CN221080998U - Miniaturized direct current brush motor - Google Patents

Abstract

The utility model discloses a miniaturized direct-current brush motor, which comprises a motor shell, an electric brush, a rotor and a plurality of arc magnets, wherein the rotor is rotatably arranged in the motor shell; one end of the electric brush is electrically connected with a power supply circuit of the motor, and the other end of the electric brush is in contact with the rotor. The miniaturized direct current brush motor can reduce the installation space required by the magnet through arranging a plurality of magnet structures which are arranged separately in the motor shell, thereby reducing the whole volume of the motor shell.

Description

Miniaturized direct current brush motor

Technical Field

The utility model relates to motor technology, in particular to a miniaturized direct current brush motor.

Background

At present, all motors are composed of a stator and a rotor, in a direct current motor, in order to turn the rotor, the current direction needs to be changed continuously, otherwise, the rotor can only turn for half a circle, so that the direct current motor needs to change the current in the rotor, namely, the direction of an electrified conductor is changed when the direction needs to be changed, an electric brush structure is generally arranged, when the motor rotates, the electric brush is in rotating contact with the rotor of the motor, electric energy is transmitted to a coil through a commutator, and the motor continuously rotates.

However, in order to match the whole circle structure of the coil, the permanent magnets in the existing motor housing are all integrally formed whole circle structures, and the coil is connected inside the permanent magnets in a penetrating manner.

Disclosure of utility model

In order to overcome the defects in the prior art, the utility model aims to provide a miniaturized direct current brush motor, which can reduce the installation space required by a magnet through arranging a plurality of magnet structures which are separately arranged in a motor shell, thereby reducing the whole volume of the motor shell.

The utility model adopts the following technical scheme:

The miniature direct current brush motor comprises a motor shell, an electric brush, a rotor and a plurality of arc magnets, wherein the rotor is rotatably arranged in the motor shell, and the arc magnets are all arranged in the motor shell and are circumferentially distributed at intervals around the central axis of the rotor; one end of the electric brush is electrically connected with a power supply circuit of the motor, and the other end of the electric brush is in contact with the rotor.

In the present utility model, as a preferred embodiment, the thickness of the arc magnet is F, and the inner diameter of a space formed by surrounding a plurality of arc magnets is E,6<E/F <12.

In the utility model, as a preferred embodiment, the motor housing comprises a large shell and a brush fixing seat, wherein a first cavity section is arranged in the large shell, a second cavity section is arranged in the brush fixing seat, and the large shell and the brush fixing seat are connected through screws, so that the first cavity section and the second cavity section jointly form a mounting cavity, and a plurality of arc magnets, the rotor and the brushes are all mounted in the mounting cavity.

In the utility model, as a preferred embodiment, a thermal protector is arranged on a power supply circuit of the motor, and the thermal protector is used for protecting a coil; the positive electrode of the electric brush is connected with the positive electrode binding post of the power supply circuit, and the negative electrode of the electric brush is connected with the positive electrode binding post of the power supply circuit; the positive electrode wiring terminal comprises a first positive electrode wiring terminal and a second positive electrode wiring terminal which are arranged in the mounting cavity; one end of the thermal protector is abutted with the first positive electrode binding post, and the other end is abutted with the second positive electrode binding post

In the utility model, as a preferred embodiment, a first bearing is arranged on the large shell, a second bearing is arranged on the electric brush fixing seat, one end of the rotor is pivoted on the large shell through the first bearing, and the other end of the rotor is pivoted on the electric brush fixing seat through the second bearing.

In the present utility model, as a preferred embodiment, the number of the arc magnets is 2N, N being an even number.

In the present utility model, as a preferred embodiment, the 2N arc magnets are disposed at four corners of the motor housing, and the four corners of the motor housing are provided with arc segments matching the arc magnets.

Compared with the prior art, the utility model has the beneficial effects that:

The plurality of arc magnets which are arranged in a split mode are matched with the coils, the magnetic force of the magnets is strong, and the materials of the magnets are saved. And the arc magnets which are arranged in a split manner can be spliced according to the inner diameter of the line segment, so that the inner diameter of the magnet structure formed by matching a plurality of arc magnets which are arranged in a split manner is relatively smaller than that of the whole circle of structure, the installation space required by the magnets is reduced, and the whole size of the motor shell is further reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic diagram of the structure of the large shell and the magnet of the present utility model;

FIG. 4 is a schematic view showing the structure of the large shell and the magnet labeled E, F of the present utility model

Fig. 5 is a schematic view of an internal assembly structure of the brush holder of the present utility model.

In the figure: 11. a large shell; 12. a brush holder; 13. a first bearing; 14. a second bearing; 20. a rotating shaft; 30. a coil; 40. a circular arc magnet; 60. a brush; 61. an anode wiring terminal; 611. a first positive terminal; 612. a second positive terminal; 62. a negative electrode terminal; 70. a thermal protector.

Detailed Description

The utility model will be further described with reference to the drawings and the detailed description, wherein it should be noted that, on the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments. Materials and equipment used in this example are commercially available, except as specifically noted. Examples of embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless specifically stated otherwise.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be fixedly connected, or may be connected through an intermediary, or may be connected between two elements or may be an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

1-5, A miniaturized DC brush motor comprises a motor shell, a brush 60, a rotor and a plurality of arc magnets, wherein the rotor is rotatably arranged in the motor shell, the arc magnets 40 are circumferentially distributed at intervals around the central axis of the rotor, one end of the brush 60 is electrically connected with a power supply circuit of the motor, and the other end of the brush 60 is in contact with the rotor.

Based on the above structure, when the miniaturized direct current brush motor of the utility model is used, the whole circle structure of the coil 30 can be used, and a plurality of arc magnets 40 which are arranged outside the coil 30 in a surrounding way can be matched with the electromagnetic field, if the magnet adopts an integrally formed whole circle structure, the magnetic force can be limited by a forming process, and the whole circle of magnet is sleeved outside the coil 30, but only part of the magnet is an effective magnet, so that the waste of the magnet is caused, the plurality of arc magnets 40 which are arranged in a split way are matched with the coil 30 in the embodiment, the magnetic force of the magnet is strong, and the magnet material is saved.

In addition, if the permanent magnet adopts a whole circle structure, in order to match the outer diameter structure of the whole circle permanent magnet, the inner diameter of the shell of the motor should be at least larger than the outer diameter of the permanent magnet, so that the volume of the motor shell is relatively larger, and therefore, the split circular arc magnets 40 can be spliced according to the inner diameter of the line segment, and the inner diameter of the magnet structure formed by matching a plurality of split circular arc magnets 40 is relatively smaller than that of the whole circle structure, so that the installation space required by the magnet is reduced, and the whole volume of the motor shell is further reduced.

Further, referring to fig. 4, the thickness of the arc magnet 40 is F, the inner diameter of the space formed by surrounding the plurality of arc magnets 40 is E,6<E/F <12, and experiments by the inventor prove that in the numerical range, the thickness of the arc magnet 40 can save the magnet material and simultaneously can enable the magnetic force generated by the arc magnet 40 to be matched with the coil 30 for normal use. In addition, the ratio of the inner diameter of the space formed by the plurality of circular arc magnets 40 to the thickness of the circular arc magnets 40 is 6<E/F <12, so that the space required by the plurality of magnets after assembly is smaller, and the outer diameter of the motor shell is reduced.

Further, the motor housing includes a large shell 11 and a brush fixing seat 12, a first cavity section is arranged in the large shell 11, a second cavity section is arranged in the brush fixing seat 12, and the large shell 11 and the brush fixing seat 12 are connected through screws, so that the first cavity section and the second cavity section jointly form an installation cavity, and a plurality of arc magnets 40, a rotor and a brush are all installed in the installation cavity. That is, the motor housing in this embodiment is formed by assembling the large housing 11 and the brush holder 12, which is convenient for mounting the rotor, the coil 30 and the arc magnet 40, and is also convenient for repairing the internal circuit and other structures.

Further, a thermal protector 70 is provided on the power supply circuit of the motor, and the thermal protector is used for protecting the coil. The positive electrode of the brush 60 is connected with a positive electrode binding post 61 of the power supply circuit, and the negative electrode of the brush is connected with a positive electrode binding post 62 of the power supply circuit; the positive electrode wiring terminal comprises a first positive electrode wiring terminal 611 and a second positive electrode wiring terminal 612 which are installed in the installation cavity; one end of the thermal protector 70 abuts against the first positive electrode terminal, and the other end abuts against the second positive electrode terminal. So, can carry out better fixed to the thermal protector, connection stability is good.

Specifically, the large housing 11 functions to provide an installation space for the magnet and to provide a magnetic field to the stator (including the first bearing 13, the arc magnet 40).

Further, a first bearing 13 may be further disposed on the large shell 11, a second bearing 14 is disposed on the brush fixing base 12, one end of the rotor is pivoted on the large shell 11 through the first bearing 13, and the other end of the rotor is pivoted on the brush fixing base 12 through the second bearing 14. In this way, the rotation of the rotor can be more smooth by the first bearing 13 and the second bearing 14 being matched with the large shell 11 and the brush fixing seat 12.

The number of the arc magnets is 2N, and N is an even number; preferably, the number of arcuate magnets 40 is four, eight, twelve or more, and the particular number may be more practically adaptable.

Further, the four arc magnets 40 are disposed at four corners of the motor housing, and arc segments matched with the arc magnets 40 are disposed at the four corners of the motor housing, that is, the periphery of the motor housing is in an arc structure, and compared with the right-angle side, the motor housing has a relatively smaller outer diameter, and the outer diameter of the motor housing is further reduced.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (4)

1. The miniature direct current brush motor is characterized by comprising a motor shell, an electric brush, a rotor and a plurality of arc magnets, wherein the rotor is rotatably arranged in the motor shell, and the arc magnets are arranged in the motor shell and are circumferentially distributed at intervals around the central axis of the rotor; one end of the electric brush is electrically connected with a power supply circuit of the motor, and the other end of the electric brush is contacted with the rotor;

The thickness of the arc magnets is F, and the inner diameter of a space formed by surrounding a plurality of arc magnets is E,6<E/F <12;

The motor shell comprises a large shell and a brush fixing seat, a first cavity section is arranged in the large shell, a second cavity section is arranged in the brush fixing seat, and the large shell and the brush fixing seat are connected through screws, so that the first cavity section and the second cavity section jointly form an installation cavity, and a plurality of arc magnets, the rotor and the brush are all installed in the installation cavity;

The motor is characterized in that a first bearing is arranged on the large shell, a second bearing is arranged on the electric brush fixing seat, one end of the rotor is pivoted on the large shell through the first bearing, and the other end of the rotor is pivoted on the electric brush fixing seat through the second bearing.

2. A miniaturized direct current brushed motor according to claim 1, characterized in that the motor is provided with a thermal protector on the power supply circuit for protecting the coil.

3. The miniaturized dc brush motor of claim 1 wherein the number of arcuate magnets is 2N and N is an even number.

4. A miniaturized direct current brushed motor according to claim 3, wherein said 2N arcuate magnets are provided at four corners of said motor housing, said motor housing having arcuate segments matching said arcuate magnets at four corners thereof.