Rotating Equipment

Abstract

To provide a rotary apparatus capable of achieving a request of miniaturization.SOLUTION: In a rotary apparatus 1, each magnet 31 is formed by resin, a rotor 32 has a length of a radial direction, which is smaller than that of an axial direction, each outer peripheral surface of a first bearing 41 and a second bearing 42 contacts to an inner peripheral surface of the rotor 32, each inner peripheral surface of the first bearing 41 and the second bearing 42 contacts to the outer peripheral surface of a shaft member 5, and the shaft member 5 and the rotor 32 are formed by a single member, respectively. In the axial direction, an external diameter of the shaft member 5 is substantially the same from a part opposite to the first bearing 41 to a part opposite to the second bearing 42. Similarly, an inner diameter and an external diameter of the rotor 32 are substantially the same from an end part of the rotor 32 on the first bearing 41 side to the end part on the second bearing 42 side, respectively. One of stators 2 is arranged at a central part C1 of the shaft member 5 in the axial direction, and one of the magnets 31 is arranged at a central part C2 of the rotor 32 in the axial direction. The first bearing 41 and the second bearing 42 are arranged at both end part sides of the rotor 32.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to rotating equipment. [Background technology]

[0002] Traditionally, various rotating devices (a general term for motors themselves and devices that use the rotation generated by motors) have been developed, manufactured, and used in response to various applications and required performance. Among these, there is a strong demand for high-speed rotation and compact size for rotating devices used as air blowers. In addition, there is also a demand for high torque and compact size for various other applications. In other words, there is a demand for rotating devices that are compact yet can achieve high performance as rotating devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-64800 A Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a rotating device that can meet the demand for miniaturization. [Means for solving the problem]

[0005] The above-mentioned problems are solved by the present invention. That is, one aspect of a rotating device of the present invention is a rotating device including a shaft member as a stationary part, A cylindrical rotor rotatable relative to the shaft member; a first bearing and a second bearing that support the rotating body relative to the shaft member; A single or multiple stators located inside the rotor; A single or multiple cylindrical magnets fixed to the inner circumferential surface of the rotor; Equipped with The magnet is made of resin, The rotor has a radial length that is smaller than its axial length, an outer circumferential surface of the first bearing and an outer circumferential surface of the second bearing are in contact with an inner circumferential surface of the rotating body, an inner circumferential surface of the first bearing and an inner circumferential surface of the second bearing are in contact with an outer circumferential surface of the shaft member, the shaft member and the rotor are each formed of a single member, In the axial direction, an outer diameter of the shaft member is substantially the same from a portion facing the first bearing to a portion facing the second bearing, In the axial direction, the inner diameter and the outer diameter of the rotating body are substantially the same from the end of the rotating body on the first bearing side to the end of the rotating body on the second bearing side, the single stator or one of the plurality of stators is disposed in a central portion of the shaft member in an axial direction; the single magnet or one of the plurality of magnets is disposed at a central portion of the rotor in an axial direction; The first bearing and the second bearing are disposed on both end sides of the rotating body.

[0006] In the rotating device according to the above aspect of the present invention, the rotating body may be formed of a non-magnetic material, or may be formed of a metal material. In the rotating device according to the above aspect of the present invention, the number of the plurality of stators and the number of the plurality of magnets are each odd numbers, The plurality of stators are arranged on the shaft member at equal intervals in the axial direction, and one of the plurality of stators is arranged in a central portion of the shaft member, The plurality of magnets may be arranged in the axial direction at equal intervals on the rotating body, and one of the plurality of magnets may be arranged in a central portion of the rotating body. In the rotating device according to the above aspect of the present invention, the number of the stators is plural, The coils of the plurality of stators may be electrically connected in parallel.

[0007] In the above aspect of the rotating device of the present invention, the outer circumferential surface of the rotor may be provided with one or more openings penetrating the rotor from inside to outside, and in this case, it is preferable that at least one of the openings is located between the magnet and the first bearing in the axial direction. Furthermore, when the outer circumferential surface of the rotor is provided with a plurality of openings, it is preferable that at least one of the openings is located between the magnet and the second bearing in the axial direction.

[0008] In the above aspect of the rotating device of the present invention, one or more rotor blades may be provided inside the rotor, and when a plurality of rotor blades are provided, it is preferable that the stator is disposed between the plurality of rotor blades in the axial direction of the shaft member. Also, the single rotor blade or any of the plurality of rotor blades may face the first bearing at least partially in the axial direction of the shaft member. In addition, in the above-mentioned aspect of the rotating device of the present invention, a preload may be applied to an inner ring of either the first bearing or the second bearing, the inner ring being fixed to the shaft member, in a direction toward the other bearing.

[0009] On the other hand, another aspect of the rotating device of the present invention is a rotating device including a shaft member as a stationary part, A cylindrical rotor rotatable relative to the shaft member; a first bearing and a second bearing that support the rotating body relative to the shaft member; A plurality of stators disposed inside the rotor; A plurality of cylindrical magnets fixed to an inner circumferential surface of the rotor; Equipped with The cylindrical magnet is made of resin, The rotor has a radial length that is smaller than its axial length, an outer circumferential surface of the first bearing and an outer circumferential surface of the second bearing are in contact with an inner circumferential surface of the rotating body, an inner circumferential surface of the first bearing and an inner circumferential surface of the second bearing are in contact with an outer circumferential surface of the shaft member, the shaft member and the rotor are each formed of a single member, In the axial direction, an outer diameter of the shaft member is substantially the same from a portion facing the first bearing to a portion facing the second bearing, In the axial direction, the inner diameter and the outer diameter of the rotating body are substantially the same from the end of the rotating body on the first bearing side to the end of the rotating body on the second bearing side, Two of the plurality of stators are disposed on both sides of a center portion of the shaft member in an axial direction, Two of the plurality of magnets are disposed on both sides of a center portion of the rotor in an axial direction, The first bearing and the second bearing are disposed on both end sides of the rotating body.

[0010] In the rotating device according to the above aspect of the present invention, the rotating body may be formed of a non-magnetic material, or may be formed of a metal material. In the rotating device according to the above aspect of the present invention, the number of the plurality of stators and the number of the plurality of magnets are each an even number, The plurality of stators are arranged on the shaft member at equal intervals in the axial direction, The plurality of magnets may be arranged side by side at equal intervals on the rotor in the axial direction. In the rotating device according to the above aspect of the present invention, the number of the stators is plural, The coils of the plurality of stators may be electrically connected in parallel.

[0011] In the rotating device according to the above-mentioned another aspect of the present invention, the outer peripheral surface of the rotor may be provided with one or more openings penetrating the rotor from inside to outside, and in this case, it is preferable that at least one of the openings is located between the magnet and the first bearing in the axial direction. Furthermore, when the outer peripheral surface of the rotor is provided with a plurality of openings, it is preferable that at least one of the openings is located between the magnet and the second bearing in the axial direction.

[0012] In the rotating device according to the above aspect of the present invention, one or more rotor blades may be provided inside the rotor, and when a plurality of rotor blades are provided, it is preferable that the stator is disposed between the plurality of rotor blades in the axial direction of the shaft member. Also, the single rotor blade or any of the plurality of rotor blades may face the first bearing at least partially in the axial direction of the shaft member. In addition, in the above-mentioned another aspect of the rotating device of the present invention, a preload may be applied to an inner ring of either the first bearing or the second bearing, the inner ring being fixed to the shaft member, in the direction of the other bearing.

[0013] The rotating device of the present invention may further include blades attached to an outer circumferential surface of the rotor. [Brief description of the drawings]

[0014] [Figure 1] 1 is a longitudinal sectional view of a rotating device according to a first embodiment which is an example of the present invention. [Diagram 2] 1 is a longitudinal sectional view of a rotating device according to a second embodiment which is an example of the present invention. [Diagram 3] FIG. 11 is a longitudinal sectional view of a rotating device according to a third embodiment which is an example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotating device according to an embodiment of the present invention will now be described with reference to the drawings. [First embodiment] FIG. 1 is a vertical cross-sectional view of a rotating device 1 according to a first embodiment, which is an example of the present invention. In the description of this embodiment, the terms "upper" and "lower" refer to the upper and lower positions in FIG. 1, and do not necessarily coincide with the upper and lower positions in the direction of gravity.

[0016] Furthermore, in the direction of axis x (hereinafter also referred to as the "axial direction"), the direction of arrow a is the upper side a, and the direction of arrow b is the lower side b. In addition, in the direction perpendicular to axis x (hereinafter also referred to as the "radial direction"), the direction away from axis x (the direction of arrow c) is the outer circumferential side c, and the direction toward axis x (the direction of arrow d) is the inner circumferential side d. The clockwise circumferential direction (the circumferential direction as seen from the upper side a) around axis x is the circumferential direction e, and the counterclockwise circumferential direction f. Note that the circumferential directions e and f are not shown in FIG. 1. In addition, in the description of this embodiment, a portion that rotates within the rotating device 1 may be referred to as the "rotating side", and a portion that supports and is fixed to the rotating side member may be referred to as the "fixed side" or the "stationary portion". Note that the stationary portion may be stationary relative to the rotating side member.

[0017] The rotating device 1 of this embodiment includes a shaft member 5, a cylindrical rotor 3 rotatable relative to the shaft member 5, a mounting member 7 that supports the shaft member 5 at an end on an upper side a and an end on a lower side b in the direction of the axis x, a bearing 4 that supports the rotor 3 relative to the shaft member 5, and a stator 2 located inside the rotor 3. It is prepared.

[0018] In the rotating device 1 of this embodiment, the shaft member 5 is fixed to a mounting member 7. The mounting member 7 is an object to which the rotating device 1 is fixed, and can be, for example, a case (housing) of a rotating device such as a motor, or a device to which the rotating device is attached (such as an electronic device, an automobile as a moving body, or a frame or board of a rotating device). The mounting member 7, together with the shaft member 5, is a fixed member.

[0019] The shaft member 5 and the attached member 7 are members that are stationary relative to the rotor 3 including the rotating body described below. Therefore, these are collectively referred to as stationary members (stationary parts). Note that the stationary member (stationary part) need only be stationary relative to the rotor 3, and the stationary member (stationary part) itself does not need to be completely stationary and may sway due to the rotation of the rotor 3. In other words, it is sufficient that it is stationary relative to the rotor 3. The attached member 7 is a mounting member to which the attached member is attached, with the rotating device 1 being the attached member.

[0020] The stator 2 includes a stator core 21 fixed to a shaft member 5 and having magnetic pole portions 23 extending radially to an outer periphery c with the shaft member 5 as an axis, and a coil 22 wound around the magnetic pole portions 23. The stator core 21 is a laminate of silicon steel plates or the like, and is composed of an annular portion 24 arranged coaxially so as to surround the shaft member 5, and a plurality of magnetic pole portions 23 formed to extend radially from the annular portion 24 toward the outer periphery c.

[0021] The coils 22 are wound around each of the magnetic pole portions 23. The stator core 21 and the coils 22 are insulated by an insulator (not shown) made of an insulating material. Instead of the insulator, an insulating film may be painted on the surface of the stator core to insulate it from the coils.

[0022] The rotor 3 includes a magnet 31 that faces the magnetic pole portion 23 on the outer circumferential side of the stator 2, and a cylindrical rotating body 32 to whose inner circumferential surface the magnet 31 is attached directly or via another member such as an adhesive. The rotating body 32 is formed from a single member.

[0023] The rotor 32 is cylindrical and centered on the axis of the shaft member 5, and surrounds the stator 2. The rotor 32 also has a function of preventing leakage of a magnetic field from inside the rotor 32, and is made of a magnetic material or a non-magnetic material. By making the rotor 32 out of a non-magnetic material, the rotor 32 does not form a magnetic circuit together with the magnet 31, and therefore leakage of magnetic flux to the outside can be suppressed. Examples of non-magnetic materials that form the rotor 32 include aluminum, plastic, and ceramics.

[0024] In addition, the material of the rotating body 32 is preferably formed of a metal material. By forming the rotating body 32 of a metal material, heat generated from the stator 2 can be radiatively cooled. That is, the heat of the stator 2 can be radiated and cooled to the outside by being propagated to the rotating body 32 via the shaft member 5 and through the bearing 4, and also the heat of the magnet 31 received from the stator 2 can be propagated to the rotating body 32 to radiate and cool the heat to the outside. Therefore, aluminum, which is a non-magnetic material and a metal member, can also be used as the material of the rotating body 32.

[0025] The rotating body 32 has a so-called vertically long shape in which the length r in the radial direction (directions of arrows c and d) is smaller than the length q in the axial direction of the axis x (r < q). By making the rotating body 32 have a vertically long shape in this way, the centrifugal force acting on the rotating body 32 can be reduced, the high-speed rotation of the rotating device 1 can be achieved, and the responsiveness to signals such as startup, stop, and rotation speed change can be improved.

[0026] In the present embodiment, in the axial direction, the inner diameter t and the outer diameter r of the rotating body 32 are substantially the same from the end of the rotating body 32 on the first bearing 41 side (upper side a) to the end of the rotating body 32 on the second bearing 42 side (lower side b). Since the outer diameter of the rotating body 32 is substantially the same thickness over almost the entire length, the coaxiality is improved, and the high-speed rotation and rotation stability of the rotating device 1 can be achieved.

[0027] Here, the term "substantially" means to allow manufacturing errors of the object itself, ribs, holes for positioning, or openings 33 and 34 described later. Even if these exist, when their existence allows the outer diameter dimension to be considered the same outer diameter, it is construed as "substantially the same outer diameter". The same applies when the term "substantially" is used for other members hereinafter.

[0028] The magnet 31 is attached to the inner circumferential surface of the rotor 32 so as to face the stator 2. The magnet 31 has an annular shape, with regions magnetized to the N pole and regions magnetized to the S pole alternately provided at regular intervals along the circumferential direction. The magnet 31 may be an annular integral molding, or multiple magnets may be attached in a line to the inner circumferential surface of the rotor 32 to form a cylindrical shape.

[0029] The magnet 31 is made of resin. More specifically, a magnetic material is dispersed in a resin binder, and the magnet is magnetized by a known method after molding. By making the magnet 31 of resin, the weight of the magnet 31 and the rotor 3 can be reduced, the centrifugal force can be reduced, the rotating device 1 can be rotated at a high speed, and the responsiveness to signals such as start, stop, and change in rotation speed can be improved.

[0030] In addition, in the present invention, even if multiple magnets are arranged in a cylindrical shape, they are treated as one magnet. In other words, when we say "multiple magnets" in the present invention, it means that there are multiple cylindrical magnets (which may be an integrally molded product or multiple magnets arranged in a cylindrical shape).

[0031] A predetermined magnetic gap G is provided between the magnet 31 and the stator 2. A plurality of magnetic gaps G are arranged in the circumferential direction or are continuously formed. A predetermined gap is provided between the magnet 31 and the stator 2 so that the magnetic gap G has at least a certain radial dimension.

[0032] The bearings 4 are arranged on both sides of the stator 2 in the axial direction of the shaft member 5, and include a first bearing 41 located above and a second bearing 42 located below. That is, the magnet 31 and the stator 2 are located between the first bearing 41 and the second bearing 42 in the axial direction of the shaft member 5. The first bearing 41 and the second bearing 42 use members of the same configuration (same shape, structure, size, and material). The following description focuses on the first bearing 41, but the same applies to the second bearing 42.

[0033] The first bearing 41 is a so-called ball bearing having an outer peripheral ring 41a, an inner peripheral ring 41b, and balls 41c interposed between the outer peripheral ring 41a and the inner peripheral ring 41b. The balls 41c roll between the outer peripheral ring 41a and the inner peripheral ring 41b, so that the rotational resistance of the inner peripheral ring 41b relative to the outer peripheral ring 41a is significantly reduced. Due to its function, the first bearing 41 is formed of a member such as a hard metal such as iron or a ceramic.

[0034] The outer circumferential ring 41a of the first bearing 41 and the outer circumferential ring 42a of the second bearing 42 are disposed at both ends of the rotating body 32. The first bearing 41 and the second bearing 42 are fixed in contact with each other on their inner circumferential surfaces (the portion on the first bearing 41 side and the portion on the second bearing 42 side). In addition, in the axial direction of the shaft member 5, the outer circumferential ring 41a of the first bearing 41 and the outer circumferential ring 42a of the second bearing 42 face the stator 2. Meanwhile, the inner circumferential ring 41b of the first bearing 41 and the inner circumferential ring 42b of the second bearing 42 are each fixed in contact with each other on their outer circumferential surfaces. In the axial direction of the shaft member 5, the inner circumferential ring 41b of the first bearing 41 and the inner circumferential ring 42b of the second bearing 42 face the magnet 31.

[0035] In this embodiment, the outer peripheral ring 41a of the first bearing 41 and the outer peripheral ring 42a of the second bearing 42 are in direct contact with the inner peripheral surface of the rotating body 32, and the inner peripheral ring 41b of the first bearing 41 and the inner peripheral ring 42b of the second bearing 42 are in direct contact with the outer peripheral surface of the shaft member 5, but a separate member, for example a ring-shaped member, may be interposed between them relative to the first bearing 41, the second bearing 42, and the shaft member 5. This separate member may be a stationary member (stationary part) that is stationary relative to the first bearing 41, the second bearing 42, and the rotating body 32, like the shaft member 5, or may rotate with respect to the shaft member 5 and the first bearing 41, the second bearing 42, and the rotating body 32.

[0036] This allows the rotor 3 to rotate relative to the shaft member 5. The rotor 3 is configured to be rotatable around the axis of the shaft member 5 as a central axis. The outer peripheral surfaces of the first bearing 41 and the second bearing 42 contact the inner peripheral surfaces at both ends of the rotating body 32 in the same way, and the inner peripheral surfaces of the first bearing 41 and the second bearing 42 also contact the outer peripheral surfaces at both ends of the shaft member 5 in the same way. This improves the concentricity between the shaft member 5 and the rotor 3, allowing the rotating device 1 to rotate at high speed and stabilize its rotation.

[0037] As shown in FIG. 1, in this embodiment, the radial dimension (which is substantially the same as the inner diameter t of the rotating body 32 and is therefore hereinafter indicated by the symbol t) of the bearing 4 (first bearing 41) in the radial direction is larger than the radial dimension s of the stator 2 in the radial direction (t>s).

[0038] The shaft member 5 is formed of a single member (i.e., it is not a member formed by combining multiple components, but a member that is substantially composed of only a single part, and a coating film covering the surface of a single part is included in the concept of a single member). By forming the shaft member 5 from a single member, coaxiality is improved, and the rotating device 1 can be rotated at high speed and with stable rotation. In order to reduce weight, the shaft member 5 is formed, for example, from aluminum and is hollow (more specifically, cylindrical).

[0039] In this embodiment, the shaft member 5 is a member on the fixed side (stationary portion). Since the shaft member 5 is a member having a function of fixing and supporting the entire rotating device 1, it is required to have a rigidity according to the function. Therefore, the shaft member 5 may have a bending rigidity greater than that of the rotor 32. When a metal material is used as the material for the rotor 32 for the purpose of heat dissipation, the shaft member 5 may also be made of a metal material to further enhance heat dissipation by propagation.

[0040] In this embodiment, the outer diameter of the shaft member 5 in the axial direction is substantially the same from the portion facing the first bearing 41 to the portion facing the second bearing 42. Since the outer diameter of the shaft member 5 is substantially the same over almost the entire length, coaxiality is improved, and the rotating device 1 can be rotated at high speed and with stable rotation.

[0041] An opening (not shown) is provided in the middle of the shaft member 5, and a lead wire (not shown) connected to the coil 22 is pulled from the opening into a cavity (not shown) inside the shaft member 5, and then passed through the internal cavity and pulled out to the outside of the rotating device 1 from an end opening (not shown) of the shaft member 5.

[0042] In the rotating device 1 according to this embodiment, a first bearing 41 and a second bearing 42 are closed (arranged) on both end sides of the rotor 32. Electricity is supplied from the outside to the coil 22 of the stator 2 located in this closed space. Note that "closed" here refers to a state in which at least the openings on both end sides of the rotor 32 are closed by the bearings, and it may be in a physically completely sealed state, or it may be that the bearings themselves have gaps and the inside and outside of the closed space are not airtight.

[0043] In the rotating device 1 according to this embodiment, the inside of the space closed by the rotor 32, the bearing 4, etc. and the outside are electrically connected to each other by passing a lead wire through the hollow inside the shaft member 5. Therefore, it is possible to supply power to the coil 22 of the stator 2 located inside the closed space by the lead wire.

[0044] In the rotating device 1 according to this embodiment, the outer circumferential surface of the rotor 32 is provided with openings 33 and 34 penetrating the rotor 32 from the inside to the outside. The opening (hereinafter referred to as the "upper opening") 33 provided on the upper side a (first bearing 41 side) in the direction of the axis x is located between the magnet 31 and the first bearing 41, and is a rectangular hole with six holes provided at equal intervals in a row circumferentially on the outer circumferential surface of the rotating body 32. On the other hand, the opening (hereinafter referred to as the "lower opening") 34 provided on the lower side b in the direction of the axis x is located between the magnet 31 and the second bearing 42, and similar to the upper opening 33, is a rectangular hole with six holes provided at equal intervals in a row circumferentially on the outer circumferential surface of the rotating body 32.

[0045] The shape of the holes in both the upper opening 33 and the lower opening 34 is not limited to this, and may be any shape such as a square, a circle, an ellipse, etc. Also, although an example in which six holes are provided in a row in the circumferential direction in both the upper opening 33 and the lower opening 34 has been given, the number of holes and the number of rows are arbitrary, and as long as at least one is formed, the function as an opening can be exhibited.

[0046] In this way, by providing the upper opening 33 and the lower opening 34 on both sides of the magnet 31 and the stator 2 in the direction of the axis x, an air flow is easily generated in which air flows in from one side and flows out to the other side. The air flow can release heat inside the rotor 32 to the outside, and can cool the stator 2.

[0047] In particular, as described below, when vanes are attached to the outer circumferential surface of the rotor 32 to make the rotating device 1 of this embodiment function as a blower, an air flow in which air actively flows in from one side and flows out to the other side is generated by the action of the air flow flowing near the outer periphery of the rotor 32. Therefore, the stator 2 can be efficiently cooled by the air entering the inside of the rotor 32 from the upper opening 33 and the lower opening 34.

[0048] In this embodiment, multiple upper openings 33 and multiple lower openings 34 are provided, but even if only one of each is provided, or even if only one opening is provided, it is possible to communicate the inside and outside of the rotating body 32, and a certain amount of heat dissipation can be expected within the rotating body 32.

[0049] In this embodiment, the upper opening 33 is located between the magnet 31 and the first bearing 41 in the axial direction, and therefore the upper opening 33 is located in the vicinity of the magnet 31, thereby suppressing deterioration of the magnet 31 (for example, deterioration of the resin, high-temperature demagnetization of the magnet itself, etc.; the same applies below when discussing deterioration of the magnet). In this embodiment, the lower opening 34 is located between the magnet 31 and the second bearing 42 in the axial direction, so that the lower opening 34 is located in the vicinity of the magnet 31, thereby suppressing deterioration of the magnet 31.

[0050] The rotating device 1 according to this embodiment further includes rotor blades 6, 6' provided on the rotor 32 inside the rotor 32. The rotor blades 6, 6' form a so-called impeller, and are members that actively generate an air flow from the upper side a to the lower side b in the direction of the axis x inside the rotor 32 as the rotor 32 rotates.

[0051] Due to the action of the rotor blades 6, 6', air is actively taken into the inside of the rotor 32 from the upper opening 33, sent to the lower opening 34, and then discharged. Therefore, by providing the rotor blades 6, 6', the stator 2 can be cooled even more efficiently. The rotor blades 6, 6' may have a shape that draws in air from the upper opening 33, other than a shape that generates an air flow from the upper side a to the lower side b in the direction of the axis x.

[0052] 1, in this embodiment, an upper side a spacer 43 is provided between the moving blade 6 on the upper side a (first bearing 41 side) and the first bearing 41, separating the first bearing 41 and the moving blade 6 in the axial direction. In addition, a lower side b spacer 44 is provided between the moving blade 6' on the lower side b (second bearing 42 side) and the second bearing 42, separating the second bearing 42 and the moving blade 6' in the axial direction.

[0053] The spacer 43 on the upper side a (first bearing 41 side) covers one surface of the first bearing 41 in the axial direction and serves as a cover. The spacer 44 on the lower side b (second bearing 42 side) covers one surface of the second bearing 42 in the axial direction and serves as a cover. The spacers 43 and 44 are optional components, and the spacers 43 and 44 may be formed as part of the rotor blades 6 and 6'.

[0054] Both ends of the shaft member 5 are fitted into and fixed to holes 71 provided in the attached member 7. There are no particular limitations on the method of fixing both ends of the shaft member 5 to the attached member 7, and any of the conventionally known methods such as adhesion, melting, welding, screwing, fastening, and locking may be used. In particular, for the attached member 7a on the upper side a, the shaft member 5 is fixed by passing it through a hole in a doughnut-shaped fixing member 92, and this fixing member 92 is fixed to the lower side b of the attached member 7a, thereby fixing the shaft member 5 and the attached member 7a.

[0055] A disc spring 91 is interposed between the lower surface of the fixed member 92 and the upper surface of the inner peripheral ring 41b of the first bearing 41. The disc spring 91, which is fixed in a state in which it is pressed from above by the fixed member 92, urges the inner peripheral ring 41b of the first bearing 41 downward by its elastic force. In other words, the combination of the disc spring 91 and the fixed member 92 applies a preload to the inner peripheral ring 41b of the first bearing 41 in the direction of the second bearing 42.

[0056] This preloading action positions the inner ring 41b of the first bearing 41, which is loosely fitted into the shaft member 5, and allows the inner ring 41b of the first bearing 41 to be fixed to the shaft member 5 with an adhesive or the like.

[0057] In this embodiment, an example is given in which a preload is applied to the inner ring 41b of the first bearing 41 on the upper side a in the direction of the second bearing 42. However, the same effect as this embodiment can be achieved even if the opposite configuration is used, that is, if a preload is applied to the inner ring 42b of the second bearing 42 on the lower side b in the direction of the first bearing 41.

[0058] In the rotating device 1 configured as described above, the rotor 3 surrounding the stator 2 is rotatable relative to the stator 2 fixed to the shaft member 5, and the rotating device is a so-called outer rotor type brushless motor. However, in a general outer rotor type brushless motor, a shaft fixed to the rotor rotates, and the rotor is rotated by the shaft. In the rotating device 1 of this embodiment, the shaft member 5, whose axis coincides with the central axis of rotation of the rotor 3, is a fixed member, and is configured so that rotational force is directly extracted from the rotor 3.

[0059] By forming the rotor 32 from a single member, the central axes of the first bearing 41 and the second bearing 42 can be made coaxial with the shaft member 5 . When the rotating body 32 is formed from multiple members, there are cases where multiple tolerances for the multiple members constituting the rotating body 32 and the first bearing 41 and the second bearing 42 must be taken into consideration. However, by forming the rotating body 32 from a single member, the number of tolerances to be taken into consideration can be reduced, and it becomes easier to align the central axes of the first bearing 41 and the second bearing 42 coaxially with the shaft member 5. By improving the coaxiality in this way, it is possible to achieve high-speed rotation of the rotating device 1 and stable rotation.

[0060] The mounting member 7 is a member to which the rotating device 1 is fixed, and is formed of, for example, plastic or metal. The mounting member 7 is depicted as a flat plate in the drawings, but this is merely an example assuming that the periphery of the part to which the rotating device 1 is attached is flat, and the mounting member 7 can have various shapes depending on the type of the mounting member 7 itself. The periphery of the part to which the rotating device 1 is attached does not have to be flat. In addition, in the shaft member 5, the mounting member 7 is mounted at both ends in this embodiment, but the mounting member 7 may be attached to only one end, for example, only the part on the upper side a in the direction of the axis x.

[0061] In the rotating device 1 according to the present embodiment, the shaft member 5 is coaxially fixed to a mounting member 7. In the rotating device 1 according to the present embodiment, the shaft member 5 is coaxially fixed to a rotor 3 which is a rotating body.

[0062] In the rotating device 1 according to this embodiment, the shaft member 5 is fixed and the rotor 3, which is a rotating body, rotates relative to the shaft member 5 via the bearing 4, so that the radial dimension s of the stator 2 can be made smaller than the radial dimension t of the bearing 4 (t>s), as shown in Fig. 1. Therefore, the stator 2 can be made very small.

[0063] In a conventional outer rotor type brushless rotating device in which the rotor 3 and the shaft corresponding to the shaft member 5 are fixed and rotate together, a bearing must be disposed between the stator, which is the fixed side located inside the rotating body, and the shaft. Therefore, the radial dimension s of the stator is necessarily larger than the radial dimension t of the bearing 4 (t <s)なってしまう。

[0064] However, by adopting the configuration of the present invention, it is possible to make the radial dimension s of the stator smaller than the radial dimension t of the bearing (t>s), or to make the two the same (t=s), thereby making it possible to reduce the size of the entire rotating equipment. Furthermore, in the case where there is no need to protrude a shaft member for extracting a rotational force from the rotating device, further miniaturization and space saving can be achieved.

[0065] In addition, in conventional rotating devices in which a rotating shaft member protrudes from the rotating device, one side of the shaft member is supported while rotating, and rotational force is extracted from the other protruding end, which makes it easy for rotational fluctuations to occur. However, in the rotating device 1 of this embodiment, the rotor 3 itself, supported by bearings 4, rotates as a rotating body, so the rotation of the rotor 3 is stable.

[0066] In addition, in the rotating device 1 according to this embodiment, the first bearing 41 and the second bearing 42 are fixed to both ends of the rotating body 32, respectively, to support the rotating body 32, so that the rotation of the rotating body 32 is stable with respect to the shaft member 5. In particular, the magnet 31, which is a component of the rotor 3 together with the rotating body 32 and has a predetermined weight, can rotate the rotating body 32 in the axial direction of the shaft member 5. Since the bearing 41 is located between the first bearing 41 and the second bearing 42 which support the rotor 32, the rotation of the rotor 32 is stabilized.

[0067] It is more preferable that the bearings are disposed at both ends of the rotor as in this embodiment, but if the bearings are disposed near both ends of the rotor, the rotation of the rotor relative to the shaft member will be sufficiently stable. The term "near" here means a position close to both ends of the rotor, and cannot be clearly defined numerically, but for example, a region that is 20% of the length from both ends of the rotor in the axial direction, and preferably a region that is 10% of the length from both ends, is included in the concept of "both end sides".

[0068] In the rotating device 1 according to this embodiment, each of the two rotor blades 6, 6' partially faces the first bearing 41 or the second bearing 42 in the axial direction of the shaft member 5. By arranging the rotor blades 6, 6' in this manner, an airflow can be generated in the space inside the rotor 32 over a long area in the axial direction, and the space inside the rotor 32 can be efficiently cooled.

[0069] Furthermore, in the rotating device 1 according to this embodiment, the first bearing 41 and the second bearing 42 are made of members having the same configuration, so that the rotation of the rotor 3 is stabilized. As described above, in the rotating device 1 according to this embodiment, the rotation of the rotor 3 is less likely to be shaken, and high-precision stabilization can be achieved. Stabilization of the rotation of the rotor 3 means that rotation unevenness is less likely to occur, which can achieve high torque for the rotating device 1. That is, the rotating device 1 according to this embodiment can provide excellent basic characteristics as a rotating device while being miniaturized.

[0070] Moreover, in this embodiment, the single stator 2 is disposed in the central portion C1 of the shaft member 5 in the axial direction. Therefore, the center of gravity of the entire rotating device 1 can be located approximately in the center in the axial direction, and weight balance can be ensured. Furthermore, the weight can be distributed evenly in the axial direction. Therefore, the rotating device 1 can rotate at high speed and stabilize its rotation.

[0071] Furthermore, in this embodiment, the single magnet 31 is disposed in the central portion C2 of the rotor 32 in the axial direction. Therefore, the center of gravity of the rotor 3, which is the rotating member, can be located approximately in the center in the axial direction as a whole, and weight balance can be ensured. Also, the weight can be distributed evenly in the axial direction. Therefore, the rotating device 1 can rotate at high speed and stabilize the rotation.

[0072] [Second embodiment] Next, a rotating device 1a according to a second embodiment, which is one example of the present invention, will be described with reference to the drawings. Fig. 2 is a longitudinal sectional view of a rotating device 1a according to a second embodiment of the present invention, which is an example of the present invention. Fig. 2 is a longitudinal sectional view taken at approximately the same position as Fig. 1. In the description of this embodiment, members and components having the same functions and structures as those in the above embodiment are given the same reference numerals in Fig. 2 as those in the above embodiment, and detailed description thereof is omitted (unless otherwise specified).

[0073] This embodiment is characterized in that the stators and magnets are arranged in pairs in the axial direction, facing each other. As shown in FIG. 2, three stators 2a-1, 2a-2, 2a-3 (hereinafter, these may be referred to as the "first stator 2a-1", the "second stator 2a-2", and the "third stator 2a-3", respectively, as necessary) are arranged at equal intervals on the shaft member 5a in the axial direction (axis x direction). Each of the stators 2a-1, 2a-2, and 2a-3 has a configuration similar to that of the stator 2 in the first embodiment. The shaft member 5a has a configuration similar to that of the shaft member 5 in the first embodiment, except that the axial length of the shaft member 5a is longer.

[0074] On the other hand, in this embodiment, as shown in FIG. 2, three magnets 31a-1, 31a-2, and 31a-3 (hereinafter, these may be referred to as the "first magnet 31a-1", the "second magnet 31a-2", and the "third magnet 31a-3", respectively, as necessary) are arranged on the inner peripheral surface of the rotor 32a at equal intervals in the axial direction (axis x direction). Each of the magnets 31a-1, 31a-2, and 31a-3 has the same configuration as the magnet 31 in the first embodiment. Also, the rotor 32a has the same configuration as the rotor 32 in the first embodiment, except that the axial length (more specifically, the length between the openings 33 and 34) is long.

[0075] In this manner, in the present embodiment, the stators 2a-1, 2a-2, 2a-3 and the magnets 31a-1, 31a-2, 31a-3 are arranged in multiple rows (triples) in the axial direction, thereby making it possible to achieve either improved torque or faster rotation of the rotating device 1a, or both.

[0076] In this embodiment, the second stator 2a-2, which is the center of the three stators, is fixed to the center part C1a of the shaft member 5a in the axial direction. Therefore, the center of gravity of the entire rotating device 1a can be located approximately in the center in the axial direction, and weight balance can be ensured. Furthermore, the weight can be distributed evenly in the axial direction. This allows the rotating device 1a to rotate at a high speed and stabilize its rotation.

[0077] Furthermore, in this embodiment, the second magnet 31a-2, which is the center of the three magnets, is fixed to the center part C2a of the rotor 32a in the axial direction. Therefore, the center of gravity of the rotor 3a, which is the rotating member, can be located approximately in the center in the axial direction, and weight balance can be ensured. In addition, the weight can be distributed evenly in the axial direction. Therefore, the rotating device 1a can rotate at a high speed and stabilize the rotation.

[0078] In this embodiment, the coil 22a-1 of the first stator 2a-1, the coil 22a-2 of the second stator 2a-2, and the coil 22a-3 of the third stator 2a-3 are electrically connected in parallel in this order. By connecting them in parallel in this manner, the resistance value of the entire coil consisting of the multiple coils 22a-1, 22a-2, and 22a-3 can be reduced, and the amount of Joule heat generated can be reduced, so that the amount of heat generated can be suppressed even when the rotating device 1a is rotated at high speed.

[0079] Incidentally, the lead wires (not shown) at both ends of the coils 22a-1, 22a-2 and 22a-3 connected in parallel are pulled into a cavity (not shown) inside the shaft member 5a from an opening (not shown) provided midway through the shaft member 5a, as in the first embodiment, and are then pulled out through the internal cavity to the outside of the rotating device 1a from an end opening (not shown) of the shaft member 5a.

[0080] In this embodiment, the upper opening 33 is located between the first magnet 31a-1 and the first bearing 41 in the axial direction, and therefore the upper opening 33 is located in the vicinity of the first magnet 31a-1, thereby suppressing deterioration of the first magnet 31a-1. Furthermore, in this embodiment, the lower opening 34 is located between the third magnet 31a-3 and the second bearing 42 in the axial direction, and therefore the lower opening 34 is located in the vicinity of the third magnet 31a-3, thereby suppressing deterioration of the third magnet 31a-3.

[0081] Also, in the present embodiment, in the axial direction, since three stators 2a-1, 2a-2, and 2a-3 are positioned between the upper opening 33 and the lower opening 34, before the air flow introduced through the upper opening 33 is discharged from the lower opening 34, it can contact and exchange heat with all the stators 2a-1, 2a-2, and 2a-3, thereby efficiently cooling these stators 2a-1, 2a-2, and 2a-3.

[0082] In the present embodiment, the rotating body 32a has a so-called vertically long shape in which the length r in the radial direction (the directions of arrows c and d) is smaller than the length q in the axial direction of the axis x (r < q). By making the rotating body 32a vertically long in this way, centrifugal force can be reduced, enabling the high-speed rotation of the rotating device 1a, and at the same time, the responsiveness to signals such as startup, stop, and rotation speed change can be improved.

[0083] In the present embodiment, compared to the first embodiment, the length r is even smaller than the length q (r << q), so the centrifugal force reduction effect can be further manifested, and it can be expected to realize the high-speed rotation of the rotating device 1a and the improvement of the responsiveness to the various signals at a higher level.

[0084] In the present embodiment, in the axial direction, the inner diameter t and the outer diameter r of the rotating body 32a are substantially the same from the end of the rotating body 32a on the first bearing 41 side (upper side a) to the end of the rotating body 32a on the second bearing 42 side (lower side b). Since the outer diameter of the rotating body 32a is substantially the same thickness over almost the entire length, the coaxiality is improved, and the high-speed rotation and rotation stability of the rotating device 1a can be achieved.

[0085] In the present embodiment, in the axial direction, the outer diameter of the shaft member 5a is substantially the same from the portion facing the first bearing 41 to the portion facing the second bearing 42. Since the outer diameter of the shaft member 5a is substantially the same thickness over almost the entire length, the coaxiality is improved, and the high-speed rotation and rotation stability of the rotating device 1a can be achieved.

[0086] As a modified example of this embodiment, the number of stators and magnets arranged in the axial direction is an odd number greater than three (e.g., five, seven, etc.). Even if the number of stators and magnets increases, the same effect as this embodiment can be expected. That is, in the axial direction, these multiple stators are arranged side by side on the shaft member at equal intervals, one of them (particularly the central) stator is arranged in the central part of the shaft member, and in the axial direction (axis x direction), these multiple magnets are arranged side by side on the shaft member at equal intervals, one of them (particularly the central) magnet is arranged in the central part of the shaft member, and the same effect as this embodiment can be expected.

[0087] [Third embodiment] Next, a rotating device 1b according to a third embodiment, which is an example of the present invention, will be described with reference to the drawings. Fig. 3 is a longitudinal sectional view of a rotating device 1b according to a third embodiment of the present invention, which is an example of the present invention. Fig. 3 is a longitudinal sectional view taken at approximately the same position as Fig. 1. In the description of this embodiment, members and components having the same functions and structures as those in the above embodiment are given the same reference numerals in Fig. 3 as those in the above embodiment, and detailed description thereof is omitted (unless otherwise specified).

[0088] This embodiment is characterized in that the stators and magnets are arranged in pairs in the axial direction, facing each other. As shown in FIG. 3, two stators 2b-1 and 2b-2 (hereinafter, these will be referred to as "stators" in the axial direction (axis x direction)) are arranged in the axial direction. The first stator 2b-1 and the second stator 2b-2 are sometimes referred to as the "first stator 2b-1" and the "second stator 2b-2" respectively. The stators 2b-1 and 2b-2 are arranged side by side on the shaft member 5b. Each of the stators 2b-1 and 2b-2 has a similar configuration to the stator 2 in the first embodiment. The shaft member 5b has a similar configuration to the shaft member 5 in the first embodiment, except that the shaft member 5b has a longer length in the axial direction.

[0089] On the other hand, in this embodiment, as shown in Fig. 3, two magnets 31b-1 and 31b-2 (hereinafter, these may be referred to as "first magnet 31b-1" and "second magnet 31b-2" respectively, as necessary) are arranged side by side on the inner circumferential surface of the rotor 32b in the axial direction (axis x direction). Each of the magnets 31b-1 and 31b-2 has a configuration similar to that of the magnet 31 in the first embodiment. Also, the rotor 32b has a configuration similar to that of the rotor 32 in the first embodiment, except that the axial length (more specifically, the length between the openings 33 and 34) is longer.

[0090] In this manner, in the present embodiment, the stators 2b-1, 2b-2 and the magnets 31b-1, 31b-2 are arranged in multiple rows (two rows) in the axial direction, thereby making it possible to achieve either improved torque or faster rotation of the rotating device 1b, or both.

[0091] In this embodiment, the two stators 2b-1 and 2b-2 are fixed to both sides of the central portion C1b of the shaft member 5b in the axial direction. Therefore, the center of gravity of the entire rotating device 1b can be located approximately in the center in the axial direction, and weight balance can be ensured. Furthermore, the weight can be distributed evenly in the axial direction. This allows the rotating device 1b to rotate at a high speed and stabilize its rotation.

[0092] Furthermore, in this embodiment, the two magnets 31b-1 and 31b-2 are fixed to both sides of the center part C2b of the rotor 32b in the axial direction. Therefore, the center of gravity of the rotor 3b, which is the rotating member, can be located approximately in the center in the axial direction as a whole, and weight balance can be ensured. In addition, the weight can be distributed evenly in the axial direction. Therefore, the rotating device 1b can be rotated at a high speed and the rotation can be stabilized.

[0093] In this embodiment, the coil 22b-1 of the first stator 2b-1 and the coil 22b-2 of the second stator 2b-2 are electrically connected in parallel. This parallel connection can reduce the resistance of the entire coil made up of the multiple coils 22b-1 and 22b-2, and reduces the amount of Joule heat generated, so that the amount of heat generated can be suppressed even when the rotating device 1b is rotated at high speed.

[0094] In addition, the lead wires (not shown) at both ends of the coils 22b-1 and 22b-2 connected in parallel are pulled into a cavity (not shown) inside the shaft member 5b from an opening (not shown) provided in the middle of the shaft member 5b, as in the first embodiment, and are then pulled out through the internal cavity to the outside of the rotating device 1b from an end opening (not shown) of the shaft member 5b.

[0095] In this embodiment, the upper opening 33 is located between the first magnet 31b-1 and the first bearing 41 in the axial direction, and therefore the upper opening 33 is located in the vicinity of the first magnet 31b-1, thereby suppressing deterioration of the first magnet 31b-1. Furthermore, in this embodiment, the lower opening 34 is located between the second magnet 31b-2 and the second bearing 42 in the axial direction, and therefore the lower opening 34 is located near the second magnet 31b-2, thereby suppressing deterioration of the second magnet 31b-2. Therefore, in this embodiment, both magnets 31b-1, 31b-2 can be efficiently cooled and deterioration can be suppressed.

[0096] Furthermore, in this embodiment, the two stators 2b-1, 2b-2 are positioned axially between the upper opening 33 and the lower opening 34, so that the air flow taken in at the upper opening 33 comes into contact with and exchanges heat with all of the stators 2b-1, 2b-2 before being released from the lower opening 34, thereby efficiently cooling these stators 2b-1, 2b-2.

[0097] In this embodiment, the rotating body 32b has a so-called vertically long shape in which the length r in the radial direction (the directions of arrows c and d) is smaller than the length q in the axial direction of the axis x (r < q). By making the rotating body 32b have a vertically long shape in this way, the centrifugal force can be reduced, enabling the rotating device 1b to rotate at high speed, and the responsiveness to signals such as startup, stop, and rotation speed change can be improved.

[0098] In this embodiment, the length r is even smaller than the length q (r << q) compared to the first embodiment, so the centrifugal force reduction effect can be further manifested, and it can be expected to realize the high-speed rotation of the rotating device 1b and the improvement of the responsiveness to the various signals at a higher level.

[0099] In this embodiment, in the axial direction, the inner diameter t and the outer diameter r of the rotating body 32b are substantially the same from the end of the rotating body 32b on the first bearing 41 side (upper side a) to the end of the rotating body 32b on the second bearing 42 side (lower side b). Since the outer diameter of the rotating body 32b is substantially the same thickness over substantially the entire length, the coaxiality is improved, and the high-speed rotation and rotation stability of the rotating device 1b can be achieved.

[0100] In this embodiment, in the axial direction, the outer diameter of the shaft member 5b is substantially the same from the portion facing the first bearing 41 to the portion facing the second bearing 42. Since the outer diameter of the shaft member 5b is substantially the same thickness over substantially the entire length, the coaxiality is improved, and the high-speed rotation and rotation stability of the rotating device 1b can be achieved.

[0101] As a modified example of this embodiment, the number of stators and magnets arranged in the axial direction is an even number greater than two (for example, four, six, etc.). Even if the number of stators and magnets increases, the same effect as this embodiment can be expected. That is, in the axial direction, these multiple stators are arranged side by side on the shaft member at equal intervals, two of them (particularly the central two) are arranged on both sides of the central part of the shaft member, and in the axial direction (axis x direction), these multiple magnets are arranged side by side on the shaft member at equal intervals, two of them (particularly the central two) are arranged on both sides of the central part of the shaft member, and the same effect as this embodiment can be expected.

[0102] Although the rotating device of the present invention has been described above with reference to preferred embodiments, the rotating device of the present invention is not limited to the configuration of the above embodiments. For example, in the above embodiments, only two moving blades 6, 6' have been described, but the number of moving blades may be one or more than two. In some cases, a plurality of moving blades may be preferable in terms of the cooling efficiency of the stator. By arranging a plurality of moving blades between the first bearing and the second bearing in the axial direction of the shaft member, an air flow can be efficiently generated inside the rotor over a long distance in the axial direction.

[0103] In the present invention, the term "rotor blade" refers to each component arranged in the axial direction, and does not refer to individual blades arranged, for example, radially in the circumferential direction, at one axial position. In this case, a collection of these blades becomes one "rotor blade." Therefore, even if there are many blades at one axial position, it is a single rotor blade. In the case where a plurality of rotor blades are provided, a stator is disposed between the plurality of rotor blades in the axial direction of the shaft member. By disposing the stator between the plurality of rotor blades, the cooling efficiency of the stator can be improved.

[0104] In addition, in the above-mentioned embodiments, examples are given in which two rows of openings (upper opening 33 and lower opening 34) are provided vertically, but the number of openings is not limited to two rows, and may be one row or three or more rows. For example, in the second embodiment, by forming openings in the rotor 32a in the region above the magnet 31a-2 on the upper side a or lower side b, the openings are located near the magnet 31a-2, so that deterioration of the magnet 31a-2 can be suppressed. In this way, when there are multiple magnets, by forming openings near each magnet, deterioration of each magnet can be suppressed.

[0105] When a plurality of openings are provided in the axial direction, it is also preferable to provide rotor blades corresponding to the respective openings. The action of the rotor blades allows active intake and exhaust for each opening, which efficiently forms an air flow and improves cooling efficiency. For example, one half of the axial direction may be used as an intake rotor blade (a rotor blade arranged on the intake port side) and the other half as an exhaust rotor blade (a rotor blade arranged on the exhaust port side).

[0106] In the rotating device according to the above embodiment, the first bearing 41 and the second bearing 42 are fixed to both ends of the rotor, but this is not limited thereto. The first bearing 41 may be fixed to a part of the rotor 32, 32a, 32b on the magnet 31, 31a-1, 31a-3 side with respect to both ends of the rotor 32, 32a, 32b, and the second bearing 42 may be fixed to another part of the rotor 32, 32a, 32b. Even in such a case, the rotor 32, 32a, 32b is supported, so that the rotation of the rotor 3, 3a, 3b is stable with respect to the shaft member 5, 5a, 5b.

[0107] From the above, the rotating body may have two ends in the axial direction of the shaft member, and the first bearing may be fixed to a part of the rotating body on one of the two ends, and the second bearing may be fixed to another part of the rotating body on the other of the two ends.

[0108] As described above, the rotating device of the present invention is different from a general outer rotor type brushless motor in which a shaft fixed to a rotor rotates, in that the shaft member is the fixed member, and the rotational force is directly taken from the rotor (including the rotor), which is the rotating member. Therefore, for example, in the rotating device of the present invention, a so-called air blower can be obtained by attaching blades radially to the outer circumferential surface of the rotor. And, by making the mounting member 7 described in the above embodiment into, for example, a cylindrical housing, a small-sized, high-performance air blower can be obtained.

[0109] In addition, a person skilled in the art can appropriately modify the rotating device of the present invention in accordance with conventionally known knowledge. As long as the configuration of the present invention is still provided even after such modification, it is of course included in the scope of the present invention. [Explanation of symbols]

[0110] 1...rotating device, 2...stator, 2a-1...first stator (stator), 2a-2...second stator (stator), 2a-3...third stator (stator), 3...rotor, 4...bearing, 5, 5a, 5b...shaft member, 6, 6'...moving blade, 7, 7a...mounted member, 21, 21a-1, 21a-2, 21a-3...stator core, 22, 22a-1, 22a-2, 22a-3... Coil, 23, 23a-1, 23a-2, 23a-3...magnetic pole portion, 24, 24a-1, 24a-2, 24a-3...annular portion, 31...magnet, 31a-1...first magnet (magnet), 31a-2...second magnet (magnet), 31a-3...third magnet (magnet), 32...rotating body, 32a...rotating body, 32b...rotating body, 33...upper opening (opening part), 34...lower opening (opening), 41...first bearing (bearing), 41a, 42a...outer ring, 41b, 42b...inner ring, 41c, 42c...ball, 42...second bearing (bearing), 43, 44...spacer, 71...hole, 91...disc spring, 92...fixing member.

Claims

1. A bearing, A cylindrical rotor; A stator located inside the rotor; A single or multiple magnets fixed to the inner circumferential surface of the rotor; Equipped with The rotor is provided with a rotor blade having a plurality of blades, an opening having a plurality of holes, and a spacer disposed between the bearing and the rotor blade in the axial direction, the plurality of blades and the plurality of holes are aligned in a circumferential direction, The rotor blade is located inside the rotor, The opening passes through the rotor from the inside to the outside, The spacer covers a surface of the bearing, The rotating machine, wherein the blade is a portion of the spacer.

2. A rotating equipment as described in claim 1, wherein the spacer separates the bearing and the blade.

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