An axial magnetic bearing and stator tooth integration method

Abstract

The application discloses an axial magnetic bearing and stator tooth integrated method and relates to the technical field of motor equipment, which comprises a stator tooth, a reinforcing ring and a bearing shell, the stator tooth is provided with a plurality of stator teeth, the reinforcing ring is sleeved on the plurality of stator teeth, the middle part of the bearing shell is provided with a through hole, the plurality of stator teeth are arranged in an equidistant manner in the inside of the bearing shell, the upper and lower ends of the inner side wall of the bearing shell are respectively provided with the same number of containing grooves as the stator teeth, the upper and lower ends of the plurality of stator teeth are respectively embedded in the containing grooves at the corresponding positions, and the through hole of the bearing shell is provided with a limiting inner wall, the limiting inner wall, the bearing shell and the containing grooves are matched in the scheme to form a structure support that supports the upper and starts the lower; in addition, the reinforcing ring structure is designed to further maintain the stability and reliability of the bearing tooth integrated structure, the scheme is simple in design, easy to produce and manufacture and high in practicability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor equipment, in particular to an axial magnetic bearing and a stator tooth integration method. BACKGROUND

[0002] With the increasing requirement for the power performance of electric vehicles, the requirement for the torque density and power density of new energy motors is also gradually increasing. The torque density of an axial magnetic field motor is about 30% higher than that of a traditional radial motor, and the axial magnetic field motor can output greater torque.

[0003] Bearings are important components of rotating equipment, and are present in various rotating machines from small handheld devices to heavy industrial systems. Bearings are an important part of modern mechanical equipment, and their main function is to support the rotating body of a machine, reduce the friction coefficient during movement, and ensure the rotation accuracy. Bearings have many types, such as sliding bearings, joint bearings, rolling bearings, deep groove ball bearings, angular contact ball bearings, self-aligning ball bearings, thrust ball bearings, and bidirectional thrust angular contact ball bearings. Rolling bearings have the advantages of high movement accuracy, easy assembly and lubrication, and are widely used in the fields of aviation, shipping, rail transportation and new energy power generation. The running state of rolling bearings is closely related to the reliability and safety of mechanical systems.

[0004] Axial magnetic field motors are divided into single-rotor single-stator structures, double-stator single-rotor Kaman structures, single-stator double-rotor Torus-NN structures, single-stator double-rotor Torus-NS structures, and multi-disc structures. Among them, the single-stator double-rotor Torus-NS structure avoids the internal axial magnetic pull of the single-rotor single-stator structure, reduces the wear of the bearing, and the stator of the single-stator double-rotor Torus-NS structure is located between the two rotors and the magnetic circuit is in series. By using a stator core without a yoke, the stator iron loss can be reduced, and the motor efficiency and power density can be improved.

[0005] Theoretically, the torque of a radial motor (our commonly used traditional motor) is proportional to the square of the outer diameter of the motor and the height of the motor, that is, proportional to the volume of the motor. The torque of an axial magnetic field is proportional to the cube of the outer diameter of the motor. This characteristic means that the torque of an axial magnetic field motor will be much higher than that of a radial motor under the condition of D>>L (the outer diameter is much larger than the height). This characteristic leads to a series of flat disc-type motor products with high torque density.

[0006] Since the axial bearing adopts the yokeless stator design, the stator teeth are independent, that is, there is no yoke to connect and no yoke to close the magnetic circuit. The magnetic field directly penetrates from one side of the tooth to the other side, forming a closed loop through the rotor. Because there is no stator yoke, the stator teeth naturally become an independent "split structure". It has the following advantages: this structure has no stator yoke, which eliminates the yoke magnetic circuit saturation and loss, and is beneficial to miniaturization and efficiency improvement; second: the split structure makes each winding can be independently wound into shape before assembly, which is beneficial to large-scale automatic production; third: independent winding, through "wire arrangement design", the space can be fully utilized to make the winding compact and full, high slot fill rate is possible, high slot fill rate means that more copper can be used under the same size, so that the winding copper loss is reduced, and the torque density is further improved. The core problem of this process is "how to integrate the split stator teeth into a whole". SUMMARY

[0007] The present application aims at the deficiencies of the prior art, and provides an axial magnetic bearing,

[0008] The application discloses an axial magnetic bearing, which comprises a stator tooth, a reinforcing ring and a bearing shell, wherein the stator tooth is provided with a plurality of reinforcing rings, the reinforcing ring is sleeved on the plurality of stator teeth, and the bearing shell is provided with a through hole in the middle part.

[0009] Further, the reinforcing ring is composed of a plurality of tooth sleeves and an inner ring, the number of the tooth sleeves is the same as that of the stator teeth, each tooth sleeve is correspondingly sleeved on one stator tooth, and one end of the plurality of tooth sleeves is connected to the inner ring.

[0010] Further, the reinforcing ring is provided with two, and the two reinforcing rings are sleeved on the upper part and the lower part of the stator tooth respectively.

[0011] Further, the limiting inner wall comprises a wall ring and a vertical rod, the vertical rod is provided with a plurality of vertical rods which are vertically arranged on the inner side wall of the bearing shell, one vertical rod is arranged between the adjacent two stator teeth, and the wall ring is connected to the top of the plurality of vertical rods.

[0012] Further, the bearing shell is composed of an upper shell and a lower shell, a connecting lug is correspondingly arranged on the outer side of the upper shell and the lower shell, and the accommodating groove is arranged on the inner surface of the upper shell and the lower shell.

[0013] The stator tooth integration method comprises the following steps:

[0014] S1: a plurality of stator teeth are arranged, and a winding is wound on each stator tooth;

[0015] S2: two reinforcing rings are respectively correspondingly sleeved on the plurality of stator teeth, so that the plurality of stator teeth are arranged in a ring shape;

[0016] S3: the plurality of stator teeth arranged in a ring shape are correspondingly installed on the lower shell, and the lower ends of the stator teeth are embedded into the accommodating grooves in the lower shell;

[0017] S4: the upper shell is covered above the lower shell, and the accommodating grooves of the upper shell are aligned on the plurality of stator teeth;

[0018] S5: the upper shell and the lower shell are fixed by using bolts passing through the connecting lugs outside the upper shell and the lower shell.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] In the present scheme, the bearing shell is designed according to the size parameters of the stator teeth, including a wrapping support structure combined by the through hole, the stator teeth and the M accommodating grooves, so as to realize the positioning and fastening of the stator teeth. The support property is reflected in the cooperation of the outer wall of the fixed disc with the motor shell and the cooperation of the inner wall with the bearing chamber, which provides the structural support of upper and lower links. In addition, the reinforcing ring structure is designed, which contains a plurality of fixed buckle structures corresponding to the number and position of the accommodating grooves in the bearing shell structure, thereby maintaining the stability and reliability of the integrated structure of the stator teeth. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a split structure schematic diagram of the present scheme;

[0022] Figure 2 is a state schematic diagram of the upper sleeving of the reinforcing ring of the stator teeth;

[0023] Figure 3 is a sectional view of the present scheme;

[0024] Figure 4 is a structure schematic diagram of the lower shell.

[0025] Reference signs: stator teeth 1, reinforcing ring 2, tooth sleeve 21, inner ring 22, bearing shell 3, upper shell 31, lower shell 32, connecting lug 33, accommodating groove 4, limiting inner wall 5, wall ring 51, vertical rod 52. DETAILED DESCRIPTION

[0026] The accompanying drawings are combined with the detailed description Figures 1-4As shown, an axial magnetic bearing comprises a plurality of stator teeth 1, a reinforcing ring 2 and a bearing shell 3, the number of stator teeth 1 can be increased or decreased according to the size of the bearing, and the minimum number of stator teeth 1 is not less than 3, the reinforcing ring 2 is sleeved on the plurality of stator teeth 1, and the bearing shell 3 is provided with a through hole in the middle, the plurality of stator teeth 1 are arranged in the inside of the bearing shell 3 in a ring shape, the upper and lower ends of the inner wall of the bearing shell 3 are respectively provided with a plurality of accommodating grooves 4 corresponding to the number of stator teeth 1, and the upper and lower ends of the plurality of stator teeth 1 are respectively embedded in the corresponding accommodating grooves 4, and the bearing shell 3 is provided with a limiting inner wall 5 at the through hole.

[0027] The reinforcing ring 2 is provided with two reinforcing rings 2, and the two reinforcing rings 2 are respectively sleeved on the upper and lower parts of the stator teeth 1, and the reinforcing ring 2 can fix the winding on the stator teeth 1 and stabilize the spacing between the plurality of stator teeth 1, thereby playing a preliminary stabilizing role.

[0028] The reinforcing ring 2 is composed of a plurality of tooth sleeves 21 and an inner ring 22, the number of tooth sleeves 21 is the same as the number of stator teeth 1, each tooth sleeve 21 is correspondingly sleeved on a stator tooth 1, one end of each tooth sleeve 21 is connected to the inner ring 22, the stator teeth 1 are fixed by the tooth sleeves 21, thereby ensuring the stability of the single stator tooth 1, and the plurality of tooth sleeves 21 are connected to each other by the inner ring 22, thereby achieving the limiting and fixing of the plurality of stator teeth 1, each tooth sleeve 21 is fixed on a stator tooth of the same size, and each tooth sleeve 21 has a connection relationship with the inner ring 22, forming two reinforcing rings 2, which can fix the stator teeth 1 from moving left and right in cooperation with the bearing shell 3.

[0029] The limiting inner wall 5 comprises a wall ring 51 and a vertical rod 52, a plurality of vertical rods 52 are provided, the vertical rods 52 are vertically arranged on the inner side wall of the bearing shell 3, one vertical rod 52 is arranged between adjacent two stator teeth 1, and the wall ring 51 is connected to the top of the plurality of vertical rods 52. The vertical rod 52 can limit the stator teeth 1 in the bearing shell 3, thereby further improving the overall structural stability of the product, and the vertical rod 52 is between the two stator teeth 1, which can play a certain blocking role.

[0030] The bearing shell 3 is composed of an upper shell 31 and a lower shell 32, a connecting lug 33 is correspondingly arranged on the outer side of the upper shell 31 and the lower shell 32, and the accommodating grooves 4 are arranged on the inner surfaces of the upper shell 31 and the lower shell 32. The split structure of the bearing shell 3 can facilitate the assembly and maintenance of the equipment, the upper shell 31 and the lower shell 32 can be fixed by bolts during installation, the upper shell 31 and the lower shell 32 are arranged in the same structure, which can reduce the production cost of the bearing shell 3, and the upper shell 31 and the lower shell 32 of the same structure are spliced to form a complete shell.

[0031] This solution addresses the issue of integrating the segmented stator teeth 1 into a single unit in an axial magnetic bearing, thereby ensuring high-precision positioning of the axial magnetic bearing between the two rotors. Based on the known dimensional parameters of the stator teeth 1, a bearing housing 3 structure is designed, comprising a wrapping support structure combining through holes, stator teeth 1, and M receiving grooves 4 to achieve positioning and fastening of the stator teeth 1. Its support is manifested in the outer wall of this fixed disk cooperating with the motor housing and the inner wall cooperating with the bearing chamber, providing structural support that connects the upper and lower parts. Secondly, a reinforcing ring 2 structure is designed, which includes several fixing buckle structures corresponding to the number and position of the receiving grooves 4 in the bearing housing 3 structure, thereby maintaining the stability and reliability of the integrated structure of the stator teeth 1. This application provides a method for positioning and fastening the core stator component in bearing manufacturing. The design is simple, easy to manufacture, and highly practical, providing theoretical assistance for the subsequent design and large-scale production of axial magnetic bearings.

[0032] A method for integrating stator teeth of an axial magnetic bearing includes the following steps:

[0033] S1: Set several stator teeth 1, and wind the windings onto several stator teeth 1 respectively;

[0034] S2: The two reinforcing rings 2 are respectively fitted onto several stator teeth 1, so that the several stator teeth 1 are arranged in a ring.

[0035] S3: Install several stator teeth 1 arranged in a ring on the lower shell 32, and embed the lower end of the stator teeth 1 into the receiving groove 4 in the lower shell 32.

[0036] S4: Cover the upper shell 31 over the lower shell 32, and align the receiving groove 4 of the upper shell 31 with several stator teeth 1;

[0037] S5: The upper shell 31 and the lower shell 32 are fixed by using bolts passing through the connecting ears 33 on the outside of the upper shell 31 and the lower shell 32.

[0038] In the description of the application, it is required to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the application. In addition, the features defined with "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0040] In the description of the application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. An axial magnetic bearing, characterized in that, The bearing housing includes stator teeth (1), reinforcing rings (2) and bearing housing (3). Several stator teeth (1) are provided, and the reinforcing rings (2) are sleeved on several stator teeth (1). A through hole is provided in the middle of the bearing housing (3). Several stator teeth (1) are arranged in a ring at equal intervals inside the bearing housing (3). The upper and lower ends of the inner sidewall of the bearing housing (3) are respectively provided with receiving grooves (4) with the same number as the stator teeth (1). The upper and lower ends of several stator teeth (1) are respectively embedded in the receiving grooves (4) at the corresponding positions. A limiting inner wall (5) is provided at the through hole of the bearing housing (3). The reinforcing ring (2) is composed of several toothed sleeves (21) and an inner ring (22). The number of toothed sleeves (21) is the same as the number of stator teeth (1). Each toothed sleeve (21) is fitted onto a stator tooth (1). One end of several toothed sleeves (21) is connected to the inner ring (22). The limiting inner wall (5) includes a wall ring (51) and vertical rods (52). Several vertical rods (52) are provided. The vertical rods (52) are vertically provided on the inner side wall of the bearing housing (3). A vertical rod (52) is provided between two adjacent stator teeth (1). The wall ring (51) is connected to the top of several vertical rods (52).

2. An axial magnetic bearing according to claim 1, characterized in that, Two reinforcing rings (2) are provided, and the two reinforcing rings (2) are respectively sleeved on the upper and lower parts of the stator teeth (1).

3. An axial magnetic bearing according to claim 1, characterized in that, The bearing housing (3) is composed of an upper housing (31) and a lower housing (32). A connecting lug (33) is provided on the outer side of both the upper housing (31) and the lower housing (32). The receiving groove (4) is respectively provided on the inner surface of the upper housing (31) and the lower housing (32).

4. The stator gear integration method for the axial magnetic bearing according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Set several stator teeth (1), and wind the windings onto several stator teeth (1) respectively; S2: The two reinforcing rings (2) are respectively fitted onto several stator teeth (1) so that the several stator teeth (1) are arranged in a ring. S3: Install several stator teeth (1) arranged in a ring on the lower shell (32) and embed the lower end of the stator teeth (1) into the receiving groove (4) in the lower shell (32); S4: Cover the upper shell (31) over the lower shell (32) and align the receiving groove (4) of the upper shell (31) with several stator teeth (1); S5: Use bolts to pass through the connecting ears (33) on the outside of the upper shell (31) and the lower shell (32) to fix the upper shell (31) and the lower shell (32).

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