CN202444365U - Motor rotor and motor with same - Google Patents
Motor rotor and motor with same Download PDFInfo
- Publication number
- CN202444365U CN202444365U CN2012200827947U CN201220082794U CN202444365U CN 202444365 U CN202444365 U CN 202444365U CN 2012200827947 U CN2012200827947 U CN 2012200827947U CN 201220082794 U CN201220082794 U CN 201220082794U CN 202444365 U CN202444365 U CN 202444365U
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- motor
- rotor
- insulating sleeve
- bearing
- utility
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Abstract
The utility model provides a motor rotor and a motor with the same. The motor rotor comprises a bearing end which is supported by a motor bearing (6), and 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 at the inner surface of the motor bearing; and moreover, the service life of the motor bearing is improved, the safety production is benefited, and the operation and maintenance costs of the motor are reduced.
Description
Technical field
The utility model relates to machine field, more specifically, relates to a kind of rotor and has its motor.
Background technology
According to electric machine structure and operation principle; Because stator core combinated seam, stator silicon steel sheet seam; Air gap is inhomogeneous between stator and the rotor, and 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.While ground connection require unit rotating part insulation against ground resistance greater than 2M Ω under the normal condition, if just possibly produce shaft current at the macro-axis two ends.
In motor operation course,, will shorten greatly the useful life for motor bearings so if the existence of shaft current is arranged between diaxon socket end or machine shaft and bearing.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 the normal condition, 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 was increased to certain numerical value, especially when motor start-up, the lubricating oil film in the bearing is also unstable to be formed; Shaft voltage will puncture oil film and discharge, and constitute the loop, and shaft current will be passed through from the metal contact of bearing and rotating shaft; Because this metal contact is very little,, produce high temperature in moment so the current density of these points is big; Make the local scorification of bearing, splashed under the effect of grinding pressure by the bearing metal of scorification, so on bearing inner surface, burn small rut.General because rotating shaft hardness and mechanical strength are than the height of bearing burning out alloy, and the symptom that shows usually 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 to shaft current formation; The scheme that general insulation bearing adopts has two kinds: (1) is coated with one deck insulating material on bearing inboard or rotor; 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) between bearing and rear end cap, increase one deck insulating sleeve, but bearing need be radially fixing, if employing steel screw then is equivalent to and constitutes the closed-loop path, if employing insulation screw, and general insulation screw intensity is not very high.Therefore these two kinds of schemes all have its certain limitation.
The utility model content
The utility model purpose is to provide a kind of motor bearings inner surface that can prevent strip electric arc scar to occur, improve the rotor in motor bearings useful life and have its motor.
The utility model provides a kind of rotor, comprises by the bearing end of motor bearings supporting, also comprises insulating sleeve, is sheathed on the periphery of bearing end regularly.
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 the no latitude band collar.
The utility model also provides a kind of motor, comprises motor stator, is positioned at the inner rotor of motor stator, 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.
According to the rotor of the utility model, owing to insulating sleeve is set, make electricity isolation between rotor and the motor bearings at the bearing end of rotor, can prevent the strip electric arc scar that the motor bearings inner surface occurs because of shaft current effectively.Improve the useful life of motor bearings, be beneficial to safety in production, reduced the operation and the maintenance cost of motor.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide the further understanding to the utility model, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the part-structure sketch map according to motor of the utility model and rotor thereof;
Fig. 2 is the A portion structure for amplifying sketch map of Fig. 1.
Embodiment
Below with reference to accompanying drawing and combine embodiment to specify the utility model.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Shown in Fig. 1 to 2, the motor of 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 the rearward end and the supporting motor bearing 6 of electric machine casing 3.Rotor 1 comprises and is positioned at its bearing at end 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 can prevent the strip electric arc scar that the inner surface of motor bearings 6 occurs because of shaft current effectively, this has significantly improved the useful life of motor bearings 6; Be beneficial to safety in production, reduced the operation and the maintenance cost of motor.
Insulating sleeve 7 can be the collar of being processed by materials such as filled polytetrafluoroethylene (PTFE), epoxy fabric swatch or the no latitude bands of curing.The collar material of more than enumerating has high rigidity, corrosion-resistant, ageing-resistant, high-low temperature resistant, insulation property characteristics preferably.The thickness of insulating sleeve 7 (monolateral) can be chosen between the 1-2mm.If insulating sleeve 7 is blocked up, then under the situation of the internal diameter that does not change motor bearings 6, certainly will to reduce the rotor outside dimension, can influence the rigidity and the critical whirling speed of rotor 1 like this.Therefore, as long as guarantee the 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 manufacturing approach of the rotor of present embodiment is following:
Step a. processing insulating sleeve base substrate.Cause axiality bigger than normal owing to hot charging insulating sleeve later can deform, when the rotor high speed rotating, be easy to have an accident, 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 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 no 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 45～60 ℃ with the insulating sleeve base substrate, 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 with 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 between insulating sleeve base substrate and the rotor with mobile, could get into next step.
The insulating sleeve base substrate that step e. will not have relative motion with the bearing end of rotor 1 is finish-machined to insulating sleeve 7.Wherein fine finishining step can comprise: (1) is gone up lathe and is carried 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 causes easily of cutting force comes off.(2) going up grinding machine finish grindes the insulating sleeve base substrate after rough turn.The thickness of the insulating sleeve 7 that preferably, in this step e, forms is between 1 to 2mm.
Step f. measures the insulation resistance of insulating sleeve 7 with insulation megger constant resistance measurement mechanism, according to the F class requirement, when insulation resistance during greater than 2M Ω, judges that insulating sleeve 7 is up-to-standard.
The motor of the utility model is suitable for but is not limited in the centrifugal compressor of field of air conditioning, use.
From above description, can find out; The utility model the above embodiments have realized following technique effect: owing at the bearing end of rotor insulating sleeve is set; Make electricity isolation between rotor and the motor bearings, can prevent the strip electric arc scar that the motor bearings inner surface occurs because of shaft current effectively.Significantly improve the useful life of motor bearings, be beneficial to safety in production, reduced the operation and the 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 preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. a rotor comprises by the bearing end of motor bearings (6) supporting, it is characterized in that said rotor also comprises insulating sleeve (7), is sheathed on the periphery of said bearing end regularly.
2. rotor according to claim 1 is characterized in that, the insulation resistance of said insulating sleeve (7) is greater than 2M Ω.
3. rotor according to claim 2 is characterized in that, the thickness of said insulating sleeve (7) is between 1 to 2mm.
4. according to each described rotor in the claim 1 to 3, it is characterized in that said insulating sleeve (7) is the filled polytetrafluoroethylene collar, the epoxy fabric swatch collar or solidifies the no latitude band collar.
5. motor; Comprise motor stator (2); Be positioned at the inner rotor (1) of said motor stator (2), support the motor bearings (6) of said rotor (1), it is characterized in that; Said rotor is according to each described rotor in the claim 1 to 4, and said motor bearings (6) is bearing in the periphery of the insulating sleeve (7) of said rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200827947U CN202444365U (en) | 2012-03-06 | 2012-03-06 | Motor rotor and motor with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200827947U CN202444365U (en) | 2012-03-06 | 2012-03-06 | Motor rotor and motor with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202444365U true CN202444365U (en) | 2012-09-19 |
Family
ID=46825795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200827947U Expired - Lifetime CN202444365U (en) | 2012-03-06 | 2012-03-06 | Motor rotor and motor with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202444365U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312074A (en) * | 2012-03-06 | 2013-09-18 | 珠海格力电器股份有限公司 | Motor rotor, motor with same and manufacturing method of motor rotor |
-
2012
- 2012-03-06 CN CN2012200827947U patent/CN202444365U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312074A (en) * | 2012-03-06 | 2013-09-18 | 珠海格力电器股份有限公司 | Motor rotor, motor with same and manufacturing method of motor rotor |
| CN103312074B (en) * | 2012-03-06 | 2016-08-24 | 珠海格力电器股份有限公司 | Rotor, there is its motor and the manufacture method of rotor |
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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: 20120919 |