Motor assembly and CT tube

Abstract

Provided in the present application are a motor assembly and a CT tube. The motor assembly comprises a stator assembly, a rotating magnetic conductive sleeve, a rotating electrical conductive sleeve and a fixed mandrel, wherein the stator assembly comprises a stator core; the rotating electrical conductive sleeve is sleeved around a first side surface of the rotating magnetic conductive sleeve, and the first side surface is configured to face the stator core; the rotating magnetic conductive sleeve is sleeved around the fixed mandrel, and is rotatably arranged relative to and spaced apart from the fixed mandrel, and the fixed mandrel is configured to connect to a load; and in the radial direction of the fixed mandrel, the projection of the rotating magnetic conductive sleeve on the fixed mandrel covers the projection of the rotating electrical conductive sleeve on the fixed mandrel. The motor assembly provided in the present application can enhance the reliability of the CT tube.

Description

Motor assembly and CT tube

[0001] This application claims priority to Chinese Patent Application No. 202411852899X, filed on December 13, 2024, entitled “Electric Motor Assembly and CT Tube”, the entirety of which is incorporated herein by reference. [Technical Field]

[0002] This application relates to the field of motor technology, and in particular to a motor assembly and a CT tube. [Background Technology]

[0003] A CT tube is a device used to generate X-rays. It primarily utilizes an active electron beam striking an anode, or target disk, at high speed. About 1% of the electrical energy is converted into X-rays, while the remainder is dissipated as heat. The motor assembly within the CT tube controls the high-speed rotation of the target disk. Existing motor assemblies used in CT tubes have long electromagnetic circuit paths, resulting in high eddy current losses. The heat generated by these eddy current losses leads to poor reliability of the CT tube. [Summary of the Invention]

[0004] This application provides a motor assembly and a CT tube to solve the technical problem of poor reliability of existing motor assemblies and CT tubes.

[0005] To address the aforementioned technical problems, this application provides a motor assembly comprising a stator assembly, a rotating magnetic sleeve, a rotating conductive sleeve, and a fixed spindle. The stator assembly includes a stator core. The rotating conductive sleeve is sleeved on a first side of the rotating magnetic sleeve, and the first side is configured to face the stator core. The rotating magnetic sleeve is sleeved on the fixed spindle, rotating relative to and spaced apart from the fixed spindle. The fixed spindle is configured to connect a load. Along the radial direction of the fixed spindle, the projection of the rotating magnetic sleeve on the fixed spindle overlaps the projection of the rotating conductive sleeve on the fixed spindle.

[0006] In one embodiment, one end of the rotating magnetic sleeve is provided with a mounting groove facing one side of the stator assembly, and the rotating conductive sleeve is disposed in the mounting groove; the other end of the rotating magnetic sleeve is configured to connect a load.

[0007] In one embodiment, a sealing arrangement is provided between the rotating magnetic sleeve and the rotating conductive sleeve.

[0008] In one embodiment, the rotating magnetic sleeve and the rotating conductive sleeve are welded together.

[0009] In one embodiment, the rotating magnetic sleeve and the rotating conductive sleeve are sealed together by a sealing element.

[0010] In one embodiment, the rotating magnetic sleeve includes a rotating steel sleeve, the rotating conductive sleeve includes a rotating copper sleeve, and the fixed mandrel includes a fixed steel sleeve.

[0011] In one embodiment, the projection of the rotating conductive sleeve on the fixed mandrel along the radial direction of the fixed mandrel covers the projection of the stator core on the fixed mandrel.

[0012] In one embodiment, the stator core is sleeved on the outside of the rotating conductive sleeve.

[0013] In one embodiment, the fixed mandrel includes a hollow shaft.

[0014] To solve the above-mentioned technical problems, this application provides a CT tube, which includes a shield, a target plate and the aforementioned motor assembly. A rotating magnetic sleeve, a rotating conductive sleeve and a fixed spindle are disposed inside the shield, and a stator assembly is disposed outside the shield. The target plate is disposed inside the shield, sleeved outside the fixed spindle, and fixedly connected to the rotating magnetic sleeve so as to be rotatably connected to the fixed spindle.

[0015] The beneficial effects of this application are as follows: the motor assembly includes a stator assembly, a rotating magnetic sleeve, a rotating conductive sleeve, and a fixed spindle. The stator assembly includes a stator core. The rotating conductive sleeve is fitted over a first side of the rotating magnetic sleeve, and the first side is configured to face the stator core. The rotating magnetic sleeve is fitted over the fixed spindle, rotates relative to the fixed spindle, and is spaced apart. The fixed spindle is configured to connect a load. Along the radial direction of the fixed spindle, the projection of the rotating magnetic sleeve on the fixed spindle covers the projection of the rotating conductive sleeve on the fixed spindle. With the above arrangement, when the motor assembly is used in a CT tube, the magnetic lines of force of the motor assembly of this application sequentially travel through the following paths: the first air gap between the side of the stator core facing the rotating conductive sleeve and the shield of the CT tube, the shield, the second air gap between the shield and the rotating conductive sleeve, the rotating conductive sleeve, and the rotating magnetic sleeve. The magnetic lines of force return sequentially to the stator core after the rotating magnetic sleeve completes the loop, forming a closed circuit. Therefore, the magnetic circuit path of the motor assembly in this application does not need to pass through the air gap between the rotating magnetic sleeve and the fixed spindle, which can shorten the magnetic circuit path and improve the efficiency of the motor assembly. In addition, the rotating magnetic sleeve is located outside the fixed spindle and rotates relative to the fixed spindle, that is, the rotating electromagnetic sleeve rotates relative to the fixed spindle. Because the frequency at which the magnetic field of the stator assembly cuts the rotating magnetic sleeve is lower than the frequency at which it cuts the fixed spindle, that is, the difference between the rotational speed of the rotating magnetic sleeve and the frequency of the rotating magnetic field provided by the stator assembly is only the slip rate, which is a lower frequency, the eddy current loss of the rotating electromagnetic sleeve is smaller, and the heat generation of the rotating electromagnetic sleeve is lower. This can reduce the rate of temperature rise inside the shield, thus extending the working time of the motor assembly and the CT tube, thereby enhancing the reliability of the CT tube. [Attached Image Description]

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 is a first cross-sectional structural schematic diagram of an embodiment of a CT tube provided in this application;

[0018] Figure 2 is a schematic diagram of the second cross-sectional structure of the CT tube in the embodiment of Figure 1;

[0019] Figure 3 is a structural schematic diagram of the CT tube fixation component provided in this application;

[0020] Figure 4 is a structural schematic diagram of the CT tube rotating component provided in this application.

[0021] Reference numerals: 100—Shielding cover; 200—Target plate; 300—Motor assembly; 310—Stator assembly; 311—Stator core; 320—Fixed spindle; 330—Rotating magnetic sleeve; 331—One end of the rotating magnetic sleeve; 332—The other end of the rotating magnetic sleeve; 340—Rotating conductive sleeve. 【Detailed Implementation Methods】

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0024] This application provides a CT tube. Referring to Figures 1 to 4, Figure 1 is a first cross-sectional view of an embodiment of the CT tube provided in this application; Figure 2 is a second cross-sectional view of the CT tube of the embodiment of Figure 1; Figure 3 is a structural diagram of the CT tube fixing component provided in this application; and Figure 4 is a structural diagram of the CT tube rotating component provided in this application. The tube includes a shielding cover 100, a motor assembly 300, and a target disk 200. Part of the motor assembly 300 and the target disk 200 are located within the shielding cover 100. The motor assembly 300 drives the target disk 200 to rotate at high speed. The shielding cover 100 provides a vacuum environment.

[0025] The motor assembly 300 of this application is an induction motor. Specifically, the motor assembly 300 includes a stator assembly 310, a rotating magnetic sleeve 330, a rotating conductive sleeve 340, and a fixed spindle 320. The stator assembly 310 includes a stator core 311, which is used to provide a stable rotating magnetic field. The rotating conductive sleeve 340 is sleeved on the outside of a first side of the rotating magnetic sleeve 330, and the first side is configured to face the stator core 311. The rotating conductive sleeve generates current by cutting the rotating magnetic field provided by the stator assembly. The rotating magnetic sleeve 330 is sleeved on the outside of the fixed spindle 320, and is rotatable relative to and spaced apart from the fixed spindle 320. The fixed spindle 320 is configured to connect a load; wherein, along the radial direction of the fixed spindle 320, the projection of the rotating magnetic sleeve 330 on the fixed spindle 320 overlaps the projection of the rotating conductive sleeve 340 on the fixed spindle 320.

[0026] Specifically, the stator core 311 is sleeved on the outside of the rotating conductive sleeve 340. The target disk 200, the rotating magnetic sleeve 330, the rotating conductive sleeve 340, and the fixed spindle 320 are disposed inside the shielding cover 100. The target disk 200 is sleeved on the outside of the fixed spindle 320 and is fixedly connected to the rotating magnetic sleeve 330 so as to be rotatably connected to the fixed spindle 320. The stator core 311 is disposed outside the shielding cover 100.

[0027] In this embodiment, along the radial direction of the fixed spindle 320, the projection of the rotating magnetic sleeve 330 on the fixed spindle 320 overlaps the projection of the rotating conductive sleeve 340 on the fixed spindle 320. That is, the rotating magnetic sleeve 330 is at least partially located between the rotating conductive sleeve 340 and the fixed spindle 320. Therefore, the air gap between the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 is so small that it can be ignored. Thus, the magnetic lines of force of the motor assembly 300 of this application pass through the following path in sequence: the first air gap between the side of the stator core 311 facing the rotating conductive sleeve 340 and the shield 100, the shield 100, the second air gap between the shield 100 and the rotating conductive sleeve 340, the rotating conductive sleeve 340, and the rotating magnetic sleeve 330. The magnetic lines of force return to the stator core 311 in sequence after the rotating magnetic sleeve 330 closes the loop, forming a closed loop. Therefore, the magnetic circuit path of the motor assembly 300 of this application does not need to pass through the air gap between the rotating magnetic sleeve 330 and the fixed spindle 320, which can shorten the magnetic circuit path, improve the efficiency of the motor assembly 300, and enhance the reliability of the motor assembly 300.

[0028] Furthermore, the rotating magnetic sleeve 330 is located outside the fixed spindle 320 and rotates relative to the fixed spindle 320. That is, the rotating conductive sleeve 340 rotates relative to the fixed spindle 320. Since the frequency at which the magnetic field of the stator assembly 310 cuts the rotating conductive sleeve 340 is lower than the frequency at which it cuts the fixed spindle 320, the difference between the rotational speed of the rotating conductive sleeve 340 and the frequency of the rotating magnetic field provided by the stator assembly 310 is only the slip rate, which is a lower frequency. Therefore, the eddy current loss of the rotating conductive sleeve 340 is smaller, and the heat generation of the rotating conductive sleeve 340 is lower. This can reduce the rate of temperature rise inside the shield 100, thereby extending the working time of the CT tube 10 and enhancing the reliability of the CT tube 10.

[0029] In one embodiment, one end 331 of the rotating magnetic sleeve has a mounting groove (not shown) facing the stator assembly 310. The rotating conductive sleeve 340 is disposed in the mounting groove, allowing the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 to fit together, thereby reducing the air gap between them and improving the efficiency of the motor assembly 300. The other end 332 of the rotating magnetic sleeve is connected to the load. For example, the load is a target disk 200, and the other end 332 of the rotating magnetic sleeve is connected to the target disk 200. The rotating conductive sleeve 340 generates current by cutting the rotating magnetic field, causing the rotating magnetic sleeve 330 to generate rotational torque, thereby driving the target disk 200 to rotate.

[0030] In one embodiment, the rotating magnetic sleeve 330 is made of a magnetically conductive martensitic stainless steel such as 2Cr13, which has high magnetic permeability and can concentrate magnetic lines of force in the component, thereby reducing magnetic leakage.

[0031] In one embodiment, the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 are sealed together, so that the gas trapped at the joint of the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 is sealed, preventing the gas trapped from being released into the shield 100, ensuring that the inside of the shield 100 is a high vacuum environment, thereby enhancing the reliability of the CT tube 10.

[0032] In one embodiment, the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 are welded together, that is, the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 are connected by welding to seal the gas trapped at the joint of the rotating magnetic sleeve 330 and the rotating conductive sleeve 340. For example, at the joint of the rotating magnetic sleeve 330 and the rotating conductive sleeve 340, a full-circle welding method is used to weld, so that the gas trapped at the joint of the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 is sealed, which can enhance the reliability of the CT tube 10.

[0033] In one embodiment, the rotating magnetic sleeve 330 and the rotating conductive sleeve 340 are sealed together by a sealing element (not shown in the figure). The sealing element can be an O-ring or similar, and is not limited thereto. This embodiment provides a sealing element between the rotating magnetic sleeve 330 and the rotating conductive sleeve 340, thereby sealing any air trapped at the joint between them and enhancing the reliability of the CT scanner.

[0034] In one embodiment, the rotating magnetic sleeve 330 includes a rotating steel sleeve. The rotating steel sleeve is made of magnetically conductive stainless steel, or it can be made of other materials with good magnetic conductivity, such as carbon steel. For carbon steel, surface treatment can be carried out by electroplating methods such as nickel plating to minimize surface gas trapping.

[0035] In one embodiment, the rotating conductive sleeve 340 includes a rotating copper sleeve, for example, a conductive rotating copper sleeve made of oxygen-free copper material. In other embodiments, the rotating conductive sleeve 340 may also be made of other materials with low resistivity, such as an aluminum sleeve.

[0036] In one embodiment, the fixed mandrel 320 includes a fixed steel sleeve. The fixed steel sleeve provides support for the fixed mandrel 320, which is connected to the target disk 200 via a bearing. Simultaneously, it can also, to some extent, concentrate magnetic lines of force within this component, reducing magnetic leakage.

[0037] In one embodiment, the projection of the rotating conductive sleeve 340 onto the fixed spindle 320 along the radial direction of the fixed spindle 320 overlaps the projection of the stator core 311 onto the fixed spindle 320. It is understood that a large number of magnetic field lines pass through the rotating conductive sleeve 340 along the radial direction of the fixed spindle 320, resulting in high efficiency of the rotating conductive sleeve 340 in generating current through a rotating magnetic field, thereby improving the efficiency of the motor assembly 300.

[0038] In one embodiment, the fixed mandrel 320 includes a hollow shaft (not shown in the figure), which is lighter than a solid shaft and can reduce the weight of the CT tube 10.

[0039] In one embodiment, the stator assembly 310 may be a single-phase or multi-phase stator assembly 310, and there is no limitation herein. The stator assembly 310 is used to provide a stable rotating magnetic field.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A motor assembly, characterized in that, The motor assembly includes: Stator assembly, including stator core; Rotating magnetic sleeve; A rotating conductive sleeve is fitted over the first side of the rotating magnetic sleeve, and the first side is configured to face the stator core. A fixed mandrel, wherein the rotating magnetic sleeve is disposed outside the fixed mandrel, rotates relative to the fixed mandrel and is spaced apart, and the fixed mandrel is configured to connect a load; Wherein, along the radial direction of the fixed mandrel, the projection of the rotating magnetic sleeve on the fixed mandrel overlaps the projection of the rotating conductive sleeve on the fixed mandrel.

2. The motor assembly according to claim 1, characterized in that, One end of the rotating magnetic sleeve is provided with a mounting groove facing one side of the stator assembly, and the rotating conductive sleeve is disposed in the mounting groove; The other end of the rotating magnetic sleeve is configured to connect a load.

3. The motor assembly according to claim 1, characterized in that, The rotating magnetic sleeve and the rotating conductive sleeve are sealed together.

4. The motor assembly according to claim 3, characterized in that, The rotating magnetic sleeve is welded to the rotating conductive sleeve.

5. The motor assembly according to claim 3, characterized in that, The rotating magnetic sleeve and the rotating conductive sleeve are sealed together by a sealing element.

6. The motor assembly according to claim 1, characterized in that, The rotating magnetic sleeve includes a rotating steel sleeve, the rotating conductive sleeve includes a rotating copper sleeve, and the fixed mandrel includes a fixed steel sleeve.

7. The motor assembly according to claim 1, characterized in that, Along the radial direction of the fixed mandrel, the projection of the rotating conductive sleeve on the fixed mandrel overlaps the projection of the stator core on the fixed mandrel.

8. The motor assembly according to claim 1, characterized in that, The stator core is sleeved on the outside of the rotating conductive sleeve.

9. The motor assembly according to claim 1, characterized in that, The fixed mandrel includes a hollow shaft.

10. A CT X-ray tube, characterized in that, The CT tube includes: The motor assembly according to any one of claims 1-9; The shielding cover includes a rotating magnetic sleeve, a rotating conductive sleeve, and a fixed mandrel located inside the shielding cover, while the stator assembly is located outside the shielding cover. The target disk is located inside the shielding cover, sleeved outside the fixed mandrel, and fixedly connected to the rotating magnetic sleeve so as to be rotatably connected to the fixed mandrel.

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