Shaftless propulsion system

Abstract

To provide a new propulsion device which is safer than a conventional propulsion device and can suppress noise without sacrificing thrust.SOLUTION: A non-shaft propulsion device 1 includes a rotary electric motor including an annular stator 2 and an annular rotor 5. The stator 2 has a stator body 21 and a ring-shaped coil arrangement 23. The stator body 21 has: an annular part 25 having a cavity 3 inside; a suction port 27 formed on an upper surface side of the stator body 21; a bottom part 29 formed with an exhaust port 28; a duct 31 having a sound absorption material; and a honeycomb-shaped cover 33 provided on the suction port 27. The rotor 5 has: a rotor body 51 provided so as to rotate outside the annular part 25 of the stator body; and ring-shaped permanent magnet arrangements 53 and 54. The rotor body 51 supports the permanent magnet arrangements 53 and 54, and has a fan 65 for thrust generation and a fan 66 for cooling.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a shaftless propulsion device, in particular a propulsion device including a rotary electric motor having a stator and a rotor, and also to an unmanned aerial vehicle or a manned aerial vehicle equipped with a shaftless propulsion device. [Background technology]

[0002] In recent years, there has been active development of manned aircraft and unmanned aircraft (drones) that use electric motors as a power source. Conventional aircraft that use electric motors use a propeller (multiple long blades) connected to the motor shaft, which is the output shaft of the motor, as a propulsion device. The propeller connected to the motor shaft is rotated at high speed by the electric motor to generate the thrust required for flight.

[0003] However, in conventional propulsion devices in which a propeller is connected to a motor shaft, the rotation of the propeller, which is made up of multiple long blades, inevitably generates loud noise. Although the noise can be suppressed by reducing the rotation speed of the propeller, doing so makes it difficult to obtain the necessary thrust. Therefore, in order to further popularize manned and unmanned aircraft using electric motors, it is necessary to suppress the noise generated by the propulsion device without sacrificing thrust.

[0004] In addition, in conventional propulsion devices with a structure in which a propeller is connected to a motor shaft, the larger the diameter of the propeller, the greater the thrust, but at the same time, the greater the danger. Conversely, if the propeller diameter is shortened from a safety standpoint, there is a problem that the necessary thrust cannot be obtained. Therefore, improving the safety of propulsion devices is also an issue for further popularization of manned and unmanned aircraft using electric motors. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above-mentioned problems, an object of the present invention is to provide a new propulsion system and an aircraft using the same that are safer than conventional propulsion systems and can suppress noise without sacrificing thrust. [Means for solving the problem]

[0006] Such an object is to provide a shaftless propulsion device comprising a rotary electric motor having an annular stator and an annular rotor, The stator is a stator body having an annular portion with an internal cavity; a ring-shaped coil arrangement provided on the stator body; The rotor is a rotor body arranged to rotate outside the annular portion of the stator body; a ring-shaped permanent magnet arrangement provided on the rotor body; and a fan for generating thrust provided on the rotor body. This is achieved by the shaftless propulsion device, which is characterized by the above.

[0007] In the shaftless propulsion device, a fan for generating thrust is provided in the rotor body so as to surround the cavity of the stator body.

[0008] In the shaftless propulsion device described above, it is preferable that the rotor further includes a cooling fan.

[0009] In the shaftless propulsion device, the stator is formed to encase the rotor, and the rotor is rotatably provided inside the stator (in the internal space of the encasing stator).

[0010] In the shaftless propulsion device, the stator may be provided with a sound absorbing material (noise suppression member) for absorbing noise generated by rotation of the rotor.

[0011] In the shaftless propulsion device, the stator has an intake port on the top surface for drawing air into the interior, and an exhaust port on the bottom surface for exhausting air from the interior.

[0012] In the shaftless propulsion device, the stator may have a jet control member for controlling the direction of the jet to enhance the propulsive force.

[0013] In the above shaftless propulsion device, the stator desirably has an intrusion prevention means for preventing the intrusion of a human body or an obstacle into the interior.

[0014] In the shaftless propulsion device, the permanent magnet arrangement provided on the rotor body is for example, A first permanent magnet array composed of a plurality of permanent magnets in a Halbach array located inside the coil array of the stator body; a second permanent magnet array positioned outside the coil array of the stator body and configured with a plurality of permanent magnets in a Halbach array; The present invention is configured to include the following.

[0015] In the shaftless propulsion device, the permanent magnet arrangement provided on the rotor body is For example, it may be composed of multiple permanent magnets in a Halbach array positioned outside or inside the coil arrangement of the stator body.

[0016] The above-mentioned object is also achieved by an aircraft (including manned aircraft and unmanned aircraft such as drones) having the above-mentioned shaftless propulsion device.

[0017] The differences between a typical magnet arrangement in which the north and south poles are arranged side by side and the Halbach array described above are as follows:

[0018] Figure 15 shows the magnetic flux lines of a typical magnet array in which the north and south poles are arranged next to each other, and a Halbach array in which permanent magnets with a rectangular cross section are arranged in a row while being rotated by 90° each time. Note that while the magnetic poles of the permanent magnets are rotated by 90° each time in Figure 15(b), in a Halbach array, they may be rotated by an angle obtained by dividing 360° by an integer of 3 or more to match the required pole pitch and thickness of the permanent magnets.

[0019] In the NS array shown in Figure 15(a), the magnetic flux lines are evenly distributed above and below the magnet row, whereas in the Halbach array shown in Figure 15(b), the magnetic flux lines are concentrated on one side of the magnet row.

[0020] Taking advantage of this property, if the Halbach array in Figure 15(b) is arranged in two rows as shown in Figure 16, the magnetic flux lines are concentrated in the air gap between the Halbach arrays, and almost no magnetic flux lines are visible outside the Halbach array. If the same amount of magnets is used, the magnetic flux density in the gap will be almost doubled. If an armature coil is placed in this gap, a strong magnetic field can be linked to the coil, resulting in the same torque as a motor that uses iron for the armature. A field magnet configured as shown in Figure 16 is called a dual Halbach array field magnet.

[0021] Although a linear dual Halbach array field magnet is shown as an example in Fig. 16, in order to use it in a rotary motor, it is necessary to roll the permanent magnet array into a ring shape. Even if a linear dual Halbach array field magnet is rolled into a ring shape, it is possible to obtain torque and output equivalent to that of the linear type. Effect of the Invention

[0022] The present invention is a shaftless propulsion device. In the conventional technology, a propeller is attached to the motor shaft, but in the present invention, the part where the motor shaft was in the conventional technology is hollowed out, and the rotor is provided with a fan for generating thrust. This makes it possible to suppress the noise generated by the propulsion device without sacrificing thrust.

[0023] In addition, in the present invention, the area (where the motor shaft was in the conventional technology) is made hollow, and a rotor with a fan for generating thrust rotates around it, making it possible to improve the safety of the propulsion device compared to conventional technologies that use propellers (multiple long blades).

[0024] In addition, in the present invention, the rotor is provided with a cooling fan in addition to the thrust generating fan, which makes it possible to efficiently cool the rotary motor while the propulsion device is in operation.

[0025] In addition, in the present invention, the permanent magnet array provided on the rotor body is composed of multiple permanent magnets in a Halbach array, for example. This makes it possible to configure an ultra-high efficiency motor required for the propulsion device of an unmanned aerial vehicle or a manned aerial vehicle.

[0026] In addition, in the present invention, the stator is formed so as to enclose the rotor, and the rotor is provided so as to be rotatable inside the stator. This configuration makes it possible to suppress noise.

[0027] In addition, in the present invention, the stator is provided with a sound absorbing material, which allows for further noise suppression.

[0028] In addition, in the present invention, the stator has an intake port on the top side and an exhaust port on the bottom side. The fan for generating thrust for the rotor is installed so that the intake port is located directly above and the exhaust port is located directly below. This makes it possible to minimize energy loss in the series of processes of "intake of air into the duct," "compression of the airflow," and "discharge of the jet."

[0029] In addition, in the present invention, the stator has a jet control member (duct outlet shape) for controlling the jet ejection direction to enhance the propulsive force. This jet control member is provided, for example, at the bottom of the stator so as to surround the exhaust port (the part from which the jet is ejected) and plays a role in maximizing the thrust amplification by the Coanda effect. By providing such a jet control member, the diffusion of the jet ejected from the exhaust port is suppressed, and the jet is concentrated and ejected in a certain direction, and by adding the Coanda effect to this, it is possible to maximize the thrust. In other words, it is possible to convert the jet generated by the thrust generating fan into thrust without waste.

[0030] In addition, in the present invention, the stator is provided with an intrusion prevention means (for example, a honeycomb cover) for preventing the intrusion of a human body or an obstacle into the inside of the stator, thereby further improving the safety of the propulsion device. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a perspective view of a shaftless propulsion device of the present invention, seen obliquely from above. [Diagram 2] FIG. 2 is a perspective view of the shaftless propulsion device of the present invention, seen obliquely from below. [Diagram 3] FIG. 2 is a perspective view of the shaftless propulsion device of the present invention (without the honeycomb cover) as seen obliquely from above. [Figure 4] FIG. 2 is a perspective view of the shaftless propulsion device of the present invention (without the honeycomb cover) as seen obliquely from below. [Diagram 5] FIG. 1 is a cross-sectional perspective view of a shaftless propulsion device of the present invention, seen obliquely from above. [Figure 6] FIG. 2 is a cross-sectional perspective view of the shaftless propulsion device of the present invention, seen obliquely from below. [Figure 7] FIG. 2 is a partial cross-sectional view (enlarged view) showing the shaftless propulsion device of the present invention. [Figure 8]Fig. 8(a) is a cross-sectional view showing a schematic configuration of a rotary electric motor equipped in a shaftless propulsion device of the present invention, in which Fig. 8(a) shows a state in which the stator and rotor of the shaftless propulsion device are combined, Fig. 8(b) shows only the rotor of the shaftless propulsion device, and Fig. 8(c) shows only the stator of the shaftless propulsion device. Note that Fig. 8 omits the illustration of the rotor fan, stator duct, etc. [Figure 9] FIG. 2 is a plan view showing an example of a permanent magnet arrangement and a coil arrangement of a rotary motor provided in the shaftless propulsion device of the present invention. [Figure 10] FIG. 2 is an enlarged plan view showing an example of a permanent magnet arrangement of a rotary motor provided in the shaftless propulsion device of the present invention. [Figure 11] A cross-sectional view showing the function and operation of the shaftless propulsion device of the present invention. [Figure 12] A cross-sectional view showing the function and operation of a shaftless propulsion device (modification) of the present invention. [Figure 13] A cross-sectional view showing the function and operation of a shaftless propulsion device (modification) of the present invention. [Figure 14] A cross-sectional view showing the function and operation of a shaftless propulsion device (modification) of the present invention. [Figure 15] FIG. 15(a) is a cross-sectional view showing a typical magnet arrangement in which north and south poles are arranged side by side, and FIG. 15(b) is a cross-sectional view showing a Halbach array in which permanent magnets with rectangular cross sections are arranged in a row while being rotated by 90° each time. [Figure 16] FIG. 1 is a cross-sectional view showing a dual Halbach array formed by arranging two Halbach arrays in rows. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, specific embodiments of the shaftless propulsion device will be described with reference to the accompanying drawings.

[0033] (Outline of shaftless propulsion device) First, the configuration of a shaftless propulsion device (hereinafter simply referred to as "propulsion device") will be roughly described with reference to Figs. 1 to 8.

[0034] The propulsion device 1 of this embodiment is a device that generates a jet using a rotary motor as a power source and uses the reaction force as a propulsive force. In this embodiment, the propulsion device is configured as a disk-shaped device with a cavity in the center, as shown in FIG.

[0035] As shown in Figs. 1 to 8 (mainly Fig. 5), the disk-shaped propulsion device 1 having a cavity in the center is as follows: A substantially ring-shaped stator 2 having a cavity 3 in the center, A substantially ring-shaped rotor 5 that rotates in a substantially ring-shaped space inside the stator 2; A ring-shaped bearing unit 8 that rotatably supports the rotor 5 is provided. The present invention is configured to include a rotary motor having a

[0036] As shown in FIG. 5, the stator 2 is formed in a substantially ring shape so as to enclose the rotor 3, and the rotor 3 is provided rotatably in the inner space of the stator 2 (the substantially ring-shaped space).

[0037] The stator 2 has an intake port 27 covered with a honeycomb cover 33 on the top surface, an exhaust port 28 on the bottom surface, and a ring-shaped coil arrangement 23 in the approximately ring-shaped space inside. The ring-shaped coil arrangement 23 is supported by the bottom of the stator 2.

[0038] The rotor 5, which is rotatably mounted in the inner space (approximately ring-shaped space) of the stator 2, has ring-shaped permanent magnet arrangements 53, 54, a fan 65 that compresses the air flow to generate a jet, and a cooling fan 66 for cooling the rotating motor composed of a coil arrangement, etc.

[0039] As shown in FIG. 7, the bearing unit 8, which supports the rotor 5 for free rotation, has an inner ring 81 fixed to the stator, an outer ring 83 fixed to the rotor, and rolling elements 85 interposed between the inner ring 81 and the outer ring 83.

[0040] In this embodiment, the bearing unit 8 is used as a means for rotatably supporting the rotor 5, but it is also possible to adopt a bearingless configuration. Such a bearingless configuration can be realized by adopting a magnetic levitation system, for example.

[0041] Incidentally, a propulsion device configured with a conventional rotary electric motor has a motor shaft (output shaft) at the center of the device to which a propeller is attached, but the propulsion device of this embodiment does not have a motor shaft and the center of the device is hollow. That is, while a propulsion device of the prior art requires a "motor shaft that coincides with the rotation axis (virtual rotation axis) of the rotor," the propulsion device of this embodiment has a hollow portion at the portion that coincides with the rotation axis (virtual rotation axis) of the rotor 5 and does not have a motor shaft. In this respect, it differs greatly from conventional motors.

[0042] The configurations of the stator 2 and the rotor 3 of the propulsion device 1 will be specifically described below.

[0043] (Stator configuration) The configuration of the stator 2 included in the propulsion device 1 will be described with reference to Figs.

[0044] As shown in FIG. 5, the stator 2 of the propulsion device 1 mainly includes: A substantially ring-shaped stator body 21 that contains the rotor 5; A ring-shaped coil arrangement 23 is provided inside the stator body 21. It has.

[0045] The stator body 21 is An annular portion 25 (a cylindrical portion) having a cavity 3 therein; An intake port 27 formed on the upper surface side of the stator body 21; A honeycomb-shaped cover 33 (intrusion prevention means) provided on the intake port 27; A bottom portion 29 having a plurality of substantially fan-shaped exhaust ports 28 formed therein; A duct 31 equipped with sound absorbing material such as glass wool is provided. It has.

[0046] In this embodiment, the annular portion 25 is formed in a substantially cylindrical shape, and has a cavity 3 on the inside. As shown in Fig. 7, an inner ring 81 of the bearing unit 8 is fixed to the outer circumferential surface of the annular portion 25. The annular portion 25 also functions as an inner duct. On the other hand, the duct 31 functions as an outer duct.

[0047] The cavity 3 located inside the annular portion 25 is formed to attract air from above, accelerate it, and expel it downward. No mechanical elements such as shafts or spokes are provided in the cavity 3. In other words, no elements are provided to obstruct the airflow passing through the cavity 3.

[0048] The intake port 27 is formed on the upper surface side of the stator body 21. A fan 65 for generating thrust for the rotor 5 and a cooling fan 66, which will be described later, are located directly below the intake port 27. By thus locating the fans 65, 66 directly below the intake port 27, air above the device is efficiently taken into the duct 31.

[0049] The honeycomb-shaped cover 33 functions as an intrusion prevention means for preventing the intrusion of a human body or obstacles into the inside of the stator 2. This cover 33 is provided so as to cover the intake port 27 on the upper surface side of the stator body 21, but does not prevent the intake of air from the intake port 27 because of its honeycomb structure with many holes.

[0050] In the present invention, the cover 33 is not an essential component, and a cover-free configuration may be employed as shown in Fig. 3, but from the perspective of ensuring safety, it is preferable to provide the cover 33 as shown in Fig. 1. Furthermore, when the cover 33 is provided, the configuration of the cover is not necessarily limited to the honeycomb structure as shown in the figure, and any configuration having holes, slits, or other vents that do not impede intake air can be used.

[0051] The bottom portion 29 is formed so as to expand outwardly in a flange shape from the lower end of the annular portion 25. The bottom portion 29 supports the ring-shaped coil array 23, as shown in FIG.

[0052] In addition, an exhaust port 28 for exhausting air from inside the stator 2 is formed in the bottom portion 29. In this embodiment, the exhaust port 28 is composed of a plurality of substantially fan-shaped openings formed at equal intervals. A jet of propulsion is ejected from this exhaust port 28, and the exhaust port 28 also serves as a heat exhaust port.

[0053] The duct 31 is provided so as to protrude upward from the outer edge of the bottom 29. The space between the duct 31 and an outer magnet support part 64 of the rotor 5 described later functions as an air compression chamber for compressing the air flow to generate a jet. In this air compression chamber, the fan 65 rotates and compresses the air flow to generate a jet that serves as a propulsive force, and is discharged from the exhaust port 28.

[0054] Although not shown in the embodiment shown in Figs. 1 to 11, as in the modified example shown in Figs. 12 to 14, a jet flow control member 35 (jet flow control nozzle) for controlling the ejection direction of the jet flow to enhance the thrust may be provided on the bottom 29. This jet flow control member 35 plays a role of maximizing the thrust amplification by the Coanda effect. In the modified example shown in Fig. 12, the jet flow control member 35 is composed of a double ring nozzle (outer nozzle and inner nozzle) provided concentrically. This jet flow control member 35 is provided on the bottom of the stator 2 so as to surround, for example, the exhaust port 28 (the part from which the jet flow is ejected). The shape of the jet flow control member 35 is not particularly limited, and double ring nozzles of various cross-sectional shapes can be adopted as exemplified in Figs. 12 to 14.

[0055] The inner wall of the duct 31 is provided with a sound absorbing material such as glass wool. Inside the duct 31, noise occurs as the rotor 5 rotates, but by providing the sound absorbing material on the inner peripheral surface of the duct 31 surrounding the rotor 5, the noise during operation is suppressed. The location where the sound absorbing material is attached is not particularly limited. For example, the duct 31 may have a double structure with the sound absorbing material provided inside. By making the duct 31 have a double structure in this way, it is possible to achieve further noise reduction, and by storing the sound absorbing material inside the duct, it is possible to reliably prevent it from falling off.

[0056] In this embodiment, the stator body 21 is formed in a substantially ring shape (substantially doughnut shape) so as to integrally have the annular portion 25, the bottom portion 29, the duct 31, and the honeycomb-shaped cover 33. The stator body 21 also has a ring-shaped space therein in which the rotor 5 is rotatably provided.

[0057] (Rotor configuration) Next, the configuration of the rotor 5 provided in the propulsion device 1 will be described with reference to Figs.

[0058] As shown in FIG. 5, the rotor 5 of the propulsion device 1 is rotatably provided inside the stator 2, and the stator 2 is formed so as to encase the rotor 5.

[0059] As shown in FIGS. 5 to 7, the rotor 5 is A rotor body 51 that is arranged to rotate between the annular portion 25 that is an inner duct and the duct 31 that is an outer duct; an inner magnet array 53 (first permanent magnet array) arranged in a ring shape; The outer magnet array 54 (second permanent magnet array) is arranged in a ring shape. Possess

[0060] As shown in FIG. 7, the rotor body 51 is An outer ring support portion 61 to which an outer ring 81 of the bearing unit 8 is fixed, An inner magnet support portion 63 (first magnet support portion) that supports the inner magnet array 53; An outer magnet support portion 64 (second magnet support portion) that supports the outer magnet array 54; A thrust generating fan 65 located directly above the exhaust port 28; A cooling fan 66 is located directly above the coil array 23 and the permanent magnet arrays 63 and 64. It has it as an integral part.

[0061] The inner magnet array 53 supported by the inner magnet support portion 63 is composed of a plurality of permanent magnets in a Halbach array. The inner magnet array 53 is arranged in a ring shape so as to be located inside the coil array 23.

[0062] The outer magnet array 54 supported by the outer magnet support portion 64 is composed of a plurality of permanent magnets in a Halbach array. The outer magnet array 54 is arranged in a ring shape so as to be located outside the coil array 23.

[0063] The ring-shaped permanent magnet arrays 53 and 54 supported by magnet support portions 63 and 64 are disposed opposite each other across the coil array 23 fixed to the bottom portion 29 of the stator 2 .

[0064] The thrust generating fan 65 is provided so as to be located outside the ring-shaped space in the stator body 21 and directly above the exhaust port 28. This thrust generating fan 65 compresses the air flow in the space between the outer circumferential surface of the outer magnet support part 64 and the inner circumferential surface of the duct 31. The air flow compressed in the duct 31 becomes a jet flow and is discharged from the exhaust port 28 directly below the fan 65.

[0065] The cooling fan 66 is located inside the ring-shaped space in the stator body 21 and is provided so as to be located directly above the exhaust port 28 across the coil array 23 and the permanent magnet arrays 53, 54.

[0066] (Permanent magnet arrangement structure) In a typical motor, permanent magnets are arranged so that N poles and S poles alternate, but with such an arrangement, magnetic fields are generated on both the front and back sides of the magnet arrangement, making it impossible to effectively utilize the magnetic field. Therefore, in this embodiment, a permanent magnet arrangement structure called a "Halbach array" is adopted as a means of increasing the magnetic field of the motor.

[0067] In the Halbach array used in this embodiment, the magnetic poles of the permanent magnets are arranged while being rotated by 90°, so that the magnetic field on one side of the magnet array is weakened and the magnetic field on the other side of the magnet array is correspondingly stronger, so that a strong magnetic field can be generated on one side of the permanent magnet array. Therefore, in this embodiment, as shown in Fig. 9, a rotary motor structure is adopted in which a coil array 23 consisting of an armature coil is arranged between two rows of permanent magnet arrays 53, 54 (so-called dual Halbach array) each arranged in a Halbach array.

[0068] The specific details will be explained below.

[0069] The propulsion device 1 of this embodiment includes a stator 2 and a rotor 5. The stator 2 includes a coil arrangement 23. The rotor 5 includes permanent magnet arrays 53, 54. The permanent magnet arrays 53, 54 are each configured in a ring shape, and the coil array 23 is also configured in a ring shape. The permanent magnet arrays 53, 54 and the coil array 23 are arranged concentrically. The inner magnet array 53 is provided inside the outer magnet array 54.

[0070] As shown in FIG. 10, the permanent magnet arrays 53 and 54 are arranged in a Halbach array in which the magnetic poles of the permanent magnets are rotated by approximately 90°.

[0071] As shown in FIG. 9, the number of permanent magnets in the inner magnet array 53 is the same as the number of permanent magnets in the outer magnet array 54.

[0072] Also, as shown in Figure 10, The magnetic pole direction of the permanent magnets magnetized in the “radial direction” among the permanent magnets in the inner magnet array 53 and the magnetic pole direction of the permanent magnets magnetized in the “radial direction” among the permanent magnets in the outer magnet array 54 are “the same” if they are arranged on the same radius. The magnetic pole direction of the permanent magnets magnetized in the “circumferential direction” among the permanent magnets in the inner magnet array 53 and the magnetic pole direction of the permanent magnets magnetized in the “circumferential direction” among the permanent magnets in the outer magnet array 54 are “opposite” between those arranged on the same radius.

[0073] In the inner magnet array 53, the magnetic poles of the permanent magnets are arranged while being rotated approximately 90° in circumferential directions, so that the magnetic field on one side (inner side) of the array is weakened and the magnetic field on the other side (outer side) of the array is correspondingly stronger, thereby enabling a strong magnetic field to be generated on one side (outer side) of the inner magnet array 53.

[0074] In the outer magnet array 54, the magnetic poles of the permanent magnets are arranged while being rotated approximately 90° in circumferential directions, so that the magnetic field on one side (the outside) of the array is weakened and the magnetic field on the other side (the inside) of the array is correspondingly stronger, thereby enabling a strong magnetic field to be generated on one side (the inside) of the outer magnet array 54.

[0075] In the above-described embodiment, in the outer magnet array 54, the magnetic poles of the permanent magnets are arranged while being rotated by approximately 90° in the circumferential direction, so that the magnetic field is weakened on the outside of the ring-shaped array and the magnetic field is strengthened on the inside of the ring-shaped array accordingly, generating a strong magnetic field on the inside of the outer magnet array 54, and in the inner magnet array 53, the magnetic poles of the permanent magnets are arranged while being rotated by approximately 90° in the circumferential direction, so that the magnetic field is weakened on the inside of the ring-shaped array and the magnetic field is strengthened on the outside of the ring-shaped array accordingly, generating a strong magnetic field on the outside of the inner magnet array 53, but the magnetic poles do not have to be rotated by approximately 90° in the circumferential direction, and may be rotated by, for example, approximately 45°. Alternatively, they may be rotated by an angle obtained by dividing 360° by an integer of 3 or more.

[0076] In this embodiment, a Halbach array is used as an example of a permanent magnet arrangement, but the permanent magnet arrangement in the present invention is not limited to the Halbach array, and it is also possible to adopt a general magnet arrangement in which the N pole and the S pole are arranged adjacent to each other.

[0077] In addition, in this embodiment, a structure is adopted in which an armature coil is arranged between two rows of permanent magnets arranged in a Halbach arrangement (dual Halbach arrangement), but it is also possible to adopt a single row of permanent magnets arranged in a Halbach arrangement (so-called single Halbach arrangement) on only one side, either the inside or outside, of the armature coil.

[0078] (Functions of the propulsion device) Next, the functions and operations of the propulsion device having the above-mentioned configuration will be described with reference to Fig. 11. Note that Figs. 5 to 7 will be referred to as necessary for the configuration of the propulsion device.

[0079] When the rotor 5 equipped with the fans 65, 66 rotates within the stator 2, air is sucked into the inside of the stator 2 (inside the duct 31) through the air intake 27.

[0080] A portion of the air drawn into the duct 31 is guided by a cooling fan 66 toward the coil arrangement 23 to cool the entire rotary motor including the coils, and the heat is discharged from the exhaust port 28 directly below.

[0081] Moreover, most of the air sucked into duct 31 is compressed inside duct 31 by the rotation of thrust generating fan 65, and is discharged as a jet from exhaust port 28 directly below. At this time, the air around the duct 31 is drawn in by the Coanda effect and is entrained in the jet, thereby increasing the thrust. Furthermore, air above the propulsion device is drawn into the cavity 3 in the center of the propulsion device, accelerated by the surrounding jets, and discharged in an accelerated state from the bottom of the cavity 3.

[0082] 12 to 14, the jet from the exhaust port 28 is ejected through between the outer nozzle and the inner nozzle of the jet control member 35. This controls the ejection direction of the jet, enhancing the propulsive force. In other words, by providing the jet control member 35, the diffusion of the jet ejected from the exhaust port 28 to the surroundings is suppressed, and the jet is concentrated and ejected in a certain direction. Furthermore, by adding the Coanda effect to this, it is possible to maximize the thrust. [Explanation of symbols]

[0083] 1 Shaftless propulsion system 2 Stator 3 cavities 5 Rotor 8 Bearing Unit 21 Stator body 23 Coil Array 25 Annular section (cylindrical section / inner duct) 27 Air Intake 28 Exhaust port 29 Bottom 31 Duct 33 Honeycomb cover (anti-intrusion measure) 35 Jet control components (jet control nozzles / duct outlet shapes) 51 Rotor body 53 Inner magnet array (first permanent magnet array) 54 Outer magnet array (second permanent magnet array) 61 Outer ring support 63 inner magnet support portion (first magnet support portion) 64 outer magnet support portion (second magnet support portion) 65 Thrust generating fan 66 Cooling fan 81 Inner Circle 83 Outer Ring 85 Rolling elements

Claims

1. 1. A shaftless propulsion device comprising a rotary electric motor having an annular stator and an annular rotor, The stator has a ring-shaped coil arrangement, The rotor has a ring-shaped permanent magnet arrangement and a fan for generating thrust. The permanent magnet arrangement provided on the rotor includes: a first permanent magnet array positioned inside the coil array of the stator and composed of a plurality of permanent magnets in a Halbach array; a second permanent magnet array positioned outside the coil array of the stator and configured with a plurality of permanent magnets in a Halbach array; A shaftless propulsion device comprising:

2. A fan for generating thrust provided on the rotor, The rotor is provided to surround a cavity at the center of the stator.

2. A shaftless propulsion device according to claim 1.

3. The rotor further includes a cooling fan.

3. A shaftless propulsion device according to claim 1 or 2.

4. The stator is formed to enclose the rotor, The rotor is rotatably mounted inside the stator.

4. A shaftless propulsion device according to claim 1, wherein the shaftless propulsion device is a

5. The stator has a sound absorbing material.

5. A shaftless propulsion device according to claim 1 , characterized in that

6. The stator is It has an intake port on the top surface for drawing air into the interior, It has an exhaust port on the bottom side for exhausting air from the inside.

6. A shaftless propulsion device according to claim 1, wherein the shaftless propulsion device is a

7. The shaftless propulsion device generates a jet flow by the thrust generating fan, ejects the jet flow from an exhaust port of a stator, and utilizes the reaction force as a propulsive force; 7. A shaftless propulsion device according to claim 1, wherein the stator has a jet control member for controlling the direction of the jet to enhance the propulsive force.

8. 8. A shaftless propulsion device according to claim 1, wherein the stator has an intrusion prevention means for preventing a human body or an obstacle from intruding into the inside of the stator.

9. An aircraft comprising a shaftless propulsion device according to any one of claims 1 to 8.

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