WO2020228333A1

WO2020228333A1 - Magnetic suspension bearing, motor, compressor, and air conditioner

Info

Publication number: WO2020228333A1
Application number: PCT/CN2019/127521
Authority: WO
Inventors: 钟敦颖; 龚高; 张超; 董如昊; 魏志韬
Original assignee: 珠海格力电器股份有限公司
Priority date: 2019-05-13
Filing date: 2019-12-23
Publication date: 2020-11-19
Also published as: CN112564398A; CN112564399A; CN112564399B; CN112564400A; CN110165823A; CN112564400B

Abstract

A magnetic suspension bearing, a motor, a compressor, and an air conditioner. The magnetic suspension bearing comprises a rotor thrust disc (1), axial bearing stators (2), and an axial displacement detection apparatus (3); the axial displacement detection apparatus (3) is used for detecting the axial location of the rotor thrust disc (1), two axial ends of the rotor thrust disc (1) are respectively provided with an axial bearing stator (2), at least one axial bearing stator (2) thereamong is provided thereon with the axial displacement detection apparatus (3), and the axial displacement detection apparatus (3) and the axial bearing stator (2) on which said apparatus is located are an integral structure.

Description

Magnetic bearings, motors, compressors and air conditioners

The present disclosure is based on the application with the CN application number 201910395606.2 and the filing date of May 13, 2019, and claims its priority. The disclosure of the CN application is hereby incorporated into the present disclosure as a whole.

Technical field

The present disclosure belongs to the technical field of air conditioning, and specifically relates to a magnetic suspension bearing, a motor, a compressor and an air conditioner.

Background technique

Magnetic bearings have the characteristics of no mechanical contact, no lubrication, high critical speed, long service life and high reliability, and are widely used in high-speed and ultra-high-speed fields. The sensor is an indispensable part of the magnetic levitation system, and its detection accuracy is very important. Improving the position detection accuracy of the magnetic levitation system can not only improve the overall performance of the system but also increase its life.

The known magnetic bearing system adopts the form of sensing actuation separation, and its basic structure includes an optical axis, an axial displacement sensor, an axial position detection disc, a rotor thrust disc, an axial bearing core, and an axial bearing coil.

The axial bearing stators are arranged on both sides of the rotor thrust plate, the axial displacement sensor for detecting the axial displacement of the rotor is arranged on the left end surface of the shaft, and the sensor is installed separately from the bearing. When the optical shaft is axially displaced, the sensor converts the detected displacement change into a signal and transmits it to the system, and then controls the output of the axial bearing to make the shaft return to a safe position.

However, for this structure, due to the large distance between the axial position of the rotor detected by the axial sensor and the axial position of the thrust plate, the axial position of the rotor detected by the axial sensor is different from the actual thrust bearing. The axial clearance data may be inconsistent, which will affect the control accuracy of the system and reduce the working performance of the magnetic bearing.

Public content

The present disclosure provides a magnetic suspension bearing, which includes a rotor thrust disc, an axial bearing stator, and an axial displacement detection device. The axial displacement detection device is used to detect the axial position of the rotor thrust disc. The axial ends of the rotor thrust disc are respectively An axial bearing stator is provided, an axial displacement detection device is arranged on at least one axial bearing stator, and the axial displacement detection device is an integrated structure with the axial bearing stator where it is located.

In some embodiments, at least one axial bearing stator is provided with a mounting hole extending in the axial direction, and the axial displacement detecting device is located in the mounting hole and forms an integrated structure with the axial bearing stator.

In some embodiments, the mounting hole is a through hole; or, the mounting hole is a blind hole, and the opening of the mounting hole faces the rotor thrust plate.

In some embodiments, the axial displacement detection device is encapsulated in the mounting hole.

In some embodiments, a plastic-encapsulated column is potted in the mounting hole, and the axial displacement detection device forms an integrated structure with the axial bearing stator through the plastic-encapsulated column.

In some embodiments, the outlet wire of the axial displacement detection device passes through the mounting hole and is fixed by the plastic-encapsulated column.

In some embodiments, the end of the axial bearing stator away from the rotor thrust plate is provided with an outlet circuit board, and the outlet circuit board is provided with an escape hole corresponding to the plastic-encapsulated column.

In some embodiments, the outlet circuit board is provided with an outlet terminal, and the outlet of the axial displacement detection device is connected to the outlet terminal through the outlet circuit board.

In some embodiments, the outlet circuit board adopts a multilayer PCB board structure.

In some embodiments, there are multiple axial displacement detection devices, and the multiple axial displacement detection devices are arranged on the axial bearing stator along the circumferential direction.

In some embodiments, the axial bearing stator includes a stator core and a stator coil. The stator core is provided with a wire slot, the stator coil is embedded in the wire slot, and the axial displacement detection device is provided on the diameter of the wire slot of the stator core. To the outside.

According to another aspect of the present disclosure, a motor is provided. The motor includes a magnetic suspension bearing, and the magnetic suspension bearing is the above-mentioned magnetic suspension bearing.

According to another aspect of the present disclosure, a compressor is provided. The compressor includes a magnetic suspension bearing, and the magnetic suspension bearing is the above-mentioned magnetic suspension bearing.

According to another aspect of the present disclosure, an air conditioner is provided. The air conditioner includes a magnetic suspension bearing, and the magnetic suspension bearing is the above-mentioned magnetic suspension bearing.

Description of the drawings

The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

FIG. 1 is a schematic cross-sectional structure diagram of a magnetic suspension bearing according to an embodiment of the disclosure;

2 is a schematic diagram of a three-dimensional structure of a magnetic suspension bearing according to an embodiment of the disclosure;

3 is a schematic diagram of an exploded structure of a magnetic suspension bearing according to an embodiment of the disclosure;

4 is a schematic structural diagram of a single-sided axial bearing stator of a magnetic suspension bearing according to an embodiment of the disclosure;

FIG. 5 is a schematic diagram of an enlarged structure at A in FIG. 4.

In the picture:

1. Rotor thrust plate; 2. Axial bearing stator; 3. Axial displacement detection device; 4. Mounting hole; 5. Plastic-encapsulated column; 6. Outgoing circuit board; 7. Outgoing terminal; 8. Stator core; 9. Stator coil.

Detailed ways

With reference to Figures 1 to 5, according to an embodiment of the present disclosure, a magnetic suspension bearing includes a rotor thrust disc 1, an axial bearing stator 2 and an axial displacement detection device 3, and the axial displacement detection device 3 is used to detect the rotor thrust disc At the axial position of 1, axial bearing stators 2 are respectively arranged on both axial ends of the rotor thrust plate 1, and axial displacement detecting device 3 is arranged on at least one of the axial bearing stators 2, and axial displacement detecting device 3 The stator 2 is an integrated structure with the axial bearing.

The magnetic suspension bearing forms an integrated structure between the axial displacement detection device 3 that measures the axial position of the rotor thrust plate 1 and the axial bearing stator 2, without the need for a separate axial displacement detection device 3, and the axial displacement The data detected by the detection device 3 is the actual gap between the axial bearing stator 2 and the rotor thrust disc 1, which can make the detection data of the axial displacement detection device 3 consistent with the actual gap of the rotor thrust disc 1, which improves the control accuracy. At the same time, there is no need to increase the axial length of the main shaft provided with the axial displacement detection device 3, which can reduce the length and quality of the main shaft, improve the dynamic performance of the main shaft, and improve the integration and control accuracy of the magnetic bearing.

At least one of the axial bearing stators 2 is provided with a mounting hole 4 along the axial direction. The axial displacement detecting device 3 is located in the mounting hole 4 and forms an integrated structure with the axial bearing stator 2 through the mounting hole 4. The mounting hole 4 extends along the axial direction of the axial bearing stator 2 so as to facilitate the installation of the axial displacement detection device 3 in the mounting hole 4 and form an integrated structure with the axial bearing stator 2 in the mounting hole 4.

Generally speaking, the axial displacement detection device 3 adopts an axial displacement sensor, which is arranged along the axial direction to sense the axial displacement of the rotor thrust plate 1. Therefore, the mounting hole 4 is arranged in the axial direction so that the mounting hole The extension direction of 4 is consistent with the sensing direction of the axial displacement sensor, which is more convenient for the installation and positioning of the axial displacement sensor. Since the mounting hole 4 is opened on the axial bearing stator 2, the structural characteristics of the axial bearing stator 2 can be fully utilized to realize the integration between the axial bearing stator 2 and the axial displacement detection device 3, avoiding axial displacement The additional volume of the detection device 3 is occupied, the structure design is more reasonable, the axial length of other structures is not added, and the length of the main shaft is reduced as a whole. The axial displacement sensor is, for example, an eddy current sensor.

The installation method of the axial displacement detection device 3 in the mounting hole 4 can be welding, gluing, filling and fixing or packaging fixing, etc., as long as the axial displacement detection device 3 and the axial bearing stator 2 can be integrated into the structure. .

The mounting hole 4 may be a through hole.

The mounting hole 4 may also be a blind hole. When the mounting hole 4 is a blind hole, the opening of the mounting hole 4 faces the rotor thrust plate 1 so that the sensing end of the axial displacement detection device 3 can face the rotor thrust plate 1.

In this embodiment, the axial displacement detecting device 3 is enclosed in the mounting hole 4. When installing the axial displacement detection device 3 on the axial bearing stator 2, first install the axial displacement detection device 3 in the mounting hole 4 and position it, and then fill the mounting hole 4 with potting glue. Therefore, the axial displacement detection device 3 is encapsulated in the mounting hole 4 by potting glue, and forms an integrated structure with the axial bearing stator 2.

The mounting hole 4 is filled with a plastic-encapsulated column 5, and the axial displacement detecting device 3 forms an integrated structure with the axial bearing stator 2 through the plastic-encapsulated column 5. After the axial displacement detection device 3 is potted in the mounting hole 4, a plastic sealing column 5 will be formed in the mounting hole 4. The plastic sealing column 5 is supported by epoxy resin or other potting glue with high hardness to ensure axial displacement The installation position of the detection device 3 in the installation hole 4 is more accurate, and the detection result of the axial displacement of the rotor thrust plate 1 is more accurate. In some embodiments, in this embodiment, after the axial displacement detection device 3 is potted in the axial bearing stator 2 through the plastic-encapsulated column 5, the end of the sensing end of the axial displacement detection device 3 and the axial bearing The end surface of the stator 2 facing the rotor thrust disc 1 is flush, and accurate axial clearance data between the rotor thrust disc 1 and the axial bearing stator 2 can be directly obtained.

In some embodiments, the outlet wire of the axial displacement detection device 3 extends from the plastic-encapsulated column 5 away from the rotor thrust plate 1 through the plastic-encapsulated column 5 to extend the axial bearing stator 2. Since the outlet wire of the axial displacement detection device 3 passes through the mounting hole 4 and is fixed by the plastic-encapsulated column 5, it can facilitate the wiring of the axial displacement detection device 3, avoid the problem of cluttered wiring, save wiring space, and It can effectively locate and protect the wiring. After the outlet wire of the displacement detection device 3 passes through the installation hole 4, the plastic packaging material is filled into the installation hole 4 to form a plastic seal column 5, and the outlet wire of the axial displacement detection device 3 is embedded in the plastic seal column 5.

In this embodiment, the end of the axial bearing stator 2 away from the rotor thrust plate 1 is provided with an outlet circuit board 6, and an escape hole is provided on the outlet circuit board 6 corresponding to the plastic-encapsulated column 5. The outgoing circuit board 6 is fixedly arranged on the axial bearing stator 2, and an escape hole is opened on the outgoing circuit board 6. When the axial displacement detection device 3 is potted, the plastic sealing column 5 can be formed in the escape hole at the same time. It avoids the interference of the outlet circuit board 6 on the molding of the plastic-encapsulated column 5, and can realize the fixation between the outlet circuit board 6 and the axial bearing stator 2 through the plastic-encapsulated column 5, and further realizes the connection between the outlet circuit board 6 and the axial bearing stator 2. The integration between the two makes the structure more compact and stable.

In some embodiments, the outlet circuit board 6 is provided with an outlet terminal 7, and the outlet of the axial displacement detecting device 3 is connected to the outlet terminal 7 through the outlet circuit board 6. Since the outlet wires of the axial displacement detection device 3 and the axial bearing stator 2 are both arranged on the same outlet circuit board 6, the number of system outlet terminals can be reduced, the connection structure is simplified, the structure cost is reduced, and the connection quality is improved.

In some embodiments, the outlet circuit board 6 adopts a multi-layer PCB board structure, which can play a role in shielding and protecting weak current lines.

In some embodiments, there are multiple axial displacement detection devices 3, and the multiple axial displacement detection devices 3 are evenly arranged on the axial bearing stator 2 along the circumferential direction.

The axial displacement detection device 3 can be provided only on the axial bearing stator 2 on the axial side of the rotor thrust disc 1, or can be provided on the axial bearing stator 2 on both axial sides of the rotor thrust disc 1 respectively. The device 3 detects the axial displacement of the rotor thrust disk 1 from both sides of the rotor thrust disk 1 at the same time, thereby further improving the detection accuracy.

The axial bearing stator 2 includes a stator core 8 and a stator coil 9. The stator core 8 is provided with a wire slot, the stator coil 9 is embedded in the wire slot, and the axial displacement detection device 3 is provided in the wire slot of the stator core 8. Radial outside. Arranging the axial displacement detection device 3 on the radially outer side of the slot of the stator core 8 can not only make more reasonable use of the structure of the stator core 8, but also avoid the impact of the axial displacement detection device 3 on the axial bearing stator 2 The magnetic induction structure has an influence to ensure the magnetic induction effect of the magnetic suspension bearing.

The working principle of magnetic bearing is as follows:

The axial displacement sensor is responsible for detecting the axial displacement of the rotor thrust disc 1. When the system is operating normally, a predetermined gap is maintained between the rotor thrust disc 1 and the axial bearing stators 2 on both sides; when the rotor thrust disc 1 moves to one side During displacement, the axial displacement sensor transmits the detected data to the system controller. The system controller controls the axial position of the rotor thrust plate 1 by adjusting the input current of the axial bearing stator 2 to prevent the rotor thrust plate 1 from interacting with each other. An axial collision occurs between the axial bearing and the stator 2 to ensure the safe and stable operation of the entire magnetic levitation system.

The axial displacement sensor is potted in the axial bearing stator 2. The sensor detection data is the actual gap between the axial bearing stator 2 and the rotor thrust plate 1, so that the sensor detection data is between the rotor thrust plate 1 and the axial bearing stator 2. The actual gap between the two is consistent, which improves the control accuracy, reduces the length and quality of the spindle, and improves the dynamic performance of the spindle.

According to another aspect of the present disclosure, there is also provided a motor including a magnetic suspension bearing, and the magnetic suspension bearing is the above-mentioned magnetic suspension bearing.

According to another aspect of the present disclosure, there is also provided a compressor including a magnetic suspension bearing, which is the above-mentioned magnetic suspension bearing.

According to another aspect of the present disclosure, an air conditioner is also provided. The air conditioner includes a magnetic suspension bearing, and the magnetic suspension bearing is the above-mentioned magnetic suspension bearing.

It is easy for those skilled in the art to understand that the above advantageous methods can be freely combined and superimposed on the premise of no conflict.

The above are only the preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modification, equivalent replacement and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure. Inside. The above are only the preferred embodiments of the present disclosure. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present disclosure, several improvements and modifications can be made, and these improvements and modifications should also be made. Be regarded as the protection scope of this disclosure.

Claims

A magnetic suspension bearing includes a rotor thrust disc (1), an axial bearing stator (2) and an axial displacement detection device (3). The axial displacement detection device (3) is used for detecting the rotor thrust disc (1). ), the axial bearing stators (2) are respectively arranged on both axial ends of the rotor thrust disc (1), and the axial bearing stators (2) are arranged on at least one of the axial bearing stators (2). An axial displacement detection device (3), the axial displacement detection device (3) and the axial bearing stator (2) where it is located are an integrated structure.
The magnetic suspension bearing according to claim 1, wherein at least one of the axial bearing stators (2) is provided with a mounting hole (4) extending in the axial direction, and the axial displacement detecting device (3) is located in the mounting hole (4). Inside the hole (4) and form an integrated structure with the axial bearing stator (2).
The magnetic suspension bearing according to claim 2, wherein the mounting hole (4) is a through hole; or, the mounting hole (4) is a blind hole, and the opening of the mounting hole (4) faces the rotor thrust plate (1).
The magnetic suspension bearing according to claim 2, wherein the axial displacement detection device (3) is enclosed in the mounting hole (4).
The magnetic bearing according to claim 2, wherein the mounting hole (4) is filled with a plastic-encapsulated column (5), and the axial displacement detection device (3) passes through the plastic-encapsulated column (5) and the shaft The bearing stator (2) forms an integrated structure.
The magnetic suspension bearing according to claim 5, wherein the outlet wire of the axial displacement detection device (3) passes through the mounting hole (4) and is fixed by the plastic-encapsulated column (5).
The magnetic suspension bearing according to claim 5, wherein the end of the axial bearing stator (2) away from the rotor thrust disc (1) is provided with an outlet circuit board (6), and the outlet circuit board (6) corresponds to An escape hole is provided on the plastic-encapsulated column (5).
The magnetic suspension bearing according to claim 7, wherein the outlet circuit board (6) is provided with an outlet terminal (7), and the outlet of the axial displacement detection device (3) is connected through the outlet circuit board (6) To the outlet terminal (7).
The magnetic suspension bearing according to claim 8, wherein the outlet circuit board (6) adopts a multilayer PCB board structure.
The magnetic suspension bearing according to any one of claims 1 to 9, wherein the axial displacement detection device (3) is multiple, and the multiple axial displacement detection devices (3) are arranged in the circumferential direction. Axial bearing on the stator (2).
The magnetic suspension bearing according to claim 10, wherein the axial bearing stator (2) includes a stator core (8) and a stator coil (9), the stator core (8) is provided with a wire slot, and the stator The coil (9) is embedded in the wire slot, and the axial displacement detecting device (3) is arranged on the radially outer side of the wire slot of the stator core (8).
A motor comprising a magnetic suspension bearing, and the magnetic suspension bearing is the magnetic suspension bearing according to any one of claims 1 to 11.
A compressor comprising a magnetic suspension bearing, and the magnetic suspension bearing is the magnetic suspension bearing according to any one of claims 1 to 11.
An air conditioner, comprising a magnetic suspension bearing, and the magnetic suspension bearing is the magnetic suspension bearing according to any one of claims 1 to 11.