Low-noise sealed direct current motor

Abstract

The utility model relates to the technical field of direct-current motors, in particular to a low-noise sealed direct-current motor, which comprises a shell, a stator, an electric brush and a rotor, the stator, the electric brush and the rotor are arranged in the shell, the rotor comprises a rotor shaft, a coil, an iron core and a commutator, the stator comprises two magnetic shoes and two U-shaped iron pieces arranged between the two magnetic shoes, and the U-shaped iron pieces are arranged in the shell. The two sides of the shell are matched with the two U-shaped iron pieces in shape respectively, and the two U-shaped iron pieces abut against the two inner sides of the shell respectively. The lower end of the shell is detachably connected with a lower cover and a cover plate, a plurality of positioning columns are arranged on the lower end face of the lower cover in a protruding and extending mode, the cover plate is provided with positioning holes corresponding to the positioning columns in a one-to-one mode, the lower cover and the cover plate are matched through the positioning columns and the positioning holes, and the lower cover and the cover plate are connected in a magnetic attraction mode. According to the motor of the utility model, through the specific design of the stator and the housing, the noise of the motor can be reduced, and meanwhile, the motor has the effect of simple assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of DC motors, in particular to a low-noise sealed DC motor. Background Art

[0002] With the development of society, railway locomotives and oilfield drilling rigs have an increasing demand for the power and torque of the matching motors. In order to enable the motors to output greater power and torque, designers can only increase the wire gauge of the stator coil and increase the stator current of the motor.

[0003] However, since the space of small household appliances is generally fixed, the appearance of the supporting motor cannot be enlarged, and the space for increasing the wire gauge of the stator coil inside the motor is also very limited. When the wire gauge of the stator coil changes very little, it is still difficult to meet customers' needs for low noise and easy assembly. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a low-noise sealed DC motor, which can reduce the noise of the motor through a specific stator and housing design, and at the same time make the motor easy to assemble.

[0005] The utility model is realized by the following technical solutions:

[0006] A low-noise sealed DC motor comprises a housing, a stator, a brush and a rotor installed in the housing, the rotor comprising a rotor shaft, a coil, an iron core and a commutator, the stator comprising two magnetic tiles and two U-shaped iron pieces arranged between the two magnetic tiles, the two sides of the housing respectively conform to the shapes of the two U-shaped iron pieces and the two U-shaped iron pieces respectively abut against the two inner sides of the housing;

[0007] The lower end of the shell is detachably connected with a lower cover and a cover plate, the lower end surface of the lower cover is protruding with a plurality of positioning posts, the cover plate is provided with positioning holes corresponding to the positioning posts one by one, the lower cover and the cover plate are matched with each other through the positioning posts and the positioning holes, and the lower cover and the cover plate are magnetically connected.

[0008] The iron core is a star-shaped structure, each end of the iron core is extended with an arc portion, and the coil is wound around the end of the iron core located on the inner side of the arc portion.

[0009] Wherein, the arc-shaped portion is integrally formed with the iron core.

[0010] Wherein, the angles between the five ends of the iron core are all 72°.

[0011] Wherein, the outer sleeve of the commutator is provided with an insulating positioning ring, and the positioning ring is slidably connected with the inner wall of the shell; one end surface of the positioning ring is provided with a plurality of positioning grooves;

[0012] The side surface of the commutator is provided with a plurality of positioning pieces corresponding to the positioning grooves one by one.

[0013] There are five positioning grooves, and the angles between the five positioning grooves are all 72°.

[0014] Beneficial effects of the utility model:

[0015] A low-noise sealed DC motor, which is provided with a separate magnetic tile, a U-shaped iron stator structure and a corresponding shell structure, can increase the compactness of the stator and the shell during assembly, avoid the vibration of the stator during the operation of the motor, and improve the quietness of the motor; in addition, the positioning columns and positioning grooves between the lower cover and the cover plate, and the magnetically attracted lower cover and cover plate can realize convenient disassembly and assembly of the motor, so that the motor of the utility model has the effect of simple assembly and reduces the difficulty of maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0018] Figure 2 It is an exploded view of the utility model.

[0019] Reference numerals

[0020] Housing--100, stator--200, magnetic tile--201, U-shaped iron piece--202, rotor--300, rotor shaft--301, coil--302, iron core--303, commutator--304, arc--305, positioning ring--306, positioning groove--307, positioning piece--308, brush--309, positioning hole--310, positioning column--311, lower cover--312, cover plate--313. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0022] 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", "axial", "radial", "circumferential" and the like 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 referred device or element 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.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, five, etc., unless otherwise clearly and specifically defined.

[0024] With the development of society, railway locomotives and oilfield drilling rigs have an increasing demand for the power and torque of the matching motors. In order to enable the motors to output greater power and torque, designers can only increase the wire gauge of the stator coil and increase the stator current of the motor.

[0025] However, since the space of small household appliances is generally fixed, the appearance of the supporting motor cannot be enlarged, and the space for increasing the wire gauge of the stator coil inside the motor is also very limited. When the wire gauge of the stator coil changes very little, it is still difficult to meet customers' needs for low noise and easy assembly.

[0026] In order to solve the above problems, this embodiment discloses a low-noise sealed DC motor, whose structure is as follows: Figure 1 and Figure 2As shown, the motor includes a housing 100, a stator 200, a brush 309 and a rotor 300 installed in the housing 100, the rotor 300 includes a rotor shaft 301, a coil 302, an iron core 303 and a commutator 304, the stator 200 includes two magnetic tiles 201 and two U-shaped iron pieces 202 arranged between the two magnetic tiles 201, the two sides of the housing 100 are respectively adapted to the shapes of the two U-shaped iron pieces 202 and the two U-shaped iron pieces 203 are arranged between the two magnetic tiles 201. Parts 202 respectively abut against the two inner sides of the outer shell 100; the lower end of the outer shell 100 is detachably connected with a lower cover 312 and a cover plate 313, and the lower end surface of the lower cover 312 is protrudingly provided with a plurality of positioning posts 311, and the cover plate 313 is provided with positioning holes 310 corresponding to the positioning posts 311 one by one, and the lower cover 312 and the cover plate 313 are matched with each other through the positioning posts 311 and the positioning holes 310, and the lower cover 312 and the cover plate 313 are magnetically connected.

[0027] Preferably, in this embodiment, the iron core 303 is a star-shaped structure, and an arc portion 305 is extended from each end of the iron core 303, and the coil 302 is wound around the end of the iron core 303 and located on the inner side of the arc portion 305; the arc portion 305 and the iron core 303 are integrally formed, and the angles between the five ends of the iron core 303 are all 72° to ensure the overall structural strength of the rotor 300.

[0028] Specifically, a low-noise sealed DC motor of the utility model can increase the compactness of the stator 200 and the shell 100 during assembly by providing a separate magnetic tile 201, a U-shaped iron piece 202 stator 200 structure and a shell 100 structure corresponding thereto, thereby avoiding vibration of the stator 200 during operation of the motor and improving the quietness of the motor; in addition, the positioning column 311 and the positioning groove 307 between the lower cover 312 and the cover plate 313, and the magnetically attracted lower cover 312 and cover plate 313 can all realize convenient disassembly and assembly of the motor, so that the motor of the utility model has the effect of simple assembly and reduces the difficulty of maintenance and replacement.

[0029] Furthermore, the outer sleeve of the commutator 304 is provided with an insulating positioning ring 306, and the positioning ring 306 is slidably connected to the inner wall of the housing 100; one end face of the positioning ring 306 is provided with a plurality of positioning grooves 307; and the side of the commutator 304 is provided with a plurality of positioning members 308 corresponding to the positioning grooves 307. When the motor is stopped, the positioning members 308 are embedded in the positioning grooves 307 to realize the self-locking of the motor. When it is needed, the positioning grooves 307 are separated from the positioning members 308 by pushing the positioning members 308. Preferably, the number of the positioning grooves 307 is five, and the angles between the five positioning grooves 307 are all 72°.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A low-noise sealed DC motor, comprising a housing, a stator, a brush and a rotor installed in the housing, wherein the rotor comprises a rotor shaft, a coil, an iron core and a commutator, wherein: The stator comprises two magnetic tiles and two U-shaped iron pieces arranged between the two magnetic tiles, the two sides of the shell are respectively adapted to the shapes of the two U-shaped iron pieces, and the two U-shaped iron pieces are respectively against the two inner sides of the shell; The lower end of the shell is detachably connected with a lower cover and a cover plate, the lower end surface of the lower cover is protruding with a plurality of positioning posts, the cover plate is provided with positioning holes corresponding to the positioning posts one by one, the lower cover and the cover plate are matched with each other through the positioning posts and the positioning holes, and the lower cover and the cover plate are magnetically connected.

2. A low-noise sealed DC motor according to claim 1, characterized in that: The iron core is a star-shaped structure, and each end of the iron core is extended with an arc-shaped portion, and the coil is wound around the end of the iron core located on the inner side of the arc-shaped portion.

3. A low-noise sealed DC motor according to claim 2, characterized in that: The arc-shaped portion is integrally formed with the iron core.

4. A low-noise sealed DC motor according to claim 1, characterized in that: The included angles between the five ends of the iron core are all 72°.

5. A low-noise sealed DC motor according to claim 1, characterized in that: The outer sleeve of the commutator is provided with an insulating positioning ring, and the positioning ring is slidably connected with the inner wall of the shell; one end surface of the positioning ring is provided with a plurality of positioning grooves; The side surface of the commutator is provided with a plurality of positioning pieces corresponding to the positioning grooves one by one.

6. A low-noise sealed DC motor according to claim 5, characterized in that: The number of the positioning grooves is five, and the angles between the five positioning grooves are all 72°.

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