A sensor assembly and sensor unit for magnetic suspension system

Abstract

The present invention discloses a sensor assembly and a sensor unit for a magnetic suspension system, so as to solve the technical problem that the sensor units of the current sensor assembly for the magnetic suspension system have different sensor appearance structures according to their respective functions. The sensor assembly comprises: a support member and a sensor group, wherein the positioning portion of the sensor unit of the sensor group has two installation modes; when the positioning portion is matched and connected with the corresponding sensor unit positioning installation structure through the first installation mode, the sensor unit will be used as a radial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in a radial direction; when the positioning portion is matched and connected with the corresponding sensor unit positioning installation structure through the second installation mode, the sensor unit will be used as an axial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in an axial direction.

Description

Technical Field

[0001] The invention relates to a sensor assembly for a magnetic suspension system and a sensor unit thereof. Background Art

[0002] In an electromagnetic magnetic suspension system such as a magnetic suspension motor using an electromagnetic magnetic suspension bearing, in order to control the electromagnetic magnetic suspension radial bearing and the electromagnetic magnetic suspension axial bearing (electromagnetic magnetic suspension thrust bearing), it is necessary to detect the radial position and axial position of the rotating shaft supported by the electromagnetic magnetic suspension system through a sensor assembly. At present, the sensor unit used in the sensor assembly is mainly an eddy current sensor. A large number of sensor units (eddy current sensors) are installed on a sensor assembly, which includes a plurality of eddy current sensors for detecting the positions of the rotating shaft supported by the electromagnetic magnetic suspension system in different radial directions, and an eddy current sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in the axial direction. These eddy current sensors have different sensor appearance structures according to their respective functions, thereby increasing the manufacturing and use costs of the sensor assembly. In addition, the existing eddy current sensor adopts a linear thread type, which is inconvenient to install and position, and requires a large installation space. Summary of the invention

[0003] The object of the present invention is to provide a sensor assembly and a sensor unit for a magnetic levitation system, so as to solve the technical problem that the sensor units of the sensor assembly currently used in the magnetic levitation system have different sensor appearance structures according to their respective functions, thereby increasing the manufacturing and use costs of the sensor assembly.

[0004] In the first aspect, a sensor assembly for a magnetic levitation system is provided, comprising: a support member, on which a plurality of sensor unit positioning and mounting structures are provided, each sensor unit positioning and mounting structure being used to position and mount a sensor unit; and a sensor group, the sensor group comprising a plurality of sensor units, the sensor unit comprising a positioning portion for cooperating and connecting with the sensor unit positioning and mounting structure and a detection portion installed in the positioning portion, the positioning portion having two installation modes; when the positioning portion is cooperating and connected with the corresponding sensor unit positioning and mounting structure through a first installation mode, the sensor unit will serve as a radial position sensor for detecting the position of a rotating shaft supported by the electromagnetic magnetic levitation system in a radial direction; when the positioning portion is cooperating and connected with the corresponding sensor unit positioning and mounting structure through a second installation mode, the sensor unit will serve as an axial position sensor for detecting the position of a rotating shaft supported by the electromagnetic magnetic levitation system in an axial direction.

[0005] Furthermore, the sensor unit positioning and mounting structure is a positioning groove provided on the support member, and the positioning groove has a groove bottom surface and a groove side surface; the positioning portion has a first positioning plane, a second positioning plane and a third positioning plane that are not coplanar, and the detection end of the detection portion is fixed on the third positioning plane; when the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through a first installation method, the first positioning plane is matched with the groove bottom surface, and the second positioning plane is matched with the groove side surface; when the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through a second installation method, the first positioning plane is matched with the groove side surface, and the second positioning plane is matched with the groove bottom surface.

[0006] Furthermore, the detection portion is an L-shaped shaft component, and a central axis of the L-shaped shaft component is parallel to the first positioning plane.

[0007] Furthermore, the positioning portion includes a rectangular shell and a positioning protrusion arranged on the rectangular shell, the surface of the rectangular shell has a non-coplanar first plane and a second plane, the first plane serves as the first positioning plane, the second plane serves as the second positioning plane, and the positioning protrusion is arranged on the second plane and has a third positioning plane parallel to the second plane.

[0008] Furthermore, the rectangular housing is provided with a connection hole avoiding the L-shaped shaft-shaped component, and the rectangular housing is installed in the positioning groove through a connection piece adapted to the connection hole. The connection piece can be a bolt or a screw.

[0009] Furthermore, the connecting hole is perpendicular to the first plane; when the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through the second installation method, the first positioning plane is matched with the side surface of the groove through the insert, and the insert is fixed to the bottom surface of the groove on the one hand and fixed to the rectangular shell through the connecting piece on the other hand.

[0010] In a second aspect, a sensor unit is provided, which is a sensor unit in a sensor assembly for a magnetic levitation system according to the first aspect.

[0011] The rectangular housing and the positioning protrusion may be an integrally machined part. In addition, a sealant may be filled between the positioning protrusion and the detection part.

[0012] Since the sensor unit includes a positioning portion for cooperating and connecting with the sensor unit positioning and mounting structure and a detection portion installed in the positioning portion, the positioning portion has two installation methods. When the positioning portion is cooperating and connected with the corresponding sensor unit positioning and mounting structure through the first installation method, the sensor unit will be used as a radial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in a radial direction. When the positioning portion is cooperating and connected with the corresponding sensor unit positioning and mounting structure through the second installation method, the sensor unit will be used as an axial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in an axial direction. In this way, the same sensor unit can become a radial position sensor or an axial position sensor by selecting one of the two installation methods, that is, it is no longer necessary for the sensor unit itself to distinguish whether it is a radial position sensor or an axial position sensor, which helps to reduce the manufacturing and use costs of the sensor assembly.

[0013] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting part of this specification are used to assist in understanding the present application. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present application, but do not constitute improper limitations on the present application. In the drawings:

[0015] Figure 1 It is a schematic structural diagram of a sensor assembly for a magnetic levitation system according to an embodiment of the application.

[0016] Figure 2 for Figure 1 A schematic diagram of the reverse structure of a sensor assembly for a magnetic levitation system is shown.

[0017] Figure 3 for Figure 1 Schematic diagram of the structure of the sensor unit.

[0018] Figure 4 for Figure 3 Schematic diagram of the reverse structure of the sensor unit shown. DETAILED DESCRIPTION

[0019] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0020] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0021] The embodiments of the present invention involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0022] The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0023] Figure 1 It is a schematic structural diagram of a sensor assembly for a magnetic levitation system according to an embodiment of the application. Figure 2 for Figure 1 A schematic diagram of the reverse structure of a sensor assembly for a magnetic levitation system is shown. Figure 3 for Figure 1 Schematic diagram of the structure of the sensor unit. Figure 4 for Figure 3 The reverse side structure diagram of the sensor unit is shown in FIG. Figure 1-Figure 4 As shown, a sensor assembly for a magnetic suspension system includes a support 1 and a sensor group 2. The support 1 is provided with a plurality of sensor unit positioning and mounting structures, each of which is used to position and mount a sensor unit 21. The sensor group includes a plurality of sensor units 21, and the sensor unit 21 includes a positioning portion 211 for cooperating and connecting with the sensor unit positioning and mounting structure and a detection portion 212 installed in the positioning portion 211, and the positioning portion 211 has two installation modes. When the positioning portion 211 is matched and connected with the corresponding sensor unit positioning and mounting structure through the first installation mode, the sensor unit 21 will be used as a radial position sensor for detecting the position of a rotating shaft supported by the electromagnetic magnetic suspension system in a radial direction; when the positioning portion 211 is matched and connected with the corresponding sensor unit positioning and mounting structure through the second installation mode, the sensor unit 21 will be used as an axial position sensor for detecting the position of a rotating shaft supported by the electromagnetic magnetic suspension system in an axial direction.

[0024] Since the sensor unit 21 includes a positioning portion 211 for cooperating and connecting with the sensor unit positioning and mounting structure and a detection portion 212 installed in the positioning portion 211, the positioning portion 211 has two installation methods. When the positioning portion 211 is coordinated and connected with the corresponding sensor unit positioning and mounting structure through the first installation method, the sensor unit 21 will be used as a radial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in a radial direction. When the positioning portion 211 is coordinated and connected with the corresponding sensor unit positioning and mounting structure through the second installation method, the sensor unit will be used as an axial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in an axial direction. In this way, the same sensor unit 21 can become a radial position sensor or an axial position sensor by selecting one of the two installation methods, that is, it is no longer necessary for the sensor unit 21 itself to distinguish whether it is a radial position sensor or an axial position sensor, which helps to reduce the manufacturing and use costs of the sensor assembly.

[0025] In a preferred embodiment, the sensor unit positioning and mounting structure is a positioning groove 11 opened on the support member 1, and the positioning groove 11 has a groove bottom surface and a groove side surface; the positioning portion 211 has a first positioning plane 211a, a second positioning plane 211b and a third positioning plane 211c that are not coplanar ("non-coplanar" here means not on the same plane), and the detection end 2121 of the detection portion 212 is fixed on the third positioning plane 211c; when the positioning portion 211 is matched and connected with the corresponding sensor unit positioning and mounting structure through the first installation method, the first positioning plane 211a is matched with the groove bottom surface, and the second positioning plane 211b is matched with the groove side surface; when the positioning portion 211 is matched and connected with the corresponding sensor unit positioning and mounting structure through the second installation method, the first positioning plane 211a is matched with the groove side surface, and the second positioning plane 211b is matched with the groove bottom surface.

[0026] Specifically, if Figure 1-Figure 2As shown, the sensor group 2 includes 6 sensor units 21, among which the positioning parts 211 of 4 sensor units 21 are matched and connected with the corresponding sensor unit positioning and mounting structures through the first installation method. At this time, the first positioning planes 211a of the 4 sensor units 21 are respectively matched with the bottom surfaces of the corresponding positioning grooves 11, and the second positioning planes 211b of the 4 sensor units 21 are respectively matched with the side surfaces of the corresponding positioning grooves 11. In this way, the 4 sensor units 21 are respectively used as radial position sensors for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in a radial direction, and the angle between the normals of the detection ends 2121 between two adjacent sensor units 21 in the 4 sensor units 21 is 90°. At the same time, the normals of the detection ends 2121 of the 4 sensor units 21 intersect at the same point (theoretically, this point is the center of the rotating shaft supported by the electromagnetic magnetic suspension system, that is, Figure 1 In addition, the positioning parts 211 of the other two sensor units 21 in the sensor group 2 are matched and connected with the corresponding sensor unit positioning and mounting structure through the second installation method. At this time, the first positioning planes 211a of the two sensor units 21 are respectively matched with the groove side surfaces of the corresponding positioning grooves 11, and the second positioning planes 211b of the two sensor units 21 are respectively matched with the groove bottom surfaces of the corresponding positioning grooves 11. In this way, the two sensor units 21 are respectively used as axial position sensors for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in the same axial direction, that is, the normals of the detection ends 2121 of the two sensor units 21 are parallel to the rotating shaft (from Figure 2 It can be seen that the detection ends 2121 of the two sensor units 2 point to the axial direction of the annular support member 1).

[0027] In view of the above structure of the sensor unit 21, the detection part 212 is preferably an L-shaped shaft-like component, and the central axis of the L-shaped shaft-like component is parallel to the first positioning plane 211a. This helps to reduce the size of the positioning part 211 and save the space occupied by the sensor unit 21. At the same time, the outgoing line of the detection part 212 follows the circumferential direction of the annular support member 1, which is convenient for wiring.

[0028] In a preferred embodiment, the sensor unit 21 specifically adopts the following structural design: the positioning portion 211 includes a rectangular shell 2111 and a positioning protrusion 2112 arranged on the rectangular shell 2111, the surface of the rectangular shell 2111 has a first plane and a second plane that are not coplanar, the first plane serves as the first positioning plane 211a, the second plane serves as the second positioning plane 211b, and the positioning protrusion 2112 is arranged on the second plane and has a third positioning plane 211c parallel to the second plane. Among them, the rectangular shell 2111 and the positioning protrusion 2112 can be an integral machined molded part. The rectangular shell 2111 and the positioning protrusion 2112 can also be provided with a detection portion installation groove 2113 for installing an L-shaped shaft-shaped component. The positioning protrusion 2112 and the detection portion 212 can be filled with sealant.

[0029] In addition, a connection hole 2114 avoiding the L-shaped shaft-like component may be provided on the rectangular housing 2111, and the rectangular housing 2111 is installed in the positioning groove 11 through a connector adapted to the connection hole 2114. In a preferred embodiment, the connection hole 2114 is perpendicular to the first plane 211a; when the positioning portion 21 is matched and connected with the corresponding sensor unit positioning and mounting structure through the second installation method, the first positioning plane 211a is matched with the side of the groove through the insert 12, and the insert 12 is fixed to the bottom surface of the groove on the one hand and fixed to the rectangular housing 2111 through the connector on the other hand. In this way, whether the sensor unit 21 adopts the first installation method or the second installation method, the same connection hole 2114 can be used.

[0030] The above is a description of the relevant contents of the present application. A person skilled in the art will be able to implement the present application based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of the present application.

Claims

1. A sensor assembly for a magnetic suspension system, characterized in that: include: A support member, wherein a plurality of sensor unit positioning and mounting structures are provided on the support member, and each sensor unit positioning and mounting structure is used for positioning and mounting a sensor unit; as well as A sensor group, wherein the sensor group comprises a plurality of sensor units, wherein the sensor units comprise a positioning portion for cooperating with and connecting to the positioning and mounting structure of the sensor unit and a detection portion mounted in the positioning portion, wherein the positioning portion has two mounting modes; When the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through the first mounting method, the sensor unit will serve as a radial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in a radial direction; When the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through the second mounting method, the sensor unit will serve as an axial position sensor for detecting the position of the rotating shaft supported by the electromagnetic magnetic suspension system in an axial direction; The sensor unit positioning and installation structure is a positioning groove provided on the support member, and the positioning groove has a groove bottom surface and a groove side surface; The positioning portion has a first positioning plane, a second positioning plane and a third positioning plane that are not coplanar, and the detection end of the detection portion is fixed on the third positioning plane; When the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through the first mounting method, the first positioning plane is matched with the bottom surface of the groove, and the second positioning plane is matched with the side surface of the groove; When the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through the second mounting method, the first positioning plane is matched with the side surface of the groove, and the second positioning plane is matched with the bottom surface of the groove.

2. A sensor assembly for a magnetic suspension system according to claim 1, characterized in that: The detection part is an L-shaped shaft component, and the central axis of the L-shaped shaft component is parallel to the first positioning plane.

3. A sensor assembly for a magnetic suspension system as claimed in claim 2, characterized in that: The positioning portion includes a rectangular shell and a positioning protrusion arranged on the rectangular shell. The surface of the rectangular shell has a non-coplanar first plane and a second plane. The first plane serves as the first positioning plane, and the second plane serves as the second positioning plane. The positioning protrusion is arranged on the second plane and has a third positioning plane parallel to the second plane.

4. A sensor assembly for a magnetic suspension system as claimed in claim 3, characterized in that: The rectangular shell is provided with a connecting hole avoiding the L-shaped shaft-like component, and the rectangular shell is installed in the positioning groove through a connecting piece adapted to the connecting hole.

5. A sensor assembly for a magnetic suspension system as claimed in claim 4, characterized in that: The connecting piece is a bolt or a screw.

6. A sensor assembly for a magnetic suspension system as claimed in claim 4, characterized in that: The connecting hole is perpendicular to the first plane; when the positioning portion is matched and connected with the corresponding sensor unit positioning and mounting structure through the second installation method, the first positioning plane is matched with the side surface of the groove through the insert, and the insert is fixed to the bottom surface of the groove on the one hand and fixed to the rectangular shell through the connecting piece on the other hand.

7. A sensor unit, characterized in that: A sensor unit in a sensor assembly for a magnetic suspension system as described in any one of claims 1 to 6.

8. A sensor unit according to claim 7, characterized in that: The rectangular shell and the positioning protrusion are an integrally machined part.

9. A sensor unit according to claim 7, characterized in that: The space between the positioning protrusion and the detection portion is filled with sealant.

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