Current insulation blocking structure and processing and manufacturing method and application thereof

Abstract

The invention discloses a current insulation blocking structure which comprises an annular gap formed in an electric conductor, an inner electric conductor and an outer electric conductor, the inner electric conductor and the outer electric conductor are formed in a separated mode due to the arrangement of the annular gap, a plurality of inner conductive bosses are arranged on one side of the inner electric conductor, and a plurality of outer conductive bosses corresponding to the inner conductive bosses are arranged on the outer electric conductor. The inner conductive boss and the outer conductive boss are connected through a bolt assembly, a mounting hole is formed in the inner conductive boss, a through hole is formed in the outer conductive boss, a screw in the bolt assembly is not in contact with the inner wall of the through hole, and insulating ceramic gaskets are arranged at the joint of the inner conductive boss and the outer conductive boss and above the outer conductive boss respectively; the invention further provides a processing and manufacturing method of the current insulation blocking structure and a motor comprising the current insulation blocking structure. According to the current insulation blocking structure provided by the invention, the motor can be prevented from electric corrosion risk, and the blocking structure is convenient to replace and maintain and long in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical insulation, and in particular to a current insulation blocking structure, a processing and manufacturing method thereof, and an application thereof. Background Art

[0002] Bearing and gear electrical corrosion failures have always been a major industry technical problem that has plagued motor and gearbox transmission systems, seriously affecting the reliable operation of transmission systems. With the increase in motor power and the use of inverter modulation technology, the problem of bearing and gear electrical corrosion has become particularly prominent. Therefore, when designing motors and gearboxes, measures must be taken to block the shaft current circuit to prevent bearing and gear electrical corrosion failures and ensure the reliability of the transmission system. To prevent bearing and gear electrical corrosion, the industry currently generally uses insulating blocking structures such as insulating bearings, insulating bearing seats, insulating end covers or insulating flanges to block the shaft current circuit.

[0003] Practice shows that insulating bearings have a good insulation effect on the low-frequency current generated by the motor itself, but due to the thin insulation layer, generally <1mm, the insulation effect on high-frequency shaft current cannot be guaranteed, especially for large bearings, the insulation impedance is small, the capacitance is large, and the insulation effect is poor. In addition, the manufacturing cost of large insulating bearings is expensive and the manufacturing process is complicated, so large bearings generally rarely use insulating bearings to prevent bearing electrical corrosion. The insulating bearing seat is to add an insulating blocking structure between the outer ring of the bearing and the bearing seat, and the insulating end cover is to add an insulating blocking structure between the bearing seat and the end cover, thereby blocking the electrical path formed by the bearing, the bearing seat and the end cover to avoid bearing electrical corrosion. The insulating bearing seat or insulating end cover is an insulating structure proposed based on stationary non-rotating parts. The insulating components are all made of organic insulating materials such as non-weft tape, fiber composite laminated tube and laminate. The insulating flange is for the integrated system of the generator gearbox of the semi-direct-drive wind turbine. The generator does not have an independent shaft system (including bearings). During the operation of the generator, the generator rotor, shaft system and gearbox bearing constitute an electrical path, and there is a risk of electrical corrosion of the gearbox bearing and gear, which is an insulating structure proposed based on the rotating parts. The insulating flange is an insulating component added between the rotor bracket and the hollow shaft of the gearbox. In addition to bearing the gravity and vibration of the generator like the insulating components of the stationary parts, the insulating components also bear rotational torque and centrifugal force, etc. The working conditions are worse than those of the insulating components of the stationary parts. The insulating components are also made of organic insulating materials such as non-weft tapes, fiber composite laminated tubes and laminates.

[0004] The current insulating blocking structures such as insulating end covers, insulating bearing seats and insulating flanges are insulated between the two conductors’ matching stoppers and connecting screws. Non-weft tapes or fiber composite laminated tubes are used at the matching stoppers, and fiber composite laminated tubes and laminated plates are used at the connecting screws. This insulating structure has three functions. First: insulation, blocking shaft current. The current insulating structures can block shaft current to a certain extent, but they are all made of insulating organic materials such as non-weft tapes, fiber composite laminated tubes and laminated plates, and the thickness of the insulating layer is generally ≤6mm. The insulating performance of the insulating material will be greatly reduced after being damp. Second: load-bearing function. The screws at the static insulating structure mainly play a tightening role, mainly bearing the gravity and vibration of the motor; the connecting screws at the rotating insulating structure also need to bear additional harsh working conditions such as rotational torque and centrifugal force. The insulating material is an organic material, and its mechanical strength, environmental weather resistance and creep resistance are average, which can easily cause material failure and loosen the screws at the insulating connection, resulting in a high risk of use; Third: The insulating structure at the joint of the conductor plays a role in matching and positioning. The insulating material is an organic material, and its material dimensional stability is poor, deformation is large, and matching accuracy is low, which causes the coaxiality of the stator and rotor to decrease, and the unilateral magnetic pull and centrifugal force of the generator to increase, resulting in increased vibration and noise of the generator. In addition, the existing insulation structure is inconvenient to replace and maintain, which can easily lead to damage to the insulation structure at the joint. With the increase in motor power and the extension of motor service life, the mechanical life, electrical life and aging durability of the existing insulation structure are extremely worrying. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a current insulation blocking structure, a processing and manufacturing method thereof, and an application thereof. The blocking structure blocks the shaft current circuit through the annular gap between the ceramic gasket, the ceramic sleeve, and the inner conductor and the outer conductor, thereby protecting the motor from the risk of electrical corrosion. The blocking structure is easy to replace and maintain and has a long service life.

[0006] The technical solution provided by the present invention is as follows: A current insulation blocking structure comprises an annular gap formed on a conductor and an inner conductor and an outer conductor separated by the setting of the annular gap, a plurality of inner conductive bosses are provided on one side of the inner conductor, a plurality of outer conductive bosses corresponding to the inner conductive bosses are provided on the same side of the outer conductor as the inner conductor, the inner conductive bosses and the corresponding outer conductive bosses are connected by a bolt assembly, a mounting hole for a screw in the bolt assembly to pass through is provided on the inner conductive bosses, a through hole for a screw in the bolt assembly to pass through is provided on the outer conductive bosses, the screw in the bolt assembly does not contact the inner wall of the through hole, and insulating ceramic gaskets are provided at the connection between the inner conductive bosses and the outer conductive bosses and above the outer conductive bosses.

[0007] Preferably, the diameter of the through hole is larger than the diameter of the screw, and the difference between the diameter of the through hole and the diameter of the screw is 8-12 mm.

[0008] Preferably, the width of the annular gap is not less than 6 mm.

[0009] Preferably, the thickness of the insulating ceramic gasket at the connection between the inner conductive boss and the outer conductive boss is greater than the width of the annular gap.

[0010] Preferably, the annular gap is naturally filled with insulating air or filled with insulating glue.

[0011] Preferably, an insulating ceramic sleeve with a certain wall thickness through which a screw can pass is provided in the through hole.

[0012] Preferably, the wall thickness of the insulating ceramic sleeve is 3 to 4 mm, and the inner diameter of the insulating ceramic sleeve is 1 to 2 mm larger than the diameter of the screw.

[0013] Preferably, the through hole is filled with insulating glue.

[0014] A method for processing and manufacturing the above-mentioned current insulation blocking structure comprises the following steps: S1. Before processing, the inner conductor and the outer conductor are a whole, and the whole is processed to form an annular gap with a certain thickness, and the inner conductive boss and the outer conductive boss are processed to form an annular gap with a certain thickness; S2, spot welding the outer conductive bosses to the end surface of the outer conductor; S3, installing the insulating ceramic gasket, and using a bolt assembly to fix the inner conductive boss, the outer conductive boss and the two insulating ceramic gaskets into a whole; S4, spot welding the inner conductive bosses to the end surface of the inner conductor; S5, circumferentially welding the inner conductive boss and the outer conductive boss to the end surfaces of the inner conductor and the outer conductor respectively; S6. The annular gap is machined through to separate the inner conductor and the outer conductor, and the entire current insulation blocking structure is finely machined as a whole to ensure the coaxiality and accuracy of the inner conductor and the outer conductor.

[0015] A motor, wherein the above-mentioned current insulation and blocking structure or the current insulation and blocking structure prepared by the above-mentioned preparation method is installed on the stationary part of the motor.

[0016] A motor, wherein the above-mentioned current insulation and blocking structure or the current insulation and blocking structure prepared by the above-mentioned preparation method is installed on the rotating part of the motor.

[0017] The present invention has the following advantages over the prior art: The current insulation blocking structure of the present invention blocks the shaft current loop through the insulating ceramic gasket and the inner conductor, the outer conductor, and the annular gap, thereby protecting the moving parts of the motor (such as bearings, gears, etc.) from the risk of electrical corrosion. The blocking structure can be used not only on rotating parts, but also on stationary parts to block the shaft current. The insulating structure transmits torque through the inner conductive boss and the outer conductive boss connecting screws, and the connecting screws at the matching stop of the conductor only play a fixing role, thereby greatly reducing the risk of loosening and failure of the connecting screws at the matching stop; and the insulating structure is not arranged at the matching stop of the conductor, and the matching stop is steel-to-steel matching, which can ensure the accuracy and coaxiality of the matching stop, thereby reducing the vibration and noise of the motor; and the insulating ceramic gasket of the insulating structure belongs to inorganic materials, with high mechanical strength, excellent insulation performance, good environmental weather resistance, good dimensional stability, convenient replacement and maintenance of the insulating structure, and long service life, which can protect the bearings and gears of the transmission system from the risk of electrical corrosion during the entire life cycle, thereby ensuring the reliable use of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of the structure of the current insulation blocking structure in the embodiment of the present invention; Figure 2 for Figure 1 AA section view in; Figure 3 for Figure 2 The enlarged view of point Ⅰ in the figure; Figure 4 It is a schematic diagram of the current insulation blocking structure in which no insulating ceramic sleeve is provided in an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a current insulation blocking structure installed on a stationary part of a small motor in an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a current insulation blocking structure installed on a stationary part of a large motor in an embodiment of the present invention; Figure 7 It is a structural schematic diagram of a current insulation blocking structure installed on a rotating component of a small motor in an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a current insulation blocking structure installed on a rotating component of a small motor in an embodiment of the present invention.

[0020] Reference numerals: 1. Annular gap; 2. Inner conductor; 3. Outer conductor; 4. Inner conductive boss; 5. Outer conductive boss; 51. Through hole; 6. Bolt assembly; 7. Insulating ceramic gasket; 8. Insulating ceramic sleeve; 9. End cover; 10. Bearing seat; 11. Flange; 12. Rotor bracket. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1-8 As shown, an embodiment of the present invention provides a current insulation blocking structure, including an annular gap 1 opened on the conductor and an inner conductor 2 and an outer conductor 3 separated by the setting of the annular gap 1, a plurality of inner conductive bosses 4 are provided on one side of the inner conductor 2, and a plurality of outer conductive bosses 5 corresponding to the inner conductive bosses 4 are provided on the same side of the outer conductor 3 as the inner conductor 2, the inner conductive bosses 4 and the corresponding outer conductive bosses 5 are connected by a bolt assembly 6, and a mounting hole for a screw in the bolt assembly 6 to pass through is provided on the inner conductive boss 4. The mounting hole can be a through hole, which can usually be set to be about 1 to 2 mm larger than the diameter of the screw, or it can be a threaded hole, which is directly connected and fixed with the screw. The outer conductive boss 5 is provided with a through hole 51 for the screw in the bolt assembly 6 to pass through, and the screw in the bolt assembly 6 does not contact the inner wall of the through hole 51. Insulating ceramic gaskets 7 are respectively provided at the connection between the inner conductive boss 4 and the outer conductive boss 5 and above the outer conductive boss 5. The insulating ceramic gasket 7 is used to isolate the bolt assembly 6 from the outer conductive boss 5, and the inner conductive boss 4 from the outer conductive boss 5.

[0023] In this embodiment, the inner conductor 2, the outer conductor 3, the inner conductive boss 4, and the outer conductive boss 5 are made of metal materials, such as steel, aluminum, aluminum alloy, etc., and the insulating ceramic gasket 7 is made of ceramic materials, such as aluminum oxide, silicon carbide, zirconium oxide, etc. There are preferably three or more inner conductive bosses 4 and outer conductive bosses 5, which are uniformly or unevenly distributed in the circumferential direction and fixed to the inner conductor 2 and the outer conductor 3 by welding or bolts.

[0024] In this embodiment, the diameter of the through hole 51 is larger than the diameter of the screw, and the difference between the diameter of the through hole 51 and the diameter of the screw is 8-12 mm.

[0025] In this embodiment, the width of the annular gap 1 is not less than 6 mm. Under this premise, the width of the annular gap 1 can be set as required to completely block the shaft current loop. The annular gap 1 can be directly isolated from the air or filled with epoxy glue to play an insulating and sealing role. The thickness of the insulating ceramic gasket 7 at the connection between the inner conductive boss 4 and the outer conductive boss 5 is greater than the width of the annular gap 1. Under this premise, the thickness of the insulating ceramic gasket 7 can be set as required to completely block the shaft current loop.

[0026] In this embodiment, an insulating ceramic sleeve 8 with a certain wall thickness and through which a screw can pass is provided in the through hole 51. The insulating ceramic sleeve 8 is made of ceramic material, such as aluminum oxide, silicon carbide, zirconium oxide and other ceramic materials. The wall thickness of the insulating ceramic sleeve 8 is 3 to 4 mm, and the inner diameter of the insulating ceramic sleeve 8 is 1 to 2 mm larger than the diameter of the screw. The screw passes through the insulating ceramic sleeve 8, and the insulating ceramic sleeve 8 serves to isolate the screw and the external conductive boss 5. In other embodiments, the insulating ceramic sleeve 8 may not be provided in the through hole 51, because the diameter of the through hole 51 is about 10 mm larger than the diameter of the screw, and the single-side gap is about 5 mm, which can directly isolate the screw from the external conductive boss 5. The through hole 51 may also be filled with insulating glue to isolate the screw from the external conductive boss 5.

[0027] A method for manufacturing the above-mentioned current insulation blocking structure comprises the following steps: S1. Before processing, the inner conductor 2 and the outer conductor 3 are a whole, and the whole is processed to form an annular gap 1 with a certain thickness, and the inner conductive boss 4 and the outer conductive boss 5 are processed to form an annular gap 1 with a certain thickness; S2, spot welding the outer conductive boss 5 to the end surface of the outer conductor 3; S3, installing the insulating ceramic gasket 7, and using the bolt assembly 6 to fix the inner conductive boss 4, the outer conductive boss 5 and the two insulating ceramic gaskets 7 into a whole; S4, spot welding the inner conductive boss 4 to the end surface of the inner conductor 2; S5, circumferentially welding the inner conductive boss 4 and the outer conductive boss 5 to the end surfaces of the inner conductor 2 and the outer conductor 3 respectively; S6. The annular gap 1 is machined through to separate the inner conductor 2 and the outer conductor 3, and the entire current insulation blocking structure is finely machined as a whole to ensure the coaxiality and accuracy of the inner conductor 2 and the outer conductor 3.

[0028] A motor, wherein the above-mentioned current insulation and blocking structure or the current insulation and blocking structure prepared by the above-mentioned preparation method is installed on the stationary part of the motor.

[0029] For small motors, such as between the base and the bearing, the outer conductor 3 is made into one piece with the end cover 9 and is directly connected to the base by bolts, and the inner conductor 2 is directly made into one piece with the bearing seat 10 and cooperates with the outer ring of the bearing, thereby isolating the electrical path between the bearing and the base and protecting the bearing from electrical corrosion. For medium and large motors, considering the difficulty of processing large parts, a split structure can be considered, and the current insulation blocking structure of this embodiment is added between the bearing seat 10 and the end cover 9. The outer conductor 3 is connected to the end cover 9 by bolts, and the end cover 9 is further connected to the base, and the inner conductor 2 is connected to the bearing seat 10 by bolts, and the bearing seat 10 is then matched with the bearing, thereby isolating the electrical path between the bearing and the bearing seat and protecting the bearing from electrical corrosion.

[0030] A motor, wherein the above-mentioned current insulation and blocking structure or the current insulation and blocking structure prepared by the above-mentioned preparation method is installed on the rotating part of the motor.

[0031] For small motors, the current insulation blocking structure of this embodiment is directly installed between the generator rotor bracket 12 and the gearbox shaft, the inner conductor 2 is directly integrated with the flange 11, and the outer conductor 3 is directly integrated with the rotor bracket 12. When the generator set is working, the blade drives the gearbox shaft system to rotate through the main shaft, and the torque is transmitted to the inner conductive boss 4 and the outer conductive boss 5 connecting bolts through the flange 11. The inner conductive boss 4 and the outer conductive boss 5 connecting bolts transmit the torque to the outer conductor 3 by bearing the shear force, thereby driving the rotor bracket 12 to rotate and realizing the generator to generate electricity. For medium and large motors, considering the difficulty of processing large parts, a split structure can be considered, and the current insulation blocking structure of this embodiment is installed between the generator rotor bracket 12 and the flange 11, the inner conductor 2 is connected to the flange 11 by bolts, and the outer conductor 3 is connected to the rotor bracket 12 by bolts. When the generator set is working, the blades drive the gear box shaft system to rotate through the main shaft, and the force is transmitted to the inner conductor 2 through the flange 11. The connecting bolts of the inner conductive boss 4 and the outer conductive boss 5 transmit the torque to the outer conductor 3 by bearing the shear force, driving the rotor bracket 12 to rotate, thereby realizing the generator to generate electricity.

[0032] Compared with the existing insulating bearing seat, insulating bearing chamber or insulating flange, which uses insulating materials such as non-weft tape, fiber composite laminated tube and laminated board to achieve insulation, the current insulation blocking structure of this embodiment has the following advantages: 1. The thickness of the non-weft belt, fiber composite laminate tube and laminated board of the existing solution is generally 2~6mm. The thicker the insulation layer, the worse the mechanical properties. The width of the annular gap 1 and the thickness of the insulating ceramic gasket 7 and the insulating ceramic sleeve 8 of the current insulation blocking structure of this embodiment can be set as needed. Generally, the width of the annular gap is set to be ≥6mm. The mechanical properties of the current insulation blocking structure of this embodiment are not affected by the width of the annular gap 1 and the thickness of the insulating ceramic gasket 7 and the insulating ceramic sleeve 8. Since the current insulation blocking structure of this embodiment has a large insulation gap, it has a smaller capacitance and can better block the shaft current loop, thereby ensuring that the bearings and gears are completely free from the risk of electrical corrosion. 2. The existing organic insulating materials such as weftless belts, fiber composite laminated tubes and laminated boards are greatly affected by environmental factors. The insulation performance will be greatly reduced after being damp, and the mechanical strength will also be greatly reduced with aging. The current insulation blocking structure of this embodiment adopts an annular gap 1 and an insulating ceramic gasket 7 and an insulating ceramic sleeve 8 for insulation. The insulating ceramic gasket 7 and the insulating ceramic sleeve 8 are inorganic materials with good mechanical properties, insulation properties and weather resistance, thereby ensuring the reliability of the unit throughout its life cycle; 3. For rotating insulating parts, the connecting bolts at the joints of the insulating structure of the existing scheme not only have to withstand the gravity and vibration of the motor, but also need to withstand the harsh working conditions such as rotational torque and centrifugal force. The insulating material is an organic material, and its mechanical strength, environmental weather resistance and creep resistance are average, which can easily cause material failure, resulting in loosening of the bolts at the insulating connection at the joints, and high application risks; while the connecting bolts at the joints of the conductor of the current insulation blocking structure of this embodiment only play a connecting and tightening role, and the torque transmission is achieved through the connecting bolts at the inner conductive boss 4 and the outer conductive boss 5, thereby optimizing the force on the connecting bolts at the joints, greatly reducing the risk of loosening of the connecting bolts; 4. In the existing scheme, the insulating structure at the joint of the conductor plays a role in fitting and positioning. The insulating material is an organic material with poor dimensional stability, large deformation, and low fitting accuracy, which can easily lead to reduced coaxiality of the stator and rotor, increased unilateral magnetic pull and centrifugal force of the generator, and increased vibration and noise of the generator. However, the joint of the conductor of the current insulation blocking structure of this embodiment is a direct steel-to-steel fit without an insulation structure. Moreover, the insulating structure of the current insulation blocking structure of this embodiment is an integral fine-processed shape after assembly. The inner conductor 2 and the outer conductor 3 have good coaxiality and high fitting accuracy, which can ensure the accuracy and coaxiality of the conductor joint, thereby reducing motor vibration and noise; 5. The insulating components of the existing scheme are composed of organic materials such as non-weft tape, fiber composite laminate tube and laminate, which have poor dimensional stability, are easy to deform, and have weak creep resistance; while the insulating ceramic gasket 7 and insulating ceramic sleeve 8 of the current insulation blocking structure of this embodiment are made of inorganic materials, have good dimensional stability, and have strong creep resistance; 6. The existing insulation components are composed of organic materials such as non-weft belts, fiber composite laminated tubes and laminated boards. The insulation components at the flange joints are easily damaged during replacement and maintenance. However, the current insulation blocking structure of this embodiment has no insulation components at the joints, which makes replacement and maintenance simple and convenient, and the insulation structure will not be damaged. 7. The current insulation blocking structure of this embodiment can be used not only on the stationary parts of the motor, but also on the rotating parts of the motor, and has a good effect of suppressing shaft current, thereby avoiding electrical corrosion of moving parts (such as bearings, gears, etc.).

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A current insulation blocking structure, characterized in that: The invention comprises an annular gap (1) formed on a conductor and an inner conductor (2) and an outer conductor (3) separated by the annular gap (1); a plurality of inner conductive bosses (4) are provided on one side of the inner conductor (2); a plurality of outer conductive bosses (5) are provided on the outer conductor (3) on the same side as the inner conductor (2) and corresponding to the inner conductive bosses (4); the inner conductive bosses (4) and the corresponding outer conductive bosses (5) are connected by a bolt assembly (6); the inner conductive bosses (4) are provided with mounting holes for screws in the bolt assembly (6) to pass through; the outer conductive bosses (5) are provided with through holes (51) for screws in the bolt assembly (6) to pass through; the screws in the bolt assembly (6) do not contact the inner wall of the through holes (51); insulating ceramic gaskets (7) are provided at the connection between the inner conductive bosses (4) and the outer conductive bosses (5) and above the outer conductive bosses (5).

2. The current insulation and blocking structure according to claim 1, characterized in that: The diameter of the through hole (51) is larger than the diameter of the screw, and the difference between the diameter of the through hole (51) and the diameter of the screw is 8 to 12 mm.

3. The current insulation blocking structure according to claim 1, characterized in that: The width of the annular gap (1) is not less than 6 mm.

4. The current insulation blocking structure according to claim 3, characterized in that: The thickness of the insulating ceramic gasket (7) at the connection between the inner conductive boss (4) and the outer conductive boss (5) is greater than the width of the annular gap (1).

5. The current insulation and blocking structure according to claim 1, characterized in that: The annular gap (1) is naturally filled with insulating air or filled with insulating glue.

6. The current insulation and blocking structure according to any one of claims 1 to 5, characterized in that: An insulating ceramic sleeve (8) having a certain wall thickness and capable of allowing a screw to pass through is arranged in the through hole (51).

7. The current insulation and blocking structure according to claim 6, characterized in that: The wall thickness of the insulating ceramic sleeve (8) is 3 to 4 mm, and the inner diameter of the insulating ceramic sleeve (8) is 1 to 2 mm greater than the diameter of the screw.

8. The current insulation and blocking structure according to any one of claims 1 to 5, characterized in that: The through hole (51) is filled with insulating glue.

9. A method for processing and manufacturing a current insulating and blocking structure according to any one of claims 1 to 8, characterized in that: The steps are as follows: S1. Before processing, the inner conductor (2) and the outer conductor (3) are a whole, and the whole is processed to form an annular gap (1) with a certain thickness, and the inner conductive boss (4) and the outer conductive boss (5) are processed to form a blank; S2, spot welding the outer conductive boss (5) to the end surface of the outer conductor (3) on the left and right sides; S3, installing the insulating ceramic gasket (7), and using a bolt assembly (6) to fix the inner conductive boss (4), the outer conductive boss (5) and the two insulating ceramic gaskets (7) into a whole; S4, spot welding the inner conductive boss (4) to the end surface of the inner conductive body (2) on the left and right sides; S5, respectively welding the inner conductive boss (4) and the outer conductive boss (5) to the end surfaces of the inner conductor (2) and the outer conductor (3) in a circumferential direction; S6. The annular gap (1) is machined through to separate the inner conductor (2) and the outer conductor (3), and the entire current insulation blocking structure is finely machined as a whole to ensure the coaxiality and accuracy of the inner conductor (2) and the outer conductor (3).

10. A motor, characterized in that: The stationary part of the motor is installed with the current insulation and blocking structure described in any one of claims 1 to 8 or the current insulation and blocking structure prepared by the manufacturing method described in claim 9.

11. A motor, characterized in that: The rotating part of the motor is installed with the current insulation and blocking structure described in any one of claims 1 to 8 or the current insulation and blocking structure prepared by the manufacturing method described in claim 9.

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