A drive control test bench for a single wheelset system with a built-in permanent magnet direct drive axle box

Abstract

The present invention discloses a drive control test bench for a single wheelset system with a permanent magnet direct-drive axle box, comprising a mechanical system and a control system; the mechanical system comprises a frame and an actuator, a wheel-rail relationship simulation device, a single wheelset system to be tested, an auxiliary constraint device and a load torque simulation device; 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 to be tested, and to control the drive of the single wheelset system to be tested; the auxiliary constraint device takes the boundary of the permanent magnet motor into more complete consideration, thereby realizing the simulation of the elastic constraint boundary of the motor; the frame and the actuator apply a vertical load to the single wheelset system to be tested, and in combination with the wheel-rail relationship simulation device, realize the simulation of the wheel-rail load; the load torque simulation device can simulate the load torque of the traction motor caused by the running resistance of the train. The drive control test bench for the single wheelset system with a permanent magnet direct-drive axle box in the present invention can provide support for the optimization design of the motor control algorithm of the permanent magnet direct-drive built-in bogie.

Description

Technical Field

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

[0002] Compact transmission drive is a key development direction for bogie drive technology, offering the potential for further bogie lightweighting. A typical example is the permanent magnet direct-drive bogie with an internal axlebox. Compared to traditional bogies, it shortens the lateral span and longitudinal wheelbase, further reducing the weight of the bogie. This 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 range control of the permanent magnet direct-drive internal bogie is a crucial issue for its engineering application. Therefore, establishing a corresponding motor drive control test bench is essential.

[0003] In existing technologies, traditional motor drive control test benches are often in the form of simple towing test benches, that is, the load motor is directly connected to the motor under test through a corresponding mechanical system. For example, the existing invention patent - CN118962435A discloses a dual-motor towing test device and method. However, this type of test device cannot truly simulate the service life 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 wheelset systems, such as the existing invention patent CN111157263A which discloses a wheelset test bench for railway vehicles and CN111006888A which discloses a train air brake anti-skid device performance test method and test bench, these test benches are often not directly applicable to motor control tests for the following reasons:

[0005] First, the wheelsets under test in these test rigs are not actively driven, but are driven to rotate by rollers under the rig;

[0006] Second, these test benches cannot simulate the load torque on the traction motor caused by running resistance;

[0007] Third, these test benches are not designed for permanent magnet direct drive axle box built-in wheelsets. Summary of the Invention

[0008] In response to 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 built-in single wheelset system, and studies the drive control of the permanent magnet direct-drive axle box with a built-in single wheelset system under full-speed working 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 built-in single wheelset system.

[0009] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0010] A drive control test bench for a single wheelset system with a built-in permanent magnet direct-drive axle box is provided, which includes a mechanical system and a control system; the mechanical system includes a frame and an actuator, a wheel-rail relationship simulation device, a single wheelset system under test, an auxiliary restraint device, and a load torque simulation device;

[0011] 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 torque simulation device applies a load torque to the single wheelset system under test;

[0012] 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.

[0013] Furthermore, the frame and 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.

[0014] 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.

[0015] 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; the treads of the two rollers are set 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.

[0016] Furthermore, the single wheelset system under test includes a permanent magnet motor, a transmission hollow shaft is installed 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 provided 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 provided 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 primary rubber pile and a primary steel spring are provided 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 primary steel springs;

[0017] 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 face of the permanent magnet motor.

[0018] Furthermore, the auxiliary restraint device includes two auxiliary columns arranged behind the permanent magnet motor, an auxiliary crossbeam is provided 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;

[0019] A steel spring axle box restraint device is provided at each end of the front face of the auxiliary crossbeam; a motor restraint device cooperating with the connecting piece is provided between the two steel spring axle box restraint devices;

[0020] Each steel spring axle box restraint device includes a first restraint seat fixedly connected to the front face 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 provided 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.

[0021] Furthermore, the connecting member includes two first hangers and one second hanger provided on the rear end surface of the permanent magnet motor; the two first hangers are horizontally spaced apart and each is provided with a hanger hole; the second hanger is located in the middle below the two first hangers;

[0022] The motor restraint device includes a second restraint seat fixedly connected to the front face of the auxiliary crossbeam, two motor hangers are horizontally spaced apart 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;

[0023] A motor pull rod seat is provided in the middle position below the two motor hangers. The motor pull rod seat is connected to a motor pull rod through an elastic rubber node, and the other end of the motor pull rod is connected to the second hanger through an elastic rubber node.

[0024] 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 provided 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.

[0025] 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, power amplifier, and hydraulic control valve respectively control the permanent magnet motor, magnetic powder brake, and hydraulic actuator. Specifically, the controller is typically an industrial personal computer, which sends corresponding control signals to the frequency converter, power amplifier, and hydraulic control valve. The frequency converter is connected to the permanent magnet motor via an electrical circuit to drive the permanent magnet motor to generate torque, thus achieving drive simulation. The power amplifier is connected to the magnetic powder brake via an electrical circuit to drive the magnetic powder brake to generate torque, thus achieving operational resistance simulation. The hydraulic control valve is connected to the hydraulic actuator via an oil circuit to drive the hydraulic actuator to generate a force load, thus achieving suspension load simulation.

[0026] Compared with the existing motor drive control test bench of the towing type, the beneficial effects of the present invention are:

[0027] 1. The permanent magnet direct-drive axle box in the present invention has a built-in single wheelset system drive control test bench. When the auxiliary constraint 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 constraint 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 contacts the two roller treads, thereby realizing the simulation of the wheel-rail load.

[0028] 2. The drive control test bench for a permanent magnet direct-drive axle box with a built-in single wheelset system in this invention is designed based on the structure of a permanent magnet direct-drive built-in bogie. This test bench can conduct drive control experiments on the permanent magnet direct-drive axle box with a built-in wheelset system, providing support for the optimized design of the motor control algorithm for the permanent magnet direct-drive built-in bogie. The use of a load torque simulation device can simulate the load torque of the traction motor caused by the running resistance of the train, solving the problem that existing test benches cannot simulate the load torque on the traction motor caused by running resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a three-dimensional structural schematic diagram of a drive control test bench for a single wheelset system with a built-in permanent magnet direct-drive axle box.

[0030] Figure 2 Schematic diagram of the three-dimensional structure of the frame and actuator.

[0031] Figure 3 Schematic diagram of the three-dimensional structure of the wheel-rail relationship simulation device.

[0032] Figure 4 Schematic diagram of the three-dimensional structure of the single wheelset system under test.

[0033] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the permanent magnet direct-drive hollow shaft transmission system.

[0034] Figure 6 Schematic diagram of the three-dimensional structure of the auxiliary restraint device.

[0035] Figure 7 Schematic diagram of the three-dimensional structure of a single steel spring axle box restraint device.

[0036] Figure 8 Schematic diagram of the three-dimensional structure of a single pseudo-framework.

[0037] Figure 9 Schematic diagram of the three-dimensional structure of the motor constraint device.

[0038] Figure 10 Schematic diagram of the three-dimensional structure of the load torque simulation device.

[0039] Figure 11 This is the principle block diagram of the control system.

[0040] 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. Wheel axle box; 341. Rotating 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. False 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

[0041] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0042] like Figure 1 and Figure 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 actuator 1, a wheel-rail relationship simulation device 2, a tested single wheelset system 3, an auxiliary restraint device 4 and a load torque simulation device 5.

[0043] 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.

[0044] 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.

[0045] Specifically, if 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 crossbeam of the gantry 12, and the output ends of the two hydraulic actuators 13 are used to connect with the auxiliary restraint device 4.

[0046] like Figures 1 to 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.

[0047] The roller assembly includes a rotating shaft 23 and two rollers 24 fixedly arranged at both ends of the rotating shaft 23. 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 to a circumferentially 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.

[0048] 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. The other end of the transmission hollow shaft 40 is connected to the axle 32 through a coupling 37. Two wheels 33 are provided 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 other side, each wheelset axle box 34 is rotatably engaged 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 respectively apply vertical loads to the top ends of the two primary steel springs 36 through the dummy frame 434.

[0049] The auxiliary restraint device 4 is arranged behind the permanent magnet motor 31 , and a connector for cooperating with the auxiliary restraint device 4 is provided on the rear end surface of the permanent magnet motor 31 .

[0050] Preferably, but not limited to, Figures 4 to 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.

[0051] A steel spring axle box restraint device 43 is provided at both ends of the front side of the auxiliary crossbeam 42; and a motor restraint device 44 cooperating with the connecting piece is provided between the two steel spring axle box restraint devices 43.

[0052] Each steel spring axle box restraint device 43 includes a first restraint seat 431 fixedly connected to the front of the auxiliary crossbeam 42, a guide groove 432 is provided on the top of the restraint seat, and a hole-carrying connecting ear 433 is provided on the bottom; a dummy frame 434 is slidingly provided in the guide groove 432, one end of the dummy frame 434 is slidingly 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 hole-carrying connecting ear 433 is connected to the swing arm positioning hole 341 of the wheel axle box 34 through a positioning pin shaft.

[0053] Furthermore, the connecting member includes two first hangers 38 and a 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 hanging hole; the second hanger 39 is located in the middle below the two first hangers 38.

[0054] The motor restraint device 44 includes a second restraint seat 441 fixedly connected to the front of the auxiliary beam 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.

[0055] A motor pull rod seat 443 is provided in the middle position below the two motor hangers 442. The motor pull rod seat 443 is connected to a motor pull rod 444 through an elastic rubber node. The other end of the motor pull rod 444 is connected to the second hanger 39 through an elastic rubber node.

[0056] like Figure 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 to be tested, the bottom of the support 51 is fixedly connected to the upper end surface of the support base 21, and a magnetic powder brake 52 is provided 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.

[0057] like Figure 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, power amplifier, and hydraulic control valve respectively control the permanent magnet motor 31, the magnetic powder brake 52, and the hydraulic actuator 13. Specifically, the controller is typically an industrial personal computer, which sends corresponding control signals to the frequency converter, power amplifier, and hydraulic control valve. The frequency converter is connected to the permanent magnet motor 31 via an electrical circuit to drive the permanent magnet motor 31 to generate torque, thus achieving drive simulation. The power amplifier is connected to the magnetic powder brake 52 via an electrical circuit to drive the magnetic powder brake 52 to generate torque, thus achieving operational resistance simulation. The hydraulic control valve is connected to the hydraulic actuator 13 via an oil circuit to drive the hydraulic actuator 13 to generate a force load, thus achieving suspension load simulation.

[0058] In summary, the drive control test bench for a permanent magnet direct-drive axle box with a built-in single wheelset system in the present invention is designed based on the structure of a permanent magnet direct-drive built-in bogie, and can conduct drive control test research on the permanent magnet direct-drive axle box with a built-in wheelset system, providing support for the optimized design of the motor control algorithm for the permanent magnet direct-drive built-in bogie. When fixing the tested single wheelset system 3, the auxiliary restraint device 4 more comprehensively considers the boundaries of the permanent magnet motor 31, achieving simulation of the motor's elastic constraint boundary; the hydraulic actuator 13 can apply a vertical load to the tested single wheelset system 3, while the tread of the roller 24 is configured as a circumferentially uneven structure, and the tested single wheelset system 3 contacts the treads of the two rollers 24, achieving 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, solving the problem that existing test benches cannot simulate the load torque of the traction motor caused by running resistance.

Claims

1. A permanent magnet direct drive axle box with a built-in single wheelset 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 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 torque 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 drive of the single wheelset system under test; The frame and actuating device includes 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; 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 top of the roller assembly and contacts it; The single wheelset system under test includes a permanent magnet motor, a transmission hollow shaft is installed 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 provided 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 provided 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 primary rubber pile and a primary steel spring are provided 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 primary steel springs; The auxiliary restraint device is arranged behind the permanent magnet motor, and a connector for cooperating with the auxiliary restraint device is arranged on the rear end face of the permanent magnet motor; The single wheelset system under test includes a permanent magnet motor, a transmission hollow shaft is installed 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 provided 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 provided 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 primary rubber pile and a primary steel spring are provided 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 primary steel springs; The auxiliary restraint device is arranged behind the permanent magnet motor, and a connector for cooperating with the auxiliary restraint device is arranged on the rear end face of the permanent magnet motor; The auxiliary restraint device includes 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 each end of the front face 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 face 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 provided 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 rotating arm positioning hole of the wheelset axle box through a positioning pin shaft; 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 provided 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.

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 roller assembly includes a rotating shaft and two rollers fixedly arranged at both ends of the rotating shaft. Both ends of the rotating shaft are rotatably connected to the two roller axle boxes through rolling bearings; the treads of the two rollers are arranged to have a circumferentially uneven structure; the single wheelset system under test is in contact with the treads of the two rollers.

3. 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 connecting member includes two first hangers and one second hanger provided on the rear end surface of the permanent magnet motor; the two first hangers are arranged horizontally and spaced apart and each of them is provided with a hanger hole; the second hanger is located in the middle below the two first hangers; The motor restraint device includes a second restraint seat fixedly connected to the front face of the auxiliary crossbeam, two motor hangers are horizontally spaced apart 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 pull rod seat is provided in the middle position below the two motor hangers. The motor pull rod seat is connected to a motor pull rod through an elastic rubber node, and the other end of the motor pull rod is connected to the second hanger through an elastic rubber node.

4. 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 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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