Micromotor

Abstract

The embodiment of the utility model discloses a micromotor, which relates to the technical field of motors and comprises a shell, a stator assembly and a fastening assembly. The fastening assembly is respectively connected with the shell and the stator assembly; the stator assembly comprises a stator yoke and a plurality of stator teeth arranged on the stator yoke, two adjacent stator teeth enclose to form a first winding groove or a second winding groove, the arc length of the first winding groove is greater than that of the second winding groove, and the number of the first winding groove is at least one; the shell is provided with a connecting part, and the connecting part penetrates through the first winding groove. The structure is compact, the gear module can be arranged right above the stator assembly, and the effect of reducing the size of the motor is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a micro motor. Background Art

[0002] Currently, there are two types of stator assembly structures used in micromotors: the first type uses evenly distributed slots on the stator core. This structural approach leaves no extra space for the gear module's first-stage gear driven wheel positioning shaft to set the installation position, resulting in a large module assembly. The other type uses only half of the stator core's slots, with the remaining structure made into a special structure, reserved for the gear module's first-stage gear driven wheel positioning shaft to set the installation position. This structural approach results in weak motor performance and low efficiency. Utility Model Content

[0003] The technical problem to be solved by the embodiments of the present invention is that the micro motor needs to reserve space for the gear module, resulting in a large volume.

[0004] In order to solve the above problems, the present invention discloses a micro motor with a compact structure. The gear module can be installed directly above the stator assembly, thereby reducing the size of the motor.

[0005] The utility model provides a micromotor, which includes a housing, a stator assembly and a fastening assembly; the fastening assembly is respectively connected to the housing and the stator assembly; the stator assembly includes a stator yoke and a plurality of stator teeth provided on the stator yoke, and two adjacent stator teeth enclose a first winding slot or a second winding slot, the arc length of the first winding slot is greater than the arc length of the second winding slot, and there is at least one first winding slot; the housing is provided with a connecting portion, and the connecting portion passes through the first winding slot.

[0006] A further technical solution is that the fastening assembly includes an upper fastener and a lower fastener, and the stator assembly is connected to the upper fastener and the lower fastener respectively.

[0007] A further technical solution is that the upper fastener is provided with a fastening hole, the housing is provided with a positioning column, and the positioning column passes through the fastening hole.

[0008] A further technical solution is that the upper fastener is provided with a plurality of first protrusions, and the first protrusions are embedded in the first winding grooves, or the first protrusions are embedded in the second winding grooves.

[0009] A further technical solution is that the lower fastener is provided with a plurality of second protrusions, and the second protrusions are embedded in the first winding groove, or the second protrusions are embedded in the second winding groove.

[0010] A further technical solution is that the outer diameter of the lower fastener is smaller than the outer diameter of the stator yoke.

[0011] A further technical solution is that it also includes a rotor assembly, which is connected to the housing, and the stator assembly surrounds the rotor assembly.

[0012] A further technical solution is that it also includes a first transmission gear and a second transmission gear, the first transmission gear is arranged on the rotor assembly, the first transmission gear is meshed with the second transmission gear, and the second transmission gear is arranged on the connecting portion.

[0013] A further technical solution is that a limiting groove is further provided on the stator yoke, and a limiting column is provided on the housing, and the limiting column is embedded in the limiting groove.

[0014] A further technical solution is that a plurality of support columns are provided on the shell, and all of the support columns are below the fastening assembly.

[0015] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:

[0016] The connecting portion passes through the first winding slot, so that the gear module can be directly installed above the stator assembly. The structure is simple, the assembly production efficiency is high, the structure is compact, and the size of the motor is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of a micro motor provided by an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of another micromotor structure provided by an embodiment of the present utility model;

[0020] Figure 3 A schematic diagram of another micromotor structure provided by an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of another micromotor structure provided by an embodiment of the present utility model.

[0022] Reference numerals

[0023] Housing 1, stator assembly 2, fastening assembly 3, stator yoke 21, stator teeth 22, first winding groove 23, second winding groove 24, connecting part 11, upper fastener 31, lower fastener 32, fastening hole 311, positioning column 12, first protrusion 312, second protrusion 321, rotor assembly 4, first transmission gear 51, second transmission gear 52, limiting groove 211, support column 13. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0026] It should also be understood that the terms used in this specification of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the specification of the embodiments of the present invention and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0027] See also Figure 1-4 The embodiment of the present utility model provides a micro motor. The micro motor includes a housing 1, a stator assembly 2 and a fastening assembly 3; the fastening assembly 3 is connected to the housing 1 and the stator assembly 2 respectively; the stator assembly 2 includes a stator yoke 21 and a plurality of stator teeth 22 provided on the stator yoke 21, and two adjacent stator teeth 22 enclose a first winding slot 23 or a second winding slot 24, the arc length of the first winding slot 23 is greater than the arc length of the second winding slot 24, and there is at least one first winding slot 23; the housing 1 is provided with a connecting portion 11, and the connecting portion 11 passes through the first winding slot 23. The specific description of each component is as follows:

[0028] In this embodiment, the fastening assembly 3 is used to fix the stator assembly 2 on the housing 1. The stator assembly 2 is composed of a stacked riveted iron core. The stator yoke 21 refers to the annular structure of the iron core. The stator teeth 22 are installed on the inner wall of the stator yoke 21. The arc length of the first winding groove 23 is greater than the arc length of the second winding groove 24. For example, the number of stator teeth 22 is 6, and the angles between two adjacent stator teeth 22 are 70°, 58°, 58°, 58°, 58°, and 58°, respectively. Among them, the winding groove formed by the 70° angle is the first winding groove 23, and the winding groove formed by the 58° angle is the second winding groove 24. The connecting portion 11 is a columnar structure installed on the housing 1, and the connecting portion 11 is used to install the driven wheel positioning shaft.

[0029] The technical effects that this micromotor can achieve are as follows:

[0030] The connecting portion 11 passes through the first winding slot 23, so that the gear module can be directly installed above the stator assembly 2. The structure is simple, the assembly production efficiency is high, the structure is compact, and the size of the motor is reduced.

[0031] Continue to see Figure 1-4 In this embodiment, the fastening assembly 3 includes an upper fastener 31 and a lower fastener 32 , and the stator assembly 2 is connected to the upper fastener 31 and the lower fastener 32 respectively.

[0032] Specifically, the upper fastener 31 is installed above the stator assembly 2, and the lower fastener 32 is installed below the stator assembly 2. The fastening assembly 3 has an irregular geometric shape, and is equipped with a structure that cooperates with the shell 1 to achieve a detachable connection between the fastening assembly 3 and the shell 1. In some other embodiments, the stator assembly 2 and the fastening assembly 3 can be injection molded into one piece.

[0033] Furthermore, the upper fastener 31 is provided with a fastening hole 311 , and the housing 1 is provided with a positioning column 12 , and the positioning column 12 passes through the fastening hole 311 .

[0034] Specifically, a plurality of fastening holes 311 are provided around the upper fastener 31 , and positioning posts 12 corresponding to the fastening holes 311 are installed on the housing 1 . The positioning posts 12 pass through the fastening holes 311 to achieve a firm connection between the upper fastener 31 and the housing 1 .

[0035] Furthermore, the upper fastener 31 is provided with a plurality of first protrusions 312 , and the first protrusions 312 are embedded in the first winding grooves 23 , or the first protrusions 312 are embedded in the second winding grooves 24 .

[0036] Specifically, a plurality of first protrusions 312 are installed at the bottom of the upper fastener 31, and the shape of the first protrusion 312 matches the first winding groove 23, or the shape of the first protrusion 312 matches the second winding groove 24. Each first protrusion 312 is embedded in the first winding groove 23 or the second winding groove 24, thereby achieving a firm connection between the upper fastener 31 and the stator assembly 2.

[0037] Furthermore, the lower fastener 32 is provided with a plurality of second protrusions 321 , and the second protrusions 321 are embedded in the first winding groove 23 , or the second protrusions 321 are embedded in the second winding groove 24 .

[0038] Specifically, a plurality of second protrusions 321 are installed on the top of the lower fastener 32, and the shape of the second protrusion 321 matches the first winding groove 23, or the shape of the second protrusion 321 matches the second winding groove 24. Each second protrusion 321 is embedded in the first winding groove 23 or the second winding groove 24, thereby achieving a firm connection between the lower fastener 32 and the stator assembly 2.

[0039] Furthermore, the outer diameter of the lower fastener 32 is smaller than the outer diameter of the stator yoke 21 .

[0040] Specifically, the outer shell 1 is provided with a groove body, the inner diameter of the groove body is equal to the outer diameter of the stator yoke 21. In one embodiment, a limiting groove 211 is provided on the outer wall of the stator yoke 21, and the groove body is provided with a limiting column corresponding to the limiting groove 211, so that the stator yoke 21 is fixedly connected to the outer shell 1. The outer diameter of the lower fastener 32 is smaller than the outer diameter of the stator yoke 21, and the groove corresponding to the limiting column can be omitted, thereby saving material costs.

[0041] Furthermore, a rotor assembly 4 is included. The rotor assembly 4 is connected to the housing 1 , and the stator assembly 2 surrounds the rotor assembly 4 .

[0042] Specifically, the rotor assembly 4 includes a permanent magnet and a shaft. The shaft is mounted on the outer shell 1 and distributed at the center of the stator assembly 2. The permanent magnet is connected to the shaft. According to the law of electromagnetic induction, the stator assembly 2 is energized to form a magnetic field and generate torque on the permanent magnet, so that the permanent magnet drives the shaft to rotate. It should be noted that the law of electromagnetic induction and the principle of the motor can be determined by referring to existing data, and the present invention does not make specific limitations on this.

[0043] Furthermore, it includes a first transmission gear 51 and a second transmission gear 52 . The first transmission gear 51 is provided on the rotor assembly 4 . The first transmission gear 51 is meshed with the second transmission gear 52 . The second transmission gear 52 is provided on the connecting portion 11 .

[0044] Specifically, a positioning shaft is installed on the connecting portion 11, the second transmission gear 52 is sleeved on the positioning shaft, the first transmission gear 51 and the second transmission gear 52 are meshed to form a gear module, so that the gear module is installed above the rotor assembly 4, and the structure is more compact.

[0045] Furthermore, a limiting groove 211 is provided on the stator yoke 21 , and a limiting column is provided on the housing 1 , and the limiting column is embedded in the limiting groove 211 .

[0046] Specifically, a limiting groove 211 is provided on the outer wall of the stator yoke 21 , and the groove body is provided with a limiting column corresponding to the limiting groove 211 , so as to achieve a fixed connection between the stator yoke 21 and the housing 1 .

[0047] Furthermore, a plurality of support columns 13 are provided on the housing 1 , and all of the support columns 13 are located below the fastening assembly 3 .

[0048] Specifically, the height of the fastening assembly 3 can be increased by the support column 13, so that a gap is reserved between the bottom of the fastening assembly 3 and the housing 1, which is convenient for arranging circuits and heat dissipation.

[0049] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0052] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0054] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring 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. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0055] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, as long as these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

[0056] The above description is a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A micromotor, characterized in that: including a housing, a stator assembly, and a fastening assembly; The fastening assembly is respectively connected to the housing and the stator assembly; The stator assembly includes a stator yoke and a plurality of stator teeth provided on the stator yoke, wherein two adjacent stator teeth enclose a first winding slot or a second winding slot, the arc length of the first winding slot is greater than the arc length of the second winding slot, and there is at least one first winding slot; The housing is provided with a connecting portion, and the connecting portion passes through the first winding groove.

2. The micromotor according to claim 1, characterized in that: The fastening assembly includes an upper fastener and a lower fastener, and the stator assembly is connected to the upper fastener and the lower fastener respectively.

3. The micromotor according to claim 2, characterized in that: The upper fastener is provided with a fastening hole, and the housing is provided with a positioning column, and the positioning column passes through the fastening hole.

4. The micromotor according to claim 3, characterized in that: The upper fastener is provided with a plurality of first protrusions, and the first protrusions are embedded in the first winding grooves, or the first protrusions are embedded in the second winding grooves.

5. The micromotor according to claim 2, characterized in that: The lower fastener is provided with a plurality of second protrusions, and the second protrusions are embedded in the first winding grooves, or the second protrusions are embedded in the second winding grooves.

6. The micromotor according to claim 5, characterized in that: An outer diameter of the lower fastener is smaller than an outer diameter of the stator yoke.

7. The micromotor according to claim 1, characterized in that: The invention also includes a rotor assembly, wherein the rotor assembly is connected to the housing, and the stator assembly surrounds the rotor assembly.

8. The micromotor according to claim 7, characterized in that: It also includes a first transmission gear and a second transmission gear, the first transmission gear is arranged on the rotor assembly, the first transmission gear is meshed with the second transmission gear, and the second transmission gear is arranged on the connecting portion.

9. The micromotor according to claim 1, characterized in that: The stator yoke is further provided with a limiting groove, and the housing is provided with a limiting column, and the limiting column is embedded in the limiting groove.

10. The micromotor according to claim 1, characterized in that: The shell is also provided with a plurality of support columns, and all of the support columns are below the fastening assembly.

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