CN111864496A - Novel commutator of noise-reduction micromotor and electric brush assembly of novel commutator - Google Patents
Novel commutator of noise-reduction micromotor and electric brush assembly of novel commutator Download PDFInfo
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- CN111864496A CN111864496A CN202010880409.2A CN202010880409A CN111864496A CN 111864496 A CN111864496 A CN 111864496A CN 202010880409 A CN202010880409 A CN 202010880409A CN 111864496 A CN111864496 A CN 111864496A
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- 238000013016 damping Methods 0.000 claims abstract description 8
- PQJKKINZCUWVKL-UHFFFAOYSA-N [Ni].[Cu].[Ag] Chemical compound [Ni].[Cu].[Ag] PQJKKINZCUWVKL-UHFFFAOYSA-N 0.000 claims description 11
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 7
- 229910001264 Th alloy Inorganic materials 0.000 claims description 5
- 229910001252 Pd alloy Inorganic materials 0.000 claims description 4
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 23
- 230000008569 process Effects 0.000 abstract description 23
- 238000009434 installation Methods 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/022—Details for dynamo electric machines characterised by the materials used, e.g. ceramics
- H01R39/025—Conductive materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/04—Commutators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/006—Structural associations of commutators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/10—Arrangements of brushes or commutators specially adapted for improving commutation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/10—Arrangements of brushes or commutators specially adapted for improving commutation
- H02K13/105—Spark suppressors associated with the commutator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
The invention discloses a novel commutator of a noise-reducing micromotor and an electric brush assembly thereof, comprising a commutator connected with a micromotor rotor and an electric brush assembly in sliding contact with the surface of the commutator; the commutator comprises an insulating sleeve and a plurality of commutator segments, and the electric brush assembly comprises an electric brush frame, two electric brushes which are respectively partially attached to the surface of the commutator and two damping bars which can reduce the vibration of the electric brushes. The brush component has small elasticity, generates smaller noise compared with a carbon brush, can be abutted against the commutator in a smaller contact area, has good contact property, reduces the noise generated between the commutator and the brush during operation, can also quickly dissipate the heat generated during the operation of the micro motor, and prolongs the service life of the micro motor; the electric brush assembly can be contacted with the copper-based wear-resistant sheet, so that the electric brush is prevented from contacting with burrs on the commutator bar to generate noise and sparks; the positioning block can improve the installation stability of the commutator segment, prevent the commutator segment from loosening in the operation process and effectively reduce vibration and noise.
Description
Technical Field
The invention relates to the field of micromotors, in particular to a novel commutator of a noise-reducing micromotor and an electric brush assembly of the novel commutator.
Background
Micro-motors, collectively referred to as "micro-motors," are commonly used in control systems or transmission mechanical loads to perform functions such as detection, analytical operation, amplification, execution, or conversion of electromechanical signals or energy.
The commutator, also called a commutator, is an important component of a direct current motor, and is a component which can enable the motor to continuously rotate, and the commutator can convert direct current passing through the brush into alternating current in the winding or convert alternating electromotive force in the winding into direct electromotive force on the brush end.
The electric brush, also called carbon brush, is a device for transmitting energy or signals between a fixed part and a rotating part of a motor or a generator or other rotating machinery, is generally in a square shape, is clamped on a metal bracket, is tightly pressed on a rotating shaft by a spring inside, and can transmit electric energy to a coil through a commutator when the motor rotates.
In the prior art, in the running process of the motor, the commutator needs to bear the action of centrifugal force and thermal stress, and can not loosen and deform, which puts higher requirements on the smoothness of the working surface and the structural stability of the commutator segments. In the machining process of commutator segments on the market, flanging and burrs are easy to occur, so that the electric brush can generate larger noise and sparks in the sliding contact process of the electric brush and the commutator segments, and the service life and the reliability of a commutator are seriously influenced; meanwhile, most of the electric brushes on the market are square carbon brush structures, and in the process of sliding contact with the surface of the commutator, the contact area between the electric brushes and the commutator is large, so that noise and vibration generated between the commutator and the electric brushes are large. The direct result brought by the problems is that the contact of the micromotor is easy to burn out, so that the micromotor is damaged, the service life of the micromotor is seriously influenced, and the commutator has larger diameter and higher noise in the running process due to the design that the linear velocity is higher.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the novel commutator of the noise-reduction micromotor and the brush component thereof can effectively reduce noise generated in the operation process, are simple to install, high in assembly efficiency and stable in operation.
The technical scheme of the invention is as follows: a novel commutator of a noise-reduction micromotor and an electric brush assembly thereof comprise a commutator connected with a micromotor rotor and an electric brush assembly in sliding contact with the surface of the commutator;
the commutator comprises an insulating sleeve, a plurality of commutator segments and a plurality of positioning blocks, wherein the insulating sleeve penetrates through the commutator in the axial direction, the positioning blocks are used for fixing the commutator segments, a fixed disc is arranged in the middle of the insulating sleeve, and the positioning blocks are arranged at intervals along the circumferential direction of the fixed disc;
the bottom of one end of the positioning block, which is far away from the fixed disc, is provided with a lug extending outwards, and bayonets are respectively arranged in the positioning blocks on the two sides of the lug;
the commutator segment is arranged on the outer wall of the insulating sleeve in a surrounding manner, one end of the commutator segment is positioned between bayonets of two adjacent positioning blocks, radial grooves are respectively arranged between the two adjacent commutator segments, and the convex blocks are arranged in the radial grooves;
the electric brush assembly comprises an electric brush frame connected with a micromotor shell, two electric brushes respectively attached to the local parts of the surface of the commutator and two damping strips for reducing the vibration of the electric brushes, mounting holes are respectively formed in two sides of the electric brush frame, one end of each electric brush is connected with the corresponding mounting hole, and the other end of each electric brush is abutted to the surface of the commutator;
the brush is provided with a plurality of strip-shaped brush pieces which are parallel to each other, and the contact part of the strip-shaped brush pieces and the commutator is embedded with a silver-palladium-thorium alloy piece.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the electric brush component thereof, the silver-nickel-copper alloy sheet in sliding contact with the electric brush is embedded on the commutator sheet.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the electric brush assembly thereof, the commutator further comprises a fixing ring, and the fixing ring is sleeved on the commutator segment and is abutted against the side wall of the positioning block.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the brush component thereof, the end, close to the positioning block, of the commutator segment is provided with the terminal part, the commutator segments on two sides of the terminal part are positioned in the bayonets of two adjacent positioning blocks, and two sides of the terminal part are respectively abutted against the side walls of the positioning blocks.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the brush component thereof, the terminal part is of a T-shaped structure and comprises a convex tooth section and a straight section, the bottom of the straight section is connected with a commutator bar, the top of the straight section is connected with the convex tooth section, the two sides of the convex tooth section are respectively provided with an arc structure, and the two sides of the straight section are respectively provided with an arc notch.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the electric brush component thereof, the insulating sleeve, the fixed disc and the positioning blocks are of an integrally formed structure.
Adopt above-mentioned each technical scheme, novel commutator of little motor of making an uproar and brush subassembly thereof fall, the brush subassembly still includes two conductive terminal of being connected with the power cord, the mounting hole bottom is equipped with the step, conductive terminal middle part is equipped with the taper block with the mutual joint of step, conductive terminal top is connected with the brush, the one end that the mounting hole is close to the commutator is equipped with the slot that the brush of being convenient for inserts, conductive terminal bottom is equipped with the wiring mouth of being convenient for to be connected with the power cord.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the electric brush component thereof, the damping strip is arranged on the electric brush which is back to one side of the commutator.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the electric brush component thereof, the electric brush is made of silver-palladium alloy.
By adopting the technical scheme, in the novel commutator of the noise-reduction micromotor and the brush assembly thereof, the middle part of the brush holder is provided with the rear cover connected with the micromotor shell, and the middle part of the rear cover is provided with the oil-containing bearing.
By adopting the technical scheme, the parallel strip-shaped brush pieces are arranged on the electric brush, the electric brush can be abutted against the commutator in a smaller contact area, the contact performance is good, the noise generated between the commutator and the electric brush during operation is effectively reduced, meanwhile, the parallel strip-shaped brush pieces can dissipate the heat generated in the friction process, and the heat dissipation rate of the micro-motor during operation is improved; the silver-copper-nickel alloy sheet embedded on the commutator segment can enable the electric brush to be in sliding and abutting connection with the silver-copper-nickel alloy sheet, so that the electric brush is prevented from being in contact with burrs on the commutator segment to generate noise and sparks, and the service life of the commutator is effectively prolonged; the plurality of commutator segments are arranged on the insulating sleeve through the positioning blocks and the fixing rings, so that the installation is convenient, and the assembly production efficiency is improved; the bayonets and the bumps arranged on the positioning blocks can improve the installation stability of the commutator segments, prevent the commutator segments from loosening in the operation process and effectively reduce vibration and noise; the small diameter of the commutator causes the low linear velocity during operation, thereby reducing noise and effectively prolonging the service life of the micromotor; the whole assembly process is simple, the production efficiency is high, the operation is low in noise, the heat dissipation is efficient, the energy conservation is good, and the device can be popularized and used.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the commutator of the present invention;
FIG. 3 is a schematic view of the positioning block structure of the present invention;
FIG. 4 is a schematic structural diagram of a commutator segment according to the present invention;
FIG. 5 is a schematic view of a brush structure according to the present invention
FIG. 6 is a schematic view of a brush holder according to the present invention;
fig. 7 is a partially enlarged view of the area a in fig. 6.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
As shown in figure 1, the novel commutator of the noise-reduction micromotor and the brush assembly thereof comprise a commutator 1 connected with a micromotor rotor and a brush assembly 2 in sliding contact with the surface of the commutator 1. In this embodiment, the commutator 1 can perform a current commutation function on the armature winding of the micro-motor, one end of the brush assembly 2 is connected with an external power supply, and the other end is connected with the surface of the commutator 1 in a sliding contact manner, so that the brush assembly can perform a conductive function, and alternating potential in the armature winding of the micro-motor is converted into direct current to be output.
As shown in fig. 2, the commutator 1 includes an insulating sleeve 11 axially penetrating through the insulating sleeve, a plurality of commutator segments 12, and a plurality of positioning blocks 13 for fixing the commutator segments 12, wherein a fixed disk 14 is disposed in the middle of the insulating sleeve 11, and the positioning blocks 13 are disposed at intervals along the circumferential direction of the fixed disk 14. In this embodiment, the insulating sleeve 11 may be connected to a rotating shaft of the rotor, the fixing disc 14 is disposed in the middle of the insulating sleeve 11, the positioning blocks 13 are disposed at intervals along the circumferential direction of the fixing disc 14, and the positioning blocks 13 may firmly fix the commutator segment 12, thereby preventing the commutator segment 12 from loosening during operation.
As shown in fig. 3, further, the insulating sleeve 11, the fixing disc 14 and the positioning blocks 13 are integrally formed. So set up, can improve commutator 1's overall structure intensity, prevent that locating piece 13 from producing the deformation in the operation process, influencing commutator 1's life.
As shown in fig. 3, a protrusion 131 extending outward is disposed at a bottom of one end of the positioning block 13 away from the fixed disc 14, and bayonets 130 are respectively disposed in the positioning blocks 13 on two sides of the protrusion 131.
As shown in fig. 1 and 2, the commutator segment 12 is disposed around the outer wall of the insulating sleeve 11, one end of the commutator segment 12 is located between the bayonets 130 of two adjacent positioning blocks 13, radial grooves 100 are respectively disposed between two adjacent commutator segments 12, and the protrusions 131 are disposed in the radial grooves 100.
As shown in fig. 1, further, the commutator 1 further includes a fixing ring 16, and the fixing ring 16 is sleeved on the commutator segment 12 and abuts against the side wall of the positioning block 13.
As shown in fig. 1 to 3, in this embodiment, one end of the commutator segment 12 is engaged in the bayonet 130 between the two positioning blocks 13, and the commutator segment 12 is compacted and fixed by the fixing ring 16, so as to be arranged, while the installation stability of the commutator segment 12 is improved, the commutator segment 12 is convenient for users to disassemble, assemble and maintain, when the damaged commutator segment 12 needs to be replaced, only the fixing ring 16 needs to be slid off from the insulating sleeve 11, and then the commutator segment 12 can be slid off from the inner side of the bayonet 130 between the two positioning blocks 13, which is simple and convenient, and the convenience of the disassembly and assembly of the annular device 1 is effectively improved. In addition, the projection 131 of the positioning block 13 is disposed in the radial groove 100, so that the commutator segment 12 can be effectively prevented from shifting laterally in the operation process, the vibration of the commutator 1 caused by the loose structure in the operation process can be effectively reduced, and the effect of reducing noise can be achieved.
As shown in fig. 1, the brush assembly 2 includes a brush holder 21 connected to the micro-motor housing, two brushes 22 respectively attached to the surface of the commutator 1, and two damping bars 23 for reducing the vibration of the brushes 22, wherein mounting holes 210 are respectively formed at two sides of the brush holder 21, one end of each brush 22 is connected to the mounting hole 210, and the other end of each brush 22 abuts against the surface of the commutator 1. In this embodiment, one end of the brush 22 is connected to an external power line, and the other end of the brush 22 is in sliding contact with the surface of the commutator 1, so that when the commutator 1 rotates, the brush 22 can always contact with the surface of the segment 12 to achieve current conduction.
As shown in fig. 5, the brush 22 is provided with a plurality of strip-shaped brush pieces 220 parallel to each other, and the contact part of the strip-shaped brush pieces 220 and the commutator 1 is embedded with a silver-palladium-thorium alloy piece 24. In this embodiment, the ag-pd-th alloy sheet 24 may contact the surface of the commutator 1 to realize the current conduction function. The arrangement of the strip-shaped brush piece 220 can reduce the contact area between the electric brush 22 and the commutator 1, reduce the noise generated between the commutator 1 and the electric brush 22 in the rotating process, and also can improve the heat dissipation rate of the micromotor, the silver-palladium-thorium alloy piece 24 can generate certain heat in the surface contact process with the commutator 1, the heat can be dissipated from the gap between the strip-shaped brush pieces 220, the heat is prevented from being gathered on the electric brush 22, and the service life of the electric brush assembly 2 is influenced by the generated sparks.
As shown in fig. 4, further, the commutator segment 12 is embedded with a silver-nickel-copper alloy segment 15 in sliding contact with the brush 22. The surface of the commutator segment 12 is inevitably burred during the process, and when the brush 22 of the micro-motor contacts with the commutator segment 12 for commutation, the burred of the commutator segment 12 is scraped, thereby generating larger noise and sparks. In this embodiment, the silver-nickel-copper alloy sheet 15 is embedded on the commutator segment 12, so that the brush 22 of the micro-motor can directly contact with the silver-nickel-copper alloy sheet 15, because the surface of the silver-nickel-copper alloy sheet 15 is smooth, the noise and the spark generated in the operation process of the commutator 1 can be effectively reduced, and the silver-nickel-copper alloy sheet 15 has good wear resistance, so that the service life of the commutator 1 can be effectively prolonged.
As shown in fig. 2 to 4, further, a terminal portion 17 is disposed at one end of the commutator segment 12 close to the positioning block 13, the commutator segments 12 at two sides of the terminal portion 17 are located in the bayonets 130 of two adjacent positioning blocks 13, and two sides of the terminal portion 17 are respectively abutted against the side walls of the positioning blocks 13. In the present embodiment, the terminal portion 17 may be connected to an armature winding in the micro-motor to correspondingly connect a corresponding portion of the armature winding to each segment 12. The commutator segments 12 on two sides of the terminal part 17 are clamped with the bayonets 130 of two adjacent positioning blocks 13, so that the installation stability of the commutator segments 12 can be improved; two sides of the terminal part 17 are respectively abutted against the side walls of the positioning block 13, so that the terminal part 17 can be prevented from driving the commutator segment 12 to shift in the operation process.
As shown in fig. 4, further, the terminal portion 17 is a T-shaped structure, the terminal portion 17 includes a convex tooth section 171 and a straight section 172, the bottom of the straight section 172 is connected with the commutator segment 12, the top of the straight section 172 is connected with the convex tooth section 171, two sides of the convex tooth section 171 are respectively provided with an arc structure 1710, and two sides of the straight section 172 are respectively provided with an arc notch 1720. In this embodiment, the straight section 172 can facilitate the winding of the coil of the armature winding, and the protruding tooth section 171 can provide a limiting and fixing function for the coil of the armature winding. The arrangement of the arc structure 1710 and the arc notch 1720 can facilitate the coil introduction of the armature winding.
As shown in fig. 1 and 5, the damping bars 23 are further provided on the brushes 22 on the side facing away from the commutator 1. In this embodiment, the damping strip 23 is arranged to provide a pressure to the brush 22, so that the end surface of the brush 22 close to the commutator 1 can be slidably pressed on the surface of the copper-based wear plate 15, thereby reducing the vibration generated by the brush 22 during the sliding process on the surface of the commutator 1 and prolonging the service life of the brush assembly 2.
Further, the brush 22 is made of silver palladium alloy. In this embodiment, the silver-palladium alloy has good wear resistance, prevents the brush 22 from being worn in the contact process with the commutator 1, and can improve the arcing voltage of the contact material, prevent sparks from being generated, prevent the surface of the commutator 1 from being burnt, and avoid electromagnetic interference.
As shown in fig. 5 to 7, further, the brush assembly 2 further includes two conductive terminals 25 connected to a power line, the bottom of the mounting hole 210 is provided with a step 2101, the middle of the conductive terminal 25 is provided with a taper block 251 mutually clamped with the step 2101, the top of the conductive terminal 25 is connected to the brush 22, one end of the mounting hole 210 close to the commutator 12 is provided with a slot 2102 for inserting the brush 22, and the bottom of the conductive terminal 25 is provided with a wiring port 250 for connecting to the power line. In this embodiment, the conductive terminal 25 can achieve current conduction connection between an external power line and the brush 22, and the step 2101 disposed at the bottom of the mounting hole 210 can be fast clamped with the tapered block 251 disposed at the middle portion of the conductive terminal 25, so as to facilitate the mounting and dismounting of the conductive terminal 25 and improve the convenience of the damage and maintenance of the brush assembly 2.
As shown in fig. 1, further, a rear cover 26 connected to the micro-motor housing is provided at the middle of the brush holder 21, and an oil-containing bearing 27 is provided at the middle of the rear cover 26. In this embodiment, the oil-containing bearing 27 disposed in the middle of the back cover 26 can be installed in connection with the rotating shaft of the micro-motor, so as to reduce the friction force generated by the rotating shaft during the rotation process and reduce the friction noise.
By adopting the technical scheme, the parallel strip-shaped brush pieces are arranged on the electric brush, the electric brush can be abutted against the commutator in a smaller contact area, the contact performance is good, the noise generated between the commutator and the electric brush during operation is effectively reduced, meanwhile, the parallel strip-shaped brush pieces can dissipate the heat generated in the friction process, and the heat dissipation rate of the micro-motor during operation is improved; the silver-copper-nickel alloy sheet embedded on the commutator segment can enable the electric brush to be in sliding and abutting connection with the silver-copper-nickel alloy sheet, so that the electric brush is prevented from being in contact with burrs on the commutator segment to generate noise and sparks, and the service life of the commutator is effectively prolonged; the plurality of commutator segments are arranged on the insulating sleeve through the positioning blocks and the fixing rings, so that the installation is convenient, and the assembly production efficiency is improved; the bayonets and the bumps arranged on the positioning blocks can improve the installation stability of the commutator segments, prevent the commutator segments from loosening in the operation process and effectively reduce vibration and noise; the small diameter of the commutator causes the low linear velocity during operation, thereby reducing noise and effectively prolonging the service life of the micromotor; the whole assembly process is simple, the production efficiency is high, the operation is low in noise, the heat dissipation is efficient, the energy conservation is good, and the device can be popularized and used.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a novel commutator of micromotor and brush subassembly falls makes an uproar which characterized in that: the brush assembly comprises a commutator connected with a micromotor rotor and a brush assembly in sliding contact with the surface of the commutator;
the commutator comprises an insulating sleeve, a plurality of commutator segments and a plurality of positioning blocks, wherein the insulating sleeve penetrates through the commutator in the axial direction, the positioning blocks are used for fixing the commutator segments, a fixed disc is arranged in the middle of the insulating sleeve, and the positioning blocks are arranged at intervals along the circumferential direction of the fixed disc;
the bottom of one end of the positioning block, which is far away from the fixed disc, is provided with a lug extending outwards, and bayonets are respectively arranged in the positioning blocks on the two sides of the lug;
the commutator segment is arranged on the outer wall of the insulating sleeve in a surrounding manner, one end of the commutator segment is positioned between bayonets of two adjacent positioning blocks, radial grooves are respectively arranged between the two adjacent commutator segments, and the convex blocks are arranged in the radial grooves;
the electric brush assembly comprises an electric brush frame connected with a micromotor shell, two electric brushes respectively attached to the local parts of the surface of the commutator and two damping strips for reducing the vibration of the electric brushes, mounting holes are respectively formed in two sides of the electric brush frame, one end of each electric brush is connected with the corresponding mounting hole, and the other end of each electric brush is abutted to the surface of the commutator;
the brush is provided with a plurality of strip-shaped brush pieces which are parallel to each other, and the contact part of the strip-shaped brush pieces and the commutator is embedded with a silver-palladium-thorium alloy piece.
2. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: and a silver-nickel-copper alloy sheet in sliding contact with the electric brush is embedded on the commutator bar.
3. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the commutator also comprises a fixing ring which is sleeved on the commutator segment and is abutted against the side wall of the positioning block.
4. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the commutator segment is provided with a terminal part at one end close to the positioning blocks, the commutator segments at two sides of the terminal part are positioned in the bayonets of two adjacent positioning blocks, and two sides of the terminal part are respectively abutted against the side walls of the positioning blocks.
5. The novel commutator and brush assembly of noise-reducing micromotor according to claim 4, characterized in that: the terminal part is of a T-shaped structure and comprises a convex tooth section and a straight section, the bottom of the straight section is connected with the commutator segment, the top of the straight section is connected with the convex tooth section, arc structures are respectively arranged on two sides of the convex tooth section, and arc notches are respectively arranged on two sides of the straight section.
6. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the insulating sleeve, the fixed disc and the positioning blocks are of an integrally formed structure.
7. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the brush subassembly is still including two conductive terminal of being connected with the power cord, the mounting hole bottom is equipped with the step, conductive terminal middle part is equipped with the awl piece with the mutual joint of step, the conductive terminal top is connected with the brush, the one end that the mounting hole is close to the commutator is equipped with the slot of being convenient for the brush to insert, the conductive terminal bottom is equipped with the wiring mouth of being convenient for to be connected with the power cord.
8. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the damping strip is arranged on the electric brush on one side back to the commutator.
9. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the electric brush is made of silver palladium alloy.
10. The novel commutator and brush assembly of noise-reducing micromotor according to claim 1, characterized in that: the middle part of the electric brush frame is provided with a rear cover connected with the micro motor shell, and the middle part of the rear cover is provided with an oil-containing bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010880409.2A CN111864496A (en) | 2020-08-27 | 2020-08-27 | Novel commutator of noise-reduction micromotor and electric brush assembly of novel commutator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010880409.2A CN111864496A (en) | 2020-08-27 | 2020-08-27 | Novel commutator of noise-reduction micromotor and electric brush assembly of novel commutator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115694091A (en) * | 2022-08-24 | 2023-02-03 | 扬州市华胜机电制造有限公司 | Commutator motor with improved structure |
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| CN201726017U (en) * | 2010-05-27 | 2011-01-26 | 重庆昆旺电子有限责任公司 | Conjoined electric brush |
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| CN115694091A (en) * | 2022-08-24 | 2023-02-03 | 扬州市华胜机电制造有限公司 | Commutator motor with improved structure |
| CN115694091B (en) * | 2022-08-24 | 2023-09-29 | 江苏华胜电机(集团)有限公司 | Commutator motor with improved structure |
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