High-speed motor rotor testing device

Abstract

The invention relates to the technical field of structural balance testing through rotation, and discloses a high-speed motor rotor testing device which comprises a machine shell, a pair of bearing assemblies and a high-pressure pneumatic assembly used for driving a motor rotor to rotate. The radial magnetic suspension bearing comprises a radial rotor structure and a radial stator structure, the surface of the radial rotor is sleeved with a rotor lantern ring, the outer circumferential surface of the rotor lantern ring is concavely provided with a groove ring, the groove ring comprises a plurality of wedge-shaped groove bodies in an annular array, and each wedge-shaped groove body comprises a pressed groove surface; and a first high-pressure air nozzle of the high-pressure pneumatic assembly is arranged in the winding gap and is used for blowing high-pressure air for driving the motor rotor to rotate to the pressed groove surface, so that torque is continuously provided for the motor rotor, and the purpose of high-speed rotation test of the motor rotor is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of structural balance testing through rotation, and more specifically, to a high-speed motor rotor testing device. Background Technology

[0002] A magnetic levitation motor consists of a housing, a motor stator with windings, and a motor rotor with permanent magnets. The linear velocity on the surface of the magnetic levitation motor rotor is very high, so most of them adopt a solid shaft structure. The magnets are bonded to the grooves on the surface of the shaft, and a sheath is bonded to the outer surface of the magnets. The solid shaft, magnets, and sheath are fixed together by bonding. Therefore, it is necessary to test the structural strength of the electronic rotor.

[0003] The existing patent application CN116952175A, entitled "Online Detection Method for Bonding Quality of Surface-Modified Multipole Permanent Magnet Motor Rotor Magnets," describes a method for detecting the circumferential runout and diameter of the magnets using contact or non-contact methods. This method solves the problems of the inability to detect the external dimensions of the magnets and the difficulty in guaranteeing the circumferential form and position tolerances of the magnets after bonding. However, this patent application only describes the detection of the external dimensions and circumferential form and position tolerances of the bonded magnets, but it does not describe how to detect the structural strength of the motor rotor shaft, magnets, and sheaths under high-speed rotation. Summary of the Invention

[0004] The purpose of this invention is to provide a high-speed motor rotor testing device for detecting the structural strength of the motor rotor shaft, magnets, and sheaths when rotating at high speed. The device uses a high-pressure pneumatic assembly to generate high-pressure airflow to continuously provide torque to the motor rotor, thereby achieving the purpose of high-speed rotation testing of the motor rotor with a simple device structure.

[0005] The embodiments of the present invention are achieved through the following technical solutions: A high-speed motor rotor testing device includes a housing, a pair of bearing assemblies, and a high-pressure pneumatic assembly for driving the motor rotor to rotate. The pair of bearing assemblies are used to support both ends of the motor rotor. The motor rotor includes a shaft body and a magnet. An annular groove is opened in the middle of the shaft body, and the magnet is bonded in the annular groove. The shaft body is covered with a protective sleeve covering the magnet.

[0006] The bearing assembly includes a radial magnetic levitation bearing, which includes a radial rotor structure and a radial stator structure. The radial rotor structure is sleeved on the end of the shaft body, and a rotor collar is sleeved on the surface of the radial rotor. The outer circumferential surface of the rotor collar is recessed with a grooved ring, which includes a plurality of wedge-shaped groove bodies in an annular array, and the wedge-shaped groove bodies include a pressure-bearing groove surface. The radial stator structure includes a support ring and a plurality of coil windings arranged in the support ring, with a winding gap between each pair of adjacent coil windings.

[0007] The high-pressure pneumatic assembly includes a first main air passage and a first high-pressure air nozzle connected together. The first high-pressure air nozzle is disposed in the winding gap and faces the rotation direction of the motor rotor. The first high-pressure air nozzle is used to blow high-pressure gas that drives the motor rotor to rotate onto the pressure groove surface.

[0008] In one embodiment of the present invention, a hard baffle with a protective cover is fixedly connected to the inner surface of the housing, and an inner retaining ring is fixedly connected to the inner side of both ends of the hard baffle; a soft baffle is detachably connected to the inner surface of the hard baffle, and an inner spiral groove is formed on the inner surface of the soft baffle, extending from one end of the soft baffle to the other end of the soft baffle, and an outer spiral groove is formed on the outer surface of the soft baffle, with the inner and outer spiral grooves positioned opposite each other, and the soft baffle is divided into spiral strips by the inner and outer spiral grooves.

[0009] In one embodiment of the present invention, one end of the shaft body is configured as a driving end, and the other end of the shaft body is configured as a braking end. The wedge-shaped groove body of the braking end is assembled in the opposite direction to the wedge-shaped groove body of the driving end. The first main air passage and the first high-pressure air nozzle are located at the driving end. The high-pressure pneumatic assembly also includes a second main air passage and a second high-pressure air nozzle located at the braking end. The second high-pressure air nozzle faces the opposite direction to the rotation direction of the motor rotor, and the high-pressure gas blown by the second high-pressure air nozzle is used to brake the high-speed rotating motor rotor.

[0010] A reversing valve is configured between the first main air passage and the second main air passage. The reversing valve includes a valve body and a valve core distributed along the direction of gravity. The valve core is slidably disposed in the valve body. An air inlet passage is configured inside the valve core. The air inlet passage is connected to a hose. The hose is connected to a gas source that generates high-pressure gas. The upper side of the air inlet passage is connected to a first inner air passage, and the lower side of the air inlet passage is connected to a second inner air passage. A first outer air passage is opened on the upper side of the valve body for connecting to the first inner air passage, and a second outer air passage is opened on the lower side of the valve body for connecting to the second inner air passage. The first outer air passage is connected to the first main air passage, and the second outer air passage is connected to the second main air passage.

[0011] The valve body is equipped with a valve bottom support platform at the bottom, which has a first through hole and a hard retaining sleeve with a second through hole. The first and second through holes are coaxially distributed along the direction of gravity. A support rod is vertically fixed to the outer surface of the soft retaining sleeve, and the support rod is used to support the bottom of the valve core.

[0012] When the support rod is supported at the bottom of the valve core, the intake passage, the first inner air passage, the first outer air passage, and the first main air passage are connected in sequence; when the support rod is removed from the bottom of the valve core, the valve core falls to the upper surface of the valve bottom support platform, and the intake passage, the second inner air passage, the second outer air passage, and the second main air passage are connected in sequence.

[0013] In one embodiment of the present invention, a plurality of L-shaped clips are respectively distributed in a ring at both ends of the soft retaining sleeve, and a square groove for engaging the L-shaped clips is provided in the inner retaining ring; a plurality of support groups are fixedly connected in a ring on the outer surface of the soft retaining sleeve, and the support groups include a plurality of radial support columns distributed along the axial direction of the soft retaining sleeve, and a spherical clip is fixedly connected to the top of the radial support columns; a spherical groove for engaging the spherical clips is provided on the inner surface of the hard retaining sleeve; the support rod and the radial support columns are respectively fixedly connected to the outer surface of the spiral strip.

[0014] In one embodiment of the present invention, the inner surface of the soft retaining sleeve is provided with a plurality of flat grooves, the flat grooves are distributed along the axis of the soft retaining sleeve, the flat grooves extend from one end of the soft retaining sleeve to the other end of the soft retaining sleeve, the flat grooves are distributed opposite to the support group, and the flat grooves are disposed at the bottom of the support group.

[0015] In one embodiment of the present invention, the inner surface of the soft sleeve is provided with a plurality of T-shaped supports, which are fixedly connected to the inner surface of the spiral strip.

[0016] In one embodiment of the present invention, the slotted ring is disposed at the middle of the outer circumferential surface of the rotor collar; a plurality of wedge-shaped slot bodies of the annular array are connected in sequence; the wedge-shaped slot body further includes a guide groove surface, which is used to guide the high-pressure airflow to the pressure-receiving groove surface of the wedge-shaped slot body. The guide groove surface is distributed between two adjacent pressure-receiving groove surfaces, the bottom edge of the guide groove surface is connected to the bottom edge of one side of the pressure-receiving groove surface, and the top edge of the guide groove surface is connected to the top edge of the other side of the pressure-receiving groove surface.

[0017] In one embodiment of the present invention, the first high-pressure air nozzle is configured as a pair, the pair of first high-pressure air nozzles being centrally symmetrically distributed about the groove ring, and a first auxiliary air passage connecting the first main air passage and the first high-pressure air nozzle; the first high-pressure air nozzle is a flat nozzle.

[0018] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: 1) The high-pressure pneumatic components generate high-pressure airflow to drive the motor rotor to increase its speed and rotate at high speed. The high-pressure airflow method is simpler than the traditional drive motor structure, thus simplifying the structure of the test device. 2) On the one hand, the first high-pressure air nozzle is placed in the winding gap that exists between the coil windings. On the other hand, a rotor collar with a slotted ring is added by utilizing the circumferential gap that exists between the coil windings and the radial rotor. This makes full use of the existing structural space of the magnetic levitation bearing to set up the high-pressure pneumatic component without increasing the internal space of the housing or occupying the axial space of the motor rotor. This fully integrates the high-pressure pneumatic component and the radial magnetic levitation bearing, providing stable support for the motor rotor while driving it to rotate at high speed. This allows for testing of the structural strength of the motor rotor shaft, magnets, and sheaths under high-speed rotation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the internal structure of the high-speed motor rotor testing device of the present invention; Figure 2 This is a schematic diagram of the drive end of the high-speed motor rotor testing device of the present invention; Figure 3 This is a schematic diagram of the radial magnetic levitation bearing of the present invention; Figure 4 This is a schematic diagram of the structure of the first high-pressure air nozzle and rotor collar of the present invention; Figure 5 This is a perspective view of the rotor collar of the present invention; Figure 6 This is a cross-sectional view of the rigid retaining sleeve of the present invention; Figure 7 This is a perspective view of the soft retaining sleeve of the present invention; Figure 8 This is a first cross-sectional view of the reversing valve of the present invention, in which the first inner air passage is connected to the first outer air passage; Figure 9 This is a second cross-sectional view of the reversing valve of the present invention, in which the second inner air passage is connected to the second outer air passage.

[0021] Icons: 10-Housing, 21-Shaft body, 22-Magnet, 23-Sheath, 31-Radial rotor structure, 32-Radial stator structure, 32a-Support ring, 32b-Coil winding, 32c-Winding gap, 40-Rotor collar, 41-Wedge-shaped slot body, 41a-Pressure-bearing slot surface, 41b-Guide slot surface, 51-First main air passage, 52-First high-pressure air nozzle, 53-Second main air passage, 54-First auxiliary air passage, 60-Hard retaining sleeve, 61-Inner retaining ring, 62-Second through hole, 63-Square slot, 64-Spherical slot 70-Soft stop sleeve, 71-Inner spiral groove, 72-Outer spiral groove, 73-Spiral strip, 74-Support rod, 75-L-shaped clamp, 76-Radial support column, 77-Spherical clamp, 78-Flat groove, 79-T-shaped support, 80-Reversing valve, 81-Valve body, 81a-First external air passage, 81b-Second external air passage, 81c-Valve bottom support platform, 81d-First through hole, 82-Valve core, 82a-Inlet passage, 82b-First internal air passage, 82c-Second internal air passage, 83-Hose, 91-Axial magnetic levitation bearing, 92-Bearing seat. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that if terms such as "inner" or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Please refer to Figures 1-9 A high-speed motor rotor testing device includes a housing 10, a pair of bearing assemblies, and a high-pressure pneumatic assembly for driving the motor rotor to rotate. The pair of bearing assemblies supports both ends of the motor rotor. (Refer to...) Figure 1The motor rotor includes a shaft body 21 and a magnet 22. An annular groove is formed in the middle of the shaft body 21, and the magnet 22 is bonded to the annular groove. A sheath 23 covering the magnet 22 is fitted onto the shaft body 21. The sheath 23 is bonded to the outside of the magnet 22, and both ends of the sheath 23 are bonded to the shaft body 21. The sheath 23 is made of alloy steel or carbon fiber material.

[0028] Reference Figure 2 and Figure 3 The bearing assembly includes a radial magnetic levitation bearing, which comprises a radial rotor structure 31 and a radial stator structure 32. The radial rotor structure 31 is fitted onto the end of the shaft body 21, and a rotor collar 40 is fitted onto the surface of the radial rotor. It should be noted that the rotor collar 40 is made of a non-metallic material and will not affect the normal operation of the radial magnetic levitation bearing. The outer circumferential surface of the rotor collar 40 is recessed with a grooved ring, which includes a plurality of wedge-shaped groove bodies 41 arranged in a ring. Each wedge-shaped groove body 41 includes a pressure-bearing groove surface 41a, which is perpendicular to the outer circumferential tangent of the rotor collar 40. The radial stator structure 32 includes a support ring 32a and a plurality of coil windings 32b disposed within the support ring 32a. There is a winding gap 32c between each pair of adjacent coil windings 32b. This winding gap 32c is inherent in existing radial magnetic levitation bearings. Figure 3 and Figure 4 .

[0029] Reference Figure 3 The high-pressure pneumatic assembly includes a first main air passage 51 and a first high-pressure air nozzle 52 connected together. The first high-pressure air nozzle 52 is disposed in the winding gap 32c and faces the rotation direction of the motor rotor. The first high-pressure air nozzle 52 is used to blow high-pressure gas that drives the motor rotor to rotate onto the pressure groove surface 41a.

[0030] It should be noted that the high-pressure pneumatic assembly generates high-pressure airflow to drive the motor rotor to increase its speed and rotate at high speed. The use of high-pressure airflow is simpler than the traditional drive motor structure, thus simplifying the structure of the test device. On the one hand, the first high-pressure air nozzle 52 is placed in the winding gap 32c that exists between the coil windings 32b. On the other hand, a rotor collar 40 with a slotted ring is added using the circumferential gap that exists between the coil windings 32b and the radial rotor. This fully utilizes the existing structural space of the magnetic levitation bearing to set up the high-pressure pneumatic assembly without increasing the internal space of the housing 10, and without occupying the axial space of the motor rotor. Thus, the high-pressure pneumatic assembly and the radial magnetic levitation bearing are fully integrated, providing stable support for the motor rotor while driving it to rotate at high speed. This allows for testing of the structural strength of the motor rotor shaft body 21, magnet 22, and sheath 23 under high-speed rotation.

[0031] Reference Figure 1 In this embodiment, a hard retaining sleeve 60 with a protective cover 23 is fixedly connected to the inner surface of the housing 10, and inner retaining rings 61 are fixedly connected to the inner sides of both ends of the hard retaining sleeve 60; a soft retaining sleeve 70 is detachably connected to the inner surface of the hard retaining sleeve 60, and an inner spiral groove 71 is formed on the inner surface of the soft retaining sleeve 70, extending from one end of the soft retaining sleeve 70 to the other end of the soft retaining sleeve 70. An outer spiral groove 72 is formed on the outer surface of the soft retaining sleeve 70, and the inner spiral groove 71 and the outer spiral groove 72 are positioned opposite each other. The soft retaining sleeve 70 is divided into spiral strips 73 by the inner spiral groove 71 and the outer spiral groove 72, as shown in the figure. Figure 7 .

[0032] It should be noted that this high-speed motor rotor testing device conducts overspeed tests on the motor rotor of a high-speed motor. Especially during the research and development stage of high-speed motors, it is unknown whether the bonding strength between the magnet 22, the sheath 23, and the shaft body 21 can meet the requirements of ultra-high speed. When the magnet 22 and the sheath 23 detach from the shaft body 21 due to the large centrifugal force during the test, the magnet 22 is thrown out, and the sheath 23 is broken and torn. The high-speed, irregular collision between the two can damage the internal structure of the housing 10, the magnetic levitation bearing, and all other internal components and charged components. It is also likely to generate sparks and high temperatures due to the collision, thus creating safety hazards. Therefore, the hard retaining sleeve 60, combined with the inner retaining ring 61, covers the detached magnet 22 and sheath 23. The thickness and hardness of the hard retaining sleeve 60 can withstand the impact of the magnet 22 and the sheath 23. More importantly, the soft sleeve 70 is used to buffer and dissipate the kinetic energy of the magnet 22 and the sheath 23, and can prevent sparks from being generated by collision. In this embodiment, the soft sleeve 70 is made of rubber. Due to the impact force of the magnet 22 and the sheath 23, and because the magnet 22 and the sheath 23 are relatively sharp, after the magnet 22 and the sheath 23 continuously impact and pull the inner surface of the soft sleeve 70, the soft sleeve 70 will crack along its own inner spiral groove 71 and outer spiral groove 72 to form a strip-shaped rubber strip, namely the spiral strip 73. The spiral strip 73 wraps around and pulls the magnet 22 and the sheath 23 that are spinning at high speed between the shaft body 21 and the hard sleeve 60, thereby greatly reducing the destructive force of the magnet 22 and the sheath 23.

[0033] In this embodiment, one end of the shaft body 21 is configured as a driving end, and the other end of the shaft body 21 is configured as a braking end. The wedge-shaped groove body 41 of the braking end and the wedge-shaped groove body 41 of the driving end are assembled in opposite directions. The radial magnetic levitation bearing structures and installation methods of the driving end and the braking end are exactly the same, and the rotor collars 40 at both ends are also the same, except that the installation directions of the rotor collars 40 are opposite.

[0034] The first main air passage 51 and the first high-pressure air nozzle 52 are located at the drive end. The high-pressure pneumatic assembly also includes a second main air passage 53 and a second high-pressure air nozzle located at the braking end. The second high-pressure air nozzle faces the opposite direction of the motor rotor's rotation, and the high-pressure gas blown by the second high-pressure air nozzle is used to brake the high-speed rotating motor rotor. The second high-pressure air nozzle faces the pressure groove surface 41a of the rotor collar 40. The structure and installation method of the second high-pressure air nozzle and the first high-pressure air nozzle 52 are exactly the same. Because the installation direction of the rotor collar 40 is opposite, a reverse braking effect is achieved.

[0035] Reference Figure 1 A reversing valve 80 is configured between the first main air passage 51 and the second main air passage 53; see reference. Figure 8 The reversing valve 80 includes a valve body 81 and a valve core 82 distributed along the direction of gravity. The valve core 82 is slidably disposed within the valve body 81. An air inlet 82a is disposed within the valve core 82, and a flexible hose 83 is connected to the air inlet 82a. The flexible hose 83 is connected to a gas source that generates high-pressure gas. (Refer to...) Figure 1 The upper side of the intake duct 82a is connected to the first inner air passage 82b, and the lower side of the intake duct 82a is connected to the second inner air passage 82c. The upper side of the valve body 81 has a first outer air passage 81a for connecting to the first inner air passage 82b, and the lower side of the valve body 81 has a second outer air passage 81b for connecting to the second inner air passage 82c. The first outer air passage 81a is connected to the first main air passage 51, and the second outer air passage 81b is connected to the second main air passage 53. (Refer to...) Figure 8 and Figure 9 .

[0036] The valve body 81 has a valve bottom support platform 81c at its bottom, which has a first through hole 81d. The rigid sleeve 60 has a second through hole 62. The first through hole 81d and the second through hole 62 are coaxially distributed along the direction of gravity. A support rod 74 is vertically fixed to the outer surface of the flexible sleeve 70. The support rod 74 is used to support the bottom of the valve core 82.

[0037] During the test, when the magnet 22 and the sheath 23 remain intact, the support rod 74 is supported at the bottom of the valve core 82, and the air inlet 82a, the first inner air inlet 82b, the first outer air inlet 81a, and the first main air inlet 51 are connected in sequence. The high-pressure gas accelerates the motor rotor through the first high-pressure nozzle 52.

[0038] When the magnet 22 and the sheath 23 detach from the main shaft, the magnet 22 and the sheath 23 tear the soft retainer 70, and the support rod 74 is pulled out from the second through hole 62. The support rod 74 is removed from the bottom of the valve core 82, and the valve core 82 falls to the upper surface of the valve bottom support platform 81c. The air inlet 82a, the second inner air inlet 82c, the second outer air inlet 81b, and the second main air inlet 53 are sequentially connected. At this time, the first main air inlet 51 is closed, and high-pressure gas is blown to the braking end through the second main air inlet 53 and the second high-pressure air nozzle to brake the motor rotor, thereby accelerating the motor rotor to decelerate from the high-speed rotation condition as soon as possible, reducing the kinetic energy of the rotating parts inside the housing 10, and reducing the destructive force.

[0039] It should be noted that after the soft sleeve 70 is torn and pulled by the magnet 22 and the protective sleeve 23, a spiral strip 73 is formed. At the same time, after the spiral strip 73 is pulled, the support rod 74 is also subjected to downward tension. The support rod 74 falls out of the first through hole 81d. After the support rod 74 is separated from the bottom of the valve core 82, the valve core 82 falls down, and the second high-pressure air nozzle starts to reverse the braking. Therefore, when the magnet 22 and sheath 23 detach from the shaft body 21 due to insufficient bonding strength or structural strength, the soft retainer 70 not only buffers and dissipates the kinetic energy of the rapidly spinning magnet 22 and sheath 23, but also prevents sparks from collisions. Furthermore, under pressure, it is impacted and pulled into strips that further dissipate the kinetic energy of the magnet 22 and sheath 23 fragments. Additionally, the support rod 74 disconnects the driving force at the drive end and initiates the reverse braking force at the braking end. Simultaneously, the second high-pressure air nozzle applies braking, and the rubber strip that slows down the magnet 22 also provides auxiliary braking. The rubber material is elastic and soft, and will not damage the shaft body 21. When the rubber strip is subjected to significant force, it will break into multiple sections, thus dissipating kinetic energy. By quickly stopping the shaft body 21, the broken magnet 22, and the sheath 23 from high-speed rotation, damage and potential accident risks can be minimized.

[0040] Reference Figure 6 and Figure 7 In this embodiment, the two ends of the soft retaining sleeve 70 are respectively provided with a plurality of L-shaped clips 75 arranged in a ring, and the inner retaining ring 61 is provided with a square slot 63 for engaging the L-shaped clips 75; thus, the two ends of the soft retaining sleeve 70 are supported by the inner retaining ring 61 through the L-shaped clips 75.

[0041] The outer surface of the soft retaining sleeve 70 is fixedly connected with several sets of support groups in a ring shape. Each support group includes several radial support columns 76 distributed along the axial direction of the soft retaining sleeve 70, with the radial support columns 76 of the same support group located on the same straight line. A spherical clamp 77 is fixedly connected to the top of the radial support column 76; the inner surface of the hard retaining sleeve 60 is provided with a spherical groove 64 for engaging the spherical clamp 77; the outer surface of the soft retaining sleeve 70 is engaged with the spherical groove 64 by the spherical clamp 77. Thus, the soft retaining sleeve 70 achieves the support requirement while possessing a certain degree of flexibility. The soft retaining sleeve 70 is stably supported by the L-shaped clamp 75 and the spherical clamp 77 to provide space for the normal rotation of the motor shaft and avoid unnecessary interference and additional accidents. The flexibility of the soft retaining sleeve 70 provides protection for the insufficiently strong magnet 22 and the sheath 23, and the L-shaped clamp 75 and the spherical clamp 77 can be pulled away from the hard retaining sleeve 60.

[0042] It should be noted that by setting radial support columns 76 to support the hard sleeve 60 and the soft sleeve 70, a gap is formed between the soft sleeve 70 and the hard sleeve 60; when the magnet 22 or the sheath 23 impacts the inner surface of the soft sleeve 70, this gap provides enough space for the soft sleeve 70 to deform. Only after being subjected to force and deformed can the soft sleeve 70 be torn open along the outer spiral groove 72 and the inner spiral groove 71 to form the spiral strip 73.

[0043] The support rod 74 and the radial support column 76 are fixedly connected to the outer surface of the spiral strip 73, respectively. The support rod 74 and the radial support column 76 are not connected to the outer spiral groove 72, so as to ensure that the soft sleeve 70 can be torn into the spiral strip 73 along the outer spiral groove 72 and the inner spiral groove 71.

[0044] Reference Figure 7 In this embodiment, the inner surface of the soft retaining sleeve 70 is recessed with several flat grooves 78. The flat grooves 78 are distributed along the axis of the soft retaining sleeve 70, extending from one end of the soft retaining sleeve 70 to the other end. The flat grooves 78 are distributed one-to-one with the support assembly and are located at the bottom of the support assembly. The flat grooves 78 are provided to facilitate the simultaneous pressing of spherical clamps 77 that are on the same straight line into the quasi-spherical clamping grooves 64. Specifically, a rigid square rod is passed through both ends of the soft retaining sleeve 70. After the rigid square rod abuts against the flat groove 78 and pressure is applied, the spherical clamps 77 corresponding to the outer side of the flat groove 78 can be pushed into the quasi-spherical clamping grooves 64. The quasi-spherical clamping grooves 64 are clamping grooves that are more than hemispherical, and the shape of the quasi-spherical clamping grooves 64 is similar to a 3 / 4 sphere.

[0045] Reference Figure 7In this embodiment, the inner surface of the soft baffle 70 is provided with a plurality of T-shaped supports 79, which are fixedly connected to the inner surface of the spiral strip 73. The T-shaped supports 79 provide pulling force for the flying fragments of the magnet 22 and the sheath 23, further ensuring that the soft baffle 70 is torn into the spiral strip 73; thereby further ensuring that the support rod 74 is pulled out and the second high-pressure air nozzle is activated after the magnet 22 and the sheath 23 fly out.

[0046] Reference Figure 5 In this embodiment, the slotted ring is disposed at the middle of the outer circumferential surface of the rotor collar 40; the plurality of wedge-shaped slot bodies 41 of the annular array are connected in sequence; the wedge-shaped slot body 41 also includes a guide channel surface 41b, which is used to guide the high-pressure airflow to the pressure-receiving slot surface 41a of the wedge-shaped slot body 41. The guide channel surface 41b is distributed between two adjacent pressure-receiving slot surfaces 41a, the bottom edge of the guide channel surface 41b is connected to the bottom edge of one side of the pressure-receiving slot surface 41a, and the top edge of the guide channel surface 41b is connected to the top edge of the other side of the pressure-receiving slot surface 41a. Thus, the structure of the wedge-shaped slot body 41 is simple and reliable enough. The guide channel surface 41b ensures that as much high-pressure gas as possible is blown toward the pressure-receiving slot surface 41a, and the pressure-receiving slot surface 41a ensures that as much kinetic energy of the high-pressure gas as possible is received and converted into torque for the rotation of the motor rotor.

[0047] Reference Figure 3 In this embodiment, the first high-pressure nozzles 52 are configured as a pair, which are centrally symmetrically distributed about the groove ring. A first auxiliary air passage 54 connects the first main air passage 51 and the first high-pressure nozzles 52. The first high-pressure nozzles 52 are flat nozzles. The centrally symmetrical distribution of the first high-pressure nozzles 52 increases the rotational driving force and makes the driving force formed by the applied force more balanced. The flat nozzle matches the shape of the pressure-bearing groove surface 41a, providing a larger pressure-bearing surface.

[0048] It should be noted that the housing 10 is also equipped with commonly used sensors for high-speed motors, such as a speed sensor. These sensors are standard components of high-speed motors and will not be described in detail here. The speed sensor is used to monitor the rotational speed of the motor rotor in real time. Once the test objective is achieved, the high-pressure gas source outside the housing 10 is shut off, the rotation drive of the motor rotor is released, and it gradually decelerates on its own. During the overspeed test, if the sheath 23 and magnet 22 detach from the shaft body 21 due to the centrifugal force generated by high-speed rotation, the sheath 23 and magnet 22 will collide irregularly within the annular cavity between the shaft body 21 and the hard retaining sleeve 60, thus tearing the complete soft retaining sleeve 70. The soft retaining sleeve 70 will be torn into strips along the inner spiral groove 71 and the outer spiral groove 72, and the support rod 74 will be pulled and detached from the bottom of the valve core 82. The valve core 82 will fall onto the upper surface of the valve bottom support platform 81c. The first high-pressure air nozzle 52 at the drive end will stop spraying air, and the rotation drive will stop. The second high-pressure air nozzle at the braking end will start spraying air, initiating reverse braking. The motor rotor speed will decrease, and the speed sensor will monitor the shaft body 21 as it rapidly decelerates due to reverse braking. When the speed sensor detects that the motor rotor speed has dropped to near stop, the compressed gas source outside the housing 10 will be shut off, releasing the reverse braking of the motor rotor. Finally, the shaft body 21 will stop rotating due to internal friction.

[0049] It should also be noted that the housing 10 is equipped with an axial magnetic levitation bearing 91 and a spare bearing seat 92 to provide rotational support for the rotation of the motor rotor.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-speed motor rotor testing device, characterized in that, it comprises a casing, a pair of bearing assemblies for supporting both ends of a motor rotor, and a high-pressure pneumatic assembly for driving the motor rotor to rotate; the motor rotor comprises a shaft body and a magnetic steel, the shaft body has a ring-shaped groove in the middle part, and the magnetic steel is bonded in the ring-shaped groove; the shaft body is sleeved with a sheath covering the magnetic steel; the bearing assembly comprises a radial magnetic suspension bearing, which comprises a radial rotor structure and a radial stator structure; the radial rotor structure is sleeved on the end of the shaft body, and the radial rotor surface is sleeved with a rotor collar; the outer circumferential surface of the rotor collar is concavely provided with a groove ring, which comprises a plurality of wedge-shaped groove bodies arranged in an annular array, and each wedge-shaped groove body comprises a pressure receiving groove surface; the radial stator structure comprises a support ring and a plurality of coil windings arranged in the support ring; there is a winding gap between every two adjacent coil windings; the high-pressure pneumatic assembly comprises a first main air channel and a first high-pressure air nozzle in communication; the first high-pressure air nozzle is arranged in the winding gap; the first high-pressure air nozzle is directed towards the rotation direction of the motor rotor; and the first high-pressure air nozzle is used for blowing high-pressure gas to the pressure receiving groove surface to drive the motor rotor to rotate.

2. The high speed electric machine rotor test device of claim 1, wherein, The inner side of both ends of the hard baffle sleeve is fixedly connected with an inner baffle ring; the inner surface of the hard baffle sleeve is detachably connected with a soft baffle sleeve; the inner surface of the soft baffle sleeve is provided with an inner spiral groove; the inner spiral groove extends from one end of the soft baffle sleeve to the other end of the soft baffle sleeve; the outer surface of the soft baffle sleeve is provided with an outer spiral groove; the positions of the inner spiral groove and the outer spiral groove are opposite to each other; and the soft baffle sleeve is divided into spiral strips by the inner spiral groove and the outer spiral groove.

3. A high speed motor rotor test device according to claim 2, wherein One end of the shaft body is arranged as a driving end, and the other end of the shaft body is arranged as a braking end; the wedge-shaped groove bodies of the braking end and the wedge-shaped groove bodies of the driving end are arranged in opposite directions; the first main air channel and the first high-pressure air nozzle are located at the driving end; the high-pressure pneumatic assembly further comprises a second main air channel and a second high-pressure air nozzle located at the braking end; the second high-pressure air nozzle is directed towards the opposite direction of the rotation direction of the motor rotor; and the high-pressure gas blown by the second high-pressure air nozzle is used for braking the high-speed rotating motor rotor; a reversing valve is arranged between the first main air channel and the second main air channel; the reversing valve comprises a valve body and a valve core distributed along the direction of gravity; the valve core is slidably arranged in the valve body; the valve core is provided with an air inlet channel; a hose connected to a gas source generating high-pressure gas is connected to the air inlet channel; the upper side of the air inlet channel is communicated with a first inner air channel; the lower side of the air inlet channel is communicated with a second inner air channel; the upper side of the valve body is provided with a first outer air channel for connecting the first inner air channel; the lower side of the valve body is provided with a second outer air channel for connecting the second inner air channel; the first outer air channel is communicated with the first main air channel; and the second outer air channel is communicated with the second main air channel; a valve bottom support table is arranged at the bottom of the valve body; the valve bottom support table is provided with a first through hole; the hard baffle sleeve is provided with a second through hole; the first through hole and the second through hole are coaxially distributed along the direction of gravity; and the outer surface of the soft baffle sleeve is vertically fixedly connected with a support rod for supporting the bottom of the valve core. When the support rod is supported on the bottom of the valve core, the air inlet, the first inner air channel, the first outer air channel and the first main air channel are sequentially communicated; when the support rod is removed from the bottom of the valve core, the valve core falls onto the upper surface of the valve bottom support table, and the air inlet, the second inner air channel, the second outer air channel and the second main air channel are sequentially communicated.

4. A high speed motor rotor test device according to claim 3, wherein The soft baffle is provided with a plurality of L-shaped clamping heads in annular distribution at two ends thereof, and the inner baffle ring is provided with square clamping grooves for clamping the L-shaped clamping heads; the outer surface of the soft baffle is fixedly connected with a plurality of support groups in annular distribution, the support group comprises a plurality of radial support columns distributed in the axial direction of the soft baffle, and the top of the radial support column is fixedly connected with a spherical clamping head; the inner surface of the hard baffle is provided with spherical clamping grooves for clamping the spherical clamping heads; and the support rod and the radial support column are fixedly connected to the outer surface of the spiral strip.

5. A high speed motor rotor test device as set forth in claim 4 wherein, The inner surface of the soft baffle is concavely provided with a plurality of flat grooves, the flat grooves are distributed along the axis of the soft baffle, the flat grooves extend from one end of the soft baffle to the other end of the soft baffle, the flat grooves are in one-to-one distribution with the support groups, and the flat grooves are arranged at the bottom of the support groups.

6. A high speed motor rotor test device according to any one of claims 2-4, wherein The inner surface of the soft baffle is provided with a plurality of T-shaped supporting heads, and the T-shaped supporting heads are fixedly connected to the inner surface of the spiral strip.

7. A high speed motor rotor test device according to any one of claims 1-3, wherein The groove ring is arranged at the middle part of the outer circumferential surface of the rotor sleeve ring; the plurality of wedge-shaped groove bodies in annular array are sequentially connected; the wedge-shaped groove body further comprises a flow guide groove surface for guiding high-pressure gas flow to the pressure receiving groove surface of the wedge-shaped groove body, the flow guide groove surface is distributed between two adjacent pressure receiving groove surfaces, the bottom edge of the flow guide groove surface is connected with the bottom edge of the pressure receiving groove surface on one side, and the top edge of the flow guide groove surface is connected with the top edge of the pressure receiving groove surface on the other side.

8. A high speed motor rotor test device according to claim 7, wherein The first high-pressure gas nozzle is arranged in a pair, the pair of first high-pressure gas nozzles are centrally symmetrically distributed with respect to the groove ring, and the first main air channel is connected with the first high-pressure gas nozzle through a first auxiliary air channel; and the first high-pressure gas nozzle adopts a flat nozzle.

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