Motor

Abstract

To simplify a terminal structure from a stator to a terminal of a housing cover.SOLUTION: The present invention may provide a motor including: a shaft 100; a rotor 200 coupled to the shaft; a stator 300 disposed to correspond to the rotor 100; a busbar 600 disposed above the stator; a bearing plate 700 disposed above the busbar; and a power terminal unit 800 coupled to the bearing plate 700 and electrically connected to the busbar 600. The busbar 600 includes a first terminal. The power terminal unit 800 includes a second body, and a second terminal disposed on the second body. The bearing plate includes a first hole. A first end portion of the first terminal, which passes through the first hole and is disposed in the second body, and a second end portion of the second terminal are in contact with each other in the second body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The embodiment relates to a motor. [Background technology]

[0002] The motor may include a rotating shaft, a rotor, a stator, a housing, and a cover. The rotor and stator are contained in the housing. The housing is a cylindrical member with an open top. The cover covers the open top of the housing. A bus bar may be disposed above the stator. Terminals of the bus bar are connected to the coil wound on the stator and to terminals disposed on the cover. The connected terminals disposed on the cover are connected to an external power source.

[0003] The covers can be spaced apart axially by a considerable distance due to the length of the rotating shaft exposed on the upper side of the cover, so that the terminals of the busbars can include ends formed long on the upper side to reach the terminals of the cover.

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

[0005] The cover has holes through which the ends of the terminals of the bus bars pass, but there is a problem in that foreign matter can get into the gap between the holes and the ends of the terminals of the bus bars.

[0006] Furthermore, since the ends of the bus bar terminals are quite long, there is a problem that if the stator is misaligned when hot press-fitting the stator into the housing, the ends of the bus bar terminals that come into contact with the terminals of the housing cover will also be misaligned.

[0007] Furthermore, since the axial position of the end of the terminal of the bus bar that contacts the terminal of the housing cover changes depending on the axial position of the stator, there is a problem that tolerance management is difficult.

[0008] Furthermore, since the ends of the terminals of the bus bars are arranged long, they are easily bent, resulting in a problem of structural fragility.

[0009] Furthermore, since the end of the bus bar terminal is disposed long, there is a problem in that excessive scrap of plate material is generated when manufacturing the bus bar terminal.

[0010] In addition, although the terminals of the busbars connected to the stator coils are pressed onto a plate material and do not require plating on the cut surfaces, the ends of the terminals of the busbars that come into contact with the terminals of the housing cover also require plating on the cut surfaces after pressing. This results in a problem of significant cost increase as the entire terminal of the busbars is plated after pressing. Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, the present embodiment is intended to solve the above-mentioned problems, and has as its object to provide a motor that can simplify the terminal structure from the stator to the terminal of the housing cover. [Means for solving the problem]

[0012] An embodiment to achieve the above object may include a power supply terminal unit including a shaft, a rotor coupled to the shaft, a stator disposed corresponding to the rotor, a bus bar disposed above the stator, a cover disposed above the bus bar, and a power supply terminal unit coupled to the cover and electrically connected to the bus bar, wherein the bus bar includes a first terminal, and the power supply terminal unit includes a second body and a second terminal disposed on the second body, the cover including a first hole, a first end of the first terminal disposed inside the second body through the first hole and a second end of the second terminal contacting each other at the second body, the second body including a first part disposed outside the second terminal and a second part extending downward from the first part, the first part including a second hole, the first end and the second end being exposed to the outside by the second hole for fusing and overlapping at the second hole.

[0013] Preferably, the second body includes a second slot formed at a lower end thereof, and a first end of the first terminal can be inserted into the second slot.

[0014] Preferably, the second body includes a second hole, and the first end and the second end are arranged to contact each other at the second hole and can be exposed to the outside through the second hole.

[0015] Preferably, an embossment may be disposed on the second end of the second terminal.

[0016] Preferably, the cover includes a third hole, the second body includes a first part disposed outside the second terminal and a second part extending downward from the first part, and the second part may include a first protrusion coupled to the third hole.

[0017] Preferably, the size of the lower surface of the second part is larger than the size of the first hole, and the lower surface of the second part can cover the entire area of ​​the first hole while being in contact with the upper surface of the cover.

[0018] Preferably, based on the radial direction of the central axis of the cover, at least some of the plurality of first protrusions may be arranged at positions different from the rest, and at least some of the plurality of third holes may be arranged at positions different from the rest.

[0019] Preferably, based on the circumferential direction of the central axis of the cover, at least some of the plurality of first protrusions may be arranged at different positions from one another, and at least some of the plurality of third holes may be arranged at different positions from one another.

[0020] Preferably, the third holes include a 3-1 hole and a 3-2 hole, the 3-1 hole being disposed closer to the central axis of the cover than the 3-2 hole, and the 3-1 hole being disposed so as not to overlap with the first hole in the radial direction of the central axis of the cover, and the 3-2 hole being disposed so as to overlap with the first hole.

[0021] Preferably, one of the first end and the second end may be disposed on an inner side and the other on an outer side based on a radial direction of a central axis of the cover. [Effects of the Invention]

[0022] According to the embodiment, it is possible to provide an advantageous effect of preventing foreign matter from entering the gap between the end of the terminal of the bus bar and the hole.

[0023] According to the embodiment, there is provided an advantageous effect of facilitating cumulative tolerance control at the end portions of the terminals of the busbars that contact the terminals of the cover.

[0024] The embodiment provides the advantageous effect of high stiffness against bending.

[0025] The embodiment provides a highly advantageous effect of reducing scrap of plate material.

[0026] The embodiment provides an advantageous effect of reducing plating costs. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a diagram illustrating a motor according to an embodiment.

[0028] [Figure 2] 10 is a view illustrating a state in which a bus bar, a cover, and a power terminal unit are coupled to each other;

[0029] [Figure 3] 1 is a diagram illustrating a bus bar, a cover, and a power terminal portion before being coupled;

[0030] [Figure 4] 10 is a view illustrating a second body of a power terminal unit.

[0031] [Figure 5] 5 is a side cross-sectional view of the second body of the power terminal portion taken along line BB in FIG. 4.

[0032] [Figure 6] This is a diagram illustrating Terminal 2.

[0033] [Figure 7] 10 is a cross-sectional view illustrating a state in which a protrusion of a second body is disposed in a groove of a second terminal. FIG.

[0034] [Figure 8] 10 is a view illustrating a state in which a first end of a first terminal and a second end of a second terminal are in contact with each other at a second hole.

[0035] [Figure 9]FIG. 10 is a bottom view of the second body illustrating the first protrusion disposed on the second body.

[0036] [Figure 10] FIG. 10 is a side view of the second body coupled to the cover.

[0037] [Figure 11] FIG.

[0038] [Figure 12] 10 is a view illustrating a process of aligning a cover and a housing.

[0039] [Figure 13] 1 is a view illustrating a state in which a cover and a housing are coupled together; DETAILED DESCRIPTION OF THE INVENTION

[0040] Hereinafter, the direction parallel to the longitudinal direction (vertical direction) of the shaft will be referred to as the axial direction, the direction perpendicular to the axial direction around the shaft will be referred to as the radial direction, and the direction along a circle having a radius in the radial direction around the shaft will be referred to as the circumferential direction.

[0041] FIG. 1 is a diagram illustrating a motor according to an embodiment.

[0042] 1, the motor according to the embodiment may include a rotor 100, a magnet 200, a stator 300, a housing 500, a bus bar 600, a cover 700, and a power terminal unit 800. Hereinafter, the term "inner" refers to a direction disposed toward the rotating shaft 100 based on the radial direction of the motor, and the term "outer" refers to a direction opposite to the inner side.

[0043] The rotating shaft 100 may be a hollow member with one side open. Both ends of the rotating shaft 100 may be rotatably supported by bearings in the axial direction. The rotating shaft 100 may be divided into sections with different outer diameters arranged along the axial direction.

[0044] The rotor 200 is a member disposed on the outer circumferential surface of the rotating shaft 100 and may be a magnet that moves in conjunction with the rotation of the rotating shaft 100 .

[0045] 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 attached to the stator core 310, and a coil 330 wound around the insulator 320. The coil 330 generates a magnetic field. The stator core 310 may be a single member or may be a combination of multiple divided cores. The stator core 310 may also be formed by stacking multiple thin steel plates, but is not limited to this. For example, the stator core 310 may be formed as a single unit.

[0046] If the rotor 200 is a magnet, the cover 400 fixes the magnet to the rotating shaft 100. The cover 400 surrounds the magnet and a portion of the rotating shaft 100. The cover 400 may be a molded member formed through overmolding, or a can member or adhesive member that surrounds the magnet.

[0047] The housing 500 may be disposed outside the stator 300. The housing 500 may be a cylindrical member with an open top. The housing 500 accommodates the rotating shaft 100, the magnet 200, the stator 300, and the cover 400 inside. The housing 500 may also accommodate a bearing that supports the rotating shaft 100.

[0048] Bus bar 600 is disposed above stator 300. Bus bar 600 connects coils 330 wound around stator 300.

[0049] The cover 700 is disposed above the bus bar 600. The bearing 10 is housed inside the cover 700.

[0050] The power terminal section 800 is disposed on the upper side of the cover 700 .

[0051] FIG. 2 is a diagram illustrating the state in which the bus bar 600, the cover 700, and the power terminal unit 800 are coupled to each other, and FIG. 3 is a diagram illustrating the bus bar 600, the cover 700, and the power terminal unit 800 before being coupled.

[0052] 2 and 3, the bus bar 600 may be disposed under the cover 700. The bus bar 600 may include a first body 610 and a first terminal 620. The first body 610 may be an annular molded member. The first terminal 620 may be connected to an end of the coil 330. A first end 621 of the first terminal 620 contacts the power supply terminal portion 800. The first end 621 is disposed on the upper side and extends long. The three first ends 621 may be connected to U-, V-, and W-phase power supplies, respectively.

[0053] The cover 700 may include a first hole 710. The first hole 710 is formed through the top and bottom surfaces of the cover 700.

[0054] The power terminal unit 800 includes a second body 810 and a second terminal 820 disposed in the second body 810. The second body 810 surrounds the second terminal 820. The second body 810 may be a molded member that is elongated in the vertical direction. The second body 810 is coupled to the cover 700.

[0055] The second terminal 820 is connected to an external power source or a terminal of the housing cover that is connected to the external power source. The second terminal 820 is fixed to the second body 810. A second end 821 of the second terminal 820 contacts the first end 621.

[0056] Such power supply terminal section 800 is separate from bus bar 600. Power supply terminal section 800 is disposed above cover 700. Bus bar 600 is disposed below cover 700.

[0057] FIG. 4 is a view illustrating the second body 810 of the power terminal unit 800. As shown in FIG.

[0058] 4, the second body 810 may include a first part 810A and a second part 810B. The first part 810A is disposed outside the second terminal 820 and surrounds the second terminal 820. The second part 810B extends from the underside of the first part 810A and is coupled to the cover 700.

[0059] The first part 810A includes a second hole 811. The second hole 811 exposes a first end 621 of the first terminal 620 and a second end 821 of the second terminal 820 to the outside for fusing. The first end 621 and the second end 821 are arranged to contact each other at the second hole 811.

[0060] The second part 810B may include a plurality of first protrusions 812. The first protrusions 812 are disposed to protrude from the lower surface of the second part 810B.

[0061] FIG. 5 is a side cross-sectional view of the second body 810 of the power terminal unit 800 taken along line BB in FIG.

[0062] 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 part 810A. The second slot 802 is disposed across the first part 810A and the second part 810B.

[0063] A second terminal 820 is disposed in the first slot 801. When the second terminal 820 is disposed in the first slot 801, a second end 821 of the second terminal 820 is positioned in the second hole 811.

[0064] The second slot 802 communicates with the first hole 710. The second slot 802 is disposed above the first hole 710. The first end 621 of the first terminal 620 is disposed in the second slot 802. With the first end 621 disposed in the second slot 802, the end of the first end 621 is positioned in the second hole 811. The second slot 802 guides the end of the first end 621 into the second hole 811.

[0065] FIG. 6 is a diagram illustrating the second terminal 820.

[0066] 6, the second terminals 820 are three terminal members connected to U, V, and W phase power sources. The second terminals 820 are arranged vertically. The second terminals 820 may include a plurality of grooves 822. The grooves 822 may be recessed at the side edges of the second terminals 820. The grooves 822 are intended to increase the bonding strength between the second body 810 and the second terminals 820 in the vertical direction. An embossment 823 may be arranged at the second end 821 of the second terminal 820. The embossment 823 is intended to increase the bonding strength between the first end 821 and the second end 821 during fusing.

[0067] Since the second terminal 820 is separate from the first terminal 620, the shape of the sheet metal of the first terminal 620 and the shape of the sheet metal of the second terminal 820 can be simplified, thereby significantly reducing scrap of sheet material.

[0068] In particular, the three second terminals 820 have the same shape and size. Also, each of the three second terminals 820 is a square plate-shaped member with straight edges. Therefore, scrap of plate material generated after press-forming the second terminals 820 can be significantly reduced.

[0069] In addition, the three second terminals 820 have the same shape and size, which makes it easy to control the dimensions, thereby reducing the cumulative tolerance.

[0070] Meanwhile, the end of the second terminal 820, which contacts the terminal of the housing cover, requires a plating process up to the cut surface after press processing (hereinafter referred to as a post-plating process). Because the second terminal 820 is separate from the first terminal 620, the relatively expensive post-plating process can be carried out only on the second terminal 820, which has the advantage of significantly reducing plating costs.

[0071] FIG. 7 is a cross-sectional view illustrating a state in which the protrusion of the second body 810 is disposed in the groove 822 of the second terminal 820. As shown in FIG.

[0072] 7, the second body 810 may include a second protrusion 803 on its inner wall. The second protrusion 803 is inserted into a groove 822 to hold the second terminal 820 in the up and down direction, thereby preventing the second terminal 820 from coming off the second body 810.

[0073] FIG. 8 illustrates a state in which the first end 621 of the first terminal 620 and the second end 821 of the second terminal 820 are in contact with each other at the second hole 811 .

[0074] 8, the first end 621 of the first terminal 620 and the second end 821 of the second terminal 820 are in contact with each other so as to overlap at the second hole 811. The first end 621 may be disposed on the outside and the second end 821 may be disposed on the inside in a radial direction around the central axis C of the cover 700. As shown by w in FIG. 8, when a welding rod presses the first end 621 and the second end 821, the first terminal 620 and the second terminal 820 are fused and connected. The first end 621 and the second end 821 are each formed in the form of a flat plate whose width is greater than its thickness, thereby ensuring a sufficient contact area for fusing.

[0075] FIG. 9 is a bottom view of the second body 810 illustrating the first protrusion 812 disposed on the second body 810. As shown in FIG.

[0076] 3 and 9, a plurality of first protrusions 812 may be arranged on the bottom surface of the second part 810B of the second body 810. The first protrusions 812 may include a plurality of 1-1 protrusions 812A and a plurality of 1-2 protrusions 812B. The 1-1 protrusions 812A may be arranged relatively inwardly so as to be closer to the central axis C of the cover 700 than the 1-2 protrusions 812B. For example, the plurality of 1-1 protrusions 812A may be arranged on a first circular orbit O1 based on the central axis C of the cover 700. The plurality of 1-2 protrusions 812B may be arranged on a second circular orbit O2 based on the central axis C of the cover 700 and having a larger radius than the first circular orbit O1.

[0077] Meanwhile, the inner edge of the second part 810B may be an inner peripheral surface based on the central axis C of the cover 700, and the outer edge of the second part 810B may be an outer peripheral surface based on the central axis C of the cover 700.

[0078] FIG. 10 is a side view of the second body 810 coupled to the cover 700. As shown in FIG.

[0079] 3, 9, and 10, the first-first protrusion 812A and the first-second protrusion 812B are spaced apart in the radial direction based on the central axis C of the cover 700. The second body 810 and the second terminal 820 are arranged vertically. Furthermore, the three second terminals 820 are arranged in a row along the width direction. Because the second terminals 820 are in the form of a flat plate whose thickness is smaller than its width, they can easily bend inward or outward as shown by H in Fig. 10. However, because the first-first protrusion 812A and the first-second protrusion 812B are arranged in a double row based on the radial direction, there is an advantage in that rigidity against bending is increased.

[0080] In addition, the horizontal cross section of second part 810B is larger than that of first part 810A, which advantageously enhances structural stability. In particular, the portion connecting first part 810A to second part 810B is formed with curved surface 804, which advantageously further enhances structural stability against bending.

[0081] Meanwhile, the horizontal cross section of the second part 810B is formed to be larger than that of the first hole 710, and the bottom surface of the second part 810B is positioned to completely cover the first hole 710, which has the advantage of preventing foreign matter from entering the gap between the end of the terminal of the bus bar 600 and the hole.

[0082] FIG. 11 is a plan view of the cover 700. As shown in FIG.

[0083] 3 and 11, the cover 700 may include a plurality of third holes 720 into which the first protrusions 812 are inserted. The third holes 720 are formed penetrating the upper and lower surfaces of the cover 700. The third holes 720 may be disposed adjacent to the first holes 710. The third holes 720 may include a 3-1 hole 721 and a 3-2 hole 722.

[0084] The 3-1 hole 721 may be disposed closer to the central axis C of the cover 700 than the 3-2 hole 722. The 3-1 hole 721 may be disposed so as not to overlap with the first hole 710 in the radial direction around the central axis C of the cover 700, and the 3-2 hole 722 may be disposed in an area S that overlaps with the first hole 710.

[0085] The position of the third hole 720 corresponds to the position of the first protrusion 812 .

[0086] Meanwhile, the cover 700 may have a plurality of bolt fastening holes 740 arranged therein.

[0087] FIG. 12 is a view illustrating a process of aligning the cover 700 and the housing 500, and FIG. 13 is a view illustrating a state in which the cover 700 and the housing 500 are coupled together.

[0088] 11 to 13, the cover 700 may include a plurality of fourth holes 730. The fourth holes 730 are formed to penetrate the top and bottom of the cover 700. The fourth holes 730 are used to align the first end 621 of the first terminal 620 and the second end 821 of the second terminal 820.

[0089] A plurality of fifth holes 510 are arranged in the housing 500. When the fourth hole 730 and the fifth hole 510 are aligned, the upper end of the second terminal 820 is aligned with the terminal of the housing cover or the terminal of the external power source.

[0090] With the power terminal unit 800 coupled to the cover 700, the pin P can be inserted through the fourth hole 730 of the cover 700 and into the fifth hole 510 of the housing 500 to reduce tolerance for the upper end position of the second terminal 820. With the pin P inserted into the fourth hole 730 and the fifth hole 510, the bolt V can be fastened into the bolt fastening hole 740 to fix the cover 700 to the housing 500. With the bolt V fastened, the pin P is removed.

[0091] Although the above-described embodiment has been described using an inner rotor motor as an example, the present invention is not limited to this. The present invention can also be applied to an outer rotor motor. Furthermore, the present invention can be used in a variety of devices, such as vehicles and home appliances.

Claims

1. shaft; a rotor coupled to the shaft; a stator disposed to correspond to the rotor; a bus bar disposed above the stator; a cover disposed over the bus bar; and a power terminal portion coupled to the cover and electrically connected to the bus bar; the busbar includes a first terminal; the power terminal portion includes a second body and a second terminal disposed in the second body, the cover includes a first hole, a first end of the first terminal disposed inside the second body through the first hole and a second end of the second terminal contact each other in the second body; the second body includes a first part disposed outside the second terminal and a second part extending downward from the first part; the first part includes a second hole; The first end and the second end are exposed to the outside through the second hole for fusing and overlap at the second hole.

2. the second body includes a second slot formed at a lower end of the second body; The motor of claim 1 , wherein a first end of the first terminal is inserted into the second slot.

3. the second body includes a second hole; The motor according to claim 1 , wherein the first end and the second end are arranged to contact each other at the second hole and are exposed to the outside by the second hole.

4. The motor according to claim 1 , wherein an embossment is disposed on the second end of the second terminal.

5. the cover includes a third hole; the second body includes a first part disposed outside the second terminal and a second part extending downward from the first part, The motor according to claim 1 , wherein the second part includes a first protrusion that is coupled to the third hole.

6. The size of the lower surface of the second part is larger than the size of the first hole, 4. The motor according to claim 1, wherein a lower surface of the second part is in contact with an upper surface of the cover and covers an entire area of ​​the first hole.

7. With reference to the radial direction of the central axis of the cover, At least some of the plurality of first protrusions are disposed at positions different from the rest, The motor according to claim 5 , wherein at least some of the plurality of third holes are arranged at positions different from the remaining third holes.

8. With the circumferential direction of the central axis of the cover as a reference, At least some of the first protrusions are disposed at different positions from one another, The motor according to claim 7 , wherein at least some of the third holes are arranged at different positions from each other.

9. the third holes include a 3-1 hole and a 3-2 hole, The 3-1 hole is disposed closer than the 3-2 hole, 6. The motor of claim 5, wherein the third-1 hole is arranged so as not to overlap with the first hole, and the third-2 hole is arranged so as to overlap with the first hole, based on a radial direction of the central axis of the cover.

10. The motor according to claim 1 , wherein one of the first end and the second end is disposed inside and the other is disposed outside, based on a radial direction of the central axis of the cover.

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