CN210016370U - Anti-electromagnetic interference direct current motor - Google Patents
Anti-electromagnetic interference direct current motor Download PDFInfo
- Publication number
- CN210016370U CN210016370U CN201920575270.3U CN201920575270U CN210016370U CN 210016370 U CN210016370 U CN 210016370U CN 201920575270 U CN201920575270 U CN 201920575270U CN 210016370 U CN210016370 U CN 210016370U
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- Prior art keywords
- commutator
- rotating shaft
- motor
- electromagnetic interference
- conductive gasket
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 230000000712 assembly Effects 0.000 claims abstract description 4
- 238000000429 assembly Methods 0.000 claims abstract description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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Abstract
The utility model relates to an anti-electromagnetic interference direct current motor, which comprises a motor shell, a stator component, a rotor component, an end cover component and a bearing component, wherein the rotor component comprises a rotor coil, a rotating shaft and a reversing device, the reversing device comprises a commutator and a carbon brush, and the commutator is sleeved on the rotating shaft; two ends of the rotating shaft are connected with the end cover assembly through bearing assemblies; the inner end of the commutator is connected with the rotor coil, and the commutator is provided with a positioning ring and a conductive gasket with high resistivity, wherein the positioning ring is in interference fit with the rotating shaft and promotes the end face of the outer end of the commutator to be in close contact with the conductive gasket. The utility model discloses its design through electrically conductive packing ring forms a shield in the motor, introduces the earth with the interference that the motor produced.
Description
Technical Field
The utility model belongs to the motor design field, concretely relates to direct current motor with anti-electromagnetic interference function.
Background
The common direct current motor inevitably generates commutation sparks during commutation, and the commutation sparks generate electromagnetic waves and generate electromagnetic interference to the outside.
At present, the methods for inhibiting the electromagnetic interference of the motor in the market mainly comprise two methods: a filter circuit and a parallel piezoresistor are added; however, both methods have certain limitations: the filter circuit of the motor is generally arranged in an end cover of the motor, is far away from an electromagnetic interference source (a commutator and an electric brush) of the motor, is difficult to fully absorb the electromagnetic interference, and is difficult to realize good inhibition effect on the electromagnetic interference of different frequency bands due to the limitation of the motor size, the motor cost, the motor application occasion and the like; the limitation of a filter circuit can be solved by the parallel piezoresistor, but the piezoresistor needs to be connected with a rectifier through soldering, so the scheme is not suitable for the environmental requirement of high temperature and high vibration, besides, the service temperature of the piezoresistor is limited at present, generally ranging from-40 ℃ to 125 ℃, and the use of the piezoresistor in the high-temperature environment is also limited.
Disclosure of Invention
In order to overcome the above-mentioned defect, the present invention provides an anti-electromagnetic interference dc motor, which forms a shielding body in the motor through the design of the conductive gasket, and introduces the interference generated by the motor into the ground.
In order to realize the purpose, the technical scheme of the utility model is that:
the direct current motor capable of resisting electromagnetic interference comprises a motor shell, a stator assembly, a rotor assembly, an end cover assembly and a bearing assembly, wherein the rotor assembly comprises a rotor coil, a rotating shaft and a reversing device, the reversing device comprises a commutator and a carbon brush, and the commutator is sleeved on the rotating shaft; two ends of the rotating shaft are connected with the end cover assembly through bearing assemblies; the inner end of the commutator is connected with the rotor coil, and the commutator is provided with a positioning ring and a conductive gasket with high resistivity, wherein the positioning ring is in interference fit with the rotating shaft and promotes the end face of the outer end of the commutator to be in close contact with the conductive gasket.
As a further improvement of the utility model: in order to reduce the loss of the motor and improve the electromagnetic wave absorption effect, the conductive gasket is made of conductive rubber or conductive plastic, and the volume resistivity of the conductive gasket is 500-1000 omega-m.
As a further improvement of the utility model: and a tin layer is arranged on the end surface of the outer end of the commutator, which is contacted with the conductive gasket, so that the contact reliability of the commutator and the conductive gasket is ensured.
When a common direct current motor commutates, the current in the armature element changes suddenly, and commutation sparks are generated between the commutator and the carbon brush, which is the main reason why the direct current motor generates electromagnetic interference to the outside. The utility model discloses a shield of the inside formation of motor of design of conductive gasket, establish a continuous electrically conductive passageway between motor commutator and the ground, introduce the ground with the electromagnetic interference of motor.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a commutator design;
fig. 3 is an equivalent circuit diagram formed in fig. 2.
Detailed Description
In order to further the understanding of the present invention, the following detailed description will be given with reference to the embodiments.
Example, as shown in fig. 1: the utility model relates to an anti-electromagnetic interference direct current motor, which comprises a motor shell 1, a stator component, a rotor component, an end cover component and a bearing component; the rotor assembly comprises a rotor coil, a rotating shaft 2 and a reversing device, the reversing device comprises a commutator 32 and a carbon brush 31, and the commutator 32 is sleeved on the rotating shaft 2; two ends of the rotating shaft 2 are connected with the end cover assembly through bearing assemblies; the inner end of the commutator 32 is connected to the rotor coil.
As shown in fig. 2: and a positioning ring 6 and a conductive gasket 5 with high resistivity are arranged, wherein the positioning ring 6 is in interference fit with the rotating shaft 2 and promotes the end face of the outer end of the commutator to be in close contact with the conductive gasket 5. In order to ensure the contact reliability, a tin layer is arranged on the end face of the outer end of the commutator 32.
In this embodiment, the conductive gasket 5 is made of conductive rubber and has a volume resistivity of 700 Ω · m.
The conductivity and the use temperature of the conductive rubber in the embodiment can be set according to the use requirement, and the use range is wide.
The working principle of the embodiment is as follows: as shown in fig. 1, a conductive gasket 5 is added between a commutator 32 of a motor and a rotating shaft 2, the conductive gasket 5 transfers interference generated on the commutator 32 to the rotating shaft 2, the rotating shaft 2 is connected with the ground through a bearing 4, a bearing seat and a shell 1, and the rotating shaft, the bearing seat, a shell and the like are all made of conductive materials, so that a continuous conductive channel between the commutator and the ground is established, and the interference on the commutator can be introduced into the ground along the channel, thereby reducing the interference to the outside.
The utility model discloses an increase electrically conductive packing ring, the electromagnetic interference who produces when consuming the absorption motor switching-over. As shown in fig. 3: the working principle of the present invention is further illustrated by an equivalent circuit diagram of the connection of a single winding of the motor and the conductive washer, as follows:
in fig. 3: u is the voltage at two ends of the motor; s represents the on-off between the commutator and the electric brush; rm1 represents the winding resistance; lm1 represents winding inductance; rc represents the conductive gasket resistance; r is the internal resistance of the motor.
When S is switched on, current flows into two branches of a motor winding and a conductive gasket, at the moment, the motor current I = I1+ I2, only I1 does work, and in order to reduce motor loss, the resistance Rc of the conductive gasket needs to be designed to be far larger than the resistance Rm1 of the winding, so that the conductive gasket needs to be made of a material with higher resistivity.
At the moment of S disconnection, the stored energy in Lm1 needs to be released, if the resistor Rc and Lm1 are not connected in parallel, the energy in the Lm1 is released into the air to generate interference, and when the resistor Rc and Lm1 are connected in parallel, the energy in the Lm1 is consumed by Rc, so that the electromagnetic interference generated to the outside is reduced.
The utility model discloses structural design is ingenious, simple process, and the practicality is strong, can effectively reduce the electromagnetic interference of motor.
The above embodiments are only used for explaining the present invention, and do not constitute a limitation to the scope of the present invention.
Claims (3)
1. The direct current motor capable of resisting electromagnetic interference comprises a motor shell, a stator assembly, a rotor assembly, an end cover assembly and a bearing assembly, wherein the rotor assembly comprises a rotor coil, a rotating shaft and a reversing device, the reversing device comprises a commutator and a carbon brush, and the commutator is sleeved on the rotating shaft; two ends of the rotating shaft are connected with the end cover assembly through bearing assemblies; the inner end of the commutator is connected with the rotor coil, and the commutator is characterized in that: the commutator is provided with a positioning ring and a conductive gasket with high resistivity, wherein the positioning ring is in interference fit with the rotating shaft and promotes the end face of the outer end of the commutator to be in close contact with the conductive gasket.
2. The anti-electromagnetic interference direct current motor according to claim 1, characterized in that: the conductive gasket is made of conductive rubber or conductive plastic, and the volume resistivity of the conductive gasket is 500-1000 omega-m.
3. The anti-electromagnetic interference direct current motor according to claim 1, characterized in that: and a tin layer is arranged on the end surface of the outer end of the commutator, which is contacted with the conductive gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920575270.3U CN210016370U (en) | 2019-04-25 | 2019-04-25 | Anti-electromagnetic interference direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920575270.3U CN210016370U (en) | 2019-04-25 | 2019-04-25 | Anti-electromagnetic interference direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210016370U true CN210016370U (en) | 2020-02-04 |
Family
ID=69315844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920575270.3U Active CN210016370U (en) | 2019-04-25 | 2019-04-25 | Anti-electromagnetic interference direct current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210016370U (en) |
-
2019
- 2019-04-25 CN CN201920575270.3U patent/CN210016370U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230111 Address after: 213125 No. 8, Kunlun Road, Xinbei District, Changzhou City, Jiangsu Province Patentee after: FULLING & CEIEC Co.,Ltd. Address before: 213125 No. 7, Kunlun Road, Sanjing Industrial Park, Xinbei District, Changzhou City, Jiangsu Province Patentee before: FULLING PRODUCTS Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 213125 No. 8, Kunlun Road, Xinbei District, Changzhou City, Jiangsu Province Patentee after: Changzhou Fulin Zhongdian Intelligent Technology Co.,Ltd. Country or region after: China Address before: 213125 No. 8, Kunlun Road, Xinbei District, Changzhou City, Jiangsu Province Patentee before: FULLING & CEIEC Co.,Ltd. Country or region before: China |