motor

Abstract

The motor includes a housing including a partition wall separating a first space from a second space; a stator disposed in the first space; a rotor disposed in the stator; a shaft that rotates with the rotor and has a sensor magnet disposed at one end; and a printed circuit board disposed in the second space and has a position detection sensor disposed on one side thereof so as to face the sensor magnet in the vertical direction; and a shaft hole is disposed in the partition wall so as to pass through from one side to the other.

Description

[Technical field]

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

[0002] The following description is intended to provide background information for the present embodiment only and is not intended to describe the prior art.

[0003] A pump serves to deliver a certain amount of oil at a certain pressure. The oil circulated by the pump can be used to operate a hydraulic system that uses hydraulic pressure, or for cooling or lubrication purposes.

[0004] A mechanical oil pump (MOP) is an oil pump that is powered by mechanical power such as an engine.

[0005] In recent years, there has been a great deal of research into hybrid and electric vehicles in order to improve fuel economy and reduce carbon emissions.

[0006] Accordingly, there is an increasing demand for electric oil pumps (EOPs), which are pumps that are powered by motors, instead of mechanical oil pumps (MOPs), which are powered by machines such as engines.

[0007] The EOP may generally include a motor region, which includes a stator, a rotor, and a rotating shaft, and a pump region, which includes an inner rotor coupled to one end of the rotating shaft and receiving a rotational force from the rotating shaft, and an outer rotor housing the inner rotor.

[0008] In order to detect the position of the rotor or the rotating shaft, a magnet may be attached to an end of the rotating shaft. Also, a printed circuit board having a position detection sensor mounted thereon may be disposed in an area defined as a motor area. Thus, the position detection sensor detects a magnetic force generated by the magnet due to the rotation of the rotating shaft, thereby detecting the position of the rotating shaft.

[0009] Considering the structural characteristics of the pump, the printed circuit board must be disposed in an area separated from the area where the rotating shaft is disposed. However, as the distance between the magnet and the position sensor increases, the strength of the magnetic force decreases, which makes it difficult to accurately detect the rotational positions of the rotor and the rotating shaft. Summary of the Invention [Problem to be solved by the invention]

[0010] This embodiment provides a motor that can accurately detect the position of the rotation shaft by improving the structure, and can be made compact as a product. [Means for solving the problem]

[0011] In one embodiment, the motor includes a housing including a partition wall separating a first space from a second space; a stator disposed in the first space; a rotor disposed in the stator; a shaft that rotates with the rotor and has a sensor magnet disposed at one end; and a printed circuit board disposed in the second space and having a position detection sensor disposed on one side facing the sensor magnet in the vertical direction; and a shaft hole is disposed in the partition wall so as to penetrate from one side to the other side.

[0012] The position sensor may further include a sealing member having a lower surface contacting the partition wall and an upper surface having a receiving groove formed therein for receiving the position sensor.

[0013] The partition wall may include a first guide protruding upward from an upper surface thereof, and a second guide protruding upward from an upper surface of the first guide.

[0014] Also, an upper surface of the sensor magnet may be disposed lower than an upper surface of the second guide and higher than an upper surface of the partition wall.

[0015] In addition, the sealing member may include a first body disposed on a lower surface of the printed circuit board and a second body protruding downward from a lower surface of the first body, and the second body may be disposed inside the second guide.

[0016] In addition, a lower surface of the second body may contact an upper surface of the first guide.

[0017] Additionally, a side surface of the second main body can contact an inner surface of the second guide.

[0018] Additionally, a lower surface of the first body may contact an upper surface of the second guide.

[0019] Also, an inner circumferential surface of the shaft hole may be formed with an inclined surface such that a cross-sectional area increases downward.

[0020] In another embodiment, the motor includes a housing including a partition wall separating a first space from a second space; a stator disposed in the first space; a rotor disposed in the stator; a shaft that rotates with the rotor and has a sensor magnet disposed at one end; and a printed circuit board disposed in the second space and having a position detection sensor disposed on one side facing the sensor magnet in an up-down direction; a shaft hole is disposed in the partition wall so as to penetrate from one side to the other, and a sealing member is disposed between an inner surface of the shaft hole and the sensor magnet. Effect of the Invention

[0021] According to the present invention, since the distance between the sensor magnet and the position sensor is short, the positions of the rotor and the shaft can be detected more accurately.

[0022] In addition, since a part of the shaft arrangement area is compensated for through the shaft hole, there is an advantage that the product can be made compact. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view of a motor according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view showing the motor according to the first embodiment of the present invention from a different angle. [Diagram 3] 1 is a plan view illustrating the upper surface of a motor according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of a shaft hole according to a first embodiment of the present invention. [Diagram 5] FIG. 4 is a perspective view illustrating a top surface of a second space according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a perspective view illustrating a state in which the sealing member in FIG. 5 is joined; [Figure 7] 1 is a cross-sectional view illustrating a rotation sensing structure according to a first embodiment of the present invention. [Figure 8] FIG. 11 is a perspective view of a motor according to a second embodiment of the present invention. [Figure 9] FIG. 11 is a perspective view showing the motor according to the second embodiment of the present invention from a different angle. [Figure 10] FIG. 11 is a plan view illustrating the upper surface of a motor according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a perspective view illustrating a bottom surface of a second space according to a second embodiment of the present invention. [Figure 12] FIG. 5 is a perspective view of a rotation sensing structure according to a second embodiment of the present invention. [Figure 13] FIG. 5 is a cross-sectional view of a rotation sensing structure according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0025] However, the technical concept of the present invention is not limited to the embodiments described and may be realized in various different forms, and one or more of the components of the embodiments may be selectively combined or substituted within the scope of the technical concept of the present invention.

[0026] Furthermore, unless otherwise clearly and specifically defined, terms (including technical and scientific terms) used in the embodiments of the present invention are to be interpreted as meanings that are commonly understood by a person having ordinary knowledge in the technical field to which the present invention belongs, and commonly used terms such as predefined terms should be interpreted in light of the contextual meaning of the relevant art.

[0027] Furthermore, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0028] In this specification, the singular can include the plural unless otherwise specified in the context, and when referring to "A and (and) at least one (or more) of B and C," it can include one or more of all possible combinations of A, B, and C.

[0029] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of embodiments of the present invention.

[0030] Such terms are used only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the components.

[0031] Furthermore, when a component is described as being 'coupled', 'coupled' or 'connected' to another component, this includes not only the case where the component is directly coupled, coupled or connected to the other component, but also the case where the component is 'coupled', 'coupled' or 'connected' by another component between the component and the other component.

[0032] In addition, when described as being formed or disposed "above (above) or below (below)" each component, the above (above) or below (below) includes not only the case where two components are in direct contact with each other but also the case where one or more additional components are formed or disposed between the two components. In addition, when described as "above (above) or below (below)", it can include not only the above direction but also the below direction based on one component.

[0033] FIG. 1 is a perspective view of a motor according to a first embodiment of the present invention, FIG. 2 is a perspective view of the motor according to the first embodiment of the present invention from another angle, FIG. 3 is a plan view illustrating the top surface of the motor according to the first embodiment of the present invention, FIG. 4 is a cross-sectional view of a shaft hole according to the first embodiment of the present invention, FIG. 5 is a perspective view illustrating the top surface of a second space according to the first embodiment of the present invention, FIG. 6 is a perspective view illustrating the form in which a sealing member is combined in FIG. 5, and FIG. 7 is a cross-sectional view illustrating a rotation sensing structure according to the first embodiment of the present invention.

[0034] 1 to 7, the motor 100 according to the first embodiment of the present invention may have an outer shape formed by combining a housing 110 and a cover 200. The cover 200 may be combined with an upper surface of the housing 110.

[0035] A first space 111 may be formed in the housing 110 to accommodate the stator 120, a rotor (not shown), and a shaft 180. A separate cover (not shown) may be coupled to a lower surface of the housing 110 to cover the lower surface of the housing 110. The separate inner space of the housing defines the first space 111.

[0036] The stator 120, the rotor (not shown), and the shaft 180 may be disposed in the first space 111. The stator 120 may include a stator core 122 and a coil 124 wound around the stator core 122. An insulator (not shown) may be disposed on an outer surface of the stator core 122 so that the coil 124 is wound around the insulator.

[0037] A rotor having a shaft coupled to its center may be disposed inside the stator 120. The rotor may include a rotor core and a magnet. Therefore, when a current is applied to the coil, the shaft may rotate together with the rotor due to electromagnetic interaction between the coil and the magnet. A bearing 186 for supporting the rotation of the shaft 180 may be disposed in the first space 111.

[0038] A second space 118 may be formed on the upper surface of the housing 110 to accommodate a printed circuit board 190. The second space 118 may be recessed below other regions of the upper surface of the housing 110. The second space 118 may be separated from other regions by an end 119. When the cover 200 is coupled to the upper surface of the housing 110, the second space 118 may be covered from an external region.

[0039] The printed circuit board 190 may be disposed in the second space 118. A number of electronic components for driving the motor 100 may be disposed on the printed circuit board 190. A position detection sensor 192, which will be described later, may be disposed on the printed circuit board 190.

[0040] The first space 111 and the second space 118 may be partitioned by a partition wall 140. A lower surface of the partition wall 140 may form an upper surface of the first space 111. An upper surface of the partition wall 140 may form a bottom surface of the second space 118.

[0041] A terminal 130 may be disposed on a bottom surface of the second space 118 through the partition wall 140. The terminal 130 may electrically couple the printed circuit board 190 and the coil 124.

[0042] Meanwhile, a sensor magnet 182 may be disposed at one end of the shaft 180 in order to sense the positions of the rotor and the shaft 180. The sensor magnet 182 may be coupled to an upper end of the shaft 180. The sensor magnet 182 may be coupled to an outer circumferential surface of the upper end of the shaft 180.

[0043] A position detection sensor 192 may be disposed on a lower surface of the printed circuit board 190 facing the sensor magnet 182. The position detection sensor 192 and the sensor magnet 182 may be disposed to face each other in the vertical direction. The position detection sensor 192 may detect the position of the shaft 180 by detecting a magnetic force generated from the sensor magnet 182. The position detection sensor 192 is a three-axis linear sensor capable of detecting positions in the X-axis, Y-axis, and Z-axis directions, and may detect the position of the shaft 180 by linearly converting two sensing values ​​among the measured values. The position detection sensor 192 may include a Hall sensor. The sensor magnet 182 and the position detection sensor 192 may be spaced apart from each other by 1.0 mm or less.

[0044] An upper surface of the sensor magnet 182 may be disposed higher than an upper surface of the partition wall 140. An upper surface of the sensor magnet 182 may be disposed higher than a bottom surface of the second space 118.

[0045] A shaft hole 150 may be formed in the partition 140 so that at least a portion of the shaft 180 passes through the partition 140 from the upper surface to the lower surface. A portion of an upper end of the shaft 180 may be disposed inside the shaft hole 150 through the shaft hole 150. Since the sensor magnet 182 is disposed at the upper end of the shaft 180, the sensor magnet 182 and the position detection sensor 192 may be disposed relatively close to each other through the shaft hole 150.

[0046] In detail, the upper surface of the partition wall 140 may include a first guide 152 protruding upward and having the shaft hole 150 disposed inside thereof, and a second guide 154 protruding upward from the upper surface of the first guide 152. The first guide 152 and the second guide 154 may be formed to have a step. The first guide 152 may be disposed inside the second guide 154. The upper surface of the second guide 154 may be formed higher than the upper surface of the first guide 152. The upper end of the shaft 180 and the upper surface of the sensor magnet 182 may be disposed lower than the upper surface of the first guide 152.

[0047] The inner circumferential surface of the shaft hole 150 may have an inclined surface 156 so that the cross-sectional area becomes wider as it goes downward. Alternatively, the inner circumferential surface of the shaft hole 150 may have a curved surface so that the cross-sectional area becomes wider as it goes downward. Thus, when the shaft 180 is assembled in the housing 110, the shaft 180 can be easily guided into the shaft hole 150.

[0048] A sealing member 220 may be disposed on a lower surface of the printed circuit board 190. An upper surface of the sealing member 220 may be coupled to a lower surface of the printed circuit board 190 and a lower surface of the sealing member 220 may be coupled to an upper surface of the partition wall 140. The sealing member 220 may be disposed to enclose the position detection sensor 192.

[0049] More specifically, the sealing member 220 may include a first body 224 coupled to a lower surface of the printed circuit board 190, and a second body 226 protruding downward from a lower surface of the first body 224 and disposed inside the second guide 154. The cross-sectional area of ​​the second body 226 may be smaller than the cross-sectional area of ​​the first body 224.

[0050] A lower surface of the second body 226 may contact an upper surface of the first guide 152. A side surface of the second body 226 may contact an inner surface of the second guide 154. A lower surface of the first body 224 may contact an upper surface of the second guide 154. With the above structure, the first space 111 and the second space 118 may be sealed from each other by the sealing member 220.

[0051] Meanwhile, a receiving groove 222 for receiving the position detection sensor 192 may be formed on the inner sides of the first body 224 and the second body 226. That is, the receiving groove 222 may be formed at the center of the upper surface of the sealing member 220 to be recessed downwardly from other regions.

[0052] The sealing member 220 may be made of a rubber or resin material.

[0053] According to the above-mentioned structure, since the distance between the comparison sensor magnet and the position detection sensor is short, the positions of the rotor and the shaft can be detected more accurately.

[0054] In addition, since a part of the shaft arrangement area is compensated for through the shaft hole, there is an advantage that the product can be made compact.

[0055] The motor according to the second embodiment will be described below. FIG. 8 is a perspective view of a motor according to a second embodiment of the present invention, FIG. 9 is a perspective view of the motor according to the second embodiment of the present invention from another angle, FIG. 10 is a plan view illustrating the top surface of the motor according to the second embodiment of the present invention, FIG. 11 is a perspective view illustrating the bottom surface of the second space according to the second embodiment of the present invention, FIG. 12 is a perspective view of a rotation sensing structure according to the second embodiment of the present invention, and FIG. 13 is a cross-sectional view of the rotation sensing structure according to the second embodiment of the present invention.

[0056] 8 to 13, the motor 300 according to the second embodiment of the present invention may have an outer shape formed by combining a housing 310 and a cover 500. The cover 500 may be combined with an upper surface of the housing 310.

[0057] A first space 311 may be formed in the housing 310 to accommodate a stator 320, a rotor (not shown), and a shaft 380. A separate cover (not shown) may be coupled to a lower surface of the housing 310 to cover a lower surface of the housing 110. The separate space within the housing may be separated from the first space 311.

[0058] The stator 320, the rotor (not shown), and the shaft 380 may be disposed in the first space 311. The stator 320 may include a stator core 322 and a coil 324 wound around the stator core 322. An insulator (not shown) may be disposed on an outer surface of the stator core 322 so that the coil 324 is wound therearound.

[0059] A rotor having a shaft 380 coupled to its center may be disposed inside the stator 320. The rotor may include a rotor core and a magnet. Therefore, when a current is applied to the coil, the shaft 380 may rotate together with the rotor due to electromagnetic interaction between the coil and the magnet. A bearing 386 for supporting the rotation of the shaft 380 may be disposed in the first space 311.

[0060] A second space 318 may be formed on the upper surface of the housing 310 to accommodate a printed circuit board 390. The second space 318 may be recessed below other regions of the upper surface of the housing 310. The second space 318 may be separated from other regions by an end 317. When the cover 500 is coupled to the upper surface of the housing 310, the second space 318 may be covered from an external region.

[0061] The printed circuit board 390 may be disposed in the second space 318. A number of electronic components for driving the motor 300 may be disposed on the printed circuit board 390. A position detection sensor 392, which will be described later, may be disposed on the printed circuit board 390.

[0062] The first space 311 and the second space 318 may be partitioned by a partition 340. A lower surface of the partition 340 may form an upper surface of the first space 311. An upper surface of the partition 340 may form a bottom surface of the second space 318.

[0063] A terminal 330 may be disposed on a bottom surface of the second space 318 through the partition wall 340. The terminal 330 may electrically couple the printed circuit board 390 and the coil 324.

[0064] Meanwhile, a sensor magnet 382 may be disposed at one end of the shaft 380 in order to sense the positions of the rotor and the shaft 380. The sensor magnet 382 may be coupled to an upper end of the shaft 380. The sensor magnet 382 may be coupled to an outer circumferential surface of the upper end of the shaft 380.

[0065] A magnet cover 386 may be disposed on an upper end of the shaft 380 to enclose the sensor magnet 382. The magnet cover 386 may be coupled to the upper end of the shaft 380 and accommodate the sensor magnet 382 therein. A through hole 387 is formed in the magnet cover 386, penetrating from the upper surface to the lower surface, and the sensor magnet 382 may be disposed to face the position detection sensor 392 in the vertical direction.

[0066] A position detection sensor 392 may be disposed on a lower surface of the printed circuit board 390 facing the sensor magnet 382. The position detection sensor 392 and the sensor magnet 382 may be disposed to face each other in the vertical direction. The position detection sensor 392 may detect the position of the shaft 380 by detecting a magnetic force generated from the sensor magnet 382. The position detection sensor 392 is a three-axis linear sensor capable of detecting positions in the X-axis, Y-axis, and Z-axis directions, and may detect the position of the shaft 380 by linearly converting two sensing values ​​among the measured values. The position detection sensor 392 may include a Hall sensor. The sensor magnet 382 and the position detection sensor 392 may be spaced apart from each other by 1.0 mm or less.

[0067] An upper surface of the sensor magnet 382 may be disposed higher than a lower surface of the partition wall 340. An upper surface of the sensor magnet 382 may be flush with a bottom surface of the second space 318 or may be disposed higher than the bottom surface of the second space 318.

[0068] A shaft hole 342 may be formed in the partition 340 so that at least a portion of the shaft 380 passes through the partition 340 from the upper surface to the lower surface. A portion of an upper end of the shaft 380 may be disposed inside the shaft hole 342 through the shaft hole 342. The sensor magnet 382 is disposed at the upper end of the shaft 380, so that the sensor magnet 382 and the position detection sensor 392 may be disposed relatively close to each other through the shaft hole 342.

[0069] A sealing member 400 may be disposed inside the shaft hole 342. The sealing member 400 may be disposed such that an outer circumferential surface thereof contacts an inner circumferential surface of the shaft hole 342 and a portion of the inner circumferential surface presses a portion of the outer circumferential surface of the shaft 380. The sealing member 400 is made of a rubber material and can seal the first space 311 and the second space 318 from each other.

[0070] In detail, the sealing member 400 may have a ring-shaped cross section with a hole 420 formed in the center. A rib 412 at least a portion of which protrudes outward may be formed on an outer circumferential surface of the sealing member 400. The rib 412 may be disposed at a lower end of the outer circumferential surface of the sealing member 400.

[0071] A rib groove 346 may be disposed in an area facing the rib 412 on the inner circumferential surface of the shaft hole 342, the rib groove 346 being recessed outward from other areas. Thus, the rib 412 may be coupled to the rib groove 346. As a result, the sealing member 400 may be firmly fixed in the shaft hole 342.

[0072] A pressure portion 414 protruding inward from other regions may be formed on an inner peripheral surface of the sealing member 400. The pressure portion 414 may be in contact with an outer peripheral surface of the shaft 380. The pressure portion 414 may be formed to press an outer surface of the magnet cover 386. As a result, no gap is generated between the magnet cover 386 and the sealing member 400, so that the first space 311 and the second space 318 may be sealed from each other.

[0073] An inclined surface 416 having a cross-sectional area that decreases downward may be formed on the inner surface of the pressing part 414. As a result, the remaining area of ​​the pressing part 414 except for the lower end may be spaced apart from the outer surface of the magnet cover 386. That is, the contact area between the sealing member 400 and the shaft 380 may be relatively small, thereby improving the rotation efficiency of the shaft 380.

[0074] A protrusion 344 protruding upward from other regions may be formed at an end region of the arrangement region of the shaft hole 342 in the upper surface of the partition wall 340. Thus, the shaft hole 342 may be arranged inside the protrusion 344. As a result, the upper end of the shaft 380 may be arranged relatively higher than other regions of the upper surface of the partition wall 340, so that the distance between the sensor magnet 382 and the position detection sensor 392 may be closer.

[0075] The upper surface of the protrusion 344 may be formed to protrude upward as it approaches the shaft hole 342 in a radial direction. The upper surface of the protrusion 344 may be curved.

[0076] According to the above-mentioned structure, since the distance between the comparison sensor magnet and the position detection sensor is short, the positions of the rotor and the shaft can be detected more accurately.

[0077] In addition, since a part of the shaft arrangement area is compensated for through the shaft hole, there is an advantage that the product can be made compact.

[0078] Although it has been described above that all components constituting the embodiments of the present invention are combined or operated in combination, the present invention is not necessarily limited to such an embodiment. That is, all components may be selectively combined and operated in combination within the scope of the present invention. Furthermore, the terms 'comprise', 'comprise', 'have', etc. described above mean that the corresponding components can be contained, unless otherwise specified to the contrary, and therefore should be interpreted as including other components, not excluding other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as predefined terms, should be interpreted as being consistent with the contextual meaning of the relevant art, and should not be interpreted as being ideal or overly formal unless expressly defined in the present invention.

[0079] The above description is merely illustrative of the technical idea of ​​the present invention, and various modifications and variations may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are for illustrative purposes only and are not intended to limit the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by such embodiments. The scope of protection of the present invention should be interpreted according to the following claims, and all technical ideas within the equivalent range should be interpreted as being included in the scope of the present invention.

Claims

1. a housing including a partition wall that divides a first space and a second space; a stator disposed within the first space; a rotor disposed within the stator; a shaft rotating with said rotor and having a sensor magnet disposed at one end; a printed circuit board disposed in the second space, the printed circuit board having a position detection sensor disposed on one surface thereof so as to face the sensor magnet in the vertical direction; A shaft hole is arranged in the partition wall so as to penetrate from one surface to the other surface, At least a portion of the shaft is disposed in the shaft hole; a sealing member having a lower surface contacting the partition wall and an upper surface having a receiving groove in which the position detection sensor is disposed, The partition includes a first guide protruding upward from an upper surface thereof, and a second guide protruding upward from an upper surface of the first guide.

2. The motor of claim 1 , wherein an upper surface of the sensor magnet is disposed lower than an upper surface of the second guide and higher than an upper surface of the partition wall.

3. the sealing member includes a first body disposed on a lower surface of the printed circuit board, and a second body protruding downward from a lower surface of the first body, The motor of claim 1 , wherein the second body is disposed inside the second guide.

4. The motor of claim 3 , wherein a lower surface of the second body contacts an upper surface of the first guide.

5. The motor of claim 3 , wherein a side surface of the second body contacts an inner surface of the second guide.

6. The motor of claim 3 , wherein a lower surface of the first body contacts an upper surface of the second guide.

7. The motor according to claim 1 , wherein an inner circumferential surface of the shaft hole is formed with an inclined surface such that a cross-sectional area increases downward.

8. a housing including a partition wall that divides a first space and a second space; a stator disposed within the first space; a rotor disposed within the stator; a shaft rotating with said rotor and having a sensor magnet disposed at one end; a printed circuit board disposed in the second space, the printed circuit board having a position detection sensor disposed on one surface thereof so as to face the sensor magnet in the vertical direction; The partition has a shaft hole extending from one side to the other side, a sealing member is disposed between an inner circumferential surface of the shaft hole and the sensor magnet; The partition includes a first guide protruding upward from an upper surface thereof, and a second guide protruding upward from an upper surface of the first guide.

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