CN113328558A

CN113328558A - Centripetal carbon brush holder structure of motor

Info

Publication number: CN113328558A
Application number: CN202110461778.2A
Authority: CN
Inventors: 韩振善; 钟绍辉; 时兴华; 师江涛
Original assignee: Xi'an Zhongche Yongdian Jieli Wind Energy Co ltd
Current assignee: Xi'an Zhongche Yongdian Jieli Wind Energy Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2021-08-31

Abstract

The invention relates to a brush holder structure of a centripetal carbon brush of a motor, which is characterized by comprising a plurality of brush boxes, wherein the brush boxes are fixed on a brush frame, a carbon brush is inserted in each brush box, a spherical groove is formed in the upper end part of the carbon brush, a self-centering ball is arranged in each spherical groove, and a coil spring is inserted in the arc surface at the top end of each self-centering ball. According to the centripetal carbon brush holder structure of the motor, the structure can be applied to a double-fed wind power product, the lateral component force generated by a coil spring is eliminated, the voltage stabilization result is improved, the quality problems of lateral eccentric wear, poor contact and the like of the carbon brush are avoided, the quality and the service life of the motor are improved, when the radial runout quantity of the outer diameter of the slip ring is large, the contact area of the spherical structure of the self-centering ball and the slip ring is automatically adjusted along with the stress change of the carbon brush, and the ring fire caused by the fact that the carbon brush is separated from the slip ring can be avoided.

Description

Centripetal carbon brush holder structure of motor

Technical Field

The invention belongs to the technical field of motor brush holders, and particularly relates to a centripetal carbon brush holder structure of a motor.

Background

Carbon brushes are a sliding contact device for transmitting power or signals between a stationary part and a rotating part of an electric motor, generator or other rotating machine. Usually carbon brushes are fixed in the brush holder. The brush holder is fixed on the shell or the end cover. The brush holder has many forms, and can be roughly divided into 3 types: tubular, built-in and coil spring. A coil spring type brush holder is generally adopted on the doubly-fed wind generator. The brush holder structure of the coil spring structure is simple, the fixing frames of the two electric brushes and the connected coil spring frame are fixed on an insulating plate, and the insulating plate is fixed on the brush frame of the machine shell. The fixing holes in the insulating plate are generally long holes, so that the insulating plate can be moved to manually adjust the position of the carbon brush. The prior brush holder has the following defects: the pressure of a coil spring acting on a carbon brush is not a pure radial force, the diameter of the coil spring is increased along with the reduction of the abrasion of the carbon brush, namely, the pressure is changed, and a lateral component force acts on the carbon brush, so that the carbon brush and a brush holder are in contact abrasion of a single-side, the carbon brush has a certain inclination angle, and finally the result is that the carbon brush is in poor contact with a slip ring, and the ring fire is easy to occur; secondly, the carbon brush is unevenly stressed and has high abrasion speed; and thirdly, the coil spring is in contact with the sliding ring to cause damage.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a centripetal carbon brush holder structure of a motor, which eliminates lateral component force generated by a coil spring, improves the voltage stabilization result, avoids the quality problems of lateral eccentric wear, poor contact and the like of a carbon brush, improves the quality and the service life of the motor, automatically adjusts the contact area of a spherical structure of a self-centering ball with a carbon brush along with the stress change of the carbon brush when the outer diameter of the slip ring has larger radial runout, and can avoid ring fire caused by the fact that the carbon brush is separated from the slip ring.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a structure is held to motor centripetal carbon brush, its characterized in that includes a plurality of brush box, the brush box is fixed on the brush yoke, brush box interpolation has the carbon brush, carbon brush upper end position is provided with spherical groove, place in the spherical groove from centering ball, it has the coil spring to peg graft in the arc surface on centering ball top.

Further, the spherical surface of the self-centering ball faces downwards, and the spherical surface of the self-centering ball is matched with a spherical groove arranged at the upper end of the carbon brush.

Furthermore, a plurality of guide posts are vertically arranged on the inner wall of the brush box.

Furthermore, the guide post is in a convex arc structure on the inner wall of the brush box.

Furthermore, the guide post is provided with 8 altogether, and evenly distributed is provided with 2 on every inner wall on four inner walls of brush box, and the guide post that is located the opposite face is symmetrical.

Further, the clearance between the carbon brush and the brush box is uniform.

Furthermore, an alarm scale is arranged on the carbon brush.

Further, the self-centering ball is made of a non-magnetic insulating material.

Compared with the prior art, the invention has the following beneficial effects:

the structure can be applied to double-fed wind power products, lateral component force generated by a coil spring is eliminated, the voltage stabilization result is improved, the quality problems of lateral eccentric wear, poor contact and the like of the carbon brush are avoided, the quality and the service life of the motor are improved, when the radial runout quantity of the outer diameter of the slip ring is large, the spherical surface structure of the self-centering ball automatically adjusts along with the stress change of the carbon brush and always points to the circle center of the slip ring along with the stress direction of the slip ring, so that the contact area is ensured, and the phenomenon that the carbon brush breaks away from the slip ring to cause ring fire can be avoided.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is an overall structure diagram of a centripetal carbon brush holder structure of a motor according to an embodiment of the present invention;

fig. 2 is a partially enlarged view of a brush holder structure of a centripetal carbon brush of an electric machine according to an embodiment of the present invention;

fig. 3 is a top view of a centripetal carbon brush holder structure of a motor according to an embodiment of the present invention;

FIG. 4 is a side view of a self-centering ball according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a carbon brush according to an embodiment of the invention;

wherein: 1. a coil spring; 2. a self-centering ball; 3. a carbon brush; 4. a guide post; 5. a brush box; 6. a slip ring;

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.

As shown in fig. 1 to 5, an embodiment of the present invention provides a centripetal carbon brush holder structure for a motor, which is characterized in that the brush holder structure includes a plurality of brush boxes 5, the brush boxes 5 are fixed on a brush holder, a carbon brush 3 is inserted into each brush box 5, a spherical groove is disposed at an upper end portion of each carbon brush 3, a self-centering ball 2 is disposed in each spherical groove, and a disc spring 1 is inserted into a circular arc surface at a top end of each self-centering ball 2. After the self-centering ball 2 is adopted, the force borne by the carbon brush 3 is always kept in the radial centripetal direction, and no non-centripetal force acts, so that the carbon brush 3 and the slip ring 6 have surface contact to the maximum extent and are uniformly worn, the pressure of the coil spring 1 is the non-centripetal force, the direction of the force is changed through the self-centering ball 2, and the force is always transmitted to the carbon brush 3 in the radial centripetal force mode; when the radial runout quantity of the outer diameter of the slip ring 6 is large, the self-centering ball 2 is arranged, the problem of ring fire caused by the fact that a carbon brush jumps and the slip ring are separated due to runout is solved, and the self-centering ball is made of special non-magnetic insulating materials, so that eddy current is avoided.

Further, the spherical surface of the self-centering ball 2 faces downwards, and the spherical surface of the self-centering ball 2 is matched with a spherical groove arranged at the center of the top of the carbon brush 3.

Further, the vertical a plurality of guide post 4 that is provided with of inner wall of brush box 5, guide post 4 has reduced the wall thickness of brush box under the prerequisite of guaranteeing brush box rigidity, traditional handicraft is processing all contact surfaces of brush box inner wall, and this scheme brush box inner wall only processes guide post arc surface, guide post 4 rational distribution of structure has brushed the clearance between box 5 and the carbon brush 3, area of contact and friction area when having reduced the radial reciprocal high frequency motion of carbon brush, the radiating effect has been increased, material and processing cost have been reduced, carbon brush direction precision has been improved, the effective control carbon brush temperature, the carbon brush life-span has been improved.

Further, the guide post 4 is a convex arc structure on the inner wall of the brush box 5.

Furthermore, 8 guide posts 4 are arranged, and are evenly distributed on four inner walls of the

brush box

5, 2 guide posts 4 on opposite surfaces are symmetrical.

Further, the gap between the carbon brush 3 and the brush box 5 is uniform.

Further, the alarm scale is arranged on the carbon brush 3, the alarm length of the carbon brush is reduced to 5mm from 10mm by the centripetal carbon brush holder structure of the motor, the service life of the carbon brush is prolonged to be not less than 13 months from not less than 12 months, and therefore the service life of the carbon brush is prolonged by the centripetal carbon brush holder structure, and the production cost is reduced.

Further, the self-centering ball 2 is made of a non-magnetic insulating material.

The assembly process of the centripetal carbon brush holder structure comprises the following steps: firstly fixing a brush box 5 on a brush holder, inserting a carbon brush 3 into the brush box, placing a self-centering ball 2 with a downward spherical surface into a spherical groove at the upper end part of the carbon brush 3 at the joint of the lower end of the carbon brush 3 and the brush box 5 with a slip ring 6 during working, inserting a coil spring 1 into an arc surface at the top end of the self-centering ball 2, and pressing the coil spring 1 on the arc surface at the upper surface of the self-centering ball 2. The structure can be applied to double-fed wind power products, the lateral separation of a coil spring is eliminated, the quality problems of lateral eccentric wear, poor contact and the like of the carbon brush are avoided, the quality and the service life of the motor are improved, when the radial runout quantity of the outer diameter of the slip ring is large, the contact area between the spherical structure of the self-centering ball and the slip ring is automatically adjusted along with the stress change of the carbon brush, the ring fire caused by the fact that the carbon brush is separated from the slip ring can be avoided, and the structure can be applied to transmitting energy or signals between the fixed part and the rotating part of other rotating machinery.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.

It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. The utility model provides a structure is held to motor centripetal carbon brush, its characterized in that, includes a plurality of brush box (5), brush box (5) are fixed on the brush yoke, brush (3) have been pegged graft in brush box (5), carbon brush (3) upper end position is provided with spherical groove, place self-centering ball (2) in the spherical groove, it has disc spring (1) to peg graft in the arc surface on self-centering ball (2) top.

2. A centripetal carbon brush holder structure according to claim 1, wherein said self-centering ball (2) has a downward spherical surface, and said self-centering ball (2) has a spherical groove formed at an upper end of said carbon brush (3).

3. A centripetal carbon brush holder structure according to claim 1, wherein the brush box (5) has a plurality of guide posts (4) vertically arranged on its inner wall.

4. A centripetal carbon brush holder structure for an electric motor according to claim 1, wherein said guide posts (4) are in the form of a convex arc on the inner wall of the brush box (5).

5. A centripetal carbon brush holder structure for electric motors according to claim 1, wherein said guide posts (4) are totally 8 and are uniformly distributed on four inner walls of the brush box (5), each inner wall is provided with 2, and the guide posts (4) on opposite sides are symmetrical.

6. A centripetal carbon brush holder structure according to claim 1, wherein the gap between said carbon brush (3) and said brush box (5) is uniform.

7. A centripetal carbon brush holder structure of an electric motor according to claim 1, wherein a minimum length warning scale for carbon brush use is arranged on the carbon brush (3).

8. A centripetal carbon brush holder structure according to claim 1, wherein said self-centering balls (2) are made of non-magnetic insulating material.