Axial-radial integrated displacement sensor and magnetic suspension compressor

Abstract

The embodiment of the utility model provides an axial and radial integrated displacement sensor and a magnetic suspension compressor, and the axial and radial integrated displacement sensor comprises a stator iron core which comprises two layers of stator punching sheets with the same structure, the stator punching sheet is at least provided with an annular yoke part and a plurality of stator teeth which extend along the radial direction on the inner wall surface of the yoke part and have the same size, and the plurality of stator teeth with the same size are non-uniformly distributed along the circumferential direction; the two layers of stator punching sheets are superposed in a staggered manner along the circumferential direction to form a plurality of axial measurement groups and radial measurement groups which are uniformly arranged at intervals along the circumferential direction of the yoke part, each axial measurement group comprises single-layer stator teeth for measuring axial displacement, and each radial measurement group comprises double-layer stator teeth for measuring radial displacement. According to the embodiment of the invention, the double-layer structure effectively reduces the axial size, enables the whole displacement sensor to be more compact in structure, facilitates the reduction of the axial length of the rotor of the magnetic suspension motor, and can improve the maximum rotation speed of the magnetic suspension motor.

Description

Technical Field

[0001] This specification relates to the field of displacement sensor technology, and in particular to an integrated axial and radial displacement sensor and a magnetic levitation compressor. Background Technology

[0002] In a magnetic levitation system, the magnetic bearing needs to be paired with a displacement sensor to monitor the rotor position in real time. When the rotor deviates from the given rotation center, the displacement sensor feeds the displacement signal back to the control system, and the magnetic bearing's attraction force is adjusted to pull the rotor back to the given rotation center. Inductive displacement sensors are commonly used in magnetic levitation systems because they are highly resistant to interference, low in cost, and widely applicable.

[0003] In existing technologies, displacement sensors typically employ an axial three-layer structure, such as... Figure 1 As shown, three layers are required axially: the outer two layers are axial sensors, and the middle layer is a radial sensor. The stator laminations for the axial sensors and radial sensors have different structures, requiring two different molds for the stator laminations, increasing manufacturing costs. Furthermore, the height difference between the three layers for displacement monitoring results in a long overall axial length, occupying a large space. When applied to magnetic levitation high-speed motors, the longer rotor makes it difficult to achieve high speeds in terms of rotor dynamics.

[0004] There is currently no effective solution to the above problems. Utility Model Content

[0005] This specification provides an integrated axial and radial displacement sensor and a magnetic levitation compressor to solve the problem that existing three-layer displacement sensors occupy a large amount of overall space.

[0006] This specification provides an embodiment of an integrated axial and radial displacement sensor, comprising: a stator core, the stator core including two layers of stator laminations with identical structures, each stator lamination having at least an annular yoke and a plurality of stator teeth of the same size extending radially along the inner wall surface of the yoke, the plurality of stator teeth of the same size being unevenly arranged circumferentially; the two layers of stator laminations being staggered and superimposed circumferentially to form a plurality of axial measurement groups and radial measurement groups evenly spaced along the circumference of the yoke, each axial measurement group including a single layer of stator teeth for measuring axial displacement, and each radial measurement group including a double layer of stator teeth for measuring radial displacement.

[0007] In one embodiment of this specification, the stator lamination has multiple sets of stator teeth, each set of stator teeth containing 3m stator teeth, where m is a positive integer greater than 0.

[0008] In one embodiment of this specification, the stator teeth are spaced X degrees apart from each group of stator teeth, and the stator teeth are spaced 2X degrees apart from each other. The two layers of stator laminations are stacked together with a circumferential offset of X degrees to form the stator core.

[0009] In one embodiment of this specification, the stator lamination has 4N sets of stator teeth, where N is a positive integer greater than 0.

[0010] In one embodiment of this specification, the stator core includes a first stator lamination and a second stator lamination with identical structures. Each axial measurement group includes at least one single-layer stator tooth located on the first stator lamination and one single-layer stator tooth located on the second stator lamination. Each radial measurement group includes at least two double-layer stator teeth. The axial measurement groups and the radial measurement groups are arranged alternately in sequence.

[0011] In one embodiment of this specification, the device further includes: a first axial detection coil, a second axial detection coil, and a plurality of radial detection coils. In each radial measurement group, the radial detection coil is wound in series on each of the double-layer stator teeth. In each axial measurement group, the first axial detection coil is wound in series on the single-layer stator teeth located on the first stator lamination. In each axial measurement group, the second axial detection coil is wound in series on the single-layer stator teeth located on the second stator lamination.

[0012] In one embodiment of this specification, the stator teeth in the stator laminations are of the same length.

[0013] In one embodiment of this specification, it further includes: a winding skeleton having a radially extending through hole for fitting stator teeth, the outer periphery of the through hole being provided with a wire groove for winding a coil, and one end of the through hole having a radially extending snap-fit ​​portion for clamping the stator core yoke.

[0014] In one embodiment of this specification, the snap-fit ​​portion includes a first snap-fit ​​piece and a second snap-fit ​​piece that are axially opposed, and the first snap-fit ​​piece and the second snap-fit ​​piece are press-fitted into the stator core yoke portion.

[0015] This specification also provides a magnetic levitation compressor, including: the aforementioned integrated axial and radial displacement sensor.

[0016] This specification provides an integrated axial and radial displacement sensor. The stator core can comprise two layers of stator laminations with identical structures, eliminating the need for multiple different stator lamination molds. This simplifies manufacturing and installation processes. Furthermore, the double-layer structure effectively reduces the axial dimension, making the entire displacement sensor structure more compact. This is beneficial for reducing the axial length of the magnetic levitation motor rotor, thereby increasing the maximum speed of the magnetic levitation motor. Each stator lamination layer can have an annular yoke and multiple stator teeth extending radially along the inner wall of the yoke. The stator teeth on a single-layer stator lamination can be unevenly distributed circumferentially, allowing two different stator tooth combinations to be formed when the two layers of stator laminations are staggered circumferentially. The double-layer stator teeth can be used to detect radial displacement, while the single-layer stator teeth can be used to detect axial displacement, thus integrating the axial and radial displacement sensors into one unit. Furthermore, multiple axial and radial measurement groups can be evenly and spaced along the yoke. Arranging the axial and radial measurement groups independently can prevent the axial and radial magnetic circuits from intersecting, thus avoiding mutual interference between axial and radial signals and ensuring the stability of the magnetic levitation system control. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the three-layer stator core structure provided in the embodiments of this specification;

[0019] Figure 2 This is a schematic diagram of the stator lamination structure provided in the embodiments of this specification;

[0020] Figure 3 This is a schematic diagram of a stator core according to an embodiment provided in this specification;

[0021] Figure 4 This is a schematic diagram of another embodiment of the stator core provided in the embodiments of this specification;

[0022] Figure 5 This is a schematic diagram of a stator lamination with short teeth provided according to an embodiment of this specification;

[0023] Figure 6 This is a schematic diagram of a stator core with short teeth provided according to an embodiment of this specification;

[0024] Figure 7 This is a schematic diagram of the winding skeleton provided in the embodiments of this specification;

[0025] Figure 8 This is a schematic diagram of the structure for fixing the winding frame to the stator core according to the embodiments provided in this specification;

[0026] Figure 9 This is a schematic diagram of the winding output of a three-layer structure provided in the embodiments of this specification.

[0027] Explanation of icon numbers:

[0028]

[0029] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The principles and spirit of embodiments of this specification will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement the embodiments of this specification, and are not intended to limit the scope of the embodiments in any way. Rather, these embodiments are provided to make the disclosure of embodiments of this specification more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0031] It should be noted that when a component is referred to as being "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component. All directional designations in this document (such as up, down, left, right, front, back, vertical, horizontal, etc.) are used only to explain the relative positional relationships and movements between components in a specific orientation (as shown in the accompanying drawings). If the specific orientation changes, the directional designation will also change accordingly, and does not represent the only embodiment.

[0032] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figure 2-5 This embodiment can provide an integrated axial and radial displacement sensor S, which may include: a stator core 100, the stator core 100 comprising two layers of stator laminations 110 / 120 with identical structures, the stator laminations 110 / 120 having at least an annular yoke 101 and a plurality of stator teeth 102 of the same size extending radially along the inner wall surface of the yoke, the plurality of stator teeth 102 of the same size in the stator laminations 110 / 120 being unevenly arranged; the two layers of stator laminations 110 / 120 being stacked at an angle offset in the circumferential direction to form a plurality of axial measurement groups 10a and radial measurement groups 10b evenly spaced along the circumferential direction of the yoke, each of the axial measurement groups 10a containing a single layer of stator teeth for measuring axial displacement, and each of the radial measurement groups 10b containing a double layer of stator teeth for measuring radial displacement.

[0034] In this embodiment, a three-degree-of-freedom inductive displacement sensor S with a double-layer structure can be provided, capable of simultaneously detecting axial and radial displacement. The double-layer structure has a small axial dimension; in high-speed magnetic levitation motors, a smaller axial dimension results in a higher achievable maximum speed. It can be applied to displacement detection in industrial equipment such as blowers, compressors, vacuum pumps, and molecular pumps, where there are specific requirements for system size, weight, and accuracy, demonstrating high practicality and wide applicability.

[0035] In this embodiment, the integrated axial-radial displacement sensor S may include a stator core 100, which may include a first stator lamination 110 and a second stator lamination 120. The first stator lamination 110 and the second stator lamination 120 have the same structure, eliminating the need for multiple different stator lamination dies and simplifying the structure. Each layer of stator laminations may have an annular yoke 101 and multiple stator teeth 102 extending radially along the inner wall of the yoke 101. The yoke 101 and the stator teeth 102 may be integrally formed to improve reliability during high-speed rotation.

[0036] In this embodiment, the two stator laminations 110 / 120 are stacked in a circumferentially staggered manner to form two different stator tooth combinations: a double-layer stator tooth composed of stator teeth with the same axial thickness and length, and a single-layer stator tooth set only on one of the two stator laminations in the axial direction. The double-layer stator tooth can be used to detect radial displacement, and the single-layer stator tooth can be used to detect axial displacement, thereby integrating the axial displacement sensor and the radial displacement sensor.

[0037] In this embodiment, the axial measurement group 10a can refer to a group of stator teeth forming an axial magnetic circuit, and the radial measurement group 10b can refer to a group of stator teeth forming a radial magnetic circuit. Each axial measurement group 10a can contain a single layer of stator teeth, and each radial measurement group 10b can contain a double layer of stator teeth. The axial measurement groups 10a and radial measurement groups 10b can be arranged independently and at intervals.

[0038] In some embodiments, each axial measurement group 10a may include two single-layer stator teeth to cooperate with the winding to form an axial magnetic circuit, and each radial measurement group 10b may include two double-layer stator teeth to cooperate with the winding to form a radial magnetic circuit. It is understood that each axial measurement group 10a and each radial measurement group 10b may also include more single-layer and double-layer stator teeth, such as four or six, etc., depending on the actual situation. This specification does not limit this aspect in the embodiments.

[0039] In cases where each axial measurement group 10a and each radial measurement group 10b contains multiple single-layer or double-layer stator teeth, such as Figure 3 and Figure 4 As shown, the axial measurement group 10a and the radial measurement group 10b can be arranged in an overlapping or independently spaced manner. However, Figure 3 The staggered arrangement of the axial measurement group 10a and the radial measurement group 10b can cause the axial and radial magnetic circuits to intersect, which can easily lead to mutual interference of signals and affect the stability of the magnetic levitation control system. Figure 4 By arranging the axial measurement group 10a and the radial measurement group 10b independently, there is no problem of intersection between the axial magnetic circuit and the radial magnetic circuit, which avoids mutual interference between the axial and radial signals and ensures the stability of the magnetic levitation system control.

[0040] In this embodiment, when each axial measuring group 10a contains two or more single-layer stator teeth, the axial positions of the multiple single-layer stator teeth can be staggered, that is, one on the first stator lamination 110, another on the second stator lamination 120, and so on. The specific arrangement can be determined according to actual circumstances, and this embodiment does not limit this.

[0041] In this embodiment, the two stator teeth 102 in the double-layer stator teeth can be the same size.

[0042] In this embodiment, because the thickness of the single-layer stator teeth is different from that of the double-layer stator teeth, two different sizes of winding bobbins 200 are required. Therefore, as... Figure 5 As shown, the stator laminations may also include short teeth with even shorter radial lengths. These short teeth are not used for measurement but only for fixing. The short teeth, in conjunction with the aforementioned single-layer stator teeth, ensure that the thickness near the yoke 101 is the same as that of the double-layer stator teeth. This allows for the use of a winding bobbin of the same size, simplifying the manufacturing and installation processes.

[0043] In this embodiment, in order to form two different stator tooth combinations after the two stator laminations are stacked in a staggered manner along the circumference, the stator teeth 102 on the single-layer stator lamination can be unevenly distributed along the circumference, so that there are only single-layer stator teeth in some positions of the yoke 101.

[0044] Since the misaligned and superimposed axial measurement group 10a and radial measurement group 10b need to be uniformly distributed for displacement detection, the angle between the stator teeth 102 on the stator lamination can be equal to the angle between two adjacent axial measurement groups 10a and radial measurement groups 10b, or an integer multiple of the angle between two adjacent axial measurement groups 10a and radial measurement groups 10b. Because the axial measurement group 10a and radial measurement group 10b may not be independent of each other, there may be cases where the axial measurement group 10a and radial measurement group 10b intersect (e.g., ...). Figure 3 As shown in the diagram, the arrangement of stator teeth 102 can be determined based on the angle between adjacent measuring teeth (adjacent double-layer stator teeth, adjacent single-layer stator teeth, or adjacent double-layer stator teeth and single-layer stator teeth). The specific distribution of stator teeth 102 can be designed according to actual needs. The arrangement of stator teeth 102 in stator laminations is not limited to the examples above. Those skilled in the art may make other changes based on the technical essence of the embodiments in this specification. However, as long as the functions and effects achieved are the same as or similar to those in the embodiments of this specification, they should all be covered within the protection scope of the embodiments of this specification.

[0045] In this embodiment, multiple axial measurement groups 10a and radial measurement groups 10b can be uniformly distributed along the yoke 101. That is, the stator core 100 formed by the circumferentially staggered superposition of two layers of stator laminations can be a radially symmetrical structure. The angle between adjacent double-layer stator teeth, adjacent single-layer stator teeth, or adjacent double-layer stator teeth and single-layer stator teeth can be the same, thereby uniformly forming radial and axial magnetic circuits. Of course, it is understood that forming gaps at specific positions can also achieve axial and radial displacement detection, such as gaps at 0 degrees, 180 degrees, etc. The specific location can be determined according to the actual situation, and this embodiment does not limit this.

[0046] In this embodiment, the number of stator teeth 102 in each stator lamination can be designed according to the actual size. For example, it can include 3N stator teeth, 4N stator teeth, 5N stator teeth, etc., where N is a positive integer greater than or equal to 1. The specific N can be determined according to the actual situation. This embodiment of the specification does not limit this.

[0047] In this embodiment, the angle of circumferential misalignment between the first stator lamination 110 and the second stator lamination 120 can be an integer multiple of the angle between two adjacent stator teeth 102, such as 1 time, 2 times, etc. Of course, it can be other possible angles. Specifically, it can be determined according to the specific arrangement of the stator teeth 102 on the stator lamination. This embodiment of the specification does not limit this.

[0048] From the above description, it can be seen that the embodiments of this specification achieve the following technical effects: The stator core can contain two layers of stator laminations with the same structure, eliminating the need for multiple different stator lamination molds, simplifying the manufacturing and installation process. Furthermore, the double-layer structure effectively reduces the axial dimension, making the entire displacement sensor structure more compact, which is beneficial for reducing the axial length of the magnetic levitation motor rotor, thereby increasing the maximum speed of the magnetic levitation motor. Each layer of stator laminations can have an annular yoke and multiple stator teeth extending radially along the inner wall of the yoke. The stator teeth on a single layer of stator laminations can be unevenly distributed circumferentially, allowing two different stator tooth combinations to be formed after the two layers of stator laminations are staggered and superimposed circumferentially. The double-layer stator teeth can be used to detect radial displacement, while the single-layer stator teeth can be used to detect axial displacement, thus integrating the axial displacement sensor and the radial displacement sensor into one unit. Furthermore, multiple axial and radial measurement groups can be evenly and spaced along the yoke. Arranging the axial and radial measurement groups independently can prevent the axial and radial magnetic circuits from intersecting, thus avoiding mutual interference between axial and radial signals and ensuring the stability of the magnetic levitation system control.

[0049] In one embodiment, the stator lamination may have multiple sets of stator teeth, each set of stator teeth containing 3m stator teeth, where m is a positive integer greater than 0.

[0050] In this embodiment, based on the distribution of the stator teeth 102, the stator teeth 102 on the stator lamination can be divided into multiple groups. The number of stator teeth in each group can be the same or different. In some embodiments, to make the structure simple and easy to install, the number of stator teeth in each group can be designed to be the same.

[0051] In this embodiment, the number of stator teeth in each group can be determined based on the number of teeth designed for forming the axial and radial magnetic circuits in the axial measurement group 10a and radial measurement group 10b. For example, in the case where two double-layer stator teeth form the radial measurement group 10b and two axially staggered single-layer stator teeth form the axial measurement group 10a, each group of stator teeth can contain 3m stator teeth, where m is a positive integer greater than 0. Preferably, m can be equal to 1, but it can also be other possible values. In other embodiments, each group of stator teeth can contain 6 or 4 stator teeth, and the specific design can be based on actual conditions. This specification does not limit this embodiment.

[0052] In one embodiment, the stator teeth in each group of stator teeth can be spaced apart by X degrees, and the stator teeth in two adjacent groups of stator teeth can be spaced apart by 2X degrees. The two layers of stator laminations are stacked together with the stator core 100 being staggered by X degrees in the circumferential direction.

[0053] In this embodiment, the staggered stacking angle can be determined based on the angle between two adjacent stator teeth. The multiple stator teeth in each group can be evenly distributed, and the angle between two adjacent stator teeth can be X degrees. To ensure that the staggered stacking of the two stator laminations allows for some axial positions to have only one layer of stator teeth, the angle between each group of stator teeth can be different from the angle between two adjacent stator teeth in each group, for example, 2X degrees, 3X degrees, 4X degrees, etc.

[0054] In this embodiment, when each group of stator teeth contains three stator teeth, to ensure that the radial measurement group 10b contains two double-layer stator teeth and the axial measurement group 10a contains two single-layer stator teeth with staggered axial positions, adjacent groups of stator teeth can be spaced 2X degrees apart. Of course, the arrangement of stator teeth is not limited to the examples above. Those skilled in the art, inspired by the technical essence of the embodiments in this specification, may make other modifications, but as long as the functions and effects achieved are the same as or similar to those in the embodiments of this specification, they should all be covered within the protection scope of the embodiments of this specification.

[0055] In this embodiment, the angle X can be calculated and determined based on the total number of double-layer stator teeth and single-layer stator teeth after the desired misalignment and superposition. For example, when the total number of double-layer stator teeth and single-layer stator teeth after misalignment and superposition is 12, X = 360° / 12 = 30°.

[0056] In one embodiment, the stator lamination may have 4N sets of stator teeth, where N is a positive integer greater than 0.

[0057] In this embodiment, taking into account the accuracy requirements of displacement detection, the ease of manufacturing and installation, and the overall symmetry, the stator lamination can be designed to have 4N sets of stator teeth. If N is too small, the detection accuracy will not meet the requirements. Therefore, N can be determined according to the volume of the equipment, and can be a value such as 2, 3, 6, or 7. The specific value can be determined according to the actual situation. This embodiment does not limit this.

[0058] In some embodiments, the stator laminations may also be designed to have 3N sets of stator teeth or 5N sets of stator teeth, etc. The specific design can be determined according to the actual situation, and the embodiments in this specification do not limit this.

[0059] In one embodiment, the stator core 100 may include a first stator lamination 110 and a second stator lamination 120 with identical structures. Each axial measurement group 10a includes at least one single-layer stator tooth located on the first stator lamination 110 and one single-layer stator tooth located on the second stator lamination 120. Each radial measurement group 10b includes at least two double-layer stator teeth. The axial measurement group 10a and the radial measurement group 10b are arranged alternately in sequence.

[0060] In this embodiment, as Figure 4 As shown, each axial measurement group 10a may contain two single-layer stator teeth that are axially misaligned to cooperate with the winding to form an axial magnetic circuit, and each radial measurement group 10b may contain two double-layer stator teeth to cooperate with the winding to form a radial magnetic circuit. It is understood that each axial measurement group 10a and each radial measurement group 10b may also contain more single-layer and double-layer stator teeth, such as four or six, etc. The specific number can be determined according to the actual situation, and this specification does not limit this aspect.

[0061] In this embodiment, the axial measurement group 10a and the radial measurement group 10b can be arranged in an overlapping or independently spaced manner. For example... Figure 3 As shown, the staggered arrangement of the axial measurement group 10a and the radial measurement group 10b can lead to the intersection of the axial and radial magnetic circuits, easily causing mutual interference between signals. The distortion of the displacement sensor signal can affect the stability of the magnetic levitation control system, thereby reducing its reliability. Therefore, as... Figure 4 As shown, the axial measurement group 10a and the radial measurement group 10b can be arranged independently in separate sections, so there is no problem of intersection between the axial magnetic circuit and the radial magnetic circuit, avoiding mutual interference between the axial and radial signals and ensuring the stability of the magnetic levitation system control.

[0062] In one embodiment, the integrated axial and radial displacement sensor S may further include: a first axial detection coil, a second axial detection coil, and a plurality of radial detection coils. In each radial measurement group 10b, the radial detection coil is wound in series on each of the double-layer stator teeth. In each axial measurement group 10a, the first axial detection coil is wound in series on the single-layer stator teeth located on the first stator lamination 110. In each axial measurement group 10a, the second axial detection coil is wound in series on the single-layer stator teeth located on the second stator lamination 120.

[0063] In this embodiment, each radial measurement group 10b is wound separately, and a radial detection coil is wound in series on each double-layer stator tooth in each radial measurement group 10b. The single-layer stator tooth located in the first stator lamination 110 in each axial measurement group 10a is wound separately, and the single-layer stator tooth located in the second stator lamination 120 in each axial measurement group 10a is wound separately.

[0064] In one embodiment, the axial-radial integrated displacement sensor S may further include: a winding frame 200 having a radially extending through hole 210 for fitting the stator teeth 102, a wire groove 220 for winding a coil being provided on the outer periphery of the through hole, and a radially extending snap-fit ​​portion 230 for clamping the yoke of the stator core 100 at one end of the through hole.

[0065] In this embodiment, because the thickness of the single-layer stator teeth is different from that of the double-layer stator teeth, two different sizes of winding bobbins 200 are required. Therefore, as... Figure 5 As shown, the stator laminations may also include short teeth with even shorter radial lengths. These short teeth are not used for measurement but only for fixing. The short teeth, in conjunction with the aforementioned single-layer stator teeth, result in the same thickness near the yoke 101 as the double-layer stator teeth, allowing the use of a winding bobbin 200 of the same size, thus simplifying the manufacturing and installation processes.

[0066] Figure 5 The addition of short teeth, while unifying the winding skeleton, reduces the sensitivity of axial displacement monitoring. Furthermore, the closer the length of the short teeth is to that of the long teeth, the lower the sensitivity of axial displacement monitoring becomes.

[0067] In this embodiment, a unified winding skeleton 200 is proposed that can be fixed to both double-layer stator teeth and single-layer stator teeth, compared to... Figure 5 This solution avoids the need for a short tooth to fix the winding during axial alignment of the axial measuring teeth, thus ensuring the sensitivity of the displacement sensor. Furthermore, using a standardized winding bobbin effectively reduces costs and the risk of using the wrong bobbin during manufacturing.

[0068] In this embodiment, the winding bobbin 200 is as follows: Figure 7 As shown, the through hole 210 can match the shape and size of the double-layer stator teeth. When fixed, the stator teeth 102 can penetrate the through hole 210. The stator teeth 102 and the through hole 210 can be fixed by interference fit or by adhesive application, or other possible structural components can be used to enhance the fixing strength of the two. This specification does not limit this.

[0069] In this embodiment, the size and shape of the wire groove 220 are determined according to the coil to be wound, and this embodiment of the specification does not limit this.

[0070] In this embodiment, since the single-layer stator teeth cannot be reliably fixed using only the through hole 210, a snap-fit ​​portion 230 extending toward the yoke of the stator core 100 can be provided at one end of the through hole 210. The snap-fit ​​portion 230 is used to snap onto both sides of the yoke of the stator core 100 along the axial direction, thereby stably fixing the winding bobbin 200 onto the stator core 100. A schematic diagram of the winding bobbin 200 snapped onto the yoke of the stator core 100 can be shown as follows. Figure 8 As shown in the image.

[0071] In this embodiment, the first snap-fit ​​piece 231 and the second snap-fit ​​piece 232 can be structures extending from the inner wall surface of the through hole 210 or structures extending from the outer wall surface of the winding frame 200. The snap-fit ​​portion 230 may include the first snap-fit ​​piece 231 and the second snap-fit ​​piece 232 that are axially opposite each other. The first snap-fit ​​piece 231 may be disposed on one side of the winding frame 200 along the axial direction, and the second snap-fit ​​piece 232 may be disposed on the other side of the winding frame 200 along the axial direction, thereby clamping the yoke of the stator core 100 in the axial direction.

[0072] In this embodiment, the first snap-fit ​​piece 231 and the second snap-fit ​​piece 232 can be rectangular, square, circular, semi-circular or other possible shapes. The shapes of the first snap-fit ​​piece 231 and the second snap-fit ​​piece 232 can be the same or different, and this embodiment does not limit this.

[0073] In this embodiment, the areas of the first snap-fit ​​piece 231 and the second snap-fit ​​piece 232 can be designed according to the size of the yoke of the stator core 100 to ensure reliable fixation and prevent them from falling off during shaking. The first snap-fit ​​piece 231 and the second snap-fit ​​piece 232 can be interference-fitted with the yoke of the stator core 100, or the connection strength can be strengthened by methods such as adhesive fixation. The specific choice can be made according to the actual situation, and this embodiment does not limit this. Thus, the winding frame 200 can clamp the stator core 100 in the axial direction and also clamp the stator teeth 102 in the tooth width direction, thereby reliably fixing the winding frame 200.

[0074] In this embodiment, the above-mentioned snap-fit ​​part 230 can also be other possible fixing structures, such as: buckle, hook and other structures. Of course, the snap-fit ​​part 230 is not limited to the above examples. Those skilled in the art may make other changes under the guidance of the technical essence of the embodiments of this specification. However, as long as the function and effect it achieves are the same as or similar to the embodiments of this specification, they should all be covered within the protection scope of the embodiments of this specification.

[0075] like Figure 9 The three-layer winding bobbin shown requires two types, increasing the number of molds needed, manufacturing costs, and process complexity. Furthermore, the axial leads of the three-layer structure are closely adjacent axially, requiring manual separation of the eight wires from the four axial teeth during welding, increasing the risk of incorrect welding and workload. The dense lead-out wires also prevent automated welding. In contrast, this solution uses a double-layer stator lamination structure, reducing the number of lead-out wires required for the winding, increasing the spacing and quantity of axial leads, and using a standardized winding bobbin further effectively avoids welding errors, enabling automated welding.

[0076] In one embodiment, in a normal-sized industrial device, setting 12 stator teeth on the stator lamination can achieve integrated axial and radial displacement detection with minimal volume while ensuring detection accuracy. If the measurement is performed in a larger industrial device, more teeth can be set, thereby improving the accuracy of axial and radial displacement detection without increasing the difficulty of winding.

[0077] The above method will be described below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustrating the embodiments of this specification and does not constitute an improper limitation on the embodiments of this specification.

[0078] This utility model provides an integrated axial and radial displacement sensor S, which can be applied to industrial equipment such as magnetic levitation compressors and molecular pumps. Figure 4 As shown, the entire structure can be divided into two layers along the axial direction: the first stator lamination 110 and the second stator lamination 120. After the first stator lamination 110 and the second stator lamination 120 are stacked, the number of double-layer stator teeth and single-layer stator teeth can be matched in various ways. The number of double-layer stator teeth can be 4*2N, and the number of single-layer stator teeth is 4*2N, where N is a positive integer greater than or equal to 1.

[0079] In one specific embodiment, the first stator lamination 110 and the second stator lamination 120 can each be provided with 12 stator teeth, with 3 stator teeth forming a group, each group spaced 45° apart, and adjacent stator teeth within a group spaced 22.5° apart. The first stator lamination 110 and the second stator lamination 120 are stacked circumferentially offset by 22.5° to form two combinations of stator teeth. The double-layer stator teeth used for radial displacement monitoring are tightly packed axially, while the two single-layer teeth used for axial displacement monitoring are offset by a height axially. The angles are evenly distributed according to the number of teeth, and the windings on each stator tooth are universal. On the circumference of the yoke 101, the teeth are arranged in a cyclic pattern of two full radial teeth and two half axial teeth.

[0080] Compared to Figure 1 The displacement sensor shown has an axial three-layer structure. In this embodiment, the double-layer structure has a smaller axial dimension. In high-speed magnetic levitation motors, a smaller axial dimension results in a higher achievable maximum speed, effectively enhancing product competitiveness. The double-layer winding frame, through its clamping design, allows for the use of a standardized winding frame, reducing mold costs and the risk of errors during processing. Furthermore, while the three-layer structure has numerous and closely spaced welding points for its four axial windings and eight leads, the double-layer structure has fewer axial windings, reducing welding workload and the risk of welding errors, and also allowing for automated welding. Figure 3 The radial and axial staggered arrangement shown can lead to the intersection of axial and radial magnetic circuits, which can easily cause mutual interference of signals and affect the stability of the magnetic levitation control system. Therefore, in this embodiment, the axial and radial magnetic circuits are arranged independently in separate sections, eliminating the problem of magnetic circuit intersection and effectively avoiding mutual interference between axial and radial signals, thus ensuring the stability of the magnetic levitation system control.

[0081] This utility model also proposes a magnetic levitation compressor, which includes an integrated axial and radial displacement sensor S. The specific structure of the integrated axial and radial displacement sensor S is as described in the above embodiments. Since this magnetic levitation compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0082] It should be understood that the above description is for illustrative purposes and not for limitation. Many implementations and applications beyond the provided examples will become apparent to those skilled in the art upon reading the above description. Therefore, the scope of the embodiments in this specification should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents.

[0083] The above description is merely a preferred embodiment of the embodiments in this specification and is not intended to limit the embodiments in this specification. For those skilled in the art, various modifications and variations can be made to the embodiments in this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments in this specification should be included within the protection scope of the embodiments in this specification.

Claims

1. A shaft radial integrated displacement sensor, characterized by, The application relates to a stator core and a winding framework. The stator core comprises two layers of stator laminations with the same structure, and the stator laminations have at least a ring-shaped yoke and a plurality of stator teeth with the same size extending radially on the inner wall surface of the yoke, and the stator teeth are unevenly arranged in the circumferential direction. The two layers of the stator laminations are stacked in the circumferential direction to form a plurality of axial measurement groups and radial measurement groups which are uniformly spaced in the circumferential direction of the yoke, each axial measurement group comprises single-layer stator teeth for measuring axial displacement, and each radial measurement group comprises double-layer stator teeth for measuring radial displacement.

2. The shaft radial integrated displacement sensor of claim 1, wherein, The stator laminations have a plurality of groups of stator teeth, each group of stator teeth comprises 3m stator teeth, and m is a positive integer greater than 0.

3. The shaft radial integrated displacement sensor of claim 2, wherein, The interval between two adjacent stator teeth in each group of stator teeth is X degrees, the interval between two adjacent groups of stator teeth is 2X degrees, and the two layers of the stator laminations are stacked in the circumferential direction with an offset of X degrees to form the stator core.

4. The shaft radial integrated displacement sensor according to claim 2 or 3, wherein The stator laminations have 4N groups of stator teeth, and N is a positive integer greater than 0.

5. The shaft radial integrated displacement sensor of claim 1, wherein, The stator core comprises first stator laminations and second stator laminations with the same structure, each axial measurement group comprises at least one single-layer stator tooth located on the first stator laminations and one single-layer stator tooth located on the second stator laminations, and each radial measurement group comprises at least two double-layer stator teeth, and the axial measurement groups and the radial measurement groups are arranged in sequence with intervals.

6. The shaft radial integrated displacement sensor of claim 5, wherein, The application further comprises a first axial detection coil, a second axial detection coil and a plurality of radial detection coils, the radial detection coils are wound in sequence on the double-layer stator teeth in each radial measurement group in series, the single-layer stator teeth located on the first stator laminations in each axial measurement group are wound in sequence to form the first axial detection coil in series, and the single-layer stator teeth located on the second stator laminations in each axial measurement group are wound in sequence to form the second axial detection coil in series.

7. The shaft radial integrated displacement sensor of claim 1, wherein, The lengths of the stator teeth in the stator laminations are the same.

8. The shaft radial integrated displacement sensor of claim 1, wherein, The application further comprises a winding framework. The winding framework has a through hole extending radially for sleeving a stator tooth, the outer periphery of the through hole is provided with a wire slot for winding a coil, and one end of the through hole has a clamping portion extending radially for clamping the yoke of the stator core.

9. The shaft radial integrated displacement sensor of claim 8, wherein, The clamping portion comprises first and second clamping pieces opposite in the axial direction, and the first and second clamping pieces are clamped in interference on the yoke of the stator core.

10. A magnetic levitation compressor characterized by, The application relates to a shaft-radial integrated displacement sensor. The shaft-radial integrated displacement sensor is any one of claims 1-9.

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