Motor assembly and CT bulb tube

Abstract

The invention provides a motor assembly and a CT bulb tube. The motor assembly is applied to a CT bulb tube and comprises a support, a rotating shaft, an annular magnet and a stator assembly, the first end of the rotating shaft is rotatably connected with the first end of the support, and the second end of the rotating shaft is configured to be connected with a load; the first end of the support and the first end of the rotating shaft are sleeved with the annular magnet, and the annular magnet is rotationally connected with the support and fixedly connected with the rotating shaft. The stator assembly comprises a stator iron core, and the stator iron core is wound on the peripheral side of the annular magnet. According to the motor assembly provided by the invention, the output torque of the motor assembly can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor assembly and a CT tube. Background Art

[0002] In order to prevent the permanent magnet from separating from the rotor core along the circumference of the rotating shaft, the existing rotor assembly has a protective sleeve on the outer side of the permanent magnet. The provision of the protective sleeve lengthens the air gap between the permanent magnet and the inner diameter of the stator assembly, resulting in a reduction in the output torque of the motor assembly. Summary of the invention

[0003] The present application provides a motor assembly and a CT tube to solve the technical problem of low output torque of the existing motor assembly.

[0004] In order to solve the above technical problems, the present application provides a motor assembly, which is applied to a CT tube. The motor assembly includes a support, a rotating shaft, an annular magnet and a stator assembly. The first end of the rotating shaft is rotatably connected to the first end of the support, and the second end of the rotating shaft is configured to connect to a load; the annular magnet is sleeved outside the first end of the support and the first end of the rotating shaft, and is rotatably connected to the support and fixedly connected to the rotating shaft; the stator assembly includes a stator core, and the stator core is wound around the outer circumference of the annular magnet.

[0005] In one embodiment, the support comprises a magnetically conductive support.

[0006] In one embodiment, the rotating shaft comprises a magnetic rotating shaft.

[0007] In one embodiment, a receiving cavity and a through hole communicating with the receiving cavity are formed at the first end of the support, and the first end of the rotating shaft is disposed in the receiving cavity through the through hole.

[0008] In one embodiment, the motor assembly further includes a filling piece, which is located between the rotating shaft and the cavity wall of the accommodating cavity along the radial direction of the rotating shaft to limit the radial movement of the rotating shaft.

[0009] In one embodiment, the filling member includes a magnetic conductive filling member.

[0010] In one embodiment, the annular magnet includes a first permanent magnet portion and a second permanent magnet portion which are separated and arranged along the circumferential direction of the rotating shaft, wherein the polarities of the first permanent magnet portion and the second permanent magnet portion are different.

[0011] In one embodiment, the motor assembly further includes a bearing, which is disposed in the accommodating cavity, fixedly connected to the support, and rotatably connected to the rotating shaft.

[0012] In order to solve the above technical problems, the present application provides a CT tube, which includes the above-mentioned motor assembly, shielding cover, mounting seat and target plate; the stator assembly is arranged outside the shielding cover, and the support, annular magnet and rotating shaft are arranged inside the shielding cover; the mounting seat is arranged inside the shielding cover, and the first end of the mounting seat in the axial direction is fixedly connected to the rotating shaft and the annular magnet; the target plate is arranged in the shielding cover, and the target plate is sleeved on the second end of the mounting seat in the axial direction.

[0013] In one embodiment, the mounting seat includes a first connecting portion and a second connecting portion, the first connecting portion is formed with a through groove along the axial direction, and a mounting groove is formed on the end surface facing the rotating shaft, the through groove and the mounting groove are arranged at intervals along the radial direction of the rotating shaft, wherein the second end portion of the rotating shaft is arranged in the through groove, the end of the annular magnet in the axial direction is arranged in the mounting groove, and is matched with the stop of the mounting groove; one end of the second connecting portion is arranged in the through groove, and the target plate is sleeved on the other end of the second connecting portion, wherein the second connecting portion is coaxially arranged with the rotating shaft and the first connecting portion.

[0014] The beneficial effects of the present application are as follows: the motor assembly of the present application includes a support, a rotating shaft, an annular magnet and a stator assembly, wherein the annular magnet is sleeved outside the support and the first end of the rotating shaft, and is located between the first end of the support and the stator core, that is, the rotor of the present application only includes an annular magnet, and the outer diameter of the annular magnet may not be restricted by additional rotor components, so that the outer diameter of the annular magnet can be designed to be larger, so that the rotor flux is larger, and thus the output torque of the motor assembly can be increased, and the working efficiency of the motor assembly can be improved. In addition, the rotor only includes annular magnets, which can reduce the cost of the motor assembly, and at the same time, the assembly process of the motor assembly is simplified, which can reduce the difficulty of assembling the motor assembly. In addition, the annular magnet is fixedly connected to the rotating shaft, which can reduce the probability of the annular magnet being thrown away and enhance the reliability of the motor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 It is a structural schematic diagram of an embodiment of a CT tube provided by the present application;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of an embodiment of a CT tube provided in the present application.

[0018] Figure numerals: 10—CT tube; 100—shielding cover; 200—mounting seat; 210—first connecting part; 220—second connecting part; 310—support; 320—annular magnet; 330—rotating shaft; 340—filling piece; 350—bearing; 360—stator core; 400—target plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0022] Computed Tomography (CT) equipment is used to perform cross-sectional scanning of internal tissues and organs of the human body. It is an important and frequently used medical device. The CT tube is the core component of the CT equipment and is also a consumable item. In the currently commonly used CT tubes, the rotor assembly of the motor is generally sealed in a vacuum tube together with the bearing, and then assembled with the rotating anode. The currently commonly used CT tube motor assembly uses an induction motor (i.e., an asynchronous motor). The induction motor has a simple and reliable structure and is widely used in current CT tubes. However, induction motors have problems such as low efficiency and low power factor.

[0023] In order to solve the above technical problems, the present application provides a motor assembly applied to a CT tube, the motor assembly is a synchronous motor, and the motor assembly can improve the torque output and improve the working efficiency of the motor assembly. Figure 1 , Figure 1 is a structural schematic diagram of an embodiment of a CT tube provided by the present application, Figure 2 1 is a schematic diagram of a cross-sectional structure of an embodiment of a CT tube provided by the present application, wherein the CT tube 10 comprises a shielding cover 100, a motor assembly (not marked in the figure), a mounting seat 200 and a target plate 400. Part of the structure of the motor assembly, the mounting seat 200 and the target plate 400 are located in the shielding cover 100. The motor assembly is used to drive the target plate 400 to rotate at a high speed. The shielding cover 100 is used to provide a vacuum environment. The target plate 400 is fixedly connected to the motor assembly through the mounting seat 200.

[0024] Specifically, the motor assembly includes a support 310 , a rotating shaft 330 , an annular magnet 320 and a stator assembly (not marked in the figure), wherein the support 310 , the rotating shaft 330 , and the annular magnet 320 are arranged inside the shielding cover 100 ; and the stator assembly is arranged outside the shielding cover 100 .

[0025] The stator assembly includes a stator core 360, and the stator assembly is used to provide a stable rotating magnetic field. The stator assembly can be a single-phase or multi-phase stator assembly, which is not limited here.

[0026] The first end of the rotating shaft 330 is rotatably connected to the first end of the support 310, and the second end of the rotating shaft 330 is configured to connect to a load, for example, the load may be a target plate 400, and in other embodiments, the load may be other equipment to be rotated, which is not limited here. Specifically, the first end of the mounting base 200 in the axial direction is fixedly connected to the rotating shaft 330 and the annular magnet 320.

[0027] The annular magnet 320 is sleeved outside the first end of the support 310 and the first end of the rotating shaft 330, and is rotatably connected to the support 310, and is fixedly connected to the rotating shaft 330. The annular magnet 320 and the rotating shaft 330 may be fixedly connected directly, or indirectly fixedly connected through other components, which is not limited here. The rotating shaft 330 is fixedly connected to the annular magnet 320, and as the rotating part of the present application, is rotatably connected to the support 310.

[0028] The motor assembly of the present application includes a support 310, a rotating shaft 330, an annular magnet 320 and a stator assembly, wherein the annular magnet 320 is sleeved outside the support 310 and the first end of the rotating shaft 330, and is located between the first end of the support 310 and the stator core 360, that is, the rotor of the present application only includes the annular magnet 320, and the outer diameter of the annular magnet 320 may not be restricted by additional rotor components, so that the outer diameter of the annular magnet 320 can be designed to be larger, so that the rotor flux is larger, and then the output torque of the motor assembly can be increased, and the working efficiency of the motor assembly can be improved. In addition, the rotor only includes the annular magnet 320, which can reduce the cost of the motor assembly, and at the same time, the assembly process of the motor assembly is simplified, which can reduce the assembly difficulty of the motor assembly. In addition, the annular magnet 320 is fixedly connected to the rotating shaft 330, which can reduce the probability of the annular magnet 320 being thrown away and enhance the reliability of the motor assembly.

[0029] In one embodiment, the annular magnet 320 includes a first permanent magnet portion (not marked in the figure) and a second permanent magnet portion (not marked in the figure) which are arranged in isolation along the circumference of the annular magnet 320, and the polarities of the first permanent magnet portion and the second permanent magnet portion are different. For example, the polarity of the first permanent magnet portion is an S pole or an N pole, and the corresponding second permanent magnet portion is an N pole or an S pole. Among them, the first permanent magnet portion and the second permanent magnet portion are arranged in isolation, which means that there is a body without a magnetic conductivity function between the first permanent magnet portion and the second permanent magnet portion. The first permanent magnet portion and the second permanent magnet portion form a group of motor pole pairs, and the number of the first permanent magnet portion and the second permanent magnet portion on the annular permanent magnet can be set according to the output demand of the motor torque, which is not limited here. The annular magnet 320 of this embodiment does not require additional magnetic isolation components, which can reduce the difficulty of assembling the motor assembly and reduce the cost of the motor assembly.

[0030] In one embodiment, along the circumference of the annular magnet 320, a protrusion (not marked in the figure) and a recess (not marked in the figure) are formed on the outer surface of the annular magnet 320, the protrusion can be the first permanent magnet part or the second permanent magnet part, and the recess is a body without a magnetic conductivity function. Among them, the distance between the centerline position of the surface of the protrusion and the inner diameter of the stator core 360 ​​is the smallest, and the distance between the centerline and the inner diameter of the stator core 360 ​​along the circumference of the annular magnet 320 is gradually increased to change the air gap between the outer diameter of the first permanent magnet part and the second permanent magnet part and the stator core 360, and adjust the output torque of the motor assembly.

[0031] In one embodiment, a through hole and a receiving cavity connected to the through hole are formed at the first end of the support 310, and the first end of the rotating shaft 330 is disposed in the receiving cavity through the through hole to enhance the stability of the rotation connection between the support 310 and the rotating shaft 330, thereby enhancing the reliability of the motor assembly. The second end of the support 310 is sealed and connected to the shielding cover 100 to ensure a high vacuum environment in the shielding cover 100, thereby enhancing the reliability of the CT tube 10.

[0032] In one embodiment, the support 310 includes a magnetically conductive support. It can be known that the annular magnet 320 is sleeved outside the first end of the support 310. When the support 310 is a magnetically conductive support, it is equivalent to having a magnetic conduction path in the middle of the annular magnet 320, which can reduce the magnetic resistance and improve the efficiency of the motor assembly.

[0033] In one embodiment, the rotating shaft 330 includes a magnetically conductive rotating shaft. It is equivalent to having a magnetic conduction path in the middle of the annular magnet 320, which can achieve the effect of a rotor core. And the thickness of the rotating shaft 330 is not limited by the thickness of the conventional rotor core. When the magnetically conductive rotating shaft is used as the rotor core, it can reduce the magnetic saturation of the magnetic circuit on the rotor core and improve the output torque of the motor assembly.

[0034] In one embodiment, the motor assembly further includes a filling member 340. Along the radial direction of the rotating shaft 330, the filling member 340 is located between the first end of the rotating shaft 330 and the wall of the accommodating cavity. The filling member 340 can limit the relative rotation of the rotating shaft 330 along the radial direction of the rotating shaft 330 with respect to the support 310, and can enhance the reliability of the motor assembly.

[0035] In one embodiment, the filling member 340 includes a magnetically conductive filling member. That is, the filling member 340 has a magnetic conduction function. The magnetically conductive filling member can reduce the magnetic resistance and improve the efficiency of the motor assembly.

[0036] In one embodiment, the motor assembly further includes a bearing 350. The bearing 350 is disposed in the accommodating cavity, fixedly connected to the wall of the accommodating cavity, and rotatably connected to the first end of the rotating shaft 330. In this embodiment, the rotating shaft 330 is rotatably connected to the first end of the support 310 through the bearing 350, making the rotation of the rotating shaft 330 smoother and enhancing the reliability of the motor assembly.

[0037] For example, the motor assembly includes two bearings 350. The two bearings 350 are arranged at intervals along the axial direction of the rotating shaft 330, and the first end of the rotating shaft 330 is rotatably connected to the two bearings 350 respectively.

[0038] In one embodiment, the mounting seat 200 includes a first connecting portion 210 and a second connecting portion 220 that are detachably connected. The first connecting portion 210 is formed with a through groove (not marked in the figure) along the axial direction of the rotating shaft 330, and an installation groove (not marked in the figure) is formed on the end face facing the rotating shaft. The through groove and the installation groove are arranged at intervals along the radial direction of the rotating shaft. Among them, a part of the second end of the rotating shaft 330 is disposed in the through groove, or the end of the rotating shaft 330 is disposed in the through groove. The axial end of the annular magnet 320 is disposed in the installation groove and is arranged in a mating manner with the stop of the installation groove. One end of the second connecting portion is disposed in the through groove, and the target disk is sleeved on the other end of the second connecting portion. Among them, the second connecting portion is coaxial with the rotating shaft and the first connecting portion.

[0039] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A motor assembly, characterized in that: Applied to CT tube, the motor assembly includes: Support; A rotating shaft, wherein a first end of the rotating shaft is rotatably connected to a first end of the support, and a second end of the rotating shaft is configured to be connected to a load; an annular magnet, sleeved on the first end of the support and the first end of the rotating shaft, rotatably connected to the support and fixedly connected to the rotating shaft; The stator assembly comprises a stator core, wherein the stator core is wound around the outer circumference of the annular magnet.

2. The motor assembly according to claim 1, characterized in that: The support includes a magnetic conductive support.

3. The motor assembly according to claim 1, characterized in that: The rotating shaft comprises a magnetic rotating shaft.

4. The motor assembly according to claim 1, characterized in that: A receiving cavity and a through hole communicating with the receiving cavity are formed at the first end of the support, and the first end of the rotating shaft is arranged in the receiving cavity through the through hole.

5. The motor assembly according to claim 4, characterized in that: The motor assembly also includes: A filling piece is located between the rotating shaft and the cavity wall of the accommodating cavity along the radial direction of the rotating shaft to limit the movement of the rotating shaft in the radial direction.

6. The motor assembly according to claim 5, characterized in that: The filling piece includes a magnetic conductive filling piece.

7. The motor assembly according to claim 1, characterized in that The annular magnet includes a first permanent magnet portion and a second permanent magnet portion which are separated and arranged along the circumferential direction of the rotating shaft, wherein the first permanent magnet portion and the second permanent magnet portion have different polarities.

8. The motor assembly according to claim 4, characterized in that: The motor assembly also includes: The bearing is arranged in the accommodating cavity, fixedly connected to the support, and rotatably connected to the rotating shaft.

9. A CT tube, characterized in that: The CT tube comprises: The motor assembly according to any one of claims 1 to 8; A shielding cover, wherein the stator assembly is arranged outside the shielding cover, and the support, the annular magnet and the rotating shaft are arranged inside the shielding cover; A mounting seat, disposed in the shielding cover, wherein a first end of the mounting seat in the axial direction of the rotating shaft is fixedly connected to the rotating shaft and the annular magnet; The target plate is arranged in the shielding cover, and the target plate is sleeved on the second end of the mounting seat in the axial direction.

10. The CT tube according to claim 9, characterized in that: The mounting base comprises: A first connecting portion, wherein a through groove is formed along the axial direction, and a mounting groove is formed on the end surface facing the rotating shaft, wherein the through groove and the mounting groove are spaced apart along the radial direction of the rotating shaft, wherein the second end portion of the rotating shaft is disposed in the through groove, and the end portion of the annular magnet in the axial direction is disposed in the mounting groove and is matched with a stopper of the mounting groove; A second connecting part, one end of which is arranged in the through groove, and the target plate is sleeved on the other end of the second connecting part, wherein the second connecting part is coaxially arranged with the rotating shaft and the first connecting part.

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