CN1220319C - Permanent magnetic rotary motor and its compressor with the motor - Google Patents
Permanent magnetic rotary motor and its compressor with the motor Download PDFInfo
- Publication number
- CN1220319C CN1220319C CNB02118383XA CN02118383A CN1220319C CN 1220319 C CN1220319 C CN 1220319C CN B02118383X A CNB02118383X A CN B02118383XA CN 02118383 A CN02118383 A CN 02118383A CN 1220319 C CN1220319 C CN 1220319C
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- CN
- China
- Prior art keywords
- permanent magnet
- tooth
- rotor
- stator
- type electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims abstract description 15
- 238000004378 air conditioning Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 23
- 230000010349 pulsation Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/0085—Prime movers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
-
- 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
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Compressor (AREA)
Abstract
To provide a permanent magnet type dynamo-electric machine which is low in noises and a compressor using it. The permanent magnet type dynamo-electric machine has a stator 5, on which an armature winding in a concentrated winding is executed so as to surround a plurality of teeth 8 formed to a stator core, and a rotor 1, in which permanent magnets 2 are housed in a plurality of permanentmagnet inserting holes formed to the rotor core 3. Arcuate sections and linear sections are formed to the teeth inner circumferential surfaces of the stator core, with 3.7<=(b/a)>=4.9 being established, when the width of the teeth is represented by (b) and the radial thickness of both end sections 8a of the front ends of the teeth by (a).
Description
Technical field
The present invention relates to a kind of permanent magnet type electric rotary machine, the rotor of this permanent magnet type electric rotary machine is equipped with the permanent magnet that (field use) used in some magnetic fields, and especially, the present invention relates to a kind ofly be installed in one as be used for permanent magnet type electric rotary machine on the compressor of air-conditioning equipment, freezer and freezer.
Background technology
Routinely, in these kind magneto rotary magnets, in order to reduce noise, that is, in order to reduce torque pulsation, taked various countermeasures.For example, JP (U)-A-3-106869 (1991) discloses a kind of countermeasure, and is wherein concentric with being formed centrally with rotor core in the increment part, and the two ends of tooth top part are formed straight line, goes so that leave rotor, therefore reduced torque pulsation.
Relating under the above-mentioned situation of routine techniques, going to have reduced torque pulsation although leave rotor by the two ends that make the tooth top part, yet, in order to reduce noise, must significantly reduce torque pulsation, therefore, rotor is left at the two ends that make tooth top part simply and the countermeasure of going is not enough.
Summary of the invention
The purpose of this invention is to provide a kind of permanent magnet type electric rotary machine, this permanent magnet type electric rotary machine has limited noise during its rotation.
For this reason, the invention provides a kind of permanent magnet type electric rotary machine, it comprises a stator and a rotor, in stator, be added to the armature winding of each centralized winding a plurality of on the tooth that forms on the stator core, and around these teeth, and in rotor, each permanent magnet is placed to a plurality of in rotor core in the formed permanent magnet jack, the inner ring surface of each tooth that wherein forms on stator core has at least two clearance plane parts, the gap length of corresponding formation is different between described rotor and different described clearance plane part, reach each tooth is made the relation that satisfies 3.7≤b/a≤4.9, wherein a is each tooth top part two end portions bond thickness in the radial direction, and b is the width that each tooth bottom is divided.
In addition, the invention provides a kind of permanent magnet type electric rotary machine, it comprises a stator and a rotor, in stator, be added to the armature winding of each centralized winding a plurality of on formed tooth on the stator core, and around these teeth, and in rotor, each permanent magnet is placed to a plurality of in rotor core in the formed permanent magnet jack, wherein the inner ring surface of each tooth of stator core is formed and have an arcuate section and a straight line portion, each tooth is made the relation that satisfies 3.7≤b/a≤4.9, and wherein a is each tooth top part two end portions bond thickness in the radial direction, and b is the width that each tooth bottom is divided.
In addition, the invention provides a kind of permanent magnet type electric rotary machine, this permanent magnet type electric rotary machine comprises a stator and a rotor, in stator, the armature winding of each centralized winding is added to many on formed tooth on the stator core, so that around these teeth, and in rotor, each permanent magnet is placed in rotor core in formed many permanent magnet jacks, and wherein each the tooth inner ring surface with stator core forms an arcuate section and a straight line portion, reach each tooth is made the relation that satisfies 3.7≤b/a≤4.9, wherein a is the thickness that each tooth top part two end portions directly makes progress, and b is the width of each tooth, and will be by arcuate section on the stator iron core tooth inner ring surface with respect to the formed angle of rotor axis, selected less than by the facewidth with respect to the formed angle of rotor axis.
When so that mode constitutes permanent magnet type electric rotary machine as mentioned above, optimize the shape of tooth top part, thereby, can provide to have the permanent magnet type electric rotary machine that reduces noise.
Description of drawings
Fig. 1 is the permanent magnet type electric rotary machine cross-sectional configuration that one embodiment of the present of invention are shown;
Fig. 2 relates to the simulation magnetic flux flow graph of the embodiment of the invention;
Fig. 3 shows the table that concerns between the tooth top shape that relates to the embodiment of the invention and the noise; With
Fig. 4 relates to the compressor cross-sectional configuration of the embodiment of the invention.
Embodiment
Below, describe embodiments of the invention in detail with reference to Fig. 1 one Fig. 4.In each accompanying drawing, identical label is represented identical material.In addition, in the present embodiment, illustrational is a kind of four utmost points-six groove permanent magnet type electric rotary machine, yet, the invention is not restricted to this special machine.
Fig. 1 is the cross-sectional configuration that the permanent magnet type electric rotary machine of one embodiment of the invention is shown, Fig. 2 relates to the simulation magnetic flux flow graph of the embodiment of the invention, and Fig. 3 shows the noise in rotary electric machine measurement result that concerns between the tooth top shape that relates to the embodiment of the invention and the noise.
In Fig. 1, permanent magnet type electric rotary machine is made of stator 5 and rotor 1, and the iron core of stator 5 is formed by six gear pieces 8 and a back of tooth 6.In addition, the rotor core 3 in rotor 1 has some holes that are used for embedding permanent magnet, and permanent magnet 2 is embedded in these holes, and in the corresponding groove 7 of stator 5, the armature winding (not shown) of centralized winding is set, so that around tooth 8.In the present embodiment, each inner ring surface of tooth 8 all partly is made of an arcuate section and a straight line, and when the gap length of supposition at the middle body 8b place of each tooth 8 is g1 and the gap length at the two end portions 8a place of each tooth 8 when being g2, the relation establishment of stipulating g1＜g2.In addition, when the axle center of supposition rotor 1 is O, arcuate section AB is α with respect to the angle of axle center O, and facewidth CD is when being β with respect to the angle of axle center O, and the relation of regulation α＜β is set up.
Now, as the problem relevant with permanent magnet type electric rotary machine one of them, enumerated the noise during the rotation, the reason that produces noise is because torque pulsation.Torque pulsation be since in the relevant machine higher harmonic flux produce, and if make magnetic flux distribution in associated machine, that is the cunning that flattens of the magnetic flux distribution in air gap, then torque pulsation can reduce.
When observing magnetic flux flow, as shown in Figure 2, enter the magnetic flux φ of stator 5 from rotor 1 side, from the two end portions 8a and the middle body 8b of tooth top, the joint of each tooth 8 and the iron core back of the body 6 passes through in order.As what will see from above-mentioned Fig. 2, basically there is not magnetic flux to enter from channel opening part 9, and flux concentration is at the two end portions 8a and the middle body 8b place of each tooth top, and pass them and enter, therefore, in order to make magnetic flux distribution in the air gap cunning that flattens, must limit the magnetic flux that (minimizing) enters from the two end portions 8a of each tooth top to a certain extent.To this occasion, in order to reduce torque pulsation, the two end portions 8a of each tooth top leaves rotor 1 and goes, so that reach the relation of g1＜g2, thereby, reduced the magnetic flux that enters from the two ends 8a of each tooth top.Yet only (g1, regulating action g2) is restricted, and noise during rotation can not reduce fully with gas length.
In these cases, the inventor finds, if make the gap magnetic flux distribution cunning that flattens, and suitably makes the two ends 8a of each tooth top be full of magnetic flux simultaneously, and suppresses magnetic flux and enter from each tooth top two ends 8a, then can obtain gratifying result.That is the inventor reaches a conclusion, if optimize the ratio between the width b of thickness in the radial direction that each tooth top two ends 8a engages and each tooth 8, and the gap magnetic flux distribution cunning that flattens then, and torque pulsation can reduce to heavens.
In view of the foregoing, the inventor utilizes the permanent magnet type electric rotary machine with different b/a ratios to test.The noise-measuring result is shown in Figure 3.Show that during its rotation the permanent magnet type electric rotary machine of low noise represents with circles mark, and show that the permanent magnet type electric rotary machine of big noise represents with the mark of intersection.When selected b/a ratio is 3.7≤(b/a)≤4.9 scopes in the time, observe the noise minimizing during the permanent-magnetic electric machine rotation.
From result of upper experiment as can be known, the big reason of noise change is when the b/a ratio surpasses 4.9, because a is little with respect to b, so the magnetic saturation at each tooth top two end portions 8a place promotes high, and the magnetic flux that enters from each tooth top two end portions 8a greatly is restricted, thereby, enter the middle body 8b of the flux concentrating of stator 5 from the side of rotor 1 at each tooth top, this situation disturbance level and smooth magnetic flux distribution.
On the other hand, the big reason of noise change is when the b/a ratio is lower than 3.7, because a is big with respect to b, so the magnetic saturation at each tooth top two end portions 8a place is low, thereby, although the difference of observing owing to gap length between g1 and the g2 causes the difference that enters magnetic flux, the difference that enters magnetic flux between the two end portions 8a of each tooth top and the middle body 8b is big, this situation disturbance level and smooth magnetic flux distribution.
That is when selected b/a ratio is in 3.7≤(b/a)≤4.9 scopes the time, the magnetic flux distribution in each gap is level and smooth, thereby torque pulsation is restricted and thereby has reduced noise.
In addition, as shown in each accompanying drawing, when the inner ring surface of each tooth 8 was made of arcuate section and straight line portion, arcuate section AB was a key factor with respect to the scope of the angle [alpha] in axle center 0.As it is carried out result of experiment several times, when angle [alpha] less than the angle beta of each facewidth DC with respect to axle center O, that is during α＜β, noise further reduces.
Fig. 4 relates to the compressor cross-sectional configuration figure of one embodiment of the invention.Compressor engages formation by making a spirality bridge piece (1ap) 12 with another spirality bridge piece (1ap) 15, and rotatablely move by generation and to be used to make helical member 13 with bent axle 4 rotation carrying out squeeze operation, above-mentioned spirality bridge piece 12 stands upright on the end plate 11 of a helical member 10 of fixing, and another spirality bridge piece 15 stands upright on the end plate 14 of a rotating screw spare 13.By fixedly helical member 10 and rotating screw spare 13 formed discharge chambe 16a, 16b ... in, be positioned at the chamber at ragged edge place in the radial direction and be placed to and rotatablely move two helical members 10 relevant and 13 central authorities, and the volume of this chamber reduces gradually.When the central authorities of discharge chambe 16a and two helical members 10 of 16b arrival and 13 were neighbouring, the two inner Compressed Gas of discharge chambe 16a and 16b was discharged from exhaust outlet 17, and this exhaust outlet 17 is communicated with discharge chambe 16a and 16b.The Compressed Gas of discharging is by a gas passage (not shown) and a framework 18 that is arranged in the fixing helical member 10, arrive the compression container 19 of framework 18 belows, and being discharged into the compressor outside by discharge duct 20, blast pipe 20 is arranged on the side-walls of compressor container 19.In addition, in this compressor, a drive motor 21 is sealed in the compression container 19, and under the rotary speed that inversion device (invertor) (not shown) that be arranged by branch is controlled, rotates, so that carry out squeeze operation.In this compressor, drive motor 21 is the permanent magnet type electric rotary machines that are made of stator 5 and rotor 1.
In addition, label 22 is the armature winding of stator 5, and label 23 is oil grooves, and label 24 is that oilhole and label 25 are sliding bearings.
Compressor is as drive source and year-round operation such as air-conditioning equipment, freezer and freezer, and therefore, compressor is owing to global warming issue needs energy-conservation most important product.When making drive source with permanent magnet type electric rotary machine, because its high efficiency can reach purpose of energy saving, yet, if there is not fully to reduce the noise of permanent magnet type electric rotary machine, so just can not use permanent magnet type electric rotary machine.Yet,,, therefore, can provide a kind of efficient and energy-conservation compressor that reaches owing to solved the environmental problem that has reduced the permanent magnet type electric rotary machine noise when using when making drive source according to permanent magnet type electric rotary machine of the present invention.
When compressor adopts according to the drive source of permanent magnet type electric rotary machine of the present invention as it, when being applied to air-conditioning equipment, can provide a kind of air-conditioning equipment of removing top operational rules (top runnerregulation).
When compressor adopts according to the drive source of permanent magnet type electric rotary machine of the present invention as it, when being applied to electric refrigerator, can provide a kind of electric refrigerator of removing the top operational rules.
When compressor adopts according to the drive source of permanent magnet type electric rotary machine of the present invention as it, when being applied to freezer, can provide a kind of freezer that reaches energy-conservation purpose.
As what illustrated so far, according to the present invention, because the noise of permanent magnet type electric rotary machine during its rotation can reduce, so a kind of permanent magnet type electric rotary machine and a kind of compressor that adopts this to have the permanent magnet type electric rotary machine that reduces noise that reduces noise that have can be provided.
Claims (7)
1. permanent magnet type electric rotary machine, it comprises a stator and a rotor, in stator, be added to the armature winding of each centralized winding a plurality of on the tooth that forms on the stator core, and around these teeth, and in rotor, each permanent magnet is placed to a plurality of in rotor core in the formed permanent magnet jack, the inner ring surface of each tooth that wherein forms on stator core has at least two clearance plane parts, the gap length of corresponding formation is different between described rotor and different described clearance plane part, reach each tooth is made the relation that satisfies 3.7≤b/a≤4.9, wherein a is each tooth top part two end portions bond thickness in the radial direction, and b is the width that each tooth bottom is divided.
2. permanent magnet type electric rotary machine, it comprises a stator and a rotor, in stator, be added to the armature winding of each centralized winding a plurality of on formed tooth on the stator core, and around these teeth, and in rotor, each permanent magnet is placed to a plurality of in rotor core in the formed permanent magnet jack, wherein the inner ring surface of each tooth of stator core is formed and have an arcuate section and a straight line portion, each tooth is made the relation that satisfies 3.7≤b/a≤4.9, wherein a is each tooth top part two end portions bond thickness in the radial direction, and b is the width that each tooth bottom is divided.
3. permanent magnet type electric rotary machine as claimed in claim 2, it is characterized in that,, be chosen to less than the width that divides by described tooth bottom with respect to the formed angle of rotor axis by the arcuate section on the inner ring surface of the tooth that is positioned at stator core with respect to the formed angle of rotor axis.
4. compressor, it comprises one of them described permanent magnet type electric rotary machine as claim 1-3, this permanent magnet type electric rotary machine is as the drive source of compressor.
5. air-conditioning equipment, it comprises compressor as claimed in claim 4.
6. freezer, it comprises compressor as claimed in claim 4.
7. freezer, it comprises compressor as claimed in claim 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001130573A JP2002325410A (en) | 2001-04-27 | 2001-04-27 | Permanent magnet type dynamo-electric machine and compressor using the same |
| JP130573/2001 | 2001-04-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1384588A CN1384588A (en) | 2002-12-11 |
| CN1220319C true CN1220319C (en) | 2005-09-21 |
Family
ID=18978916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB02118383XA Expired - Lifetime CN1220319C (en) | 2001-04-27 | 2002-04-26 | Permanent magnetic rotary motor and its compressor with the motor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2002325410A (en) |
| KR (1) | KR100460726B1 (en) |
| CN (1) | CN1220319C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105191066A (en) * | 2013-06-03 | 2015-12-23 | 三菱电机株式会社 | Synchronous motor |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10314763A1 (en) * | 2003-03-31 | 2004-10-14 | Robert Bosch Gmbh | Electrical machine excited by permanent magnet |
| JP2006230087A (en) | 2005-02-17 | 2006-08-31 | Hitachi Ltd | Electric motor, compressor, and air conditioner |
| JP5259934B2 (en) * | 2006-07-20 | 2013-08-07 | 株式会社日立産機システム | Permanent magnet type rotating electric machine and compressor using the same |
| JP2010115019A (en) * | 2008-11-06 | 2010-05-20 | Nippon Densan Corp | Pump motor |
| KR101056341B1 (en) * | 2009-07-28 | 2011-08-11 | 전자부품연구원 | Permanent Magnet Synchronous Motor for Torque Ripple Reduction |
| BRPI0903281A2 (en) * | 2009-09-04 | 2011-05-10 | Whirlpool Sa | stator blade for an electric motor |
| JP5688055B2 (en) * | 2012-08-10 | 2015-03-25 | ヤマハ発動機株式会社 | Rotating electrical machine |
| CN103762760B (en) * | 2014-01-07 | 2016-07-06 | 广东美芝制冷设备有限公司 | For the motor of rotary compressor and have the rotary compressor of this motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11178298A (en) * | 1997-12-15 | 1999-07-02 | Toshiba Corp | Stator core for permanent magnet-type motor and permanent magnet-type motor |
-
2001
- 2001-04-27 JP JP2001130573A patent/JP2002325410A/en active Pending
-
2002
- 2002-04-26 KR KR10-2002-0022947A patent/KR100460726B1/en not_active IP Right Cessation
- 2002-04-26 CN CNB02118383XA patent/CN1220319C/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105191066A (en) * | 2013-06-03 | 2015-12-23 | 三菱电机株式会社 | Synchronous motor |
| CN105191066B (en) * | 2013-06-03 | 2018-04-17 | 三菱电机株式会社 | Synchronous motor |
| US10601274B2 (en) | 2013-06-03 | 2020-03-24 | Mitsubishi Electric Corporation | 10-pole/9-slot synchronous motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1384588A (en) | 2002-12-11 |
| KR20020083484A (en) | 2002-11-02 |
| KR100460726B1 (en) | 2004-12-08 |
| JP2002325410A (en) | 2002-11-08 |
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Owner name: HITACHI APPLIANCES, INC. Free format text: FORMER OWNER: HITACHI,LTD. Effective date: 20150625 |
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Effective date of registration: 20150625 Address after: Tokyo, Japan Patentee after: Hitachi Appliances Inc. Address before: Tokyo, Japan Patentee before: Hitachi Ltd. |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160913 Address after: Hongkong, China Patentee after: Johnson Controls Hitachi air conditioning technology (Hongkong) Co., Ltd. Address before: Tokyo, Japan Patentee before: Hitachi Appliances Inc. |
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Effective date of registration: 20180712 Address after: Tokyo, Japan Patentee after: Hitachi Johnson Controls Air Conditioning Co., Ltd. Address before: Hongkong, China Patentee before: Johnson Controls Hitachi air conditioning technology (Hongkong) Co., Ltd. |
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Granted publication date: 20050921 |
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