Magnetic rotating device and power generating device incorporating the same

Abstract

To provide a magnetic rotating device and a power generating device incorporating the magnetic rotating device, which has a simple structure but can effectively extract positive energy, which is the repulsive force between magnets that rotate a rotor. [Solution] The magnetic rotating device has a rotor-side magnetic force shielding plate 42 that blocks the magnetic force of the bar magnet 66 on the downstream side, as viewed from the direction of rotation of the rotor 34, of the outer opposing surface 66A, which is the opposing surface of the bar magnet 66 of the rotor-side magnet section 38 to the bar magnet 70 of the fixed-side magnet section 40, and a fixed-side magnetic force shielding plate 44 that blocks the magnetic force of the bar magnet 70 on the upstream side, as viewed from the direction of rotation of the rotor 34, of the inner opposing surface 70A, which is the opposing surface of the bar magnet 70 of the fixed-side magnet section 40 to the bar magnet 66 of the rotor-side magnet section 38.

Description

[Technical Field]

[0001] The present invention relates to a magnetic rotating device and a power generating device incorporating the same, and more particularly to a magnetic rotating technology that utilizes the repulsive force generated by the magnetic force between magnets for rotation. [Background technology]

[0002] Permanent magnet motors and generators are well-known examples of applications of magnetic rotating devices that use the repulsive force generated by the magnetic attraction between magnets to rotate the rotor. A typical magnetic rotating device uses the repulsive force generated when the opposing magnets on the rotor and fixed side have the same magnetic poles to rotate the rotor.

[0003] However, the repulsive force of magnetic poles of the same polarity becomes positive energy that promotes rotor rotation when the magnets on the rotor side and the magnets on the fixed side move apart as the rotor rotates, but becomes negative energy that hinders rotor rotation when they move closer together. Also, because magnets have north and south poles, in addition to the repulsive force caused by magnetic poles of the same polarity, an attractive force caused by magnetic poles of different polarity also occurs. Therefore, to increase the rotational force of a magnetic rotating device, it is important to effectively extract only the repulsive force, i.e., only positive energy, that occurs when the magnets on the rotor side and the magnets on the fixed side move apart as the rotor rotates.

[0004] To solve this problem, for example, a magnetic rotating device is proposed in Patent Document 1. The magnetic rotating device in Patent Document 1 includes a rotating shaft, a rotor with multiple magnets arranged at the end of the outer periphery with their magnetic poles aligned radially, a stator with the same number of magnets as the rotor magnets arranged radially opposite the rotor magnets, a magnetically shielded rotor with slits and shielding plates made of ferromagnetic material arranged alternately, a rotor detection sensor located near the rotor, and a magnetically shielded rotor detection sensor located near the magnetically shielded rotor. The rotor detection sensor and the magnetically shielded rotor detection sensor then insert the magnetically shielded rotor between the rotor magnets and the stator magnets at the appropriate time. This artificially creates an imbalance between the repulsive and attractive forces between the rotor magnets and the stator magnets, minimizing the rotational energy acting in the negative direction of the rotor rotation and extracting the magnetic force as rotational energy. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-200159 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the method of inserting the magnetically shielded rotor between the rotor magnet and the stator magnet at the right time using a rotor detection sensor and a magnetically shielded rotor detection sensor, as in the magnetic rotating device of Patent Document 1, has the drawbacks of being mechanically complex and prone to timing errors due to the detection accuracy of the sensors, etc. When timing errors occur, it is not possible to effectively extract the repulsive force, i.e., positive energy, when the rotor magnet and the stator magnet separate.

[0007] Furthermore, magnets have north and south poles, and in addition to the repulsive force caused by magnetic poles of the same polarity, an attractive force is also generated by magnetic poles of different polarity. Therefore, simply inserting a magnetically shielded rotating body between the rotor magnet and the stator magnet cannot effectively extract the repulsive force that occurs when the rotor-side magnet and the stator-side magnet separate as the rotor rotates.

[0008] The present invention was made in consideration of the above circumstances, and aims to provide a magnetic rotating device that has a simple structure yet can reduce rotational friction, and a power generating device incorporating the same. [Means for solving the problem]

[0009] According to a first aspect of the present invention, a magnetic rotating device that uses the magnetic force of a magnet as a rotational force comprises a hollow shaft rotatably supported around a stepped shaft with a keyway as a step, an outer ring cover band fixed to the hollow shaft and rotating around the axis of the hollow shaft as a rotation center, an outer ring magnet portion fixed to the outer ring cover band, and a plurality of first bar magnets, the first bar magnets are arranged on the stepped shaft to form equally spaced gaps along the rotation direction of the stepped shaft, the magnetization directions of the first bar magnets are aligned along a radial direction perpendicular to the axis of the hollow shaft, and the radial direction of the first bar magnets is and an outer ring magnet section, which is made up of an inner ring magnet section arranged so that all of the outer magnetic poles on the outside in the circumferential direction have the same polarity, and a plurality of second bar magnets, the second bar magnets are arranged on the inner circumferential surface of the outer ring cover band to form equally spaced gaps in the circumferential direction, the magnetization directions of the second bar magnets are aligned along a radial direction perpendicular to the axis of the hollow shaft, and the inner magnetic pole of the second bar magnet facing the inner ring magnet section of the inner ring magnet section is arranged so that it has the same polarity as the outer magnetic pole of the first bar magnet. Of the outer opposing surfaces, which are surfaces of the second bar magnet of the outer ring magnet section, a magnetic plate on the inner ring magnet section side is provided on the downstream surface as seen from the direction of rotation of the outer ring cover band, and of the inner opposing surfaces, which are surfaces of the second bar magnet of the outer ring magnet section facing the first bar magnet of the inner ring magnet section, a magnetic plate on the outer ring cover band side is provided on the upstream surface as seen from the direction of rotation of the outer ring cover band, so that the magnetic pole of the concave surface of the gap formed between adjacent first bar magnets of the inner ring magnet section has the same polarity as the outer magnetic pole, which is the magnetic pole of the outer opposing surface of the first bar magnet of the inner ring magnet section, and a first auxiliary magnet is provided on each of the concave surfaces of the gaps formed between adjacent second bar magnets so that the magnetic poles of the concave surfaces of the gaps have the same polarity as the inner magnetic poles, which are the magnetic poles of the inner opposing surfaces of the second bar magnets; and second auxiliary magnets of the inner ring magnet section are provided on the left and right surfaces, as viewed from the direction of rotation of the outer ring cover band, so as to hide the magnetic pole portion of the first bar magnet opposite the outer magnetic pole; the second auxiliary magnets of the inner ring magnet section are arranged so that their magnetization directions are aligned along the radial direction and all of the outer magnetic poles in the radial direction have the same polarity as the outer magnetic poles;The second auxiliary magnets of the outer ring magnet section are provided on the left and right surfaces, as viewed from the direction of rotation of the outer ring cover band, so as to conceal the magnetic pole portion of the second bar magnet opposite to the inner magnetic pole, and the second auxiliary magnets of the outer ring magnet section are arranged so that their magnetization directions are aligned along the radial direction and that all of the inner magnetic poles in the radial direction have the same polarity as the inner magnetic pole, and the third auxiliary magnets of the inner ring magnet section are provided on the left and right surfaces, as viewed from the direction of rotation of the outer ring cover band, so as to conceal at least the magnetic pole portion of the inner magnetic pole in the radial direction of the second auxiliary magnet of the inner ring magnet section, and the magnetization direction of the third auxiliary magnet of the inner ring magnet section is parallel to the cavity axis and When the stone is placed on the left surface, magnetic pole portions of the same polarity as the outer magnetic pole are arranged on the left surface side, and when the stone is placed on the right surface, magnetic pole portions of the same polarity as the outer magnetic pole are arranged on the right surface side, and third auxiliary magnets of the outer ring magnet unit are provided on the left and right surfaces as viewed from the rotation direction of the outer ring cover band so as to hide at least the magnetic pole portion of the outer magnetic pole in the radial direction of the second auxiliary magnet, and the magnetization direction of the third auxiliary magnet of the outer ring magnet unit is parallel to the cavity axis, and when the third auxiliary magnet of the outer ring magnet unit is placed on the left surface, magnetic pole portions of the same polarity as the inner magnetic pole are arranged on the left surface side, and when the stone is placed on the right surface, magnetic pole portions of the same polarity as the inner magnetic pole are arranged on the right surface side.

[0010] In the magnetic rotating device according to the second aspect of the present invention, the outer ring cover band and the hollow shaft are preferably fixed together via an outer ring flywheel.

[0011] In the magnetic rotating device according to the third aspect of the present invention, the outer ring flywheels are preferably provided on both sides of the outer ring magnet portion in the axial direction.

[0012] A magnetic rotating device according to a fourth aspect of the present invention further includes a disc brake that can fix and release the stepped shaft, wherein the stepped shaft fixes the inner ring magnet portion, is positioned with a gap between it and the hollow shaft, and is rotatably supported from a base, and the disc brake is operated to rotate the outer ring rotor composed of the outer ring magnet portion and the outer ring flywheel.

[0013] A power generating device according to a fifth aspect of the present invention includes a motor, a generator that generates electricity by rotating a power generating rotor using the motor as a rotational drive source, a magnetic rotating device according to the fourth aspect provided between the motor and the power generating rotor, a disc brake that can fix and release the hollow shaft, a coupling that can connect and release the rotating shaft of the motor and the stepped shaft, the disc brake that can fix and release the stepped shaft, and a coupling that can connect and release the rotating shaft of the power generating rotor and the stepped shaft.

[0014] In a generator according to a sixth aspect of the present invention, the bearing supporting the hollow shaft and the stepped shaft comprises a plurality of first bar magnets, with the hollow shaft and the stepped shaft as rotors, the first bar magnets being arranged on the stepped shaft with equally spaced gaps along the rotation direction of the stepped shaft, the magnetization directions of the first bar magnets being aligned along a radial direction perpendicular to the axis of the rotating shaft, and the outer magnetic poles of the first bar magnets on the outer side in the radial direction all having the same polarity, and a plurality of second bar magnets, a hollow shaft-side magnet portion arranged on the inner peripheral surface on the hollow shaft side, with equally spaced gaps formed in the circumferential direction, the magnetization directions of the second bar magnets being aligned along a radial direction perpendicular to the axial center of the rotating shaft, and the inner magnetic pole of the second bar magnet facing the stepped shaft-side magnet portion being arranged so as to have the same polarity as the outer magnetic pole of the first bar magnet; and a stepped shaft-side magnetic plate is provided on the downstream surface, as seen from the rotation direction of the stepped shaft, of an outer opposing surface of the first bar magnet of the stepped shaft-side magnet portion, which is the opposing surface of the hollow shaft-side magnet portion to the second bar magnet, A hollow shaft-side magnetic plate is provided on the upstream surface of the inner opposing surface of the stepped shaft-side magnet portion of the second bar magnet, which is the opposing surface facing the first bar magnet, as viewed from the direction of rotation of the hollow shaft, so that the magnetic pole of the concave surface of the gap formed between adjacent first bar magnets of the stepped shaft-side magnet portion has the same polarity as the outer magnetic pole, which is the magnetic pole of the outer opposing surface of the first bar magnet of the stepped shaft-side magnet portion, and the magnetic pole of the concave surface of the gap formed between adjacent second bar magnets of the hollow shaft-side magnet portion has the same polarity as the magnetic pole of the inner opposing surface of the second bar magnet of the hollow shaft-side magnet portion. A first auxiliary magnet is provided so as to have the same polarity as a certain inner magnetic pole, and a second auxiliary magnet is provided on the stepped shaft side on the left and right faces as viewed from the direction of rotation of the hollow shaft so as to hide the magnetic pole portion of the first bar magnet opposite to the outer magnetic pole, and the magnetization direction of the second auxiliary magnet on the stepped shaft side is aligned along the radial direction, and the outer magnetic poles in the radial direction are all arranged so as to have the same polarity as the outer magnetic pole, and the left and right faces as viewed from the direction of rotation of the hollow shaft are provided so as to hide the magnetic pole portion of the second bar magnet opposite to the inner magnetic pole,A second auxiliary magnet is provided on the hollow shaft side, and the second auxiliary magnet on the hollow shaft side is arranged so that its magnetization direction is aligned along the radial direction and all of the inner magnetic poles in the radial direction have the same polarity as the inner magnetic pole, and a third auxiliary magnet on the rotor side is provided on the left and right faces as viewed from the rotation direction of the hollow shaft so as to hide at least the magnetic pole portion of the inner magnetic pole in the radial direction of the second auxiliary magnet on the stepped shaft side, and the magnetization direction of the third auxiliary magnet on the stepped shaft side is parallel to the rotation axis, and when the third auxiliary magnet on the stepped shaft side is arranged on the left face, a magnetic pole portion of the same polarity as the outer magnetic pole is provided on the left face When the third auxiliary magnet is disposed on the left surface, a magnetic pole portion of the same polarity as the outer magnetic pole is arranged on the right surface side, and a third auxiliary magnet on the hollow axis side is provided on the left and right surfaces as viewed from the rotation direction of the hollow axis so as to hide at least the magnetic pole portion of the outer magnetic pole in the radial direction of the second auxiliary magnet on the hollow axis side, and the magnetization direction of the third auxiliary magnet on the hollow axis side is parallel to the rotation axis, and when the third auxiliary magnet on the hollow axis side is disposed on the left surface, it is preferable that a magnetic pole portion of the same polarity as the inner magnetic pole is arranged on the left surface side, and when disposed on the right surface, a magnetic pole portion of the same polarity as the inner magnetic pole is arranged on the right surface side. [Effects of the Invention]

[0015] The magnetic rotating device of the present invention has a simple structure yet can reduce rotational friction. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram showing the overall configuration of a power generating device according to the present invention; [Figure 2] 1A is a side view of a magnetic rotating device according to a first embodiment of the present invention, and FIG. 1B is a front cross-sectional view taken along line aa in FIG. 1A. [Figure 3] 10 is a perspective view illustrating a rotor-side magnetic plate and a fixed-side magnetic plate provided on the bar magnet of the rotor-side magnet portion and the bar magnet of the fixed-side magnet portion, respectively. FIG. [Figure 4] FIG. 4 is a perspective view illustrating a modified example of FIG. 3. [Figure 5] 4A and 4B are explanatory diagrams illustrating examples of the configuration of a rotor-side magnetic plate and a fixed-side magnetic plate. [Figure 6A] 10A and 10B are explanatory diagrams illustrating another example of the configuration of the rotor-side magnetic plate and the fixed-side magnetic plate. [Figure 6B] FIG. 6B is an explanatory diagram illustrating a modification of FIG. 6A. [Figure 7] 10A and 10B are explanatory diagrams illustrating still another example of the configuration of the rotor-side magnetic plate and the fixed-side magnetic plate. [Figure 8] 3 is an explanatory diagram illustrating the operation of the magnetic rotating device according to the first embodiment of the present invention. FIG. [Figure 9] 10A is a side view of a magnetic rotating device according to a second embodiment of the present invention, and FIG. 10B is a front cross-sectional view taken along line bb of FIG. 10A. [Figure 10] 10 is an explanatory diagram of a modified example of the magnetic rotating device according to the second embodiment of the present invention; FIG. [Figure 11] 10 is an explanatory diagram of another aspect of the magnetic rotating device according to the second embodiment of the present invention. FIG. [Figure 12] FIG. 10 is a front cross-sectional view of a magnetic rotating device according to a third embodiment of the present invention. [Figure 13] FIG. 10 is a front cross-sectional view of a magnetic rotating device according to a fourth embodiment of the present invention. [Figure 14] FIG. 10 is a diagram showing the overall configuration of a power generating device according to a fifth embodiment of the present invention. [Figure 14A] FIG. 10 is a configuration diagram showing a motor unit of a fifth embodiment. [Figure 14B] FIG. 10 is a configuration diagram showing a magnetic rotating device according to a fifth embodiment. [Figure 14C] FIG. 10 is a configuration diagram showing a generator section of a fifth embodiment. [Figure 15] FIG. 10 is a cross-sectional side view of a magnetic bearing according to a fifth embodiment. [Figure 16] FIG. 10 is a front cross-sectional view of a magnetic bearing according to a fifth embodiment. [Figure 17] FIG. 13 is a configuration diagram showing a modified example of the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a magnetic rotating device and a power generating device 10 incorporating the same according to the present invention will now be described with reference to the accompanying drawings.

[0018] The present invention is described by the following preferred embodiments. It is understood that many modifications can be made and other embodiments can be utilized without departing from the scope of the present invention. Therefore, all modifications within the scope of the present invention are encompassed within the scope of the appended claims.

[0019] The magnetic rotating device of the present invention is a rotating device that rotates a rotor by utilizing the repulsive force that occurs when the magnetic poles of opposing magnets on the rotor side and the fixed side are made the same polarity, and requires a rotary drive source to rotate the rotor. In other words, it is not used alone, but is rotated by the torque of a rotary drive source such as a motor 12. Therefore, in the following explanation, we will first explain the power generating device 10 of the present invention, which incorporates the magnetic rotating device of the present invention, and then we will explain the magnetic rotating device of the present invention.

[0020] [Power generation equipment] Fig. 1 is a partial cross-sectional view of the overall configuration of a power generating device 10 of the present invention incorporating a magnetic rotating device of the present invention. Note that Fig. 1 incorporates the first embodiment of the magnetic rotating devices of the first to fourth embodiments described in detail below, but it goes without saying that the second, third, and fourth embodiments may also be incorporated.

[0021] As shown in Fig. 1, the power generating device 10 of the present invention is mainly composed of a motor 12, a generator 14 that uses the motor 12 as a rotational drive source to rotate a power generating rotor 14A to generate electricity, and a magnetic rotating device 16 of the present invention that is provided between the motor 12 and the power generating rotor 14A. Arrow A indicates the rotor rotation direction, and this also applies to Figs. 1 and subsequent figures.

[0022] The magnetic rotating device 16 is supported on a base 18 via a device frame 20. A vibration damping member 18A (e.g., a laminated rubber plate) is interposed between the base 18 and the device frame 20, and the base 18 and the device frame 20 are fixed together with fixing bolts 18B.

[0023] The motor 12 is supported on a base 18 via a motor mounting base 22, and the generator 14 is supported on the base 18 via a generator mounting base 24. The motor mounting base 22 and the generator mounting base 24 are each provided with bearings 26, which rotatably support both sides of a rotating shaft 28 of the magnetic rotating device 16.

[0024] Furthermore, the rotating shaft 12A of the motor 12 and one end of the rotating shaft 28 of the magnetic rotating device 16 are connected by a joint 30. Furthermore, the rotating shaft 14B of the power generation rotor 14A of the generator 14 and the other end of the rotating shaft 28 of the magnetic rotating device 16 are connected by a joint 30. Brake means 32 is provided at the portion of the pair of joints 30 to forcibly stop the rotation of the magnetic rotating device 16 when the motor 12 is stopped. The reason for providing the brake means 32 is that once the magnetic rotating device 16 starts to rotate, it will continue to rotate for a certain period of time even if the motor 12 is stopped.

[0025] The power generating device 10 of the present invention configured as described above generates electricity by using the motor 12 as a rotary drive source to rotate the generator rotor 14A of the generator 14. In this way, in the case of a generator 14 that generates electricity by rotating the generator rotor 14A using the motor 12 as a rotary drive source, the power of the generator 14 is determined by the output of the motor 12, i.e., the rotational force with which the motor 12 rotates. Therefore, in order to obtain a large amount of power generation, a large, high-output motor 12 must be used.

[0026] Therefore, in the power generating device 10 of the present invention, the magnetic rotating device 16 of the present invention is provided between the motor 12 and the power generating rotor 14A.

[0027] As a result, according to the power generating device 10 of the present invention, the magnetic rotating device 16 of the present invention is provided between the motor 12 and the power generating rotor 14A to transmit the rotational force of the motor 12 to the power generating rotor 14A. The configuration and operation of the magnetic rotating device 16 of the present invention will be described in detail below.

[0028] [First embodiment of magnetic rotating device] 2A is a side view of the magnetic rotating device of the first embodiment of the present invention, with the rotor rotation direction A facing the front, and 2B is a front cross-sectional view taken along line aa in 2A. In the front cross-sectional view of 2B, to make the cross-sectional structure easier to understand, the main components, namely the device frame, rotating shaft, rotor, fixed part, bar magnet, flywheel, rotor-side magnetic plate 42, and fixed-side magnetic plate 44, are hatched, but hatching of other components is omitted. This omission of hatching is also true for the front cross-sectional views from 2 onwards. Note that a permanent magnet is used as the bar magnet.

[0029] As shown in Figure 2, the magnetic rotating device 16 of the first embodiment of the present invention is mainly composed of a rotating shaft 28 supported for free rotation, a rotor 34, a fixed part 36, a rotor-side magnet part 38, a fixed-side magnet part 40, a rotor-side magnetic plate 42, and a fixed-side magnetic plate 44.

[0030] In FIG. 2, the device frame 20 is formed in a square tubular shape with an open surface in the axial direction of the rotary shaft 28 of the rotor 34, but it may also be formed in a cylindrical shape.

[0031] 1, the rotating shaft 28 is rotatably supported by a pair of bearings 26 arranged on the outside of the device frame 20, and a pair of flywheels 46, each with a diameter larger than that of the rotor 34, are provided on both sides of the rotating shaft 28, sandwiching the rotor 34. A shaft collar 48 ensures a fixed distance between the rotor 34 and the flywheels 46.

[0032] 2A, the rotor 34 has a circular shape and its center is fixed to the rotation shaft 28. As a result, the rotor 34 rotates together with the rotation shaft 28, with the central axis of the rotation shaft 28 as the center of rotation. The rotor 34 in this embodiment has a cylindrical fitting tube 34B that fits onto the rotation shaft 28 at the center of a disk-shaped rotor main body 34A that is perpendicular to the rotation shaft 28, and has a cylindrical outer ring tube 34C on the outside of the rotor main body 34A. A cylindrical tube 50 for fixing the rotor-side magnet section 38 is provided on the outside of the outer ring tube 34C.

[0033] 2B, a pair of opposing rotor-side side covers 52 are supported on the rotor main body 34A. The side covers 52 are preferably made of a non-magnetic material such as stainless steel. The side covers 52 are formed in the shape of a ring plate with an opening in the center, and the side covers 52 are connected to each other by multiple connecting bolts 54. One of the multiple connecting bolts 54 passes through a hole formed in a bar magnet 66 (first bar magnet, hereinafter simply referred to as "bar magnet 66"). As a result, the bar magnet 66 is supported on the side covers 52 via the connecting bolt 54.

[0034] The fixed portion 36 is fixed to the device frame 20. The fixed portion 36 is provided outside the rotor 34 so as to surround the rotor 34, and has an inner circumferential surface concentric with the rotor 34. The fixed portion 36 of this embodiment has a cylindrical outer tube 56 and a cylindrical inner tube 58, and is structured so that the device frame 20 and the outer tube 56 are connected at multiple locations with connecting bolts 60, and the outer tube 56 and the inner tube 58 are connected and fixed at multiple locations with connection adjustment bolts 62. The rotor 34 is disposed inside this inner tube 58, and the inner tube 58 has an inner circumferential surface concentric with the rotor 34. The fixed-side magnet portion 40 is provided on the inner circumferential surface of the inner tube 58.

[0035] 2A, the inner cylinder 58 has a structure in which a plurality of arc-shaped block plates 58A are arranged in a ring shape. To provide the fixed-side magnet section 40 on the inner peripheral surface of the inner cylinder 58, first, a bar magnet 66 is fixed to the arc-shaped block plates 58A, and then the arc-shaped block plates 58A are arranged in a ring shape while adjusting the distance from the outer cylinder 56 to the arc-shaped block plates 58A with the connection adjustment bolts 62.

[0036] As shown in FIG. 2B, a pair of opposing fixed-side side covers 61, 61 are supported on the outer cylinder 56. The side covers 61 are preferably made of a non-magnetic material such as stainless steel. The side covers 61 are formed in the shape of a ring plate with a central opening that is larger in diameter than the rotor-side side cover 52, and the side covers 61 are connected to each other by multiple connecting bolts 63. One of the multiple connecting bolts 63 passes through a hole formed in a bar magnet 70 (second bar magnet, hereinafter simply referred to as "bar magnet 70"). As a result, the bar magnet 70 is supported by the side covers 61 via the connecting bolt 63.

[0037] As shown in Figure 2(A), the rotor-side magnet section 38 is configured by arranging and fixing a plurality of bar magnets 66 in a cylindrical tube 50 on the outer peripheral surface of the rotor 34, with equally spaced gaps 64 between them along the rotor rotation direction A. As a result, the rotor-side magnet section 38 is formed as a magnet section in which a plurality of bar magnets 66 are arranged in a circle at equal intervals. Figure 2(A) shows an example in which 18 bar magnets 66 are arranged, but the number is not limited to this number.

[0038] The cylindrical tube 50 to which the bar magnet 66 is fixed is preferably made of a ferromagnetic material such as an iron plate. Any method for fixing the bar magnet 66 can be used as long as it secures the bar magnet 66 to the cylindrical tube 50, but it is preferable to use an adhesive to firmly fix the bar magnet 66.

[0039] The multiple bar magnets 66 of the rotor-side magnet section 38 are arranged in a magnetization direction such that the north and south poles are positioned in a radial direction perpendicular to the axis of the rotating shaft, and the outer magnetic poles on the outer side of the radial direction all have the same polarity. In this embodiment, the bar magnets 66 are arranged so that their north poles are the outer magnetic poles, but they may also be arranged so that their south poles are the outer magnetic poles.

[0040] 2(A), the fixed-side magnet section 40 is configured by arranging and fixing a plurality of bar magnets 70 with equally spaced gaps 68 in the circumferential direction on the inner peripheral surface portion of the fixed section 36, i.e., the inner peripheral surface portion of the cylindrical inner tube 58. As a result, the fixed-side magnet section 40 is formed as a magnet section in which the plurality of bar magnets 70 are arranged at equal intervals in a circle and is one size larger than the rotor-side magnet section 38.

[0041] In this case, it is preferable that the arc-shaped block plate 58A constituting the inner cylinder 58 is also formed of a ferromagnetic material such as an iron plate for the same reasons as those for the cylindrical cylinder 50, and that the bottom surfaces 70F of the bar magnets 70 are firmly fixed to the arc-shaped block plate 58A with adhesive (see Figures 3, 4 and 8). In addition, it is preferable that the number of bar magnets 70 in the fixed-side magnet section 40 is the same as that in the rotor-side magnet section 38.

[0042] The multiple bar magnets 70 of the fixed-side magnet section 40 are arranged in a magnetization direction such that the north and south poles are located in a radial direction perpendicular to the axis of the rotating shaft 28, and the inner magnetic pole facing the rotor-side magnet section 38 has the same polarity as the outer magnetic pole of the rotor-side magnet section 38. In this embodiment, the bar magnets 70 are arranged so that the north pole is the inner magnetic pole, but if the outer magnetic pole of the rotor-side magnet section 38 is an south pole, the inner magnetic pole of the fixed-side magnet section 40 also becomes an south pole.

[0043] The reason why the rotor-side magnet section 38 and the fixed-side magnet section 40 have gaps 64 (or gaps 68) is that if adjacent bar magnets 66 (or bar magnets 70) are in contact with each other, this has an adverse effect on the generation of repulsive force in the rotor rotation direction A. Therefore, it is preferable to form gaps 64 (or gaps 68) between adjacent bar magnets 66 (or bar magnets 70) in the rotor-side magnet section 38 and the fixed-side magnet section 40, with a gap distance of approximately one to two times the width of the bar magnets 66 (or bar magnets 70) as viewed in the rotor rotation direction A.

[0044] Next, we will explain the rotor side magnetic plate 42 and the fixed side magnetic plate 44.In this embodiment, the following explanation will be given assuming that the outer magnetic pole of the bar magnet 66 of the rotor side magnet section 38 and the inner magnetic pole of the bar magnet 70 of the fixed side magnet section 40 are N poles.

[0045] Figure 3 is an oblique view illustrating the rotor side magnetic plate 42 and the fixed side magnetic plate 44, in which the rotor side magnetic plate 42 and the fixed side magnetic plate 44 are fixed to the opposing surfaces of the bar magnet 66 of the rotor side magnet section 38 and the bar magnet 70 of the fixed side magnet section 40, respectively.

[0046] As shown in Figure 3, the rotor side magnetic plate 42 disturbs the magnetic field of the bar magnet 66, and is provided on the downstream surface, as viewed from the rotor rotation direction A, of the outer opposing surface 66A, which is the opposing surface of the bar magnet 66 of the rotor side magnet section 38 facing the bar magnet 70 of the fixed side magnet section 40.

[0047] In addition, the fixed side magnetic plate 44 disturbs the magnetic field of the bar magnet 70 and is provided on the upstream surface of the inner opposing surface 70A, which is the opposing surface of the bar magnet 70 of the fixed side magnet section 40 to the bar magnet 66 of the rotor side magnet section 38, as viewed from the rotor rotation direction A.

[0048] This disrupts the magnetic field from the downstream surface of the outer facing surface 66A, which is the pole surface of the bar magnet 66 with the strongest magnetic force among the bar magnets 66 of the rotor-side magnet section 38. Also, it disrupts the magnetic field from the upstream surface of the inner facing surface 70A, which is the pole surface of the bar magnet 70 with the strongest magnetic force among the bar magnets 70 of the fixed-side magnet section 40.

[0049] 3, it is preferable to cover with the rotor-side magnetic plate 42 the surface downstream of the center line M of half of the outer opposing surface 66A of the bar magnet 66 of the rotor-side magnet section 38 as seen from the rotor rotation direction A. On the other hand, it is preferable to cover with the rotor-side magnetic plate 42 the surface upstream of the center line M of half of the inner opposing surface 70A of the bar magnet 70 of the fixed-side magnet section 40 as seen from the rotor rotation direction A.

[0050] Furthermore, it is more preferable that the rotor-side magnetic plate 42 forms an eave portion 42A that protrudes from the end of the downstream surface of the outer opposing surface 66A of the bar magnet 66. It is also more preferable that the fixed-side magnetic plate 44 forms an eave portion 44A that protrudes from the end of the upstream surface of the inner opposing surface 70A of the bar magnet 70.

[0051] Figure 4 is a modification of Figure 3. As shown in Figure 4, the downstream half of the outer opposing surface 66A of the bar magnet 66 of the rotor-side magnet section 38 (the surface downstream of the center line M) is cut away to form a stepped surface 67 recessed from the outer opposing surface 66A, and the rotor-side magnetic plate 42 is embedded in this stepped surface 67. This allows the upstream surface of the outer opposing surface 66A of the bar magnet 66, where the rotor-side magnetic plate 42 is not provided, to be flush with the surface of the rotor-side magnetic plate 42.

[0052] Similarly, the upstream half of the inner facing surface 70A of the bar magnet 70 of the fixed-side magnet section 40 (the surface upstream of the center line M) is cut away to form a stepped surface 71 recessed from the inner facing surface 70A, and the fixed-side magnetic plate 44 is embedded in this stepped surface 71. This allows the downstream surface of the inner facing surface 70A of the bar magnet 70 of the fixed-side magnet section 40, where the fixed-side magnetic plate 44 is not provided, to be flush with the surface of the fixed-side magnetic plate 44.

[0053] Therefore, in Figure 4, the opposing surfaces of the bar magnets 66, 70 can be closer together than in Figure 3, and a greater repulsive force can be obtained. Note that, even when the rotor-side magnetic plate 42 and the fixed-side magnetic plate 44 are fixed to the outer opposing surfaces 66A and the inner opposing surfaces 70A of the bar magnets 66, 70 as in Figure 3, it is preferable to bring the bar magnets 66, 70 closer together without touching each other.

[0054] In the following explanation, we will use the example of Figure 3 in which the rotor-side magnetic plate 42 and the fixed-side magnetic plate 44 are fixed to the opposing surfaces of the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40, respectively. However, it goes without saying that a modified example in which the plates are embedded in the step surfaces 67 and 71 of Figure 4 may also be used.

[0055] 5 to 7 show examples of the configuration of the rotor-side magnetic plate 42 and the fixed-side magnetic plate 44. Since the rotor-side magnetic plate 42 and the fixed-side magnetic plate 44 have the same configuration, only the rotor-side magnetic plate 42 will be described in detail. In Figures 5 to 7, the center line P is a vertical line that indicates half the position of the outer facing surface 66A of the bar magnet 66 and the inner facing surface 70A of the bar magnet 70 in the rotor rotation direction A, and is synonymous with the center line M that is horizontally shown in Figures 3 and 4.

[0056] The rotor-side magnetic plate 42 in Fig. 5 is made of a ferromagnetic material such as iron, and is configured as a laminated iron plate 72 made by stacking multiple thin iron plates. By using laminated iron plate 72 in this way, a thin plate-like magnet layer is formed on the rotor-side magnetic plate 42, which causes more magnetic field disturbance than if it were configured from a single iron plate.

[0057] As the ferromagnetic material, in addition to iron, silicon iron (iron mixed with a small amount of silicon), perloy (an alloy mainly composed of nickel), etc. The fixed side magnetic plate 44 has a similar structure.

[0058] The rotor-side magnetic plate 42 of Fig. 6A has a laid-out magnet 74, which is a plurality of small, square, rod-shaped magnets 74A (permanent magnets) laid on the surface of the laminated iron plate 72 of Fig. 5. The plurality of magnets 74A that make up the laid-out magnet 74 are rod-shaped from the front side to the back side of Fig. 6A and are arranged along the rotor rotation direction A. In the laid-out magnet 74, the magnetic poles of adjacent magnets 74A on the laminated iron plate 72 side are alternately different. The fixed-side magnetic plate 44 has a similar configuration.

[0059] The rotor-side magnetic plate 42 of FIG. 6B is a modified example of the rotor-side magnetic plate 42 of FIG. 6A. FIG. 6B (A) is a perspective view of the rotor-side magnetic plate 42 attached to a bar magnet 66, FIG. 6B (B) is a plan view of FIG. 6B seen from the direction of arrow G, and FIG. 6B (C) is a side view of FIG. 6B seen from the direction of arrow H. As can be seen from these figures, the rotor-side magnetic plate 42 of FIG. 6B has multiple magnets 74A constituting the underlying magnets 74, each of which has a rod shape aligned along the rotor rotation direction A and is arranged perpendicular to the rotor rotation direction A. In other words, the underlying magnets 74 of the rotor-side magnetic plate 42 of FIG. 6B are rotated 90 degrees on the outer facing surface 66A of the bar magnet 66 compared to the underlying magnets 74 of the rotor-side magnetic plate 42 of FIG. 6A. The fixed-side magnetic plate 44 has a similar configuration.

[0060] 6, the rotor-side magnetic plate 42 in Fig. 7 has laid-out magnets 74, which are multiple small, square, rod-shaped magnets 74A (permanent magnets) laid on the surface of a laminated iron plate 72, but the magnets 74A are trapezoidal in shape. The fixed-side magnetic plate 44 has a similar configuration.

[0061] Here, like the magnet 74A shown in Fig. 6B, the magnet 74A may also be arranged so that its longitudinal direction faces the rotor rotation direction A. This results in the magnet 74A being arranged in a direction perpendicular to the rotor rotation direction A, similar to Fig. 6B.

[0062] By providing a laid magnet 74 consisting of multiple small square magnets 74A (permanent magnets) laid on the surface of a laminated iron plate 72, as in the rotor side magnetic plate 42 and fixed side magnetic plate 44 in Figures 6A, 6B and 7, the magnetic field becomes more disturbed than when only the laminated iron plate 72 is used.

[0063] Although not shown, in Figures 6A, 6B, and 7, magnetic or non-magnetic material can be interposed between adjacent magnets 74A of the laid-down magnet 74. For example, referring to (B) in Figure 6B, of the multiple magnets 74A of the laid-down magnet 74, the magnets 74A designated as S poles can be replaced with magnetic or non-magnetic material. In this case, the magnets 74A designated as N poles and magnetic or non-magnetic material are arranged alternately. Alternatively, of the multiple magnets 74A of the laid-down magnet 74, the magnets 74A designated as N poles can be replaced with magnetic or non-magnetic material. In this case, the magnets 74A designated as S poles and magnetic or non-magnetic material are arranged alternately.

[0064] 5 to 7, the length L of the overhang portion 42A of the rotor-side magnetic plate 42 and the length L of the overhang portion 44A of the fixed-side magnetic plate 44 are preferably set in relation to the width W (see FIG. 5) of the gaps 64, 68 between adjacent bar magnets 66. That is, as described above, considering the length L of the overhang portion 44A in relation to the fact that the width of the gaps 64, 68 is preferably one to two times the width W of the bar magnets 66, 70 in the rotor rotation direction A, it is preferable that the length L of the overhang portion 44A be approximately one-third to one-quarter of the width W of the bar magnet 66 in the rotor rotation direction A.

[0065] Next, the operation of the magnetic rotating device 16 according to the first embodiment of the present invention configured as described above will be described with reference to FIG.

[0066] Figure 8(A) shows a state in which the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40 are approaching each other due to the rotation of the rotor 34. Figure 8(B) shows a state in which the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40 are aligned in a straight line. Figure 8(C) shows a state in which the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40 are spaced apart. Note that, as a rotary drive source for rotating the rotor 34, for example, a motor 12 is used, as shown in Figure 1.

[0067] 8(A), when the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40 approach each other due to the rotation of the rotor 34, the magnetic field on the downstream side of the outer opposing surface 66A of the rotor-side magnet section 38 is disturbed by the rotor-side magnetic plate 42 when viewed from the rotor rotation direction A. Also, the magnetic field on the upstream side of the inner opposing surface 70A of the fixed-side magnet section 40 is disturbed by the fixed-side magnetic plate 44. As a result, when the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40 approach each other, a repulsive force is generated between the bar magnets 66, 70.

[0068] As shown in Figure 8 (B), the rotor 34 rotates with a repulsive force generated between the bar magnets 66, 70 until the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the fixed-side magnet section 40 become aligned.

[0069] 8(C), when the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the stator-side magnet section 40 separate from each other, the upstream surface of the outer opposing surface 66A of the rotor-side magnet section 38 that does not have the rotor-side magnetic plate 42 is exposed when viewed from the rotor rotation direction A, so the magnetic field on the upstream surface is not disturbed. Also, the downstream surface of the inner opposing surface 70A of the stator-side magnet section 40 that does not have the stator-side magnetic plate 44 is exposed, so the magnetic field on the downstream surface is not disturbed. As a result, when the bar magnet 66 of the rotor-side magnet section 38 and the bar magnet 70 of the stator-side magnet section 40 separate from each other, a repulsive force is generated between the upstream surface of the bar magnet 66 and the downstream surface of the bar magnet 70.

[0070] In this case, as explained in Figures 3 and 4, it is preferable to provide a rotor-side magnetic plate 42 on the downstream half of the bar magnet 66 of the rotor-side magnet section 38, and to provide a fixed-side magnetic plate 44 on the upstream half of the bar magnet 70 of the fixed-side magnet section 40.

[0071] As explained with reference to FIG. 2, the flywheel 46 is provided on the rotary shaft 28, so that the moment of inertia with which the rotor 34 rotates can be increased.

[0072] [Second embodiment of magnetic rotating device] As described in the magnetic rotating device 16 of the first embodiment of the present invention, there is a gap 64 (or gap 68) having a concave surface between adjacent bar magnets 66 (or bar magnets 70) of the rotor side magnet section 38 and the fixed side magnet section 40.

[0073] However, by having this gap 64 (or gap 68), as shown in Figures 3 and 4, the bar magnet 66 of the rotor-side magnet section 38 has all surfaces exposed except the outer facing surface 66A, i.e., the front surface 66B and rear surface 66C when viewed from the rotor rotation direction A. Similarly, the bar magnet 70 of the fixed-side magnet section 40 has all surfaces exposed except the inner facing surface 70A, i.e., the front surface 70B and rear surface 70C when viewed from the rotor rotation direction A.

[0074] Furthermore, although not due to gap 64 (or gap 68), left face 66D and right face 66E of bar magnet 66 that are perpendicular to rotor rotation direction A are also exposed. Similarly, left face 70D and right face 70E of bar magnet 70 that are perpendicular to rotor rotation direction A are also exposed.

[0075] In the magnetic rotating device 76 of the second embodiment of the present invention, the magnetic poles on the entire surface (all faces) of the rotor side magnet section 38 are made to have the same polarity as the outer magnetic poles, which are the magnetic poles of the outer opposing surface 66A, and the magnetic poles on the entire surface (all faces) of the fixed side magnet section 40 are made to have the same polarity as the inner magnetic poles, which are the magnetic poles of the inner opposing surface 70A.

[0076] 9A is a side view of a magnetic rotating device 76 according to a second embodiment of the present invention, with the rotor rotation direction A facing forward, and FIG. 9B is a front cross-sectional view taken along line bb in FIG. 9A. The same members as those in the magnetic rotating device 16 according to the first embodiment will be described with the same reference numerals.

[0077] 9A, in a magnetic rotating device 76 according to a second embodiment of the present invention, a first auxiliary magnet 78 is provided so that the magnetic pole of the concave surface of the gap 64 formed between adjacent bar magnets 66 of the rotor-side magnet section 38 has the same polarity as the outer magnetic pole, which is the magnetic pole of the outer facing surface 66A of the bar magnet 66. Similarly, a first auxiliary magnet 78 is provided so that the magnetic pole of the concave surface of the gap 68 formed between adjacent bar magnets 70 of the fixed-side magnet section 40 has the same polarity as the inner magnetic pole, which is the magnetic pole of the inner facing surface 70A of the bar magnet 70.

[0078] 9(B), in the bar magnet 66 of the rotor-side magnet section 38, a second auxiliary magnet 80 and a third auxiliary magnet 82 are provided on the left surface 66D and the right surface 66E as viewed from the rotor rotation direction A in FIGS. 3 and 4, so that they have the same polarity as the outer magnetic pole, which is the magnetic pole of the outer facing surface 66A of the bar magnet 66. Similarly, in the bar magnet 70 of the fixed-side magnet section 40, a second auxiliary magnet 80 and a third auxiliary magnet 82 are provided on the left surface 70D and the right surface 70E as viewed from the rotor rotation direction A in FIGS. 3 and 4, so that they have the same polarity as the inner magnetic pole, which is the magnetic pole of the inner facing surface 70A of the bar magnet 70.

[0079] The rotor-side magnet section 38 and the fixed-side magnet section 40 have the same mounting structure for mounting the first auxiliary magnet 78, second auxiliary magnet 80, and third auxiliary magnet 82 to the bar magnets 66, 70, so only the rotor-side magnet section 38 will be described in detail.

[0080] A first auxiliary magnet 78 is fitted and fixed in the bottom of the concave gap 64 between the bar magnets 66 of the rotor-side magnet section 38 with its north pole facing up (towards the outer facing surface 66A of the bar magnet 66). That is, of the north pole portion of the upper half of the bar magnet 66 and the south pole portion of the lower half, the front surface 66B and rear surface 66C of the south pole portion are hidden by the first auxiliary magnet 78 (see Figures 3 and 4). This makes the gap 64 the same as the outer magnetic pole (north pole) of the outer facing surface 66A of the bar magnet 66.

[0081] As shown in FIG. 9B, a second auxiliary magnet 80 and a third auxiliary magnet 82 are disposed between the bar magnet 66 and the pair of side covers 61, 61, via side plates 83 for securing the magnets. The side plates 83 are preferably made of a non-magnetic material such as stainless steel. The side plates 83 are supported by the cylindrical tube 50 of the rotor 34. In this case, the second auxiliary magnet 80 covers the north pole portion of the upper half of the bar magnet 66, which faces the outer facing surface 66A, and the south pole portion of the lower half, which faces the opposite side of the outer facing surface 66A. The left side 66D (see FIGS. 3 and 4) and the right side 66E (see FIGS. 3 and 4) of the south pole portion, as viewed from the rotor rotation direction A, are hidden by the second auxiliary magnet 80. Furthermore, the north pole of the second auxiliary magnet 80 faces the north pole of the bar magnet 66. In addition, the third auxiliary magnet 82 is positioned so as to hide the south pole portion of the second auxiliary magnet 80, and the direction of the north and south poles of the third auxiliary magnet 82 is perpendicular to the direction of the north and south poles of the second auxiliary magnet 80, i.e., the magnetization direction is parallel to the rotation axis 28.

[0082] This allows the left surface 66D and the right surface 66E of the S pole portion of the bar magnet 66 to be the same as the outer magnetic pole (N pole) of the outer opposing surface 66A of the bar magnet 66.

[0083] The purpose of the first auxiliary magnet 78, second auxiliary magnet 80, and third auxiliary magnet 82 is to ensure that the magnetic poles on the entire surface (all faces) of the rotor-side magnet section 38 have the same polarity as the outer magnetic pole, i.e., N pole. Therefore, as long as the exposed area of ​​the S pole in the rotor-side magnet section 38 is small, the arrangement of the first auxiliary magnet 78, second auxiliary magnet 80, and third auxiliary magnet 82 is not limited to the arrangement example shown in Figure 9(B).

[0084] The above detailed explanation is about the mounting structure of the first auxiliary magnet 78, second auxiliary magnet 80, and third auxiliary magnet 82 arranged in the rotor-side magnet section 38, but the same applies to the fixed-side magnet section 40. This makes it possible to extremely reduce the exposed area of ​​the south pole in the rotor-side magnet section 38 and the fixed-side magnet section 40.

[0085] Figure 10 is a partially enlarged front cross-sectional view of a modified example of the magnetic rotating device 76 of the second embodiment of the present invention shown in Figure 9. In addition to the second auxiliary magnet 80 and the third auxiliary magnet 82, a fourth auxiliary magnet 84 and a ferromagnetic plate 86 are provided on the left faces 66D, 70D and the right faces 66E, 70E of the bar magnets 66, 70.

[0086] 10, the arrangement of the second auxiliary magnet 80 is the same as in FIG. 9, but the south pole portion of the second auxiliary magnet 80 is hidden by a ferromagnetic plate 86 (e.g., an iron plate), and the third auxiliary magnet 82 and the fourth auxiliary magnet 84 are provided so that their south poles face the ferromagnetic plate 86. In addition, the ferromagnetic plate 86, the third auxiliary magnet 82, and the fourth auxiliary magnet 84 are fixed to one another by a side plate 83.

[0087] However, if the magnetic poles of the entire surface (all faces) of the rotor side magnet section 38 are made to have the same polarity as the outer magnetic pole, and if the magnetic poles of the entire surface (all faces) of the fixed side magnet section 40 are made to have the same polarity as the inner magnetic pole, there is a risk that the bar magnets 66, 70 will become misaligned.

[0088] Therefore, as shown in Figure 11, the gaps 64 between the bar magnets 66 of the rotor-side magnet section 38 and the gaps 68 between the bar magnets 70 of the fixed-side magnet section 40 are filled with a filler 88 of a non-magnetic material (e.g., plastic). This makes it less likely that misalignment will occur between the bar magnets 66, 70. In this case, it is preferable to fill not only the gaps 64 between the bar magnets 66 of the rotor-side magnet section 38 and the gaps 68 between the bar magnets 70 of the fixed-side magnet section 40, but also the spaces between the rotor-side magnetic plates 42 arranged in the rotational direction with the filler 88 of a non-magnetic material (e.g., plastic) (see Figures 11, 8, etc.). Similarly, it is preferable to fill the spaces between the fixed-side magnetic plates 44 arranged in the rotational direction with the filler 88 of a non-magnetic material (e.g., plastic) (see Figures 11, 8, etc.).

[0089] 11, it is preferable to provide a rotor-side band 96 that presses the outer opposing surfaces 66A of the multiple bar magnets 66 (bar magnets 66 with rotor-side magnetic plates 42 provided) that make up the circular rotor-side magnet section 38 against the cylindrical tube 50. The rotor-side band 96 is formed of a cylindrical, hard material that is non-magnetic (e.g., stainless steel or plastic), and both ends of the rotor-side band 96 in the width direction are fixed to the side cover 52. This makes it possible to prevent the bar magnets 66 from peeling off from the cylindrical tube 50, even when the bar magnets 66 are fixed to the cylindrical tube 50 made of a ferromagnetic material only by magnetic force.

[0090] Similarly, it is preferable to provide a fixed-side band 98 that presses the inner opposing surfaces 70A of the multiple bar magnets 70 (bar magnets 70 with fixed-side magnetic plates 44 provided) that make up the circular fixed-side magnet section 40 against the inner cylinder 58. The fixed-side band 98 is similar to the rotor-side band 96 and is formed from a cylindrical hard material such as a non-magnetic material (e.g., stainless steel or plastic), and both widthwise ends of the fixed-side band 98 are fixed to the side cover 61 described above.

[0091] In this way, by filling the gaps 64, 68 with the filler 88 and providing the rotor side band 96 and the fixed side band 98, it is possible to reliably prevent the bar magnet 70 from shifting out of position or peeling off from the inner cylinder 58, even when the bar magnet 70 is fixed to the inner cylinder 58 made of a ferromagnetic material by magnetic force alone.

[0092] 11, it is preferable to fill the filler 88 so that the gaps 64, 68 are completely filled with the filler 88, that is, so that the filler 88 is flush with the outer facing surface 66A of the bar magnet 66 and the inner facing surface 70A of the bar magnet 70. This prevents gaps from occurring between the rotor side band 96 and the filler 88, allowing the rotor side band 96 and the rotor side band 96 to be firmly fixed.

[0093] [Third embodiment of magnetic rotating device] FIG. 12 is a front cross-sectional view of a magnetic rotating device 90 according to a third embodiment of the present invention, and the same components as those in the magnetic rotating device 16 according to the first embodiment and the magnetic rotating device 76 according to the second embodiment will be described using the same reference numerals.

[0094] A magnetic rotating device 90 according to a third embodiment of the present invention uses a flywheel 92 as the rotor 34 of the rotor-side magnet section 38, which has a diameter larger than the rotor diameter and can increase the moment of inertia in the rotor rotation direction A.

[0095] 12, the center of a disk-shaped flywheel 92 is fitted and supported on the rotating shaft 28, and the cylindrical tube 50 described above is fixed to the outer periphery of the flywheel 92. The other configurations are the same as those of the magnetic rotating device 76 of the second embodiment.

[0096] Thus, the magnetic rotating device 90 of the third embodiment of the present invention uses a flywheel 92 as the rotor 34 in addition to the configuration of the rotor side magnetic plate 42 and the fixed side magnetic plate 44, and the configuration of the first auxiliary magnet 78, the second auxiliary magnet 80, and the third auxiliary magnet 82.

[0097] The magnetic rotating device 90 of the third embodiment shown in FIG. 12 is obtained by replacing the rotor 34 of the magnetic rotating device 76 of the second embodiment of the present invention with a flywheel 92, but the rotor 34 of the magnetic rotating device 16 of the first embodiment of the present invention may also be replaced with a flywheel 92.

[0098] [Fourth embodiment of magnetic rotating device] FIG. 13 is a front cross-sectional view of a magnetic rotating device 94 according to a fourth embodiment of the present invention, which is configured by connecting a plurality of magnetic rotating devices according to the present invention described above in series.

[0099] The magnetic rotating device 94 of the fourth embodiment of the present invention can be variously combined with the magnetic rotating device 16 of the first embodiment, the magnetic rotating device 76 of the second embodiment, and the magnetic rotating device 90 of the third embodiment. In Fig. 13, one magnetic rotating device 76 of the second embodiment and two magnetic rotating devices 90 of the third embodiment are combined.

[0100] The magnetic rotating devices 16, 76, 90, 94 of the present invention and the power generating device 10 incorporating them have been described above, but the magnetic rotating devices incorporated into the power generating device 10 can also incorporate various combinations of the magnetic rotating devices 16, 76, 90, 94 of the first, second, third, and fourth embodiments described above.

[0101] According to the magnetic rotating device 94 of the fourth embodiment of the present invention, multiple magnetic rotating devices 76, 90 are connected in series, but the same effect can be obtained by arranging multiple bar magnets 66, 70 in the axial direction of the rotating shaft 28 in one magnetic rotating device 16, 76, 90 described in the first to third embodiments.

[0102] For example, a plurality (for example, three) of bar magnets 66, 70 (provided with rotor-side magnetic plate 42 and fixed-side magnetic plate 44) shown in FIG. 2B and FIG. 9B are arranged in the axial direction of the rotary shaft 28.

[0103] Fig. 14 is an overall configuration diagram of a power generating device 10 according to a fifth embodiment of the present invention, with Fig. 14A being a configuration diagram showing the motor section, Fig. 14B being a configuration diagram showing the magnetic rotating device 100, and Fig. 14C being a configuration diagram showing details of each part of the generator section. The basic structure of the magnetic rotating device 100 is similar to that of the magnetic rotating devices 16, 76, 90, and 94. In the fifth embodiment, the inner ring rotor corresponding to the inner cylinder 58 and rotor-side magnet section 38 of the magnetic rotating devices 16, 76, 90, and 94 of the first to fourth embodiments rotates, and the outer cylinder 56 and fixed-side magnet section 40 are fixed, whereas the outer ring rotor corresponding to the outer cylinder 56 and fixed-side magnet section 40 is made rotatable.

[0104] The power generating device 10 is mainly composed of a motor 12, a generator 14 that generates electricity by rotating a generator rotor 14A using the motor 12 as a rotational drive source, and a magnetic rotating device 100 of the present invention that is provided between the motor 12 and the generator rotor 14A. The motor 12 is supported on a base 18 via a motor mounting base 22, and the generator 14 is supported on the base 18 via a generator mounting base 24, with the motor transmission unit 110 and rotor transmission unit 140 supported on the base 18.

[0105] As shown in Fig. 14A, rotating shaft 12A of motor 12 and one end of stepped shaft 130, which passes through the motor section, magnetic rotating device 100, and generator section, on the motor section side are connected by coupling 30. In the motor section, stepped shaft 130 is rotatably supported from base 18 by magnetic bearings 126 and 127. A pulley 112 is fixed to stepped shaft 130 between magnetic bearing 126 and coupling 30. A coupling 230 is provided between magnetic bearing 126 and magnetic bearing 127, allowing connection and release between rotating shaft 12A of motor 12 and stepped shaft 130. A disc brake 115 fixed to base 18 is provided between magnetic bearing 127 and magnetic rotating device 100, allowing connection and release of stepped shaft 130.

[0106] The hollow shaft 131 is disposed with a gap between it and the stepped shaft 130, and is rotatably supported by a magnetic bearing 128 on the base 18. A disc brake 118 fixed to the base 18 is provided on the motor 12 side of the hollow shaft 131, allowing the hollow shaft 131 to be locked and unlocked. A pulley 114 is fixed to the hollow shaft 131 between the disc brake 118 and the magnetic bearing 128.

[0107] In the motor transmission unit 110, a stepped shaft 119 is rotatably supported by magnetic bearings 116 and 117 on a base 18. At one end of the stepped shaft 119 on the motor 12 side, pulley 111 is arranged opposite pulley 112, and power is transmitted between the stepped shaft 119 and a stepped shaft 130 via a belt (not shown). At one end of the stepped shaft 119 on the magnetic rotating device 100 side, pulley 113 is arranged opposite pulley 114, and power is transmitted between the stepped shaft 119 and a hollow shaft 131 via a belt (not shown). Note that power transmission may be performed using gears instead of a belt (not shown).

[0108] As shown in FIG. 14B, the magnetic rotating device 100 has a similar configuration to the magnetic rotating devices 16, 76, 90, and 94, and only the differences will be described. For example, the inner ring magnet portion 136 of the magnetic rotating device 100 corresponds to the rotor-side magnet portion 38 of the magnetic rotating device 76 and is fixed to the stepped shaft 130 with a key groove 137. An inner ring flywheel 133 is fixed to the stepped shaft 130 with a key groove 138, forming the inner ring rotor. The outer ring magnet portion 135 corresponds to the fixed-side magnet portion 40 and is fixed to the outer ring cover band 134. Furthermore, the rotor-side magnetic plate 42 of the magnetic rotating device 76 corresponds to the magnetic plate of the inner ring magnet portion 136, and the fixed-side magnetic plate 44 corresponds to the magnetic plate of the outer ring magnet portion 135. The outer ring cover band 134 and the hollow shaft 131 are fixed via the outer ring flywheel 132, forming the outer ring rotor. The outer flywheel 132 and the inner flywheel 133 are provided on both sides of the inner magnet portion 136 and the outer magnet portion 135 in the axial direction.

[0109] The outer ring weight plate 235 is attached to the outer ring cover band 134 so as to compensate for the mass of the outer ring flywheel 132. Since the outer ring weight plate 235 also serves as the outer ring flywheel 132, it is preferable that it be wrapped with a non-magnetic material, for example, a non-magnetic stainless steel band.

[0110] As shown in Fig. 14C, the rotating shaft 14B of the power generating rotor 14A of the generator 14 and one end of the stepped shaft 130 on the generator unit side are connected by a joint 30. In the generator unit, the stepped shaft 130 is rotatably supported from the base 18 by magnetic bearings 145 and 146. A pulley 141 is fixed to the stepped shaft 130 between the magnetic bearing 145 and the joint 30. A joint 232 is provided between the magnetic bearings 145 and 146, allowing the stepped shaft 130 and the rotating shaft 14B to be connected and disconnected. A disc brake 148 fixed to the base 18 is provided between the magnetic bearing 146 and the magnetic rotating device 100, allowing the stepped shaft 130 to be connected and disconnected.

[0111] The generator side of the hollow shaft 131 is arranged with a gap between it and the stepped shaft 130, similar to the motor 12 side, and is rotatably supported by a magnetic bearing 147 on the base 18. A disc brake 149 fixed to the base 18 is provided on the generator 14 side of the hollow shaft 131, allowing the hollow shaft 131 to be fixed and released. A pulley 143 is fixed to the hollow shaft 131 between the disc brake 149 and the magnetic bearing 147.

[0112] In rotor transmission unit 140, hollow shaft 131 is rotatably supported by magnetic bearings 150 and 151 on base 18. At one end of stepped shaft 152 on the generator 14 side, pulley 142 is arranged opposite pulley 141, and power is transmitted between stepped shaft 130 and the stepped shaft 130 via a belt (not shown). At one end of stepped shaft 152 on the magnetic rotating device 100 side, pulley 144 is arranged opposite pulley 143, and power is transmitted between stepped shaft 152 and hollow shaft 131 via a belt (not shown).

[0113] The following mainly describes the procedure for rotating the outer ring rotor, which is made up of outer ring magnet section 135 and outer ring flywheel 132. (1) Joint 230 on the motor side and joint 232 on the generator side are released. (2) Disc brake 115 and disc brake 148 are activated, and stepped shaft 130 is fixed, thereby fixing the inner ring rotor, which is made up of inner ring magnet section 136 and inner ring flywheel 133. (3) Disc brake 118 and disc brake 149 are released, allowing the outer ring rotor to rotate.

[0114] The rotation of the rotary shaft 12A driven by the motor 12 is transmitted to the pulley 111 via the joint 30, the pulley 112, and a belt (not shown). The rotation of the pulley 111 is transmitted to the pulley 114 via the pulley 113 and a belt (not shown), causing the hollow shaft 131 to rotate. The rotation of the hollow shaft 131 causes the outer ring rotor, which is composed of the outer ring magnet portion 135 and the outer ring flywheel 132, to rotate.

[0115] The rotation of the outer rotor is transmitted to pulley 144 and pulley 142 of rotor transmission unit 140 via pulley 143 fixed to hollow shaft 131 and a belt (not shown). The rotation of pulley 142 is transmitted to pulley 141 via a belt (not shown), and then to rotating shaft 14B and power-generating rotor 14A to drive power generator 14. As described above, power generator 10 in which the outer rotor rotates is configured.

[0116] In the fifth embodiment, it is also possible to fix the outer rotor and rotate the inner rotor, as follows: (1) Fix joint 230 on the motor side and joint 232 on the generator side. (2) Fix disc brake 118 and disc brake 149 to prevent rotation of the outer rotor. (3) Release disc brake 115 and disc brake 148 to allow stepped shaft 130 to rotate, thereby allowing rotation of the inner rotor formed by inner magnet section 136 and inner flywheel 133. (4) Remove the belts (not shown) that transmit rotation from pulley 112 to pulley 111 and from pulley 142 to pulley 141.

[0117] Rotation of the rotating shaft 12A driven by the motor 12 is transmitted to the stepped shaft 130 via the joint 30, the pulley 112, and the joint 230. The inner rotor, which is composed of the inner magnet section 136 and the inner flywheel 133, rotates as the stepped shaft 130 rotates. On the other hand, the outer rotor, which is composed of the outer magnet section 135 and the outer flywheel 132, is fixed because the disc brake 118 and the disc brake 149 are fixed, and functions similarly to the outer cylinder 56 and the fixed-side magnet section 40 of the magnetic rotating devices 16, 76, 90, and 94. Note that the fifth embodiment uses magnetic bearings 126, 127, 128, 116, 117, 147, 146, 145, 150, and 151 to reduce friction and improve efficiency, but if the effect of friction is small, the power generating device may be configured using normal radial bearings.

[0118] 15 and 16 show the case where magnetic bearings 126, 127, 128, 116, 117, 147, 146, 145, 150, and 151 are configured with magnet sections. FIG. 15 is a side cross-sectional view of the magnetic bearing in the fifth embodiment, and FIG. 16 is a front cross-sectional view of the magnetic bearing in the fifth embodiment. The basic structure is similar to that of the magnetic rotating device 76 of the second embodiment (the configuration in FIG. 10), and detailed description will be omitted, but the structure is mainly composed of a rotor-side magnet section 38, a fixed-side magnet section 40, a rotor-side magnetic plate 42, and a fixed-side magnetic plate 44. The fixed-side magnet section 40 is the fixed side, and the rotor-side magnet section 38 is the rotating side that fits onto the stepped shaft 130, the stepped shaft 119, the hollow shaft 131, and the stepped shaft 152.

[0119] The bar magnet 66 constitutes the rotor-side magnet section 38, and the bar magnet 70 constitutes the fixed-side magnet section 40. A second auxiliary magnet 80, a third auxiliary magnet 82, and a fourth auxiliary magnet 84 are provided on the left and right sides of the bar magnets 66 and 70. The fixed-side magnet section 40 is fixed by fixed-side bands 160, 161, and 162 made of a cylindrical hard material such as non-magnetic material (e.g., stainless steel or plastic). The rotor-side magnet section 38 is fixed by rotor-side bands 170, 171, and 172 similar to the fixed-side bands 160, 161, and 162.

[0120] FIG. 17 shows a modified example of the fifth embodiment, with FIG. 17(a) being a diagram of the motor section and FIG. 17(b) being a diagram of the generator section. In the motor section, the rotating shaft 12A of the motor 12 is elongated and supported at both ends by magnetic bearings 153 and 154. Similarly, in the generator section, the rotating shaft 14B of the generator rotor 14A is elongated and supported at both ends by magnetic bearings 155 and 156. The basic structures of the magnetic bearings 153, 154, 155, and 156 are the same as those shown in FIGS. 15 and 16. This enables high-speed rotation, eliminates frictional resistance, and further improves efficiency. If the rotating shaft 12A is not elongated, the magnetic bearings 153 and 154 can be configured to be supported at both ends inside the motor 12. Similarly, if the rotating shaft 14B is not elongated, the magnetic bearings 155 and 156 can be configured to be supported at both ends inside the generator 14. [Explanation of symbols]

[0121] 10... power generating device, 12... motor, 12A... rotating shaft, 14... generator, 14A... power generating rotor, 14B... rotating shaft, 16, 76, 90, 94... magnetic rotating device, 18... base, 18A... vibration damping member, 18B... fixing bolt, 20... device frame, 22... motor mounting base, 24... generator mounting base, 26... bearing, 28... rotating shaft, 30... joint, 32... brake means, 34... rotor, 34A...rotor main body, 34B...fitting tube, 34C...outer ring tube, 36...fixed portion, 38...rotor side magnet portion, 40...fixed side magnet portion, 42...rotor side magnetic plate, 42A...eaves portion, 44...fixed side magnetic plate, 44A...eaves portion, 46...flywheel, 48...shaft collar, 50...cylindrical tube, 52...side cover, 54...connecting bolt, 56...outer tube, 58...inner tube, 58A...arcuate block plate, 60...connecting bolt, 61...side cover, 62...connection adjustment bolt, 63...connecting bolt, 64...gap portion, 65...washer, 66...bar magnet (first bar magnet), 66A...outer facing surface, 66B...front surface, 66C...rear surface, 66D...left surface, 66E...right surface, 66F...bottom surface, 67...step surface, 68...gap portion, 70...bar magnet (second bar magnet), 70A...inner facing surface, 70B...front surface, 70C ...rear surface, 70D...left surface, 70E...right surface, 70F...bottom surface, 71...step surface, 72...laminated iron plate, 74...laying magnet, 74A...magnet, 78...first auxiliary magnet, 80...second auxiliary magnet, 82...third auxiliary magnet, 83...side plate, 84...fourth auxiliary magnet, 86...ferromagnetic plate, 88...filler, 92...flywheel, 96...rotor side band, 98...fixed side band, A...rotor rotation direction, M,P...center line, 100...magnetic rotating device, 110...motor transmission part, 111...pulley, 112...pulley, 113...pulley, 114...pulley, 115...disc brake, 116...magnetic bearing, 117...magnetic bearing, 118...disc brake, 119...stepped shaft, 126...magnetic bearing, 127...magnetic bearing, 128...magnetic bearing, 130...stepped shaft, 131...hollow shaft, 132...outer ring flywheel, 133...inner ring flywheel, 134...outer ring cover band, 135...outer ring magnet part, 136...inner ring magnet part, 137...key groove, 138...key groove, 140...rotor transmission part, 141...pulley, 142...pulley, 143...pulley, 144...pulley, 145...magnetic bearing, 146...magnetic bearing, 147...magnetic bearing, 148...disc brake, 149...disc brake, 150...magnetic bearing, 151...magnetic bearing, 152...stepped shaft, 153...magnetic bearing, 154...magnetic bearing, 155...magnetic bearing, 156...magnetic bearing, 160...fixed side band, 161...fixed side band, 162...fixed side band, 170...rotor side band, 171...rotor side band, 172...rotor side band, 230...joint, 232...joint, 235...outer ring weight plate

Claims

1. In a magnetic rotating device that uses the magnetic force of a magnet as a rotational force, a hollow shaft rotatably supported around a stepped shaft having a keyway as a step; an outer ring cover band fixed to the hollow shaft and rotating about the axis of the hollow shaft; an outer ring magnet portion fixed to the outer ring cover band; an inner ring magnet section consisting of a plurality of first bar magnets, the first bar magnets being arranged on the stepped shaft with equally spaced gaps formed along the rotation direction of the stepped shaft, the magnetization directions of the first bar magnets being aligned along a radial direction perpendicular to the axis of the hollow shaft, and the outer magnetic poles of the first bar magnets on the outer side in the radial direction all having the same polarity; the outer ring magnet portion is composed of a plurality of second bar magnets, the second bar magnets are arranged on the inner peripheral surface of the outer ring cover band at equally spaced intervals in the circumferential direction, the magnetization directions of the second bar magnets are aligned along a radial direction perpendicular to the axis of the hollow shaft, and the inner magnetic pole of the second bar magnets facing the inner ring magnet portion has the same polarity as the outer magnetic pole of the first bar magnet; Equipped with a magnetic plate on the inner ring magnet portion side is provided on the downstream surface of the outer ring magnet portion, which is the surface of the first bar magnet of the inner ring magnet portion facing the second bar magnet of the outer ring magnet portion, as viewed from the rotation direction of the outer ring cover band; a magnetic plate on the outer ring cover band side is provided on the upstream surface of the inner opposing surface of the second bar magnet of the outer ring magnet portion, which is the opposing surface of the first bar magnet of the inner ring magnet portion, as viewed from the rotation direction of the outer ring cover band; The magnetic poles of the concave surfaces of the gaps formed between the adjacent first bar magnets of the inner ring magnet section are of the same polarity as the outer magnetic poles, which are the magnetic poles of the outer opposing surfaces of the first bar magnets of the inner ring magnet section, and A first auxiliary magnet is provided so that the magnetic pole of the concave surface of the gap formed between the adjacent second bar magnets of the outer ring magnet portion has the same polarity as the inner magnetic pole, which is the magnetic pole of the inner opposing surface of the second bar magnet, and second auxiliary magnets of the inner ring magnet section are provided on the left and right faces, as viewed from the direction of rotation of the outer ring cover band, so as to hide the magnetic pole portion of the first bar magnet opposite to the outer magnetic pole; and the second auxiliary magnets of the inner ring magnet section are arranged so that their magnetization directions are aligned along the radial direction and that all of the outer magnetic poles in the radial direction have the same polarity as the outer magnetic poles; The second auxiliary magnets of the outer ring magnet section are provided on the left and right faces of the outer ring cover band as viewed from the direction of rotation so as to hide the magnetic pole portion of the second bar magnet opposite to the inner magnetic pole, and the second auxiliary magnets of the outer ring magnet section are arranged so that their magnetization directions are aligned along the radial direction and all of the inner magnetic poles in the radial direction have the same polarity as the inner magnetic poles, A third auxiliary magnet of the inner ring magnet part is provided on the left and right faces as viewed from the direction of rotation of the outer ring cover band so as to hide at least the magnetic pole portion of the radially inner magnetic pole of the second auxiliary magnet of the inner ring magnet part, and the magnetization direction of the third auxiliary magnet of the inner ring magnet part is parallel to the cavity axis, and when the third auxiliary magnet of the inner ring magnet part is arranged on the left face, a magnetic pole portion of the same polarity as the outer magnetic pole is arranged on the left face side, and when arranged on the right face, a magnetic pole portion of the same polarity as the outer magnetic pole is arranged on the right face side, A magnetic rotating device in which a third auxiliary magnet of the outer ring magnet part is provided on the left and right faces when viewed from the direction of rotation of the outer ring cover band so as to hide at least the magnetic pole portion of the radially outer magnetic pole of the second auxiliary magnet, and the magnetization direction of the third auxiliary magnet of the outer ring magnet part is parallel to the cavity axis, and when the third auxiliary magnet of the outer ring magnet part is positioned on the left face, a magnetic pole portion of the same polarity as the inner magnetic pole is arranged on the left face side, and when positioned on the right face, a magnetic pole portion of the same polarity as the inner magnetic pole is arranged on the right face side.

2. 2. The magnetic rotating device according to claim 1, wherein the outer ring cover band and the hollow shaft are fixed via an outer ring flywheel to form an outer ring rotor.

3. 3. The magnetic rotating device according to claim 2, wherein the outer ring flywheels are provided on both sides of the outer ring magnet portion in the axial direction.

4. a disc brake that can fix and release the stepped shaft; Furthermore, The magnetic rotating device according to claim 1, wherein the stepped shaft fixes the inner ring magnet portion, is positioned with a gap between it and the hollow shaft, is rotatably supported from a base, and operates the disc brake to rotate an outer ring rotor composed of the outer ring magnet portion and an outer ring flywheel.

5. A motor; a generator that generates electricity by rotating a generator rotor using the motor as a rotational drive source; the magnetic rotating device according to claim 4, which is provided between the motor and the power generating rotor; a disc brake that can lock and release the hollow shaft; a coupling that enables connection and release between the rotary shaft of the motor and the stepped shaft; a disc brake that can fix and release the stepped shaft; a coupling that enables connection and disconnection between the rotating shaft of the power generation rotor and the stepped shaft; A power generating device equipped with the above.

6. The power generating device according to claim 5, The bearings supporting the hollow shaft and the stepped shaft are configured to: a stepped shaft-side magnet portion consisting of a plurality of first bar magnets arranged on the stepped shaft to form equally spaced gaps along the rotation direction of the stepped shaft, the magnetization directions of the first bar magnets aligned along a radial direction perpendicular to the axis of the rotation shaft, and the outer magnetic poles of the first bar magnets on the outer side in the radial direction all having the same polarity; a hollow shaft-side magnet portion consisting of a plurality of second bar magnets, the second bar magnets being arranged on the inner circumferential surface on the shaft side of the hollow shaft with equally spaced gaps in the circumferential direction, the magnetization directions of the second bar magnets being aligned along a radial direction perpendicular to the axis of the rotation shaft, and the inner magnetic pole of the second bar magnets facing the stepped shaft-side magnet portion being arranged so as to have the same polarity as the outer magnetic pole of the first bar magnet; a stepped shaft-side magnetic plate is provided on the downstream surface, as viewed from the rotation direction of the stepped shaft, of an outer opposing surface of the first bar magnet of the stepped shaft-side magnet portion, which is an opposing surface of the second bar magnet of the hollow shaft-side magnet portion; a hollow shaft-side magnetic plate is provided on an upstream surface of an inner opposing surface of the second bar magnet of the hollow shaft-side magnet portion, which is an opposing surface of the first bar magnet of the stepped shaft-side magnet portion, as viewed from the rotation direction of the hollow shaft; The magnetic pole of the concave surface of the gap formed between the adjacent first bar magnets of the stepped shaft side magnet section has the same polarity as the outer magnetic pole, which is the magnetic pole of the outer facing surface of the first bar magnet of the stepped shaft side magnet section, and a first auxiliary magnet is provided so that the magnetic pole of the concave surface of the gap formed between the adjacent second bar magnets of the hollow shaft side magnet section has the same polarity as the inner magnetic pole, which is the magnetic pole of the inner opposing surface of the second bar magnet of the hollow shaft side magnet section; second auxiliary magnets on the stepped shaft side are provided on the left and right faces, as viewed from the direction of rotation of the hollow shaft, so as to hide the magnetic pole portion of the first bar magnet opposite to the outer magnetic pole, and the second auxiliary magnets on the stepped shaft side are arranged so that their magnetization directions are aligned along the radial direction and all of the outer magnetic poles in the radial direction have the same polarity as the outer magnetic poles; second auxiliary magnets on the hollow shaft side are provided on the left and right faces, as viewed from the direction of rotation of the hollow shaft, of the second bar magnet so as to hide the magnetic pole portion opposite to the inner magnetic pole, and the second auxiliary magnets on the hollow shaft side are arranged so that their magnetization directions are aligned along the radial direction and all of the inner magnetic poles in the radial direction have the same polarity as the inner magnetic poles; a third auxiliary magnet on the rotor side is provided on the left and right faces as viewed from the direction of rotation of the hollow shaft so as to conceal at least the magnetic pole portion of the radially inner magnetic pole of the second auxiliary magnet on the stepped shaft side, the magnetization direction of the third auxiliary magnet on the stepped shaft side is parallel to the rotation axis, and when the third auxiliary magnet on the stepped shaft side is arranged on the left face, a magnetic pole portion of the same polarity as the outer magnetic pole is arranged on the left face, and when the third auxiliary magnet on the stepped shaft side is arranged on the right face, a magnetic pole portion of the same polarity as the outer magnetic pole is arranged on the right face, a third auxiliary magnet on the hollow axis side is provided on the left and right faces as viewed from the rotation direction of the hollow axis so as to conceal at least the magnetic pole portion of the outer magnetic pole in the radial direction of the second auxiliary magnet on the hollow axis side, the magnetization direction of the third auxiliary magnet on the hollow axis side is parallel to the rotation axis, and when the third auxiliary magnet on the hollow axis side is positioned on the left face, a magnetic pole portion of the same polarity as the inner magnetic pole is arranged on the left face side, and when it is positioned on the right face, a magnetic pole portion of the same polarity as the inner magnetic pole is arranged on the right face side.

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