CN103312074A - Motor rotor, motor with same and manufacturing method of motor rotor - Google Patents
Motor rotor, motor with same and manufacturing method of motor rotor Download PDFInfo
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- CN103312074A CN103312074A CN2012100581797A CN201210058179A CN103312074A CN 103312074 A CN103312074 A CN 103312074A CN 2012100581797 A CN2012100581797 A CN 2012100581797A CN 201210058179 A CN201210058179 A CN 201210058179A CN 103312074 A CN103312074 A CN 103312074A
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- insulating sleeve
- rotor
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- base substrate
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Abstract
The invention provides a motor rotor, a motor with the same and a manufacturing method of the motor rotor. The motor rotor of the invention comprises a bearing end which is supported by a motor bearing (6). The motor rotor further comprises an insulating sleeve (7) which is fixedly sleeved at the periphery of the bearing end. According to the motor rotor and the motor with the same, stripe electric arc scratches generated by shaft current can be effectively prevented from being produced on the inner surface of the motor bearing; and the service life of the motor bearing is improved, safe production is benefited, and the operation and maintenance costs of the motor are reduced.
Description
Technical field
The present invention relates to machine field, more specifically, relate to a kind of rotor, have the manufacture method of its motor and rotor.
Background technology
According to electric machine structure and operation principle, because stator core combinated seam, stator silicon steel sheet seam, non-uniform air-gap between stator and the rotor, axle center and magnetic field center are inconsistent etc., and the main shaft of motor will rotate in a not exclusively symmetrical magnetic field inevitably.Like this, will produce an alternating voltage at the axle two ends.Require under normal circumstances unit rotating part insulation against ground resistance greater than 2M Ω, if just may produce shaft current macro-axis two ends while ground connection.
In motor operation course, if the existence of shaft current is arranged between diaxon socket end or machine shaft and bearing, will greatly shorten the useful life for motor bearings so.Slight moves thousands of hours, serious even can only move several hours, and production brings great adverse effect to site safety.Simultaneously since damage of bearings and replacing bring directly and indirect economic loss also can't neglect.
Under normal circumstances, the existence of lubricating oil film is arranged between machine shaft and bearing, play the effect of insulation.For lower shaft voltage, this layer lubricating oil film still can be protected its insulation property, can not produce shaft current.But when shaft voltage is increased to certain numerical value, especially when motor start-up, the lubricating oil film in the bearing is unstable formation also, and shaft voltage will puncture oil film and discharge, consist of the loop, shaft current will be passed through from the metal contact of bearing and rotating shaft, because this metal contact is very little, so the current density of these points is large, produce high temperature in moment, make the local scorification of bearing, splashed under the effect of grinding pressure by the bearing metal of scorification, so burn small rut at bearing inner surface.General because rotating shaft hardness and mechanical strength are than the height of bearing burning out alloy, and the symptom that usually shows is that bearing inner surface is forced out strip electric arc scar.Therefore, for avoiding the generation of this kind situation, need motor bearings is designed to the structure of insulation bearing.
Basic reason for shaft current formation, the scheme that general insulation bearing adopts has two kinds: (1) in the bearing inboard or rotor be coated with one deck insulating material, but the requirement of this anti-wear performance to material, insulation property, stability is very high, and the cost of insulating material is also higher; (2) increase one deck insulating sleeve between bearing and rear end cap, but that bearing needs is radially fixing, the steel screw is fixing then to be equivalent to and to consist of the closed-loop path if adopt, if adopt the insulation screw, and general insulation screw intensity is not very high.Therefore this two schemes has its certain limitation.
Summary of the invention
The object of the invention is to provide a kind of motor bearings inner surface that can prevent strip electric arc scar to occur, improve the motor bearings rotor in useful life, have the manufacture method of its motor and rotor.
The invention provides a kind of rotor, comprise by the bearing end of motor bearings supporting, also comprise insulating sleeve, be sheathed on regularly the periphery of bearing end.
Further, the insulation resistance of insulating sleeve is greater than 2M Ω.
Further, the thickness of insulating sleeve is between 1 to 2mm.
Further, insulating sleeve is the filled polytetrafluoroethylene collar, the epoxy fabric swatch collar or solidifies without the latitude band collar.
The present invention also provides a kind of motor, comprises motor stator, is positioned at the rotor of motor stator inside, and the motor bearings of supporting motor rotor, rotor are aforesaid rotor, and motor bearings is bearing in the periphery of the insulating sleeve of rotor.
The present invention also provides a kind of manufacture method of rotor, comprises the steps: step a. processing insulating sleeve base substrate; Step b. heats the insulating sleeve base substrate; Insulating sleeve base substrate after step c will heat is assemblied in the bearing end of rotor in the mode of interference fit.
Further, after step c, manufacture method also comprises: steps d. after the cooling of the insulating sleeve base substrate that assembles, judge between the bearing end of insulating sleeve base substrate and rotor whether have relative motion; Step e. will be finish-machined to insulating sleeve without the insulating sleeve base substrate of relative motion with the bearing end of rotor.
Further, after step e, manufacture method also comprises: step f. measures the insulation resistance of insulating sleeve, when insulation resistance during greater than 2M Ω, judges that insulating sleeve is up-to-standard.
The thickness of the insulating sleeve base substrate of processing in step a further, is 4 to 6mm; The thickness of the insulating sleeve that forms in step e is between 1 to 2mm.
Further, in step b, the insulating sleeve base substrate is heated to 45～60 ℃.
Further, in step b, the insulating sleeve idiosome is heated to 50 ℃.
Further, in step c the bilateral magnitude of interference of interference fit between 0.10 to 0.15mm.
According to rotor of the present invention, owing at the bearing end of rotor insulating sleeve being set, make electricity isolation between rotor and the motor bearings, can effectively prevent the strip electric arc scar that the motor bearings inner surface occurs because of shaft current.Improve the useful life of motor bearings, be beneficial to safety in production, reduced the operation and maintenance cost of motor.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the part-structure schematic diagram according to motor of the present invention and rotor thereof;
Fig. 2 is the A section structure for amplifying schematic diagram of Fig. 1.
Embodiment
Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.
Shown in Fig. 1 to 2, the motor of the present embodiment mainly comprises rotor 1, motor stator 2, electric machine casing 3, oil resistance sealing 4, back end cover for motor 5, motor bearings 6 and insulating sleeve 7.Motor stator 2 is sheathed on rotor 1 outside; Electric machine casing 3 is set in the outside of motor stator 2; Back end cover for motor 5 is covered on rearward end and the supporting motor bearing 6 of electric machine casing 3.Rotor 1 comprises the bearing end that is positioned at its end, and insulating sleeve 7 is set in the periphery of bearing end regularly, and motor bearings 6 is bearing in the periphery of insulating sleeve 7.Because the bearing end at rotor 1 is provided with insulating sleeve 7, make electricity isolation between rotor 1 and the motor bearings 6, cut off the loop of shaft current, thereby the strip electric arc scar that occurs because of shaft current of the inner surface that can effectively prevent motor bearings 6, this has significantly improved the useful life of motor bearings 6, be beneficial to safety in production, reduced the operation and maintenance cost of motor.
Insulating sleeve 7 can be by filled polytetrafluoroethylene (PTFE), epoxy fabric swatch or solidify the collar of making without materials such as latitude bands.The collar material of more than enumerating has preferably characteristics of high rigidity, corrosion-resistant, ageing-resistant, high-low temperature resistant, insulation property.The thickness of insulating sleeve 7 (monolateral) can be chosen between the 1-2mm.If insulating sleeve 7 is blocked up, then in the situation of the internal diameter that does not change motor bearings 6, certainly will to reduce the rotor outside dimension, can affect like this rigidity and the critical whirling speed of rotor 1.Therefore, as long as guarantee insulation and the stability of insulating sleeve, insulating sleeve 7 need not too thick.According to the requirement of F grade, the insulation resistance of insulating sleeve 7 can satisfy insulating requirements greater than 2M Ω.
Insulating sleeve 7 is fixed on the bearing end of rotor 1, need to guarantee this insulating sleeve 7 can not and rotor 1 between relatively rotate or relatively move.This mode that can take hot jacket to install guarantees.The manufacture method of the rotor of the present embodiment is as follows:
Step a. processing insulating sleeve base substrate.Cause axiality bigger than normal owing to hot charging later insulating sleeve can deform, be easy to have an accident when the rotor High Rotation Speed, therefore, the insulating sleeve base substrate before hot charging need stay certain surplus.The thickness of insulating sleeve base substrate can be fabricated to 4 to 6mm, and preferably about 5mm, the insulating sleeve base substrate is too thin, and then to add man-hour yielding, too thickly then can cause the unnecessary wastes such as material and process time.The material of processing insulating sleeve base substrate can be filled polytetrafluoroethylene, epoxy fabric swatch or solidify without the latitude band etc.
Step b. heats the insulating sleeve base substrate.Relation between the magnitude of interference during according to the coefficient of expansion of insulating sleeve inside/outside diameter size, material and assembling thereof can be heated to the insulating sleeve base substrate 45～60 ℃, preferably, the insulating sleeve base substrate is heated to 50 ℃.
Insulating sleeve base substrate after step c will heat is assemblied in the bearing end of rotor 1 in the mode of interference fit.The bilateral magnitude of interference of interference fit is best between 0.10 to 0.15mm.
Steps d. after the cooling of the insulating sleeve base substrate that assembles, judge between the bearing end of insulating sleeve base substrate and rotor 1 whether have relative motion.Should guarantee can not relatively rotate and movement between insulating sleeve base substrate and the rotor, just can enter next step.
Step e. will be finish-machined to insulating sleeve 7 without the insulating sleeve base substrate of relative motion with the bearing end of rotor 1.Wherein fine finishining step can comprise: (1) upper lathe carries out rough turn to the insulating sleeve base substrate that assembles.The insulating sleeve base substrate that assembles is carried out when rough turn each depth of cut preferably less than 0.5mm, otherwise the excessive insulating sleeve base substrate that easily causes of cutting force comes off.(2) upper grinding machine finish grindes the insulating sleeve base substrate after rough turn.The thickness of the insulating sleeve 7 that preferably, forms in this step e is between 1 to 2mm.
Step f. measures the insulation resistance of insulating sleeve 7 with insulating megger constant resistance measurement mechanism, according to the F class requirement, when insulation resistance during greater than 2M Ω, judge that insulating sleeve 7 is up-to-standard.
Motor of the present invention is suitable for but is not limited to use in the centrifugal compressor of field of air conditioning.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect: owing at the bearing end of rotor insulating sleeve being set, make electricity isolation between rotor and the motor bearings, can effectively prevent the strip electric arc scar that the motor bearings inner surface occurs because of shaft current.Significantly improve the useful life of motor bearings, be beneficial to safety in production, reduced the operation and maintenance cost of motor.And no matter this insulating sleeve is from material cost, or processing cost all has higher advantage than the frame mode of routine, and assembling is also very convenient.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a rotor comprises by the bearing end of motor bearings (6) supporting, and it is characterized in that, described rotor also comprises insulating sleeve (7), is sheathed on regularly the periphery of described bearing end.
2. rotor according to claim 1 is characterized in that, the insulation resistance of described insulating sleeve (7) is greater than 2M Ω.
3. rotor according to claim 2 is characterized in that, the thickness of described insulating sleeve (7) is between 1 to 2mm.
4. each described rotor in 3 according to claim 1 is characterized in that, described insulating sleeve (7) is the filled polytetrafluoroethylene collar, the epoxy fabric swatch collar or solidifies without the latitude band collar.
5. motor, comprise motor stator (2), be positioned at the inner rotor (1) of described motor stator (2), support the motor bearings (6) of described rotor (1), it is characterized in that, described rotor is each described rotor in 4 according to claim 1, and described motor bearings (6) is bearing in the periphery of the insulating sleeve (7) of described rotor.
6. the manufacture method of a rotor is characterized in that, comprises the steps:
Step a. processing insulating sleeve base substrate;
Step b. heats described insulating sleeve base substrate;
Described insulating sleeve base substrate after step c will heat is assemblied in the bearing end of described rotor in the mode of interference fit.
7. manufacture method according to claim 6 is characterized in that, after described step c, described manufacture method also comprises:
Steps d. after the described insulating sleeve base substrate cooling that assembles, judge between the bearing end of described insulating sleeve base substrate and described rotor whether have relative motion;
Step e. will be finish-machined to insulating sleeve without the described insulating sleeve base substrate of relative motion with the bearing end of described rotor.
8. manufacture method according to claim 7 is characterized in that, after described step e, described manufacture method also comprises:
Step f. measures the insulation resistance of described insulating sleeve, when insulation resistance during greater than 2M Ω, judges that described insulating sleeve is up-to-standard.
9. according to claim 7 or 8 described manufacture methods, it is characterized in that,
The thickness of the described insulating sleeve base substrate of processing in described step a is 4 to 6mm;
The thickness of the described insulating sleeve that forms in described step e is between 1 to 2mm.
10. each described manufacture method in 8 according to claim 6 is characterized in that, in described step b described insulating sleeve base substrate is heated to 45～60 ℃.
11. manufacture method according to claim 10 is characterized in that, in described step b the insulating sleeve idiosome is heated to 50 ℃.
12. each described manufacture method in 8 is characterized in that according to claim 6, at the bilateral magnitude of interference of interference fit described in the described step c between 0.10 to 0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210058179.7A CN103312074B (en) | 2012-03-06 | 2012-03-06 | Rotor, there is its motor and the manufacture method of rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210058179.7A CN103312074B (en) | 2012-03-06 | 2012-03-06 | Rotor, there is its motor and the manufacture method of rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103312074A true CN103312074A (en) | 2013-09-18 |
| CN103312074B CN103312074B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210058179.7A Active CN103312074B (en) | 2012-03-06 | 2012-03-06 | Rotor, there is its motor and the manufacture method of rotor |
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| Country | Link |
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| CN (1) | CN103312074B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016062129A1 (en) * | 2014-10-23 | 2016-04-28 | 常州格力博有限公司 | Double insulated motor and pinion device |
| CN107528407A (en) * | 2016-06-20 | 2017-12-29 | 东方电气集团东方电机有限公司 | A kind of umbrella-type generator axle insulation system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692590A (en) * | 2009-08-10 | 2010-04-07 | 南阳防爆集团股份有限公司 | Motor insulating bearing device and manufacturing method thereof |
| JP2010158141A (en) * | 2009-01-05 | 2010-07-15 | Mitsubishi Electric Corp | Rotor for motor, motor, method for manufacturing rotor for motor and air conditioner |
| WO2011111187A1 (en) * | 2010-03-10 | 2011-09-15 | 三菱電機株式会社 | Electric motor rotor, electric motor, air conditioner, and production method for electric motor rotor |
| JP2011239508A (en) * | 2010-05-07 | 2011-11-24 | Mitsubishi Electric Corp | Rotator of electromotor and electromotor and method for manufacturing rotator of electromotor, and air conditioner |
| CN202444365U (en) * | 2012-03-06 | 2012-09-19 | 珠海格力电器股份有限公司 | Motor rotor and motor with same |
-
2012
- 2012-03-06 CN CN201210058179.7A patent/CN103312074B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010158141A (en) * | 2009-01-05 | 2010-07-15 | Mitsubishi Electric Corp | Rotor for motor, motor, method for manufacturing rotor for motor and air conditioner |
| CN101692590A (en) * | 2009-08-10 | 2010-04-07 | 南阳防爆集团股份有限公司 | Motor insulating bearing device and manufacturing method thereof |
| WO2011111187A1 (en) * | 2010-03-10 | 2011-09-15 | 三菱電機株式会社 | Electric motor rotor, electric motor, air conditioner, and production method for electric motor rotor |
| JP2011239508A (en) * | 2010-05-07 | 2011-11-24 | Mitsubishi Electric Corp | Rotator of electromotor and electromotor and method for manufacturing rotator of electromotor, and air conditioner |
| CN202444365U (en) * | 2012-03-06 | 2012-09-19 | 珠海格力电器股份有限公司 | Motor rotor and motor with same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016062129A1 (en) * | 2014-10-23 | 2016-04-28 | 常州格力博有限公司 | Double insulated motor and pinion device |
| CN107528407A (en) * | 2016-06-20 | 2017-12-29 | 东方电气集团东方电机有限公司 | A kind of umbrella-type generator axle insulation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103312074B (en) | 2016-08-24 |
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