WO2011158382A1

WO2011158382A1 - Magnetic shaft bearing assembly and system incorporating same

Info

Publication number: WO2011158382A1
Application number: PCT/JP2010/060591
Authority: WO
Inventors: 池田一博
Original assignee: Ikeda Kazuhiro
Priority date: 2010-06-16
Filing date: 2010-06-16
Publication date: 2011-12-22
Also published as: JPWO2011158382A1

Abstract

Disclosed is a magnetic shaft bearing assembly which can provide a strong repulsion in the outward direction of rotation and in the axial direction of rotation and prevents a magnetic shaft from vibrating in the axial direction of rotation. The magnetic shaft bearing assembly includes an integral magnetic shaft (20) which bears magnetism on the entire shaft and is made of a magnetic substance to have the N pole and the S pole appearing on both the end portions; and a magnetic bearing (30) which bears the magnetism of the same pole as that of the opposing end portion (22) of the magnetic shaft (20) to magnetically levitate and rotatably support the magnetic shaft (20) by magnetic repulsion. The end portion (22) of the magnetic shaft (20) is shaped to have an outer circumferential surface in the outer circumferential direction of the axis of rotation and an axial surface in the axial direction of the axis of rotation, with a magnetic pole developed integrally on the outer circumferential surface and the axial surface at the end portion (22). The bearing surface of the magnetic bearing (30) is shaped to have an inner circumferential surface opposed to the outer circumferential surface of the magnetic shaft (20) and an axially opposing surface opposed to the axial surface of the magnetic shaft, with a magnetic pole developed integrally on the inner circumferential surface and the axially opposing surface.

Description

Magnetic shaft bearing device and system incorporating the same

The present invention relates to a bearing that rotatably supports a shaft that can be applied to various fields such as a motor, a generator, an electric vehicle or a hybrid vehicle, an electric motorcycle, a hybrid motorcycle, or a special vehicle, and a system incorporating the same.

In a mechanism with a rotational motion such as a motor, an engine, or a generator, the shaft rotates around a shaft, and the rotational motion of the shaft is supported by a bearing. “Sliding bearings” and “rolling bearings” are widely used as bearings.
A motor is a device that converts electrical energy into kinetic energy.Generally, it supplies electric power to the armature to generate a magnetic field, and rotates by obtaining magnetic attraction and magnetic repulsion obtained between the field and the motor. It is a mechanism that enables continuous rotation by switching the polarity of the armature. Here, there is a bearing component as a mechanism for continuously rotating the shaft of the armature of the motor.
In particular, in recent years, electric vehicles have attracted attention as an alternative to engine vehicles. In electric vehicles, there is a motor as a mechanism for converting electric energy into kinetic energy, and there is a bearing component as a mechanism for continuously rotating the motor shaft.
The basic structure of a generator is the same as that of a motor, but when a shaft connected to a rotor is rotated by an external force to give mechanical rotational drive energy, it is converted into electrical energy in the generator coil, and the electric power is extracted. Is. Here, there is a bearing component as a mechanism for continuously rotating the shaft of the generator.
In this way, bearings exist as an important member in mechanisms that involve rotational movement, such as motors and generators, but conventional sliding bearings and rolling bearings have contact with the shaft, and parts that have been polished to smooth the contacts. Even if it is manufactured, the generation of friction is inevitable, and it is inevitable that the rotational energy is lost and the efficiency is lowered. Moreover, the problem that the shaft contact portion wears out when used for a long time due to friction is unavoidable.
Therefore, an example is known that shows the idea of using a magnetic repulsive force to float and reduce the frictional force of the bearing. An example is shown in FIG.
The example of FIG. 10 is a conventional example applied to a spindle motor. A magnet is arranged on the surface of a rotating body, a magnet is also arranged on the bearing side, and both have the same polarity, thereby generating a repulsive force of magnetic force. This reduces the frictional force by reducing the number of mechanical contacts. In the example of FIG. 10, magnets are arranged in the direction of rotation outward, and no magnetic repulsion is obtained in the direction of the rotation axis. If it rotates on the rotating base like a spindle motor, the movement is mechanically restricted in the direction of the rotation axis, and it can be said that there is no need to consider the control of the magnetic force in the direction of the rotation axis.
JP 09-322474 A

However, the above technique has the following problems.
In Japanese Patent Laid-Open No. 09-322474, the repulsive force of the magnet is orthogonal to the rotation axis direction, so that the force vector has only a component in the rotation outward direction, and the component in the rotation axis direction is zero. Therefore, it is a technique that can be applied only to an object that has a rotating base like a spindle motor and whose movement is mechanically restricted in the direction of the rotation axis. That is, it cannot be applied to a freely rotating shaft.
Next, as disclosed in Japanese Patent Laid-Open No. 05-146109, the first problem is that the repulsive force of the generated magnet is dispersed into the component in the rotation outward direction and the component in the rotation axis direction. There is a problem that it is difficult to obtain a sufficient force for controlling the rotating shaft. Although a load tends to be applied to the shaft in the rotationally outward direction, the magnet mounting angle is adjusted so as to increase the rotationally outward component of the repulsive force of the magnet disclosed in Japanese Patent Laid-Open No. 05-146109. If it goes, conversely, the component of the repulsive force of the magnet in the direction of the rotation axis will suddenly decrease, making it impossible to control the three-dimensional movement. Therefore, the force of the repulsive force of the magnet corresponding to the load as the component of the rotation outward direction has to be adjusted to an angle that can obtain a balanced balance between the component of the magnet repulsion force in the rotation outward direction and the component in the rotation axis direction. There is a problem that cannot be obtained greatly.
Next, the second problem of the technique disclosed in Japanese Patent Laid-Open No. 05-146109 is that it is difficult to adjust the direction of the magnetic force of the magnet to be arranged, and it is difficult to obtain a strong magnetic force. The magnetic force of the magnet can be easily designed if the shape of both ends where the magnetic pole appears is symmetrical, and the direction of the magnetic force can be adjusted. However, if the shape of both ends where the magnetic pole appears is non-symmetric, it is difficult to adjust the direction of the magnetic force. A stable pole is not always formed on a plane with a certain area as shown in FIG. 11, and a pole is likely to be generated at a sharp vertex. In the technique disclosed in Japanese Patent Laid-Open No. 05-146109, a magnet is obliquely attached near the outer ring at the end of the shaft shaft, and a component in the rotationally outward direction and a component in the rotational shaft direction are generated in the repulsive force of the magnet. For this reason, if a ring-shaped magnet is formed in which a wide area plane is obliquely provided in the vicinity of the outer ring at the end of the shaft axis, it is not possible to make a symmetrical shape as both-end shapes where magnetic poles appear. Therefore, it becomes difficult to adjust the direction of the magnetic force of the magnet to be arranged.
Next, the third problem of the technique disclosed in Japanese Patent Application Laid-Open No. 05-146109 is a problem that the vibration phenomenon of the rotating shaft is likely to occur. At both ends of the rotating shaft, the force of pushing the rotating shaft toward the center side is balanced by the repulsive force of the magnets provided at both ends of the rotating shaft, and it is stationary in the direction of the rotating shaft, but the stationary state is on a delicate balance In fact, vibrations occur in the direction of the rotation axis, and the vibrations are not easily cured. If force is applied from one side to the other for some reason, the balance is lost and the rotating shaft moves to one side. For example, when it moves to the left, it is pushed back by receiving a large repulsive force from the bearing magnet at the left end of the rotating shaft and moves to the right, but this time it is pushed back by receiving a large repulsive force from the bearing magnet at the right end of the rotating shaft. Thus, a simple vibration is generated, and a vibration phenomenon of the rotating shaft occurs.
In view of the above problems, the present invention can be applied to a rotating shaft that rotates freely, and can obtain an effective force for both the component in the rotation outward direction and the component in the rotation axis direction. An object is to provide a shaft bearing device. It is another object of the present invention to provide a magnetic shaft bearing device that can be rotated in a stable state while suppressing a vibration phenomenon of a freely rotating rotating shaft.

In order to achieve the above object, the first magnetic shaft bearing device of the present invention is an integral magnetic body in which the entire shaft is magnetized, and N-pole magnetism appears at one end and S-pole magnetism appears at the other end. It is equipped with a magnetic shaft to be the shaft and two bearing parts, each bearing surface has the same magnetism as the end part of the magnetic shaft facing each other, and can rotate while floating the magnetic shaft by the magnetic repulsive force The end of the magnetic shaft having a magnetic pole at both ends of the magnetic shaft, and an outer peripheral surface facing the outer peripheral direction of the rotating shaft and an axial direction facing the axial direction of the rotating shaft A magnetic pole is formed integrally with the outer peripheral surface and the axial surface at each of the end portions, and the shape of the bearing surface of the magnetic bearing is the outer peripheral surface of the magnetic shaft. Opposite A magnetic pole formed on the inner peripheral surface and the axially-facing surface integrally on each of the bearing surfaces, comprising at least two surfaces of an inner peripheral surface and an axially-facing surface facing the axial-direction surface of the magnetic shaft This is a magnetic shaft bearing device.
For example, in a small motor or the like, the magnetic shaft can also be used as a shaft of a rotating body that supports and rotates, and the two bearing portions can also be used as bearings at the end of the shaft of the rotating body. .
Further, the second magnetic shaft bearing device of the present invention is a first magnetic shaft which is an integral magnetic shaft in which the entire shaft is magnetized, and N poles at one end and S poles at the other end appear. The second magnetic shaft, the first magnetic bearing which is a magnetic bearing of an integral magnetic body in which the entire bearing surfaces at both ends are magnetized, and N poles at one end and S poles at the other end appear. A bearing and a third magnetic bearing, wherein the first magnetic shaft is disposed between the first magnetic bearing and the second magnetic bearing, and the second magnetic bearing and the third magnetic bearing. The second magnetic shaft is disposed between the bearings so that the bearing surface has the same magnetism as the opposite end of the magnetic shaft, and the magnetic shaft is levitated by the repulsive force of magnetism. Receiving rotatably, the end of the magnetic shaft The shape includes at least two surfaces of an outer peripheral surface facing the outer peripheral direction of the rotating shaft and an axial surface facing the axial direction of the rotating shaft, and the outer peripheral surface and the axial surface at each end portion Magnetic poles are produced integrally, and the shape of the bearing surface of the magnetic bearing is an inner peripheral surface facing the outer peripheral surface of the magnetic shaft, and an axial facing surface facing the axial surface of the magnetic shaft. A magnetic shaft bearing device comprising at least two surfaces, wherein each of the bearing surfaces has a magnetic pole formed integrally with the inner peripheral surface and the shaft-opposing surface.
In this configuration, the second magnetic bearing, which is one magnetic body, is also used as a magnetic bearing for two magnetic shafts, the first magnetic shaft and the second magnetic shaft.
For example, in a large motor, a super large motor, etc., a plurality of the second magnetic bearings are arranged in series, and the magnetic shaft is disposed between the adjacent second magnetic bearings.
Here, in the above configuration, the tip shape of the end portion at both ends of the magnetic shaft is substantially hemispherical, and the magnetic pole surfaces of the N pole and S pole appearing at the end portion are substantially hemispherical at the end portion. The outer peripheral side magnetic pole surface is a magnetic surface appearing near the substantially hemispherical edge, and the axial direction magnetic pole surface is a magnetic surface appearing near the top of the substantially hemispherical surface. It is characterized by.
In the case of the above structure, magnetic poles are integrally formed on at least two surfaces of the outer peripheral surface facing the outer peripheral direction of the rotary shaft and the axial direction surface. An efficient force can be obtained on any of the components.
Further, in the above configuration, the tip shape of the end portion at both ends of the magnetic shaft is substantially hemispherical, and the magnetic pole surfaces of the N pole and S pole appearing at the end portion are substantially hemispherical at the end portion. Preferably, the outer peripheral surface is a surface in the vicinity of the substantially hemispherical edge, and the axial surface is a surface in the vicinity of the substantially hemispherical apex.
Corresponding to the magnetic shaft, the shape of the bearing surface of the bearing portion of the magnetic bearing is substantially mortar-shaped, and the magnetic surface of the magnetic bearing has the substantially mortar-shaped shape of the bearing portion. It is preferable that it appears on the bearing surface.
Next, the shape of the bearing portion of the magnetic bearing is a substantially mortar shape that is substantially the same as the substantially mortar shape of the bearing surface on the surface of the magnetic shaft opposite to the bearing surface on the axial extension direction side. And having a magnetic surface different from the bearing surface is preferable.
In the bearing portion, if the shape on the back side of the bearing surface is symmetrical with respect to the bearing surface where the magnetic pole appears, the direction of the magnetic force can be easily adjusted and a strong magnetic force can be obtained.
In addition, if the shape of the back side of the bearing surface is made symmetrical, and magnetism is given, in a configuration in which a plurality of magnetic shaft bearing devices are arranged in series, the bearing portion at the boundary of adjacent magnetic shaft bearing devices should be shared. Thus, both surfaces of the common bearing portion can be used as the bearing surfaces of the adjacent bearing portions.
In the above configuration, the magnetic shaft is an integral magnetic body. However, when the shaft body of the magnetic shaft is replaced with a non-magnetic body, the S pole at the end where the N pole appears is the end of the N pole. And the N pole at the end where the S pole appears appears on the back side of the end of the S pole.
Here, in order to link the magnetic shaft with an external mechanical element, an extension shaft made of a non-magnetic material extending in the rotation axis direction with respect to the magnetic shaft is provided, and the extension shaft is provided in the bearing portion of the magnetic bearing. A through hole is provided to guide the outside to the outside, the size and position of the through hole do not touch the extension shaft, and the magnetic shaft and the extension shaft are rotated together.
With the above configuration, the magnetic shaft and an external mechanical element can be linked through the extension shaft.
For example, in the case of a rotating body such as a small motor, the rotating body is incorporated into the entire shaft and the bearing portion of the rotating body, and incorporated into the shaft of the rotating body and the bearings of the rotating bodies at both ends. A structure is also possible. That is, it is a structure in which the magnetic shaft is combined with the original shaft of the rotating body for supporting and rotating, and the two bearing portions are combined with the original bearing at the end of the shaft of the rotating body. Further, for example, in a rotating body such as a large motor, a structure in which the entire magnetic shaft bearing device of the present invention is incorporated in the original bearings at both ends is also possible. That is, two magnetic shaft bearing devices are used and are provided at the positions of the original bearings at one end and the other end extended from the shaft of the rotating body to be supported and rotated. If the motor is a large motor or a super-large motor, a plurality of the magnetic shaft bearing devices are arranged in series, the bearing portions at the boundary of the adjacent magnetic shaft bearing devices are shared, and both surfaces of the common bearing portion are used. It is also possible to use a structure in which each of the adjacent bearing portions is used as the bearing surface.
The magnetic shaft bearing device of the present invention has various uses. For example, the magnetic bearing of the present invention can be incorporated in various vehicles such as automobile tires such as passenger cars, trucks, and buses, motorcycles such as motorcycles, and special vehicles. It can also be applied as a bearing device for a power generation turbine of a hydroelectric power plant or a thermal power plant.

FIG. 1 is a diagram simply showing a basic configuration of a magnetic shaft bearing device 100 according to a first embodiment.
FIG. 2 is a diagram showing the internal structure of the magnetic shaft bearing device 100 according to the first embodiment of FIG. 1 and the magnetism of each component.
FIG. 3 shows a vertical magnetic repulsive force F1 obtained between the outer peripheral side magnetic pole surface of the end 22a of the magnetic shaft 20 and the inner peripheral side magnetic pole surface of the bearing surface 32a of the magnetic bearing 30, and the magnetic shaft 20 4 is a diagram showing a horizontal magnetic repulsive force F2 obtained between the axial magnetic pole surface of the end 22a and the axially opposed magnetic pole of the bearing surface 32a of the magnetic bearing 30. FIG.
FIG. 4 is a diagram showing a configuration in which a plurality of magnetic shaft bearing devices are arranged in series in order to support a large load in a large motor or the like.
FIG. 5 is a diagram showing a configuration in which a plurality of magnetic shaft bearing devices are arranged in series in order to support a large load in an ultra-large motor or the like.
FIG. 6 is a diagram showing an example applied to the electric vehicle 300 and the electric motorcycle 400.
FIG. 7 is a diagram showing an example applied to a bearing of a power generation turbine of a hydroelectric power plant or a thermal power plant.
FIG. 8 is a view showing a conventional example of a bearing applied to a spindle motor.

Hereinafter, the best mode for carrying out the present invention will be specifically described by way of examples. The present invention is not limited to these examples.

Example 1 is a structural example of the magnetic shaft bearing device 100 of the present invention. In Example 1, the magnetic shaft of the magnetic shaft bearing device 100 of the present invention is also used as the shaft of the rotating body 200 for supporting and rotating, and the two bearing portions of the magnetic shaft bearing device 100 of the present invention are provided. These are structural examples that are also used as bearings at both ends of the shaft of the rotating body 200.
FIG. 1 is a diagram schematically illustrating a basic configuration of a magnetic shaft bearing device according to a first embodiment. Of the components of the magnetic shaft bearing device 100, only the portions necessary for explanation are drawn, and the illustration of other structures and parts is omitted. FIG. 1A is a view showing the overall appearance of the motor 200 and the internal structure of the magnetic shaft bearing device 100 in an easy-to-understand manner. FIG. 1B shows the magnetic shaft 20 and the magnetic bearing 30 inside the magnetic shaft bearing device 100. It is the figure which isolate | separated both so that each structure of may be easy to understand. FIG. 2 is a cross-sectional view of only the magnetic shaft bearing device 100 taken out from the motor 200.
Note that any part of the motor 200 other than the magnetic shaft bearing device 100, such as an armature, a field, a commutator, and an electric circuit, can be applied.
As shown in FIG. 1, the magnetic shaft bearing device 100 of the present invention includes a magnetic shaft 20 and a magnetic bearing 30. In addition, it is also preferable to cover and protect the side surface of the magnetic shaft bearing device 100 with a housing. The housing is not particularly limited, but may be a non-magnetic material, for example.
The magnetic shaft 20 includes a shaft portion 21, an end portion 22a, and an end portion 22b. The magnetic shaft 20 is an integral magnetic body having magnetism as a whole, and serves as a rotating shaft. The material may be a magnetic material, but may be a stainless steel material, for example. The extension shaft 40 is further provided in the extending direction of the rotating shaft with respect to the magnetic shaft 20 having magnetism integrally. The extension shaft 40 is a non-magnetic material as will be described later.
When magnetism is applied to the magnetic shaft 20, poles appear at both ends of the magnetic body, that is, at the end 22a and the end 22b. In particular, if the magnetic shaft 20 is symmetrical when viewed from the center, magnetism tends to appear stably. In the shape of the magnetic shaft 20 shown in FIGS. 1 and 2, the end 22 a and the end 22 b at both ends are substantially hemispherical, and are arranged symmetrically with the shaft 21 interposed therebetween. When magnetism is applied to such a magnetic material, stable magnetic poles appear at the

end portions

22a and 22b at both ends.
In this example, the magnetic poles of the magnetic shaft 20 are as shown in FIG. In the example of FIG. 2B, N-pole magnetism appears at one end 22a, and S-pole magnetism appears at the other end 22b.
Next, the magnetic bearing 30 includes two bearing

portions

31a and 31b, and is rotatably received while the magnetic shaft 20 is levitated by a magnetic repulsive force.
The bearing

portions

31a and 31b have the same magnetism as the

end portions

22a and 22b of the magnetic shaft 20 facing the

respective bearing surfaces

32a and 32b. That is, as shown in FIG. 2B, the bearing surface 32a of the bearing portion 31a has an N pole, and the end portion 22a of the magnetic shaft 20 also has an N pole. 22 a floats from the bearing portion 30 a of the magnetic bearing 30. On the other hand, the bearing surface 32b of the bearing portion 31b is the S pole, and the end portion 22b of the magnetic shaft 20 is also the S pole, and both repel each other, so that the end portion 22b of the magnetic shaft 20 extends from the bearing portion 30b of the magnetic bearing 30. Will surface.
Here, by devising the shape of the magnetic surface of the end portion 22 of the magnetic shaft 20 and the magnetic surface 32 of the bearing portion 31 of the magnetic bearing 30, a device for adjusting the vector component of the repulsive force generated between them is incorporated. .
As a device on the magnetic shaft 20 side, as the shapes of the

end portions

22a and 22b where the magnetic poles are generated at both ends of the magnetic shaft 20, the outer peripheral surface facing the outer peripheral direction of the rotating shaft and the axial direction facing the axial direction of the rotating shaft It is a device that has at least two of the surfaces, and that the magnetic poles are formed integrally with the outer peripheral surface and the axial surface.
In this configuration example, the tip shapes of the

end portions

22a and 22b at both ends of the magnetic shaft 20 are substantially hemispherical, and the magnetic pole surfaces of the N and S poles appear on the substantially hemispherical surface. Yes. If the tip shape is substantially hemispherical in this way, a magnetic surface appearing near the edge of the approximately hemispherical surface and a magnetic surface appearing near the top of the approximately hemispherical surface can be obtained as the magnetic surface. The magnetic surface that appears in the vicinity of the rotation portion becomes the outer peripheral side magnetic pole surface that faces the outer side in the rotation direction of the rotating shaft, and the magnetic surface that appears in the vicinity of the substantially hemispherical top portion faces the axial direction side of the rotating shaft. It becomes a surface.
On the other hand, also on the magnetic bearing 30 side, the shape of the bearing surface 32a is provided with at least two surfaces of an inner peripheral surface facing the outer peripheral surface of the magnetic shaft and an axial facing surface facing the axial direction surface of the magnetic shaft. In each of the bearing surfaces 32a, a contrivance is made that a magnetic pole is formed integrally with the inner peripheral surface and the shaft facing surface. An inner peripheral side magnetic pole surface is formed on the inner peripheral surface, and an axially opposed surface side magnetic pole surface is formed on the axially opposed surface.
In this configuration example, as shown in FIGS. 1 and 2, the shape of the bearing surface 32a is substantially mortar-shaped. Thus, when the shape of the bearing surface is substantially hemispherical, a magnetic surface is obtained in which the inner peripheral side magnetic pole surface of the inner peripheral surface and the axially opposed surface side magnetic pole surface of the axially opposed surface are integrated.
3 shows the magnetic repulsive force F1 in the vertical direction obtained between the outer peripheral side magnetic pole surface of the end portion 22a of the magnetic shaft 20 and the inner peripheral side magnetic pole surface of the bearing surface 32a of the magnetic bearing 30, and the end of the magnetic shaft 20 6 is a diagram showing a horizontal magnetic repulsive force F2 obtained between the axial magnetic pole surface of the portion 22a and the axially opposed magnetic pole of the bearing surface 32a of the magnetic bearing 30. FIG. As described above, in the present invention, the magnetic repulsive force generated between the end 22a of the magnetic shaft 20 and the bearing surface 32a of the magnetic bearing 30 is obtained as the vertical force F1 and the horizontal force F2, and the vertical direction, A force that opposes both horizontal directions can be obtained efficiently.
Next, a device on the back side of the bearing portion 31 will be described.
In the structure shown in FIG. 2 (a), in the shape of the bearing portion 31 of the magnetic bearing, the surface 33 on the side of the axial extension direction of the magnetic shaft opposite to the bearing surface 32 is also substantially the same as the mortar shape of the bearing surface 32. The same substantially mortar-shaped shape is provided. The magnetism has a magnetic surface 32 that is different from the bearing surface 32. Thus, by making the surface 33 opposite to the bearing surface 32 substantially the same shape, the bearing portion 31 becomes surface symmetric, and the magnetism appearing on the bearing surface 32 can be strengthened stably. As will be described later, when a plurality of magnetic shaft bearing devices 100 are connected in series in the rotation axis direction, the end of the magnetic shaft 20 is made to correspond to the surface 33 opposite to the bearing surface 32, thereby Can function as a surface.
Next, a transmission mechanism for using the magnetic shaft bearing device 100 of the present invention will be described. In the present invention, the end portion 22 of the magnetic shaft 20 is surrounded in a non-contact manner by the bearing portion 30, and a transmission mechanism may be provided directly to the magnetic shaft 20, but the transmission mechanism is provided to the outside of the bearing portion 30. It is also possible to provide
In the example of FIGS. 1 and 2, a nonmagnetic extension shaft 40 that extends in the direction of the rotation axis of the magnetic shaft 20 is provided, and a through hole that guides the extension shaft 40 to the outside is provided in the bearing portion 31 of the magnetic bearing 30. is there. The size and position of the through hole are not touched to the extension shaft 40, and the magnetic shaft 20 and the extension shaft 40 are rotated together. By providing the extension shaft 40 in this way, it is possible to connect to a mechanical element outside the magnetic bearing 30, and the use of the magnetic shaft bearing device 100 is expanded. Further, since the extension shaft 40 and the magnetic bearing 30 are not in contact with each other, the magnetic shaft 20 can rotate well without loss of kinetic energy in the rotation direction of the magnetic shaft 20.
The above is the basic structure of the magnetic shaft bearing device 100.
The motor 200 can be applied to any part other than the magnetic shaft bearing device 100, such as an armature, a field, a commutator, and an electric circuit.

Next, as a second embodiment, a device when the weight of a rotating body to be supported and rotated such as a large motor or a super large motor is large and a load on the shaft is large will be described.
That is, two magnetic

shaft bearing devices

100A and 100B of the present invention are used, and are respectively provided at one end and the other end extended from the shaft of the rotating body to be supported and rotated, and each of the magnetic

shaft bearing devices

100A and 100B of the present invention. Is an example of a structure applied to the original bearing portion at the end of the shaft of the rotating body.
Here, a plurality of magnetic shaft bearing devices shown in the first embodiment are arranged in series, the bearing portions at the boundary of the adjacent magnetic shaft bearing devices are shared, and both surfaces of the shared bearing portions are adjacent to each other. It is a structural example used as a bearing surface of the bearing portion.
FIG. 4 is a diagram showing an example in which the magnetic

shaft bearing devices

100A and 100B of the present invention are used for the bearing portions at both ends of the large motor 200A, respectively. The internal structure of both the magnetic

shaft bearing devices

100A and 100B has a configuration in which the magnetic shaft bearing devices 100 shown in the first embodiment are arranged in series. Thus, by arranging the magnetic shaft bearing devices 100 in series, a large magnetic repulsive force for levitation can be obtained even if the armature of a motor having a larger weight is used.
Next, FIG. 5 is a diagram showing an example in which the magnetic

shaft bearing devices

100C and 100D of the present invention are used for the bearing portions at both ends of the super large motor 200B, respectively. The internal structure of each of the magnetic

shaft bearing devices

100C and 100D has a configuration in which three magnetic shaft bearing devices 100 shown in the first embodiment are arranged in series.
Here, as shown in FIG. 5, the magnetic shaft bearing device 100A includes the first magnetic shaft 20a and the second magnetic shaft 20b as the magnetic shaft, and the first magnetic bearing 30a and the second magnetic shaft 20b as the bearing portions. The structure has three magnetic bearings 30b and a third magnetic bearing 30c. Here, the center second magnetic bearing 30b has a structure in which the bearing surface at the right end of the magnetic shaft 20a and the bearing surface at the left end of the magnetic shaft 20b are shared. As shown in FIG. 5, when the surface opposite to the bearing surface is formed in substantially the same shape and is given a magnetism opposite to the bearing surface, the magnetic shaft and the magnetic bearing are connected in series as shown in FIG. In this case, both surfaces of the magnetic bearing portion that can be shared can be used as the bearing surfaces of the adjacent magnetic shafts.
Thus, by processing the surface opposite to the bearing surface, it can be used as a bearing surface that receives the end of the adjacent magnetic shaft 20. That is, a plurality of second magnetic bearings 30b may be arranged in series, and a new magnetic shaft 20 may be disposed between the second magnetic bearings 30b. For example, three magnetic shafts 20 and four magnetic shafts are arranged. What has the bearings 30 arranged in series is obtained.

The magnetic shaft bearing device of the present invention has various uses. For example, the magnetic shaft bearing device of the present invention can be applied to shafts of various devices that are driven by a motor. For example, it can be incorporated into shaft bearings of various vehicles such as electric passenger cars driven by motors, electric motorcycles such as motorcycles driven by motors, and special vehicles driven by motors.
As Example 3, examples of a vehicle and a power generation turbine to which the magnetic shaft bearing device of the present invention is applied will be given.
FIG. 6A shows an example applied to the electric vehicle 300. The present invention is not limited to the type of vehicle shown in FIG. 6A, and can be applied to a wide variety of vehicles. In addition, as an electric vehicle, any of an electric vehicle which does not have an internal combustion engine and a hybrid electric vehicle which uses an internal combustion engine together can be applied.
FIG. 6B shows an example in which the magnetic shaft bearing device of the present invention is applied to an electric motorcycle 400 such as a motorcycle. Note that the present invention is not limited to the type of motorcycle shown in FIG. 6B, and can be applied to various types of motorcycle tires.
Although not shown, the magnetic shaft bearing device of the present invention can be applied even to other special vehicles such as heavy machinery.
Moreover, if it is a rotary body with a shaft, the magnetic shaft bearing apparatus of this invention is applicable.
As shown to Fig.7 (a), the magnetic shaft bearing apparatus of this invention is applicable to the bearing part of the power generation turbine of a hydropower station, for example.
Moreover, as shown in FIG.7 (b), the magnetic shaft bearing apparatus of this invention is applicable to the bearing part of the power generation turbine of a thermal power plant, for example.
As mentioned above, although the structural example of the magnetic shaft bearing apparatus concerning Example 2 of this invention was shown, the said structure is an example and a various change is possible.
Although the preferred embodiment of the configuration example of the magnetic shaft bearing device has been illustrated and described above, it will be understood that various modifications can be made without departing from the technical scope of the present invention.

Claims

The entire shaft is magnetized, and is an integral magnetic body with N poles at one end and S poles at the other end.
A magnetic bearing having two bearing portions, each bearing surface having the same magnetism as that of the end portion of the magnetic shaft facing each other, and rotatably receiving the magnetic shaft levitated by a magnetic repulsive force; ,
The shape of the end where magnetic poles are generated at both ends of the magnetic shaft includes at least two surfaces, an outer peripheral surface facing the outer peripheral direction of the rotating shaft and an axial surface facing the axial direction of the rotating shaft. , Magnetic poles are produced integrally with the outer peripheral surface and the axial surface at each of the end portions,
The shape of the bearing surface of the magnetic bearing includes at least two surfaces of an inner peripheral surface facing the outer peripheral surface of the magnetic shaft and an axial facing surface facing the axial surface of the magnetic shaft, A magnetic shaft bearing device, wherein a magnetic pole is formed integrally with the inner peripheral surface and the shaft facing surface on the bearing surface.
The magnetic shaft is also used as a shaft of a rotating body for supporting and rotating, and the two bearing portions are each used as a bearing at an end portion of the shaft of the rotating body. Shaft bearing device.
A first magnetic shaft and a second magnetic shaft which are magnetic shafts of an integral magnetic body in which the entire shaft is magnetized, and magnetism of N pole at one end and S pole at the other end appears;
The first magnetic bearing, the second magnetic bearing, and the third magnetic bearing, which are magnetic bearings of an integral magnetic material in which the entire bearing surfaces at both ends are magnetized, and N poles at one end and S poles at the other end appear. The first magnetic shaft is disposed between the first magnetic bearing and the second magnetic bearing, and the second magnetic bearing is disposed between the second magnetic bearing and the third magnetic bearing. The magnetic shaft is disposed, and the bearing surface is made to be the same magnetism as the end of the opposing magnetic shaft, and is received rotatably while the magnetic shaft is levitated by a magnetic repulsive force,
The shape of the end portion of the magnetic shaft includes at least two surfaces of an outer peripheral surface facing the outer peripheral direction of the rotating shaft and an axial surface facing the axial direction of the rotating shaft. Magnetic poles are produced integrally with the outer peripheral surface and the axial direction surface,
The shape of the bearing surface of the magnetic bearing includes at least two surfaces of an inner peripheral surface facing the outer peripheral surface of the magnetic shaft and an axial facing surface facing the axial surface of the magnetic shaft, A magnetic shaft bearing device, wherein a magnetic pole is formed integrally with the inner peripheral surface and the shaft facing surface on the bearing surface.
4. The second magnetic bearing, which is one magnetic body, is configured to serve as a magnetic bearing for two magnetic shafts of the first magnetic shaft and the second magnetic shaft. The magnetic shaft bearing device described in 1.
The magnetic shaft bearing device according to claim 4, wherein a plurality of the second magnetic bearings are arranged in series, and the magnetic shaft is disposed between the adjacent second magnetic bearings.
The tip shape of the end portion at both ends of the magnetic shaft is substantially hemispherical, and the magnetic pole surfaces of the N pole and S pole appearing at the end portion appear on the substantially hemispherical surface of the end portion. 2. The outer peripheral side magnetic pole surface is a magnetic surface appearing near the substantially hemispherical edge, and the axial direction magnetic pole surface is a magnetic surface appearing near the top of the substantially hemispherical shape. 6. The magnetic shaft bearing device according to any one of items 1 to 5.
The shape of the bearing surface of the bearing portion of the magnetic bearing is substantially mortar-shaped, and in the magnetic bearing, the magnetic surface appears on the bearing surface of the substantially mortar-shaped shape of each of the bearing portions. 7. The magnetic shaft bearing device according to claim 6, wherein
The shape of the bearing portion of the magnetic bearing is a substantially mortar shape substantially the same as the mortar shape of the bearing surface on the surface of the magnetic shaft opposite to the bearing surface on the axial extension direction side. The magnetic shaft bearing device according to claim 7, wherein a magnetic surface different from the bearing surface is formed.
The shaft body of the magnetic shaft is replaced with a non-magnetic material, and the S pole at the end where the N pole appears appears on the back side of the end of the N pole, and the N pole at the end where the S pole appears. The magnetic shaft bearing device according to any one of claims 1 to 8, wherein appears on the back surface of the end portion of the S pole.
The magnetic shaft is provided with a non-magnetic extension shaft extending in the direction of the rotation axis, and the bearing portion of the magnetic bearing is provided with a through hole that leads the extension shaft to the outside. The size and position of the through hole are extended. The magnetic shaft bearing device according to any one of claims 1 to 9, wherein the magnetic shaft and the extension shaft are rotated integrally with each other so as not to touch the shaft.
An electric vehicle incorporating the magnetic shaft bearing device according to any one of claims 1 to 10.
An electric motorcycle incorporating the magnetic shaft bearing device according to any one of claims 1 to 10.
An electric travel special vehicle incorporating the magnetic shaft bearing device according to any one of claims 1 to 10.
A power generation turbine incorporating the magnetic shaft bearing device according to any one of claims 1 to 10.