CN202696334U

CN202696334U - Motor rotor and motor

Info

Publication number: CN202696334U
Application number: CN 201220286643
Authority: CN
Inventors: 刘伟兵; 黄世杰; 陈志文
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd; Hefei Kaibang Motor Co Ltd; Henan Kaibang Motor Co Ltd; Chongqing Kaibang Motor Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd; Hefei Kaibang Motor Co Ltd; Henan Kaibang Motor Co Ltd; Chongqing Kaibang Motor Co Ltd
Priority date: 2012-06-18
Filing date: 2012-06-18
Publication date: 2013-01-23
Anticipated expiration: 2022-06-18

Abstract

The utility model provides a motor rotor and a motor. The motor rotor comprises a rotor iron core. A rotor shaft is installed in the rotor iron core, and at least one bearing is sleeved on the rotor shaft. The rotor shaft is further provided with at least one insulation sleeve in a sleeved mode. The bearing is sleeved outside the insulation sleeve. The motor is provided with a shell body. A stator and the rotor are installed in the shell body, wherein the rotor is provided with the rotor iron core, the rotor shaft is installed in the rotor iron core, and the rotor shaft is provided with the at least one bearing and the at least one insulation sleeve in a sleeved mode. The bearing is sleeved outside the insulation sleeve. The motor rotor and the motor enable the bearing to be directly contacted with the rotor shaft to cut off an oscillation circuit, avoid generation of oscillation voltage, reduce damage to the bearing, and prolong service life of the bearing.

Description

Rotor and motor

Technical field

The utility model relates to machine field, the motor that especially relates to a kind of rotor and have this rotor.

Background technology

Motor is widely used in the various electric equipments of industrial production and life, referring to Fig. 1, the end cap 11,12 that existing motor has housing 10 and is positioned at housing 10 two ends, housing 10 and end cap 11,12 surround a cavity, stator 15 and rotor 20 are installed in the cavity, and stator 15 has stator core 16 and is embedded into coil 17 on stator core 16.

Rotor 20 is installed in the stator 15, and can be with respect to stator 15 rotations.Rotor 20 has rotor core 21, and the middle part of rotor core 21 offers through hole, and armature spindle 22 is installed in this through hole, and armature spindle 22 and through hole interference fit, and armature spindle 22 rotates under the drive of rotor core 21, thus outside outputting power.

Also be set with two bearings 23 on armature spindle 22, lay respectively at end and the middle part of armature spindle 22, armature spindle 22 is bearing on the bearing 23, and two bearings 23 are separately fixed on the end cap 11,12.

When motor moves, there is electric current to flow through on the stator core 16, thereby forms voltage.And end cap 11,12 should be uncharged, so insulate between stator core 16 and the end cap 11,12.But because insulation is inadequate between more existing motor stator cores 16 and the end cap 11,12, the electric current that produces on the stator core 16 consists of the closed-loop path through end cap 11,12, bearing 23, armature spindle 22 and rotor core 21, form shaft current at armature spindle 22, produce shaft voltage at bearing 23 interior oil film two ends, shaft current and shaft voltage bring great infringement to bearing 23.

Because shaft current punctures the oil film discharge and produces high temperature between the ball of bearing 23 and Internal and external cycle, cause the fusing of bearing 23 local surfaces, form spots, pits on bearing 23 surfaces thus, the hardness of bearing 23 is descended, shorten useful life.

Therefore, existing motor has the design of the shaft current of preventing or shaft voltage mostly, for example between stator core and end cap seal is set, and perhaps between two bearings seal etc. is set, and these methods only can be cut off the closed-loop path of shaft current.

But more existing motors use variable frequency power supply, power supply includes higher harmonic components, under coupling effect, to form electrical potential difference between stator core 16 and the end cap 11,12, this just causes forming electric current on the end cap 11,12, electric current consists of the RLC oscillating circuit through stator core 16, end cap 11,12, bearing 23, armature spindle 22 and rotor core 21, and form thus oscillating voltage, oscillating voltage also can bring great infringement to bearing, the oil film of bearing also can be impaired because of oscillating voltage, has influence on the useful life of bearing.

As seen, the design that prevents shaft current of existing rotor can not solve the problem that produces oscillating voltage, and bearing still exists impaired easily, the problem that useful life is not long.

Summary of the invention

Main purpose of the present utility model provides a kind of rotor that prevents that effectively oscillating voltage from producing.

Another purpose of the present utility model provides the bearing long motor in useful life on a kind of armature spindle.

For realizing main purpose of the present utility model, the rotor that the utility model provides has rotor core, and armature spindle is installed in the rotor core, be set with at least one bearing on the armature spindle, wherein, also be set with at least one insulating case on the armature spindle, bearing holder (housing, cover) is contained in outside the insulating case.

By such scheme as seen, because bearing holder (housing, cover) is contained on the insulating case, and insulating case is sleeved on the armature spindle, like this, bearing does not directly contact with armature spindle, and insulating case has cut off being electrically connected between armature spindle and the bearing, also just cut off the RLC oscillation circuit, effectively avoid the formation of oscillating voltage, the infringement of avoiding oscillating voltage that bearing is caused, the useful life of prolongation bearing.

A preferred scheme is that the axial length of insulating case is more than or equal to the axial length of bearing.Like this, can effectively avoid the physical connection between armature spindle and the bearing, more effectively cut off the RLC oscillation circuit, avoid the generation of oscillating voltage.

Further scheme is, also is set with at least one back-up ring on the armature spindle, and back-up ring is positioned at insulating case near a side of rotor core.

This shows, by back-up ring insulating case is positioned, prevent that insulating case from sliding at armature spindle, the realization insulating case is relative fixing with armature spindle.

For realizing another purpose of the present utility model, the motor that the utility model provides has housing, stator and rotor are installed in the housing, rotor has rotor core, armature spindle is installed in the rotor core, is set with at least one bearing on the armature spindle, wherein, also be set with at least one insulating case on the armature spindle, bearing holder (housing, cover) is contained in outside the insulating case.

By such scheme as seen, be set with insulating case on the armature spindle of motor, bearing holder (housing, cover) is contained in outside the insulating case; like this bearing not with the armature spindle physical contact, thereby cut off the RLC oscillation circuit, avoid the generation of oscillating voltage; thereby effectively protect bearing, prolong the useful life of bearing.

Description of drawings

Fig. 1 be existing motor partly cut open figure.

Fig. 2 is the structure chart of the utility model rotor embodiment.

Fig. 3 is the partial enlarged drawing of Fig. 2.

Fig. 4 is the cutaway view Amplified image of insulating case among the utility model rotor embodiment.

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment

The end cap that the motor of present embodiment has housing and is positioned at the housing both sides, housing and end cap surround a cavity, and stator and rotor are installed in the cavity, and stator has stator core and is embedded into coil on stator core, rotor is installed in the stator, and can rotate with respect to stator.

Referring to Fig. 2, rotor 30 has rotor core 31, and rotor core 31 is formed by the multi-disc silicon steel plate stacking, and the middle part of rotor core 31 offers through hole, and armature spindle 32 is installed in the through hole, and with the through hole interference fit.During machine operation, rotor core 31 rotates under the magnetic field of the rotation that stator produces, and armature spindle 32 is with rotor core 31 rotations, and outside outputting power.

Be set with two bearings 33,34 on the armature spindle 32, lay respectively at middle part and the end of armature spindle 32.In the present embodiment, bearing 33,34 is not directly to be sleeved on the armature spindle 32.At two of armature spindle 32 suits and bearing 33,34 corresponding

insulating cases

40,50, bearing 33 is sleeved on outside the insulating case 40, and bearing 34 is sleeved on outside the insulating case 50.In the present embodiment, insulating

case

40,50 is made by insulating material, such as macromolecule resin material, plastics, rubber etc.

In the side of insulating case 40 near rotor core 31, also be set with a split washer 35 on the armature spindle 32, and in the side of insulating case 50 near rotor core 31, also be set with a split washer 37 on the armature spindle 32.

Referring to Fig. 4, insulating case 40 has perisporium 41 cylindraceous, and is provided with the extension that extends radially outwardly 42 along insulating case 40 from an end of perisporium 41, and extension 42 is circular, and its internal diameter equates with the internal diameter of perisporium 41.

As seen from Figure 3, the axial length L 1 of bearing 33 is less than the axial length L 2 of insulating case 40, and the axial length L 1 of bearing 33 equals the axial length of insulating case 40 perisporiums 41.Like this, after bearing 33 was sleeved on insulating case 40, bearing 33 was sleeved on outside the perisporium 41 of insulating case 40 fully, avoided bearing 33 and armature spindle 32 that physical contact is arranged, thereby cut off the RLC oscillation circuit, avoided forming oscillating voltage at armature spindle 32.

Also be set with back-up ring 35 on armature spindle 32, the middle part of back-up ring 35 has through hole 36, and back-up ring 35 is split washer, and back-up ring 35 is fixed on the armature spindle 32 by through hole 36.And back-up ring 35 is positioned at the extension 42 of insulating case 40 near a side of rotor core 31, and bearing 33 is positioned at extension 42 away from a side of rotor core 31, and namely back-up ring 35 and bearing 33 lay respectively at the both sides of extension 42.

Like this, can position insulating case 40 by back-up ring 35, prevent that insulating case 40 from sliding at armature spindle 32, thereby avoid bearing 33 to slide.Simultaneously, because back-up ring 35 is made of metal usually, such design can guarantee that back-up ring 35 with bearing 33 physical contacts does not occur, and also avoids flow through bearing 33, back-up ring 35 of shaft current to flow on the armature spindle 32.

In addition, as seen from Figure 3, the outside diameter D2 of insulating case 40 extensions 42 is greater than the outside diameter D1 of back-up ring 35.

The structure of insulating case 50 is identical with the structure of insulating case 40 among Fig. 2, and the matching relationship between back-up ring 37 and insulating case 50, the bearing 34 is also identical with the matching relationship between back-up ring 35, insulating case 40, the bearing 33, repeats no more.

Since bearing 33,34 with armature spindle 32 between be set with

insulating case

40,50; avoid bearing 33,34 directly to contact with armature spindle 32; prevent that electric current is from flow through armature spindle 32 and form shaft current of bearing 33,34; cut off the RLC oscillating circuit; avoid the generation of oscillating voltage; effectively protection bearing 33,34 is not subjected to the infringement of oscillating voltage, prolongs bearing 33, useful life of 34.

Certainly, above-mentioned execution mode only be the utility model preferred embodiment, during practical application, the utility model can also have more variation, for example, needs according to the reality use, the quantity of bearing can change, and for example uses the bearing more than or three, certainly, each bearing all should be sleeved on outside the insulating case, avoids bearing and armature spindle generation physical connection; Perhaps, at the two ends of each insulating case a back-up ring is set all, by two back-up rings an insulating case is positioned, avoid insulating case to slide at armature spindle; Or the axial length of insulating case equals the axial length of bearing, and the outside diameter of back-up ring equals the outside diameter of insulating case extension etc., and such change also can realize protecting the purpose of bearing.

It is emphasized that at last; the utility model is not limited to above-mentioned execution mode, is installed in such as change, the change of back-up ring shape, the bearing of insulating case concrete shape that the variations such as change of position also should be included in the protection range of the utility model claim on the armature spindle.

Claims

1. rotor comprises

Rotor core is equipped with armature spindle in the described rotor core, is set with at least one bearing on the described armature spindle;

It is characterized in that:

Also be set with at least one insulating case on the described armature spindle, described bearing holder (housing, cover) is contained in outside the described insulating case.

2. rotor according to claim 1 is characterized in that:

The axial length of described insulating case is more than or equal to the axial length of described bearing.

3. rotor according to claim 1 and 2 is characterized in that:

Also be set with at least one back-up ring on the described armature spindle, described back-up ring is positioned at described insulating case near a side of described rotor core.

4. rotor according to claim 3 is characterized in that:

The extension that described insulating case has perisporium cylindraceous and extends radially outwardly along described insulating case from an end of described perisporium, described back-up ring is positioned at described extension near a side of described rotor core, and described bearing is positioned at described extension away from a side of described rotor core.

5. rotor according to claim 4 is characterized in that:

The outside diameter of described extension is more than or equal to the outside diameter of described back-up ring.

6. motor comprises

Housing is equipped with stator and rotor in the described housing, described rotor has rotor core, in the described rotor core armature spindle is installed, and is set with at least one bearing on the described armature spindle;

It is characterized in that:

7. motor according to claim 6 is characterized in that:

8. it is characterized in that according to claim 6 or 7 described motors:

9. motor according to claim 8 is characterized in that:

10. motor according to claim 9 is characterized in that: