A multi-point synchronous rotation excitation and testing system

Abstract

A multi-point synchronous rotary excitation and testing system belongs to the excitation and testing system. The present invention aims to solve the problems that the current method of separately exciting each support position on the rotating shaft cannot reflect the synchronous dynamic rotary excitation received by all supports on the same rotating shaft. At the same time, it solves the problems that the existing single-direction and single-frequency electromagnetic exciters are large in volume and cannot be installed in the narrow space of the support position, cannot simulate the complex combination of excitation forces with various rotation directions, speeds, amplitudes, and phases received by multiple rotor systems simultaneously, and cannot reflect the true excitation state of multiple rotor systems under different working conditions. The device of the present invention includes a host computer 1, a frequency converter group 2, N resolvers 3, and N rotary excitation devices 4. The main frequency converter controls the main excitation device to control the rotation speed, and the slave frequency converter combines the signals of the corresponding resolver and the resolver of the main excitation device to control the phase turned by the corresponding rotary excitation device, thereby achieving the purpose of multi-point synchronous rotary excitation testing.

Description

Technical Field

[0001] The present invention relates to an excitation and testing system, and particularly to a multi-point synchronous rotary excitation and testing system. Background Art

[0002] Experimental testing is one of the important means to accurately master the dynamic characteristics of the rotor-bearing-casing system, including links such as excitation, testing, and data analysis. Among them, excitation is the most critical link in the dynamic experimental research of the rotor-bearing-casing system.

[0003] The vibration of the engine mainly comes from the dynamic rotary excitation of each rotor. At present, the tests for obtaining the vibration characteristics of the whole machine are all carried out on the hot test bench, which is costly and has many interference factors. The engine is a complex multi-rotor system, and the dynamic rotary excitations received by the supports spanned by the same rotating shaft are synchronous. The current method of separately exciting the support positions cannot achieve synchronous excitation. Moreover, the existing excitation devices are mainly single-direction and single-frequency electromagnetic exciters, which are large in size and cannot be installed in the narrow support positions, and cannot simulate the dynamic rotary excitation force generated by the operation of the rotor of the rotating machinery. Therefore, the existing technology cannot simulate the complex excitation forces with various combinations of rotation directions, speeds, amplitudes, and phases simultaneously received by the multi-rotor system, and cannot reflect the true excitation state of the multi-rotor-bearing-casing system under different working conditions.

[0004] Therefore, it is very important to develop a testing system with multiple rotary excitation devices for multi-point excitation, and which can adjust the rotation direction, speed, excitation force amplitude, and phase of each rotary excitation device according to the operating conditions of the rotating machinery to meet the industry requirements in the current field of multi-rotor rotating machinery. Summary of the Invention

[0005] The present invention aims to solve the problem that the current method of separately exciting each support position on the rotating shaft cannot reflect the synchronous dynamic rotary excitation received by all supports on the same rotating shaft. At the same time, it solves the problems that the existing excitation devices are mainly single-direction and single-frequency electromagnetic exciters, which are large in size and cannot be installed in the narrow support positions, and cannot simulate the dynamic rotary excitation force generated by the operation of the rotor of the rotating machinery, and cannot simulate the complex excitation forces with various combinations of rotation directions, speeds, amplitudes, and phases simultaneously received by the multi-rotor system, and cannot reflect the true excitation state of the multi-rotor-bearing-casing system under different working conditions. Furthermore, a multi-point synchronous rotary excitation and testing system is provided;

[0006] A multi-point synchronous rotary excitation and testing system, the system includes a host computer, a frequency converter group, N resolver transformers and N rotary excitation devices, where N is a positive integer;

[0007] The frequency converter group includes a main frequency converter and N - 1 slave frequency converters;

[0008] The host computer is signal-connected to the main frequency converter and N-1 slave frequency converters in the frequency converter group through a data transmission line. The phase signal output end of the main frequency converter is connected to the phase signal comparison ends of the N-1 slave frequency converters through a cable. The signal feedback end of the main frequency converter is connected to a resolver through a cable. The rotor part of the resolver connected to the main frequency converter is sleeved on the outer extension of a rotary excitation device. The signal command end of the main frequency converter is connected to the power end of the corresponding rotary excitation device. The signal feedback end of each slave frequency converter is connected to a resolver through a cable. The rotor part of the resolver connected to the slave frequency converter is sleeved on the outer extension of a rotary excitation device. The signal command end of each slave frequency converter is connected to the power end of the corresponding rotary excitation device;

[0009] Further, the rotary excitation device includes a rotor, a power component, a housing, a bearing seat, a front bearing cover, a rear bearing cover, an outer ring base, and four force sensors;

[0010] The power component includes a stator coil and a rotor core;

[0011] The rotor is inserted into the housing, and the front end of the rotor extends to the outside of the housing. A first rotating bearing is sleeved on the outer circular surface of the front end of the rotor. The inner ring of the bearing of the first rotating bearing is fixedly connected to the outer circular surface of the front end of the rotor, and the outer ring of the bearing of the first rotating bearing is fixedly connected to the inner wall of the housing. The front end of the housing is provided with a front bearing cover. The front bearing cover is detachably connected to the end of the housing through bolts. A through hole is machined at the center of the front bearing cover. The front end of the rotor passes through the through hole on the front bearing cover and extends to the outside of the housing as the outer extension of the rotor. The rotor part of the resolver is sleeved on the outer extension of the rotor. The power component is arranged between the rotor and the housing. The rotor core in the power component is sleeved on the rotor, and the stator coil is embedded on the inner wall of the housing. The rotor core and the stator coil are arranged correspondingly. A bearing seat is embedded at the rear end of the housing. A second rotating bearing is installed in the bearing seat. The inner ring of the bearing of the second rotating bearing is fixedly connected to the outer circular surface of the rotor, and the outer ring of the bearing of the second rotating bearing is fixedly connected to the bearing seat. A rear bearing cover is arranged at the end of the bearing seat. The rear bearing cover is detachably connected to the bearing seat through bolts. An outer ring base is sleeved outside the housing. Four force sensors are embedded equidistantly along the circumferential direction between the housing and the outer ring base;

[0012] Further, a plurality of threaded holes are machined equidistantly along the circumferential direction on the end face of the shaft section with the largest diameter of the middle end face of the rotor;

[0013] Further, the rotary excitation device further includes a compression nut. External threads are machined on the outer circular surface of the outer extension of the rotor. The compression nut is sleeved on the end face of the outer extension of the rotor, and the compression nut is detachably connected to the outer extension of the rotor by threads;

[0014] Furthermore, the rotary excitation device further includes a measurement bracket which is arranged horizontally on the outer end face of the front bearing cover, and the measurement bracket is fixedly connected to the front bearing cover by bolts;

[0015] Furthermore, a measurement hole is machined vertically on the measurement bracket, a keyway is machined on the outer cylindrical surface of the compression nut, and the measurement hole and the keyway are arranged correspondingly;

[0016] Furthermore, a plurality of claw hooks are provided on one side of the resolver close to the front bearing cover, and the stator part in the resolver is detachably connected to the front bearing cover through the plurality of claw hooks;

[0017] Furthermore, the rotary excitation device further includes a junction box which is arranged on the outer cylindrical surface of the housing at one end close to the resolver, and the junction box is fixedly welded to the housing. An aviation plug is installed on the junction box, and the lead wire of the stator coil is connected to the aviation plug through the junction box;

[0018] Furthermore, a plurality of windows are machined on the end face of the housing section which is arranged in cooperation with the shaft section with the largest middle end face of the rotor, and each window is arranged correspondingly to a threaded hole.

[0019] The present invention has the following beneficial effects compared with the prior art:

[0020] A multi-point synchronous rotary excitation and testing system provided by the present invention can perform synchronous rotary excitation on multiple excitation points. The phase error of each excitation device is very small, the excitation force can be output in real time, and various combinations of the rotation direction, rotation speed, excitation force amplitude and phase of multiple excitation points can be realized. A plurality of threaded holes are evenly distributed along the circumference of the disk in the rotary excitation rotor. By adjusting the mass and phase of the screws screwed into the disk of the rotor of each rotary excitation device, the combination of the excitation force with different amplitudes and phases at different excitation points is adjusted, so that the adjustment of the excitation force amplitude and phase is very easy, and the real excitation state of various working conditions of the multi-rotor-bearing-casing system can be truly simulated. Brief Description of the Drawings

[0021] Figure 1 is a schematic diagram of the multi-point excitation device of the present invention;

[0022] Figure 2 is a flow chart of the multi-point excitation method of the present invention;

[0023] Figure 3 is a cross-sectional view of the rotary excitation device in the present invention;

[0024] Figure 4 is a schematic diagram of the rotary excitation device in the present invention;

[0025] Figure 5 is a left view of the rotary excitation device in the present invention;

[0026] Figure 6 It is the right view of the rotary excitation device in the present invention;

[0027] Figure 7 It is the left view of the rotor of the rotary excitation device in the present invention;

[0028] Figure 8 It is the cross-sectional view of the rotor of the rotary excitation device in the present invention;

[0029] Figure 9 It is the schematic diagram of the pressing screw head in the present invention;

[0030] Figure 10 It is the schematic diagram of the measuring bracket in the present invention;

[0031] In the figure, 1 is the upper computer, 2 is the frequency converter group, 2-1 is the main frequency converter, 2-2 is the slave frequency converter, 3 is the resolver, 4 is the rotary excitation device, 5 is the rotor, 6 is the power component, 6-1 is the stator coil, 6-2 is the rotor core, 7 is the housing, 8 is the bearing seat, 9 is the front bearing cover, 10 is the rear bearing cover, 11 is the force sensor, 12 is the outer ring base, 13 is the pressing nut, 13-1 is the keyway, 14 is the measuring bracket, 14-1 is the measuring hole, 15 is the claw, 16 is the junction box, and 17 is the engine casing. Detailed implementation manners

[0032] Detailed implementation manner one: Refer to Figures 1 to 10 to describe this implementation manner. This implementation manner provides a multi-point synchronous rotary excitation and testing system. The system includes an upper computer 1, a frequency converter group 2, N resolvers 3, and N rotary excitation devices 4, where N is a positive integer;

[0033] The frequency converter group 2 includes one main frequency converter 2-1 and N-1 slave frequency converters 2-2;

[0034] The upper computer 1 is signal-connected to the main frequency converter 2-1 and N-1 slave frequency converters 2-2 in the frequency converter group 2 through a data transmission line. The phase signal output end of the main frequency converter 2-1 is connected to the phase signal comparison ends of N-1 slave frequency converters 2-2 through a cable. The signal feedback end of the main frequency converter 2-1 is connected to a resolver 3 through a cable. The rotor part of the resolver 3 connected to the main frequency converter 2-1 is sleeved on the outer extension of a rotary excitation device 4. The signal command end of the main frequency converter 2-1 is connected to the power end of the corresponding rotary excitation device 4. The signal feedback end of each slave frequency converter 2-2 is connected to a resolver 3 through a cable. The rotor part of the resolver 3 connected to the slave frequency converter 2-2 is sleeved on the outer extension of a rotary excitation device 4. The signal command end of each slave frequency converter 2-2 is connected to the power end of the corresponding rotary excitation device 4.

[0035] In this embodiment, the multi-point synchronous rotary excitation and testing system includes a host computer 1, an inverter 2, a resolver 3 and a rotary excitation device 4. The inverter 2 is divided into one main inverter 2-1 and multiple slave inverters 2-2. Each inverter 2 controls a rotary excitation device 4 respectively. Each rotary excitation device 4 is equipped with a resolver 3. The resolver 3 is connected to the inverter 2 through an RS232 communication cable to collect the phase signals of the rotor 5 of each rotary excitation device and input them into each inverter through the communication cable. The main inverter 2-1 controls the speed of the built-in motor 6 of the corresponding rotary excitation device. The motor 6 drives the rotor 5 of the rotary excitation device to rotate. The resolver 3 records the phase of the rotor 5 and inputs the phase signal into the main inverter 2-1. The main inverter 2-1 and the slave inverters 2-2 are connected through an RS232 communication cable. The main inverter 2-1 inputs the phase signal of the rotor 5 of the controlled rotary excitation device into the slave inverters 2-2. The slave inverters 2-2 compare the phase signal transmitted by the main inverter 2-1 with the phase signal of the rotor 5 of the corresponding rotary excitation device measured by the resolver 3 multiple times, and control the power component 6 built in the corresponding rotary excitation device to rotate to the corresponding position of the phase signal transmitted by the main inverter 2-1, so that it can continuously follow the power component 6 of the rotary excitation device controlled by the main inverter 2-1 to rotate to the same phase, thus ensuring that the speeds of each rotary excitation device are the same. The host computer 1 and the inverter 2 adopt USART serial communication. After the host computer 1 and the inverter 2 are connected through a communication cable, the operating parameters of each inverter 2 are changed by means of graphical programming, so as to achieve the purpose of adjusting the rotation directions and speeds of each rotary excitation device;

[0036] After connecting and starting the main inverter 2-1 and the slave inverters 2-2, only by controlling the main inverter 2-1 can all the power components 6 work at the speed set by the main inverter 2-1;

[0037] The program parameters can be changed through the host computer 1 so that the speed of the rotary excitation device controlled by the main inverter 2-1 and the speed of the rotary excitation device controlled by the slave inverters 2-2 form a fixed ratio;

[0038] The inverter 2 can realize stepless change of the speed of the power component 6. The inverter 2 has two operation modes: operation through the host computer and operation through its own panel. The speed can be adjusted by changing the program parameters through the host computer 1 or directly adjusted through the operation of the main inverter panel;

[0039] After setting the program parameters of each inverter 2 through the host computer 1, determining the speed ratio of the rotary excitation device controlled by the main inverter 2-1 and the rotary excitation device controlled by the slave inverters 2-2, and the rotation directions of each rotary excitation device, after turning on the operation of the main inverter panel, the host computer 1 can be disconnected, and the main inverter 2-1 can be controlled alone for multi-point rotary excitation operation;

[0040] In this embodiment, during normal operation, the host computer only needs to be connected to the main frequency converter 2-1. Only when programming the slave frequency converter programs is it necessary to connect each slave frequency converter 2-2. After all the frequency converter programs are imported separately, the host computer only needs to be connected to and control the main frequency converter 2-1.

[0041] Specific Embodiment 2: Refer to Figures 1 to 10 To illustrate this embodiment, this embodiment further defines the rotary excitation device 4 described in Specific Embodiment 1. In this embodiment, the rotary excitation device 4 includes a rotor 5, a power component 6, a housing 7, a bearing seat 8, a front bearing cover 9, a rear bearing cover 10, an outer ring base 12, and four force sensors 11;

[0042] The power component 6 includes a stator coil 6-1 and a rotor core 6-2;

[0043] The rotor 5 is inserted into the housing 7, and the front end of the rotor 5 extends to the outside of the housing 7. A first rotating bearing is sleeved on the outer circumferential surface of the front end of the rotor 5, and the inner ring of the bearing of the first rotating bearing is fixedly connected to the outer circumferential surface of the front end of the rotor 5, and the outer ring of the bearing of the first rotating bearing is fixedly connected to the inner wall of the housing 7. The front end of the housing 7 is provided with a front bearing cover 9, and the front bearing cover 9 is detachably connected to the end of the housing 7 by bolts. A through hole is machined at the center of the front bearing cover 9, and the front end of the rotor 5 passes through the through hole on the front bearing cover 9 and extends to the outside of the housing 7 as the extended portion of the rotor 5. The rotor part in the resolver 3 is sleeved on the extended portion of the rotor 5. The power component 6 is arranged between the rotor 5 and the housing 7. The rotor core 6-2 in the power component 6 is sleeved on the rotor 5, and the stator coil 6-1 is embedded on the inner wall of the housing 7, and the rotor core 6-2 and the stator coil 6-1 are arranged corresponding to each other. The bearing seat 8 is embedded at the rear end of the housing 7, a second rotating bearing is installed in the bearing seat 8, the inner ring of the bearing of the second rotating bearing is fixedly connected to the outer circumferential surface of the rotor 5, and the outer ring of the bearing of the second rotating bearing is fixedly connected to the bearing seat 8. The end of the bearing seat 8 is provided with a rear bearing cover 10, and the rear bearing cover 10 is detachably connected to the bearing seat 8 by bolts. The outer ring base 12 is sleeved outside the housing 7, and four force sensors 11 are embedded equidistantly along the circumference between the housing 7 and the outer ring base 12. Other compositions and connection methods are the same as those in Specific Embodiment 1.

[0044] Specific Embodiment 3: Refer to Figures 1 to 10 To illustrate this embodiment, this embodiment further defines the rotor 5 described in Specific Embodiment 2. In this embodiment, a plurality of threaded holes 5-1 are machined equidistantly along the circumference on the end face of the shaft section with the largest end face diameter in the rotor 5. Other compositions and connection methods are the same as those in Specific Embodiment 1.

[0045] In this embodiment, several threaded holes 5-1 are evenly distributed along the circumference of the end face of the shaft section with the largest end face diameter in the rotor 5, and the amplitude and phase of the output exciting force are adjusted by the mass and phase of the screws screwed into the rotor 5.

[0046] Specific Embodiment Four: Refer to Figures 1 to 10 To describe this embodiment, this embodiment further limits the rotary exciting device 4 described in Specific Embodiment Three. In this embodiment, the rotary exciting device 4 further includes a compression nut 13. An external thread is machined on the outer cylindrical surface of the outer extension part of the rotor 5. The compression nut 13 is sleeved on the end face of the outer extension part of the rotor 5, and the compression nut 13 is detachably connected to the outer extension part of the rotor 5 by threads. Other components and connection methods are the same as those in Specific Embodiment Three.

[0047] With such a setting, the rotor part of the resolver 3 is clamped and fixed by the compression nut 13.

[0048] Specific Embodiment Five: Refer to Figures 1 to 10 To describe this embodiment, this embodiment further limits the rotary exciting device 4 described in Specific Embodiment Four. In this embodiment, the rotary exciting device 4 further includes a measuring bracket 14. The measuring bracket 14 is arranged horizontally on the outer end face of the front bearing cover 9, and the measuring bracket 14 is fixedly connected to the front bearing cover 9 by bolts. Other components and connection methods are the same as those in Specific Embodiment Four.

[0049] With such a setting, the measuring bracket 14 is convenient for installing and fixing the sensor.

[0050] Specific Embodiment Six: Refer to Figures 1 to 10 To describe this embodiment, this embodiment further limits the measuring bracket 14 described in Specific Embodiment Five. In this embodiment, a measuring hole 14-1 is machined on the measuring bracket 14 along the vertical direction, and a keyway 13-1 is machined on the outer cylindrical surface of the compression nut 13, and the measuring hole 14-1 and the keyway 13-1 are arranged corresponding to each other. Other components and connection methods are the same as those in Specific Embodiment Five.

[0051] With such a setting, the actual rotational speed of the exciting device at each exciting point can be measured by the sensor.

[0052] Specific Embodiment Seven: Refer to Figures 1 to 10 To describe this embodiment, this embodiment further limits the resolver 3 described in Specific Embodiment Six. In this embodiment, a plurality of hook claws 15 are provided on one side of the resolver 3 close to the front bearing cover 9, and the stator part in the resolver 3 is detachably connected to the front bearing cover 9 through the plurality of hook claws 15. Other components and connection methods are the same as those in Specific Embodiment Six.

[0053] With such a setting, the connection stability of the resolver 3 can be improved. The resolver 3 is divided into a rotor and a stator. The rotor part is fixed to the rotating shaft by a compression nut, and the stator part is fixed to the outer shell of the excitation device. The two parts need to be aligned.

[0054] Specific Embodiment VIII: Refer to Figures 1 to 10 to describe this embodiment. This embodiment further limits the rotary excitation device 4 described in Specific Embodiment VII. In this embodiment, the rotary excitation device 4 further includes a junction box 16. The junction box 16 is arranged on the outer circumferential surface of the housing 7 near the resolver 3, and the junction box 16 is fixedly welded to the housing 7. An aviation plug is installed on the junction box 16. The lead wire of the stator coil 6-1 is connected to the aviation plug via the junction box 16. Other components and connection methods are the same as those in Specific Embodiment VII.

[0055] Specific Embodiment IX: Refer to Figures 1 to 10 to describe this embodiment. This embodiment further limits the housing 7 described in Specific Embodiment VIII. In this embodiment, a plurality of windows are machined on the end face of the housing section of the housing 7 that is matched with the shaft section with the largest end face in the rotor 5. Each window is correspondingly arranged with a threaded hole 5-1. Other components and connection methods are the same as those in Specific Embodiment VIII.

[0056] The present invention has been disclosed with the above preferred embodiments. However, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed structure and technical content to form equivalent embodiments of equivalent changes. However, as long as the content does not depart from the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

[0057] Working Principle

[0058] When the present invention is in use, first, each component is connected together according to the connection methods described in Embodiments 1 to 9. The host computer 1 controls the operating parameters of the main frequency converter 2-1 and N-1 slave frequency converters 2-2 in the frequency converter group 2 through a program of graphical programming. Since the main frequency converter 2-1 and the N-1 slave frequency converters 2-2 are connected by cables, during the operation of the system, only by controlling the main frequency converter 2-1, all the power components 6 can be simultaneously controlled to work at the rotational speed set by the main frequency converter 2-1. After the main frequency converter 2-1 is turned on, the host computer 1 can be disconnected first and the multi-point rotation test can be carried out by controlling the main frequency converter 2-1. Each rotary excitation device 4 receives the rotational speed command transmitted by the corresponding frequency converter. The power component 6 in the rotary excitation device 4 will drive the rotor 5 to rotate by being powered on (the lead end is connected to an external power supply through a junction box 16), and the phase is recorded by a resolver 3, and the recorded value is transmitted to the corresponding frequency converter for comparison. By comparing the phases of each slave excitation device and the main excitation device, the phase turned by each slave excitation device is made to be consistent with that of the main excitation device, so as to achieve the purpose of multi-point synchronous rotary excitation test. In addition, the measuring bracket 14 is used to fix another displacement sensor to record the change of the position signal of the keyway 13-1 on the compression nut 13 at the end of the rotor 5 per revolution, and the rotational speed of the rotary excitation device can be derived therefrom.

Claims

1. A multi-point synchronous rotation excitation and testing system, characterized in that: the system includes a host computer (1), a frequency converter group (2), N resolver (3) and N rotary excitation devices (4), where N is a positive integer; the frequency converter group (2) includes a main frequency converter (2-1) and N-1 slave frequency converters (2-2); the host computer (1) is signal-connected to the main frequency converter (2-1) and N-1 slave frequency converters (2-2) in the frequency converter group (2) through a data transmission line. The phase signal output end of the main frequency converter (2-1) is connected to the phase signal comparison end in N-1 slave frequency converters (2-2) through a cable. The signal feedback end of the main frequency converter (2-1) is connected to a resolver (3) through a cable. The rotor part in the resolver (3) connected to the main frequency converter (2-1) is sleeved on the extension part of a rotary excitation device (4). The signal command end of the main frequency converter (2-1) is connected to the power end of the corresponding rotary excitation device (4). The signal feedback end of each slave frequency converter (2-2) is connected to a resolver (3) through a cable. The rotor part in the resolver (3) connected to the slave frequency converter (2-2) is sleeved on the extension part of a rotary excitation device (4). The signal command end of each slave frequency converter (2-2) is connected to the power end of the corresponding rotary excitation device (4) the rotary excitation device (4) includes a rotor (5), a power component (6), a housing (7), a bearing seat (8), a front bearing cover (9), a rear bearing cover (10), an outer ring base (12) and four force sensors (11); the power component (6) includes a stator coil (6-1) and a rotor core (6-2); The rotor (5) is inserted into the housing (7), and the front end of the rotor (5) extends to the outside of the housing (7). A first rotating bearing is sleeved on the outer circumferential surface of the front end of the rotor (5), and the inner ring of the bearing of the first rotating bearing is fixedly connected to the outer circumferential surface of the front end of the rotor (5), and the outer ring of the bearing of the first rotating bearing is fixedly connected to the inner wall of the housing (7). A front bearing cover (9) is provided at the front end of the housing (7), and the front bearing cover (9) is detachably connected to the end of the housing (7) by bolts. A through hole is machined at the center of the front bearing cover (9), and the front end of the rotor (5) passes through the through hole on the front bearing cover (9) and extends to the outside of the housing (7) as the extended portion of the rotor (5). The rotor part in the resolver (3) is sleeved on the extended portion of the rotor (5). The power component (6) is arranged between the rotor (5) and the housing (7). The rotor core (6-2) in the power component (6) is sleeved on the rotor (5), and the stator coil (6-1) is embedded on the inner wall of the housing (7), and the rotor core (6-2) and the stator coil (6-1) are arranged corresponding to each other. A bearing seat (8) is embedded at the rear end of the housing (7). A second rotating bearing is installed in the bearing seat (8). The inner ring of the bearing of the second rotating bearing is fixedly connected to the outer circumferential surface of the rotor (5), and the outer ring of the bearing of the second rotating bearing is fixedly connected to the bearing seat (8). A rear bearing cover (10) is provided at the end of the bearing seat (8), and the rear bearing cover (10) is detachably connected to the bearing seat (8) by bolts. An outer ring base (12) is sleeved outside the housing (7), and four force sensors (11) are equidistantly embedded in the circumferential direction between the housing (7) and the outer ring base (12); The rotary excitation device (4) further includes a compression nut (13). External threads are machined on the outer circumferential surface of the extended portion of the rotor (5). The compression nut (13) is sleeved on the end face of the extended portion of the rotor (5), and the compression nut (13) is detachably connected to the extended portion of the rotor (5) by threads; The rotary excitation device (4) further includes a measuring bracket (14). The measuring bracket (14) is arranged horizontally on the outer end face of the front bearing cover (9), and the measuring bracket (14) is fixedly connected to the front bearing cover (9) by bolts; A measuring hole (14-1) is machined vertically on the measuring bracket (14). A keyway (13-1) is machined on the outer circumferential surface of the compression nut (13), and the measuring hole (14-1) and the keyway (13-1) are arranged corresponding to each other; A plurality of claw hooks (15) are provided on one side of the resolver (3) close to the front bearing cover (9). The stator part in the resolver (3) is detachably connected to the front bearing cover (9) through the plurality of claw hooks (15).

2. A multi-point synchronous rotary excitation and testing system according to claim 1, characterized in that: A plurality of threaded holes (5-1) are machined equidistantly in the circumferential direction on the end face of the shaft section with the largest end face diameter in the rotor (5).

3. A multi-point synchronous rotary excitation and testing system according to claim 2, characterized in that: The rotary excitation device (4) further includes a junction box (16). The junction box (16) is arranged on the outer circumferential surface of the housing (7) near one end of the resolver (3), and the junction box (16) is fixedly welded to the housing (7). An aviation plug is installed on the junction box (16), and the lead wire of the stator coil (6-1) is connected to the aviation plug via the junction box (16).

4. A multi-point synchronous rotary excitation and testing system according to claim 3, characterized in that: A plurality of windows are machined on the end surface of the housing section of the housing (7) that is matched with the shaft section having the largest end face of the rotor (5). Each window is correspondingly arranged with a threaded hole (5-1).

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