WO2016036107A1

WO2016036107A1 - Magnetic gear having magnetic flux concentration type pole pieces, and magnetic gear provided with pole pieces at outside of rotors

Info

Publication number: WO2016036107A1
Application number: PCT/KR2015/009187
Authority: WO
Inventors: 김용재; 김성진; 김찬호; 박의종
Original assignee: 조선대학교산학협력단
Priority date: 2014-09-03
Filing date: 2015-09-01
Publication date: 2016-03-10
Also published as: JP6202354B2; JP2017205008A; JP2016533706A

Abstract

The present invention relates to a magnetic gear and, more specifically, to: a magnetic gear having magnetic flux concentration type pole pieces, capable of improving transfer torque and reducing torque ripple by improving the shape of the pole pieces located between rotors so as to concentrate magnetic flux on pores; and a magnetic gear comprising pole pieces at the outside of rotors distanced from each other and located on a rotating shaft, thereby enabling the simplification of the structure thereof by reducing the number of pores and enabling the minimization of a decrease in torque transmissibility caused by friction by reducing the number of bearings supporting the rotating shaft.

Description

Magnetic gear with magnetic flux concentrated pole pieces and magnetic gears provided on the outside of the rotors

The present invention relates to a magnetic gear, and more particularly, to concentrate the magnetic flux in the air gap by improving the shape of the pole pieces located between the rotors to improve the transmission torque and to reduce the torque ripple By having a magnetic gear having a piece and a pole piece on the outside of the rotors spaced apart on the axis of rotation, the structure can be simplified by reducing the number of air gaps, and the number of bearings supporting the axis of rotation can be reduced to reduce the torque transmission rate due to friction. It relates to a magnetic gear that can minimize the reduction.

Magnetic gear is a non-contact gear device that transmits power in a non-contact manner by using magnetic force. It is less noise and vibration than a gear that transmits power by physical contact, and it does not need lubricant injection or maintenance inspection, and it is stable without mechanical friction. The recent research is active due to its high durability and durability.

In addition, the magnetic gear can reduce energy loss, enabling high efficiency driving and delivering reliable and accurate peak torque.

In recent years, there have been efforts to apply magnetic gears across various industries such as wind turbines, electric vehicles, and transmissions.

FIG. 1 shows a typical magnetic gear, and FIG. 2 shows a vertical cross section of a typical magnetic gear.

Referring to FIGS. 1 and 2, the conventional magnetic gear 10 has a

large rotor

11, 12 between the inner rotor 11, the outer rotor 12, the inner rotor 11, and the outer rotor 12. It is configured to include a pole piece module 13 and spaced apart from.

In addition, the inner rotor 11 includes an inner rotor 11b and a magnet 11a radially attached to the outside of the inner rotor 11b about a rotation axis, and the outer rotor 12 includes an outer rotor. 12a and a magnet 12b radially attached about an axis of rotation within the outer rotor 12a, wherein the pole piece module 13 includes a plurality of pole pieces radially equidistantly spaced about the axis of rotation. 13a).

In addition, the magnets of the inner rotor 11 and the outer rotor 12 are magnets having magnetic force in opposite directions (direction toward the axis of rotation and opposite to the direction of rotation axis) are alternately positioned, and opposite to each other. Two magnets with a magnetic force in the direction are bipolar.

In addition, when the pole piece module 13 is fixed, the inner rotor 11 and the outer rotor 12 are rotated in opposite directions, and depending on which rotor becomes the input shaft, Is used.

In addition, the outer rotor 12 rotates at a low speed, the inner rotor 11 rotates at a high speed, and the dipole number of the outer rotor 12 and the dipole number of the inner rotor 11 are represented by the following equation. The number of pole pieces 13a is determined as shown in a.

Equation a

Here, N _s denotes the number of pole pieces 13a, p ₁ denotes the number of dipoles of the outer rotor 12, and p ₂ denotes the number of dipoles of the inner rotor 11.

2, the pole pieces 13a are formed because the number of poles of the magnet of the outer rotor 12 is 42 poles and the number of poles is 21 poles. The number of s is 23 plus the number of bipolar 21 poles and two poles of each rotor.

In addition, the gear ratio of the magnetic gear 10 is determined by the ratio of the number of dipoles of the rotor as shown in equation (b) below.

[Equation b]

In addition, the speed ratio of the rotors of the magnetic gear 10 is as shown in Equation c below.

[Equation c]

In addition, the pole piece 13a of the conventional magnetic gear 1 has an outer arc 13aa, an inner arc 13ab, and an outer arc 13aa and an inner arc 13ab whose vertical cross sections have the same center angle and different diameters. It has a form of a figure surrounded by a straight line (13ac) for connecting each one end of) and a straight line (13ad) for connecting each other end.

However, in the conventional magnetic gear 10, due to the morphological limitation of these pole pieces 13a, between the outer rotor 12 and the pole piece module 13, and between the inner rotor 11 and the pole piece module 13, There is a problem in that the torque transmission is low and the torque ripple is large because the magnetic flux cannot be concentrated in the air gap.

In addition, FIG. 3 shows a vertical section in the rotational axis direction of the conventional magnetic gear 10. The conventional magnetic gear 10 may include, in addition to the inner rotor 11, the outer rotor 12, and the pole piece module 13. The housing 14, the pole piece module support member 15, the inner rotor support member 16 and the outer rotor support member 17 is configured to further comprise.

In addition, the housing 14 defines an external shape, and the pole piece module support member 15 supports the pole piece module 13 to be spaced apart from the housing 14 inside the housing 14. .

In addition, the inner rotor support member 16 supports the inner rotor 11 spaced apart from the pole piece module support member 15 on the inner side of the pole piece module support member 15 and of the housing 14. It has an input shaft 11c exposed to one side.

In addition, the outer rotor support member 17 separates the outer rotor 12 from the housing 14 and the pole piece module 13, respectively, between the housing 14 and the pole piece module 13. It supports and has an output shaft 12c exposed to the other side of the housing (14).

In addition,

bearings

14a, 15a, 16a, 16b are provided between the fixed member and the rotating member. In detail, the

bearings

14a, 15a, 16a, and 16b may be radial bearings that support a load acting perpendicular to the axis of rotation of the rotating member.

In addition, the

bearings

14a, 15a, 16a, and 16b may include a first outer rotor support bearing 14a for supporting the output shaft 12c on the housing 14 and the pole piece module support member 15. A second outer rotor support bearing 15a for supporting the outer rotor support member 17, a first inner rotor support bearing 16a for supporting the input shaft 11c on the pole piece module support member 15, and the outer side The rotor support member 17 includes a second inner rotor support bearing 16b for supporting the inner rotor 11.

That is, since the conventional magnetic gear 10 includes four

bearings

14a, 15a, 16a, and 16b, the torque transmission rate due to friction of the bearings is lowered.

In addition, in order for the

rotors

11 and 12 to rotate inside the housing 14, a first gap a1, the outer rotor 12, and the pole piece module are disposed between the housing 14 and the inner rotor. Since the third void a3 must exist between the second void a2, the pole piece module 13, and the inner rotor 11, the structure becomes very complicated.

[Preceding technical literature]

[Patent Documents]

1. Korean Patent Publication No. 10-2013-0042564, magnetic gear device and holding member

2. Korean Patent Publication No. 10-2014-0013087, magnetic gear device

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By optimizing the shape of the pole piece to concentrate the magnetic flux in the air gap, the torque transmission and the torque ripple can be lowered, thereby improving the power transmission rate and reliability. It is to provide a magnetic gear having.

It is also an object of the present invention to provide a magnetic gear having a simple structure because the number of voids can be reduced.

In addition, an object of the present invention is to provide a magnetic gear that can reduce the number of bearings to minimize the reduction of torque transmission rate due to friction of the bearings.

In addition, an object of the present invention is to provide a magnetic gear that can improve the torque transmission by optimizing the shape of the pole piece to concentrate the magnetic flux in the air gap and to improve the power transmission rate and reliability by lowering the torque ripple.

In addition, according to the magnetic gear of the present invention, since the pole piece module also serves as a housing, the rotor can be rotated by only one void in the pole piece module, and thus the structure is very simple.

In addition, according to the magnetic gear of the present invention, since only three bearings can rotate the rotors in a non-contact manner, there is an advantage of minimizing the reduction in torque transmission due to friction of the bearings.

In addition, according to the multiple type magnetic gear of the present invention, the two magnetic gears are directly connected to each other to provide a large torque ratio even with a small volume.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides an inner rotor, an outer rotor provided to be spaced apart from the inner rotor, and positioned between the inner rotor and the outer rotor and from the inner rotor to the outer rotor or A magnetic gear comprising a pole piece module having a plurality of pole pieces spaced apart from each other to transfer magnetic flux from the outer rotor to the inner rotor, wherein the cross section of each pole piece is a first arc. A first figure surrounded by a line connecting the first and second ends of the first arc and the second arc and the second arc smaller than the inner diameter of the first arc and the inner diameter of the first arc and the center are the same; And, the second arc and the position and the inner diameter of the center is the same and the center angle is greater than the third angle of the second arc, the third arc and the position and center angle of the center is the same and the inner diameter is A fourth figure smaller than the inner diameter of the third arc and the second figure surrounded by a line connecting each end and the other end of the third arc and the fourth arc has a combined shape, the second position of the second arc and the third The bisected position of the arc provides a magnetic gear characterized in that it has a shape coupled to overlap each other.

In a preferred embodiment, the vertical distance (hereinafter referred to as 'first vertical distance') of the fourth arc and the third arc is the vertical distance of the fourth arc and the first arc (hereinafter referred to as 'first vertical distance') The second vertical distance) is greater than 13.5% and less than 23.5%.

[Equation 1]

Where α is the first vertical distance and L _pr is the second vertical distance.

In a preferred embodiment, the center angle of the fourth arc is the center angle of the virtual arc connecting the first arcs of two pole pieces with one pole piece interposed therebetween, as shown in Equation 2 below (hereinafter referred to as 'reference angle'). Greater than 40% and less than 50%).

[Equation 2]

Where β is the center angle of the fourth arc and N _p is the number of pole pieces.

In a preferred embodiment, the line connecting the first arc and the second arc in the first figure is a concave curve toward the center of the first figure (hereinafter referred to as 'concave curve').

In a preferred embodiment, the length from the bisected position of the imaginary line connecting the both ends of the concave curve (hereinafter referred to as 'first virtual line segment') to the concave curve in the vertical direction (hereinafter referred to as 'concave length') The first segment in the vertical direction at a bisecting position of a virtual line segment (hereinafter referred to as a 'second virtual line segment') connected in a vertical direction to the fourth arc at one end of the first arc side of the concave curve. It is greater than 30% and less than 40% of the length of the virtual line segment (hereinafter referred to as 'third virtual line segment') connecting the bisected position of the arc and the bisected position of the fourth arc.

In a preferred embodiment, the concave length is calculated by Equation 3 below.

[Equation 3]

Here, D _pi is the inner diameter of the fourth arc, D _po is the inner diameter of the first arc, N _p is the number of pole pieces.

In addition, the present invention includes at least two of the magnetic gears, wherein, among the magnetic gears, the output rotor of the first magnetic gear is further provided with a multiple type magnetic gear, characterized in that directly connected to the input rotor of the second magnetic gear. do.

In addition, the present invention is the magnetic gear; At least one inner pole piece module spaced apart from an inner rotor of the magnetic gear and having a plurality of pole pieces; And at least one intermediate rotor provided between the inner pole piece module and the pole piece module of the magnetic gear.

The present invention also provides an input rotor; An output side rotor spaced apart from the input side rotor on a rotation axis extension of the input side rotor; And a pole piece module surrounding the input side rotor and the output side rotor outside the input side rotor and the output side rotor and having a plurality of pole pieces radially positioned on a rotation axis, and transmitting magnetic force of the input side rotor to the output side rotor. And the input side rotor and the output side rotor are located together inside the pole piece module, and further provided with a magnetic gear, wherein the pole piece module is spaced apart from each other.

In a preferred embodiment, the pole piece module includes a pole piece module support member for supporting the pole pieces so as to remain radial to the axis of rotation, the outer ring is fixed inside one side of the pole piece module support member, the inner ring is An input shaft support bearing fixed to an input shaft of the input side rotor and configured to rotate the input side rotor while being spaced apart from the pole piece module; An outer ring is fixed to the inside of the other side of the pole piece module support member, the inner ring is fixed to the output shaft of the output side rotor, and an output shaft support bearing for allowing the output side rotor to rotate while being spaced apart from the pole piece module; And a rotor coupling bearing configured to allow the output shaft of the input rotor and the input shaft of the output rotor to rotate while being mutually supported such that the output shaft of the input rotor and the input shaft of the output rotor are supported on the rotation shaft.

The present invention has the following excellent effects.

According to the magnetic gear of the present invention, the magnetic flux can be concentrated in the void by limiting the variables α, β, and γ regarding the cross-sectional shape of the pole piece, thereby improving torque transmission and lowering torque ripple, thereby improving power transmission rate and reliability. It has an effect.

In addition, according to the multilayer type magnetic gear of the present invention, there is an effect that a large torque ratio can be provided using a small number of magnets by inserting an intermediate rotor between the outer rotor and the inner rotor.

1 is a view showing a general magnetic gear,

2 is a view showing a vertical cross section of a typical magnetic gear,

3 is a view showing a vertical direction in the axis of rotation of a general magnetic gear,

4 is a view for explaining a magnetic gear according to a first embodiment of the present invention,

5 is a view for explaining the pole piece shape of the magnetic gear according to the first embodiment of the present invention,

6 to 8 are views for explaining a parameter for determining the shape of the pole piece of the magnetic gear according to the first embodiment of the present invention,

9 is a view showing a magnetic flux diagram of a conventional magnetic gear and the magnetic gear according to the first embodiment of the present invention;

10 is a graph for comparing the magnetic flux density of the inner gap of the conventional magnetic gear and the magnetic gear according to the first embodiment of the present invention,

11 is a graph for comparing the magnetic flux density of the outer gap of the conventional magnetic gear and the magnetic gear according to the first embodiment of the present invention,

12 is a graph for comparing the torque of the conventional magnetic gear and the inner rotor of the magnetic gear according to the first embodiment of the present invention,

13 is a graph for comparing the torque of the conventional magnetic gear and the outer rotor of the magnetic gear according to the first embodiment of the present invention,

14 is a graph for comparing the torque of the inner rotor in the normal state of the conventional magnetic gear and the magnetic gear according to the first embodiment of the present invention,

15 is a graph for comparing the torque of the outer rotor in the normal state of the conventional magnetic gear and the magnetic gear according to the first embodiment of the present invention,

16 is a view for explaining a multiple type magnetic gear according to a second embodiment of the present invention;

17 is a view for explaining the multilayer type magnetic gear according to the third embodiment of the present invention;

18 is a view showing a cross section of a multilayer type magnetic gear according to the third embodiment of the present invention.

19 is a view showing a magnetic gear according to a fourth embodiment of the present invention;

20 is a view showing a vertical cross section of the magnetic gear according to the fourth embodiment of the present invention,

21 is a view showing a vertical axis in the rotation axis direction of the magnetic gear according to the fourth embodiment of the present invention,

22 is a view showing an example of a pole piece of the magnetic gear according to the fourth embodiment of the present invention,

FIG. 23 is a diagram illustrating a multiple type magnetic gear according to a fifth exemplary embodiment of the present invention.

[First Embodiment]

The terms used in the present invention were selected as general terms as widely used as possible, but in some cases, the terms arbitrarily selected by the applicant are included. In this case, the meanings described or used in the detailed description of the present invention are considered, rather than simply the names of the terms. The meaning should be grasped.

Hereinafter, with reference to the preferred embodiments shown in the accompanying drawings will be described in detail the technical configuration of the present invention.

However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

Referring to FIG. 4, the magnetic gear 100 according to the first embodiment of the present invention may include an outer rotor 110 and an inner rotor spaced apart from the outer rotor 110 inside the outer rotor 110. 120 and the pole piece module 130 spaced apart from the outer rotor 110 and the inner rotor 120, respectively, between the outer rotor 110 and the inner rotor 120.

In addition, when the pole piece module 130 is fixed, the outer rotor 110 and the inner rotor 120 rotates in different directions and from the outer rotor 110 to the inner rotor 120 or The rotational force is transmitted from the inner rotor 120 to the outer rotor 110.

However, when any one of the outer rotor 110 and the inner rotor 120 is fixed, the other one rotor that is not fixed to the pole piece module 130 may rotate and transmit power.

In this case, the rotation direction of the pole piece module 130 and the rotating rotor is the same.

In addition, in Figure 4, the magnetic gear 100 according to the first embodiment of the present invention is shown as a magnetic gear of the cylindrical rotation type, but can be manufactured in a disk rotation type, flat plate linear type, cylindrical linear type. For example, the form of the disk rotation type, flat plate linear type, and cylindrical linear type of patent document 1 can be referred.)

In addition, the outer rotor 110 includes an outer rotor 111 and a plurality of magnets 112 that are attached to each other inside the outer rotor 111 in a bipolar manner, and the inner rotor 120 has an inner rotor. And a plurality of magnets 122 attached to the inner rotor 121 to form an outer pole.

In addition, the pole piece module 130 includes a plurality of pole pieces 131 spaced apart from each other radially with respect to the rotation axis (c).

In addition, the pole piece 131 is also called a magnetic pole piece, and serves to transfer the magnetic flux from the outer rotor 110 to the inner rotor 120 or from the inner rotor 120 to the outer rotor 110 as a magnetic material. Do it.

In addition, the pole pieces 131 are fixed by a support member for keeping the pole pieces 131 and the pole pieces 131 and the magnets of the

rotors

110 and 120 spaced apart from each other.

In addition, the number of the pole pieces 131 is determined by Equation a described above, and the gear ratio is the same as Equation b described above.

In addition, an outer air gap (a1) exists between the pole pieces 131 and the magnet 112 of the outer rotor 110, and the magnets of the pole pieces 131 and the inner rotor 120 ( 122, there is an inner airgap (a2).

In addition, the pores a1 and a2 act as resistances in the magnetic circuit, so that the magnetic flux is concentrated.

Hereinafter, the shape of the pole piece 131 will be described in detail with reference to FIG. 5.

Referring to FIG. 5, the pole piece 131 of the magnetic gear 100 according to the first embodiment of the present invention has a bar shape parallel to the rotation axis c, and has a vertical cross section of the first figure 131a and the second figure. 131b has a shape in which it is bonded on a plane.

In addition, the first figure 131a has a curved first arc arc 131aa, the position and center angle θ1 of the first arc 131aa and the center c are the same, and the inner diameter d2 is the same. The second arc 131ab smaller than the inner diameter d1 of the first arc 131aa, the line 131ac and the first arc connecting each end of the first arc 131aa and the second arc 131ab. 131aa is a plane figure surrounded by a line 131ad connecting the other ends of the second arc 131ab.

In other words, the inner radius d2 / 2 of the second arc 131ab is smaller than the inner radius d1 / 2 of the first arc 131aa, the curvatures are the same, and the position of the center c is Coincides with the position of the rotation axis (c).

In addition, the lines 131ac and 131ad connecting the first arc 131aa and the second arc 131ab are concave curves (hereinafter referred to as 'concave curves') toward the center of the first figure 131a. It is preferable.

In addition, the second figure 131b has the same position and inner diameter d2 as the second arc 131ab and the center c, and the center angle θ2 is the center angle θ1 of the second arc 131ab. The larger the third arc 131ba, the position of the third arc 131ba and the center c, and the magnitude of the center angle θ2 are the same, and the inner diameter d3 is the inner diameter d2 of the third arc 131ba. 4th 131bb smaller than), a line 131bd connecting each end of the third arc 131ba and the fourth arc 131bb, and the third arc 131ba and the fourth arc 131bb. It is a planar figure surrounded by a line (131bc) connecting the other ends of the ().

In other words, the inner diameter radius d2 / 2 of the second arc 131ab and the third arc 131ba is the same, and the inner diameter radius d2 / 2 of the third arc 131ba is the fourth. It is larger than the inner diameter radius d3 / 2 of the arc 131bb.

In addition, the lines 131bc and 131bd connecting the ends of the third arc 131ba and the fourth arc 131bb may be straight lines.

In addition, in the first figure 131a and the second figure 131b, a bisected position c1 of the second arc 131ab and a bisected position c1 of the third arc 131ba overlap each other. To form a cross-sectional shape of the pole piece 131 by combining on a plane.

6 to 8 illustrate variables for determining the shape of the pole piece of the magnetic gear according to the first embodiment of the present invention. There are three variables for determining the shape of the pole piece 131.

First, referring to FIG. 6, a first variable is a distance (α, hereinafter referred to as 'first vertical distance') perpendicular to the third arc 131ba and the fourth arc 131bb.

In addition, the first vertical distance α is 13.5 in the distance L _pr '(hereinafter referred to as' the second vertical distance') perpendicular to the fourth arc 131bb and the first arc 131aa, respectively. Larger than% and smaller than 23.5%.

That is, the first vertical distance α is designed to satisfy Equation 1 below.

Equation 1

Next, referring to FIG. 7, the second variable is the center angle β of the fourth arc 131bb.

In addition, the center angle β of the fourth arc 131bb is the first arcs 131'aa, 131 "aa of two pole pieces 131 ', 131" sandwiching one pole piece 131 therebetween. Is greater than 40% and less than 50% of the center angle of the virtual arc (β ', hereinafter referred to as' reference angle') connecting the opposite ends of

That is, the center angle β of the fourth arc 131bb is designed at an angle in the range of 40% to 50% of the reference angle β 'as shown in Equation 2 below.

Equation 2

Where N _p is the number of pole pieces.

Next, referring to FIG. 8, the third variable is a vertical direction at a second bipartite position c2 of an imaginary line segment ℓ1 (hereinafter referred to as a “first imaginary line segment”) connecting both ends of any one concave curve 131ac. This is the length (γ, hereinafter referred to as 'concave length') to any one concave curve (131ac).

In addition, the concave length γ is an imaginary line segment L2 connected perpendicularly to the fourth arc 131bb at one end 131ac 'of the first arc 131aa side of the concave curve 131ac. The second bisected position c4 of the first arc 131aa and the second bisected position c5 of the fourth arc 131bb in the vertical direction at the second dividing position c3 of the second virtual line segment hereinafter. It is larger than 30% and smaller than 40% in the length (γ ', hereinafter' reference length ') to the virtual line segment (ℓ3, hereinafter referred to as' the third virtual line segment)'.

That is, the concave length γ is designed within the range of 30% to 40% of the reference length γ 'as shown in Equation 3 below.

Equation 3

Here, D _pi is the inner diameter d3 of the fourth arc 131bb, D _po is the inner diameter d1 of the first arc 131aa, and N _p is the number of the pole pieces 131.

In Equation 3, the denominator means the reference length γ 'and is a straight line passing through the points c5 and c4 with the first virtual line segment L3 as the x-axis on a rectangular coordinate system centered on the origin c. Equation for calculating the y-axis coordinate value of the intersection point of the straight line passing through the points c3 and c6. However, the reference length γ 'can be calculated in various ways.

9 shows a magnetic flux diagram of a conventional magnetic gear and a magnetic gear according to a first embodiment of the present invention, where 10_flux is a magnetic flux diagram of a conventional magnetic gear 10 and 100_flux is a magnetic flux of a magnetic gear 100 of the present invention. It shows the lead.

In addition, the magnetic gear 100 of the present invention was designed by determining the variable α as 6mm, β as 0.5deg, and γ as 1.43mm.

9, it can be seen that the magnetic flux diagram 100_flux of the magnetic gear 100 of the present invention has a higher density than the magnetic flux diagram 10_flux of the conventional magnetic gear 10.

FIG. 10 is a graph for comparing magnetic flux densities of the conventional magnetic gear 10 and the inner gap a2 of the magnetic gear 100 according to the first embodiment of the present invention, and the inner gap of the conventional magnetic gear 10. It was confirmed that the maximum magnetic flux density (Conventional Model Inner Airgap) is 1.6T but the internal air gap magnetic flux density (Optimal Model Inner Airgap) of the magnetic gear 100 of the present invention is increased to 0.16T to 1.78T.

11 is a graph for comparing the magnetic flux density of the outer air gap of the conventional magnetic gear 10 and the magnetic gear 100 according to the first embodiment of the present invention, the outer air gap magnetic flux density of the conventional magnetic gear 10 ( Conventional Model Outer Airgap) has a maximum value of 0.79T, but it has been confirmed that the maximum airflow magnetic flux density (Optimal Model Outer Airgap) of the magnetic gear 100 of the present invention has risen 0.04T to a maximum value of 0.83T.

12 is a graph (torque-angle curve) for comparing the torque of the conventional magnetic gear 10 and the inner rotor of the magnetic gear 100 according to the first embodiment of the present invention, the magnetic gear 100 of the present invention It can be seen that the maximum value of the inner rotor torque (Inner Torque_Optimal Model) of 18) is 18.97 Nm, which is 0.5 Nm higher than the maximum value of the inner rotor torque (Inner Torque_Basic Model) of the conventional magnetic gear 10 (18.47 Nm).

13 is a graph for comparing the torque of the conventional magnetic gear 10 and the outer rotor of the magnetic gear 100 according to the first embodiment of the present invention, the magnetic gear 100 according to an embodiment of the present invention It can be seen that the maximum value of the outer rotor torque (Outer Torque_Optimal Model) of 196.81 Nm is 5.82 Nm increased from the maximum value of the outer rotor torque (Outer Torque_Basic Model) of the conventional magnetic gear 10 190.99 Nm.

14 is a graph for comparing the torque of the inner rotor in the steady state of the conventional magnetic gear 10 and the magnetic gear 100 according to the first embodiment of the present invention in the steady state, the magnetic gear 100 of the present invention The torque waveform of) is 18.6939Nm and it can be seen that the torque waveform of the conventional magnetic gear 10 is increased from 18.16Nm, and in the case of torque ripple, the torque ripple is reduced from 3.75% to 0.90%.

15 is a graph for comparing the torque of the conventional magnetic gear 10 and the outer rotor of the magnetic gear 100 according to the first embodiment of the present invention in a steady state, and the torque of the magnetic gear 100 of the present invention. The waveform is 196.07Nm, which is higher than the torque waveform 190.52Nm of the conventional magnetic gear 10.In the case of torque ripple, the overall torque ripple including the torque ripple of the inner rotor was increased slightly from 0.06% to 0.11%. It can be seen that is reduced.

It can be seen that the ripple rate is very small considering that the ripple rate of commercially available motors is 5% or less.

Second Embodiment

FIG. 16 is a diagram illustrating a multiple type magnetic gear according to a second exemplary embodiment of the present invention.

Referring to FIG. 16, the multiple type magnetic gear 200 according to the second embodiment of the present invention has a form in which a plurality of magnetic gears 100 according to the first embodiment of the present invention are directly connected.

In addition, although FIG. 16 illustrates a dual type magnetic gear in which two magnetic gears 100 and 100 'are directly connected, three or more magnetic gears may be directly connected to each other.

In addition, in the dual type, the output side 110a of the first magnetic gear 100 is connected to the input side 130'a of the second magnetic gear 110 '.

In addition, in the case where power is transmitted from the first magnetic gear 100 to the second magnetic gear 100 ', it is a reducer, and from the second magnetic gear 100' to the first magnetic gear 100. It acts as an accelerator when power is transmitted.

In addition, the gear ratio of the inner rotor 130 and the outer rotor 110 of the first magnetic gear 100 is 1:10, the inner rotor 130 'and the outer rotor of the second magnetic gear 100' ( 110 '), the gear ratio is 1:10, the total gear ratio is 1: 100 and the torque ratio is 1: 100.

That is, when the conventional magnetic gear 10 is to be designed to have a torque ratio of 1: 100, since the number of dipoles of the outer rotor has to be 100 times larger than the number of dipoles of the inner rotor, it is inevitable to enlarge, but the multiple type magnetic gear of the present invention. The 200 has the advantage of realizing a small and high torque ratio by using two magnetic gears.

Third Embodiment

FIG. 17 is a view for explaining a multilayer type magnetic gear according to the third embodiment of the present invention, and FIG. 18 is a view showing a cross section of the multilayer type magnetic gear according to the third embodiment of the present invention.

17 and 18, the multiple type magnetic gear 300 according to the third embodiment of the present invention is the inner pole piece module 310 and the middle of the magnetic gear 100 according to the first embodiment of the present invention. It is configured to include a rotor (320).

In addition, the number of the inner pole piece module 310 and the intermediate rotor 320 is not limited, the designer can be configured in any number according to the desired gear ratio. However, the number of the inner pole piece module 310 and the intermediate rotor 320 should be equal to each other in a pair.

In addition, the inner pole piece module 310 is spaced apart from the outside of the inner rotor 120 of the magnetic gear 100, and has a plurality of inner pole pieces 311.

In addition, the shape of the inner pole piece 311 may also be designed by limiting the variables α, β, γ in the same way as the cross section of the pole piece 131.

In addition, the intermediate rotor 320 is provided to be spaced apart from the inner pole piece module 310 and the pole piece module 130, respectively, between the inner pole piece module 310 and the pole piece module 130.

That is, in the multiple type magnetic gear 200 according to the third embodiment of the present invention, when the inner rotor 120 rotates, the inner pole piece module 311 transmits the magnetic flux to the intermediate rotor 320, The duration of the intermediate rotor 320 is transmitted to the outer rotor 110 by the pole piece module 130 to rotate.

In addition, when the driving force is transmitted from the inner rotor 120 toward the outer rotor 110, the accelerator, and when the driving force is transmitted from the outer rotor 110 toward the inner rotor 120, it operates as a reducer.

Therefore, according to the multiple type magnetic gear 200 according to the third embodiment of the present invention, the gear ratio that the conventional magnetic gear 10 is to implement is the outer rotor 110, the intermediate rotor 320, and the inner rotor 120. Since it is shared, there is an advantage that can realize the desired gear ratio while reducing the number of poles of the magnet than the conventional magnetic gear 10.

[Example 4]

19 and 20, the magnetic gear 100 according to the fourth embodiment of the present invention has an input rotor 110 and an input rotor 110 on an extension line of the rotation axis c of the input rotor 110. And an output side rotor 120 spaced apart from the input side rotor 110 and the pole piece module 130 surrounding the outside of the output side rotor 120.

In addition, the input side rotor 110 includes an input side rotor 111 and a magnet 112 radially attached to an outer side of the input side rotor 111 about a rotation shaft c.

In addition, the output side rotor 120 includes an output side rotor 121 and a magnet 122 radially attached to the outer side of the output side rotor 121 about the rotation axis (c).

In addition, the gear ratio of the magnetic gear 100 is determined by the ratio of the number of dipoles of the input rotor 110 and the output rotor 120 as shown in equation (b).

In addition, the pole piece module 130 surrounds the input side rotor 110 and the output side rotor 120 together with the outer side of the input side rotor 110 and the output side rotor 120, and radially with respect to the rotation axis c. It includes a plurality of pole pieces 131 positioned to.

That is, the input rotor 110 and the output rotor 120 are located together inside the pole piece module 130.

In addition, the pole piece module 130 is spaced apart from the input side rotor 110 and the output side rotor 120, respectively.

In addition, the pole piece module 130 serves to transmit the magnetic force generated by the rotation of the input side rotor 110 to the output side rotor 120 to rotate the output side rotor 120.

In addition, the number of pole pieces 131 satisfies Equation a.

19 and 20, the magnetic gear 100 according to the fourth embodiment of the present invention is shown as a magnetic gear of cylindrical rotation type, but can be manufactured in a disk rotation type, a flat plate linear type, and a cylindrical linear type. (For example, the form of the disk rotation type, flat plate linear type, and cylindrical linear type of patent document 1 can be referred.)

In addition, referring to FIG. 21, the magnetic gear 100 according to the fourth embodiment of the present invention includes a pole piece module support member 132 and the rotors for maintaining the pole pieces 131 in a radial form. It further comprises a plurality of bearings (140, 150, 160) for supporting the rotating shafts (110, 120).

In addition, the pole piece module support member 132 serves to support the pole pieces 131 in a radial position, and together with the pole pieces 131 constitute the pole piece module 130.

That is, the pole piece module 130 may serve as a housing outside the

rotors

110 and 120.

In addition, the bearings (140, 150, 160) the outer ring is fixed to the inside of one side of the pole piece module support member 132, the inner ring is an input shaft support bearing 140 is fixed to the input shaft 113 of the input rotor (110), The outer ring is fixed to the inside of the other side of the pole piece module support member 132, the inner ring is fixed to the output shaft 123 of the output side rotor 120, the output side rotor 120 in the pole piece module 130 The output shaft support bearing 150 and the output shaft 114 of the input side rotor 110 and the input shaft 124 of the output side rotor 120 are connected to be supported on the rotation shaft c so as to be spaced apart, and the input side rotor The output shaft 114 of the 110 and the input shaft 124 of the output side rotor 120 includes a rotor connection bearing 160 to rotate while sliding with each other.

In addition, the output shaft support bearing 150 and the input shaft support bearing 140 are each provided as a radial bearing that receives a load acting perpendicular to the rotation axis (c), the rotor connection bearing 160 is It is provided with a thrust bearing (thrust bearing) receiving a thrust parallel to the rotation axis (c).

That is, the magnetic gear 100 according to the fourth embodiment of the present invention has the advantage of reducing the reduction in torque transmission rate due to friction of the bearing since only three bearings are required as compared to the conventional magnetic gear 10. .

In addition, the magnetic gear 100 according to the fourth embodiment of the present invention requires only one air gap a4 between the

rotors

110 and 120 and the pole piece module 130 as compared to the conventional magnetic gear 10. Therefore, the configuration is very simple, it is easy to manufacture, reduce the production cost, and has the advantage of easy control of the size of the air gap.

22 shows an example of a cross section of the pole piece 130 of the magnetic gear 100 according to the fourth embodiment of the present invention, as compared with the pole piece 13a of the conventional magnetic gear 10 to concentrate the magnetic flux in the air gap. It is produced in a form that can be.

In addition, the pole piece 130 of the magnetic gear 100 according to the fourth embodiment of the present invention is substantially the shape of the pole piece 130 according to the first embodiment of the present invention shown in Figs. It may have the same shape.

[Example 5]

FIG. 23 is a diagram for describing a multiple type magnetic gear according to a fifth exemplary embodiment of the present invention.

Referring to FIG. 23, the multiple type magnetic gear 200 according to the fifth embodiment of the present invention has a form in which a plurality of magnetic gears 100 according to the fourth embodiment of the present invention are directly connected to each other.

In addition, although FIG. 23 illustrates a dual type magnetic gear in which two magnetic gears 100 and 100 'are directly connected, three or more magnetic gears may be directly connected to each other.

In addition, in the dual type, the output shaft 123 of the first magnetic gear 100 is connected to the input shaft 113 'of the second magnetic gear 110'.

In addition, the gear ratio of the input rotor 110 and the output rotor 120 of the first magnetic gear 100 is 1:10, the input rotor 110 'and the output rotor of the second magnetic gear 100' ( When the gear ratio of 120 ') is 1:10, the total gear ratio is 1: 100 and the torque ratio is 1: 100.

As described above, the present invention has been illustrated and described with reference to preferred embodiments, but is not limited to the above-described embodiments, and is provided to those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

The present invention is applicable to a variety of fields that require a non-contact rotary power, such as a magnetic gear vehicle, machine tools, factory equipment.

Claims

An inner rotor, an outer rotor provided spaced apart from the inner rotor, and located between the inner rotor and the outer rotor, the magnetic flux from the inner rotor to the outer rotor or from the outer rotor to the inner rotor A magnetic gear comprising a pole piece module having a plurality of pole pieces spaced apart from each other for transmitting a

The cross section of each pole piece,

The first arc (arc), the position and center angle of the center of the first arc is the same and the inner diameter is smaller than the inner diameter of the first arc, and each one end and each other end of the first arc and the second arc The first figure surrounded by a line,

The third arc having the same position and inner diameter as the second arc and the center angle is larger than the center angle of the second arc; and the fourth having the same position and center angle as the third arc and the inner diameter is smaller than the inner diameter of the third arc. Arc and a second figure surrounded by a line connecting each end and the other end of the third arc and the fourth arc,

The second bisected position of the second arc and the second bisected position of the third arc have a shape coupled to overlap each other.
The method of claim 1,

The vertical distance between the fourth arc and the third arc (hereinafter, referred to as 'first vertical distance') is a vertical distance between the fourth arc and the first arc (hereinafter referred to as 'second vertical distance') as shown in Equation 1 below. Magnetic gear, characterized by greater than 13.5% and less than 23.5%.

[Equation 1]

Where α is the first vertical distance and L pr is the second vertical distance.
The method of claim 1,

The center angle of the fourth arc is greater than 40% of the center angle of the virtual arc (hereinafter, referred to as a reference angle) connecting the first arcs of two pole pieces with one pole piece interposed therebetween, as shown in Equation 2 below. Magnetic gear characterized by less than 50%.

[Equation 2]

Where β is the center angle of the fourth arc and N p is the number of pole pieces.
The method of claim 1,

Magnetic lines, characterized in that the line connecting the first arc and the second arc in the first figure is a concave curve (hereinafter referred to as 'concave curve') toward the center of the first figure.
The method of claim 4, wherein

The length (hereinafter referred to as 'concave length') from the bisected position of the imaginary line segment connecting both ends of the concave curve (hereinafter referred to as 'first virtual line segment') to the concave curve in the vertical direction,

A second bisected position of the first arc in a vertical direction at a bisected position of a virtual line segment (hereinafter referred to as a 'second virtual line segment') connected in a vertical direction to the fourth arc at one end of the first arc side of the concave curve. Magnetic gear, characterized in that more than 30% and less than 40% of the length to the virtual line segment (hereinafter referred to as 'third virtual line segment') connecting the second position of the fourth and second.
The method of claim 5, wherein

The concave length is calculated by the following Equation 3 magnetic gear.

[Equation 3]

Here, D pi is the inner diameter of the fourth arc, D po is the inner diameter of the first arc, N p is the number of pole pieces.
At least two magnetic gears of any one of claims 1 to 6,

Among the magnetic gears, the output rotor of the first magnetic gear is connected directly to the input rotor of the second magnetic gear multiple type magnetic gear.
A magnetic gear according to any one of claims 1 to 6;

At least one inner pole piece module spaced apart from an inner rotor of the magnetic gear and having a plurality of pole pieces; And

And at least one intermediate rotor provided between the inner pole piece module and the pole piece module of the magnetic gear.
Input side rotor;

An output side rotor spaced apart from the input side rotor on a rotation axis extension of the input side rotor; And

A pole piece module surrounding the input side rotor and the output side rotor outside the input side rotor and the output side rotor, having a plurality of pole pieces radially positioned on a rotation axis, and transmitting magnetic force of the input side rotor to the output side rotor; Including,

And the input side rotor and the output side rotor are located together inside the pole piece module, and are spaced apart from each other with the pole piece module.
The method of claim 9,

The pole piece module includes a pole piece module support member for supporting the pole pieces so as to remain radial with respect to the axis of rotation,

An outer ring is fixed inside one side of the pole piece module support member, an inner ring is fixed to an input shaft of the input side rotor, and an input shaft support bearing for allowing the input side rotor to rotate while being spaced apart from the pole piece module;

An outer ring is fixed to the inside of the other side of the pole piece module support member, the inner ring is fixed to the output shaft of the output side rotor, and an output shaft support bearing for allowing the output side rotor to rotate while being spaced apart from the pole piece module; And

And a rotor connection bearing configured to rotate the output shaft of the input rotor and the input shaft of the output rotor while rotating so that the output shaft of the input rotor and the input shaft of the output rotor are rotated with each other.
At least two magnetic gears of claim 10 or 11,

Among the magnetic gears, the output rotor of the first magnetic gear is connected directly to the input rotor of the second magnetic gear multiple type magnetic gear.