Motor shaft current conduction structure

Abstract

The utility model relates to the technical field of motors, in particular to a motor shaft current conduction structure, which comprises a motor end cover, a motor shaft is arranged in the middle of the motor end cover, the motor shaft is rotatably connected with the motor end cover through a bearing, a mounting ring is clamped on the bottom surface of the outer end of the motor end cover, and carbon fibers are arranged on the mounting ring. The inner ends of the carbon fibers make contact with the motor shaft, and the carbon fibers are pressed and fixed through a conductive pressing plate. Carbon fibers are installed on a motor end cover, the carbon fibers and a motor shaft are continuously kept in a contact state, a conductive pressing plate is adopted to press the carbon fibers, the carbon fibers are fixed, conduction of a bearing inner ring and a bearing outer ring is achieved through conductive parts such as the carbon fibers, the conductive pressing plate and the end cover, and therefore the bearing is prevented from generating shaft current corrosion, and the service life of the bearing is prolonged. Meanwhile, the production cost is reduced.

Description

Technical Field

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

[0002] For a permanent magnet synchronous motor and a three-phase asynchronous motor driven by an inverter, the common-mode voltage generated may cause a discharge phenomenon between the raceway and the balls of the bearing, resulting in electrical corrosion of the bearing and damage to the bearing. To solve this problem, currently, ceramic ball bearings or insulation of the inner ring or outer ring of the bearing are usually used to avoid shaft current corrosion of the bearing; however, these methods usually have high costs or cannot effectively solve the problem of shaft current. Therefore, we propose a motor shaft current conduction structure to solve the above problems. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the drawback that for a permanent magnet synchronous motor and a three-phase asynchronous motor driven by an inverter in the prior art, the common-mode voltage generated may cause a discharge phenomenon between the raceway and the balls of the bearing, resulting in electrical corrosion of the bearing and damage to the bearing, and to propose a motor shaft current conduction structure.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A motor shaft current conduction structure includes a motor end cover. A motor shaft is arranged in the middle of the motor end cover. The motor shaft is rotationally connected with the motor end cover through a bearing. An installation ring is clamped at the bottom surface of the outer end of the motor end cover. Carbon fiber is arranged on the installation ring. The inner end of the carbon fiber contacts the motor shaft, and the carbon fiber is tightly fixed through a voltage-conducting plate.

[0006] As a preferred technical scheme of the utility model, a clamping groove is opened at the bottom of the motor end cover. The installation ring is embedded in the clamping groove, so that the installation ring is lower than the outer end surface of the motor end cover.

[0007] As a preferred technical scheme of the utility model, an installation groove for installing the voltage-conducting plate is arranged at the bottom of the motor end cover. The voltage-conducting plate is fixed on the motor end cover through screws. The voltage-conducting plate is detachably connected with the motor end cover. By disassembling the voltage-conducting plate, the installation ring and the carbon fiber can be taken out.

[0008] As a preferred technical scheme of the utility model, the carbon fiber is annularly distributed on the inner side of the installation ring, and the carbon fiber is sleeved on the motor shaft.

[0009] The beneficial effects of the utility model are:

[0010] By installing carbon fiber on the motor end cover, the carbon fiber and the motor shaft are kept in continuous contact, and a conductive pressure plate is used to press the carbon fiber to fix it. The conduction between the inner ring and the outer ring of the bearing is achieved through the conductive parts such as the carbon fiber, the conductive pressure plate and the end cover, thus avoiding the corrosion of the shaft current of the bearing and reducing the production cost at the same time. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of a structure for conducting shaft current of a motor proposed by the present utility model;

[0012] Figure 2 It is a schematic structural diagram of a cross-section of a structure for conducting shaft current of a motor proposed by the present utility model.

[0013] In the figure: 1, motor end cover; 2, motor shaft; 3, mounting ring; 4, carbon fiber; 5, conductive pressure plate; 6, bearing. Detailed Implementation Manner

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0015] Referring to Figure 1-2 , a structure for conducting shaft current of a motor includes a motor end cover 1. A motor shaft 2 is arranged in the middle of the motor end cover 1. The motor shaft 2 is rotatably connected to the motor end cover 1 through a bearing 6. The connection between the motor shaft 2 and the motor end cover 1 is a conventional connection method.

[0016] Among them, a mounting ring 3 is clamped at the bottom surface of the outer end of the motor end cover 1. A clamping groove is opened at the bottom of the motor end cover 1. The mounting ring 3 is embedded in the clamping groove so that the mounting ring 3 is lower than the outer end surface of the motor end cover 1. Carbon fiber 4 is arranged on the mounting ring 3. The carbon fiber 4 is annularly distributed on the inner side of the mounting ring 3. The carbon fiber 4 is sleeved on the motor shaft 2. The inner end of the carbon fiber 4 is in contact with the motor shaft 2, and the carbon fiber 4 is tightly fixed by a conductive pressure plate 5.

[0017] Secondly, an installation groove for installing the conductive pressure plate 5 is arranged at the bottom of the motor end cover 1. The conductive pressure plate 5 is fixed on the motor end cover 1 by screws. The conductive pressure plate 5 is detachably connected to the motor end cover 1. By disassembling the conductive pressure plate 5, the mounting ring 3 and the carbon fiber 4 can be taken out.

[0018] In this embodiment: By installing the carbon fiber 4 on the motor end cover 1, the carbon fiber 4 and the motor shaft 2 are kept in continuous contact, and the carbon fiber 4 is fixed by pressing the carbon fiber 4 with the conductive pressure plate 5. The conduction between the inner and outer rings of the bearing 6 is realized through these conductive parts such as the carbon fiber 4, the conductive pressure plate 5 and the motor end cover 1, so as to avoid the corrosion of the bearing 6 caused by shaft current and reduce the production cost at the same time;

[0019] This structure is simple, compact, low in cost, convenient to operate, and high in reliability. No electro-corrosion phenomenon will occur even when using conventional ordinary bearing steel bearings. This structure can be applied not only to DC motors but also to AC motors driven by inverters, and is applicable to various application scenarios where electro-corrosion of bearings occurs.

[0020] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A conduction structure for the shaft current of a motor, comprising a motor end cover (1), a motor shaft (2) is arranged in the middle of the motor end cover (1), and the motor shaft (2) is rotatably connected to the motor end cover (1) through a bearing (6), characterized in that, An installation ring (3) is snap-connected to the bottom surface of the outer end of the motor end cover (1). Carbon fiber (4) is provided on the installation ring (3). The inner end of the carbon fiber (4) contacts the motor shaft (2), and the carbon fiber (4) is tightly fixed by a voltage-conducting pressing plate (5).

2. The motor shaft current conduction structure according to claim 1, wherein, A snap-connection groove is formed at the bottom of the motor end cover (1), and the installation ring (3) is embedded in the snap-connection groove.

3. The conduction structure of the motor shaft current according to claim 1, wherein An installation groove for installing the voltage-conducting pressing plate (5) is provided at the bottom of the motor end cover (1), and the voltage-conducting pressing plate (5) is fixed to the motor end cover (1) by screws.

4. A motor shaft current conduction structure according to claim 1, characterized in that The carbon fiber (4) is annularly distributed inside the installation ring (3).

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