CN107681836A - A kind of motor for eliminating bearing galvano-cautery - Google Patents

A kind of motor for eliminating bearing galvano-cautery Download PDF

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Publication number
CN107681836A
CN107681836A CN201711188304.5A CN201711188304A CN107681836A CN 107681836 A CN107681836 A CN 107681836A CN 201711188304 A CN201711188304 A CN 201711188304A CN 107681836 A CN107681836 A CN 107681836A
Authority
CN
China
Prior art keywords
rotating shaft
end cap
thimble
cover plate
bearing
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.)
Pending
Application number
CN201711188304.5A
Other languages
Chinese (zh)
Inventor
刘蕾
何靖
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.)
Hefei JEE Power System Co Ltd
Original Assignee
Hefei JEE Power System 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 Hefei JEE Power System Co Ltd filed Critical Hefei JEE Power System Co Ltd
Priority to CN201711188304.5A priority Critical patent/CN107681836A/en
Publication of CN107681836A publication Critical patent/CN107681836A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/22Contacts for co-operating by abutting
    • H01R13/24Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2407Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
    • H01R13/2414Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means conductive elastomers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/22Contacts for co-operating by abutting
    • H01R13/24Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2407Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
    • H01R13/2421Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means using coil springs
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/22Contacts for co-operating by abutting
    • H01R13/24Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2442Contacts for co-operating by abutting resilient; resiliently-mounted with a single cantilevered beam
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/0094Structural association with other electrical or electronic devices
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00Connectors or connections adapted for particular applications
    • H01R2201/10Connectors or connections adapted for particular applications for dynamoelectric machines

Abstract

The invention discloses a kind of motor for eliminating bearing galvano-cautery, motor stator, rotor including housing and its inside, rotating shaft, housing both ends are separately installed with the first end cap and the second end cap, described rotating shaft one end passes the first end cap by clutch shaft bearing adaptation, the rotating shaft other end is adapted to by second bearing with the second end cap, the second end cap external stability has cover plate, the end face of the rotating shaft other end is also at electrical communication state by elastic parts and cover plate electrical communication, the cover plate and the second end cap with housing, the first end cap.The elastic parts includes thimble, spring and syringe, and the second end cap external stability has cover plate, and described syringe one end is fixed with cover plate, and spring is positioned in syringe, and thimble one end is stretched into syringe and touched with spring interface, and the thimble other end is in contact with rotating shaft end face.The present invention is versatile, installation is simple, cost is low, long lifespan, structure is reliable, maintenance cost is low.

Description

A kind of motor for eliminating bearing galvano-cautery
Technical field
The present invention relates to machine field, more particularly to a kind of motor for eliminating bearing galvano-cautery.
Background technology
It is no shaft voltage during the three phase electric machine operation of theoretical ideal balance.But due to electricity can not be made in the manufacturing Machine three-phase perfectly balances, can not be perfectly balanced between three-phase, so as to form alternating magnetic field in motor internal.Metal is in alternation magnetic Electromotive force will be produced in.The machine shaft of metal material will turn in the motor internal operating with alternating magnetic field Electromotive force is formed on axle.
Electromotive force in rotating shaft needs to form loop by conductor, and motor upper bearing (metal) just assume responsibility for the angle of conductor in loop Color.But conventional bearing is operationally, there is about 3 microns between bearing internal external circle and bearing roller(μm)Insulation oil film, cause turn Electric charge adds up on axle.Enough electric charges are accumulative to form sufficiently large electromotive force, and sufficiently large electromotive force can punctures 3 microns Insulation oil film.
This breakdown model punctures similar to electric capacity, and bearing roller and inside and outside raceway have respectively constituted the two poles of the earth of electric capacity.Root According to capacitance equation.Work as capacitance chargeWhen accumulating to a certain extent, the disruptive discharge timeIt is shorter, electric current caused by breakdown It is bigger.Breakdown current is big, the raceway position transient melting for causing bearing roller and roller contact to arrive, is rolled in bearing movable Son adhesion is carried away to raceway other positions, and then high-visible galvano-cautery lines is formd in raceway.
Solving bearing galvano-cautery has two kinds of theoretical schemes:A. the uneven magnetic field for producing shaft current is reduced, so as to reduce axle The generation of electric current;B. shaft current caused by not allowing passes through bearing.
Three kinds of methods below generally use avoid the generation of shaft current at present:I) magnet ring absorption pattern;Ii) bearing insulation side Formula;Iii) bearing internal external circle getting type.
Scheme i) is typically used in wind-powered electricity generation, in large scale industry motor.Scheme ii) there are ceramic insulation bearing, and patent document 《A kind of suppressing method of motor bearings shaft current》(Publication number:CN105811638A)In the bearing chamber interior insulation mentioned etc..Side Case iii) it is typically used in large scale industry brush motor.
There is not the bearing galvano-cautery removing method that can be applied in permagnetic synchronous motor also in the market, it may be considered that The method to be insulated using ceramic insulation bearing and bearing chamber is realized, but problems be present:
1. the price of ceramic insulation bearing is the decades of times of same specification plain bearing, cost is too high, far beyond products application The price that can be born.
2. patent document《A kind of suppressing method of motor bearings shaft current》(Publication number:CN105811638A)Middle (center) bearing Indoor insulating barrier requires that 0.4~0.6mm of plating Teflon coating is thick.A) with current common process coating generally only 0.02 ~ 0.1mm, realize that difficulty is big.B the bearing chamber fit precision for) assembling bearing requires H6, such as, thickness of coating 0.4 ~0.6mm, so high class fit can not be met, cause that bearing and bearing chamber fit clearance are excessive, and bearing is in high-speed cruising When skidded inside bearing chamber, can cause 1. bearing act as a travelling agent circle, service life reduction;The circle 2. bearing is acted as a travelling agent, scrape bearing chamber, coating Wipe off so as to fail.
The content of the invention
The present invention seeks to:A kind of motor for eliminating bearing galvano-cautery is provided, solves motor bearings by galvano-cautery risk Difficult with prior art commercial Application technique, application cost is high, the problems such as versatility is low, reaches and is easily realized in technique, multi-platform It is versatile.
It is of the invention to be from the theoretical scheme for solving galvano-cautery:Shaft current caused by not allowing is by bearing, so as to reach protection Bearing, avoid bearing galvano-cautery.
Bearing galvano-cautery has following 3 kinds of current loops.1) inside electric current is formed between machine shaft and housing by bearing Electric discharge;2) electric current is by forming ground connection electric discharge between housing and earth point;3) electric current is formed on bearing and sparked.
After all, bearing galvano-cautery is because electrical potential difference between rotating shaft and housing be present.If can be by between rotating shaft and housing Electrical potential difference eliminate can just avoid bearing galvano-cautery.The present invention connects the mechanical structure between rotating shaft and housing by particular design It is logical, reach the effect of equipotential between rotating shaft and housing, so as to eliminate the risk of bearing galvano-cautery.
The technical scheme is that:
A kind of motor for eliminating bearing galvano-cautery, including housing and its motor stator of inside, rotor, rotating shaft, housing two End is separately installed with the first end cap and the second end cap, and described rotating shaft one end passes the first end cap, rotating shaft by clutch shaft bearing adaptation The other end is adapted to by second bearing with the second end cap, and the second end cap external stability has cover plate, the rotating shaft other end End face is also at housing, the first end cap with the second end cap and electrically connect by elastic parts and cover plate electrical communication, the cover plate Logical state.
Preferably, the elastic parts includes thimble, spring and syringe, and the second end cap external stability has cover plate, institute State syringe one end to fix with cover plate, spring is positioned in syringe, and thimble one end is stretched into syringe and touched with spring interface, and thimble is another End is in contact with rotating shaft end face.
Preferably, the rotating shaft end face being in contact with thimble is provided with centre bore, and the thimble is inserted into roller end centre bore It is interior.
Preferably, the rotating shaft end face being in contact with thimble is machined with boss, and the thimble radially contacts with boss.
Preferably, the elastic parts includes a spring leaf, described spring leaf one end is in contact with cover plate, the other end with Rotating shaft end face is in contact.
Advantages of the present invention has:
It is 1. versatile.As long as rotating shaft can be with design centre hole, and shaft end has arrangement space, it is possible to uses.
2. installation is simple.Mechanism can be pre-installed on cover plate, then is installed with cover plate can.
3. cost is low.Part can be processed by standard component in motion mechanism, and the usual external diameter of motion thimble is not more than φ 5, always Cost is suitable with an equal amount of two bolt costs.
4. long lifespan.Thimble is contacted with the axle end center hole of rotating shaft, and the friction and wear between thimble and rotating shaft is reduced to It is minimum.
5. structure is reliable.Connected using spring, thimble position and compensation wear extent can be automatically adjusted so that thimble and rotating shaft All the time all in contact condition
6. maintenance cost is low.Even if changing thimble, also only need to tear cover plate open, without taking miscellaneous part apart again, it is possible to more Change, it is simple to operate.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment the invention will be further described:
Fig. 1 is the structural representation of the motor of the elimination bearing galvano-cautery of the embodiment of the present invention 1;
Fig. 2 is the structural representation of the elastic parts of embodiment 1;
Fig. 3 is the structural representation of the elastic parts of embodiment 2;
Fig. 4 is the structural representation of the elastic parts of embodiment 3.
Embodiment
Embodiment 1
As shown in figure 1, it is of the present invention eliminate bearing galvano-cautery motor, including housing 1 and its inside motor stator 6, Rotor 5, rotating shaft 3, housing both ends are separately installed with the first end cap 2 and the second end cap 7, and described one end of rotating shaft 3 passes through first The adaptation of bearing 4 passes the first end cap 2, and the other end of rotating shaft 3 is adapted to by second bearing 9 with the second end cap 7, second end cap 7 External stability has cover plate 8, and the end face of the rotating shaft other end passes through elastic parts 10 and the electrical communication of cover plate 8.
As described in Figure 2, the elastic parts 10 includes thimble 10-1, spring 10-2 and syringe 10-3, the syringe 10-3 One end is fixed with cover plate 8, and spring 10-2 is positioned in syringe 10-3, and thimble 10-1 is stretched into one end in syringe 10-3 and spring 10-2 It is in contact, the thimble 10-1 other ends are in contact with the end face of rotating shaft 3.The end face of rotating shaft 3 being in contact with thimble 10-1 is provided with centre bore, The thimble 10-1 is inserted into roller end centre bore.Rotating shaft 3 is electrically connect by thimble 10-1 through spring 10-2 and syringe 10-3 It is logical, syringe 10-3 and cover plate 8, the second end cap 7, housing 1, the first end cap 2 etc. all in electrical communication state, therefore rotating shaft 3 and Housing 1, the second end cap 7 and the first end cap 2 are also at electrical communication, have also just reached the effect of equipotential between rotating shaft 3 and housing 1 Fruit.
In the present embodiment, thimble 10-1 contacts with the centre bore of rotating shaft 3, because the linear velocity of shaft central hole is approximately equal to 0m/s, the friction and wear between thimble 10-1 and rotating shaft 3 is reduced to minimum.
In the present embodiment, using 10-2 springs come the contact between pretension thimble 10-1 and rotating shaft 3.One side different operating shape State lower rotary shaft temperature real-time change, the length of rotating shaft 3 also have minor variations, and spring 10-2 can adjust thimble 10-1 positions, So as to reach thimble 10-1 with rotating shaft 3 all the time all in contact condition.On the other hand, can be with when thimble 10-1 wears Thimble 10-1 length is compensated, so as to remain to make thimble 10-1 with rotating shaft 3 all the time all in contact condition.
Embodiment 2
As shown in figure 3, the elastic parts 10 of the present embodiment also includes thimble 10-1, spring 10-2 and syringe 10-3, with embodiment 1 Unlike, the rotating shaft end face being in contact with thimble 10-1 is machined with the boss 10-4 of minimum external diameter, the thimble and boss footpath To contact.
Embodiment 3
As shown in figure 3, the elastic parts 10 of the present embodiment uses a spring leaf 10-5, described spring leaf 10-5 one end and cover plate 8 are in contact, and the other end is in contact with the end face of rotating shaft 3.Angle α between spring leaf 10-5 and cover plate 8, after before cover plate is installed than installation Big, suitable with Examples 1 and 2 principle, spring leaf can equally adjust, and compensate the change of position.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Present disclosure can be understood and implemented according to this, it is not intended to limit the scope of the present invention.It is all main according to the present invention The modification for wanting the Spirit Essence of technical scheme to be done, it should all be included within the scope of the present invention.

Claims (5)

1. a kind of motor for eliminating bearing galvano-cautery, including housing and its motor stator of inside, rotor, rotating shaft, housing Both ends are separately installed with the first end cap and the second end cap, and described rotating shaft one end passes the first end cap by clutch shaft bearing adaptation, turned The axle other end is adapted to by second bearing with the second end cap, it is characterised in that:The second end cap external stability has cover plate, described The end face of the rotating shaft other end is by elastic parts and cover plate electrical communication, the cover plate and the second end cap and housing, the first end cap It is also at electrical communication state.
2. the motor according to claim 1 for eliminating bearing galvano-cautery, it is characterised in that:The elastic parts includes top Pin, spring and syringe, the second end cap external stability have cover plate, and described syringe one end is fixed with cover plate, and spring is positioned over pin In cylinder, thimble one end is stretched into syringe and touched with spring interface, and the thimble other end is in contact with rotating shaft end face.
3. the motor according to claim 2 for eliminating bearing galvano-cautery, it is characterised in that:The rotating shaft end being in contact with thimble Face is provided with centre bore, and the thimble is inserted into roller end centre bore.
4. the motor according to claim 2 for eliminating bearing galvano-cautery, it is characterised in that:The rotating shaft end being in contact with thimble Face is machined with boss, and the thimble radially contacts with boss.
5. the motor according to claim 1 for eliminating bearing galvano-cautery, it is characterised in that:The elastic parts includes one Spring leaf, described spring leaf one end is in contact with cover plate, the other end is in contact with rotating shaft end face.
CN201711188304.5A 2017-11-24 2017-11-24 A kind of motor for eliminating bearing galvano-cautery Pending CN107681836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711188304.5A CN107681836A (en) 2017-11-24 2017-11-24 A kind of motor for eliminating bearing galvano-cautery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711188304.5A CN107681836A (en) 2017-11-24 2017-11-24 A kind of motor for eliminating bearing galvano-cautery

Publications (1)

Publication Number Publication Date
CN107681836A true CN107681836A (en) 2018-02-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711188304.5A Pending CN107681836A (en) 2017-11-24 2017-11-24 A kind of motor for eliminating bearing galvano-cautery

Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109885881A (en) * 2019-01-18 2019-06-14 北京交通大学 A kind of determination method for the critical shaft current causing bearing galvano-cautery
CN110661359A (en) * 2019-09-30 2020-01-07 青岛铭振电子科技有限公司 Motor structure for reducing shaft current
CN112186975A (en) * 2019-07-02 2021-01-05 中车株洲电力机车研究所有限公司 Motor shaft current eliminating structure and motor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109885881A (en) * 2019-01-18 2019-06-14 北京交通大学 A kind of determination method for the critical shaft current causing bearing galvano-cautery
CN109885881B (en) * 2019-01-18 2020-10-09 北京交通大学 Method for determining critical shaft current causing bearing electric corrosion
CN112186975A (en) * 2019-07-02 2021-01-05 中车株洲电力机车研究所有限公司 Motor shaft current eliminating structure and motor
CN110661359A (en) * 2019-09-30 2020-01-07 青岛铭振电子科技有限公司 Motor structure for reducing shaft current

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