Eddy current braking system

Abstract

To provide an eddy current brake device that can suppress an increase in an eddy current break device in the radial direction of a rotor and increase the braking force applied to the rotor.SOLUTION: An eddy current brake device includes a rotor 1 that is rotatably arranged, and a stator 2 that generates an eddy current in the rotor 1 to brake the rotor 1. The rotor 1 has a first brake portion 103 formed in a ring shape, and the first brake portion 103 is arranged such that the circumferential direction of the first brake portion 103 coincides with the circumferential direction D3 of the rotor 1. The stator 2 has a plurality of first coils 203 arranged adjacent to the first brake portion 103 in the radial direction D2 of the rotor 1. The plurality of first coils 203 are arranged side by side along the circumferential direction D3 of the rotor 1. When a current is supplied to each of the plurality of first coils 203, an eddy current is generated in the first brake portion 103, and the rotor 1 is braked.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This invention relates to an eddy current brake device.

Background Art

[0002] Conventionally, an eddy current brake device is known that includes a rotatable rotor and a stator that generates eddy currents in the rotor to brake the rotor. The rotor has a brake disk. The shape of the brake disk is disc-shaped. The brake disk is arranged along a plane orthogonal to the axial direction of the rotor. The stator has a plurality of coils. The plurality of coils are arranged side by side along the circumferential direction of the rotor. Each of the plurality of coils is arranged so as to be adjacent to the brake disk in the axial direction of the rotor. By supplying current to each of the plurality of coils, eddy currents are generated in the brake disk, and the rotor is braked (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration described in Patent Document 1, each of the plurality of coils is arranged so as to be adjacent to the brake disk in the axial direction of the rotor. Therefore, in order to increase the braking force on the rotor by enlarging each of the plurality of coils, the brake disk must be enlarged in the radial direction of the rotor. As a result, there is a problem that the eddy current brake device becomes large in the radial direction of the rotor.

[0005] This invention was made to solve the above-mentioned problems, and its purpose is to provide an eddy current braking device that can suppress the increase in the size of the eddy current braking device in the radial direction of the rotor and increase the braking force applied to the rotor. [Means for solving the problem]

[0006] The eddy current brake device according to this invention comprises a rotatably mounted rotor and a stator that generates eddy currents in the rotor to brake the rotor. The rotor has a ring-shaped first brake portion, which is arranged such that its circumferential direction coincides with the circumferential direction of the rotor. The stator has a plurality of first coils arranged adjacent to the first brake portion in the radial direction of the rotor, which are arranged in a line along the circumferential direction of the rotor. By supplying current to each of the plurality of first coils, eddy currents are generated in the first brake portion, thereby braking the rotor. Furthermore, in the eddy current brake device according to this invention, the rotor has a second brake section formed in the shape of a ring, the second brake section is arranged concentrically with the first brake section, and a plurality of first coils are arranged between the first brake section and the second brake section in the radial direction of the rotor, and when current is supplied to each of the plurality of first coils, eddy currents are generated in the first brake section and the second brake section, respectively, and the rotor is braked. Furthermore, in the eddy current brake device according to this invention, the multiple first coils are arranged in a ring shape along the circumferential direction of the rotor. Furthermore, in the eddy current brake device according to this invention, the rotor has a ring-shaped third brake portion, the third brake portion is arranged such that its circumferential direction coincides with the circumferential direction of the rotor, the stator has a plurality of second coils arranged adjacent to the third brake portion in the radial direction of the rotor, the plurality of second coils are arranged in a line along the circumferential direction of the rotor, and when current is supplied to each of the plurality of second coils, eddy currents are generated in the third brake portion, thereby braking the rotor. Furthermore, in the eddy current brake device according to this invention, the rotor has a fourth brake section formed in the shape of a ring, the fourth brake section is arranged concentrically with the third brake section, and a plurality of second coils are arranged between the third brake section and the fourth brake section in the radial direction of the rotor, and when current is supplied to each of the plurality of second coils, eddy currents are generated in the third brake section and the fourth brake section, respectively, and the rotor is braked. Furthermore, in the eddy current brake device according to this invention, the multiple second coils are arranged in a ring shape along the circumferential direction of the rotor. Furthermore, in the eddy current brake device according to this invention, the third brake section is arranged concentrically with the first brake section. [Effects of the Invention]

[0007] According to the eddy current brake device of this invention, it is possible to suppress the increase in the size of the eddy current brake device in the radial direction of the rotor and to increase the braking force applied to the rotor. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing an eddy current brake device according to Embodiment 1. [Figure 2] Figure 1 shows a cross-section of the eddy current brake device, cut along the axial and radial directions. [Figure 3] This figure shows a cross-section of the eddy current brake device shown in Figure 1, cut by a plane perpendicular to the axial direction. [Figure 4] Figure 3 is a cross-sectional view showing the rotor. [Figure 5] Figure 3 is a cross-sectional view showing the stator. [Modes for carrying out the invention]

[0009] Embodiment 1. Figure 1 is a perspective view showing an eddy current brake device according to Embodiment 1. The eddy current brake device according to Embodiment 1 is used, for example, as an aircraft brake device. The eddy current brake device according to Embodiment 1 comprises a rotor 1 and a stator 2. The eddy current brake device according to Embodiment 1 is a non-contact type brake device in which the rotor 1 and the stator 2 do not come into contact with each other.

[0010] Rotor 1 rotates around a rotation axis (not shown). The direction along the axis of rotor 1 is defined as the axial direction D1. The direction along the radius of the circle centered on the axis of rotor 1 in a plane perpendicular to the axis of rotor 1 is defined as the radial direction D2. The direction along the circumference of the circle centered on the axis of rotor 1 in a plane perpendicular to the axis of rotor 1 is defined as the circumferential direction D3.

[0011] Figure 2 shows a cross-section of the eddy current brake device of Figure 1, cut along planes aligned with the axial direction D1 and the radial direction D2. Figure 3 shows a cross-section of the eddy current brake device of Figure 1, cut along a plane perpendicular to the axial direction D1. Figure 4 is a cross-sectional view showing the rotor 1 of Figure 3. Figure 5 is a cross-sectional view showing the stator 2 of Figure 3. The rotor 1 is rotatably mounted to the stator 2 via a pair of bearings 3.

[0012] The rotor 1 includes a rotor cylindrical portion 101, a rotor disc portion 102, a first brake portion 103, a second brake portion 104, a third brake portion 105, and a fourth brake portion 106.

[0013] The rotor cylindrical portion 101 is formed in a cylindrical shape. The rotor cylindrical portion 101 is positioned so that its circumferential direction coincides with the circumferential direction D3. The outer rings of each of the pair of bearings 3 are attached to the inner circumferential surface of the rotor cylindrical portion 101.

[0014] The rotor disc portion 102 is formed in a disc shape. The rotor disc portion 102 is arranged along a plane perpendicular to the axial direction D1. The rotor disc portion 102 is fixed to the rotor cylindrical portion 101. The rotor disc portion 102 protrudes outward in the radial direction D2 from the rotor cylindrical portion 101.

[0015] The first brake portion 103 is formed in a ring shape. The first brake portion 103 is arranged such that the circumferential direction of the first brake portion 103 coincides with the circumferential direction D3. The first brake portion 103 is fixed to the rotor disc portion 102.

[0016] The second brake portion 104 is formed in a ring shape. The second brake portion 104 is arranged such that the circumferential direction of the second brake portion 104 coincides with the circumferential direction D3. The second brake portion 104 is arranged concentrically with the first brake portion 103. Therefore, the first brake portion 103 and the second brake portion 104 overlap each other in the radial direction D2. The second brake portion 104 is arranged outside the first brake portion 103 in the radial direction D2. The second brake portion 104 is fixed to the rotor disc portion 102.

[0017] The third brake portion 105 is formed in a ring shape. The third brake portion 105 is arranged such that the circumferential direction of the third brake portion 105 coincides with the circumferential direction D3. The third brake portion 105 is arranged concentrically with the first brake portion 103 and the second brake portion 104. Therefore, the first brake portion 103, the second brake portion 104, and the third brake portion 105 overlap each other in the radial direction D2. The third brake portion 105 is arranged outside the second brake portion 104 in the radial direction D2. The third brake portion 105 is fixed to the rotor disc portion 102.

[0018] The fourth brake part 106 is formed in a ring shape. The fourth brake part 106 is arranged such that the circumferential direction of the fourth brake part 106 coincides with the circumferential direction D3. The fourth brake part 106 is arranged concentrically with the third brake part 105. Therefore, the third brake part 105 and the fourth brake part 106 overlap each other in the radial direction D2. The fourth brake part 106 is arranged outside the third brake part 105 in the radial direction D2. The fourth brake part 106 is fixed to the rotor disk part 102.

[0019] The stator 2 includes a stator cylindrical part 201, a stator disk part 202, a plurality of first coils 203, and a plurality of second coils 204.

[0020] The stator cylindrical part 201 is formed in a cylindrical shape. The stator cylindrical part 201 is arranged such that the circumferential direction of the stator cylindrical part 201 coincides with the circumferential direction D3. The stator cylindrical part 201 is arranged inside the rotor cylindrical part 101 in the radial direction D2. The stator cylindrical part 201 is arranged to face the rotor cylindrical part 101 in the radial direction D2. The inner ring of each of the pair of bearings 3 is attached to the outer peripheral surface of the stator cylindrical part 201.

[0021] The stator disk part 202 is formed in a disk shape. The stator disk part 202 is arranged along a plane perpendicular to the axial direction D1. The stator disk part 202 is arranged to face the rotor disk part 102 in the axial direction D1. The stator disk part 202 is fixed to the stator cylindrical part 201. The stator disk part 202 protrudes outward in the radial direction D2 from the stator cylindrical part 201.

[0022] Each of the multiple first coils 203 is positioned adjacent to the first brake section 103 and the second brake section 104 in the radial direction D2. Each of the multiple first coils 203 is positioned between the first brake section 103 and the second brake section 104 in the radial direction D2. The multiple first coils 203 are arranged one by one along the circumferential direction D3. The multiple first coils 203 are arranged in a ring along the circumferential direction D3. In other words, the multiple first coils 203 are arranged in a ring along the entire circumferential direction D3. Each of the multiple first coils 203 is attached to the stator disc section 202 via a mounting member.

[0023] Each of the multiple first coils 203 is supplied with either a direct current or an alternating current from a power supply (not shown). The supply of current to each of the multiple first coils 203 generates a magnetic field in each of them.

[0024] Each of the multiple first coils 203 is arranged such that the direction of the magnetic field it generates is along the radial direction D2. Each of the multiple first coils 203 is arranged such that the direction of the magnetic flux generated in each pair of adjacent first coils 203 in the circumferential direction D3 is different from that of the other.

[0025] Each of the multiple second coils 204 is positioned adjacent to the third brake section 105 and the fourth brake section 106 in the radial direction D2. Each of the multiple second coils 204 is positioned between the third brake section 105 and the fourth brake section 106 in the radial direction D2. Therefore, the multiple second coils 204 are positioned outside the multiple first coils 203 in the radial direction D2. The multiple second coils 204 are arranged one by one along the circumferential direction D3. The multiple second coils 204 are arranged in a ring along the circumferential direction D3. In other words, the multiple second coils 204 are arranged along the entire circumferential direction D3. Each of the multiple second coils 204 is attached to the stator disc section 202 via a mounting member.

[0026] Each of the multiple second coils 204 is supplied with either a direct current or an alternating current from a power supply (not shown). The supply of current to each of the multiple second coils 204 generates a magnetic field in each of them.

[0027] Each of the multiple second coils 204 is arranged such that the direction of the magnetic field it generates is along the radial direction D2. Each of the multiple second coils 204 is arranged such that the direction of the magnetic field generated in each pair of adjacent second coils 204 in the circumferential direction D3 is different from that of the other.

[0028] The number of first coils 203 and the number of second coils 204 are equal. Multiple first coils 203 are arranged so that they are adjacent to each of the multiple second coils 204 in the radial direction D2, one to each. Multiple first coils 203 and multiple second coils 204 are arranged so that the direction of the magnetic field generated in each of the radially adjacent first coils 203 and second coils 204 is equal to that of the other.

[0029] Next, the operation of the eddy current brake device according to Embodiment 1 will be described. When braking the rotor 1 which is rotating in the circumferential direction D3 relative to the stator 2, current is supplied to each of the multiple first coils 203 and current is supplied to each of the multiple second coils 204.

[0030] When current is supplied to each of the multiple first coils 203, a magnetic field is generated in each of the multiple first coils 203. As a result of the magnetic field being generated in each of the multiple first coils 203, a magnetic flux along the radial direction D2 passes through each of the first brake section 103 and the second brake section 104.

[0031] When a magnetic flux along the radial direction D2 passes through the first brake section 103 and the second brake section 104, eddy currents are generated in each of them. The generation of eddy currents in the first brake section 103 and the second brake section 104 causes the rotor 1 to be braked.

[0032] When current is supplied to each of the multiple second coils 204, a magnetic field is generated in each of the multiple second coils 204. As a result of the magnetic field being generated in each of the multiple second coils 204, a magnetic flux along the radial direction D2 passes through each of the third brake section 105 and the fourth brake section 106.

[0033] When a magnetic flux along the radial direction D2 passes through the third brake section 105 and the fourth brake section 106, eddy currents are generated in each of them. The generation of eddy currents in the third brake section 105 and the fourth brake section 106 causes the rotor 1 to be braked.

[0034] As described above, the eddy current brake device according to Embodiment 1 comprises a rotatable rotor 1 and a stator 2 that generates eddy currents in the rotor 1 to brake the rotor 1. The rotor 1 has a ring-shaped first brake portion 103. The first brake portion 103 is arranged such that its circumferential direction coincides with the circumferential direction D3. The stator 2 has a plurality of first coils 203 arranged adjacent to the first brake portion 103 in the radial direction D2. The plurality of first coils 203 are arranged in a line along the circumferential direction D3. By supplying current to each of the plurality of first coils 203, eddy currents are generated in the first brake portion 103, and the rotor 1 is braked. With this configuration, each of the plurality of first coils 203 is arranged adjacent to the first brake portion 103 in the radial direction D2. This makes it possible to increase the braking force on the rotor 1 by increasing the axial direction D1 of each of the plurality of first coils 203. Therefore, it is possible to suppress the increase in the size of the eddy current brake device in the radial direction D2 and to increase the braking force applied to the rotor 1.

[0035] Furthermore, in the eddy current brake device according to Embodiment 1, the rotor 1 has a second brake section 104 formed in the shape of a ring. The second brake section 104 is arranged concentrically with the first brake section 103. A plurality of first coils 203 are arranged between the first brake section 103 and the second brake section 104 in the radial direction D2. By supplying current to each of the plurality of first coils 203, eddy currents are generated in each of the first brake section 103 and the second brake section 104, thereby braking the rotor 1. With this configuration, each of the plurality of first coils 203 is arranged between the first brake section 103 and the second brake section 104 in the radial direction D2. As a result, the magnetic field generated in each of the plurality of first coils 203 can generate eddy currents in each of the first brake section 103 and the second brake section 104. As a result, the braking force on the rotor 1 can be increased.

[0036] Furthermore, in the eddy current brake device according to Embodiment 1, the multiple first coils 203 are arranged in a ring shape along the circumferential direction D3. With this configuration, by supplying current to each of the multiple first coils 203, eddy currents can be generated throughout the entire area of ​​the first brake section 103 in the circumferential direction D3. As a result, the braking force on the rotor 1 can be increased. Also, by supplying current to each of the multiple first coils 203, eddy currents can be generated throughout the entire area of ​​the second brake section 104 in the circumferential direction D3. As a result, the braking force on the rotor 1 can be increased.

[0037] Furthermore, in the eddy current brake device according to Embodiment 1, the rotor 1 has a ring-shaped third brake section 105. The third brake section 105 is arranged such that its circumferential direction coincides with the circumferential direction D3. The stator 2 has a plurality of second coils 204 arranged adjacent to the third brake section 105 in the radial direction D2. The plurality of second coils 204 are arranged in a line along the circumferential direction D3. By supplying current to each of the plurality of second coils 204, eddy currents are generated in the third brake section 105, and the rotor 1 is braked. With this configuration, each of the plurality of second coils 204 is arranged adjacent to the third brake section 105 in the radial direction D2. This makes it possible to increase the axial force D1 of each of the plurality of second coils 204 to increase the braking force on the rotor 1. Therefore, it is possible to suppress the enlargement of the eddy current brake device in the radial direction D2 and increase the braking force on the rotor 1. Furthermore, the rotor 1 is braked by supplying current to each of the multiple first coils 203 and to each of the multiple second coils 204. This increases the braking force applied to the rotor 1.

[0038] Furthermore, in the eddy current brake device according to Embodiment 1, the rotor 1 has a fourth brake section 106 formed in the shape of a ring. The fourth brake section 106 is arranged concentrically with the third brake section 105. Multiple second coils 204 are arranged between the third brake section 105 and the fourth brake section 106 in the radial direction D2. By supplying current to each of the multiple second coils 204, eddy currents are generated in the third brake section 105 and the fourth brake section 106, respectively, and the rotor 1 is braked. With this configuration, each of the multiple second coils 204 is arranged between the third brake section 105 and the fourth brake section 106 in the radial direction D2. As a result, the magnetic field generated in each of the multiple second coils 204 can generate eddy currents in the third brake section 105 and the fourth brake section 106, respectively. As a result, the braking force on the rotor 1 can be increased.

[0039] Furthermore, in the eddy current brake device according to Embodiment 1, the multiple second coils 204 are arranged in a ring shape along the circumferential direction D3. With this configuration, by supplying current to each of the multiple second coils 204, eddy currents can be generated throughout the entire area of ​​the third brake section 105 in the circumferential direction D3. As a result, the braking force on the rotor 1 can be increased. Also, by supplying current to each of the multiple second coils 204, eddy currents can be generated throughout the entire area of ​​the fourth brake section 106 in the circumferential direction D3. As a result, the braking force on the rotor 1 can be increased.

[0040] Furthermore, in the eddy current brake device according to Embodiment 1, the third brake section 105 is arranged concentrically with the first brake section 103. With this configuration, the position of the first brake section 103 in the axial direction D1 and the position of the third brake section 105 in the axial direction D1 can be made to coincide with each other. As a result, the eddy current brake device can be made smaller in the axial direction D1.

[0041] In the eddy current brake device according to Embodiment 1, a configuration was described in which the rotor 1 includes a first brake section 103, a second brake section 104, a third brake section 105, and a fourth brake section 106. However, it is sufficient for the rotor 1 to have at least the first brake section 103 among the first brake section 103, second brake section 104, third brake section 105, and fourth brake section 106. If the rotor 1 does not have both the third brake section 105 and the fourth brake section 106, the stator 2 does not need to have a plurality of second coils 204.

[0042] Furthermore, in the eddy current brake device according to Embodiment 1, a configuration was described in which the stator 2 has a plurality of first coils 203 and a plurality of second coils 204. However, it is sufficient for the stator 2 to have at least a plurality of first coils 203 among the plurality of first coils 203 and a plurality of second coils 204. If the stator 2 does not have a plurality of second coils 204, the rotor 1 does not need to have a third brake section 105 and a fourth brake section 106.

[0043] Furthermore, in the eddy current brake device according to Embodiment 1, a configuration was described in which a plurality of first coils 203 are arranged one by one along the circumferential direction D3. However, a configuration in which a plurality of first coils 203 are arranged in a plurality of axial rows D1 along the circumferential direction D3 is also possible. In this case, the plurality of first coils 203 are arranged along both the axial direction D1 and the circumferential direction D3. In the configuration in which a plurality of first coils 203 are arranged in a plurality of axial rows D1 along the circumferential direction D3, the number of first coils 203 can be increased. This makes it possible to increase the braking force applied to the rotor 1.

[0044] Furthermore, in the eddy current brake device according to Embodiment 1, a configuration was described in which a plurality of second coils 204 are arranged one by one along the circumferential direction D3. However, a configuration in which a plurality of second coils 204 are arranged in a plurality of axial rows D1 along the circumferential direction D3 is also possible. In this case, the plurality of second coils 204 are arranged along both the axial direction D1 and the circumferential direction D3. In the configuration in which a plurality of second coils 204 are arranged in a plurality of axial rows D1 along the circumferential direction D3, the number of second coils 204 can be increased. This makes it possible to increase the braking force applied to the rotor 1.

[0045] Furthermore, in the eddy current brake device according to Embodiment 1, a configuration was described in which a plurality of first coils 203 are arranged in a ring shape along the circumferential direction D3. However, a configuration in which a plurality of first coils 203 are arranged in an arc shape along the circumferential direction D3 is also possible. In other words, a configuration in which a plurality of first coils 203 are arranged along the circumferential direction D3 in only a part of the region of the circumferential direction D3 is also possible. In this case, the number of first coils 203 can be reduced.

[0046] Furthermore, in the eddy current brake device according to Embodiment 1, a configuration was described in which a plurality of second coils 204 are arranged in a ring shape along the circumferential direction D3. However, a configuration in which a plurality of second coils 204 are arranged in an arc shape along the circumferential direction D3 is also possible. In other words, a configuration in which a plurality of second coils 204 are arranged along the circumferential direction D3 in only a part of the region of the circumferential direction D3 is also possible. In this case, the number of second coils 204 can be reduced.

[0047] Furthermore, in the eddy current brake device according to Embodiment 1, a configuration was described in which the third brake section 105 is arranged concentrically with the first brake section 103. However, the third brake section 105 may also be arranged offset from the first brake section 103 in the axial direction D1.

[0048] Although a preferred embodiment 1 of the eddy current brake device has been described above, the invention is not limited to the eddy current brake device according to embodiment 1 described above. Various modifications and transformations can be made to the eddy current brake device according to embodiment 1 described above without departing from the scope of the claims. [Explanation of Symbols]

[0049] 1 Rotor, 2 Stator, 3 Bearing, 101 Rotor cylindrical section, 102 Rotor disc section, 103 First brake section, 104 Second brake section, 105 Third brake section, 106 Fourth brake section, 201 Stator cylindrical section, 202 Stator disc section, 203 First coil, 204 Second coil.

Claims

1. A rotatable rotor (1), A stator (2) that generates eddy currents in the rotor (1) to brake the rotor (1), Equipped with, The rotor (1) has a first brake portion (103) formed in the shape of a ring, The first brake unit (103) is arranged such that the circumferential direction of the first brake unit (103) coincides with the circumferential direction of the rotor (1). The stator (2) has a plurality of first coils (203) arranged adjacent to the first brake portion (103) in the radial direction of the rotor (1), The plurality of first coils (203) are arranged in a line along the circumferential direction of the rotor (1), When current is supplied to each of the plurality of first coils (203), eddy currents are generated in the first brake unit (103), and the rotor (1) is braked. The rotor (1) has a third brake portion (105) formed in the shape of a ring, The third brake portion (105) is arranged such that the circumferential direction of the third brake portion (105) coincides with the circumferential direction of the rotor (1). The stator (2) has a plurality of second coils (204) arranged adjacent to the third brake portion (105) in the radial direction of the rotor (1), The plurality of second coils (204) are arranged in a line along the circumferential direction of the rotor (1), When current is supplied to each of the plurality of second coils (204), eddy currents are generated in the third brake section (105), and the rotor (1) is braked. The number of the plurality of first coils (203) and the number of the plurality of second coils (204) are the same, Each of the plurality of first coils (203) and each of the plurality of second coils (204) are adjacent to each other in the radial direction of the rotor (1), and the directions of the magnetic fields generated in the adjacent first coils (203) and second coils (204) coincide with each other. An eddy current brake device in which current is supplied to the plurality of first coils (203) and to the plurality of second coils (204).

2. The rotor (1) has a second brake portion (104) formed in the shape of a ring, The second brake unit (104) is arranged concentrically with the first brake unit (103), The plurality of first coils (203) are arranged between the first brake section (103) and the second brake section (104) in the radial direction of the rotor (1). The eddy current brake device according to claim 1, wherein current is supplied to each of the plurality of first coils (203), thereby generating eddy currents in each of the first brake section (103) and the second brake section (104), and braking the rotor (1).

3. The eddy current brake device according to claim 1 or claim 2, wherein the plurality of first coils (203) are arranged in a ring shape along the circumferential direction of the rotor (1).

4. The rotor (1) has a fourth brake portion (106) formed in the shape of a ring, The fourth brake unit (106) is arranged concentrically with the third brake unit (105), The plurality of second coils (204) are arranged between the third brake section (105) and the fourth brake section (106) in the radial direction of the rotor (1). The eddy current brake device according to claim 1 or claim 2, wherein current is supplied to each of the plurality of second coils (204) to generate eddy currents in each of the third brake section (105) and the fourth brake section (106), thereby braking the rotor (1).

5. The eddy current brake device according to claim 1 or claim 2, wherein the plurality of second coils (204) are arranged in a ring shape along the circumferential direction of the rotor (1).

6. The eddy current brake device according to claim 1 or claim 2, wherein the third brake unit (105) is arranged concentrically with the first brake unit (103).

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