CN101272071A - Frequency conversion electric motor grounding device - Google Patents
Frequency conversion electric motor grounding device Download PDFInfo
- Publication number
- CN101272071A CN101272071A CNA2008100252755A CN200810025275A CN101272071A CN 101272071 A CN101272071 A CN 101272071A CN A2008100252755 A CNA2008100252755 A CN A2008100252755A CN 200810025275 A CN200810025275 A CN 200810025275A CN 101272071 A CN101272071 A CN 101272071A
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- China
- Prior art keywords
- brush holder
- bolt
- carbon brush
- bearing
- lead
- 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.)
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Abstract
The invention relates to a grounding device of a variable-frequency motor which belongs to a motor grounding device in particular. The device is characterized in that the device includes a bearing component, a carbon brush device, a brush frame cover and a rotary shaft; the rotary shaft is mounted in the brush frame cover and is supported by the bearing component; the carbon brush device is fixed on the bearing component through a bolt; the brush frame cover is fixed on the bearing component through a bolt; the carbon brush device includes a down-lead, a carbon brush frame, a bolt, black lead and a brush frame mounting plate; the carbon brush is fixed on the brush frame mounting plate through the bolt; the black lead is connected with the brush frame mounting plate; the down-lead is connected with the brush frame mounting plate through the bolt. The invention has a simple, compact and reasonable structure; the damage of a shaft circuit to the bearing and the rotary shaft can be great reduced; the service life of the motor can be prolonged, and the potential difference between the inner ring and the outer ring of the bearing can be removed.
Description
Technical field
The present invention relates to a kind of frequency conversion electric motor grounding device, specifically belong to the motor grounding apparatus.
Background technology
Along with ac speed control technology development is maked rapid progress, the price of frequency converter constantly reduces, and performance improves constantly, the application of alternating-current variable frequency motor more and more widely, the existing trend that replaces dc motor speed-regulating system of induction motor variable frequency speed regulation system.But meanwhile the variable-frequency motor shaft current causes the unusual problem of damaging of bearing also to be appeared suddenly day by day, and badly damaged machine shaft and bearing directly cause equipment fault, bring about great losses.At present, the measure of most of producers reply shaft current is the way that adopts insulation bearing, but insulation bearing leans on import basically, cost an arm and a leg, and procurement cycle is long, is unfavorable for producing, and has reduced production efficiency.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, thereby a kind of frequency conversion electric motor grounding device is provided, can reduce the damage of shaft current greatly, can prolong the useful life of motor, and can eliminate the potential difference between the bearing enclose bearing, rotating shaft.
Main solution of the present invention is achieved in that
Feature of the present invention is: comprise bearing assembly, carbon brush configuration, brush holder cover, rotating shaft, rotating shaft is installed in the brush holder cover, and by the bearing assembly supporting, carbon brush configuration and brush holder cover are respectively by being bolted on the bearing assembly.
Described carbon brush configuration comprises lead-in wire, carbon brush holder, bolt, graphite and brush holder mounting panel, and carbon brush holder is by being bolted on the brush holder mounting panel, and graphite links to each other with the brush holder mounting panel by lead-in wire, and lead-in wire links to each other with the brush holder mounting panel by bolt.
Compared with the prior art the present invention has the following advantages:
The present invention is simple, compact and reasonable for structure; Can reduce the damage of shaft current greatly, can prolong the useful life of motor, and can eliminate the potential difference between the bearing enclose bearing, rotating shaft.
Description of drawings
Fig. 1, Fig. 2 are structural representation of the present invention.
Fig. 3 is carbon brush configuration lead-in wire schematic diagram of the present invention.
Fig. 4 is a carbon brush configuration structural representation of the present invention.
Embodiment
Embodiment during following the present invention incites somebody to action in conjunction with the accompanying drawings is further described:
As Fig. 1～shown in Figure 3: comprise bearing assembly 1, carbon brush configuration 2, brush holder cover 3, rotating shaft 4, bolt 5, lead-in wire 6, carbon brush holder 7, bolt 8, graphite 9 and brush holder mounting panel 10 etc.
The present invention mainly comprises bearing assembly 1, carbon brush configuration 2, brush holder cover 3, rotating shaft 4, and rotating shaft 4 is installed in the brush holder cover 3, and by bearing assembly 1 supporting, carbon brush configuration 2 is fixed on the bearing assembly 1 by bolt 5, and brush holder cover 3 is by being bolted on the bearing assembly 1.
The course of work of the present invention: under the motor rotation situation, after shaft voltage forms, formed path between rotating shaft and the support, be between two bearings or fore bearing and earthing device of the present invention constitute the shaft current loop by support, the earth, eliminate the potential difference in the rotating shaft, because as long as shaft voltage is usually 8V～10V, so that the brush sectional area does not need is too big.
Operation principle of the present invention:
When motor moves, between the rotating shaft two ends or the potential difference between axle and the bearing be called shaft voltage, the axle two ends constitute the loop by support etc., then shaft voltage has formed shaft current.Under normal circumstances, shaft voltage is lower, and the lubricating oil film in the bearing can play insulating effect, can not produce shaft current, but when shaft voltage was higher, electric motor starting moment oil film is unstable to be formed, and shaft voltage will make the lubricating oil film discharge breakdown form the loop and produce shaft current.Two conditions that shaft current forms: the one, bearing inner race and bearing outer ring, bearing chamber, support form the loop of a closure; The 2nd, there is potential difference between bearing inner race and the outer ring, i.e. voltage.Above-mentioned two conditions just can not produce shaft current as long as one does not possess.The general motor of capacity about 100KW just is necessary to take measures to prevent shaft current.
Claims (2)
1, a kind of frequency conversion electric motor grounding device, comprise bearing assembly (1), carbon brush configuration (2), brush holder cover (3), rotating shaft (4), it is characterized in that: rotating shaft (4) is installed in the brush holder cover (3), by bearing assembly (1) supporting, carbon brush configuration (2) is separately fixed on the bearing assembly (1) with brush holder cover (3).
2, a kind of frequency conversion electric motor grounding device according to claim 1, it is characterized in that described carbon brush configuration (2) comprises lead-in wire (6), carbon brush holder (7), bolt (8), graphite (9) and brush holder mounting panel (10), carbon brush holder (7) is fixed on the brush holder mounting panel (10), graphite (9) links to each other with brush holder mounting panel (10) by lead-in wire (6), and lead-in wire (6) is connected with brush holder mounting panel (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100252755A CN101272071A (en) | 2008-04-30 | 2008-04-30 | Frequency conversion electric motor grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100252755A CN101272071A (en) | 2008-04-30 | 2008-04-30 | Frequency conversion electric motor grounding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101272071A true CN101272071A (en) | 2008-09-24 |
Family
ID=40005822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100252755A Pending CN101272071A (en) | 2008-04-30 | 2008-04-30 | Frequency conversion electric motor grounding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101272071A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917091A (en) * | 2010-06-21 | 2010-12-15 | 无锡哈电电机有限公司 | Grounding device of variable-frequency high-voltage motor |
| CN102842983A (en) * | 2012-09-29 | 2012-12-26 | 无锡市中达电机有限公司 | Grounding device of self-blowing air-cooled variable-frequency motor |
| CN104410199A (en) * | 2014-11-14 | 2015-03-11 | 江苏大中电机股份有限公司 | Intelligent frequency-converting control shaft current resistant small high-efficiency motor |
-
2008
- 2008-04-30 CN CNA2008100252755A patent/CN101272071A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917091A (en) * | 2010-06-21 | 2010-12-15 | 无锡哈电电机有限公司 | Grounding device of variable-frequency high-voltage motor |
| CN102842983A (en) * | 2012-09-29 | 2012-12-26 | 无锡市中达电机有限公司 | Grounding device of self-blowing air-cooled variable-frequency motor |
| CN104410199A (en) * | 2014-11-14 | 2015-03-11 | 江苏大中电机股份有限公司 | Intelligent frequency-converting control shaft current resistant small high-efficiency motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080924 |