CN210016370U - Anti-electromagnetic interference direct current motor - Google Patents

Anti-electromagnetic interference direct current motor Download PDF

Info

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
Authority
CN
China
Prior art keywords
commutator
rotating shaft
motor
electromagnetic interference
conductive gasket
Prior art date
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.)
Active
Application number
CN201920575270.3U
Other languages
Chinese (zh)
Inventor
吴倩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changzhou Fulin Zhongdian Intelligent Technology Co ltd
Original Assignee
CHANGZHOU FULLING PRODUCTS Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CHANGZHOU FULLING PRODUCTS Co Ltd filed Critical CHANGZHOU FULLING PRODUCTS Co Ltd
Priority to CN201920575270.3U priority Critical patent/CN210016370U/en
Application granted granted Critical
Publication of CN210016370U publication Critical patent/CN210016370U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Motor Or Generator Frames (AREA)

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

Anti-electromagnetic interference direct current motor
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.
CN201920575270.3U 2019-04-25 2019-04-25 Anti-electromagnetic interference direct current motor Active CN210016370U (en)

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)

Similar Documents

Publication Publication Date Title
CN107947492A (en) Eliminate the structure of motor shaft current
CN204538775U (en) A kind of waterproof power supply adaptor with USB interface
CN208955838U (en) A kind of shaft current elimination structure of permanent-magnet synchronous driving motor for electric vehicle
CN210016370U (en) Anti-electromagnetic interference direct current motor
CN207134917U (en) A kind of device for preventing shaft current damage bearing
CN106208174A (en) Waterproof power supply adaptor with USB interface
CN201590705U (en) Insulated bearing sleeve used for motor
CN105914933B (en) The safe side circuit sealing conducting ring device of fire-proof motor
CN201398130Y (en) Slip-ring device for alternating-current generator of motor vehicle
CN211605609U (en) Conductive slip ring
CN208782663U (en) Micro pump miniature DC motor
CN207926401U (en) A kind of DC motor structure
CN205356010U (en) Explosion -proof generator
CN204810073U (en) Prevent generator rotor of static corruption
CN205452045U (en) Capacitor
CN209642453U (en) Novel anti-carbon dust punctures after-poppet structure
CN205791946U (en) The motor improved structure of food waste processor
CN210928109U (en) Conductive brush applied to plasma equipment
CN207834214U (en) A kind of emergency-off device of miniature electric automobile
CN215897516U (en) Can restrain electromagnetic interference's commutator structure
CN219221264U (en) High-rotation-speed shaft current oil seal of new energy automobile motor
CN211175392U (en) Double-seal type sealing structure for annealing roller
CN204376153U (en) Device for transmitting rotary electric signal
CN219740095U (en) Motor capable of preventing shaft current from being generated
CN207612149U (en) A kind of motor end cover component of reinforced insulation

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