Drive control test bed for single wheel set system arranged in permanent magnet direct drive axle box

Abstract

The invention discloses a permanent magnet direct drive axle box built-in single wheel set system drive control test bench. The test bench comprises a mechanical system and a control system. The mechanical system comprises a rack and actuating device, a wheel-rail relation simulation device, a tested single wheel set system, an auxiliary restraint device and a load torque simulation device; the control system is used for controlling the vertical load and the load torque applied to the tested single wheel set system by the mechanical system and controlling the driving of the tested single wheel set system; the boundary of the permanent magnet motor is considered more perfectly by the auxiliary constraint device, and the simulation of the elastic constraint boundary of the motor is realized; the rack and the actuating device apply a vertical load to a tested single wheel set system, and simulation of a wheel-rail load is realized in combination with the wheel-rail relationship simulation device; the load torque simulation device can simulate traction motor load torque caused by train operation resistance. The permanent magnet direct drive axle box built-in single wheel set system drive control test bench can provide support for motor control algorithm optimization design of a permanent magnet direct drive built-in bogie.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet direct-driven built-in bogie test equipment, and in particular to a permanent magnet direct-driven axle box built-in single wheelset system drive control test bench. Background Art

[0002] Compact transmission drive is an important development direction of bogie drive technology, which provides the possibility for further lightweighting of bogies. Permanent magnet direct drive axle box built-in bogie is a typical representative. Compared with traditional bogies, it shortens the lateral span and longitudinal wheelbase, which can further achieve lightweighting of bogies. It has become a research hotspot in recent years. For example, the existing invention patent-CN115257825A discloses a rail vehicle bogie and its drive unit. The full-speed control of the permanent magnet direct drive built-in bogie is a problem that must be studied for the engineering application of this type of bogie. Therefore, it is very necessary to establish a corresponding motor drive control test bench.

[0003] In the existing technology, the traditional motor drive control test bench is often in the form of a simple towing test bench, that is, the load motor is directly connected to the motor under test through the corresponding mechanical system. For example, the existing invention patent - CN118962435A discloses a dual-motor towing test device and method, but this type of test device cannot truly simulate the service limit of the drive motor, especially ignoring the impact of wheel-rail interaction on the entire permanent magnet direct drive transmission system, which is not conducive to the development of motor control algorithms.

[0004] In the prior art, although there are many test benches for single wheel set systems, such as the existing invention patent CN111157263A discloses a wheel set test bench for railway vehicles, and CN111006888A discloses a train air brake anti-skid device performance test method and test bench, these test benches are often not directly used for motor control tests for the following reasons: First, the wheelsets under test in these test benches are not actively driven, but the wheelsets are rotated by the rollers under the drive bench; Second, these test benches cannot simulate the load torque on the traction motor caused by running resistance; Third, these test benches are not standardized for permanent magnet direct-drive axlebox built-in wheelsets. Summary of the invention

[0005] In view of the above-mentioned problems in the prior art, the present invention provides a drive control test bench for a permanent magnet direct-drive axle box with a single wheelset system built in, and studies the drive control of the permanent magnet direct-drive axle box with a single wheelset system built in under full-speed conditions, thereby providing support for the optimization design of the motor control algorithm of the permanent magnet direct-drive built-in bogie, and solving the problem that the existing motor drive control test bench cannot directly perform drive motor control tests on the permanent magnet direct-drive axle box with a single wheelset system built in.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows: A drive control test bench for a single wheelset system with a permanent magnet direct-drive axle box is provided, which comprises a mechanical system and a control system; the mechanical system comprises a frame and an actuating device, a wheel-rail relationship simulation device, a single wheelset system to be tested, an auxiliary restraint device and a load torque simulation device; The single wheelset system under test is arranged on the wheel-rail relationship simulation device, the auxiliary restraint device is used to fix the single wheelset system under test, the frame and the actuating device apply a vertical load to the single wheelset system under test, and the load moment simulation device applies a load torque to the single wheelset system under test; The control system is used to control the magnitude of the vertical load and load torque applied by the mechanical system to the single wheelset system under test, and to control the driving of the single wheelset system under test.

[0007] Furthermore, the frame and the actuating device include a base, a gantry is provided on the upper end surface of the base, two hydraulic actuators are provided on the gantry, the tail ends of the two hydraulic actuators are fixedly connected to the gantry crossbeam, and the output ends of the two hydraulic actuators are used to connect to the auxiliary restraint device.

[0008] Furthermore, the wheel-rail relationship simulation device includes a support seat arranged on the upper end surface of the base, two roller axle boxes are horizontally spaced apart on the upper end surface of the support seat, and a roller assembly is rotatably arranged between the two roller axle boxes; the single wheelset system to be tested is arranged on the top of the roller assembly and in contact with it.

[0009] Furthermore, the roller assembly includes a rotating shaft and two rollers fixedly arranged at both ends of the rotating shaft, and both ends of the rotating shaft are rotatably connected to the two roller axle boxes through rolling bearings respectively; the treads of the two rollers are arranged as a circumferentially uneven structure to realize the simulation of wheel-rail dynamic excitation; the single wheelset system under test is in contact with the treads of the two rollers.

[0010] Further, the single wheelset system under test includes a permanent magnet motor, a transmission hollow shaft is mounted inside the permanent magnet motor, the rotor output end of the permanent magnet motor drives the transmission hollow shaft to rotate around its own axis through a coupling, and the other end of the transmission hollow shaft is connected to the axle through a coupling; two wheels are arranged on both sides of the axle; the treads of the two wheels are in contact with the treads of the two rollers respectively; a wheelset axle box is arranged on the inner side of the two wheels, each wheelset axle box is rotatably matched with the axle through a double-row tapered roller bearing, and a first-series rubber pile and a first-series steel spring are arranged on the top of each wheelset axle box; the output ends of the two hydraulic actuators of the first-series steel spring and the first-series steel spring respectively apply vertical loads to the top ends of the two first-series steel springs; The auxiliary restraint device is arranged behind the permanent magnet motor, and a connecting piece for cooperating with the auxiliary restraint device is arranged on the rear end surface of the permanent magnet motor.

[0011] Furthermore, the auxiliary restraint device comprises two auxiliary columns arranged behind the permanent magnet motor, an auxiliary crossbeam is arranged between the tops of the two auxiliary columns, and the bottoms of the two auxiliary columns are fixedly connected to the upper end surface of the base; A steel spring axle box restraint device is provided at both ends of the front side of the auxiliary crossbeam; a motor restraint device cooperating with the connecting piece is provided between the two steel spring axle box restraint devices; Each steel spring axle box restraint device includes a first restraint seat fixedly connected to the front side of the auxiliary crossbeam, the top of the restraint seat is provided with a guide groove, and the bottom is provided with a connecting ear with a hole; a dummy frame is slidably arranged in the guide groove, one end of the dummy frame is slidably connected to the guide groove, and the lower end face of the other end is provided with a lower end face cap barrel, the upper end face of the dummy frame and the lower end face cap barrel are respectively in contact with the output end of the hydraulic actuator and the top end of the first series steel spring; the connecting ear with a hole is connected to the swing arm positioning hole of the wheelset axle box through a positioning pin shaft.

[0012] Furthermore, the connecting member includes two first hanging seats and one second hanging seat arranged on the rear end surface of the permanent magnet motor; the two first hanging seats are arranged horizontally at intervals and each of them is provided with a hanging hole; the second hanging seat is located in the middle below the two first hanging seats; The motor restraint device comprises a second restraint seat fixedly connected to the front side of the auxiliary crossbeam, two motor hangers are arranged horizontally at intervals on the second restraint seat, and each of the motor hangers is provided with an elastic rubber node; the two motor hangers are respectively connected to the two first hangers by means of the elastic rubber nodes cooperating with the hanging holes; A motor tie rod seat is arranged at the middle position below the two motor hangers. The motor tie rod seat is connected to a motor tie rod through an elastic rubber node, and the other end of the motor tie rod is connected to the second hanger through an elastic rubber node.

[0013] Furthermore, each of the load torque simulation devices includes a support arranged on one side of the single wheelset system under test, the bottom of the support is fixedly connected to the upper end surface of the support seat, and a magnetic powder brake is arranged on the top of the support, and the output end of the magnetic powder brake is fixedly connected to one end of the transmission hollow shaft through a coupling.

[0014] Furthermore, the control system includes a controller and a frequency converter, a power amplifier and a hydraulic control valve electrically connected to the controller; the frequency converter, the power amplifier and the hydraulic control valve respectively control the permanent magnet motor, the magnetic powder brake and the hydraulic actuator. Specifically, the controller usually adopts an industrial computer to send corresponding control signals to the frequency converter, the power amplifier and the hydraulic control valve. Among them, the frequency converter is connected to the permanent magnet motor through a circuit to drive the permanent magnet motor to generate torque and realize drive simulation; the power amplifier is connected to the magnetic powder brake through a circuit to drive the magnetic powder brake to generate torque and realize running resistance simulation; the hydraulic control valve is connected to the hydraulic actuator through an oil circuit to drive the hydraulic actuator to generate force load and realize suspension load simulation.

[0015] Compared with the existing motor drive control test bench of towing type, the beneficial effects of the present invention are: 1. The permanent magnet direct-drive axle box in the present invention is equipped with a single wheelset system drive control test bench. When the auxiliary restraint device fixes the single wheelset system under test, the boundary of the permanent magnet motor is more completely considered, thereby realizing the simulation of the elastic restraint boundary of the motor. The hydraulic actuator applies a vertical load to the single wheelset system under test, and at the same time, the tread of the roller is set as a circumferentially uneven structure. The single wheelset system under test is in contact with the treads of two rollers, thereby realizing the simulation of the wheel-rail load.

[0016] 2. The drive control test bench of the permanent magnet direct-drive axle box built-in single wheelset system in the present invention is designed based on the structure of the permanent magnet direct-drive built-in bogie, and the tested structure of the permanent magnet direct-drive axle box built-in wheelset system can be realized to carry out the drive control test research of the permanent magnet direct-drive axle box built-in wheelset system, and provide support for the optimization design of the motor control algorithm of the permanent magnet direct-drive built-in bogie. The load torque simulation device can simulate the load torque of the traction motor caused by the running resistance of the train, which solves the problem that the existing test bench cannot simulate the load torque of the traction motor caused by the running resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a three-dimensional structural schematic diagram of a drive control test bench for a single wheelset system with a permanent magnet direct-drive axle box built in.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the frame and the actuator.

[0019] Figure 3 Schematic diagram of the three-dimensional structure of the wheel-rail relationship simulation device.

[0020] Figure 4 Schematic diagram of the three-dimensional structure of the single wheelset system under test.

[0021] Figure 5 This is a schematic diagram of the internal cross-sectional structure of a permanent magnet direct-drive hollow shaft transmission system.

[0022] Figure 6 Schematic diagram of the three-dimensional structure of the auxiliary restraint device.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of a single steel spring axle box restraint device.

[0024] Figure 8 Schematic diagram of the three-dimensional structure of a single pseudo-frame.

[0025] Fig. 9 Schematic diagram of the three-dimensional structure of the motor restraint device.

[0026] Fig.10 Schematic diagram of the three-dimensional structure of the load moment simulation device.

[0027] Fig.11 This is the principle block diagram of the control system.

[0028] Among them, 1. frame and actuator; 11. base; 12. gantry; 13. hydraulic actuator; 2. wheel-rail relationship simulation device; 21. support seat; 22. roller axle box; 23. rotating shaft; 24. roller; 3. single wheelset system under test; 31. permanent magnet motor; 32. axle; 33. wheel; 34. wheelset axle box; 341. swing arm positioning hole; 35. first series rubber pad; 36. first series steel spring; 37. coupling; 38. first suspension seat; 39. second suspension seat, 4 0. Transmission hollow shaft; 4. Auxiliary restraint device; 41. Auxiliary column; 42. Auxiliary crossbeam; 43. Steel spring axle box restraint device; 431. First restraint seat; 432. Guide groove; 433. Connecting ear with hole; 434. Dummy frame; 4341. Cap tube; 44. Motor restraint device; 441. Second restraint seat; 442. Motor hanger; 443. Motor pull rod seat; 444. Motor pull rod; 5. Load torque simulation device; 51. Support; 52. Magnetic powder brake. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0030] like Figure 1 and Fig.11 As shown, the present invention provides a permanent magnet direct-drive axle box built-in single wheelset system drive control test bench, which includes a mechanical system and a control system; the mechanical system includes a frame and an actuating device 1, a wheel-rail relationship simulation device 2, a single wheelset system to be tested 3, an auxiliary restraint device 4 and a load torque simulation device 5.

[0031] The single wheelset system 3 under test is arranged on the wheel-rail relationship simulation device 2, the wheel-rail relationship simulation device 2, the auxiliary restraint device 4 is used to fix the single wheelset system 3 under test, the frame and actuating device 1 applies a vertical load to the single wheelset system 3 under test, and the load torque simulation device 5 applies a load torque to the single wheelset system 3 under test.

[0032] The control system is used to control the magnitude of the vertical load and load torque applied by the mechanical system to the single wheelset system 3 under test, and to control the driving of the single wheelset system under test.

[0033] Specifically, Figure 1 and Figure 2 As shown, the frame and actuating device 1 includes a base 11, and a gantry 12 is provided on the upper end surface of the base 11. Two hydraulic actuators 13 are provided on the gantry 12, and the tail ends of the two hydraulic actuators 13 are fixedly connected to the cross beam of the gantry 12, and the output ends of the two hydraulic actuators 13 are used to connect with the auxiliary restraint device 4.

[0034] like Figure 1~Figure 3 As shown, the wheel-rail relationship simulation device 2 includes a support seat 21 arranged on the upper end surface of the base 11, and two roller axle boxes 22 are horizontally spaced apart on the upper end surface of the support seat 21, and a roller assembly is rotatably arranged between the two roller axle boxes 22; the single wheelset system 3 to be tested is arranged on the top of the roller assembly and in contact with it.

[0035] The roller assembly includes a rotating shaft 23 and two rollers 24 fixedly arranged at both ends of the rotating shaft 23, and both ends of the rotating shaft 23 are rotatably connected to the two roller axle boxes 22 through rolling bearings; the treads of the two rollers 24 are set as a circumferential uneven structure to realize the simulation of wheel-rail dynamic excitation; the single wheelset system 3 under test is in contact with the treads of the two rollers 24.

[0036] like Figure 4 and Figure 5 As shown, the single wheelset system 3 under test includes a permanent magnet motor 31, a transmission hollow shaft 40 is mounted inside the permanent magnet motor 31, and the rotor output end of the permanent magnet motor 31 drives the transmission hollow shaft 40 to rotate around its own axis through a coupling 37, and the other end of the transmission hollow shaft 40 is connected to the axle 32 through the coupling 37. Two wheels 33 are arranged on both sides of the axle 32, and the treads of the two wheels 33 are in contact with the treads of the two rollers 24 respectively; the two wheelset axle boxes 34 are located inside the two wheels 33. On the side, each wheelset axle box 34 is rotatably matched with the axle 32 through a double-row tapered roller bearing, and a primary rubber pile 35 and a primary steel spring 36 are provided on the top of each wheelset axle box 34; the primary rubber pile 35 is vulcanized on the axle box 34, and the primary steel spring 36 is seated on the primary rubber pile 35, and the primary rubber pile 35 is connected to the 434 dummy frame through a cap tube 4341; the output ends of the two hydraulic actuators 13 apply vertical loads to the top ends of the two primary steel springs 36 through the dummy frame 434 respectively.

[0037] The auxiliary restraint device 4 is arranged behind the permanent magnet motor 31 , and a connecting piece for cooperating with the auxiliary restraint device 4 is arranged on the rear end surface of the permanent magnet motor 31 .

[0038] Preferably, but not limited to, Figure 4~Figure 9 As shown, the auxiliary restraint device 4 includes two auxiliary columns 41 arranged behind the permanent magnet motor 31, an auxiliary crossbeam 42 is arranged between the tops of the two auxiliary columns 41, and the bottoms of the two auxiliary columns 41 are fixedly connected to the upper end surface of the base 11.

[0039] A steel spring axle box restraint device 43 is disposed at both ends of the front side of the auxiliary cross beam 42; and a motor restraint device 44 cooperating with the connecting piece is disposed between the two steel spring axle box restraint devices 43.

[0040] Each steel spring axle box restraint device 43 includes a first restraint seat 431 fixedly connected to the front side of the auxiliary cross beam 42, a guide groove 432 is arranged on the top of the restraint seat, and a connecting ear 433 with a hole is arranged on the bottom; a dummy frame 434 is slidably arranged in the guide groove 432, one end of the dummy frame 434 is slidably connected to the guide groove 432, and the upper end surface and the lower end cap tube 4341 of the other end are respectively in contact with the output end of the hydraulic actuator 13 and the top end of the first-stage steel spring 36; the connecting ear 433 with a hole is connected to the swing arm positioning hole 341 of the wheel axle box 34 through a positioning pin.

[0041] Furthermore, the connecting member includes two first hangers 38 and one second hanger 39 arranged on the rear end surface of the permanent magnet motor 31; the two first hangers 38 are arranged horizontally at intervals and each has a hanger hole; the second hanger 39 is located in the middle below the two first hangers 38.

[0042] The motor restraint device 44 includes a second restraint seat 441 fixedly connected to the front side of the auxiliary crossbeam 42, and two motor hangers 442 are horizontally spaced apart on the second restraint seat 441, and each of the motor hangers 442 is provided with an elastic rubber node; the two motor hangers 442 are respectively connected to the two first hangers 38 by means of elastic rubber nodes and hanging holes.

[0043] A motor tie rod seat 443 is provided in the middle position below the two motor hangers 442 . The motor tie rod seat 443 is connected to a motor tie rod 444 via an elastic rubber node. The other end of the motor tie rod 444 is connected to the second hanger 39 via an elastic rubber node.

[0044] like Fig.10 As shown, each of the load torque simulation devices 5 includes a support 51 arranged on one side of the single wheelset system 3 under test, the bottom of the support 51 is fixedly connected to the upper end surface of the support seat 21, and a magnetic powder brake 52 is arranged on the top of the support 51, and the output end of the magnetic powder brake 52 is fixedly connected to one end of the axle 32 through a coupling.

[0045] like Fig.11 As shown, the control system includes a controller and a frequency converter, a power amplifier and a hydraulic control valve electrically connected to the controller; the frequency converter, the power amplifier and the hydraulic control valve respectively control the permanent magnet motor 31, the magnetic powder brake 52 and the hydraulic actuator 13. Specifically, the controller usually adopts an industrial computer to send corresponding control signals to the frequency converter, the power amplifier and the hydraulic control valve. Among them, the frequency converter is connected to the permanent magnet motor 31 through a circuit to drive the permanent magnet motor 31 to generate torque and realize drive simulation; the power amplifier is connected to the magnetic powder brake 52 through a circuit to drive the magnetic powder brake 52 to generate torque and realize running resistance simulation; the hydraulic control valve is connected to the hydraulic actuator 13 through an oil circuit to drive the hydraulic actuator 13 to generate force load and realize suspension load simulation.

[0046] In summary, the drive control test bench of the permanent magnet direct-drive axle box built-in single wheel pair system in the present invention is designed according to the structure of the permanent magnet direct-drive built-in bogie, and the test structure of the permanent magnet direct-drive axle box built-in wheel pair system is designed, which can realize the drive control test research of the permanent magnet direct-drive axle box built-in wheel pair system, and provide support for the optimization design of the motor control algorithm of the permanent magnet direct-drive built-in bogie. When the auxiliary constraint device 4 fixes the single wheel pair system 3 under test, the boundary consideration of the permanent magnet motor 31 is more perfect, and the simulation of the elastic constraint boundary of the motor is realized; the hydraulic actuator 13 can apply a vertical load to the single wheel pair system 3 under test, and at the same time, the tread of the roller 24 is set as a circumferential uneven structure, and the single wheel pair system 3 under test is in contact with the treads of the two rollers 24, so as to realize the simulation of the wheel-rail load. The load torque simulation device 5 can simulate the load torque of the traction motor caused by the running resistance of the train, which solves the problem that the existing test bench cannot simulate the load torque of the traction motor caused by the running resistance.

Claims

1. A permanent magnet direct drive axle box with built-in single wheel pair system drive control test bench, characterized in that: It includes a mechanical system and a control system; the mechanical system includes a frame and an actuating device, a wheel-rail relationship simulation device, a single wheelset system to be tested, an auxiliary restraint device and a load moment simulation device; The single wheelset system under test is arranged on the wheel-rail relationship simulation device, the auxiliary restraint device is used to fix the single wheelset system under test, the frame and the actuating device apply a vertical load to the single wheelset system under test, and the load moment simulation device applies a load torque to the single wheelset system under test; The control system is used to control the magnitude of the vertical load and load torque applied by the mechanical system to the single wheelset system under test, and to control the driving of the single wheelset system under test.

2. The permanent magnet direct drive axle box built-in single wheelset system drive control test bench according to claim 1 is characterized in that: The frame and the actuating device include a base, the upper end surface of the base is provided with a gantry, the gantry is provided with two hydraulic actuators, the tail ends of the two hydraulic actuators are fixedly connected to the gantry crossbeam, and the output ends of the two hydraulic actuators are used to connect to the auxiliary restraint device.

3. The permanent magnet direct drive axle box built-in single wheelset system drive control test bench according to claim 2 is characterized in that: The wheel-rail relationship simulation device includes a support seat arranged on the upper end surface of the base, two roller axle boxes are horizontally spaced apart on the upper end surface of the support seat, and a roller assembly is rotatably arranged between the two roller axle boxes; the single wheelset system to be tested is arranged on the top of the roller assembly and in contact with it.

4. The permanent magnet direct drive axle box built-in single wheelset system drive control test bench according to claim 3 is characterized in that: The roller assembly includes a rotating shaft and two rollers fixedly arranged at both ends of the rotating shaft, and both ends of the rotating shaft are rotatably connected to the two roller axle boxes through rolling bearings respectively; the treads of the two rollers are arranged as a circumferentially uneven structure; the single wheel pair system under test is in contact with the treads of the two rollers.

5. The permanent magnet direct drive axle box built-in single wheelset system drive control test bench according to claim 4 is characterized in that: The single wheel set system under test comprises a permanent magnet motor, a transmission hollow shaft is mounted inside the permanent magnet motor, the rotor output end of the permanent magnet motor drives the transmission hollow shaft to rotate around its own axis through a coupling, and the other end of the transmission hollow shaft is connected to the axle through a coupling; two wheels are arranged on both sides of the axle; the treads of the two wheels are in contact with the treads of the two rollers respectively; a wheelset axle box is arranged on the inner side of the two wheels, each wheelset axle box is rotatably matched with the axle through a double-row tapered roller bearing, and a first-series rubber pile and a first-series steel spring are arranged on the top of each wheelset axle box; the output ends of the two hydraulic actuators respectively apply vertical loads to the top ends of the two first-series steel springs; The auxiliary restraint device is arranged behind the permanent magnet motor, and a connecting piece for cooperating with the auxiliary restraint device is arranged on the rear end surface of the permanent magnet motor.

6. The permanent magnet direct drive axle box built-in single wheelset system drive control test bench according to claim 5 is characterized in that: The auxiliary restraint device comprises two auxiliary columns arranged behind the permanent magnet motor, an auxiliary crossbeam is arranged between the tops of the two auxiliary columns, and the bottoms of the two auxiliary columns are fixedly connected to the upper end surface of the base; A steel spring axle box restraint device is provided at both ends of the front side of the auxiliary crossbeam; a motor restraint device cooperating with the connecting piece is provided between the two steel spring axle box restraint devices; Each steel spring axle box restraint device includes a first restraint seat fixedly connected to the front side of the auxiliary crossbeam, the top of the restraint seat is provided with a guide groove, and the bottom is provided with a connecting ear with a hole; a dummy frame is slidably arranged in the guide groove, one end of the dummy frame is slidably connected to the guide groove, and the lower end face of the other end is provided with a lower end face cap barrel, the upper end face of the dummy frame and the lower end face cap barrel are respectively in contact with the output end of the hydraulic actuator and the top end of the first series steel spring; the connecting ear with a hole is connected to the swing arm positioning hole of the wheelset axle box through a positioning pin shaft.

7. The permanent magnet direct drive axle box built-in single wheelset system drive control test bench according to claim 6 is characterized in that: The connecting member comprises two first hanging seats and one second hanging seat arranged on the rear end surface of the permanent magnet motor; the two first hanging seats are arranged horizontally at intervals and each of them is provided with a hanging hole; the second hanging seat is located in the middle below the two first hanging seats; The motor restraint device comprises a second restraint seat fixedly connected to the front side of the auxiliary crossbeam, two motor hangers are arranged horizontally at intervals on the second restraint seat, and each of the motor hangers is provided with an elastic rubber node; the two motor hangers are respectively connected to the two first hangers by means of the elastic rubber nodes cooperating with the hanging holes; A motor tie rod seat is arranged at the middle position below the two motor hangers. The motor tie rod seat is connected to a motor tie rod through an elastic rubber node, and the other end of the motor tie rod is connected to the second hanger through an elastic rubber node.

8. The drive control test bench for a single wheelset system with a permanent magnet direct drive axle box built in according to claim 5 is characterized in that: Each of the load torque simulation devices includes a support arranged on one side of the single wheelset system being tested, the bottom of the support is fixedly connected to the upper end surface of the support seat, and a magnetic powder brake is arranged on the top of the support, and the output end of the magnetic powder brake is fixedly connected to one end of the transmission hollow shaft through a coupling.

9. The drive control test bench for a single wheelset system with a permanent magnet direct drive axle box built in according to claim 8 is characterized in that: The control system includes a controller and a frequency converter, a power amplifier and a hydraulic control valve electrically connected to the controller; the frequency converter, the power amplifier and the hydraulic control valve respectively control the permanent magnet motor, the magnetic powder brake and the hydraulic actuator.

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