Stator core fixing structure and motor

Abstract

The utility model relates to a fixing structure of a stator core, the stator core is provided with a through hole penetrating through the stator core, and the fixing structure comprises a base, a stay bolt and a fastening bolt; the base is provided with a first bolt hole and a second bolt hole, the stay bolt passes through the through hole and is connected with the first bolt hole, and the fastening bolt is connected with the second bolt hole so as to fix the pressing ring on the stator iron core. Through the fixing structure, the loss of the stator core can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of generator manufacturing, and more specifically, to a fixing structure of a stator core and an electric machine. Background Art

[0002] The stator core is composed of a non-crystalline section of the core, a silicon steel sheet material section, and a retaining ring. In a conventional electric machine, the stator core of the electric machine and the machine base are generally fixed by methods such as hot shrinking with interference fit, welding, or bolt connection and key connection to transmit torque. With the improvement of the power density of the electric machine, currently, high-power density electric machines generally use an aluminum alloy machine base. Since it is difficult to weld between iron and aluminum, only the interference fit amount can be increased or bolt connection can be used. However, too large an interference fit amount will cause the machine base to crack during hot shrinking. And the existing methods generally use bolts to fix the retaining rings at both ends of the electric machine, which requires the electric machine core to have good integrity, otherwise, the laminations may come loose during operation.

[0003] In addition, with the development of electric machines towards high-speed operation, the iron loss of the electric machine increases exponentially with the speed. Since the non-crystalline material core can reduce the iron loss of the electric machine by more than 70%, it has become a hot topic in the application research of current high-speed electric machines. However, the non-crystalline material loss is extremely sensitive to the hot shrinking stress. In the case of a large interference fit amount, the loss will increase rapidly due to the increase in the core stress. Moreover, the non-crystalline material is brittle, and a large interference fit amount may cause the non-crystalline material to break. In addition, the non-crystalline material cannot be welded. The above properties determine that a large interference fit amount hot shrinking connection cannot be used between the non-crystalline core and the machine base, and other methods have to be found. Currently, only the methods of grinding or bonding can be used. The method of grinding controls a very small interference fit amount between the non-crystalline core and the machine base. However, if the interference fit amount is too small, the torque output of high power and high power density cannot be achieved, and the method of bonding involves the aging problem of the adhesive.

[0004] The prior art 1, CN107769429A, discloses a fixing structure of a stator core of an aluminum machine base electric machine, including: an aluminum machine base, in which a stator core is hot shrunk. An annular baffle is provided on the inner surface of the aluminum machine base. On the annular baffle, a plurality of fixing holes are circumferentially and evenly distributed with the rotation center of the electric machine rotor as the center of the circle. Threaded holes corresponding to the fixing holes one by one are opened on the end surface of the stator core facing the annular baffle. The fixing holes and the threaded holes are fixedly connected by bolts. The prior art 1 uses bolts to connect the core retaining ring at one end of the core, solving the problems of high manufacturing cost, complex process, and high rejection rate of the existing fixing structure between the aluminum machine base and the stator core. Fixing the stator core only at one end requires the stator core to have very good integrity, otherwise, the laminations may come loose during long-term operation.

[0005] Prior Art II: CN103051082A discloses a stator core fixing structure and a box-type motor, and discloses a stator core fixing structure, including: a machine base, on which a machine base partition is provided; a stator core in clearance fit with the machine base partition; a fixing device with a card slot provided thereon that cooperates with the stator core reinforcing ribs of the stator core, and the fixing device is detachably connected to the machine base partition and the core retaining ring of the stator core respectively. In the stator core fixing structure of the present invention, the stator core and the machine base partition of the machine base adopt a clearance fit, and the core can be installed on the machine base without heating. Then, a fixing device is used. The fixing device is provided with a card slot, and the card slot contacts the stator core reinforcing ribs to limit the radial and circumferential positions of the core; the fixing device is detachably connected to the machine base partition and the core retaining ring of the stator core respectively to ensure that the relative positions of the machine base and the stator core remain unchanged. This solves the technical problems in the prior art that the fixing cost of the motor stator core is high, disassembly and maintenance are inconvenient, and there are potential quality hazards. In Prior Art II, bolts are also used to fix the retaining rings at both ends of the core, and reinforcing ribs need to be welded on the back of the core to maintain the integrity of the core.

[0006] That is, the prior art cannot solve the technical problem of high core loss. Summary of the Utility Model

[0007] The present utility model discloses a fixing structure of a stator core for reducing the loss of the stator core to overcome the above-mentioned defects.

[0008] To solve the above-mentioned technical problems, the technical solution of the present utility model is as follows:

[0009] A fixing structure of a stator core, wherein through holes penetrating the stator core are provided on the stator core, and the fixing structure includes a machine base, a tie rod bolt, and a set screw; first bolt holes and second bolt holes are provided on the machine base, the tie rod bolt passes through the through holes and is connected to the first bolt holes, and the set screw is connected to the second bolt holes to fix the retaining ring on the stator core.

[0010] Preferably, the amorphous segment of the core, the silicon steel sheet material segment, and the retaining ring on the stator core are sequentially connected by an adhesive. The advantage of this design is that the amorphous segment of the core, the silicon steel sheet material segment, and the retaining ring are bonded together to ensure the structural stability of the core.

[0011] Preferably, a layer of curing agent is sprayed on the surface of the core. Through this design, the torque transmission capacity of the core is increased.

[0012] Preferably, a layer of curing agent is sprayed on the surface of the machine base. Through this design, the torque transmission capacity of the core is increased.

[0013] Preferably, a layer of curing agent is sprayed on the surfaces of both the machine base and the core

[0014] Preferably, a protrusion is provided on the side wall of the machine base, and the first bolt hole is provided on the protrusion.

[0015] Preferably, the protrusion is provided on the inner wall of the machine base.

[0016] Preferably, the protrusion is provided on the outer wall of the base.

[0017] Disclosed is a motor, including a fixing structure of a stator core.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. The pull rod bolt fixes the stator core on the machine base to ensure the integrity of the core. At the same time, the retaining screw is used to fix the pressure ring, which can achieve large torque transmission when there is no interference or extremely small interference between the core and the machine base, can greatly reduce the stress of the amorphous core in the machine base, thereby reducing the core loss, and effectively preventing the cracking of the machine base when the machine base is hot-fitted with a large interference.

[0020] 2. The structure is simple and the disassembly and assembly are convenient. Description of the Drawings

[0021] Figure 1 It is a schematic installation structure diagram of a fixing structure of a stator core of the present utility model in an outer-rotor motor;

[0022] Figure 2 It is an installation structure diagram of a fixing structure of a stator core of the present utility model in an inner-rotor motor;

[0023] Figure 3 It is a schematic structure diagram of the stator core fixing structure in Comparative Document 1. Detailed Embodiments

[0024] To clearly illustrate the technical features of the present solution, the present utility model will be elaborated in detail below through specific embodiments and in conjunction with its drawings.

[0025] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0026] In addition, in the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0027] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "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 present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0029] Embodiment 1

[0030] As Figures 1 - 2As shown in the figure, a fixing structure of a stator core is disclosed. A through hole penetrating the stator core 4 is provided on the stator core 4. The fixing structure includes a frame 1, a tie rod bolt 3, and a set screw 2. The frame 1 is provided with a first bolt hole and a second bolt hole. The tie rod bolt 3 passes through the through hole and is connected to the first bolt hole, and the set screw 2 is connected to the second bolt hole to fix the retaining ring 43 on the stator core.

[0031] In this embodiment, the fixing structure of the stator core 4 specifically includes an installation hole provided on the stator core 4, which can specifically be a through hole penetrating the stator core 4. The stator core 4 is fixedly connected to the frame 1. Two bolt holes for fixing the stator core are provided on the frame 1, namely a first bolt hole and a second bolt hole. The tie rod bolt 3 passes through the through hole and cooperates with the first bolt hole to fix the centering core 4 to the frame 1. At the same time, a set screw 2 is arranged in the second bolt hole. By turning the set screw 2, the set screw 2 fixes the retaining ring 43, effectively preventing the rotation of the core 4 and ensuring the integrity of the core 4 to prevent the core from splitting.

[0032] In this embodiment, by providing two screw holes on the frame and using a tie rod bolt and a set screw, the core is fixedly connected to the frame. The tie rod bolt fixes the stator core to the frame to ensure the integrity of the core. At the same time, the retaining ring is fixed using a set screw, which can achieve large torque transmission when there is no interference or very small interference between the core and the frame, can greatly reduce the stress of the amorphous core in the frame, thereby reducing core loss, and effectively preventing the frame from cracking when the frame is hot-fitted with a large interference.

[0033] In order to facilitate fixing the stator core with the tie rod bolt, a nut can be provided at one end of the tie rod bolt.

[0034] Embodiment 2

[0035] A fixing structure of a stator core is disclosed. A through hole penetrating the stator core 4 is provided on the stator core 4. The fixing structure includes a frame 1, a tie rod bolt 3, and a set screw 2. The frame 1 is provided with a first bolt hole and a second bolt hole. The tie rod bolt 3 passes through the through hole and is connected to the first bolt hole, and the set screw 2 is connected to the second bolt hole to fix the retaining ring 43 on the stator core.

[0036] The difference between this embodiment and Embodiment 1 is that: the stator core 4 is composed of three parts: a core amorphous section 42, a silicon steel sheet material section 41, and a retaining ring 43. Specifically, the core amorphous section 42, the silicon steel sheet material section 41, and the retaining ring 43 are preformed by an adhesive method, and specifically, the core amorphous section 42, the silicon steel sheet material section 41, and the retaining ring 43 can be fixed by an adhesive. Through this design, the stability of the core structure is ensured.

[0037] Embodiment 3

[0038] Disclose a fixing structure of a stator core. A through hole penetrating the stator core 4 is provided on the stator core 4. The fixing structure includes a frame 1, a tie rod bolt 3 and a set screw 2. The frame 1 is provided with a first bolt hole and a second bolt hole. The tie rod bolt 3 passes through the through hole and is connected to the first bolt hole, and the set screw 2 is connected to the second bolt hole to fix the retaining ring 43 on the stator core.

[0039] The difference between this embodiment and Embodiment 1 is that: to further increase the torque transmission capacity of the stator core 4, a layer of curing agent can be sprayed on the surface of the stator core 4. It can also be spraying a layer of curing agent on the surface of the frame 1, or spraying a layer of curing agent on the surfaces of both the stator core 4 and the frame 4.

[0040] Embodiment 4

[0041] Disclose a fixing structure of a stator core. A through hole penetrating the stator core 4 is provided on the stator core 4. The fixing structure includes a frame 1, a tie rod bolt 3 and a set screw 2. The frame 1 is provided with a first bolt hole and a second bolt hole. The tie rod bolt 3 passes through the through hole and is connected to the first bolt hole, and the set screw 2 is connected to the second bolt hole to fix the retaining ring 43 on the stator core.

[0042] The difference between this embodiment and Embodiment 1 is that: to facilitate the setting of the first bolt hole on the frame 1, specifically, a protrusion can be provided on the side wall of the frame 1, and the first bolt hole is provided on the protrusion.

[0043] Specifically, the protrusion can be provided on the inner wall of the frame 1, so that this fixing structure is applicable to the fixing of the stator of an inner rotor motor.

[0044] The protrusion can also be provided on the outer wall of the frame 1, so that this fixing structure is applicable to the fixing of the stator of an outer rotor motor.

[0045] Embodiment 5

[0046] Disclose a motor, including a fixing structure of a stator core. In the motor, the fixing structure is used to fix the stator core, thereby improving the stability of the motor.

[0047] Like or similar reference numerals in the accompanying drawings correspond to like or similar components; the positional relationships depicted in the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. Obviously, the above-described embodiments of the present utility model are merely examples for clearly illustrating the present utility model and are not limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A stator core fixing structure, characterized in that: The fixing structure includes a machine base, a tie rod bolt and a fixing bolt; the stator core is provided with a through hole penetrating the stator core; the machine base is provided with a first bolt hole and a second bolt hole, the tie rod bolt passes through the through hole and is connected to the first bolt hole, and the fixing bolt is connected to the second bolt hole to fix the pressure ring on the stator core.

2. A stator core fixing structure according to claim 1, characterized in that: The amorphous iron core section, the silicon steel sheet material section and the pressing ring on the stator iron core are connected in sequence by adhesive.

3. The fixing structure of a stator core according to claim 1, characterized in that: A layer of curing agent is sprayed on the surface of the core.

4. The stator core fixing structure according to claim 1, characterized in that: A layer of curing agent is sprayed on the surface of the machine base.

5. The stator core fixing structure according to claim 1, characterized in that: A layer of curing agent is sprayed on the surface of the machine base and the iron core.

6. The stator core fixing structure according to claim 1, characterized in that: A protrusion is arranged on the side wall of the machine base, and the first bolt hole is arranged on the protrusion.

7. A stator core fixing structure according to claim 6, characterized in that: The protrusion is arranged on the inner wall of the base.

8. The stator core fixing structure according to claim 6, characterized in that: The protrusion is arranged on the outer wall of the base.

9. The stator core fixing structure according to claim 1, characterized in that: One end of the pull rod bolt is provided with a nut.

10. A motor, characterized in that: A stator core fixing structure comprising the stator core fixing structure according to any one of claims 1 to 9.

Images