motor

Abstract

A motor can be provided, including a shaft, a rotor coupled to the shaft, a stator disposed corresponding to the rotor, a busbar disposed on an upper side of the stator, a bearing plate disposed on an upper side of the busbar, and a power terminal unit coupled to the bearing plate so as to be electrically connected to the busbar. The busbar includes a first terminal, the power terminal unit includes a second body and a second terminal disposed in the second body, the bearing plate includes a first hole, a first end portion of the first terminal passes through the first hole so as to be disposed inside the second body, and the first end portion of the first terminal and a second end portion of the second terminal contact each other in the second body.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor. BACKGROUND

[0002] The motor can include a rotating shaft, a rotor, a stator, a housing, and a bearing plate. The rotor and the stator are accommodated in the housing. The housing is a cylindrical member having an open upper portion. The bearing plate covers the open upper portion of the housing. A bus bar can be disposed above the stator. Terminals of the bus bar are connected to coils wound around the stator and terminals provided on a cover. The terminals provided on the cover are connected to an external power source.

[0003] Since the length of the rotating shaft is exposed upward from the bearing plate, the cover and the bearing plate can be disposed to be spaced apart from each other by a considerable distance in the axial direction. Accordingly, the terminals of the bus bar can include end portions formed to extend upward to reach the terminals of the cover.

[0004] However, the motor having such a structure has the following problems.

[0005] Since the hole through which the end portion of the terminal of the bus bar passes is provided in the bearing plate, there is a problem in that foreign matter can be introduced through a gap between the end portion of the terminal of the bus bar and the hole.

[0006] In addition, since the length of the end portion of the terminal of the bus bar is considerable, there is a problem in that the end portion of the terminal of the bus bar, which contacts the terminals of the housing cover, is twisted when the position of the stator is misaligned when the stator is hot-pressed into the housing.

[0007] In addition, since the position of the end portion of the terminal of the bus bar, which contacts the terminals of the housing cover, in the axial direction changes depending on the position of the stator in the axial direction, there is a problem in that tolerance management is difficult.

[0008] In addition, since the end portion of the terminal of the bus bar is provided to be long, the end portion of the terminal of the bus bar has a structural problem of being easily bent.

[0009] In addition, since the end portion of the terminal of the bus bar is provided to be long, there is a problem in that a large amount of waste of the plate material is generated when the terminals of the bus bar are manufactured.

[0010] In addition, although it is not necessary to electroplate the cut surfaces of the plate material of the terminals of the bus bar, which are connected to the coils of the stator, after a press process is performed on the plate material, since it is necessary to electroplate the cut surfaces of the end portions of the terminals of the bus bar, which contact the terminals of the cover of the housing, after the press process is performed, all of the terminals of the bus bar are subjected to an electroplating process after the press process is performed, and thus there is a problem in that costs are greatly increased. SUMMARY

[0011] Technical Problem

[0012] The present application aims to provide a motor whose terminal structure from a stator to a terminal of a housing cover is simplified.

[0013] Technical Solution

[0014] One aspect of the present application provides a motor including a shaft, a rotor coupled to the shaft, a stator disposed corresponding to the rotor, a busbar disposed above the stator, a bearing plate disposed above the busbar, and a power terminal unit coupled to the bearing plate and electrically connected to the busbar, wherein the busbar includes a first terminal, the power terminal unit includes a second body and a second terminal disposed on the second body, the bearing plate includes a first hole, and a first end portion of the first terminal passing through the first hole and disposed in the second body and a second end portion of the second terminal contact each other in the second body.

[0015] The second body can include a second groove formed in a lower end portion of the second body, and the first end portion of the first terminal can be inserted into the second groove.

[0016] The second body can include a second hole, and the first end portion and the second end portion can be disposed to contact each other in the second hole and be exposed to the outside through the second hole.

[0017] A protrusion portion can be provided on the second end portion of the second terminal.

[0018] The bearing plate can include a third hole, the second body can include a first portion disposed outside the second terminal and a second portion extending downward from the first portion, and the second portion can include a first protrusion coupled to the third hole.

[0019] A lower surface of the second portion can be larger than a size of the first hole, and in a state in which the lower surface of the second portion contacts an upper surface of the bearing plate, the lower surface of the second portion can cover an entire area of the first hole.

[0020] In a radial direction around a central axis of the bearing plate, at least some of the plurality of first protrusions can be disposed at positions different from positions of the remaining first protrusions, and at least some of the plurality of third holes can be disposed at positions different from positions of the remaining third holes.

[0021] In a circumferential direction around the central axis of the bearing plate, at least some of the plurality of first protrusions can be disposed at different positions, and at least some of the plurality of third holes can be disposed at different positions.

[0022] The third hole can include a first third hole and a second third hole, the first third hole can be disposed closer to the central axis of the bearing plate than the second third hole, and in a radial direction about the central axis of the bearing plate, the first third hole can be disposed not to overlap the first hole, and the second third hole can be disposed to overlap the first hole.

[0023] In a radial direction of the central axis of the bearing plate, either one of the first end portion and the second end portion can be disposed on an inner side, and the other can be disposed on an outer side.

[0024] The second body can include a first groove in which the second terminal is disposed, the first groove can communicate with the first hole, and each of the first groove and the second groove can be connected to the second hole.

[0025] The second terminal can include a plurality of grooves recessed on the side surface, and the second body can include a second protrusion disposed in the plurality of grooves.

[0026] The bearing plate can include a fourth hole, and the housing can include a fifth hole aligned with the fourth hole in a state in which the first end portion is disposed in the second body.

[0027] Advantageous effects

[0028] According to the embodiments, advantageous effects of preventing foreign matter from being introduced through a gap between an end portion of a terminal of a bus bar and a hole are provided.

[0029] According to the present embodiment, advantageous effects of easily performing cumulative tolerance management at an end portion of a terminal of a bus bar which contacts a terminal of a cover are provided.

[0030] According to the present embodiment, advantageous effects of high rigidity against bending are provided.

[0031] According to the present embodiment, advantageous effects of reducing the amount of waste generated from a plate material are provided.

[0032] According to the present embodiment, advantageous effects of reducing plating costs are provided. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a view illustrating a motor according to an embodiment.

[0034] Figure 2 is a view illustrating a state in which a bus bar, a bearing plate, and a power terminal unit are coupled to each other.

[0035] Figure 3 is a view illustrating a bus bar, a bearing plate, and a power terminal unit before being coupled.

[0036] Figure 4 is a view illustrating a second body of the power terminal unit.

[0037] Figure 5 is a side cross-sectional view taken along line B-B of the second body of the power terminal unit. Figure 4

[0038] Figure 6 is a view illustrating a second terminal.

[0039] Figure 7 is a cross-sectional view illustrating a state in which a protruding portion of the second body is disposed in a groove of the second terminal.

[0040] Figure 8 is a view illustrating a state in which a first end portion of a first terminal and a second end portion of a second terminal are in contact in a second hole.

[0041] Figure 9 is a bottom view illustrating the second body on which a first protruding portion is disposed.

[0042] Figure 10 is a side view illustrating the second body coupled to a bearing plate.

[0043] Figure 11 is a plan view illustrating the bearing plate.

[0044] Figure 12 is a view illustrating a process of arranging the bearing plate and the housing.

[0045] Figure 13 is a view illustrating a state in which the bearing plate and the housing are coupled. DETAILED DESCRIPTION

[0046] Hereinafter, a direction parallel to a longitudinal direction (vertical direction) of the shaft is referred to as an axial direction, a direction perpendicular to the axial direction of the shaft is referred to as a radial direction, and a direction along a circumference of a circle having a radius in the radial direction of the shaft is referred to as a circumferential direction.

[0047] Figure 1 is a view illustrating a motor according to an embodiment.

[0048] Referring to Figure 1 , a motor according to the present embodiment can include a rotor 200, a magnet 200, a stator 300, a housing 500, a bus bar 600, a bearing plate 700, and a power terminal unit 800. Hereinafter, the term "inward" refers to a direction in a radial direction of the motor toward the rotating shaft 100, and the term "outward" refers to a direction opposite to the "inward".

[0049] ​The rotating shaft 100 can be a hollow member having one open side. Both end portions of the rotating shaft 100 can be rotatably supported by bearings in the axial direction. Portions having different outer diameters can be separately provided on the rotating shaft 100 in the axial direction.

[0050] The rotor 200 is a member provided on the outer circumferential surface of the rotating shaft 100, and can be a magnet that rotates in conjunction with the rotation of the rotating shaft 100.

[0051] The stator 300 is provided outside the rotating shaft 100 and the magnet 200. The stator 300 can include a stator core 310, an insulator 320 mounted on the stator core 310, and a coil 330 wound around the insulator 320. The coil 330 forms an electric field. The stator core 310 can be a single member or a plurality of separate cores combined. Also, the stator core 310 can be formed in the form of a plurality of thin steel plates stacked, but is not limited thereto. For example, the stator core 310 can be formed as one single unit.

[0052] When the rotor 200 is a magnet, the cover 400 fixes the magnet to the rotating shaft 100. The cover 400 surrounds some regions of the magnet and the rotating shaft 100. The cover 400 can be a molded member formed through an overmolding process, a can-shaped member surrounding the magnet, or an adhesive member.

[0053] The housing 500 can be provided outside the stator 300. The housing 500 can be a cylindrical member having an open upper portion. The rotating shaft 100, the magnet 200, the stator 300, and the cover 400 are accommodated in the housing 500. Also, the housing 500 can accommodate bearings that support the rotating shaft 100.

[0054] The bus bar 600 is provided above the stator 300. The bus bar 600 connects the coils 330 wound around the stator 300.

[0055] The bearing plate 700 is provided above the bus bar 600. The bearing 10 is accommodated in the bearing plate 700.

[0056] The power terminal unit 800 is provided above the bearing plate 700.

[0057] Figure 2 is a view illustrating a state in which the bus bar 600, the bearing plate 700, and the power terminal unit 800 are coupled to each other, and Figure 3 is a view illustrating the bus bar 600, the bearing plate 700, and the power terminal unit 800 before the bus bar 600, the bearing plate 700, and the power terminal unit 800 are coupled.

[0058] Referring to Figure 2 and Figure 3The bus bar 600 can be disposed under the bearing plate 700. The bus bar 600 can include a first body 610 and a first terminal 620. The first body 610 can be a molded member having a ring shape. The first terminal 620 can be connected to an end portion of the coil 330. Also, a first end portion 621 of the first terminal 620 contacts the power terminal unit 800. The first end portion 621 is disposed to extend upward. Three first end portions 621 can be connected to a U-phase power supply, a V-phase power supply, and a W-phase power supply.

[0059] The bearing plate 700 can include a first hole 710. The first hole 710 is formed through the upper surface and the lower surface of the bearing plate 700.

[0060] The power terminal unit 800 includes a second body 810 and a second terminal 820 disposed on the second body 810. The second body 810 surrounds the second terminal 820. The second body 810 can be a molded member disposed to extend vertically. The second body 810 is coupled to the bearing plate 700.

[0061] The second terminal 820 is connected to an external power supply or a terminal of a housing cover connected to the external power supply. The second terminal 820 is fixed to the second body 810. A second end portion 821 of the second terminal 820 contacts the first end portion 621.

[0062] The power terminal unit 800 is a separate unit from the bus bar 600. The power terminal unit 800 is disposed above the bearing plate 700. The bus bar 600 is disposed under the bearing plate 700.

[0063] Figure 4 is a view illustrating the second body 810 of the power terminal unit 800.

[0064] Referring to Figure 4 The second body 810 can include a first portion 810A and a second portion 810B. The first portion 810A is disposed outside the second terminal 820 and surrounds the second terminal 820. The second portion 810B extends from a lower side of the first portion 810A and is coupled to the bearing plate 700.

[0065] The first portion 810A includes a second hole 811. The second hole 811 is a hole for exposing the first end portion 621 of the first terminal 620 and the second end portion 821 of the second terminal 820 to be soldered. The first end portion 621 and the second end portion 821 are disposed to contact each other in the second hole 811.

[0066] The second portion 810B can include a plurality of first protrusions 812. The first protrusions 812 are disposed to protrude from a lower surface of the second portion 810B.

[0067] Figure 5 The diagram illustrates the second body 810 of the power terminal unit 800 along... Figure 4 The side view cross section cut by line BB.

[0068] Reference Figure 5 The second body 810 may include a first slot 801 and a second slot 802. The first slot 801 is disposed in the first portion 810A. The second slot 802 is disposed from the first portion 810A to the second portion 810B.

[0069] The second terminal 820 is disposed in the first groove 801. With the second terminal 820 disposed in the first groove 801, the second end portion 821 of the second terminal 820 is positioned in the second hole 811.

[0070] The second groove 802 communicates with the first hole 710. Furthermore, the second groove 802 is disposed above the first hole 710. The first end portion 621 of the first terminal 620 is disposed in the second groove 802. With the first end portion 621 disposed in the second groove 802, the end of the first end portion 621 is positioned in the second hole 811. The second groove 802 guides the end of the first end portion 621 into the second hole 811.

[0071] Figure 6 This is a view illustrating the second terminal 820.

[0072] exist Figure 6 In this configuration, the second terminal 820 is a three-terminal component connected to the U-phase power supply, the V-phase power supply, and the W-phase power supply. The second terminal 820 is configured to extend vertically. The second terminal 820 may include multiple grooves 822. The grooves 822 are recessed into the side edges of the second terminal 820. The grooves 822 increase the bonding force between the second body 810 and the second terminal 820. A protrusion 823 may be provided in the second end portion 821 of the second terminal 820. The protrusion 823 increases the bonding force between the first end portion 621 and the second end portion 821 during welding.

[0073] Since the second terminal 820 is separate from the first terminal 620, the amount of waste material in the plate component can be significantly reduced by simplifying the shape of the metal plate of the first terminal 620 and the shape of the metal plate of the second terminal 820.

[0074] Specifically, the three second terminals 820 have the same shape and size. Furthermore, the three second terminals 820 are components with a quadrilateral plate shape and straight edges. Therefore, the amount of waste material generated from the plate components after the pressing process is performed on the second terminals 820 can be significantly reduced.

[0075] Further, since the three second terminals 820 have the same shape and size, size management is easy, and thus there is an advantage of reducing cumulative tolerances.

[0076] Meanwhile, after performing the press processing, a process of plating a cut surface of an end portion of the second terminal 820, which is in contact with a terminal of a cover of the housing, is required (hereinafter, a post-plating process). Since the second terminal 820 is a separate unit from the first terminal 620, the post-plating process, which is relatively high in cost, can be performed only on the second terminal 820, and thus there is an advantage of significantly reducing plating costs.

[0077] Figure 7 is a cross-sectional view illustrating a state in which the second body 810 is disposed in the second terminal 820.

[0078] Referring to Figure 7 , the second body 810 can include a second protrusion 803 on an inner wall. The second protrusion 803 is inserted into the groove 822 to limit the second terminal 820 in a vertical direction and prevent the second terminal 820 from departing from the second body 810.

[0079] Figure 8 is a view illustrating a state in which a first end portion 621 of a first terminal 620 and a second end portion 821 of a second terminal 820 are in contact in a second hole 811.

[0080] Referring to Figure 8 , the first end portion 621 of the first terminal 620 and the second end portion 821 of the second terminal 820 overlap and are in contact with each other in the second hole 811. In a radial direction about a central axis C of the bearing plate 700, the first end portion 621 can be disposed on an outer side, and the second end portion 821 can be disposed on an inner side. When a welding rod is pressed in a direction of an arrow W of Figure 8 , the first terminal 620 and the second terminal 820 are fused and connected. Since each of the first end portion 621 and the second end portion 821 is formed in a plate shape having a width greater than a thickness, a contact area for fusion can be sufficiently secured.

[0081] Figure 9 is a bottom view of the second body 810 on which a first protrusion 812 is disposed.

[0082] Referring to Figure 3 and Figure 9A plurality of first protrusions 812 can be disposed on a bottom surface of the second portion 810B of the second body 810. The first protrusions 812 can include a plurality of first first protrusions 812A and a plurality of second first protrusions 812B. The first first protrusions 812A can be disposed closer to the central axis C of the bearing plate 700 than the second first protrusions 812B on an opposite inner side. For example, the plurality of first first protrusions 812A can be disposed on a first circular orbit O1 around the central axis C of the bearing plate 700. Also, the plurality of second first protrusions 812B can be disposed on a second circular orbit O2 formed around the central axis C of the bearing plate 700 and having a greater radius than the first circular orbit O1.

[0083] Meanwhile, an inner edge of the second portion 810B can be an inner circumferential surface around the central axis C of the bearing plate 700, and an outer edge of the second portion 810B can be an outer circumferential surface around the central axis C of the bearing plate 700.

[0084] Figure 10 is a side view illustrating the second body 810 coupled to the bearing plate 700.

[0085] Referring to Figure 3 , Figure 9 and Figure 10 , the first first protrusions 812A and the second first protrusions 812B are disposed apart from each other in a radial direction around the central axis C of the bearing plate 700. The second body 810 and the second terminals 820 are disposed to extend vertically. Also, since the three second terminals 820 are disposed in a width direction and the second terminals 820 have a flat plate shape having a thickness smaller than a width, the second terminals 820 can be easily bent inward or outward in a direction of the double arrow H of Figure 10 , but since the first first protrusions 812A and the second first protrusions 812B are disposed in a double column shape in the radial direction, there is an advantage of increasing rigidity against bending.

[0086] Also, since the horizontal cross-sectional size of the second portion 810B is greater than the horizontal cross-sectional size of the first portion 810A, there is an advantage of improving structural stability. In particular, since the portion in which the first portion 810A is connected to the second portion 810B is formed as a curved surface 804, there is an advantage of further improving structural stability against bending.

[0087] Meanwhile, since the horizontal cross-sectional size of the second portion 810B is greater than the size of the first hole 710 such that the bottom surface of the second portion 810B completely covers the first hole 710, there is an advantage of preventing foreign matter from being introduced through a gap between the end portion of the terminal of the bus bar 600 and the hole.

[0088] Figure 11 is a plan view illustrating the bearing plate 700.

[0089] Referring to Figure 3 and Figure 11 , the bearing plate 700 can include a plurality of third holes 720 into which the first protrusions 812 are inserted. The third holes 720 are formed through the upper surface and the lower surface of the bearing plate 700. The third holes 720 can be disposed adjacent to the first holes 710. The third holes 720 can include a first third hole 721 and a second third hole 722.

[0090] The first third hole 721 can be disposed closer to the central axis C of the bearing plate 700 than the second third hole 722. Also, in a radial direction about the central axis C of the bearing plate 700, the first third hole 721 can be disposed not to overlap the first hole 710, and the second third hole 722 can be disposed in the region S overlapping the first hole 710.

[0091] The positions of the third holes 720 correspond to the positions of the first protrusions 812.

[0092] Meanwhile, a plurality of bolt fastening holes 740 can be disposed in the bearing plate 700.

[0093] Figure 12 is a view illustrating a process of arranging the bearing plate 700 and the housing 500, and Figure 13 is a view illustrating a state in which the bearing plate 700 and the housing 500 are coupled.

[0094] Referring to Figure 11 to Figure 13 , the bearing plate 700 can include a plurality of fourth holes 730. The fourth holes 730 are formed through the upper surface and the lower surface of the bearing plate 700. The fourth holes 730 are holes for aligning the first end portion 621 of the first terminal 620 and the second end portion 821 of the second terminal 820.

[0095] A plurality of fifth holes 510 are disposed in the housing 500. In a state in which the fourth holes 730 and the fifth holes 510 are aligned, the position of the upper end portion of the second terminal 820 is aligned with a terminal of a cover of the housing or with a terminal of an external power source.

[0096] In a state in which the power terminal unit 800 is coupled to the bearing plate 700, when the pin P passes through the fourth holes 730 of the bearing plate 700 and is inserted into the fifth holes 510 of the housing 500, the tolerance of the position of the upper end portion of the second terminal 820 can be reduced. In a state in which the pin P is inserted into the fourth holes 730 and the fifth holes 510, the bolt V can be fastened to the bolt fastening holes 740 to fix the bearing plate 700 to the housing 500. In a state in which the bolt V is fastened, the pin is removed.

[0097] In the above-described embodiments, an example of an inner rotor type motor has been described, but the present application is not limited thereto. The present application can also be applied to an outer rotor type motor. Furthermore, the present application can be used in various devices for vehicles, household appliances, and the like.

Claims

1. A motor, the motor comprising: axis; Rotor, the rotor being connected to the shaft; Stator, the stator being configured to correspond to the rotor; Busbar, the busbar being disposed above the stator; A bearing plate, the bearing plate being disposed above the busbar; and A power terminal unit, which is connected to the bearing plate and electrically connected to the busbar. The busbar includes a first terminal. The power terminal unit includes a second body and a second terminal disposed on the second body. The bearing plate includes a first hole, and The first end portion of the first terminal, which passes through the first hole and is disposed in the second body, and the second end portion of the second terminal, are in contact with each other in the second body. The second body includes a first portion disposed outside the second terminal and a second portion extending downward from the first portion. The first portion includes a second hole, and the first end portion and the second end portion are configured to contact each other in the second hole and be exposed to the outside through the second hole.

2. The motor according to claim 1, wherein: The second body includes a second groove formed in the lower end portion of the second body; and The first end portion of the first terminal is inserted into the second slot.

3. The motor according to claim 2, wherein: The second body includes a first slot, a second terminal is disposed in the first slot, the first slot communicates with the first hole, and each of the first slot and the second slot is connected to the second hole.

4. The motor according to claim 1, wherein, A protrusion is provided on the second end portion of the second terminal.

5. The motor according to claim 1, wherein: The bearing plate includes a third hole; and The second part includes a first protrusion that connects to the third hole.

6. The motor according to claim 5, wherein: The size of the lower surface of the second part is larger than the size of the first hole; and With the lower surface of the second part in contact with the upper surface of the bearing plate, the lower surface of the second part covers the entire area of ​​the first hole.

7. The motor according to claim 5, wherein, In the radial direction about the central axis of the bearing plate: At least some of the first protrusions are located at positions different from the positions of the remaining first protrusions; and At least some of the third holes are located at positions different from the positions of the remaining third holes.

8. The motor according to claim 7, wherein, In the circumferential direction about the central axis of the bearing plate: At least some of the first protrusions are disposed at different locations; and At least some of the third holes are located at different positions.

9. The motor according to claim 5, wherein: The third hole includes a first third hole and a second third hole; The first and third holes are positioned closer to the central axis of the bearing plate than the second and third holes; and In the radial direction about the central axis of the bearing plate, the first and third holes are configured not to overlap with the first hole, and the second and third holes are configured to overlap with the first hole.

10. The motor according to claim 1, wherein, In the radial direction of the central axis of the bearing plate: Either the first end portion or the second end portion is disposed on the inner side; and The other one is located on the outside.

Images