Stator structure compatible with various external rotors and motor

Abstract

The utility model discloses a stator structure compatible with various external rotors, which comprises a stator iron core, an inner insert and a rotating shaft, the inner insert is fixedly arranged in the stator iron core, the middle part of the inner insert is provided with a first mounting hole in a penetrating manner, and the rotating shaft is fixedly arranged in the first mounting hole of the inner insert. According to the utility model, the adaptive inner inserts are arranged between the rotating shaft and the stator iron core, so that the rotor iron core and the rotating shaft are fixedly connected into a whole in an indirect manner, and therefore, when a new motor is manufactured, only the adaptive inner inserts need to be replaced, so that the stator structure can adapt to different outer rotors, and a new stator does not need to be manufactured independently; therefore, the universality of the stator is improved, and the manufacturing cost of the motor is reduced.

Description

Technical Field

[0001] This utility model relates to the field of external rotor motor technology, specifically to a stator structure and motor compatible with multiple external rotors. Background Technology

[0002] Motors are generally classified into internal rotor motors and external rotor motors according to the relative positions of the rotor and stator. External rotor motors have the advantages of compact structure, convenient installation and reliable operation, and therefore have received increasing attention and are being used more and more widely in various fields.

[0003] The structure of an external rotor motor mainly consists of a stator, a rotor, and a shaft. The stator includes a stator core and windings. The shaft is fixedly connected to the stator. The rotor is located outside the stator and is also connected to a housing, which is rotatably connected to both ends of the shaft. The stator is connected to an external power source. When the stator is energized, it generates a rotating magnetic field. This rotating magnetic field interacts with the permanent magnets on the rotor, driving the rotor to rotate, which in turn drives the external structure connected to the rotor to rotate.

[0004] However, for existing new external rotor motors, due to various factors such as structural dimensions and shape, the size of the shaft is adjusted according to requirements. This results in dimensional discrepancies between the existing stator core and the shaft, making the existing stator incompatible with the rotor of the new motor. To solve this compatibility problem, each new motor requires the development and design of a new stator to match the external rotor. Each motor has a fixed, dedicated structure for its rotor and stator, necessitating the creation of new stator structures during the manufacturing process of existing external rotor motors, thus increasing manufacturing costs. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a stator structure and motor that is compatible with multiple external rotors, thereby solving the problems of the lack of stator versatility and the high manufacturing cost of motors in the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A stator structure compatible with multiple external rotors includes a stator core, an inner insert, and a rotating shaft. The inner insert is fixedly installed inside the stator core, and a first mounting hole is formed through the middle of the inner insert. The rotating shaft is fixedly installed inside the first mounting hole of the inner insert.

[0008] By adopting the above structural design, a matching insert is set between the rotating shaft and the stator core, so that the stator core and the rotating shaft are indirectly fixedly connected to form an integral unit. Therefore, when manufacturing a new motor, only the matching insert needs to be replaced to adapt to different outer rotors, without the need to manufacture a new stator separately. This improves the versatility of the stator and reduces the manufacturing cost of the motor.

[0009] As a further improvement, a second mounting hole is provided through the middle of the stator core, the inner insert is installed in the second mounting hole with an interference fit, and the rotating shaft is installed in the first mounting hole with an interference fit.

[0010] The above structural design, with its interference fit between the insert and the stator core, and between the shaft and the insert, prevents loosening between the various connecting structures and improves the stability of the connection.

[0011] As a further improvement, one end of the insert is provided with a first limiting boss, and the first limiting boss abuts against the stator core; the rotating shaft is provided with a second limiting boss, and the second limiting boss abuts against the insert.

[0012] The above structural design can improve the assembly efficiency and accuracy between components.

[0013] As a further improvement, the interference fit between the rotating shaft and the inner insert, as well as the interference fit between the inner insert and the stator core, are both within the tolerance range of 0.05mm-0.15mm.

[0014] As a further improvement, the rotating shaft has a through hole extending through it axially, and a lead hole communicating with the through hole is provided on the side of the rotating shaft. The lead hole is located on one side of the inner insert.

[0015] As a further improvement, the insert is made of aluminum.

[0016] To achieve the above objectives, this utility model also provides a technical solution:

[0017] An electric motor includes a stator structure compatible with multiple external rotors, a rotor, and an end cover. The rotor is provided with magnets and is located outside the stator core. Both ends of the rotor are fixedly connected to the end cover, and the end cover is rotatably connected to the shaft.

[0018] As a further improvement, the end cover includes a left end cover and a right end cover, which are detachably mounted on both ends of the rotor, and both the left end cover and the right end cover are rotatably connected to the rotor shaft through bearings.

[0019] As a further improvement, the rotor is provided with a mounting part that connects to an external structure and drives the external structure to rotate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This utility model sets a matching inner insert between the rotor shaft and the stator core, so that the rotor core and the rotor shaft are fixedly connected in an indirect way to form an integral unit. Therefore, when manufacturing a new motor, only the matching inner insert needs to be replaced to make the stator structure adaptable to different outer rotors. There is no need to manufacture a new stator separately, thereby improving the versatility of the stator and reducing the manufacturing cost of the motor.

[0022] 2. The inner insert of this utility model is provided with a first limiting boss, and the rotating shaft is provided with a second limiting boss. When the rotating shaft is assembled with the inner insert or the inner insert is assembled with the stator core, it can play a limiting role, thereby improving assembly efficiency and assembly accuracy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the motor of this utility model;

[0024] Figure 2 yes Figure 1 Sectional view in;

[0025] Figure 3 This is an exploded view of the stator structure of this utility model, which is compatible with multiple external rotors.

[0026] In the picture:

[0027] Stator core 1, second mounting hole 1a, inner insert 2, first mounting hole 2a, first limiting boss 2b, rotating shaft 3, second limiting boss 3a, through hole 3b, lead wire hole 3c, rotor 4, magnet 4a, mounting part 4b, end cover 5, left end cover 5a, right end cover 5b, bearing 6. Detailed Implementation

[0028] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Please see Figure 2 and Figure 3 This utility model provides a stator structure compatible with multiple external rotors, including a stator core 1, an inner insert 2, and a rotating shaft 3. The inner insert 2 is fixedly installed inside the stator core 1, and a first mounting hole 2a is formed through the center of the inner insert 2. The rotating shaft 3 is fixedly installed inside the first mounting hole 2a of the inner insert 2. In this embodiment, the stator core 1 is provided with winding coils, which is prior art and will not be described in detail here.

[0031] Specifically, a second mounting hole 1a is formed through the middle of the stator core 1. The inner insert 2 is installed in the second mounting hole 1a with an interference fit, and the rotating shaft 3 is installed in the first mounting hole 2a with an interference fit. In this embodiment, the tolerance range of the interference fit between the rotating shaft 3 and the inner insert 2, and the interference fit between the inner insert 2 and the stator core 1, is 0.05mm-0.15mm.

[0032] Furthermore, one end of the inner insert 2 is provided with a first limiting boss 2b, and the rotating shaft 3 is provided with a second limiting boss 3a. After installation, the first limiting boss 2b abuts against the stator core 1, and the second limiting boss 3a abuts against the inner insert 2. Therefore, the above structural design can play a limiting role during installation, which can improve assembly efficiency and accuracy. In this embodiment, the rotating shaft 3 is installed in the inner insert 2 from left to right, and the inner insert 2 is also installed in the stator core 1 from left to right. Therefore, the first limiting boss 2b is located at the left end of the inner insert 2, and the second limiting boss 3a is located on the left side of the inner insert 2.

[0033] Furthermore, the rotating shaft 3 has an axial through-hole 3b, and the side of the rotating shaft 3 has a lead wire hole 3c that communicates with the through-hole 3b. The lead wire hole 3c is located on one side of the inner insert 2. The through-hole 3b and the lead wire hole 3c form the lead wire channel for the motor power line. One end of the power line passes through the through-hole 3b and the lead wire hole 3c and is connected to the winding coil on the stator core 1. The other end is connected to an external power source to energize the stator winding.

[0034] In this embodiment, the inner insert 2 is made of aluminum. This utility model is only used as a preferred embodiment, but the material used for the inner insert 2 is not limited to aluminum.

[0035] Please see Figures 1 to 3 This utility model also provides an electric motor, including the stator structure that is compatible with multiple external rotors, as well as a rotor 4 and an end cover 5. The rotor 4 is provided with a magnet 4a inside. The rotor 4 is located outside the stator core 1, and both ends of the rotor 4 are fixedly connected to the end cover 5. The connection method can be screw fixing. The end cover 5 is rotatably connected to the rotating shaft 3.

[0036] Specifically, the end cover 5 includes a left end cover 5a and a right end cover 5b, which are detachably mounted on both ends of the rotor 4, and both end covers 5a and 5b are rotatably connected to the rotating shaft 3 via bearings 6. The rotor 4 is provided with a mounting part 4b that connects to an external structure and drives the external structure to rotate. Similarly, the mounting part 4b can be connected to the external structure by bolts or screws.

[0037] The motor in this embodiment is suitable for use with fans. The fan blades are fixedly connected to the mounting part 4b. The rotation of the rotor 4 drives the rotation of the fan blades. However, the motor in this utility model is not limited to use with fans.

[0038] The working principle of this utility model is as follows:

[0039] During the fabrication of the new external rotor motor, due to various factors such as the structural dimensions of the rotor 4, the dimensions of the end cover 5 and the shaft 3 change accordingly. Therefore, the existing stator core 1 cannot be directly fixed to the shaft 3, resulting in a dimensional mismatch. The most common solution to this problem is to develop a new stator lamination type to fit the rotor 4, which increases the motor manufacturing cost. In this application, a fitting insert 2 is added between the original stator core 1 and the new shaft 3. During installation, firstly, the insert 2 is fixedly installed in the second mounting hole 1a of the stator core 1 using an interference fit, until the first limiting boss 2b abuts against the stator core 1. Then, the shaft 3 is fixedly installed in the first mounting hole 2a of the insert 2, until the second limiting boss 3a abuts against the side of the insert 2. Therefore, this application designs an inner insert 2 that is compatible with the size of the second mounting hole 1a of the stator core 1 and the diameter of the shaft 3, so that the existing stator core 1 can be compatible with a variety of external rotors, thereby improving the versatility of the stator core 1 and reducing the motor manufacturing cost.

[0040] After the stator core 1, inner insert 2, and rotating shaft 3 are installed to form an integrated structure, the rotor 4 and end covers 5 are then installed. The end covers 5 are fixed to the rotor 4 with screws or bolts. The left end cover 5a and the right end cover 5b are rotatably connected to the rotating shaft 3 through bearings 6. The coil windings of the stator core 1 are connected to power lines, which lead out from the through hole 3b and lead hole 3c of the rotating shaft 3 to provide an external power source. The rotor 4 is provided with a mounting part 4b for connecting to external components, and the rotation of the rotor 4 drives the external components to rotate.

[0041] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A stator structure compatible with multiple external rotors, characterized in that, It includes a stator core (1), an inner insert (2) and a rotating shaft (3). The inner insert (2) is fixedly installed inside the stator core (1). A first mounting hole (2a) is opened through the middle of the inner insert (2). The rotating shaft (3) is fixedly installed inside the first mounting hole (2a) of the inner insert (2).

2. The stator structure compatible with multiple external rotors as described in claim 1, characterized in that, The stator core (1) has a second mounting hole (1a) through the middle, the inner insert (2) is installed in the second mounting hole (1a) with an interference fit, and the rotating shaft (3) is installed in the first mounting hole (2a) with an interference fit.

3. The stator structure compatible with multiple external rotors as described in claim 1 or 2, characterized in that, One end of the insert (2) is provided with a first limiting boss (2b), and the first limiting boss (2b) abuts against the stator core (1); the rotating shaft (3) is provided with a second limiting boss (3a), and the second limiting boss (3a) abuts against the insert (2).

4. The stator structure compatible with multiple external rotors as described in claim 2, characterized in that, The interference fit between the rotating shaft (3) and the inner insert (2) and the interference fit between the inner insert (2) and the stator core (1) are both within the tolerance range of 0.05mm-0.15mm.

5. The stator structure compatible with multiple external rotors as described in claim 1, characterized in that, The rotating shaft (3) has an axial through hole (3b) and a lead hole (3c) communicating with the through hole (3b) is provided on the side of the rotating shaft (3). The lead hole (3c) is located on one side of the inner insert (2).

6. The stator structure compatible with multiple external rotors as described in claim 1, characterized in that, The insert (2) is made of aluminum.

7. An electric motor, characterized in that, The stator structure is compatible with multiple external rotors as described in any one of claims 1-6, and includes a rotor (4) and an end cover (5). The rotor (4) is provided with a magnet (4a). The rotor (4) is located outside the stator core (1), and both ends of the rotor (4) are fixedly connected to the end cover (5). The end cover (5) is rotatably connected to the rotating shaft (3).

8. The motor as described in claim 7, characterized in that, The end cap (5) includes a left end cap (5a) and a right end cap (5b). The left end cap (5a) and the right end cap (5b) are detachably mounted on both ends of the rotor (4), and the left end cap (5a) and the right end cap (5b) are rotatably connected to the rotating shaft (3) through bearings (6).

9. The motor as described in claim 7, characterized in that, The rotor (4) is provided with a mounting part (4b) that connects to the external structure and drives the external structure to rotate.

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