A large linear motor stator winding wire copper rod connection method

Abstract

The application relates to the technical field of cable connection, and discloses a large linear motor stator winding outgoing copper rod connection method, which comprises the following steps: sequentially stripping an outer sheath, a metal shielding layer, a semi-conductive layer and an insulating layer from the outside to the inside of a cable piece, and the stripping lengths of the outer sheath, the metal shielding layer, the semi-conductive layer and the insulating layer are sequentially reduced; stripping one end of the semi-conductive layer close to the metal shielding layer to expose semi-conductive nylon cloth of the semi-conductive layer, wrapping the semi-conductive nylon cloth with semi-conductive self-adhesive tape and reaching one end of the metal shielding layer close to the semi-conductive layer; fixing a grounding wire on one side of the metal shielding layer; smearing silicone grease on the surface of the insulating layer and sleeving a cold-shrink terminal body; embedding a motor side wire rod into one end of a special-shaped connecting piece, embedding an electric core end of the cable piece into the other end of the special-shaped connecting piece, pushing a cold-shrink insulating tube to a position covering the special-shaped connecting piece and the cable piece and performing shrinkage. The technical scheme of the application aims to realize the intermediate cable connection of a linear motor.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, and in particular to a method for connecting the copper rods leading out of the stator winding of a large linear motor. Background Technology

[0002] The connection between phases of the stator winding outputs and the neutral point busbar of a large linear motor is achieved using flexible tinned fine copper wire cables. The transition between the square output copper rods and the flexible cables needs to be addressed to ensure the conductor's current-carrying capacity and insulation performance to ground at the connection point, withstand intermittent high-current impacts at multiple frequencies, and possess good waterproof sealing performance. Currently, there is no specific solution for the connection structure of the phase-to-phase connection and neutral point busbar of a linear motor. Summary of the Invention

[0003] The main objective of this invention is to provide a method for connecting the stator winding lead copper rods of a large linear motor, which aims to achieve the connection of the intermediate flexible cable and the neutral point busbar of the stator winding lead copper rods of the linear motor.

[0004] To achieve the above objectives, this invention proposes a method for connecting the copper rods leading out of the stator winding of a large linear motor. The method includes:

[0005] Taking the end of the cable component as a reference, the outer sheath, metal shielding layer, semi-conductive layer and insulation layer are stripped in sequence from the outside to the inside of the cable component, and the stripping length of the outer sheath, metal shielding layer, semi-conductive layer and insulation layer decreases in sequence.

[0006] Remove the end of the semiconductive layer near the metal shielding layer to expose the semiconductive nylon fabric of the semiconductive layer, and wrap the semiconductive nylon fabric with semiconductive self-adhesive tape to the end of the metal shielding layer near the semiconductive layer.

[0007] A grounding wire is fixed to one side of the metal shielding layer;

[0008] Apply silicone grease to the surface of the insulating layer and fit it into the cold shrink terminal body to shrink the cold shrink terminal body;

[0009] The motor side rod is fitted into one end of the irregular connector, and the battery core end of the cable is fitted into the other end of the irregular connector. Silicon grease is applied to the surface of the semi-conductive layer. The cold-shrink insulating tube is pushed to cover the irregular connector and the cable and then shrunken.

[0010] In some embodiments of the present invention, the irregular connector includes a connector body, and the two ends of the connector body are respectively provided with a first opening and a second opening. The radial cross-section of the first opening is rectangular and the radial cross-section of the second opening is circular. The cable component is fitted into the second opening, and the motor side bar is fitted into the second opening.

[0011] In some embodiments of the present invention, the step of fixing a grounding wire to one side of the metal shielding layer includes:

[0012] Wrap the grounding wire around a metal shielding layer and tighten it with a constant force spring. Wrap a layer of sealant around the outer sheath downwards, press the grounding wire tightly against the cable, wrap another layer of sealant around the grounding wire, and fill the gap at the grounding wire connection with sealant.

[0013] In some embodiments of the present invention, the step of fitting the motor side bar into one end of the irregular connector includes:

[0014] Insert the cold-shrink insulating tube onto the motor side bar, and use a file or sandpaper to polish the oxide layer and burrs on the surface of the motor side bar. Insert the first opening into the motor side bar and use a hexagonal die to press it in place. After pressing, hold for 5-8 seconds and use sandpaper or a file to polish the burrs at the pressing position.

[0015] In some embodiments of the present invention, two layers of semi-conductive self-adhesive tape are wrapped around the irregular connector, and then an insulating self-adhesive tape is wrapped around to cover the semi-conductive self-adhesive tape. Finally, a layer of heat-resistant sealant is wrapped around the insulating self-adhesive tape.

[0016] The sleeve positions at both ends of the irregular connector are filled with insulating self-adhesive tape.

[0017] In some embodiments of the present invention, the cold shrink terminal body of the cable component is provided with a stress cone.

[0018] In some embodiments of the present invention, the formula for the length of the stress cone is:

[0019] lk=(U / Et)ln(ln(Rn / r) / ln(R / r));

[0020] lk is the ideal stress cone length; Et is the axial field strength of the stress cone surface design; Rn is the increased insulation radius.

[0021] In some embodiments of the present invention, the formula for the cone surface of the stress cone is:

[0022] x=(U / Et1)ln(ln(y / r) / ln(R / r));

[0023] In the formula, x and y are the coordinates of a point on the cone surface; U is the power frequency test voltage; Et1 is the axial field strength of the stress cone surface design; r is the outer radius of the cable conductor shielding layer; and R is the outer radius of the cable insulation.

[0024] In some embodiments of the present invention, the cold-shrink insulating tube is a silicone rubber insulating structure in the shape of an umbrella skirt.

[0025] The technical solution of this invention improves the connection strength of the cable connection by wrapping the stripped cable with insulating material; it achieves a sealed connection between the cable and the motor side bar by using special-shaped connectors to isolate the inside of the joint from the external environment; and further improves the sealing performance of the bar connection by setting up a cold-shrink insulating tube. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating the method for connecting the copper rods leading out of the stator winding of a large linear motor according to the present invention.

[0028] Figure 2 This is a schematic diagram of the cable component of the present invention;

[0029] Figure 3 This is a schematic diagram of the irregular-shaped connector of the present invention;

[0030] Figure 4 This is a schematic diagram of the wire bar structure of the present invention.

[0031] Explanation of icon numbers:

[0032] 100 Cable components 300 irregular connectors 110 outer sheath 310 First opening 120 Metal shielding layer 320 Second opening 130 Semiconducting layer 400 grounding wire 140 Insulation layer 500 constant force spring 150 battery cells 600 Cold shrink insulation tubing 200 Motor side bar

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, the user should consider such a combination of technical solutions to be non-existent and not within the scope of protection claimed by this invention.

[0037] See appendix Figure 1 This invention proposes a method for connecting the copper rods leading out of the stator winding of a large linear motor. The method includes:

[0038] Taking the end of the cable component 100 as a reference, the outer sheath 110, the metal shielding layer 120, the semi-conductive layer 130 and the insulation layer 140 are stripped in sequence from the outside to the inside of the cable component 100, and the stripping length of the outer sheath 110, the metal shielding layer 120, the semi-conductive layer 130 and the insulation layer 140 are set to decrease in sequence.

[0039] Peel off the end of the semiconductive layer 130 near the metal shielding layer 120 to expose the semiconductive nylon fabric of the semiconductive layer 130. Wrap the semiconductive nylon fabric with semiconductive self-adhesive tape to the end of the metal shielding layer 120 near the semiconductive layer 130.

[0040] A grounding wire 400 is fixed on one side of the metal shielding layer 120; the grounding treatment of the rod connection is achieved through the grounding wire 400.

[0041] Apply silicone grease to the surface of the insulating layer 140 and fit it into the cold shrink terminal body to shrink the cold shrink terminal body;

[0042] The motor side wire bar 200 is fitted into one end of the irregular connector 300, and the battery core 150 end of the cable 100 is fitted into the other end of the irregular connector 300. Silicone grease is applied to the surface of the semi-conductive layer 130. The cold shrink insulation tube 600 is pushed to cover the irregular connector 300 and the cable 100 and then shrunken.

[0043] The method for connecting the lead-out copper rods of the stator winding of a large linear motor based on the above-mentioned technical features improves the connection strength of the cable component 100 by wrapping the stripped cable component 100 with insulating material; it achieves a sealed connection between the cable component 100 and the motor-side lead-out rod 200 by using a special-shaped connector 300, thereby isolating the internal and external environments of the joint; and further improves the sealing performance of the lead-out rod connection by setting a cold-shrink insulating tube 600.

[0044] Furthermore, the irregular connector 300 includes a connector body, with a first opening 310 and a second opening 320 respectively at both ends. The radial cross-section of the first opening 310 is rectangular, and the radial cross-section of the second opening 320 is circular. The cable 100 is fitted into the second opening 320, and the motor side rod 200 is fitted into the second opening 320, thereby achieving a fixed connection between the motor side rod 200 and the battery cell 150. In this embodiment, the surface of the irregular connector 300 is tin-plated to further improve its corrosion resistance.

[0045] The step of fixing a grounding wire 400 to one side of the metal shielding layer 120 includes:

[0046] See appendix Figure 2 The grounding wire 400 is wrapped with a metal shielding layer 120 and tightened with a constant force spring 500. A layer of sealant is wrapped around the outer sheath 110 downwards. The grounding wire 400 is then tightly attached to the cable fitting 100, and another layer of sealant is wrapped around the grounding wire. The sealant is used to fill the gaps at the grounding wire connection. This achieves a tight fit between the grounding wire 400 and the cable fitting 100, and the grounding wire 400 is fixed by the constant force spring 500.

[0047] Specifically, the step of fitting the motor side wire bar 200 into one end of the irregular connector 300 includes:

[0048] Insert the cold-shrink insulating tube 600 onto the motor side wire bar 200, and use a file or sandpaper to polish the oxide layer and burrs on the surface of the motor side wire bar 200. Insert the first opening 310 into the motor side wire bar 200 and use a hexagonal die to press it in place. After pressing, hold for 5-8 seconds and use sandpaper or a file to polish the burrs at the pressing position; this further improves the connection stability of the irregular connector 300.

[0049] Furthermore, two layers of semi-conductive self-adhesive tape are wrapped around the irregular connector 300, followed by an insulating self-adhesive tape layer covering the semi-conductive self-adhesive tape, and finally a layer of heat-resistant sealant is wrapped around the insulating self-adhesive tape; this increases the tightness of the connection between the cold-shrink insulating tube 600 and the irregular connector 300.

[0050] Participation Figure 3-4The sleeve positions at both ends of the irregular connector 300 are filled with insulating self-adhesive tape to improve the connection stability between the irregular connector 300, the cable component 100, and the motor rod.

[0051] The irregular connector 300 is designed by combining the structural foundation of the motor side with the processing structure of the cable side. The cable component 100 and the conductor on the motor side are connected to the irregular connector 300 by crimping, ensuring a tight connection and reliable current carrying capacity. The crimping position needs to be deburred and filled with semi-conductive tape. The gap between the conductor and the irregular connector 300 is filled with sealant to improve the overall integrity of the connection.

[0052] In some embodiments of the present invention, the cold-shrink terminal body of the cable component 100 is provided with a stress cone; the stress cone extends the cut portion of the insulation layer 140 to form a trumpet shape, thereby improving the electric field distribution of the insulation shielding layer and reducing the possibility of corona generation.

[0053] In this embodiment, the formula for the length of the stress cone is:

[0054] lk=(U / Et)ln(ln(Rn / r) / ln(R / r));

[0055] lk is the ideal stress cone length; Et is the axial field strength of the stress cone surface design; Rn is the increased insulation radius.

[0056] Furthermore, the formula for the cone surface of the stress cone is:

[0057] x=(U / Et1)ln(ln(y / r) / ln(R / r));

[0058] In the formula, x and y are the coordinates of a point on the cone surface; U is the power frequency test voltage; Et1 is the axial field strength of the stress cone surface design; r is the outer radius of the cable conductor shielding layer; and R is the outer radius of the cable insulation.

[0059] The stress cone is modeled and calculated using simulation software. After calculating the relevant dimensions of the stress cone, the electric field distribution inside and outside the stress cone is appropriately adjusted by adjusting the length and curve of the stress cone, thereby obtaining the optimal stress cone structure.

[0060] In this embodiment, the cold-shrink insulating tube 600 has an umbrella-shaped silicone rubber insulating structure, which avoids electrical insulation and flashover protection.

[0061] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for connecting the copper rods leading out of the stator winding of a large linear motor, characterized in that, The method for connecting the copper rods leading out of the stator winding of the large linear motor includes: Taking the end of the cable component as a reference, the outer sheath, metal shielding layer, semi-conductive layer and insulation layer are stripped in sequence from the outside to the inside of the cable component, and the stripping length of the outer sheath, metal shielding layer, semi-conductive layer and insulation layer decreases in sequence. Remove the end of the semiconductive layer near the metal shielding layer to expose the semiconductive nylon fabric of the semiconductive layer, and wrap the semiconductive nylon fabric with semiconductive self-adhesive tape to the end of the metal shielding layer near the semiconductive layer. A grounding wire is fixed to one side of the metal shielding layer; Apply silicone grease to the surface of the insulating layer and fit it into the cold shrink terminal body to shrink the cold shrink terminal body; The motor side wire bar is fitted into one end of the irregular connector, and the battery core end of the cable is fitted into the other end of the irregular connector. Silicon grease is applied to the surface of the semi-conductive layer. The cold shrink insulating tube is pushed to cover the irregular connector and the cable and then shrunken. The irregular connector includes a connector body, with a first opening and a second opening at each end of the connector body. The radial cross-section of the first opening is rectangular, and the radial cross-section of the second opening is circular. The cable component is fitted into the second opening, and the motor side rod is fitted into the second opening. Insert the cold-shrink insulating tube onto the motor side bar, and use a file or sandpaper to polish the oxide layer and burrs on the surface of the motor side bar. Insert the first opening into the motor side bar and use a hexagonal die to press it together. After pressing it into place, hold for 5-8 seconds and use sandpaper or a file to polish the burrs at the pressing position. Wrap two layers of semi-conductive self-adhesive tape around the irregular connector, then wrap an insulating self-adhesive tape over the semi-conductive self-adhesive tape, and finally wrap a layer of heat-resistant sealant around the insulating self-adhesive tape. The sleeve positions at both ends of the irregular connector are filled with insulating self-adhesive tape; the cold-shrink insulating tube has an umbrella-shaped silicone rubber insulating structure.

2. The method for connecting the copper rods leading out of the stator winding of a large linear motor as described in claim 1, characterized in that, The step of fixing a grounding wire to one side of the metal shielding layer includes: Wrap the grounding wire around a metal shielding layer and tighten it with a constant force spring. Wrap a layer of sealant around the outer sheath downwards, press the grounding wire tightly against the cable, wrap another layer of sealant around the grounding wire, and fill the gap at the grounding wire connection with sealant.

3. The method for connecting the copper rods leading out of the stator winding of a large linear motor as described in claim 1, characterized in that, The cold-shrink terminal body of the cable component is provided with a stress cone.

4. The method for connecting the copper rods leading out of the stator winding of a large linear motor as described in claim 3, characterized in that, The formula for the length of the stress cone is: lk = (U / Et) ln (ln ( Rn / r) / ln ( R / r) ); lk is the ideal stress cone length; Et is the axial field strength designed for the stress cone surface; Rn is the radius of the insulation.

5. The method for connecting the copper rods leading out of the stator winding of a large linear motor as described in claim 3, characterized in that, The formula for the cone surface of the stress cone is: x = (U / Et1 ) ln (ln ( y / r) / ln ( R / r) ); In the formula, x and y are the coordinates of a point on the cone surface; U is the power frequency test voltage; Et1 is the axial field strength of the stress cone surface design; r is the outer radius of the cable conductor shielding layer; and R is the outer radius of the cable insulation.

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