Stator core, stator assembly and motor for hair dryer

Abstract

The utility model discloses a stator iron core, a stator assembly and a motor for a hair dryer, the stator iron core comprises a plurality of iron core units which are connected in an arc shape, each iron core unit is provided with a stator yoke and stator teeth, and an edge rolling groove is arranged between every two adjacent stator yokes; the stator core is provided with a clamping groove and a clamping protrusion. And the stator core is integrally formed by blanking a silicon steel sheet. Therefore, compared with the existing stator core, the arc-shaped stator core has the advantages that the pre-rolling process is reduced, and the production efficiency is improved; meanwhile, the deformation at the joint of the iron core units is relatively small, so that the probability of breakage of the stator iron core is reduced; moreover, the winding mode is changed from an inner winding mode to an outer winding mode, the needle threading space of the winding needle is enlarged, the space area in the winding groove is effectively increased under the same iron core size, and the groove fullness rate of the stator coil is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of motors for hair dryers, in particular to a stator core, a stator assembly and a motor for a hair dryer. Background Art

[0002] Existing small or micro motors, such as a high-speed permanent magnet brushless DC motor, have a series of advantages such as high power density, small geometric size, fast dynamic response and high operating efficiency. They have broad application prospects in high-speed operation occasions. For example, a high-speed permanent magnet brushless motor is used in a hair dryer.

[0003] The brushless DC motor needs to wind the enameled coil on the stator core to form the stator coil. The stator coil can generate a rotating magnetic field through electromagnetic induction, thereby driving the rotor to rotate. The stator core of the existing brushless DC motor is usually designed as a cylindrical structure, and a winding bracket is set inside the stator core for winding. This stator core is usually formed in one piece and cannot be split and unfolded. The area inside the winding slot is small, the winding space area is limited, the slot fill rate of the stator coil is low, and the diameter of the enameled wire is usually selected to be thin, which makes the coil current density large and the loss large, resulting in high coil temperature rise and short motor life. Later, there was an in-line unfolded stator core structure, but it was unfolded in-line, which can solve the problem of low slot fill rate of traditional stator coils. However, this stator core structure also has some shortcomings. Specifically, when the stator core is combined and rolled (and in order to solve the problem of roundness difference), it is necessary to pre-shape the semicircle and then merge the whole circle. Such a rolling process is more troublesome; and the connection between the core units is deformed to a large extent, which may lead to breakage or poor contact;

[0004] Secondly, the existing hair dryer motor grounding structure usually has a plug-in plate on the casing, and a plug spring is inserted into the plug-in plate during assembly to achieve motor grounding; this grounding structure design is not only easy to damage the plug-in plate or the plug spring (grounding terminal), resulting in poor contact, but also has the disadvantage of low operating efficiency.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0006] In order to solve the defects and shortcomings of the above-mentioned prior art, the utility model provides a stator core, a stator assembly and a motor for a hair dryer, which reduces the pre-rolling process and improves the production efficiency compared with the existing stator core by setting an arc-shaped stator core; at the same time, the deformation at the connection of the core unit is also small, reducing the probability of stator core breakage; in addition, compared with the traditional stator core, the winding method is changed from inner winding to outer winding, and the needle threading space of the winding needle becomes larger, which effectively increases the space area in the winding slot under the same core size, and effectively improves the slot fill rate of the stator coil; and, after the stator core of the present application is rolled and injected with glue, a closed circular cavity is formed, which avoids the problem of abnormal wear of components such as bearings due to foreign matter such as dust entering the motor, thereby extending the service life of the motor and improving the safety of use.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A stator core, the stator core comprising a plurality of arc-shaped connected core units, the core units having stator yokes and stator teeth, two adjacent core units being connected to each other via their respective stator yokes, and two adjacent stator yokes being provided with rolled grooves; the stator yoke of the core unit at one end of the stator core being provided with a clamping groove, the stator yoke of the core unit at the other end of the stator core being provided with a clamping protrusion adapted to the clamping groove; and the stator core being made by punching out silicon steel sheets.

[0009] As a preferred solution, the stator core is provided with a grounding socket.

[0010] As a preferred solution, the grounding socket extends along the front-to-back direction.

[0011] As a preferred solution, the rolled groove is a strip groove, and an opening extending inward and outward from the inner side of the strip groove is provided.

[0012] As a preferred embodiment, the stator core includes 6 arc-shaped core units, namely the first core unit, the second core unit, the third core unit, the fourth core unit, the fifth core unit, and the sixth core unit, and the outer sides of the stator yokes of the first core unit, the third core unit, and the fifth core unit are provided with through grooves.

[0013] A stator assembly includes a stator core, a stator coil, and a covering bracket, wherein the stator core is arranged on the covering bracket, and the stator coil is arranged on the stator core; the stator core is formed by rolling the aforementioned stator core, and after rolling, the clamping protrusion is buckled into the clamping groove.

[0014] A motor for a hair dryer comprises a stator assembly, a rotor assembly, a shell, and a PCBA board, wherein the shell has a hollow inner cavity, the stator assembly and the rotor assembly are both installed in the hollow inner cavity, and the PCBA board is located at one end of the stator assembly; the stator assembly is one of the aforementioned stator assemblies; the grounding socket is provided with a grounding pin, and the grounding pin is electrically connected to the PCBA board.

[0015] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly reduces the pre-rolling process and improves the production efficiency by setting an arc-shaped stator core compared with the existing stator core; at the same time, the deformation at the connection of the core unit is also small, which reduces the probability of the stator core breaking; in addition, compared with the traditional stator core, the winding method will be changed from inner winding to outer winding, and the needle threading space of the winding needle will be larger, which effectively increases the space area in the winding slot under the same core size, and effectively improves the slot filling rate of the stator coil; and, after the stator core of the present application is rolled and injected with glue, a closed circular cavity is formed, which avoids the problem of abnormal wear of bearings and other components caused by foreign matter such as dust entering the motor, thereby extending the service life of the motor and improving the safety of use;

[0016] Secondly, by setting the grounding structure of the motor, the problem of low assembly efficiency, easy contact and even broken grounding terminal in the existing hair dryer motor grounding design is solved.

[0017] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the stator core in the embodiment of the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of

[0020] Figure 3 This is a front view of the stator core after being rolled into a circle in the embodiment of the utility model;

[0021] Figure 4 This is a schematic structural diagram of a stator assembly in an embodiment of the present utility model;

[0022] Figure 5 It is a structural schematic diagram of the stator assembly in the embodiment of the present utility model in the unfolded state;

[0023] Figure 6 This is a schematic diagram of the structure of a hair dryer motor in an embodiment of the utility model;

[0024] Figure 7 It is a cross-sectional schematic diagram of a hair dryer motor in an embodiment of the utility model.

[0025] Description of the accompanying drawings:

[0026] 10. stator core; 101. first core unit; 102. second core unit; 103. third core unit; 104. fourth core unit; 105. fifth core unit; 106. sixth core unit; 11. stator yoke; 12. stator teeth; 13. rolled groove; 131. strip groove; 132. opening; 14. slot; 15. protrusion; 17. grounding jack; 18. through slot; 19. grounding pin; 20. stator coil; 30. covering bracket; 40. housing; 50. PCBA board; 60. rotor assembly; 100. hair dryer motor. DETAILED DESCRIPTION

[0027] The following will provide a clear and complete description of the technical solutions in the present embodiment of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only preferred embodiments of the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific implementations and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Refer to the attached Figures 1 to 7In an embodiment of the utility model, a stator core, a stator assembly and a motor for a hair dryer are provided, wherein the stator core 10 includes a plurality of arc-shaped connected core units, the core units having a stator yoke 11 and stator teeth 12, and two adjacent core units are connected to each other through their respective stator yokes 11, and a rolled groove 13 is provided between two adjacent stator yokes 11; the stator yoke 11 of the core unit at one end of the stator core 10 is provided with a slot 14, and the stator yoke 11 of the core unit at the other end of the stator core 10 is provided with a protrusion 15 adapted to the slot 14; and the stator core 10 is made of silicon steel sheets by punching, stacking and riveting.

[0031] The stator core 10 is provided with a grounding socket 17, and the grounding socket 17 extends in the front-to-back direction; the rolled groove 13 is a strip groove 131, and the inner side of the strip groove 131 extends an opening 132 that expands inwardly. In actual application, the stator core 10 includes 6 arc-shaped connected core units, which are the first core unit 101, the second core unit 102, the third core unit 103, the fourth core unit 104, the fifth core unit 105, and the sixth core unit 106, and the outer side of the stator yoke 11 of the first core unit 101, the third core unit 103, and the fifth core unit 105 is provided with a through slot 18.

[0032] The present application also discloses a stator assembly, including a stator core 10, a stator coil 20, and a covering bracket 30. The stator core 10 is arranged on the covering bracket 30, and the stator coil 20 is arranged on the stator core 10. The stator core 10 is a stator core 10 as described above, and is formed by rolling. After rolling, the clamping protrusion 15 is buckled in the clamping groove 14. Specifically, when winding, the stator core 10 is unfolded and wound, and its unfolded state is an arc. After the winding is completed, the stator core 10 is rolled by a clamp, and the clamping protrusion 15 of the stator core 10 is buckled in its clamping groove 14. After the stator core 10 is rolled, the stator core 10 is overmolded (overmolded to form the covering bracket 30). After the injection molding is completed, the grounding pin 19 described below is inserted into the grounding socket 17, and then the PCBA board 50 described below is connected to the grounding pin 19 to achieve grounding connection. In this way, through the design of the stator core 10, the winding method of the stator coil 20 is changed from the traditional inner winding method to the outer winding method, and the needle threading space of the winding needle becomes larger, which effectively increases the space area in the winding slot under the same core size, and effectively improves the slot full rate of the stator coil 20; at the same time, due to the larger winding space, the number of turns of the enameled wire wound will be relatively more, and the adjustment space will be larger, which is convenient for adjusting the power of the motor. The wire diameter can be adjusted according to the motor power level and the reasonable current density can be matched, which can effectively reduce the temperature rise of the stator coil 20, reduce the failure rate of the product, and effectively improve the service life of the product.

[0033] Furthermore, compared with some stator cores of the prior art that adopt an in-line expansion type (such as CN217508403U), the stator core 10 of the present application reduces the pre-rolling process and improves production efficiency; at the same time, because it is connected in an arc shape, the deformation at the connection is small when the core units are rolled, which reduces the probability of stator breakage;

[0034] In addition, the stator core 10 of the present application is rolled into a circle and coated with glue to form a closed circular cavity after injection molding. Compared with some stator components with slots (such as CN216016559U), it avoids the problem of abnormal wear of bearings and other components caused by foreign matter such as dust entering the motor, thereby extending the service life of the motor and improving the safety of the motor.

[0035] The present application also discloses a motor 100 for a hair dryer, comprising a stator assembly, a rotor assembly 60, a shell 40 (casing), and a PCBA board 50. The shell 40 has a hollow inner cavity, the stator assembly and the rotor assembly 60 are both installed in the hollow inner cavity, and the PCBA board 50 is located at the rear end of the stator assembly; the stator assembly is a stator assembly as described above; the grounding jack 17 is provided with a grounding pin 19, and the grounding pin 19 is electrically connected to the PCBA board 50. In this way, compared with the existing hair dryer motor, the problem that the existing grounding design (such as CN202121328790.8) is prone to poor contact and low assembly efficiency is solved. It can be added that the grounding structure design of the existing hair dryer motor is usually: a plug is set on the shell 40, and during assembly, the motor is grounded by inserting a plug spring into the plug. This grounding structure design not only has low production efficiency, but also causes greater wear when the plug spring is inserted into the plug (or when plugging and unplugging), which can easily damage the plug of the shell 40 or cause the plug spring (grounding terminal) to break, thereby causing poor contact and easily causing damage to the motor.

[0036] It should be added that the PCBA board 50 also has a three-phase common terminal connection point, a U-phase connection point, a V-phase connection point, and a W-phase connection point, and the stator assembly has corresponding three-phase common terminal PIN needles, U-phase PIN needles, V-phase PIN needles, and W-phase PIN needles; this is the prior art and is not the focus of protection of this application, so it will not be elaborated here.

[0037] The design focus of the utility model is that it mainly reduces the pre-rolling process and improves the production efficiency by setting an arc-shaped stator core compared with the existing stator core; at the same time, the deformation of the core unit connection is also small, which reduces the probability of stator core breakage; in addition, compared with the traditional stator core, the winding method is changed from inner winding to outer winding, and the needle threading space of the winding needle is enlarged, which effectively increases the space area in the winding slot under the same core size, and effectively improves the slot filling rate of the stator coil; and, after the stator core of the present application is rolled and injected with glue, a closed circular cavity is formed, which avoids the problem of abnormal wear of bearings and other components caused by foreign matter such as dust entering the motor, thereby extending the service life of the motor and improving the safety of use;

[0038] Secondly, by setting the grounding structure of the motor, the problem of low assembly efficiency, easy contact and even broken grounding terminal in the existing hair dryer motor grounding design is solved.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A stator core, characterized in that: The stator core includes a plurality of core units connected in an arc shape, wherein the core units have stator yokes and stator teeth, and two adjacent core units are connected to each other through their respective stator yokes, and a rolled groove is arranged between two adjacent stator yokes; the stator yoke of the core unit at one end of the stator core is provided with a clamping groove, and the stator yoke of the core unit at the other end of the stator core is provided with a clamping protrusion adapted to the clamping groove; and the stator core is made by punching out silicon steel sheets.

2. A stator core according to claim 1, characterized in that: The stator core is provided with a grounding socket.

3. A stator core according to claim 2, characterized in that: The grounding socket extends along the front-to-back direction.

4. A stator core according to claim 3, characterized in that: The rolled groove is a strip-shaped groove, and an opening extending inward and outwardly expanding is extended from the inner side of the strip-shaped groove.

5. A stator core according to claim 4, characterized in that: The stator core includes six arc-shaped connected core units, namely the first core unit, the second core unit, the third core unit, the fourth core unit, the fifth core unit, and the sixth core unit. Through grooves are arranged on the outer sides of the stator yokes of the first core unit, the third core unit, and the fifth core unit.

6. A stator assembly, comprising a stator core, a stator coil, and a covering bracket, wherein the stator core is arranged on the covering bracket, and the stator coil is arranged on the stator core; characterized in that: The stator core is a stator core as described in claim 5, which is formed by rolling. After rolling, the protrusion is engaged with the groove.

7. A motor for a hair dryer, comprising a stator assembly, a rotor assembly, a housing, and a PCBA board, wherein the housing has a hollow inner cavity, the stator assembly and the rotor assembly are both installed in the hollow inner cavity, and the PCBA board is located at one end of the stator assembly; characterized in that: The stator assembly is a stator assembly as claimed in claim 6; the grounding socket is provided with a grounding pin, and the grounding pin is electrically connected to the PCBA board.

Images