WO2016036116A1

WO2016036116A1 - Salient pole-type magnetic gear

Info

Publication number: WO2016036116A1
Application number: PCT/KR2015/009200
Authority: WO
Inventors: 김용재; 김민석; 김찬호
Original assignee: 조선대학교산학협력단
Priority date: 2014-09-03
Filing date: 2015-09-01
Publication date: 2016-03-10
Also published as: KR101669984B1; CN106165275B; KR20160028288A; CN106165275A

Abstract

The present invention relates to a magnetic gear and, more specifically, to a salient pole-type magnetic gear, which: replaces a magnet of any one pole of magnet dipoles of the inner rotor and/or the outer rotor with a salient pole having an iron core stacked thereon such that a rare-earth permanent magnet can be used less; and improves the form of a pole piece so as to concentrate magnetic flux on a pore such that transfer torque can be improved and a reduction in torque ripple can be implemented.

Description

Salient magnetic gear

The present invention relates to a magnetic gear, and more specifically, to replace the magnet of one of the magnets of the inner rotor or the outer rotor, the inner rotor and the outer rotor with the salient pole of the iron core to reduce the use of rare earth permanent magnets. It is possible to improve the shape of the pole piece, and to concentrate the magnetic flux in the air gap, and the present invention relates to a salient magnetic gear capable of improving the transmission torque and reducing the torque ripple.

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.

When the magnets are disposed in the

rotors

11 and 12 in a bipolar manner, a gear capable of high torque output and high speed rotation can be manufactured, but the use cost of the rare earth permanent magnet is increased.

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]

On the other hand, the pole piece (13a) of the conventional magnetic gear (1) has a vertical cross section of the same center angle and the outer arc 13aa and the inner arc 13ab, the outer arc 13aa and the inner arc 13ab are different in diameter 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.

[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 problems and an object of the present invention is to provide a magnetic gear that can reduce the production cost by reducing the use of rare earth permanent magnets.

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.

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 located between the inner rotor and the outer rotor, the inner rotor to the outer rotor. Or a pole piece module including a plurality of pole pieces spaced apart from each other to transfer magnetic flux from the outer rotor to the inner rotor, wherein at least one of the inner rotor and the outer rotor is provided. The rotor provides a magnetic gear, characterized in that the surface is a salient rotor in which magnets and salient poles are alternately stacked radially with respect to the axis of rotation.

In a preferred embodiment, the outer rotor is a salient rotor, the outer rotor comprising: a cylindrical outer rotor; A plurality of magnets radially spaced apart from each other on an inner surface of the outer rotor with a magnetic force toward the rotating shaft (hereinafter, referred to as an 'outer magnet'); And a plurality of salient poles (hereinafter, referred to as 'outer salient poles') formed between the outer magnets by forming iron cores stacked on inner surfaces of the outer rotor.

In a preferred embodiment, said inner rotor is a salient rotor, said inner rotor comprising: a cylindrical inner rotor; A plurality of magnets radially spaced apart from each other on the outer surface of the inner rotor with a magnetic force toward the opposite direction of the rotating shaft (hereinafter referred to as an 'inner magnet'); And a plurality of protrusions (hereinafter, referred to as 'inner protrusions') formed by stacking iron cores on the outer surface of the inner rotor, respectively provided between the inner magnets.

In addition, the outer rotor and the inner rotor may each be composed of a pole type rotor.

In a preferred embodiment, the cross section of each pole piece comprises a first arc, a second arc and a first arc having a same position and center angle as the center and having an inner diameter smaller than the inner diameter of the first arc. A first figure enclosed by a line connecting the arc and each end and the other end of the second arc, the third arc with the same position and inner diameter as the center of the second arc and having a central angle greater than the center angle of the second arc; The shape of the 3rd arc and the center, the position and center angle are the same, and the inner diameter is smaller than the inner diameter of the said 3rd arc, and the 2nd figure enclosed by the line which connects each end and each other end of the said 3rd and said 4th arcs Although having a second bisected position of the second arc and the second bisected position of the third arc 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 has the following excellent effects.

First, according to the magnetic gear of the present invention, the outer rotor or the inner rotor, the outer rotor and the inner rotor has the advantage of lowering the manufacturing cost by reducing the use of the rare earth permanent magnet by configuring a pole type rotor.

In addition, according to the magnetic gear of the present invention, even if the rotor is configured as a pole type, there is an advantage that can compensate for the reduction of torque by adjusting the size of the magnet and the pole.

In addition, according to the magnetic gear of the present invention, it is possible to concentrate the magnetic flux in the void by limiting the variables α, β, and γ regarding the cross-sectional shape of the pole piece, improving torque transmission and lowering torque ripple, thereby improving power transmission rate and reliability. It can be effected.

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.

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

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

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

6 is a view for explaining the pole piece shape of the magnetic gear according to the embodiments of the present invention,

7 to 9 are views for explaining a parameter for determining the shape of the pole piece of the magnetic gear according to embodiments of the present invention,

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

FIG. 11 is a diagram illustrating a multilayer type magnetic gear according to another exemplary embodiment of the present invention.

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. Like numbers refer to like elements throughout the specification.

Referring to FIG. 3, 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 Fig. 3, the magnetic gear 100 of the present invention is shown as being a magnetic gear of a cylindrical rotation type, but can be manufactured in a disk rotation type, a flat plate linear type, and a cylindrical linear type (for example, in Patent Document 1). Please refer to the types of disk rotation, flat plate linear and cylindrical linear.)

In addition, the outer rotor 110 is a salient pole with a salient pole formed between the magnets 112 and the magnets 112 radially positioned with respect to the rotation axis c on the inner side.

In detail, the outer rotor 110 is attached to the cylindrical outer rotor 111, radially spaced apart from the inner surface of the outer rotor 111 about the rotation axis (c), toward the rotation axis (c) And a plurality of magnets 112 having a magnetic force (hereinafter, referred to as 'outer magnets') and protrusions 111a (hereinafter referred to as 'outer protrusions') respectively provided between the outer magnets 112.

In addition, the outer salient pole 111a is formed by stacking iron cores on the inner surface of the outer rotor 111 and is also called an iron pole.

In addition, in the present invention, the outer salient pole 111a is described as being stacked on the outer rotor 111, but the outer salient pole 111a and the outer rotor 111 may be integrally manufactured.

That is, the magnetic gear 100 according to the first embodiment of the present invention has a magnet magnetized in a direction toward the rotation axis c without the magnet having a bipolar magnet as compared to the conventional magnetic gear 10. Only because it is possible to reduce the amount of permanent magnets has the advantage of low production cost.

In addition, the inner rotor 120 includes an inner rotor 121 and a plurality of magnets 122 that are attached in a bipolar manner to the outer side of the inner rotor 121.

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, although not shown, the pole piece module 130 may include 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 exists between the pole pieces 131 and the outer rotor 110, and an inner air gap exists between the pole pieces 131 and the inner rotor 120. The pores 110a and 120a act as resistances in the magnetic circuit, so that the magnetic flux is concentrated.

On the other hand, in the first embodiment of the present invention, the magnetic gear 100 is reduced in torque in proportion to the decrease in the amount of magnets.

This torque reduction can be compensated by adjusting the sizes of the outer magnet 112 and the outer salient pole 111a, and in detail, the center angle θ and the outer salient pole of the outer magnet 112 as shown in Table 1 below. Compensation was possible by adjusting the stacking width L of (111a).

Table 1

division		Conventional magnetic gear	Magnetic gear according to the first embodiment of the present invention in which the center angle θ and the stacking width L are adjusted
Center angle of outer magnet (deg)		8.6	10
Stacking width (mm)		100 (magnet length in the direction of the axis of rotation)	126.6
Gear ratio		10.5	10.5
Number of poles of inner rotor		4
Number of poles on the outer rotor		42
Number of pole pieces		23
talk	Inner rotor torque (Nm)	18.3	18.3
	Inner rotor torque ripple (%)	4.1	6.2
	Outer rotor torque (Nm)	193.2	192.9
	Outer rotor torque ripple (%)	0.1	0.2
Print	Inner rotor (W)	1919.4	1917.5
	Outer rotor (W)	1926.7	1923.9

Referring to FIG. 4, the inner rotor 110 of the magnetic gear 100a according to the second embodiment of the present invention has a cylindrical inner rotor 121 and a rotating shaft c on the outer surface of the inner rotor 121. ) Are radially spaced apart from each other, and are provided with a plurality of magnets (123, hereinafter referred to as 'inner magnets') having magnetic force in a direction opposite to the rotation axis c, and provided between the inner magnets 123, respectively. (121a, hereinafter referred to as 'inner salient pole').

In addition, as shown in FIG. 4, when the inner magnets 123 are composed of two, the inner magnets 123 are disposed in directions facing each other with respect to the rotation axis c of the inner magnets 123.

In addition, in the present invention, the inner salient pole 121a is described as being stacked on the inner rotor 121, but the inner salient pole 121a and the inner rotor 121 may be integrally manufactured.

That is, the magnetic gear 100a according to the second embodiment of the present invention can reduce the amount of permanent magnets provided in the inner rotor 120 as compared with the conventional magnetic gear 10, thereby providing a low manufacturing cost. .

5, the magnetic gear 100b according to the third embodiment of the present invention is compared with the magnetic gear 100 according to the first embodiment of the present invention and the magnetic gear 100a according to the second embodiment. The outer rotor 110 and the inner rotor 120 are each composed of a salient rotor.

In addition, the outer rotor 110 of the magnetic gear 100b according to the third embodiment of the present invention is substantially the same as the outer rotor of the magnetic gear 100 according to the first embodiment, and the inner rotor 120 is Since it is substantially the same as the inner rotor of the magnetic gear 100a according to the second embodiment, a detailed description thereof will be omitted.

That is, the magnetic gear 100b according to the third embodiment of the present invention has an advantage of further reducing the amount of permanent magnets as compared to the

magnetic gears

100 and 100a according to the first and second embodiments of the present invention. have.

Table 2 below compares the permanent magnet area and pull-out torque of the conventional magnetic gear 10 and the

magnetic gears

100, 100a and 100b according to the embodiments of the present invention. It is a vote.

TABLE 2

	Permanent Magnet Area [㎡]	Pull out torque [Nm]
Conventional magnetic gear	6283 (100%)	192.8 (100%)
First embodiment of the present invention	4373 (69.6%)	131.3 (68.1%)
Second embodiment of the present invention	5051 (80.4%)	125.7 (65.1%)
Third embodiment of the present invention	3141 (50%)	96.3 (49.9%)

Referring to Table 2, the magnetic gear 100b according to the third embodiment of the present invention has the smallest area of the permanent magnet but the torque is low, and the magnetic gear 100a according to the second embodiment of the present invention is a magnet. The area reduction was the least but the torque was lower than the magnetic gear 100 according to the first embodiment of the present invention.

Therefore, it was confirmed that the magnetic gear 100a according to the first embodiment of the present invention has the smallest torque reduction amount compared to the area reduction amount, so that it is suitable for use as a power transmission device.

In addition, although the inner rotor torque ripple of the magnetic gear 100 according to the first embodiment of the present invention was relatively low as 6.15%, the magnetic gear 100a and the third embodiment according to the second embodiment of the present invention. According to the magnetic gear, the inner rotor torque ripple was 11.95% and 56.24%, respectively, so that the reliability of the magnetic gear 100 according to the first embodiment of the present invention was the highest.

FIG. 6 illustrates an example of the pole piece 131 of the

magnetic gears

100, 100a and 100b according to the embodiments of the present invention, and the

magnetic gears

100, 100a and 100b according to the embodiments of the present invention. The pole piece 131 may be manufactured to have a shape capable of concentrating the magnetic flux in the void.

Referring to FIG. 6, the shape of the pole piece 131 will be described in detail. The pole piece 131 has a bar shape parallel to the rotation axis c, and its vertical cross section has a first shape 131a and a second shape 131b. ) Has a shape bonded on the 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.

7 to 9 illustrate variables for determining the shape of the pole piece 131 of the present invention, and there are three main variables for determining the shape of the pole piece 131.

First, referring to FIG. 7, the 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. 8, 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. 9, 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.

Table 3 below shows the shape of the pole piece 131 of the magnetic gear 100 according to the first embodiment of the present invention, a pole piece 13a having a general shape like the pole piece 13a of the conventional magnetic gear 100. ) Is a table comparing torques when configured with the magnetic flux concentrated pole piece 131 shown in FIG. 6.

TABLE 3

division		Conventional pole piece form	Magnetic flux concentrated pole piece form
talk	Inner rotor torque (Nm)	12.5	13.4
	Inner rotor torque ripple (%)	6.1	3.6
	Outer rotor torque (Nm)	131.4	140.8
	Outer rotor torque ripple (%)	0.1	0.2

As can be seen from Table 3, when the pole piece 131 is composed of a magnetic flux-intensive pole piece, the torque increases.

10 is a view for explaining a multiple type magnetic gear according to another embodiment of the present invention.

Referring to FIG. 10, the multiple type magnetic gear 200 according to another embodiment of the present invention has a form in which a plurality of magnetic gears 100 according to an embodiment of the present invention are directly connected to each other.

In addition, although FIG. 10 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.

Referring to FIG. 11, the multilayer type magnetic gear 300 according to another embodiment of the present invention includes an inner pole piece module 310 and an intermediate rotor 320 in the magnetic gear 100 according to an embodiment of the present invention. It is configured to include.

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 inner pole piece module 310 and the intermediate rotor 320 should be provided in pairs.

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 shape of the magnetic flux-intensive pole piece.

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 multilayer type magnetic gear 300 according to another embodiment of the present invention, when the inner rotor 120 rotates, the inner pole piece module 311 transmits magnetic flux to the intermediate rotor 320, The magnetic flux of the intermediate rotor 320 is transmitted to the outer rotor 110 by the pole piece module 130 to rotate.

In addition, in FIG. 11, the middle rotor 320 is illustrated as a rotor in which magnets are bipolarly attached to inner and outer surfaces, but may be configured as a salient rotor in which alternating magnets and salient poles are alternately stacked. Can be reduced.

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

Therefore, according to the multilayer type magnetic gear 300 of the present invention, the outer rotor 110, the intermediate rotor 320, and the inner rotor 120 share a gear ratio that the conventional magnetic gear 10 is to implement. The magnetic gear 10 has a merit that can realize the desired gear ratio while reducing the number of poles of the magnet.

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

At least one of the inner rotor and the outer rotor is a magnetic gear, characterized in that the salient pole rotor in which the magnet and the salient pole alternately stacked radially with respect to the axis of rotation on the surface.
The method of claim 1,

The outer rotor is a salient pole rotor,

The outer rotor:

Cylindrical outer rotor;

A plurality of magnets radially spaced apart from each other on an inner surface of the outer rotor with a magnetic force toward the rotating shaft (hereinafter, referred to as an 'outer magnet'); And

Magnetic gears, characterized in that the outer rotor is formed by stacking iron cores on the inner surface, respectively provided between the outer magnets (hereinafter, referred to as 'outer protrusions').
The method of claim 1,

The inner rotor is a salient pole rotor,

The inner rotor:

Cylindrical inner rotor;

A plurality of magnets radially spaced apart from each other on the outer surface of the inner rotor with a magnetic force toward the opposite direction of the rotating shaft (hereinafter referred to as an 'inner magnet'); And

Magnetic gears, characterized in that the iron core is formed on the outer surface of the inner rotor is stacked between each of the inner magnets (hereinafter referred to as "inner salient pole").
The method of claim 1,

The outer rotor and the inner rotor are each a salient pole rotor,

The outer rotor:

Cylindrical outer rotor;

A plurality of magnets radially spaced apart from each other on an inner surface of the outer rotor with a magnetic force toward the rotating shaft (hereinafter, referred to as an 'outer magnet'); And

Included between the outer magnets, each of the protrusions (hereinafter referred to as "outer protrusions") formed by stacking iron cores on the outer rotor;

The inner rotor:

Cylindrical inner rotor;

A plurality of magnets radially spaced apart from each other on the outer surface of the inner rotor with a magnetic force toward the opposite direction of the rotating shaft (hereinafter referred to as an 'inner magnet'); And

Magnetic gears, which are provided between the inner magnets, respectively, which are formed by stacking iron cores on the inner rotor (hereinafter, referred to as 'inner protrusions').
The method according to any one of claims 1 to 4,

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 5, wherein

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 5, wherein

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 5, wherein

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 8,

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 9,

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 claim 5,

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.
Magnetic gear of claim 5;

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.