KR102087430B1 - A Rotor for a Bicycle Generator and a Generator Using the Same - Google Patents

Abstract

The present invention relates to a rotor used in a generator for a bicycle and a generator using the same. The magnetic circuit unit 30 of the rotor includes a first magnet 401 and a second magnet 402 alternately disposed along the circumferential direction of the rotation axis (a). Polarities of the first magnet and the second magnet are arranged in opposite directions along the axial direction of the rotation axis (a), and the magnetic core 50 of the ferromagnetic material constituting the magnetic circuit is disposed at one side of the first magnet and the second magnet in the axial direction. The other side in the axial direction of the first magnet and the second magnet is opposite to the rim.

Description

Rotor for a bicycle generator and a generator using the same

The present invention relates to a generator, and more particularly to a rotor and a generator using the same for a generator for bicycles.

Eddy current refers to the eddy current flowing on the metal conductor by the electromotive force generated when the magnetic flux changes in the metal conductor. The power loss caused by the eddy current is called the eddy current loss, and it becomes the heat loss and sometimes raises the temperature of the metal conductor. The force generated by such eddy currents is used for electric brakes in power meters and electric vehicles.

A ferromagnetic substance (强 磁性 體) refers to a substance that is magnetized strongly in the direction of the magnetic field when a strong magnetic field is applied from the outside and then the magnetization remains even when the external magnetic field disappears. In this case, each atom of the material is like a magnet. Iron (Fe) is a representative ferromagnetic material.

Non-magnetic materials (non-magnetic substances, non-magnetic substances) refers to a weak magnetic material or a material having no magnetic at all. Paramagnetic material to be described later. The specific permeability is close to 1 and is hardly affected by the magnetic field.

A paramagnetic substance (paramagnetic substance) is a substance which is magnetized in the direction of the magnetic field when put into the magnetic field and does not magnetize when the magnetic field is removed. Aluminum, tin, platinum, iridium, etc. belong to this. The magnitude of magnetization is proportional to the magnitude of the surrounding magnetic field, and the degree of magnetization is expressed by the susceptibility. The susceptibility grows in inverse proportion to temperature, which is called Curie's Law.

Meanwhile, as in Patent Document 1, conventionally, a rotor is installed near a bicycle rim made of aluminum and magnets are attached around the rotor, so that the N pole and the S pole are alternately arranged, thereby rotating the bicycle rim. An eddy current is generated on the bicycle rim by the magnetic flux of the magnet, and the magnet around the rotor is attracted again by the magnetic action generated by the eddy current, thereby rotating the rotor in a contactless manner as the rim rotates. By using the point of rotation of the magnet around the rotor used to generate the eddy current, a generator has been developed in which a current is induced in the coil winding by placing a coil winding around the magnet.

However, the generator of such a structure induces electromotive force through a magnet attached to the rotor to induce eddy current, and the braking force caused by the load current acts by driving the load, resulting in a loss of rotational force over the energy lost in the power generation process Slip phenomenon (the speed of the rotor does not follow the speed of the rim) occurs.

In addition, since the magnet is attached to the rotor to induce the eddy current to induce the current, the magnet attached to the rotor should be placed close to the rim, which acts as a space constraint, thereby forming the magnetic path required for power generation. The core used to derive is not available. That is, due to the space constraints around the rotor, the core cannot be installed, and thus, the magnets formed by the magnets attached to the rotor have no core and are thus greatly lost in the air, thus failing to generate sufficient power generation.

Accordingly, as disclosed in Patent Documents 2 to 4, a generator having high power generation efficiency has been developed by installing a magnet necessary for power generation separately from a magnet rotating by eddy current. The generator of this structure has significantly improved the power generation efficiency compared to the generator of Patent Document 1, there was an advantage that can be applied to all the bicycle rims of various materials. However, since the cover of the elastic material applied to the rotors of Patent Documents 2 to 4 is exposed to the outside as a whole, there is a problem that the magnet housed therein cannot be firmly supported. In addition, in order to secure the shape retaining force of the cover of the elastic material, the thickness of the cover should be designed so thick, which makes the distance between the magnet and the paramagnetic rim farther, and as a result, lowers the amount of eddy current generated in the rim.

In addition, with the recent increase in the variety of electronic devices used with bicycles, still higher power generation efficiency is required.

Patent Publication No. 1690387 Patent Publication No. 1550172 Patent Publication No. 1758463 Registered Patent Publication No. 1825714

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotor structure of a non-contact generator that can cause eddy current induction and thereby non-contact rotation more quickly while minimizing the rotational moment of inertia of the rotor.

In addition, an object of the present invention is to provide a non-contact generator for a bicycle to increase the power generation efficiency by applying a rotor to which such a structure is applied.

In order to solve the above problems, the present invention provides a rotor (1) of a non-contact generator is installed facing the object to rotate 80. The rotational object 80 may be a rim 80 of the bicycle wheel, and the rim 80 may be a paramagnetic material including an aluminum material.

The rotor (1), the magnetic circuit portion 30; And a housing 10 accommodating the magnetic circuit part 30 and rotating together with the magnetic circuit part 30. The magnetic circuit unit 30 forms a magnetic circuit causing an eddy current in the rim 80, and the housing 10 protects the magnetic circuit unit 10. The housing 10 includes a material through which a magnetic field passes.

The magnetic circuit unit 30, a plurality of magnets 40; And a magnetic core 50 in contact with the magnet 40 to provide a path of the magnetic circuit. The magnetic core 50 includes a ferromagnetic material. Accordingly, the magnetic core 50 is provided with a path of the magnetic circuit, and is attached to the magnet 40 by an attractive force to serve to fix the plurality of magnets 40.

The plurality of magnets 40 may include a first pole surface 43 facing the first direction of the rotation axis a of the rotor 1 and a second direction opposite to the first direction of the rotation axis a. A first magnet 401 including a second polar surface 44 facing the first magnet 401; And a second pole surface 44 facing the first direction of the rotation axis a of the rotor 1 and a first pole surface 43 facing the second direction opposite to the first direction of the rotation axis a. It includes; a second magnet 402 including).

The first magnet 401 and the second magnet 402 are alternately arranged along the circumferential direction of the rotation axis (a).

The magnetic core 50 is in contact with the second pole surface 44 of the first magnet 401 and the first pole surface 43 of the second magnet 402 to form a first circuit part of a ferromagnetic material that forms a magnetic circuit. And 51.

Accordingly, the magnetic field formed in the air is concentrated in the section between the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402.

The moving object 80 faces the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 so that the first magnet 401 is formed. The magnetic circuit region between the first pole surface 43 and the second pole surface 44 of the second magnet 402 overlaps the moving object 80.

According to the rotor, since the magnetic circuit in the second direction of the rotating shaft is constituted by the first annular portion 51 which is a ferromagnetic material, there is almost no magnetic flux loss, and the paramagnetic object 80 in which the magnetic field is rotated by the magnet 40 is rotated. Focused on the rim. Thus, the amount of eddy current generated on the rim increases, and as a result, the rotational force of the rotor becomes larger.

The magnetic core 50 includes: the first annular portion 51 extending radially at a position spaced apart from the rotation axis a of the rotor 1; A first central cylindrical wall 52 extending in the first direction of the rotation axis a from the inner edge of the first annular portion 51; And a shaft hole 56 coupled to the rotation shaft a. Accordingly, the inner circumferential surface 42 of the magnet 40 is supported by the first central cylindrical wall 52 and the second pole surface 44 of the first magnet 401 facing the second direction of the rotation axis a. ) And the first pole surface 43 of the second magnet 402 are supported by the first annular portion 51.

In addition, the outer circumferential surface 41 of the magnet 40 is supported by the housing 10.

As described above, according to the present invention, since the magnetic core 50 of the ferromagnetic material constituting the magnetic circuit of the magnet 40 cooperates with the housing 10 to fix the magnet 40, the structure constituting the magnetic circuit and the magnet 40 are fixed. The structure can be implemented integrally, the structure for fixing the magnet 40 is simple yet robust.

In addition, when the arcuate side surfaces 45 of the first magnet 401 and the second magnet 402 which are adjacent to each other are in contact with each other, the plurality of magnets 40 may be formed using only the magnetic core 50 and the housing 10 having a simple shape. ) Can be firmly supported and fixed.

The magnetic core 50 may include a second annular portion 53 extending radially inwardly from the first central cylindrical wall 52; And a second central cylindrical wall 54 extending from the inner edge of the second annular portion 53 in the direction of the rotation axis a, wherein the housing 10 is formed of the second central cylindrical wall 54. It includes a central portion 73 is inserted into the inner peripheral surface.

According to this, since the magnetic core 50 of the high-strength ferromagnetic material supports the housing 10, the rotational moment of inertia of the entire rotor can be reduced by constructing the housing 10 from a relatively lightweight synthetic resin material. Even if the rotation speed of the 80 is slow, the rotation of the rotor 1 can be sufficiently induced.

Meanwhile, the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 are covered by the cover surface member 71 of the housing 10. An elastic material 60 is interposed between the first pole surface 43 of the single magnet 401, the second pole surface 44 of the second magnet 402, and the cover surface member 71. Accordingly, the magnet 40 may be protected by the cover surface member 71, and external shock applied to the magnet 40 by the elastic material 60 may be alleviated.

The elastic member 60 is provided with a projection 62 protruding in the direction of the cover surface member 71, and the cover surface member 71 is provided with a projection hole 72 through which the projection 62 passes. The protrusion 62 penetrates the protrusion hole 72 to protrude more than the cover surface member 71.

According to this, even if the rim 80 hits the rotor 10, the elastic projections 62 strike the rim 80 and can absorb the shock sufficiently, the momentum of the rim 80 protrusions 62 It is transmitted to the rotor (1) through can further promote the rotation of the rotor (1). However, since the cover surface member 71 maintains the shape of the elastic member 60, which is relatively difficult to maintain a magnetic shape, the thickness of the elastic member 60 and the cover surface member 71 can be reduced by that, resulting in rim The amount of eddy currents generated can be further increased.

According to the rotor structure of the present invention, since the magnetic circuit is constituting the magnetic circuit, but firmly supports the entire rotor including a magnet, the housing can be made lighter to minimize the rotational moment of inertia of the rotor.

In addition, while placing the distance between the magnet and the rim as close as possible, it is possible to sufficiently absorb the impact that can be applied to the magnet to prevent damage to the rotor including the magnet, even if the rim hits the rotor, the rotational force of the rim Can be transmitted to the rotor to prevent the rotor from stopping.

In addition, while exhibiting the above functions, it is possible to configure the rotor to be lighter and to place the distance between the rotor and the rim closer, by applying the rotor to the generator can increase the power generation efficiency by that much.

In addition to the effects described above, the specific effects of the present invention will be described together with the following description of specifics for carrying out the invention.

1 is an exploded perspective view of a rotor according to the present invention.
FIG. 2 is a cross-sectional perspective view showing a cross-section cut in half in the state in which the rotor of FIG. 1 is assembled.
3 is a cross-sectional view of FIG. 2.
4 is an exploded perspective view of the magnetic circuit part of the rotor.
FIG. 5 is a side view and a perspective view of the magnetic circuit unit of FIG. 4 assembled; FIG.
FIG. 6 is a diagram illustrating an embodiment in which magnetic circuits and eddy currents are formed in a state in which the magnetic circuit unit of FIG.
7 is a view showing a state in which a generator with a rotor according to the present invention is installed on a bicycle.

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

The present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only this embodiment to complete the scope of the invention to those skilled in the art and complete the scope of the invention to those skilled in the art It is provided to inform you.

The rotor 1 applied to the contactless generator for a bicycle according to the present invention includes a housing 10 and a magnetic circuit unit 30. The housing 10 accommodates the magnetic circuit portion 30 and rotates integrally with the magnetic circuit portion 30.

[housing]

The rotor 1 has a low-profile cylindrical appearance, which is defined by the housing 10. The housing 10 has a hollow cylindrical shape and includes a body housing 20 and a cover housing 70.

The body housing 20 includes a base member 21 in the form of a disk and a cylindrical wall 23 in a ring shape. In the center of the base member 21, a shaft hole 22 to which the rotating shaft a is fastened is formed. The rotating shaft a and the shaft hole 22 are cut D, and the rotational force of the rotor 1 can be transmitted to the rotating shaft a reliably. Of course, in order to secure the coupling strength of the shaft hole 22 and the rotating shaft (a), the base member 21 around the shaft hole 22 is thickly attached, the flesh may be attached to the inner space of the housing as shown have.

The base member 21 has a disk shape extending radially with respect to the rotation axis a, and the cylindrical wall 23 is parallel to the axial direction of the rotation axis a at the radially outer end of the base member 21. It is a cylindrical shape extending in a first direction. Accordingly, the body housing 20 has an open shape toward the first direction (right direction in the drawing in FIG. 3) of the rotating shaft a.

The rotating shaft a is press-fitted into the shaft hole 22 in the first direction in a second direction (left direction in the drawing in FIG. 3).

A step 24 is formed at the inner edge of the first direction end portion of the cylindrical wall 23 of the body housing 20.

The stepped 24 is fitted with a disc shaped cover housing 70 is fixed. That is, the cover housing 70 covers the open portion of the body housing 20 to define the internal space of the housing 10.

The cover housing 70 includes a disc shaped cover surface member 71 and a cylindrical center member 73 extending from the center of the cover surface member 71 toward the second direction of the rotation axis a. . Therefore, when viewed from the outside, the core member 73 is not exposed to the outside, and the body housing 20 and the cover housing 70 define a short cylindrical shape such as a hockey puck as a whole.

A shaft hole 74 into which the rotating shaft a is fitted is provided at the center of the second direction end portion of the center member 73. The shaft hole 74 is formed in a groove shape that does not penetrate through the center member 73, and has a D cut, and the direction of the shaft hole 22 and the D cut of the body housing 20 are aligned. Therefore, the rotating shaft a of the cut D is coupled to both shaft holes 22 and 74 of the housing 10.

Since the magnetic circuit unit 30 to be described later includes a high-strength ferromagnetic material, even if the housing 1 is made of a relatively lightweight synthetic resin material, the overall rotor 1 may be maintained. Of course, the rotary shaft (a) is also coupled to the ferromagnetic material portion of the magnetic circuit portion 30 can increase the overall shaft coupling force.

[Magnetic circuit part]

The magnetic circuit unit 30 is installed inside the housing 10. The magnetic circuit unit 30 may include a plurality of magnets 40 for generating a magnetic field, and a magnetic core 50 made of a ferromagnetic material attached to the magnets 40 to form a magnetic circuit.

The plurality of magnets 40 includes a first magnet 401 and a second magnet 402 of the same type. The magnet includes a first pole surface 43 and a second pole surface 44. The first pole surface 43 may be any one of S and N poles, and the second pole surface 44 may be the other pole of the S and N poles.

The first magnet 401 is a magnet disposed so that the first pole surface 43 faces the first direction of the rotation axis a, and the second pole surface 44 faces the second direction of the rotation axis a. The second magnet 402 is disposed such that the first pole surface 43 faces the second direction of the rotation axis a, and the second pole surface 44 faces the first direction of the rotation axis a. Refers to a magnet. That is, the first magnets and the second magnets are oriented so that the polarities face opposite to each other.

The plurality of magnets 40 are provided in the rotor 1 in such a manner that the first magnets 401 and the second magnets 402 are alternately arranged in the circumferential direction along the circumference of the rotation axis a. In the embodiment, a structure in which three first magnets 401 and three second magnets 402 are alternately arranged is illustrated. However, the number is not limited to this and can be changed in consideration of the length of the circumference.

Each magnet 40 may have a three-dimensional shape in which a rectangular cross section is formed by rotating by 60 degrees in an arc direction based on the rotation axis a. The magnet 40 includes a first pole surface 43 and a second pole surface 44 facing and facing the axial direction of the rotation axis. In the magnet 40, the inner circumferential surface 42 disposed close to the rotating shaft and the outer circumferential surface 41 disposed far from the rotating shaft have an arc-shaped curved surface. And the arcuate side surface 45 arrange | positioned in the circumferential direction of the magnet 40 has a rectangular surface. The magnets 40 are installed so that the arcuate side surfaces 45 abut one another. Of course, each magnet may be installed at a distance from each other. However, as shown in the embodiment of the present invention, when the arcuate side surfaces 45 between the magnets 40 are installed to be in contact with each other, the magnets 40 are manufactured as one ring shape without a separate structure for supporting the magnets 40. It is possible.

The magnetic core 50 is formed on the surface of the magnets 40 facing the second direction of the rotation axis a, that is, the second pole surface 44 of the first magnet 401 and the first pole surface 43 of the second magnet. Is installed. The magnetic core 50 is made of a ferromagnetic material to form a magnetic path of the magnetic circuit. Accordingly, there is almost no loss of magnetic flux in the magnetic path from the first pole surface 43 of the second magnet, N pole, to the second pole surface 44 of the first magnet 401, S pole.

The magnetic core 50 includes a first annular portion 51 extending in the radial direction at a position radially spaced from the rotation axis (a). The first annular portion 51 is a flat donut shape. The first annular portion 51 has an area corresponding to the first pole surface 43 of the second magnet and the second pole surface 44 of the first magnet 401, and the first pole surface 43 of the second magnet. And magnetically adsorbed on the second pole surface 44 of the first magnet 401.

The magnetic core 50 further includes a first central cylindrical wall 52 extending in the first direction of the rotation axis a at the inner edge of the first annular portion 51. The first central wall 52 is extended by about 1/2 of the thickness in the direction of the rotation axis (a) of the magnet. The first pole surface 43 of the second magnet 402 where the magnetic flux is concentrated and the second pole surface 44 of the first magnet 401 are in contact with the first annular portion 51, but the second magnet 402 In the vicinity of the inner circumferential surface 42 adjacent to the first pole surface 43 and the second pole surface 44 of the first magnet 401, the magnetic flux may be weakly formed. The magnetic circuit path of the magnetic flux can be provided. In addition, the outer circumferential surface of the first central cylindrical wall 52 is in contact with the inner circumferential surface 42 of the magnet 40 and supports the magnet 40.

In addition, the magnet 40 and the magnetic core 50 is accommodated in the housing 10 as shown. In a state where the magnetic circuit portion 30 is accommodated in the housing 10, the first annular portion 51 of the magnetic core is in contact with and supported by the base member 21 of the body housing 20, and the outer peripheral surface 41 of the magnet 40. Is supported in contact with the inner circumferential surface of the cylindrical wall 23 of the body housing (20).

The inner circumferential surface 42 of the plurality of magnets 40 is supported by the first central cylindrical wall 52 of the magnetic core 50, and the outer circumferential surface 41 is supported by the housing 10. That is, the magnet 40 is supported by the first central cylindrical wall 52 and the cylindrical wall 23 in the radial direction.

A second annular portion 53 extending radially inwardly is provided at an end portion of the first central cylindrical wall 52 of the magnetic core 50 in the first direction side end portion of the rotation shaft a. Perforations may be formed in the second annular portion 53 to maintain the overall rigidity of the magnetic core 50 but to lower the mass of the magnetic core 50.

At the inner edge of the second annular portion 53, a second central cylindrical wall 54 extending in the second direction of the rotation shaft a is provided. The second central cylindrical wall 54 has a cylindrical shape.

The inner circumferential surface of the second central cylindrical wall 54 may be fitted with the central member 73 of the cover housing 70. That is, the inner circumferential surface of the second central cylindrical wall 54 and the outer circumferential surface of the central member 73 may be pressed into and in contact with each other.

A second annular portion 55 extending radially inwardly at a second side edge of the rotation axis a of the second central cylindrical wall 54. The center of the third annular portion 55 is provided with a shaft hole 56 into which the rotation shaft a is inserted. The shaft hole 56 is cut in D, and is aligned with the other shaft holes 22 and 74 so that the rotation shaft a can be fitted into the shaft holes 22, 56 and 74.

The rotating shaft a is coupled to the magnetic core 50 made of a ferromagnetic metal material such as iron (Fe). In addition, the magnetic core 50 has excellent rigidity in terms of geometry due to the shape of the first central cylindrical wall 52 and the second central cylindrical wall 54. In addition, the magnetic core 50 is also firmly coupled to the body housing 20 by the first annular portion 51, and is also firmly coupled to the cover housing 70 by the second central cylindrical wall 54.

That is, the magnetic core 50 is accommodated in the housing 10 and functions as a skeleton supporting the overall rigidity of the rotor 1, and is adsorbed by the magnet 40 to form a magnetic circuit to minimize the loss of magnetic flux. Together with the housing 10, the plurality of magnets 40 may be firmly supported.

Accordingly, the overall rigidity of the rotor 1 can be sufficiently secured while reducing the number of parts, and the magnet 40 can be protected by the relatively lightweight housing 10.

Referring to FIG. 5, the magnetic circuit unit 30 of the present invention described above constitutes a plurality of magnetic circuits extending in the first direction in the axial direction a. Six magnetic circuits of the magnetic circuit unit 30 composed of six magnets 40 are formed.

Since the magnetic circuit at the end in the second direction of the rotating shaft a is formed in the magnetic core 50 which is a ferromagnetic material, there is almost no loss of magnetic flux. Therefore, the strength of the magnetic field formed in the first direction (that is, the right side in the drawing of FIG. 5) of the rotating shaft a is greater than that of the magnet 40.

As shown in FIG. 6 and FIG. 7, the magnet 40 may be installed close to the bicycle rim 80, which is not in contact with the moving paramagnetic material. And the rotation axis (b) of the rim 80 and the rotation axis (a) of the rotor may be arranged in parallel.

Then, the moving object, that is, the rim 80, faces the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402, so that the first magnet ( The magnetic circuit region between the first pole surface 43 of 401 and the second pole surface 44 of the second magnet 402 overlaps the moving object 80.

When such a strong magnetic field is applied to the rim 80 that rotates, a greater amount of eddy current is generated in the rim 80 of the paramagnetic body. The eddy current in turn generates a magnetic force on the rim 80 of the paramagnetic body, and this magnetic force interacts with the magnetic field of the magnet 40 to rotate the rotor 1 including the magnet 40.

The generator 90 may be installed at an opposite portion of the rim 80 based on the rotor 1. Accordingly, the rotation of the rotor 1 may rotate the generator 90.

[Shock absorption structure]

The rim of the bicycle may have some rumble shape and not a circle that is completely perpendicular to its axis of rotation b. In addition, in the manufacturing process of the paramagnetic aluminum rim, a part of the rim may include a ferromagnetic material such as iron therein. Accordingly, the rim 80 and the rotor 1 of the bicycle can collide with each other by the slump shape of the rim, or by the attractive force between the ferromagnetic portion of the rim and the magnet inside the rotor. And this bump can be repeated for every revolution of the wheel.

If the magnet 40 directly hits the rim 80 or the cover housing 70 hits the rim 80 directly, the magnet 40 or the housing 10 may be damaged, and the rotating rotor 1 ) Rotation stops or the rotation speed decreases, and as a result, power generation may not be performed smoothly.

In the present invention, the cover housing 70 and the magnets 40 are interposed between the elastic member 60 of the flat shape. That is, the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 are covered by the cover surface member 71 of the housing 10. An elastic material 60 is interposed between the first pole surface 43 of the magnet 401 and the second pole surface 44 of the second magnet 402 and the cover surface member 71. 40 is covered with an elastic material 60 and protected.

The elastic material 60 includes a flat ring 61 portion having a center hole. The flat ring 61 is interposed between the cover surface member and the magnet 40, and the radially outer edge of the flat ring 61 can be fitted to the step 24. In addition, the radially outer edge of the cover surface member 71 may be fixed to the stepped portion 24 while pressing the edge of the flat ring 61. The central housing 73 is penetrated by the cover housing 70 to the central portion of the flat ring 61.

The flat ring 61 of the elastic member 60 is provided with a projection 62 protruding toward the cover surface member 71. In addition, the cover surface member 71 is provided with a protrusion hole 72 through which the protrusion 62 passes. The protrusion 62 penetrates the protrusion hole 72 and protrudes further than the cover surface member 71.

According to this structure, even if the elastic material 60 is designed to be thin, since the cover housing 70 having a higher rigidity than the elastic material 60 is firmly held to support the elastic material 60, the cover surface member 71 is used. In contrast to when not, the combined thickness of the cover housing 70 and the elastic material 60 can be made even thinner. Accordingly, the magnet 40 and the rim 80 can be arranged closer, which can induce a stronger rotational movement of the rotor caused by the eddy current.

The protrusion 62 is more protruding than the cover housing 70 and is disposed closer to the rim 80, so that the protrusion 62 hits the protrusion 62 even when the rim 80 hits the rotor 1. The shock is transmitted to and absorbed by the protrusion 62 of the elastic material. In addition, since the elastic member 60 including the protrusion 62 is made of high friction material such as rubber, when the rotating rim 80 hits the rotor 1, the rotational force of the rim is the rotor 1. It is mechanically transmitted to, resulting in a higher speed of rotation of the rotor 1.

The protrusion 62 is provided at a position where it is expected to face the rim 80 when the generator 90 and the rotor 1 are installed as shown. The protrusion 62 may be a shape of a short spiral as shown, but the shape is not limited thereto.

Although the present invention has been described with reference to the drawings exemplified as above, the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that modifications can be made. In addition, even if the above described embodiments of the present invention while not explicitly described by describing the effect of the configuration of the present invention, it is obvious that the effect predictable by the configuration is also to be recognized.

10: housing
20: body housing
21: base member
22: shaft hole
23: cylindrical wall (cylindrical)
24: step
30: magnetic circuit part
40: magnet
401: first magnet
402: second magnet
41: outer circumference
42: inner circumference
43: first polar plane
44: second polar plane
45: arcuate side
50: magnetic core (ferromagnetic)
51: first annular portion
52: first central wall (cylindrical)
53: second annular portion
54: second central wall (cylindrical)
55: third annular portion
56: shaft hole
60: elastic material
61: flat ring
62: turning
70: cover housing
71: cover surface member
72: protrusion hole
73: core material
74: shaft hole
80: rim
90: generator
a: axis of rotation of the rotor
b: axis of rotation of the rim

Claims (5)

As a rotor (1) of a non-contact generator is installed facing the moving object (80),
The rotor (1), the magnetic circuit portion 30; And a housing 10 accommodating the magnetic circuit part 30 and rotating together with the magnetic circuit part 30.
The magnetic circuit unit 30, a plurality of magnets 40; And a magnetic core 50 in contact with the magnet 40 to provide a path of a magnetic circuit.
The plurality of magnets 40,
The first pole surface 43 facing the first direction of the rotation axis a of the rotor 1, and the second pole surface 44 facing the second direction opposite to the first direction of the rotation axis a. A first magnet 401 comprising a; And
The second pole surface 44 facing the first direction of the rotation axis a of the rotor 1, and the first pole surface 43 facing the second direction opposite to the first direction of the rotation axis a. It includes; a second magnet 402 including;
The first magnet 401 and the second magnet 402 are alternately arranged along the circumferential direction of the rotation axis (a),
The magnetic core 50 is in contact with the second pole surface 44 of the first magnet 401 and the first pole surface 43 of the second magnet 402 to form a first circuit part of a ferromagnetic material that forms a magnetic circuit. Including 51,
The moving object 80 faces the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 so that the first magnet 401 is formed. The magnetic circuit region between the first pole surface 43 and the second pole surface 44 of the second magnet 402 overlaps the moving object 80,
The magnetic core 50 is:
The first annular portion 51 extending radially at a position spaced apart from the rotation axis a of the rotor 1;
A first central cylindrical wall 52 extending in the first direction of the rotation axis a from the inner edge of the first annular portion 51; And
And a shaft hole 56 coupled to the rotation shaft a.
The inner circumferential surface 42 of the magnet 40 is supported by the first central cylindrical wall 52, the outer circumferential surface 41 of the magnet 40 is supported by the housing 10,
The first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 are covered by the cover surface member 71 of the housing 10,
An elastic material 60 is interposed between the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 and the cover surface member 71.
The elastic member 60 is provided with a projection 62 protruding toward the cover surface member 71, and the cover surface member 71 is provided with a projection hole 72 through which the projection 62 passes. The rotor (62) penetrates the protrusion hole (72) to protrude more than the cover surface member (71).
The method according to claim 1,
The first central wall (52) extends by about half the thickness of the magnet in the direction of the axis of rotation (a), the rotor.
The method according to claim 1,
The arcuate side surfaces 45 of the first magnet 401 and the second magnet 402 adjacent to each other are in contact with each other.
The method according to claim 1,
The magnetic core 50,
A second annular portion 53 extending radially inwardly from the first central cylindrical wall 52; And
And a second central cylindrical wall 54 extending from the inner edge of the second annular portion 53 in the direction of the rotation axis a.
The housing 10 is:
A center member 73 inserted into an inner circumferential surface of the second central cylindrical wall 54;
The central member (73) is provided with a shaft hole (74) into which the rotating shaft (a) is fitted.
As a rotor (1) of a non-contact generator is installed facing the moving object (80),
The rotor (1), the magnetic circuit portion 30; And a housing 10 accommodating the magnetic circuit part 30 and rotating together with the magnetic circuit part 30.
The magnetic circuit unit 30, a plurality of magnets 40; And a magnetic core 50 in contact with the magnet 40 to provide a path of a magnetic circuit.
The plurality of magnets 40,
The first pole surface 43 facing the first direction of the rotation axis a of the rotor 1, and the second pole surface 44 facing the second direction opposite to the first direction of the rotation axis a. A first magnet 401 comprising a; And
The second pole surface 44 facing the first direction of the rotation axis a of the rotor 1, and the first pole surface 43 facing the second direction opposite to the first direction of the rotation axis a. It includes; a second magnet 402 including;
The first magnet 401 and the second magnet 402 are alternately arranged along the circumferential direction of the rotation axis (a),
The magnetic core 50 is in contact with the second pole surface 44 of the first magnet 401 and the first pole surface 43 of the second magnet 402 to form a first circuit part of a ferromagnetic material that forms a magnetic circuit. Including 51,
The moving object 80 faces the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 so that the first magnet 401 is formed. The magnetic circuit region between the first pole surface 43 and the second pole surface 44 of the second magnet 402 overlaps the moving object 80,
The first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 are covered by the cover surface member 71 of the housing 10,
An elastic material 60 is interposed between the first pole surface 43 of the first magnet 401 and the second pole surface 44 of the second magnet 402 and the cover surface member 71.
The elastic member 60 is provided with a projection 62 protruding in the direction of the cover surface member 71, and the cover surface member 71 is provided with a projection hole 72 through which the projection 62 passes. The rotor (62) penetrates the protrusion hole (72) to protrude more than the cover surface member (71).

Images