CN105186819B - The rotor endcap of external rotor electric machine and there is its external rotor electric machine - Google Patents

The rotor endcap of external rotor electric machine and there is its external rotor electric machine Download PDF

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Publication number
CN105186819B
CN105186819B CN201410271474.XA CN201410271474A CN105186819B CN 105186819 B CN105186819 B CN 105186819B CN 201410271474 A CN201410271474 A CN 201410271474A CN 105186819 B CN105186819 B CN 105186819B
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China
Prior art keywords
rotor
endcap
rotor endcap
side wall
electric machine
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CN201410271474.XA
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CN105186819A (en
Inventor
杨泾涛
于明湖
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Guangdong Meizhi Compressor Co Ltd
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Guangdong Meizhi Compressor Co Ltd
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Abstract

The invention discloses a kind of rotor endcap of external rotor electric machine, formed with least one oil-through-hole in the rotor endcap, wherein each oil-through-hole deviates from the edge of the centrally directed rotor endcap of the rotor endcap relative to the radial direction of the rotor endcap.According to the rotor endcap of the external rotor electric machine of the present invention, by setting the oil-through-hole of similar blade shape in rotor endcap, so as to reduce the windage and noise when rotor endcap rotates.

Description

The rotor endcap of external rotor electric machine and there is its external rotor electric machine
Technical field
The present invention relates to motor device field, a kind of rotor endcap more particularly, to external rotor electric machine and with its External rotor electric machine.
Background technology
Pointed out in correlation technique, permanent-magnet synchronous external rotor motor, motor stator external diameter is less than rotor internal diameter, and rotor passes through end Lid and axis connection, because the work characteristics of compressor on end cap, it is necessary to open up oil-through-hole, it can both reduce the temperature rise of motor, Also oil area can be increased, however, after having opened oil-through-hole on end cap, rotor rotation can increase windage, reduce power of motor, with And aerodynamic noise is produced, when motor is used in compressor, the performance of compressor will be had adverse effect on, and make compressor With larger noise.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art.Therefore, one object of the present invention It is to propose a kind of rotor endcap of external rotor electric machine, the rotation windage of the rotor endcap is small, and aerodynamic noise is small.
It is another object of the present invention to propose a kind of external rotor electric machine with above-mentioned rotor endcap.
The rotor endcap of external rotor electric machine according to a first aspect of the present invention, formed with least one in the rotor endcap Individual oil-through-hole, wherein each oil-through-hole from the edge of the centrally directed rotor endcap of the rotor endcap relative to institute The radial direction for stating rotor endcap deviates.
According to the rotor endcap of the external rotor electric machine of the present invention, by setting similar blade shape in rotor endcap Oil-through-hole, so as to reduce the windage and noise when rotor endcap rotates.
Specifically, each oil-through-hole includes first to fourth side wall, and the first side wall and the second sidewall exist The rotor endcap is radially spaced apart from each other, and the 3rd side wall is connected to the first side wall and the second sidewall Between one end, the 4th side wall is connected between the first side wall and the other end of the second sidewall.
Alternatively, the first side wall and the second sidewall are respectively one section of circular arc on two concentric circles.
Further, the arc length of the first side wall is less than the arc length of the second sidewall.Thus, gas can be smoothly Oil-through-hole is flowed out, reduces gas windage to caused by rotor endcap, reduces aerodynamic noise.
Yet further, the curvature of the 3rd side wall is less than the curvature of the 4th side wall.Thus, gas can be more Oil-through-hole is smoothly flowed out, reduces gas windage to caused by rotor endcap, reduces aerodynamic noise.
Alternatively, the junction rounding off between first to fourth side wall.
Specifically, the oil-through-hole is uniformly distributed for circumference of the multiple and the multiple oil-through-hole along the rotor endcap.
Further, the quantity of the oil-through-hole is odd number.Thus, rotor endcap is formed as Non-completety symmetry structure, makes The overall structure form of rotor endcap is obtained closer to triangle, so that rotor endcap structure is more stable and with more preferable Rigidity.
Alternatively, the rotor endcap is the frustum cone structure of slab construction or bottom-open.Thus, when rotor endcap is bottom During the unlimited frustum cone structure in portion, gas is bottom-up when passing through rotor endcap, and the lower surface of rotor endcap can play water conservancy diversion Effect so that air-flow is more steady, smoothly flows out, so as to reduce aerodynamic drag and aerodynamic noise.
External rotor electric machine according to a second aspect of the present invention, including external rotor electric machine according to a first aspect of the present invention Rotor endcap.
According to the external rotor electric machine of the present invention, the rotor-end of the external rotor electric machine by setting above-mentioned first aspect Lid, so as to improve the overall performance of external rotor electric machine.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Fig. 1 is the front view of the rotor endcap of external rotor electric machine according to an embodiment of the invention;
Fig. 2 is the front view of the rotor endcap of external rotor electric machine in accordance with another embodiment of the present invention;
Fig. 3 is the upward view that external rotor electric machine according to embodiments of the present invention does not install stator;
Fig. 4 is the upward view of the external rotor electric machine in Fig. 3.
Reference:
1000:External rotor electric machine;
100:Rotor endcap;
1:Oil-through-hole;11:The first side wall;12:Second sidewall;
13:3rd side wall;14:4th side wall;
2:Mounting hole;
200:Stator core;201:Stator tooth;202:Stator slot;203:Armature winding;
300:Machine shaft;
400:Rotor core;401:Permanent magnet.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The rotor-end of the external rotor electric machine 1000 of embodiment according to a first aspect of the present invention is described below with reference to Fig. 1-Fig. 4 Lid 100.
As shown in figure 1, the rotor endcap 100 of the external rotor electric machine 1000 of embodiment according to a first aspect of the present invention.
Specifically, rotor endcap 100 can centered on the vertically extending revolving body member of axis.Such as in Fig. 1 Example in, rotor endcap 100 be bottom-open frustum cone structure, now the wall of rotor endcap 100 be configured to along rotor The radial direction of end cap 100 tilts upward the inclined-plane of extension from outside to inside so that and rotor endcap 100 is formed generally as umbrella shape, thus, when Gas is bottom-up when passing through rotor endcap 100, and the lower surface of rotor endcap 100 can play a part of water conservancy diversion so that air-flow More steadily, smoothly flow out, so as to reduce aerodynamic drag and aerodynamic noise.
Certainly, the invention is not restricted to this, such as in the figure 2 example, rotor endcap 100 can also be slab construction, such as Circular flat plate structure, now the wall of rotor endcap 100 be configured to horizontal-extending from outside to inside along the radial direction of rotor endcap 100 Plane so that rotor endcap 100 is formed generally as horizontally disposed flat board, and the projection of rotor endcap 100 in the horizontal plane For circle.Here, it is necessary to which explanation, the shape of rotor endcap 100 can be set according to actual requirement, preferably to meet to set Meter requires.
Further, formed with least one oil-through-hole 1 in rotor endcap 100.As shown in figures 1 and 3, rotor endcap Run through the wall of rotor endcap 100, certainly, this hair along the vertical direction formed with multiple oil-through-holes 1, each oil-through-hole 1 on 100 Bright not limited to this, each oil-through-hole 1 can also run through rotor endcap 100 along perpendicular to the direction of the wall thickness of rotor endcap 100 Wall, wherein when rotor endcap 100 is slab construction, pass through the structure of the oil-through-hole 1 obtained by above two make It is identical.
Wherein each oil-through-hole 1 is from the edge of the centrally directed rotor endcap 100 of rotor endcap 100 relative to rotor endcap 100 radial direction deviates.Such as in the example of fig. 3, each oil-through-hole 1 is respectively provided with a central configuration line, and oil-through-hole 1 Be configured at central configuration line along rotor endcap 100 circumference respectively to both sides extension extension form, central configuration line with There is certain angle between the radially extending line of rotor endcap 100.
Preferably, central configuration line deviates towards the opposite direction of the direction of rotation of rotor endcap 100.That is, work as When the inner of central configuration line extends to the center of rotor endcap 100, tangent line is made in the inner for crossing central configuration line, and this tangent line is base Directrix, central configuration line are entirely located in the same side of datum line, and when rotor endcap 100 rotates, during datum line is always positioned at The heart constructs the front of line, i.e. central configuration line is always positioned at the rear of datum line.Such as in the example of fig. 3, the shape of oil-through-hole 1 Shape is similar with blade shape, so as to when having gas bottom-up to pass through rotor endcap 100 from oil-through-hole 1, the shape of oil-through-hole 1 Shape can be well adapted for the flow direction of gas, gas more smoothly by rotor endcap 100, is reduced gas to rotor endcap 100 windage and caused noise.Here, it is necessary to which explanation, blade can be understood as involved in field of fluid machinery And blade, such as the blade of fan.
Specifically, when rotor endcap 100 rotates, and rotor endcap 100 is passed through from oil-through-hole 1 when gas is bottom-up When, the gas through oil-through-hole 1 has upwards and along 100 radially outer movement tendency of rotor endcap, and due to gas Inertia and the movement tendency circumferential, opposite with the direction of rotation of rotor endcap 100 along rotor endcap 100 having, when oil-through-hole 1 Shape and fan blade it is similar when, the rotation of rotor endcap 100 can be smoothed out so as to gas similar to the rotation of fan Flow out oil-through-hole 1 on ground, and then reduces gas to windage caused by rotor endcap 100, the aerodynamic noise of reduction rotor endcap 100.
The rotor endcap 100 of external rotor electric machine 1000 according to embodiments of the present invention, by being set in rotor endcap 100 The oil-through-hole 1 of similar blade shape is put, so as to reduce the windage and noise when rotor endcap 100 rotates.
In one embodiment of the invention, oil-through-hole 1 is multiple that circumference of multiple oil-through-holes 1 along rotor endcap 100 is Even distribution.Such as in the example of fig. 3, formed with multiple oil-through-holes 1 in rotor endcap 100, multiple oil-through-holes 1 are in rotor endcap It is uniformly spaced apart from each other in 100 circumference, that is to say, that the angle between two oil-through-holes 1 of arbitrary neighborhood is equal, optional Ground, the shape of multiple oil-through-holes 1 is identical, equal in magnitude, so that multiple oil-through-holes 1 are in similar on the axis of rotor endcap 100 It is centrosymmetrically arranged, that is to say, that the angle of the angle between rotor endcap 100 turns over two oil-through-holes 1 of arbitrary neighborhood Afterwards, can be overlapped with the rotor endcap 100 before not rotating.So, when rotor endcap 100 is revolving body, and ought be formed thereon Have multiple when on its axis being in the oil-through-hole 1 of similar Central Symmetry distribution, rotor endcap 100 is formed like Central Symmetry Part, and then rotor endcap 100 has run stability, good working effect.
Certainly, the invention is not restricted to this, multiple oil-through-holes 1 can not also being arranged circumferentially along rotor endcap 100, For example, multiple oil-through-holes 1 can also be radially spaced arrangement along rotor endcap 100.
Alternatively, the quantity of oil-through-hole 1 is odd number.Such as in the example of fig. 3, formed with five in rotor endcap 100 Oil-through-hole 1, and five rotors are in that similar Central Symmetry is distributed on the axis of rotor endcap 100, thus, the shape of rotor endcap 100 As Non-completety symmetry structure so that the overall structure form of rotor endcap 100 is closer to triangle, so that rotor endcap 100 have preferable stability and rigidity.Certainly, the invention is not restricted to this, according to the size of rotor endcap 100, oil-through-hole 1 Quantity can also be set according to actual requirement, preferably to meet design requirement, such as when the size of rotor endcap 100 is smaller When, the quantity of oil-through-hole 1 can be three, when the size of rotor endcap 100 is larger, the quantity of oil-through-hole 1 can be seven, Nine even more more.
In addition, it is necessary to explanation, " Non-completety symmetry " refers to:When odd number oil-through-hole 1 in rotor endcap 100 During even distribution, i.e., odd number oil-through-hole 1 is in when being distributed similar to Central Symmetry on the axis of rotor endcap 100, does a mistake and turns The plane of the axis of sub- end cap 100, when the plane does not intersect with any oil-through-hole 1, then the logical oil positioned at the plane both sides The quantity in hole 1 certainly will difference so that the overall structure of rotor endcap 100 be similar to triangle have stability principle and With stability, and then cause the rotor endcap 100 with odd number oil-through-hole 1 with preferable rigidity.
Further, reference picture 3, each oil-through-hole 1 include the first side wall 11, second sidewall 12, the 3rd side wall 13 and 4th side wall 14, the first side wall 11 and second sidewall 12 are radially spaced apart from each other rotor endcap 100, and the 3rd side wall 13 connects It is connected on one end (such as A1 ends shown in Fig. 3) of the first side wall 11 and one end (such as A2 shown in Fig. 3 of second sidewall 12 End) between, the 4th side wall 14 is connected to the other end (such as B1 ends shown in Fig. 3) and second sidewall 12 of the first side wall 11 Between the other end (such as B2 ends shown in Fig. 3).
As shown in figure 3, the first side wall 11 and second sidewall 12 be respectively substantially along the circumferentially extending of rotor endcap 100, when turning When sub- end cap 100 is rotated using its center axis as pivot according to a direction, one end of the first side wall 11 is always positioned at it The front of the other end, one end for being always positioned at front of the first side wall 11 is A1 ends, and the first side wall 11 is always positioned at rear One end is B1 ends, and analogously, one end of second sidewall 12 is always positioned at the front of its other end, the position all the time of second sidewall 12 It is A2 ends in the one end in front, one end for being always positioned at rear of second sidewall 12 is B2 ends.
Further, reference picture 3, centrally disposed, neighbouring turn of the second sidewall 12 of the adjacent rotor end cap 100 of the first side wall 11 The edge of sub- end cap 100 is set, and the first side wall 11 and second sidewall 12 be in the radially inside and outside corresponding of rotor endcap 100, the Three side walls 13 and the 4th side wall 14 extend along the inward-outward direction of rotor endcap 100 respectively, and the inner and first of the 3rd side wall 13 The A1 ends of side wall 11 are connected, and the outer end of the 3rd side wall 13 is connected with the A2 ends of second sidewall 12, the inner and the of the 4th side wall 14 The B1 ends of one side wall 11 are connected, and the outer end of the 4th side wall 14 is connected with the B2 ends of second sidewall 12, so as to be revolved when rotor endcap 100 When turning, the 3rd side wall 13 is always positioned at the front of the 4th side wall 14.Thus, the first side wall 11, the 3rd side wall 13, second sidewall 12 It is sequentially connected with the head and the tail of the 4th side wall 14 to be formed in the oil-through-hole 1 for being projected as quadrangle in rotor endcap 100.
Reference picture 3, the first side wall 11 and second sidewall 12 are respectively one section of circular arc on two concentric circles.That is, The first side wall 11 and second sidewall 12 are respectively formed on two concentric circles, and the first side wall 11 and second sidewall 12 are respectively One section of circular arc on the two concentric circles.Specifically, can be first in rotating shaft when constructing the first side wall 11 and second sidewall 12 Two concentric circles of upper work, the center of circle of the preferably two round centers of circle with rotor endcap 100 overlap, then again at two with one heart One section of circular arc is intercepted on circle respectively, and ensures radially inside and outside correspondence of two sections of circular arcs in rotor endcap 100.Thus, it is possible to To the first side wall 11 and second sidewall 12.
Further, the 3rd side wall 13 and the 4th side wall 14 are also respectively one section of circular arc, and the curvature of the 3rd side wall 13 is small In the curvature of the 4th side wall 14.Such as in the example of fig. 3, the center of circle where the 3rd side wall 13 and the 4th side wall 14 can be The distribution circumferentially spaced apart from one another of rotor endcap 100, and the radius of circle where the 3rd side wall 13 is more than where the 4th side wall 14 Round radius, that is to say, that the degree of crook of the 4th side wall 14 is more than the degree of crook of the 3rd side wall 13, and the 3rd side wall 13 with The recessed direction of 4th side wall 14 is consistent with the rotation direction of rotor endcap 100.
Thus, when rotor endcap 100 rotates, and when gas is bottom-up pass through rotor endcap 100 from oil-through-hole 1 when, Because gas has inertia, gas has the fortune circumferential, opposite with the direction of rotation of rotor endcap 100 along rotor endcap 100 Dynamic trend, that is to say, that gas has the movement tendency of the 4th side wall 14 of impact oil-through-hole 1, curved due to the 4th side wall 14 Qu Chengdu is larger, and so as to which the 4th side wall 14 can function well as the effect of water conservancy diversion, gas is smoothly guided to the logical oil of outflow Hole 1, and then reduce gas to windage caused by rotor endcap 100, reduce aerodynamic noise.
Reference picture 3, the arc length of the first side wall 11 is less than the arc length of second sidewall 12, so as to using same with rotor endcap 100 The area of section for the oil-through-hole 1 that the face of cylinder of axle intercepts, along rotor endcap 100 radial direction from inside to outside, have and substantially increase Trend.Thus, when rotor endcap 100 rotates, and when gas is bottom-up pass through rotor endcap 100 from oil-through-hole 1 when, wear Crossing the gas of oil-through-hole 1 has upwards and along 100 radially outer movement tendency of rotor endcap, due to cutting for the outer end of oil-through-hole 1 Face area is larger, so as to comply with the flowing of gas trend well, reduces gas to windage caused by rotor endcap 100, and then Aerodynamic noise can be effectively reduced.
Further, reference picture 1, the junction rounding off between first to fourth side wall 14.That is, the first side The junction of the side wall 13 of wall 11 and the 3rd is rounding off, such as can be round-corner transition, the 3rd side wall 13 and second sidewall 12 Junction be rounding off, such as can be round-corner transition, the junction of the side wall 14 of second sidewall 12 and the 4th is round and smooth mistake Cross, such as can be round-corner transition, the junction of the 4th side wall 14 and the first side wall 11 is also rounding off, such as can be round Angle transition.Thus, the junction for surrounding four side walls of oil-through-hole 1 does not have sharp drift angle, so as to which gas can be with bottom-up Oil-through-hole 1 can smoothly be passed through, further smaller aerodynamic noise.
From the above mentioned, the shape of oil-through-hole 1 can be similar to the blade shape of fan, and when the quantity of oil-through-hole 1 is strange During number so that the rotated versions of rotor endcap 100 are similar to the rotated versions of fan blade, can greatly reduce rotor endcap 100 windage and aerodynamic noise.
The external rotor electric machine 1000 of embodiment according to a second aspect of the present invention, including according to the above-mentioned first aspect of the present invention The rotor endcap 100 of the external rotor electric machine 1000 of embodiment.Wherein, external rotor electric machine 1000 can be that external rotor permanent magnet is same Motor or other kinds of external rotor electric machine are walked, is only illustrated below by taking permagnetic synchronous motor as an example.
Specifically, reference picture 3 and Fig. 4, external rotor electric machine 1000 also include:Stator core 200, armature winding 203, electricity Machine rotating shaft 300, rotor core 400 and permanent magnet 401, wherein, rotor core 400 passes through rotor endcap 100 and machine shaft 300 link together, such as the center of rotor endcap 100 could be formed with mounting hole 2, machine shaft 300 through mounting hole 2 and Together with the inwall interference fit of mounting hole 2, rotor core 400 is formed generally as the cylindrical shape of both ends open and is connected to turn The bottom of sub- end cap 100, rotor endcap 100 limit the chamber of bottom-open, stator core 200 with rotor core 400 jointly It is located in chamber, permanent magnet 401 is arranged on the inner peripheral surface of rotor core 400 or is built in rotor core 400, stator core 200 have stator tooth 201 and a stator slot 202, and armature winding 203 is limited in stator slot 202 and around being located on stator tooth 201.
Further, rotor endcap 100 can be integrally formed with rotor core 400, or split shaping is connected again. When rotor endcap 100 and rotor core 400 are integrally formed, rotor endcap 100 can be by soft magnetic materials with rotor core 400 (such as 45# steel, 10# steel etc.) is made, and rotor endcap 100 can be integrally drawn into rotor core 400 by drawing process Type.
When rotor endcap 100 is connected again with the split of rotor core 400 shaping, that is to say, that when rotor endcap 100 When being linked together with rotor core 400 by way of assembling, rotor endcap 100 can use non-permeable material (such as Stainless steel, copper or aluminium etc.) it is made, to reduce leakage field at rotor endcap 100, and rotor core 400 can be by silicon steel plate stacking Form or be process by soft magnetic materials, at this point it is possible to by rotor endcap 100 and rotor core 400 by welding, be spirally connected or The mode snapped connection is fixed together.
So, after rotor core 400 is connected with rotor endcap 100, it is possible to by rotor endcap 100 by rotor Together with iron core 400 is indirectly connected with machine shaft 300, and the rigidity of rotor core 400 is strengthened simultaneously.
The external rotor electric machine 1000 may be mounted in compressor (not shown), with the compression mechanism into compressor Power is provided, and then completes the compression to refrigerant.Specifically, compressor can include:Housing, compression mechanism and external-rotor-type electricity Machine 1000, compression mechanism are located at the bottom in housing, and external rotor electric machine 1000 is located at the top in housing and is located at compressor The top of structure, compression mechanism have cylinder, crankshaft and piston, and external rotor electric machine 1000 is connected with bent axle to drive bent axle to turn Dynamic, bent axle rotates with piston in the compression chamber of cylinder, so as to be compressed to the refrigerant entered in compression chamber, after compression Refrigerant can be drained into by the exhaust outlet in cylinder part in housing, refrigerant moves and passes through external rotor electric machine upwards 1000, it can finally be discharged from the blast pipe of case top, but not limited to this.
So, compression mechanism compression refrigerant is driven when external rotor electric machine 1000 works, refrigerant after compression is transported upwards It is dynamic and from the oil-through-hole 1 in rotor endcap 100 through when, blade-shaped is shaped as due to oil-through-hole 1, so as to rotor endcap 100 Suffered windage is smaller, and then reduces the aerodynamic noise of motor.Thus, in the case where the area for ensureing oil-through-hole 1 is constant, carry The high efficiency of motor, reduces aerodynamic noise during compressor operating so that the performance of whole compressor is improved.
The shape of rotor endcap 100 can specifically be set according to the geomery of compressor, preferably to meet actual need Ask.Such as when the axial space abundance in compressor, the preferential rotor endcap 100 for using umbrella-shaped structure, umbrella-shaped structure turns Sub- end cap 100 can further reduce the windage and aerodynamic noise of external rotor electric machine 1000, but the rotor endcap of umbrella-shaped structure 100 be the physical dimension that can increase rotor endcap 100, so when being limited by the size of compressor, that is to say, that work as compression During axial space deficiency in machine, the preferential rotor endcap 100 for using plate-like structure, to reduce the structure of rotor endcap 100 Size, and then reduce the overall axial dimension of external rotor electric machine 1000, meet assembling use demand.
External rotor electric machine 1000 according to embodiments of the present invention, by the outer rotor for setting above-mentioned first aspect embodiment The rotor endcap 100 of formula motor 1000, so as to improve the overall performance of external rotor electric machine 1000.
In the description of the invention, it is to be understood that term " " center ", " thickness ", " on ", " under ", " top ", " bottom ", The orientation or position relationship of the instruction such as " interior ", " outer ", " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on Orientation shown in the drawings or position relationship, it is for only for ease of description description of the invention and simplified, rather than instruction or hint institute The device or element of finger must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this hair Bright limitation.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or Implicitly include one or more this feature.In the description of the invention, " multiple " are meant that two or more, Unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally;It can be direct phase Even, it can also be indirectly connected by intermediary, can be that the connection of two element internals or the interaction of two elements are closed System.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood as the case may be Implication.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification Close and combine.

Claims (10)

1. a kind of rotor endcap of external rotor electric machine, it is characterised in that formed with least one logical oil in the rotor endcap Hole, each oil-through-hole run through the rotor endcap, wherein each the oil-through-hole is from the centrally directed of the rotor endcap Deviate relative to the radial direction of the rotor endcap at the edge of the rotor endcap.
2. the rotor endcap of external rotor electric machine according to claim 1, it is characterised in that each oil-through-hole includes First to fourth side wall, the first side wall and the second sidewall are radially spaced apart from each other the rotor endcap, institute State the 3rd side wall to be connected between one end of the first side wall and the second sidewall, the 4th side wall is connected to described Between the other end of one side wall and the second sidewall.
3. the rotor endcap of external rotor electric machine according to claim 2, it is characterised in that the first side wall and described Second sidewall is respectively one section of circular arc on two concentric circles.
4. the rotor endcap of external rotor electric machine according to claim 3, it is characterised in that the arc length of the first side wall Less than the arc length of the second sidewall.
5. the rotor endcap of external rotor electric machine according to claim 2, it is characterised in that the curvature of the 3rd side wall Less than the curvature of the 4th side wall.
6. the rotor endcap of external rotor electric machine according to claim 2, it is characterised in that first to fourth side wall Between junction rounding off.
7. the rotor endcap of external rotor electric machine according to claim 1, it is characterised in that the oil-through-hole to be multiple and Circumference of the multiple oil-through-hole along the rotor endcap is uniformly distributed.
8. the rotor endcap of external rotor electric machine according to claim 7, it is characterised in that the quantity of the oil-through-hole is Odd number.
9. the rotor endcap of the external rotor electric machine according to any one of claim 1-8, it is characterised in that the rotor End cap is the frustum cone structure of slab construction or bottom-open.
10. a kind of external rotor electric machine, it is characterised in that including the external-rotor-type according to any one of claim 1-9 The rotor endcap of motor.
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CN110761967A (en) * 2018-07-27 2020-02-07 广东美芝制冷设备有限公司 Compressor with a compressor housing having a plurality of compressor blades

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CN203967942U (en) * 2014-06-17 2014-11-26 广东美芝制冷设备有限公司 The rotor endcap of external rotor electric machine and the external rotor electric machine with it

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CN102075037A (en) * 2011-01-28 2011-05-25 贺欣机械厂股份有限公司 Assembly structure of motor
CN202014176U (en) * 2011-03-17 2011-10-19 广州市鼎丰机械有限公司 Brushless direct current motor rotor
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