KR20210112856A - rotor, method for manufacturing rotor, magnetic gear having the same, and propulsion module having the same - Google Patents

Abstract

The present invention relates to a magnetic gear. More particularly, the present invention relates to a rotor for a magnetic gear, a method for manufacturing the same, a magnetic gear including the same, and a propulsion module including the same. The magnetic gear includes: an inside magnetic flux portion (100) having an outer peripheral surface where permanent magnets (130) are coupled; an outside magnetic flux portion (300) coaxial with the inside magnetic flux portion (100) and having an inner peripheral surface where permanent magnets (330) are coupled; and a magnetic flux-adjusting pole piece unit (200) positioned between the outer peripheral surface of the inside magnetic flux portion (100) and the inner peripheral surface of the outside magnetic flux portion (300). At least one of the inside magnetic flux portion (100) and the outside magnetic flux portion (300) includes: an axially extending support main body (110, 310); and a permanent magnet module (120, 320) fixedly coupled to the support main body (110, 310) and sequentially installed in the axial direction. The permanent magnet module (120, 320) includes a fixing ring (140, 340) where the permanent magnets (130, 330) are fixedly coupled along the circumferential direction around the axis of rotation.

Description

Rotor for magnetic gear, manufacturing method thereof, magnetic gear including same, and propulsion module including same {rotor, method for manufacturing rotor, magnetic gear having the same, and propulsion module having the same}

The present invention relates to a magnetic gear, and more particularly, to a magnetic gear rotor, a method for manufacturing the same, a magnetic gear including the same, and a propulsion module including the same.

In general, a magnetic gear is a non-contact gear device that transmits power in a non-contact manner using magnetic force, unlike a contact gear that transmits power through physical contact. It is a gear device with excellent stability and durability because maintenance and inspection are unnecessary and there is no mechanical friction.

Furthermore, since the magnetic gear can reduce energy loss, it is a gear device capable of high-efficiency driving compared to a contact-type gear, and accurate peak torque transmission.

And the conventional magnetic gear, if it is a configuration using a magnetic method, various configurations are possible, and as an example, as disclosed in Patent Document 1, an inner rotor and an outer rotor to which a permanent magnet is coupled, and a magnetic body are installed at regular intervals. It may be configured to include a pole piece unit positioned between the inner rotor and the outer rotor to induce the rotation of the other through rotation according to the input rotation of any one of the inner rotor and the outer rotor by controlling magnetic flux.

Specifically, the conventional magnetic gear, as shown in the conceptual diagrams of FIGS. 1 and 2 , magnetic flux through each of the permanent magnets 11 and 31 according to the relative rotation between the inner rotor 10 and the outer rotor 30 . As a device for outputting power at a desired rotational speed ratio compared to the input through change induction, the inner rotor 10 and the outer rotor 30 and the inner rotor to control the magnetic flux between the inner rotor 10 and the outer rotor 30 It may include a pole piece unit 20 that is fixedly installed between the (10) and the outer rotor (30).

Here, the inner rotor 10 includes a plurality of pole piece units 20 in which N poles and S poles are alternately disposed and is installed to be rotatable.

And the outer rotor 30 includes a plurality of second permanent magnets 31 in which a preset number of N poles and S poles are alternately arranged in consideration of the rotation ratio with the inner rotor 10 and is installed to be rotatable. .

The pole piece unit 20 is fixedly installed between the inner rotor 10 and the outer rotor 30 to adjust the magnetic flux between the inner rotor 10 and the outer rotor 30 .

In particular, the pole piece unit 20 maintains a predetermined interval initially set between the inner rotor 10 and the outer rotor 30 even in a usage environment such as heat generation due to material loss due to high-speed rotation and frequency change. to achieve precise torque output.

On the other hand, the inner rotor 10 and the outer rotor 30 are a plurality of permanent magnets 11 and 31 arranged along the circumferential direction according to a preset gear ratio, and a plurality of permanent magnets 11 and 31 are fixed. It is configured to include a core (12, 32).

However, in the conventional magnetic gear, a plurality of permanent magnets 11 and 31 are fixed to the inner or outer circumferential surfaces of the cores 12 and 32 by an adhesive or the like. When the permanent magnets 11 and 31 are attached, the permanent magnets 11, 31 ), the arrangement is disturbed by the magnetic force, or the working time for fixing each permanent magnet 11, 31 is relatively increased, thereby greatly reducing productivity.

In addition, the conventional magnetic gear is manufactured by fixing a plurality of permanent magnets 11 and 31 to the inner or outer circumferential surfaces of the cores 12 and 32 by means of an adhesive. There is a problem in that it is difficult to attach the permanent magnets 11 and 31 in consideration of the gap.

Furthermore, the conventional magnetic gear has a problem in that it is difficult to manufacture and the manufacturing time is significantly increased when the number of permanent magnets 11 and 31 is increased in consideration of the gear ratio and the like.

(Patent Document 1) KR10-1457523 B1

An object of the present invention is to facilitate manufacturing and significantly reduce manufacturing costs by stacking an inner rotor and/or an outer rotor with an axial rotation module composed of a permanent magnet and a core in the axial direction in order to solve the above problems. An object of the present invention is to provide a rotor for a magnetic gear capable of doing so, a method for manufacturing the same, a magnetic gear including the same, and a propulsion module including the same.

The present invention was created to achieve the object of the present invention as described above, and the present invention includes an inner magnetic flux part 100 to which a plurality of permanent magnets 130 are coupled to an outer circumferential surface, and the inner magnetic flux part 100 and It is located between the outer peripheral surface of the outer magnetic flux part 300 and the outer peripheral surface of the inner magnetic flux part 100 and the inner peripheral surface of the outer magnetic flux part 300 coaxial and a plurality of permanent magnets 330 are coupled to the inner peripheral surface to adjust the magnetic flux. A magnetic gear including a pole piece unit 200, wherein at least one of the inner magnetic flux part 100 and the outer magnetic flux part 300 includes a support body (110, 310) extending in an axial direction; It is fixedly coupled to the support body (110, 310) and includes permanent magnet modules (120, 320) sequentially installed in the axial direction, wherein the permanent magnet modules (120, 320) include the plurality of permanent magnets (130, 330) discloses a magnetic gear, characterized in that it comprises a fixed ring (140, 340) fixedly coupled along the circumferential direction about the axis of rotation.

The permanent magnets 130 and 330 fixed to the fixing rings 140 and 340 may be arranged to have a skew angle while going in the axial direction.

The inner magnetic flux unit 100 and the outer magnetic flux unit 300 may have skew angles in different directions.

The fixing rings 140 and 340 are coupled in the axial direction with respect to the first keys 410 and 430 formed on the support bodies 110 and 310 so as to maintain a coupling angle with the support bodies 110 and 310. Second keys 420 and 440 may be formed.

It may include a housing 600 rotatably supporting the inner rotation shaft 150 of the inner magnetic flux part 100 and the outer rotation shaft 350 of the outer magnetic flux part 300 .

The housing 600 includes a housing body 610 that rotatably supports the outer magnetic flux part 300; A cover member 620 for rotatably supporting the inner magnetic flux part 100 may be included.

The present invention also includes a rotational force generating unit 2000 for generating a rotational force; a magnetic gear having the above configuration, the magnetic gear 1000 in which the rotational force generating unit 2000 is connected to any one of the inner rotation shaft 150 and the outer rotation shaft 350; A first propeller 3120 connected to any one of the inner rotation shaft 150 and the outer rotation shaft 350 of the magnetic gear 1000 and rotated to generate thrust and the inner rotation shaft of the magnetic gear 1000 ( 150) and a propulsion system including a thrust generating unit 3000 including a second propeller 3220 that is connected to the other one of the outer rotation shaft 350 and rotates to generate thrust.

The propulsion system may be a propulsion system of an aircraft or a marine vessel, a propulsion system of a drone, and the like.

A magnetic gear rotor, a method for manufacturing the same, a magnetic gear including the same, and a propulsion module including the same according to the present invention, an inner rotor and/or an outer rotor and an axial rotation module composed of a permanent magnet and a core are stacked in the axial direction Thus, there is an advantage that manufacturing is easy and manufacturing cost can be significantly reduced.

1 is a side view showing a conventional magnetic gear.
FIG. 2 is an exploded perspective view showing the configuration of the magnetic gear of FIG. 1 .
3 is a cutaway perspective view showing an example of a magnetic gear according to the present invention.
FIG. 4A is a cross-sectional view taken in a direction II-II in FIG. 3 .
4B and 4C are enlarged views of parts A and B in FIG. 4A.
4D is a graph showing the torque ripple reduction effect when the radially magnetized permanent magnet has the structure shown in FIGS. 4B and 4C.
FIG. 4e is a graph showing the torque ripple reduction effect when the permanent magnet of the radially magnetized inner rotor part has the structure shown in FIG. 4b.
FIG. 4f is a graph showing the torque ripple reduction effect when the permanent magnet of the radially magnetized inner rotor part has the structure shown in FIG. 4c.
5 is an exploded perspective view showing an inner magnetic flux unit, a pole piece unit, and an outer magnetic flux unit among the magnetic gears of FIG. 3 .
6A is a perspective view showing the configuration of an inner magnetic flux part of the magnetic gear of FIG. 3 .
6B is a cutaway perspective view showing the inner magnetic flux part of FIG. 6A .
7A is a perspective view illustrating a pole piece unit among the magnetic gears of FIG. 3 .
7B is a cross-sectional view of the pole piece unit of FIG. 7A.
8A is a perspective view showing the configuration of an outer magnetic flux part of the magnetic gear of FIG. 3 .
8B is a cutaway perspective view showing the outer magnetic flux part of FIG. 8A .
FIG. 9 is a photograph of the inner magnetic flux part shown in FIG. 6A , which is a photograph showing the inner magnetic flux part after the balancing process.
10 is a perspective view showing an example of a propellant to which a magnetic gear according to the present invention is applied.
11 is a cut-away perspective view of the propellant of FIG. 10 .
12 is a perspective view showing an example applied to a drone among the propellants to which the magnetic gear according to the present invention is applied.

Hereinafter, a rotor for a magnetic gear according to the present invention, a method for manufacturing the same, a magnetic gear including the same, and a propulsion module including the same will be described with reference to the accompanying drawings.

In the present invention, the magnetic gear, as shown in FIGS. 3 to 8b, is coaxial with the inner magnetic flux part 100 to which a plurality of permanent magnets 130 are coupled to the outer peripheral surface, and the inner magnetic flux part 100 and is located on the inner peripheral surface. A pole piece unit 200 positioned between the outer magnetic flux part 300 to which a plurality of permanent magnets 330 are coupled, and the outer peripheral surface of the inner magnetic flux part 100 and the inner peripheral surface of the outer magnetic flux part 300 to adjust the magnetic flux. include

The inner magnetic flux part 100 is a configuration in which a plurality of permanent magnets 130 are coupled to an outer circumferential surface, and various configurations are possible depending on a rotational or fixed structure.

For example, the inner magnetic flux part 100 is a rotatably installed structure, and is coupled to an inner core part 104 to which a plurality of permanent magnets 130 are coupled to an outer circumferential surface, and to the inner core part 104 . It may include an inner rotation shaft 150 that receives rotation input or output from the outside.

The inner core part 104 is a configuration in which a plurality of permanent magnets 130 are coupled to an outer circumferential surface and receives rotation input or output from the outside through the coupled inner rotation shaft 150 , and various configurations are possible.

The inner core part 104 is hollow so that the inner rotation shaft 150 can be coupled therethrough in the longitudinal direction, and a plurality of permanent magnets 130 can be coupled to the outer circumferential surface.

Through this, the inner core part 104 rotates the outer magnetic flux part 300 by the magnetic force acting through the plurality of permanent magnets 330 and the pole piece unit 200 installed in the outer magnetic flux part 300 . Or, it may be rotated by the external magnetic flux unit 300 .

And the inner core part 104 may be formed by stacking a plurality of electrical steel plates.

The permanent magnet 130 is a member coupled to the outer circumferential surface of the inner core portion 104 and through which magnetic force interacts with the plurality of permanent magnets 330 and the pole piece unit 200 installed in the outer magnetic flux portion 300 . As such, various configurations are possible.

For example, in the permanent magnet 130 , a plurality of N poles and S poles may be alternately disposed on the outer peripheral surface of the inner core part 104 in order, and the outer magnetic flux part 300 and the inner magnetic flux part 100 may be arranged alternately. ) can be arranged with a preset number and circumferential length in consideration of the rotation ratio.

In addition, the plurality of permanent magnets 130 may be disposed at the same interval, and more preferably, may be disposed and coupled to have the same area along the outer circumferential surface of the inner core part 104 .

In addition, the plurality of permanent magnets 130 may have a halved arrangement, and as shown in FIGS. 4A and 4B , only the corners of the permanent magnets of the radially magnetized N pole and S pole have a rounding shape (fillet). As shown in Fig. 4d, it was confirmed that, although there was little change in the torque, the torque ripple was greatly reduced.

Specifically, the plurality of permanent magnets 130 may have a halved arrangement along the circumferential direction, and among them, it is preferable that only the corners of the permanent magnets of the radially magnetized N pole and S pole have a rounding shape (fillet). do.

And the rounded shape of the corner of the permanent magnet 130, the radius (r ₁ ) is preferably 1.0 ~ 2.0mm, more preferably 1.5mm.

In summary, the plurality of permanent magnets 130 may have a halved arrangement along the circumferential direction, among which only the corners of the permanent magnets of the radially magnetized N and S poles have a rounding shape (fillet), rounding The general conditions for the shape are as follows.

That is, the rounding shape condition of the radially magnetized permanent magnet 130 among the permanent magnets 130 of the inner magnetic flux part 100 is, as shown in FIGS. 4b and 4e, the rounding shape curvature radius of r ₁ , When the length of the arc of the outer peripheral surface of the permanent magnet 130 is l ₂ , the 2×r ₁ /l ₂ value is preferably 13% to 39%, more preferably 39%. In Figure 4b, l ₁ is defined as the length of the arc of the inner peripheral surface of the permanent magnet (130).

The inner rotation shaft 150 passes through a hollow formed in the inner core portion 104 and is coupled to the inner core portion 104 to transmit the power of the inner core portion 104 to the outside, and various configurations are available. possible.

For example, the inner rotation shaft 150 passes through a hollow formed in the inner core portion 104 and is coupled to the inner core portion 104 , and when power is input to the inner magnetic flux portion 100 , the inner side Power transmitted from a power source coupled from the outside to the rotation shaft 150 may be transmitted to the inner core part 104 .

Conversely, the inner rotation shaft 150 may be rotated by a rotational force input by the outer rotation shaft 350 to be described later.

On the other hand, although the inner magnetic flux part 100 has been described as a rotatably installed embodiment, of course, it may be configured in a fixed state according to a rotation combination.

Meanwhile, in configuring the inner magnetic flux unit 100 , when attaching the plurality of permanent magnets 130 to the outer circumferential surface of the inner core unit 104 , there is a problem in that the permanent magnet attachment operation is not smooth due to the influence of magnetic force.

Accordingly, the inner magnetic flux part 100 is a plurality of permanent magnet modules 120 to which the permanent magnet 130 and the inner core part 104 to which the permanent magnet 130 is fixed are coupled in an axially divided state. can be composed by

That is, the inner magnetic flux portion 100, as shown in Figures 3 to 6b, the first support body 110 formed to extend in the axial direction; It may include a permanent magnet module 120 fixedly coupled to the first support body 110 and sequentially installed in the axial direction.

And the permanent magnet module 120, a plurality of permanent magnets 130 are fixedly coupled along the circumferential direction about the rotation axis (C), the first fixing ring 140 - the inner core portion 104 divided in the axial direction ) may be included.

The first support body 110 may be configured integrally with or separately from the inner rotation shaft 150 , and various configurations are possible as a configuration in which a plurality of permanent magnet modules 120 and 320 are coupled.

For example, in consideration of being configured as a part of the rotation shaft, the first support body 110 is preferably made of high-strength SUS, for example, SM45C, which is carbon steel for mechanical structure.

And the first support body 110, one or more bearings 720 are installed in a portion in contact with the outer rotation shaft 330 for rotatable support in the axial and/or radial direction with the outer rotation shaft 330 to be described later. can be

In this case, the first support body 110 may have a step 175 formed on the inner peripheral side for axial support of the bearing 720 .

Also, the first support body 110 may be rotatably installed with respect to the housing 600 to be described later by means of a shaft support bearing 730 .

In addition, the first support body 110 may have a hollow 178-type structure, as shown in FIG. 3 , in order to minimize the overall weight.

In addition, the second key 440 and the shaft formed on the inner circumferential surface of the first fixing ring 140 in order to fix the circumferential position of the first fixing ring 140 of the permanent magnet module 120 to be described later and to prevent slip. A first key 430 coupled in the direction may be formed in the axial direction.

The permanent magnet module 120 is fixedly coupled to the first support body 110 and is sequentially installed in the axial direction, and various configurations are possible.

For example, the permanent magnet module 120 includes a first fixing ring 140 in which a plurality of permanent magnets 130 and a plurality of permanent magnets 130 are fixedly coupled along a circumferential direction about a rotational axis C. may include

The first fixing ring 140 is a configuration in which a plurality of permanent magnets 130 are fixedly coupled along the circumferential direction about the rotation axis C to constitute one permanent magnet module 120, and various configurations are possible. do.

For example, the first fixing ring 140 is a configuration in which the inner core portion 104 is divided in the direction of the rotation axis C, and may be formed by stacking electrical steel sheets.

And the first fixing ring 140, as shown in Figure 4b, a plurality of permanent magnets 130 are formed with a plurality of projections 141 on the outer peripheral surface so that they can be arranged with a preset circumferential gap. have.

The plurality of protrusions 141 are formed to protrude from the outer circumferential surface of the first fixing ring 140 so that the plurality of permanent magnets 130 arranged in the circumferential direction can be stably arranged, and various configurations are possible. .

Each of the protrusions 141 may be formed to correspond to the circumferential width of the permanent magnets 130 so that the corresponding permanent magnets 130 can be positioned between the adjacent protrusions 141 .

On the other hand, the permanent magnet module 120 composed of the first fixing ring 140 and the permanent magnet 130 is preferably installed at a distance from the permanent magnet 130 of the adjacent permanent magnet module 120, It is preferable that the permanent magnet module 120 is installed with a gap member (not shown) made of a thin non-magnetic material such as insulating paper interposed therebetween.

And, as described above, the first fixing ring 140 is axial with respect to the first key 430 formed in the first support body 110 so as to maintain a coupling angle with the first support body 110 . A second key 440 coupled thereto may be formed.

Here, the first key 430 and the second key 440 are configured to maintain a coupling angle between the first fixing ring 140 and the first support body 110, and any one of them is elongated in the axial direction. The formed protrusion may be configured as a groove into which the other protrusion is inserted.

Meanwhile, the permanent magnet 130 fixed to the first fixing ring 140 may be disposed to have a _{skew angle (α 2 ) while going in the axial direction (C).}

The skew angle (α _{2 ) is a predetermined skew angle (α 2} ) with respect to the permanent magnet 130 fixed to the adjacent first fixing ring 140 while going in the axial direction (C), the circumference of the permanent magnet It may have various values depending on the direction length, the axial length, the number of batches, and the like.

Meanwhile, the inner magnetic flux unit 100 and the outer magnetic flux unit 300 may have skew angles in different directions.

The skew angle α ₂ is set to increase in one direction while going in the axial direction to reduce torque ripple, and various configurations are possible.

As described above, it was confirmed through analysis that, when an appropriate skew angle was placed in the arrangement of the permanent magnet 130, the torque was decreased while the torque ripple was greatly reduced.

Meanwhile, the plurality of permanent magnet modules 120 may be coupled by various methods, such as being bonded by an adhesive in the axial direction or mechanically coupled with an insulator interposed therebetween.

That is, the inner magnetic flux unit 100 includes a pair of axial fixing members 190 installed to face each other in the axial direction for axial fixing of the plurality of permanent magnet modules 120 arranged in the axial direction. may include

The pair of axial fixing members 190 are installed to face each other in the axial direction for axial fixing with respect to the plurality of permanent magnet modules 120 arranged in the axial direction, and SUS in consideration of structural rigidity etc. may be used.

In this case, the inner rotation shaft 150 of the inner magnetic flux part 100 may be formed with an extension support part 170 extending in a radial direction to support the axial direction fixing member 190 in the axial direction.

The axial fixing member 190 is configured to prevent the permanent magnet 130 from being separated in the axial direction, and a non-magnetic material such as PEEK is preferably used to prevent magnetic flux leakage.

The pole piece unit 200 is positioned between the outer peripheral surface of the inner magnetic flux part 100 and the inner peripheral surface of the outer magnetic flux part 300 to adjust the magnetic flux, and various configurations are possible.

Specifically, the pole piece unit 200 according to the present invention, as shown in Figures 3 to 5, Figures 7a and 7b, a plurality of pole pieces made of a magnetic material are installed spaced apart at regular intervals along the circumferential direction. members 220; a plurality of non-magnetic members 230 made of a non-magnetic material to which the pole piece member 220 maintains a distance between the adjacent pole piece members 220; A plurality of pole piece members 220 may be included.

The plurality of pole piece members 220 are magnetic materials that are installed to be spaced apart at regular intervals along the circumferential direction, and various configurations are possible.

For example, the plurality of pole piece members 220 may be installed to be spaced apart from each other at regular intervals along the circumferential direction, and according to the combination of the inner and outer permanent magnets 130 and 330 and the pole piece unit 200 , in advance A set number of pole piece members 220 may be installed.

On the other hand, the pole piece member 220 has a length corresponding to the longitudinal direction of the inner skin 210 according to the combination of the inner and outer permanent magnets 130 and 330 and the pole piece unit 200, in the longitudinal direction, that is, the axis It may have a structure in which a plurality of electrical steel sheets are stacked in the direction.

The plurality of non-magnetic members 230 are formed of a non-magnetic material, and the pole piece member 220 maintains a gap between the adjacent pole piece members 220 , and various configurations are possible.

For example, the non-magnetic member 230 is a configuration that maintains the position and shape of the pole piece members 220 by being installed in the space between the pole piece members 220 adjacent to each other, and various configurations are possible. .

The non-magnetic member 230 may be made of a material such as epoxy, engineering plastic such as PEEK, or glass fiber insulating material (composite material).

Meanwhile, the pole piece member 220 and the non-magnetic member 230 have a cylindrical shape installed with a predetermined gap from the outer peripheral surface of the inner magnetic flux part 100 and the outer magnetic flux part 200 .

In particular, the pole piece member 220 and the non-magnetic member 230 may have a cylindrical shape according to various structures.

For example, as shown in FIGS. 7A and 7B , the non-magnetic member 230 has a cylindrical shape as a whole and the pole piece member 220 is inserted so that the pole piece member 220 is positioned along the circumferential direction. The insertion groove 231 may be formed and configured.

In addition, the pole piece member 220 and the non-magnetic member 230 are alternately arranged along the circumferential direction, and inner skin and outer skin may be installed on the inner and outer sides to maintain the overall shape of the cylindrical member.

The inner skin may have a CFRP material installed with a preset gap from the outer peripheral surface of the inner magnetic flux unit 100 for support and fixation of the pole piece member 220 .

And the inner skin is formed on the outer peripheral surface formed by the plurality of non-magnetic members 230 to form the outer peripheral surface of the pole piece unit 200, the material may have a CFRP material.

Meanwhile, the pole piece unit 200 may be fixedly coupled to the housing 600 to be described later, and at this time, one end of the pole piece unit 200 may be fixedly coupled to the cover member 620 which is a part of the housing 600 . have.

And the other end, that is, the free end of the pole piece unit 200, the end support portion 371 of the outer magnetic flux unit 300 to be described later so as to maintain the distance to the inner magnetic flux unit 100 and the outer magnetic flux unit 300. With respect to the bearing 780 may be interposed and rotatably supported.

Meanwhile, at the other end of the pole piece unit 200 , a step 271 may be formed to support the bearing 780 in the axial direction.

And the pole piece unit 200, the material of the portion coupled to the housing 600 is preferably a non-magnetic material. If aluminum is used, eddy current loss may occur due to axial magnetic flux leakage due to the axial fringing effect, so it is preferable to apply a non-magnetic material such as PEEK.

The outer magnetic flux part 300 is a configuration in which a plurality of permanent magnets 330 are coupled to an inner circumferential surface, and various configurations are possible depending on the rotation or fixed structure.

For example, the external magnetic flux unit 300 includes a plurality of permanent magnets 330 in which a preset number of N poles and S poles are alternately arranged, and is a rotatably installed configuration, and various configurations are possible. do.

For example, the outer magnetic flux unit 300 includes a plurality of permanent magnets 330 coupled to an inner circumferential surface, an outer core portion 304 installed rotatably, and an outer core portion 304 coupled to the outside. It may include an outer rotation shaft 350 that outputs or receives rotation.

The outer core part 304 is a configuration for inputting or outputting rotation through an outer rotation shaft 350 that is installed to be rotatable and coupled thereto, and various configurations are possible.

For example, the outer core part 304 has a plurality of permanent magnets 330 coupled to an inner circumferential surface corresponding to the pole piece unit 200, and an outer rotation shaft 350 is disposed on at least one side of both sides in the longitudinal direction. are combined

More specifically, the outer core part 304 has a plurality of permanent magnets 330 installed on its inner circumferential surface, and the pole piece unit 200 and the inner magnetic flux part 100 concentrically formed therein can be installed therein. It is preferable to have a cylindrical shape.

Meanwhile, the outer core part 304 may be formed by stacking a plurality of electrical steel plates.

The plurality of permanent magnets 330 are coupled to the inner circumferential surface of the outer core portion 304 , and magnetic flux according to relative rotation through the plurality of permanent magnets 130 and the pole piece unit 200 of the inner magnetic flux portion 100 . As the configuration for inducing change, various configurations are possible.

For example, in the plurality of permanent magnets 330 , a plurality of N poles and S poles may be alternately disposed on the inner circumferential surface of the outer core part 304 in order, and the outer magnetic flux part 300 and the inner magnetic flux part In consideration of the rotation ratio of (100), it may be arranged with a preset number and circumferential length.

In addition, the plurality of permanent magnets 330 may be arranged at regular intervals along the circumferential direction, and more preferably, may be arranged and coupled to have a constant area along the inner circumferential surface of the outer core part 304 .

In addition, the plurality of permanent magnets 330 may have a half-thin arrangement, and as shown in FIGS. 4A and 4C , only the corners of the permanent magnets of the radially magnetized N pole and S pole have a rounding shape (fillet). As shown in Fig. 4d, it was confirmed that, although there was little change in the torque, the torque ripple was greatly reduced.

Specifically, the plurality of permanent magnets 330 may have a halved arrangement along the circumferential direction, and among them, it is preferable that only the corners of the N-pole and S-pole magnetized in the radial direction have a rounding shape (fillet). do.

And the rounded shape of the corner of the permanent magnet 330, the radius (r ₂ ) is preferably 1.0 to 2.0 mm, more preferably 1.5 mm.

Specifically, as shown in FIG. 4D , the torque ripple was the least when the rounding curvature of the permanent magnet 130 of the inner magnetic flux part 100 and the permanent magnet 330 of the outer magnetic flux part 300 was 1.5mm, and the rounding Compared to the model without curvature, torque ripple was reduced by about 53.8%.

In summary, the plurality of permanent magnets 330 of the outer magnetic flux part 300 may have a halved arrangement along the circumferential direction, among which only the corners of the permanent magnets of the N and S poles magnetized in the radial direction are rounded. (fillet), and the general condition of the round shape is as follows.

That is, the rounding shape condition of the radially magnetized permanent magnet 330 among the permanent magnets 330 of the outer magnetic flux part 300 is, as shown in FIGS. 4c and 4f, the rounding shape curvature radius of r ₂ , When the length of the arc of the inner circumferential surface of the permanent magnet 330 is m ₁ , the 2×r ₂ /m ₁ value is preferably 19% to 28%, more preferably 28%. In FIG. 4c , m ₂ is defined as the arc length of the outer peripheral surface of the permanent magnet 230 .

The outer rotation shaft 350 is coupled to at least one side of both sides based on the longitudinal direction of the outer core portion 304 to transmit the rotational force to the outside according to the change in the mutual magnetic flux of the inner magnetic flux portion 100 and the outer rotor portion 20 . Various configurations are possible by outputting or inputting rotational force to the inner magnetic flux unit 100 .

For example, the outer rotation shaft 350 is coupled to the outer core portion 304 , and when power is input to the outer magnetic flux portion 300 , it is transmitted from a power source coupled from the outside to the outer rotation shaft 350 . Power may be transmitted to the outer core part 304 .

Conversely, the outer rotation shaft 350 may be rotated by a rotational force input by the inner rotation shaft 150 .

On the other hand, although the external magnetic flux unit 300 has been described with reference to a rotatably installed embodiment, of course, it may be configured in a fixed state according to a rotation combination.

Meanwhile, in configuring the outer magnetic flux unit 300 , when attaching the plurality of permanent magnets 330 to the inner circumferential surface of the outer core unit 304 , there is a problem in that the permanent magnet attachment operation is not smooth due to the influence of magnetic force.

Accordingly, the outer magnetic flux part 300 is a plurality of permanent magnet modules 320 in which the permanent magnet 330 and the outer core part 304 to which the permanent magnet 330 is fixed are coupled in an axially divided state. can be composed by

That is, the outer magnetic flux part 300 includes, as shown in FIGS. 3 to 5 , 7A and 7B , a second support body 310 extending in the axial direction; It may include a permanent magnet module 320 fixedly coupled to the second support body 310 and sequentially installed in the axial direction.

And the permanent magnet module 320, a plurality of permanent magnets 330 are fixedly coupled along the circumferential direction with respect to the rotation axis C as the center, the second fixing ring 340 - the outer core part 304 divided in the axial direction. ) may be included.

The second support body 310 may be configured integrally with or separately from the outer rotation shaft 350 , and various configurations are possible as a configuration in which a plurality of permanent magnet modules 320 are coupled.

For example, in consideration of being configured as a part of the rotation shaft, the second support body 310 is preferably made of high-strength SUS, for example, SM45C, which is carbon steel for mechanical structure.

And the second support body 310, one or more bearings 740 at a portion in contact with the pole piece unit 200 for rotatable support in the axial and/or radial direction with the pole piece unit 200 at the free end. ) can be installed.

In this case, the second support body 310 may be provided as an integral member or as a separate member for the installation of the bearing 740 .

Meanwhile, one end of the second support body 310 is provided with a coupling hub 371 coupled to the outer rotation shaft 350 .

The coupling hub 371 is provided integrally with or separately from the second support body 310 to be coupled to the outer rotation shaft 350, and various configurations are possible.

The coupling hub 371 may be formed as a separate member or integrally with the outer rotation shaft 350 .

Meanwhile, the outer rotation shaft 350 may be rotatably installed with respect to the housing 600 , particularly the housing body 610 , to be described later by the shaft support bearing 710 .

In addition, the second fixing ring 340 is a second support body 310 to prevent the circumferential position fixing and slip of the second fixing ring 340 with respect to the second support body 310 to be described later. The first key 410 formed on the inner peripheral surface of the second key 420 coupled in the axial direction may be formed on the inner peripheral surface in the axial direction.

Here, the first key 410 and the second key 420 are configured to maintain a coupling angle between the second fixing ring 340 and the second support body 310, and any one of them is elongated in the axial direction. The formed protrusion may be configured as a groove into which the other protrusion is inserted.

The permanent magnet module 320 is fixedly coupled to the second support body 310 and is sequentially installed in the axial direction, and various configurations are possible.

For example, the permanent magnet module 320 includes a second fixing ring 340 in which a plurality of permanent magnets 330 and a plurality of permanent magnets 330 are fixedly coupled along a circumferential direction about a rotational axis C. may include

The second fixing ring 340 is a configuration in which a plurality of permanent magnets 330 are fixedly coupled along the circumferential direction about the rotation axis C to constitute one permanent magnet module 320, and various configurations are possible. do.

For example, the second fixing ring 340 is a configuration in which the outer core part 304 is divided in the direction of the rotation axis C, and may be formed by stacking electrical steel sheets.

And the second fixing ring 340, as shown in Figure 4c, a plurality of permanent magnets 330 are formed with a plurality of protrusions 341 on the inner circumferential surface so that they can be arranged with a preset circumferential gap. have.

The plurality of protrusions 341 are formed to protrude from the inner circumferential surface of the second fixing ring 340 so that the plurality of permanent magnets 330 arranged in the circumferential direction can be stably arranged, and various configurations are possible. .

Each of the protrusions 341 may be formed to correspond to the circumferential width of the permanent magnets 330 so that the corresponding permanent magnets 330 may be positioned between the adjacent protrusions 341 .

Meanwhile, the permanent magnet module 320 including the second fixing ring 340 and the permanent magnet 330 is preferably installed at a distance from the permanent magnet 330 of the adjacent permanent magnet module 320, and adjacent It is preferable that the permanent magnet module 320 is installed with a gap member (not shown) made of a thin non-magnetic material such as insulating paper interposed therebetween.

And as described above, the second fixing ring 340 in the axial direction with respect to the first key 410 formed in the second support body 310 so as to maintain the angle of engagement with the second support body 310 . A second key 420 coupled thereto may be formed.

Meanwhile, the permanent magnet 330 fixed to the second fixing ring 340 may be disposed to have a _{skew angle (α 1 ) while going in the axial direction (C).}

The skew angle (α _{1 ) is a preset skew angle (α 1} ) with respect to the permanent magnet 330 fixed to the adjacent second fixing ring 340 while going in the axial direction (C), and the circumference of the permanent magnet It may have various values depending on the direction length, the axial length, the number of batches, and the like.

Meanwhile, the inner magnetic flux unit 100 and the outer magnetic flux unit 300 may have skew angles in different directions.

Meanwhile, the plurality of permanent magnet modules 320 may be coupled by various methods, such as being bonded by an adhesive in the axial direction or mechanically coupled with an insulator interposed therebetween.

That is, the outer magnetic flux unit 300 includes a pair of axial fixing members 390 installed to face each other in the axial direction for fixing the plurality of permanent magnet modules 320 in the axial direction. may include

The axial fixing member 390 is configured to prevent the permanent magnet 330 from being separated in the axial direction, and a non-magnetic material such as PEEK is preferably used to prevent magnetic flux leakage.

Meanwhile, the assembly configuration having the axial fixing member 390 and the outer core portion 304 may be fixedly coupled to the shaft coupling portion 370 coupled to the outer rotation shaft 350 by a bolt or the like.

The shaft coupling portion 370 is fixedly coupled to the outer rotation shaft 350 and includes an assembly configuration having an axial fixing member 390 and an outer core portion 304 and a configuration for coupling the outer rotation shaft 350 to a hub or the like. can be configured.

Meanwhile, the magnetic gear according to the present invention may include a housing 600 in which the inner magnetic flux unit 100 , the pole piece unit 200 , and the outer magnetic flux unit 300 are stably installed.

The housing 600 is a configuration in which the inner magnetic flux unit 100, the pole piece unit 200, and the outer magnetic flux unit 300 are installed therein, and various configurations are possible.

For example, the housing 600 may include a housing body 610 having a cylindrical shape with one open end, and a cover member 620 covering the open portion of the housing body 610 .

The cover member 620 is a member that covers the open portion of the housing body 610 , and may be coupled to the housing body 610 by a bolt or the like.

Meanwhile, the housing body 610 and the cover member 620 may have various configurations depending on the support shaft.

For example, in the cover member 620, a first through hole is formed in the center so that the inner rotation shaft 150 is exposed to the outside, and the housing body 610 has an outer rotation shaft on the opposite side to the portion to which the cover member 620 is coupled. A second through hole may be formed in the center so that the 350 is exposed to the outside.

On the other hand, the magnetic gear having the above configuration is a rotating device involving rotation of one or more axes, for example, the inner rotation shaft 150 of the inner magnetic flux unit 100 and the outer rotation shaft 350 of the outer magnetic flux unit 300 . constituting the bar, there is a problem that vibration may occur due to an imbalance in weight after final assembly.

Accordingly, the magnetic gear having the above configuration is balancing through rotation in an assembly state composed of the inner magnetic flux unit 100, the pole piece unit 200 and the outer magnetic flux unit 300, that is, balancing the rotational moment of inertia. For this purpose, it can be manufactured through a balancing process in which a part of the rotational configuration is removed by a processing device such as a milling machine.

Here, the rotational configuration may be a rotating member, for example, the inner magnetic flux unit 100 and the outer magnetic flux unit 300 .

The balancing process is performed by balancing through rotation in an assembly state composed of the inner magnetic flux unit 100, the pole piece unit 200 and the outer magnetic flux unit 300, that is, a milling machine, etc. to balance the rotational moment of inertia. This is a process of removing a part of the rotating component by means of various methods.

For example, the balancing process analyzes vibration through rotation in an assembly state composed of the inner magnetic flux unit 100, the pole piece unit 200 and the outer magnetic flux unit 300, and is rotated according to the vibration analysis, This may be performed by removing a portion of at least one of the inner magnetic flux unit 100 and the outer magnetic flux unit 300 .

Specifically, in the case of the inner magnetic flux part 100, a portion of the pair of axial fixing members 190 may be removed through milling or the like according to vibration analysis.

For example, the pair of axial fixing members 190, as shown in FIG. 9, is one or more specified in the radial and circumferential directions from the inner rotation shaft 150 in order to solve the imbalance according to the vibration analysis. It is possible to reduce the vibration during rotation by changing the rotational moment of inertia by removing a part through milling at the removal position.

In the case of the external magnetic flux part 300, some of the axial fixing part 390 and the shaft coupling part 370 exposed to the outside among the pair of axial fixing members 390 are partly milled according to vibration analysis. can be removed.

For example, the axial fixing part 390 and the shaft coupling part 370 are milled at one or more removal positions specified in the radial and circumferential directions from the inner rotation shaft 150 in order to solve the imbalance according to the vibration analysis. It is possible to reduce the vibration during rotation by changing the rotational moment of inertia by removing a part through the etc.

Meanwhile, in the balancing process, it may be performed by various methods, such as being performed for both the inner magnetic flux unit 100 and the outer magnetic flux unit 300 , or at least one of them.

For example, as described above, vibration is analyzed through rotation in an assembly state composed of the inner magnetic flux unit 100, the pole piece unit 200 and the outer magnetic flux unit 300, and the inner magnetic flux unit ( 100) and a balancing process of removing a portion of both of the external magnetic flux unit 300 may be performed.

As another example, a primary balancing process of analyzing vibration through rotation in a rotating jig that rotatably supports the inner magnetic flux unit 100 and removing a part of the inner magnetic flux unit 100 according to the vibration analysis can be performed. have.

Next, after combining the pole piece unit 200 and the outer magnetic flux unit 200 with respect to the inner magnetic flux unit 100 on which the primary balancing process has been performed, the inner magnetic flux unit 100, the pole piece unit 200 and the outer magnetic flux A secondary balancing process of analyzing vibration through rotation in the assembly state composed of the part 300 and removing a part of at least one of the inner magnetic flux part 100 and the outer magnetic flux part 300 according to the vibration analysis can be done

As another example, the vibration is analyzed through rotation in a rotation jig that rotatably supports the outer magnetic flux unit 300 separately from the performance of the first balancing process described above, and part of the outer magnetic flux unit 300 according to the vibration analysis A tertiary balancing process that removes

Thereafter, the magnetic gear may be manufactured by assembling the inner magnetic flux unit 100 , the pole piece unit 200 , and the outer magnetic flux unit 300 .

Meanwhile, the magnetic gear having the above configuration may implement various rotational driving by connecting at least two of the inner magnetic flux unit 100 , the pole piece unit 200 and the outer magnetic flux unit 300 to the rotating shaft.

For example, the magnetic gear shown in FIGS. 1 to 8B may be applied to the propulsion system shown in FIGS. 10 to 12 .

Specifically, the propulsion system according to the present invention, a rotational force generating unit 2000 for generating a rotational force; The magnetic gear 1000 having the above configuration, the rotational force generating unit 2000 is connected to any one of the inner rotation shaft 150 and the outer rotation shaft 350; The first propeller 3120 that is connected to any one of the inner rotation shaft 150 and the outer rotation shaft 350 of the magnetic gear 1000 and rotates to generate thrust and the inner rotation shaft 150 and the outer rotation shaft of the magnetic gear 1000 It may include a thrust generating unit 3000 including a second propeller 3220 that is connected to the other one of the 350 and rotates to generate a thrust.

The rotational force generating unit 2000 is a configuration for generating rotational force, and various configurations are possible, such as generating rotational force by an engine such as a jet engine or an internal combustion engine, or generating rotational force by electricity such as an electric motor.

Here, the rotational force generating unit 2000 may be installed inside the body 910, which may be exposed to water in the case of an underwater body.

In addition, the body 910 may be connected by a connection part 920 for connection with a body such as a ship or an aircraft.

The magnetic gear 1000 is a magnetic gear having the configuration described above, and the rotational shaft 2100 of the rotational force generating unit 2000 is connected to any one of the inner rotational shaft 150 and the outer rotational shaft 350 to generate a rotational force generating unit ( 2000), and various configurations are possible.

In particular, in the magnetic gear 1000, both the inner rotating shaft 150 and the outer rotating shaft 350 must be located coaxially, and as shown in FIG. It may be connected to the rotating shaft 2100 and may be connected to a second propeller 3220 to be described later through the hollow structure of the outer rotating shaft 350 in the structure of FIGS. 1 to 8B .

The thrust generating unit 3000, the rotating shaft 2100 of the rotating force generating unit 2000 is connected to any one of the inner rotating shaft 150 and the outer rotating shaft 350 is rotated to generate a thrust first propeller (3120) and a second propeller 3220 connected to the other of the inner rotation shaft 150 and the outer rotation shaft 350 of the magnetic gear 1000 and rotated to generate thrust, and various configurations are possible.

The first propeller 3120 is a configuration in which the rotation shaft 2100 of the rotational force generating unit 2000 is connected to any one of the inner rotation shaft 150 and the outer rotation shaft 350 and rotates to generate thrust. possible.

As an example, the first propeller 3120 may be composed of a plurality of blades coupled along the circumferential direction to the hollow rotation shaft 3110 connected to the inner rotation shaft 150 .

And the second propeller 3220 is connected to the other one of the inner rotation shaft 150 and the outer rotation shaft 350 of the magnetic gear 1000 and rotates to generate thrust, and various configurations are possible.

For example, the second propeller 3220 includes a plurality of blades coupled along the circumferential direction to the rotation shaft 3210 connected to the outer rotation shaft 350 through the inner rotation shaft 150 and the hollow rotation shaft 3110. can be

Meanwhile, the first propeller 3120 and the second propeller 3220 are rotated in opposite directions according to the rotation structure of the magnetic gear 1000 .

At this time, by adjusting the gear ratio of the first propeller 3120 and the second propeller 3220 to change the rotation speed of the first propeller 3120 and the second propeller 3220, the propulsion efficiency can be maximized according to the propulsion environment. .

For example, when the ship propulsion system is applied, the rotation shaft 2100 of the rotational force generating unit 2000 and the rotation shaft 3210 of the second propeller 3220 are connected to the rotation shaft 2100 of the rotational force generating unit 2000 and the second propeller The rotational speed of the 3220 is the same, and the rotational shaft 3210 of the second propeller 3220 is decelerated by the magnetic gear 1000 so that the rotational speed is smaller than the rotational speed of the rotational shaft 2100 of the rotational force generating unit 2000. can be rotated.

Here, it was confirmed that the efficiency of the second propeller 3220 was greatly improved when the speed of the decelerated first propeller 3120 was set to 1.2 to 1.4 times.

The propulsion system having the above configuration may be any system that requires thrust, such as a propulsion system for an aircraft or a marine vessel, or a propulsion system for a drone.

On the other hand, the propulsion system according to the present invention includes a first propeller 3120 and a second propeller 3220 that are rotated opposite each other by a rotational force generating unit 2000 such as an electric motor, and a magnetic gear 1000. have an advantage

First, in the case of a propelling body (ship, aviation, torpedo, submersible, etc.) propelled by a single propeller rotation, the fuselage rotates together or inclines due to the torque generated by the propeller rotational motion, which affects performance such as straightness and speed. will affect

And when a single propeller is driven, the number and diameter of the blades increase according to the payload, but the frame structure is complicated, and the rotation characteristics are caused by the increase in the load and the increase in size.

As an alternative to such a single propeller, if a counter-rotating (coaxial inversion) propeller is applied, it is possible to realize in-situ flight performance, and it can be applied as a method of reducing the diameter of the propeller and increasing the thrust.

Therefore, if a propeller is applied for aviation, especially drone, it has the advantage of realizing in-situ flight performance and reducing the diameter of the propeller and increasing the thrust.

In particular, in the case of a semi-rotating propeller, compared to a single propeller, there is an effect of improving the propulsion efficiency by about 16% at low speed and about 9% at high speed.

However, in the case of a conventional coaxial inverting propeller, since an electric motor and a drive are each required, one more slave electric motor and one drive are required along with a complicated frame structure, and it is a burden on upper level control.

In contrast, the propulsion system according to the present invention is a first propeller 3120 and a second propeller ( 3220), an electric motor and a drive can inherently implement counter-rotation in one, and the structure is relatively simple, and there is an advantage in that the burden on upper-level control can be reduced.

Since the above has only been described with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as noted, should not be construed as being limited to the above embodiments, and It will be said that the technical idea and the technical idea accompanying the fundamental are all included in the scope of the present invention.

100: inner magnetic flux unit 200: pole piece unit
300: outer magnetic flux part
150: inner rotation shaft 350: outer rotation shaft

Claims (9)

An inner magnetic flux part 100 to which a plurality of permanent magnets 130 are coupled to an outer circumferential surface, and an outer magnetic flux part 300 coaxial with the inner magnetic flux part 100 to which a plurality of permanent magnets 330 are coupled to the inner circumferential surface and In the magnetic gear comprising a pole piece unit 200 positioned between the outer peripheral surface of the inner magnetic flux part 100 and the inner peripheral surface of the outer magnetic flux part 300 to adjust the magnetic flux,
At least one of the inner magnetic flux unit 100 and the outer magnetic flux unit 300,
a support body (110, 310) extending in the axial direction;
It is fixedly coupled to the support body (110, 310) and includes permanent magnet modules (120, 320) sequentially installed in the axial direction,
The permanent magnet module (120, 320), the plurality of permanent magnets (130, 330) magnetic gear, characterized in that it comprises a fixed ring (140, 340) fixedly coupled along the circumferential direction about the rotation axis. The method according to claim 1,
The permanent magnets (130, 330) fixed to the fixing rings (140, 340) are magnetic gears, characterized in that they are arranged to have a skew angle while going in the axial direction to reduce torque ripple. 3. The method according to claim 2,
The inner magnetic flux portion 100 and the outer magnetic flux portion 300, the magnetic gear, characterized in that having a skew angle (skew angle) in different directions. The method according to claim 1,
The fixing rings 140 and 340 are coupled in the axial direction with respect to the first keys 410 and 430 formed on the support bodies 110 and 310 so as to maintain a coupling angle with the support bodies 110 and 310. Magnetic gear, characterized in that the second key (420, 440) is formed. The method according to claim 1,
and a housing (600) rotatably supporting the inner rotation shaft (150) of the inner magnetic flux unit (100) and the outer rotation shaft (350) of the outer magnetic flux unit (300). 6. The method of claim 5,
The housing 600 is
a housing body 610 for rotatably supporting the outer magnetic flux unit 300;
and a cover member (620) for rotatably supporting the inner magnetic flux part (100). a rotational force generating unit 2000 for generating a rotational force;
The magnetic gear according to any one of claims 1 to 6, wherein the rotational force generating unit 2000 is connected to any one of the inner rotating shaft 150 and the outer rotating shaft 350;
A first propeller 3120 that is connected to any one of the inner rotation shaft 150 and the outer rotation shaft 350 of the magnetic gear 1000 and rotates to generate thrust and the inner rotation shaft of the magnetic gear 1000 ( 150) and a thrust generating unit 3000 including a second propeller 3220 that is connected to the other one of the outer rotation shaft 350 and rotates to generate thrust. 8. The method of claim 7,
A propulsion system, characterized in that it is a propulsion system of an aircraft or marine vessel. 8. The method of claim 7,
A propulsion system, characterized in that it is a propulsion system of a drone.

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