CN105743250A - Permanent Magnet Synchronous Machine - Google Patents
Permanent Magnet Synchronous Machine Download PDFInfo
- Publication number
- CN105743250A CN105743250A CN201610210054.XA CN201610210054A CN105743250A CN 105743250 A CN105743250 A CN 105743250A CN 201610210054 A CN201610210054 A CN 201610210054A CN 105743250 A CN105743250 A CN 105743250A
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- China
- Prior art keywords
- rib
- permanent magnet
- rotor core
- width
- synchronous motor
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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
To reduce leakage magnetic flux while securing strength of a rib. A permanent magnet synchronous machine includes a magnet accommodation hole which is formed projecting inward in a radial direction and in which a permanent magnet is arranged, a rotor core which is positioned on a radially outer peripheral side of the magnet accommodation hole, a rib which is positioned on an inter-pole side of the rotor core and on the radially outer peripheral side of the magnet accommodation hole, and a connection part which is positioned on an inter-pole side of the magnet accommodation hole and rib. The rib comprises a connection part-side rib positioned on the connection part side, a rotor core-side rib positioned on the rotor core side, and a center rib positioned between the connection part-side rib and rotor core-side rib, a width of the connection part-side rib being wider than a width of the center rib.
Description
The divisional application of application that the application is application number is 201310054278.2, the applying date is on February 20th, 2013, denomination of invention is " permanent magnet synchronous motor ".
Technical field
The present invention relates to permanent magnet synchronous motor.
Background technology
In permanent magnet synchronous motor, widely used InteriorPermanentMagnet (hereinafter referred to as " the IPM ") structure being embedded with permanent magnet in the rotor.The permanent magnet buried underground in the permanent magnet synchronous motor of IPM structure begins to use ferrite magnet that is cheap and that can easily raise.
But, performance residual magnetic flux density and the coercive force the two physical quantity of permanent magnet represent, the residual magnetic flux density of ferrite magnet and coercive force are about the 1/3 of neodium magnet.Thus, when by be currently being widely used neodium magnet be replaced into ferrite magnet, cause that performance substantially reduces.
In patent documentation 1, disclosing following permanent magnetic baried formula rotor, wherein, embedment has the accepting hole of permanent magnet for substantially character cut in bas-relief shape, and the side, rotor outer periphery face of this accepting hole is spacious and narrow towards rotor internal side diameter.According to patent documentation 1, by increasing the generation area of Magnet magnetic flux, and increase the area of core section in the outer radial periphery portion of permanent magnet such that it is able to effectively utilize reluctance torque to realize the raising of performance energetically.
Prior art literature
Patent documentation
Patent documentation 1: No. 4666726 publications of Japanese Patent No.
The problem that invention to solve
The permanent magnet synchronous motor rotor of IPM structure keeps permanent magnet, therefore, will be called the yoke portion of rib and is arranged on the outer circumferential side of permanent magnet accepting hole.
When the rotor rotates, on permanent magnet and rotor core, effect has centrifugal force.This centrifugal force becomes bending moment and acts on rib.Therefore, in order to not produce disrumpent feelings and deformation intensity by rib when being kept and being rotated, it is necessary to widen the width of rib.
On the other hand, the magnetic flux of permanent magnet exists the leakage magnetic flux not producing torque to rib leakage.The amount of this leakage magnetic flux increases to and makes rib magnetic saturation.In other words, cause that the magnetically saturated magnetic flux of rib is leakage magnetic flux.When permanent magnet have employed the low density Magnet of the relict flux of ferrite magnet etc, before causing rib magnetic saturation, it is necessary to the leakage magnetic flux of relatively larger ratio, main flux reduces relatively.Therefore, in order to reduce the ratio to rib leakage magnetic flux, it is necessary to the width of constriction rib.
That is, widen the width of rib in order to ensure the intensity of rib and the width of constriction rib is contrary relation for the ratio of leakage magnetic flux that reduces to rib leakage.Therefore, in the structure of the rotor of patent documentation 1, in order to ensure the intensity of rib, it is necessary to widen the width of rib, leakage magnetic flux increases.
Summary of the invention
It is an object of the invention to guarantee the intensity of rib and reduce leakage magnetic flux.
Solution
The permanent magnet synchronous motor of the present invention possesses: to be constituted and to arrange the Magnet accepting hole of permanent magnet in the way of radially inner side protrusion；It is positioned at the rotor core of the outer radial periphery side of Magnet accepting hole；It is positioned at the rib of the outer radial periphery side of side and Magnet accepting hole between the magnetic pole of rotor core；And it being positioned between the magnetic pole of Magnet accepting hole and rib the linking part of side, rib includes: be positioned at the linking part side rib of linking part side；It is positioned at the rotor core side rib of rotor core side；And the central rib between linking part side rib and rotor core side rib, the width width of the width ratio central rib of linking part side rib, the gap on the centrifugal force direction between gap-ratio permanent magnet and rib on centrifugal force direction between permanent magnet and rotor core is narrow, and permanent magnet is not split in the circumferential by each pole and is integrally formed.
Invention effect
In accordance with the invention it is possible to guarantee the intensity of rib and reduce leakage magnetic flux.
Accompanying drawing explanation
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.
Fig. 4 is stress envelope during permanent magnet synchronous motor rotation.
Description of reference numerals is as follows:
1 rotor
2 rotor cores
3 permanent magnets
4 permanent magnets insert hole
5 axis holes
6 ribs
8 direction of magnetization gaps
11 linking parts
30 stators
31 spaces
41 sidepieces
42 bending points
45, the contact point of 46 bending points 42 and rotor core 2
Detailed description of the invention
Referring to accompanying drawing, embodiments of the invention are illustrated.
Embodiment 1
Fig. 1 is the overall diagram of the permanent magnet synchronous motor of the first embodiment of the present invention.Permanent magnet synchronous motor includes rotor 1 and stator 30.Rotor 1 has: by the permanent magnet accepting hole 4 constituted in the way of radially inner side protrusion；It is positioned at the rotor core 2 of the outer radial periphery side of permanent magnet accepting hole 4；And it is positioned at the rib 6 of the outer radial periphery side of side and permanent magnet accepting hole 4 between the magnetic pole of rotor core 2.
Fig. 2 is the partial sectional view of a pole of the permanent magnet synchronous motor of the first embodiment of the present invention.Permanent magnet accepting hole 4 is equipped permanent magnet 3.Permanent magnet accepting hole 4 is linked by linking part 11 with the permanent magnet accepting hole 4 of adjacent pole.
Generally, the magnetic flux produced from permanent magnet 3 passes through rotor core 2, via the space between rotor 1 and stator 30 (hereinafter referred to as " space 31 ".) 31 pass through to stator 30, thus producing torque.The magnetic flux contributing to the generation of this torque is referred to as main flux or useful flux.
On the other hand, the magnetic flux of the permanent magnet adjacent with rib 6 is compared with space 31, and magnetic resistance leaks to relatively small rib 6, does not produce torque.Therefore, the magnetic flux being produced without helping of torque is called leakage magnetic flux.
When rib 6 magnetic saturation because of leakage magnetic flux, become and the magnetic resistance of space 31 same degree.That is, when leakage magnetic flux reaches certain level, remaining magnetic flux is the main flux through space 31.
Permanent magnet 3 is not split in the circumferential by each pole and is integrally formed, and each pole has at least two place bending point 42a, 42b in the circumferential.Sidepiece 41a, 41b, with bending point 42a, 42b for top, extend towards the end side of the direction vertical with the direction of magnetization and magnetic pole.
At this, the end of side between the magnetic pole of permanent magnet accepting hole 4, the length (hereinafter referred to as " width of rib 6b ") of the outer circumferential side end of the permanent magnet accepting hole 4 of magnetic pole center side to the end of rotor 1 is L1, and between magnetic pole, the outer circumferential side end of the permanent magnet accepting hole 4 of side is L2 to the length (hereinafter referred to as " width of rib 6c ") of the periphery side of rotor 1；The outer circumferential side end of the permanent magnet accepting hole 4 at the midpoint in the straight direction of rib 6 is L0 to the length (hereinafter referred to as " width of rib 6a ") of the periphery side of rotor 1.
When rotor 1 rotates, permanent magnet 3 and rotor core 2 effect have centrifugal force.Relative to this centrifugal force, the linking part 11 being positioned at two ends plays a role as fulcrum, and the rib 6 being positioned at two ends plays a role as beam.Rib 6c is close to the linking part 11 as fulcrum compared with rib 6a, 6b, and the bending moment being applied on rib 6c is bigger than rib 6a, 6b.Therefore, as shown in Figure 4, the stress at rib 6c place is concentrated bigger than rib 6a.
In the present embodiment, the distribution according to the bending moment acting on rib 6, make the width L2 of the rib 6c width L0 than rib 6a wide, so that the rigidity of rib 6c is higher than rib 6a.
On the other hand, rib 6b is positioned at the position linked with rotor core 2, and therefore, width sharply changes.Therefore, stress concentrates near rib 6b, and local applies high stress.Therefore, as shown in Figure 4, the stress at rib 6b place is concentrated bigger than rib 6a.
Therefore, in the present embodiment, owing to making the width L1 of the rib 6b width L0 than rib 6a wide, therefore, it is possible to prevent the shape of rib 6 from sharply changing, it is to avoid stress is concentrated.
So, regulate the width of rib 6 according to the power acting on rib 6, it is possible to avoid the necessary width widening rib 6 entirety with Shangdi, compared with identical with the width of rib 6, it is possible to reduce the ratio of leakage magnetic flux.
It should be noted that can any one of the width L2 of and rib 6c wide only with the width L1 of the rib 6b width L0 than the rib 6a width L0 alleviating distention in middle-JIAO than rib 6a.
And then, the permanent magnet accepting hole 4 to radially inner side protrusion adopted in the present embodiment is compared with the Magnet accepting hole of rectilinear form, big at the width diametrically of rotor core 2.Therefore, between rotor core 2 and rib 6, width radially sharply changes, and therefore, near 6b, stress is concentrated.Therefore, in the present embodiment, making the width L1 of the rib 6b width L2 than rib 6c wide, the midpoint making rectilinear direction from rib 6 is bigger than the area A2 of the rib 6 of side between the midpoint of the rectilinear direction of rib 6 to magnetic pole to the area A1 of the rib 6 of magnetic pole center side.
And then, the end of side between the magnetic pole of permanent magnet accepting hole 4, by making magnetic pole center side become the circular arc of radius R1, make side between magnetic pole become the circular arc of radius R2, thus the width according to bending moment and stress Central Regulation rib 6.
It addition, by making radius R1 less than the thickness T2 in the direction of magnetization of Magnet with the aggregate value of radius R2, it is possible to straight line portion is set at rib 6, thus avoiding concentrating to the stress of rib 6a.
It addition, on rotor 1 and the outer radial periphery side of rotor core 2 be provided with protuberance 12.By arranging protuberance 12, it is possible to widen the width L1 of rib 6b further, put forward the rigidity of the rib 6b of high stress concentrations.The width of the outer radial periphery side of protuberance 12 is in less than half of width L1 of rib 6b, by arranging protuberance 12, it is to avoid stress concentrates on rib 6b.
Additionally, by arranging protuberance 12, area of core section becomes big, additionally it is possible to increase reluctance torque.
It should be noted that for the increase realizing further reluctance torque, it is possible to make the width of outer radial periphery side of protuberance 12 in more than half of width L1 of rib 6b.
It addition, rotor core 2 is made up of the stacked steel plate of stacking in the axial direction, powder core or noncrystalline metal etc..
Additionally, be the direction vertical with the direction of magnetization and the situation of structure that the end side towards magnetic pole extends is illustrated, but can be the warp architecture to bend in the way of radially inner side protrusion to sidepiece 41a, 41b of permanent magnet 3.Or, sidepiece 41a, 41b can be made up of the multiple sidepieces protruded to radially inner side.
It addition, the contact point 45,46 of the bending point 42 of permanent magnet 3 and rotor core 2 can be made up of circular arc, it is also possible to be configured to polyline shaped.
Additionally, illustrate ferrite magnet as permanent magnet 3, but it is not limited solely to ferrite magnet.
It addition, internally type rotor is illustrated but it also may 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 part 40 of magnetic pole is wider than the width T2 of the direction of magnetization gap 8b in sidepiece 41a, 41b.
Permanent magnet 3 acts on centrifugal force, produces bending moment and act on rib 6.Wider than the width T2 of direction of magnetization gap 8b by the width T1 that makes direction of magnetization gap 8a, make the centrifugal force acting on the central part 40 of permanent magnet 3 act in rotor core 2 via sidepiece 41a, 41b.
Sidepiece 41a, 41b are also close to the position of linking part 11 than central part 40.Therefore, it is possible to the bending moment acted on rib 6 that the centrifugal force weakening the central part 40 because of permanent magnet 3 causes.Accordingly, because the intensity of rib 6 can be had more than needed, therefore, it is possible to constriction rib width, reduce the ratio of the leakage magnetic flux leaked to rib 6.
And then, longer than the straight length W1 of central part 40 by the straight length W2 making sidepiece 41a, 41b of permanent magnet 3 such that it is able to increase the ratio of the permanent magnet 3 at the position close to linking part 11.Therefore, it is possible to weaken the bending moment acting on rib 6 because the centrifugal force of permanent magnet 3 causes such that it is able to constriction rib width and reduce the ratio of leakage magnetic flux to rib 6 leakage.
It should be noted that, can also adopt and during difference, adopt the structure longer than the straight length W1 of central part 40 for straight length W2 that the width T1 making direction of magnetization gap 8a is wider than the width T2 of direction of magnetization gap 8b, make sidepiece 41a, 41b of permanent magnet 3, and only with one of which.
As described above, the permanent magnet synchronous motor of the present invention possesses: to be constituted and for arranging the Magnet accepting hole of permanent magnet in the way of radially inner side protrusion；It is positioned at the rotor core of the outer radial periphery side of Magnet accepting hole；It is positioned at the rib of the outer radial periphery side of side and Magnet accepting hole between the magnetic pole of rotor core；And it being positioned between the magnetic pole of Magnet accepting hole and rib the linking part of side, rib includes: be positioned at the linking part side rib of linking part side；It is positioned at the rotor core side rib of rotor core side；And the central rib between linking part side rib and rotor core side rib, the width width of the width ratio central rib of linking part side rib.
It addition, in the permanent magnet synchronous motor of the present invention, the width width of the width ratio central rib of rotor core side rib.
Additionally, in the permanent magnet synchronous motor of the present invention, the width width of the width ratio linking part side rib of rotor core side rib.
Additionally, in the permanent magnet synchronous motor of the present invention, between the magnetic pole of Magnet accepting hole in side end, the circular arc being shaped as radius R1 of magnetic pole center side, the circular arc being shaped as radius R2 of side between magnetic pole, radius R1 is less than the direction of magnetization thickness of permanent magnet with the aggregate value of radius R2.
Additionally, the permanent magnet synchronous motor of the present invention possesses the protuberance of the radial outer diameter side being positioned at rotor core side rib and rotor core.
It addition, in the permanent magnet synchronous motor of the present invention, permanent magnet has the sidepiece at the two ends in central part and centrally located portion, the gap in the direction of magnetization of the gap-ratio sidepiece in the direction of magnetization of central part is big.
Additionally, in the permanent magnet synchronous motor of the present invention, permanent magnet has the sidepiece at the two ends in central part and centrally located portion, the straight length of the length ratio central part on the direction vertical with the direction of magnetization of sidepiece is long.
Claims (9)
1. a permanent magnet synchronous motor, wherein,
Described permanent magnet synchronous motor possesses:
To be constituted and for arranging the Magnet accepting hole of permanent magnet in the way of radially inner side protrusion；
It is positioned at the rotor core of the outer radial periphery side of described Magnet accepting hole；
The rib of the outer radial periphery side being positioned between the magnetic pole of described rotor core side and described Magnet accepting hole；With
It is positioned between the magnetic pole of described Magnet accepting hole and described rib the linking part of side,
Described rib includes:
It is positioned at the linking part side rib of described linking part side；
It is positioned at the rotor core side rib of described rotor core side；With
Central rib between described linking part side rib and described rotor core side rib,
The width width of central rib described in the width ratio of described linking part side rib,
Gap on centrifugal force direction between permanent magnet and described rib described in the gap-ratio on centrifugal force direction between described permanent magnet and described rotor core is narrow,
Described permanent magnet is not split in the circumferential by each pole and is integrally formed.
2. permanent magnet synchronous motor according to claim 1, it is characterised in that
The width width of central rib described in the width ratio of described rotor core side rib.
3. permanent magnet synchronous motor according to claim 1, it is characterised in that
Described linking part side rib and described rotor core side rib are rounded shapes.
4. permanent magnet synchronous motor according to claim 1 and 2, it is characterised in that
Described permanent magnet at least has two place's bending points.
5. permanent magnet synchronous motor according to any one of claim 1 to 4, it is characterised in that
The width width of linking part side rib described in the width ratio of described rotor core side rib.
6. permanent magnet synchronous motor according to any one of claim 1 to 5, it is characterised in that
In the face of the described rib side of described Magnet accepting hole, the circular arc being shaped as radius R1 of magnetic pole center side, the circular arc being shaped as radius R2 of side between magnetic pole,
Radius R1 is less than the thickness in the direction of magnetization of described permanent magnet with the aggregate value of radius R2.
7. permanent magnet synchronous motor according to any one of claim 1 to 6, it is characterised in that
Described permanent magnet synchronous motor possesses protuberance, and this protuberance is positioned at the radial outer diameter side of described rotor core side rib and described rotor core.
8. permanent magnet synchronous motor according to any one of claim 1 to 7, it is characterised in that
Described permanent magnet has central part and the sidepiece at the two ends being positioned at described central part,
The gap between described permanent magnet and described rotor core in the direction of magnetization of sidepiece described in the gap-ratio between described permanent magnet and described rotor core in the direction of magnetization of described central part is big.
9. permanent magnet synchronous motor according to any one of claim 1 to 7, it is characterised in that
Described permanent magnet has central part and the sidepiece at the two ends being positioned at described central part,
Length on the direction vertical with the direction of magnetization of central part described in length ratio on the direction vertical with the direction of magnetization of described sidepiece 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 true CN105743250A (en) | 2016-07-06 |
| CN105743250B CN105743250B (en) | 2018-06-22 |
Family
ID=49799863
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610210054.XA Active CN105743250B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
| CN201310054278.2A Active CN103475124B (en) | 2012-06-06 | 2013-02-20 | Permanent magnet synchronous motor |
Family Applications After (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) | CN105743250B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5571262B2 (en) * | 2014-01-23 | 2014-08-13 | 株式会社東芝 | Image encoding method and image decoding method |
| JP2014131293A (en) * | 2014-01-23 | 2014-07-10 | Toshiba Corp | 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 |
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| JP2003324875A (en) * | 2002-05-02 | 2003-11-14 | Daikin Ind Ltd | Brushless dc motor, drive unit for brushless dc motor, and compressor |
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| US20120038236A1 (en) * | 2004-03-10 | 2012-02-16 | Hitachi, Ltd. | Permanent Magnet Rotating Electric Machine and Electric Car Using the Same |
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| JP2000228837A (en) * | 1999-02-05 | 2000-08-15 | Fujitsu General Ltd | Permanent magnet motor |
| JP3772819B2 (en) * | 2002-10-08 | 2006-05-10 | 日産自動車株式会社 | Coaxial motor rotor structure |
| 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 |
| JP5506151B2 (en) * | 2007-12-21 | 2014-05-28 | アイチエレック株式会社 | Permanent magnet rotating machine |
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- 2012-06-06 JP JP2012128786A patent/JP2013255326A/en active Pending
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- 2013-02-20 CN CN201610210054.XA patent/CN105743250B/en active Active
- 2013-02-20 CN CN201310054278.2A patent/CN103475124B/en active Active
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| JP2003324875A (en) * | 2002-05-02 | 2003-11-14 | Daikin Ind Ltd | Brushless dc motor, drive unit for brushless dc motor, and compressor |
| JP2004357468A (en) * | 2003-05-30 | 2004-12-16 | Matsushita Electric Ind Co Ltd | Motor |
| US20120038236A1 (en) * | 2004-03-10 | 2012-02-16 | Hitachi, Ltd. | Permanent Magnet Rotating Electric Machine and Electric Car Using the Same |
| JP2006325348A (en) * | 2005-05-19 | 2006-11-30 | Nidec Shibaura Corp | Rotor |
| US20080278021A1 (en) * | 2007-05-09 | 2008-11-13 | Uqm Technologies, Inc. | Stress Distributing Permanent Magnet Rotor Geometry For Electric Machines |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013255326A (en) | 2013-12-19 |
| CN103475124A (en) | 2013-12-25 |
| CN103475124B (en) | 2016-05-04 |
| CN105743250B (en) | 2018-06-22 |
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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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