CN206698072U - A kind of variable-frequency motor for reducing shaft current - Google Patents
A kind of variable-frequency motor for reducing shaft current Download PDFInfo
- Publication number
- CN206698072U CN206698072U CN201720458961.6U CN201720458961U CN206698072U CN 206698072 U CN206698072 U CN 206698072U CN 201720458961 U CN201720458961 U CN 201720458961U CN 206698072 U CN206698072 U CN 206698072U
- Authority
- CN
- China
- Prior art keywords
- variable
- frequency motor
- shaft
- brush holder
- carbon brush
- 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.)
- Expired - Fee Related
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 6
- 125000006850 spacer group Chemical group 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
It the utility model is related to a kind of variable-frequency motor for reducing shaft current, belong to ground connection machine field, including variable-frequency motor and carbon brush holder, the center of variable-frequency motor is provided with machine shaft, machine shaft is located in bearing block and is fixed, carbon brush holder is provided with the outside of the axle stretch end of machine shaft, carbon brush holder is oppositely disposed at the both sides of the axle stretch end of variable-frequency motor, felt pad is provided with the bearing block of the non-shaft stretching end of variable-frequency motor.The utility model can not only guide the electrostatic charge on motor shaft into the earth by multigroup carbon brush holder, additionally it is possible to the loop of shaft current be cut off by the insulation spacer set up, so as to further reduce the possibility that shaft current phenomenon occurs.
Description
Technical field
A kind of variable-frequency motor for reducing shaft current is the utility model is related to, belongs to ground connection machine field.
Background technology
Variable-frequency motor refers under normal environment conditions, is connected with 100% nominal load in the range of 10%-100% normal speeds
Reforwarding row, motor of the temperature rise not over motor demarcation feasible value.Due to stator core combinated seam, stator silicon steel sheet seam,
Stator is uneven with rotor air gap, and axis center and magnetic field center are inconsistent etc., and the main shaft of unit is inevitably one
Rotated in the magnetic field of individual non complete symmetry.So, an alternating voltage will be produced at axle both ends and produces shaft current.Due to becoming
High-frequency harmonic electric current generates shaft current phenomenon on motor caused by frequency device, and corrugated trace is generated on race ring road
Mark, the normal operation of bearing being destroyed, raises bearing temperature, vibration increases, and the service life of bearing can greatly shorten, so as to
Maintenance of motor cost is added, shortens the service life of motor.
Chinese utility model patent ublic specification of application CN101272071A discloses a kind of frequency conversion electric motor grounding device,
Including bearing assembly, carbon brush configuration, brush holder cover, rotating shaft, rotating shaft is arranged in brush holder cover, supported by bearing assembly, carbon brush configuration
It is bolted on bearing assembly, brush holder cover is bolted on bearing assembly, and carbon brush configuration includes lead, carbon brush
Frame, bolt, graphite and brush holder installing plate, carbon brush holder are bolted on brush holder installing plate, and graphite passes through lead and brush holder
Installing plate is connected, and lead is connected by bolt with brush holder installing plate., can be big although the utility model is simple in construction, compact, reasonable
The big shaft current that reduces can extend the service life of motor, and can eliminate the electricity between bearing internal external circle to bearing, the damage of rotating shaft
Potential difference.But the system also has the following disadvantages：Although being mounted with that carbon brush holder can guide the electrostatic charge on motor shaft on the earth, from
And shaft current is eliminated, but the loop of shaft current is not cut off, variable-frequency motor is also possible that due to magnetic unbalance and produces axle
Electric current, so as to damage variable-frequency motor.
Utility model content
The utility model makes improvement for the above-mentioned problems of the prior art, i.e., technology to be solved in the utility model
Problem is to provide a kind of variable-frequency motor for reducing shaft current, can not only be drawn the electrostatic charge on motor shaft by multigroup carbon brush holder
To the earth, additionally it is possible to the loop of shaft current is cut off by the insulation spacer set up, is occurred so as to further reduce shaft current phenomenon
Possibility.
In order to solve the above technical problems, technical scheme is to provide a kind of change for reducing shaft current used by the utility model
Frequency motor, including variable-frequency motor and carbon brush holder, the center of the variable-frequency motor are provided with machine shaft, and the machine shaft is worn
It is fixed in bearing block, carbon brush holder is provided with the outside of the axle stretch end of the machine shaft, the carbon brush holder is oppositely disposed
Felt pad is installed in the both sides of the axle stretch end of the variable-frequency motor, the bearing block of the non-shaft stretching end of the variable-frequency motor.
Preferably, the material of the felt pad is rubber or plastics.
Preferably, the shell of the variable-frequency motor and ground insulation connection.
In a word, using a kind of variable-frequency motor for reducing shaft current of the present utility model, multigroup carbon brush holder can not only be passed through
Guide the electrostatic charge on motor shaft into the earth, additionally it is possible to the loop of shaft current is cut off by the insulation spacer set up, so as to enter one
Step reduces the possibility that shaft current phenomenon occurs.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples：
Fig. 1 is a kind of schematic diagram for the variable-frequency motor for reducing shaft current；
Fig. 2 is the schematic diagram between non-shaft stretching end and bearing block in a kind of variable-frequency motor for reducing shaft current.
Wherein, variable-frequency motor 1, carbon brush holder 2, machine shaft 3, bearing block 4, axle stretch end 5, non-shaft stretching end 6, felt pad 7.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with the accompanying drawings, but be not limited to model of the present utility model
Enclose.
As shown in Figure 1-2, the utility model provides a kind of variable-frequency motor for reducing shaft current, including variable-frequency motor 1 and carbon
Brush holder 2, the center of the variable-frequency motor 1 are provided with machine shaft 3, and the machine shaft 3 is located in bearing block 4 and is fixed,
The outside of the axle stretch end 5 of the machine shaft 3 is provided with carbon brush holder 2, and the carbon brush holder 2 is oppositely disposed at the variable-frequency motor
The both sides of 1 axle stretch end 5, felt pad 7, the felt pad 7 are installed in the bearing block 4 of the non-shaft stretching end 6 of the variable-frequency motor 1
Material be rubber or plastics, the shell of the variable-frequency motor 1 and ground insulation connection.
Working method：When variable-frequency motor 1 works, carbon brush holder 2 can be constantly by caused by the frequency converter in variable-frequency motor 1
Electric current guides the earth into so as to eliminate shaft current, and the felt pad 7 in the bearing block 4 of non-shaft stretching end 6 can also cut off shaft current
Loop, further reduce possibility caused by shaft current.
The beneficial effects of the utility model are：The electrostatic charge on motor shaft can not only be guided into greatly by multigroup carbon brush holder
Ground, additionally it is possible to the loop of shaft current is cut off by the insulation spacer set up, can so as to further reduce that shaft current phenomenon occurs
Can property.
Claims (3)
1. a kind of variable-frequency motor for reducing shaft current, including variable-frequency motor and carbon brush holder, it is characterised in that the variable-frequency motor
Center is provided with machine shaft, and the machine shaft is located in bearing block and is fixed, outside the axle stretch end of the machine shaft
Side is provided with carbon brush holder, and the carbon brush holder is oppositely disposed at the both sides of the axle stretch end of the variable-frequency motor, the variable-frequency motor
Non-shaft stretching end bearing block in felt pad is installed.
2. a kind of variable-frequency motor for reducing shaft current according to claim 1, it is characterised in that the material of the felt pad is
Rubber or plastics.
A kind of 3. variable-frequency motor for reducing shaft current according to claim 1, it is characterised in that the shell of the variable-frequency motor
Insulate and connect with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720458961.6U CN206698072U (en) | 2017-04-27 | 2017-04-27 | A kind of variable-frequency motor for reducing shaft current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720458961.6U CN206698072U (en) | 2017-04-27 | 2017-04-27 | A kind of variable-frequency motor for reducing shaft current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206698072U true CN206698072U (en) | 2017-12-01 |
Family
ID=60446865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720458961.6U Expired - Fee Related CN206698072U (en) | 2017-04-27 | 2017-04-27 | A kind of variable-frequency motor for reducing shaft current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206698072U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217223A (en) * | 2021-11-26 | 2022-03-22 | 佛山科学技术学院 | Test platform for simulating current damage of insulating bearing shaft of industrial variable frequency motor |
-
2017
- 2017-04-27 CN CN201720458961.6U patent/CN206698072U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217223A (en) * | 2021-11-26 | 2022-03-22 | 佛山科学技术学院 | Test platform for simulating current damage of insulating bearing shaft of industrial variable frequency motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171201 |