CN203119645U - Permanent magnet, rotor for an electric machine comprising such a permanent magnet and corresponding electric machine - Google Patents
Permanent magnet, rotor for an electric machine comprising such a permanent magnet and corresponding electric machine Download PDFInfo
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- CN203119645U CN203119645U CN 201320055662 CN201320055662U CN203119645U CN 203119645 U CN203119645 U CN 203119645U CN 201320055662 CN201320055662 CN 201320055662 CN 201320055662 U CN201320055662 U CN 201320055662U CN 203119645 U CN203119645 U CN 203119645U
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- 229910000859 α-Fe Inorganic materials 0.000 claims description 31
- 210000000515 tooth Anatomy 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 3
- 230000010349 pulsation Effects 0.000 abstract description 16
- 229910052761 rare earth metal Inorganic materials 0.000 description 12
- 150000002910 rare earth metals Chemical class 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- UPLPHRJJTCUQAY-WIRWPRASSA-N 2,3-thioepoxy madol Chemical compound C([C@@H]1CC2)[C@@H]3S[C@@H]3C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@](C)(O)[C@@]2(C)CC1 UPLPHRJJTCUQAY-WIRWPRASSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
The utility model relates to a permanent magnet for electric motor rotor. The permanent magnet includes an arc portion and a linear portion. The arcuate portion has an arcuate first edge and an arcuate second edge. The linear portion extends from the arcuate portion in a direction away from the arcuate portion. The linear portion has a third edge and a fourth edge, wherein at least one of the third edge and the fourth edge is a straight edge. Adopt and according to the utility model discloses a motor of permanent magnet not only can improve power density and torque density, has improved the efficiency of motor from this, makes the pulsation of the output torque of motor reduce moreover. The utility model discloses still relate to the electric motor rotor and the corresponding permanent-magnet machine who adopts above-mentioned permanent magnet.
Description
Technical field
The utility model relates to a kind of permanent magnet for rotor, more specifically, relates to and a kind ofly can improve the torque density of motor and the permanent magnet of power density.Also relate to the rotor and the corresponding motor that comprise this permanent magnet.
Background technology
In the application of existing frequency conversion refrigerant compressor, adopt the rare-earth permanent magnet motor as the driver part of compressor usually.The magnetic energy product of rare-earth permanent magnet is 6 times to 10 times of ferrite permanent magnet, so rare-earth permanent magnet is widely used in high-power, the high efficiency frequency conversion refrigerant compressor.Therefore but rare-earth permanent magnet is expensive, and the processing technology complexity has increased the cost of rare-earth permanent magnet motor widely, thereby makes the cost of the compressor that adopts this motor correspondingly increase.In addition, rare earth element not only reserves is little, and the refinement of rare earth element causes than havoc, seriously polluted environment.Therefore, along with the strictness day by day to environmental protection requirement, the exploitation of rare earth element is paid huger cost with refinement with needs, so its application also will be subjected to more restriction.
Because rare-earth magnet has aforesaid limitation, and the raw material wide material sources of ferrimagnet, with low cost become the selection of a kind of economy that replaces rare-earth permanent magnet gradually.But, ferrite permanent-magnet motor of the prior art is owing to adopting C shape ferrite permanent magnet or flat ellipse ferrite permanent magnet to cause the power density of its output and torque density less, its efficient is low relatively, and the pulsation of its output torque is bigger, so it only can be applied under the environment less to power demand, that required precision is not high.
Therefore, need a kind ofly can to improve power density and torque density in the prior art, efficient increases and the little ferrite permanent magnet motor of output torque pulsation.
The utility model content
According to embodiment of the present utility model, a kind of permanent magnet for rotor is provided, it comprises arch section and linear segment.Arch section has first edge of arc and second edge of arc.Linear segment extends along the direction away from arch section from arch section.Linear segment has the 3rd edge and the 4th edge, and wherein, at least one in the 3rd edge and the 4th edge is linear edge.
At an embodiment according to the permanent magnet for rotor of the present utility model, the 3rd edge and the 4th edge are linear edge.
According to another embodiment of the permanent magnet for rotor of the present utility model, first edge of the arc of arch section and second edge of arc are the circular arc with same center of circle.
At another embodiment according to the permanent magnet for rotor of the present utility model, arch section is the annular shape of fan.
According to another embodiment of the permanent magnet for rotor of the present utility model, the 3rd edge and the 4th edge are parallel to each other.
According to also embodiment of the permanent magnet for rotor of the present utility model, the 3rd edge and the 4th edge engage with first edge of arc and second edge of arc respectively tangently.
According to another embodiment of the permanent magnet for rotor of the present utility model, the scope of the angle that forms between second edge separately of the linear segment at the two ends of permanent magnet is 58 ° to 72 °.Advantageously, the value of above-mentioned angle is 66 °.
At another embodiment according to the permanent magnet for rotor of the present utility model, the radius at first edge of the arc of the arch section of permanent magnet is 1.5 times to 2.5 times of magnet thickness.Advantageously, the radius at first edge of arc is 2.096 times of magnet thickness.
Also embodiment according to the permanent magnet for rotor of the present utility model is formed with the magnetic pole circular arc in the outermost end of linear segment.
At another embodiment according to the permanent magnet for rotor of the present utility model, magnetic pole circular arc becomes makes the length at the 4th edge greater than the length at the 3rd edge.
According to another embodiment of the permanent magnet for rotor of the present utility model, wherein, permanent magnet is ferrite permanent magnet.
According to additional embodiments of the present utility model, a kind of rotor assembly of magneto is provided, it comprises a plurality of magnet storage tanks that are evenly spaced apart along the circumferential direction of rotor assembly and is arranged on permanent magnet in a plurality of magnet storage tanks each that permanent magnet wherein is aforesaid permanent magnet for rotor.
In an embodiment according to the rotor assembly of magneto of the present utility model, between the corresponding edge at the magnetic pole circular arc of the end of permanent magnet and corresponding magnet storage tank, form the space.
Another embodiment according to the rotor assembly of magneto of the present utility model is provided with 6 magnet storage tanks and 6 permanent magnets in rotor assembly.
According to further embodiment of the present utility model, a kind of magneto is provided, it comprises stator module and rotor assembly.Stator module comprises that stator base portion and the radial direction from the stator base portion along stator module towards a plurality of stator tooths of the inner chamber extension of stator module, are wound with winding around each in a plurality of stator tooths.Rotor assembly can be rotatably set in the inner chamber of stator module, and rotor assembly wherein is the rotor assembly of aforesaid magneto.
In an embodiment according to magneto of the present utility model, stator module comprises 9 stator tooths.
In the magneto that adopts according to permanent magnet of the present utility model, because the end of ferrite permanent magnet has linear segment, it is compared with ferrite permanent magnet motor of the prior art, and power density and torque density obtain bigger raising; Secondly, make the length at the 3rd edge less than the circular arc pole end piece of the length at the 4th edge because ferrite permanent magnet has, can reduce thus magneto the output torque pulsation and improve permanent magnet and the anti-demagnetization capability of corresponding magneto; Again, because the core of permanent magnet has adopted the form of isocentric circular arc, this makes and is conducive to more permanent magnet is filled in the magnet storage tank in the rotor assembly of magneto, can also reduce the pulsation of the output torque of magneto simultaneously.
Description of drawings
By following with reference to accompanying drawing provide to the detailed description according to specific embodiment of the utility model, can be expressly understood feature and advantage of the present utility model more, in the accompanying drawings:
Fig. 1 is the schematic diagram that illustrates according to a kind of ferrite permanent-magnet motor of prior art;
Fig. 2 is the schematic diagram that illustrates according to the another kind of ferrite permanent-magnet motor of prior art;
Fig. 3 is the schematic cross-section according to the permanent magnet for magneto of the present utility model;
Fig. 4 is the schematic diagram that adopts according to the magneto of permanent magnet of the present utility model; And
Fig. 5 illustrates ferrite permanent-magnet motor of the prior art and according to the correlation curve figure of the pulsation of the output torque of ferrite permanent-magnet motor of the present utility model.
Embodiment
With reference to the accompanying drawings to being described in detail according to illustrative embodiments of the present utility model.Description to illustrative embodiments only is for serve exemplary purposes, and never is the restriction to the utility model and application or usage.
As depicted in figs. 1 and 2, two kinds of representative ferrite permanent magnet motors 100 of the prior art are shown, it comprises stator module 120 and is contained in the interior rotor assembly 140 of bore of stator that rotor assembly 140 comprises the ferrite permanent magnet 142 and 144 that is contained in the magnet storage tank respectively.Wherein, the ferrite permanent magnet 142 among Fig. 1 is flat ellipse, and the ferrite permanent magnet 144 among Fig. 2 is C shape.The power density and the torque density that adopt above-mentioned two kinds of permanent magnet motors 100 of flat ellipse ferrite permanent magnet 142 and C shape ferrite permanent magnet 144 to export respectively are less, cause its efficient lower, and the pulsation of its output torque is bigger, so it only can be applied under the environment less to power demand, that required precision is not high.The following stated can solve the above-mentioned problems in the prior art according to embodiment of the present utility model.
As shown in Figure 3, be basic arc on the whole according to the permanent magnet 10 for magneto of the present utility model.Permanent magnet 10 comprises arch section 20 and is positioned at two linear segments 30 of the both sides of arch section 20 that each in the linear segment 30 is extended along the direction away from arch section 20 from arch section 20 respectively.Arch section 20 comprises first edge 21 of arc and second edge 22 of arc, and linear segment 30 comprises the 3rd edge 31 and the 4th edge 32 respectively.Wherein, at least one in the 3rd edge 31 and the 4th edge 32 is linear edge, and advantageously, the 3rd edge 31 and the 4th edge 32 are linear edge.The 3rd edge 31 extends from the end at first edge 21 of arc along the direction away from first edge 21 of arc respectively, and the 4th edge 32 extends from the end at second edge 22 of arc along the direction away from second edge 22 of arc respectively.In the embodiment shown in fig. 3, second edge 22 of arc and first edge 21 of arc are circular arc, and for having the circular arc of same center of circle O.Further, first edge 21 of the arc of arch section 20 and second edge 22 of arc have identical central angle, and its end is separately limited by the radius that overlaps respectively.That is to say that two radiuses that limit first edge 21 of arc overlap respectively with two radiuses at second edge 22 that limits arc, make arch section 20 form the annular shape of fan thus.As shown in Figure 3, second edge 22 of arc is by between radius OC and the OD
Limit, simultaneously, first edge 21 of arc is by between radius OE and the OF
Limit.Certainly, second edge 22 of first edge 21 of the arc of arch section 20 and arc can be for having excentric arc edge.In according to above-mentioned permanent magnet 10 of the present utility model, because the core of permanent magnet 10 has adopted the structure of circular arc, this will not only be convenient to the manufacturing of permanent magnet 10 and the filling in the magnet storage tank, and be conducive to reduce to adopt the pulsation of output torque of the motor of this permanent magnet.
As shown in Figure 3, the 4th edge 32 of the 3rd edge 31 of the straight line of linear segment 30 and straight line extends in parallel to each other.The 3rd edge 31 of straight line is to extend from the end at first edge 21 of arc along the direction away from first edge 21 of arc with the tangent mode in first edge 21 of arc, that is, first edge 21 of arc engages with the 3rd edge 31 of corresponding straight line at an E and some F respectively tangently; Simultaneously, the 4th edge 32 of straight line is to extend from the end at second edge 22 of arc along the direction away from second edge 22 of arc with the tangent mode in second edge 22 of arc, that is, second edge 22 of arc engages with the 4th edge 32 of corresponding straight line at a C and some D respectively tangently.The 3rd edge 31 of straight line and the 4th edge 32 of straight line are bonded into second edge 22 of first edge 21 of arc and arc respectively and make the 3rd edge 31 of straight line and the 4th edge 32 of straight line extend abreast.Certainly, the 3rd edge 31 of straight line and the 4th edge 32 of straight line also can extend by irrelevancy capablely, extend into such as both to have certain angle therebetween.Compare the surface area that has increased permanent magnet effectively according to aforesaid permanent magnet 10 of the present utility model with existing permanent magnet, this will be conducive to improve power density and the torque density of the motor that adopts this permanent magnet 10, thereby improve efficiency of motor.
Further, form angle theta between the 4th edge 32 of two straight lines at the two ends at second edge 22 of arc, the span of this angle theta is 58 ° to 72 °.In according to embodiment shown in Figure 3, because the 4th edge 32 of straight line forms with second edge 22 of arc respectively tangently, therefore, second edge, the 22 corresponding central angle ∠ COD of arc are 180 °-θ, are 108 ° to 122 °.And because first edge 21 of arc is limited by two groups of radiuses that overlap respectively with second edge 22 of arc, therefore, the scope of first edge, the 21 corresponding central angle ∠ EOF of arc is similarly 108 ° to 122 °.Advantageously, above-mentioned angle theta is 66 °, that is to say, second edge, 22 corresponding central angle ∠ EOF and the ∠ COD of first edge 21 of arc and arc are preferably 114 °.In addition, the radius R b at first edge 21 of arc is 1.5 times to 2.5 times of thickness W of permanent magnet 10, that is, and and 1.5≤Rb/W≤2.5.Advantageously, the radius R b at first edge 21 of arc is 2.096 times of thickness W of permanent magnet 10, that is, and and Rb/W=2.096.At this, the thickness W of permanent magnet 10 is the 3rd edge 31 that extends in parallel and the minimum range between the 4th edge 32, as shown in Figure 3.The above-mentioned relation of the radius R b at first edge 21 of arc and the thickness W of permanent magnet 10 is determined by experiment via the inventor, in the experimentation of determining above-mentioned relation, the inventor finds the too little diametrical magnetization control that then is unfavorable for adopting the rotor of this permanent magnet 10 of the value of Rb/W, can cause exporting the increase of the pulsation of torque in addition; Can obviously reduce the fan-out capability of motor if the value of Rb/W is too big.The value of the radius R b at first edge 21 of arc is chosen as 1.5 times to 2.5 times of thickness W of magnet and more advantageously Rb be 2.096 times of W, then be conducive to adopt the diametrical magnetization control of rotor of permanent magnet 10 and the pulsation that reduces the output torque of motor more, this can further improve efficiency of motor.
Advantageously, the end away from arch section 20 of the linear segment 30 of permanent magnet 10 forms magnetic pole circular arc 33, and magnetic pole circular arc 33 forms and makes the length at the 4th edge 32 of straight line greater than the length at the 3rd edge 31 of straight line.The aforesaid permanent magnet 10 that is provided with magnetic pole circular arc 33 in the end is conducive to reduce to adopt the pulsation of output torque of the motor of this permanent magnet 10, has improved the anti-demagnetization capability of permanent magnet 10 in motor operation course in addition.
In according to above-described embodiment of the present utility model, permanent magnet 10 advantageously is ferrite permanent magnet, and it can reduce the manufacturing cost of permanent magnetism step motor widely with respect to rare-earth permanent magnet.Certainly, as the skilled personnel can understand, permanent magnet 10 also can be for the permanent magnet of other types, such as rare-earth permanent magnet.
As shown in Figure 4, employing is shown according to the magneto 200 of permanent magnet 10 of the present utility model.Magneto 200 comprises stator module 220 and is contained in rotor assembly 240 in the inner chamber of stator module 220 rotatably.According to the prior art of structure electric rotating machine, by using armature spindle, rotor bearing and end cap rotor assembly 240 is positioned in the inner chamber of stator module 220.Stator module 220 defines along a plurality of stator tooths 222 of its radial direction towards the inner chamber extension of stator module 220.Each stator tooth 222 comprise from the extended neck of the base portion of stator module 220 and usually and neck form "T"-shaped end.The side of the end of two adjacent stator tooths 222 is separated from each other by notch.The winding 224 of stator module 220 is wound on the neck of each stator tooth 222, and is provided for making the magnetic field of rotor assembly 240 rotations when being supplied to electric current.
In according to above-mentioned magneto 200 of the present utility model, owing to adopted aforesaid end to have the ferrite permanent magnet 10 of linear segment 30, compare with ferrite permanent magnet motor of the prior art, its power density and torque density obtain bigger raising; Secondly, make the length at the 3rd edge 31 of straight line less than the circular arc pole end piece of the length at the 4th edge 32 of straight line because the ferrite permanent magnet 10 that adopts has, can reduce thus magneto 200 the output torque pulsation and improve permanent magnet 10 and the anti-demagnetization capability of corresponding magneto 200; Again, because the core of permanent magnet 10 has adopted the form of isocentric circular arc, this makes and to be conducive to more permanent magnet 10 is filled in the magnet storage tank 242 in the rotor assembly 240 of magneto 200, has also reduced the pulsation of the output torque of magneto 200 simultaneously.
The inventor draws through verification experimental verification, compares with the ferrite permanent-magnet motor of equal model of the prior art according to ferrite permanent-magnet motor 200 of the present utility model, and the pulsation of its output torque descends 30% ~ 50%.As shown in Figure 5, illustrate according to the ferrite permanent-magnet motor of prior art with according to the correlation curve figure of the output torque time to time change of ferrite permanent magnet motor of the present utility model.Wherein, be 1.0009Nm according to the difference between the peak value of the output torque of the ferrite permanent-magnet motor of prior art, and be 0.3186Nm according to the difference between the peak value of the output torque of ferrite permanent-magnet motor 200 of the present utility model.This shows, reduced it widely according to ferrite permanent-magnet motor 200 of the present utility model and exported the pulsation of torque, can correspondingly improve efficiency of motor thus.
Though with reference to illustrative embodiments the utility model is described, but be to be understood that, the utility model is not limited in the literary composition embodiment describing in detail and illustrate, under the situation that does not depart from claims institute restricted portion, those skilled in the art can make various modifications and variations to described illustrative embodiments.
Claims (18)
1. permanent magnet (10) that is used for rotor is characterized in that described permanent magnet (10) comprising:
Arch section (20), described arch section (20) have first edge (21) of arc and second edge (22) of arc; And
Linear segment (30), described linear segment (30) extends along the direction away from described arch section (20) from described arch section (20), described linear segment (30) has the 3rd edge (31) and the 4th edge (32), wherein, at least one in described the 3rd edge (31) and described the 4th edge (32) is linear edge.
2. the permanent magnet for rotor as claimed in claim 1 (10), wherein, described the 3rd edge (31) and described the 4th edge (32) are linear edge.
3. the permanent magnet for rotor as claimed in claim 1 or 2 (10), wherein, first edge (21) of the described arc of described arch section (20) and second edge (22) of described arc are for having the circular arc of the same center of circle (O).
4. the permanent magnet for rotor as claimed in claim 3 (10), wherein, described arch section (20) is the annular shape of fan.
5. the permanent magnet for rotor as claimed in claim 2 (10), wherein, described the 3rd edge (31) is parallel to each other with described the 4th edge (32).
6. the permanent magnet for rotor as claimed in claim 2 (10), wherein, described the 3rd edge (31) and described the 4th edge (32) engage with first edge (21) of described arc and second edge (22) of described arc respectively tangently.
7. the permanent magnet for rotor as claimed in claim 2 (10), wherein, the scope that is positioned at the angle (θ) that forms between the 4th edge (32) separately of linear segment (30) at two ends of described permanent magnet (10) is 58 ° to 72 °.
8. the permanent magnet for rotor as claimed in claim 7 (10), wherein, the value of described angle (θ) is 66 °.
9. the permanent magnet for rotor as claimed in claim 1 or 2 (10), wherein, the radius (Rb) at first edge (21) of the arc of the arch section (20) of described permanent magnet (10) is 1.5 times to 2.5 times of magnet thickness (W).
10. the permanent magnet for rotor as claimed in claim 9 (10), wherein, the radius (Rb) at first edge (21) of described arc is 2.096 times of described magnet thickness (W).
11. the permanent magnet for rotor as claimed in claim 1 or 2 (10) wherein, is formed with magnetic pole circular arc (33) in the outermost end of described linear segment (30).
12. the permanent magnet for rotor as claimed in claim 11 (10), wherein, described magnetic pole circular arc (33) forms and makes the length at described the 4th edge (32) greater than the length at described the 3rd edge (31).
13. the permanent magnet for rotor as claimed in claim 1 (10), wherein, described permanent magnet (10) is ferrite permanent magnet.
14. the rotor assembly of a magneto (240) comprising:
A plurality of magnet storage tanks (242), described a plurality of magnet storage tanks (242) are evenly spaced apart along the circumferential direction of described rotor assembly (240); With
Be arranged on the permanent magnet in each in described a plurality of magnet storage tanks (242), described permanent magnet is each the described permanent magnet (10) among the claim 1-13.
15. the rotor assembly of magneto as claimed in claim 14 (240) wherein, forms space (244) between the corresponding edge of the magnetic pole circular arc (33) of the end that is positioned at described permanent magnet (10) and corresponding described magnet storage tank (242).
16. as the rotor assembly (240) of claim 14 or 15 described magnetoes, wherein, in described rotor assembly (240), be provided with 6 described magnet storage tanks (242) and 6 described permanent magnets (10).
17. a magneto (200) comprising:
Stator module (220), described stator module (220) comprises the stator base portion and the radial direction along described stator module (220) is wound with winding (224) towards a plurality of stator tooths (222) of the inner chamber extension of described stator module (220) around each in described a plurality of stator tooths (222) from described stator base portion; And
Rotor assembly, described rotor assembly can be rotatably set in the inner chamber of described stator module (220), and described rotor assembly is the rotor assembly (240) of each described magneto among the claim 14-16.
18. magneto as claimed in claim 17 (200), wherein, described stator module (220) comprises 9 stator tooths (222).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320055662 CN203119645U (en) | 2013-01-31 | 2013-01-31 | Permanent magnet, rotor for an electric machine comprising such a permanent magnet and corresponding electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320055662 CN203119645U (en) | 2013-01-31 | 2013-01-31 | Permanent magnet, rotor for an electric machine comprising such a permanent magnet and corresponding electric machine |
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| Publication Number | Publication Date |
|---|---|
| CN203119645U true CN203119645U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320055662 Expired - Lifetime CN203119645U (en) | 2013-01-31 | 2013-01-31 | Permanent magnet, rotor for an electric machine comprising such a permanent magnet and corresponding electric machine |
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| CN (1) | CN203119645U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106469953A (en) * | 2015-08-18 | 2017-03-01 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of motor and its rotor |
| US10177617B2 (en) | 2016-12-02 | 2019-01-08 | Industrial Technology Research Institute | External rotor motor |
| CN112910197A (en) * | 2021-01-15 | 2021-06-04 | 浙江浙能技术研究院有限公司 | Novel magnetic steel processing method |
-
2013
- 2013-01-31 CN CN 201320055662 patent/CN203119645U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106469953A (en) * | 2015-08-18 | 2017-03-01 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of motor and its rotor |
| US10177617B2 (en) | 2016-12-02 | 2019-01-08 | Industrial Technology Research Institute | External rotor motor |
| CN112910197A (en) * | 2021-01-15 | 2021-06-04 | 浙江浙能技术研究院有限公司 | Novel magnetic steel processing method |
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| GR01 | Patent grant | ||
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Granted publication date: 20130807 |