JPH026223A - Wheel motor using superconductor - Google Patents

Abstract

PURPOSE:To realize a non-contact wheel motor without having bearings by mounting a rotor on the wheel side and a stator on the body side and covering a rotor coil with a superconductor from the outer circumferential side of the rotor to the side surface thereof. CONSTITUTION:A rotor 6 is mounted to a wheel 2 of a wheel with a bolt 8 and a nut 9, and provided with a rotor coil 4 on the outer circumference thereof. A stator 7 has a superconductor 3 covering the rotor coil 4 from the outer circumferential side to the side surface of the rotor 6, and a stator coil 5 is mounted to the inside of said superconductor. By applying a current to the rotor coil 4 in the state where the rotor 6 is in non-contact with the stator 7, a buoyancy is generated between the rotor 6 and the stator 7 to hold a constant gap, and the stator coil 5 undergoes the application of current and control as a propulsion coil to drive a motor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wheel motor that uses a superconductor on the stator side to levitate the rotor and eliminates bearings.

[Conventional technology]

In our daily lives, our dependence on automobiles is increasing. Reflecting this situation, the types of automobiles are becoming more diverse, and their demands are also becoming more diverse. Engine-driven vehicles, which have traditionally been mainstream, have issues such as noise and exhaust gas, especially when traffic volume increases, but electric vehicles, on the other hand,
It has many advantages, such as low noise and no exhaust gas, so it can be adapted to any environmental conditions, and the introduction of a computer allows for flexibility in control. However, although electric vehicles are attracting attention for the future, there are still many issues such as driving power sources and other issues before they can be put into practical use.
Research, development, and proposals regarding electric vehicles are also actively being carried out.

As a driving method for an electric vehicle, there is a method in which a wheel motor is used to drive each wheel independently, and various proposals regarding this wheel motor have already been made.

For example, in Japanese Unexamined Patent Publication No. 62-221853, an outer rotor type motor is mounted inside a wheel, and a segment type magnet and a yoke part are pressed and fixed with springs or screws, thereby improving long-term earthquake resistance, light weight, and compact size. Proposals have been made to improve the Also, JP-A-62-2957
Publication No. 22 proposes that a rotor equipped with a cage-shaped coil is attached to a wheel brake drum, and a stator equipped with a corresponding multiphase winding is attached to the vehicle body to obtain driving force within the wheel. is being done.

[Problem to be solved by the invention]

However, in the conventional wheel motor as described above, a contact member such as a bearing is always interposed between the vehicle body side and the wheel side. Therefore, contact resistance exists due to the bearings, etc., resulting in increased loss and additional power consumption. Furthermore, since vibrations are transmitted from the wheel side to the vehicle body side through contact members such as hair rings, there is a problem in that measures to absorb the vibrations are required in order to improve riding comfort.

Conventional electric vehicles waste electricity as described above and consume a large amount of electricity, so do they include the on-board storage battery? A large-capacity IT source device is also required. the result,
The overall weight of the vehicle also increases, creating a vicious cycle in which energy usage becomes less efficient.

The present invention solves the above problems, and improves the transmission efficiency of driving force by eliminating contact members such as bearings.
The object of the present invention is to provide a wheel motor using a superconductor that can absorb vibrations.

[Means to solve the problem]

To this end, the wheel motor using the superconductor of the present invention is configured such that the rotor is attached to the wheel side, the stake is attached to the vehicle body side, and the stator is covered with the superconductor from the outer circumferential side of the rotor coil to the side. It is characterized by

[Action and effect of the invention]

In the wheel motor using the superconductor of the present invention, the rotor is attached to the wheel side, the stator is attached to the vehicle body side, and the rotor coil is covered with the superconductor from the outer circumference to the side of the rotor. Provides buoyancy between you and your body. Therefore, a non-contact wheel motor without bearings or the like can be realized. Furthermore, since buoyancy is utilized, an electric vehicle with low resistance and vibrations from the wheels is not transmitted to the vehicle body, making it possible to provide a comfortable ride.

〔Example] Examples will be described below with reference to the drawings.

Fig. 1 is a diagram showing the configuration of one embodiment of a wheel motor using a superconductor according to the present invention, Fig. 2 is an enlarged view of a coil portion, and Fig. 3 is a diagram for explaining the action of the superconductor. .

In the figure, ■ indicates a tire, 2 indicates a wheel, 3 indicates a superconductor, 4 indicates a rotor coil, 5 indicates a stator coil, 6 indicates a rotor, 7 indicates a stator, 8 indicates a bolt, and 9 indicates a nut.

In FIG. 1, the rotor 6 is attached to the wheel 2 by a port 8 and a nut 9, and a rotor coil 4 is attached to the outer periphery.
have. The stator 7 has a superconductor 3 that covers the rotor coil 4 from the outer peripheral side to the side surface of the rotor 6, and the stator coil 5 is attached inside the superconductor 3. and,
The stator 7 is attached to the vehicle body side (not shown) and has a space into which, for example, liquid helium is poured for cooling the superconductor 3. In this way, the rotor 6 and stator 7 are made non-contact, and by energizing the rotor coil 4, buoyancy is generated between the rotor 6 and stator 7 to maintain a constant gap, and the stator coil 5 is The motor is driven by controlling the energization as a propulsion coil.

Therefore, although not shown, in order to cool the superconductor 3,
A liquid helium refrigerator is installed on the car body side, and the cooler and stator 7 are connected with cooling piping. Also, a slip ring is provided to supply power to the rotor coil 4, and a battery on the car body side is connected. electrically connect to the source device.

FIG. 2 is an enlarged view of the arrangement of the superconductor 3, rotor coil 4, and stator coil 5. As shown in FIGS. 1 and 2, when the superconductor 3 is used from the outer circumference to the side of the rotor coil 4 to a height that wraps around the rotor coil 4, the vertical and radial directions of the rotor coil 4 are closed by the superconductor 3. Due to the Meissner effect, buoyancy is generated between the rotor 6 and the stator 7, creating a gap. As a result, the rotor 6 can be rotatably supported in a non-contact manner, and at the same time it can also have the effect of a suspension.

That is, according to the Meissner effect, the magnetic lines of force generated by the rotor coil 4 cannot enter the inside of the superconductor 3' as shown in FIG. 3(a). Therefore, if the superconductor 3 is provided to cover the rotor coil 4 in the vertical and radial directions as shown in FIG. . After floating the rotor in this way,
), by attaching the stator coil 5 that couples with this magnetic flux to the stator as a propulsion coil, it is possible to generate propulsive force with high efficiency.

Note that when the rotor coil 4 is not energized, buoyancy cannot be obtained, so it is optional to provide support means between the rotor 6 and the stator 7 in such a state.

FIG. 4 is an exploded view of a wheel motor using the superconductor shown in FIG.
16 is a rotor, +6' is a core material, 17 and 17' are stakes, and 18 is a bolt.

In Fig. 4, the stators 17 and 17' are vertically divided into two parts, and the wheel is attached to the stator 17' on the side.
is provided with a hole for connecting the rotor 16 and the wheel 12. Then, superconductor 13 and stake coil 1
The rotor 16 is assembled by inserting the rotor coil 14 between the stators 17 and 17' from both sides of the rotor 16.

In this state, the core material 16' of the rotor 16 and the bolts 18 can be seen through the holes on the side of the stator 17', so to attach the wheel 12, set the bolts 18 in the holes and tighten the nuts (not shown).
The rotor 16 is connected to the wheel 12 by tightening and fixing. Although not shown, the stator 17 is fixed to the vehicle body as described above.

FIG. 5 is a diagram showing a modified example of the arrangement of the superconductor, the rotor coil, and the stator coil, where 21 is the stator coil, 2
2 is a rotor coil, and 23 is a superconductor.

The example shown in FIG. 5(a) is a configuration example in which the stator coil 21 and rotor coil 22 are arranged side by side, and FIG. 5(b) is a configuration example in which the rotor coil 22 is further retracted from the center. These configurations, like the above embodiments, make it easy to create magnetic flux loops, and in particular, the rotor shape is simpler than the structure shown in Figure 1 of Izutsu, making it easy to manufacture and obtain large buoyancy with a compact structure. can. Furthermore, in the example shown in FIG. 3, the gap can be made large, so the suspension effect is large.

The example shown in (C) is a configuration example in which the rotor coil of the embodiment shown in Fig. 1 is changed by 90 @ and laid horizontally.
d) is an example in which the stator coil is also changed by 90°. With this configuration, a large propulsion force can be obtained.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, a rotor coil made of ordinary copper wire is used, but a permanent magnet may be used, or a superconducting coil may be used together with the stator coil. A structure using such a superconducting coil can be achieved by, for example, spraying liquid helium onto the coil portion,
This is possible by creating a quasi-sealed structure with a seal, and in addition, with the Roke coil, if current is supplied to this superconducting coil at the start of operation, there is no need for a slip ring for current supply as mentioned earlier. . Also,
If a material that achieves a superconducting state at a temperature close to room temperature is used, cooling can be done in a convenient manner without being too powerful. Therefore, the cooling medium is not liquid helium, and other materials may be used as appropriate depending on the degree of cooling.

As is clear from the above description, according to the present invention, a superconductor covering the outer circumferential side of the rotor coil and the side surface thereof is disposed on the stator side, and buoyancy is generated by the Meissner effect, so the rotor is strongly levitated without contact. can be done. Moreover, by providing a sufficient gap, a suspension effect can also be obtained. Therefore, wheel vibration can be absorbed and contact resistance between the stator and rotor can be eliminated. Furthermore, by using superconducting coils, it is possible to generate a large magnetic force with low power consumption and improve operational efficiency. Furthermore, the Meissner effect between the superconductor of the stator and the rotor coil generates buoyancy, making it possible to achieve a configuration without bearings, making it possible to downsize the motor and provide a compact wheel motor. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of one embodiment of a wheel motor using a superconductor according to the present invention, FIG. 2 is an enlarged view of a coil portion, FIG. 3 is a diagram for explaining the action of the superconductor, and FIG. Figure 4 is an exploded view of the wheel motor using the superconductor shown in Figure 1.
FIG. 5 is a diagram showing a modification example of the arrangement of the superconductor, the rotor coil, and the stator coil. l...Tire, 2...Wheel, 3...Superconductor, 4...Rotor coil, 5...Stator coil, 6
...Rotor, 7...Stake, 8...Bolt, 9
...Natsuto. Applicant Aisin AW Co., Ltd. Agent Patent attorney Ryukichi Abe (4 others) Engraved copy of side B (a) (C) (d) Procedural copy (method) Indication of the case 1988 Patent Application No. 155 157 2゜Name of the invention Wheel motor using superconductor 3゜Relationship to the case of person making correction Address Name

Claims (3)

[Claims] (1) A wheel motor using a superconductor, characterized in that the rotor is attached to the wheel side, the stator is attached to the vehicle body side, and the stator is configured to be covered with the superconductor from the outer circumferential side to the side of the rotor coil. . (2) A wheel motor using a superconductor according to claim 1, characterized in that a cooling medium for the superconductor is circulated within the stator and/or through the thickness of the stator and rotor. (3) A wheel motor using a superconductor according to claim 1, wherein superconducting coils are used for the rotor coil and the stator coil.