or the recess.

7. The bus bar guide according to claim 1 , wherein a depth of the groove is equal to or less than half a width of the second surface of the bus bar.

8. The bus bar guide according to claim 1 , wherein each of the plurality of bus bar guide pieces is provided with a through hole for passing a lead portion provided on the coil.

9. The bus bar guide according to claim 1 , wherein the first surface is narrower than the second surface.

10. 10. A busbar assembly comprising: the busbar guide according to claim 1; and a plurality of busbars respectively disposed in a plurality of the grooves provided on an upper surface of the busbar guide.

11. A rotor having an output shaft at its axis; a stator provided at a predetermined interval from the rotor; and the busbar assembly according to claim 10 attached to an upper portion of the stator. The stator includes: An annular yoke; a plurality of teeth connected to an inner periphery of the yoke at predetermined intervals; a plurality of coils attached to each of the plurality of teeth; A motor in which two coils of the plurality of coils are electrically connected via one bus bar of the plurality of bus bars.

12. 12. The motor according to claim 11, wherein the plurality of bus bars are respectively arranged in a plurality of grooves provided on an upper surface of a bus bar guide for fixing bus bars that connect a plurality of coils provided in the motor, the coils have lead portions for connecting to the bus bars, the lead portions pass through through holes provided in the bus bar guide, are drawn out above the bus bar guide, and are electrically connected to the bus bars.

13. 13. The motor according to claim 12, wherein both ends of the bus bar are folded back, and the lead portions and the bus bar are electrically connected with each other in a state where the lead portions are clamped between the ends of the bus bar.

14. 14. The motor according to claim 13, wherein an end of the bus bar has a protrusion extending from the first surface, and the lead portion and the bus bar are electrically connected with a tip of the lead portion supported by the protrusion.

15. The motor according to claim 13 or 14, wherein one end and the other end of the bus bar are folded back in opposite directions relative to an outer circumferential direction of the bus bar guide.

Images