CN214314854U - Carbon brush assembly and direct current motor - Google Patents
Carbon brush assembly and direct current motor Download PDFInfo
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- CN214314854U CN214314854U CN202120076933.4U CN202120076933U CN214314854U CN 214314854 U CN214314854 U CN 214314854U CN 202120076933 U CN202120076933 U CN 202120076933U CN 214314854 U CN214314854 U CN 214314854U
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Abstract
The utility model relates to the technical field of electric machine, a carbon brush subassembly and direct current motor is disclosed. The carbon brush assembly comprises a spring arm frame, a spring arm and a carbon brush. Wherein, the elastic arm frame can be arranged in the motor rubber cover; the elastic arm is connected to the elastic arm frame, and a stamping groove is formed in the elastic arm; the carbon brush is arranged on the elastic arm and is positioned on one side of the groove far away from the elastic arm frame. The utility model provides a carbon brush subassembly mountable realizes the conversion of the interior current direction of DC motor in the DC motor, can effectively solve resonance and noise problem.
Description
Technical Field
The utility model relates to the technical field of electric machine, especially, relate to a carbon brush subassembly and direct current motor.
Background
Carbon brushes are sliding contacts of electrical machines that conduct electrical current, and in dc electrical machines, carbon brushes are used primarily to transfer electrical energy between the stator and rotor.
Chinese utility model patent of application number 201921189233.5 discloses a carbon brush subassembly and motor, wherein, the carbon brush subassembly includes carbon brush, brush arm and connects the electric piece, and the carbon brush is installed on the brush arm, and the brush arm can press the carbon brush on the periphery of motor steering gear, and connects electric piece and brush arm and can electrically conduct, and the electric current on the wire can transmit to the carbon brush through connecting the electric piece and brush arm, and the assembly process of motor can be simplified to above-mentioned carbon brush subassembly, improves the production efficiency of motor. However, the inventor finds that, when the carbon brush assembly is used, as the motor runs and the rotor rotates, relative sliding occurs between the carbon brush and the commutator and the slip ring of the rotor, so that groove-crossing friction occurs between the carbon brush contacts and the commutator, vibration excitation is generated, resonance of the carbon brush assembly, particularly the brush arm, is caused, great noise is generated, and normal use of the motor is affected.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a carbon brush subassembly and DC motor to solve the carbon brush subassembly in the correlation technique and install the DC motor of carbon brush subassembly and appear resonating easily, produce the technical problem of noise when using.
In order to solve the above problem, the first aspect of the present invention discloses a carbon brush assembly, including:
the elastic arm frame can be arranged in the motor rubber cover;
the elastic arm is connected to the elastic arm frame, a groove is formed in the elastic arm, and the groove is a stamping groove;
and the carbon brush is arranged on the elastic arm and is positioned on one side of the groove far away from the elastic arm frame.
Further, the depth of the groove is 0.8 mm-1.2 mm.
Further, on a plane perpendicular to the depth direction of the groove, the cross section of the groove is circular, square, rectangular, triangular or X-shaped.
Further, the spring arm is an L-shaped spring plate, the spring arm comprises a short edge, a long edge and an arc-shaped connecting portion connected between the short edge and the long edge, the groove and the carbon brush are arranged on the long edge, the short edge is arranged on the spring arm frame, and the carbon brush and the short edge are located on the same surface of the long edge.
Further, a first bending part is formed on the long edge, the first bending part is located between the carbon brush and the groove and is bent towards the surface where the carbon brush is located, and the bending angle of the first bending part is 150-170 degrees.
Furthermore, fixing holes are formed in the short edge of the elastic arm and the elastic arm frame, and the short edge of the elastic arm is fixed to the elastic arm frame through a rivet penetrating through the fixing holes.
Furthermore, a second bending part is formed at one end of the elastic arm frame, which is used for mounting the elastic arm, and the second bending part is bent towards the surface where the elastic arm is located, and the bending angle of the second bending part is 75 degrees; the bending angle of the arc-shaped connecting part is 75 degrees, and the arc-shaped connecting part is abutted to the second bending part.
Further, a third bending part is formed on the long edge, is located between the groove and the arc-shaped connecting part and is bent towards the surface deviating from the carbon brush, and the bending angle of the third bending part is 150-170 degrees.
Further, the elastic arm frame is a brass sheet, and the thickness of the elastic arm frame is 0.5 mm.
Furthermore, the elastic arm is a red copper alloy sheet, and the thickness of the elastic arm is 0.1 mm.
The utility model provides a carbon brush subassembly is through seting up the recess on playing the arm for play the arm and produce bending deformation in groove position department, can effectively promote groove position department and play the rigidity of arm, thereby can effectively improve and play the arm resonance problem. Through improving the resonance of bullet arm, can reduce the vibration between carbon brush and motor commutator, and then reduce and use the noise, ensure that carbon brush subassembly and the direct current motor of this carbon brush subassembly of installation can normal use. By adopting the carbon brush assembly with the structural design, on the premise of not additionally increasing parts, the conductive performance of the carbon brush assembly is not affected, the resonance resistance of the carbon brush assembly is effectively improved, and the noise problem caused by resonance is solved.
In a second aspect, the present invention further discloses a dc motor, including the carbon brush assembly of the first aspect.
The utility model provides a direct current motor is through offering the recess on the bullet arm at carbon brush subassembly for play the arm and produce bending deformation in groove position department, can effectively promote the rigidity of bullet arm, and then effectively improve the resonance problem of carbon brush subassembly. Through improving the resonance of carbon brush subassembly, can effectively reduce the vibration between carbon brush and motor commutator, and then reduce the noise in the direct current motor use, ensure that direct current motor can normal use.
Drawings
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a carbon brush assembly according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a bail arm in the carbon brush assembly shown in FIG. 1;
FIG. 3 is a schematic view of a spring arm of the carbon brush assembly shown in FIG. 1;
fig. 4 is a schematic structural view of another carbon brush assembly according to an embodiment of the present invention;
FIG. 5 is a schematic view of a spring arm of the carbon brush assembly shown in FIG. 4;
fig. 6 is a schematic structural view of another carbon brush assembly according to an embodiment of the present invention;
FIG. 7 is a schematic view of a spring arm of the carbon brush assembly shown in FIG. 6;
fig. 8 is a flowchart of a manufacturing method of a carbon brush assembly according to an embodiment of the present invention.
The designations in the figures mean:
100. a carbon brush assembly;
10. a boom popping frame; 11. a second bent portion; 12. a U-shaped groove;
20. a spring arm; 21. a short side; 22. a long side; 23. an arc-shaped connecting part; 221. a groove; 222. a clamping hole; 223. a clip sheet; 224. a first bent portion; 225. a third bent portion;
30. a carbon brush;
40. a fixing hole; 41. and (4) riveting.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention will be further described in detail with reference to the accompanying drawings, which are examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", 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 do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In a first aspect, an embodiment of the present invention provides a carbon brush assembly. As shown in fig. 1, 2 and 3, the carbon brush assembly 100 includes a cartridge arm 10, a cartridge arm 20 and a carbon brush 30. Wherein, the elastic arm frame 10 can be installed in the motor rubber cover. The elastic arm 20 is connected to the elastic arm frame 10, and a groove 221 is formed on the elastic arm 20. The carbon brush 30 is disposed on the spring arm 20 and located on a side of the groove 221 away from the spring arm support 10.
The carbon brush assembly 100 may be installed in a dc motor for introducing or discharging dc voltage or dc current. Specifically, in use, the elastic arm frame 10 is installed in the motor rubber cover, and the carbon brush 30 is pressed onto the circumferential surface of the motor commutator by the elastic arm 20. When the motor runs, the commutator is in sliding contact with the carbon brushes 30 and conducts electricity, and the fixed carbon brushes 30 are contacted alternately along with the continuous rotation of the rotor, so that the current direction in the rotor coil can be switched.
The utility model provides a carbon brush subassembly 100 is through seting up recess 221 on playing arm 20 for play arm 20 produces bending deformation in recess 221 position department, can effectively promote the rigidity that recess 221 position department played arm 20, thereby can effectively improve and play arm 20 resonance problem. By improving the resonance of the elastic arm 20, the vibration between the carbon brush 30 and the commutator of the motor can be reduced, so that the use noise is reduced, and the carbon brush assembly 100 and the motor provided with the carbon brush assembly 100 can be ensured to be normally used. The carbon brush assembly 100 adopting the structural design ensures that the conductivity of the carbon brush assembly 100 is not affected on the premise of not additionally adding parts, effectively improves the resonance resistance of the carbon brush assembly 100, and solves the noise problem caused by resonance.
It should be noted that, when the carbon brush assembly 100 is used, the spring arm support 10 needs to be installed in the motor rubber cover, so that the constraint rigidity is high and resonance is not easy to occur; the carbon brush 30 is generally formed by sintering graphite and other materials, and has a hexahedral block structure as a whole, which is high in rigidity and is not likely to resonate.
In one embodiment provided by the present invention, the groove 221 is a stamped groove 221. The groove 221 is manufactured by using a die and a stamping device, so that the operation is simple, the efficiency is high, and the material consumption is low.
Optionally, the depth of the groove 221 is 0.8mm to 1.2 mm.
It should be noted that the specific size and position of the groove 221 should be determined by finite element analysis according to the mode shape and frequency of the resonance of the elastic arm 20. Groove 221 is designed to ensure that groove 221 does not interfere with the original bend, cuff, etc. configuration of spring arm 20 and other components used in conjunction therewith.
The shape of the groove 221 is not unique according to the mode shape of the elastic arm 20.
For example, in an embodiment provided by the present invention, if the elastic arm 20 has a first-order bending resonance to generate vibration noise, as shown in fig. 1 and 3, the cross section of the groove 221 may be designed to be circular on a plane perpendicular to the depth direction of the groove 221.
For example, in an embodiment provided by the present invention, if the elastic arm 20 has a second order bending resonance to generate vibration noise, as shown in fig. 4 and 5, the cross section of the groove 221 may be designed to be square on a plane perpendicular to the depth direction of the groove 221.
For example, in an embodiment provided by the present invention, if the elastic arm 20 has a second order torsional resonance to generate vibration noise, as shown in fig. 6 and 7, the cross section of the groove 221 may be designed to be X-shaped on a plane perpendicular to the depth direction of the groove 221.
Of course, in other embodiments, the cross section of the groove 221 may also be rectangular or triangular on a plane perpendicular to the depth direction of the groove 221, which is not limited herein as the case may be.
In an embodiment of the present invention, as shown in fig. 1 and 3, the elastic arm 20 is an L-shaped elastic piece, the elastic arm 20 includes a short edge 21, a long edge 22 and an arc-shaped connecting portion 23 connected between the short edge 21 and the long edge 22, the groove 221 and the carbon brush 30 are disposed on the long edge 22, the short edge 21 is mounted on the elastic arm 10, and the carbon brush 30 and the short edge 21 are located on the same surface of the long edge 22.
As shown in fig. 1 and fig. 3, the carbon brush 30 is a convex block-shaped component, and the long side 22 of the elastic arm 20 is provided with a clamping hole 222 which is matched and clamped with the convex side of the carbon brush 30. The carbon brush 30 is fixed on the elastic arm 20 in a clamping manner, so that the carbon brush is convenient to disassemble and assemble and easy to replace.
In order to ensure the fixing effect of the clamping hole 222, in an embodiment of the present invention, as shown in fig. 1 and fig. 3, the clamping hole 222 is a square trumpet-shaped clamping hole, and a clamping piece 223 capable of pressing the carbon brush 30 is further disposed on the edge of the clamping hole 222.
In order to further improve the resonance resistance of the elastic arm 20, in an embodiment of the present invention, as shown in fig. 1 and 3, a first bending portion 224 is further formed on the long side 22 of the elastic arm 20, the first bending portion 224 is located between the carbon brush 30 and the groove 221, and is bent toward a surface where the carbon brush 30 is located, and a bending angle of the first bending portion 224 is 160 °. By designing the first bending part 224, the bending deformation of the long side 22 of the elastic arm 20 can be improved, and the groove 221 prestressed area is formed, so that the rigidity of the elastic arm 20 is effectively enhanced, and the resonance resistance of the elastic arm is improved. In addition, the first bending part 224 bends toward the surface where the carbon brush 30 is located, so that the pressing effect of the elastic arm 20 on the carbon brush 30 can be ensured, and the carbon brush 30 can be firmly pressed onto the circumferential surface of the motor commutator in use.
Of course, in some embodiments, the bending angle of the first bent portion 224 may also be any value within 150 ° to 170 °, and is not limited herein.
In order to facilitate the connection between the elastic arm 20 and the elastic arm support 10, in an embodiment of the present invention, as shown in fig. 1, fig. 2 and fig. 3, fixing holes 40 are formed on the short edge 21 of the elastic arm 20 and the elastic arm support 10, and the short edge 21 of the elastic arm 20 is fixed on the elastic arm support 10 by rivets 41 inserted into the fixing holes 40. The rivet 41 has good connection plasticity and toughness, high reliability, convenient disassembly and assembly and easy inspection.
In order to further improve the resonance resistance of the elastic arm 20, in the utility model provides an embodiment, as shown in fig. 1, fig. 2 and fig. 3, the one end that the elastic arm support 10 is used for installing the elastic arm 20 is formed with the second kink 11, and the second kink 11 is bent towards the one side where the elastic arm 20 is located, and the bending angle of the second kink 11 is 75 °, and the bending angle of the arc connecting portion 23 is 75 °, and the arc connecting portion 23 is abutted with the second kink 11. Through designing the second bending part 11 and the arc-shaped connecting part 23, a groove 221 prestress area can be formed on the elastic arm frame 10 and the elastic arm 20, so that the rigidity of the elastic arm 20 is effectively enhanced, and the resonance resistance of the elastic arm is improved. In addition, the second bending part 11 of the spring arm support 10 abuts against the arc-shaped connecting part 23 of the spring arm 20, so that the strength of the bending part of the carbon brush assembly 100 can be effectively improved, and the damage risk in the use process is reduced.
It should be noted that, as shown in fig. 1 and fig. 2, a U-shaped groove 12 is further formed at an end of the elastic arm frame 10 away from the second bending portion 11, the U-shaped groove 12 is formed by three 90 ° bending angles, a notch thereof is located at a side away from the elastic arm 20, and the U-shaped groove 12 is used for installing and fixing the elastic arm frame 10.
In order to further improve the resonance resistance of the elastic arm 20, in an embodiment of the present invention, as shown in fig. 1 and fig. 3, a third bending portion 225 is further formed on the long side 22 of the elastic arm 20, the third bending portion 225 is located between the groove 221 and the arc-shaped connecting portion 23, and the side facing away from the carbon brush 30 is bent, and the bending angle of the third bending portion 225 is 160 °. By designing the third bending part 225, the bending deformation of the long side 22 of the elastic arm 20 can be improved, and the groove 221 prestressed area is formed, so that the rigidity of the elastic arm 20 is effectively enhanced, and the resonance resistance of the elastic arm is improved.
Of course, in some embodiments, the bending angle of third bent portion 225 may also be any value within 150 ° to 170 °, and is not limited in this regard.
In one embodiment of the present invention, the elastic arm frame 10 is a brass sheet, and the thickness of the elastic arm frame 10 is 0.5 mm. The brass material has higher strength and good plasticity, and the elastic arm frame 10 made of the brass material has stable structure and is not easy to deform.
In one embodiment of the present invention, the elastic arm 20 is made of red copper alloy, and the thickness of the elastic arm 20 is 0.1 mm. The red copper alloy material has good electrical conductivity and thermal conductivity, and can rapidly conduct out heat generated by the rotation of the carbon brush 30.
In a second aspect, embodiments of the present invention further provide a dc motor, including the carbon brush assembly 100 as in the first aspect.
The embodiment of the utility model provides a direct current motor, inside has installed carbon brush subassembly 100, and wherein, the bullet arm rest 10 of carbon brush subassembly 100 is installed in the motor rubber cover, and carbon brush 30 is pressed to the periphery of motor commutator under the effect of bullet arm 20. When the direct current motor operates, the commutator is in sliding contact with the carbon brushes 30 and conducts electricity, and the commutator is in continuous rotation with the rotor and alternately contacts the fixed carbon brushes 30, so that the current direction in the rotor coil can be switched.
The utility model provides a direct current motor through set up recess 221 on carbon brush assembly 100's bullet arm 20 for bullet arm 20 produces bending deformation in recess 221 position department, can effectively promote the rigidity of bullet arm 20, and then effectively improves carbon brush assembly 100's resonance problem. By improving the resonance of the carbon brush assembly 100, the vibration between the carbon brush 30 and the motor commutator can be effectively reduced, so that the noise of the direct current motor in the use process is reduced, and the direct current motor can be normally used.
In a third aspect, an embodiment of the present invention further provides a manufacturing method of the carbon brush assembly 100, where the carbon brush assembly 100 includes an elastic arm frame 10, an elastic arm 20 disposed on the elastic arm frame 10, and a carbon brush 30 disposed on the elastic arm 20, and the elastic arm 20 is further provided with a groove 221. As shown in fig. 1 and 8, the manufacturing method of the carbon brush assembly 100 includes:
s1: and (4) performing test mode analysis test on the carbon brush assembly 100, and determining the position where the amplitude of the elastic arm 20 is maximum.
By performing a test modal analysis test on the carbon brush assembly 100, the resonance frequency and the resonance mode of the spring arm 20, that is, the mode can be determined, so that the maximum amplitude position of the spring arm 20 can be determined. The resonance resistance of the elastic arm 20 can be effectively improved by improving and optimizing the structure at the maximum position of the amplitude of the elastic arm 20.
It should be noted that, when the carbon brush assembly 100 is used, the spring arm support 10 needs to be installed in the motor rubber cover, so that the constraint rigidity is large and resonance is not easy to occur; the carbon brush 30 is generally formed by sintering graphite and other materials, and has a hexahedral block structure as a whole, which is high in rigidity and is not likely to resonate.
S2: a groove 221 is formed at the maximum amplitude position of the elastic arm 20.
The shape of the groove 221 is not unique according to the mode shape of the elastic arm 20. For example, if the elastic arm 20 has first-order bending resonance to generate vibration noise, the cross section of the groove 221 may be circular in a plane perpendicular to the depth direction of the groove 221; if the elastic arm 20 has second-order bending resonance to generate vibration noise, the cross section of the groove 221 may be square on a plane perpendicular to the depth direction of the groove 221; if the elastic arm 20 has second order torsional resonance to generate vibration noise, the cross section of the groove 221 may be X-shaped on a plane perpendicular to the depth direction of the groove 221. Of course, in other embodiments, the cross section of the groove 221 may also be rectangular or triangular on a plane perpendicular to the depth direction of the groove 221, which is not limited herein as the case may be.
The utility model provides a manufacturing method of carbon brush subassembly 100 through carrying out experimental modal analysis test to carbon brush subassembly 100, can confirm 20 amplitude maximum position departments of bullet arm to set up recess 221 in amplitude maximum position department, can effectively promote the rigidity of bullet arm 20, thereby can effectively improve the resonance problem of bullet arm 20. By improving the resonance of the elastic arm 20, the vibration between the carbon brush 30 and the commutator of the motor can be reduced, so that the use noise is reduced, and the carbon brush assembly 100 and the motor provided with the carbon brush assembly 100 can be ensured to be normally used.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A carbon brush assembly, comprising:
the elastic arm frame can be arranged in the motor rubber cover;
the elastic arm is connected to the elastic arm frame, a groove is formed in the elastic arm, and the groove is a stamping groove;
and the carbon brush is arranged on the elastic arm and is positioned on one side of the groove far away from the elastic arm frame.
2. The carbon brush assembly according to claim 1, wherein a cross-section of the groove is circular, square, rectangular, triangular, or X-shaped on a plane perpendicular to a depth direction of the groove;
the depth of the groove is 0.8 mm-1.2 mm.
3. The carbon brush assembly according to claim 1, wherein the spring arm is an L-shaped spring plate, the spring arm includes a short side, a long side, and an arc-shaped connecting portion connected between the short side and the long side, the groove and the carbon brush are disposed on the long side, the short side is mounted on the spring arm, and the carbon brush and the short side are located on a same surface of the long side.
4. The carbon brush assembly according to claim 3, wherein a first bent portion is further formed on the long side, the first bent portion is located between the carbon brush and the groove and bent toward a surface where the carbon brush is located, and a bending angle of the first bent portion is 150 ° to 170 °.
5. The carbon brush assembly according to claim 3, wherein fixing holes are formed in the short side of the spring arm and the spring arm support, and the short side of the spring arm is fixed to the spring arm support through a rivet penetrating through the fixing holes.
6. The carbon brush assembly according to claim 3, wherein a second bent portion is formed at one end of the spring arm support for mounting the spring arm, the second bent portion is bent toward a surface of the spring arm, and a bending angle of the second bent portion is 75 degrees;
the bending angle of the arc-shaped connecting part is 75 degrees, and the arc-shaped connecting part is abutted to the second bending part.
7. The carbon brush assembly according to claim 3, wherein a third bent portion is further formed on the long side, the third bent portion is located between the groove and the arc-shaped connecting portion and bent toward a surface away from the carbon brush, and a bending angle of the third bent portion is 150 ° to 170 °.
8. The carbon brush assembly according to claim 1, wherein the spring arm is a brass plate, and a thickness of the spring arm is 0.5 mm.
9. The carbon brush assembly according to claim 1, wherein the elastic arm is a red copper alloy sheet, and a thickness of the elastic arm is 0.1 mm.
10. A direct current motor comprising a carbon brush assembly according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120076933.4U CN214314854U (en) | 2021-01-12 | 2021-01-12 | Carbon brush assembly and direct current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120076933.4U CN214314854U (en) | 2021-01-12 | 2021-01-12 | Carbon brush assembly and direct current motor |
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| CN214314854U true CN214314854U (en) | 2021-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112671178A (en) * | 2021-01-12 | 2021-04-16 | 捷和电机制品(深圳)有限公司 | Carbon brush assembly, direct current motor and manufacturing method of carbon brush assembly |
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2021
- 2021-01-12 CN CN202120076933.4U patent/CN214314854U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112671178A (en) * | 2021-01-12 | 2021-04-16 | 捷和电机制品(深圳)有限公司 | Carbon brush assembly, direct current motor and manufacturing method of carbon brush assembly |
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