CN217087092U - Novel motor carbon brush holder - Google Patents

Abstract

The utility model discloses a novel motor carbon brush frame, compare in traditional carbon brush structure, a structure is simple, design benefit, set up the guide rail through the inside four sides at the carbon brush cover, set up the conducting bar rather than corresponding all around at the carbon brush, the very big area of contact between carbon brush cover inner wall and the carbon brush that has reduced, make simultaneously and formed the heat dissipation passageway between carbon brush cover and the carbon brush, and set up a plurality of louvres on the carbon brush cover, the heat that can sparse carbon brush and commutator sliding friction produce fast, the temperature rise of having avoided the heat to constantly gathering and leading to the carbon brush is too big, the durability of carbon brush and the heat dissipation cost that has reduced the motor have been improved to a certain extent, carbon brush sleeve card dead carbon brush because of high temperature deformation has also been avoided, make unable and commutator contact, thereby form the problem of opening a way.

Description

Novel motor carbon brush holder

Technical Field

The utility model relates to a fitting of motor specifically is a novel motor carbon brush holder that relates to.

Background

Carbon brushes are sliding contacts widely used in many electrical devices, and the materials of the carbon brushes mainly include graphite, impregnated graphite, metal (copper-containing or silver-containing) graphite, and the like. In the motor, the carbon brush is mainly used for transmitting electric energy between the stator and the rotor, namely, in the process of high-speed rotation of the motor shaft, the commutator fixedly connected on the motor shaft can be in sliding contact with the carbon brush and conduct electricity, so that the stator winding and the rotor winding are electrically conducted.

When the motor is locked, the power factor of the motor is extremely low, and the locked current can reach 7 times of load current. If the rotor coil is designed to withstand the locked-rotor current, the motor coil will not burn out and the locked-rotor current will continue until the locked-rotor condition disappears. At this time, the carbon brush of the motor can emit a lot of heat, and the temperature around the carbon brush will rise, which inevitably leads to the melting deformation of the carbon brush groove. The deformed carbon brush groove can clamp the carbon brush, so that the carbon brush cannot be contacted with the commutator, an open circuit is formed, and the motor cannot rotate again even if the locked-rotor condition is solved later.

The problem can be solved by selecting a material with a higher Vicat softening point to be used as the carbon brush groove, but the cost is increased at the same time. Therefore, it is necessary to provide a new carbon brush structure of the motor in consideration of other aspects.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a novel motor carbon brush holder.

In order to achieve the above object, the utility model provides a following technical scheme:

a novel motor carbon brush holder comprises a circular ring-shaped carbon brush bottom support, wherein arc-shaped mounting platforms symmetrical to the central line of the circular ring are arranged on two sides of the carbon brush bottom support, a carbon brush sleeve is fixed on each mounting platform, a carbon brush is arranged in each carbon brush sleeve, the carbon brush is in a strip shape, one end of the carbon brush, which is far away from the center of the carbon brush bottom support, is provided with a conductive copper braid which is tightly connected with the carbon brush bottom support, the end face at the other end is an arc surface which is matched with the shape of the outer surface of the commutator of the motor and is abutted against the outer surface of the commutator of the motor, current is sent to the commutator from the conductive copper braid through the carbon brush, the middle parts of the four inner side walls of the carbon brush sleeve are respectively provided with a concave guide rail connected with the end surfaces of the two sides of the carbon brush sleeve, the concave guide rail inner concave part and the two side convex parts are both arranged into arc structures, guide strips with end parts matched with the concave guide rail inner concave part are correspondingly arranged on the periphery of the carbon brush, and the convex parts are in contact with the surface of the carbon brush; and a plurality of heat dissipation holes which are arranged in a straight line are symmetrically arranged on the four side walls of the carbon brush sleeve respectively at the two sides of the concave guide rail positioned on the side walls.

As the utility model discloses an optimal setting, the carbon brush collet with mounting platform is aluminium system structure.

As the preferred arrangement of the utility model, the carbon brush is cuboid shape.

The utility model discloses possess following beneficial effect:

the utility model discloses compare in traditional carbon brush structure, a structure is simple, design benefit, set up the guide rail through side four sides in the carbon brush cover, set up the conducting bar rather than corresponding all around at the carbon brush, very big reduction the area of contact between carbon brush cover inner wall and the carbon brush, make simultaneously and formed the heat dissipation passageway between carbon brush cover and the carbon brush, and set up a plurality of louvres on the carbon brush cover, can evacuate the heat that carbon brush and commutator sliding friction produced fast, it is too big to have avoided the heat constantly to gather and lead to the temperature rise of carbon brush, the durability of carbon brush has been improved and the heat dissipation cost of motor has been reduced to a certain extent, also avoided because of the dead carbon brush of the carbon brush cover card of high temperature deformation, make the carbon brush unable and commutator contact, thereby form the problem of opening a way.

Drawings

Fig. 1 is a schematic structural view of a novel motor carbon brush holder provided by the present invention;

fig. 2 is a schematic view of a connection structure of the carbon brush sleeve and the carbon brush provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, a novel motor carbon brush holder comprises a circular ring-shaped carbon brush bottom support 1, wherein arc-shaped mounting platforms 2 symmetrical to the central line of the circular ring are arranged on two sides of the carbon brush bottom support 1, a carbon brush sleeve 3 is fixed on the mounting platforms 2, a carbon brush 4 is arranged in the carbon brush sleeve 3, the carbon brush 4 is long-strip-shaped, specifically, the carbon brush 4 is cuboid-shaped, a carbon brush lead 5 fixedly connected with the carbon brush bottom support is arranged at one end of the carbon brush 4 far away from the center of the carbon brush bottom support 1, the carbon brush lead 5 is composed of a conductive copper braid, current is sent to a commutator from the conductive copper braid through the carbon brush, and the end face of the other end of the carbon brush is a cambered surface matched with and abutted to the outer surface shape of the commutator of a motor. Concave guide rails 6 connected with the end faces of two sides of the carbon brush sleeve 3 are respectively arranged in the middle of the four inner side walls of the carbon brush sleeve, concave parts in the concave guide rails 6 and convex parts on two sides are respectively arranged to be arc-shaped structures, guide strips 7 with end parts matched with the concave parts in the concave guide rails 6 are correspondingly arranged on the periphery of the carbon brush 4, and the convex parts are in contact with the surfaces of the carbon brush 4; and a plurality of heat dissipation holes 8 which are arranged in a straight line are symmetrically arranged on the four side walls of the carbon brush sleeve 3 at the two sides of the concave guide rail 6 positioned on the side walls respectively.

As the utility model discloses preferred setting, carbon brush collet 1 with mounting platform 2 is aluminium system structure.

The utility model discloses compare in traditional carbon brush structure, a structure is simple, design benefit, set up the guide rail through side four sides in the carbon brush cover, set up the conducting bar rather than corresponding all around at the carbon brush, very big reduction the area of contact between carbon brush cover inner wall and the carbon brush, make simultaneously and formed the heat dissipation passageway between carbon brush cover and the carbon brush, and set up a plurality of louvres on the carbon brush cover, can evacuate the heat that carbon brush and commutator sliding friction produced fast, it is too big to have avoided the heat constantly to gather and lead to the temperature rise of carbon brush, the durability of carbon brush has been improved and the heat dissipation cost of motor has been reduced to a certain extent, also avoided because of the dead carbon brush of the carbon brush cover card of high temperature deformation, make the carbon brush unable and commutator contact, thereby form the problem of opening a way.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Claims (3)

1. A novel motor carbon brush holder comprises a circular ring-shaped carbon brush bottom support, wherein arc-shaped mounting platforms symmetrical to the central line of the circular ring are arranged on two sides of the carbon brush bottom support, a carbon brush sleeve is fixed on each mounting platform, a carbon brush is arranged in each carbon brush sleeve, the carbon brush is in a strip shape, one end of the carbon brush, which is far away from the center of the carbon brush bottom support, is provided with a conductive copper braid which is tightly connected with the carbon brush bottom support, the end face at the other end is an arc surface which is matched with the shape of the outer surface of the commutator of the motor and is abutted against the outer surface of the commutator of the motor, current is sent to the commutator from the conductive copper braid through the carbon brush, it is characterized in that concave guide rails connected with the end surfaces at the two sides of the carbon brush sleeve are respectively arranged in the middle of the four inner side walls of the carbon brush sleeve, the concave guide rail inner concave part and the two side convex parts are both arranged into arc structures, guide strips with end parts matched with the concave guide rail inner concave part are correspondingly arranged on the periphery of the carbon brush, and the convex parts are in contact with the surface of the carbon brush; and a plurality of heat dissipation holes which are arranged in a straight line are symmetrically arranged on the four side walls of the carbon brush sleeve respectively at the two sides of the concave guide rail positioned on the side walls.

2. A novel carbon brush holder for an electric machine as claimed in claim 1, wherein the carbon brush holder and the mounting platform are both of aluminum construction.

3. A novel motor carbon brush holder according to claim 1, wherein said carbon brush is in the shape of a rectangular parallelepiped.

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