Adjustable Junction Box System with Multiple Wiring Methods for Permanent Magnet Motor Test Platform

Abstract

The present invention discloses an adjustable junction box system with multiple wiring methods for a permanent magnet motor test platform. The junction box includes a U-phase terminal block array, a V-phase terminal block array, and a W-phase terminal block array that are distributed in parallel; the U-phase terminal block array, the V-phase terminal block array, and the W-phase terminal block array are each composed of a number of terminal blocks that are distributed in an array and are independent of each other; each phase power line and a number of lead-out wires of the permanent magnet motor winding are electrically connected to each of the terminal blocks respectively; this increases the versatility of the motor under test.

Description

Technical Field

[0001] The present invention belongs to the field of motor junction boxes. Background Art

[0002] As a core component of ship power, the performance of a marine shaft generator directly affects the power output and operating efficiency of the ship. Therefore, performance testing and evaluation of marine shaft generators are of great significance for improving the technical level of ship power plants and reducing operating costs.

[0003] Currently, regarding marine shaft generators at home and abroad, it is just in the stage of small-batch promotion, and the research on its test system is still in its infancy. A perfect test system and technical standards have not yet been formed. Currently, the rated voltage and rated power of conventional matching test motors are constant. When encountering various motors with different voltages, corresponding matching test machines often need to be equipped, which greatly increases the cost and lack of universality.

[0004] In the junction box structure provided by this solution, the motor can be adapted to different voltages by changing the number of parallel winding paths in the junction box, making the matching test motor more universal.

[0005] Since the installation positions of the terminal blocks in the junction box cannot ensure a completely equidistant array distribution, even if equidistant is achieved, the distance between two diagonally adjacent terminal blocks is different from the distance between two adjacent terminal blocks in the vertical and horizontal directions. Therefore, the shapes of the bridges (also called conductive sheets) used to electrically connect adjacent terminal blocks in the junction box are different. For each new wiring method added, the length and shape of the bridge need to be customized specifically. Moreover, during the test phase, the connection method of the bridge needs to be repeatedly changed and tested. In order to improve the universality of the bridge, it is necessary to design a bridge structure with adjustable length that can adaptively adjust its own bridge size according to the actual situation for this test requirement. Once the bridge has the characteristics of contraction and elongation, problems such as poor contact will inevitably occur, and this problem also needs to be solved. Summary of the Invention

[0006] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides an adjustable junction box system with multiple wiring methods for a permanent magnet motor test platform, making the matching test motor more universal.

[0007] Technical Solution: To achieve the above object, the adjustable junction box system with multiple wiring methods for the permanent magnet motor test platform of the present invention includes a U-phase terminal block array, a V-phase terminal block array, and a W-phase terminal block array that are arranged side by side in the junction box; the U-phase terminal block array, the V-phase terminal block array, and the W-phase terminal block array are each composed of a number of terminal blocks that are arranged in an array and are independent of each other; each phase power line and several lead-out wires of the permanent magnet motor winding are electrically connected to each of the terminal blocks.

[0008] The junction box further includes a horizontally arranged metal conductive bar disposed on one side of the U-phase terminal block array, the V-phase terminal block array, and the W-phase terminal block array; the terminal blocks at one end of the U-phase terminal block array, the V-phase terminal block array, and the W-phase terminal block array close to the metal conductive bar can all be electrically connected to the metal conductive bar through detachable conductive bridges;

[0009] Any two adjacent terminal blocks in the U-phase terminal block array, the V-phase terminal block array, and the W-phase terminal block array can be electrically connected to each other through detachable conductive bridges.

[0010] Furthermore, the number and layout of the terminal blocks in the U-phase terminal block array, the V-phase terminal block array, and the W-phase terminal block array are the same; and a number of conductive bridge locking holes are provided on the conductors of each terminal block and the metal conductive bar.

[0011] Furthermore, the U-phase terminal block array includes at least five terminal blocks, denoted as the U terminal block, the U1-1 terminal block, the U1-2 terminal block, the U2-1 terminal block, and the U2-2 terminal block;

[0012] The V-phase terminal block array includes at least five terminal blocks, denoted as the V terminal block, the V1-1 terminal block, the V1-2 terminal block, the V2-1 terminal block, and the V2-2 terminal block;

[0013] The W-phase terminal block array includes at least five terminal blocks, denoted as the W terminal block, the W1-1 terminal block, the W1-2 terminal block, the W2-1 terminal block, and the W2-2 terminal block;

[0014] Among them, the U terminal block, the V terminal block, and the W terminal block are electrically connected to the U-phase, V-phase, and W-phase power supply lines respectively.

[0015] Furthermore, hollow a wiring holes and b wiring holes are respectively provided at both ends of the conductive bridge; the a wiring hole / b wiring hole can be locked to the conductive bridge locking hole on any terminal block through bolts.

[0016] Furthermore, the distance between the a wiring hole and the b wiring hole of the bridge structure is adjustable.

[0017] Furthermore, the conductive bridge includes an a conductive sheet, a b conductive sheet, a conductive elastic sheet, and a sliding sleeve; the a wiring hole and the b wiring hole are respectively at the ends of the a conductive sheet and the b conductive sheet that are far away from each other, and the ends of the a conductive sheet and the b conductive sheet that are close to each other are movably sleeved in the movable channels in the sliding sleeve. Guide grooves are provided along the length direction on both sides in the movable channels, and the two side edges of the a conductive sheet and the b conductive sheet are in guiding cooperation with the guide grooves on both sides in the movable channels;

[0018] On one side of the a conductive sheet and the b conductive sheet close to each other, an a conductive bar and a b conductive bar that are parallel to each other and arranged at intervals are integrally connected respectively; a hollow window is provided in the middle section of the upper part of the sliding sleeve, and the conductive elastic sheet is at the hollow window. The two ends of the conductive elastic sheet are respectively bent and folded downward to form an a pressing part and a b pressing part; the lower sides of the a pressing part and the b pressing part are the a conductive bar and the b conductive bar respectively.

[0019] Further, the conductive bridge further includes a rotating cylinder, an axial pre-tightening force spring, a stud and a guide rod; there is a bearing hole in the center of the bottom wall of the sliding sleeve, and the upper end of the rotating cylinder is rotationally matched with the bearing hole through a bearing; an outer ring of the upper end of the rotating cylinder is integrally provided with a gear, and the gear is between the a conductive bar and the b conductive bar; on one side edges of the a conductive bar and the b conductive bar close to each other, an a transmission tooth body array and a b transmission tooth body array are respectively arranged along the length direction; the gear meshes with the a transmission tooth body array and the b transmission tooth body array at the same time. When the gear rotates actively, under the meshing drive, the a conductive bar and the b conductive bar make relative movements along the length direction.

[0020] Further, a threaded hole penetrating up and down along the axis is coaxially arranged in the integrated structure formed by the gear and the rotating cylinder, and the lower outer thread of the stud is in threaded fit with the threaded hole; the upper end of the stud is integrally connected with a bolt head that can be screwed by a screwdriver, and an upper chuck and a lower chuck are integrally fixed on the upper part of the stud. A hollow opening is provided in the center of the conductive elastic sheet, the stud passes through the hollow opening movably, and the conductive elastic sheet can be movably clamped between the upper chuck and the lower chuck; a rotation stopping opening is provided at the edge of the conductive elastic sheet, and the guide rod passes through the rotation stopping opening upward movably, and the lower end of the guide rod is fixedly connected to the bottom wall of the sliding sleeve;

[0021] The axial pre-tightening force spring is sleeved on the lower part of the stud, and the upper and lower ends of the pre-tightening force spring respectively elastically press the lower chuck and the gear, so that the integrated structure formed by the gear and the rotating cylinder is subjected to an axial pre-tightening force, so that there is an axial pre-tightening force from the axial pre-tightening force spring in the threaded fit between the outer thread of the stud and the inner thread of the threaded hole. This axial pre-tightening force forms a frictional resistance that hinders the relative rotation between the outer thread of the stud and the inner thread of the threaded hole. In the free state, the gear and the rotating cylinder will rotate synchronously with the stud under the action of the static friction force during the threaded fit;

[0022] When the positions of the a conductive sheet and the b conductive sheet are completely locked, the gear is completely locked under the common rigid constraints of the a transmission tooth body array and the b transmission tooth body array. At this time, if the stud is forcibly rotated downward and tightened, the stud will be forced to move downward under the driving of the thread. The downward displacement of the stud forces the upper chuck to press the middle part of the conductive elastic sheet downward, so that the a pressing part and the b pressing part of the conductive elastic sheet respectively elastically press the a conductive bar and the b conductive bar downward tightly; the a conductive sheet and the b conductive sheet are stably electrically connected under the elastic pressing fit of the conductive elastic sheet.

[0023] Beneficial effects: In the junction box structure provided by the solution of the present invention, the motor can be adapted to different voltages by changing the number of parallel winding paths in the junction box, which increases the versatility of the tested motor;

[0024] The newly designed bridge in this solution has the characteristic of adjustable length, and at the same time solves problems such as poor contact that may exist in the conductive bridge with adjustable length. Description of the drawings

[0025] Appendix Figure 1 is the electrical circuit diagram of phase U

[0026] Appendix Figure 2 is a schematic diagram of the initial state of the junction box;

[0027] Appendix Figure 3 is the first bridge wiring scheme taking phase U as an example:

[0028] Appendix Figure 4 is the second bridge wiring scheme taking phase U as an example:

[0029] Appendix Figure 5 is a schematic diagram of the structure of the newly designed conductive bridge in this solution;

[0030] Appendix Figure 6 is the first disassembly schematic diagram of the newly designed conductive bridge in this solution;

[0031] Appendix Figure 7 is the second disassembly schematic diagram of the newly designed conductive bridge in this solution. Detailed implementation manners

[0032] The present invention will be further described below with reference to the drawings.

[0033] As shown in the appendix Figures 1 to 6 The multi-voltage adjustable junction box of the permanent magnet motor test platform shown, the junction box includes a U-phase terminal block array 1, a V-phase terminal block array 2 and a W-phase terminal block array 1 distributed in parallel; the U-phase terminal block array 1, the V-phase terminal block array 2 and the W-phase terminal block array 1 are each composed of a number of terminal blocks distributed in an array and independent of each other; each phase power line and a number of lead-out wires of the permanent magnet motor winding are respectively electrically connected to each of the terminal blocks;

[0034] The junction box further includes a horizontally disposed metal conductive bar Y on one side of the U-phase terminal block array 1, the V-phase terminal block array 2, and the W-phase terminal block array 1; the terminal blocks at the end of the U-phase terminal block array 1, the V-phase terminal block array 2, and the W-phase terminal block array 1 close to the metal conductive bar Y can all be electrically connected to the metal conductive bar Y through a detachable conductive bridge 5; any two adjacent terminal blocks in the U-phase terminal block array 1, the V-phase terminal block array 2, and the W-phase terminal block array 1 can be electrically connected to each other through a detachable conductive bridge 5. The existing conductive bridge 5 is generally in a fixed form, such as Figure 3 and 4 shown.

[0035] The number of terminal blocks and the layout of the terminal blocks in the U-phase terminal block array 1, the V-phase terminal block array 2, and the W-phase terminal block array 1 are the same; and a plurality of conductive bridge locking holes 4 are provided on the conductors of each terminal block and the metal conductive bar Y.

[0036] such as Figure 2 shown:[[]]END]]

[0037] The U-phase terminal block array 1 includes at least five terminal blocks, which are respectively denoted as the U terminal block, the U1-1 terminal block, the U1-2 terminal block, the U2-1 terminal block, and the U2-2 terminal block.

[0038] The V-phase terminal block array 2 includes at least five terminal blocks, which are respectively denoted as the V terminal block, the V1-1 terminal block, the V1-2 terminal block, the V2-1 terminal block, and the V2-2 terminal block.

[0039] The W-phase terminal block array 1 includes at least five terminal blocks, which are respectively denoted as the W terminal block, the W1-1 terminal block, the W1-2 terminal block, the W2-1 terminal block, and the W2-2 terminal block.

[0040] Among them, the U terminal block, the V terminal block, and the W terminal block are respectively electrically connected to the U-phase, V-phase, and W-phase power supply lines.

[0041] Hollow a wiring holes 19 and b wiring holes 31 are respectively provided at both ends of the conductive bridge 5; the a wiring holes 19 or the b wiring holes 31 can be locked on the conductive bridge locking holes 4 on any terminal block through bolts.

[0042] The application object of this solution is a 180-slot 40-pole permanent magnet motor. The number of slots per pole per phase q = number of slots / number of poles / 3, q = 2 / 3; taking the U phase as an example, the electrical circuit diagram of the U phase Figure 1 shown: Figure 1 The U1-1 lead wire, the U1-2 lead wire, the U2-1 lead wire, and the U2-2 lead wire in[]]END]] Figure 2The U1-1 terminal block, U1-2 terminal block, U2-1 terminal block, and U2-2 terminal block in the U-phase terminal block array 1; the motor winding in this case uses 5 paths as the minimum unit. This solution can change the parallel path number of the motor by changing the bridge connection method in the junction box, and can be changed to 5 paths or 10 paths, that is, the corresponding voltage and frequency of the motor are changed, so as to achieve the purpose of multi-voltage adjustment for the same motor; the specific wiring scheme includes at least the following two bridge wiring schemes:

[0043] The first bridge wiring scheme taking the U-phase as an example, as Figure 3 shown:

[0044] The three bridges 5 required in this wiring scheme are respectively denoted as a bridge 5A, b bridge 5B, and c bridge 5C; the a bridge 5A electrically connects the horizontally placed metal conductive bar Y to the U2-1 terminal block; the b bridge 5B electrically connects the U2-2 terminal block to the U1-1 terminal block; the c bridge 5C electrically connects the U1-2 terminal block to the U terminal block; in this wiring scheme, the parallel path number of the motor is 5 paths.

[0045] The second bridge wiring scheme taking the U-phase as an example, as Figure 4 shown:

[0046] The four bridges 5 required in this wiring scheme are respectively denoted as d bridge 5D, e bridge 5E, f bridge 5F, and g bridge 5G. The d bridge 5D electrically connects the horizontally placed metal conductive bar Y to the U2-2 terminal block; the e bridge 5E electrically connects the U2-1 terminal block to the horizontally placed metal conductive bar Y; the f bridge 5F electrically connects the U1-1 terminal block to the U terminal block; the g bridge 5G electrically connects the U1-2 terminal block to the U terminal block; in this wiring scheme, the parallel path number of the motor becomes 10 paths.

[0047] This solution can change the parallel path number of the motor by changing the bridge connection method in the junction box, and can be changed to 5 paths or 10 paths, that is, the corresponding voltage and frequency of the motor are changed, so as to achieve the purpose of multi-voltage adjustment for the same motor. Not only the above bridge wiring schemes, but also more other bridge wiring methods, such as Figure 3 and 4Among them, in the above wiring method, the lengths of the a-bridge 5A, b-bridge 5B, c-bridge 5C, d-bridge 5D, e-bridge 5E, f-bridge 5F, and g-bridge 5G are very likely to be different, and their shapes are also diverse. For each new wiring method added, the length and shape of the bridge need to be customized specifically. Moreover, during the test phase, the bridge needs to repeatedly change the connection method and conduct tests. To improve the versatility of the bridge 5, it is necessary to design a length-adjustable bridge 5 structure that can adaptively adjust its own bridge size according to the actual situation to meet this test requirement. Once the bridge 5 has the characteristics of contraction and elongation, problems such as poor contact will inevitably occur, and this problem also needs to be solved. The specific solution for the length-adjustable bridge 5 designed in this scheme is as follows:

[0048] As Figure 5 、 6 、7, the distance between the a-wiring hole 19 and the b-wiring hole 31 of the bridge 5 structure in this scheme is adjustable, so that the conductive bridge 5 can detachably electrically connect any two adjacent wiring seats horizontally, vertically, or diagonally.

[0049] The conductive bridge 5 includes an a-conductive sheet 18, a b-conductive sheet 30, a conductive elastic sheet 7, and a sliding sleeve 22; the a-wiring hole 19 and the b-wiring hole 31 are respectively located at the ends of the a-conductive sheet 18 and the b-conductive sheet 30 that are far away from each other. The ends of the a-conductive sheet 18 and the b-conductive sheet 30 that are close to each other are movably sleeved in the movable channel 21 inside the sliding sleeve 22. Guide grooves 20 are arranged along the length direction on both sides inside the movable channel 21, and the two side edges of the a-conductive sheet 18 and the b-conductive sheet 30 are in guiding cooperation with the guide grooves 20 on both sides inside the movable channel 21; on the sides of the a-conductive sheet 18 and the b-conductive sheet 30 that are close to each other, an a-conductive bar 26 and a b-conductive bar 28 that are parallel to each other and arranged at a distance are integrally connected respectively;

[0050] A hollow window 60 is provided in the middle section of the upper part of the sliding sleeve 22. The conductive elastic sheet 7 is located at the hollow window 60. The two ends of the conductive elastic sheet 7 are respectively bent and folded downward to form an a-pressing part 8 and a b-pressing part 11; the a-pressing part 8 and the b-pressing part 11, and the lower sides of the a-pressing part 8 and the b-pressing part 11 are respectively the a-conductive bar 26 and the b-conductive bar 28.

[0051] The conductive bridge 5 further includes a rotating cylinder 70, an axial pre-tightening force spring 15, a stud 10, and a guide rod 24;

[0052] A bearing hole 23 is provided at the center of the bottom wall 22A of the sliding sleeve 22, and the upper end of the rotating cylinder 70 is rotationally fitted with the bearing hole 23 through a bearing 25; an outer ring of the upper end of the rotating cylinder 70 is integrally provided with a gear 16, and the gear 16 is located between the a conductive strip 26 and the b conductive strip 28; on one side of the a conductive strip 26 and the b conductive strip 28 close to each other, an a driving tooth body array 27 and a b driving tooth body array 29 are respectively arranged along the length direction; the gear 16 meshes with the a driving tooth body array 27 and the b driving tooth body array 29 at the same time. When the gear 16 rotates actively, under the engagement drive, the a conductive strip 26 and the b conductive strip 28 make relative movements along the length direction; a threaded hole 17 penetrating up and down coaxially with the axis is provided in the integral structure formed by the gear 16 and the rotating cylinder 70, and the external thread of the lower section of the stud 10 is in threaded fit with the threaded hole 17; the upper end of the stud 10 is integrally connected with a bolt head 13 that can be screwed by a screwdriver, and an upper chuck 9 and a lower chuck 14 are integrally fixed on the upper part of the stud 10. A hollow opening 6 is provided at the center of the conductive elastic sheet 7, the stud 10 passes through the hollow opening 6 movably, and the conductive elastic sheet 7 can be movably clamped between the upper chuck 9 and the lower chuck 14; a rotation prevention opening 12 is provided at the edge of the conductive elastic sheet 7, and the hollow opening 6 of the guide rod 24 passes through the rotation prevention opening 12 upward movably, and the lower end of the guide rod 24 is fixedly connected to the bottom wall 22A of the sliding sleeve, so that the guide rod 24 plays a role in preventing the conductive elastic sheet 7 from rotating around the axis of the hollow opening 6.

[0053] The axial preloading spring 15 is sleeved on the lower part of the stud 10, and the upper and lower ends of the preloading spring 15 elastically press against the lower chuck 14 and the gear 16 respectively, so that the integral structure formed by the gear 16 and the rotating cylinder 70 is subjected to an axial preloading force, so that there is an axial preloading force from the axial preloading spring 15 in the threaded fit between the external thread of the stud 10 and the internal thread of the threaded hole 17. This axial preloading force forms a frictional resistance that hinders the relative rotation between the external thread of the stud 10 and the internal thread of the threaded hole 17, and the greater the preloading force, the greater the frictional resistance that hinders the relative rotation between the two. Therefore, in the free state, the gear 16 and the rotating cylinder 70 will rotate synchronously with the stud 10 under the action of the static friction force during the threaded fit;

[0054] When the positions of the a conductive sheet 18 and the b conductive sheet 30 are completely locked, the gear 16 is completely locked under the common rigid constraints of the a driving tooth body array 27 and the b driving tooth body array 29. At this time, if the stud 10 is forcibly rotated downward and tightened, the stud 10 will be forced to move downward under the driving of the thread. The downward displacement of the stud 10 causes the upper chuck 9 to forcibly press against the middle part of the conductive elastic sheet 7 downward, so that the a pressing part 8 and the b pressing part 11 of the conductive elastic sheet 7 respectively press against the a conductive strip 26 and the b conductive strip 28 downward elastically and tightly; the a conductive sheet 18 and the b conductive sheet 30 are stably electrically connected under the elastic pressing fit of the conductive elastic sheet 7.

[0055] Working principle of the conductive bridge 5 and initial state of the conductive bridge 5: To enable the smooth relative displacement between the a conductive strip 26 and the b conductive strip 28, in the initial state, the a pressing portion 8 and the b pressing portion 11 of the conductive elastic piece 7 are respectively in a non-contact or non-pressure contact state with the underlying a conductive strip 26 and b conductive strip 28, thus avoiding the frictional force formed by the a pressing portion 8 and the b pressing portion 11 respectively tightly pressing the underlying a conductive strip 26 and b conductive strip 28, and further avoiding the problem that the a conductive strip 26 and the b conductive strip 28 cannot have a smooth relative displacement. However, in this state, there is a problem of poor contact of the conductive elastic piece 7;

[0056] When it is necessary to electrically connect any two adjacent terminal blocks, first lock the a connection hole 19 of the conductive bridge 5 to the conductive bridge locking hole 4 on one of the terminal blocks through a bolt. At this time, if the distance between this terminal block and another adjacent terminal block is too long or too short, it will cause the b connection hole 31 of the conductive bridge 5 to be unable to align with the corresponding conductive bridge locking hole 4; at this time, turn the bolt head 13 with a screwdriver to rotate the stud 10. Since there is an axial pre-tightening force from the axial pre-tightening force spring 15 in the thread fit between the external thread of the stud 10 and the internal thread of the threaded hole 17, this axial pre-tightening force forms a frictional resistance that hinders the relative rotation between the external thread of the stud 10 and the internal thread of the threaded hole 17. Therefore, in this state, the gear 16 and the rotating cylinder 70 will rotate synchronously with the stud 10 under the action of the static frictional force during the thread fit, and then, under the transmission of the meshing of the gear 16, the a conductive strip 26 and the b conductive strip 28 make a relative movement along the length direction, thereby realizing the adjustment of the distance between the a connection hole 19 and the b connection hole 31 until the b connection hole 31 of the conductive bridge 5 aligns with the corresponding conductive bridge locking hole 4, and then lock the b connection hole 31 to the conductive bridge locking hole 4 on the other terminal block through a bolt;

[0057] At this point, the positions of the a conductive piece 18 and the b conductive piece 30 are completely locked, and the gear 16 is completely locked under the common rigid constraint of the a driving tooth body array 27 and the b driving tooth body array 29 and cannot rotate. At this time, if the bolt is used to forcibly rotate the stud 10 downward, the stud 10 will be displaced downward under the transmission of the thread. The downward displacement of the stud 10 forces the upper chuck 9 to press downward on the middle part of the conductive elastic piece 7, so that the a pressing portion 8 and the b pressing portion 11 of the conductive elastic piece 7 respectively press downward and elastically tightly on the a conductive strip 26 and the b conductive strip 28; the a conductive piece 18 and the b conductive piece 30 are stably electrically connected under the elastic pressing fit of the conductive elastic piece 7; thus realizing an adaptive bridge connection.

[0058] The above is only the preferred embodiment of the present invention. It should be noted that: for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. The adjustable terminal box system with multiple wiring modes for the permanent magnet motor test platform is characterized by: The junction box includes a U-phase wiring seat array, a V-phase wiring seat array and a W-phase wiring seat array which are distributed in parallel; The U-phase terminal block array, the V-phase terminal block array and the W-phase terminal block array are all composed of a plurality of terminal blocks distributed in an array and independent of each other; the power lines of each phase and the plurality of lead wires of the permanent magnet motor winding are electrically connected to the terminal blocks respectively; The junction box also includes a horizontally placed metal conductive bar placed horizontally on one side of the U-phase wiring seat array, the V-phase wiring seat array and the W-phase wiring seat array; the wiring seats of the U-phase wiring seat array, the V-phase wiring seat array and the W-phase wiring seat array close to one end of the metal conductive bar can be electrically connected to the metal conductive bar through a detachable conductive bridge; Any two adjacent wiring blocks in the U-phase wiring block array, the V-phase wiring block array and the W-phase wiring block array can be electrically connected to each other through a detachable conductive bridge; The two ends of the conductive bridge are respectively provided with hollow wiring holes a and b; the wiring holes a and b can be locked on the locking holes of the conductive bridge on any wiring seat by bolts; The conductive bridge comprises a conductive sheet, b conductive sheet, conductive spring sheet and a sliding sleeve; a wiring hole and b wiring hole are respectively located at the ends of a conductive sheet and b conductive sheet that are far away from each other, and the ends of a conductive sheet and b conductive sheet that are close to each other are movably sleeved in a movable channel in the sliding sleeve, and guide grooves are arranged on both sides of the movable channel along the length direction, and the two side edges of a conductive sheet and b conductive sheet are guided and matched with the guide grooves on both sides of the movable channel; the sides of a conductive sheet and b conductive sheet that are close to each other are respectively connected with a conductive strip a and a conductive strip b that are parallel to each other and arranged at a distance; a hollow window is arranged in the middle section of the upper part of the sliding sleeve, and the conductive spring sheet is located at the hollow window, and the two ends of the conductive spring sheet are respectively bent downward to form a top pressing part a and a top pressing part b; the bottom sides of the top pressing part a and the top pressing part b are respectively the conductive strip a and the conductive strip b; The conductive bridge also includes a rotating cylinder, an axial preload spring, a stud and a guide rod; a bearing hole is provided in the center of the bottom wall of the sliding sleeve, and the upper end of the rotating cylinder rotates with the bearing hole through a bearing; a gear is integrally provided on the outer ring of the upper end of the rotating cylinder, and the gear is between the conductive strip a and the conductive strip b; the side edges of the conductive strip a and the conductive strip b that are close to each other are respectively provided with a transmission tooth array a and a transmission tooth array b along the length direction; the gears mesh with the transmission tooth array a and the transmission tooth array b at the same time, and when the gears rotate actively, the conductive strip a and the conductive strip b make relative motion along the length direction under the meshing transmission.

2. The adjustable junction box system with multiple wiring modes for the permanent magnet motor test platform according to claim 1 is characterized in that: The number and layout of the terminals of the U-phase terminal block array, the V-phase terminal block array and the W-phase terminal block array are all the same; and a plurality of conductive bridge locking holes are provided on each terminal block and the conductor of the metal conductive bar.

3. The adjustable junction box system with multiple wiring modes for the permanent magnet motor test platform according to claim 2 is characterized in that: The U-phase terminal block array includes at least five terminal blocks, which are respectively denoted as U terminal block, U1-1 terminal block, U1-2 terminal block, U2-1 terminal block and U2-2 terminal block; The V-phase terminal block array includes at least five terminal blocks, which are respectively denoted as V terminal block, V1-1 terminal block, V1-2 terminal block, V2-1 terminal block and V2-2 terminal block; The W-phase terminal block array includes at least five terminal blocks, which are respectively denoted as W terminal block, W1-1 terminal block, W1-2 terminal block, W2-1 terminal block and W2-2 terminal block; The U terminal block, the V terminal block and the W terminal block are electrically connected to the U-phase, V-phase and W-phase power lines respectively.

4. The adjustable junction box system with multiple wiring modes for the permanent magnet motor test platform according to claim 1 is characterized in that: The integrated structure formed by the gear and the rotating cylinder is provided with a threaded hole that passes through the upper and lower parts along the axis coaxially, and the external thread of the lower section of the stud is matched with the thread of the threaded hole; the upper end of the stud is integrally connected with a bolt head that can be twisted by a screwdriver, and the upper part of the stud is integrally fixed with an upper chuck and a lower chuck, and a hollow opening is provided in the center of the conductive spring sheet, and the stud moves through the hollow opening, and the conductive spring sheet can be movably clamped between the upper chuck and the lower chuck; a stop opening is provided at the edge of the conductive spring sheet, and the hollow opening of the guide rod moves upward through the stop opening, and the lower end of the guide rod is fixedly connected to the bottom wall of the sliding sleeve; The axial preload spring is sleeved on the lower part of the stud, and the upper and lower ends of the preload spring elastically press the chuck and the gear respectively, so that the integrated structure formed by the gear and the rotating cylinder is subjected to axial preload, so that the threaded fit between the external thread of the stud and the internal thread of the threaded hole has an axial preload from the axial preload spring. The axial preload forms a friction resistance between the external thread of the stud and the internal thread of the threaded hole to hinder the relative rotation of the two. In a free state, the gear and the rotating cylinder will rotate synchronously with the stud under the action of the static friction force when the threads fit. When the positions of conductive sheet a and conductive sheet b are completely locked, the gears are completely locked under the common rigid constraints of transmission tooth array a and transmission tooth array b. At this time, if the stud is forced to rotate downward to tighten, the stud will be forced to move downward under the transmission action of the thread. The downward displacement of the stud causes the upper chuck to forcefully press the middle part of the conductive spring sheet downward, so that the a pressing part and the b pressing part of the conductive spring sheet elastically and tightly press the conductive strip a and the conductive strip b downward respectively; the conductive sheet a and the conductive sheet b are stably electrically connected under the elastic pressing cooperation of the conductive spring sheet.

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