CN210686655U - Rolling bearing, motor and wind generating set - Google Patents
Rolling bearing, motor and wind generating set Download PDFInfo
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- CN210686655U CN210686655U CN201921849201.3U CN201921849201U CN210686655U CN 210686655 U CN210686655 U CN 210686655U CN 201921849201 U CN201921849201 U CN 201921849201U CN 210686655 U CN210686655 U CN 210686655U
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- 238000005096 rolling process Methods 0.000 title claims abstract description 76
- 230000007704 transition Effects 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000005461 lubrication Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 12
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Rolling Contact Bearings (AREA)
Abstract
The embodiment of the application provides a rolling bearing, a motor and a wind generating set, wherein the rolling bearing comprises a bearing outer ring and a bearing inner ring which are provided with rolling paths; the cross section of the raceway penetrating through the central shaft of the rolling bearing is an arc line, the arc line comprises a plurality of arc line sections with the circle centers positioned on the same side, and two adjacent arc line sections are in smooth transition connection; the curvature radius of each arc segment is increased from the middle of the roller path to the edge in sequence. The application provides a antifriction bearing has the non-constant raceway of arc segment curvature, through the design that changes the camber, under the condition that the unit bears the fatigue load and does not aggravate, has reduced raceway contact stress, has improved antifriction bearing's bearing capacity, has improved antifriction bearing's raceway fatigue life, correspondingly, also can increase motor, wind generating set's load adaptability, increases substantially motor, wind generating set's maintenance cycle.
Description
Technical Field
The application relates to the technical field of bearings, in particular to a rolling bearing, a motor and a wind generating set.
Background
Rolling bearings are important standard parts for supporting rotating shafts and parts on the shafts, and generally comprise rolling bodies, bearing inner rings, bearing outer rings, retainers and the like, wherein raceways are arranged on the bearing inner rings and the bearing outer rings, and the rolling bodies roll in the raceways. In the field of wind power generation, a rolling bearing is a widely applied part, and a wind generating set is located in a remote field area all the year round, so that the rolling bearing with longer service life is required.
At present, the curvature radii of bearing raceways in a yaw system and a pitch system of a wind generating set are the same, namely the cross sections of the raceways on a bearing inner ring and a bearing outer ring are generally circular. According to different design concepts of rolling bearing manufacturers, values of the curvature radius of the raceway are different, but the raceway formed by the single curvature radius is adopted, so that when the rolling bearing supports mechanical rotation with a rotating shaft of which the position is constantly changed, the existing rolling bearing is easy to abrade the raceway near the edge position of the raceway, and the condition can generate great adverse effects on the maintenance period of the wind generating set.
SUMMERY OF THE UTILITY MODEL
This application provides a antifriction bearing, motor and wind generating set to the shortcoming of current mode for solve the raceway edge easy wearing and tearing that prior art exists, the short technical problem of wind generating set bearing life.
In a first aspect, an embodiment of the present application provides a rolling bearing, including a bearing outer ring and a bearing inner ring, both provided with raceways;
the cross section of the raceway penetrating through the central shaft of the rolling bearing is an arc line, the arc line comprises a plurality of arc line sections with the circle centers positioned on the same side, and two adjacent arc line sections are in smooth transition connection;
the curvature radius of each arc segment is increased from the middle of the roller path to the edge in sequence.
In one embodiment, the arc is symmetrical about a center line in a radial direction of the rolling bearing.
In one embodiment, the middle of the raceway is provided with a lubrication groove.
In one embodiment, the arc includes a first arc segment and two second arc segments, the second arc segment being connected to both ends of the first arc segment.
In one embodiment, the first arc segment corresponds to a central angle β of 0 ° < β ≦ 70 °, and the second arc segment corresponds to a central angle γ of 0 ° < γ ≦ 20 °.
In one embodiment, the arc further comprises two third arc segments, the third arc segments being in smooth transition connection with the second arc segments.
In a second aspect, the present application provides an electrical machine comprising a generator or an electric motor, the electrical machine being characterized by comprising a rolling bearing as provided in the first aspect of the present application.
In a third aspect, the present application provides a wind park comprising a generator as provided in the second aspect of the present application.
The technical scheme provided by the embodiment of the application has the following beneficial technical effects:
the application provides a antifriction bearing has the non-constant raceway of arc segment curvature, through the design that changes the camber, under the condition that the unit bears the fatigue load and does not aggravate, has reduced raceway contact stress, has improved antifriction bearing's bearing capacity, has improved antifriction bearing's raceway fatigue life, correspondingly, also can increase motor, wind generating set's load adaptability, increases substantially motor, wind generating set's maintenance cycle.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic perspective view of a rolling bearing provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a raceway cross section of a rolling bearing provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a cross section of a raceway of another rolling bearing provided in an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a raceway cross section of a rolling bearing with lubrication grooves according to an embodiment of the present application;
fig. 5 is a schematic view of the angular ranges of arc segments in the raceway of a rolling bearing according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a raceway cross section of another rolling bearing provided in an embodiment of the present application.
Reference numerals:
100-bearing inner ring, 200-bearing outer ring, 300-raceway and 400-ball bearing;
310-lubrication groove.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As may be used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The terms referred to in this application will first be introduced and explained:
the raceway, the surface of the load-bearing part of the rolling bearing, which serves as the rolling track for the rolling bodies, is generally groove-shaped, with a circular arc-shaped cross-section with a radius slightly larger than the spherical radius of the rolling balls. Raceways are provided on both the inner and outer rings of the bearing, rolling bearings, in particular ball bearings, the balls rolling in the space formed by the raceways on the inner and outer rings of the bearing.
A center line in the radial direction of the rolling bearing, the center line being radially collinear with the rolling bearing and passing through a geometric center point of the rolling bearing.
The inventor of the application considers that the rolling bearing used in the existing wind power yawing system and the variable pitch system adopts the raceway design with a single curvature radius, but in the wind power yawing system and the variable pitch system, the changes of the rotating position and the attitude can be frequently generated, the force borne by the balls on the rolling bearing is not only the acting force in the radial direction of the bearing, but also the deflection can be frequently generated, so that the rolling bearing is easy to generate the abrasion of the raceway near the edge position of the raceway, under the working condition, the service life of the bearing is greatly reduced compared with that of a common use occasion, the maintenance frequency of the wind driven generator is increased, and great adverse effects are caused on production.
The application provides a bearing, motor and wind generating set aims at solving prior art as above technical problem.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
In a first aspect, embodiments of the present application provide a rolling bearing, as shown in fig. 1 and 2, including a bearing outer ring 200 and a bearing inner ring 100, both provided with a raceway 300; the cross section of the raceway 300 passing through the central shaft of the rolling bearing is an arc line, the arc line comprises a plurality of arc line sections with the circle centers positioned on the same side, and two adjacent arc line sections are in smooth transition connection; the curvature radiuses of two adjacent arc line segments are different.
In the present application, the cross sections of the raceways 300 on the bearing outer ring 200 and the bearing inner ring 100 are matched with each other, and the design concept is the same, but there may be a difference in size, so that the present application does not separately describe the raceway 300 on the bearing outer ring 200 and the raceway 300 on the bearing inner ring 100. A common structure included in the rolling bearing is a cage, which is not described further because it is not the focus of the improvement of the present application. The cross section of the raceway 300 in the rolling bearing provided by the application is composed of multiple arc segments with different curvature radiuses, the radiuses are R1, R2, R3, R4 and the like, and in order to ensure smooth transition of adjacent arc segments, the difference of the curvature radiuses is not too large, the rolling bearing is specifically arranged, and the rolling bearing can be determined according to the specific working condition and the overall structure of the rolling bearing.
The application provides a rolling bearing has the nonconstant raceway 300 of arc segment curvature, through the design that changes the curvature, bear under the condition that fatigue load does not aggravate at the unit, when bearing capacity atress direction changes, reduced the raceway 300 contact stress that originally adopts unitary raceway 300 to bear, improved rolling bearing's whole bearing capacity, the bearing operating mode that the good adaptation rotational position probably changes has improved rolling bearing life under special operational environment.
In one possible embodiment, as shown in fig. 3, the arc line is symmetrical with respect to the center line in the radial direction of the rolling bearing. For example, the arc includes two equal length second arc segments of radius R2, and a first arc segment of radius R1. Under most circumstances, the stress condition of the rolling bearing is balanced left and right, so the raceway 300 of the rolling bearing adopts a symmetrical pattern, and under the condition that an arc line is formed by combining arc line segments with different curvatures in multiple sections, the requirement of improving the integral bearing capacity of the rolling bearing can be met by adopting a symmetrical structure, the rolling bearing can be ensured to have a relatively balanced stress condition, and the rolling bearing is ensured to have a relatively long service life.
In one possible embodiment, as shown in fig. 4, the raceway 300 is provided with a lubrication groove 310 in the middle. The lubricating groove 310 is arranged in the middle of the raceway 300, so that a storage space can be provided for lubricating oil or lubricating grease, the lubricating property of the rolling bearing is improved, and the rolling bearing is lubricated fully and durably under the condition that the section consists of a plurality of arc segments with different curvatures.
In one possible embodiment, as shown in fig. 2, the radius of curvature of each arc segment increases from the middle to the edge of the raceway 300. Each arc line segment is formed in a combination mode that the middle part is gradually opened towards two sides of the bearing raceway 300, the curvature radius of the arc line segment close to the middle part of the raceway 300 is small, the curvature is large, the curvature radius of the arc line segment close to the edge of the raceway 300 is large, the curvature is small, the arc line segment tends to be straight, and the arc line segment can be known according to engineering calculation and FEA (Finite Element Analysis): the smaller the curvature radius of the raceway 300, the lower the contact stress of the raceway 300, the greater the risk of edge contact of the raceway 300 with the ball 400, and the larger the curvature radius of the raceway 300, the higher the contact stress of the raceway 300, and the lower the risk of edge contact of the raceway 300 with the ball 400. By adopting the design that the curvature radius of each arc segment is sequentially increased from the middle to the edge of the raceway 300, the contact stress of the rolling bearing raceway 300 and the edge contact risk of the raceway 300 and the ball 400 can be balanced, and the service life of the rolling bearing with the position of the rotating shaft changing constantly is prolonged.
In one possible embodiment, as shown in fig. 3, the arc includes a first arc segment and two second arc segments, and the second arc segment is connected to both ends of the first arc segment. As a simpler design, the arc of the cross-section of the raceway 300 consists of two arc segments of curvature, one of which is located in the middle and the other of which is located on both sides, the second arc segments being of equal length in the case of a symmetrical figure of the arc. The rolling bearing with the structure has the advantages of simple structure and convenience in processing, and can meet the working condition that the position of the rotating shaft is constantly changed under most conditions.
In a specific embodiment, as shown in fig. 5, the central angle β corresponding to the first arc segment is 0 ° < β ° or less than 70 °, the central angle γ corresponding to the second arc segment is 0 ° < γ or less than 20 °, and the first arc segment is the first arc segment except the second arc segment, and the first arc segment has a large proportion in the cross section of the raceway 300, so that the rolling bearing can stably operate in the rotation condition with a constant rotation shaft position.
In a specific embodiment, as shown in fig. 6, the arc further includes two third arc segments, the third arc segment is in smooth transition connection with the second arc segment, the radius of the third arc segment is R3, and the corresponding central angle is α, in combination with the foregoing embodiments, the arc may be a symmetrical graph, that is, the two third arc segments have the same length, or may be a partially symmetrical graph, that is, the first arc segment and the second arc segment are partially symmetrical, and the two third arc segments have different lengths, and a specific design scheme is used according to different use requirements, for example, in an occasion where the wind direction changes frequently, in which the position of the rotation axis of the rolling bearing changes continuously, and the rolling bearing also rotates around its rotation axis, the mechanical environment is complex, and in order to ensure that the contact stress of the raceway 300 and the risk of edge contact between the raceway 300 and the steel ball are balanced, the arc segments with three curvature radii are used to form the cross section of the raceway 300.
In a second aspect, the present application provides an electrical machine comprising a generator or an electric motor, the electrical machine being characterized by comprising a rolling bearing as provided in the first aspect of the present application.
The motor that provides in this application, the antifriction bearing that has the nonconstant raceway 300 of arc segment curvature has been adopted, this antifriction bearing has the design of change curvature through raceway 300, under the condition that the unit bears fatigue load and does not aggravate, when bearing capacity atress direction changes, the raceway 300 contact stress that originally adopted single curvature's raceway 300 to bear has been reduced, the whole bearing capacity of antifriction bearing has been improved, the bearing operating mode that the good adaptation rotational position probably changes, the life of antifriction bearing under special operational environment has been improved. Therefore, the adaptability of the motor to application scenes with complex mechanical working conditions is improved, and the service life of the motor is prolonged.
In a third aspect, the present application provides a wind park comprising a generator as provided in the second aspect of the present application.
The utility model provides a wind generating set has adopted the motor that this application provided, because the antifriction bearing's that this application provided application has improved the adaptability of motor to the complicated application scene of mechanics operating mode, and the working life of motor is longer to make wind generating set's effective working life longer, also can increase substantially to wind generating set's maintenance cycle, saved the maintenance cost, also reduced the power generation cost. Optionally, the wind turbine generator system of the present application is specifically a wind turbine generator system, and the electric machine is a generator and/or an electric motor in the wind turbine generator system.
By applying the embodiment provided in the application, at least the following beneficial effects can be realized:
1. the application provides a antifriction bearing has the non-constant raceway of arc segment curvature, through the design that changes the camber, under the condition that the unit bears the fatigue load and does not aggravate, when bearing capacity atress direction changes, reduced the raceway contact stress that originally adopts single formula raceway to bear, improved antifriction bearing's whole bearing capacity, the bearing operating mode that the good adaptation rotational position probably changes has improved antifriction bearing under special operational environment.
2. The application provides a be provided with lubrication groove in the middle of antifriction bearing's the raceway, can provide storage space for lubricating oil or lubricating grease, improve antifriction bearing's lubricity, guarantee under the cross-section condition of constituteing by the different multistage arc sections of camber, antifriction bearing obtains abundant lasting lubrication.
3. The utility model provides a rolling bearing is through the design that the curvature radius who adopts each arc section increases in proper order to the edge by the centre of raceway, can make rolling bearing raceway contact stress and the marginal contact risk of raceway and spin reach the balance, improves the position constantly changing rolling bearing's of rotation axis life.
4. The application provides a rolling bearing, its raceway cross sectional shape comprises the arc line section that has three kinds of radius of curvature, can ensure that raceway contact stress and the marginal contact risk of raceway and steel ball obtain the balance for rolling bearing uses in the complicated occasion of mechanical environment.
5. The motor that provides in this application owing to adopt the above-mentioned antifriction bearing that this application provided, can better adapt to the complicated application scene of mechanics operating mode, and working life is longer.
6. The utility model provides a wind generating set owing to adopt the motor that has the above-mentioned antifriction bearing that this application provided, effective working life is longer, and wind generating set's maintenance cycle is longer, and maintenance cost and generating cost are all lower, and the economic benefits that can produce are higher.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (8)
1. A rolling bearing, characterized by comprising a bearing outer ring (200) and a bearing inner ring (100) provided with a raceway (300);
the cross section of the raceway (300) penetrating through the central shaft of the rolling bearing is an arc line, the arc line comprises a plurality of arc line sections with the circle centers positioned on the same side, and two adjacent arc line sections are in smooth transition connection;
the curvature radius of each arc line segment is increased from the middle of the raceway (300) to the edge in sequence.
2. The rolling bearing of claim 1 wherein the arc is symmetrical about a center line in a radial direction of the rolling bearing.
3. Rolling bearing according to claim 1, wherein the raceway (300) is provided with a lubrication groove (310) in the middle.
4. Rolling bearing according to any of claims 1 to 3 wherein said arc comprises a first arc segment and two second arc segments, said second arc segments being connected to both ends of said first arc segment.
5. The rolling bearing of claim 4 wherein the first arc segment corresponds to a central angle β of 0 ° < β ≦ 70 °, and the second arc segment corresponds to a central angle γ of 0 ° < γ ≦ 20 °.
6. The rolling bearing of claim 4 wherein the arc further comprises two segments of a third arc segment, the third arc segment being in smooth transition with the second arc segment.
7. An electrical machine comprising a generator or an electric motor, characterized in that it comprises a rolling bearing according to any one of claims 1 to 6.
8. A wind power plant comprising a generator as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921849201.3U CN210686655U (en) | 2019-10-29 | 2019-10-29 | Rolling bearing, motor and wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921849201.3U CN210686655U (en) | 2019-10-29 | 2019-10-29 | Rolling bearing, motor and wind generating set |
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| CN210686655U true CN210686655U (en) | 2020-06-05 |
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| CN201921849201.3U Active CN210686655U (en) | 2019-10-29 | 2019-10-29 | Rolling bearing, motor and wind generating set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412971A (en) * | 2020-11-19 | 2021-02-26 | 大族激光科技产业集团股份有限公司 | Flexible bearing and harmonic reducer |
| CN114325271A (en) * | 2021-12-31 | 2022-04-12 | 北京金风科创风电设备有限公司 | Bearing voltage withstand test method and method for inhibiting partial discharge of bearing |
-
2019
- 2019-10-29 CN CN201921849201.3U patent/CN210686655U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412971A (en) * | 2020-11-19 | 2021-02-26 | 大族激光科技产业集团股份有限公司 | Flexible bearing and harmonic reducer |
| CN114325271A (en) * | 2021-12-31 | 2022-04-12 | 北京金风科创风电设备有限公司 | Bearing voltage withstand test method and method for inhibiting partial discharge of bearing |
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