Motor

Abstract

The present invention may provide a motor including: a shaft; a rotor coupled to the shaft; a stator provided to correspond to the rotor; a bus bar provided above the stator; a cover member disposed above the bus bar; and a power supply terminal unit coupled to the cover and electrically connected to the bus bar, in which the bus bar includes a first terminal, the power supply terminal unit includes a second body and a second terminal disposed on the second body, the cover includes a first hole, and the power supply terminal unit is electrically connected to the bus bar. And a first end portion of the first terminal and a second end portion of the second terminal, which pass through the first hole and are disposed in the second body, are in contact with each other in the second body.

Description

[0001] This application is a divisional application of the invention patent application filed on October 14, 2020, with application number 202080072387.5 (PCT / KR2020 / 014004) and entitled "Motor". Technical Field

[0002] This invention relates to motors. Background Technology

[0003] A motor may include a rotating shaft, a rotor, a stator, a housing, and a cover. The rotor and stator are housed within the housing. The housing is a cylindrical member with an open upper portion. The cover covers the open upper portion of the housing. Busbars may be disposed above the stator. Terminals of the busbars are connected to coils wound around the stator and to terminals disposed on the cover. Terminals disposed on the cover are connected to an external power source.

[0004] Since the length of the rotating shaft is exposed upwards from the cover, the covers can be configured to be spaced considerably apart from each other in the axial direction. Therefore, the terminals of the busbar may include end portions formed to extend upwards to reach the terminals of the covers.

[0005] However, motors with such a structure have the following problems.

[0006] Because the holes through which the end portions of the busbar terminals pass are located in the cover, the problem is that foreign objects may be introduced through the gap between the end portions of the busbar terminals and the holes.

[0007] Furthermore, since the end portions of the busbar terminals are quite long, when the stator is hot-pressed into the housing, a problem arises where the end portions of the busbar terminals that contact the terminals of the housing cover twist when the stator is not aligned.

[0008] Furthermore, since the axial position of the end portion of the busbar terminal that contacts the terminal of the housing cover changes depending on the axial position of the stator, there is a problem of tolerance management.

[0009] Furthermore, because the end portions of the busbar terminals are quite long, the end portions of the busbar terminals have a structural problem of being easily bent.

[0010] Furthermore, because the end portion of the busbar terminals is quite long, there is a problem of generating a large amount of waste board material during the manufacturing of the busbar terminals.

[0011] Furthermore, although it is not necessary to electroplate the cut surfaces of the board material that connects the busbar to the stator coil after pressing, the cut surfaces of the ends of the busbar terminals that contact the terminals of the housing cover need to be electroplated after pressing. Therefore, all terminals of the busbar need to be electroplated after pressing, which greatly increases the cost. Summary of the Invention

[0012] Technical issues

[0013] The present invention aims to provide a motor in which the terminal structure from the stator to the terminals of the housing cover is simplified.

[0014] Technical solution

[0015] One aspect of the present invention provides a motor comprising: a shaft; a rotor coupled to the shaft; a stator disposed opposite to the rotor; a busbar disposed above the stator; a cover disposed above the busbar; and a power terminal unit coupled to the cover 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 cover 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.

[0016] The second body may include a second groove formed in the lower end of the second body, and a first end portion of the first terminal may be inserted into the second groove.

[0017] The second body may include a second hole, and the first end portion and the second end portion may be configured to contact each other in the second hole and be exposed to the outside through the second hole.

[0018] A protrusion may be provided on the second end portion of the second terminal.

[0019] The cover may include a third hole, the second body may include a first portion disposed outside the second terminal and a second portion extending downward from the first portion, and the second portion may include a first protrusion connected to the third hole.

[0020] The size of the lower surface of the second part can be larger than the size of the first hole, and when the lower surface of the second part is in contact with the upper surface of the cover, the lower surface of the second part can cover the entire area of ​​the first hole.

[0021] In the radial direction about the central axis of the cover, at least some of the first protrusions may be located at positions different from the remaining first protrusions, and at least some of the third holes may be located at positions different from the remaining third holes.

[0022] In the circumferential direction around the central axis of the cover, at least some of the first protrusions may be located at different positions, and at least some of the third holes may be located at different positions.

[0023] The third hole may include a first third hole and a second third hole. The first third hole may be positioned closer to the central axis of the cover than the second third hole. In the radial direction around the central axis of the cover, the first third hole may be positioned not to overlap with the first hole, while the second third hole may be positioned to overlap with the first hole.

[0024] In the radial direction of the central axis of the cover, either the first end portion or the second end portion may be located on the inner side, and the other may be located on the outer side.

[0025] The second body may include a first slot, a second terminal disposed in the first slot, the first slot may communicate with a first hole, and each of the first slot and the second slot may be connected to the second hole.

[0026] The second terminal may include a plurality of recesses recessed on a side surface, and the second body may include a second protrusion disposed in the plurality of recesses.

[0027] The cover may include a fourth hole, and the housing may include a fifth hole aligned with the fourth hole while the first end portion is disposed in the second body.

[0028] Beneficial effects

[0029] According to the embodiment, it provides the advantageous effect of preventing foreign objects from being introduced through the gap between the end portion of the busbar terminal and the hole.

[0030] According to this embodiment, it is advantageous to facilitate cumulative tolerance management at the end portion of the busbar terminal that contacts the terminal of the cover.

[0031] According to this embodiment, the advantageous effect of high rigidity and resistance to bending is provided.

[0032] According to this embodiment, it is advantageous to reduce the amount of waste generated from the sheet material.

[0033] According to this embodiment, the beneficial effect of reducing electroplating costs is provided. Attached Figure Description

[0034] Figure 1 This is a view illustrating a motor according to an embodiment.

[0035] Figure 2 This is a view illustrating the interconnected state of the busbar, cover, and power terminal unit.

[0036] Figure 3 This is a view of the busbar, cover, and power terminal unit before they are connected.

[0037] Figure 4 This is a view illustrating the second body of the power terminal unit.

[0038] Figure 5 The illustration shows the second body of the power terminal unit along... Figure 4 The side view cross section cut by line BB.

[0039] Figure 6 This is a view illustrating the second terminal.

[0040] Figure 7 This is a cross-sectional view illustrating the state in which the protrusion of the second body is positioned in the groove of the second terminal.

[0041] Figure 8 This is a view illustrating the state in which the first end portion of the first terminal and the second end portion of the second terminal are in contact in the second hole.

[0042] Figure 9 It is a bottom view of the second body on which the first protrusion is provided.

[0043] Figure 10 This is a side view illustrating the second body connected to the cover.

[0044] Figure 11 It is a plan view of the cover.

[0045] Figure 12 This is a view illustrating the process of arranging the cover and the housing.

[0046] Figure 13 This is a view illustrating the connection between the cover and the housing. Detailed Implementation

[0047] In the following text, the direction parallel to the longitudinal direction (vertical direction) of the axis is called the axial direction, the direction perpendicular to the axial direction based on the axis is called the radial direction, and the direction along the circumference of a circle having a radius along the radial direction based on the axis is called the circumferential direction.

[0048] Figure 1 This is a view illustrating a motor according to an embodiment.

[0049] Reference Figure 1 The motor according to this embodiment may include a rotor 200, a magnet 200, a stator 300, a housing 500, a busbar 600, a cover 700, and a power terminal unit 800. In the following text, the term "inward" refers to a direction toward the rotation axis 100 in the radial direction of the motor, and the term "outward" refers to the opposite direction to "inward".

[0050] The rotating shaft 100 can be a hollow member with an open side. In the axial direction, both ends of the rotating shaft 100 can be rotatably supported by bearings. Parts with different outer diameters can be individually arranged on the rotating shaft 100 in the axial direction.

[0051] The rotor 200 is a component disposed on the outer peripheral surface of the rotating shaft 100, and may be a magnet that rotates in conjunction with the rotation of the rotating shaft 100.

[0052] The stator 300 is disposed outside the rotating shaft 100 and the magnet 200. The stator 300 may 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 generates an electric field. The stator core 310 may be a single component or a combination of multiple separate cores. Furthermore, the stator core 310 may be formed in the form of multiple thin steel plates stacked, but is not limited thereto. For example, the stator core 310 may be formed as a single unit.

[0053] When the rotor 200 is a magnet, the rotor cover secures the magnet to the rotation shaft 100. The rotor cover surrounds certain areas of the magnet and the rotation shaft 100. The rotor cover can be a molded component formed by overmolding, a can-shaped component surrounding the magnet, or an adhesive component.

[0054] The housing 500 may be disposed outside the stator 300. The housing 500 may be a cylindrical member with an open upper portion. The rotating shaft 100, magnet 200, stator 300, and rotor cover are housed within the housing 500. Furthermore, the housing 500 may house bearings supporting the rotating shaft 100.

[0055] Busbar 600 is positioned above stator 300. Busbar 600 connects to coil 330 wound around stator 300.

[0056] The cover 700 is positioned above the busbar 600. The bearing 10 is housed within the cover 700.

[0057] The power terminal unit 800 is located above the cover 700.

[0058] Figure 2 This is a view illustrating the interconnected state of the busbar 600, cover 700, and power terminal unit 800. Figure 3 The diagram shows a view of the busbar 600, cover 700, and power terminal unit 800 before they are connected.

[0059] Reference Figure 2 and Figure 3 Busbar 600 may be disposed below cover 700. Busbar 600 may include a first body 610 and a first terminal 620. The first body 610 may be a molded member with an annular shape. The first terminal 620 may be connected to the end portion of coil 330. Furthermore, the first end portion 621 of the first terminal 620 contacts the power terminal unit 800. The first end portion 621 is configured to extend upward. The three first end portions 621 may be connected to the U-phase power supply, V-phase power supply, and W-phase power supply.

[0060] The cover 700 may include a first hole 710. The first hole 710 is formed to pass through the upper and lower surfaces of the cover 700.

[0061] 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 may be a molded member configured to extend vertically. The second body 810 is connected to a cover 700.

[0062] The second terminal 820 is connected to an external power source or a terminal on the housing cover that is connected to an external power source. The second terminal 820 is fixed to the second body 810. The second end portion 821 of the second terminal 820 contacts the first end portion 621.

[0063] The power terminal unit 800 is a separate unit from the busbar 600. The power terminal unit 800 is located above the cover 700. The busbar 600 is located below the cover 700.

[0064] Figure 4 This is a view illustrating the second body 810 of the power terminal unit 800.

[0065] Reference Figure 4 The second body 810 may 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 the lower side of the first portion 810A and is connected to the cover 700.

[0066] The first part 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 for welding. The first end portion 621 and the second end portion 821 are configured to contact each other in the second hole 811.

[0067] The second part 810B may include a plurality of first protrusions 812. The first protrusions 812 are configured to protrude from the lower surface of the second part 810B.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Figure 6 This is a view illustrating the second terminal 820.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Furthermore, since the three second terminals 820 have the same shape and size, dimensional management is easy, and therefore there is the advantage of reducing cumulative tolerances.

[0077] Simultaneously, after the pressing process, it is necessary to perform electroplating on the cut surface of the end portion of the second terminal 820 that contacts the terminal of the housing cover (hereinafter, post-electroplating process). Since the second terminal 820 is a separate unit from the first terminal 620, the relatively expensive post-electroplating process can be performed only on the second terminal 820, thus significantly reducing the electroplating cost.

[0078] Figure 7 This is a cross-sectional view illustrating the state in which the protrusion of the second body 810 is disposed in the groove 822 of the second terminal 820.

[0079] Reference Figure 7 The second body 810 may include a second protrusion 803 on its inner wall. The second protrusion 803 is inserted into the groove 822 to restrict the second terminal 820 in the vertical direction and prevent the second terminal 820 from leaving the second body 810.

[0080] Figure 8 This is a view illustrating the state in which the first end portion 621 of the first terminal 620 and the second end portion 821 of the second terminal 820 are in contact in the second hole 811.

[0081] Reference 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 contact each other in the second hole 811. In the radial direction about the central axis C of the cover 700, the first end portion 621 may be disposed on the outer side, and the second end portion 821 may be disposed on the inner side. When the welding rod along... Figure 8When the first end portion 621 and the second end portion 821 are pressed in the direction of arrow W, 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 as a plate shape with a width greater than its thickness, the contact area for fusion can be sufficiently ensured.

[0082] Figure 9 This is a bottom view of the second body 810, on which the first protrusion 812 is provided.

[0083] Reference Figure 3 and Figure 9 Multiple first protrusions 812 may be disposed on the bottom surface of the second portion 810B of the second body 810. The first protrusions 812 may include multiple first protrusions 812A and multiple second protrusions 812B. The first protrusions 812A may be disposed relatively inwardly, closer to the central axis C of the cover 700 than the second protrusions 812B. For example, the multiple first protrusions 812A may be disposed on a first circular track O1 about the central axis C of the cover 700. Furthermore, the multiple second protrusions 812B may be disposed on a second circular track O2, which is formed about the central axis C of the cover 700 and has a larger radius than the first circular track O1.

[0084] Meanwhile, the inner edge of the second part 810B can be the inner peripheral surface around the central axis C of the cover 700, and the outer edge of the second part 810B can be the outer peripheral surface around the central axis C of the cover 700.

[0085] Figure 10 This is a side view illustrating the second body 810 connected to the cover 700.

[0086] Reference Figure 3 , Figure 9 and Figure 10 The first protrusion 812A and the second protrusion 812B are arranged separately from each other in the radial direction about the central axis C of the cover 700. The second body 810 and the second terminal 820 are arranged to extend vertically. In addition, since the three second terminals 820 are arranged in the width direction, and the second terminal 820 has a flat plate shape with a thickness less than its width, the second terminal 820 can... Figure 10 The double arrow H can easily bend inward or outward, but since the first protrusion 812A and the second protrusion 812B are arranged in a double column shape in the radial direction, there is an advantage of increasing the rigidity against bending.

[0087] Furthermore, since the horizontal cross-sectional size of the second part 810B is larger than that of the first part 810A, there is an advantage in improving structural stability. Specifically, since the portion connecting the first part 810A to the second part 810B is formed as a curved surface 804, there is an advantage in further improving the structural resistance to bending.

[0088] Meanwhile, since the horizontal cross-sectional size of the second part 810B is larger than that of the first hole 710, the bottom surface of the second part 810B completely covers the first hole 710, thus preventing foreign objects from being introduced through the gap between the end portion of the terminal of the busbar 600 and the hole.

[0089] Figure 11 This is a plan view of the cover 700.

[0090] Reference Figure 3 and Figure 11 The cover 700 may include a plurality of third holes 720 into which the first protrusion 812 is inserted. The third holes 720 are formed to pass through the upper and lower surfaces of the cover 700. The third holes 720 may be positioned adjacent to the first holes 710. The third holes 720 may include a first third hole 721 and a second third hole 722.

[0091] The first and third holes 721 can be positioned closer to the central axis C of the cover 700 than the second and third holes 722. Furthermore, in the radial direction about the central axis C of the cover 700, the first and third holes 721 can be positioned so as not to overlap with the first hole 710, and the second and third holes 722 can be positioned in the region S that overlaps with the first hole 710.

[0092] The position of the third hole 720 corresponds to the position of the first protrusion 812.

[0093] Meanwhile, multiple bolt fastening holes 740 can be provided in the cover 700.

[0094] Figure 12 This is a view illustrating the process of arranging the cover 700 and the housing 500, and Figure 13 This is a view illustrating the connection between the cover 700 and the housing 500.

[0095] Reference Figure 11 to Figure 13 The cover 700 may include a plurality of fourth holes 730. The fourth holes 730 are formed to pass through the upper and lower surfaces of the cover 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.

[0096] The housing 500 is provided with a plurality of fifth holes 510. With the fourth hole 730 and the fifth hole 510 aligned, the upper end of the second terminal 820 is aligned with the terminal of the housing cover or with the terminal of the external power supply.

[0097] With the power terminal unit 800 connected to the cover 700, when pin P passes through the fourth hole 730 of the cover 700 and is inserted into the fifth hole 510 of the housing 500, the positional tolerance of the upper end of the second terminal 820 can be reduced. With pin P inserted into both the fourth hole 730 and the fifth hole 510, bolt V can be tightened to bolt fastening hole 740 to secure the cover 700 to the housing 500. With bolt V tightened, the pin is removed.

[0098] In the above embodiments, an example of an internal rotor type motor has been described, but the present invention is not limited thereto. The present invention can also be applied to external rotor type motors. Furthermore, the present invention can be used in various devices used in vehicles, household appliances, etc.

Claims

1. A motor comprising: a shaft; a rotor coupled to the shaft; a stator disposed corresponding to the rotor; a busbar disposed above the stator; a cover disposed above the busbar and including a first hole; and a power terminal unit disposed above the cover, wherein the busbar is electrically connected to the power terminal unit through the first hole, and the power terminal unit is coupled to the cover so as to cover the first hole.

2. The motor according to claim 1, wherein, the power terminal unit is fusion bonded to the cover, and a fusion bonding area between the power terminal unit and the cover is formed in a radial direction as double rows.

3. The motor according to claim 2, wherein the power terminal unit includes a first protrusion coupled to the cover, and the first protrusion is arranged in the radial direction as double rows.

4. The motor according to claim 3, wherein the first protrusion includes a first first protrusion and a second first protrusion, and the first first protrusion and the second first protrusion are positioned on different circular tracks around a central axis of the cover.

5. The motor according to claim 3, wherein the cover includes a plurality of third holes through which the first protrusion passes.

6. The motor according to claim 5, wherein, some of the plurality of third holes overlap the first hole in a radial direction, and other of the plurality of third holes do not overlap the first hole in the radial direction.

7. The motor according to claim 1, wherein an overlapping area between a first terminal of the busbar and a second terminal of the power terminal unit is exposed to the outside above the cover for fusion.

8. The motor according to claim 7, wherein, the power terminal unit includes a second hole for exposing the overlapping area between the first terminal of the busbar and the second terminal of the power terminal unit, a first slot connected to the second hole in which the second terminal of the power terminal unit is disposed; and a second slot connected to the second hole in which the first terminal of the busbar is disposed.

9. The motor according to claim 8, wherein, the second slot is aligned with the first hole.

10. The motor according to claim 1, further comprising a housing that houses the stator, wherein the cover includes a fourth hole, the housing includes a fifth hole, and the cover and the housing are aligned such that a pin is inserted into both the fourth hole and the fifth hole.

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