Motor

Abstract

The utility model discloses a motor, which comprises a first shell, a second shell, a stator assembly, a rotor, a motor shaft and a bearing, and is characterized in that the stator assembly comprises a stator core and a stator winding, and the first shell and the second shell are both made of plastic materials; the bottom of an inner cavity of the first shell is provided with a stator supporting table used for supporting the lower end face of the stator iron core, and the inner wall of the first shell is in close fit with the peripheral wall of the stator iron core. The lower end of the second shell is inserted into the inner cavity of the first shell and is tightly pressed on the upper end surface of the stator core, and the outer wall of the lower end of the second shell is tightly matched with the inner wall of the upper end of the first shell. The motor provided by the utility model is simple in process, high in concentricity and good in universality.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more particularly to a motor. Background Art

[0002] Currently, there are two main types of motors on the market: metal-cased motors, which are expensive and lack rust resistance; and plastic-encapsulated motors, which are manufactured by placing the stator into a pre-molded mold. These are low-cost and waterproof. However, during the manufacture of plastic-encapsulated motors, the high temperature and high pressure generated by the injection molding material inevitably damage the stator coils, and in severe cases, can even cause them to break, resulting in a high motor defect rate and low injection molding production efficiency.

[0003] Chinese Patent No. CN108574363A discloses a plastic-cased motor. While this prior art motor utilizes a plastic casing for assembly, preventing coil damage caused by injection molding, its stator assembly is loosely fitted to the inner sidewalls of the two plastic casings. This relies entirely on tooling to ensure the concentricity of the motor's two bearing chambers and bearings. This not only complicates the production process but also makes concentricity difficult to guarantee. Furthermore, during operation, the stator and rotor of this prior art motor are contained within the same cavity, preventing effective heat dissipation. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a motor with simple process, high concentricity and good versatility.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a motor, including a first shell, a second shell, a stator assembly, a rotor, a motor shaft and bearings, the first shell and the second shell are respectively provided with bearing chambers for installing bearings, the motor shaft is passed through the shaft hole of the rotor, and both ends are installed in the bearing chambers through bearings, the rotor is arranged at the center of the stator assembly, and the stator assembly includes a stator core and a stator winding; the first shell and the second shell are both made of plastic; a stator support for supporting the lower end face of the stator core is provided at the bottom of the inner cavity of the first shell, and the inner wall of the first shell is tightly matched with the outer peripheral wall of the stator core; the lower end of the second shell is inserted into the inner cavity of the first shell and pressed against the upper end face of the stator core, and the lower end outer wall of the second shell is tightly matched with the upper end inner wall of the first shell.

[0006] The above technical solution provides a motor, in which the stator assembly can be fixedly installed in the inner cavity of the first shell by supporting the stator support provided on the first shell and pressing down the lower end of the second shell, which has a simple process and high production efficiency; at the same time, the inner wall of the first shell is tightly matched with the outer peripheral wall of the stator core, which can prevent the stator assembly from shaking laterally, so that the concentricity of the various components of the motor is higher; in addition, the stator core is pressed by the lower end of the second shell to achieve the fixation of the stator assembly, without limiting the thickness of the stator core, which facilitates the use of stator cores of different thicknesses in the motor and has better versatility.

[0007] In a preferred technical solution, a first groove connected to the stator support is provided on the inner wall of the first shell in the vertical direction; a second groove is provided on the outer wall of the second shell in the vertical direction, and a notch connected to the second groove is provided on the side wall of the stator core pressed against the lower end of the second shell.

[0008] In this technology, the first groove is used to form a cold air channel for air intake, and the second groove and the notch are used to form a hot air channel for air outlet, so as to realize air convection inside the motor housing, form a heat dissipation duct structure, realize effective heat dissipation of the motor, and help extend the service life of the motor.

[0009] In a preferred technical solution, multiple first grooves are evenly arranged on the inner wall of the first shell along the circumferential direction, and multiple second grooves are evenly arranged on the lower end outer wall of the second shell along the circumferential direction; the first grooves and the second grooves are staggered, and adjacent first grooves and second grooves are not on the same plane.

[0010] In this technology, the heat dissipation effect of the motor housing is further improved by evenly arranging multiple first grooves and multiple second grooves.

[0011] In a preferred technical solution, a fully or partially tight fit relationship is formed between the inner wall of the first shell and the outer peripheral wall of the stator core, so that the stator core is not easy to loosen, ensuring the concentricity of the stator assembly and the first shell.

[0012] In a preferred technical solution, a fully tight fit or partially tight fit relationship is formed between the lower end outer wall of the second shell and the upper end inner wall of the first shell, so that the second shell is assembled more firmly and the fitting accuracy is high, which can ensure the concentricity of the second shell and the first shell.

[0013] In a preferred technical solution, the first shell and the second shell are respectively provided with mounting ears, and the first shell is connected to the second shell via the mounting ears. In this technology, the first shell and the second shell are mechanically connected together via the mounting ears, and the assembly is more secure.

[0014] In a preferred technical solution, the first shell and the second shell are fixedly connected by glue, and the glue connection is easy to operate and has low manufacturing cost.

[0015] In a preferred technical solution, fan blades are further provided on the motor shaft to achieve better heat dissipation effect.

[0016] In a preferred technical solution, the bearing chamber is made of metal or plastic. Among them, the metal bearing chamber is more durable and convenient for installing the bearing, while the plastic bearing chamber can be integrally formed with the first shell and the second shell, which is more convenient to manufacture.

[0017] In a preferred technical solution, both the first shell and the second shell are made of BMC material, which has good insulation, stable structure, low cost, and is suitable for mass production.

[0018] It can be seen from the above technical solution that compared with the prior art, the beneficial effects of the present invention are:

[0019] A motor, wherein a stator support provided on a first housing lifts up and a lower end of a second housing presses down, so that a stator assembly can be fixedly installed in an inner cavity of the first housing, with a simple process and high production efficiency;

[0020] At the same time, the inner wall of the first housing is tightly fitted with the outer peripheral wall of the stator core, which can prevent the stator assembly from swaying sideways and make the concentricity of the motor components higher;

[0021] In addition, the stator core is pressed by the lower end of the second shell to fix the stator assembly, without limiting the thickness of the stator core, making it easier to use stator cores of different thicknesses in the motor, and improving versatility.

[0022] In addition, other advantages of the present invention will be given in the following description, and some will become apparent from the following description or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 Schematic cross-section of a motor in an embodiment of the present invention;

[0025] Figure 2 This is an exploded view of the motor in the present utility model;

[0026] Figure 3 This is a schematic structural diagram of the first housing in an embodiment of the present utility model;

[0027] Figure 4A perspective view of a motor in an embodiment of the present utility model;

[0028] Explanation of the accompanying drawings: 1. First shell; 2. Second shell; 3. Stator assembly; 4. Rotor; 5. Motor shaft; 6. Bearing; 7. Bearing chamber; 8. Stator support; 9. Mounting ear; 31. Stator core; 32. Stator winding; 61. First bearing; 62. Second bearing; 71. First bearing chamber; 72. Second bearing chamber; 101. First groove; 201. Second groove; 202. Notch. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] Reference Figure 1-4 A motor according to an embodiment of the present invention is described.

[0032] In one embodiment, if Figure 1-4 As shown, a motor includes a first shell 1, a second shell 2, a stator assembly 3, a rotor 4, a motor shaft 5 and a bearing 6. The first shell 1 and the second shell 2 are respectively provided with a bearing chamber 7 for installing the bearing 6. The motor shaft 5 is passed through the axial hole of the rotor 4, and both ends are installed in the bearing chamber 7 through bearings 6. The rotor 4 is arranged at the center of the stator assembly 3. The stator assembly 3 includes a stator core 31 and a stator winding 32.

[0033] Among them, the outer shell of the above-mentioned motor is composed of a first shell 1 and a second shell 2, and the first shell 1 and the second shell 2 are fixedly connected together; a first bearing chamber 71 is provided at the center of the first shell 1, and a second bearing chamber 72 is provided at the center of the second shell 2; the center line of the first bearing chamber 71 coincides with the center line of the inner cavity of the first shell 1, and the center line of the second bearing chamber 72 coincides with the center line of the inner cavity of the second shell 2, and the center line of the first bearing chamber 71 is coaxial with the center line of the second bearing chamber 72; a first bearing 61 and a second bearing 62 are respectively provided in the first bearing chamber 71 and the second bearing chamber 72, and the first bearing 61 and the second bearing 62 are respectively sleeved on both ends of the motor shaft 5, so that the motor shaft 5 can be rotatably arranged between the first shell 1 and the second shell 2, thereby ensuring the concentricity of the stator assembly 3, the rotor 4 and the motor shaft 5.

[0034] Both the first shell 1 and the second shell 2 are made of plastic; a stator support 8 is provided at the bottom of the inner cavity of the first shell 1 for supporting the lower end surface of the stator core 31, and the inner wall of the first shell 1 is tightly matched with the outer peripheral wall of the stator core 31; the lower end of the second shell 2 is inserted into the inner cavity of the first shell 1 and pressed against the upper end surface of the stator core 31, and the lower end outer wall of the second shell 2 is tightly matched with the upper end inner wall of the first shell 1.

[0035] The stator core 31 is formed by stacking a large number of silicon steel sheets by pressure and adhesive, and the stator winding 32 is wound on the stator core 31 .

[0036] The first housing 1 can be a cylindrical housing with an open upper end, whose inner cavity constitutes an installation cavity for installing the stator assembly 3. The stator assembly 3 is arranged in the inner cavity of the first housing 1. The inner diameter of the stator support 8 is smaller than the outer diameter of the stator core 31 so as to support the lower end surface of the stator core 31 and prevent the stator core 31 from moving downward. At the same time, since the inner wall of the first housing 1 is tightly matched with the outer wall of the stator core 31, the stator core 31 can be prevented from moving left and right, ensuring that the center line of the stator assembly 3 is coaxial with the center line of the first bearing chamber 71 on the first housing 1, thereby obtaining better concentricity.

[0037] The inner diameter of the lower end of the second shell 2 is smaller than the outer diameter of the stator core 31, and the height of the second shell 2 is greater than or equal to the distance from the upper end surface of the stator core 31 to the top surface of the first shell 1. This ensures that after the second shell 2 is inserted into the inner cavity of the first shell 1, its lower end can press the upper end surface of the stator core 31, thereby preventing the stator assembly 3 from moving upward. At the same time, the outer wall of the lower end of the second shell 2 and the inner wall of the upper end of the first shell 1 form a tight fit structure, which can serve as a guide and facilitate the pressing of the second shell 2 into the inner cavity of the first shell 1.

[0038] At the same time, since the structure of the motor is to fix the stator assembly 3 by pressing the silicon steel sheets of the stator core 31 at the lower end of the second shell 2, there is no limit on the thickness of the stator core 31. Therefore, the stator core 31 can be of different thicknesses, which is more versatile.

[0039] In specific implementation, if there are other models of motors and silicon steel sheets need to be added to the stator core 31, the second shell 2 can be used with different motors while ensuring that the second shell 2 extends into the inner cavity of the first shell 1 to a certain depth, can press the upper end surface of the stator core 31, and ensures that the various components of the motor are coaxial, thereby achieving multiple uses with one mold.

[0040] The motor provided in the above embodiment can fix the stator assembly 3 in the inner cavity of the first shell 1 by supporting the stator support 8 provided on the first shell 1 and pressing down the lower end of the second shell 2. At the same time, the inner wall of the first shell 1 is tightly matched with the outer peripheral wall of the stator core 31, which can prevent the stator assembly 3 from shaking laterally, thereby improving the concentricity between the various components of the motor.

[0041] In this embodiment, a first groove 101 communicating with the stator support 8 is provided on the inner wall of the first shell 1 in the vertical direction; a second groove 201 is provided on the outer wall of the second shell 2 in the vertical direction, and a notch 202 communicating with the second groove 201 is provided on the side wall of the lower end of the second shell 2 that presses the stator core 31.

[0042] Among them, a groove extending downward from the top edge is provided on the inner wall of the first shell 1, and a groove is also provided on the top of the stator support 8. The two grooves are connected to form a first groove 101. The upper end opening of the first groove 101 is located at the top edge of the first shell 1, and the lower end opening is located on the side of the stator support 8 and contacts the lower end surface of the stator core 31, so that a cold air channel can be formed on the outside of the stator assembly 3, and the cold air channel leads to the bottom surface of the stator core 31.

[0043] The upper opening of the second groove 201 is located at the top edge of the second shell 2, and the lower opening is connected to the notch 202 and contacts the upper end surface of the stator core 31. The second groove 201 and the notch 202 are connected to each other to form a hot air channel.

[0044] During specific implementation, the number of the first groove 101 and the second groove 201 is not limited and can be one or more; a sealed cavity is formed between the inner wall of the second shell 2 and the upper end surface of the stator core 31, which encloses the main heat source of the motor - the enameled wire in the stator winding 32. After the enameled wire is heated, the air density in the sealed cavity becomes smaller, forming a negative pressure, and cold air is sucked in through the cold air channel formed by the first groove 101. At the same time, the hot air generated when the motor is working is discharged through the hot air channel formed by the second groove 201 and the notch 202, forming air convection inside the motor, forming a heat dissipation duct structure with good heat dissipation performance.

[0045] In this embodiment, a plurality of first grooves 101 are evenly arranged along the circumferential direction on the inner wall of the first shell 1, and a plurality of second grooves 201 are evenly arranged along the circumferential direction on the lower end outer wall of the second shell 2; the first grooves 101 and the second grooves 201 are staggered, and adjacent first grooves 101 and second grooves 201 are not on the same plane.

[0046] In specific implementation, in order to ensure the heat dissipation effect and the force balance of the motor, the first groove 101 and the second groove 201 can be two or more, and multiple first grooves 101 can be evenly distributed along the circumference on the inner wall of the first shell 1, and multiple second grooves 201 can be evenly distributed along the circumference on the outer wall of the second shell 2.

[0047] In this embodiment, a fully tight fit or a partially tight fit is formed between the inner wall of the first housing 1 and the outer peripheral wall of the stator core 31 .

[0048] During specific implementation, the inner wall of the first shell 1 and the outer peripheral wall of the stator core 31 are squeezed against each other to form a full or partial tight fit, so that the stator core 31 is not easy to loosen. At the same time, the fit accuracy is high, which can ensure the concentricity of the stator assembly 3 and the first shell 1.

[0049] In this embodiment, a full tight fit or a partial tight fit is formed between the lower end outer wall of the second shell 2 and the upper end inner wall of the first shell 1 .

[0050] During specific implementation, the lower outer wall of the second shell 2 and the upper inner wall of the first shell 1 are squeezed against each other to form a full or partial tight fit, so that the second shell 2 is assembled more firmly and the fit accuracy is high, which can ensure the concentricity of the second shell 2 and the first shell 1.

[0051] In this embodiment, mounting ears 9 are respectively provided on the first shell 1 and the second shell 2 , and the first shell 1 is connected to the second shell 2 via the mounting ears 9 .

[0052] Among them, the mounting ears 9 are respectively arranged on the edges of the first shell 1 and the second shell 2, and the mounting ears 9 of the two can be fixedly connected by screws and threaded rods, so that the first shell 1 and the second shell 2 are fixedly connected together to form the outer shell of the motor.

[0053] In this embodiment, the first shell 1 and the second shell 2 are fixedly connected by glue. The glue connection is easy to operate and has low manufacturing cost.

[0054] In this embodiment, fan blades are further provided on the motor shaft 5. In specific implementation, the fan blades can be provided on the upper side or the lower side of the rotor 4, so that the negative pressure in the air duct is stronger, which helps to improve the heat dissipation effect.

[0055] In this embodiment, the bearing chamber 7 is made of metal or plastic.

[0056] The bearing chamber 7 includes a first bearing chamber 71 located at the center of the first housing 1 and a second bearing chamber 72 located at the center of the second housing 2 . Both the first bearing chamber 71 and the second bearing chamber 72 are made of metal or plastic.

[0057] In specific implementation, the bearing chamber 7 made of metal is more durable and is conducive to the installation of bearings, while the bearing chamber 7 made of plastic can be integrally formed with the first shell 1 and the second shell 2, which is more convenient to manufacture.

[0058] In this embodiment, both the first shell 1 and the second shell 2 are made of BMC material.

[0059] Among them, BMC (Bulk Molding Compound) refers to bulk molding compound, which is a material used to manufacture glass fiber reinforced thermosetting products. It has excellent electrical properties, mechanical properties, heat resistance and chemical corrosion resistance. It is used to manufacture the first shell 1 and the second shell 2. It has good insulation, stable structure, low cost, and is suitable for mass production.

[0060] Other structures and operations of the motor according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0061] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0062] In the description of this specification, the reference terms "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.

[0063] 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 can be combined with each other in any suitable manner in any one or more embodiments or examples without interference or contradiction.

[0064] Materials or features may be combined with each other in any suitable manner in any one or more embodiments or examples without interference or inconsistency.

Claims

1. A motor, comprising a first housing (1), a second housing (2), a stator assembly (3), a rotor (4), a motor shaft (5) and a bearing (6), wherein the first housing (1) and the second housing (2) are respectively provided with a bearing chamber (7) for mounting the bearing (6), the motor shaft (5) is passed through an axial hole of the rotor (4), and both ends are mounted in the bearing chamber (7) through the bearing (6), the rotor (4) is arranged at the center of the stator assembly (3), and the stator assembly (3) includes a stator core (31) and a stator winding (32), characterized in that: The first shell (1) and the second shell (2) are both made of plastic; A stator support (8) for supporting the lower end surface of the stator core (31) is provided at the bottom of the inner cavity of the first shell (1), and the inner wall of the first shell (1) is tightly matched with the outer peripheral wall of the stator core (31); The lower end of the second shell (2) is inserted into the inner cavity of the first shell (1) and pressed against the upper end surface of the stator core (31), and the lower end outer wall of the second shell (2) is tightly matched with the upper end inner wall of the first shell (1).

2. The motor according to claim 1, characterized in that: A first groove (101) communicating with the stator support (8) is provided on the inner wall of the first housing (1) in a vertical direction; A second groove (201) is provided on the outer wall of the second shell (2) in the vertical direction, and a notch (202) communicating with the second groove (201) is provided on the side wall of the lower end of the second shell (2) pressing against the stator core (31).

3. The motor according to claim 2, characterized in that: A plurality of the first grooves (101) are uniformly arranged on the inner wall of the first shell (1) along the circumferential direction, and a plurality of the second grooves (201) are uniformly arranged on the outer wall of the lower end of the second shell (2) along the circumferential direction; The first grooves (101) and the second grooves (201) are arranged alternately, and adjacent first grooves (101) and second grooves (201) are not on the same plane.

4. The motor according to claim 2, characterized in that: A fully tight fit or a partially tight fit relationship is formed between the inner wall of the first housing (1) and the outer peripheral wall of the stator core (31).

5. The motor according to claim 4, characterized in that: A full tight fit or a partial tight fit relationship is formed between the lower end outer wall of the second shell (2) and the upper end inner wall of the first shell (1).

6. The motor according to claim 2, characterized in that: The first shell (1) and the second shell (2) are respectively provided with mounting ears (9), and the first shell (1) is connected to the second shell (2) via the mounting ears (9).

7. The motor according to claim 2, characterized in that: The first shell (1) and the second shell (2) are fixedly connected by glue.

8. The motor according to any one of claims 2 to 7, characterized in that: The motor shaft (5) is also provided with fan blades.

9. The motor according to claim 2, characterized in that: The bearing chamber (7) is made of metal or plastic.

10. The motor according to claim 2, characterized in that: The first shell (1) and the second shell (2) are both made of BMC material.

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