CN103580390A - Ground connection structure for reducing shaft voltage of double-fed wind generator - Google Patents
Ground connection structure for reducing shaft voltage of double-fed wind generator Download PDFInfo
- Publication number
- CN103580390A CN103580390A CN201310568141.9A CN201310568141A CN103580390A CN 103580390 A CN103580390 A CN 103580390A CN 201310568141 A CN201310568141 A CN 201310568141A CN 103580390 A CN103580390 A CN 103580390A
- Authority
- CN
- China
- Prior art keywords
- shaft
- carbon brush
- ground connection
- connection structure
- double
- 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
Links
Images
Landscapes
- Wind Motors (AREA)
Abstract
The invention relates to a motor ground connection structure, in particular to a ground connection structure for reducing the shaft voltage of a double-fed wind generator, and belongs to the technical field of wind generators. The ground connection structure comprises a shaft extension terminating shaft carbon brush, a machine base outer shell and a non-shaft extension terminating shaft carbon brush all of which are sequentially connected through an electric connecting line. The ground connection structure is low in cost, reasonable in structure and obvious in effect, a method for reducing the shaft voltage is added, the ground connection structure is suitable for being applied in a wind power system with requirements for zero maintenance and high reliability, and the reliability of wind electricity operation is improved.
Description
Technical field
The present invention relates to a kind of motor ground structure, a kind of ground structure that reduces shaft voltage for double-fed wind power generator, belongs to technical field of wind power generator specifically.
Background technology
Generating set is in operation, because magnetic flux imbalance causes rotor axial induction shaft electromotive force, this magnetic flux imbalance be due to stator and rotor airgap inhomogeneous, the local magnetic conduction of stator core bad (engaging bad when the corrosion of iron core, the assembling of distinguish iron core), the reason such as armature reaction is inhomogeneous causes.Axle electromotive force will form closed-loop path along armature spindle, bearing, support, because loop resistance is very little, although shaft voltage is not high, be enough to puncture the oil film between axle and bearing, discharge, and sometimes reach hundreds of peaces.Shaft current can make the grease of lubrication deteriorated gradually, and produces point-like micropore at bearing shell and bearing place, even burns out tiling, may cause the damage of axle journal and bearing when serious, by forced-stopping machine, is caused the accident.
Therefore general generator, when design and installation, adopts the shaft current of following two kinds of means prevention generator conventionally: the one, reduce shaft voltage, and change Frequency Converter Control parameter or control mode; The 2nd, reduce shaft current, as strengthened bearing insulation and increasing pedestal bearing insulation, even if there is larger axis voltage, can not form large shaft current yet.
After the nineties in last century, the PWM inverter that the IGBT of usining is power device is during as motor drive power supply, and motor shaft current problems is more serious, and the mechanism producing is completely different with sine-wave power driving.For wind-driven generator, the electric current that high fdrequency component produces combines and does the used time, will make shaft current greatly increase, thereby accelerates the damage of bearing.To this, can adopt at inverter output end filter is set, to suppress the quick variation of electric current and to absorb the high order harmonic component in output voltage, reach the object that suppresses shaft current.But the cost of this way is that the power loss of reactor is large, and volume is large, and cost is high, in common frequency conversion speed-adjusting system, application is not very suitable.
In addition, in order to eliminate shaft voltage, through bearing, support and armature spindle etc., locate to form current circuit, prevent that shaft current from burning bearing, can, by bearing pedestal insulation against ground, even adopt insulation bearing.This method is except cost is high, also easily in actual motion, cause inefficacy: it is destroyed that one, insulation bearing easily causes insulating barrier in transportation, assembling and running, two, due to the oil fuel tube on bearing end cover (being connected with bearing), insulating barrier and the end cap of easily walking around bearing pedestal directly touch and ground connection.
For having, zero dimension is protected, the wind power system of high reliability request, only relies on above tradition to reduce shaft voltage structure not enough gradually.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point, thereby provide a kind of ground structure that reduces shaft voltage for double-fed wind power generator, for wind-driven generator reduces shaft voltage, provide a kind of method more, can increase assurance coefficient for the reliability service of wind-driven generator.
According to technical scheme provided by the invention, a kind of ground structure that reduces shaft voltage for double-fed wind power generator comprises shaft extension abutting shaft carbon brush, support shell and non-shaft stretching end spindle carbon brush, shaft extension abutting shaft carbon brush is arranged on generator shaft extension end, non-shaft stretching end spindle carbon brush is arranged on generator non-shaft stretching end, it is characterized in that: described in stretch abutting shaft carbon brush, support shell and non-shaft stretching end spindle carbon brush and be connected successively by electrical cable.
Preferably, support shell is fixed on Motor Foundation.
Preferably, electrical cable with stretch abutting shaft carbon brush, support shell and non-shaft stretching end spindle carbon brush by conduction metal bolts be connected.
Compared with the prior art the present invention has the following advantages:
The present invention is with low cost, rational in infrastructure, and action effect is obvious, has increased a kind of method that reduces shaft voltage, is applicable to being used in having that zero dimension is protected, in the wind power system of high reliability request, having increased wind-powered electricity generation reliability of operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Description of reference numerals: 1-non-shaft stretching end spindle carbon brush, 2-support shell, 3-shaft extension abutting shaft carbon brush, 4-Motor Foundation, 5-electrical cable.
Embodiment
The present invention is below further described in connection with the embodiment in accompanying drawing:
As shown in Figure 1, the present invention mainly comprises shaft extension abutting shaft carbon brush 3, support shell 2 and non-shaft stretching end spindle carbon brush 1, and shaft extension abutting shaft carbon brush 3 is arranged on generator shaft extension end, and non-shaft stretching end spindle carbon brush 1 is arranged on generator non-shaft stretching end.Support shell 2 is fixed on Motor Foundation 4.
Described abutting shaft carbon brush 3, support shell 2 and the non-shaft stretching end spindle carbon brush 1 stretched is connected successively by electrical cable 5, makes it to keep zero potential simultaneously, can not form current circuit, thereby avoided the generation of shaft current.
Described electrical cable 5 with stretch abutting shaft carbon brush 3, support shell 2 and non-shaft stretching end spindle carbon brush 1 by conduction metal bolts be connected.
The present invention is with low cost, rational in infrastructure, and action effect is obvious, has increased a kind of method that reduces shaft voltage, is applicable to being used in having that zero dimension is protected, in the wind power system of high reliability request, having increased wind-powered electricity generation reliability of operation.
Above-described is only the preferred embodiment of the present invention, and the present invention is not limited only to above examples of implementation.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate without departing from the spirit and concept in the present invention, within all should thinking and being included in protection scope of the present invention.
Claims (3)
1. a ground structure that reduces shaft voltage for double-fed wind power generator, comprise shaft extension abutting shaft carbon brush (3), support shell (2) and non-shaft stretching end spindle carbon brush (1), shaft extension abutting shaft carbon brush (3) is arranged on generator shaft extension end, non-shaft stretching end spindle carbon brush (1) is arranged on generator non-shaft stretching end, it is characterized in that: described in stretch abutting shaft carbon brush (3), support shell (2) and non-shaft stretching end spindle carbon brush (1) and be connected successively by electrical cable (5).
2. a kind of ground structure that reduces shaft voltage for double-fed wind power generator as claimed in claim 1, is characterized in that: described support shell (2) is fixed on Motor Foundation (4).
3. a kind of ground structure that reduces shaft voltage for double-fed wind power generator as claimed in claim 1, is characterized in that: described electrical cable (5) with stretch abutting shaft carbon brush (3), support shell (2) and non-shaft stretching end spindle carbon brush (1) metal bolts by conduction and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310568141.9A CN103580390A (en) | 2013-11-13 | 2013-11-13 | Ground connection structure for reducing shaft voltage of double-fed wind generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310568141.9A CN103580390A (en) | 2013-11-13 | 2013-11-13 | Ground connection structure for reducing shaft voltage of double-fed wind generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103580390A true CN103580390A (en) | 2014-02-12 |
Family
ID=50051531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310568141.9A Pending CN103580390A (en) | 2013-11-13 | 2013-11-13 | Ground connection structure for reducing shaft voltage of double-fed wind generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103580390A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937964A (en) * | 2021-10-12 | 2022-01-14 | 江苏安方电力科技有限公司 | Integrated grounding device based on hollow outer rotor driving climbing motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1111758A1 (en) * | 1999-12-24 | 2001-06-27 | Valeo Auto-Electric Wischer und Motoren GmbH | Gear motor, in particularly wiper motor for motor vehicles |
| CN201226470Y (en) * | 2008-06-04 | 2009-04-22 | 天津神川机电有限公司 | High-power variable-frequency control three-phase asynchronous motor with grounding carbon brush |
| CN201752092U (en) * | 2010-06-29 | 2011-02-23 | 江西泰豪特种电机有限公司 | Grounding carbon brush device of electric generator |
-
2013
- 2013-11-13 CN CN201310568141.9A patent/CN103580390A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1111758A1 (en) * | 1999-12-24 | 2001-06-27 | Valeo Auto-Electric Wischer und Motoren GmbH | Gear motor, in particularly wiper motor for motor vehicles |
| CN201226470Y (en) * | 2008-06-04 | 2009-04-22 | 天津神川机电有限公司 | High-power variable-frequency control three-phase asynchronous motor with grounding carbon brush |
| CN201752092U (en) * | 2010-06-29 | 2011-02-23 | 江西泰豪特种电机有限公司 | Grounding carbon brush device of electric generator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937964A (en) * | 2021-10-12 | 2022-01-14 | 江苏安方电力科技有限公司 | Integrated grounding device based on hollow outer rotor driving climbing motor |
| CN113937964B (en) * | 2021-10-12 | 2023-08-01 | 江苏安方电力科技有限公司 | Integrated grounding device based on hollow outer rotor driving climbing motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103178668B (en) | Radial magnetic field double-stator vernier motor | |
| US20110140430A1 (en) | Method and System for Providing Increased Turbine Output for Doubly Fed Induction Generator | |
| CN202488301U (en) | Double-air-gap mixed-excitation direct-driving switch magnetic-resistance wind-driven-generator and generator system thereof | |
| CN103178667B (en) | Axial-magnetic-fielddouble-stator double-stator vernier motor | |
| CN102594062A (en) | Double-air-gap hybrid-excitation direct-drive switch-reluctance wind generator and wind generator set system | |
| CN102290937A (en) | Large direct-drive double-stator switched reluctance wind driven generator supported by double bearings | |
| CN201786562U (en) | Dual-stator direct drive permanent magnet wind-driven generator | |
| Abdi et al. | Design and performance analysis of a 6 MW medium-speed brushless DFIG | |
| Lin et al. | Self-excited synchronous machine using airgap harmonics | |
| CN204156697U (en) | A kind of direct-drive permanent magnet wind power generator of bimorph transducer split-type structure | |
| US8829755B2 (en) | Composite permanent magnet synchronous machine | |
| CN103580390A (en) | Ground connection structure for reducing shaft voltage of double-fed wind generator | |
| CN101615829A (en) | A kind of stator-free double-rotor reverse rotating generator | |
| CN204408111U (en) | The DC frequency-changing motor that a kind of hybrid vehicle is special | |
| CN101557132B (en) | Salient pole synchronous motor rotor intermagnetic pole bracing structure | |
| CN207766040U (en) | A kind of generator | |
| CN201928150U (en) | Double-fed wind driven generator slip ring grounding system | |
| Samoylenko et al. | Semiconductor power electronics for synchronous distributed generation | |
| CN202145609U (en) | Double-bearing supported large-scale directly-driven double-stator switch magnetic resistance wind driven generator | |
| Song et al. | High voltage ride-through control method for DFIG-based wind turbines based on Resonant Controller | |
| CN104153943A (en) | Wind power system based on coaxial hybrid generators | |
| CN103023243A (en) | Double-air-gap hybrid excitation direct drive switched reluctance wind power generator and unit system thereof | |
| CN202586690U (en) | DC excitation synchronous wind-driven generator | |
| CN102882333A (en) | Combined three-phase asynchronous motor | |
| CN201789398U (en) | High-voltage permanent-magnet brushless-DC constant-voltage wind driven generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140212 |