CN113949223B

CN113949223B - Permanent magnet gear speed changing device

Info

Publication number: CN113949223B
Application number: CN202110267669.7A
Authority: CN
Inventors: 罗帅; 鲁仰辉; 于成伟; 魏立军; 李高盛; 严帅; 曹菡; 边卓伟
Original assignee: State Power Investment Group Science and Technology Research Institute Co Ltd
Current assignee: State Power Investment Group Science and Technology Research Institute Co Ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2023-07-14
Anticipated expiration: 2041-03-11
Also published as: CN113949223A

Abstract

The invention provides a permanent magnet gear speed changing device, and demonstrates that eddy current loss generated by end leakage is an important factor affecting the transmission efficiency of the permanent magnet gear speed changing device, and the end parts of an inner magnetic ring permanent magnet and/or an outer magnetic ring permanent magnet adopt magnetic shielding measures, namely a magnetic shielding ring is adopted to shield the end leakage of the inner magnetic ring permanent magnet and/or the outer magnetic ring permanent magnet, so that the eddy current loss in the permanent magnet gear speed changing device is reduced, and the transmission efficiency is improved. The permanent magnet gear speed change device provided by the embodiment of the invention has the advantages of low eddy current loss and high transmission efficiency, and the overall transmission efficiency of the permanent magnet gear speed change device is improved to more than 90%.

Description

Permanent magnet gear speed changing device

Technical Field

The invention relates to the technical field of permanent magnet gears, in particular to a permanent magnet gear speed change device with a magnetic adjusting ring.

Background

The permanent magnet gear speed changing device is widely applied to the transmission field, and because the driving wheel and the driven wheel are not in physical contact, the acting force of the permanent magnet magnetic field piece is utilized for transmission, the permanent magnet gear speed changing device is an ideal choice in the transmission field, and the permanent magnet gear speed changing device has the advantages of good performance and high reliability. The permanent magnet transmission comprises three main components: the inner magnetic ring, the outer magnetic ring and the magnetic regulating ring are used for fixing one part and the other two parts are used as movers so as to realize the transformation ratio function of speed and power. However, the problem of reduction of transmission efficiency caused by eddy current loss of the conventional permanent magnet gear speed changing device is not solved effectively all the time.

Disclosure of Invention

During performance testing of the permanent magnet gear shifting device, researchers in the field find that the transmission efficiency of the permanent magnet gear shifting device is low, and as the rotation speed increases, the loss power of the permanent magnet gear shifting device also increases. When the rotation speed of the high-speed end (the inner magnetic ring and the input shaft) of the permanent magnet gear speed changing device exceeds 500r/min, the efficiency of the permanent magnet gear speed changing device is lower than 50%. Researchers in the field research and found that, because the inner magnetic ring and the outer magnetic ring relatively move, an alternating magnetic field is formed in the permanent magnet gear speed changing device, and thus, the magnetic conduction conductive members (such as the inner magnetic ring permanent magnet, the outer magnetic ring permanent magnet, the inner magnetic ring iron core and the outer magnetic ring iron core) in the magnetic modulation ring, the inner magnetic ring and the outer magnetic ring are easy to form eddy current loss in the alternating magnetic field.

Thus, researchers in the field consider that the eddy current loss of the permanent magnet and the iron core is a main factor causing the loss of the permanent magnet gear speed changing device, in order to reduce the loss value of the permanent magnet gear speed changing device and improve the transmission efficiency, the researchers in the field improve the materials and the structures of the magnetic adjusting ring, the inner magnetic ring permanent magnet and the outer magnetic ring permanent magnet, and the permanent magnet speed changing device comprises: improvement of magnetic adjusting ring framework materials, improvement of magnetic adjusting ring frameworks and guide block structures, improvement of magnetic ring permanent magnet conductivity and the like. Through improvement, the loss value of the permanent magnet gear speed changing device is reduced, and the low quick-acting rate is close to 95%. However, as the rotational speed increases, the loss increases, and when the rotational speed of the high speed end reaches 1000r/min, the transmission efficiency is only 76%. This means that there is still a large eddy current loss inside the permanent magnet gear speed change device, which proves that there is a potentially important factor affecting the eddy current loss and transmission efficiency of the permanent magnet gear speed change device in addition to the magnetic adjusting ring, the inner magnetic ring and the outer magnetic ring.

The technical staff of the application continue to explore the permanent magnet gear speed changing device, and find that the permanent magnet end part of the permanent magnet gear speed changing device has obvious magnetic leakage, and the closer to the magnetic adjusting ring, the stronger the magnetic field is, and the more obvious the magnetic leakage is.

The technical staff of the application realizes that the existence of magnetic leakage enables the metal components around the permanent magnet to be in alternating magnetic field when the permanent magnet gear speed changing device works, especially the fluctuation of the magnetic field around the outer magnetic ring and the magnetic regulating ring is higher, so that the surrounding metal components generate larger eddy current loss, the transmission efficiency of the permanent magnet speed changing device is reduced, and the operation reliability of the metal components is also reduced.

The magnetic leakage of the permanent magnet cannot be avoided, and only a certain method can be adopted for shielding. Therefore, the embodiment of the invention provides a permanent magnet gear speed changing device which shields the end magnetic field of a permanent magnet by utilizing a magnetic shielding ring, and the permanent magnet gear speed changing device has the advantages of reduced eddy current loss and improved transmission efficiency.

According to an embodiment of the present invention, a permanent magnet gear speed change device includes: the inner magnetic ring comprises an inner magnetic ring permanent magnet and an inner magnetic ring iron core, the inner magnetic ring permanent magnet is arranged on the outer peripheral surface of the inner magnetic ring iron core, the outer magnetic ring comprises an outer magnetic ring permanent magnet and an outer magnetic ring iron core, and the outer magnetic ring permanent magnet is arranged on the inner peripheral surface of the outer magnetic ring iron core; wherein the permanent magnet gear shifting device further comprises: a first magnetic shielding ring and a second magnetic shielding ring, wherein the inner magnetic ring permanent magnet is positioned between the first magnetic shielding ring and the second magnetic shielding ring in the axial direction of the inner magnetic ring iron core so as to shield the end magnetic field of the inner magnetic ring permanent magnet; and/or a third magnetic shielding ring and a fourth magnetic shielding ring, wherein the outer magnetic ring permanent magnet is positioned between the third magnetic shielding ring and the fourth magnetic shielding ring in the axial direction of the inner magnetic ring iron core so as to shield the end magnetic field of the outer magnetic ring permanent magnet.

According to the permanent magnet gear speed changing device provided by the embodiment of the invention, the eddy current loss generated by end leakage is an important factor affecting the transmission efficiency of the permanent magnet gear speed changing device, and the end leakage of the inner magnetic ring permanent magnet and/or the outer magnetic ring permanent magnet is shielded by adopting a magnetic shielding measure, namely a magnetic shielding ring, so that the eddy current loss in the permanent magnet gear speed changing device is reduced, and the transmission efficiency is improved. The integral transmission efficiency of the permanent magnet gear speed changing device provided by the embodiment of the invention is improved to more than 90%.

Therefore, the permanent magnet gear speed changing device provided by the embodiment of the invention has the advantages of low eddy current loss and high transmission efficiency.

In some embodiments, the first magnetic shielding ring is formed by stacking a plurality of first silicon steel sheets, adjacent first silicon steel sheets are bonded and isolated from each other by a non-conductive adhesive layer, and the second magnetic shielding ring is formed by stacking a plurality of second silicon steel sheets, adjacent second silicon steel sheets are bonded and isolated from each other by a non-conductive adhesive layer.

In some embodiments, the first end of the inner magnetic ring permanent magnet is flush with the first end of the inner magnetic ring core, the second end of the inner magnetic ring permanent magnet is flush with the second end of the inner magnetic ring core, and each of the inner magnetic ring permanent magnet and the inner magnetic ring core is sandwiched between the first magnetic shielding ring and the second magnetic shielding ring in the axial direction of the inner magnetic ring.

In some embodiments, the first end of the outer magnetic ring permanent magnet is flush with the first end of the outer magnetic ring core, the second end of the outer magnetic ring permanent magnet is flush with the second end of the outer magnetic ring core, and each of the outer magnetic ring permanent magnet and the outer magnetic ring core is sandwiched between the third magnetic shielding ring and the fourth magnetic shielding ring in an axial direction of the outer magnetic ring.

In some embodiments, the magnetism regulating ring, the inner magnetic ring, and the outer magnetic ring are coaxially arranged.

In some embodiments, the permanent magnet gear speed changing device further comprises an input shaft and an output shaft, the outer magnetic ring is a stator, the inner magnetic ring is in transmission connection with the input shaft, and the magnetic adjusting ring is in transmission connection with the output shaft.

In some embodiments, the inner magnetic ring further comprises an inner magnetic ring cylinder, the inner magnetic ring iron core is sleeved on the inner magnetic ring cylinder, the outer magnetic ring further comprises an outer magnetic ring cylinder, the outer magnetic ring cylinder is sleeved on the outer magnetic ring iron core, the magnetic ring comprises a magnetic ring skeleton and a magnetic conduction block embedded in the magnetic ring skeleton, and the magnetic conduction block is opposite to the inner magnetic ring permanent magnet and the outer magnetic ring permanent magnet in the radial direction of the inner magnetic ring.

In some embodiments, the magnetism adjusting ring, the inner magnetic ring, and the outer magnetic ring are coaxially arranged, and the input shaft, the output shaft, and the inner magnetic ring are coaxial.

In some embodiments, the permanent magnet gear shifting device further comprises: an outer support bearing supported between the outer magnet ring cylinder and the magnet adjusting ring skeleton in a radial direction of the inner magnet ring; and an inner support bearing, one end of the output shaft extends into the inner magnetic ring cylinder, and the inner support bearing is supported between the one end of the output shaft and the inner magnetic ring cylinder in the radial direction of the inner magnetic ring.

In some embodiments, the permanent magnet gear shifting device further comprises: the inner magnetic ring flange is sleeved on the input shaft and connected with the inner magnetic ring so that the inner magnetic ring is in transmission connection with the input shaft; and the magnetic adjusting ring flange is sleeved on the output shaft and connected with the magnetic adjusting ring framework so that the magnetic adjusting ring is in transmission connection with the output shaft.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of a magnetism adjusting ring according to a first embodiment of the present invention.

Fig. 2 is a partial cross-sectional view of the magnetically modulated ring of the embodiment of fig. 1.

Fig. 3 is a schematic structural diagram of the magnetic conductive block in the embodiment of fig. 1.

Fig. 4 is a cross-sectional view of the magnetic flux pad of fig. 2.

Fig. 5 is a schematic view of the structure of the ring in the embodiment of fig. 1.

Fig. 6 is a schematic diagram of the magnetic conductive block in the embodiment of fig. 1.

Fig. 7 is a schematic structural view of the fixing block in the embodiment of fig. 1.

Fig. 8 is a schematic structural view of the collar in the embodiment of fig. 1.

Fig. 9 is a schematic diagram of another structure of a magnetism adjusting ring according to the first embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a casting type magnetism adjusting ring according to a second embodiment of the present invention.

Fig. 11 is a partial cross-sectional view of the cast-in-place magnetic tuning ring of the embodiment of fig. 10.

Fig. 12 is a schematic view of the structure of the reinforcing column in the embodiment of fig. 10.

Fig. 13 is a schematic structural view of the first end ring in the embodiment of fig. 10.

Fig. 14 is a schematic structural view of the second end ring in the embodiment of fig. 10.

Fig. 15 is a schematic structural diagram of the magnetic conductive block in the embodiment of fig. 10.

Fig. 16 is a schematic structural diagram of the magnetic conductive block and the positioning column in the embodiment of fig. 10.

FIG. 17 is a schematic view of the structure of the reinforcing spacer ring in the embodiment of FIG. 10.

Fig. 18 is a schematic structural view of a permanent magnet gear shifting device in accordance with a third embodiment of the present invention.

Fig. 19 is a schematic structural view of a permanent magnet gear shifting device in accordance with a fourth embodiment of the present invention.

Fig. 20 is a schematic structural view of a permanent magnet gear shifting device in a fifth embodiment according to the present invention.

Fig. 21 is a transmission efficiency curve of a permanent magnet gear shifting device according to a fifth embodiment of the present invention.

Fig. 22 is a schematic structural view of a magnetic shield ring in a fifth embodiment according to the present invention.

Fig. 23 is a schematic structural view of a permanent magnet gear shifting device in a sixth embodiment according to the present invention.

Reference numerals:

a magnetic adjusting ring 001; pouring a magnet adjusting ring 002; permanent magnet gear shifting device 003; an inner magnetic ring 004; an inner magnetic ring permanent magnet 0041; an inner magnetic ring core 0042; an inner magnetic ring cylinder 0043; an outer magnetic ring 005; an outer magnetic ring permanent magnet 0051; an outer magnetic ring iron core 0052; an outer magnetic ring cylinder 0053; an input shaft 0061; an output shaft 0062; an outer support bearing 0071; an inner support bearing 0072; inner magnetic ring flange 0081; magnetic ring flange 0082; a first magnetism regulating ring flange 0091; a second magnetism regulating ring flange 0092; a ring body 100; a mounting groove 110; a trough section 120; a first end ring 130a; a second end ring 140a; the parting strips 150; a magnetic conductive block 200a; a first dovetail 210; an intermediate portion 220; a second dovetail 230; a soft magnetic material sheet 240; a non-conductive adhesive layer 250; a fixed block 300; collar 400; a skeleton 0011; a magnetic conductive block 200; a magnetic conductive block 200b; a first side 201; a first positioning groove 2011; a second side 202; a second positioning groove 2021; a first end ring 130b; a first screw hole 131; a low speed shaft mounting hole 132; a second end ring 140b; a second screw hole 141; a reinforcing column 510; a first reinforcement column 511; a second reinforcing column 512; casting body 520; reinforcing spacer rings 530; a positioning hole 532; pouring holes 540; a first magnetic shield ring 610; a second magnetic shield ring 620; a third magnetic shield ring 630; a fourth magnetic shield ring 640, a silicon steel sheet 631; a non-conductive adhesive layer 632.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A permanent magnet gear shifting device 003 according to an embodiment of the present invention is described below with reference to fig. 20 to 23. As shown in fig. 20, the permanent magnet gear speed changing device 003 of the embodiment of the present invention includes an inner magnetic ring 004, a magnetic adjusting ring 001 and an outer magnetic ring 005.

The inner magnetic ring 004 comprises an inner magnetic ring permanent magnet 0041, an inner magnetic ring iron core 0042 and an inner magnetic ring cylinder 0043, wherein the inner magnetic ring permanent magnet 0041 is arranged on the outer circumferential surface of the inner magnetic ring iron core 0042, and the inner magnetic ring iron core 0042 is sleeved on the inner magnetic ring cylinder 0043. That is, the inner magnet ring permanent magnet 0041, the inner magnet ring core 0042 and the inner magnet ring cylinder 0043 are sequentially connected from outside to inside. Wherein the inner magnetic ring permanent magnet 0041 is connected with the outer circumferential surface of the inner magnetic ring iron core 0042, and the inner magnetic ring cylinder 0043 is connected with the inner circumferential surface of the inner magnetic ring iron core 0042.

The outer magnetic ring 005 comprises an outer magnetic ring permanent magnet 0051, an outer magnetic ring iron core 0052 and an outer magnetic ring cylinder 0053, wherein the outer magnetic ring permanent magnet 0051 is arranged on the inner circumferential surface of the outer magnetic ring iron core 0052, and the outer magnetic ring cylinder 0053 is sleeved on the outer magnetic ring iron core 0052. That is, the outer magnet ring permanent magnet 0051, the outer magnet ring core 0052, and the outer magnet ring cylinder 0053 are sequentially connected from inside to outside, the outer magnet ring permanent magnet 0051 is connected to the inner circumferential surface of the outer magnet ring core 0052, and the outer magnet ring cylinder 0053 is connected to the outer circumferential surface of the outer magnet ring core 0052.

The magnetic regulating ring 001 comprises a framework 0011 and a magnetic conducting block 200 embedded in the framework 0011. The inner magnetic ring 004, the magnetic adjusting ring 001 and the outer magnetic ring 005 are coaxially sleeved from inside to outside and are spaced from each other. And the magnetic conductive block 200 is opposed to the inner magnetic ring permanent magnet 0041 and the outer magnetic ring permanent magnet 0051 in the radial direction of the inner magnetic ring 004. That is, the magnetic tuning ring 001 is sleeved on the inner magnetic ring 004 and forms an air gap with the inner magnetic ring 004, and the outer magnetic ring 005 is sleeved on the magnetic tuning ring 001 and forms an air gap with the magnetic tuning ring 001.

According to the permanent magnet gear speed change device 003 provided by the embodiment of the invention, a magnetic field is formed between the inner magnetic ring 004 and the outer magnetic ring 005, the magnetic regulating ring 001 is arranged between the outer magnetic ring 005 and the inner magnetic ring 004, and the magnetic regulating ring 001 can cut magnetic lines of force between the outer magnetic ring 005 and the inner magnetic ring 004 so as to play a role in regulating magnetism, and a transformation ratio function of speed and power is realized.

The permanent magnet gear shifting device 003 of the embodiment of the present invention further includes a first magnetic shield ring 610 and a second magnetic shield ring 620 and/or a third magnetic shield ring 630 and a fourth magnetic shield ring 640.

The inner magnet ring permanent magnet 0041 is located between the first magnetic shield ring 610 and the second magnetic shield ring 620 in the axial direction of the inner magnet ring 004 so as to shield the end magnetic field of the inner magnet ring permanent magnet 0041. That is, the first magnetic shielding ring 610 and the second magnetic shielding ring 620 are respectively located at two sides of the inner magnetic ring permanent magnet 0041 in the axial direction of the inner magnetic ring 004, the magnetic field at the end of the inner magnetic ring permanent magnet 0041 is shielded by the first magnetic shielding ring 610 and the second magnetic shielding ring 620, that is, the magnetic field leaked at the end of the inner magnetic ring permanent magnet 0041 is intercepted by the first magnetic shielding ring 610 and the second magnetic shielding ring 620, so that the influence of the magnetic leakage at the end of the inner magnetic ring permanent magnet 0041 on surrounding metal components (such as the inner magnetic ring flange 0081) is avoided, and eddy current loss is generated, thereby reducing the eddy current loss of the surrounding metal components, and further improving the transmission efficiency of the permanent magnet gear speed change device 003.

The outer magnetic ring permanent magnet 0051 is located between the third magnetic shield ring 630 and the fourth magnetic shield ring 640 in the axial direction of the inner magnetic ring 004 so as to shield the end magnetic field of the outer magnetic ring permanent magnet 0051. That is, the third magnetic shielding ring 630 and the fourth magnetic shielding ring 640 are respectively located at two sides of the outer magnetic ring permanent magnet 0051 in the axial direction of the inner magnetic ring 004, the end magnetic field of the outer magnetic ring permanent magnet 0051 is shielded by the third magnetic shielding ring 630 and the fourth magnetic shielding ring 640, that is, the magnetic field leaked from the end of the outer magnetic ring permanent magnet 0051 is intercepted by the third magnetic shielding ring 630 and the fourth magnetic shielding ring 640, so that the influence of the end magnetic leakage of the outer magnetic ring permanent magnet 0051 on surrounding metal components (such as the outer support bearing 0071) is avoided, the eddy current loss of the surrounding metal components is reduced, and the transmission efficiency of the whole machine is improved.

According to the permanent magnet gear speed changing device provided by the embodiment of the invention, the eddy current loss generated by end leakage is an important factor affecting the transmission efficiency of the permanent magnet gear speed changing device, and the end part of the outer magnetic ring permanent magnet is shielded by adopting a magnetic shielding measure, namely a magnetic shielding ring, so that the eddy current loss in the permanent magnet gear speed changing device is reduced, and the transmission efficiency is improved. The overall transmission efficiency of the permanent magnet gear speed changing device provided by the embodiment of the invention is improved to more than 90 percent (shown in figure 21).

Therefore, the permanent magnet gear speed changing device provided by the embodiment has the advantages of low eddy current loss and high transmission efficiency.

The permanent magnet gear shifting device 003 provided by the present invention is further described in several embodiments below.

Embodiment one:

as shown in fig. 1, in the present embodiment, the magnetic tuning ring 001 includes a ring body 100 and a magnetic conductive block 200a, and the ring body 100 serves as a skeleton 0011 of the magnetic tuning ring 001. The ring body 100 is magnetically non-conductive.

As shown in fig. 2, the ring body 100 is provided with a plurality of mounting grooves 110 arranged at intervals along the circumferential direction of the ring body 100, and preferably, the length direction of the mounting grooves 110 is along the axial direction of the ring body 100. The plurality of magnetic conductive blocks 200a are embedded in the mounting groove 110 of the ring body 100 in a one-to-one correspondence. The cross-sectional profile of each of the magnetic blocks 200a is adapted to the cross-sectional profile of its corresponding mounting groove 110, and both sides of the magnetic block 200a are in contact with the wall surfaces of the corresponding mounting groove 110.

As shown in fig. 3 and 4, the magnetic conductive block 200a according to the embodiment of the present invention has a first dovetail portion 210, a middle portion 220, and a second dovetail portion 230, and the middle portion 220 is connected to each of the first dovetail portion 210 and the second dovetail portion 230.

The size of the first dovetail part 210 gradually increases from inside to outside and forms surface contact with the wall surface of the mounting groove 110, that is, two limiting contact surfaces are formed between two sides of the first dovetail part 210 and the wall surface of the mounting groove 110, so as to limit the magnetic conduction block 200a from being separated from the mounting groove 110 inwards under the action of a magnetic field. The second dovetail part 230 gradually increases from outside to inside, and two limiting contact surfaces are formed between two sides of the second dovetail part and the wall surface of the mounting groove 110, so as to limit the magnetic conductive block 200a from being separated from the mounting groove 110 outwards under the action of a magnetic field or centrifugal force. Therefore, a stable limit relationship is formed between the magnetic conductive block 200a and the ring body 100 in the embodiment of the invention, so that the magnetic conductive ring 001 in the embodiment of the invention has good structural integrity, stability, structural strength and rigidity.

As shown in fig. 2 and 4, the contact surface between the first dovetail part 210 and the wall surface of the mounting groove 110 is a plane, and the contact surface between the second dovetail part 230 and the wall surface of the mounting groove 110 is also a plane. That is, both side surfaces of the first dovetail part 210 are processed to be planar, and since the shape of the magnetic conductive block 200a is matched with the shape of the mounting groove 110, the portion of the mounting groove 110 contacting the first dovetail part 210 is also processed to be planar. The second dovetail 230 is the same.

Alternatively, the contact surface between the first dovetail part 210 and the wall surface of the mounting groove 110 may be an arc surface, and the contact surface between the second dovetail part 230 and the wall surface of the mounting groove 110 may also be an arc surface. That is, both side surfaces of the first dovetail part 210 are formed as arc surfaces, and since the shape of the magnetic conductive block 200a is matched with the shape of the mounting groove 110, the portion of the mounting groove 110 contacting the first dovetail part 210 is also formed as arc surfaces. The second dovetail 230 is the same.

Preferably, the arcuate sides of the first dovetail section 210 may be concave inwardly relative to the first dovetail section 210, resulting in a more rational construction than if the arcuate sides were convex outwardly relative to the first dovetail section 210.

It will be appreciated that the planar process is simpler than cambered, and therefore it is preferred that the contact surface of each of the first dovetail section 210 and the second dovetail section 230 with the wall of the mounting slot 110 be planar.

In this embodiment, a maximum dimension of each of the first dovetail section 210 and the second dovetail section 230 is greater than a maximum dimension of the intermediate section 220. As shown in fig. 4, both sides of the intermediate portion 220, which are opposite in the axial direction of the ring body 100, are planar. The outer end of the intermediate portion 220 has a slightly larger dimension than the inner end of the intermediate portion 220, that is, the cross-section of the intermediate portion 220 has an inverted trapezoidal profile with a gradually increasing dimension from the inside to the outside. The maximum dimension of middle portion 220 is at its outer end, the maximum dimension of first dovetail portion 210 is at its outer end, and the maximum dimension of second dovetail portion 230 is at its inner end, as can be seen in FIG. 1, each of first dovetail portion 210 and second dovetail portion 230 has a greater maximum dimension than middle portion 220. In addition, the side surfaces of the middle part 220 are all plane, so that the processing technology of the magnetic conduction block 200a is simpler, and the structure of the magnetic conduction block 200a is more reasonable.

The minimum dimension of the first dovetail section 210 is at its inner end, i.e., the position of the first dovetail section 210 that is connected to the intermediate section 220 is at its smallest dimension. The minimum dimension of second dovetail portion 230 is at its outer end, i.e., where second dovetail portion 230 is connected to intermediate portion 220, is at its smallest dimension. The minimum size of the first dovetail section 210 is greater than the minimum size of the second dovetail section 230.

It will be appreciated that the invention is not so limited. For example, the size of the middle portion 220 may remain the same from inside to outside, with the smallest dimension of the first dovetail portion 210 being equal to the smallest dimension of the second dovetail portion 230. In addition, in other embodiments, the middle portion 220 may be designed to have a structure with a narrow middle and wide ends, that is, each of the inner end and the outer end of the middle portion 220 has a size greater than that of at least a portion of the middle portion 220, and it is understood that the middle portion 220 satisfying the above conditions has a variety of structures, which are not exemplified herein.

As shown in fig. 5, the ring body 100 includes a first end ring 130a, a second end ring 140a, and a plurality of parting strips 150, the plurality of parting strips 150 being located between the first end ring 130a and the second end ring 140a in an axial direction of the ring body 100. A plurality of spacer bars 150 are circumferentially spaced about the ring body 100.

The ring body 100 is further provided with a plurality of groove sections 120 which are correspondingly connected with the mounting grooves 110 in one-to-one correspondence in the axial direction of the ring body 100, and the mounting grooves 110 and the groove sections 120 are formed between the adjacent parting strips 150. The magnetic conductive block 200a can enter the groove section 120 along the radial direction of the ring body 100 and enter the mounting groove 110 along the axial direction of the ring body 100. As shown in fig. 1 and 7, the magnetic flux adjusting ring 001 further includes a plurality of non-magnetic conductive fixing blocks 300, and the plurality of fixing blocks 300 are installed in the groove section 120 in a one-to-one correspondence so as to limit the magnetic conductive blocks 200a in the axial direction of the ring body 100. The shape and size of the fixing block 300 are adapted to the shape and size of the groove section 120.

In the schematic structural diagrams of the magnetism adjusting ring 001 shown in fig. 1 and fig. 5, the groove section 120 is closer to the first end ring 130a than the mounting groove 110. In another schematic structure of the magnetism adjusting ring 001 shown in fig. 9, the slot segment 120 is closer to the second end ring 140a than the mounting slot 110.

As shown in fig. 1 and 8, the magnetism adjusting ring 001 further includes a collar 400 provided on the outer circumferential surface of the ring body 100 and/or the inner circumferential surface of the ring body 100 to prevent the fixing block 300 from being removed from the groove section 120.

Alternatively, the size of the groove section 120 in the circumferential direction of the ring body 100 gradually decreases from outside to inside along the radial direction of the ring body 100, and the collar 400 is sleeved on the outer circumferential surface of the ring body 100 and abuts against the outer side surface of the fixing block 300. Alternatively, the groove 120 gradually increases in size in the circumferential direction of the ring body 100 from the outside to the inside in the radial direction of the ring body 100, and the collar 400 is provided on the inner circumferential surface of the ring body 100 and abuts against the inner side surface of the fixing block 300. Alternatively, the dimensions of the groove segments 120 in the circumferential direction of the ring body 100 are kept constant from the outside to the inside in the radial direction of the ring body 100, and collars 400 are provided on both the outer circumferential surface of the ring body 100 and the inner circumferential surface of the ring body 100.

In other embodiments, the ring body 100 may not have the groove segments 120, one end of the spacer bar 150 is integrally formed with the second end ring 140a, the other end of the spacer bar 150 is detachably connected to the first end ring 130a, and the mounting groove 110 is formed between adjacent spacer bars 150. That is, when the first end ring 130a is detached, one end of the mounting groove 110, which is far from the second end ring 140a, is opened, the magnetic conductive block 200a may be installed in the mounting groove 110 along the axial direction of the magnetic flux ring 001, and then the first end ring 130a is connected with the other end of the parting bead 150, thereby firmly inserting the magnetic conductive block 200a into the mounting groove 110 of the ring body 100.

In this embodiment, the ring body 100 is a titanium alloy ring body 100. In other words, the ring body 100 is made of titanium alloy. It will be appreciated that the invention is not so limited. By adopting the titanium alloy with high strength to manufacture the ring body 100, the overall rigidity and strength of the magnetic tuning ring 001 can be further ensured, so that the magnetic tuning ring 001 can be used for bearing and power transmission of the permanent magnet gear speed changing device 003. Under the same power parameters of the speed changer, the magnetic modulation ring 001 is used as a power transmission port, so that the maximum transmission ratio and the maximum thrust can be obtained.

Optionally, the ring body 100 is a non-magnetic metal ring body 100, a non-magnetic alloy ring body 100, a glass fiber reinforced plastic ring body 100, a glass fiber ring body 100, a ceramic ring body 100, a carbon fiber ring body 100 or a resin material ring body 100. In other words, the material of the ring body 100 may be a non-magnetic metal, a non-magnetic alloy, glass fiber reinforced plastic, glass fiber, ceramic, carbon fiber, or resin material, etc. In addition, the material of the ring body 100 may be a non-magnetic conductive and non-conductive material, such as glass fiber reinforced plastic, glass fiber, carbon fiber or resin material.

Further, as shown in fig. 6, the magnetic conductive block 200a in the present embodiment is formed by stacking a plurality of soft magnetic material pieces 240, and adjacent soft magnetic material pieces 240 are bonded to and isolated from each other by a nonconductive adhesive layer 250. In other words, the magnetic conductive block 200a includes a plurality of soft magnetic material sheets 240 and a plurality of nonconductive adhesive layers 250, and the soft magnetic material sheets 240 and the nonconductive adhesive layers 250 are alternately arranged one by one and stacked on each other, i.e., the magnetic conductive block 200a is manufactured by stacking the soft magnetic material sheets 240, the nonconductive adhesive layers, the soft magnetic material sheets 240, and the nonconductive adhesive layers … … in an arrangement manner during manufacturing. Wherein soft magnetic material sheet 240 is an amorphous soft magnetic alloy sheet. In other words, in this embodiment, the soft magnetic material is an amorphous soft magnetic alloy. It will be appreciated that the invention is not so limited.

According to the magnetic regulating ring 001 provided by the embodiment of the invention, the magnetic conduction performance of the magnetic conduction block 200a can be improved by adopting a soft magnetic material and a non-conductive adhesive to manufacture the magnetic conduction block 200a, so that the loss can be reduced and the performance and transmission efficiency can be improved by adopting a high-performance magnetic conduction material to replace the existing iron core material. Therefore, the magnetic adjusting ring 001 is arranged to be of an embedded structure of the magnetic conducting block 200a with high-performance magnetic conducting materials, so that eddy current loss of the magnetic adjusting ring 001 can be reduced, the temperature in the box body of the speed changer is reduced, and the efficiency of the permanent magnet speed changer is improved. Moreover, the two adjacent soft magnetic material pieces 240 can be separated while the two adjacent soft magnetic material pieces 240 are bonded together by the non-conductive adhesive layer 250, so that a magnetic field is formed in each soft magnetic material piece 240, iron losses such as eddy current loss and hysteresis loss are reduced, heat generation is reduced, and magnetic regulation performance is improved.

Alternatively, the soft magnetic material sheet 240 is an iron sheet, a low-carbon steel sheet, an iron-silicon alloy sheet, an iron-aluminum alloy sheet, an iron-silicon-aluminum alloy sheet, a nickel-iron alloy sheet, an iron-cobalt alloy sheet, a soft magnetic ferrite sheet, an amorphous soft magnetic alloy sheet, or an ultra-microcrystalline soft magnetic alloy sheet. In other words, the soft magnetic material may be iron, low carbon steel, iron-silicon alloy, iron-aluminum alloy, iron-silicon-aluminum alloy, nickel-iron alloy, iron-cobalt alloy, soft magnetic ferrite, amorphous soft magnetic alloy, or ultra-microcrystalline soft magnetic alloy, or the like. It will be appreciated that the invention is not so limited.

Further, the thickness of the amorphous soft magnetic alloy sheet was 0.025mm. In other words, each amorphous soft magnetic alloy sheet has a length of 0.025mm in the axial direction of the ring body 100.

Embodiment two:

in this embodiment, the permanent magnet gear speed change device 003 adopts a casting type magnetic ring 002. The cast magnetically permeable ring 002 includes a skeleton 0011 and a magnetically permeable block 200b, the skeleton 0011 including a first end ring 130b, a second end ring 140b, and a number of reinforcement posts 510 connected to each of the first end ring 130b and the second end ring 140b. The magnetic conductive blocks 200b are located between the first end ring 130b and the second end ring 140b, and a casting body 520 formed by casting is provided between adjacent magnetic conductive blocks 200b.

The casting type magnetism adjusting ring 002 according to the embodiment of the present invention is described below with reference to fig. 10 to 17. As shown in fig. 10, the casting type magnetic flux regulating ring 002 according to the embodiment of the present invention includes a skeleton 0011 and a plurality of magnetic conductive blocks 200b.

The armature 0011 includes a first end ring 130b and a second end ring 140b that are opposite in the axial direction of the cast-in-place magnetic ring 002. The skeleton 0011 further includes a plurality of reinforcing columns 510, where the plurality of reinforcing columns 510 are arranged at intervals along the circumferential direction of the casting type magnetic flux ring 002, and a first end of each reinforcing column 510 is connected to the first end ring 130b, and a second end of each reinforcing column 510 is connected to the second end ring 140b.

The plurality of magnetic conductive blocks 200b are arranged at intervals along the circumferential direction of the casting type magnetic conductive ring 002 and are positioned between the first end ring 130b and the second end ring 140b in the axial direction of the casting type magnetic conductive ring 002, casting gaps are formed between the adjacent magnetic conductive blocks 200b, and non-magnetic conductive casting bodies 520 are filled in the casting gaps so that the casting bodies 520 are cast on the framework 0011 and the magnetic conductive blocks 200 b.

That is, the plurality of magnetic conductive blocks 200b are clamped between the first end ring 130b and the second end ring 140b in the axial direction of the casting type magnetic flux ring 002, the magnetic conductive blocks 200b, the reinforcing columns 510, the first end ring 130b and the second end ring 140b form a cage constituting the casting type magnetic flux ring 002, and the magnetic conductive blocks 200b and the reinforcing columns 510 serve as axial force carriers of the cage. In the circumferential direction of the casting type magnetic flux ring 002, a gap for casting the non-magnetic casting body 520, that is, a casting gap, is formed between two adjacent magnetic conductive blocks 200 b. Namely, in the circumferential direction of the casting type magnetic flux adjusting ring 002, the magnetic flux guiding blocks 200b and the casting body 520 are alternately arranged. Wherein the casting gap is defined by the magnetic conductive block 200b and the skeleton 0011, and the casting body 520 is formed by casting a casting material in the casting gap. The arrangement of the reinforcing column 510 improves the structural strength and rigidity of the casting type magnetic tuning ring 002.

The pouring type magnetic adjusting ring provided by the embodiment comprises a cage body formed by the magnetic conducting blocks, the reinforcing columns, the first end ring and the second end ring, and the pouring body is filled in a pouring gap formed between the adjacent magnetic conducting blocks, so that the magnetic adjusting ring structure with higher overall strength and rigidity is formed. Through experiments, when the casting type magnetic adjusting ring is used as a rotor in a permanent magnet gear speed changing device, the torque strength of the casting type magnetic adjusting ring can be up to 500MPa, the torque output of 15000NM is met, and the overall deformation of the casting type magnetic adjusting ring is smaller than 0.5mm. Therefore, the pouring type magnetic adjusting ring solves a plurality of problems of high-torque output of the hundred kilowatt-level permanent magnet gear speed changing device, opens up a technical route for developing the high-power high-torque permanent magnet gear speed changing device, and expands the application range of the permanent magnet gear speed changing device.

Moreover, it can be understood that the skeleton of the magnetic flux adjusting ring in the related art is generally integrally formed, and the integral skeleton is provided with a mounting groove for mounting the magnetic flux guiding block, which cannot be internally reinforced, and only a reinforcing ring can be arranged on the outer side or the inner side to enhance the structural strength and the rigidity, but the processing mode is complicated, the parts are more and the cost is higher. The pouring type magnetic adjusting ring in the embodiment firstly assembles the framework and the magnetic conducting blocks into a cage type structure, the cage type structure comprises a reinforcing column which can play a role in reinforcing, and then the gap between the magnetic conducting blocks is filled through pouring to form the integral magnetic adjusting ring, so that the processing mode is reasonable and simple.

Therefore, the pouring type magnetic adjusting ring provided by the embodiment has the advantages of high strength and rigidity, high bearing capacity and simple and reasonable processing mode.

It should be noted that the first end ring 130b may be a flange, and the second end ring 140b may be a flange, so that the casting type magnetic tuning ring 002 is in driving connection with the transmission shaft. As shown in fig. 10 and 13, the first end ring 130b has a flange structure and has a low-speed shaft mounting hole 132, and the low-speed shaft is connected with the first end ring 130b through the low-speed shaft mounting hole 132 so that the casting type magnetism adjusting ring 002 is in transmission connection with the low-speed shaft. Alternatively, both the first end ring 130b and the second end ring 140b may be coupled to flanges so that the cast-in-place magnetically modulated ring 002 is drivingly coupled to the drive shaft.

As shown in fig. 13 and 14, the first end ring 130b is provided with a plurality of first threaded holes 131, the second end ring 140b is provided with a plurality of second threaded holes 141, the first ends and the second ends of the reinforcing columns 510 are respectively provided with external threads, the first ends of the reinforcing columns 510 are respectively engaged in the first threaded holes 131 and the second ends of the reinforcing columns 510 are respectively engaged in the second threaded holes 141. The reinforcement post 510 is positioned and interconnected with the first end ring 130b and the second end ring 140b by a threaded fit.

Further, at least a portion of the reinforcing columns 510 form a plurality of reinforcing column groups, and the plurality of reinforcing column groups are in one-to-one correspondence with the plurality of magnetic conductive blocks 200b and are sequentially arranged at intervals along the circumferential direction of the casting type magnetic flux regulating ring 002. Each reinforcing column group includes a first reinforcing column 511 and a second reinforcing column 512, and each magnetic conductive block 200b is sandwiched between the first reinforcing column 511 and the second reinforcing column 512 of its corresponding reinforcing column group. It will be appreciated that the first reinforcement columns 511 may include one or more and the second reinforcement columns 512 may also include the first or more. Optionally, the first end of the magnetic conductive block 200b abuts against the first end ring 130b, the second end of the magnetic conductive block 200b abuts against the second end ring 140b, and the magnetic conductive block 200b is limited by the first end ring 130b and the second end ring 140b in the axial direction of the casting type magnetic conductive ring 002.

In other embodiments, a first end of the flux block 200b may be coupled to the first end ring 130b and a second end of the flux block 200b may be coupled to the second end ring 140 b. As an example, a plurality of first limiting grooves are formed on the end face, close to the second end ring 140b, of the first end ring 130b, which is arranged along the circumferential direction of the casting type magnetic adjusting ring 002 at intervals, a plurality of second limiting grooves are formed on the end face, close to the first end ring 130b, of the second end ring 140b, which is arranged along the circumferential direction of the casting type magnetic adjusting ring 002 at intervals, the plurality of first limiting grooves and the plurality of second limiting grooves are in one-to-one correspondence in the axial direction of the casting type magnetic adjusting ring 002, and the first end of each magnetic conducting block 200b extends into the first limiting groove, and the second end extends into the second limiting groove corresponding to the first limiting groove. Thereby, the magnetic conductive block 200b and the first end ring 130b and the second end ring 140b are limited in the axial direction, the circumferential direction and the radial direction of the casting type magnetic conductive ring 002.

As shown in fig. 11, in the present embodiment, all the reinforcing columns 510 constitute a plurality of reinforcing column groups, and one first reinforcing column 511 and one second reinforcing column 512 constitute one reinforcing column group. In other embodiments, only a portion of the reinforcing columns 510 may form a plurality of reinforcing column groups, and another portion of the reinforcing columns 510 are third reinforcing columns 510, where the third reinforcing columns 510 are uniformly distributed along the circumferential direction of the cast-in-place magnetic ring 002 to further strengthen the strength and rigidity of the cast-in-place magnetic ring 002.

Further, as shown in fig. 11, the first reinforcing columns 511 and the second reinforcing columns 512 in each pair of reinforcing column groups are arranged at intervals along the circumferential direction of the casting type magnetism adjusting ring 002. In other words, the first reinforcing columns 511 and the second reinforcing columns 512 are alternately arranged in the circumferential direction of the casting type magnetism adjusting ring 002. Each of the magnetic conductive blocks 200b is located between the first reinforcement leg 511 and the second reinforcement leg 512 of the corresponding reinforcement leg group in the circumferential direction of the casting type magnetic conductive ring 002.

As shown in fig. 11, 15 and 16, in order to better limit the magnetic conductive block 200b, the magnetic conductive block 200b has a first side 201 and a second side 202 opposite to each other in the circumferential direction of the casting type magnetic conductive ring 002. The first side 201 is provided with a first positioning groove 2011, at least a portion of the first reinforcing column 511 is fitted in the first positioning groove 2011, the second side 202 is provided with a second positioning groove 2021, and at least a portion of the second reinforcing column 512 is fitted in the second positioning groove 2021. Thereby, the magnetic conductive block 200b is restrained in the circumferential direction and the radial direction of the casting type magnetic flux adjusting ring 002 by the first reinforcing column 511 and the second reinforcing column 512. The magnetic conduction block 200b and the framework 0011 form a stable cage structure, and the overall structural stability of the casting type magnetic modulation ring 002 is improved.

It will be appreciated that the invention is not limited thereto, for example, in other embodiments, the first reinforcing leg 511 and the second reinforcing leg 512 of each pair of reinforcing leg groups are disposed inside and outside, and each magnetic permeable block 200b is located between the first reinforcing leg 511 and the second reinforcing leg 512 of the corresponding reinforcing leg group in the radial direction of the casting type magnetic permeable ring 002. The outer side surface of the magnetic conductive block 200b is provided with a first positioning groove 2011, at least a part of the first reinforcing column 511 is matched in the first positioning groove 2011, the inner side surface of the magnetic conductive block 200b is provided with a second positioning groove 2021, and at least a part of the second reinforcing column 512 is matched in the second positioning groove 2021.

Preferably, as shown in fig. 11, the magnetic conductive blocks 200b are equally spaced in the circumferential direction of the casting type magnetic flux regulating ring 002, so that the structure of the casting type magnetic flux regulating ring 002 is more reasonable.

Preferably, the length direction of the magnetic conductive block 200b and the length direction of the reinforcing column 510 extend along the axial direction of the casting type magnetic adjusting ring 002, so that the structure of the casting type magnetic adjusting ring 002 is more reasonable.

The contact between the reinforcing post 510 and the magnetic block 200b, and the insulation between the reinforcing post 510 and the first end ring 130b, and between the reinforcing post 510 and the second end ring 140b are processed to insulate the reinforcing post 510 from each of the magnetic block 200b, the first end ring 130b, and the second end ring 140 b. Optionally, the reinforcement post 510 is made of a non-magnetically conductive metallic material.

Further, as shown in fig. 14, a casting hole 540 is provided on the second end ring 140b, and the casting hole 540 communicates with each casting gap so as to inject casting material into the casting gap to form the casting body 520. In other embodiments, the casting holes 540 may also be provided on the first end ring 130b, or the casting holes 540 may be provided on each of the first end ring 130b and the second end ring 140 b.

As shown in fig. 10, the skeleton 0011 of the casting type magnetic tuning ring 002 in this embodiment includes a reinforcing spacer 530. The reinforcing spacer ring 530 is located between the first end ring 130b and the second end ring 140b in the axial direction of the cast-in-place magnetic ring 002. In order not to affect the installation of the reinforcing columns 510, as shown in fig. 17, a plurality of positioning holes 532 corresponding to the reinforcing columns 510 one by one are provided on the reinforcing spacer 530. The positioning holes 532 are through holes, and each reinforcing column 510 passes through a corresponding positioning hole 532. It is understood that in other embodiments, the skeleton 0011 of the cast-in-place magnetic tuning ring 002 may include a plurality of reinforcing spacer rings 530 spaced apart along the axial direction of the cast-in-place magnetic tuning ring 002.

As shown in fig. 10, each magnetic conductive block 200b includes two sub magnetic conductive blocks arranged along the axial direction of the casting type magnetic conductive ring 002, and the two sub magnetic conductive blocks and the reinforcing spacer 530 of each magnetic conductive block 200b are alternately arranged along the axial direction of the casting type magnetic conductive ring 002, that is, the reinforcing spacer 530 is located between two adjacent sub magnetic conductive blocks along the axial direction of the casting type magnetic conductive ring 002, and each sub magnetic conductive block abuts against the reinforcing spacer 530. Specifically, each magnetic conductive block 200b includes a first sub magnetic conductive block and a second sub magnetic conductive block, and in the axial direction of the casting magnetic conductive ring 002, the first sub magnetic conductive block, the reinforcing spacer 530 and the second sub magnetic conductive block are sequentially arranged, and the first sub magnetic conductive block and the second sub magnetic conductive block are all abutted against the reinforcing spacer 530.

It will be appreciated that when the reinforcing spacer 530 includes a plurality of sub-magnetic blocks, each magnetic block 200b includes more than two sub-magnetic blocks arranged along the axial direction of the casting type magnetic flux ring 002, the plurality of sub-magnetic blocks of each magnetic block 200b and at least one reinforcing spacer 530 are alternately arranged along the axial direction, each reinforcing spacer 530 is axially located between two adjacent sub-magnetic blocks, and each sub-magnetic block abuts against an adjacent reinforcing spacer 530.

Further, the dimension of the reinforcing spacer ring 530 in the radial direction of the casting type magnetic flux ring 002 is smaller than the dimension of the magnetic flux ring in the radial direction of the casting type magnetic flux ring 002, so as to form an annular casting runner communicated with each casting gap. That is, since the dimension of the reinforcing spacer ring 530 in the radial direction of the casting type magnetic flux ring 002 is smaller than the dimension of the magnetic conductive ring in the radial direction of the casting type magnetic flux ring 002, the inner side and/or the outer side of the reinforcing spacer ring 530 may form an annular casting runner which may communicate with each casting gap so that casting material may enter the annular casting runner through the casting gap, and casting material in the annular casting runner may also enter the casting gap so as to achieve that the casting material may be better filled in each casting gap.

Specifically, in this embodiment, after the installation of the magnetic conductive block 200b and the skeleton 0011 is completed, the casting cage structure is placed in the casting mold, the casting inner mold abuts against the inner end surface of the magnetic conductive block 200b, and the casting outer mold abuts against the outer end surface of the magnetic conductive block 200 b. The casting mold and the casting gap define a linear casting runner, the casting mold and the reinforcing spacer ring 530 form an annular casting runner, the linear casting runner and the annular casting runner are mutually communicated to form a casting runner, and casting materials are injected into the casting runner through casting holes 540 on the second end ring 140 b.

Pouring materials enter the pouring gaps through the pouring holes, flow into the annular pouring channels along the pouring gaps, and flow into the pouring gaps again and in the direction close to the first end ring 130b after flowing through the annular pouring channels until the pouring materials completely fill the pouring gaps and the annular pouring channels.

In addition, due to the existence of the annular pouring channels, as shown in fig. 14, the number of pouring holes 540 on the second end ring 140b can be smaller than the number of pouring gaps, so that the processing amount of the pouring holes 540 is reduced, and the structural strength of the second end ring 140b is improved.

Further, in order to enable better circulation of the casting material, the reinforcing spacer 530 may also be provided with casting holes 540, and optionally, as shown in fig. 17, the casting holes 540 are located inside the positioning holes 532.

It should be noted that, in other embodiments of the present invention, the casting type magnetism adjusting ring 002 may not include the reinforcing spacer ring 530, and the effect of improving the structural strength and rigidity of the magnetism adjusting ring may be achieved as well, and in these embodiments, the second end ring 140b is provided with a plurality of casting holes 540, and the number of casting holes 540 is the same as and corresponds to the number of casting gaps one by one, and the casting holes 540 are communicated with the corresponding casting gaps, so that casting materials are injected into the casting gaps through the casting holes 540, and the casting materials are cured to form the casting body 520.

Embodiment III:

the permanent magnet gear shifting device 003 of the present embodiment is described below with reference to fig. 18. The permanent magnet gear change 003 includes an inner magnetic ring 004, an outer magnetic ring 005, a magnetism adjusting ring 001, an input shaft 0061 and an output shaft 0062, an outer support bearing 0071 and an inner support bearing 0072, an inner magnetic ring flange 0081 and a magnetism adjusting ring flange 0082. The inner magnetic ring 004 is connected with the input shaft 0061 in a transmission way, and the magnetic regulating ring 001 is connected with the output shaft 0062 in a transmission way. The input shaft 0061, output shaft 0062 and inner magnetic ring 004 are coaxial.

In this embodiment, the outer magnetic ring 005 is a stator, the inner magnetic ring 004 is a high-speed rotor, and the magnetic regulating ring 001 is a low-speed rotor, wherein the rotation directions of the inner magnetic ring 004 and the magnetic regulating ring 001 are the same, so that the transformation ratio function of speed and power is realized. Therefore, by taking the magnetic modulation ring 001 as a power transmission port, a larger transmission ratio and thrust can be obtained, and the transmission efficiency of the permanent magnet gear speed changing device 003 is improved.

It can be appreciated that when the permanent magnetic gear speed changing device 003 according to the embodiment of the present invention is used, the motor drives the input shaft 0061 to rotate and drives the inner magnetic ring 004 to rotate, so that the rotation of the inner magnetic ring 004 makes the magnetic force lines between the outer magnetic ring 005 and the inner magnetic ring 004 cut by the magnetic force lines of the magnetic force adjusting ring 001, and further, the rotating magnetic field is generated to drive the magnetic force adjusting ring 001 to rotate and the rotation is output through the output shaft 0062, so that the kinetic energy output by the motor is transmitted to the output shaft 0062 through the input shaft 0061, thereby forming a contactless magnetic gear transmission.

An outer support bearing 0071 is sleeved on the magnetism-adjusting ring skeleton 0011, the outer support bearing 0071 being located between the outer magnetism ring cylinder 0053 and the magnetism-adjusting ring skeleton 0011 in the radial direction of the inner magnetism ring 004 and being in contact with each of the outer magnetism ring cylinder 0053 and the magnetism-adjusting ring skeleton 0011. One end of the output shaft 0062 extends into the inner magnetic ring cylinder 0043, an inner support bearing 0072 is sleeved over the one end of the output shaft 0062, the inner support bearing 0072 being located radially of the inner magnetic ring 004 between the inner magnetic ring cylinder 0043 and the output shaft 0062 and in contact with each of the inner magnetic ring cylinder 0043 and the output shaft 0062.

The permanent magnet gear speed change device provided by the embodiment of the invention comprises the outer support bearing and the inner support bearing, wherein the outer support bearing plays a role in supporting the magnetic adjusting ring framework through the combined action of the inner support bearing and the outer support bearing, the inner support bearing plays a role in supporting the output shaft, and the magnetic adjusting ring and the output shaft rotate together, so that the magnetic adjusting ring realizes stable rotation under the combined action of the outer support bearing and the inner support bearing.

Therefore, the permanent magnet gear speed changing device provided by the embodiment of the invention has the advantage of good structural stability.

As shown in fig. 18, the lengths of the inner magnet ring core 0042, the inner magnet ring permanent magnet 0041, and the inner magnet ring cylinder 0043 in the axial direction of the inner magnet ring 004 are equal to each other. An inner magnetic ring flange 0081 is sleeved on the input shaft 0061 and is connected with the inner magnetic ring 004 so that the inner magnetic ring 004 is in transmission connection with the input shaft 0061. In other words, the inner magnetic ring 004 is in driving connection with the input shaft 0061 through an inner magnetic ring flange 0081. Specifically, inner magnetic ring flange 0081 is connected to inner magnetic ring barrel 0043. As shown in FIG. 18, input shaft 0061 is connected to inner magnetic ring flange 0081 from left to right. The input shaft 0061 and the output shaft 0062 are axially opposite to the inner magnetic ring 004, with one end of the output shaft 0062 extending from right to left into the inner magnetic ring cylinder 0043.

The magnetic ring flange 0082 is sleeved on the output shaft 0062 and connected with the magnetic ring skeleton 0011 so that the magnetic ring 001 is in transmission connection with the output shaft 0062. In other words, the magnetic tuning ring skeleton 0011 is in driving connection with the output shaft 0062 by being connected to the magnetic tuning ring flange 0082. The magnetic conductive block 200 embedded on the magnetic conductive ring skeleton 0011 is opposite to the inner magnetic ring permanent magnet 0041 and the outer magnetic ring permanent magnet 0051 in the radial direction of the inner magnetic ring 004.

As shown in fig. 18, the magnetism adjusting ring flange 0082 is connected to a side of the magnetism adjusting ring skeleton 0011 near the output shaft 0062. The length of the outer magnetic ring iron core 0052 and the outer magnetic ring permanent magnet 0051 in the axial direction of the inner magnetic ring 004 is smaller than the length of the outer magnetic ring cylinder 0053 in the axial direction of the inner magnetic ring 004. The outer magnet ring core 0052 and the outer magnet ring permanent magnet 0051 are equal in length and flush with each other, and the outer support bearing 0071 is located on the side of the outer magnet ring permanent magnet 0051 away from the output shaft 0062. Alternatively, outer support bearing 0071 is located on a side of each of outer magnetic ring permanent magnet 0051 and outer magnetic ring core 0052 that is remote from output shaft 0062. In the embodiment shown in fig. 18, the outer support bearing 0071 is located on the left side of the outer magnet ring permanent magnet 0051 (outer magnet ring core 0052).

Thus, the magnetism adjusting ring 001 realizes stable rotation by the combined action of the inner support bearing 0072 and the outer support bearing 0071.

Embodiment four:

a permanent magnet gear shifting device 003 of an embodiment of the present invention is described below with reference to fig. 19. The permanent magnet gear change 003 of the present embodiment is particularly suitable for a large diameter permanent magnet gear change 003.

The permanent magnet gear speed change device 003 comprises an inner magnetic ring 004, a magnetic regulating ring 001, an outer magnetic ring 005, an input shaft 0061, an output shaft 0062, an outer support bearing 0071, a first magnetic regulating ring flange 0091, a second magnetic regulating ring flange 0092, an inner support bearing 0072 and an inner magnetic ring flange 0081 which are coaxially sleeved from inside to outside and are spaced from each other.

The outer magnetic ring 005 is a stator, the inner magnetic ring 004 is in transmission connection with the input shaft 0061, the magnetic regulating ring 001 is in transmission connection with the output shaft 0062, namely the inner magnetic ring 004 and the magnetic regulating ring 001 are used as rotors, and the magnetic regulating ring 001 cuts magnetic lines between the inner magnetic ring 004 and the outer magnetic ring 005. Wherein, an air gap is arranged between the inner magnetic ring 004 and the magnetic modulation ring 001 and between the magnetic modulation ring 001 and the outer magnetic ring 005.

The input shaft 0061, the output shaft 0062 and the inner magnetic ring 004 are coaxial, that is, the central axes of the input shaft 0061, the output shaft 0062, the inner magnetic ring 004, the outer magnetic ring 005 and the magnetism adjusting ring 001 are mutually overlapped.

The first magnetic adjusting ring flange 0091 and the second magnetic adjusting ring flange 0092 are connected with the magnetic adjusting ring 001 and are respectively located at two sides of the inner magnetic ring 004 in the axial direction of the inner magnetic ring 004, the first magnetic adjusting ring flange 0091 is sleeved on the output shaft 0062 and connected with the output shaft 0062 so that the magnetic adjusting ring 001 is in transmission connection with the output shaft 0062, that is, the magnetic adjusting ring 001 is in transmission connection with the output shaft 0062 through the first magnetic adjusting ring flange 0091. In addition, the first magnetism adjusting ring flange 0091 plays a supporting role on the magnetism adjusting ring 001.

An outer support bearing 0071 is sleeved on the input shaft 0061, and a second magnetism adjusting ring flange 0092 is sleeved on the outer support bearing 0071 so that the input shaft 0061 can rotate relative to the second magnetism adjusting ring flange 0092. That is, the second magnetism adjusting ring flange 0092 is rotatably supported on the outer support bearing 0071 by being sleeved on the input shaft 0061 and the input shaft 0061, and the second magnetism adjusting ring flange 0092 is supported on the outer support bearing 0071, and because the outer support bearing 0071 is sleeved on the input shaft 0061, the second magnetism adjusting ring flange 0092 can support the magnetism adjusting ring 001 of the input shaft 0061 without affecting the rotation of the input shaft 0061 and the magnetism adjusting ring 001.

It can be appreciated that, since the first magnetic tuning ring flange 0091 and the second magnetic tuning ring flange 0092 are respectively located at two sides of the inner magnetic ring 004 in the axial direction of the inner magnetic ring 004, that is, the first magnetic tuning ring flange 0091 and the second magnetic tuning ring flange 0092 have a certain interval in the axial direction of the inner magnetic ring 004, the magnetic tuning ring 001 has two spaced supporting points in the axial direction of the inner magnetic ring 004, thereby ensuring the stability of the magnetic tuning ring 001 and avoiding the magnetic tuning ring 001 from jumping in the operation process.

An inner support bearing 0072 is fitted between the input shaft 0061 and the output shaft 0062 in the radial direction of the inner magnetic ring 004, i.e. through the inner support bearing 0072, both the input shaft 0061 and the input shaft 0061 can rotate with each other and the coaxiality of the input shaft 0061 and the output shaft 0062 can be ensured.

The permanent magnet gear speed changing device comprises an outer support bearing and an inner support bearing, wherein the outer support bearing is sleeved on an input shaft, and the inner support bearing is matched between the input shaft and an output shaft in the radial direction of an inner magnetic ring, so that the size requirements of the outer support bearing and the inner support bearing are not high, the permanent magnet gear speed changing device is particularly suitable for a large-diameter permanent magnet gear speed changing device, and the requirements of large torque and large size of a hundred kilowatt-level permanent magnet gear speed changing device can be met. This is because if the outer support bearing is sleeved on the magnetism adjusting ring to support the magnetism adjusting ring, the outer support bearing needs to be large in size, so that the cost and the manufacturing difficulty are increased.

In addition, the arrangement of the inner support bearing and the outer support bearing ensures the coaxiality of the permanent magnet gear speed changing device, simultaneously ensures the stability of an air gap between the inner magnetic ring and the magnetic adjusting ring and between the magnetic adjusting ring and the outer magnetic ring, avoids the scratch and the rub of the inner magnetic ring and the magnetic adjusting ring during rotation, and ensures the running performance and the running stability of the permanent magnet gear speed changing device.

Therefore, the permanent magnet gear speed changing device provided by the embodiment of the invention has the advantages of high structural stability and high coaxiality.

As shown in FIG. 19, an inner magnetic ring flange 0081 is sleeved over the input shaft 0061 and connected to the inner magnetic ring cylinder 0043 so that the inner magnetic ring 004 is in driving connection with the input shaft 0061. In this embodiment, the inner magnetic ring flanges 0081 include two, two inner magnetic ring flanges 0081 connected to each side of the inner magnetic ring cylinder 0043, respectively, to more firmly connect the inner magnetic ring 004 to the input shaft 0061. And, two inner magnetic ring flanges 0081 are located between the first magnetic adjusting ring flange 0091 and the second magnetic adjusting ring flange 0092 in the axial direction of the inner magnetic ring 004. It is to be appreciated that the present invention is not so limited and that the inner magnetic ring 004 may also be in driving connection with the input shaft 0061 in other ways, not illustrated herein.

As shown in fig. 19, in this embodiment, a first end of the output shaft 0062 is provided with a groove, and a first end of the input shaft 0061 extends into the groove along the axial direction of the inner magnetic ring 004, and the inner support bearing 0072 is located in the groove and is sleeved on the first end of the input shaft 0061.

It will be appreciated that the invention is not so limited. For example, in other embodiments, the first end of the input shaft 0061 is provided with a groove, the first end of the output shaft 0062 extends into the groove in the axial direction of the inner magnetic ring 004, and the inner support bearing 0072 is located in the groove and fits over the first end of the output shaft 0062.

Fifth embodiment:

during performance testing of the permanent magnet gear change 003, researchers in the field find that the transmission efficiency of the permanent magnet gear change 003 is low, and as the rotational speed increases, the power loss of the permanent magnet gear change 003 increases. When the speed of the high speed end of the permanent magnet gear transmission 003 (the inner magnetic ring 004 and the input shaft 0061) exceeds 500r/min, the efficiency of the permanent magnet gear transmission 003 is lower than 50%. Researchers in the field research and discovery that this is because the inner magnetic ring 004 and the outer magnetic ring 005 move relatively, and an alternating magnetic field is formed in the permanent magnet gear speed changing device 003, so that the magnetic conductive and conductive components (such as the inner magnetic ring permanent magnet 0041, the outer magnetic ring permanent magnet 0051, the inner magnetic ring iron core 0042 and the outer magnetic ring iron core 0052) in the magnetic adjusting ring 001, the inner magnetic ring 004 and the outer magnetic ring 005 are easy to form eddy current loss in the alternating magnetic field.

Thus, researchers in the field consider that the eddy current loss of the permanent magnet and the iron core is a main factor causing the loss of the permanent magnet gear speed changing device 003, in order to reduce the loss value of the permanent magnet gear speed changing device 003 and improve the transmission efficiency thereof, the researchers in the field improve the materials and the structures of the magnetic adjusting ring 001, the inner magnetic ring permanent magnet 0041 and the outer magnetic ring permanent magnet 0051, and the method comprises the following steps: improvement of magnetic adjusting ring framework materials, improvement of magnetic adjusting ring frameworks and guide block structures, improvement of magnetic ring permanent magnet conductivity and the like. Through improvement, the loss value of the permanent magnet gear speed changing device 003 is reduced, and the low quick-acting rate is close to 95%. However, as the rotational speed increases, the loss increases, and when the rotational speed of the high speed end reaches 1000r/min, the transmission efficiency is only 76%. This means that there is still a large eddy current loss inside the permanent magnet gear speed changing device 003, which proves that there is a potentially important factor affecting the eddy current loss and transmission efficiency of the permanent magnet gear speed changing device 003 in addition to the magnetic modulation ring 001, the inner magnetic ring 004 and the outer magnetic ring 005.

The skilled person in this application continues to conduct research experiments on the permanent magnet gear shifting device 003, and finds that the temperature rise at the outer support bearing 0071 in the third embodiment is the largest. Through researches, the permanent magnet end part of the permanent magnet gear speed changing device 003 has obvious magnetic leakage, and the closer to the magnetic modulation ring 001, the stronger the magnetic field is, and the more obvious the magnetic leakage is.

The skilled person realizes that the existence of magnetic leakage makes the permanent magnet gear speed changing device 003 in work, and the metal components around the permanent magnet are in alternating magnetic field, especially the magnetic field fluctuation around the outer magnetic ring 005 and the magnetic regulating ring 001 is higher, so that the surrounding metal components generate larger eddy current loss, the transmission efficiency of the permanent magnet speed changing device is reduced, and the operation reliability of the metal components is also reduced.

The magnetic leakage of the permanent magnet cannot be avoided, and only a certain method can be adopted for shielding. Therefore, the fifth embodiment of the present invention provides a permanent magnet gear transmission 003 in which the end magnetic field of the permanent magnet is shielded by a magnetic shield ring, and the eddy current loss of the permanent magnet gear transmission 003 is reduced and the transmission efficiency is improved.

The permanent magnet gear shifting device 003 of the present embodiment is described below with reference to fig. 20. As shown in fig. 20, the permanent magnet gear shifting device 003 of the present embodiment is similar to the permanent magnet gear shifting device 003 provided in the third embodiment, except that the permanent magnet gear shifting device 003 provided in the present embodiment further includes a third magnetic shield ring 630 and a fourth magnetic shield ring 640.

According to the permanent magnet gear speed changing device provided by the embodiment, the eddy current loss generated by end leakage is proved to be an important factor affecting the transmission efficiency of the permanent magnet gear speed changing device, and the end leakage of the outer magnetic ring permanent magnet is shielded by adopting a magnetic shielding measure at the end part of the outer magnetic ring permanent magnet, namely a magnetic shielding ring, so that the eddy current loss in the permanent magnet gear speed changing device is reduced, and the transmission efficiency is improved. The overall transmission efficiency of the permanent magnet gear speed changing device provided by the embodiment of the invention is improved to more than 90 percent (shown in figure 21).

It is to be understood that the present invention is not limited thereto and that the permanent magnet gear shifting device 003 may further include a first magnetic shield ring 610 and a second magnetic shield ring 620. The inner magnet ring permanent magnet 0041 is located between the first magnetic shield ring 610 and the second magnetic shield ring 620 in the axial direction of the inner magnet ring 004 so as to shield the end magnetic field of the inner magnet ring permanent magnet 0041. That is, the first magnetic shielding ring 610 and the second magnetic shielding ring 620 are respectively located at two sides of the inner magnetic ring permanent magnet 0041 in the axial direction of the inner magnetic ring 004, the magnetic field at the end of the inner magnetic ring permanent magnet 0041 is shielded by the first magnetic shielding ring 610 and the second magnetic shielding ring 620, that is, the magnetic field leaked at the end of the inner magnetic ring permanent magnet 0041 is intercepted by the first magnetic shielding ring 610 and the second magnetic shielding ring 620, so that the influence of the magnetic leakage at the end of the inner magnetic ring permanent magnet 0041 on surrounding metal components (such as the inner magnetic ring flange 0081) is avoided, and eddy current loss is generated, thereby reducing the eddy current loss of the surrounding metal components, and further improving the transmission efficiency of the permanent magnet gear speed change device 003.

Alternatively, the permanent magnet gear shifting device 003 may include only the first magnetic shield ring 610 and the second magnetic shield ring 620, without providing the third magnetic shield ring 630 and the fourth magnetic shield ring 640, that is, shielding only the end leakage of the inner magnet ring permanent magnet 0041.

As shown in fig. 22, the magnetic shield ring (the first magnetic shield ring 610, the second magnetic shield ring 620, the third magnetic shield ring 630, or the fourth magnetic shield ring 640) in the present embodiment is formed by stacking a plurality of silicon steel sheets 631, and the adjacent silicon steel sheets 631 are bonded to and isolated from each other by a nonconductive adhesive layer 632. Therefore, when the permanent magnet gear speed changing device 003 runs, magnetic leakage at the end part of the permanent magnet is mainly concentrated in the silicon steel sheet 631 of the magnetic shielding ring, and the eddy current loss of the silicon steel sheet 631 is much smaller than that of a large conductor, so that the eddy current loss of the permanent magnet gear speed changing device 003 is reduced, and the transmission efficiency is improved.

It should be noted that, in other embodiments, the magnetic shielding ring is formed by laminating a plurality of soft magnetic material layers, and adjacent soft magnetic material layers are bonded and isolated by a non-conductive adhesive layer, which may also play a role of magnetic shielding.

As shown in fig. 20, the outer magnetic ring permanent magnet 0051 and the outer magnetic ring iron core 0052 have opposite first end faces and second end faces in the axial direction of the inner magnetic ring 004, the first end face of the outer magnetic ring permanent magnet 0051 is flush with the first end face of the outer magnetic ring iron core 0052, the second end face of the outer magnetic ring permanent magnet 0051 is flush with the second end face of the outer magnetic ring iron core 0052, the third magnetic shielding ring 630 is in contact with both the first end face of the outer magnetic ring permanent magnet 0051 and the first end face of the outer magnetic ring iron core 0052, and the fourth magnetic shielding ring 640 is in contact with both the second end face of the outer magnetic ring permanent magnet 0051 and the second end face of the outer magnetic ring iron core 0052. Further, the outer side of each of the third magnetic shielding ring 630 and the fourth magnetic shielding ring 640 is connected with the inner side of the outer magnetic ring cylinder 0053, that is, the third magnetic shielding ring 630 and the fourth magnetic shielding ring 640 are mounted on the inner side of the outer magnetic ring cylinder 0053, so that the structure of the permanent magnet gear speed changing device 003 provided by the embodiment is more reasonable.

It should be noted that, the technical staff of the application realizes that the eddy current loss generated by the end leakage is an important factor affecting the transmission efficiency of the permanent magnet gear speed changing device, and takes corresponding measures, so that the eddy current loss in the permanent magnet gear speed changing device is reduced, and the transmission efficiency is improved.

Example six:

the permanent magnet gear shifting device 003 provided in this embodiment is a modification of the fourth and fifth embodiments, and the structure of the permanent magnet gear shifting device 003 provided in this embodiment is similar to that of the permanent magnet gear shifting device 003 provided in the fourth embodiment, except that the permanent magnet gear shifting device 003 provided in this embodiment further includes a first magnetic shield ring 610, a second magnetic shield ring 620, a third magnetic shield ring 630 and a fourth magnetic shield ring 640.

As shown in fig. 23, the inner magnet ring permanent magnet 0041 and the inner magnet ring iron core 0042 have opposite first and second end surfaces in the axial direction of the inner magnet ring 004, the first end surface of the inner magnet ring permanent magnet 0041 is flush with the first end surface of the inner magnet ring iron core 0042, the second end surface of the inner magnet ring permanent magnet 0041 is flush with the second end surface of the inner magnet ring iron core 0042, the first magnetic shielding ring 610 is in contact with both the first end surface of the inner magnet ring permanent magnet 0041 and the first end surface of the inner magnet ring iron core 0042, and the second magnetic shielding ring 620 is in contact with both the second end surface of the inner magnet ring permanent magnet 0041 and the second end surface of the inner magnet ring iron core 0042. That is, each of the inner magnet ring permanent magnet 0041 and the inner magnet ring core 0042 is sandwiched between the first magnetic shield ring 610 and the second magnetic shield ring 620 in the axial direction of the inner magnet ring 004.

The outer magnetic ring permanent magnet 0051 and the outer magnetic ring iron core 0052 are respectively provided with a first end face and a second end face which are opposite to each other in the axial direction of the inner magnetic ring 004, the first end face of the outer magnetic ring permanent magnet 0051 is flush with the first end face of the outer magnetic ring iron core 0052, the second end face of the outer magnetic ring permanent magnet 0051 is flush with the second end face of the outer magnetic ring iron core 0052, the third magnetic shielding ring 630 is in contact with the first end face of the outer magnetic ring permanent magnet 0051 and the first end face of the outer magnetic ring iron core 0052, and the fourth magnetic shielding ring 640 is in contact with the second end face of the outer magnetic ring permanent magnet 0051 and the second end face of the outer magnetic ring iron core 0052. That is, each of the outer magnetic ring permanent magnet 0051 and the outer magnetic ring core 0052 is sandwiched between the third magnetic shield ring 630 and the fourth magnetic shield ring 640 in the axial direction of the inner magnetic ring 004.

According to the permanent magnet gear speed changing device, magnetic shielding measures are adopted at the end parts of each of the inner magnetic ring permanent magnet and the outer magnetic ring permanent magnet, namely, magnetic shielding rings are adopted to shield end part leakage magnetism of the inner magnetic ring permanent magnet and the outer magnetic ring permanent magnet, so that eddy current loss in the permanent magnet gear speed changing device is reduced, and transmission efficiency is improved. Therefore, the permanent magnet gear speed changing device provided by the embodiment has the advantages of low eddy current loss and high transmission efficiency.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A permanent magnet gear shifting device, comprising:

The inner magnetic ring comprises an inner magnetic ring permanent magnet and an inner magnetic ring iron core, the inner magnetic ring permanent magnet is arranged on the outer peripheral surface of the inner magnetic ring iron core, the outer magnetic ring comprises an outer magnetic ring permanent magnet and an outer magnetic ring iron core, and the outer magnetic ring permanent magnet is arranged on the inner peripheral surface of the outer magnetic ring iron core;

wherein the permanent magnet gear shifting device further comprises:

a first magnetic shielding ring and a second magnetic shielding ring, wherein the inner magnetic ring permanent magnet is positioned between the first magnetic shielding ring and the second magnetic shielding ring in the axial direction of the inner magnetic ring iron core so as to shield the end magnetic field of the inner magnetic ring permanent magnet; and/or

A third magnetic shielding ring and a fourth magnetic shielding ring, wherein the outer magnetic ring permanent magnet is positioned between the third magnetic shielding ring and the fourth magnetic shielding ring in the axial direction of the inner magnetic ring iron core so as to shield the end magnetic field of the outer magnetic ring permanent magnet;

the first magnetic shielding ring is formed by stacking a plurality of first silicon steel sheets, adjacent first silicon steel sheets are bonded and isolated by a non-conductive adhesive layer, the second magnetic shielding ring is formed by stacking a plurality of second silicon steel sheets, and adjacent second silicon steel sheets are bonded and isolated by a non-conductive adhesive layer.

2. The permanent magnet gear shifting device according to claim 1, wherein a first end of the inner magnetic ring permanent magnet is flush with a first end of the inner magnetic ring core, a second end of the inner magnetic ring permanent magnet is flush with a second end of the inner magnetic ring core, and each of the inner magnetic ring permanent magnet and the inner magnetic ring core is sandwiched between the first magnetic shielding ring and the second magnetic shielding ring in an axial direction of the inner magnetic ring.

3. The permanent magnet gear shifting device according to claim 1, wherein a first end of the outer magnet ring permanent magnet is flush with a first end of the outer magnet ring core, a second end of the outer magnet ring permanent magnet is flush with a second end of the outer magnet ring core, and each of the outer magnet ring permanent magnet and the outer magnet ring core is sandwiched between the third magnetic shielding ring and the fourth magnetic shielding ring in an axial direction of the outer magnet ring.

4. The permanent magnet gear shifting device of claim 1, wherein the magnetic adjustment ring, the inner magnetic ring and the outer magnetic ring are coaxially arranged.

5. The permanent magnet gear shifting device according to claim 1, further comprising an input shaft and an output shaft, wherein the outer magnetic ring is a stator, the inner magnetic ring is in driving connection with the input shaft, and the magnetic ring is in driving connection with the output shaft.

6. The permanent magnet gear speed change device according to claim 5, wherein the inner magnetic ring further comprises an inner magnetic ring cylinder, the inner magnetic ring iron core is sleeved on the inner magnetic ring cylinder, the outer magnetic ring further comprises an outer magnetic ring cylinder, the outer magnetic ring cylinder is sleeved on the outer magnetic ring iron core, the magnetic ring comprises a magnetic ring skeleton and magnetic conductive blocks embedded in the magnetic ring skeleton, and the magnetic conductive blocks are opposite to the inner magnetic ring permanent magnets and the outer magnetic ring permanent magnets in the radial direction of the inner magnetic ring.

7. The permanent magnet gear shifting device of claim 6, wherein the magnetic shift ring, the inner magnetic ring and the outer magnetic ring are coaxially arranged, and the input shaft, the output shaft and the inner magnetic ring are coaxial.

8. The permanent magnet gear shifting device according to claim 7, further comprising:

an outer support bearing supported between the outer magnet ring cylinder and the magnet adjusting ring skeleton in a radial direction of the inner magnet ring; and

and one end of the output shaft extends into the inner magnetic ring cylinder, and the inner support bearing is supported between the one end of the output shaft and the inner magnetic ring cylinder in the radial direction of the inner magnetic ring.

9. The permanent magnet gear change according to any one of claims 5-8, further comprising:

the inner magnetic ring flange is sleeved on the input shaft and connected with the inner magnetic ring so that the inner magnetic ring is in transmission connection with the input shaft; and

and the magnetic adjusting ring flange is sleeved on the output shaft and connected with the magnetic adjusting ring framework so that the magnetic adjusting ring is in transmission connection with the output shaft.