Motor

Abstract

The utility model discloses a motor, which comprises a motor shaft assembly, a rotary transformer assembly, a conducting ring and an end cover, and is characterized in that the rotary transformer assembly is positioned at one axial end of the motor shaft assembly and is connected with the motor shaft assembly through a fastener; the conductive ring is arranged on the periphery of the fastener in a sleeving mode and located on the side, away from the motor shaft assembly, of the rotary transformer assembly. The end cover is arranged on the side, away from the rotary transformer assembly, of the conducting ring, and the end cover abuts against the conducting ring. According to the motor provided by the utility model, the conductive ring is sleeved on one side of the fastener far away from the rotary transformer assembly, so that the conductive ring abuts against the surface of the end cover, and shaft current generated after the motor works for a long time can be grounded through a path of the motor shaft assembly-the fastener-the conductive ring-the end cover, so that the bearing is prevented from being electrically corroded, and the service life of the motor is prolonged. The space on the fastener is effectively utilized, the axial size of the motor can be reduced, the structure of the motor is more compact, and miniaturization design is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor. Background Art

[0002] Due to the imbalance of the motor stator magnetic field or the magnetism of the shaft itself, when alternating magnetic flux appears, voltage is induced between the two bearing ends of the motor or between the shaft and the bearing, forming a potential difference, and finally forming shaft current. After the motor has been used for a long time, when the bearing loses its insulation performance due to installation, oil pollution, damage or aging, the shaft current will break through the bearing oil film and produce discharge. The discharge will gradually deteriorate the oil quality, and electrical corrosion will occur at both ends of the bearing ball, which will seriously damage the bearing. In order to solve the problem of electrical corrosion of the bearing, it is usually adopted to install a conductive ring to conduct electricity into the ground.

[0003] In the related art, a conductive ring is usually installed between the motor shaft and the motor housing. At this time, the conductive ring will occupy the axial space of the motor shaft, which is not convenient for the arrangement of other components on the motor shaft. In addition, the axial dimension of the motor is large, which will increase the volume of the motor. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a motor that prevents electrical corrosion of the bearing while effectively utilizing the space on the fastener, can reduce the axial size of the motor, make the structure of the motor more compact, and facilitate miniaturization design.

[0005] The motor according to the embodiment of the utility model includes: a motor shaft assembly; a resolver assembly, the resolver assembly is located at one axial end of the motor shaft assembly, and the resolver assembly is connected to the motor shaft assembly via a fastener; a conductive ring, the conductive ring is sleeved on the outer periphery of the fastener, the conductive ring is located on a side of the resolver assembly away from the motor shaft assembly; an end cover, the end cover is located on a side of the conductive ring away from the resolver assembly, and the end cover abuts against the conductive ring.

[0006] According to the motor of the embodiment of the utility model, a conductive ring is arranged on the side of the fastener away from the rotary transformer assembly, and the conductive ring is stopped against the surface of the end cover, so that the shaft current generated by the motor after long-term operation can be grounded through the path of motor shaft assembly-fastener-conductive ring-end cover, thereby preventing electrical corrosion of the bearing and effectively utilizing the space on the fastener, which can reduce the axial size of the motor, make the structure of the motor more compact, and facilitate miniaturization design.

[0007] According to some embodiments of the utility model, the conductive ring includes a ring body and conductive fibers, the conductive fibers are arranged on the ring body, and the conductive fibers are interference fit with the fastener; a mounting groove is formed on one side of the end cover adjacent to the conductive ring, and the ring body is interference fit with the mounting groove.

[0008] According to some embodiments of the utility model, the fastener includes a first connecting section and a second connecting section connected to each other, the outer diameter of the first connecting section is smaller than the outer diameter of the second connecting section, the first connecting section passes through the rotational transformer assembly and is connected to the motor shaft assembly, and the conductive ring is sleeved on the outer periphery of the second connecting section; wherein, in the axial direction of the motor shaft assembly, the thickness of the second connecting section is greater than or equal to the thickness of the conductive ring.

[0009] According to some embodiments of the present invention, in the axial direction of the motor shaft assembly, a side surface of the second connecting segment away from the first connecting segment is flush with a side surface of the conductive ring away from the resolver assembly.

[0010] According to some embodiments of the present invention, in the axial direction of the motor shaft assembly, a side surface of the second connecting segment away from the first connecting segment protrudes out from a side surface of the conductive ring away from the resolver assembly.

[0011] According to some embodiments of the utility model, the motor further includes: a resolver shaft, one end of which extends into the motor shaft assembly and has an interference fit with the motor shaft assembly, the resolver assembly is sleeved on the other end of the resolver shaft, and the first connecting section is connected to the resolver shaft.

[0012] According to some embodiments of the utility model, the rotary shaft includes a first shaft segment and a second shaft segment connected to each other, the first shaft segment and the second shaft segment are both located on the outside of the motor shaft assembly, the outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment, and the rotary assembly is sleeved on the first shaft segment and abuts against the second shaft segment.

[0013] According to some embodiments of the utility model, the rotational shaft also includes: a third shaft segment, the third shaft segment is connected to the side of the second shaft segment away from the first shaft segment, the third shaft segment is interference fit with the motor shaft assembly, and the outer diameter of the third shaft segment is larger than that of the second shaft segment; a fourth shaft segment, the fourth shaft segment is connected to one end of the third shaft segment away from the second shaft segment, and the outer diameter of the fourth shaft segment is smaller than the outer diameter of the third shaft segment.

[0014] According to some embodiments of the present invention, a gasket is provided between the resolver assembly and the second connecting section, the first connecting section passes through the gasket and is connected to the resolver shaft, and the gasket abuts against the resolver assembly and the second connecting section respectively.

[0015] According to some embodiments of the utility model, the motor shaft assembly includes: a rotating shaft, a bearing, the bearing is sleeved on the outer periphery of the rotating shaft; an oil seal, the oil seal is sleeved on the outer periphery of the rotating shaft, and the oil seal is located between the bearing and the rotational transformer assembly.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is an exploded view of a motor according to an embodiment of the utility model;

[0019] Figure 2 It is a partial cross-sectional view of a motor according to an embodiment of the utility model.

[0020] Reference numerals:

[0021] 100: Motor:

[0022] 10: motor shaft assembly; 101: rotating shaft; 102: bearing; 103: oil seal; 20: resolver assembly; 30: fastener; 301: first connecting section; 302: second connecting section; 40: conductive ring; 401: ring body; 402: conductive fiber; 50: end cover; 501: mounting groove; 60: resolver shaft; 601: first shaft section; 602: second shaft section; 603: third shaft section; 604: fourth shaft section; 70: gasket. DETAILED DESCRIPTION

[0023] Reference below Figure 1-Figure 2 A motor 100 according to an embodiment of the present invention is described.

[0024] like Figure 1-Figure 2 As shown, the motor 100 according to the embodiment of the present invention includes: a motor shaft assembly 10 , a resolver assembly 20 , a conductive ring 40 and an end cover 50 .

[0025] Specifically, the resolver assembly 20 is located in the axial direction of the motor shaft assembly 10 (for example, Figure 1The rotary transformer assembly 20 is connected to the motor shaft assembly 10 through a fastener 30, and a conductive ring 40 is sleeved on the outer periphery of the fastener 30. The conductive ring 40 is located on a side of the rotary transformer assembly 20 away from the motor shaft assembly 10. The end cover 50 is located on a side of the conductive ring 40 away from the rotary transformer assembly 20, and the end cover 50 is stopped against the conductive ring 40.

[0026] For example, in Figure 1 and Figure 2 In the example, the motor shaft assembly 10, the resolver assembly 20, the fastener 30, the conductive ring 40 and the end cover 50 are sequentially arranged along the axial direction of the motor shaft assembly 10, that is, the resolver assembly 20, the fastener 30, the conductive ring 40 and the end cover 50 are located on the same side of the axial direction of the motor shaft assembly 10. During installation, one end of the fastener 30, such as a hexagon socket bolt, passes through the resolver assembly 20 to connect with the motor shaft assembly 10, and the conductive ring 40 is sleeved on the other end of the fastener 30. Then, the end cover 50 is installed and one side surface of the end cover 50 abuts against one side surface of the axial direction of the conductive ring 40 to clamp the conductive ring 40 between the resolver assembly 20 and the end cover 50, which effectively utilizes the space on the fastener 30, can reduce the axial dimension of the motor 100, make the structure of the motor 100 more compact, and facilitate miniaturization design.

[0027] It should be noted that the fastener 30 can be selected in different specifications according to actual use requirements. The different sizes of the fastener 30 can match the conductive ring 40 of different specifications. The size selection of the conductive ring 40 is not limited by the size of the motor shaft assembly 10.

[0028] When the motor 100 is working, the motor shaft assembly 10 rotates, driving the resolver assembly 20 to rotate, and the fastener 30 used to fix the resolver assembly 20 also rotates accordingly. At this time, the shaft current is grounded through the path of the motor shaft assembly 10-fastener 30-conductive ring 40-end cover 50, thereby protecting the bearing 102 of the motor 100 and preventing the bearing 102 from electrical corrosion.

[0029] According to the motor 100 of the embodiment of the utility model, the conductive ring 40 is sleeved on the side of the fastener 30 away from the rotary transformer assembly 20, and the conductive ring 40 is stopped against the surface of the end cover 50, so that the shaft current generated by the motor 100 after working for a long time can be grounded through the path of the motor shaft assembly 10-fastener 30-conductive ring 40-end cover 50, thereby preventing the bearing 102 from electrical corrosion and effectively utilizing the space on the fastener 30, which can reduce the axial size of the motor 100, make the structure of the motor 100 more compact, and facilitate miniaturization design.

[0030] According to some embodiments of the present invention, the conductive ring 40 includes a ring body 401 and conductive fibers 402, the conductive fibers 402 are arranged on the ring body 401, the conductive fibers 402 are interference fit with the fastener 30, and a mounting groove 501 is formed on one side of the end cap 50 adjacent to the conductive ring 40, for example, a portion of the surface of one side of the end cap 50 adjacent to the conductive ring 40 is recessed in a direction away from the conductive ring 40 to form the mounting groove 501, and the ring body 401 is interference fit with the mounting groove 501. Figure 2 The conductive fiber 402 is arranged inside the ring body 401, the conductive fiber 402 is located at the periphery of the fastener 30, and the conductive fiber 402 is in the shape of a brush. The ring body 401 is fixed on the end cover 50. When the motor 100 is working, the shaft current is transmitted to the fastener 30. When the fastener 30 rotates, the conductive fiber 402 will rub against the surface of the fastener 30 to transmit the shaft current to the conductive fiber 402. The shaft current on the conductive fiber 402 is transmitted to the end cover 50 through the ring body 401. The end cover 50 is grounded to transmit the shaft current to the ground, thereby preventing the bearing 102 of the motor shaft assembly 10 from electrical corrosion.

[0031] According to some specific embodiments of the present invention, Figure 2 As shown, the fastener 30 includes a first connecting section 301 and a second connecting section 302 connected to each other, the outer diameter of the first connecting section 301 is smaller than the outer diameter of the second connecting section 302, the first connecting section 301 passes through the rotary transformer assembly 20 and is connected to the motor shaft assembly 10, and the conductive ring 40 is sleeved on the outer periphery of the second connecting section 302. Among them, the thickness of the second connecting section 302 in the axial direction of the motor shaft assembly 10 is greater than or equal to the thickness of the conductive ring 40. In other words, the side surface of the second connecting section 302 away from the first connecting section 301 is flush with the side surface of the conductive ring 40 in the thickness direction, or the side surface of the second connecting section 302 away from the first connecting section 301 protrudes from the side surface of the conductive ring 40 in the thickness direction. In this way, the conductive ring 40 can be installed on the fastener 30 without increasing the axial size of the motor 100, so as to make the structure of the motor 100 compact.

[0032] Furthermore, in the axial direction of the motor shaft assembly 10, the side surface of the second connecting section 302 away from the first connecting section 301 is flush with the side surface of the conductive ring 40 away from the resolver assembly 20. With such a configuration, after the conductive ring 40 is fitted into the mounting groove 501 of the end cover 50, interference between the second connecting section 302 and the inner wall of the mounting groove 501 is avoided, thereby ensuring that the fastener 30 can rotate smoothly.

[0033] According to other embodiments of the present invention, in the axial direction of the motor shaft assembly 10, a side surface of the second connecting section 302 away from the first connecting section 301 protrudes from a side surface of the conductive ring 40 away from the resolver assembly 20. This arrangement ensures that there is sufficient space on the fastener 30 to install the conductive ring 40, thereby preventing the conductive ring 40 from being separated from the fastener 30.

[0034] According to some embodiments of the present invention, the motor 100 further includes a resolver shaft 60, one end of which extends into the motor shaft assembly 10 and is interference fit with the motor shaft assembly 10, the resolver assembly 20 is sleeved on the other end of the resolver shaft 60, and the first connecting section 301 is connected to the resolver shaft 60. Figure 1 and Figure 2 As shown, one end of the resolver shaft 60 can be interference fit with the inner hole of the motor shaft assembly 10 so that the resolver shaft 60 can rotate with the motor shaft assembly 10, and the resolver assembly 20 is sleeved on the other end of the resolver shaft 60 through the inner hole of its rotor, and one end of the first connecting section 301 passes through the resolver assembly 20 and is connected to the resolver shaft 60 to press the resolver assembly 20 onto the resolver shaft 60.

[0035] When the motor 100 is working, the motor shaft assembly 10 drives the resolver shaft 60 to rotate, and the resolver shaft 60 drives the fastener 30 to rotate, thereby driving the conductive fiber 402 of the conductive ring 40 to rotate. At this time, the shaft current is grounded through the path of the motor shaft assembly 10-resolver shaft 60-fastener 30-conductive fiber 402-ring body 401-end cover 50, thereby avoiding electrical corrosion of the bearing 102 of the motor shaft assembly 10.

[0036] Further, refer to Figure 1 and Figure 2 , the rotary shaft 60 includes a first shaft section 601 and a second shaft section 602 connected to each other, the first shaft section 601 and the second shaft section 602 are both located outside the motor shaft assembly 10, the outer diameter of the first shaft section 601 is smaller than the outer diameter of the second shaft section 602, and the rotary assembly 20 is sleeved on the first shaft section 601 and abuts against the second shaft section 602. That is to say, in the radial direction of the rotary shaft 60, the outer wall of the second shaft section 602 protrudes from the outer wall of the first shaft section 601. The second shaft section 602 can play a limiting role, preventing the rotary assembly 20 from moving toward the direction of the motor shaft assembly 10 when the rotary shaft 60 rotates, thereby avoiding abnormal noise when the motor 100 is working.

[0037] Furthermore, the rotary shaft 60 further includes a third shaft segment 603 and a fourth shaft segment 604, the third shaft segment 603 is connected to the side of the second shaft segment 602 away from the first shaft segment 601, the third shaft segment 603 is interference fit with the motor shaft assembly 10, the outer diameter of the third shaft segment 603 is larger than the second shaft segment 602, and the fourth shaft segment 604 is connected to the end of the third shaft segment 603 away from the second shaft segment 602. The fourth shaft segment 604, the third shaft segment 603, the second shaft segment 602 and the first shaft segment 601 are sequentially connected in a direction away from the motor shaft assembly 10, the third shaft segment 603 and the fourth shaft segment 604 are both located in the inner hole of the motor shaft assembly 10, and by making the third shaft segment 603 and the inner hole of the motor shaft assembly 10 interference fit, the rotary shaft 60 can be securely fixed on the motor shaft assembly 10. The outer diameter of the fourth shaft segment 604 is smaller than the outer diameter of the third shaft segment 603 , which can reduce the amount of material used and the weight of the motor 100 while ensuring the structural strength of the resolver shaft 60 .

[0038] According to some embodiments of the utility model, a gasket 70 is provided between the resolver assembly 20 and the second connecting section 302, the first connecting section 301 passes through the gasket 70 and is connected to the resolver shaft 60, and the gasket 70 is respectively abutted against the resolver assembly 20 and the second connecting section 302. Since the gasket 70 is elastic, the elastic properties of the gasket 70 can be used to make the fastener 30 press the resolver assembly 20 to ensure the stability of the position of the resolver assembly 20. Among them, the gasket 70 can be selected with different thicknesses according to actual use requirements to meet different axial size requirements.

[0039] According to some embodiments of the present invention, the motor shaft assembly 10 includes a rotating shaft 101, a bearing 102 and an oil seal 103, wherein the bearing 102 is sleeved on the outer periphery of the rotating shaft 101, the oil seal 103 is sleeved on the outer periphery of the rotating shaft 101, and the oil seal 103 is located between the bearing 102 and the rotary transformer assembly 20. Figure 2 As shown, the two sides of the oil seal 103 in the thickness direction are the bearing 102 and the rotary transformer assembly 20 respectively, so that there is sufficient oil at the bearing 102, that is, the oil film of the bearing 102 is guaranteed to be complete, so that the bearing 102 can work normally and have a longer service life.

[0040] Other structures and operations of the motor 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0041] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0044] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that: include: Motor shaft assembly; A resolver assembly, the resolver assembly is located at one axial end of the motor shaft assembly, and the resolver assembly is connected to the motor shaft assembly via a fastener; A conductive ring, which is sleeved on the outer periphery of the fastener and is located on a side of the resolver assembly away from the motor shaft assembly; An end cover is arranged on a side of the conductive ring away from the rotary transformer assembly, and the end cover abuts against the conductive ring.

2. The motor according to claim 1, characterized in that The conductive ring comprises a ring body and conductive fibers, wherein the conductive fibers are arranged on the ring body and are interference-fitted with the fastener; A mounting groove is formed on one side of the end cover adjacent to the conductive ring, and the ring body is interference-fitted with the mounting groove.

3. The motor according to claim 1, characterized in that The fastener comprises a first connecting section and a second connecting section connected to each other, the outer diameter of the first connecting section is smaller than the outer diameter of the second connecting section, the first connecting section passes through the rotary transformer assembly and is connected to the motor shaft assembly, and the conductive ring is sleeved on the outer periphery of the second connecting section; Wherein, in the axial direction of the motor shaft assembly, the thickness of the second connecting section is greater than or equal to the thickness of the conductive ring.

4. The motor according to claim 3, characterized in that In the axial direction of the motor shaft assembly, a side surface of the second connecting segment away from the first connecting segment is flush with a side surface of the conductive ring away from the resolver assembly.

5. The motor according to claim 3, characterized in that In the axial direction of the motor shaft assembly, a side surface of the second connecting segment away from the first connecting segment protrudes from a side surface of the conductive ring away from the resolver assembly.

6. The motor according to claim 3, characterized in that Also includes: A resolver shaft, one end of which extends into the motor shaft assembly and is interference fit with the motor shaft assembly, the resolver assembly is sleeved on the other end of the resolver shaft, and the first connecting section is connected to the resolver shaft.

7. The motor according to claim 6, characterized in that The rotary shaft includes a first shaft segment and a second shaft segment connected to each other, the first shaft segment and the second shaft segment are both located outside the motor shaft assembly, the outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment, and the rotary assembly is sleeved on the first shaft segment and abuts against the second shaft segment.

8. The motor according to claim 7, characterized in that The rotary shaft also includes: a third shaft segment, the third shaft segment being connected to a side of the second shaft segment away from the first shaft segment, the third shaft segment being interference fit with the motor shaft assembly, and the outer diameter of the third shaft segment being greater than that of the second shaft segment; A fourth shaft segment, wherein the fourth shaft segment is connected to an end of the third shaft segment away from the second shaft segment, and an outer diameter of the fourth shaft segment is smaller than an outer diameter of the third shaft segment.

9. The motor according to claim 6, characterized in that A gasket is provided between the rotary transformer assembly and the second connecting section, the first connecting section passes through the gasket and is connected to the rotary transformer shaft, and the gasket abuts against the rotary transformer assembly and the second connecting section respectively.

10. The motor according to any one of claims 1 to 9, characterized in that: The motor shaft assembly comprises: Axis, A bearing, wherein the bearing sleeve is arranged on the outer periphery of the rotating shaft; An oil seal is sleeved on the outer circumference of the rotating shaft and is located between the bearing and the rotary transformer assembly.

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