Stator assemblies, magnetic bearings and compressors

Abstract

The present application provides a stator assembly, a magnetic suspension bearing, and a compressor. The stator assembly comprises a stator core (1) and a frame (2), wherein the stator core (1) comprises stator teeth (3) and stator slots (4), the stator frame (2) comprises an insulating yoke (5) and an insulating tooth portion (6), the insulating yoke (5) is connected to the insulating tooth portion (6), the insulating tooth portion (6) is wrapped around the stator teeth (3), and the insulating tooth portion (6) comprises a tooth slot for mounting the stator teeth (3), at least one stator frame (2) is provided with a first cooling channel (7), an end of the stator frame (2) away from the first cooling channel (7) is provided with an inlet channel (8), the inlet channel (8) is connected to the first cooling channel (7), and the first cooling channel (7) is connected to the center hole of the stator core (1). According to the stator assembly of the present application, the rotor of the magnetic suspension bearing can be effectively cooled, thereby improving the operational reliability of the magnetic suspension bearing.

Description

Technical Field

[0001] The present application relates to the field of magnetic levitation technology, and in particular to a stator assembly, a magnetic levitation bearing and a compressor. Background Art

[0002] Magnetic bearings utilize electromagnetic force to maintain stable suspension of a rotor system. Compared to traditional mechanical bearings, magnetic bearings offer advantages such as zero friction, zero wear, no lubrication, high speed operation, long life, and low maintenance costs. They hold broad application prospects in high-speed transmission applications such as high-speed motors, high-speed electric spindles, and high-speed flywheel energy storage systems.

[0003] The magnetically levitated rotor operates at high speeds. Due to the electromagnetic field, the rotor cuts through magnetic flux lines within the field, generating significant eddy current losses. Furthermore, friction between the high-speed rotor and the air creates significant windage losses. These losses accumulate on the rotor surface, generating significant heat and causing it to expand and deform. This deformation can disrupt the rotor's dynamic balance and structural strength. Furthermore, the resulting dimensional changes can alter the air gap between the stator and rotor, shifting the magnetic bearing control parameters and causing rotor instability. In severe cases, this can lead to damage to the equipment. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a stator assembly, a magnetic bearing and a compressor, which can effectively dissipate heat from the rotor of the magnetic bearing and improve the operational reliability of the magnetic bearing.

[0005] In order to solve the above problems, the present application provides a stator assembly, including a stator core and a stator frame arranged at both ends of the stator core, the stator core including stator teeth and stator slots, the stator frame including an insulating yoke and an insulating tooth portion, the insulating yoke is connected to the insulating tooth portion, the insulating tooth portion is wrapped around the stator teeth, the insulating tooth portion includes tooth slots for mounting the stator teeth, and a first cooling channel is provided on the end surface of the tooth slot on at least one stator frame away from the slot bottom, and an inlet channel is provided on one end of the stator frame away from the first cooling channel, the inlet channel is connected to the first cooling channel, and the first cooling channel is connected to the center hole of the stator core.

[0006] Preferably, the insulating yoke comprises an annular connecting portion and insulating segments, the insulating segments and insulating teeth are connected to the annular connecting portion and are alternately arranged along the circumference of the annular connecting portion, and the insulating segments are located in the stator slots.

[0007] Preferably, the inlet flow channel is arranged on the insulating yoke and passes through the insulating yoke along the axial direction of the stator core. A second cooling flow channel is provided on the end face of the insulating section away from the annular connecting portion, and the inlet flow channel is connected to the first cooling flow channel through the second cooling flow channel.

[0008] Preferably, first cooling channels are provided on the end surfaces of both side walls of the tooth groove, and the second cooling channels on the insulating section extend circumferentially and communicate with the first cooling channels on the two adjacent side walls of the insulating section.

[0009] Preferably, each second cooling flow channel corresponds to an inlet flow channel.

[0010] Preferably, the stator skeletons at both ends of the stator core are provided with first cooling channels and / or inlet channels.

[0011] Preferably, the stator frames at both ends of the stator core are provided with first cooling channels, the stator frames at both ends of the stator core are sealed and butted, the first cooling channels on the stator frames at both ends are positioned correspondingly, and are combined into a sealed cooling channel.

[0012] Preferably, the inlet flow channel is provided on the insulating tooth portion, and the inlet flow channel axially penetrates the insulating tooth portion to provide a tooth groove side wall of the first cooling flow channel.

[0013] According to another aspect of the present application, a magnetic bearing is provided, comprising a stator assembly, which is the stator assembly described above.

[0014] According to another aspect of the present application, a compressor is provided, comprising the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0015] According to another aspect of the present application, an air conditioner is provided, comprising the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0016] The stator assembly provided in the present application includes a stator core and a stator frame arranged at both ends of the stator core, the stator core including stator teeth and stator slots, the stator frame including an insulating yoke and an insulating tooth portion, the insulating yoke being connected to the insulating tooth portion, the insulating tooth portion being wrapped around the stator teeth, the insulating tooth portion including slots for mounting the stator teeth, a first cooling channel being provided on the end face of the slot on at least one stator frame away from the slot bottom, an inlet channel being provided on the end of the stator frame away from the first cooling channel, the inlet channel being connected to the first cooling channel, and the first cooling channel being connected to the center hole of the stator core. The stator assembly can form a cooling channel on the stator frame for circulating a cooling medium, so that the cooling medium can flow through the cooling channel to the surface of the rotor assembly, effectively cooling the rotor assembly, thereby effectively improving the operating stability of the magnetic levitation bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of a magnetic bearing according to one embodiment of the present application;

[0018] Figure 2This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0019] Figure 3 This is a schematic cross-sectional structural diagram of a magnetic bearing according to an embodiment of the present application.

[0020] The reference numerals indicate:

[0021] 1. Stator core; 2. Stator frame; 3. Stator teeth; 4. Stator slots; 5. Insulating yoke; 6. Insulating teeth; 7. First cooling channel; 8. Inlet channel; 9. Annular connection; 10. Insulating section; 11. Second cooling channel; 12. Rotor assembly. DETAILED DESCRIPTION

[0022] See also Figures 1 to 3 As shown, according to an embodiment of the present application, the stator assembly includes a stator core 1 and a stator frame 2 arranged at both ends of the stator core 1, the stator core 1 includes stator teeth 3 and stator slots 4, the stator frame 2 includes an insulating yoke 5 and an insulating tooth portion 6, the insulating yoke 5 is connected to the insulating tooth portion 6, the insulating tooth portion 6 is wrapped around the stator tooth 3, the insulating tooth portion 6 includes a tooth slot for mounting the stator tooth 3, and a first cooling channel 7 is provided on the end face of the tooth slot on at least one stator frame 2 away from the slot bottom, and an inlet channel 8 is provided at one end of the stator frame 2 away from the first cooling channel 7, the inlet channel 8 is connected to the first cooling channel 7, and the first cooling channel 7 is connected to the center hole of the stator core 1.

[0023] The stator assembly can form a cooling channel on the stator frame 2 for the circulation of cooling medium, so that the cooling medium can reach the stator-rotor gap through the first cooling channel 7 to cool the rotor assembly 12, and can effectively dissipate heat from the rotor assembly 12 of the magnetic bearing, thereby improving the operational reliability of the magnetic bearing.

[0024] In this embodiment, since cooling channels for cooling the rotor assembly 12 are already provided on the stator frame 2, there is no need to provide cooling channels on the stator core 1. This does not damage the structure of the stator core 1, thereby preventing any impact on the magnetic circuit of the stator core 1 and ensuring the performance of the magnetic bearing. Furthermore, compared to processing cooling channels on the stator frame 2, processing cooling channels on the stator frame 2 is easier to implement, less costly, and more efficient.

[0025] In one embodiment, the insulating yoke 5 includes an annular connecting portion 9 and an insulating segment 10. The insulating segment 10 and the insulating tooth portion 6 are connected to the annular connecting portion 9 and are alternately arranged along the circumference of the annular connecting portion 9. The insulating segment 10 is located in the stator slot 4. In this embodiment, the insulating segment 10 is arranged in the stator slot 4 of the stator core 1 to form an insulating isolation between the yoke of the stator core 1 and the coil winding, thereby improving electrical safety and improving the magnetic properties of the coil. The annular connecting portion 9 can serve as a mounting base, so that the stator frame 2 can be maintained as an integral structure, while the setting position of the insulating tooth portion 6 and the insulating segment 10 can meet the requirements of the stator assembly. The annular connecting portion 9 can also protrude axially from the stator core 1, which not only facilitates the processing of cooling channels and the setting of connection ports on the stator frame 2, but also facilitates the installation of external cooling pipes on the annular connecting portion 9.

[0026] In one embodiment, the inlet flow channel 8 is provided on the insulating yoke 5 and penetrates the insulating yoke 5 axially of the stator core 1. A second cooling flow channel 11 is provided on the end surface of the insulating segment 10 away from the annular connecting portion 9. The inlet flow channel 8 is connected to the first cooling flow channel 7 through the second cooling flow channel 11. In this embodiment, the inlet flow channel 8 penetrates the insulating yoke 5 axially, so it can be connected to the second cooling flow channel 11 provided on the end surface of the insulating segment 10. At the same time, the second cooling flow channel 11 is connected to the first cooling flow channel 7. Therefore, after the cooling medium enters the stator skeleton 2 from the inlet flow channel 8, it can flow from the second cooling flow channel 11 to the first cooling flow channel 7, and then flow to the stator-rotor gap through the first cooling flow channel 7, thereby effectively cooling the rotor assembly 12. After the stator frame 2 is installed on the stator core 1, the first cooling channel 7 and the second cooling channel 11 on the stator frame 2 are both located in the axial middle part of the stator core 1. Therefore, after the cooling medium flows out of the first cooling channel 7, it can reach the middle position of the air gap of the rotor assembly 12, thereby forming a more uniform cooling effect on the rotor assembly 12.

[0027] In one embodiment, first cooling channels 7 are provided on the end surfaces of both side walls of the tooth slot. Second cooling channels 11 on the insulating segment 10 extend circumferentially and communicate with the first cooling channels 7 on the two adjacent side walls of the insulating segment 10. After the cooling medium reaches the second cooling channels 11 through the inlet channel 8, it flows circumferentially to both sides of the second cooling channels 11, then passes through the first cooling channels 7 on both circumferential sides of the second cooling channels 11 to reach the stator-rotor gap, thereby cooling the rotor assembly 12.

[0028] In one embodiment, each second cooling channel 11 corresponds to an inlet channel 8. Since a second cooling channel 11 is provided on the insulating segment 10 of each insulating yoke 5, it is equivalent to that each insulating segment 10 is provided with an inlet channel 8 for conveying the cooling medium. Each inlet channel 8 forms a cooling channel unit with the second cooling channel 11 and the first cooling channel 7 connected thereto. The multiple cooling channel units are evenly spaced along the circumference of the stator core 1 to achieve uniform cooling of the rotor assembly 12.

[0029] In one embodiment, the second cooling channel 11 may be provided on some insulating segments 10 , while not provided on some insulating segments 10 . In this case, only the side wall ends of the insulating teeth 6 adjacent to these insulating segments 10 are provided with the first cooling channel 7 .

[0030] In one embodiment, the stator skeleton 2 at both ends of the stator core 1 is provided with a first cooling channel 7 and / or an inlet channel 8 .

[0031] In one embodiment, a first cooling channel 7 and an inlet channel 8 are respectively provided on the stator frame 2 at the first end of the stator core 1, and only an inlet channel 8 is provided on the stator frame 2 at the second end. The inlet channel 8 is connected to the first cooling channel 7 at the first end. The inlet channel 8 on the stator frame 2 at both ends of the stator core 1 simultaneously supplies cooling medium to the first cooling channel 7.

[0032] In one embodiment, a first cooling channel 7 is provided on the stator frame 2 at the first end of the stator core 1, and only an inlet channel 8 is provided on the stator frame 2 at the second end. The inlet channel 8 is connected to the first cooling channel 7 at the first end to supply cooling medium to the first cooling channel 7.

[0033] In one embodiment, a first cooling channel 7 and an inlet channel 8 are respectively provided on the stator frame 2 at the first end of the stator core 1, and a first cooling channel 7 and an inlet channel 8 are respectively provided on the stator frame 2 at the second end. The cooling medium can enter the respective first cooling channels 7 through the respective inlet channels 8 on the stator frames 2 at both ends, and then enter the stator-rotor gap to cool the rotor assembly 12.

[0034] In one embodiment, first cooling channels 7 are provided on the stator frames 2 at both ends of the stator core 1. The stator frames 2 at both ends of the stator core 1 are sealed and butted together, with the first cooling channels 7 on the stator frames 2 at both ends aligned and combined to form a sealed cooling channel. Cooling medium flows in through the inlet channel 8, flows through the sealed cooling channel, and is ejected along the cooling channel outlet proximate to the surface of the rotor assembly 12, cooling it. This effectively addresses the technical issue of heat generation due to bearing wear and tear in the rotor.

[0035] The first cooling channel 7 may extend in the radial direction of the stator teeth 3 , so as to vertically spray the surface of the rotor assembly 12 to cool the rotor assembly 12 .

[0036] In one embodiment, an inlet flow channel 8 is provided on the insulating tooth portion 6. The inlet flow channel 8 axially penetrates the sidewall of the tooth groove of the insulating tooth portion 6, where the first cooling flow channel 7 is provided. In this embodiment, there is no need to provide a second cooling flow channel. The inlet flow channel 8 is directly used to supply cooling medium to the first cooling flow channel 7, thereby increasing the air supply pressure and improving the cooling effect.

[0037] See also Figures 1 to 3 As shown, according to an embodiment of the present application, the magnetic bearing includes a stator assembly, which is the stator assembly mentioned above.

[0038] The magnetic bearing includes a stator core 1, a stator frame 2, a bearing coil and a rotor assembly 12. The stator core 1 is an annular tooth slot structure with multiple stator teeth 3 and stator slots 4 staggered along the circumference. The stator frame 2 is an injection molded part with a similar structure to the stator core 1 and has multiple tooth slot insulation corresponding to the stator slots of the stator core 1. The two stator frames 2 are symmetrically sleeved on the two end faces of the stator core 1 of the magnetic bearing, and can completely cover the stator slots 4 of the stator core 1 to form an insulation layer between the bearing coil and the stator core 1; the bearing coil passes through the slots of the stator frame 2 and the stator core 1 and is wound on the tooth slot insulation. A controllable current is passed into the bearing coil, which can provide controllable magnetic attraction for the radial magnetic bearing, acting on the rotor assembly 12 to achieve suspension control of the rotor assembly 12.

[0039] According to an embodiment of the present application, the compressor includes the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0040] According to an embodiment of the present application, an air conditioner includes the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0041] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0042] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A stator assembly, characterized in that: The invention comprises a stator core (1) and a stator frame (2) arranged at both ends of the stator core (1), wherein the stator core (1) comprises stator teeth (3) and stator slots (4), and the stator frame (2) comprises an insulating yoke (5) and an insulating tooth portion (6), wherein the insulating yoke (5) is connected to the insulating tooth portion (6), and the insulating tooth portion (6) is wrapped around the stator tooth (3), and the insulating tooth portion (6) comprises a tooth slot for mounting the stator tooth (3), and a first cooling channel (7) is provided on the end face of the tooth slot on at least one of the stator frames (2) away from the slot bottom, and an inlet channel (8) is provided at one end of the stator frame (2) away from the first cooling channel (7), wherein the inlet channel (8) is connected to the first cooling channel (7), and the first cooling channel (7) is connected to the center hole of the stator core (1); The stator assembly is used for a magnetic bearing; the first cooling channel (7) extends along the radial direction of the stator teeth (3) and passes through the ends of the stator teeth (3); the first cooling channel (7) is located in the axial middle of the stator core (3); and the inlet channel (8) is used for allowing a cooling medium to flow in.

2. The stator assembly according to claim 1, characterized in that The insulating yoke (5) comprises an annular connecting portion (9) and an insulating segment (10), the insulating segment (10) and the insulating tooth portion (6) are connected to the annular connecting portion (9) and are alternately arranged along the circumference of the annular connecting portion (9), and the insulating segment (10) is located in the stator slot (4).

3. The stator assembly according to claim 2, characterized in that The inlet flow channel (8) is arranged on the insulating yoke (5) and penetrates the insulating yoke (5) along the axial direction of the stator core (1); a second cooling flow channel (11) is provided on the end surface of the insulating section (10) away from the annular connecting portion (9); and the inlet flow channel (8) is connected to the first cooling flow channel (7) through the second cooling flow channel (11).

4. The stator assembly according to claim 3, characterized in that The first cooling channels (7) are provided on the end surfaces of the two side walls of the tooth groove, and the second cooling channels (11) on the insulating section (10) extend in the circumferential direction and communicate with the first cooling channels (7) on the two adjacent side walls of the insulating section (10).

5. The stator assembly according to claim 4, characterized in that Each of the second cooling channels (11) corresponds to one of the inlet channels (8).

6. The stator assembly according to claim 1, characterized in that The stator skeleton (2) at both ends of the stator core (1) is provided with the first cooling flow channel (7) and / or the inlet flow channel (8).

7. The stator assembly according to claim 6, characterized in that The stator frames (2) at both ends of the stator core (1) are both provided with the first cooling channels (7), and the first cooling channels (7) on the stator frames (2) at both ends are positioned correspondingly and are combined into a sealed cooling channel.

8. The stator assembly according to claim 1, wherein: The inlet flow channel (8) is arranged on the insulating tooth portion (6), and the inlet flow channel (8) penetrates the insulating tooth portion (6) in the axial direction to arrange the tooth groove side wall of the first cooling flow channel (7).

9. A magnetic bearing, comprising a stator assembly, characterized in that: The stator assembly is the stator assembly according to any one of claims 1 to 8.

10. A compressor, characterized in that: The stator assembly comprises the stator assembly according to any one of claims 1 to 8 or the magnetic bearing according to claim 9.

Images