CN108512365B - DC motor - Google Patents
DC motor Download PDFInfo
- Publication number
- CN108512365B CN108512365B CN201810349364.9A CN201810349364A CN108512365B CN 108512365 B CN108512365 B CN 108512365B CN 201810349364 A CN201810349364 A CN 201810349364A CN 108512365 B CN108512365 B CN 108512365B
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- Prior art keywords
- brush
- resistor
- end cover
- rear end
- assembly
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 37
- 229910052799 carbon Inorganic materials 0.000 claims description 37
- 239000003990 capacitor Substances 0.000 claims description 35
- 239000004576 sand Substances 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 239000000428 dust Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 6
- 238000005192 partition Methods 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/0094—Structural association with other electrical or electronic devices
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/14—Means for supporting or protecting brushes or brush holders
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
The invention discloses a direct current motor, which comprises a front end cover, an armature, a stator, a brush holder assembly and a rear end cover assembly, wherein the rear end cover assembly comprises a rear end cover body and a resistor assembly, the resistor assembly comprises a resistor cover, a resistor sheet and two inserting sheets, the two inserting sheets are connected to two ends of the resistor sheet, the resistor assembly further comprises an annular support and two annular insulating pads, the support is connected to the outer side of the rear end cover body, the resistor cover is annular, the edge of the resistor cover is connected with the edge of the support to form an annular cavity, the resistor sheet is of an annular structure formed by connecting a plurality of omega-shaped units, the two insulating pads are arranged on two sides of the resistor sheet to form a sandwich structure, and the sandwich structure is arranged in the annular cavity. The resistor disc is arranged into the annular structure, so that a larger radial space is reserved for the bearing chamber of the rear end cover body, the heat dissipation of the resistor disc is facilitated, and the heat dissipation performance of the motor can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a direct current motor.
Background
Fig. 1 and 2 show a conventional variable speed dc motor, which is composed of a front end cover 11, an armature 12, a stator 13, a brush holder assembly 14, a rear end cover assembly 15, and the like. Wherein the armature 12 is comprised of windings 121, insulating sleeve 122, core 123, shaft 124 and commutator 125. The brush holder assembly 14 is composed of a spring plate, a socket, a brush basin bottom plate 141, a brush holder 142, a carbon brush 143, a pressure spring 144, an inductor, a capacitor and the like. The rear end cap assembly 15 is composed of a rear end cap 151, a resistor sheet 152, a resistor sheet cover 153, an insulating pad 154, an insert sheet, and the like. The front end cover 11 and the rear end cover 151 are fixed in relative positions by the stator 13, as shown in fig. 2. The winding 121 is insulated from the iron core 123 by the insulating sleeve 122, is hung on the hook of the commutator segment, the shaft 124 passes through the center of the iron core 123 and the commutator 125, and the iron core 123 and the commutator 125 coaxially rotate to form a complete armature. The shaft 124 has bearings at both ends, and the front end cover 11 and the rear end cover 151 have bearing chambers at the centers thereof and support bearings so that the armature can rotate in the motor. In the brush holder assembly 14, a brush holder 142 is mounted on a brush basin bottom plate 141, and a carbon brush 143 is wrapped in the sliding brush holder 142 and is attached to the commutator 125 by a compression spring 144. In the rear cap assembly 15, the resistor 152 is insulated from the resistor cover 153 by an insulating pad 153 to prevent short circuits. The two ends of the resistor 152 are connected with the circuit on the brush basin bottom plate 141 through the inserting sheets and the socket.
Under the premise that the power of the motors is basically the same, the globalization of the project platform brings new requirements for the installation and the external dimension of the motors, meets different global environments, and the existing products can not completely meet the requirements, and mainly have the following problems:
1. The design of the heating and heat dissipation system of the motor is unreasonable. Mainly characterized in that (1) the front end cover and the rear end cover adopt circular ventilation holes, and the ventilation area is small. (2) As shown in FIG. 3, the variable speed resistor plate adopts a disk-shaped structure, the center of the variable speed resistor plate is close to the rear bearing, and the temperature of the rear bearing is influenced by the heat of the variable speed resistor at low speed. (3) The armature core and the commutator adopt zero-angle matching, namely the center line of the punching sheet teeth of the core coincides with the center line of the commutating sheet of the commutator, and the zero-angle matching arrangement ensures that the working current is higher, and reduces the motor efficiency.
2. The design of the environment-resistant protection structure of the motor is unreasonable. The device mainly comprises (1) a small gap between the carbon brush and the brush holder, almost in surface contact, and when sand dust and sand water are tested, the dust and sand easily cause the carbon brush to be blocked in the brush holder to cause the failure of the motor. (2) On the brush basin bottom plate, no partition plate is arranged between the anode and the cathode, which is easy to cause electric corrosion.
3. The space utilization is low. On the brush basin bottom plate, the axial space utilization rate of the electric connection part is low, and the socket and the inserting piece are installed to cause extra height, so that the motor is thicker.
Therefore, in view of the above problems, there is an urgent need to optimize the motor structure to improve the motor performance.
Disclosure of Invention
Aiming at the technical problem that the heat generating and radiating system of the direct current motor in the prior art is unreasonable in design and influences the reliability of the motor, the invention aims to provide the direct current motor, which optimizes the heat generating and radiating system and effectively improves the heat radiating performance and reliability of the direct current motor.
The direct current motor comprises a front end cover, an armature, a stator, a brush holder assembly and a rear end cover assembly, wherein the rear end cover assembly comprises a rear end cover body and a resistor assembly, the resistor assembly comprises a resistor cover, a resistor sheet and two inserting sheets, the two inserting sheets are connected to two ends of the resistor sheet, the direct current motor is characterized in that the resistor assembly further comprises an annular support and two annular insulating pads, the support is connected to the outer side of the rear end cover body, the resistor cover is annular, the edge of the resistor cover is connected with the edge of the support to form an annular cavity, the resistor sheet is of an annular structure formed by connecting a plurality of omega-shaped units, the two insulating pads are arranged on two sides of the resistor sheet to form a sandwich structure, and the sandwich structure is arranged in the annular cavity; the inserting sheet passes through the insulating pad, the support and the rear end cover body, and the rear end cover body is provided with fan-shaped reaming holes at corresponding positions of the inserting sheet.
The resistance sheet is arranged into an annular structure formed by connecting a plurality of omega-shaped units, and a larger radial space is reserved for the bearing chamber of the rear end cover. The resistor is a heating element, and the structural design has a larger space so as to facilitate the heat dissipation of the resistor, and the heat is gradually reduced in the air, so that the bearing chamber is in a safe state during working.
Preferably, the front end cover is provided with a waist-shaped vent hole. The kidney-shaped vent holes have a larger vent area than the circular vent holes.
Wherein, the assembly of front end cap, armature, stator and brush holder assembly can adopt current structure and assembly scheme.
In some preferred embodiments of the present invention, the brush holder assembly includes a brush basin bottom plate, an inductor, a capacitor, a socket and a brush assembly, the brush assembly is disposed in a diagonal area of the brush basin bottom plate, two opposite sides of the brush basin bottom plate are provided with notches, the inductor is disposed in the notches, the capacitor and the socket are disposed on the other two sides of the brush basin bottom plate, and the socket is connected with the insert sheet assembled by the rear end cover; the brush assembly comprises a carbon brush, a brush holder and a pressure spring, wherein the brush holder is fixed on a brush basin bottom plate, the carbon brush is slidably matched in the brush holder, the pressure spring is arranged inside the brush holder and connected with the inner end of the carbon brush, a plurality of sand discharge grooves are formed in the side face of the carbon brush, and the sand discharge grooves penetrate through the whole carbon brush.
The two sand discharge grooves can be formed, and a plurality of sand discharge grooves can be formed. The sand discharge groove can ensure that the carbon brush can stably slide in the brush holder under the condition that the electrified area of the carbon brush is basically unchanged, and meanwhile, mistakenly-entered sand and dust are discharged, so that the fine sand and dust are prevented from being blocked.
Furthermore, the two sand discharge grooves are respectively arranged at the middle positions of the upper side face and the lower side face of the carbon brush.
Further, two opposite clamping hooks are arranged on the bottom side of the brush holder. The clamping hooks are arranged so that the brush holder is conveniently clamped on the brush basin bottom plate.
Further, two notches of the brush basin bottom plate are respectively provided with an inductance fixing mechanism, the inductance fixing mechanism comprises a U-shaped elastic fixing piece and two positioning plates, the U-shaped elastic fixing piece is located at the middle position of the upper side of the notch, the opening end of the U-shaped elastic fixing piece is bent and connected with the brush basin bottom plate, the two positioning plates are respectively fixedly arranged at the lower sides of the two ends of the notch, and the tail ends of the U-shaped elastic fixing piece and the tail ends of the positioning plates are respectively provided with inverted buckles protruding inwards.
Further, each position of installing the electric capacity of brush basin bottom plate is equipped with electric capacity positioning mechanism respectively, electric capacity positioning mechanism includes electric capacity body recess, pin constant head tank and two pairs of spacing posts, the pin constant head tank is located electric capacity body recess both sides, pin constant head tank end is passed a pin welding hole that is equipped with on the brush basin bottom plate, spacing post is located terminal both sides of pin constant head tank are used for pressing from both sides tight electric capacity pin.
Furthermore, the capacitor body groove is in a shape like a Chinese character 'hui', one side is an elastomer, and the top end is provided with a stop hook.
Preferably, a lifting step is arranged at the position of the brush basin bottom plate where the socket is arranged. The axial dimensions of the inductor and the capacitor are fully utilized, the extra heights of the socket and the inserting sheet are solved through the staggered structure, and the total length of the motor is reduced. In addition, the grounding effective area can be increased at the two ends of the lifting ladder, and the electromagnetic anti-interference capability is improved.
In some preferred embodiments of the invention, in the armature, the iron core and the commutator are matched by adopting a deflection angle, and particularly, the center line of a punching tooth of the iron core is staggered from the center line of a commutator segment of the commutator by 4-6 degrees. The iron core and the commutator are staggered by adopting a deflection angle, so that the motor efficiency can be increased, and the motor commutation spark can be improved.
In some preferred embodiments of the invention, a partition plate is arranged between the positive and negative electrode brushes, the positive and negative electrode brush holders and the conducting strip to increase the creepage distance so as to improve the corrosion resistance; the connection part of the positive electrode lead-out wire and the conducting strip adopts a flow guiding structure to guide out corrosive liquid so as to reduce electrolytic corrosion.
The invention has the beneficial effects that:
(1) The invention optimizes the heating system and the heat dissipation system, and has better heat dissipation effect and higher reliability. The resistor disc is arranged into an annular structure formed by connecting a plurality of omega-shaped units, a larger radial space is reserved for the bearing chamber of the rear end cover, the resistor disc is a heating element, and the structural design has a larger space, so that the resistor disc can conveniently dissipate heat, and the heat is gradually reduced in the air, so that the bearing chamber is in a safe state during working. 2. The front end cover is provided with the kidney-shaped vent hole, and the rear end cover is provided with the fan-shaped reaming holes at the position of the inserting piece, so that the ventilation area is greatly increased, and the heat dissipation rate of the front end and the rear end of the motor is effectively improved. 3. The brush subassembly slope arranges in the brush holder assembly, and inductance, electric capacity etc. are arranged in the periphery, and is rationally distributed, solves traditional structure part many, carbon brush heat dissipation poor, carbon brush life-span short problem.
(2) The DC motor of the invention has improved environmental resistance. 1. The sand discharge groove penetrates through the whole carbon brush, so that the carbon brush can stably slide in the brush holder under the condition that the electrifying area of the carbon brush is basically unchanged, meanwhile, mistakenly-entered sand and dust are discharged, and the fine sand and dust are prevented from being blocked. 2. A partition plate is arranged between the positive and negative brushes and between the positive and negative brush holders and the conducting strip to increase the creepage distance so as to improve corrosion resistance; the connection part of the positive electrode lead-out wire and the conducting strip adopts a flow guiding structure to guide out corrosive liquid so as to reduce electrolytic corrosion.
(3) The brush holder assembly stability of the direct current motor is higher. 1. The notch of the brush basin bottom plate is provided with an inductance fixing mechanism, and the brush basin bottom plate is of an integrated structure and good in processing consistency. The inductor is assembled and limited through the inductor fixing mechanism, the inductor can be installed from the side face when being installed, the left end and the right end of the lower portion of the inductor can be limited by the locating plate, the upper portion of the inductor is fixed by the U-shaped elastic fixing piece, the U-shaped elastic fixing piece and the locating plate fix the circumferential direction of the inductor in an elastic mode, the tail end of the fixing piece is provided with the back-off, the inductor can be prevented from sliding out in the butt welding or transportation process, the positioning is accurate, the space for the retreating of the inductor body is reserved, the breakage phenomenon can be avoided when the inductor is assembled and welded, and the purpose of preventing scrapping without looseness is achieved. 2. The capacitor and the pins are assembled and limited through the capacitor positioning mechanism, the capacitor is clamped in the capacitor body groove and is clamped by the retaining hook, the pins are clamped in the pin positioning groove and are welded through the pin welding holes, and the pins are prevented from deforming and deviating in displacement. The capacitor and the pins can be processed on a full-automatic production line after being fixed.
(4) In the direct current motor, through the design of the stepped structure at the electric connection part, the axial dimension is fully utilized, the extra height of the socket and the inserting sheet can be solved through the staggered structure, and the total length of the motor is reduced. In addition, the grounding effective area can be increased at the two ends of the lifting ladder, and the electromagnetic anti-interference capability is improved.
Drawings
FIG. 1 is a schematic diagram of the back end of a conventional DC motor;
FIG. 2 is a schematic side view and partial cross-sectional view of a conventional DC motor;
FIG. 3 is a schematic view of a resistor disc assembled with a rear end cap of a conventional DC motor;
FIG. 4 is a schematic side view and partial cross-sectional view of a DC motor of the present invention;
FIG. 5 is a schematic view of the front end cover of the DC motor of the present invention;
fig. 6 is a schematic view of the offset angle assembly of the core and commutator of the dc motor of the present invention;
FIG. 7 is a schematic front view of the brush holder assembly of the present invention;
FIG. 8 is a schematic rear view of the brush holder assembly of the present invention;
FIG. 9 is an end schematic view of the brush assembly of the present disclosure;
FIG. 10 is a longitudinal cross-sectional view of the brush assembly of the present disclosure;
FIG. 11 is a perspective view of a brush basin bottom plate of the present invention;
FIG. 12 is a schematic top view of the brush basin bottom plate of the present invention;
FIG. 13 is a schematic bottom view of the brush basin bottom plate of the present invention;
FIG. 14 is a side view schematic of the brush basin bottom plate of the present invention;
FIG. 15 is an enlarged schematic view of a capacitive positioning mechanism of the brush basin bottom plate of the present invention;
FIG. 16 is a schematic view of the inside end face of the rear end cap assembly of the present invention;
FIG. 17 is a cross-sectional view of the rear end cap assembly of the present invention;
Fig. 18 is a schematic view of a rear end cap assembled resistor disc of the present invention.
Reference numerals
The prior art comprises the following steps: front end cover 11, armature 12, winding 121, insulating sleeve 122, iron core 123, shaft 124, commutator 125, stator 13, brush holder assembly 14, brush basin bottom plate 141, brush holder 142, carbon brush 143, pressure spring 144, rear end cover assembly 15, rear end cover 151, resistor 152, resistor cover 153, insulating pad 154;
The invention comprises the following steps:
a front end cover 21, a kidney-shaped vent hole 211;
armature 22, winding 221, insulating sleeve 222, core 223, segment teeth 2231, shaft 224, commutator 225, and segment 2251;
A stator 23;
Brush holder assembly 24, brush pot bottom plate 241, brush assembly 242, brush holder 2421, carbon brush 2422, sand drain 2422a, pressure spring 2423, inductor 243, capacitor 244, socket 245, inductor fixing mechanism 246, U-shaped elastic fixing piece 2461, positioning plate 2462, back-off 2461a/2462a; capacitor positioning mechanism 247, capacitor body groove 2471, pin positioning groove 2472, limit post 2473, pin welding hole 2474, lifting step 248;
Rear end cap assembly 25, rear end cap 251, resistor 252, resistor cap 253, insulating pad 254, insert 255, and annular bracket 256.
Detailed Description
The invention will be further illustrated with reference to specific examples. It should be understood that the following examples are illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1
Fig. 4 shows a dc motor according to a preferred embodiment of the present invention, which includes a front cover 21, an armature 22, a stator 23, a brush holder assembly 24, and a rear cover assembly 25.
The front cover 21 is provided with a kidney-shaped ventilation hole 211 as shown in fig. 5 to increase the ventilation area.
Armature 22 is comprised of windings 221, insulating sleeve 222, core 223, shaft 224, and commutator 225. The structure and assembly of the armature 22 and the stator 23 are basically the same as those of the armature 12 and the stator 13 in the existing direct current motor, and the difference is that, as shown in fig. 6, the iron core 223 and the commutator 225 are matched by adopting an offset angle, specifically, the center line of the punching sheet tooth 2231 of the iron core 223 is staggered by 4 degrees to 6 degrees with the center line of the commutator sheet 2251 of the commutator 225, and the motor efficiency can be increased and the motor commutation spark can be improved after the iron core and the commutator are staggered by adopting the offset angle.
The brush holder assembly 24, as shown in fig. 7 and 8, includes a brush basin bottom plate 241, a brush assembly 242, an inductance 243, a capacitance 244, and a socket 245. The brush assembly 242 is disposed in a diagonal area of the brush basin bottom plate 241, notches are provided on opposite sides of the brush basin bottom plate 241, the inductor 243 is disposed in the notches, the capacitor 244 and the socket 245 are disposed on the other two sides of the brush basin bottom plate 241, respectively, and the socket 245 is connected with the insert 255 of the rear end cap assembly 25. As shown in fig. 9 and 10, the brush assembly 242 includes a brush holder 2421, a carbon brush 2422 and a pressure spring 2423, the brush holder 2421 is fixed on the brush basin bottom plate 241, the carbon brush 2422 is slidably disposed in the brush holder 2421, the pressure spring 2423 is disposed inside the brush holder 2421 and connected to the inner end of the carbon brush 2422, a sand drain groove 2422a is disposed at the middle positions of the upper side and the lower side of the carbon brush 2422, respectively, and the sand drain groove 2422a penetrates through the entire carbon brush. The sand discharge groove 2422a can ensure that the carbon brush can stably slide in the brush holder under the condition that the electrifying area of the carbon brush is basically unchanged, and meanwhile, the erroneously-entered sand and dust are discharged, so that the tiny sand and dust are prevented from being blocked.
As shown in fig. 11 to 14, two notches of the brush basin bottom plate 241 for assembling the inductor 243 are respectively provided with an inductor fixing mechanism 246, the inductor fixing mechanism 246 comprises a U-shaped elastic fixing plate 2461 and two positioning plates 2462, the U-shaped elastic fixing plate 2461 is located at the middle position of the upper side of the notch, the opening end of the U-shaped elastic fixing plate is bent and connected with the brush basin bottom plate, the two positioning plates 2462 are respectively fixedly arranged at the lower sides of two ends of the notch, and the tail ends of the U-shaped elastic fixing plate 2461 and the positioning plates 2462 are respectively provided with inversed buckles 2461a and 2462a protruding inwards.
The side edges of the brush basin bottom plate 241 are respectively provided with a capacitor positioning mechanism 247 at each capacitor mounting position, and as shown in fig. 15, the capacitor positioning mechanism 247 comprises a capacitor body groove 2471, a pin positioning groove 2472 and a pair of limiting posts 2473. 2471 the capacitor body groove is shaped like a Chinese character 'hui', one side is an elastomer and the top end is provided with a stop hook 2471a. The pin positioning grooves 2472 are positioned on two sides of the capacitor body groove 2471, the tail ends of the pin positioning grooves 2472 penetrate through pin welding holes 2474 formed in the brush basin bottom plate, and the limiting posts 2473 are arranged on two sides of the tail ends of the pin positioning grooves 2472 and used for clamping capacitor pins.
Preferably, to fully utilize the axial dimension, the brush basin bottom plate 241 is provided with a lifting step 248 at the electrical connection (where the socket 245 and the positive and negative electrode bundles are arranged), a negative electrode bundle butt-joint area is above one end of the lifting step 248, and a socket and a positive electrode bundle butt-joint area is below the lifting step 248. According to the step-type structural design, the extra heights of the socket 245 and the inserting piece 255 are solved through the staggered structure, the extra height obtained by lifting the step 248 is controlled not to interfere with other parts in the safety range of motor assembly, the purpose of shortening the total length of the motor is achieved, and meanwhile, the step is lifted to serve as a partition plate, so that electric corrosion can be avoided. In addition, the two ends of the lifting step 248 can also increase the grounding effective area and improve the electromagnetic interference resistance.
Preferably, a partition 249 is arranged between the positive and negative brushes, the positive and negative brush holders and the conducting strip to increase the creepage distance so as to improve the corrosion resistance.
Preferably, the connection part of the positive electrode lead-out wire and the conducting strip adopts a diversion structure 2410 to lead out corrosive liquid so as to reduce electrolytic corrosion.
As shown in fig. 16 and 17, the rear end cap assembly 25 includes a rear end cap body 251 and a resistor assembly including a resistor sheet 252, a resistor cap 253, an insulating pad 254, a tab 255, and a ring support 256. The bracket 256 is connected to the outer side of the rear end cover body 251, the resistor cover 253 is annular, and a plurality of buckles for clamping the bracket 256 are arranged at intervals on the edge. The edge of the resistor cover 253 is connected with the edge of the bracket 256 to form an annular cavity. As shown in fig. 18, the resistor 252 has a ring-shaped structure formed by connecting a plurality of omega-shaped units, two insulating pads 254 are arranged on two sides of the resistor 252 to form a sandwich structure, and the sandwich structure is arranged in a ring-shaped cavity between the resistor cover 253 and the bracket 256. The insert 255 stands in a 90 degree bend and passes through the insulating pad 254, the bracket 256 and the rear end cap body 251 in sequence. The rear end cap body 251 is provided with a fan-shaped counterbore 2511 at the corresponding location of the insert.
The above embodiment can realize the following positive effects:
(1) The heating system and the heat dissipation system of the direct current engine are optimized, and the direct current engine has better heat dissipation effect and higher reliability. Specifically, the resistor 252 is arranged to be an annular structure formed by connecting a plurality of omega-shaped units, a larger radial space is reserved for the bearing chamber of the rear end cover 251, and the resistor is a heating element. 2. The front end cover 21 is provided with the waist-shaped vent hole 211, and the rear end cover is provided with a fan-shaped reaming hole at the position of the inserting piece, so that the ventilation area is greatly increased, and the heat dissipation rate of the front end and the rear end of the motor is effectively improved. 3. The brush subassembly slope arranges in the brush holder assembly, and inductance, electric capacity etc. are arranged in the periphery, and is rationally distributed, solves traditional structure part many, carbon brush heat dissipation poor, carbon brush life-span short problem.
(2) The environmental resistance of the direct current engine is improved. Specifically, in the single brush assembly 242, the sand discharge groove 2422a penetrates through the whole carbon brush 2422, so that the carbon brush can stably slide in the brush holder under the condition that the electrified area of the carbon brush is basically unchanged, meanwhile, the erroneously-entered sand and dust are discharged, and the fine sand and dust are prevented from being blocked. 2. A partition 249 is arranged between the positive and negative brushes and between the positive and negative brush holders and the conducting strip to increase the creepage distance so as to improve the corrosion resistance; the connection part of the positive electrode lead-out wire and the conducting strip adopts a diversion structure 2410 to lead out corrosive liquid so as to reduce electrolytic corrosion.
(3) The brush holder assembly stability of the DC motor is higher. Specifically, 1, an inductance fixing mechanism 246 is arranged in a notch of the brush basin bottom plate 241, and the brush basin bottom plate is of an integrated structure and has good processing consistency. The inductor 243 is assembled and limited through the inductor fixing mechanism 246, the inductor can be installed from the side face, the left end and the right end of the lower portion of the inductor can be limited by the locating plate, the upper portion of the inductor is fixed by the U-shaped elastic fixing piece, the U-shaped elastic fixing piece and the locating plate fix the circumferential direction of the inductor in an elastic mode, the tail end of the fixing piece is provided with a back-off, the inductor can be prevented from sliding out in the butt-welding or transportation process, the positioning is accurate, the space for the retreating of the inductor body is reserved, the breakage phenomenon can be avoided during assembly and welding, and the purpose of preventing scrapping without looseness is achieved. 2. The capacitor 244 and the pins are assembled and limited through the capacitor positioning mechanism 247, the capacitor is clamped in the capacitor body groove and is clamped by the retaining hook, the pins are clamped in the pin positioning grooves and are welded through the pin welding holes, and the pins are prevented from deforming and deviating in displacement. The capacitor and the pins can be processed on a full-automatic production line after being fixed.
(4) In the direct current motor of the invention, the design of the lifting step 248 at the electrical connection position fully utilizes the axial dimension, and the extra height of the socket 245 and the inserting sheet 255 can be solved by the staggered structure, thereby reducing the total length of the motor. In addition, the two ends of the lifting step 248 can also increase the grounding effective area and improve the electromagnetic interference resistance.
While the preferred embodiments of the present application have been illustrated and described, the present application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (7)
1. The direct current motor comprises a front end cover, an armature, a stator, a brush holder assembly and a rear end cover assembly, wherein the rear end cover assembly comprises a rear end cover body and a resistor assembly, the resistor assembly comprises a resistor cover, a resistor sheet and two inserting sheets, the two inserting sheets are connected to two ends of the resistor sheet, the direct current motor is characterized in that the resistor assembly further comprises an annular support and two annular insulating pads, the support is connected to the outer side of the rear end cover body, the resistor cover is annular, the edge of the resistor cover is connected with the edge of the support to form an annular cavity, the resistor sheet is of an annular structure formed by connecting a plurality of omega-shaped units, the two insulating pads are arranged on two sides of the resistor sheet to form a sandwich structure, and the sandwich structure is arranged in the annular cavity; the inserting sheet passes through the insulating pad, the bracket and the rear end cover body, and fan-shaped reaming holes are formed in the rear end cover body at corresponding positions of the inserting sheet;
the front end cover is provided with a waist-shaped vent hole;
The brush holder assembly comprises a brush basin bottom plate, an inductor, a capacitor, a socket and a brush assembly, wherein the brush assembly is arranged in a diagonal area of the brush basin bottom plate, notches are formed in two opposite sides of the brush basin bottom plate, the inductor is arranged in the notches, the capacitor and the socket are arranged on the other two sides of the brush basin bottom plate, and the socket is connected with an inserting sheet assembled by the rear end cover; the brush assembly comprises a carbon brush, a brush holder and a pressure spring, wherein the brush holder is fixed on a brush basin bottom plate, the carbon brush is slidably matched in the brush holder, the pressure spring is arranged inside the brush holder and connected with the inner end of the carbon brush, a plurality of sand discharge grooves are formed in the side face of the carbon brush, and the sand discharge grooves penetrate through the whole carbon brush.
2. The dc motor as set forth in claim 1, wherein the sand discharge groove is provided in two, respectively provided at intermediate positions of the upper side and the lower side of the carbon brush.
3. The direct current motor of claim 1, wherein two notches of the brush basin bottom plate are respectively provided with an inductance fixing mechanism, the inductance fixing mechanism comprises a U-shaped elastic fixing piece and two positioning plates, the U-shaped elastic fixing piece is positioned at the middle position of the upper side of the notch, the opening end of the U-shaped elastic fixing piece is bent and connected with the brush basin bottom plate, the two positioning plates are respectively fixedly arranged at the lower sides of two ends of the notch, and the tail ends of the U-shaped elastic fixing piece and the tail ends of the positioning plates are respectively provided with inverted buckles protruding inwards.
4. The direct current motor of claim 1, wherein each position of the brush basin bottom plate where the capacitor is mounted is provided with a capacitor positioning mechanism, the capacitor positioning mechanism comprises a capacitor body groove, a pin positioning groove and two pairs of limiting posts, the pin positioning groove is positioned at two sides of the capacitor body groove, the tail end of the pin positioning groove passes through a pin welding hole provided on the brush basin bottom plate, and the limiting posts are arranged at two sides of the tail end of the pin positioning groove and used for clamping capacitor pins.
5. The dc motor of claim 4 wherein the capacitor body recess is shaped like a Chinese character 'hui', having one side of an elastomer and a top end with a retaining hook.
6. The direct current motor of claim 4, wherein said brush basin floor is provided with a lifting step at the location where said socket is disposed.
7. The direct current motor according to claim 4, wherein in the armature, the iron core and the commutator are matched by adopting a deflection angle, and particularly, the center line of the punching teeth of the iron core is staggered from the center line of the commutating segments of the commutator by 4 degrees to 6 degrees.
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| CN201810349364.9A CN108512365B (en) | 2018-04-18 | 2018-04-18 | DC motor |
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| CN110474495B (en) * | 2019-09-24 | 2024-05-14 | 上海电气集团上海电机厂有限公司 | Vibration-proof arc-shaped top armature structure |
| CN114567108A (en) * | 2022-03-03 | 2022-05-31 | 上海电气集团上海电机厂有限公司 | Voltage-equalizing line arrangement structure of large-diameter rotor direct-current motor |
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| CN208272801U (en) * | 2018-04-18 | 2018-12-21 | 上海马陆日用友捷汽车电气有限公司 | A kind of dc motor |
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| SE8002541L (en) * | 1980-04-02 | 1981-10-03 | Bulten Kanthal Ab | DEVICE FOR PREPARATION OF ELECTRICAL RESISTANCE ELEMENTS |
| EP0436306A3 (en) * | 1989-12-06 | 1992-03-18 | Konica Corporation | Image forming apparatus |
| JPH11144576A (en) * | 1997-11-07 | 1999-05-28 | Toshiba Corp | Puffer type gas-blast circuit breaker with input resistor |
| JP5523966B2 (en) * | 2009-09-29 | 2014-06-18 | 株式会社東芝 | Rotating electric machine and coil |
| CN101764447A (en) * | 2009-11-27 | 2010-06-30 | 深圳创维－Rgb电子有限公司 | Flat DC motor |
| JP5899090B2 (en) * | 2012-09-14 | 2016-04-06 | 日立オートモティブシステムズステアリング株式会社 | Torque sensor |
| CN203103036U (en) * | 2013-01-14 | 2013-07-31 | 上海日用-友捷汽车电气有限公司 | External resistor |
| CN103212133B (en) * | 2013-04-10 | 2014-10-15 | 中国人民解放军第四军医大学 | Miniature portable multifunctional infusion device |
| DE202015001119U1 (en) * | 2015-02-12 | 2015-05-29 | Dynatron Corporation | Heat dissipation arrangement of the blower type with two diametrical air outlets |
| CN107809157B (en) * | 2016-09-09 | 2021-01-05 | 德昌电机(深圳)有限公司 | Electric power steering system and brush motor thereof |
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