CN202737713U - Brush-containing motor - Google Patents
Brush-containing motor Download PDFInfo
- Publication number
- CN202737713U CN202737713U CN 201220375619 CN201220375619U CN202737713U CN 202737713 U CN202737713 U CN 202737713U CN 201220375619 CN201220375619 CN 201220375619 CN 201220375619 U CN201220375619 U CN 201220375619U CN 202737713 U CN202737713 U CN 202737713U
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- Prior art keywords
- commutator
- brushing piece
- electromagnetic interference
- brush
- brush motor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Motor Or Generator Current Collectors (AREA)
Abstract
The utility model discloses a brush-containing motor which comprises a commutator and brush sheets. The commutator comprises a plurality of commutator segments distributed along circumferential directions. The brush sheets are made of an elastic conductive material and each brush sheet comprises a fixed end and a free end, wherein the fixed end is electrically connected to a direct-current power supply and the free end is used for slidably contacting with the commutator segments of the commutator. The free end of the brush sheet is provided with an electromagnetic interference suppression structure. The electromagnetic interference suppression structure may be an arc structure arranged at the free end of the brush sheet, and the arc structure is bent towards a direction deviating the commutator. The motor also comprises a pure capacitor filter circuit, and the filter circuit comprises a plurality of grounding capacitors. At least two grounding capacitors are arranged between each brush sheet and the ground. The motor adopts the electromagnetic interference suppression structure, so that uncontrollable electromagnetic interference can be effectively suppressed, and peaks/burrs in an electromagnetic interference waveform is obviously minimized/eliminated; and the filter circuit does not adopt magnetic beads, so that the production cost can be greatly reduced.
Description
Technical field
The utility model relates to a kind of brush motor, relates in particular to spark how to eliminate brush motor.
Background technology
Brush motor is a kind of converting electric energy to mechanical energy (motor) or mechanical energy being converted to the electric rotating machine of electric energy (generator) of brushgear that include.Thereby brush motor has the characteristics such as startup is fast, braking is timely, control circuit is relatively simple is used widely.
Brush motor is comprised of stator and rotor two large divisions, stator is established magnetic pole (winding type or magneto) and brush usually, the winding that rotor is usually established commutator and is electrically connected with the commutator segment of commutator, brush be electrically connected to power supply and with the commutator segment sliding contact of commutator to power to winding, after the winding energising, also form magnetic field (magnetic pole) on the rotor, an angle is arranged between the magnetic pole of stator and rotor, under the attracting each other in rotor magnetic field, make the rotor rotation.
In the brush motor of the use brushing piece of prior art, contact with the commutator segment of commutator with the contact jaw of guaranteeing brushing piece in order to produce precompression, brushing piece is made by having flexible electric conducting material usually.Yet, this kind brushing piece with commutator sliding contact process in easily produce vibrations, in the vibrations process, the contact jaw of brushing piece easily contacts (secondary commutation) with the commutator segment generation secondary of commutator, thereby produces uncontrollable electromagnetic interference.
But the utility model aims to provide the brush motor of the uncontrollable electromagnetic interference of a kind of establishment.
Summary of the invention
The utility model provides a kind of brush motor, comprise commutator and brushing piece, described commutator comprises the commutator segment that some edges circumferentially distribute, described brushing piece is made by having flexible electric conducting material, comprise the stiff end that is electrically connected to DC power supply and be used for free end with the commutator segment sliding contact of commutator, described brushing piece free end is provided with electromagnetic interference and suppresses structure.
Preferably, described electromagnetic interference suppresses structure and comprises and be arranged at the free-ended arcuate structure of brushing piece that described arcuate structure is crooked towards the direction away from commutator.
Preferably, the ratio of the radius of curvature of described arcuate structure and commutator radius greater than 0.2 less than 5.
Preferably, described electromagnetic interference suppresses structure and comprises and be arranged at the free-ended highly resistant material layer of brushing piece, described brushing piece free end comprise for the contact zone of commutator sliding contact, described high-resistance material layer is distributed in the contact zone periphery.
Preferably, described motor also comprises a filter circuit, and described filter circuit comprises some ground capacities, is provided with at least two ground capacities between each brushing piece and the ground.
Motor of the present utility model is owing to adopted electromagnetic interference to suppress structure, and uncontrollable electromagnetic interference is effectively suppressed, and the spike/burr in the electromagnetic interference waveform obviously reduces/eliminates; Filter circuit does not adopt magnetic bead, thereby can greatly reduce production costs.
In order further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, yet institute's accompanying drawing only provide with reference to and the explanation usefulness, the utility model is limited.
Description of drawings
Fig. 1 is the rough schematic view of the brush motor of the utility model one embodiment;
Fig. 2 be the utility model one embodiment brush motor reversing arrangement along its floor map of axially seeing;
Fig. 3 A be another embodiment of the utility model brush motor reversing arrangement along its floor map of axially seeing;
Fig. 3 B is the floor map of the brushing piece among Fig. 3 A;
Fig. 4 is the filter circuit figure of the brush motor of the utility model one embodiment;
Fig. 5 A and Fig. 5 B are respectively the electromagnetic interference waveform detection figure of the motor of motor of the present utility model and prior art.
Embodiment
Below in conjunction with accompanying drawing, by embodiment of the present utility model is described in detail, will make the technical solution of the utility model and other beneficial effects apparent.Be appreciated that accompanying drawing only provides reference and explanation usefulness, is limited the utility model.The size that shows in the accompanying drawing only is for ease of clear description, and does not limit proportionate relationship.
See also Fig. 1, brush motor of the present utility model comprises stator 1, rotor 2 and reversing arrangement.One of them establishes magnetic pole 3 stator 1 and rotor 2, the winding 4 that wherein another established commutator 10 and be electrically connected with the commutator segment of commutator, brush be electrically connected to power supply and with commutator segment 12 (the seeing Fig. 2) sliding contact of commutator 10 to power to winding, after winding 4 energisings, under the interaction in rotor magnetic field, the rotor rotation.
Fig. 2 be the utility model one embodiment brush motor reversing arrangement along its floor map of axially seeing.Described reversing arrangement comprises commutator 10 and is used for two brushing pieces 30 with commutator 10 sliding contacts.
Described commutator 10 comprises the commutator segment 12 that some edges circumferentially distribute.In the present embodiment, described commutator 10 is the column commutator, and commutator segment 12 is arranged at external cylindrical surface, and described brushing piece 30 is arranged at the peripheral two opposite sides of commutator 10, is used for and commutator segment 12 sliding contacts.
Described two brushing pieces 30 are connected to respectively the positive and negative terminal of DC power supply, and an end 32 of each brushing piece 30 is for stiff end and be connected to DC power supply, and the other end 34 is free end (also being contact jaw), can swing around stiff end 32.Described brushing piece 30 is made by having flexible electric conducting material such as beryllium copper.During work, described brushing piece 30 is under the elastic deformation, and the deformation force that strain produces impels brushing piece 30 free ends 34 to remain and commutator segment 12 sliding contacts.
In order to prevent in commutator 10 rotation processes, thereby the contact jaw of described brushing piece 30 34 is because vibrations and contact with commutator segment 12 secondary electrics and to produce uncontrollable electromagnetic interference, thereby described brushing piece 30 is provided with the electromagnetic interference inhibition structure that contact the uncontrollable electromagnetic interference of inhibition generation by suppressing brushing piece 30 with the secondary electric between the commutator segment 12.
See also Fig. 2, according to the utility model the first embodiment, it is the arcuate structure 36 that is arranged at brushing piece 30 free ends 34 that described electromagnetic interference suppresses structure, described arcuate structure 36 is towards the direction crooked (center of circle of arcuate structure 36 is away from commutator 10) away from commutator 10, thereby can increase in the described arcuate structure 36 distance of other parts and commutator 10 except normal contact zone (from nearest district, commutator center), thereby avoid in the commutation process because brushing piece 30 vibrations and contacting with commutator segment 12 secondary electrics.In theory, the radius of curvature of described arcuate structure 36 is the smaller the better, but considers the otherwise factors such as production, the preferable range of the radius of curvature of described arcuate structure 36 and the ratio of commutator 10 radiuses for greater than 0.2 less than 5.
See also Fig. 3 A and Fig. 3 B, according to the utility model the second embodiment, it is the high-resistance material layer 38 (comprising insulating material) that is arranged at close commutator segment 12 1 sides of brushing piece 30 free ends 34 that described electromagnetic interference suppresses structure, described brushing piece 30 free ends 34 comprise that one is used for the contact zone 35 with commutator 10 sliding contacts, high-resistance material layer 38 is distributed in contact zone 35 peripheries, and the resistance of high-resistance material layer 38 is 35 resistance much larger than the contact zone.The setting of high-resistance material layer 38 can reduce brushing piece because vibrations and so that the On current of the fringe area of contact zone 35 when contacting with commutator 10 secondaries, thereby plays the effect of the uncontrollable electromagnetic interference of inhibition.
Preferably, described brush motor also comprises a filter circuit, described filter circuit comprises some ground capacities 52, in the present embodiment, described brushing piece 30 comprises for the positive brushing piece 30a that links to each other with the positive pole of DC power supply and the negative brushing piece 30b that is used for linking to each other with the negative pole of DC power supply, be provided with two mutual ground capacities 52 in parallel between each brushing piece and the ground, be used for filtering common mode disturbances, in described two ground capacities 52 wherein the capacitance of an electric capacity be 1～100nF, the capacitance of another electric capacity is 10～100pF.Preferably, the capacitance of a described wherein electric capacity is 8～12nF, and the capacitance of another electric capacity is 65～70pF.In actual applications, each electric capacity only just has preferably filter effect under resonance frequency.The utility model arranges the ground capacity more than 1, so that described filter circuit has preferably filter effect under wider frequency.The filter circuit of the brush motor in the present embodiment adopts pure capacitance structure, adds the filter circuit that electric capacity consists of with respect to available technology adopting magnetic bead (bead), can greatly reduce cost.
Be appreciated that ground, also can establish plural ground capacity 52 between each brushing piece 30 and the ground.
Fig. 5 A and Fig. 5 B are respectively the electromagnetic interference waveform figure of the motor of motor of the present utility model and prior art.Motor of the present utility model shown in Fig. 5 A has adopted shown in Figure 2 with the brushing piece 30 of warp architecture 36 and filter circuit shown in Figure 4.The motor of the prior art shown in Fig. 5 B adopts with the straight brushing piece of warp architecture and conventional filter circuit (adopting magnetic bead to add electric capacity).Can find out from two figure contrast, both meet the requirements (level of noise is all below normal line), motor of the present utility model is owing to the brushing piece 30 that has adopted with warp architecture 36, and the spike/burr in the electromagnetic interference waveform obviously reduces/eliminates.
Be appreciated that ground, the free end 34 of described brushing piece 30 also can arrange arcuate structure 36 and high-resistance material layer 38 simultaneously.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. brush motor, comprise commutator and brushing piece, described commutator comprises the commutator segment that some edges circumferentially distribute, described brushing piece is made by having flexible electric conducting material, comprise the stiff end that is electrically connected to DC power supply and be used for free end with the commutator segment sliding contact of commutator, it is characterized in that: described brushing piece free end is provided with electromagnetic interference and suppresses structure.
2. brush motor according to claim 1 is characterized in that: described electromagnetic interference suppresses structure and comprises and be arranged at the free-ended arcuate structure of brushing piece that described arcuate structure is crooked towards the direction away from commutator.
3. brush motor according to claim 2 is characterized in that: the ratio of the radius of curvature of described arcuate structure and commutator radius greater than 0.2 less than 5.
4. brush motor according to claim 1, it is characterized in that: described electromagnetic interference suppresses structure and comprises and be arranged at the free-ended highly resistant material layer of brushing piece, described brushing piece free end comprise for the contact zone of commutator segment sliding contact, described high-resistance material layer is distributed in the contact zone periphery.
5. brush motor according to claim 2, it is characterized in that: described electromagnetic interference suppresses structure and also comprises and be arranged at the free-ended highly resistant material layer of brushing piece, described brushing piece free end comprise for the contact zone of commutator sliding contact, described high-resistance material layer is distributed in the contact zone periphery.
6. according to claim 1 to 5 each described brush motors, it is characterized in that: described motor also comprises a filter circuit, and described filter circuit comprises some ground capacities, is provided with at least two mutual ground capacities in parallel between each brushing piece and the ground.
7. brush motor according to claim 6, it is characterized in that: described filter circuit is pure capacitor filter.
8. brush motor according to claim 6 is characterized in that: in described at least two ground capacities wherein the capacitance of an electric capacity be 1～100nF, the capacitance of another electric capacity is 10～100pF.
9. brush motor according to claim 6 is characterized in that: the negative brushing piece that described brushing piece comprises for the positive brushing piece that links to each other with the positive pole of DC power supply and is used for linking to each other with the negative pole of DC power supply, establish line capacitance between described positive brushing piece and the negative brushing piece.
10. brush motor according to claim 6 is characterized in that: the capacitance 0.47～20uF of described line capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220375619 CN202737713U (en) | 2012-07-31 | 2012-07-31 | Brush-containing motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220375619 CN202737713U (en) | 2012-07-31 | 2012-07-31 | Brush-containing motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202737713U true CN202737713U (en) | 2013-02-13 |
Family
ID=47663372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220375619 Expired - Fee Related CN202737713U (en) | 2012-07-31 | 2012-07-31 | Brush-containing motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202737713U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580434A (en) * | 2012-07-31 | 2014-02-12 | 德昌电机(深圳)有限公司 | Brush-containing motor |
-
2012
- 2012-07-31 CN CN 201220375619 patent/CN202737713U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580434A (en) * | 2012-07-31 | 2014-02-12 | 德昌电机(深圳)有限公司 | Brush-containing motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170417 Address after: Baoan District Shenzhen City manhole street 518125 Guangdong province Shangliao community Xinsha road Dechang Motor Factory Patentee after: Guangdong Dechang Motor Co.,Ltd. Address before: Two new industrial village in Baoan District Shenzhen City manhole town of Guangdong Province in 518125 Patentee before: Johnson Electric (Shenzhen) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20200731 |