CN104868646A - Rotor lamination and motor with same - Google Patents
Rotor lamination and motor with same Download PDFInfo
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- CN104868646A CN104868646A CN201510316133.4A CN201510316133A CN104868646A CN 104868646 A CN104868646 A CN 104868646A CN 201510316133 A CN201510316133 A CN 201510316133A CN 104868646 A CN104868646 A CN 104868646A
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Abstract
The invention discloses a rotor lamination and a motor with same. The motor comprises a body. The center of the body is provided with an axle hole passing through the body along a thickness direction. The position of the body, adjacent to the outer contour of the body, is provided with a plurality of magnet grooves which are arranged at interval along the periphery. The position on the body, adjacent to the axle hole, is provided with a plurality of through-flow holes which are arranged at interval along the periphery. A rib is formed between any two adjacent through-flow holes. The number of the ribs is not equal to the number of the magnet grooves. The rotor lamination has good damping effect, and can effectively stop vibration of a rotor core from being transmitted to a crankshaft and being further transmitted to a driven component, so as to effectively reduce vibration and noise of the whole device. The rotor lamination is simple in structure, easy in manufacturing, and good in practicality.
Description
Technical field
The present invention relates to Compressor Technology field, more specifically, relate to a kind of rotor pack and the motor with this rotor pack.
Background technology
In the related, embedded permanent magnet motor comprises stator and installs to the rotor on bent axle.Rotor comprises permanent magnet, rotor core, rivet, end plate and balance weight.
Rotor core forms by some rotor packs are stacking, each rotor pack be provided with have pass for bent axle axis hole, for assembling multiple magnet groove of permanent magnet and the multiple rivet holes for dummy rivet.Rivet can be located in rivet hole, and balance weight, end plate and rotor core are fixed into an entirety.Also be provided with multiple through flow hole at rotor pack, between any two adjacent through flow holes, define rib.Wherein, the quantity of magnet groove is identical with the quantity of through flow hole, and rib is roughly radially uniformly distributed.Motor oscillating and the noise with this kind of rotor pack are larger.
Summary of the invention
The application makes the discovery of the following fact and problem and understanding based on inventor:
From motor electromagnetic motivational theory, the fundamental frequency of the electromagnetic force between stator and rotor equals the number of poles that frequency that rotor rotates is multiplied by rotor, i.e. the quantity of the magnet groove of rotor.On bang path, electromagnetic force is ecto-entad transmission on rotor, and is delivered to the outside of driven-mechanism further by bent axle.
Inventor finds: the quantity of rib and distribution etc. have considerable influence to the transmission with electromagnetic force.Specifically, when the quantity of rib is identical with the quantity of the magnet groove of rotor, when rib is uniformly distributed on rotor, each rib can be corresponding diametrically every magnetic bridge with corresponding, electromagnetic force directly can be transmitted along the radial direction of rotor, cause rotor will without any damping to the electromagnetic force in transmittance process.Thus, causing all can be larger by the noise of drive system and vibration.
That is, present inventor finds, in electric machine structure in the related, one of the vibration of motor and the large reason of noise are the causes due to rib.In view of this, present inventor improves rib, thus effectively reduces vibration and the noise of motor.
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of rotor pack, vibration and the noise of the motor be made up of described rotor pack are little.
The invention allows for a kind of motor with above-mentioned rotor pack.
According to the rotor pack of the embodiment of the present invention, comprise: body, the center of described body is provided with along the through axis hole of its thickness direction, on described body, the position of its outline contiguous is provided with along its circumference multiple magnet grooves arranged spaced apart, on described body, the position of contiguous described axis hole is provided with along its circumference multiple through flow holes arranged spaced apart, be formed with a rib between any two adjacent described through flow holes, the quantity of described rib and the quantity of described magnet groove unequal.
According to the rotor pack of the embodiment of the present invention, there is good damping effect, the vibration passing of rotor core effectively can be stoped to bent axle and be passed to driven member further, thus effectively reduce vibration and the noise of whole equipment; This kind of rotor pack 100 structure is simple and be convenient to manufacture, practical.
In addition, rotor pack according to the above embodiment of the present invention can also have following additional technical characteristic:
According to one embodiment of present invention, the quantity of described rib is n, and the quantity of described magnet groove is m, and wherein m can not be divided exactly by n.
According to one embodiment of present invention, multiple described rib is being w along the mean value of the smallest cross-sectional width on respective bearing of trend, wherein, and 0.5≤n × w
2≤ 200.
According to one embodiment of present invention, m=n ± 1.
According to one embodiment of present invention, the quantity of described rib is 5-13.
According to one embodiment of present invention, the smallest cross-sectional width in their extension direction of rib described in any one is 2mm-10mm.
According to one embodiment of present invention, multiple described rib is along the circumferential non-uniform Distribution of described body.
According to one embodiment of present invention, each described rib is formed as " one " font or serpentine respectively.
According to one embodiment of present invention, the bearing of trend of each described rib is respectively without the center of body.
According to one embodiment of present invention, the shape of multiple described rib is identical and cross-sectional width on respective bearing of trend is all equal.
According to one embodiment of present invention, the shape of multiple described rib is identical and the cross-sectional width of at least two described ribs on respective bearing of trend is not identical.
According to one embodiment of present invention, on the bearing of trend of each rib, the cross-sectional width at the two ends of each described rib is greater than the cross-sectional width at the middle part of described rib respectively.
According to the motor of the embodiment of the present invention, comprise the rotor pack according to the embodiment of the present invention.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the structural representation of the rotor pack according to first embodiment of the invention;
Fig. 2 is the structural representation of the rotor pack according to second embodiment of the invention;
Fig. 3 is the structural representation of the rotor pack according to third embodiment of the invention;
Fig. 4 is the structural representation of the rotor pack according to four embodiment of the invention;
Fig. 5 is the structural representation of the rotor pack according to fifth embodiment of the invention.
Reference numeral:
Rotor pack 100;
Body 10;
Axis hole 101; Magnet groove 102; Through flow hole 103; Rivet hole 104; Every magnetic bridge 105; Rib 106.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The rotor pack according to the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Shown in Fig. 5, the rotor pack 100 according to the embodiment of the present invention comprises body 10.The center of body 10 is provided with the axis hole 101 of the through body 10 of thickness direction along body 10.On body 10, the position of its outline contiguous is provided with along the circumference of body 10 multiple magnet grooves 102 arranged spaced apart.On body 10, the position of contiguous axis hole 101 is provided with along the circumference of body 10 multiple through flow holes 103 arranged spaced apart.Be formed with a rib 106 between any two adjacent through flow holes 103, the quantity of rib 106 and the quantity of magnet groove 102 unequal.
In other words, the rotor pack 100 according to the embodiment of the present invention comprises body 10, and the center of body 10 is provided with axis hole 101, the upper surface of the through body 10 of axis hole 101 and lower surface.Body 10 is provided with multiple magnet groove 102 and multiple through flow hole 103, and the circumference of multiple magnet grooves 102 respectively along body 10 is spaced apart, is formed every magnetic bridge 105 between two adjacent magnet grooves 102.The circumference of multiple through flow holes 103 respectively along body 10 is spaced apart.The outline that multiple magnet groove 102 is respectively adjacent to body 10 is arranged, and multiple oil through 103 is respectively adjacent to axis hole 101 and arranges.
Be formed with a rib 106 between any two adjacent through flow holes 103, between any two adjacent ribs 106, there is a through flow hole 103.The quantity of rib 106 and the quantity of magnet groove 102 unequal.Thus, have at least a rib 106 with every magnetic bridge 105 no longer diametrically opposed should, the radial ecto-entad straight line no longer along rotor transmits by electromagnetic force, and transfer route is more tortuous, thus can have certain damping to the transmission of electromagnetic force.
Thus, according to the rotor pack 100 of the embodiment of the present invention, the quantity of rib 106 and the quantity of magnet groove 102 unequal, make rotor pack 100 can have good damping effect, the vibration passing of rotor core effectively can be stoped to bent axle and be passed to driven member further, thus effectively reducing vibration and the noise of whole equipment; This kind of rotor pack 100 structure is simple and be convenient to manufacture, practical.
For convenience of describing, suppose that the quantity of rib 106 is n, the quantity of magnet groove 102 is m.According to some embodiments of the present invention, m can not be divided exactly by n.That is, the quantity of magnet groove 102 is not the integral multiple of the quantity of rib 106.Thus, the probability that the rib 106 on rotor pack 100 is corresponding diametrically with magnetic stripe groove 102 is little, the good damping effect of rotor pack 100.
Preferably, in some embodiments of the invention, m=n ± 1.That is, the quantity of magnet groove 102 can be more than the quantity of rib 106 one or few one.This kind of rotor pack 100 structural modification is little, and through-flow performance can not be a greater impact, and the property retention of rotor pack 100 is good.
According to some embodiments of the present invention, multiple rib 106 is being w along the mean value of the smallest cross-sectional width on respective bearing of trend, wherein, and 0.5≤n × w
2≤ 200.The rib 106 met on the rotor pack 100 of this relational expression had both had certain intensity, also had certain elasticity.
Wherein, in correlation technique known for inventor, rib 106 smallest cross-sectional width is in their extension direction greater than 10mm usually.Now, the wider width of rib, this will be conducive to the transmission vibrated, and damping is poor.That is, present inventor finds, the width of rib 106 also the vibration of motor and noise can produce certain impact.
Present inventor surprisingly finds, when multiple rib 106 is when being arranged in the scope of 2 to 10 millimeters along the mean value w of the smallest cross-sectional width on respective bearing of trend, the intensity of rotor pack 100 entirety can be ensured, good damping can be had again, have this rotor pack 100 motor long service life and vibration and noise little.
In addition, consider that motor pole number generally changes in the scope of 4 to 10, the quantity of the rib on the rotor pack 100 in the application is arranged on 5-13 by inventor.Thus, both can ensure damping, and the quantity of magnet groove 102 can not be made again too much, manufacture also more convenient.
Below in conjunction with specific embodiment, the rotor pack 100 according to the embodiment of the present invention is described in detail.
Embodiment 1
Fig. 1 shows a kind of rotor pack 100 according to the embodiment of the present invention.As shown in Figure 1, rotor pack 100 is provided with axis hole 101, through flow hole 103, rivet hole 104 and magnet groove 102.
Axis hole 101 is one and is located at the center of rotor pack 100, and axis hole 101, through flow hole 103, rivet hole 104 and magnet groove 102 are along radial direction (namely away from the direction of axis hole 101) distribution from inside to outside of rotor pack 100.The axis hole 101 of through flow hole 103 adjacent rotor lamination 100 is arranged, and the outline of magnet groove 102 adjacent rotor lamination 100 is arranged, and rivet hole 104 is roughly between through flow hole 103 and magnet groove 102.
Through flow hole 103, rivet hole 104 and magnet groove 102 are respectively multiple, and multiple through flow hole 103, multiple rivet hole 104 and multiple magnet groove 102 are respectively along the spaced apart setting of circumference of rotor pack 100.Wherein multiple rivet hole 104 and multiple magnet groove 102 are evenly arranged along the circumference of rotor pack 100 respectively.
Each magnet groove 102 roughly rectangularity, is formed every magnetic bridge 105 between any two adjacent magnet grooves 102, extends every the direction of magnetic bridge 105 towards axis hole 101.Namely roughly extend along the radial direction of body 10 every magnetic bridge 105.Each rivet hole 104 is roughly closed circular hole.Axis hole 101 is roughly in the circular hole closed, and the center of circle of axis hole 101 is through the center of rotor pack 100.Each through flow hole 103 is roughly in the scallop hole closed.
Specifically, the edge, side towards axis hole 101 of each through flow hole 103 is formed as arc, simultaneously the edge, side of the axis hole dorsad 101 of each through flow hole 103 is also formed as arc, and is greater than the radius of curvature at the edge, side of axis hole 101 dorsad towards the radius of curvature at the edge, side of axis hole 101.In the present embodiment, the edge, side towards endoporus 101 of each through flow hole 103 is isocentric circular arc with the edge, side of endoporus 101 dorsad.
Be formed with rib 106 between any two adjacent through flow holes 103, multiple rib 106 is uniformly distributed along the circumference of body 10.That is, the distance at the institute interval between any two adjacent ribs 106 is equal, and namely the size that extends in the circumference of body 10 of multiple through flow hole 103 is equal.Here, it should be noted that, multiple rib 106 also can uneven distribution along the circumference of body 10.Thus, the damping of rotor pack 100 can be improved further.
Each rib 106 extends along the radial direction of body 10, each rib 106 bearing of trend through the center of body 10.Wherein, the shape of multiple rib 106 is identical, and the cross-sectional width D on respective bearing of trend is all equal for multiple rib 106.Here, it should be noted that, due to rib 106 along respective bearing of trend can be formed as sectional dimension change shape.Therefore, when comparing the cross-sectional width D of two ribs 106 on respective bearing of trend, be with two ribs 106 respectively cut by two planes equal with the centre distance of body 10 after the sectional dimension that formed for comparison other.
When each rib 106 is formed as the constant shape of sectional dimension on respective bearing of trend, then, on the bearing of trend along rib 106, the sectional dimension of each rib 106 is all identical.When each rib 106 is formed as the shape of sectional dimension change on respective bearing of trend, then the sectional dimension of each rib 106 can be different.
Wherein, in the present embodiment, each rib 106 becomes " one " font to extend respectively, and namely the bearing of trend of each rib 106 is formed as straight line, and this passes straight through the center of body 10.Wherein, for each rib 106, the cross-sectional width D at the two ends of rib 106 is greater than the cross-sectional width D at the middle part of this rib.
In other words, rib 106 have contiguous axis hole 101 one end (namely inner), away from axis hole 101 one end (i.e. outer end) and establish middle part between these sides.On the bearing of trend of rib 106, the cross-sectional width D of the inner of rib 106 is greater than the cross-sectional width D at the middle part of this rib 106, and the cross-sectional width D of the outer end of rib 106 is greater than the cross-sectional width D at the middle part of this rib 106.
Thus, rib 106 can be formed as the structure of similar dumbbell shape, and two ends and the body 10 of rib 106 are connected firmly, and the middle part of rib 106 can have good damping simultaneously.
In the present embodiment, m=6, n=5, namely the quantity of magnet groove 102 is 6, and the quantity of rib 106 is 5, few one of the quantity of the number ratio magnet groove 102 of rib 106, m=n+1.The damping of the rotor pack 100 of the present embodiment is good.
Further, because the shape of the multiple ribs 106 in the present embodiment is identical and size is equal.Therefore, multiple rib 106 is being the minimum value of any one rib cross-sectional width D in their extension direction along the mean value w of the smallest cross-sectional width on respective bearing of trend.Specifically in the present embodiment, each rib 106 all extends along the radial direction of body 10, namely multiple rib 106 is being the minimum value of any one rib cross-sectional width D diametrically along the mean value w of the smallest cross-sectional width on respective bearing of trend, is also the minimum range at institute interval between any two adjacent through flow holes 103.
Wherein, relational expression is met between n and w: 0.5≤n × w
2≤ 200.In the present embodiment, n=5, w=2mm.The damping of rotor pack 100 is good and not fragile.
Embodiment 2
Fig. 2 shows the second rotor pack 100 according to the embodiment of the present invention.Rotor pack 100 in the present embodiment is roughly the same with the structure of the rotor pack 100 in embodiment 1, and wherein identical parts adopt identical Reference numeral, and difference is, m=n-1.Wherein, the quantity of magnet groove 102 is still 6, and the quantity of rib 106 increases, and is increased to 7 by original 5.The rotor pack 100 of this structure also has good damping.
Embodiment 3
Fig. 3 shows the third rotor pack 100 according to the embodiment of the present invention.Rotor pack 100 in the present embodiment is roughly the same with the structure of the rotor pack 100 in embodiment 1, and wherein identical parts adopt identical Reference numeral, and difference is, each rib 106 is formed as serpentine respectively.That is, each rib 106 no longer radially straight line extends, and the bearing of trend of each rib 106 is formed as S shape.The damping with the rotor pack 100 of this kind of curved configuration improves further.
Here, it should be noted that, serpentine should be interpreted broadly at this, namely can refer to forward serpentine, also can refer to reverse serpentine, namely can refer to a serpentine, also can refer to multiple end to end serpentine.In the present embodiment, each rib 106 is formed as a reverse serpentine respectively.
Embodiment 4
Fig. 4 shows the 4th kind of rotor pack 100 according to the embodiment of the present invention.Rotor pack 100 in the present embodiment is roughly the same with the structure of the rotor pack 100 in embodiment 1, and wherein identical parts adopt identical Reference numeral, and difference is, the bearing of trend of each rib 106 is respectively without the center of body 10.That is, each rib 106 no longer extends along the radial direction of body 10, the bearing of trend of rib 106 and the radial direction θ at a certain angle of body 10.Thus, the damping of rotor pack 100 can be improved further.
Specifically in the present embodiment, the angle theta between the bearing of trend of each rib 106 and the radial direction of body 10 is 48 degree.When being formed as structure in the present embodiment according to the rib 106 on the rotor pack 100 in the embodiment of the present invention, the angle theta between the bearing of trend of each rib 106 and the radial direction of body 10 suitably can be chosen in the scope being less than 90 degree.
Wherein, because rib 106 is located between two through flow holes 103, therefore when the change of shape of rib 106, the shape of through flow hole 106 also can change.As different from Example 1, in the present embodiment, because the radial skew of rib 106 relative to body 10 extends, therefore, two edges of through flow hole 103 are no longer formed as isocentric circular arc, and the shape of through flow hole 103 is formed as similar leg-of-mutton structure.
Embodiment 5
Fig. 5 shows the 5th kind of rotor pack 100 according to the embodiment of the present invention.Rotor pack 100 in the present embodiment is roughly the same with the structure of the rotor pack 100 in embodiment 1, wherein identical parts adopt identical Reference numeral, difference is, the cross-sectional width D on respective bearing of trend of each rib 106 is not identical.
Specifically in the present embodiment, the smallest cross-sectional width of five ribs 106 on respective bearing of trend is respectively 2 millimeters, 3 millimeters, 2.5 millimeters, 3.5 millimeters and 2.8 millimeters.Now, w=2.76 millimeter.The rotor pack 100 of this kind of structure also just has good damping.
In the present embodiment, the cross-sectional width D on respective bearing of trend of each rib 106 is not identical.Be understandable that wherein also to only have the cross-sectional width D of a rib 106 different from the cross-sectional width D of other rib 106, certainly, the quantity of the rib 106 that cross-sectional width D is different also can have two or three etc., be not described in detail at this.
The rotor pack 100 according to the embodiment of the present invention is comprised according to the motor of the embodiment of the present invention.Owing to there is above-mentioned useful technique effect according to the rotor pack of the embodiment of the present invention, therefore according to the motor oscillating of the embodiment of the present invention and noise little.
According to embodiment of the present invention motor other form and operation be known for the person of ordinary skill of the art, be not described in detail at this.
In describing the invention, it will be appreciated that, term " " center ", " length ", " width ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (13)
1. a rotor pack, it is characterized in that, comprise: body, the center of described body is provided with along the through axis hole of its thickness direction, on described body, the position of its outline contiguous is provided with along its circumference multiple magnet grooves arranged spaced apart, on described body, the position of contiguous described axis hole is provided with along its circumference multiple through flow holes arranged spaced apart, is formed with a rib between any two adjacent described through flow holes, the quantity of described rib and the quantity of described magnet groove unequal.
2. rotor pack according to claim 1, is characterized in that, the quantity of described rib is n, and the quantity of described magnet groove is m, and wherein m can not be divided exactly by n.
3. rotor pack according to claim 2, is characterized in that, multiple described rib is being w along the mean value of the smallest cross-sectional width on respective bearing of trend, wherein, and 0.5≤n × w
2≤ 200.
4. rotor pack according to claim 3, is characterized in that, m=n ± 1.
5. rotor pack according to claim 3, is characterized in that, the quantity of described rib is 5-13.
6. rotor pack according to claim 3, is characterized in that, the smallest cross-sectional width in their extension direction of rib described in any one is 2mm-10mm.
7. rotor pack according to claim 1, is characterized in that, multiple described rib is along the circumferential non-uniform Distribution of described body.
8. rotor pack according to claim 1, is characterized in that, each described rib is formed as " one " font or serpentine respectively.
9. rotor pack according to claim 8, is characterized in that, the bearing of trend of each described rib is respectively without the center of body.
10. the rotor pack according to any one of claim 1-9, is characterized in that, the shape of multiple described rib is identical and cross-sectional width on respective bearing of trend is all equal.
11. rotor packs according to any one of claim 1-9, it is characterized in that, the shape of multiple described rib is identical and the cross-sectional width of at least two described ribs on respective bearing of trend is not identical.
12. rotor packs according to any one of claim 1-9, it is characterized in that, on the bearing of trend of each described rib, the cross-sectional width at the two ends of described rib is greater than the cross-sectional width at the middle part of described rib respectively.
13. 1 kinds of motors, is characterized in that, comprise the rotor pack according to any one of claim 1-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510316133.4A CN104868646B (en) | 2015-06-10 | 2015-06-10 | Rotor pack and the motor with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510316133.4A CN104868646B (en) | 2015-06-10 | 2015-06-10 | Rotor pack and the motor with it |
Publications (2)
| Publication Number | Publication Date |
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| CN104868646A true CN104868646A (en) | 2015-08-26 |
| CN104868646B CN104868646B (en) | 2017-07-28 |
Family
ID=53914258
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510316133.4A Active CN104868646B (en) | 2015-06-10 | 2015-06-10 | Rotor pack and the motor with it |
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| Country | Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106533008A (en) * | 2016-12-05 | 2017-03-22 | 广东美芝精密制造有限公司 | Rotor, motor and compressor |
| CN112117848A (en) * | 2019-06-19 | 2020-12-22 | 本田技研工业株式会社 | Rotating electrical machine |
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| CN106533008B (en) * | 2016-12-05 | 2023-11-28 | 广东美芝精密制造有限公司 | Rotor, motor and compressor |
| CN112117848A (en) * | 2019-06-19 | 2020-12-22 | 本田技研工业株式会社 | Rotating electrical machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104868646B (en) | 2017-07-28 |
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