JP3832379B2 - Compact and lightweight eddy current reducer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk-type, small and lightweight eddy current reduction device for assisting a main brake used in a vehicle such as an automobile. More specifically, the present invention has a simple structure and a simple structure. The present invention relates to an eddy current reduction device having excellent performance.
[0002]
[Prior art]
In braking systems for automobiles such as trucks and buses, in addition to foot brakes, which are the main brakes, exhaust brakes, which are auxiliary brakes, stable deceleration on long downhill slopes, etc. In order to prevent burning, an eddy current reduction device is used.
[0003]
In this eddy current reduction device, a magnet group in which a large number of permanent magnets are arranged in the circumferential direction is moved, and the permanent magnets are brought close to each other so as to face the rotating drum (cylindrical type) or the braking disk. A system for generating braking torque is used.
[0004]
However, in recent years, the demand for eddy current type reduction gears has also diversified, and there is a strong demand for improving the mountability in vehicles so as to reduce the manufacturing cost and enable mounting in small cars. . In order to improve the mountability, it is required to be small and light, and to have a simple structure and excellent economy.
[0005]
In response to the above requirements, it is difficult to reduce the size and weight of an eddy current type reduction gear employing a rotating drum due to its structure. First, regarding heat dissipation during braking, the outer peripheral portion expands when the rotating drum generates heat during braking. To absorb this, a complicated drum support design is required, and the drum structure becomes complicated. Furthermore, since the rotational weight is concentrated on the outer peripheral side in the radial direction, it is difficult to adjust the rotational balance.
[0006]
Furthermore, the adjustment of the air gap, that is, the distance between all the permanent magnets and the drum is adjusted at equal intervals, and the braking torque can be adjusted by increasing or decreasing this interval. However, in order to adjust the air gap, it is necessary to enlarge or reduce the inner diameter of the rotating drum, so that the rotating drum components cannot be sufficiently shared.
[0007]
On the other hand, even when a disk type eddy current reduction device using a braking disk is adopted instead of the drum type using a rotating drum, the method using an electromagnet is not suitable for reducing the size and weight of the device. That is, in this method, current is supplied to the electromagnet provided opposite to the braking disk, eddy current is generated in the braking disk, and braking torque is applied to the rotating shaft. However, a large braking torque is generated. Requires a large number of electromagnets and a device for supplying a large current. For this reason, a space for accommodating a large number of electromagnets is required, and a battery as a current supply source is increased in size, so that the overall configuration of the apparatus is large in capacity and weight.
[0008]
Therefore, in order to reduce the size and weight of the eddy current speed reducer, a disk type speed reducer is employed, and the magnetic pole surface of the permanent magnet is brought close to and opposed to the brake disk to generate a brake torque on the disk itself ( Hereinafter, the “magnet pole face facing method” may be effective. With this method, the magnetic force of the permanent magnet can be applied to the braking disk with a short magnetic path length, so that the magnetic resistance of the magnetic circuit is reduced, the braking efficiency can be improved, and the overall configuration of the apparatus can be simplified. Because.
[0009]
Furthermore, if the “magnet pole face facing method” with this simple structure can be adopted to improve the braking efficiency, a relatively small permanent magnet can be applied as a result, further reducing the size and weight. It becomes easy.
[0010]
1 and 2 are cross-sectional views showing a configuration example of a “magnet pole face facing type” eddy current reduction device using permanent magnets. FIG. 1 shows a device configuration during braking, and FIG. 2 shows a device configuration during non-braking.
[0011]
This eddy current reduction device includes a braking disk 2 made of a ferromagnetic material attached to a rotating shaft 1 and a guide cylinder 3 made of a non-magnetic material arranged on the side of the braking disk 2. The guide tube 3 is supported by a non-rotating portion of a vehicle or the like, and a holding ring 4 made of a ferromagnetic material capable of moving back and forth in a direction perpendicular to the braking surface of the braking disk 2 is housed inside the guide tube 3. The guide tube 3 is provided with a cylinder 5 for moving the holding ring 4 back and forth. On the other hand, a ferromagnetic material (pole piece) 8 is disposed on the end surface of the guide cylinder 3 facing the braking disk.
[0012]
A plurality of permanent magnets 7 are arranged at equal intervals in the circumferential direction on the side surface of the holding ring 4 facing the brake disk 2. The direction of the magnetic pole of the magnet 7 is opposed to the braking surface of the braking disk 2, and the adjacent permanent magnetic poles are arranged in opposite directions. A plurality of ferromagnetic materials 8 facing the magnetic pole surface of each permanent magnet 7 are arranged so as to make a pair with the permanent magnet 7 in the circumferential direction. Although the thickness of the ferromagnetic material 8 is not particularly defined, it is desirable that the thickness is thinner. For example, when the guide tube 3 made of aluminum is cast, the ferromagnetic material can be integrally cast.
[0013]
As a drive mechanism for the permanent magnet 7, a cylinder 5 is disposed on the outer end wall of the guide cylinder 3, and a piston rod 6 fitted to the cylinder 5 passes through the outer end wall of the guide cylinder 3 and is coupled to the holding ring 4. is doing. With this configuration, the holding ring 4 can be moved forward and backward in the direction perpendicular to the brake disk 2 by the operation of the cylinder 5.
[0014]
Next, the operation of the eddy current reduction device will be described. During braking, the piston rod 6 of the cylinder 5 moves to the right as shown by the arrow in FIG. 1, the holding ring advances in the vertical direction with respect to the braking disk 2, and the permanent magnet 7 approaches the braking disk. To do.
[0015]
At this time, when the rotating braking disk 2 traverses the magnetic lines of force exerted by the permanent magnets 7 perpendicularly to the braking surface of the braking disk 2 through the ferromagnetic material 8, eddy currents are generated in the braking disk 2 from changes in the magnetic flux in the braking disk. Flows and braking torque is generated.
[0016]
When switching to non-braking, the operation of the cylinder 5 is switched, and the holding ring 4 directly connected to the piston rod 6 is moved to the left as shown by the arrow in FIG. The magnetic force exerted on the braking disk 2 by the permanent magnet 7 away from the (pole piece) 8 is weak.
[0017]
[Problems to be solved by the invention]
As described above, in the “magnet pole face facing type” eddy current reduction device in which the permanent magnet is arranged to face the brake disk, the holding ring is set in a direction perpendicular to the brake disk during braking, as shown in FIG. The permanent magnet is moved forward so as to approach the braking disk. On the other hand, at the time of non-braking, as shown in FIG. 2, it is necessary to retract the retaining ring and separate the permanent magnet and the braking disk by a predetermined stroke.
[0018]
In the above braking and non-braking operations, the permanent magnet is attracted to the braking disk, which is a ferromagnetic body, during braking, so that the power for advancing the holding ring on which the permanent magnet is disposed in the direction perpendicular to the braking disk. Is rarely needed. On the other hand, when the retaining ring is moved backward in order to separate the permanent magnet from the braking disk during non-braking, it is necessary to overcome the magnetic attraction force with the braking disk, which requires a great deal of power.
[0019]
In particular, in a retarder that requires high braking torque, a magnet with strong magnetic force is used to secure the braking torque, or the magnetic flux acting on the braking disk is increased by increasing the volume of the magnet. Magnetic attraction between the disk and the disk becomes stronger. For this reason, a large amount of power is required to pull the permanent magnet away from the braking disk against this magnetic attractive force and switch to the non-braking state.
[0020]
If the power necessary for switching is to be supplied by a device such as an actuator, it is necessary to increase the required cylinder diameter or increase the number of installations, resulting in a large device and a complicated structure. When these devices are incorporated in an eddy current reduction device, the overall configuration of the device is increased in size and weight, and the mountability on a vehicle is remarkably deteriorated.
[0021]
The present invention has been developed in view of the problems involved in the above-mentioned “magnet pole face facing type” eddy current reduction device using a permanent magnet, and at the time of switching from braking to non-braking. In order to reduce the power required to pull the permanent magnet away from the braking disk, to reduce the size of the actuators, cylinders, and other equipment required for this purpose, and to provide a small, lightweight eddy current reduction device Yes.
[0022]
[Means for Solving the Problems]
The gist of the present invention is the following small and light eddy current reduction devices (1) and (2) .
[0024]
(1) A brake disc attached to the rotating shaft, a guide cylinder supported by a non-rotating portion and disposed on the side of the brake disc, and a movable cylinder that is housed in the guide cylinder and is movable forward and backward. A ring, a plurality of permanent magnets facing the brake disk in the circumferential direction of the holding ring, and adjacent magnetic poles arranged in opposite directions, and an end face of the guide cylinder so as to face the permanent magnet An eddy current reduction device provided with the above-described ferromagnetic material, wherein the permanent magnet is movable so as to face the braking disk, and the holding ring has the following ( 1) A small and lightweight eddy current reduction device characterized in that it can be moved at an angle of ± α satisfying the equation (1).
0 ° <α <90 ° (1)
[0025]
(2) A braking disk attached to the rotating shaft, a guide cylinder supported by a non-rotating portion and disposed on the side of the braking disk, and a movable cylinder that is housed in the guide cylinder and can move forward and backward. A ring, a plurality of permanent magnets facing the brake disk in the circumferential direction of the holding ring, and adjacent magnetic poles arranged in opposite directions, and an end face of the guide cylinder so as to face the permanent magnet An eddy current reduction device that is movable while rotating the permanent magnet facing the braking disk, the amount of movement of the permanent magnet disposed in the holding ring in the rotational axis direction When the angle α is defined by the following equation (3) from L ₁ and the amount of movement L _{2 in the} circumferential direction, the holding ring satisfies the following equation (1) with respect to the rotation axis direction orthogonal to the braking disk. Can be moved at an angle of ± α This is a small and lightweight eddy current reduction device.
[0026]
0 ° <α <90 ° (1)
tanα = L ₂ / L ₁ ... (3)
[0027]
DETAILED DESCRIPTION OF THE INVENTION
A large amount of power is required to pull the permanent magnet vertically away with the magnetic pole surface of the permanent magnet opposed to the braking surface of the braking disk made of a ferromagnetic material. This is because power equivalent to the magnetic attractive force acting between the magnet and the ferromagnetic material is required to simultaneously pull the entire magnetic pole of the permanent magnet away from the ferromagnetic material.
[0028]
However, if the retaining ring is tilted at an angle ± α with respect to the rotation axis direction and the permanent magnet is tilted with respect to the braking surface of the braking disk, the power necessary for pulling off can be obtained by pulling the permanent magnet away from the braking disk. Can be reduced.
[0029]
FIG. 3 is a diagram schematically showing a state in which the holding ring is inclined at an angle ± α with respect to the rotation axis direction. The permanent magnet 7 accommodated in the guide tube 3 is arranged in the circumferential direction of the holding ring 4, and the holding ring 4 holds the permanent magnet 7 in a state where the angle + α or the angle −α is inclined with respect to the rotation axis direction. is doing. The ferromagnetic material 8 disposed on the end face of the guide tube 3 is disposed opposite to the permanent magnet 7.
[0030]
In FIG. 3, the power required to pull the permanent magnet 7 facing the brake disk (not shown) vertically is Fm. On the other hand, when the permanent magnet 7 is separated in the direction of the rotation axis while the holding ring 4 is inclined at the angle α, if the power required for the separation is Fa, the relationship between the two is: Fa = Fm · cos α It becomes. That is, the power Fa required for the separation can be reduced by separating the permanent magnet 7 in the direction of the rotation axis while being inclined with respect to the direction of the rotation axis.
[0031]
At this time, as shown in FIG. 3A, the angle at which the holding ring 4 is tilted with respect to the rotation axis direction is + α in the clockwise direction with respect to the rotation axis direction, and the counterclockwise direction as shown in FIG. If the clockwise direction is −α, it can be seen that the relationship between Fm and Fa is established in any direction. In order to satisfy the condition of Fm <Fa in the eddy current reduction device of the present invention, the angle ± α with which the holding ring 4 is inclined with respect to the rotation axis direction needs to satisfy the following relationship (1).
[0032]
0 ° <α <90 ° (1)
In a state where the holding ring 4 on which the permanent magnet 7 is arranged is held at an angle ± α with respect to the rotation axis direction, the permanent magnet 7 and the ferromagnetic material 8 are opposed to each other, and at the same time, the ferromagnetic material 8 and the brake are braked. It is necessary to face the disc with a small gap. If the gap is not made small, the air gap between the two becomes large and the braking efficiency is remarkably lowered. For this reason, as shown in FIGS. 4 and 5 to be described later, the ferromagnetic material 8 facing the permanent magnet 7 needs to have a cross-sectional shape facing the braking disk 2 at the same time.
[0033]
As described above, in order to improve the braking efficiency of the eddy current reduction device, it is desirable to shorten the distance between the magnetic pole surface of the permanent magnet 7 and the surface of the braking disk 2 as much as possible. Since the cross-sectional shape shown in FIGS. 4 and 5 to be described later is used because it is necessary to configure the cross-sectional shape so as to oppose the brake disk 2 as well, the magnetic circuit exerted by the permanent magnet 7 to the brake disk 2 becomes long, and the magnetic efficiency is deteriorated. . Therefore, as a configuration of the eddy current reduction device, in order to shorten the distance between the magnetic pole surface of the permanent magnet 7 and the surface of the braking disk 2, the surface of the braking disk that faces the ferromagnetic body is opposed to the surface orthogonal to the rotational axis direction. The angle ± β can be inclined.
[0034]
At this time, the angle at which the braking disk surface is tilted with respect to the surface orthogonal to the rotational axis direction is any direction if the clockwise direction is + β and the counterclockwise direction is −β with respect to the orthogonal surface as a reference. However, the distance between the magnetic pole surface of the permanent magnet 7 and the surface of the brake disk 2 can be shortened by combining with the angle α. When the braking disk surface is tilted with respect to the surface orthogonal to the rotation axis direction as a configuration of the eddy current reduction device , the angle ± β needs to satisfy the following relationship (2).
[0035]
0 ° <β <90 ° (2)
As the configuration of the eddy current reduction device , α = β (+ α = + β or −α = −β) in the relationship between the above formulas (1) and (2) is the most permanent magnetic pole surface and braking disk. Since the distance to the surface can be shortened, it is further desirable from the viewpoint of magnetic efficiency.
[0036]
In the above-described device configuration, the holding ring can move in the direction of the rotation axis, but the permanent magnet is held in a state where the angle ± α is inclined with respect to the rotation axis direction and the permanent magnet is inclined with respect to the braking surface of the braking disk. The magnet is pulled away in the direction of the rotation axis. As a result, the relationship between the power Fm required to separate the permanent magnet in the vertical direction and the power Fa required to separate the permanent magnet in the direction of the rotation axis is Fa = Fm · cosα, and the power required to separate the permanent magnet is reduced. Can do.
[0037]
As shown in FIG. 8, which will be described later, when the permanent magnet 7 is held in a state of being perpendicularly opposed to the surface of the brake disk 2 via the ferromagnetic material 8, the holding ring 4 is orthogonal to the surface of the brake disk 2. This can also be achieved by retracting the angle ± α with respect to the direction of the rotation axis.
[0038]
Further, even in the case shown in FIGS. 9 and 10 to be described later, the permanent magnet 7 can be moved while being swung while facing the brake disk 2, and the holding ring 4 can be moved in the rotation axis direction perpendicular to the surface of the brake disk 2. Alternatively, it can be achieved by retracting the angle ± α in the inclined direction. In this case, the angle α is defined by the movement amount L ₂ of the moving amount L ₁ in the circumferential direction of the rotation axis direction of the permanent magnet 7 by the following equation (3).
[0039]
tanα = L ₂ / L ₁ ... (3)
That is, even in the device configuration shown in FIGS. 8 to 10 described later, the permanent magnet 7 is separated by pulling the permanent magnet 7 facing the braking disk 2 in a direction inclined by an angle ± α with respect to the rotation axis direction. The relationship of Fa = Fm · cos α is also established between the power Fm required for separating in the vertical direction and the power Fa required for separating.
[0040]
If the angle α employed in the eddy current reduction device of the present invention is increased, the power required for separation from the braking disk can be reduced, so that the required cylinder diameter can be reduced and the number of installations can be reduced. Become. On the other hand, since the moving distance of the permanent magnet is increased, the guide cylinder that houses the permanent magnet is increased, and the stroke of the cylinder is increased. Therefore, in the present invention, it is necessary to consider the optimization of the angle α to be adopted in consideration of the effect of reducing the separation power and the effect of downsizing the apparatus.
[0041]
【Example】
Below, the specific structure of the eddy current reduction device of this invention is demonstrated based on Reference Examples 1-4 and Examples 5 and 6. FIG. 4 and 5 are diagrams showing a reference configuration example of the present invention in which the permanent magnet is held by the holding ring at an angle ± α with respect to the rotation axis direction.
[0042]
The eddy current reduction devices of Reference Examples 1 and 2 are composed of a braking disk 2 made of a ferromagnetic material and a guide cylinder 3 made of a non-magnetic material, and in the direction of the rotation axis perpendicular to the braking surface of the braking disk 2 The guide ring 3 is provided with a cylinder 5 for moving the holding ring 4 back and forth. Since the holding ring 4 is inclined at an angle α with respect to the rotation axis, the magnetic pole direction of the permanent magnet 7 is in a state where the angle α is inclined with respect to the braking surface of the braking disk 2.
[0043]
A plurality of ferromagnetic materials 8 are arranged so as to make a pair with the permanent magnet 7 in the circumferential direction so as to face the permanent magnet 7. The cross-sectional shape of the ferromagnetic material 8 needs to be configured to have a cross-sectional shape that reduces the gap between the surface facing the permanent magnet 7 and the surface facing the braking disk 2 so that the air gap is minimized. . The cross-sectional shape shown in FIGS. 4 and 5 is configured as a wedge shape or a substantially triangular shape. Normally, the ferromagnetic material having such a cross-sectional shape is cast integrally with the guide tube 3 made of aluminum, for example.
[0044]
The permanent magnet 7 is moved by moving the holding ring 4 in a direction perpendicular to the brake disk 2 by the operation of the cylinder 5, that is, in the rotation axis direction. During braking, little power is required to move the retaining ring 4 forward. At the time of non-braking, the permanent magnet 7 is separated in the direction of the rotation axis with the angle ± α tilted with respect to the braking surface of the braking disk 2, so that the power required for the separation can be reduced.
[0045]
FIG. 4 is a view showing a state in which the permanent magnet 7 is inclined at an angle + α with respect to the braking surface of the braking disk 2, and FIG. 5 is a state in which the permanent magnet 7 is inclined at an angle −α with respect to the braking surface of the braking disk 2. However, in any case, the power required for separation can be reduced.
[0046]
In the eddy current reduction device of Reference Example 3 shown in FIG. 6, in addition to holding the permanent magnet 7 at an angle ± α with respect to the rotation axis direction orthogonal to the braking disk 2, Of these, the surface facing the ferromagnetic body 8 is inclined at an angle ± β with respect to the surface orthogonal to the rotational axis direction. With this configuration, the wedge-shaped or substantially triangular thickness of the ferromagnetic material 8 can be made relatively thin, and the distance between the magnetic pole surface of the permanent magnet 7 and the surface of the braking disk 2 can be shortened. it can.
[0047]
In the eddy current reduction device of Reference Example 4 shown in FIG. 7, in order to minimize the thickness of the ferromagnetic body 8, the angle α for tilting the permanent magnet 7 and the angle β for tilting the brake disk 2 are set to α = β. With this configuration, the distance between the magnetic pole surface of the permanent magnet 7 and the surface of the brake disk 2 can be minimized, so that the magnetic efficiency can be improved.
[0048]
In the eddy current reduction device of the fifth embodiment shown in FIG. 8, a plurality of permanent magnets 7 are arranged in the circumferential direction on the side surface of the holding ring 4 that faces the braking disk 2, and the direction of the magnetic poles of the permanent magnet 7 is It faces the braking surface of the braking disk 2. Further, a plurality of ferromagnetic bodies 8 facing the magnetic pole surfaces of each permanent magnet 7 are arranged so as to make a pair with the permanent magnet 7 in the circumferential direction.
[0049]
On the other hand, the holding ring 4 that holds the permanent magnet 7 is coupled to a piston rod 6 that fits into the cylinder 5 on the outer end wall of the guide cylinder 3. Retreat in a direction inclined by an angle ± α. Therefore, when the retaining ring 4 is moved backward when switching to non-braking, the power for separating the permanent magnet 7 from the braking disk 2 can be reduced.
[0050]
FIG. 9 is a front cross-sectional view illustrating a cross-sectional configuration of the eddy current reduction device according to the sixth embodiment. FIG. 10 is a plan sectional view for explaining a sectional configuration of the eddy current reduction device of the sixth embodiment. In both figures, (a) shows a configuration during braking, and (b) shows a configuration during non-braking.
[0051]
In the eddy current reduction device of the sixth embodiment shown in FIGS. 9 and 10, the permanent magnet 7 can be moved while being turned against the brake disk 2, and the holding ring 4 can be moved with respect to the rotation axis direction perpendicular to the surface of the brake disk 2. The angle ± α is retracted in the inclined direction. Thus, the switching to the non-braking, with the retraction of the retaining ring 4, permanent magnets 7 arranged on the holding ring 4, and at the same time L ₁ moves in the rotation axis direction, to pivot moves by L ₂ in the circumferential direction However, the power required for disconnecting from the braking disk 2 can be reduced.
[0052]
【The invention's effect】
According to the eddy current speed reducer of the present invention, the “magnet pole face facing method” is adopted for the disk type speed reducer, so that the braking efficiency is excellent and the permanent magnet is used when switching from braking to non-braking. The power required for disconnecting the motor from the braking disk is reduced, and the actuators, cylinders, and other devices required for this are reduced in size, making it possible to reduce the size and weight. And since it can be made into a simple structure with a simple structural design, it is excellent also in the mounting property to a vehicle, and economical efficiency.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example during braking of a “magnet pole face facing type” eddy current reduction device using a permanent magnet.
FIG. 2 is a diagram for explaining a configuration example of a “magnet pole face facing type” eddy current reduction device using a permanent magnet at the time of non-braking.
FIG. 3 is a view schematically showing a state in which the holding ring is inclined at an angle ± α with respect to the rotation axis direction.
FIG. 4 is a diagram showing a cross-sectional configuration of an eddy current reduction device of Reference Example 1 of the present invention.
FIG. 5 is a diagram showing a cross-sectional configuration of an eddy current reduction device of Reference Example 2 of the present invention.
FIG. 6 is a diagram showing a cross-sectional configuration of an eddy current reduction device of Reference Example 3 of the present invention.
FIG. 7 is a diagram showing a cross-sectional configuration of an eddy current reduction device of Reference Example 4 of the present invention.
FIG. 8 is a diagram showing a cross-sectional configuration of an eddy current reduction device according to a fifth embodiment of the present invention.
FIG. 9 is a front sectional view showing a sectional configuration of an eddy current reduction device according to a sixth embodiment of the present invention.
FIG. 10 is a plan sectional view showing a sectional configuration of an eddy current reduction device according to a sixth embodiment of the present invention.
[Explanation of symbols]
1: rotating shaft 2: braking disk 3: guide cylinder 4: retaining ring 5: cylinder 6: piston rod 7: permanent magnet 8: ferromagnetic material

Claims (2)

A braking disk attached to the rotating shaft, a guide cylinder supported by a non-rotating part and disposed on the side of the braking disk, a holding ring housed in the guide cylinder and movable forward and backward, A plurality of permanent magnets that are opposed to the brake disk in the circumferential direction of the retaining ring and whose adjacent magnetic poles are arranged in opposite directions, and a strong magnet disposed on the end face of the guide cylinder so as to face the permanent magnet. An eddy current reduction device provided with a magnetic material, wherein the permanent magnet is movable while facing the braking disk, wherein the holding ring is expressed by the following formula (1) with respect to the rotational axis direction perpendicular to the braking disk: A small, lightweight eddy current reduction device that can move at an angle of ± α satisfying
0 ° <α <90 ° (1) A braking disk attached to the rotating shaft, a guide cylinder supported by a non-rotating part and disposed on the side of the braking disk, a holding ring housed in the guide cylinder and movable forward and backward, A plurality of permanent magnets that are opposed to the brake disk in the circumferential direction of the retaining ring and whose adjacent magnetic poles are arranged in opposite directions, and a strong magnet disposed on the end face of the guide cylinder so as to face the permanent magnet. An eddy current reduction device provided with a magnetic material and movable while rotating the permanent magnet facing the braking disk, wherein the permanent magnet disposed on the holding ring has a movement amount L _{1 in} the rotation axis direction. When the angle α is defined by the following expression (3) from the circumferential movement amount L ₂ , the holding ring has an angle ± α that satisfies the following expression (1) with respect to the rotation axis direction orthogonal to the braking disk. Be tiltable and movable A small, lightweight eddy current reduction device characterized by
0 ° <α <90 ° (1)
tan α = L ₂ / L ₁ (3)

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