High-speed permanent magnet motor rotor sheath stress semi-online measurement device and method

Abstract

The invention discloses a high-speed permanent magnet motor rotor sheath stress semi-online measurement device and method, the shaft extension end of a high-speed permanent magnet motor extends into a temperature box to be connected with and rotate an inertia disc, and a sensor is arranged on the circumferential side wall of the inertia disc to detect the inner layer radial stress of a to-be-measured rotor sheath in contact with the sensor; the sensor leads out a contact terminal from the end face of the inertia disc, and the contact terminal is in sliding connection with a slip ring electricity leading device installed on the temperature box so as to collect a sensor detection signal for semi-online measurement. According to the device and the method, the actual working condition of the high-speed permanent magnet motor rotor sheath can be simulated, stress monitoring is realized by arranging the sensor and the slip ring electricity leading device, and the accuracy and the effectiveness of a test result are ensured through a dynamic balance test and a test process of gradually increasing the rotating speed.

Description

Technical Field

[0001] The present invention relates to a semi-online measuring device and method, and in particular to a semi-online measuring device and method for a high-speed permanent magnet motor rotor sleeve stress. Background Art

[0002] In high-speed permanent magnet motors, sintered NdFeB permanent magnet materials are used. Although this type of material has a large compressive strength, its tensile strength is relatively low. When the motor is running at high speed, the permanent magnet needs to withstand huge centrifugal force, which is difficult for the permanent magnet itself to withstand. Therefore, in order to protect the permanent magnet and ensure the stable operation of the motor, a rotor sleeve must be used. In the fields of compressors, flywheel energy storage, electric spindles, high-speed machine tools and new energy vehicles, high-speed permanent magnet motors are increasingly using fiber-reinforced composite rotor sleeves.

[0003] High-speed permanent magnet motors are widely used in compressors, flywheel energy storage, electric spindles, high-speed machine tools, and new energy vehicles. Their rotor sleeves are usually made of fiber-reinforced composite materials, especially carbon fiber composite materials, to protect the permanent magnets from the huge centrifugal force generated by high-speed rotation. Although the reliability of carbon fiber composite sleeves currently depends mainly on the initial stress design and temporarily meets the basic needs of engineering applications, there is still a lack of long-term operating test data.

[0004] In fact, the fiber reinforced composite jacket operates in a complex multi-physical field environment such as centrifugal force, stress concentration and rotor temperature field. Its long-term mechanical properties will be significantly affected by the force-heat coupling environment, which may lead to creep and stress relaxation, thereby reducing internal stress and affecting the protective effect of the jacket on the permanent magnet, and then affecting the overall performance and reliability of the motor. Since it is very difficult to detect the inner layer stress of the jacket online in a high-speed motor, it faces a series of challenges such as sensor layout, signal transmission, rotor dynamic balance and interference rotor dynamics design. There is a lack of experimental verification means for the applicability and reliability of the initial design parameters. Therefore, semi-online service performance testing that simulates the actual operating environment of the composite jacket becomes crucial. By evaluating the reliability of the jacket material, structure and process under conditions close to the actual working conditions, and monitoring the performance of the jacket under different working conditions, it provides an important basis for the design and optimization of high-speed motors. Such tests not only help to extend the service life of the motor, but also improve its operating efficiency and ensure the stability and reliability of the motor in long-term operation.

[0005] At present, there is no patent related to the testing device and method for the service performance of the carbon fiber sheath of the high-speed motor rotor. New technology is urgently needed to fill this gap, focus on the measurement of the inner layer stress provided by the rotor sheath during the dynamic operation of the motor, analyze the characteristics of the sheath during the dynamic operation, provide a scientific basis for optimizing the sheath winding process, and improve the reliability of the sheath in practical applications. Summary of the invention

[0006] In order to solve the deficiencies existing in the above-mentioned technologies, the present invention provides a semi-online measurement device and method for the rotor sheath stress of a high-speed permanent magnet motor.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a semi-online measurement device for the rotor sheath stress of a high-speed permanent magnet motor, the shaft extension end of the high-speed permanent magnet motor is extended into a temperature box to connect and rotate the inertia disk, a sensor is arranged on the circumferential side wall of the inertia disk to detect the inner radial stress of the rotor sheath to be measured in contact with it, the sensor leads out a contact terminal from the end face of the inertia disk, and the contact terminal is slidably connected to the slip ring induction device installed on the temperature box to collect the sensor detection signal for semi-online measurement.

[0008] Furthermore, the inertia disk includes a ring sleeve 1, an intermediate roller and a ring sleeve 2. The ring sleeve 1 and the ring sleeve 2 are correspondingly nested and fixed at the two ends of the intermediate roller. The centers of the ring sleeve 1, the intermediate roller and the ring sleeve 2 are jointly provided with a through hole for the shaft extension end of the high-speed permanent magnet motor to extend into the temperature box to connect and rotate the inertia disk.

[0009] Furthermore, the radial widths of the first and second ring sleeves are greater than the radial width of the intermediate roller, and the first and second ring sleeves and the circumferential side walls of the intermediate roller together form a groove that contacts the rotor sleeve to be tested.

[0010] Furthermore, an embedding groove for installing the sensor is provided on the circumferential side wall of the intermediate roller, and an outlet wire groove is provided on the end surface of the inertia disk on the side where the contact terminal is led out, and the outlet wire groove is connected to the embedding groove.

[0011] Furthermore, there are multiple groups of embedding grooves which are symmetrically arranged along the axial center of the middle roller. An end face hole channel is pierced on the end face of the opening of the embedding groove corresponding to the second ring sleeve, and the outlet wire groove is connected to the embedding groove through the end face hole channel.

[0012] Furthermore, a gasket is provided on the shaft extension end of the high-speed permanent magnet motor close to the contact terminal, and a gasket hole for passing the contact terminal is opened on the gasket.

[0013] Furthermore, a locking nut is spirally connected to the shaft extension end of the high-speed permanent magnet motor, the locking nut is locked on the side of the gasket close to the slip ring induction device, and the locking nut is also inserted into the inner hole of the slip ring induction device.

[0014] Furthermore, a circle of wire management grooves is provided on the side of the gasket close to the slip ring inductor, the wire management grooves are connected to the gasket channel, and the wire management grooves are located at the periphery of the fitting surface formed after the gasket and the locking nut are locked.

[0015] Furthermore, the temperature box is provided with a detachable side panel, the detachable side panel is provided with a mounting seat, and the slip ring inductor is embedded in the mounting seat.

[0016] A testing method for a semi-online measuring device for a high-speed permanent magnet motor rotor sleeve stress comprises a semi-online measuring device for a high-speed permanent magnet motor rotor sleeve stress, wherein a high-speed permanent magnet motor is connected to and drives an inertia disk in a temperature box, a sensor is laid on an intermediate roller of the inertia disk and wiring is carried out in a reserved channel connected thereto, a rotor sleeve to be tested that matches the intermediate roller is prepared by high-tension winding, a dynamic balancing test is carried out on the prepared rotor sleeve to be tested and the inertia disk as a whole, a sensor lead wire is passed through the reserved channel and constrained in a wire arrangement groove of a gasket, and a slip ring lead wire is connected to the outside, during the test, the temperature box is adjusted to a suitable temperature according to a target motor air gap temperature field, the rotation speed is gradually increased to a target rotation speed, and a performance test of the rotor sleeve to be tested is carried out.

[0017] The invention discloses a semi-online measuring device and method for the stress of a rotor sheath of a high-speed permanent magnet motor. The shaft extension end is extended into a temperature box to connect and rotate the inertia disk, and a sensor is set to detect the radial stress of the inner layer, so that the stress of the rotor sheath in the actual working state can be directly measured while simulating the high-speed working condition, thereby improving the accuracy and reliability of the test. The inertia disk structure design provides a stable support for the rotor sheath, and at the same time makes the installation and connection of the sensor and the slip ring induction more convenient, and also facilitates the axial limit of the sheath. The design of the groove on the inertia disk can better fix the rotor sheath to be measured, ensuring that it will not shift when rotating at high speed, and at the same time facilitates the installation and maintenance of the sensor. The design of the embedded groove and the outlet wire trough makes the installation of the sensor and the arrangement of the signal line more neat and orderly, reduces signal interference, and improves the reliability of the system. The symmetrical setting of multiple sets of embedded grooves improves the balance of the system, and the connection design of the embedded groove and the outlet wire trough simplifies the lead-out process of the signal line and improves the transmission efficiency of the signal. The setting of the gasket and the gasket hole allows the position of the contact terminal to be adjusted, which increases the adaptability of the system and also provides a guarantee for the stable transmission of the signal. The design of the locking nut ensures the stability and safety of the system, while the wire management slot facilitates the adjustment of the wiring position between the contact terminal and the slip ring induction device. The removable side panel makes it easier to maintain and replace the test piece, while the mounting base of the slip ring induction device provides support for the stable installation of the induction device. At the same time, the description of the entire test method clarifies a series of steps from equipment preparation to test execution, ensuring the standardization of the test process and the accuracy of the test results. The dynamic balancing test ensures the stability of the test piece when it rotates at high speed, and the test process of gradually increasing the speed to the target speed can simulate the actual motor working conditions and ensure the validity of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0019] Figure 2 It is a schematic diagram of the disassembled structure of the inertia disk of the present invention.

[0020] Figure 3 It is a schematic end view of the ring sleeve 2 of the present invention.

[0021] Figure 4 It is a schematic diagram of the overall structure of the inertia disk of the present invention.

[0022] Figure 5 It is a schematic diagram of the disassembled structure of the temperature box of the present invention.

[0023] Figure 6 It is a structural diagram of embodiment 2 of the present invention.

[0024] Figure 7The cross-sectional structure of the second embodiment of the present invention is shown in FIG. Figure 1 .

[0025] Figure 8 The cross-sectional structure of the second embodiment of the present invention is shown in FIG. Figure 2 .

[0026] Fig. 9 It is a schematic structural diagram of the gasket of the present invention.

[0027] In the figure: 1. high-speed permanent magnet motor; 2. inertia disk; 3. temperature box; 4. sensor; 5. slip ring induction; 6. gasket; 7. groove; 8. locking nut; 21. ring sleeve 1; 22. intermediate roller; 23. ring sleeve 2; 31. removable side panel; 32. mounting seat; 221. embedded groove; 231. outlet wire duct; 232. end hole channel; 61. gasket hole; 62. wire management duct. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Embodiment 1;

[0030] like Figure 1 and Figure 6 A semi-online measuring device for the rotor sheath stress of a high-speed permanent magnet motor 1 is shown. The high-speed permanent magnet motor 1 is used to simulate high-speed working conditions. The maximum speed of the high-speed permanent magnet motor 1 needs to be greater than 40,000 r / min, and the speed regulation range is 20,000 r / min-40,000 r / min. Note that air suspension motors and magnetic suspension motors cannot be used. Structurally, the shaft extension end of the high-speed permanent magnet motor 1 extends into the temperature box 3 to connect and rotate the inertia disk 2. Therefore, the shaft extension end has a certain length to facilitate the extension into the temperature box 3, and is used to install the inertia disk 2 in the axial direction. A sensor 4 is set on the circumferential side wall of the inertia disk 2 to detect the inner radial stress of the rotor sheath to be measured in contact with it. The sensor 4 leads out the contact terminal from the end face of the inertia disk 2, and the contact terminal is slidably connected to the slip ring induction device 5 installed on the temperature box 3 to collect the detection signal of the sensor 4 for semi-online measurement.

[0031] Among them, the rotor sleeve to be tested uses a special sleeve as a test piece, and its basic size is determined according to the following principles: the speed of the tested motor or the target motor is within the working parameter range of the high-speed permanent magnet motor of this device, and the basic size of the special test sample is consistent with the target motor rotor, and the axial length is shortened; when it exceeds the speed regulation range of the high-speed permanent magnet motor 1, the radial size of the special test sample is increased to meet the centrifugal force requirements of the special sleeve surface at the current speed, and the axial length is shortened. The process / material of the test piece is consistent with the rotor sleeve of the motor to be tested. The axial shortening size is determined according to the following principles: the permanent magnet of the rotor of the motor to be tested is not divided in the axial direction, and is not less than 20% of the original rotor sleeve length; the permanent magnet is divided in the axial direction, and is not less than the axial length of a single magnet. The special sleeve is made of carbon fiber composite material wound on the inertia disk with high tension.

[0032] like Figure 2 As shown, specifically, the inertia disk includes a ring sleeve 1 21, an intermediate roller 22 and a ring sleeve 23. The ring sleeve 1 21 and the ring sleeve 23 are correspondingly nested and fixed at both ends of the intermediate roller 22. The sides of the ring sleeve 1 21 and the ring sleeve 23 are provided with mounting holes, which can be fixed to the intermediate roller 22 by screws in the mounting holes. The centers of the ring sleeve 1 21, the intermediate roller 22 and the ring sleeve 23 are provided with a plurality of holes for fixing the intermediate roller 22. Figure 1 The shaft extension end of the high-speed permanent magnet motor 1 shown is extended into the temperature box 3 to connect and rotate the through hole of the inertia disk 2, and is used to be integrally connected to the shaft extension end of the high-speed permanent magnet motor 1. The inertia disk 2 can be fixed by matching the step and locking nut set at the shaft extension end. Of course, it can also be fixed by other methods such as interference fit and key fit.

[0033] like Figure 4 As shown, in this embodiment, the radial widths of the ring sleeve 1 21 and the ring sleeve 23 are greater than the radial width of the intermediate roller 22. The ring sleeve 1 21, the ring sleeve 23 and the circumferential side wall of the intermediate roller 22 together form a groove 7 that contacts the rotor sleeve to be measured. The groove 7 can limit the rotor sleeve to be measured in the axial direction. In other embodiments, the radial widths of the ring sleeve 1 21 and the ring sleeve 23 may not be limited. In theory, it is sufficient to fix the rotor sleeve to be measured. The circumferential side wall of the intermediate roller 22 is provided with an embedding groove 221 for installing the sensor 4. The sensor 4 adopts a passive film pressure sensor and can be matched and embedded in the embedding groove 221. The side of the inertia disk 2 leading out the contact terminal, that is, the end face of the ring sleeve 23 is provided with an outlet wire groove 231, and the outlet wire groove 231 is connected to the embedding groove 221. At the same time, in this embodiment, there are four groups of embedded grooves 221 and they are symmetrically arranged along the axial center of the intermediate roller 22. In other embodiments, there may be six groups of embedded grooves 221 or other numbers of groups symmetrically arranged along the center on the circumferential side wall of the intermediate roller 22.

[0034] like Figure 3As shown, specifically, an end hole channel 232 is pierced on the end face of the opening of the embedding groove corresponding to the ring sleeve 23, and the outlet wire groove 231 is connected to the embedding groove 221 through the end hole channel 232. Therefore, the sensor 4 is sequentially arranged in the passage connected by the embedding groove 221, the end hole channel 232, and the outlet wire groove 231, and is led outwardly through the outlet wire groove 231 to connect to the slip ring inductor 5, and is sent to the peripheral signal acquisition and processing equipment through the slip ring inductor 5.

[0035] like Figure 5 As shown, the temperature box 3 has a detachable side panel 31, and a mounting seat 32 is provided on the detachable side panel 31. The slip ring inductor 5 is embedded in the mounting seat 32. It should be understood that the temperature box 3 is a heating device that creates the temperature condition of the rotor sheath of the high-speed permanent magnet motor 1 during service. It usually has a heating device and a temperature control system inside. Of course, any heating method that can theoretically achieve the internal heating effect of the temperature box 3 can also be used. At the same time, the outer layer of the box is made of steel with a large thickness, so it can also play a role in protecting high-speed components from accidental damage and ejection. Specifically, the side of the temperature box 3 is determined according to the following principles: the high-speed motor shaft extension part has a hole, the fixed part of the slip ring inductor 5 is installed on the side of the temperature box 3, the size of the temperature box 3 in the shaft extension direction is kept compact, and the slip ring inductor 5 is as close to the inertia disk 2 as possible to reduce the length of the signal transmission line. In order to facilitate the subsequent installation of the equipment, the end panel of the temperature box 3 close to the slip ring inductor 5 is detachable. A mounting frame is provided at the bottom of the box body to ensure the center height of the side opening, and to share the base installation with the high-speed drag motor to ensure the coaxiality of the mounting hole position of the detachable panel side slip ring lead 5 and the motor shaft extension.

[0036] Embodiment 2:

[0037] like Figure 6 and Figure 7 The semi-online measuring device for the rotor sheath stress of a high-speed permanent magnet motor 1 is shown. The high-speed permanent magnet motor 1 is used to simulate high-speed working conditions. In terms of structure, the shaft extension end of the high-speed permanent magnet motor 1 is inserted into the temperature box 3 to connect and rotate the inertia disk 2. Therefore, the shaft extension end has a certain length to facilitate insertion into the temperature box 3. The inertia disk 2 is installed in the axial direction. A sensor 4 is arranged on the circumferential side wall of the inertia disk 2 to detect the inner radial stress of the rotor sheath to be measured in contact with it. The sensor 4 leads out a contact terminal from the end face of the inertia disk 2. The contact terminal is slidably connected to the slip ring energizer 5 installed on the temperature box 3 to collect the detection signal of the sensor 4 for semi-online measurement. On the basis of the first embodiment, a gasket 6 is arranged on the shaft extension end of the high-speed permanent magnet motor 1 close to the contact terminal side. A locking nut 8 is spirally connected to the shaft extension end of the high-speed permanent magnet motor 1. The locking nut 8 is locked on the side of the gasket 6 close to the slip ring energizer 5. The locking nut 8 is also inserted into the inner hole of the slip ring energizer 5.

[0038] like Figure 2As shown, specifically, the inertia disk includes a ring sleeve 1 21, an intermediate roller 22 and a ring sleeve 23. The ring sleeve 1 21 and the ring sleeve 23 are correspondingly nested and fixed at both ends of the intermediate roller 22. The sides of the ring sleeve 1 21 and the ring sleeve 23 are provided with mounting holes, which can be fixed to the intermediate roller 22 by screws in the mounting holes. The centers of the ring sleeve 1 21, the intermediate roller 22 and the ring sleeve 23 are provided with a plurality of holes for fixing the intermediate roller 22. Figure 6 The shaft extension end of the high-speed permanent magnet motor 1 shown is extended into the temperature box 3 to connect and rotate the through hole of the inertia disk 2, and is used to be integrally connected to the shaft extension end of the high-speed permanent magnet motor 1. The inertia disk 2 can be fixed by matching the step and the locking nut set at the shaft extension end. In this embodiment, the radial widths of the ring sleeve 1 21 and the ring sleeve 2 23 are both greater than the radial width of the intermediate roller 22. The ring sleeve 1 21, the ring sleeve 23 and the circumferential side wall of the intermediate roller 22 together form a groove 7 that contacts the rotor sleeve to be tested, and the groove 7 can limit the rotor sleeve to be tested in the axial direction.

[0039] like Figure 3 As shown, a groove 221 for installing a sensor is provided on the circumferential side wall of the intermediate roller 22. The sensor 4 adopts a passive thin film pressure sensor, which can be matched and embedded in the groove 221. A wire outlet groove 231 is provided on one side of the lead-out contact terminal of the inertia disk 2, that is, on the end face of the ring sleeve 23. The wire outlet groove 231 is connected to the groove 221.

[0040] like Figure 4 As shown, specifically, an end surface of the opening of the embedding groove 221 corresponding to the ring sleeve 23 is provided with an end surface hole 232. Figure 8 As shown, the outlet wire groove 231 is connected to the embedded groove 221 through the end hole channel 232, so the sensor 4 is sequentially arranged in the passage connected by the embedded groove 221, the end hole channel 232, and the outlet wire groove 231, and is led outward through the outlet wire groove 231 to connect the slip ring inductor 5, and is sent to the peripheral signal acquisition and processing equipment through the slip ring inductor 5.

[0041] Meanwhile, in this embodiment, there are four groups of embedded grooves 221 and they are symmetrically arranged along the axial center of the intermediate roller 22. Figure 5 and Figure 7As shown, the temperature box 3 has a detachable side panel 31, and a mounting seat 32 is provided on the detachable side panel 31. The slip ring inductor 5 is embedded in the mounting seat 32. It should be understood that the temperature box 3 is a heating device that creates the temperature condition of the rotor sheath of the high-speed permanent magnet motor 1 during service. It usually has a heating device and a temperature control system inside. Of course, any heating method that can theoretically achieve the internal heating effect of the temperature box 3 can also be used. At the same time, the outer layer of the box is made of steel with a large thickness, so it can also play a role in protecting high-speed components from accidental damage and ejection. Specifically, the side of the temperature box 3 is determined according to the following principles: the high-speed motor shaft extension part has a hole, the fixed part of the slip ring inductor 5 is installed on the side of the temperature box 3, the size of the temperature box 3 in the shaft extension direction is kept compact, and the slip ring inductor 5 is as close to the inertia disk 2 as possible to reduce the length of the signal transmission line. In order to facilitate the subsequent installation of the equipment, the end panel of the temperature box 3 close to the slip ring inductor 5 is detachable. A mounting frame is provided at the bottom of the box body to ensure the center height of the side opening, and to share the base installation with the high-speed drag motor to ensure the coaxiality of the mounting hole position of the detachable panel side slip ring lead 5 and the motor shaft extension.

[0042] like Figure 8 and Fig. 9 As shown, the gasket 6 is provided with a gasket channel 61 for inserting the contact terminal. The gasket 6 is provided with a circle of wire management grooves 62 on the side close to the slip ring induction device 5. The wire management grooves 62 are connected to the gasket channel 61. The wire management grooves 62 are located at the periphery of the fitting surface formed after the gasket 6 and the locking nut 8 are locked. In this way, the gasket 6 is tightly connected to one side of the ring sleeve 23, and the contact terminal enters the wire management grooves 62 through the gasket channel 61. The wire management grooves 62 can dynamically adjust the outlet position and the outlet length of the contact terminal, so as to facilitate the adjustment of the wiring position of the contact terminal and the slip ring induction device 5. At the same time, the gasket 6 can also adapt to the axial size changes of the inertia disc 2 under different conditions, and at the same time increase the axial clamping area of ​​the inertia disc 2, so as to adapt to the rotor sheaths of different sizes to be tested.

[0043] In summary, before using this device, the basic dimensions of the special test sample are determined according to the above principles, and the corresponding inertia disk 2 is processed, the sensor 4 is laid on the intermediate roller 22 and wired in the channel, and the corresponding rotor sleeve to be tested is prepared by high tension winding. After preparation, the rotor sleeve to be tested and the inertia disk 2 are subjected to a dynamic balancing test as a whole to achieve the corresponding balancing accuracy level. The dynamic balancing test is carried out by removing material from the sleeve ring. Before the test, the various components are installed. First, the side panel of the temperature box 3 is removed, and the slip ring inductor 5 fixture is installed on it. The inertia disk 2 is pushed in from the end of the shaft extension and the gasket 6 is installed, and the locking nut 8 is tightened. The tightening and removal of the locking nut 8 can be carried out by pulling the contact point of the shaft end to ensure the locking force. Pass the lead wire of sensor 4 through the gasket hole 61 of gasket 6, and constrain it in the wire management groove 62 of gasket 6, install the removable panel of the box, make the outer surface of the locking nut 8 pass through the inner hole of the slip ring induction device 5, comb the wire to cut off the excess part, and connect the slip ring induction device 5. Lock the inner hole of the slip ring induction device 5 to the locking nut 8. The data acquisition and analysis equipment at the back end of sensor 4 is connected to the fixed part of the slip ring induction device 5. During the test, after adjusting the temperature box 3 to the appropriate temperature according to the target motor air gap temperature field, the speed is gradually increased to the target speed to ensure that the operation of each part of the device and the signal transmission are stable, and the semi-online performance test of the rotor sleeve to be tested can be carried out.

[0044] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A semi-online measurement device for high-speed permanent magnet motor rotor sheath stress, characterized in that: The shaft extension end of the high-speed permanent magnet motor is extended into the temperature box to connect and rotate the inertia disk. A sensor is arranged on the circumferential side wall of the inertia disk to detect the inner radial stress of the rotor sleeve to be tested in contact with it. The sensor leads out a contact terminal from the end face of the inertia disk. The contact terminal is slidably connected to the slip ring induction device installed on the temperature box to collect the sensor detection signal for semi-online measurement.

2. The semi-online measurement device for high-speed permanent magnet motor rotor sheath stress according to claim 1 is characterized in that: The inertia disk includes a ring sleeve 1, an intermediate roller and a ring sleeve 2. The ring sleeve 1 and the ring sleeve 2 are correspondingly nested and fixed at the two ends of the intermediate roller. The centers of the ring sleeve 1, the intermediate roller and the ring sleeve 2 are jointly provided with a through hole for the shaft extension end of the high-speed permanent magnet motor to extend into the temperature box to connect and rotate the inertia disk.

3. The semi-online measuring device for high-speed permanent magnet motor rotor sheath stress according to claim 2 is characterized in that: The radial widths of the first and second ring sleeves are both greater than the radial width of the middle roller, and the first and second ring sleeves and the circumferential side wall of the middle roller together form a groove that contacts the rotor sleeve to be tested.

4. The semi-online measurement device for high-speed permanent magnet motor rotor sheath stress according to claim 2 is characterized in that: An embedding groove for installing a sensor is arranged on the circumferential side wall of the intermediate roller, and an outlet wire groove is arranged on the end surface of the inertia disk on the side where the contact terminal is led out, and the outlet wire groove is connected to the embedding groove.

5. The semi-online measuring device for high-speed permanent magnet motor rotor sheath stress according to claim 4 is characterized in that: There are multiple groups of embedding grooves which are symmetrically arranged along the axial center of the middle roller. An end face hole channel is pierced on the end face of the opening of the embedding groove corresponding to the second ring sleeve, and the outlet wire groove is connected to the embedding groove through the end face hole channel.

6. The semi-online measuring device for high-speed permanent magnet motor rotor sheath stress according to claim 5 is characterized in that: A gasket is arranged on the shaft extension end of the high-speed permanent magnet motor close to the contact terminal, and a gasket hole for passing the contact terminal is opened on the gasket.

7. The semi-online measuring device for high-speed permanent magnet motor rotor sheath stress according to claim 6 is characterized in that: A locking nut is spirally connected to the shaft extension end of the high-speed permanent magnet motor, and the locking nut is locked on the side of the gasket close to the slip ring fuse. The locking nut is also inserted into the inner hole of the slip ring fuse.

8. The semi-online measuring device for high-speed permanent magnet motor rotor sheath stress according to claim 6 is characterized in that: The gasket is provided with a circle of wire management grooves on one side close to the slip ring inductor, the wire management grooves are connected to the gasket hole, and the wire management grooves are located at the periphery of the fitting surface formed after the gasket and the locking nut are locked.

9. The semi-online measuring device for high-speed permanent magnet motor rotor sheath stress according to claim 6, characterized in that: The temperature box is provided with a detachable side plate, the detachable side plate is provided with a mounting seat, and the slip ring inductor is embedded in the mounting seat.

10. A test method for a semi-online measurement device for a high-speed permanent magnet motor rotor sheath stress, characterized in that: The invention comprises a semi-online stress measuring device for a rotor sleeve of a high-speed permanent magnet motor as described in any one of claims 1 to 9, wherein an inertia disk is connected and driven by a high-speed permanent magnet motor in the temperature box, a sensor is laid on the middle roller of the inertia disk and wiring is carried out in a reserved channel connected thereto, a rotor sleeve to be tested that matches the middle roller is prepared by high-tension winding, a dynamic balancing test is carried out on the prepared rotor sleeve to be tested and the inertia disk as a whole, a sensor lead wire is passed through the reserved channel and constrained in a wire management groove of a gasket, and a slip ring induction device is connected to the outside, during the test, the temperature box is adjusted to a suitable temperature according to the target motor air gap temperature field, the rotation speed is gradually increased to the target rotation speed, and a performance test of the rotor sleeve to be tested is carried out.

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