CN202550772U - End cap structure for preventing shaft currents - Google Patents
End cap structure for preventing shaft currents Download PDFInfo
- Publication number
- CN202550772U CN202550772U CN2012201702879U CN201220170287U CN202550772U CN 202550772 U CN202550772 U CN 202550772U CN 2012201702879 U CN2012201702879 U CN 2012201702879U CN 201220170287 U CN201220170287 U CN 201220170287U CN 202550772 U CN202550772 U CN 202550772U
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- bearing
- end cap
- cover
- cap
- face
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Abstract
The utility model discloses an end cap structure for preventing shaft currents. The end cap structure comprises a bearing mounted on a motor shaft, an inner bearing cap located inside the bearing and a motor end cap located outside the bearing. A first bearing sleeve is disposed between the motor end cap and an outer bearing ring. A second bearing sleeve is disposed between end faces, relative to the inner bearing cap, of the inner bearing cap and the outer bearing ring. An insulation protecting layer is disposed on an end face, contacting with the motor end cap, of the first bearing sleeve. Another insulation protecting layer is also disposed on an end face, contacting with the inner bearing cap, of the second bearing sleeve. The insulation protecting layers are made by enamel process, and the insulation protecting layers are 0.5-1mm in thickness. Shaft currents are prevented effectively, the bearing is protected, service life of the bearing is prolonged, and the end cap structure has the advantages of simple structure, high reliability and low price.
Description
Technical field
The utility model relates to a kind of electric machine structure, a kind of specifically end cover structure that is particularly useful for the anti-shaft current of PWM variable-frequency motor.
Background technology
Motor is in operation, and reason can produce shaft current owing to the magnetic field air gap is inhomogeneous etc.Shaft current is transferred to electric motor end cap by machine shaft through bearing, forms path.Shaft current can produce galvano-cautery on the rolling element of bearing surface and raceway, can on the raceway of bearing, formation have a strong impact on the life-span of bearing as the evidence of corrosion of washboard shape.At present,, adopt isolation bearing usually, with the means of the passage that cuts off electric current in order to prevent the corrosion of shaft current to bearing.
Method commonly used has following two kinds:
First method is to adopt insulation bearing.So-called insulation bearing, a kind of is to be coated with firm, the even ceramic material of one deck in the outer ring of bearing or the outer surface of inner ring.Another kind is to use ceramic rolling element.But insulation bearing has following shortcoming: 1. dependence on import costs an arm and a leg.2. the market injected volume is little, and delivery cycle is long.3. the maintenance cost in later stage is high.
Second method is the pad insulating material film at the endoporus place of the bearing chamber of being made up of internal bearing cover and electric motor end cap, makes between bearing and the end cap and insulate.Though this method has been practiced thrift cost to a certain extent, shortcoming also clearly: 1. the support strength of bearing is poor slightly.2. poor thermal conductivity.3. though price is relatively cheap, fragile, damage the back and be difficult for repairing.
The utility model content
The utility model technical issues that need to address provide a kind of end cover structure of simple in structure, anti-shaft current that reliability is high, cheap.
For solving the problems of the technologies described above, the technical scheme that the utility model adopted is:
The end cover structure of anti-shaft current; Comprise bearing, the internal bearing cover that is positioned at the bearing inboard that is installed on the motor shaft, the electric motor end cap that is positioned at the bearing outside; The clutch shaft bearing cover is set between said electric motor end cap and the bearing outer ring; Second bearing holder (housing, cover) is set between the end face of said internal bearing cover and the relative internal bearing cover of bearing outer ring, and the end face that said clutch shaft bearing cover contacts with electric motor end cap is provided with insulating protective layer, and the end face that said second bearing holder (housing, cover) contacts with internal bearing cover also is provided with insulating protective layer.
The further improvement of the utility model is: said insulating protective layer is the insulating barrier that enamel technology is made, and the thickness of said insulating protective layer is 0.5～1 millimeter.
Because the technological progress of having adopted technique scheme, the utility model to obtain is:
The utility model is provided with clutch shaft bearing cover, second bearing holder (housing, cover) between bearing chamber endoporus and bearing outer ring; And the clutch shaft bearing cover and the associated end face of second bearing holder (housing, cover) are carried out enamel technology handle; Form hard, fine and close, firm insulating protective layer; Insulating protective layer does not directly contact with bearing, can bear the above voltage of 5000V, and cost is lower.For guaranteeing that quality of fit is installed, need be inserted in the clutch shaft bearing cover afterwards to the position fine finishining of electric motor end cap installation shaft bearing sleeve, again electric motor end cap is carried out whole fine finishining, can guarantee the requirement of electric motor end cap seam and bearing chamber form and position tolerance.Through repeatedly experiment, optimization, this end cover structure can satisfy the applied environment of PWM variable-frequency motor, realizes the effective protection to bearing.Be applied on high 80～315 millimeters variable-frequency motor of motor center at present, realized standardization and seriation design and application, produced good economic benefit.The utility model has effectively prevented shaft current, has protected bearing, prolongs the useful life of bearing, has advantage simple in structure, that reliability is high, cheap.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Wherein, 1, the clutch shaft bearing cover, 2, second bearing holder (housing, cover), 3, bearing, 4, electric motor end cap, 5, internal bearing cover, 6, motor shaft.
Embodiment
Below in conjunction with accompanying drawing the utility model is explained further details:
The end cover structure of anti-shaft current, as shown in Figure 1, comprise bearing 3, electric motor end cap 4, internal bearing cover 5.Said Bearing Installation is on motor shaft 6, and the inboard of bearing 3 is provided with internal bearing cover 5, the arranged outside electric motor end cap 4 of bearing 3.Clutch shaft bearing cover 1 is set between said electric motor end cap 4 and bearing 3 outer rings, between the end face of the relative internal bearing cover 5 of said internal bearing cover 5 second bearing holder (housing, cover) 2 is set with bearing 3 outer rings.The end face that said clutch shaft bearing cover 1 contacts with electric motor end cap 4 is provided with insulating protective layer, and the end face that said second bearing holder (housing, cover) 2 contacts with internal bearing cover 5 also is provided with insulating protective layer.Said insulating protective layer is hard, fine and close, the firm insulating protective layer of making through enamel technology, and the thickness of said insulating protective layer is 0.5～1 millimeter.
Claims (2)
1. prevent the end cover structure of shaft current; Comprise bearing (3), the internal bearing cover (5) that is positioned at the bearing inboard that is installed on the motor shaft (6), the electric motor end cap (4) that is positioned at the bearing outside; It is characterized in that: between said electric motor end cap (4) and bearing (3) outer ring clutch shaft bearing cover (1) is set; Second bearing holder (housing, cover) (2) is set between the end face of said internal bearing cover (5) and the relative internal bearing cover in bearing (3) outer ring (5); Said clutch shaft bearing cover (1) is provided with insulating protective layer with the end face that electric motor end cap (4) contacts, and said second bearing holder (housing, cover) (2) also is provided with insulating protective layer with the end face that internal bearing cover (5) contacts.
2. the end cover structure of anti-shaft current according to claim 1 is characterized in that: said insulating protective layer is the insulating barrier that enamel technology is made, and the thickness of said insulating protective layer is 0.5～1 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201702879U CN202550772U (en) | 2012-04-20 | 2012-04-20 | End cap structure for preventing shaft currents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201702879U CN202550772U (en) | 2012-04-20 | 2012-04-20 | End cap structure for preventing shaft currents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202550772U true CN202550772U (en) | 2012-11-21 |
Family
ID=47171339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201702879U Expired - Lifetime CN202550772U (en) | 2012-04-20 | 2012-04-20 | End cap structure for preventing shaft currents |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202550772U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539087A (en) * | 2015-01-26 | 2015-04-22 | 沈阳工业大学 | Non-contact type electric energy transmission device |
-
2012
- 2012-04-20 CN CN2012201702879U patent/CN202550772U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539087A (en) * | 2015-01-26 | 2015-04-22 | 沈阳工业大学 | Non-contact type electric energy transmission device |
| CN104539087B (en) * | 2015-01-26 | 2017-05-10 | 沈阳工业大学 | Non-contact type electric energy transmission device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121121 |