Integrated insulation and current-break positioning assembly for synchronous machines

Abstract

The application relates to a synchronous motor integrated insulation cut-off positioning assembly for assisting motor positioning and installation of a first positioning pin hole on a motor bottom plate, which comprises a positioning seat and a positioning pin, the positioning seat is fixedly installed on the motor bottom plate, a second positioning pin hole is formed in the positioning seat, the second positioning pin hole is coaxial with the first positioning pin hole, the positioning pin is provided with a matching section and a positioning section, the matching section is inserted into the second positioning pin hole and the first positioning pin hole, and the matching section penetrates through the motor bottom plate, the positioning section is exposed to the outside of the side of the positioning seat far from the motor bottom plate and is used for positioning and installing the motor, an insulation layer is arranged on the outer wall of the matching section of the positioning pin, the inner wall of the second positioning pin hole and the side end face of the positioning seat far from the motor bottom plate, the positioning assembly can realize positioning and installation of the motor, can realize cut-off of the circuit between the motor and the motor bottom plate, and can weaken shaft current and electric erosion of the shaft and the bearing.

Description

Technical Field

[0001] This invention relates to the field of motor assembly technology, specifically to an integrated insulation interruption and positioning assembly for synchronous motors. Background Technology

[0002] In modern industry, electric motors are widely used as core power equipment in various mechanical systems. However, motors are often troubled by shaft current problems during operation, especially variable frequency drive (VFD) motors. High-frequency switching operations generate common-mode voltage, which in turn leads to shaft voltage and shaft current. When shaft current passes through the bearing, it causes electro-erosion (EE), resulting in pits, grooves, and other damage to the bearing raceway and rolling element surfaces, reducing bearing life, increasing equipment failure rate, and maintenance costs. Currently, common solutions to shaft current include using insulated bearings, installing grounded carbon brushes, or shaft current diversion devices. However, in some cases, shaft current may still be conducted through the bearing housing, exacerbating the risk of bearing EE. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides an integrated insulation interruption and positioning assembly for a synchronous motor, used for positioning and mounting the motor on a motor base plate, wherein a first positioning pin hole is provided on the motor base plate, and the integrated insulation interruption and positioning assembly for a synchronous motor includes: A positioning seat is fixedly installed on the motor base plate. The positioning seat has a second positioning pin hole inside. When the positioning seat is installed on the motor base plate, the second positioning pin hole is coaxial with the first positioning pin hole. An insulating layer is provided on the inner wall of the second positioning pin hole and on the side of the positioning seat away from the motor base plate. The positioning pin has a mating section and a positioning section. The mating section is inserted into the second positioning pin hole and the first positioning pin hole. The positioning section is exposed on the outside of the positioning seat away from the motor base plate. It is used for positioning and installing the motor. An insulating layer is provided on the outer wall of the mating section of the positioning pin.

[0004] Preferably, the second positioning pin hole is a stepped hole, which has a first hole section near the motor base plate and a second hole section away from the motor base plate. The diameter of the first hole section is smaller than the diameter of the second hole section. The mating section of the positioning pin is stepped, which has a first shaft section near the motor base plate and a second shaft section away from the motor base plate. The diameter of the first shaft section is smaller than the diameter of the second shaft section. The outer diameter of the first shaft section matches the inner diameter of the first hole section. When the positioning pin is installed in the positioning seat, the stepped surface of the positioning pin abuts against the stepped surface of the second positioning pin hole.

[0005] Preferably, a countersunk groove is also provided outside the first positioning pin hole on the motor base plate, and the diameter of the countersunk groove is larger than the diameter of the first positioning pin hole. The outer contour of the positioning seat is stepped. The positioning seat includes an embedded section and an overlapping section. The embedded section is embedded in the countersunk groove. The stepped surface at the bottom of the overlapping section abuts against the outer end face of the countersunk groove. The overlapping section is fixed to the outer end face of the countersunk groove by welding.

[0006] Preferably, an annular sealing groove is formed on the stepped surface at the bottom of the overlapping section, and a sealing gasket is installed in the sealing groove.

[0007] Preferably, there is an adjustment gap between the inner wall of the countersunk groove and the outer wall of the embedded section. Based on the adjustment gap, the embedded section can move radially within the countersunk groove to align the first positioning pin hole with the second positioning pin hole.

[0008] Preferably, the mating section of the positioning pin penetrates the motor base plate, and a guide groove is provided on the mating section. The two ends of the guide groove are located outside the first positioning pin hole and the second positioning pin hole. The width of the guide groove is 0.1mm to 0.5mm, the depth is 0.5mm to 2mm, and the inner wall of the guide groove is provided with guide texture 1.

[0009] Preferably, the insulating layer comprises, from the inside out, a mica tape, an anaerobic adhesive layer, and a moisture-proof sealing layer.

[0010] Preferably, the mica tape is installed using a semi-overlapping winding method, with a total thickness of 0.1mm to 0.3mm. The anaerobic adhesive layer is coated on the mica tape, the moisture-proof sealing layer is made of polytetrafluoroethylene coating or silicone rubber layer, and the overall thickness of the insulation layer is 0.3mm to 1.2mm.

[0011] Preferably, the positioning section of the positioning pin is provided with an external thread, which is used to install a lock nut. The lock nut is used to lock and fix the motor to the positioning pin after the motor is positioned and installed on the positioning pin.

[0012] Preferably, the end of the positioning segment is further provided with an operating end.

[0013] This invention provides an integrated insulating current-cutting positioning assembly for synchronous motors, used to assist in the positioning and installation of a motor in a first positioning pin hole on a motor base plate. The assembly includes a positioning seat and a positioning pin. The positioning seat is fixedly installed on the motor base plate, and a second positioning pin hole is formed inside the positioning seat. The second positioning pin hole is coaxial with the first positioning pin hole. The positioning pin has a mating section and a positioning section. The mating section is inserted into both the second and first positioning pin holes and penetrates the motor base plate. The positioning section is exposed on the outer side of the positioning seat away from the motor base plate. Insulation layers are provided on the outer wall of the mating section of the positioning pin, the inner wall of the second positioning pin hole, and the end face of the positioning seat away from the motor base plate. By coating the positioning pin and corresponding parts of the positioning seat with insulation layers, the positioning assembly can achieve the positioning and installation of the motor, while simultaneously isolating the circuit between the motor and the motor base plate, thereby reducing shaft current and electrolytic corrosion of the shaft and bearings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the integrated insulation interruption and positioning component for synchronous motors provided in this embodiment of the invention after it has been installed on the motor base plate; Figure 2 This is a schematic diagram of the overall structure of the integrated insulation interruption and positioning component for synchronous motors provided in an embodiment of the present invention; Figure 3 yes Figure 1 Sectional view of section AA; Figure 4 This is a schematic diagram of the positioning seat of the integrated insulation interruption positioning assembly for synchronous motors provided in an embodiment of the present invention; Figure 5 yes Figure 4 A sectional view; Figure 6 This is a top view of the positioning pin of the integrated insulation interruption positioning assembly for synchronous motors provided in an embodiment of the present invention; Figure 7 This is a side view of the positioning pin of the integrated insulation interruption positioning assembly for synchronous motors provided in an embodiment of the present invention; Figure 8 This is a top view of the integrated insulation interruption and positioning assembly for synchronous motors provided in an embodiment of the present invention; Among them, 1. Motor base plate; 11. First positioning pin hole; 12. Countersunk groove; 2. Positioning seat; 21. Second positioning pin hole; 211. First hole section; 212. Second hole section; 22. Embedded section; 23. Overlapping section; 24. Sealing groove; 3. Positioning pin; 31. Mating section; 32. Positioning section; 33. Operating end; 34. Guide groove; 4. Insulation layer; 5. Locking nut; 6. Sealing gasket. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] like Figures 1 to 3 As shown, the present invention provides an integrated insulation and current-cutting positioning assembly for synchronous motors, used to position and install the motor on a motor base plate 1. The motor base plate 1 has a first positioning pin hole 11. The positioning assembly includes a positioning seat 2 and a positioning pin 3. The positioning seat 2 is fixedly installed on the motor base plate 1. The positioning seat has a second positioning pin hole 21 inside. When the positioning seat 2 is fixedly installed on the motor base plate 1, the second positioning pin hole 21 is coaxial with the first positioning pin hole 11. The positioning pin 3 has a mating section 31 and a positioning section 32. The mating section 31 is inserted into the second positioning pin hole 21 and the first positioning pin hole 11 to realize the positioning and installation of the positioning pin 3 and the motor base plate 1. The positioning section 32 is exposed on the outside of the side of the positioning seat 2 away from the motor base plate 1 and is used for positioning and installing the motor. An insulating layer 4 is provided on the outer wall of the mating section 31 of the positioning pin 3, the inner wall of the second positioning pin hole 21 of the positioning seat 2, and the end face of the positioning seat 2 away from the motor base plate 1.

[0017] In this design, one end face of the positioning seat 2, which is the contact surface with the motor base plate 1, serves as the contact surface between the positioning pin 3 and the circumferential contact surface of the positioning seat 2. This is the path through which the motor's shaft current is transmitted to the ground. By providing an insulating layer 4 on these surfaces, the circuit between the motor and the motor base plate 1 can be isolated, thereby reducing shaft current and electrolytic corrosion of the shaft and bearings. Furthermore, the insulating layer 4 is provided on both the inner wall of the second positioning pin hole 21 and the outer wall of the mating section 31, further enhancing the positioning assembly's ability to isolate shaft current. This effectively prevents the current in the motor shaft from being transmitted to the motor base plate through components such as the positioning pin, thus avoiding bearing electrolytic corrosion.

[0018] like Figures 2 to 8As shown, in one preferred embodiment, the second positioning pin hole 21 is a stepped hole, having a first hole section 211 near the motor base plate 1 and a second hole section 212 away from the motor base plate 1. The diameter of the first hole section 211 is smaller than the diameter of the second hole section 212. The mating section 31 of the positioning pin 3 is stepped, having a first shaft section near the motor base plate 1 and a second shaft section away from the motor base plate 1. The diameter of the first shaft section is smaller than the diameter of the second shaft section. The outer diameter of the first shaft section matches the inner diameter of the first hole section 211, and the outer diameter of the second shaft section is smaller than the inner diameter of the second hole section 212. When the positioning pin 3 is installed in the positioning seat 2, the first shaft section is inserted into the first hole section 211, realizing the positioning installation of the positioning pin 3 and the positioning seat 2. The stepped surface between the first shaft section and the second shaft section abuts against the stepped surface of the first hole section 211 and the second hole section 212, so that the positioning seat 2 provides radial positioning for the positioning pin 3 while also providing axial limiting. By setting the above, the installation depth of the positioning pin 3 between the second positioning pin hole 21 can be limited, thereby ensuring that the positioning section 32 of the positioning pin 3 can protrude a sufficient length from the positioning seat 2, so as to smoothly achieve the installation of the positioning pin 3 and the motor.

[0019] like Figures 3 to 5 As shown, in one preferred embodiment, a countersunk groove 12 is provided outside the first positioning pin hole 11 on the motor base plate 1. The diameter of the countersunk groove 12 is larger than the diameter of the first positioning pin hole 11. The outer contour of the positioning seat 2 is stepped, including an embedded section 22 and an overlapping section 23. The embedded section 22 is embedded in the countersunk groove 12, and the stepped surface at the bottom of the overlapping section 23 abuts against the outer end face of the countersunk groove 12. The overlapping section 23 and the outer end face of the countersunk groove 12 are fixedly connected by welding. By setting the countersunk groove 12 and partially embedding the positioning seat 2 in the countersunk groove 12, the structural volume of the positioning assembly can be reduced. This allows the positioning seat 2 and its internal second positioning pin hole 21 to have sufficient axial length, while the portion of the positioning seat 2 protruding axially from the motor base plate 1 only overlaps the section 23, making the positioning assembly easier to install and use. Furthermore, when welding the positioning seat 2 to the motor base plate 1, the second positioning pin hole 21 and the first positioning pin hole 11 can be aligned first, and appropriate tooling or other components can be used to lock them together radially before welding the positioning seat 2 to the motor base plate 1. This can improve the installation accuracy of the positioning seat 2 on the motor base plate 1. The specific operation for welding the positioning seat 2 to the motor base plate 1 can be adjusted by the user according to the site conditions, and will not be elaborated here.

[0020] like Figures 3 to 5As shown, in one preferred embodiment, an annular sealing groove 24 is provided on the stepped surface at the bottom of the overlapping section 23, and a sealing gasket 6 is installed in the sealing groove 24. By setting the sealing groove 24 and the sealing gasket 6, a sealing fit is formed between the platform of the overlapping section 23 and the outer end face of the countersunk groove 12 of the motor base plate 1, thereby isolating external impurities (including welding slag when welding the positioning seat 2) from entering the countersunk groove 12.

[0021] like Figure 3 As shown, in one preferred embodiment, there is an adjustment gap between the inner wall of the countersunk groove 12 and the outer wall of the embedded section 22. By setting the adjustment gap, the embedded section 22 can move radially within the countersunk groove 12, thereby adjusting the relative position of the positioning seat 2 and the motor base plate 1 to align the first positioning pin hole 11 with the second positioning pin hole 21. This reduces the machining accuracy requirements of the inner hole of the countersunk groove 12 and the outer circular surface of the embedded section 22, and reduces the overall cost.

[0022] like Figure 6 As shown, a guide groove 34 is provided on the mating section 31 of the positioning pin 3. The two ends of the guide groove 34 are located outside the first positioning pin hole 11 and the second positioning pin hole 21. Figure 3 In this configuration, the lower end of the guide channel 34 is located below the motor base plate 1, and the upper end of the guide channel 34 is located above the positioning seat 2 (or at least the upper end of the guide channel 34 is located above the first hole section 211). This allows the guide channel 34 to connect the first positioning pin hole 11 and the second positioning pin hole 21 of the motor base plate 1 and the positioning seat 2 on both sides along the axial direction. On the one hand, this allows a pressure balance channel to be formed in the guide channel 34 during actual use after the motor is installed, which can balance the internal and external pressure difference and improve the performance. On the other hand, if the subsequent use involves disassembling the positioning pin 3, lubricating oil can be injected into the mating surfaces of the positioning pin 3, the positioning seat 2, and the motor base plate 1 through the guide channel 34 to facilitate the disassembly of the positioning pin 3. Furthermore, the width of the guide channel 34 can be designed to be 0.1mm to 0.5mm, and the depth to be 0.5mm to 2mm. Guide textures can be provided on the inner wall of the guide channel 34 to facilitate the flow of air and fluids such as lubricating oil within the guide channel 34, thereby improving the performance.

[0023] In one preferred embodiment, the insulation layer 4 comprises, from the inside out, a mica tape, an anaerobic adhesive layer, and a moisture-proof sealing layer. The mica tape possesses both high-temperature resistance and insulation properties, enabling it to interrupt current while withstanding the high temperatures during motor operation. The anaerobic adhesive layer, applied to the mica tape, fills the microscopic gaps in the mica tape layer, forming a complete and continuous insulator. Finally, the outer moisture-proof sealing layer isolates moisture and improves the corrosion resistance of the entire insulation layer 4, thereby enhancing the service life and stability of the positioning component. The mica tape can be installed using a semi-overlapping winding method, with a total thickness of 0.1mm to 0.3mm. The anaerobic adhesive layer is applied to the mica tape, and the moisture-proof sealing layer uses a polytetrafluoroethylene coating or a silicone rubber layer. The final insulation layer 4 has a thickness of 0.3mm to 1.2mm, a breakdown voltage ≥15kV / mm, and a leakage current <1μA at 50Hz AC voltage, effectively interrupting shaft current.

[0024] like Figures 1 to 3 As shown, in one preferred embodiment, an external thread is provided on the positioning section 32 of the positioning pin 3. The external thread is used to install the locking nut 5. After the motor is positioned and installed on the positioning pin 3, the motor and the positioning pin 3 are locked and installed by the locking nut 5. Of course, in addition to the positioning pin 3 and the locking nut 5, the motor still needs to be fixedly installed with the motor base plate 1 through other connection structures. The locking nut 5 is provided here only to ensure the stability of the positioning connection between the motor and the positioning pin 3.

[0025] Furthermore, such as Figures 2 to 7 As shown, in one preferred embodiment, the end of the positioning segment 32 is also provided with an operating end 33. The operating end 33 can be in the shape of an external hexagon, which makes it easier to fix the positioning pin 3 with a wrench or other appropriate tools, thus improving the convenience of installing the positioning pin 3 and installing the motor on the positioning pin 3.

[0026] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this application; at the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0027] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification describe preferred embodiments of this application; however, these descriptions are intended to illustrate the general principles of this application. Although the invention has been described in detail with reference to embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this invention do not depart from the spirit and scope of the invention and should be covered by the claims.

Claims

1. An integrated insulation and current-cutting positioning assembly for synchronous motors, used for positioning and mounting the motor on a motor base plate, characterized in that, The motor base plate is provided with a first positioning pin hole, and the synchronous motor is equipped with an integrated insulation and current-cutting positioning component. A positioning seat is fixedly installed on the motor base plate. The positioning seat has a second positioning pin hole inside. When the positioning seat is installed on the motor base plate, the second positioning pin hole is coaxial with the first positioning pin hole. An insulating layer is provided on the inner wall of the second positioning pin hole and on the side of the positioning seat away from the motor base plate. The positioning pin has a mating section and a positioning section. The mating section is inserted into the second positioning pin hole and the first positioning pin hole, and the mating section penetrates the motor base plate. The positioning section is exposed on the outside of the positioning seat on the side away from the motor base plate. It is used for positioning and installing the motor. An insulating layer is provided on the outer wall of the mating section of the positioning pin.

2. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 1, characterized in that, The second positioning pin hole is a stepped hole, which has a first hole section near the motor base plate and a second hole section away from the motor base plate. The diameter of the first hole section is smaller than the diameter of the second hole section. The mating section of the positioning pin is stepped, which has a first shaft section near the motor base plate and a second shaft section away from the motor base plate. The diameter of the first shaft section is smaller than the diameter of the second shaft section. The outer diameter of the first shaft section matches the inner diameter of the first hole section. When the positioning pin is installed in the positioning seat, the stepped surface of the positioning pin abuts against the stepped surface of the second positioning pin hole.

3. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 2, characterized in that, A countersunk groove is also provided outside the first positioning pin hole on the motor base plate, and the diameter of the countersunk groove is larger than the diameter of the first positioning pin hole. The outer contour of the positioning seat is stepped. The positioning seat includes an embedded section and an overlapping section. The embedded section is embedded in the countersunk groove. The stepped surface at the bottom of the overlapping section abuts against the outer end face of the countersunk groove. The overlapping section is fixed to the outer end face of the countersunk groove by welding.

4. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 3, characterized in that, An annular sealing groove is provided on the stepped surface at the bottom of the overlapping section, and a sealing gasket is installed in the sealing groove.

5. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 3, characterized in that, There is an adjustment gap between the inner wall of the countersunk groove and the outer wall of the embedded section. Based on the adjustment gap, the embedded section can move radially within the countersunk groove to align the first positioning pin hole with the second positioning pin hole.

6. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 1, characterized in that, The mating section of the positioning pin penetrates the motor base plate, and a guide groove is provided on the mating section. The two ends of the guide groove are located outside the first positioning pin hole and the second positioning pin hole. The width of the guide groove is 0.1mm to 0.5mm, the depth is 0.5mm to 2mm, and the inner wall of the guide groove is provided with guide texture.

7. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 1, characterized in that, The insulating layer comprises, from the inside out, a mica tape, an anaerobic adhesive layer, and a moisture-proof sealing layer.

8. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 7, characterized in that, The mica tape is installed using a semi-overlapping winding method, with a total thickness of 0.1mm to 0.3mm. The anaerobic adhesive layer is coated on the mica tape. The moisture-proof sealing layer is made of polytetrafluoroethylene coating or silicone rubber layer. The overall thickness of the insulation layer is 0.3mm to 1.2mm.

9. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 1, characterized in that, An external thread is provided on the positioning section of the positioning pin. The external thread is used to install a locking nut. The locking nut is used to lock and fix the motor to the positioning pin after the motor is positioned and installed on the positioning pin.

10. The integrated insulation interruption and positioning assembly for synchronous motors according to claim 6, characterized in that, The end of the positioning section is also provided with an operating end.

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