CN109104011B - Motor rotor, motor and DC variable frequency compressor - Google Patents
Motor rotor, motor and DC variable frequency compressor Download PDFInfo
- Publication number
- CN109104011B CN109104011B CN201710475668.5A CN201710475668A CN109104011B CN 109104011 B CN109104011 B CN 109104011B CN 201710475668 A CN201710475668 A CN 201710475668A CN 109104011 B CN109104011 B CN 109104011B
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- Prior art keywords
- hole
- rotor
- motor
- refrigerant
- rotating shaft
- 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.)
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- 239000003507 refrigerant Substances 0.000 claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims 2
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000001737 promoting effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 239000002826 coolant Substances 0.000 description 9
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
本发明提供一种电动机转子、电动机以及直流变频压缩机，由于转子铁心上设置的是V型磁铁槽，嵌入的永磁体的用量得到显著提高，从而提高了电动机转矩密度，能够满足电动机高效化、小型化要求，进而改善直流变频压缩机的性能。同时，由于转子铁心上的主、副冷媒通孔配合V型磁铁槽和转轴孔的布置方式，满足了转子机械强度的要求，还能避免由于转子主极磁场磁力线经过冷媒通孔形成闭合回路而导致转子侧磁阻明显增大的问题，从而能够在保证电动机性能和可靠性的前提下尽可能地增大转子冷媒通流面积，促进压缩机中冷媒的循环，并达到冷却转子的目的。
The present invention provides a motor rotor, a motor and a DC variable frequency compressor. Since a V-shaped magnet groove is arranged on the rotor core, the amount of embedded permanent magnets is significantly increased, thereby improving the torque density of the motor, meeting the requirements of high efficiency and miniaturization of the motor, and further improving the performance of the DC variable frequency compressor. At the same time, since the main and auxiliary refrigerant through holes on the rotor core are arranged in accordance with the V-shaped magnet groove and the shaft hole, the requirements of the mechanical strength of the rotor are met, and the problem of a significant increase in the magnetic resistance on the rotor side due to the magnetic field lines of the rotor main pole passing through the refrigerant through hole to form a closed loop can be avoided, thereby increasing the rotor refrigerant flow area as much as possible under the premise of ensuring the performance and reliability of the motor, promoting the circulation of the refrigerant in the compressor, and achieving the purpose of cooling the rotor.
Description
Technical Field
The invention relates to the technical field of motors and compressors, in particular to a motor rotor, a motor and a direct-current variable-frequency compressor.
Background
The compressor is a core device of an electric appliance such as an air conditioner, a refrigerator and the like, and most of the compressors are driven by motors, so that the compressor has larger energy consumption. Along with the progress of society and the continuous and severe energy situation, related industries are increasingly aiming at pushing out some products for saving energy and reducing consumption. In recent years, the direct current frequency conversion technology has become one of the main driving technologies in the refrigeration industry, and meanwhile, a permanent magnet synchronous motor is also the first choice of a motor for a compressor.
The permanent magnet synchronous motor for the DC variable frequency compressor consists of a stator and a rotor, wherein the stator is fixed in the compressor, the rotor in the compressor is provided with a permanent magnet, and the eccentric rotating shaft is used for driving parts such as a piston and the like to perform the compression process of the refrigerant.
As shown in fig. 1, a conventional in-line permanent magnet synchronous motor rotor for a dc variable frequency compressor generally includes a rotor core 101, permanent magnets 102 embedded in the rotor core 101, and rivets 103 for fixing the rotor core 101 and other components, a shaft hole 105 for passing through an eccentric shaft is provided in the center of the rotor core 101, and a plurality of refrigerant through holes 104 arranged circumferentially along the rotor core 101 are further provided in the rotor core 101. The permanent magnets 102 are placed generally perpendicularly to the radial direction of the rotor core 101, and this placement makes it difficult to reduce the amount of the permanent magnets 102 and to achieve a small size and high efficiency of the motor.
Disclosure of Invention
The invention aims to provide a motor rotor, a motor and a direct-current variable-frequency compressor, which can improve the torque density of the motor, meet the requirements of high efficiency and miniaturization of the motor and further improve the performance of the direct-current variable-frequency compressor.
In order to solve the problems, the invention provides a motor rotor, a rotating shaft hole for penetrating through a rotating shaft is formed in the center of a rotor core of the motor rotor, a magnet groove, a rivet hole, a secondary refrigerant through hole and a primary refrigerant through hole are further formed in the periphery of the rotating shaft hole in the rotor core, the magnet groove is of a V-shaped structure and is used for fixedly mounting permanent magnets in an embedded mode, the polarities of the permanent magnets placed in the adjacent V-shaped magnet grooves are opposite, the secondary refrigerant through hole is arranged between the V-shaped magnet groove and the rotating shaft hole, and the primary refrigerant through hole is arranged between the adjacent V-shaped magnet grooves.
Further, a V-shaped permanent magnet is placed in each V-shaped magnet groove, or a section of linear permanent magnet is placed in each of two sections of linear grooves of each V-shaped magnet groove, and the two sections of linear permanent magnets are placed in a mode that the polarities of magnetic poles are the same.
Further, the main refrigerant through hole and the auxiliary refrigerant through hole are round, elliptical, arc-shaped with line segments or rectangular.
Further, a connecting line from the center of the rotating shaft hole to the outermost end of the main refrigerant through hole in the radial direction is defined as L1, the length is defined as d, a connecting line from the center of the rotating shaft hole to the vertex angle of the V-shaped magnet groove close to the rotating shaft hole is defined as L2, an included angle between a line segment L1 and the line segment L2 is defined as alpha, and a distance from the center of the rotating shaft hole to the connecting line between the two vertex angles of the V-shaped magnet groove close to the rotating shaft hole is defined as b, and the following conditions are satisfied:
where p is the pole pair number of the motor.
Further, at least one main refrigerant through hole is communicated with an oil return through hole along the outer side of the radial direction of the rotor core.
Further, the oil return through hole is semicircular, semi-elliptical, arc-shaped with line segments or rectangular.
Further, the length d 1 of the oil return through hole in the circumferential direction of the rotor core meets d 1≤d3/2, the length d 2 of the oil return through hole in the radial direction of the rotor core meets d 2≥d3/16, and d 3 is the length of the refrigerant through hole communicated with the oil return through hole in the circumferential direction of the rotor core.
Further, the rotor core includes rotor sheets of the same shape and is stacked by the rotor sheets.
The invention also provides a motor, which comprises a stator and the motor rotor, wherein the motor rotor is installed in the stator through a rotating shaft to rotate.
The invention also provides a direct-current variable-frequency compressor, which comprises the motor.
Compared with the prior art, the motor rotor, the motor and the direct-current variable-frequency compressor have the advantages that the V-shaped magnet grooves are formed in the rotor core, so that the use amount of the embedded permanent magnets is obviously increased, the torque density of the motor is increased, the requirements of high efficiency and miniaturization of the motor can be met, and the performance of the direct-current variable-frequency compressor is improved. Meanwhile, as the main coolant through holes and the auxiliary coolant through holes on the rotor core are matched with the arrangement mode of the V-shaped magnet grooves and the rotating shaft holes, the requirement of mechanical strength of the rotor is met, the problem that the magnetic resistance of the rotor side is obviously increased due to the fact that magnetic force lines of a main pole magnetic field of the rotor pass through the coolant through holes to form a closed loop can be avoided, the coolant through area of the rotor can be increased as much as possible on the premise of ensuring the performance and reliability of the motor, circulation of coolant in the compressor is promoted, and the purpose of cooling the rotor is achieved.
Drawings
FIG. 1 is a schematic diagram of a rotor of an embedded permanent magnet synchronous motor for a DC variable frequency compressor in the prior art;
Fig. 2 is a schematic structural view of a motor rotor of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings for the purpose of making the objects and features of the present invention more comprehensible, however, the present invention can be embodied in various forms and should not be construed as limited to the embodiments set forth herein.
Referring to fig. 2, the present invention provides a motor rotor, a rotor core 2 of the motor rotor is provided with a shaft hole for passing through a shaft 1, a magnet slot 3 for embedding and fixedly mounting a permanent magnet 4, a rivet hole for placing a rivet 5, a secondary refrigerant through hole 6 and a primary refrigerant through hole 7 are further provided on the periphery of the shaft hole on the rotor core 2, the permanent magnet 4 can be made of neodymium iron boron or ferrite materials, the rotor core 2 comprises rotor punching sheets with the same shape, and the rotor punching sheets are formed by stacking riveting or welding and are connected with other parts of the motor rotor through rivets 5. The motor rotor of the present invention is rotated by the rotating shaft 1 placed in the corresponding stator to form a motor assembly.
The magnet grooves 3 are V-shaped magnet grooves, namely, the magnet grooves 3 are of V-shaped structures, the magnetic poles of the permanent magnets 4 placed in the adjacent V-shaped magnet grooves 3 are opposite in polarity, each V-shaped magnet groove 3 can be provided with one V-shaped permanent magnet 4, two sections of linear permanent magnets 4 can be placed in two sections of linear grooves of each V-shaped magnet groove 3 respectively, and the two sections of linear permanent magnets 4 are placed in the same manner according to the magnetic poles. In this embodiment, the edge of each V-shaped magnet slot 3 near the center of the rotation shaft hole is discontinuous, while the edge of each V-shaped magnet slot 3 far from the center of the rotation shaft hole is continuous, and a section of linear permanent magnet 4 is placed in each of the two sections of linear slots of each V-shaped magnet slot 3, and the polarities of the poles of the two sections of linear permanent magnets 4 are the same, and the poles of the permanent magnets 4 placed in adjacent V-shaped magnet slots 3 are opposite to each other, by leaning against the protruding portions of the edges of the V-shaped magnet slots 3 near the center of the rotation shaft hole, respectively, so as to avoid collision. The auxiliary refrigerant through holes 6 are arranged between the corresponding V-shaped magnet grooves 3 and the rotating shaft holes, and the main refrigerant through holes 7 are arranged between the adjacent V-shaped magnet grooves 3. Preferably, a secondary refrigerant through hole 6 is arranged between all the V-shaped magnet grooves 3 and the rotating shaft hole, a primary refrigerant through hole 7 is arranged between every two adjacent V-shaped magnet grooves 3, and all the primary refrigerant through holes 7 and the secondary refrigerant through holes 6 are circular holes, so that all the primary refrigerant through holes 7 and the secondary refrigerant through holes 6 are alternately arranged along the circumferential direction of the rotor core 2, and the refrigerant flow area is increased. In other embodiments of the present invention, the main coolant through hole 7 and the auxiliary coolant through hole 6 may have other shapes, for example, arc shapes, and one auxiliary coolant through hole 6 may not be provided between all the V-shaped magnet slots 3 and the spindle hole, or one main coolant through hole 7 may not be provided between every two adjacent V-shaped magnet slots 3.
Defining a connecting line from the center of a rotating shaft hole to the outermost end of the main refrigerant through hole 7 in the radial direction as L1, the length as d, defining a connecting line from the center of the rotating shaft hole to the vertex angle of the V-shaped magnet groove 3 close to the rotating shaft hole (namely, a connecting line from the center of the rotating shaft hole to the end point of the V-shaped magnet groove 3 where the permanent magnet 4 is placed close to the rotating shaft hole) as L2, wherein an included angle between the line segment L1 and the line segment L2 is alpha, and defining a connecting line from the center of the rotating shaft hole to the two vertex angles of the V-shaped magnet groove close to the rotating shaft hole (namely, a connecting line center from the center of the rotating shaft hole to the two end points of the V-shaped magnet groove 3 where the permanent magnet 4 is placed close to the rotating shaft hole) as b, wherein:
where p is the pole pair number of the motor.
According to the motor rotor, the V-shaped magnet grooves are formed in the rotor iron core, so that the use amount of the embedded permanent magnets is obviously increased, the torque density of the motor is increased, and the requirements of high efficiency and miniaturization of the motor are met. Meanwhile, the arrangement mode of the main refrigerant through holes and the auxiliary refrigerant through holes meets the requirement of mechanical strength of the rotor, and the situation that the magnetic force lines of the main pole magnetic field of the rotor form a closed loop through the refrigerant through holes to cause the magnetic resistance of the rotor side to be obviously increased can be avoided, so that the refrigerant through area of the rotor can be increased as much as possible on the premise of ensuring the performance and the reliability of the motor, the circulation of the refrigerant in the compressor is promoted, and the purpose of cooling the rotor is achieved.
In addition, an oil return through hole 8 communicated with the main refrigerant through holes 7 is respectively arranged on the outer side of at least one main refrigerant through hole 7 on the rotor core 2 along the radial direction of the rotor core 2, the oil return through hole 8 is semicircular, semi-elliptic, arc-shaped with line segments or rectangular, the length d 1 of the oil return through hole 8 in the circumferential direction of the rotor core 2 meets d 1≤d3/2, the length d 2 of the oil return through hole 8 in the radial direction of the rotor core 2 meets d 2≥d3/16, and d 3 is the length of the refrigerant through hole 7 communicated with the oil return through hole 8 in the circumferential direction of the rotor core 2.
Due to the fact that the oil return through hole 8 communicated with the refrigerant through hole 7 is formed in the rotor core 2, when the rotor rotates, part of atomized refrigerating machine oil dissolved in refrigerant gas can be thrown to the oil return through hole 8 under the action of radial force and falls back along the oil return through hole 8, refrigerating machine oil brought into the upper portion of the motor is reduced, accordingly oil yield of the compressor is reduced, and lubricating performance of the pump body is guaranteed.
The invention also provides a motor comprising a stator and the motor rotor, wherein the motor rotor is installed in the stator to rotate through a rotating shaft 1. The motor adopts the motor rotor, so that the motor torque density is obviously improved, and the requirements of high efficiency and miniaturization can be met.
The invention also provides a direct-current variable-frequency compressor, which comprises the motor. The performance of the direct-current variable-frequency compressor is greatly improved due to the adoption of the motor.
In one application implementation, the motor pole pair number p=3, and the motor rotor adopting the V-shaped magnet slot structure has 14.7% higher permanent magnet consumption than the existing motor rotor with permanent magnet orthogonal rotor diameter, so that the running current can be reduced, and the motor efficiency can be improved. Meanwhile, the refrigerant through holes are arranged in a mode of fig. 2, the length d of L1=23.8 mm, the included angle α of L1 and L2=0.46 rad, the distance b=24.8 mm, and the following conditions are satisfied:
The mechanical strength of the rotor can meet the requirements, and meanwhile, the obvious increase of the magnetic resistance of the rotor side is avoided, so that the flow area of the refrigerant of the rotor is increased on the premise of ensuring the performance and the reliability of the motor, and when the rotor is applied to a direct-current variable-frequency compressor, the circulation of the refrigerant in the compressor can be obviously promoted, and the purpose of cooling the rotor is achieved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A motor rotor is characterized in that a rotating shaft hole for penetrating through a rotating shaft is formed in the center of a rotor iron core of the motor rotor, a magnet groove, a rivet hole, an auxiliary refrigerant through hole and a main refrigerant through hole are further formed in the periphery of the rotating shaft hole in the rotor iron core, the magnet groove is of a V-shaped structure and is used for fixedly mounting permanent magnets in an embedded mode, magnetic poles of the permanent magnets placed in adjacent V-shaped magnet grooves are opposite, the auxiliary refrigerant through hole is arranged between the V-shaped magnet grooves and the rotating shaft hole, the main refrigerant through hole is arranged between the adjacent V-shaped magnet grooves, a V-shaped permanent magnet is placed in each V-shaped magnet groove, or a section of linear permanent magnet is placed in each of two sections of linear grooves of each V-shaped magnet groove, and the two sections of linear permanent magnets are placed in a mode that the magnetic poles are identical;
The connecting line from the center of the rotating shaft hole to the outermost end of the main refrigerant through hole in the radial direction is defined as L1, the length is d, the connecting line from the center of the rotating shaft hole to the vertex angle of the V-shaped magnet groove close to the rotating shaft hole is defined as L2, the included angle between the line segment L1 and the line segment L2 is alpha, the connecting line from the center of the rotating shaft hole to the two vertex angles of the V-shaped magnet groove close to the rotating shaft hole is defined as b, and the following conditions are satisfied:
where p is the pole pair number of the motor.
2. The motor rotor as set forth in claim 1, wherein the primary refrigerant through hole and the secondary refrigerant through hole are circular, elliptical, arc-shaped with line segments, or rectangular in shape.
3. The motor rotor according to claim 1, wherein at least one main refrigerant through hole communicates with an oil return through hole along an outer side of the rotor core in a radial direction.
4. A motor rotor according to claim 3, wherein the oil return through hole is in the shape of a semicircle, a semi-ellipse, an arc with line segments, or a rectangle.
5. A motor rotor as set forth in claim 3, wherein a length d 1 of said oil return through hole in a circumferential direction of said rotor core satisfies d 1≤d3/2, and a length d 2 of said oil return through hole in a radial direction of said rotor core satisfies d 2≥d3/16, wherein d 3 is a length of a refrigerant through hole communicating with said oil return through hole in a circumferential direction of said rotor core.
6. The motor rotor of claim 1 wherein said rotor core comprises identically shaped rotor laminations and is laminated from said rotor laminations.
7. An electric motor comprising a stator and the motor rotor of any one of claims 1 to 6, the motor rotor being mounted for rotation in the stator by a shaft.
8. A direct current variable frequency compressor comprising the motor of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710475668.5A CN109104011B (en) | 2017-06-21 | 2017-06-21 | Motor rotor, motor and DC variable frequency compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710475668.5A CN109104011B (en) | 2017-06-21 | 2017-06-21 | Motor rotor, motor and DC variable frequency compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109104011A CN109104011A (en) | 2018-12-28 |
| CN109104011B true CN109104011B (en) | 2025-02-14 |
Family
ID=64796300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710475668.5A Active CN109104011B (en) | 2017-06-21 | 2017-06-21 | Motor rotor, motor and DC variable frequency compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109104011B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416455A (en) * | 2020-05-21 | 2020-07-14 | 上海纳铁福传动系统有限公司 | Rotor punching sheet of high-speed permanent magnet synchronous motor for vehicle and motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010045974A (en) * | 2009-11-25 | 2010-02-25 | Yaskawa Electric Corp | Permanent magnet type synchronous rotating electric machine, and vehicle, elevator, fluid machinery and processing machine equipped with same |
| JP2011241750A (en) * | 2010-05-18 | 2011-12-01 | Mitsubishi Electric Corp | Hermetic compressor |
| CN206948060U (en) * | 2017-06-21 | 2018-01-30 | 上海海立电器有限公司 | Motor rotor, motor and DC frequency-changeable compressor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4815204B2 (en) * | 2005-12-01 | 2011-11-16 | アイチエレック株式会社 | Permanent magnet rotating machine and compressor |
| JP5221030B2 (en) * | 2006-06-20 | 2013-06-26 | 三菱電機株式会社 | Rotor, rotor manufacturing method, hermetic compressor, and refrigeration cycle apparatus |
| JP2008228395A (en) * | 2007-03-09 | 2008-09-25 | Daikin Ind Ltd | Motor rotor and compressor provided with the same |
| CN106451849B (en) * | 2016-10-13 | 2018-12-28 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of rotor structure, motor and compressor |
-
2017
- 2017-06-21 CN CN201710475668.5A patent/CN109104011B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010045974A (en) * | 2009-11-25 | 2010-02-25 | Yaskawa Electric Corp | Permanent magnet type synchronous rotating electric machine, and vehicle, elevator, fluid machinery and processing machine equipped with same |
| JP2011241750A (en) * | 2010-05-18 | 2011-12-01 | Mitsubishi Electric Corp | Hermetic compressor |
| CN206948060U (en) * | 2017-06-21 | 2018-01-30 | 上海海立电器有限公司 | Motor rotor, motor and DC frequency-changeable compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109104011A (en) | 2018-12-28 |
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