CN206041676U - A compressor that is used for reciprocating compressor's frequency conversion rotor and has it - Google Patents

A compressor that is used for reciprocating compressor's frequency conversion rotor and has it Download PDF

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Publication number
CN206041676U
CN206041676U CN201621038114.6U CN201621038114U CN206041676U CN 206041676 U CN206041676 U CN 206041676U CN 201621038114 U CN201621038114 U CN 201621038114U CN 206041676 U CN206041676 U CN 206041676U
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CN
China
Prior art keywords
straight line
line portion
frequency conversion
rotor
centre bore
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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.)
Active
Application number
CN201621038114.6U
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Chinese (zh)
Inventor
陈海全
孙祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
Anhui Meizhi Compressor Co Ltd
Original Assignee
Midea Group Co Ltd
Anhui Meizhi Compressor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, Anhui Meizhi Compressor Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201621038114.6U priority Critical patent/CN206041676U/en
Priority to PCT/CN2016/108740 priority patent/WO2018040352A1/en
Application granted granted Critical
Publication of CN206041676U publication Critical patent/CN206041676U/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets

Abstract

The utility model discloses a compressor that is used for reciprocating compressor's frequency conversion rotor and has it, a frequency conversion rotor includes for reciprocating compressor: rotor core, rotor core is last is equipped with along its axial through's centre bore with establish in the multiple magnets groove of centre bore periphery, every magnet cell forms respectively to the arc wall that radially incurves along rotor core roughly, a side wheel profile of the neighbouring centre bore of arc wall forms to interior round of profile, the side wheel profile that the centre bore was kept away from to the arc wall forms to foreign steamer profile, the rotor core 1 at interior round of profile middle part is greater than the rotor core 1 at both ends, magnet, magnet are suitable for to be installed in magnet cell. According to the utility model discloses a volume that is used for reciprocating compressor's frequency conversion rotor, can the specified performance and the prerequisite of reliability under, can reduce the volume of frequency conversion rotor, and then reduce to have its motor and compressor.

Description

For the frequency conversion rotor and the compressor with which of reciprocating compressor
Technical field
The utility model is related to Compressor Technology field, more particularly to a kind of frequency conversion rotor for reciprocating compressor and Compressor with which.
Background technology
The variable-frequency reciprocating refrigeration compressor of correlation technique, variable-frequency motor mainly include motor stator, rotor, wherein rotor Including rotor core and permanent magnet, the installing locating slot of permanent magnet in rotor core, is provided with, is to ensure that rotor has higher magnetic flux Amount, permanent magnet trough generally described above is designed to arc shaped groove or other Complex Grooves, so as to increased the volume of permanent magnet, such as schemes 1 show existing rotor core structure, and magnet slot a1 is regular arc.
During compressor operation, enough lubricating oil, existing main shaft pump oil mode is needed to be centrifugation pump oil, the energy of pump oil is centrifuged Power rotating speed often with main shaft, external diameter have and directly contact.Variable-frequency reciprocating compressor has wider operating frequency, at compressor When relatively low rotation speed operation, it is to ensure enough pump oil amounts, then needs larger main shaft external diameter.
As shown in figure 1, when rotor diameter D1 has a certain degree of reduction, being provided with the rotor core of regular arc shaped groove a1 D11 is then reduced accordingly so that rotor bore aperture d1 must be reduced accordingly, and the reduction of aperture d1 can directly result in compression Machine pumping ability at the low rotational speed declines, and so as to reduce the lubrication of compressor each kinematic pair at the low rotational speed, has a strong impact on pressure The reliability of contracting machine.
Utility model content
The utility model is intended at least to solve to a certain extent one of technical problem in correlation technique.For this purpose, this reality A kind of frequency conversion rotor for reciprocating compressor is proposed with new, the frequency conversion rotor can guarantee that frequency conversion rotor bore hole Footpath size reduces rotor diameter in the case of not reducing such that it is able to reduce with which on the premise of performance and reliability is ensured Motor and compressor volume.
The utility model also proposed a kind of compressor with the frequency conversion rotor for reciprocating compressor.
According to the frequency conversion rotor for reciprocating compressor of the present utility model, including:Rotor core, the rotor core Be provided with along its axially through centre bore and be located at multiple magnet slots of the centre bore periphery, each described magnet slot difference The deep-slotted chip breaker being bent radially inward along the rotor core is formed generally as, the deep-slotted chip breaker is adjacent to the side of the centre bore Outline line is formed as inner outline, and the deep-slotted chip breaker is formed as outer contour away from the side outline line of the centre bore, described Radius of curvature of the radius of curvature in the middle part of inner outline more than two ends;Magnet, the magnet are adapted to mount in the magnet slot.
According to the frequency conversion rotor for reciprocating compressor of the present utility model, the curvature in the middle part of the inner outline of magnet slot Radius of curvature of the radius more than two ends.In the case where the aperture size for ensureing centre bore does not reduce, rotor core can be reduced Outside dimension.Thus, it is possible to ensure compressor pumping ability at the low rotational speed, the premise of Performance And Reliability is being ensure that Under, such that it is able to reduce the volume of frequency conversion rotor, and then reduce the volume of the motor with which and compressor.
In addition, according to the frequency conversion rotor for reciprocating compressor of the present utility model, can also have what is added as follows Technical characteristic:
According to some embodiments of the present utility model, in the middle part of the inner outline, be formed as first straight line portion, described One line part is along radially extending perpendicular to the rotor core.
Alternatively, the outer contour of magnet slot described at least one is provided with second straight line portion, the same magnet slot The second straight line portion and the first straight line portion along the centre bore be radially spaced setting and the first straight line portion with The line at the midpoint in the second straight line portion is through the center of the centre bore.
Alternatively, the outer contour of each magnet slot is provided with the second straight line portion, the same magnet slot The second straight line portion and the first straight line portion along the centre bore be radially spaced setting and the first straight line portion with The line at the midpoint in the second straight line portion is through the center of the centre bore.
Alternatively, the length phase in the length in the first straight line portion of the same magnet slot and the second straight line portion Deng.
Alternatively, the part positioned at first straight line portion two ends of the inner outline is respectively formed as arcuate line segment.
Further, the arcuate line segment at first straight line portion two ends is relative in the first straight line portion The straight line of the central point of point and the rotor core is symmetrical.
According to some embodiments of the present utility model, the magnet slot includes at least four, and multiple magnet slots are along institute State being circumferentially spaced one from the other for centre bore to be evenly arranged.
Additionally, the utility model also proposed a kind of reciprocating compressor, the reciprocating compressor has above-mentioned practicality The frequency conversion rotor for reciprocating compressor of new embodiment.
According to the reciprocating compressor of the utility model embodiment, due to above-described embodiment for reciprocating compression The frequency conversion rotor of machine, therefore the compressor of the utility model embodiment also has above-mentioned technique effect.I.e. according to the utility model The compressor of embodiment, by arranging the frequency conversion rotor for reciprocating compressor of above-described embodiment, is ensureing rotor center The aperture size in hole can reduce frequency conversion rotor diameter in the case of not reducing such that it is able to ensure the performance and reliability of compressor Property on the premise of reduce with its motor and compressor volume.
Additional aspect of the present utility model and advantage will be set forth in part in the description, partly will be from explained below In become obvious, or by it is of the present utility model practice recognize.
Description of the drawings
Fig. 1 is the structural representation of the rotor core of the frequency conversion rotor for reciprocating compressor of prior art;
Fig. 2 is the structure of the rotor core of the frequency conversion rotor for reciprocating compressor according to the utility model embodiment Schematic diagram.
Reference:
100:Rotor core;
1:Magnet slot, 11:Inner outline, 111:First straight line portion, 112:Arcuate line segment, 12:Outer contour, 121:Second Line part;
2:Centre bore.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings.Below by The embodiment being described with reference to the drawings is exemplary, it is intended to for explaining the utility model, and it is not intended that new to this practicality The restriction of type.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " orientation of the instruction such as " axial direction ", " radial direction ", " circumference " or position relationship based on orientation shown in the drawings or position relationship, are only It is to describe for the ease of describing the utility model and simplifying, rather than indicates or imply that the device or element of indication there must be spy Fixed orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two It is individual, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " Gu It is fixed " etc. term should be interpreted broadly, it is for example, it may be fixedly connected, or be detachably connected or integral;Can be It is mechanically connected, or electrically connects or can communicate each other;Can be joined directly together, it is also possible to by the indirect phase of intermediary Even, can be connection or the interaction relationship of two elements of two element internals, unless otherwise clearly restriction.For this For the those of ordinary skill in field, concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
Below with reference to the accompanying drawings the frequency conversion rotor for reciprocating compressor according to the utility model embodiment is described.This reality Small-sized variable-frequency compressor be can be applicable to the new frequency conversion rotor for reciprocating compressor.
100 He of rotor core can be included according to the frequency conversion rotor for reciprocating compressor of the utility model embodiment Magnet (figure is to illustrate).
Specifically, rotor core 100 be provided with along its axially through centre bore 2 and be located at the multiple of 2 periphery of centre bore Magnet slot 1, each magnet slot 1 are formed generally as the deep-slotted chip breaker being bent radially inward along rotor core 100 respectively, and deep-slotted chip breaker is adjacent The side outline line of nearly centre bore 2 is formed as inner outline 11, and deep-slotted chip breaker is formed as foreign steamer away from the side outline line of centre bore 2 Profile 12, radius of curvature of the radius of curvature in the middle part of inner outline 11 more than two ends, magnet are adapted to mount in magnet slot 1.
In other words, rotor core 100 is coaxially disposed with centre bore 2, and centre bore 2 turns along axially penetrating through for rotor core 100 Sub- iron core 100, multiple magnet slots 1 along the circumferentially disposed of rotor core 100 and positioned at the periphery of centre bore 2, each 1 shape of magnet slot Become substantial arc groove, deep-slotted chip breaker is bent radially inward along rotor core 100.The shape of magnet can be with the inwall of magnet slot 1 Face is adapted, so as to facilitate the assembling of magnet and magnet slot 1.
As shown in Fig. 2 the outline line of deep-slotted chip breaker includes inner outline 11 and outer contour 12, inner outline 11 is adjacent to center Hole 2 is simultaneously protruded towards the direction of centre bore 2, and outer contour 12 is protruded away from centre bore 2 and towards 2 direction of centre bore, and in The radial direction in heart hole 2 is located at the outside of inner outline 11.
As shown in figure 1, magnet slot a1 of the frequency conversion rotor for reciprocating compressor in conventional art is formed as rule Deep-slotted chip breaker, curvature is identical everywhere for the inner outline of deep-slotted chip breaker, the radial ruler in the middle part of the center to inner outline of centre bore Very little (d11 i.e. as shown in Figure 1) is less, in the middle part of the outline line and inner outline of centre bore between radial dimension it is less, When reducing the outside dimension of rotor core, the aperture size of centre bore accordingly must reduce, so as to affect the property of frequency conversion rotor Can, and then the lubrication of compressor each kinematic pair at the low rotational speed is reduced, have a strong impact on the reliability of compressor.
As shown in Fig. 2 the radius of curvature in the utility model in the middle part of inner outline 11 is more than the radius of curvature at two ends.Also It is to say, inner outline 11 curves inwardly degree reduction, i.e. radial dimension of the middle part of inner outline 11 to the central point of centre bore 2 (d21 i.e. as shown in Figure 2) increases, and the outline line of centre bore 2 is increased with the radial dimension at the middle part of the inner outline 11 of magnet slot 1 Plus.So, when outside dimension (D2 i.e. as shown in Figure 2) of rotor core 100 is reduced, the hole of centre bore 2 can not be reduced Footpath size (d2 i.e. as shown in Figure 2).Compressor pumping ability at the low rotational speed is thereby may be ensured that, thus, can protected On the premise of card Performance And Reliability, the volume of frequency conversion rotor can be reduced, and then reduction has its motor and compressor Volume.
According to the frequency conversion rotor for reciprocating compressor of the utility model embodiment, the inner outline 11 of magnet slot 1 Radius of curvature of the radius of curvature at middle part more than two ends.In the case where aperture size d2 for ensureing centre bore 2 does not reduce, can drop The outside dimension D2 of low rotor iron core 100.Thereby may be ensured that compressor pumping ability at the low rotational speed.Thus, can On the premise of ensureing Performance And Reliability, the volume of frequency conversion rotor can be reduced, and then reduce the motor with which and compressor Volume.
According to some embodiments of the present utility model, the middle part of inner outline 11 is formed as first straight line portion 111, and first Line part 111 is along radially extending perpendicular to rotor core 100.Specifically, the middle part of inner outline 11 can be formed as straight line (i.e. first straight line portion 111), the middle part of inner outline 11 and the radial dimension of centre bore 2, the i.e. outline line of centre bore 2 are closest The distance a little with the center of inner outline 11 at 11 center of inner outline, in 111 vertical inner outline 11 of first straight line portion The line at the center of the heart and centre bore extends and perpendicular to the radial direction of rotor core 100, and the radial direction of rotor core 100 here is Refer to the radial direction that the line at the midpoint of the closest inner outline of outline line 11 in the center to center hole 2 of centre bore 2 is located, first is straight Line portion 111 is perpendicular with the extended line of the radial direction.Thus, it is possible to further increase middle part and the centre bore 2 of inner outline 11 Outline line radial dimension.It should be noted that for the size (L2 i.e. as shown in Figure 2) in first straight line portion 111, The utility model is simultaneously not particularly limited.
Alternatively, the outer contour 12 of at least one magnet slot 1 can be provided with second straight line portion 121, same magnet slot 1 Second straight line portion 121 and first straight line portion 111 along centre bore 2 be radially spaced setting and first straight line portion 111 and second is straight The line at the midpoint in line portion 121 is through the center of centre bore 2.Magnet is adapted with magnet slot 1, that is to say, that the shape of magnet Can be adapted with the shape of magnet slot 1, first straight line portion 111 is parallel with second straight line portion 121, can be formed on magnet The shape that one line part 111 and second straight line portion 121 are adapted, so that the thickness of magnet can keep unanimous on the whole.Thus, may be used So that the structure of magnet slot 1 and magnet is more regular rationally.So as to be beneficial to the formation of magnet slot 1 and the manufacturing of magnet.
Further, as shown in Fig. 2 the outer contour 12 of each magnet slot 1 can be respectively equipped with second straight line portion 121, together The second straight line portion 121 of one magnet slot 1 is arranged and first straight line along being radially spaced for centre bore 2 with first straight line portion 111 The line at the midpoint in portion 111 and second straight line portion 121 is through the center of centre bore 2.Specifically, it is equipped with each magnet slot 1 Second straight line portion 121, the second straight line portion 121 of the outer contour 12 of each magnet slot 1 and the first straight line portion of inner outline 11 111 parallel and diametrically settings along centre bore 2 and first straight line portion 111 is parallel with second straight line portion 121.
Further, the equal length in the length in the first straight line portion 111 of same magnet slot 1 and second straight line portion 121. Thus, the distance between first straight line portion 111 and second straight line portion 121 everywhere is identical, and magnet is adapted with magnet slot 1, can make The thickness for obtaining part relative with first straight line portion 111 and second straight line portion 121 on magnet keeps being substantially the same.So as to facilitate magnetic The manufacturing of body and frequency conversion rotor, can also ensure the Performance And Reliability of frequency conversion rotor.
Alternatively, the part positioned at 111 two ends of first straight line portion of inner outline 11 is respectively formed as arcuate line segment 112. As shown in Fig. 2 inner outline 11 includes first straight line portion 111 and arcuate line segment 112, first straight line portion 111 is located at inner outline 11 middle part, arcuate line segment 112 are located at the two ends in first straight line portion 111.Such that it is able to reduce the change of 1 shape of magnet slot, letter The manufacturing process of change frequency conversion rotor, and the volume of magnet slot 1 can be ensured, be conducive to the matching of magnet slot 1 and magnet, Jin Erbao The Performance And Reliability of card frequency conversion rotor.
Further, the arcuate line segment 112 at 111 two ends of first straight line portion can be relative in first straight line portion 111 The straight line of the central point of point and rotor core 100 is symmetrical.That is, first straight line portion 111 is located at the centre of inner outline 11 Position, the midpoint in first straight line portion 111 is the midpoint of inner outline 11, and inner outline 11 can be relative with first straight line portion 111 The straight line of the central point of midpoint and rotor core 100 is symmetrical, so as to be conducive to the formation of magnet slot 1 and the production of frequency conversion rotor Manufacture.
In some embodiments of the present utility model, magnet slot 1 can include at least four, and multiple magnet slots 1 are along center Being circumferentially spaced one from the other for hole 2 is evenly arranged.So as to the Performance And Reliability of frequency conversion rotor can be ensured.Show in as shown in Figure 2 In example, magnet slot 1 can include four, and four magnet slots 1 are spaced along the circumference of centre bore 2 and are evenly arranged.
Additionally, the utility model also proposed a kind of reciprocating compressor, the reciprocating compressor has above-mentioned practicality The frequency conversion rotor for reciprocating compressor of new embodiment.
According to the reciprocating compressor of the utility model embodiment, due to above-described embodiment for reciprocating compression The frequency conversion rotor of machine, therefore the compressor of the utility model embodiment also has above-mentioned technique effect.I.e. according to the utility model The compressor of embodiment, by arranging the frequency conversion rotor for reciprocating compressor of above-described embodiment, is ensureing rotor center Aperture size d2 in hole 2 can reduce frequency conversion rotor diameter D2 in the case of not reducing such that it is able in the performance for ensureing compressor And on the premise of reliability, reduce the volume of compressor.
Other according to the compressor of the utility model embodiment are constituted and are operated for those of ordinary skill in the art For be all known, be not detailed herein.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score Can be the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, first is special Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show Example ", or the description of " some examples " etc. mean specific features with reference to the embodiment or example description, structure, material or spy Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term State.And, the specific features of description, structure, material or feature can be with Combined in any one or more embodiments or example in an appropriate manner.Additionally, in the case of not conflicting, this area Technical staff the feature of the different embodiments or example described in this specification and different embodiment or example can be entered Row is combined and is combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is Exemplary, it is impossible to it is interpreted as to restriction of the present utility model, one of ordinary skill in the art is in scope of the present utility model It is interior above-described embodiment to be changed, be changed, being replaced and modification.

Claims (9)

1. a kind of frequency conversion rotor for reciprocating compressor, it is characterised in that include:
Rotor core, the rotor core be provided with along its axially through centre bore and be located at the multiple of the centre bore periphery Magnet slot, each described magnet slot are formed generally as the deep-slotted chip breaker being bent radially inward along the rotor core respectively, described Deep-slotted chip breaker is formed as inner outline, side of the deep-slotted chip breaker away from the centre bore adjacent to the side outline line of the centre bore Outline line is formed as outer contour, radius of curvature of the radius of curvature in the middle part of the inner outline more than two ends;
Magnet, the magnet are adapted to mount in the magnet slot.
2. the frequency conversion rotor for reciprocating compressor according to claim 1, it is characterised in that the inner outline Middle part is formed as first straight line portion, and the first straight line portion is along radially extending perpendicular to the rotor core.
3. the frequency conversion rotor for reciprocating compressor according to claim 2, it is characterised in that magnetic described at least one The outer contour of body groove is provided with second straight line portion, the second straight line portion and the first straight line portion of the same magnet slot The line for being radially spaced setting and the first straight line portion and the midpoint in the second straight line portion along the centre bore is passed through The center of the centre bore.
4. the frequency conversion rotor for reciprocating compressor according to claim 3, it is characterised in that each described magnet slot Outer contour be provided with the second straight line portion, the second straight line portion and the first straight line portion of the same magnet slot The line for being radially spaced setting and the first straight line portion and the midpoint in the second straight line portion along the centre bore is passed through The center of the centre bore.
5. the frequency conversion rotor for reciprocating compressor according to claim 3, it is characterised in that the same magnet The length in the first straight line portion of groove and the equal length in the second straight line portion.
6. the frequency conversion rotor for reciprocating compressor according to claim 2, it is characterised in that the inner outline Part positioned at first straight line portion two ends is respectively formed as arcuate line segment.
7. the frequency conversion rotor for reciprocating compressor according to claim 6, it is characterised in that the first straight line portion The arcuate line segment at two ends is relative to the midpoint through the first straight line portion and the straight line of the central point of the rotor core Symmetrically.
8. the frequency conversion rotor for reciprocating compressor according to any one of claim 1-7, it is characterised in that described Magnet slot includes at least four, and multiple magnet slots are evenly arranged along being circumferentially spaced one from the other for the centre bore.
9. a kind of reciprocating compressor, it is characterised in that including any one of claim 1-8 for reciprocating compression The frequency conversion rotor of machine.
CN201621038114.6U 2016-09-05 2016-09-05 A compressor that is used for reciprocating compressor's frequency conversion rotor and has it Active CN206041676U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201621038114.6U CN206041676U (en) 2016-09-05 2016-09-05 A compressor that is used for reciprocating compressor's frequency conversion rotor and has it
PCT/CN2016/108740 WO2018040352A1 (en) 2016-09-05 2016-12-06 Variable-frequency rotor used in reciprocating compressor, and compressor having same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621038114.6U CN206041676U (en) 2016-09-05 2016-09-05 A compressor that is used for reciprocating compressor's frequency conversion rotor and has it

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CN206041676U true CN206041676U (en) 2017-03-22

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CN109245354A (en) * 2018-11-13 2019-01-18 卧龙电气集团股份有限公司 Rotor core, rotor and motor

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JP4248778B2 (en) * 2001-10-25 2009-04-02 アイチエレック株式会社 Permanent magnet motor rotor
JP2010166683A (en) * 2009-01-15 2010-07-29 Fujitsu General Ltd Permanent magnet motor
CN201667564U (en) * 2010-04-06 2010-12-08 上海海立(集团)股份有限公司 Stator, rotor structures of a permanent magnetic electric motor
CN103078464B (en) * 2012-12-27 2015-04-22 上海特波电机有限公司 Built-in permanent magnet synchronous motor
WO2015037127A1 (en) * 2013-09-13 2015-03-19 三菱電機株式会社 Permanent magnet-embedded electric motor, compressor, and refrigerating and air-conditioning device
US9634531B2 (en) * 2013-09-25 2017-04-25 Mitsubishi Electric Corporation Electric motor with embedded permanent magnet, compressor, and refrigeration/air-conditioning device

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