Permanent magnet traction motor stator forming coil expansion test device and test method

Abstract

The present invention discloses a permanent magnet traction motor stator forming coil expansion test device and test method, including: at least one tension and compression component to assist in forming transition edges; at least one torsion component, arranged in the tension or compression direction of the tension and compression component, for forming transition fillets and nose ends; at least one bending component, including a bending head that can move linearly in a direction perpendicular to the line connecting the two end points of the test piece, so as to form straight edges and transition edges in a four-point or three-point pressurization manner; load, displacement, torque, and angle sensors are correspondingly arranged on the three components. The single working condition test and the composite working condition test components of tension-bending, torsion-bending, and tension-torsion are integrated into one and have interchangeability and combination, meeting the test requirements of coil sequential tension-bending and torsion-bending expansion. The relationship between load, loading time, load holding time, coil length and coil deformation and rebound change law can be tested in large quantities.

Description

Technical Field

[0001] The invention belongs to the technical field of rail transit permanent magnet traction motor stator manufacturing, and specifically relates to a device and a test method for a permanent magnet traction motor stator forming coil expansion test. Background Art

[0002] As the core driving component of modern transportation equipment, permanent magnet traction motor has high power density and high reliability. As an important component of permanent magnet traction motor, stator forming coil is made of electromagnetic wire made of copper wire wrapped with polyimide film as the manufacturing material on the expansion equipment.

[0003] The stator forming coil expansion process is complicated, such as Figure 1 As shown, the rounded rectangular or shuttle-shaped coil 500 on the left needs to be formed into a diamond-shaped coil with a three-dimensional geometric shape on the right, including the straight edge 1, transition edge 2, transition fillet 3, and nose end 4. The transition edge 2, transition fillet 3, and nose end 4 have curved and twisted features, with a stretched straight edge 1 in the middle. The expansion process directly affects the dimensional accuracy of the coil and the effectiveness of the subsequent assembly process.

[0004] Due to the elastic-plastic properties of the stator forming coil material, after the expansion manufacturing is completed, residual stress is easily released to produce springback, and the shape and size change, resulting in the coil's geometric shape and size parameters being unable to meet the assembly process size requirements, or causing the insulation layer to be squeezed and damaged. The above problems will directly lead to short-circuit burning between the turns of the stator forming coil, seriously threatening the safe operation of the permanent magnet traction motor. Therefore, a large number of tests are required in the early stage of the coil expansion process to ensure the reasonable design of the structural parameters of each part. By analyzing the influence of material rebound after unloading on the size of the forming coil, the expansion process parameters are optimized to provide a test basis for the stator forming coil expansion manufacturing, and ensure the high power density and insulation performance of the permanent magnet traction motor.

[0005] However, the operation of the forming expansion machine on the coil is only to achieve the tensile displacement and angular deformation of the coil by driving the motor using the position loop control. There is no way to consider the real-time impact of tensile load, bending load and deformation on the coil in the processing engineering. The true value of load, displacement and deformation cannot be mapped in the coil processing, and the error transmission, error accumulation and compensation error of mechanical equipment cannot be considered. The processing error is large, it is difficult to ensure the manufacturing accuracy of the coil, and it is impossible to consider the impact of different processing sequences and processes on the coil.

[0006] In order to meet the universal requirements, the current traditional mechanical test bench has a fixed size for the test specimens. The various sizes of the specimens are usually related to the stroke of the action end and the fixed size of the design, making it difficult to test the sizes of multiple materials of the same type. In particular, the stator forming coil includes a straight part and a nose part, which is a complex irregular torsion and stretching structure, and cannot be tested on a traditional mechanical test bench.

[0007] At the same time, traditional mechanical test benches monitor fewer physical quantities and the physical quantities obtained are not comprehensive. For example, most of them can only stretch and bend independently. Even for composite test benches, composite tests of stretching and bending can be reflected, but stretching and torsion cannot be reflected at the same time. During the expansion process, the stator forming coil forms transition edges and straight edges through torsion-bending conditions, and it is necessary to reflect the comprehensive mechanical performance characteristics under various conditions. However, traditional test benches cannot fully explore the weight of forming influencing factors on the specimen forming process, and it is difficult to truly map them in industrial applications.

[0008] In order to ensure universality, the transmission structure of traditional test benches is limited. Worm gears and gear pairs are mostly used for transmission. The transmission efficiency is low, and the transmission ratio should not be too large, which accumulates various mechanical transmission errors. In addition, due to the use requirements when the load is too large, the transmission energy will be lost in friction and heat. At the same time, the motor is usually open-loop controlled, and the position error cannot be adjusted in real time. It is easy to accumulate errors, which affects the accuracy and stability of the position in high-speed motion and high torque output.

[0009] In addition, part of the transmission mechanism of the traditional test bench is basically exposed to the air and is easily affected by external factors such as dust and corrosion, which leads to reduced accuracy and shortened life, and causes large positioning errors. During the stator forming coil test process, it is easy to cause the execution end to over-position, making it impossible to accurately judge the deformation of the specimen. Summary of the invention

[0010] The purpose of the present application is to provide a permanent magnet traction motor stator forming coil expansion test device and test method to meet the expansion requirements of stator forming coils of different sizes, explore the expansion process, clarify the mechanical characteristics of coil expansion, decompose the stator forming coil electromagnetic wire stretching-torsion-bending expansion process, test the electromagnetic wire material under various working conditions, explore the change law of electromagnetic wire geometric size change and torque, loading time, holding time, coil length, deformation, etc., study the relationship between multiple physical parameters, map the test parameters and manufacturing parameters to each other to obtain optimized expansion process parameters, analyze the influence of material rebound after unloading on the size of the forming coil, optimize the expansion process parameters, provide a test basis for the stator forming coil expansion manufacturing, and ensure the high power density and insulation performance of the permanent magnet traction motor.

[0011] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0012] A permanent magnet traction motor stator forming coil expansion test device, characterized by comprising:

[0013] At least one tension and compression assembly is fixed on the base platform in a manner that the arrangement position can be adjusted movably to assist in forming the transition edge;

[0014] At least one torsion assembly is arranged one by one in the tensile or compressive direction of the tension and compression assembly, and can slide and move along the base platform to adjust the relative position with the tension and compression assembly to form a transition fillet and a nose end;

[0015] At least one bending assembly, including a bending head capable of linear movement in a direction perpendicular to a line connecting two end points of the specimen, wherein the projection position of the bending head on the base platform can be adjusted so as to be combined with the tension-compression assembly and / or the torsion assembly in a four-point or three-point pressurization manner to form a straight edge and a transition edge;

[0016] Load sensors, displacement sensors, torque sensors, and angle sensors are provided on the three components to obtain the load, displacement, and deformation parameters of the formed coil specimen during the above-mentioned processing.

[0017] In the above technical solution, all three components can work independently, and the torsion component and the bending component are configured to be able to be simultaneously combined into the working space of the tension and compression component in a manner in which at least one component participates so as to perform coil expansion processing tests on the formed coil specimens in different processing sequences.

[0018] In the above technical solution, a number of parallel spaced slide grooves are arranged on the basic platform, and both the tension and compression components and the torsion components are fixed by T-slot fixings. The bottom of the T-slot fixings has a ground sliding block that can move along the slide grooves. The tension and compression components and the torsion components are arranged to be combined and position-adjusted by the T-slot spacing.

[0019] In the above technical solution, the tension and compression assembly, the torsion assembly, and the bending assembly all use servo motors connected to planetary reducers to form a power output module.

[0020] In the above technical solution, in the tension and compression assembly, the power output module is connected to the guide rail slider module; the guide rail slider module includes a screw slider, a guide rail, a fixed end chuck, and a movable end chuck arranged in a straight line with the fixed end chuck, and the movable end chuck is constrained on the guide rail by a slider and can slide linearly along the guide rail.

[0021] In the above technical solution, a grating scale displacement sensor is arranged along the guide rail in the tension and compression assembly, wherein the two ends of the scale grating are respectively fixed to the two ends of the guide rail, and the indicator grating is installed on the movable end chuck, which is used to move with the specimen to measure the elongation; the first tension and compression sensor is installed on the movable end chuck, which is used to move with the specimen to measure the tensile force during stretching.

[0022] In the above technical solution, in the torsion assembly, on the rear extension line of the power output module, the torsion action end chuck and the torsion fixed end chuck are arranged in a straight line at intervals, the power output module is connected to the torsion action end chuck, and a torsion chuck return to zero limit structure is provided at the torsion fixed end chuck to limit the radial activity range of the torsion chuck; the angular torque sensor is arranged between the output end of the planetary reducer of the power output module and the torsion action end chuck.

[0023] In the above technical solution, the chucks of each component include multiple types, including chucks for clamping straight edges, and chucks each having a receiving groove for accommodating the initial folded state of the coil and the nose end.

[0024] In the above technical solution, the torsion action end chuck and the movable end chuck are both movably and detachably fixed on the base platform by T-slot fixing parts.

[0025] In the above technical solution, the bending head of the bending assembly is arranged vertically or horizontally along the telescopic direction, the output end of the power output module is connected to the physical center of the balance plate arranged perpendicular to the telescopic direction, and two rib-shaped convex tops are arranged axially symmetrically on the lower surface of the balance plate with the physical center of the balance plate as the midpoint, or a rib-shaped convex top is arranged in the middle, and the convex top is arranged along the direction of pressure expansion or lifting and stretching, and the outer edge of the lowest part maintains a thickness suitable for contact with the coil and pressing down. According to different bending requirements, different bending heads are replaced, or the spacing between the two rib-shaped convex tops is adjusted to achieve one-point force application or two-point force application at different distances, thereby ensuring the replaceability of the device.

[0026] In the above technical solution, a tension and compression sensor is arranged at the output end of the lifting power device, and a laser displacement sensor is arranged on the basic platform just below the center of the balance plate to ensure that the laser displacement sensor is arranged just below the material to be measured.

[0027] In the above technical solution, the lifting power output module is one of a cylinder, a hydraulic cylinder, or a lead screw and guide rail assembly.

[0028] In the above technical solution, a control assembly having a host computer, a PLC and a driver is arranged below the basic platform or separately, and the host computer is connected to each sensor and each power output module through a data acquisition circuit.

[0029] In the above technical solution, the control assembly is also provided with a control unit, an input unit and an output unit; the signal transceiver end of the control unit is connected to the signal transceiver end of the signal processing unit, and the control unit is used to receive and process sensor data and send motor control signals; the signal output end of the input unit is connected to the signal input end of the control unit, and the input unit is used to convert user operations into control signals and send them to the control unit; the signal output end of the control unit is connected to the signal input end of the output unit, and the output unit is used to display the data output by the control unit to the user.

[0030] The present invention also provides an expansion test method using the above-mentioned permanent magnet traction motor stator forming coil expansion test device, collecting load, displacement, and deformation parameters during the expansion test of the specimen and analyzing the test results in combination with the coil deformation, and the expansion test method includes at least the following:

[0031] A separate tensile test, a separate torsion test, a separate bending test, and:

[0032] Torsion-bending test: The specimen is subjected to bending moment during torsion. According to the load sequence, the torsion-bending test conditions include: twisting first and then bending, bending first and then twisting, and twisting and bending at the same time. The specimen is subjected to bending moment during torsion. The thrust generated by the bending head is constant and does not rotate. By adjusting the number or distance of convex tops on the bending head, one or two points of force are applied on the specimen to perform three-point bending or four-point bending tests.

[0033] Tensile-torsion test: The specimen is subjected to torque during the stretching process. The tensile-torsion test conditions are divided into: stretching first and then torsion, torsion first and then stretching, and simultaneous stretching and torsion.

[0034] In the above method, the stretching of the formed coil is to apply tensile force to the semicircular arcs at both ends of the rounded rectangular coil to stretch the coil as a whole; the nose of the formed coil is formed by the semicircular arcs at both ends of the shuttle coil through a twisting process, and the straight edge of the formed coil is formed by the straight edge of the rounded rectangle through a bending process.

[0035] The above-mentioned expansion test method of the permanent magnet traction motor stator forming coil expansion test device comprises the following steps:

[0036] S1: Build the test device, S2: Prepare the test piece; S3: Clamp the test piece on the tension and compression component and the torsion component respectively; S4: Coil expansion test, input the control parameters on the control assembly, and the control assembly sends the control parameters to each actuator in the test device; S5: Data analysis and processing, during the test, the system outputs the tensile end tension F1, bending end thrust F2, tensile displacement D1, bending deflection D2, torque T, torque loading time t1, torque holding time t2, thrust loading time t3, thrust holding time t4, tensile tension F3, tensile displacement D3, rotation angle γ, rotation angle θ data, and the user analyzes the data.

[0037] In the above technical solution, S4 includes S41: the tensile test steps are: after clamping the specimen, installing the extensometer, marking the original gauge length and setting the test force zero point; then clamping the specimen, performing a tensile test to obtain the yield load value for data analysis and processing.

[0038] In the above technical solution, S4 includes S42: the torsion test steps are: setting the output torque and angle control range after installing the test piece; collecting torsion rebound data; torque T, loading time t1, holding time t2, rotation angle θ.

[0039] In the above technical solution, S4 includes S43: the bending test steps are as follows: the specimen is subjected to bending moment during the bending process, and the thrust generated at the bending end is constant and does not rotate; by adjusting the number or distance of convex tops on the bending fixture, force is applied at one or two points of the specimen to perform three-point bending or four-point bending; marking the initial gauge length of the coil; adjusting the bending end fixture, manually adjusting the distance between the two acting pressure heads on the four-point bending special fixture, and then aligning the pressure head with the marked point by adjusting the position of the electric cylinder bracket; bending test and data collection; the system outputs thrust F2, bending deflection D2, loading time t1, holding time t2, coil length L c And other data information.

[0040] In the above technical solution, S4 includes S44: stretching-bending test, the specimen is subjected to bending moment during stretching. The stretching-bending test has load timing, and the test conditions include: stretching first and then bending, bending first and then stretching, and stretching and bending at the same time.

[0041] In the above technical solution, S4 includes S45: torsion-bending test, the specimen is subjected to bending moment during torsion. The torsion-bending test has load timing, and the test conditions include: torsion first and then bending, bending first and then torsion, and torsion and bending at the same time. The specimen is subjected to bending moment during torsion, and the thrust generated at the bending end is constant and does not rotate; by adjusting the distance between the convex tops on the bending fixture or the number of installations, force is applied at one or two points of the specimen to perform three-point bending or four-point bending.

[0042] In the above technical solution, S4 includes S46: stretch-torsion test, the specimen is subjected to torque during the stretching process. The stretch-torsion test has load timing, and the test conditions include: stretching first and then torque, torque first and then stretching, and stretching and torque at the same time.

[0043] The embodiments of the above test methods are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The methods of the invention can be used to implement the present invention on the basis of adjusting the processing sequence. Therefore, the protection scope of the present invention is not limited to the above embodiments.

[0044] Compared with the prior art, the beneficial effects of this application are:

[0045] 1. The present invention provides a permanent magnet traction motor stator forming coil expansion test device and test method. Through experimental research on the stator forming coil electromagnetic wire material, the applied load, applied time, load holding time and deformation variation law are analyzed, the stress-strain relationship of the material under multiple working conditions is found, the expansion parameters of each working condition are optimized, and an optimized expansion plan is proposed to improve the consistency rate of batch expansion manufacturing products and improve the safety of permanent magnet traction motors.

[0046] 2. The present invention integrates three single working condition test components of stretching, torsion and bending and composite working condition test components of stretching-bending, torsion-bending and stretching-torsion on a basic platform. Stretching, torsion and bending can be further combined according to the T-slot spacing. For example, the bending component can be arranged parallel to the basic platform; it has good interchangeability; and proposes a test method for studying the relationship between load, loading time, holding time, coil length and coil deformation and rebound change law, which meets the test requirements of coil stretching-bending and torsion-bending expansion.

[0047] 3. The material of the stator forming coil electromagnetic wire is copper, and the material cost involved in using the coil is high. The research on the expansion test mechanism by the present invention can effectively reduce the test cost, quickly explore the expansion mechanism of a certain expansion process, and reduce the time cost. It avoids the huge cost of the direct processing test effect of the expansion machine and the defects of unstable and inaccurate test results afterwards.

[0048] 4. The present invention can realize multi-channel data acquisition of six physical parameters such as tension, tensile displacement, torque, angle, bending force, and bending disturbance, and can acquire and display data in the test process in real time, with easy operation; it overcomes the problem that the general mechanical platform cannot be applied to the special shape of the coil and cannot meet the test requirements. The whole detection process has a high degree of automation, which meets the test requirements of the stator forming coil under various working conditions and promotes the development of permanent magnet traction motor manufacturing technology for rail transit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 It is a schematic diagram of the structure of a formed coil from an initial state to an expanded state in the prior art.

[0051] Figure 2 This is the overall structural diagram of the permanent magnet traction motor stator forming coil expansion test device of the present invention.

[0052] Figure 3 This is a mechanical assembly structure diagram of the permanent magnet traction motor stator forming coil expansion test device of the present invention.

[0053] Figure 4 It is a structural principle diagram of the present invention.

[0054] Figure 5 It is a schematic diagram of the interchangeable T-shaped fastener structure of the present invention.

[0055] Figure 6 for Figure 3 Top view of the .

[0056] Figure 7 It is a schematic diagram of the assembly of the indicating grating and the reading grating in the grating ruler of the present invention.

[0057] Figure 8 It is a schematic diagram of the stretching process of the grating ruler and the test piece in the stretching working condition of the present invention.

[0058] Fig. 9 It is a schematic diagram of an embodiment of a combination of tensile and bending components of a test device of the present invention.

[0059] Fig.10 It is an assembly diagram of an embodiment of a tensile-torsion-bending composite working condition test device of the test device of the present invention.

[0060] Fig.11 It is a schematic diagram of the clamp structure of the torsion process of the present invention.

[0061] Fig.12 for Fig.11 Split diagram of .

[0062] Fig.13 It is a schematic diagram of the torsion chuck support base and the torsion process of the test piece in the torsion working condition of the present invention.

[0063] Fig.14It is a schematic diagram of an embodiment of the combination of torsion and bending components of the test device of the present invention.

[0064] Fig.15 Schematic diagram of two bending pressure head structures of the present invention.

[0065] Fig.16 It is a schematic diagram of the bending process of the bending chuck of the present invention and the test piece in the bending working condition (four-point pressing).

[0066] Fig.17 This is a schematic diagram of clamping a tensile chuck in the tensile-bending process of the present invention.

[0067] Fig.18 The working principle of the tensile chuck.

[0068] Fig.19 It is a schematic diagram of the torsion-bending working condition before loading (a) and a schematic diagram of the torsion-bending working condition after loading (b). Fig.19 (c) is the bending chuck for torsion-bending working condition.

[0069] Fig. 20 It is a schematic diagram of the loading process of the tensile-torsion working condition of the present invention.

[0070] Fig.21 It is a schematic diagram of the stretching-twisting-bending process of the shuttle coil to the formed coil of the present invention. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application. The features and performance of the present application will be further described in detail below in combination with the embodiments.

[0072] Example 1

[0073] The permanent magnet traction motor stator forming coil expansion test device implemented according to the present invention is as follows Figure 2-21 As shown, it includes two parts: a mechanical assembly 10 and a control assembly 40. Figures 2 to 6 The mechanical assembly 10 includes a basic platform 100 with a T-slot, a stretching assembly 1, a torsion assembly 2, and a bending assembly 3; the control assembly 40 includes a signal processing unit and a control unit; and the power supply is used to provide driving force to the entire device;

[0074] The working surface of the basic platform 100 with T-slots is placed horizontally; a set of parallel slots is set on the upper surface of the basic platform 100, which is used to pass T-bolts 600 with feet and fix various special brackets on the basic platform 100. The longitudinal direction along the T-slots is the left-right direction; the vertical direction is the up-down direction perpendicular to the surface of the basic platform 100. See the schematic diagram of the connection between the T-bolts 600 and the basic platform 100 for details. Figure 5 .

[0075] See also Figures 2 to 10 , Fig.17 , Figure 19-21 The stretching assembly includes a first servo motor 101, a first servo motor fixed seat 102, a first planetary reducer 103, a first coupling 104, a guide rail slider module base 105, a guide rail slider module 106, a stretching chuck moving end base 107, a stretching moving end chuck 109, a tension sensor 108, a grating scale displacement sensor 110, a grating scale fixed bracket 111, a stretching chuck fixed end base 113, and a stretching fixed end chuck 112.

[0076] The first servo motor fixing base 102, the guide rail slider module base 105, the grating ruler fixing bracket 111, and the tensile chuck fixing end base 113 are fixed on the basic platform 100 by T-bolts respectively;

[0077] The first servo motor 101 is connected to the servo motor fixing seat 102, and the servo motor fixing seat 102 is used to fix the first servo motor 101 on the basic platform 100; the first servo motor 101 is used to provide torque to the guide rail slider module 106; the input end of the first planetary reducer 103 is connected to the first servo motor 101, and the output end of the first planetary reducer 103 is connected to the guide rail slider module 106, and the first planetary reducer 103 is used to provide a constant reduction ratio for the first servo motor 101; the first coupling 104 is used to connect the first planetary reducer 10 3 and the lead screw of the guide rail slider module 106; the guide rail slider module 106 is connected to the guide rail slider module base 104, and the guide rail slider module 106 is used to convert the rotation output by the first servo motor 101 into a linear movement of the mobile platform of the guide rail slider module 106; the special chuck for stretching includes a stretching movable end chuck 109 and a stretching fixed end chuck 112, and the special chuck for stretching is used to clamp the material to be tested for stretching test; the stretching movable end chuck 109 is connected to the tension sensor 108, and the stretching fixed end chuck 112 is connected to the stretching chuck fixed end base 113.

[0078] The guide rail slider module base 105 is used to fix the guide rail slider module 106 on the basic platform 100; the grating scale fixing bracket 111 is used to fix the grating scale displacement sensor 110 on the basic platform 100; the stretching chuck moving end base 107 is fixed to the moving platform 1061 of the guide rail slider module 106 with fasteners, and is used to fix the tension sensor 108 and the stretching moving end chuck 109; the stretching chuck moving end base 107 is used to fix the stretching moving end chuck 109 on the moving platform 1061 of the guide rail slider module 106; the stretching chuck fixed end base 113 is used to fix the stretching fixed end chuck 112 on the basic platform 100.

[0079] The grating scale displacement sensor 110 is arranged on the guide rail slider module 106, wherein the two ends of the long grating 1101 (scale grating) are respectively mounted on two grating scale fixing brackets 111, and the short grating 1102 (indicator grating) is mounted on the moving platform 1061 of the guide rail slider module 106. The grating scale displacement sensor 110 is used to measure the elongation of the material; the stretching assembly tension sensor 108 is mounted on the base of the stretching chuck moving end and connected to the stretching moving chuck, and is used to measure the tension applied to the material during stretching.

[0080] See also Fig.17 and Fig.18 The two wedges 1091 of the stretching movable end chuck 109 and the stretching fixed end chuck 112 are clamped, and the two force arms on the wedges 1091 are rotated to push the wedges to lock, and the rectangular block 1092 is tightened on the specimen 700 by screws to prevent the specimen 700 from loosening during the stretching process.

[0081] like Figure 2-14 As shown in FIGS. 19-21 , in the torsion assembly, the second servo motor fixing seat 202 , the angle torque sensor bracket 206 , the torsion end chuck bracket 207 , the angle torque sensor bracket 206 and are respectively fixed on the base platform 100 with special T-bolts 500 , and are respectively used to fix the servo motor 201 , the angle torque sensor 205 , the torsion chuck support seat 208 , and the torsion fixed end chuck 210 .

[0082] The stretching movable end chuck 109 and the stretching fixed end chuck 112 are installed at the same horizontal height; the output shaft of the second servo motor 201, the output shaft of the second planetary reducer 203, the output shaft of the angle torque sensor 205, the center of the torsion action end chuck 209 and the center of the torsion fixed end chuck 210 are installed on the same horizontal straight line and parallel to the working surface of the base platform 100.

[0083] The second servo motor 201 is connected to the servo motor fixing seat 202, and the second servo motor 201 provides torque; the input end of the second planetary reducer 203 is connected to the second servo motor 201, and the output end of the second planetary reducer 202 is connected to the angle torque sensor 205, and the planetary reducer 203 is used to provide a constant reduction ratio for the servo motor 201; the coupling 204 is used to connect the output end of the planetary reducer 203 and the input end of the angle torque sensor 205; the angle torque sensor 205 is a part of the transmission structure, and the output end of the angle torsion sensor is connected to the torsion chuck through a key; the special torsion chuck includes a torsion action end chuck 206 and a torsion fixed end chuck 210, and the special torsion chuck is used to clamp the material to be tested for torsion testing; the torsion action end chuck 209 is connected to the angle torque sensor 205 through a key, and the torsion fixed end chuck 210 is connected to the torsion chuck fixed end base 207.

[0084] The angle torque sensor bracket 206 is used to fix the angle torque sensor 205 on the base platform 100; the torsion end chuck bracket 207 is used to fix the torsion chuck support seat 208 on the base platform 100; the torsion chuck support seat 208 is used to limit the radial range of motion of the torsion chuck; the torsion chuck fixed end base 207 is used to fix the torsion fixed end chuck on the base platform 100.

[0085] The angle torque sensor 205 is disposed between the output end of the second planetary reducer 202 and the torsion chuck, and is fixed on the base platform 100 by an angle torque sensor bracket 206. The angle torque sensor 205 is used to measure the torsion angle and torque of the material to be tested.

[0086] like Figure 10-12 The torsion chuck support seat 208 is used to limit the radial movement of the torsion action end chuck 209. The torsion chuck support seat 208 is divided into two parts, the upper and lower parts. The clamping holes in the upper block 2081 and the lower block 2082 form a complete circle; the diameter of the circle should be slightly smaller than the diameter of the outer circle of the torsion action end chuck 209, and a graphite wool filler 213 is arranged in the gap between the two. The graphite wool filler 213 is in direct contact with the outer edge of the torsion action end chuck 209 for lubrication, preventing rigid contact from aggravating wear and reducing transmission errors, and ensuring that the friction between the graphite wool filler 213 and the outer edge of the torsion action end chuck 209 is small enough.

[0087] like Fig.12 As shown, the torsion chuck zero return limit device 212 has a proximity switch 2120 arranged on the torsion chuck support seat 208. When the proximity end 2121 on the torsion action end chuck 209 is rotated to reach the proximity switch 2120, it is limited to reset the angle of the torsion chuck back to the original position.

[0088] There are many types of clamps for tension and compression assemblies and torque assemblies, including clamps for clamping straight edges (such as Fig.17 ), and a chuck (such as a chuck having a receiving groove for accommodating the initial folded state of the coil and the nose end portion) Fig.19 and 20 ).

[0089] like Figure 2-11 15-21 The bending assembly in this embodiment has two action ends (one of which is redundant), with the same components and loading methods, and is placed vertically with the stretching assembly and the torsion assembly respectively. In practice, it is also possible to set only one bending assembly, such as Fig.13 , Fig.16 , Fig.18 , Fig.19 Example.

[0090] The bending assembly includes a gantry 301, a power module 302 with a drive motor and a third planetary reducer, an electric cylinder 303, a pressure sensor 304, a bending pressure head 305, a laser displacement sensor bracket 306, and a laser displacement sensor 307. The electric cylinder 303 is a lead screw and nut telescopic assembly. Here, the electric cylinder 303 can also be replaced by a precision linear device such as a servo cylinder or a hydraulic cylinder.

[0091] The linear motion mechanism where the bending press head 305 is located is installed on the gantry 301 to ensure that the push rod of the electric cylinder 303 is perpendicular to the plane of the basic platform 100; adjust the installation position of the laser displacement sensor bracket 306 to ensure that the emission and receiving points of the laser displacement sensor 307 are located directly below the electric cylinder push rod.

[0092] You can also Figure 4 As shown, the bending assembly can be arranged parallel to the base platform. The bending press head 305 is arranged horizontally, and the pushing direction is parallel to the base platform 100 and perpendicular to the stretching direction or the center line of the torsion clamp. The gantry 301 is also arranged parallel to the base platform 100.

[0093] Regardless of the setting direction, the driving device and structure are the same. The electric cylinder 303 is connected to the gantry 301, and the electric cylinder 303 is used to push the four-point bending pressure head to feed and move; the four-point bending special pressure head is connected to the pressure sensor 304, and the four-point bending special pressure head is used to perform four-point bending on the material to be tested.

[0094] The laser displacement sensor bracket 306 is used to fix the laser displacement sensor 307 on the basic platform 100; the gantry 301 is used to vertically fix the electric cylinder 303 above the basic platform 100; the basic platform 100 is used to place the components of this assembly.

[0095] The pressure sensor 304 is installed on the push rod of the electric cylinder 303 and is connected to the bending pressure head 305. The pressure sensor 304 is used to measure the pressure applied to the material when it is bent. The laser displacement sensor 307 is set directly below the material to be tested and is fixed on the basic platform 100 by the laser displacement sensor bracket 306. The laser displacement sensor 307 is used to measure the vertical downward pressure distance of the bending of the material to be tested.

[0096] Fig.15 Several structures of the bending pressure head 305 are given. They all include a balance plate physical center vertically connected to the output end of the linear motion power output module, and two rib-shaped convex tops 3051 ( Fig.15 (a)) or a rib-shaped convex top 3051 is provided in the center ( Fig.15(b)), the convex top 3051 is arranged along the direction of pressure expansion or pulling, and the outer edge of the lowest part maintains a thickness suitable for contacting and pressing the coil. The convex top 3051 is arranged to be fixed on the balance plate or adjusted in position by T-bolts 600.

[0097] According to different bending requirements, different bending heads are replaced, or the spacing between the two rib-shaped convex tops is adjusted to achieve one-point force application or two-point force application at different distances, thus ensuring the interchangeability of the device.

[0098] Fig.19 (c) is a bending chuck for torsion-bending working condition. The bending chuck bends the specimen to form a straight edge, and the specimen is tightened from two directions by screws in the vertical and horizontal directions on the chuck (the movable clamp block is clamped by the screws in the vertical direction, and a protective layer can be set on the screw head to protect the specimen). The bending chuck locks the straight edge of the specimen, and the straight edge extends downward from the opening at the bottom of the chuck to the pressing position of the bending loading head. When the torsion end rotates, the specimen is warped to form a transition edge structure, which avoids twisting during torsion.

[0099] like Fig.16 The changing state of the specimen 700 when four-point pressing is performed using a two-point bending indenter is given.

[0100] Control Structure Reference Figure 2-4 The control assembly 40 includes a control unit, an input unit and an output unit; the signal transceiver end of the control unit is connected to the signal transceiver end of the signal processing unit, and the control unit is used to receive and process sensor data and send motor control signals; the signal output end of the input unit is connected to the signal input end of the control unit, and the input unit is used to convert user operations into control signals and send them to the control unit; the signal output end of the control unit is connected to the signal input end of the output unit, and the output unit is used to display the data output by the control unit to the user;

[0101] The control unit includes a control circuit, which includes a motor control circuit and a sensor control circuit; the motor control circuit includes a servo motor control circuit and an electric cylinder control circuit, the servo motor control circuit host computer 4, the PLC controller 5 and the V90 driver 6, the servo motor control circuit is used to perform position control, speed control and torque control on the first and second servo motors, and the electric cylinder control circuit is used to perform position control, speed control and torque control on the electric cylinder 303.

[0102] The signal processing unit includes a data acquisition circuit and a filtering circuit; the signal input end of the filtering circuit is connected to the signal output end of the sensor, and the signal output end of the filtering circuit is connected to the analog-to-digital conversion interface of the data acquisition circuit, and the filtering circuit is used to smooth the signal input to the data acquisition circuit; the signal transceiver end of the data acquisition circuit is connected to the signal transceiver end of the host computer 4, and the data acquisition circuit is used to send sensor data to the host computer and receive control signals from the host computer.

[0103] The test method using the above-mentioned permanent magnet traction motor stator forming coil expansion test device includes the following steps:

[0104] S1: Build the test equipment,

[0105] By fixing the basic platform 100 and adjusting the anchor bolts, ensure that the plane of the basic platform 100 is in a horizontal position;

[0106] The first servo motor fixing base 102, the guide rail slider module base 105, the grating ruler fixing bracket 111, the tensile chuck fixed end base 113, the second servo motor fixing base 202, the angle torque sensor bracket 206, the torsion end chuck bracket 207, the torsion chuck fixed end base 207, the laser displacement sensor bracket 105 and the gantry 301 are fixed on the basic platform 100 by fasteners and special fixing brackets;

[0107] Fix the base platform 100 and adjust the anchor bolts to ensure that the plane of the base platform 100 is in a horizontal position; fix the base 107 of the moving end of the tensile chuck on the moving platform of the guide rail slider module 106 by tightening the bolts; fix the tension sensor 108 on the base 107 of the moving end of the tensile chuck by fasteners;

[0108] The output end of the first planetary reducer 103 is connected to the screw input end of the guide rail slider module 106 through the first coupling 104;

[0109] Fix the tension fixed end chuck 112 on the tension sensor 108 by fastening bolts; fix the angle torque sensor 205 on the angle torque sensor bracket 206 by fastening bolts; fix the graphite wool filler on the inner wall of the torsion chuck support seat 208 by fastening bolts; fix the lower half of the torsion chuck support seat 208 on the torsion end chuck bracket 207 by fastening bolts; place the torsion action end chuck 204 in the circular groove of the lower half of the torsion chuck, and connect the torsion action end chuck 204 to the angle torque sensor 205 by a key;

[0110] Fix the upper part of the torsion chuck support seat 208 to the lower part of the torsion chuck support seat 208 by fastening bolts; fix the electric cylinder 303 to the gantry 301 by fastening bolts; fix the pressure sensor 304 to the push rod of the electric cylinder 303 by fastening bolts; fix the bending pressure head 305 to the pressure sensor 304 by fastening bolts; connect the signal transceiver end of the data acquisition circuit to the signal transceiver end of the control unit; connect the signal output end of the input unit to the signal input end of the control unit; connect the signal output end of the control unit to the signal input end of the output unit;

[0111] S2: Prepare the test piece, select the electromagnetic wire with polyimide film layer, analyze the manufacturing process of the expansion machine, calculate the size of the test piece using the equivalent principle, and process the electromagnetic wire as the test piece;

[0112] S3: Clamp the specimen. Clamp the specimen at the tensile end. First, clamp the specimen in the fixed end fixture. Adjust the feed amount of the lead screw accurately through the operation interface so that the distance between the two fixtures at the tensile end can meet the coil length. Then tighten the tightening handle of the tensile fixture to fix and clamp the specimen. At the torsion end, move the fixed end fixture to adjust to the appropriate length of the specimen, and tighten the torsion fixture tightening bolt;

[0113] S4: expansion test, inputting control parameters into the control unit through the input unit, and the control unit sends the control parameters to each component in the device through the signal processing unit;

[0114] S5: Data analysis and processing. The system outputs the tensile force F1 at the stretching end, the thrust F2 at the bending end, the tensile displacement D1, the bending deflection D2, the torque T, the torque loading time t1, the torque holding time t2, the thrust loading time t3, the thrust holding time t4, the rotation angle θ and other data. The user analyzes the data.

[0115] S41: Tensile test, the specific steps are:

[0116] S411: Adjust the stretching end assembly, and adjust the ball screw feed amount by jogging the servo motor in manual mode, so that the distance between the two clamps at the stretching end can approximately meet the coil length, and mark the ball screw scale. The distance between the ball screw limit end and the fixed end is used as the initial length L0 of the coil, and the ball screw moves from the limit end to the motor end to perform the stretching movement;

[0117] S412: Clamp the specimen. First, clamp the specimen in the fixture at the fixed end of the tensile component. Calculate the motor rotation angle through the lead screw lead and accurately control the screw feed amount on the upper computer operation interface so that the distance between the two fixtures at the tensile end can meet the coil length. Then tighten the tightening handle of the tensile fixture to fix and clamp the specimen. During this process, ensure that the specimen material is parallel to the plane of the special test bench; S413: Install the extensometer. Install the extensometer on the specimen at about the middle. The extensometer marking distance is L e , mark the original gauge length L with a thin line e ;

[0118] S414: Set the zero point of the test force. After the test loading chain is assembled and before the two ends of the specimen are clamped, the zero point of the force measurement system should be set; S415: Specimen clamping. Use the tensile end clamp to clamp the specimen to ensure that the clamped specimen is subjected to axial tension and reduce bending. In order to obtain a straight specimen and ensure that the specimen is horizontally aligned with the clamp, a pre-tension corresponding to no more than 5% of the specified strength can be applied;

[0119] S416: Conduct the test, control the motor drive to perform the stretching action through the host computer, load slowly and evenly, obtain the yield load value, record it to calculate the yield point stress value, pay attention to observe the slip phenomenon in the yield stage, after the yield stage, the loading speed can be accelerated;

[0120] S417: Tensile test and data acquisition. The servo motor drive is controlled through the host computer operation interface. The actuator generates axial tension to deform the specimen. The displacement is measured by the grating ruler through the software interface. The tension F1, displacement D1, loading time t1, holding time t2, and coil length L are calculated. c As control variables, two of the control variables are set, and the displacement is set as the monitoring response. When the specimen is stretched to the set displacement, the motor is controlled to stop rotating and brake, load is maintained, and the stretching displacement S1 is observed; S418: data analysis and processing, the system outputs tension F1, displacement S1, loading time t1, load holding time t2, coil length L c Users analyze the data.

[0121] S42: Torsion test, e.g. Fig.13 , the specific steps are:

[0122] S421: Adjust the torsion end fixture, loosen the fastening screws under the torsion end fixing fixture, and adjust the distance between the two fixtures through the sliding guide rail to be larger than the initial length L of the specimen. c. S422: Install the specimen, embed the specimen into the action end torsion fixture parallel to the table surface, make its axis coincide with the center axis of the chuck, ensure that the specimen remains straight during the test, and turn the handle to tighten; then adjust the distance of the slide rail to meet the coil length requirements, embed the other end of the specimen into the fixed end fixture, and then tighten the fixed end mounting screws, tighten the fixed end fixture handle to clamp the specimen; after placing the specimen into the chuck of the testing machine, rotate the rotatable chuck at a suitable constant speed until the specimen reaches the specified torsion angle α;

[0123] S423: Start the motor and control the output torque and angle control range through the host computer operation interface;

[0124] S424: Torsion data acquisition; control the motor drive through the host computer operation interface; the actuator generates a rotational motion to cause the specimen to twist and deform, and the torque and rotation angle thresholds are monitored through the software interface; the torque T, loading time t1, holding time t2, rotation angle θ, coil length L c as control variables; set two of the control variables; set the torque and angle as monitoring responses, when the specimen is twisted to the preset angle α, control the motor to stop working until the brake is engaged, maintain the load, change the control time, and observe the torsion value; at this time, the specimen is twisted to a certain extent, after maintaining the load, perform torque unloading, control the motor to rotate in the opposite direction, observe the change in torque value, and stop the motor when the torque value is 0; after unloading, read the change angle β; S425: data analysis and processing, torque T, loading time t1, load holding time t2, rotation angle θ.

[0125] S43: Bend test, e.g. Fig.16 The specific steps are as follows: S431: adjust the fixture, fix the specimen through the stretching end, and adjust the ball screw feed amount through the servo motor manual mode so that the distance between the two fixtures at the stretching end can approximately meet the coil length, and the distance between the ball screw limit end and the fixed end is used as the initial length L0 of the coil length; S432: install the specimen, embed the multi-layer surface of the specimen into the stretching fixture at the actuating end perpendicular to the table, turn the handle to tighten the chuck, adjust the distance of the stretching actuating end to meet the coil length requirement, and embed the other section of the specimen into the fixed end fixture, tighten the fixed end fixture handle to clamp the specimen;

[0126] S423: The specimen is subjected to bending moment during the bending process, and the thrust generated at the bending end is constant and does not rotate; by adjusting the distance between the convex tops on the bending fixture or the number of installations, force is applied at one or two points of the specimen to perform three-point bending or four-point bending; S434: Mark the initial gauge length S0 of the coil, and control the electric cylinder drive through the upper computer operation interface;

[0127] S435: Adjust the bending end fixture, manually adjust the distance between the two acting pressure heads on the four-point bending special fixture, and then align the pressure head with the marking point by adjusting the position of the electric cylinder bracket;

[0128] S436: Bending test data collection, start the motor, control the electric cylinder drive through the host computer operation interface, the actuating end generates radial displacement to cause the specimen to bend; monitor the displacement measured by the grating ruler through the software interface, and convert the thrust F2, bending deflection D2, loading time t1, holding time t2, coil length L c As control variables, set two of the control variables and set the displacement as the monitoring response; when the specimen bends to the specified displacement, control the motor to stop rotating and brake, maintain the load, change the control time, and observe the bending deflection D2; S437: data analysis and processing, the system outputs thrust F2, bending deflection D2, loading time t1, holding time t2, coil length L c And other data information, analyze the data.

[0129] S44: Tensile-bending test, e.g. Figure 17-18 As shown, the specimen is subjected to bending moment during the stretching process. The tensile-bending test has load timing, and the test conditions include: stretching first and then bending, bending first and then stretching, and stretching and bending at the same time;

[0130] See also Fig.17 and Fig.18 During the stretching-bending process, the side of the specimen 700 is clamped by two wedges 1091 of the stretching movable end clamp 109 and the stretching fixed end clamp 112. The wedges 1091 are rotated and pushed to lock by two force arms. The rectangular block 1092 is tightened on the specimen 700 by screws to prevent the end of the specimen 700 from warping up during the bending process.

[0131] S441: The working condition of stretching first and then bending includes the following steps: starting the test, the process of clamping the specimen and the method of applying the load are the same as those in the tensile test; the loading process and method are the same as those in the bending test, the tensile displacement and the bending deflection are set as monitoring responses, the stretching action is performed first, when the specimen reaches the specified displacement, the motor is controlled to stop working and brake, the load is maintained, and the stretching displacement D1 is observed; then the bending action is performed, when the specimen is bent to the specified displacement, the motor is controlled to stop working and brake, the load is maintained, and the bending deflection D2 is observed; the loading sequence is determined by the actual working conditions.

[0132] S442: The working condition of bending first and stretching later includes the following steps: setting the stretching displacement and bending deflection as monitoring responses, performing bending action first, and when the specimen bends to the specified displacement, controlling the motor to stop working and brake to maintain the load, and observing the bending deflection amount D2; then performing stretching action, and when the specimen is stretched to the specified displacement, controlling the motor to stop working and brake to maintain the load, and observing the stretching displacement D1; the loading sequence is determined by the actual working conditions.

[0133] S443: Simultaneous stretching and bending conditions, including the following steps:

[0134] The bending-then-stretching working condition includes the following steps: the upper computer interface sets the corresponding loading rate and load for stretching-bending, and the loading time is kept consistent, so that the fixture applies the load to the time at the same time. The stretching displacement and bending deflection are set as monitoring responses, and the stretching and bending actions are performed simultaneously. When the specimen is bent to the specified displacement, the motor is controlled to stop working until the brake is engaged, and the load is maintained, and the bending deflection D2 is observed; when the specimen is stretched to the specified displacement, the motor is controlled to stop working until the brake is engaged, and the load is maintained, and the stretching displacement D1 is observed; S444: data analysis and processing, data variables tension F1, stretching displacement D1, loading time t1, load-holding time t2, coil length L c , thrust F2, bending deflection D2 and other data, and users analyze the data.

[0135] S45: Torsion-bending test, e.g. Fig.19 As shown in the figure, the schematic diagram of the torsion-bending condition before loading (a) and the schematic diagram of the torsion-bending condition after loading (b), in which the specimen is subjected to bending moment during the torsion process. The torsion-bending test has load timing, and the test conditions include: torsion first and then bending, bending first and then torsion, and torsion and bending at the same time. The specimen is subjected to bending moment during the torsion process, and the thrust generated at the bending end is constant and does not rotate; by adjusting the distance of the convex tops on the bending fixture or the number of installations, force is applied at one or two points of the specimen to perform three-point bending or four-point bending.

[0136] During the torsion-bending test, the following Fig.19 The structure shown in (c) is used as a clamp 3001 at both ends of the specimen during bending pressure or torsion. The specimen is tightened relatively from two directions by screws in the vertical and horizontal directions on the clamp 3001 (the movable clamp block is clamped by the screws in the vertical direction, and a protective layer can be provided on the screw head to protect the specimen). The clamp 3001 locks the straight edge of the specimen, and the bending pressure head 305 bends the specimen to form a straight edge. The straight edge extends downward from the opening at the bottom of the clamp 3001 to the pressing position of the bending loading head. When the torsion end rotates, the specimen is warped to form a transition edge structure, which avoids the phenomenon of twisting and twisting during torsion. The order of torsion and bending can be adjusted, and the clamp 3001 can be used for both.

[0137] S451: The working condition of twisting first and then bending includes the following steps: during the test process, the process of clamping the specimen and the method of applying the load are the same in the tensile test of the specimen; the loading process and method are the same in the bending test of the specimen, and the torsion angle and the bending deflection are set as monitoring responses. When the specimen is twisted to a preset angle α, the motor is controlled to stop working until the brake is engaged, the load is maintained, the control time is changed, and the torsion value is observed; the bending end feeding operation is performed; when the specimen is bent to a specified displacement, the motor is controlled to stop working until the brake is engaged, the load is maintained, the control time is changed, and the bending deflection amount D2 is observed.

[0138] S452: The bending-before-torsion working condition includes the following steps: During the test process, the clamping process of the specimen in the tensile test is the same as the load application method; the loading process and method of the specimen in the bending test are the same, and the torsion angle and bending deflection are set as monitoring responses. First, the bending action is performed. When the specimen is bent to the specified displacement, the motor is controlled to stop working until the brake is engaged, the load is maintained, the control time is changed, and the bending deflection D2 is observed; then the torsion action is performed. When the specimen is twisted to the preset angle α, the motor is controlled to stop working until the brake is engaged, the load is maintained, the control time is changed, and the torque value is observed.

[0139] S453: Simultaneous torsion and bending conditions: The upper computer interface sets the corresponding loading rate and load for torsion-bending, and the loading time is kept consistent so that the fixture applies the load to the time at the same time. Perform torsion-bending actions simultaneously. When the specimen is bent to the specified displacement, the motor is controlled to stop working until the brake is engaged, the load is maintained, the control time is changed, and the bending deflection D2 is observed; when the specimen is twisted to the preset angle α, the motor is controlled to stop working until the brake is engaged, the load is maintained, the control time is changed, and the torque value is observed. S454: Data analysis and processing. The data variables include torque T, bending thrust F2, bending deflection D2, loading time t1, load-holding time t2, rotation angle θ, coil length L c Users analyze the data.

[0140] S461: Torsion first and then stretching working condition, including the following steps: During the test process, the overall torsion assembly includes the servo motor 201, the second servo motor fixing seat 202, the angle torque sensor bracket 206, and the torsion end chuck bracket 207. The angle torque sensor 205, the torsion chuck support seat 208, etc. are bolted on the T-slot, and the whole is swapped and installed and fixed in the T-slot of the stretching end to form a stretching-torsion composite working condition. The process of clamping the specimen in the tensile and torsion tests is the same as the load application method; the loading process and method of the specimen in the tensile test are the same. When the specimen is twisted to the preset angle γ, the motor is controlled to stop to maintain the load, change the control time, and observe the torsion value; when the tensile end feed operation is performed; when the specimen is bent to the specified displacement, the motor is controlled to stop working to the brake, maintain the load, change the control time, and observe the stretching displacement D3.

[0141] S462: The working condition of stretching first and then twisting is the same as that of twisting first and then bending. The loading sequence is stretching first and then bending. There is a time sequence between the two working conditions.

[0142] S463: Simultaneous stretching and bending condition. The operation steps are the same as the torsion-first-then-bending condition. The loading sequence is to perform torsion and bending simultaneously. S464: Data analysis and processing. The data variables include torque T3, tensile force F3, tensile displacement D3, loading time t1, holding time t2, rotation angle γ and other data. The data are analyzed.

[0143] Example 2

[0144] See also Fig. 20 , which is a combined working condition of tension and torsion. The tests can be performed simultaneously or in a sequential order. During the test, the specimen clamping method is that one end of the specimen 700 is fixed by the tension moving end chuck 109, and the other end is fixed by the torsion action end chuck 209.

[0145] Example 3

[0146] See also Fig.21 The shuttle coil 500 with rectangular rounded corners has an original straight edge 502 and an original rectangular rounded corner 501, and is stretched as a whole to form a straight portion 802 and a nose portion 801, and the length increases from Sa to Sb, through Fig.10 The structure of the device of the embodiment is integrated into a formed coil 800 through torsion, stretching and bending.

[0147] When performing the three comprehensive tests of tension, torsion and bending, different performance parameters are obtained by changing the test order to compare the impact of different tests, which will not be repeated here.

[0148] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application claimed for protection, but only represents selected embodiments of the present application.

Claims

1. A permanent magnet traction motor stator forming coil expansion test device, characterized in that include: At least one tension and compression assembly is fixed on the base platform in a manner that the arrangement position can be adjusted movably to assist in forming the transition edge; At least one torsion assembly is arranged one by one in the tensile or compressive direction of the tension and compression assembly, and can slide and move along the base platform to adjust the relative position with the tension and compression assembly to form a transition fillet and a nose end; At least one bending assembly, including a bending head capable of linear movement in a direction perpendicular to a line connecting two end points of the specimen, wherein the projection position of the bending head on the base platform can be adjusted so as to be combined with at least one of a tension-compression assembly and a torsion assembly in a four-point or three-point pressurization manner to form a straight edge and a transition edge; The three components are provided with load sensors, displacement sensors, torque sensors and angle sensors to obtain the load, displacement and deformation parameters of the formed coil specimen during the above processing; All three components use servo motors connected to planetary reducers to form power output modules; In the tension and compression assembly, the power output module is connected to the guide rail slider module; the guide rail slider module includes a lead screw slider, a guide rail, a fixed end chuck, and a movable end chuck arranged in a straight line with the fixed end chuck, wherein the movable end chuck is constrained on the guide rail by a slider and can slide linearly along the guide rail; a grating scale displacement sensor is arranged along the guide rail in the tension and compression assembly, wherein the two ends of the scale grating are respectively fixed to the two ends of the guide rail, and the indicating grating is installed on the movable end chuck for moving with the specimen to measure the elongation; the first tension and compression sensor is installed on the movable end chuck for moving with the specimen to measure the tensile force during stretching; In the torsion assembly, on the rear extension line of the power output module, the torsion action end chuck and the torsion fixed end chuck are arranged in a straight line and spaced apart, the power output module is connected to the torsion action end chuck, and a torsion chuck return zero limit structure is arranged at the torsion fixed end chuck to limit the radial range of motion of the torsion chuck; the angle and torque sensor is arranged between the output end of the planetary reducer of the power output module and the torsion action end chuck; The bending head of the bending assembly is arranged vertically or horizontally, and the output end of the power output module is connected to the physical center of the balance plate arranged perpendicular to the extension direction. Two rib-shaped convex tops are axially symmetrically arranged on the lower surface of the balance plate with the physical center of the balance plate as the midpoint, or a rib-shaped convex top is arranged in the center. The convex top is arranged along the direction of pressure expansion or pulling extension, and the outer edge of the lowest part maintains a thickness suitable for contact with the coil and pressure.

2. The permanent magnet traction motor stator forming coil expansion test device according to claim 1 is characterized in that All three components can work independently, and the torsion component and the bending component are configured to be able to be simultaneously combined into the working space of the tension and compression component in a manner in which at least one component participates, so as to perform coil expansion processing tests on the formed coil specimens according to different processing sequences.

3. The permanent magnet traction motor stator forming coil expansion test device according to claim 1 is characterized in that A number of parallel spaced slide grooves are arranged on the basic platform. Both the tension and compression components and the torsion components are fixed by T-slot fixings. The bottom of the T-slot fixings has a foot sliding block that can move along the slide groove. The tension and compression components and the torsion components are arranged to be combined and position adjusted by the T-slot spacing.

4. The permanent magnet traction motor stator forming coil expansion test device according to claim 1 is characterized in that The clamps of the tension and compression assembly and the torsion assembly include various forms, including clamps for clamping straight edges, and clamps having grooves for accommodating the initial folded state of the coil and the nose end.

5. The permanent magnet traction motor stator forming coil expansion test device according to claim 1 is characterized in that The torsion action end chuck and the moving end chuck are both movably and detachably fixed on the basic platform by T-slot fixing parts.

6. A method for testing expansion, characterized in that The permanent magnet traction motor stator forming coil expansion test device according to any one of claims 1 to 5 is used to collect load, displacement, and deformation parameters during the expansion test of the specimen and combine the coil deformation as analyzable test results, and the expansion test method includes at least the following: A separate tensile test, a separate torsion test, a separate bending test, and: Tensile-bending test: The specimen is subjected to bending moment during the stretching process. According to the load timing, the tensile-bending test conditions are divided into: stretching first and then bending, bending first and then stretching, and stretching and bending at the same time; Torsion-bending test: The specimen is subjected to bending moment during torsion. According to the load sequence, the torsion-bending test conditions include: twisting first and then bending, bending first and then twisting, and twisting and bending at the same time. The specimen is subjected to bending moment during torsion. The thrust generated by the bending head is constant and does not rotate. By adjusting the number or distance of convex tops on the bending head, one or two points of force are applied on the specimen to perform three-point bending or four-point bending tests. Tensile-torsion test: The specimen is subjected to torque during the stretching process. The tensile-torsion test conditions are divided into: stretching first and then torsion, torsion first and then stretching, and simultaneous stretching and torsion.

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