A semi-online measuring device and method for the stress of the rotor sheath of a high-speed permanent magnet motor

Abstract

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 of the high-speed permanent magnet motor extends into a temperature chamber to connect and rotate an inertia disc. A sensor is arranged on the circumferential side wall of the inertia disc to detect the inner radial stress of the rotor sheath to be measured in contact therewith. The sensor leads out a contact terminal from the end face of the inertia disc, and the contact terminal is slidably connected to a slip ring electrical collector installed on the temperature chamber to collect the detection signal of the sensor for semi-online measurement. The device and method can simulate the actual working conditions of the rotor sheath of the high-speed permanent magnet motor, realize stress monitoring by setting the sensor and the slip ring electrical collector, and ensure the accuracy and effectiveness of the test results through the dynamic balance test and the test process of gradually increasing the speed.

Description

Technical Field

[0001] The present invention relates to a semi - on - line measurement device and method, and particularly to a semi - on - line measurement device and method for the stress of the rotor sheath of a high - speed permanent magnet motor. Background Art

[0002] In high - speed permanent magnet motors, since sintered neodymium - iron - boron permanent magnet materials are used, although such materials have relatively high compressive strength, their tensile strength is relatively low. When the motor runs at high speed, the permanent magnets need to bear huge centrifugal forces, which are difficult for the permanent magnets themselves to withstand. Therefore, in order to protect the permanent magnets and ensure the stable operation of the motor, a rotor sheath must be used. In fields such as compressors, flywheel energy storage, motor spindles, high - speed machine tools, and new energy vehicles, fiber - reinforced composite rotor sheaths are increasingly widely used in high - speed permanent magnet motors.

[0003] High - speed permanent magnet motors are widely used in fields such as compressors, flywheel energy storage, motor spindles, high - speed machine tools, and new energy vehicles. Their rotor sheaths usually adopt fiber - reinforced composites, especially carbon fiber composites, to protect the permanent magnets from the huge centrifugal forces generated by high - speed rotation. Although the reliability of the current carbon fiber composite sheaths mainly depends on the initial stress design and temporarily meets the basic requirements of engineering applications, there is still a lack of long - term operation measured data.

[0004] In fact, fiber - reinforced composite sheaths operate in a multi - physical - field environment of complex centrifugal forces, stress concentration, and rotor temperature fields. Their long - term mechanical properties will be significantly affected by the force - heat coupling environment, which may lead to phenomena such as creep and stress relaxation, thereby reducing the internal stress, affecting the protection effect of the sheath on the permanent magnets, and further affecting the overall performance and reliability of the motor. Since it is very difficult to on - line detect the inner - layer stress of the sheath in a high - speed rotating motor, facing a series of challenges such as sensor arrangement, signal transmission, rotor dynamic balance, and interference with rotor dynamics design, there is a lack of experimental verification means for the applicability and reliability of the initial design parameters. Therefore, semi - on - line service performance testing that simulates the actual operating environment of the composite sheath becomes crucial. By evaluating the reliability of the sheath material, structure, and process under conditions close to the actual working conditions, monitoring the performance of the sheath under different working conditions, it can provide an important basis for the design and optimization of high - speed motors. Such testing not only helps to extend the service life of the motor, but also improves its operating efficiency, ensuring the stability and reliability of the motor during long - term operation.

[0005] At present, there are no relevant patents on the test devices and methods for the service performance of the carbon fiber maintenance sleeve of the high-speed motor rotor. There is an urgent need for new technologies to fill this gap, focusing on the measurement of the inner layer stress provided by the rotor sheath during the dynamic operation of the motor, analyzing the characteristics of the sheath during the dynamic operation, providing a scientific basis for optimizing the sheath winding process, and improving the reliability of the sheath in practical applications. Summary of the Invention

[0006] In order to solve the deficiencies of the above technologies, the present invention provides a semi-online measurement device and method for the stress of the rotor sheath 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 stress of the rotor sheath of a high-speed permanent magnet motor. The shaft extension end of the high-speed permanent magnet motor extends into the temperature chamber and is connected to and rotates the inertia disk. A sensor is arranged on the circumferential side wall of the inertia disk to detect the inner layer 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 electrical connector installed on the temperature chamber to collect the detection signal of the sensor for semi-online measurement.

[0008] Further, the inertia disk includes a first ring sleeve, an intermediate roller, and a second ring sleeve. The first ring sleeve and the second ring sleeve are correspondingly nested and fixed at both ends of the intermediate roller. A through hole is commonly opened at the centers of the first ring sleeve, the intermediate roller, and the second ring sleeve for the shaft extension end of the high-speed permanent magnet motor to extend into the temperature chamber and be connected to and rotate the inertia disk.

[0009] Further, the radial widths of the first ring sleeve and the second ring sleeve are both greater than the radial width of the intermediate roller. A groove for contacting the rotor sheath to be measured is jointly formed between the circumferential side walls of the first ring sleeve, the second ring sleeve, and the intermediate roller.

[0010] Further, an embedding groove for installing the sensor is arranged on the circumferential side wall of the intermediate roller, and a wire outlet groove is arranged on the end face of the inertia disk on the side where the contact terminal is led out. The wire outlet groove communicates with the embedding groove.

[0011] Further, there are multiple groups of embedding grooves, which are symmetrically arranged along the axial center of the intermediate roller. End face holes are penetrated through the end faces at the openings of the embedding grooves corresponding to the second ring sleeve. The wire outlet groove communicates with the embedding groove through the end face holes.

[0012] Further, 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 through the contact terminal is opened on the gasket.

[0013] Further, a locking nut is screwed on 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 electrical connector, and the locking nut also passes through the inner hole of the slip ring electrical connector.

[0014] Further, a wire arranging groove is formed on one side of the gasket close to the slip ring current collector. The wire arranging groove communicates with the gasket hole, and the wire arranging groove is located on the periphery of the joint surface formed after the gasket and the locking nut are locked.

[0015] Further, the temperature chamber is provided with a detachable side plate, and an installation seat is arranged on the detachable side plate. The slip ring current collector is embedded in the installation seat.

[0016] A test method for a semi-online measuring device of the stress of a high-speed permanent magnet motor rotor sheath includes the semi-online measuring device of the stress of the high-speed permanent magnet motor rotor sheath. The high-speed permanent magnet motor is used to connect and drive an inertia disk in the temperature chamber. A sensor is laid on the middle roller of the inertia disk and wired in a reserved hole communicating therewith. A rotor sheath to be measured matching the middle roller is prepared by winding with a large tension. After the preparation is completed, the whole of the rotor sheath to be measured and the inertia disk is subjected to a dynamic balance test. The lead wire of the sensor is led out through the reserved hole and constrained in the wire arranging groove of the gasket, and is externally connected to the slip ring current collector. During the test, after the temperature of the temperature chamber is adjusted to a suitable temperature according to the air gap temperature field of the target motor, the rotational speed is gradually increased to the target rotational speed, and the performance test of the rotor sheath to be measured is carried out.

[0017] The present invention discloses a semi-online measuring device and method for the stress of a rotor sheath of a high-speed permanent magnet motor. By extending into the temperature chamber through the shaft extension end to connect and rotate the inertia disk, sensors are set to detect the inner radial stress, enabling direct measurement of the stress of the rotor sheath under actual working conditions while simulating high-speed operating conditions, thereby improving the accuracy and reliability of the test. The design of the inertia disk structure provides stable support for the rotor sheath, and at the same time makes the installation and connection of the sensors and slip ring electrical connectors more convenient, and also facilitates the axial limit of the sheath. The design of the grooves on the inertia disk can better fix the rotor sheath to be measured, ensuring that it will not shift during high-speed rotation, and at the same time facilitating the installation and maintenance of the sensors. The design of the embedding grooves and wire outlet grooves makes the installation of the sensors and the layout of the signal lines more neat and orderly, reducing signal interference and improving the reliability of the system. The symmetric setting of multiple groups of embedding grooves improves the balance of the system, and the connected design of the embedding grooves and the wire outlet grooves simplifies the process of leading out the signal lines and improves the signal transmission efficiency. The setting of the gasket and gasket hole allows the position of the contact terminal to be adjusted, increasing the adaptability of the system and at the same time providing guarantee for the stable transmission of signals. The design of the locking nut ensures the stability and safety of the system, and the wire management groove facilitates the adjustment of the wiring position of the contact terminal and the slip ring electrical connector; the detachable side plate makes the maintenance and replacement of the test piece of the equipment more convenient, and the mounting seat of the slip ring electrical connector provides support for the stable installation of the electrical connector. 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 balance test ensures the stability of the test piece during high-speed rotation, and the test process of gradually increasing the rotational speed to the target speed can simulate the real working conditions of the motor, ensuring the effectiveness of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

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

[0020] Figure 3 FIG. 3 is a schematic end face diagram of the second ring sleeve of the present invention.

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

[0022] Figure 5 FIG. 5 is a schematic disassembled structural diagram of the temperature chamber of the present invention.

[0023] Figure 6 FIG. 6 is a schematic structural diagram of Embodiment 2 of the present invention.

[0024] Figure 7Schematic cross-sectional structure of Embodiment 2 of the present invention Figure 1 。

[0025] Figure 8 Schematic cross-sectional structure of Embodiment 2 of the present invention Figure 2 。

[0026] Figure 9 Schematic structure 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 electrical connector; 6, gasket; 7, groove; 8, lock nut; 21, first ring sleeve; 22, intermediate roller; 23, second ring sleeve; 31, detachable side plate; 32, mounting seat; 221, embedding groove; 231, wire outlet groove; 232, end face duct; 61, gasket duct; 62, wire management groove. Specific embodiments

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

[0029] Embodiment 1;

[0030] As Figure 1 and Figure 6 shown, a semi-online measurement device for the stress of the rotor sheath of a high-speed permanent magnet motor 1 adopts the high-speed permanent magnet motor 1 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 and is connected to and rotates the inertia disk 2. Therefore, this shaft extension end has a certain length to facilitate extending into the temperature box 3 for axially installing the inertia disk 2. A sensor 4 is arranged on the circumferential side wall of the inertia disk 2 to detect the inner layer radial stress of the rotor sheath to be measured in contact with it. The sensor 4 leads out contact terminals from the end face of the inertia disk 2, and the contact terminals are slidably connected to the slip ring electrical connector 5 installed on the temperature box 3 to collect the detection signals of the sensor 4 for semi-online measurement.

[0031] Among them, the rotor sheath to be measured uses a special sheath as the test piece, and its basic dimensions are determined according to the following principles: when the rotational speed of the motor to be measured or the target motor is within the operating parameter range of the high-speed permanent magnet motor of this device, the basic dimensions of the special test sample are the same as those of 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 dimension of the special test sample is increased to meet the centrifugal force requirement on the surface of the special sheath at the current rotational speed, and the axial length is shortened. The process / material, etc. of the test piece are the same as those of the rotor sheath of the motor to be measured. The axial shortening dimension is determined according to the following principles: when the permanent magnets of the rotor of the motor to be measured are not axially segmented, it is not less than 20% of the original rotor sheath length; when the permanent magnets are axially segmented, it is not less than the axial length of a single magnet. The special sheath is made of carbon fiber composite material by winding it on the inertia disk with large tension.

[0032] As Figure 2 shown, specifically, the inertia disk includes a first ring sleeve 21, an intermediate roller 22, and a second ring sleeve 23. The first ring sleeve 21 and the second ring sleeve 23 are correspondingly nested and fixed at both ends of the intermediate roller 22. Mounting hole positions are provided on the side surfaces of the first ring sleeve 21 and the second ring sleeve 23, and they can be fixed to the intermediate roller 22 through screws in the mounting hole positions. A through hole for the shaft extension end of the high-speed permanent magnet motor 1 as Figure 1 shown is jointly opened at the centers of the first ring sleeve 21, the intermediate roller 22, and the second ring sleeve 23 for the shaft extension end of the high-speed permanent magnet motor 1 to extend into the temperature box 3 to be connected and rotate the inertia disk 2. It is used for integrally connecting to the shaft extension end of the high-speed permanent magnet motor 1. The inertia disk 2 can be fixedly matched through the steps and locking nuts provided at the shaft extension end. Of course, other methods such as interference fit and key fit can also be used for fixation.

[0033] As Figure 4 shown, in this embodiment, the radial widths of the first ring sleeve 21 and the second ring sleeve 23 are both greater than the radial width of the intermediate roller 22. A groove 7 for contacting the rotor sheath to be measured is jointly formed between the circumferential side walls of the first ring sleeve 21, the second ring sleeve 23, and the intermediate roller 22. The groove 7 can axially limit the rotor sheath to be measured. In other embodiments, the radial widths of the first ring sleeve 21 and the second ring sleeve 23 may not be limited, and theoretically, as long as the fixation of the rotor sheath to be measured can be achieved. An embedding groove 221 for installing the sensor 4 is provided on the circumferential side wall of the intermediate roller 22. The sensor 4 uses a passive thin-film pressure sensor and can be fitted in the embedding groove 221. On the side where the inertia disk 2 leads out the contact terminals, that is, on the end surface of the second ring sleeve 23, a wire outlet groove 231 is provided, and the wire outlet groove 231 communicates with the embedding groove 221. At the same time, in this embodiment, there are four groups of embedding 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 embedding grooves 221 or other numbers of groups symmetrically arranged along the circumferential side wall of the intermediate roller 22.

[0034] As Figure 3As shown, specifically, an end face hole 232 is provided on the end face at the opening of the corresponding groove of the second loop 23. The wire outlet groove 231 communicates with the groove 221 through the end face hole 232. Therefore, the sensor 4 is arranged in the path communicated by the groove 221, the end face hole 232, and the wire outlet groove 231 in sequence, and is led out through the wire outlet groove 231 to connect to the slip ring electrical connector 5, and is sent to the peripheral signal acquisition and processing device through the slip ring electrical connector 5.

[0035] As Figure 5 shown, the temperature chamber 3 has a detachable side plate 31. An installation seat 32 is provided on the detachable side plate 31. The slip ring electrical connector 5 is embedded in the installation seat 32. It should be understood that the temperature chamber 3 is a heating device that creates the temperature condition during the service process of the rotor sheath of the high-speed permanent magnet motor 1. It usually has a heating device and a temperature control system inside. Of course, any heating method that can theoretically achieve the heating effect inside the temperature chamber 3 can be used. At the same time, the outer layer of the chamber is made of steel with a relatively large thickness, so it can also play a role in protecting against accidental damage and ejection of high-speed components. Specifically, the side of the temperature chamber 3 is determined according to the following principle: an opening is made in the shaft extension part of the high-speed motor, the fixed part of the slip ring electrical connector 5 is installed on the side of the temperature chamber 3, the dimension of the temperature chamber 3 in the shaft extension direction is kept compact, and at the same time, the slip ring electrical connector 5 is made as close as possible to the inertia disk 2 to reduce the length of the signal transmission line. For the convenience of subsequent installation of the equipment, the end panel of the temperature chamber 3 near the slip ring electrical connector 5 is detachable. An installation frame is provided at the bottom of the chamber to ensure the center height of the side opening, and it is installed on the common base with the high-speed driving motor to ensure the coaxiality of the installation hole position of the slip ring electrical connector 5 on the detachable panel side and the motor shaft extension.

[0036] Embodiment 2;

[0037] As Figure 6 and Figure 7 shown, a semi-online measuring device for the stress of the rotor sheath of a high-speed permanent magnet motor 1 uses the high-speed permanent magnet motor 1 to simulate high-speed conditions. Structurally, the shaft extension end of the high-speed permanent magnet motor 1 extends into the temperature chamber 3 to connect and rotate the inertia disk 2. Therefore, this shaft extension end has a certain length to facilitate extending into the temperature chamber 3 for axially installing the inertia disk 2. A sensor 4 is arranged on the circumferential side wall of the inertia disk 2 to detect the inner layer 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, and the contact terminal is slidably connected to the slip ring electrical connector 5 installed on the temperature chamber 3 to collect the detection signal of the sensor 4 for semi-online measurement. On the basis of Embodiment 1, a gasket 6 is provided on the shaft extension end of the high-speed permanent magnet motor 1 near the contact terminal. A locking nut 8 is screwed on the shaft extension end of the high-speed permanent magnet motor 1, and the locking nut 8 is locked on the side of the gasket 6 close to the slip ring electrical connector 5. The locking nut 8 also passes through the inner hole of the slip ring electrical connector 5.

[0038] As Figure 2As shown, specifically, the inertia disk includes a first collar 21, an intermediate roller 22, and a second collar 23. The first collar 21 and the second collar 23 are correspondingly nested and fixed at both ends of the intermediate roller 22. Mounting hole positions are provided on the side surfaces of the first collar 21 and the second collar 23, and they can be fixed to the intermediate roller 22 through screws in the mounting hole positions. A through hole is commonly opened at the centers of the first collar 21, the intermediate roller 22, and the second collar 23 for the shaft extension end of the high-speed permanent magnet motor 1 as shown in Figure 6 to extend into the temperature chamber 3 for connection and rotation of the inertia disk 2. It is used for integrally connecting to the shaft extension end of the high-speed permanent magnet motor 1, and the inertia disk 2 can be fixedly matched through a step and a locking nut provided at the shaft extension end. In this embodiment, the radial widths of the first collar 21 and the second collar 23 are both greater than the radial width of the intermediate roller 22. A groove 7 for contacting the sheath of the rotor under test is jointly formed between the circumferential side walls of the first collar 21, the second collar 23, and the intermediate roller 22. The groove 7 can axially limit the sheath of the rotor under test.

[0039] As Figure 3 shown, an embedding groove 221 for installing a sensor is provided on the circumferential side wall of the intermediate roller 22. The sensor 4 is a passive thin-film pressure sensor and can be fitted in the embedding groove 221. On the side where the inertia disk 2 leads out the contact terminal, that is, on the end face of the second collar 23, a wire outlet groove 231 is provided. The wire outlet groove 231 communicates with the embedding groove 221.

[0040] As Figure 4 shown, specifically, an end face hole passage 232 is penetrated through the end face at the opening of the embedding groove 221 corresponding to the second collar 23. As Figure 8 shown, the wire outlet groove 231 communicates with the embedding groove 221 through the end face hole passage 232. Therefore, the sensor 4 is sequentially arranged in the passage communicated by the embedding groove 221, the end face hole passage 232, and the wire outlet groove 231, and is led out through the wire outlet groove 231 to connect to the slip ring electrical connector 5, and is sent to the peripheral signal acquisition and processing equipment through the slip ring electrical connector 5.

[0041] Meanwhile, in this embodiment, there are four groups of embedding grooves 221 and they are symmetrically arranged along the axial center of the intermediate roller 22. As Figure 5 and Figure 7As shown, the temperature chamber 3 is provided with a detachable side plate 31. An installation seat 32 is arranged on the detachable side plate 31, and the slip ring electrical connector 5 is embedded in the installation seat 32. It should be understood that the temperature chamber 3 is a heating device that creates the temperature condition during the service process of the rotor sheath of the high-speed permanent magnet motor 1. It usually has a heating device and a temperature control system inside. Of course, any heating method that can theoretically achieve the heating effect inside the temperature chamber 3 can be used. At the same time, the outer layer of the chamber is made of steel with a relatively large thickness, so it can also play a role in protecting against accidental damage and ejection of high-speed components. Specifically, the side of the temperature chamber 3 is determined according to the following principle: an opening is made in the shaft extension part of the high-speed motor, the fixed part of the slip ring electrical connector 5 is installed on the side of the temperature chamber 3, the dimension of the temperature chamber 3 in the shaft extension direction is kept compact, and at the same time, the slip ring electrical connector 5 is made as close as possible to the inertia disc 2 to reduce the length of the signal transmission line. For the convenience of subsequent installation of the equipment, the end panel of the temperature chamber 3 near the slip ring electrical connector 5 is detachable. An installation frame is provided at the bottom of the chamber to ensure the center height of the side opening, and it is installed on the common base with the high-speed driving motor to ensure the coaxiality between the installation hole position of the slip ring electrical connector 5 on the detachable panel side and the motor shaft extension.

[0042] As Figure 8 and Figure 9 shown, the gasket 6 is provided with a gasket hole channel 61 for passing through the contact terminal. A wiring groove 62 is provided on one side of the gasket 6 close to the slip ring electrical connector 5. The wiring groove 62 communicates with the gasket hole channel 61, and the wiring groove 62 is located on the periphery of the mating surface formed after the gasket 6 and the lock nut 8 are tightened. In this way, the gasket 6 is tightly connected on one side of the second sleeve 23, and the contact terminal enters the wiring groove 62 through the gasket hole channel 61. The outgoing line position and length of the contact terminal can be dynamically adjusted through the wiring groove 62, which is convenient for adjusting the wiring position between the contact terminal and the slip ring electrical connector 5. At the same time, the gasket 6 can also adapt to the change of the axial dimension of the inertia disc 2 under different conditions, and at the same time increase the axial pressing area of the inertia disc 2 to adapt to rotors sheaths to be measured with different dimensions.

[0043] In summary, before using the device, determine the basic dimensions of the special test sample according to the above principles, and machine the corresponding inertia disc 2. Lay the sensor 4 on the intermediate roller 22 and route the wires in the ducts. Prepare the corresponding rotor sheath to be tested by winding with large tension. After preparation, conduct a dynamic balance test on the whole of the rotor sheath to be tested and the inertia disc 2 to reach the corresponding balance accuracy level. The dynamic balance test is carried out by removing materials from the collar. Before the test, install each component. First, remove the side panel of the temperature chamber 3 and install the holder of the slip ring electrical connector 5 on it. Push the inertia disc 2 into the shaft extension end and install the gasket 6, and tighten the lock nut 8. The tightening and removal of the lock nut 8 can be carried out by pulling the contact point at the shaft end to ensure the locking force. Thread the lead wire of the sensor 4 through the gasket hole 61 of the gasket 6 and constrain it in the wire groove 62 of the gasket 6. Install the detachable panel of the box body so that the outer surface of the lock nut 8 passes through the inner hole of the slip ring electrical connector 5, comb the wires and cut off the redundant parts, and connect the slip ring electrical connector 5. Lock the inner hole of the slip ring electrical connector 5 to the lock nut 8. Connect the data acquisition and analysis device at the rear end of the sensor 4 to the fixed part of the slip ring electrical connector 5. During the test, after adjusting the temperature chamber 3 to the appropriate temperature according to the target motor air-gap temperature field, gradually increase the speed to the target speed to ensure the smooth operation and signal transmission of each part of the device, and then the semi-online performance test of the rotor sheath to be tested can be carried out.

[0044] The above embodiments are not limitations on the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention also fall within the protection scope of the present invention.

Claims

1. A semi-online measuring device for the stress of the rotor sheath of a high-speed permanent magnet motor, characterized in that: The shaft extension end of the high-speed permanent magnet motor extends into the temperature chamber 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 therewith. The sensor leads out a contact terminal from the end face of the inertia disk, and the contact terminal is slidably connected to a slip ring electrical connector installed on the temperature chamber to collect the detection signal of the sensor for semi-online measurement; The inertia disk includes a first ring sleeve, an intermediate roller, and a second ring sleeve. The first ring sleeve and the second ring sleeve are correspondingly nested and fixed at both ends of the intermediate roller. A through hole for the shaft extension end of the high-speed permanent magnet motor to extend into the temperature chamber to connect and rotate the inertia disk is jointly opened at the centers of the first ring sleeve, the intermediate roller, and the second ring sleeve; An embedding groove for installing the sensor is arranged on the circumferential side wall of the intermediate roller. A wire outlet groove is arranged on the end face of the inertia disk on the side where the contact terminal is led out, and the wire outlet groove communicates with the embedding groove; There are multiple groups of the embedding grooves, which are symmetrically arranged along the axial center of the intermediate roller. End face channels are penetrated on the end faces at the openings of the embedding grooves corresponding to the second ring sleeve, and the wire outlet groove communicates with the embedding groove through the end face channels; A gasket is arranged on the shaft extension end of the high-speed permanent magnet motor near the contact terminal, and a gasket hole for penetrating the contact terminal is opened on the gasket; A locking nut is screwed on 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 electrical connector, and the locking nut simultaneously penetrates through the inner hole of the slip ring electrical connector; The radial widths of the first ring sleeve and the second ring sleeve are both larger than the radial width of the intermediate roller. A groove for contacting the rotor sheath to be measured is jointly formed between the circumferential side walls of the first ring sleeve, the second ring sleeve, and the intermediate roller.

2. The stress semi-online measuring device for the rotor sheath of the high-speed permanent magnet motor according to claim 1, characterized in that: A wire arranging groove is opened on the side of the gasket close to the slip ring electrical connector. The wire arranging groove communicates with the gasket hole, and the wire arranging groove is located on the periphery of the fitting surface formed after the gasket and the locking nut are locked; 3. The stress semi-online measuring device for the rotor sheath of the high-speed permanent magnet motor according to claim 2, characterized in that: The temperature chamber is provided with a detachable side plate, and an installation seat is arranged on the detachable side plate. The slip ring electrical connector is embedded in the installation seat.

4. A test method for a semi-online measuring device of the stress of the rotor sheath of a high-speed permanent magnet motor, characterized in that: It includes the semi-online measuring device for the stress of the rotor sheath of the high-speed permanent magnet motor according to any one of claims 1-3. The high-speed permanent magnet motor is used to connect and drive the inertia disk in the temperature chamber. The sensor is laid on the intermediate roller of the inertia disk and wired in the reserved hole channels communicated therewith. The rotor sheath to be measured matching the intermediate roller is prepared by large-tension winding. The whole of the prepared rotor sheath to be measured and the inertia disk is subjected to a dynamic balance test. The lead wire of the sensor is led out through the gasket hole and constrained in the wire arranging groove of the gasket, and is externally connected to the slip ring electrical connector. During the test, after adjusting the temperature chamber to a suitable temperature according to the air gap temperature field of the target motor, the rotational speed is gradually increased to the target speed to perform the performance test of the rotor sheath to be measured.

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