CN105471140B - Rotor core and motor with it - Google Patents
Rotor core and motor with it Download PDFInfo
- Publication number
- CN105471140B CN105471140B CN201511026580.2A CN201511026580A CN105471140B CN 105471140 B CN105471140 B CN 105471140B CN 201511026580 A CN201511026580 A CN 201511026580A CN 105471140 B CN105471140 B CN 105471140B
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- CN
- China
- Prior art keywords
- rotor core
- magnetic
- magnetic slot
- magnet steel
- diameter end
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- 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.)
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Classifications
-
- 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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- 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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The present invention provides a kind of rotor core and with its motor.Rotor core, comprising: core body;Multiple magnetic slots are opened in the circumferential direction interval setting in core body and along core body, and each magnetic slot extends along the radial direction of core body, and magnetic slot has the first end close to rotor core center and the second end far from rotor core center;Multiple magnet steel are arranged in a one-to-one correspondence in multiple magnetic slots;Wherein, between the first end of a part of magnetic slot in multiple magnetic slots there is spacing distance to form connecting bridge, the first end of another part magnetic slot is connected.It magnetic field can be from the position leakage field of connecting bridge, and in the inventive solutions, the first end of a part of magnetic slot is connected rather than there is spacing distance to form connecting bridge, the connecting bridge that connecting bridge between magnet steel reduces between i.e. magnetic pole reduces, magnetic flux leakage is also reduced therewith, therefore rotor core of the invention and the motor with it can reduce leakage field, improve equipment performance.
Description
Technical field
The present invention relates to power-equipments, in particular to a kind of rotor core and with its motor.
Background technique
As shown in Figure 1, conventional tangential rotor structure includes core body 10 ', magnetic slot 20 ' and magnet steel 30 '.In order to
Reduce leakage field the width between magnetic pole is usually required to be thinned as far as possible, to achieve the effect that limit leakage field.But width is got between magnetic pole
Thin, magnetic interelectrode magnetic leakage is smaller, and every pole magnetic flux is higher, can be improved power of motor density.However high-speed motor reaches 1 when its revolving speed
At~2 ten thousand turns, it is disconnected that the high speed centrifugation power that rotor core and magnet steel generate will lead to rotor core edge weakness (between magnetic pole)
It splits.And have rotor core part i.e. connecting bridge between magnetic pole, the leakage field of connecting bridge can not reduce again, influence motor performance and
Efficiency.
Summary of the invention
The main purpose of the present invention is to provide one kind can reduce the rotor core of leakage field and with its motor.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of rotor core, comprising: iron core sheet
Body;Multiple magnetic slots are opened in the circumferential direction interval setting in core body and along core body, and each magnetic slot is along iron core
The radial direction of ontology extends, and magnetic slot has the first end close to rotor core center and second far from rotor core center
End;Multiple magnet steel are arranged in a one-to-one correspondence in multiple magnetic slots;Wherein, first of a part of magnetic slot in multiple magnetic slots
Between end there is spacing distance to form connecting bridge, the first end of another part magnetic slot is connected.
Further, multiple magnetic slots form multiple groups magnetic slot group, and every group of magnetic slot group includes two magnetic being disposed adjacent
Steel tank forms connecting bridge, the first end of two magnetic slots of every group of magnetic slot group between the first end of the magnetic slot of two adjacent groups
It is connected.
Further, capsulation material is provided between the outer wall of magnet steel and the inner wall of magnetic slot.
Further, each magnetic slot includes: main paragraph, and magnet steel is set in main paragraph;First positioning section, is set to master
The outer edge of body section is simultaneously connected with main paragraph.
Further, the first positioning section has close to first miner diameter end at rotor core center and close to the outer of rotor core
First bigger diameter end of edge, the first miner diameter end are connected with the outer edge of main paragraph, and the width of the first miner diameter end is less than the width of magnet steel
Degree is to form the first stopper section.
Further, the first positioning section is symmetrical arranged along the radial direction of core body.
Further, each magnetic slot further include: the second positioning section, be set to the interior acies of main paragraph and with main paragraph phase
Connection, the second positioning section of two magnetic slots of every group of magnetic slot group is connected, and the magnet steel at the first end of two magnetic slots
The cell wall of slot is connected.
Further, the second positioning section has close to second miner diameter end at rotor core center and close to the outer of rotor core
Second bigger diameter end of edge, the second bigger diameter end are connected with the interior acies of main paragraph, outer rim of second miner diameter end towards rotor core
Direction formed protrusion abut to the outer wall of magnet steel to form the second stopper section.
Further, the second miner diameter end has the inside rim positioned at the two sides of the second stopper section, and inside rim is and rotor iron
The circular arc that the axis hole of core is arranged concentrically.
Further, the second positioning section is symmetrical arranged along the radial direction of core body.
Further, the second stopper section includes arc-shaped contact surface or straight flange contact surface.
According to an aspect of the invention, there is provided a kind of motor, including rotor core, rotor core are above-mentioned rotor
Iron core.
It applies the technical scheme of the present invention, rotor core includes core body, multiple magnetic slots and multiple magnet steel.Multiple magnetic
Steel is arranged in a one-to-one correspondence in multiple magnetic slots.Magnetic slot has close to the first end at rotor core center and far from rotor core
The second end at center there is spacing distance to form connecting bridge between the first end of a part of magnetic slot in multiple magnetic slots, separately
The first end of a part of magnetic slot is connected.Magnetic field can from the position leakage field of connecting bridge, and in the inventive solutions, one
The first end of part magnetic slot is connected rather than there is spacing distance to form connecting bridge, and the connecting bridge between magnet steel reduces i.e. magnetic
The connecting bridge of interpolar reduces, and magnetic flux leakage is also reduced therewith, therefore rotor core of the invention and can with its motor
Leakage field is reduced, equipment performance is improved.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of rotor core according to prior art;
Fig. 2 shows the structural schematic diagrams of rotor core according to the present invention;
Fig. 3 shows partial enlarged view at the A of Fig. 2;
Fig. 4 shows the structural schematic diagram of one embodiment of magnetic slot according to the present invention;And
Fig. 5 shows the structural schematic diagram of another embodiment of magnetic slot according to the present invention.
Wherein, the above drawings include the following reference numerals:
10, core body;20, magnetic slot;20a, connecting bridge;21, main paragraph;22, the first positioning section;23, the first backstop
Portion;24, the second positioning section;25, the second stopper section;30, magnet steel;40, capsulation material;50, the axis hole of rotor core.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figures 2 and 3, the present invention provides a kind of rotor cores.
Specifically, rotor core includes core body 10, multiple magnetic slots 20 and multiple magnet steel 30.Wherein, multiple magnet steel
Slot 20 is opened in core body 10, and multiple magnetic slots 20 are arranged along the circumferential direction interval of core body 10, each magnetic slot
20 along core body 10 radial direction extend.Magnetic slot 20 has close to the first end at rotor core center and far from rotor iron
The second end at core center, the first end and second end of magnetic slot 20.Multiple magnet steel 30 are arranged in a one-to-one correspondence in multiple magnetic slots 20
In, it is arranged in a magnet steel 30 in each magnetic slot 20.Wherein, first of a part of magnetic slot 20 in multiple magnetic slots 20
Between end there is spacing distance to form connecting bridge 20a, the first end of another part magnetic slot 20 is connected.That is, multiple
Among magnetic slot 20, there is connecting bridge 20a between some adjacent magnetic slots 20, there are also the first of some adjacent magnetic slots 20
I.e. two magnetic slots 20 that are connected are held to communicate with each other.
Magnetic field can from the position leakage field of connecting bridge 20a, and in the inventive solutions, the of a part of magnetic slot 20
One end is connected rather than there is spacing distance to form connecting bridge 20a.Connecting bridge 20a between magnet steel 30 reduces between i.e. magnetic pole
Connecting bridge 20a reduces, and magnetic flux leakage is also reduced therewith, therefore rotor core of the invention and can reduce with its motor
Leakage field improves equipment performance.
Meanwhile in the above-described embodiments, connecting bridge 20a is reduced, and rotor core weight reduces, and reduces motor production cost.
Multiple magnetic slots 20 form multiple groups magnetic slot group, and every group of magnetic slot group includes two magnetic slots 20 being disposed adjacent,
Formation connecting bridge 20a between the first end of the magnetic slot 20 of two adjacent groups, the first of two magnetic slots 20 of every group of magnetic slot group
End is connected.As shown in Figures 2 and 3, between the magnetic slot 20 of two adjacent groups there is spacing distance to be not attached to lead to each other, adjacent two
Connecting bridge 20a, the two adjacent magnetic slots 20 in the interval connecting bridge 20a are formed between the first end of the magnetic slot 20 of group.Every group of magnetic
Two magnetic slots 20 in steel tank group are connected to each other, and the first end of two magnetic slots 20 is connected to each other so that two
Magnetic slot 20 is connected.
As shown in Fig. 2, being provided with capsulation material 40 between the outer wall of magnet steel 30 and the inner wall of magnetic slot 20.Capsulation material 40
Non-magnet material can be selected, it is for example non-due to being provided with capsulation material 40 between the outer wall of magnet steel 30 and the inner wall of magnetic slot 20
Permeability magnetic material realizes the fixation of rotor core in radial directions.Improve the whole degree of magnet steel 30 Yu rotor core, structure
It is more stable and firm.
Two magnetic slots 20 in every group of magnetic slot group are connected to each other, the first end of two magnetic slots 20 phase each other
Connection is so that two magnetic slots 20 are connected.Two magnetic slots 20, which are connected, reduces connecting bridge 20a, the connecting bridge of reduction
The part of 20a uses non-magnet material plastic packaging reinforcement structure intensity, is further reduced leakage field, the property of lifting means such as motor
Energy.
As shown in Figure 4 and Figure 5, each magnetic slot 20 includes main paragraph 21 and the first positioning section 22.Wherein, main paragraph 21 leans on
One end of nearly rotor core is interior acies, and the one end of main paragraph 21 far from rotor core is outer edge.Magnet steel 30 is set to main body
In section 21, magnet steel 30 is adapted with main paragraph 21.First positioning section 22 be set to the outer edge of main paragraph 21 and with main paragraph 21
It is connected, the first positioning section 22 is between main paragraph 21 and the outer rim of rotor core.In first positioning section 22 to magnet steel 30 it
Between fill capsulation material 40, with radially fix magnet steel 30 and reduce leakage field.
Preferably, the first positioning section 22 has close to first miner diameter end at rotor core center and close to the outer of rotor core
First bigger diameter end of edge, the first miner diameter end are connected with the outer edge of main paragraph 21, and the width of the first miner diameter end is less than magnet steel 30
Width to form the first stopper section 23.First stopper section 23 is two be oppositely arranged.First stopper section 23 is for fixing magnetic
Steel 30, overall structure are more stable, reliable and safe.First stopper section 23 is to push up shoulder structure, using such top shoulder structure
Magnet steel disconnecting prevention structure, be adapted to high-speed motor.
First positioning section 22 is symmetrical arranged along the radial direction of core body 10.Structure is simple and stablizes, and is also easy to realize.
Further, each magnetic slot 20 further include: the second positioning section 24, be set to the interior acies of main paragraph 21 and with master
Body section 21 is connected, and the second positioning section 24 of two magnetic slots 20 of every group of magnetic slot group is connected, and two magnetic slots 20
The cell wall of magnetic slot 20 at first end is connected.To filling capsulation material 40 between magnet steel 30 in second positioning section 24, with
It radially fixes magnet steel 30 and reduces leakage field.
Second positioning section 24 has the of the second miner diameter end close to rotor core center and the outer rim close to rotor core
Two bigger diameter ends, the second bigger diameter end are connected with the interior acies of main paragraph 21, the second miner diameter end towards rotor core outer rim side
It abuts to the outer wall of magnet steel 30 to protrusion is formed to form the second stopper section 25.Second positioning section 24 have the second miner diameter end and
Second bigger diameter end, the second miner diameter end is close to rotor core center, outer rim of second bigger diameter end close to rotor core.Wherein, second
Bigger diameter end is connected with the interior acies of main paragraph 21, and the second miner diameter end is between the first bigger diameter end and the center of rotor core.
The direction of second miner diameter end towards the outer rim of rotor core forms protrusion, and protrusion is abutted to the outer wall of magnet steel 30 to form the
Two stopper sections 25, i.e. inner projection of the second stopper section 25 towards magnetic slot 20.Second stopper section 25 is whole for fixing magnet steel 30
Body structure is more stable, reliable and safe.The both ends of magnet steel 30 and the mode of peripheral wall capsulation material are fixed, and are reduced for pushing up
The installation angular breadth of magnet steel 30, decreases the leakage field at 30 both ends of magnet steel.
In above-described embodiment, the first stopper section 23 and the second stopper section 25 are salient point positioning, i.e. the first stopper section 23 and the
Two stopper sections 25 are the positioning of protrusion, fixed structure.It is positioned using salient point, guarantees that the arrangement of magnet steel 30 is uniform, make Distribution of Magnetic Field
It is more uniform, while magnet stress or when injection molding, are displaced when preventing magnet steel 30 from magnetizing.
Second miner diameter end has the inside rim positioned at the two sides of the second stopper section 25, and inside rim is the axis hole with rotor core
50 circular arcs being arranged concentrically, structure are easily achieved and stablize.
Preferably, the second positioning section 24 is symmetrical arranged along the radial direction of core body 10.Structure is simple and stablizes, also easy
In realization.
And then ground, the second stopper section 25 include arc-shaped contact surface or straight flange contact surface.Such contact face structure is simple,
The effect for pushing against magnet steel 30 is also preferable.
According to an aspect of the invention, there is provided a kind of motor, including rotor core, rotor core are above-mentioned rotor
Iron core.The connecting bridge part of reduction uses non-magnet material plastic packaging reinforcement structure intensity, is further reduced leakage field, promotes motor
Energy.Connecting bridge 20a is reduced, and magnetic interelectrode magnetic leakage further decreases, and promotes motor performance, improves power of motor density.Such machine
Structure can guarantee high speed (up to ten thousand turns) rotations when it is reliable, while also guarantee motor when running at high speed, power with higher because
Number, performance are more excellent.
Rotor punching structure of the invention builds up iron core, rotates 45 degree between two neighboring rotor core after punching press.It will be more
In the alternate magnetic slot 20 being successively embedded on rotor core of a magnet steel 30, rotor unit is formed.By the rotor after mounting magnetic steel,
Carry out integral molded plastic.Finally by means such as the sub- plastic package dies of integral molded plastic improvement, implements to magnetize, rotor unit is made, it is uniformly distributed
N、S。
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
Magnetic field can from the position leakage field of connecting bridge 20a, and in the inventive solutions, the of a part of magnetic slot 20
One end is connected rather than there is spacing distance to form connecting bridge 20a.Connecting bridge 20a between magnet steel 30 reduces between i.e. magnetic pole
Connecting bridge 20a reduces, and magnetic flux leakage is also reduced therewith, therefore rotor core of the invention and can reduce with its motor
Leakage field improves equipment performance.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of rotor core characterized by comprising
Core body (10);
Multiple magnetic slots (20), are opened on the core body (10) and along the circumferential direction interval of the core body (10)
Setting, each magnetic slot (20) extend along the radial direction of the core body (10), and the magnetic slot (20), which has, leans on
The second end of the first end at nearly rotor core center and the separate rotor core center;
Multiple magnet steel (30) are arranged in a one-to-one correspondence in multiple magnetic slots (20);
Wherein, there is interval distance between the first end of a part of magnetic slot (20) in the multiple magnetic slot (20)
From connecting bridge (20a) is formed, the first end of magnetic slot (20) described in another part is connected;
Each magnetic slot (20) includes:
Main paragraph (21), the magnet steel (30) are set in the main paragraph (21);
First positioning section (22) is set to the outer edge of the main paragraph (21) and is connected with the main paragraph (21);It is described
First positioning section (22) has the outer rim of the first miner diameter end and close rotor core close to the rotor core center
First bigger diameter end, first miner diameter end are connected with the outer edge of the main paragraph (21), the width of first miner diameter end
Less than the width of the magnet steel (30) to form the first stopper section (23);Each magnetic slot (20) further include: the second positioning
Section (24), is set to the interior acies of the main paragraph (21) and is connected with the main paragraph (21), magnetic slot group described in every group
Second positioning sections (24) of two magnetic slots (20) be connected, and described the first of two magnetic slots (20)
The cell wall of the magnetic slot (20) at end is connected;Second positioning section (24) has close to the rotor core center
Second bigger diameter end of the second miner diameter end and the outer rim close to the rotor core, second bigger diameter end and the main paragraph (21)
Interior acies be connected, the direction of outer rim of second miner diameter end towards the rotor core forms protrusion and abuts to described
The outer wall of magnet steel (30) is to form the second stopper section (25);Second stopper section (25) includes straight flange contact surface, the multiple
Magnetic slot (20) forms multiple groups magnetic slot group, and magnetic slot group described in every group includes two magnetic slots (20) being disposed adjacent,
The connecting bridge (20a) is formed between the first end of the magnetic slot (20) of two adjacent groups, magnetic slot group described in every group
The first ends of two magnetic slots (20) be connected;The outer wall of the magnet steel (30) is interior with the magnetic slot (20)
Capsulation material (40) are provided between wall;The connecting bridge (20a) reduced partially uses non-magnet material plastic packaging;The rotor
Iron core is formed by Sheet Metal Forming Technology, and 45 degree are rotated between the two neighboring rotor core;Multiple magnet steel (30) are alternate successively
It is embedded in the magnetic slot (20), forms rotor unit;The rotor core after the magnet steel (30) will be installed integrally to mould
The rotor core of whole plastic packaging is finally magnetized using plastic package die implementation, the rotor unit is made by envelope.
2. rotor core according to claim 1, which is characterized in that first positioning section (22) is along the core body
(10) radial direction is symmetrical arranged.
3. rotor core according to claim 1, which is characterized in that second miner diameter end has to be stopped positioned at described second
The inside rim of the two sides of stopper (25), the inside rim are the circular arc being arranged concentrically with the axis hole (50) of the rotor core.
4. rotor core according to any one of claim 1 to 3, which is characterized in that the second positioning section (24) edge
The radial direction of the core body (10) is symmetrical arranged.
5. a kind of motor, including rotor core, which is characterized in that the rotor core is described in any one of claims 1 to 4
Rotor core.
Priority Applications (1)
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CN201511026580.2A CN105471140B (en) | 2015-12-29 | 2015-12-29 | Rotor core and motor with it |
Applications Claiming Priority (1)
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CN201511026580.2A CN105471140B (en) | 2015-12-29 | 2015-12-29 | Rotor core and motor with it |
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CN105471140A CN105471140A (en) | 2016-04-06 |
CN105471140B true CN105471140B (en) | 2019-08-27 |
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CN201511026580.2A Active CN105471140B (en) | 2015-12-29 | 2015-12-29 | Rotor core and motor with it |
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Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105743251B (en) * | 2016-04-25 | 2018-08-10 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of rotor punching and magneto |
CN106100177B (en) * | 2016-06-20 | 2018-06-15 | 广东威灵电机制造有限公司 | For the rotor of motor and with its motor |
CN107394926B (en) * | 2017-08-30 | 2023-05-26 | 广东威灵电机制造有限公司 | Rotor core and rotor |
CN108105149A (en) * | 2017-12-18 | 2018-06-01 | 广东威灵电机制造有限公司 | Wheel hub, wind wheel and the fan assembly of wind wheel |
CN108631469A (en) * | 2018-05-29 | 2018-10-09 | 广东威灵电机制造有限公司 | Rotor and motor with it |
CN108599420A (en) * | 2018-05-31 | 2018-09-28 | 广东威灵电机制造有限公司 | rotor and motor |
CN110311491B (en) * | 2019-06-27 | 2020-10-30 | 北京理工大学 | High-efficiency permanent magnet motor with low-magnetic-leakage flexible rotor |
CN110277852A (en) * | 2019-07-25 | 2019-09-24 | 东莞市深鹏电子有限公司 | A kind of production method of rotor and rotor |
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CN105720716A (en) * | 2014-12-05 | 2016-06-29 | 莱克电气股份有限公司 | Tangential permanent magnetic rotor and motor |
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US5829120A (en) * | 1993-02-15 | 1998-11-03 | Fanuc, Ltd. | Method for manufacturing a rotor for synchronous motor |
CN202231588U (en) * | 2011-09-22 | 2012-05-23 | 佛山市威灵洗涤电机制造有限公司 | Permanent magnetism motor |
KR20150063217A (en) * | 2013-11-29 | 2015-06-09 | 삼성전자주식회사 | Motor and washing machine having the same |
CN103973003B (en) * | 2014-04-24 | 2018-05-22 | 广东威灵电机制造有限公司 | Rotor punching and with its rotor core, motor |
CN205265394U (en) * | 2015-12-29 | 2016-05-25 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor core and motor comprising same |
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2015
- 2015-12-29 CN CN201511026580.2A patent/CN105471140B/en active Active
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Publication number | Priority date | Publication date | Assignee | Title |
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CN105720716A (en) * | 2014-12-05 | 2016-06-29 | 莱克电气股份有限公司 | Tangential permanent magnetic rotor and motor |
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Effective date of registration: 20190726 Address after: 519070 Guangdong city of Zhuhai Province Qianshan No. six Applicant after: GREE ELECTRIC APPLIANCES Inc. OF ZHUHAI Applicant after: Zhuhai Gree Energy Saving & Refrigerating Technology Resarch Center Co., Ltd. Address before: 519070 Guangdong city of Zhuhai province Rooster Hill Road No. 789 Building 9 (Science Building) Applicant before: Zhuhai Gree Energy Saving & Refrigerating Technology Resarch Center Co., Ltd. |
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