CN105743250B - Permanent magnet synchronous motor - Google Patents
Permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN105743250B CN105743250B CN201610210054.XA CN201610210054A CN105743250B CN 105743250 B CN105743250 B CN 105743250B CN 201610210054 A CN201610210054 A CN 201610210054A CN 105743250 B CN105743250 B CN 105743250B
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- Prior art keywords
- rib
- permanent magnet
- rotor core
- synchronous motor
- width
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
It is an object of the invention to ensure the intensity of rib and reduce leakage magnetic flux.Permanent magnet synchronous motor has：The magnet accepting hole of permanent magnet is formed and is used to be arranged in a manner of being protruded to radially inner side；Positioned at the rotor core of the radially outer peripheral side of magnet accepting hole；The rib of the radially outer peripheral side of side and magnet accepting hole between the magnetic pole of rotor core；And between the magnetic pole of magnet accepting hole and rib side linking part, rib includes：Linking part side rib positioned at linking part side；Rotor core side rib positioned at rotor core side；Central rib between linking part side rib and rotor core side rib, the width of linking part side rib is wider than the width of central rib, the gap on the centrifugation force direction between the gap-ratio permanent magnet and rib on centrifugation force direction between permanent magnet and rotor core is narrow, and permanent magnet by each pole is not divided and is integrally formed in the circumferential.
Description
It application No. is the 201310054278.2, applying date is on 2 20th, 2013 that the application, which is, entitled " permanent
The divisional application of the application of magnet synchronous motor ".
Technical field
The present invention relates to permanent magnet synchronous motors.
Background technology
In permanent magnet synchronous motor, the widely used Interior for being embedded with permanent magnet in the rotor
Permanent Magnet (hereinafter referred to as " IPM ") structure.It is inbuilt permanent in the permanent magnet synchronous motor of IPM structures
Magnet begins to use ferrite lattice that is cheap and can easily raising.
However, the performance of permanent magnet residual magnetic flux density and the two physical quantitys of coercive force represent, ferrite magnetic
The residual magnetic flux density and coercive force of iron are about the 1/3 of neodium magnet.So as to be replaced into iron neodium magnet will be currently being widely used
In the case of oxysome magnet, performance is caused to be substantially reduced.
In patent document 1, following permanent magnetic baried formula rotor is disclosed, wherein, embedment has the receiving of permanent magnet
Hole is substantially character cut in bas-relief shape, and the rotor outer periphery surface side of the accepting hole is spacious and narrow towards rotor internal side diameter.According to patent document
1, by increasing the generation area of magnet flux, and increase the area of core section in the outer radial periphery portion of permanent magnet, so as to
It energetically efficiently uses reluctance torque and realizes the raising of performance.
Existing technical literature
Patent document
Patent document 1：No. 4666726 bulletins of Japanese Patent No.
Problems to be solved by the invention
The permanent magnet synchronous motor of IPM structures keeps permanent magnet with rotor, and therefore, the yoke portion that will be called rib is set
It puts in the peripheral side of permanent magnet accepting hole.
When the rotor rotates, effect has centrifugal force on permanent magnet and rotor core.The centrifugal force becomes bending moment
And it acts on rib.Therefore, it in order to keep not generating the intensity of fracture and deformation during rotation by rib, needs to widen the width of rib
Degree.
On the other hand, there is the leakage magnetic flux without generating torque to rib leakage in the magnetic flux of permanent magnet.The leakage magnetic flux
Amount, which increases to, makes rib magnetic saturation.In other words, it is leakage magnetic flux to lead to the magnetically saturated magnetic flux of rib.Ferrite magnetic is employed in permanent magnet
In the case of the low magnet of the relict flux density of iron etc, before rib magnetic saturation is caused, the leakage of bigger ratio is needed
Magnetic flux, main flux is opposite to be reduced.Therefore, in order to reduce the ratio to rib leakage magnetic flux, the width of constriction rib is needed.
That is, widening the width of rib in order to ensure the intensity of rib and for the ratio for reducing the leakage magnetic flux leaked to rib
And the width of constriction rib is opposite relationship.It therefore,, must in order to ensure the intensity of rib in the structure of the rotor of patent document 1
The width of rib must be widened, leakage magnetic flux increases.
Invention content
It is an object of the invention to ensure the intensity of rib and reduce leakage magnetic flux.
Solution
The permanent magnet synchronous motor of the present invention has：It is formed in a manner of being protruded to radially inner side and permanent magnetic is arranged
The magnet accepting hole of iron；Positioned at the rotor core of the radially outer peripheral side of magnet accepting hole；Between the magnetic pole of rotor core side and
The rib of the radially outer peripheral side of magnet accepting hole；And between the magnetic pole of magnet accepting hole and rib side linking part, rib includes：It is located at
The linking part side rib of linking part side；Rotor core side rib positioned at rotor core side；With positioned at linking part side rib and rotor core
Central rib between side rib, the width of linking part side rib is wider than the width of central rib, between permanent magnet and rotor core from
The gap on centrifugation force direction between gap-ratio permanent magnet and rib on mental and physical efforts direction is narrow, and permanent magnet does not exist by each pole
Divide in circumferential direction and be integrally formed.
Invention effect
In accordance with the invention it is possible to ensure the intensity of rib and reduce leakage magnetic flux.
Description of the drawings
Fig. 1 is the overall diagram of the permanent magnet synchronous motor of the first embodiment of the present invention.
Fig. 2 is the partial sectional view of a pole of the permanent magnet synchronous motor of the first embodiment of the present invention.
Fig. 3 is the partial sectional view of a pole of the permanent magnet synchronous motor of the second embodiment of the present invention.
Stress envelope when Fig. 4 is permanent magnet synchronous motor rotation.
The reference numerals are as follows：
1 rotor
2 rotor cores
3 permanent magnets
4 permanent magnets are inserted into hole
5 axis holes
6 ribs
8 direction of magnetization gaps
11 linking parts
30 stators
31 gaps
41 sides
42 bending points
45th, 46 bending points 42 and the contact point of rotor core 2
Specific embodiment
The embodiment of the present invention is illustrated referring to the drawings.
Embodiment 1
Fig. 1 is the overall diagram of the permanent magnet synchronous motor of the first embodiment of the present invention.Permanent magnet synchronizes electronic
Machine includes rotor 1 and stator 30.Rotor 1 has：The permanent magnet accepting hole 4 formed in a manner of being protruded to radially inner side；Position
In the rotor core 2 of the radially outer peripheral side of permanent magnet accepting hole 4；And side and permanent magnet between the magnetic pole of rotor core 2
The rib 6 of the radially outer peripheral side of accepting hole 4.
Fig. 2 is the partial sectional view of a pole of the permanent magnet synchronous motor of the first embodiment of the present invention.Forever
Permanent magnet 3 is equipped on long magnet accepting hole 4.Permanent magnet accepting hole 4 and the permanent magnet accepting hole 4 of adjacent pole are by even
Knot 11 links.
In general, from the magnetic flux that permanent magnet 3 generates through rotor core 2, via the space between rotor 1 and stator 30
(hereinafter referred to as " gap 31 ".) 31 penetrated to stator 30, so as to generate torque.The magnetic flux of the generation of the torque is contributed to be referred to as
Main flux or useful flux.
On the other hand, compared with gap 31, magnetic resistance leaks the magnetic flux of the permanent magnet abutted with rib 6 to relatively small rib 6,
Do not generate torque.Therefore, leakage magnetic flux is known as to the magnetic flux for being produced without helping of torque.
When rib 6 is because leakage magnetic flux during magnetic saturation, become the magnetic resistance with 31 same degree of gap.That is, when leakage field leads to one
When determining level, remaining magnetic flux is the main flux through gap 31.
Permanent magnet 3 by each pole is not divided and is integrally formed in the circumferential, and each pole is curved at least two in the circumferential
Bent point 42a, 42b.Side 41a, 41b are using bending point 42a, 42b as beginning, towards the direction vertical with the direction of magnetization and magnetic pole
End side extends.
Here, between the magnetic pole of permanent magnet accepting hole 4 side end, the permanent magnet accepting hole 4 of magnetic pole center side
The length (hereinafter referred to as " width of rib 6b ") of periphery side end to the end of rotor 1 is L1, and the permanent magnet of side is received between magnetic pole
The length (hereinafter referred to as " width of rib 6c ") for holding periphery side end to the periphery side of rotor 1 in hole 4 is L2；Rib 6 straight
The length of the periphery side end of the permanent magnet accepting hole 4 at the midpoint on line direction to the periphery side of rotor 1 is (hereinafter referred to as
" width of rib 6a ") it is L0.
When rotor 1 rotates, permanent magnet 3 and the effect of rotor core 2 have centrifugal force.Relative to the centrifugal force, positioned at two
The linking part 11 at end plays a role as fulcrum, and the rib 6 positioned at both ends plays a role as beam.Rib 6c and rib 6a, 6b phase
Than close to the linking part 11 as fulcrum, the bending moment being applied on rib 6c is bigger than rib 6a, 6b.Therefore, as shown in figure 4,
Stress concentration at rib 6c is bigger than rib 6a.
In the present embodiment, according to the distribution for the bending moment for acting on rib 6, make width of the width L2 than rib 6a of rib 6c
L0 wide, so as to make the rigidity of rib 6c higher than rib 6a.
On the other hand, rib 6b is located at the position linked with rotor core 2, therefore, width change dramatically.Therefore, stress collection
In near rib 6b, part applies high stress.Therefore, as shown in figure 4, the stress concentration at rib 6b is than rib 6a biggers.
Therefore, in the present embodiment, due to making the width L1 of rib 6b than the width L0 wide of rib 6a, therefore, it is possible to prevent rib 6
Shape change dramatically, avoid stress concentration.
In this way, the width of rib 6 is adjusted according to the power for acting on rib 6, it is necessary whole with Shangdi broadening rib 6 thus, it is possible to avoid
Width, with rib 6 it is of same size compared with, the ratio of leakage magnetic flux can be reduced.
It it should be noted that can be only with the width L2 ratios of the width L1 of rib 6b the width L0 wide than rib 6a and rib 6c
Any one of width L0 wide of rib 6a.
And then the magnetic of the permanent magnet accepting hole 4 protruded to radially inner side used in the present embodiment and rectilinear form
Iron accepting hole is compared, big in the diametrical width of rotor core 2.Therefore, between rotor core 2 and rib 6, radially
Width change dramatically, therefore, stress concentration near 6b.Therefore, in the present embodiment, make width of the width L1 than rib 6c of rib 6b
L2 wide, make the area A1 of rib 6 from the midpoint of the rectilinear direction of rib 6 to magnetic pole center side than the rectilinear direction of rib 6 midpoint to
The area A2 of the rib 6 of side is big between magnetic pole.
And then between the magnetic pole of permanent magnet accepting hole 4 side end, by make magnetic pole center side become radius R1 circle
Arc, side becomes the circular arc of radius R2 between making magnetic pole, so as to adjust the width of rib 6 according to bending moment and stress concentration.
In addition, by making the aggregate value of radius R1 and radius R2 smaller than the thickness T2 in the direction of magnetization of magnet, Neng Gou
Rib 6 sets straight line portion, so as to avoid the stress concentration to rib 6a.
In addition, on rotor 1 and the radially outer peripheral side of rotor core 2 be equipped with protruding portion 12.By setting protruding portion 12, energy
The width L1 of enough further broadening rib 6b improves the rigidity of the rib 6b of stress concentration.The width of the radially outer peripheral side of protruding portion 12
In less than half of the width L1 of rib 6b, by setting protruding portion 12, avoid stress concentration on rib 6b.
In addition, by setting protruding portion 12, area of core section becomes larger, additionally it is possible to increase reluctance torque.
It should be noted that in order to realize the increase of further reluctance torque, the outer radial periphery of protruding portion 12 can be made
The width of side rib 6b width L1 more than half.
In addition, rotor core 2 is made of stacked steel plate, powder core or noncrystalline metal for being laminated in the axial direction etc..
In addition, it is the direction vertical with the direction of magnetization and towards the end side of magnetic pole to side 41a, 41b of permanent magnet 3
The situation of the structure of extension is illustrated, but can be able to be the warp architecture being bent in a manner of being protruded to radially inner side.
Alternatively, side 41a, 41b can be made of the multiple sides protruded to radially inner side.
In addition, the bending point 42 of permanent magnet 3 and the contact point 45,46 of rotor core 2 can be made of circular arc, it can also
It is configured to polyline shaped.
In addition, illustrating ferrite lattice as permanent magnet 3, but it is not limited solely to ferrite lattice.
In addition, internally type rotor is illustrated, but can also use outer type rotor.
Embodiment 2
Fig. 3 is the partial sectional view of a pole of the permanent magnet synchronous motor of the second embodiment of the present invention.
The width T1 of the direction of magnetization gap 8a of the central portion 40 of magnetic pole is than the direction of magnetization gap 8b in side 41a, 41b
Width T2 wide.
Centrifugal force is acted on permanent magnet 3, bending moment is generated and acts on rib 6.By making direction of magnetization gap
The width T1 of 8a than the width T2 wide of direction of magnetization gap 8b, make to act on the centrifugal force of the central portion 40 of permanent magnet 3 via
Side 41a, 41b and act in rotor core 2.
Side 41a, 41b are also close to the position of linking part 11 than central portion 40.Therefore, it is possible to weaken because of permanent magnet 3
Central portion 40 centrifugal force caused by act on the bending moment on rib 6.Therefore, because the intensity of rib 6 can have more than needed, because
This, can constriction rib width, reduce the ratio of the leakage magnetic flux leaked to rib 6.
And then by make permanent magnet 3 side 41a, 41b straight length W2 than central portion 40 straight length W1
It is long, so as to increase the ratio close to the permanent magnet 3 at the position of linking part 11.Therefore, it is possible to weaken because of permanent magnet 3
The bending moment of rib 6 is acted on caused by centrifugal force, the ratio of the leakage magnetic flux leaked to rib 6 is reduced so as to constriction rib width
Example.
It should be noted that using making the width T1 of direction of magnetization gap 8a than between the direction of magnetization when can also use different
The width T2 wide of gap 8b, make permanent magnet 3 side 41a, 41b straight length W2 than the straight length W1's long of central portion 40
Structure, and only with one of which.
As described above, permanent magnet synchronous motor of the invention has：In a manner of being protruded to radially inner side
Form and be used to be arranged the magnet accepting hole of permanent magnet；Positioned at the rotor core of the radially outer peripheral side of magnet accepting hole；It is located at
The rib of the radially outer peripheral side of side and magnet accepting hole between the magnetic pole of rotor core；And the side between the magnetic pole of magnet accepting hole and rib
Linking part, rib includes：Linking part side rib positioned at linking part side；Rotor core side rib positioned at rotor core side；With positioned at
Central rib between linking part side rib and rotor core side rib, the width of linking part side rib are wider than the width of central rib.
In addition, in the permanent magnet synchronous motor of the present invention, the width of rotor core side rib is wider than the width of central rib.
In addition, in the permanent magnet synchronous motor of the present invention, the width of rotor core side rib is wider than linking part side rib
Degree is wide.
In addition, in the permanent magnet synchronous motor of the present invention, between the magnetic pole of magnet accepting hole in side end, in magnetic pole
Entreating the shape of side, the shape of side is the aggregate value of the circular arc of radius R2, radius R1 and radius R2 between magnetic pole for the circular arc of radius R1
It is smaller than the direction of magnetization thickness of permanent magnet.
In addition, the diameter that the permanent magnet synchronous motor of the present invention has positioned at rotor core side rib and rotor core is outside
The protruding portion of diameter side.
In addition, in the permanent magnet synchronous motor of the present invention, permanent magnet has the two of central portion and centrally located portion
The side at end, the gap in the direction of magnetization of the gap-ratio side in the direction of magnetization of central portion are big.
In addition, in the permanent magnet synchronous motor of the present invention, permanent magnet has the two of central portion and centrally located portion
The side at end, the length on the direction vertical with the direction of magnetization of side are longer than the straight length of central portion.
Claims (9)
1. a kind of permanent magnet synchronous motor, wherein,
The permanent magnet synchronous motor has：
The magnet accepting hole of permanent magnet is formed and is used to be arranged in a manner of being protruded to radially inner side；
Positioned at the rotor core of the radially outer peripheral side of the magnet accepting hole；
The rib of the radially outer peripheral side of side and the magnet accepting hole between the magnetic pole of the rotor core；With
The linking part of side between the magnetic pole of the magnet accepting hole and the rib,
The rib includes：
Linking part side rib positioned at the linking part side；
Rotor core side rib positioned at the rotor core side；With
Central rib between the linking part side rib and the rotor core side rib,
The width of the linking part side rib is wider than the width of the central rib,
Permanent magnet and the rib described in the gap-ratio on centrifugation force direction between the permanent magnet and the rotor core
Between centrifugation force direction on gap it is narrow,
The permanent magnet by each pole is not divided and is integrally formed in the circumferential, and with central portion and positioned at the central portion
Both ends side,
Described in certain gap-ratio between the permanent magnet and the rotor core in the direction of magnetization of the central portion
Certain gap between the permanent magnet and the rotor core in the direction of magnetization of side is big.
2. permanent magnet synchronous motor according to claim 1, which is characterized in that
The width of the rotor core side rib is wider than the width of the central rib.
3. permanent magnet synchronous motor according to claim 1, which is characterized in that
The linking part side rib and the rotor core side rib are rounded shapes.
4. permanent magnet synchronous motor according to claim 1, which is characterized in that
The permanent magnet at least has bending point at two.
5. permanent magnet synchronous motor according to claim 2, which is characterized in that
The permanent magnet at least has bending point at two.
6. permanent magnet synchronous motor according to any one of claim 1 to 5, which is characterized in that
The width of the rotor core side rib is wider than the width of the linking part side rib.
7. permanent magnet synchronous motor according to any one of claim 1 to 5, which is characterized in that
In the face of the rib side of the magnet accepting hole, the shape of magnetic pole center side is the circular arc of radius R1, side between magnetic pole
Shape be radius R2 circular arc,
The aggregate value of radius R1 and radius R2 is smaller than the thickness in the direction of magnetization of the permanent magnet.
8. permanent magnet synchronous motor according to any one of claim 1 to 5, which is characterized in that
The permanent magnet synchronous motor has protruding portion, and the protruding parts are in the rotor core side rib and the rotor iron
The radial outer diameter side of the heart.
9. permanent magnet synchronous motor according to any one of claim 1 to 5, which is characterized in that
Length on the direction vertical with the direction of magnetization of the side is than the direction vertical with the direction of magnetization of the central portion
On length it is long.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012128786A JP2013255326A (en) | 2012-06-06 | 2012-06-06 | Permanent magnet synchronous machine |
| JP2012-128786 | 2012-06-06 | ||
| CN201310054278.2A CN103475124B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310054278.2A Division CN103475124B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105743250A CN105743250A (en) | 2016-07-06 |
| CN105743250B true CN105743250B (en) | 2018-06-22 |
Family
ID=49799863
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310054278.2A Active CN103475124B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
| CN201610210054.XA Active CN105743250B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310054278.2A Active CN103475124B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2013255326A (en) |
| CN (2) | CN103475124B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014131293A (en) * | 2014-01-23 | 2014-07-10 | Toshiba Corp | Image encoding method and image decoding method |
| JP5571262B2 (en) * | 2014-01-23 | 2014-08-13 | 株式会社東芝 | Image encoding method and image decoding method |
| JP2014131295A (en) * | 2014-01-23 | 2014-07-10 | Toshiba Corp | Image encoding method and image decoding method |
| JP6363034B2 (en) * | 2015-02-27 | 2018-07-25 | 日立アプライアンス株式会社 | Permanent magnet type rotating electric machine and drum type washing machine |
| CN106712342A (en) * | 2015-07-31 | 2017-05-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor and rotor thereof |
| CN105141058B (en) * | 2015-09-07 | 2018-03-30 | 中车株洲电力机车研究所有限公司 | Permanent-magnetic synchronous motor rotor and permagnetic synchronous motor |
| JP2019126102A (en) * | 2016-05-11 | 2019-07-25 | 三菱電機株式会社 | Rotor and rotary electric machine |
| CN113224874B (en) * | 2020-01-21 | 2023-09-22 | 本田技研工业株式会社 | Rotor, method for manufacturing rotor, and rotating electrical machine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000228837A (en) * | 1999-02-05 | 2000-08-15 | Fujitsu General Ltd | Permanent magnet motor |
| JP3874348B2 (en) * | 2002-05-02 | 2007-01-31 | ダイキン工業株式会社 | Brushless DC motor, brushless DC motor driving device, and compressor |
| JP3772819B2 (en) * | 2002-10-08 | 2006-05-10 | 日産自動車株式会社 | Coaxial motor rotor structure |
| JP2004357468A (en) * | 2003-05-30 | 2004-12-16 | Matsushita Electric Ind Co Ltd | Motor |
| JP2005057951A (en) * | 2003-08-07 | 2005-03-03 | Matsushita Electric Ind Co Ltd | Closed electric compressor |
| JP4452488B2 (en) * | 2003-12-03 | 2010-04-21 | アイチエレック株式会社 | Permanent magnet type motor |
| JP4449035B2 (en) * | 2004-03-10 | 2010-04-14 | 日立オートモティブシステムズ株式会社 | Permanent magnet rotating electric machine for electric vehicles |
| JP2006325348A (en) * | 2005-05-19 | 2006-11-30 | Nidec Shibaura Corp | Rotor |
| US7598645B2 (en) * | 2007-05-09 | 2009-10-06 | Uqm Technologies, Inc. | Stress distributing permanent magnet rotor geometry for electric machines |
| JP5506151B2 (en) * | 2007-12-21 | 2014-05-28 | アイチエレック株式会社 | Permanent magnet rotating machine |
-
2012
- 2012-06-06 JP JP2012128786A patent/JP2013255326A/en active Pending
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2013
- 2013-02-20 CN CN201310054278.2A patent/CN103475124B/en active Active
- 2013-02-20 CN CN201610210054.XA patent/CN105743250B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103475124B (en) | 2016-05-04 |
| JP2013255326A (en) | 2013-12-19 |
| CN103475124A (en) | 2013-12-25 |
| CN105743250A (en) | 2016-07-06 |
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Effective date of registration: 20160826 Address after: Hongkong aoteng Plaza No. 8 Chinese Kowloon Linze street 12 floor Applicant after: Johnson Controls Hitachi air conditioning technology (Hongkong) Co., Ltd. Address before: Tokyo, Japan Applicant before: Hitachi Appliances Inc. |
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Effective date of registration: 20180628 Address after: Tokyo, Japan, Japan Patentee after: Hitachi Johnson Controls Air Conditioning Co., Ltd. Address before: Hongkong aoteng Plaza No. 8 Chinese Kowloon Linze street 12 floor Patentee before: Johnson Controls Hitachi air conditioning technology (Hongkong) Co., Ltd. |
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