Novel electric corrosion prevention copper needle

Abstract

The utility model relates to the technical field of motors, in particular to a novel electric corrosion prevention copper needle which comprises a motor end cover, a jack is formed in the upper end of the motor end cover, a copper needle body is arranged in the jack, a conical copper head is fixedly connected to the lower end of the copper needle body, and the upper surface of the copper needle body is flush with the upper surface of the motor end cover. The motor end cover is formed by injection molding. According to the utility model, the head of the copper needle body is changed from an inverted V-shaped structure into a conical structure, after the motor end cover is assembled, the copper needle body can pierce a BMC thin-layer material in the jack, the matching size of the ejector pin hole of a mold and the copper needle is reduced, the risk of hole blocking by waste materials in the injection molding process is reduced, and the conductivity of the copper needle and the section of a stator iron core is effectively improved; and the shaft electric corrosion risk is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a novel anti-electrocorrosion copper needle. Background Art

[0002] The plastic-encapsulated brushless DC motor is injection molded with BMC material. The bearing chambers of the two end covers cannot be effectively connected through metal parts. At the same time, when the motor is running, a potential difference (shaft voltage) is generated between the inner and outer rings of the bearing.

[0003] Normally, the shaft voltage of the motor is low, and the lubricating oil film inside the bearing can act as an insulator, and no shaft current will be generated. Once a certain value is exceeded, the oil film is broken down, and discharge occurs, forming a current. The energy released by partial discharge generates high temperature, melting many tiny areas on the inner ring, outer ring or ball of the bearing, producing grooves, thereby increasing friction and causing bearing noise. The most notable feature of motor bearing electrocorrosion is the formation of dense grooves similar to "washboard" stripes on the inner and outer rings and balls of the motor bearing.

[0004] At present, the anti-electrolytic corrosion structures of various motor manufacturers on the market are different. Some are conducted through anti-electrolytic corrosion tape, some are conducted through internal conductive sheets, and some are metal copper needle structures. The manufacturing costs are also different. The current metal copper needle head is an inverted V-shaped structure. Since the jack is easily blocked by BMC waste during the injection molding process, and the copper needle head is an inverted V-shaped structure, the BMC material can be pressed into the V-shaped gap at this time, as shown in the attached manual. Figure 3 As shown, the conductivity between the front of the copper needle and the end face of the stator core is poor, affecting the anti-electrocorrosion effect. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and provides a novel anti-electrocorrosion copper needle.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A novel anti-electrocorrosion copper needle, comprising:

[0008] The motor end cover has a socket at the upper end, a copper needle body is arranged in the socket, a conical copper head is fixedly connected to the lower end of the copper needle body, the upper surface of the copper needle body is flush with the upper surface of the motor end cover, and the motor end cover is injection molded.

[0009] Preferably, it further comprises a BMC injection-molded shell and a stator core, wherein the stator core is installed inside the BMC injection-molded shell, and the lower surface of the conical copper head is in contact with the upper surface of the stator core.

[0010] Preferably, the BMC injection-molded shell and the motor end cover are assembled and connected.

[0011] The utility model has the following beneficial effects:

[0012] The head of the copper needle body is changed from an inverted V-shaped structure to a conical structure. After the motor end cover is assembled, the copper needle body can pierce the BMC thin layer in the socket. At the same time, the matching size of the mold ejector hole and the copper needle is reduced, reducing the risk of waste material blocking the hole during the injection molding process, effectively improving the conductivity of the copper needle and the stator core section, and effectively reducing the risk of shaft electrical corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a new type of anti-electrocorrosion copper needle proposed by the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the structure in which the motor end cover and the copper needle body are separated;

[0015] Figure 3 The invention relates to a structure of an anti-electrocorrosion copper needle in the prior art.

[0016] In the figure: 1. BMC injection molded shell; 2. Motor end cover; 3. Socket; 4. Copper needle body; 5. Conical copper head; 6. Stator core. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] Reference Figure 1-3 A new type of anti-electrocorrosion copper needle includes a motor end cover 2, a socket 3 is opened at the upper end of the motor end cover 2, a copper needle body 4 is arranged in the socket 3, a conical copper head 5 is fixedly connected to the lower end of the copper needle body 4, the upper surface of the copper needle body 4 is flush with the upper surface of the motor end cover 2, and the motor end cover 2 is injection molded.

[0019] like Figure 3 As shown, in the prior art, the head of the copper needle body 4 is an inverted V-shaped structure. Since the socket 3 is easily blocked by BMC waste during the injection molding process, and the head of the copper needle body 4 is an inverted V-shaped structure, the BMC material can be pressed into the V-shaped gap, resulting in poor conductivity between the copper needle body 4 and the end face of the stator core 6, affecting the anti-electrocorrosion effect.

[0020] The conical copper head 5 is fixed on the head of the copper needle body 4, that is, the head of the copper needle body 4 is changed from an inverted V-shaped structure to a conical structure. After the motor end cover 2 is assembled, the copper needle body 4 can pierce the BMC thin layer material in the jack 3, and at the same time reduce the matching size of the mold ejector hole and the copper needle, reduce the risk of waste material blocking the hole during the injection molding process, effectively improve the conductivity of the copper needle and the stator core section, and effectively reduce the risk of shaft electrical corrosion. Figure 1 shown.

[0021] It includes a BMC injection molded shell 1 and a stator core 6. The stator core 6 is installed inside the BMC injection molded shell 1. The lower surface of the conical copper head 5 fits with the upper surface of the stator core 6. The BMC injection molded shell 1 and the motor end cover 2 are assembled and connected. This is the existing technology and will not be described in detail here.

[0022] In the utility model, a conical copper head 5 is fixed on the head of the copper needle body 4, that is, the head of the copper needle body 4 is changed from an inverted V-shaped structure to a conical structure. After the motor end cover 2 is assembled, the copper needle body 4 can pierce the BMC thin layer material in the socket 3, and at the same time, the matching size of the ejector hole of the mold and the copper needle is reduced, thereby reducing the risk of waste material blocking the hole during the injection molding process, effectively improving the conductivity between the copper needle and the stator core section, and effectively reducing the risk of shaft electric corrosion.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of anti-electrolytic copper needle, characterized in that: include: A motor end cover (2), wherein a plug hole (3) is provided at the upper end of the motor end cover (2), a copper needle body (4) is provided in the plug hole (3), a conical copper head (5) is fixedly connected to the lower end of the copper needle body (4), the upper surface of the copper needle body (4) is flush with the upper surface of the motor end cover (2), and the motor end cover (2) is injection molded.

2. A novel anti-electrocorrosion copper needle according to claim 1, characterized in that: It also comprises a BMC injection-molded shell (1) and a stator core (6), wherein the stator core (6) is installed inside the BMC injection-molded shell (1), and the lower surface of the conical copper head (5) is in contact with the upper surface of the stator core (6).

3. A novel anti-electrocorrosion copper needle according to claim 2, characterized in that: The BMC injection-molded shell (1) and the motor end cover (2) are connected in an assembled manner.

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