CN218976479U

CN218976479U - Magnetic suspension motor structure

Info

Publication number: CN218976479U
Application number: CN202223436883.XU
Authority: CN
Inventors: 周中华; 周云; 吕诏凌
Original assignee: Shanghai United Compressor Co ltd
Current assignee: Shanghai United Compressor Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-05
Anticipated expiration: 2032-12-21

Abstract

The utility model provides a magnetic suspension motor structure, relates to the technical field of magnetic suspension motors, and solves the technical problem that a magnetic suspension bearing in a magnetic suspension motor in the prior art is low in load capacity. The device comprises a rotating shaft, a motor casing, a first end cover and a second end cover, wherein the rotating shaft is of a hollow structure, the first end cover and the second end cover are respectively connected with two ends of the motor casing, the rotating shaft is positioned in the motor casing, and two ends of the rotating shaft are respectively connected with the first end cover and the second end cover in a rotating mode.

Description

Magnetic suspension motor structure

Technical Field

The utility model relates to the technical field of magnetic levitation motors, in particular to a magnetic levitation motor structure.

Background

The magnetic suspension motor is a motor with a novel structure, and the biggest difference with the traditional motor is that the motor does not need a bearing to support a rotating shaft, and the motor can generate torque and magnetic suspension force for supporting a rotor. The magnetic suspension motor has the advantages of no friction, suitability for high-speed operation, long service life and the like due to the non-contact and non-lubrication characteristics of the magnetic suspension bearing. The motor has the advantages of small volume, high power density and the like, and the rated rotation speed can reach tens of thousands or even hundreds of thousands of rotations per minute, so the motor is widely applied to the fields of high-speed rotating machinery such as a turbomolecular pump, a compressor, flywheel energy storage and the like.

The magnetic suspension bearing not only provides necessary axial force and radial force for the motor rotor, but also provides stable operation conditions for high-speed rotating machines such as a turbo molecular pump, a compressor and the like, and can cause instantaneous instability of a rotating shaft when being subjected to external disturbance or internal fluid disturbance, and when the disturbance quantity exceeds the control capacity of the magnetic suspension bearing, the rotor is scratched and rubbed, and even the rotor is locked.

Disclosure of Invention

The utility model aims to provide a magnetic suspension motor structure to solve the technical problem of lower load capacity of a magnetic suspension bearing in a magnetic suspension motor in the prior art _。 The preferred technical solutions of the technical solutions provided by the present utility model can produce a plurality of technical effects described below.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a magnetic suspension motor structure which comprises a rotating shaft, a motor shell, a first end cover and a second end cover, wherein the rotating shaft is of a hollow structure, the first end cover and the second end cover are respectively connected with two ends of the motor shell, the rotating shaft is positioned in the motor shell, and two ends of the rotating shaft are respectively connected with the first end cover and the second end cover in a rotating mode.

Optionally, a heat dissipation liquid groove, a liquid outlet and a liquid inlet are arranged in the motor casing, the liquid outlet and the liquid inlet are respectively communicated with two ends of the heat dissipation liquid groove, and the heat dissipation liquid groove is a multi-spiral groove.

Optionally, the motor further comprises a stator, a rotor and a wiring board, wherein the rotating shaft is provided with a positioning part, the rotor is sleeved on the positioning part and is in fit connection with the positioning part, the stator is sleeved on the rotor and is in rotation connection with the rotor, the stator is in fit connection with the inner wall of the motor casing, the wiring board is installed on the motor casing, and the wiring board is electrically connected with the stator;

the rotor is made of permanent magnets.

Optionally, a gap between the stator and the motor casing is filled with a setting gel.

Optionally, the device further comprises a magnetic levitation radial bearing, silicon steel sheets and a first displacement sensor, wherein the number of the magnetic levitation radial bearing, the number of the silicon steel sheets and the number of the first displacement sensor are two, the magnetic levitation radial bearing and the silicon steel sheets are respectively located at two ends of the rotating shaft, the silicon steel sheets are inlaid on the end parts of the rotating shaft, the magnetic levitation radial bearing is sleeved on the silicon steel sheets and is rotationally connected with the silicon steel sheets, one magnetic levitation radial bearing is connected with the first end cover, the other magnetic levitation radial bearing is connected with the second end cover, the magnetic levitation radial bearing and the first displacement sensor are electrically connected with the bearing controller, and the first displacement sensor is used for sensing corresponding radial displacement, temperature and rotating speed of the silicon steel sheets.

Optionally, the device further comprises a magnetic suspension axial bearing, an annular sleeve and a second displacement sensor, wherein the annular sleeve is inlaid on the rotating shaft, the annular sleeve is positioned on the inner side of the silicon steel sheet, the number of the magnetic suspension axial bearings is two, the two magnetic suspension axial bearings are connected with the first end cover, the annular sleeve is positioned between the two magnetic suspension axial bearings, the second displacement sensor and the two magnetic suspension axial bearings are electrically connected with the bearing controller, and the second displacement sensor is used for sensing the axial displacement and the temperature of the corresponding annular sleeve.

Optionally, the device further comprises a protection bearing, the rotating shaft is rotatably connected with the first end cover through two protection bearings, and the rotating shaft is rotatably connected with the second end cover through one protection bearing.

Optionally, the motor casing is made of aluminum alloy.

According to the magnetic suspension motor structure, when the rotating shaft transmits torque, the effect of transmitting effective torque is larger from a radial section, so that when the rotating shaft needs to transmit larger torque, a thicker shaft diameter is needed, and because the effect of transmitting torque at an axle center part is smaller, the rotating shaft adopts a hollow structure to reduce the dead weight of the rotating shaft and properly increase the outer diameter of the rotating shaft, thereby improving the effective torque of the rotating shaft, simultaneously enhancing the rigidity of the rotating shaft, correspondingly increasing the outer diameter of a magnetic suspension bearing, improving the loading capacity of the magnetic suspension bearing, and solving the technical problem of lower loading capacity of the magnetic suspension bearing in the magnetic suspension motor in the prior art _。

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a magnetic levitation motor according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of a magnetic levitation motor structure according to an embodiment of the present utility model;

in the figure, 1, a rotating shaft; 2. a motor housing; 21. a heat radiation liquid tank; 22. a liquid outlet; 23. a liquid inlet; 3. a first end cap; 4. a second end cap; 5. a stator; 6. a rotor; 7. a magnetic suspension radial bearing; 8. a silicon steel sheet; 9. a wiring board; 10. a magnetic levitation axial bearing; 20. an annular sleeve; 30. protecting the bearing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

In the description of the present utility model, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

The utility model provides a magnetic suspension motor structure which comprises a rotating shaft 1, a motor shell 2, a first end cover 3 and a second end cover 4, wherein the rotating shaft 1 is of a hollow structure, the first end cover 3 and the second end cover 4 are respectively connected with two ends of the motor shell 2, the rotating shaft 1 is positioned in the motor shell 2, and two ends of the rotating shaft 1 are respectively connected with the first end cover 3 and the second end cover 4 in a rotating way. According to the magnetic suspension motor structure provided by the utility model, when the rotating shaft 1 transmits torque, the effect of transmitting effective torque is larger from a radial section, so that when the rotating shaft 1 needs to transmit larger torque, a thicker shaft diameter is needed, and because the effect of transmitting torque at the shaft center part is smaller, the rotating shaft 1 adopts a hollow structure to reduce the dead weight of the rotating shaft 1 and properly increase the outer diameter of the rotating shaft 1, thereby improving the effective torque of the rotating shaft 1, simultaneously the rigidity of the rotating shaft 1 is enhanced, the outer diameter of a magnetic suspension bearing is correspondingly increased, the load capacity of the magnetic suspension bearing is improved, and the technical problem that the load capacity of the magnetic suspension bearing in the magnetic suspension motor in the prior art is lower is solved.

As an alternative embodiment, the motor casing 2 is provided with the cooling liquid groove 21, the liquid outlet 22 and the liquid inlet 23 are respectively communicated with two ends of the cooling liquid groove 21, cold night enters the cooling liquid groove 21 from the liquid inlet 23 and then flows out from the liquid outlet 22, so that the stator 5 is cooled, the cooling liquid groove 21 is a multi-spiral groove, and the contact area of the cold night can be increased by the multi-spiral groove, so that the cooling effect on the stator 5 is improved.

As an alternative embodiment, the motor further comprises a stator 5, a rotor 6 and a wiring board 9, wherein the rotating shaft 1 is provided with a positioning part, the rotor 6 is sleeved on the positioning part, the rotor 6 is in fit connection with the positioning part, the positioning part is used for limiting the rotor 6 to move along the axial direction of the rotating shaft 1, the stator 5 is sleeved on the rotor 6, the stator 5 is in rotary connection with the rotor 6, the stator 5 is in fit connection with the inner wall of the motor casing 2, the wiring board 9 is installed on the motor casing 2, and the wiring board 9 is electrically connected with the stator 5; the rotor 6 is made of permanent magnets.

As an alternative embodiment, the gap between the stator 5 and the motor casing 2 is filled with the solidified glue, a glue filling process can be adopted between the stator 5 and the motor casing 2, and the solidified glue can improve the heat exchange coefficient between the stator 5 and the motor casing 2, so that the running temperature rise of the stator 5 can be effectively controlled.

As an alternative implementation mode, the magnetic levitation radial bearing device further comprises a magnetic levitation radial bearing 7, a silicon steel sheet 8 and a first displacement sensor, wherein the number of the magnetic levitation radial bearing 7, the number of the silicon steel sheet 8 and the number of the first displacement sensor are two, the magnetic levitation radial bearing 7 and the silicon steel sheet 8 are respectively positioned at two ends of the rotating shaft 1, the silicon steel sheet 8 is inlaid on the end part of the rotating shaft 1, the magnetic levitation radial bearing 7 is sleeved on the silicon steel sheet 8 and is rotationally connected with the silicon steel sheet 8, one magnetic levitation radial bearing 7 is connected with the first end cover 3, the other magnetic levitation radial bearing 7 is connected with the second end cover 4, the magnetic levitation radial bearing 7 and the first displacement sensor are electrically connected with the bearing controller, and the first displacement sensor is used for sensing the radial displacement, the temperature and the rotating speed of the corresponding silicon steel sheet 8. After the magnetic suspension radial bearing 7 is electrified, the magnetic suspension radial bearing 7 is magnetic, so that the magnetic suspension radial bearing 7 is used for magnetically attracting the silicon steel sheet 8, when the rotating shaft 1 deflects towards a radial direction in the rotating process of the rotating shaft 1, the silicon steel sheet 8 also deflects towards the radial direction, the corresponding first displacement sensor senses the radial deflection information of the silicon steel sheet 8 and transmits the radial deflection information to the bearing controller, and the bearing controller can control the magnetic force of one part on the corresponding magnetic suspension radial bearing 7 to be enhanced according to the radial deflection information, so that the silicon steel sheet 8 is pulled to the original position through the enhanced magnetic force, and the rotating shaft 1 returns to the original position.

As an alternative embodiment, the device further comprises a magnetic suspension axial bearing 10, an annular sleeve 20 and a second displacement sensor, wherein the annular sleeve 20 is inlaid on the rotating shaft 1, the annular sleeve 20 is positioned on the inner side of the silicon steel sheet 8, the number of the magnetic suspension axial bearings 10 is two, the two magnetic suspension axial bearings 10 are connected with the first end cover 3, the annular sleeve 20 is positioned between the two magnetic suspension axial bearings 10, the second displacement sensor and the two magnetic suspension axial bearings 10 are electrically connected with the bearing controller, the second displacement sensor is used for sensing the axial displacement and the temperature of the corresponding annular sleeve 20, and the magnetic suspension axial bearings 10 are magnetic after being electrified, so that the magnetic suspension axial bearings 10 are used for magnetically attracting the annular sleeve 20. In the process of rotating the rotating shaft 1, when the rotating shaft 1 deflects towards the axial direction, the annular sleeve 20 deflects towards the direction close to one magnetic suspension axial bearing 10, the second displacement sensor senses the axial deflection information of the annular sleeve 20 and transmits the axial deflection information to the bearing controller, and the bearing controller controls the magnetic force of the other magnetic suspension axial bearing 10 to be enhanced according to the axial deflection information, so that the annular sleeve 20 is pulled to the original position through the enhanced magnetic force, and the rotating shaft 1 returns to the original position.

As an alternative embodiment, it further comprises a protection bearing 30, the rotating shaft 1 is rotatably connected with the first end cover 3 through two protection bearings 30, and the rotating shaft 1 is rotatably connected with the second end cover 4 through one protection bearing 30.

As an alternative embodiment, the material used for the motor case 2 may be an aluminum alloy.

According to the magnetic suspension motor structure, the rotating shaft 1 is of a hollow structure, so that the weight of the rotating shaft 1 is reduced, the outer diameter of the rotating shaft 1 is correspondingly increased in order to ensure the rigidity and strength requirements, the inner diameters and the outer diameters of the stator 5, the rotor 6, the magnetic suspension radial bearing 7 and the magnetic suspension axial bearing 10 are correspondingly increased, the thicknesses of the stator 5 and the rotor 6 are shortened, the axial length of the rotating shaft 1 is synchronously shortened, and the size of the motor casing 2 is synchronously adjusted.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The magnetic suspension motor structure is characterized by comprising a rotating shaft (1), a motor shell (2), a first end cover (3) and a second end cover (4), wherein,

the rotating shaft (1) is of a hollow structure, the first end cover (3) and the second end cover (4) are respectively connected with two ends of the motor casing (2), the rotating shaft (1) is positioned in the motor casing (2), and two ends of the rotating shaft (1) are respectively connected with the first end cover (3) and the second end cover (4) in a rotating mode.

2. The magnetic levitation motor structure according to claim 1, wherein a heat dissipation liquid groove (21), a liquid outlet (22) and a liquid inlet (23) are arranged in the motor casing (2), the liquid outlet (22) and the liquid inlet (23) are respectively communicated with two ends of the heat dissipation liquid groove (21), and the heat dissipation liquid groove (21) is a multi-spiral groove.

3. The magnetic levitation motor structure according to claim 1, further comprising a stator (5), a rotor (6) and a wiring board (9), wherein a positioning part is arranged on the rotating shaft (1), the rotor (6) is sleeved on the positioning part and the rotor (6) is matched and connected with the positioning part, the stator (5) is sleeved on the rotor (6) and the stator (5) is rotationally connected with the rotor (6), the stator (5) is matched and connected with the inner wall of the motor casing (2), the wiring board (9) is mounted on the motor casing (2), and the wiring board (9) is electrically connected with the stator (5);

the rotor (6) is made of permanent magnets.

4. A magnetic levitation motor structure according to claim 3, characterized in that the gap between the stator (5) and the motor housing (2) is filled with a setting glue.

5. The magnetic levitation motor structure according to claim 1, further comprising a magnetic levitation radial bearing (7), a silicon steel sheet (8) and a first displacement sensor, wherein the number of the magnetic levitation radial bearing (7), the number of the silicon steel sheet (8) and the number of the first displacement sensor are two, the magnetic levitation radial bearing (7) and the silicon steel sheet (8) are respectively located at two ends of the rotating shaft (1), the silicon steel sheet (8) is inlaid on the end part of the rotating shaft (1), the magnetic levitation radial bearing (7) is sleeved on the silicon steel sheet (8) and the magnetic levitation radial bearing (7) is rotationally connected with the silicon steel sheet (8), one magnetic levitation radial bearing (7) is connected with the first end cover (3), the other magnetic levitation radial bearing (7) is connected with the second end cover (4), the magnetic levitation radial bearing (7) and the first displacement sensor are electrically connected with a bearing controller, and the first displacement sensor is used for sensing the radial displacement of the silicon steel sheet (8) and the rotating speed.

6. The magnetic levitation motor structure according to claim 5, further comprising a magnetic levitation axial bearing (10), an annular sleeve (20) and a second displacement sensor, wherein the annular sleeve (20) is embedded on the rotating shaft (1), the annular sleeve (20) is located on the inner side of the silicon steel sheet (8), the number of the magnetic levitation axial bearings (10) is two, the two magnetic levitation axial bearings (10) are connected with the first end cover (3), the annular sleeve (20) is located between the two magnetic levitation axial bearings (10), the second displacement sensor and the two magnetic levitation axial bearings (10) are electrically connected with the bearing controller, and the second displacement sensor is used for sensing the axial displacement and the temperature of the corresponding annular sleeve (20).

7. A magnetic levitation motor structure according to claim 1, further comprising a protection bearing (30), wherein the spindle (1) is rotatably connected to the first end cap (3) by two protection bearings (30), and wherein the spindle (1) is rotatably connected to the second end cap (4) by one of the protection bearings (30).

8. A magnetic levitation motor structure according to claim 1, characterized in that the motor housing (2) is made of aluminum alloy.