JPH0638418A - Axial-gap rotating electric machine - Google Patents

Abstract

PURPOSE:To easily reduce the size and weight of the electric machine and quickly accelerate or decelerate the machine or to rotate the machine at a superhigh speed of several tens of thousands rpm and, at the same time, to increase the output of the machine. CONSTITUTION:A stator 21 is composed of a stator coil 25A which is fitted to the center of a stator frame 23 in the axial direction with bolts and split into two parts of an upper and lower parts in a plane containing the axis of a rotor 22, molded coils 25B buried in brackets 24 so that the coils 25B can face the coil 25A with rotor discs 29 in between, and back yokes 26. The rotor 22 is fitted to a rotating shaft 27 so that the rotor 22 can rotate together with the shaft 27 in one body, arranged so that gaps 28 and 28 can be formed between the coils 25A and 25B and rotor 22 at an intermediate section in the axial direction, and is constituted of cylindrical permanent magnets which are formed to discoid shapes by molding a fiber-reinforced resin, magnetized in the axial magnets, and dispersedly fitted to the rotor discs 29 at a rate of 10 pieces per one pole and the discs 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact and lightweight axial gap rotating electric machine for robots or an ultrahigh speed rotating and large output axial gap rotating electric machine for power generation.

[0002]

2. Description of the Related Art In a general cylindrical ultra-high speed rotating electric machine of 10000 rpm or more, centrifugal force during rotation is considerably large. Therefore, in the case of a rotating electric machine using a permanent magnet as a field, the permanent magnets should not scatter. A non-magnetic retaining ring having a considerable thickness is provided on the outer peripheral surface of the permanent magnet, and in the case of a rotating electric machine in which a rotor is provided with a coil, the coil end ring is pressed in the retaining environment.

On the other hand, the axial gap rotary electric machine has one
One rotor disk and a stator disk provided with an armature coil are opposed to one rotor disk through a gap, and are configured in the same rotation axis direction. And in this rotor disk,
Coils or permanent magnets are provided to form the poles of the field.

[0004]

However, when the conventional cylindrical rotary electric machine as described above is rotated at an extremely high speed of 10,000 rpm or more, the centrifugal force at the time of rotation becomes considerably large.
The rotor coil cannot withstand the strength and may be damaged. Further, as shown in FIG. 14, when the permanent magnet 1 is used for the field, the non-magnetic retaining ring 2 having a considerable thickness is required so that the permanent magnet 1 does not scatter. This retaining ring 2
Since a non-magnetic material is used to prevent the magnetic circuit from being short-circuited, the magnetic air gap length inevitably increases, the magnetomotive force consumed between the air gap portions increases, and the output of the rotating electric machine decreases. In the figure, 3 is a stator frame, 4 is a stator core, 5 is a coil, 6 is a rotor, 7 is a rotor yoke, 8 is a rotating shaft, and 9 is a gap.

On the other hand, the axial gap rotating electric machine is
Since the disk-shaped rotor yoke 10 is made of soft iron, which is a magnetic metal, as schematically shown in Fig. 15, the inertia of the rotor is considerably larger than that of a commonly used cylindrical rotating electric machine. . Therefore, the time from the start up to the target speed and the time from the rotation to the stop are considerably long, and the rapid acceleration / deceleration operation required for robots, automatic machines and the like is unsuitable. In the figure,
11 is a motor frame, 12 is a stator yoke, 13 is a U phase 13
a, V phase 13b, W phase 13c coil, 14 bearings, 15
Is a rotating shaft and 16 is a permanent magnet.

When the rotor disk is multi-staged in the structure of the conventional axial gap rotary electric machine as a structure of large capacity and high speed rotation, the stator disk with the coil and the rotor disk are alternately arranged in the direction of the rotation axis, which makes the manufacture impossible. It will be possible. Therefore, since the capacity is increased with only one rotor disk, the outer diameter of the rotor is increased, and it is difficult to increase the speed and output.

Further, as an electromagnetic structure, the rotor uses a magnetic material such as soft iron for the rotor yoke 10 because it is a magnetic path through which magnetic flux passes, but this causes the rotor weight to be heavy and the rotor material due to centrifugal force resistance. A problem occurs in mechanical strength, the load applied to the bearing increases, the critical speed that is the rotation limit speed of the rotating shaft also decreases, and high-speed rotation becomes impossible.

[0008] Therefore, an object of the present invention is to make the axial gap rotation small in size, light in weight, relatively easy to perform acceleration / deceleration rotation, or capable of ultra-high speed rotation of tens of thousands of revolutions / minute, and easy to increase the output. It is to provide an electric machine.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a disk-shaped coil and a stator provided with a back yoke without a slot in which a magnetic steel plate is spirally wound in the vicinity of the coil. A stator formed at both ends of the frame in the axial direction, and a permanent magnet magnetized in the axial direction, which is made of resin in a disk shape and arranged to form a gap with the coil in the axial direction, are arranged in the axial direction. A disk body fixed so as to penetrate therethrough is mounted on a rotating shaft so as to rotate integrally therewith.

[0010]

First, the mechanical structure will be described.

(1) For light weight and acceleration / deceleration,
A yoke made of a magnetic material is indispensable as a magnetic path for passing a magnetic flux through the rotor, and the inertia becomes relatively large as the capacity increases. Further, in the axial gap rotating electric machine, when the disc body is made of metal, the inertia of the rotor becomes considerably large, which is disadvantageous for rapid acceleration / deceleration operation.

However, in the present invention, since the disc body of the rotor can be made of a non-magnetic material, the disc inertia formed of a resin having a specific gravity smaller than that of metal makes the rotor inertia very small, which causes sudden addition It is advantageous for deceleration operation.

As for the weight of the rotating electric machine, the rotor is made of only resin except for the rotating shaft and the permanent magnet, which is very light. Since the stator frame and the bracket are also made of resin, the metal parts are only the back yoke of the stator, the coil, the permanent magnet, and the rotating shaft, and a significant weight reduction can be realized. Further, the rotary electric machine of the present invention can be increased in capacity in multiple stages as described in the section of increase in capacity. Therefore, the back yoke and the bracket of the stator have the same size and weight, and only the multi-stage coil and the permanent magnets need to be increased, and the effect of weight reduction becomes more remarkable.

(2) Regarding high-speed rotation, in the rotating electric machine of the present invention, a permanent magnet serving as a field is axially penetrated and fixed to the rotor plane of the disk body. Therefore, the disc body of the rotor acts so as to prevent the permanent magnets from jumping out by centrifugal force at high speed. In order to increase the centrifugal resistance, it is necessary to make the disk member sufficiently thick. In a conventional cylindrical electric machine with a radial magnetic circuit having a field and a coil in the radial direction, if the retaining ring on the outer circumference of the rotor provided for centrifugal resistance is made thicker, the magnetic gap length becomes longer. . However, in the rotating electric machine of the present invention, even if the thickness of the disk body is made sufficiently thick, the operating magnetic circuit is formed in the axial direction, so that it does not become the air gap length of the operating portion, and the output is not reduced and high speed is achieved. It is possible to rotate.

The permanent magnets forming the poles of the field are not one permanent magnet per pole, but a plurality of permanent magnets are dispersed and embedded in a plurality of holes of the rotor disk, so that the centrifugal force of the permanent magnets is generated. It is possible to avoid the stress from concentrating on a part of the disk body, and it is possible to withstand ultra-high speed rotation.

Further, by making the diameter of the permanent magnets on the outer peripheral side smaller than the diameter of the permanent magnets on the inner peripheral side, the centrifugal force can be improved, the inertia of the rotor can be effectively reduced, and the characteristics of the rotating electric machine can be improved. it can.

(3) Concerning the increase in capacity, increasing the capacity of the conventional axial gap rotary electric machine increases the radius of the rotor. As a result, the size of the machine is increased, the rotor inertia is significantly increased, and the allowable rotational speed is significantly reduced due to the strength of the centrifugal force resistant rotor material. In the rotating electric machine of the present invention as described in terms of electromagnetic field, the rotor has no iron core,
The magnetic circuit is composed of only two back yokes, permanent magnets, and air gaps, which are provided at both ends of the stator frame in the axial direction, and a magnetic portion forming a magnetic path is composed of only two back yokes on both sides. Therefore, by simply providing the stator coil and the rotor disk body, which can be divided into two or more, between the two back yokes in sequence, the operating portion of the multi-stage rotating electric machine is formed and high output can be realized.

In the rotating electric machine of the present invention for increasing the capacity, the rotor has multiple stages, but since the disc body is made of resin or non-magnetic light metal, the inertia of the rotor is significantly smaller than that of the conventional one. Since all the multi-stage discs have the same outer diameter, mechanical stress due to centrifugal force does not increase,
From a mechanical point of view, it is possible to increase the capacity of the axial gap rotating electric machine.

Further, since the rotary electric machine of the present invention has an axial gap, the rotor has a top shape similar to a flywheel, and the distance between the bearings on both sides supporting the disc body of the rotor is considerably shortened. The rigidity of the rotating shaft increases. Therefore, the torsional vibration frequency of the shaft becomes high, and the shaft can be stably rotated with little vibration even at an ultrahigh speed rotation. Next, the electromagnetic aspect will be described.

The coil consists of a conductor and a molding resin,
Since there is no iron core of the rotor, the magnetic circuit consists of only two back yokes, permanent magnets, and air gaps, which are provided on the inner surfaces of both ends of the stator frame in the axial direction. Only the back yoke of. Therefore, by simply providing the stator coil and the rotor disc that can be divided into two or more between the two back yokes,
The operation part of a multi-stage rotating electric machine is formed, and high output is possible.

The back yoke of the stator has no teeth,
Since there is no iron core of the rotor, the magnetic circuit is composed of only the back yoke permanent magnet and the air gap, and the magnetic portion forming the magnetic path can form the operating portion of the multi-stage rotating electric machine only by the two back yokes on both end sides. Therefore, the iron loss is significantly reduced, and the efficiency can be increased and the temperature rise during the operation of the rotating electric machine can be reduced.

In the axial gap rotary electric machine, since the circumference on the inner diameter side is naturally shortened, there is a problem that the space at the end of the coil is narrowed and the number of turns of the coil cannot be increased. However, due to the decrease in iron loss described above, it is possible to manufacture a high-frequency driven, ultra-high-speed, multi-pole rotating electric machine. When the number of poles is increased, the end of the coil becomes shorter and the number of turns of the coil increases, High output. Since the back yoke is formed by spirally winding a thin magnetic steel plate, iron loss due to generation of eddy current is suppressed.

At the time of high-speed rotation, in the conventional rotating electric machine, the teeth of the stator core cause the air gap magnetic flux to pulsate, generating a considerably large eddy current on the rotor surface. However, since the rotating electric machine of the present invention has no teeth on the back yoke, this eddy current is not generated and the efficiency is improved.

In the coil, since the soft magnetic material forming the magnetic path is only the back yoke, the magnetic air gap seen from the coil is considerably large. Therefore, the inductance of the coil is considerably reduced, the voltage drop of the inductance is reduced, and at the same time the terminal voltage is reduced.
Therefore, the drive power source can be downsized.

Further, when the magnetic gap becomes large, the armature reaction due to the coil also becomes small, so that demagnetization of the permanent magnet in the rotor can be prevented and a large current can be passed. Next, the stator division will be described.

The rotating electric machine of the present invention has a multi-stage operation unit for increasing the output, and has a structure in which the disc body of the rotor and the formed coils can be alternately arranged in the axial direction. Therefore, it is possible to house the rotor in a divided state by vertically dividing the stator into two parts in a plane including the axis of the rotating shaft. At the same time, the coil of the stator must also be bisectable, and the one-winding method is adopted to form a coil that forms an imaginary pole between the real poles and the center of the imaginary pole is on the bisector of the stator. By doing so, even if the stator is divided into two, the conductor wire in the molded coil will not be cut, and the rotary electric machine of the present invention can be configured.

The present invention is an axial gap, which is divided into two parts vertically in a plane including the axis of the rotating shaft.
The rotor can be easily taken out and maintenance can be facilitated.

Further, since the coil is formed by the coil alone without being wound around the teeth of the iron core, it is possible to easily take out only the coil by dividing the stator, and it is easy to replace the coil.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an upper half portion of an embodiment of the present invention by cutting.

In the figure, 20 is an axial gap rotating electric machine, and this axial gap rotating electric machine 20 comprises a stator 21 and a rotor 22 rotatably supported by the stator 21 via bearings.

In this structure, the stator 21 is formed by molding with a fiber reinforced epoxy resin and has a structure in which the stator frame 23 is vertically divided into two in a plane including the axis of the rotor 22, and the stator frame 23. Brackets 2 attached to both axial ends via bolts (not shown) and molded with fiber reinforced epoxy resin 2
4, 24, and bolts or other suitable fixing means (not shown) are attached to the axial center of the stator frame 23, and are formed into a substantially disk shape as a whole, and are vertically divided into two parts in a plane including the axial center of the rotor 22. Mold coil 25A and
A mold coil 25B embedded inside the bracket 24 so as to face the mold coil 25A via a rotor disk described later, and a mold coil 25B embedded inside the bracket 24 so as to be outside the mold coil 25B or via a bolt. It is composed of a back yoke 26 attached.
Here, the mold coil 25A has U,
It has V and W phase windings, adopts one-way winding method (or concentric winding method), and is molded with epoxy resin,
It has a two-part structure. The molded coil 25B also has windings of substantially the same U, V, and W phases, but is not divided into two. The back yoke 26 is formed by spirally winding a silicon steel plate 26a having a thickness of 0.2 mm as shown in FIGS.
The outer peripheral side and the inner peripheral side are sandwiched and fixed by rings 26b and 26c, respectively.

The rotor 22 has a rotating shaft 27 and a gap between the rotating shaft 27 and the mold coils 25A and 25B at an axially intermediate portion of the rotating shaft 27.
And two rotor disks 29, 29 which are arranged so as to form 28, 28, are molded into a disk shape by molding a fiber reinforced resin, and are mounted so as to rotate integrally with the rotating shaft 27. There is. Here, in the rotor disk 29, as shown in FIG.
10) are distributed and installed per pole. The permanent magnet 30 is formed in a cylindrical shape, is magnetized along the axial direction, and is fixed by penetrating the hole of the rotor disk 29. Further, on the center side of the rotor disk 29, a metal ring (not shown) that is engaged with a key (not shown) for rotating integrally with the rotary shaft 27 is integrally provided. Further, a spacer 31 is inserted between the rotor disks 29,
The outer side of each rotor disk 29 is pressed to the center side by a ring-shaped press fitting 32. Next, the operation of the embodiment configured as described above will be described. First, the mechanical structure will be described.

(1) Regarding lightweight and acceleration / deceleration, as is well known, a rotary electric machine requires a yoke of a magnetic material as a magnetic path for passing magnetic flux to a rotor, and the inertia becomes relatively large as the capacity increases. Further, as shown in FIG. 15, in the conventional axial gap rotating electric machine, when the disk is a magnetic material metal such as soft iron, the rotor has a disk shape, so that the inertia becomes considerably large, which is disadvantageous for rapid acceleration / deceleration operation.

However, in this embodiment, the rotor can be made of a non-magnetic material except for the rotary shaft and the permanent magnet 30,
By using a rotor disk 29 molded by molding with a fiber reinforced resin having a specific gravity of 1.5 for the rotor, the inertia of the rotor becomes extremely small.

Regarding the weight of the rotary electric machine, the rotor disc 2
9. The stator frame 23 and the bracket 24 are also made of resin, and the main metal part is the back yoke.
26, the windings of the mold coils 25A and 25B, the permanent magnet 30, and the rotating shaft 27 only, and a significant weight reduction can be realized. Further, the rotary electric machine of the present embodiment can be increased in capacity in multiple stages as described in the section of increase in capacity. Therefore, the back yoke 26 and the bracket 24 of the stator have the same size and weight, and only the mold coil 25A and the permanent magnet 30 in the multi-step portion need to be increased, and the effect of weight reduction becomes more remarkable.

(2) For high-speed rotation, it is necessary to make the outer peripheral member of the rotor sufficiently thick in order to enhance centrifugal resistance during rotation. As shown in FIG. 14, the conventional rotary electric machine of the cylindrical magnetic field having a coil in the radial direction and a radial direction magnetic circuit has a coil,
If the retaining ring 2 provided on the outer circumference of the rotor for thickening the centrifugal force is made thicker, the magnetic gap 9 becomes longer.

However, in this embodiment, the permanent magnet 30 serving as a field is embedded so as to penetrate the plane of the rotor disk 29 in the axial direction. Therefore, the rotor disc 29
Acts to suppress the permanent magnet 30 from jumping out due to centrifugal force at high speed. Further, in the present embodiment, even if the thickness of the rotor outer peripheral portion of the rotor disk 29 is made sufficiently thick, the magnetic field created by the permanent magnet 30 is formed in the rotation axis direction, so the magnetic air gap of the magnetic circuit increases. There is no such thing. Therefore, by increasing the mechanical strength as the centrifugal force resistance, the output does not decrease and high speed rotation becomes possible. Also,
The permanent magnets 30 that form the poles of the field are not one permanent magnet per pole, but a plurality (for example, 10) of permanent magnets 30 per pole are dispersed, and a plurality of rotor disks 29 (for example,
Since it is embedded in 10 holes, it is possible to avoid the stress due to the centrifugal force of the permanent magnet 30 from concentrating on a part of the rotor disk 29, and it is possible to withstand ultra-high speed rotation.

(3) Concerning the increase in capacity When the capacity of the conventional axial gap rotating electric machine is increased, the radius of the rotor is increased and the machine is inevitably increased in size, the inertia of the rotor is greatly increased, and the centrifugal resistance is increased. The allowable rotation speed is significantly reduced due to the strength of the rotor material. As will be described later in terms of electromagnetism, in this embodiment, since there is no rotor iron core, the magnetic circuit has two back yokes 26 and 26 provided inside both brackets 24 and 24, a permanent magnet 30, and a gap 28. The magnetic portion forming the magnetic path is only the two back yokes 26, 26 on both sides. Therefore, a mold coil that can be divided into two or more
By simply providing 25A and the rotor disk 29 between the two back yokes 26, 26 in sequence, the operating part of the multi-stage rotating electric machine is formed.
High output can be realized.

In order to increase the capacity, the rotor 22 in this embodiment has a multi-stage structure. However, the inertia of the rotor 22 to which the rotor disk 29 made of resin is attached is much smaller than that of the conventional one, and the rotor 22 has a multi-stage structure. Since all the rotor disks 29 have the same outer diameter, mechanical stress due to centrifugal force does not increase, and it is possible to realize a large capacity of the axial gap rotating electric machine in terms of mechanical aspects.

Further, in this embodiment, because of the axial gap rotation, the rotor 22 has a top shape similar to that of a flywheel, and the distance between the bearings on both sides supporting the rotor disk 29 is also considerably shortened. The shaft rigidity is increased. Therefore, the torsional vibration frequency of the shaft becomes high, and the shaft can be stably rotated with little vibration even at an ultrahigh speed rotation. From the results of the rotary shaft vibration analysis of the present embodiment shown in FIG. 6, the rotary shaft 1
The next vibration mode is 33000 rpm, and it can be seen that the high-speed rotation characteristics are sufficiently good.

From the results of the rotation strength test of this embodiment shown in FIG. 7, it was confirmed that the rotation axis was small even at 20000 rpm, the rotor was stably rotating, and the mechanical strength was sufficient. Next, the electromagnetic aspect will be described.

The mode coils 25A and 25B consist of windings of U, V, and W phases and fiber-reinforced epoxy resin only, and since there is no rotor iron core, the magnetic circuit has two back coils provided inside the bracket 24. It consists of the yokes 26, 26, the permanent magnet 30 provided on the rotor disk 29, and only the air gap 28, and the magnetic portion forming the magnetic path is only the two back yokes 26, 26 on both sides. Therefore, by merely alternately providing the mode coil 25A capable of being divided into two or more and the disc body 29 of the rotor between the two back yokes one after another, the operating portion of the multi-stage rotating electric machine is formed, and high output can be achieved. .

Since the stator core has no teeth and the rotor has no core, the magnetic circuit is composed of only the back yoke 26, the permanent magnets 30 and the air gap 28, and the magnetic portions forming the magnetic path are two back yokes 26 on both sides. , 26 can form an operating part of a multi-stage rotating electric machine. Therefore, the iron loss is significantly reduced, and the efficiency can be increased and the temperature rise during the operation of the rotating electric machine can be reduced. If there are teeth on the stator core, the air gap magnetic flux pulsates during high speed rotation, and a considerably large eddy current is generated on the rotor surface. However, in this embodiment, since there is no tooth of the iron core, this eddy current is not generated and the efficiency is improved.

In the axial gap rotating electric machine, since the circumference on the inner diameter side is naturally shortened, the space at the end of the mold coil 25A is narrowed, and the number of windings of the coil cannot be increased. However, due to the above-mentioned effect of reducing iron loss, it is possible to manufacture a high-frequency driven, ultra-high speed, multi-pole rotating electric machine. When the number of poles is increased, the end of the mold coil 25A becomes shorter, and the number of windings of the coil is increased. To increase the output.

The back yoke 26 is formed by spirally winding a strip-shaped silicon steel plate 26a having a thickness of 0.2 mm, sandwiching it between the outer peripheral ring 26b and the inner peripheral ring 26c, and fixing the iron yoke by the eddy current generation. It controls the loss.

In the molds 25A and 25B, the soft magnetic material forming the magnetic path is only the back yoke 26, and the magnetic air gap seen from the mold coils 25A and 25B becomes considerably large. Therefore, the inductance of the mold coils 25A and 25B becomes considerably small, the voltage drop of the inductance becomes small, and at the same time the terminal voltage becomes small. Therefore, the drive power source can be downsized.

Further, when the magnetic gap becomes large, the armature reaction by the mold coils 25A and 25B also becomes small, so that it is possible to prevent demagnetization of the permanent magnet 30 in the rotor and to allow a large current to flow. Become.

Although the embodiment described above shows the case where two rotor disks 29 are attached to the rotor 22, it is needless to say that a configuration in which one rotor disk 29 is attached is also possible. . Naturally, in this case, the mold coil 25A
Is not provided, and the stator frame 23 does not need to be divided into two.

Next, an embodiment in which the stator is divided into two as shown in FIG. 8 and the mold coil and the back yoke to be mounted on the bracket side are manufactured separately from the bracket and mounted on the bracket via bolts explain. FIG. 9 is a sectional view of the upper half portion of this embodiment.

In FIG. 9, reference numeral 35 denotes an axial gap rotating electric machine, which is composed of a stator 36 and a rotor 37 rotatably attached to the stator 36 via bearings. .

In this structure, the stator 36 is formed of a fiber reinforced epoxy resin by molding, and has a structure in which the stator frame 38 is divided into upper and lower parts in a plane including the shaft center of the rotor 37, and the shaft of the stator frame 38. Brackets 39, 39 attached to both ends in the direction through bolts, formed by molding with fiber reinforced epoxy resin, and divided into two parts vertically in a horizontal plane including the axis of the rotor 37.
2, a mold coil 25A shown in FIG. 2 which is attached to the axial center of the stator frame 38 via a bolt and is vertically divided into two, and a bracket so as to face the mold coil 25A via a rotor disk described later. The molded coil 25C is mounted on the bracket 39 via a bolt, and the back yoke 40 is mounted on the bracket 39 via a bolt and is inserted into a recess provided on the bracket 39 so as to be outside the molded coil 25C. Has been done. Here, the back yoke 40 is vertically divided into two parts as shown in FIGS. 10 and 11, and a silicon steel plate 40a having a thickness of 0.2 mm is formed.
Is wound in a spiral shape, and the ring 40 is
The structure is such that it is sandwiched between b and 40c and fixed.

The rotor 37 is arranged so as to form voids 42, 42 with the rotating shaft 41 and the mold coils 25A, 25C at the axially intermediate portion of the rotating shaft 41, and rotate integrally with the rotating shaft 41. 2 rotor disks mounted so that
It is composed of 9 and 29. Where the rotor disk 29
Includes a plurality of rod-shaped permanent magnets 30 that are magnetized in the axial direction.
A ring (not shown) having a key groove (not shown) that engages with a key (not shown) for rotating integrally with the rotating shaft 41. No) is provided integrally. In addition, a spacer 31 is inserted between the rotor disks 29, and the outer surface of each rotor disk 29 is pressed toward the center by a ring-shaped retainer 32.

Next, the stator is divided into two, four mold coils are mounted on the stator side, three rotor disks corresponding to this are mounted on the rotor side, and mold coils and back yokes mounted on the bracket side are respectively used as a bracket. An example manufactured separately will be described. Figure 12
[FIG. 4] is a cross-sectional view of the upper half of this embodiment.

In FIG. 12, reference numeral 45 denotes an axial gap rotating electric machine, which is composed of a stator 46 and a rotor 47 rotatably attached to the stator 46 via a bearing.

In this structure, the stator 46 is formed by molding with a fiber reinforced epoxy resin, and has a structure in which the stator frame 48 is vertically divided into two in a plane including the shaft center of the rotor 47, and the stator frame 48. Brackets 49, 49 mounted on both axial ends via bolts, formed by molding with fiber reinforced epoxy resin, and divided vertically into two in a plane including the shaft center of the rotor 47.
And a molded coil shown in FIG. 2 which is attached to an axially intermediate portion of the stator frame 48 so as to face each other via a rotor disk described later through a bolt, and which is vertically divided into two.
25A, 25A, a mold coil 25D attached to the bracket 49 via bolts so as to face the respective mold coils 25A via a rotor disk described later, and the mold coils 25D and the recesses provided in the bracket 49. , And a back yoke 40 attached to the bracket 49 via bolts.

The rotor 47 is arranged so as to form a gap 55, 51 with the molded coil 25A, 25C at the axially intermediate portion of the rotary shaft 50, and the rotary shaft 50.
Three rotor disks mounted so as to rotate together with
It is composed of 29, 29 and 29. Here, a plurality of rod-shaped permanent magnets 30 magnetized in the axial direction are attached to the rotor disk 29 so as to penetrate in the axial direction so as to be integrated, and the rotor disk 29 rotates integrally with the rotary shaft 50. A ring (not shown) having a key groove (not shown) to be engaged with a key (not shown) is provided integrally. A spacer 31 is inserted between the rotor disks 29, and the outer surface of the rotor disk 29 arranged on the outer side is pressed to the center side by a ring-shaped press fitting 32.

In addition, in order to withstand further high speed rotation, as shown in FIG. 13, the permanent magnets 30 attached to the rotor disk 29 may have different diameters on the outer peripheral side and the inner peripheral side. That is, the diameter of the permanent magnet 30a on the outer peripheral side is made smaller than the diameter of the permanent magnet 30b on the inner peripheral side. Alternatively, the rotor disk may be made of a non-magnetic metal having a small specific gravity, such as duralumin, instead of the fiber reinforced resin. Instead of molding the molding coil with resin, semiconductor technology is applied and a thin electric disk is applied. A semi-circular coil in which a conductive wire is printed and printed may be laminated on an insulating substrate. Further, not only the back yoke but also the stator iron core provided with teeth as in a general rotating electric machine can be used for the stator, and the effect of the present invention can be obtained in large capacity and high speed rotation. However, there are problems such as increase in iron loss, influence of armature reaction, and increase in bearing load due to increase in magnetic attraction in the thrust direction.

[0058]

As described above, according to the present invention, since the disk body, which is the main constituent part of the rotor, is made of resin, the inertia of the rotor can be greatly reduced, and ultra-high speed rotation, rapid acceleration / deceleration, and small size can be achieved. Can be realized. Further, by forming the stator frame, the bracket, and the like with resin, the metal portion is limited to a slightly limited portion, and the weight can be significantly reduced, and the weight of the rotating electric machine itself also becomes a load. The output can be effectively used when it is applied to the servo motor, the drive motor of the electric vehicle, and the like. Further, by forming the stator in a divided structure, it is possible to provide an axial gap rotating electric machine in which the coils of the stator and the disc bodies of the rotor are alternately arranged in multiple stages with a gap therebetween, thereby achieving a large output and easy maintenance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an upper half portion of an embodiment of the present invention by cutting.

FIG. 2 is a configuration diagram of a mold coil used in one embodiment of the present invention.

FIG. 3 is a front view of a back yoke used in one embodiment of the present invention.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a configuration diagram of a rotor disk used in an embodiment of the present invention.

FIG. 6 is an explanatory view showing the operation of one embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an operation of an embodiment of the present invention which is different from FIG.

FIG. 8 is an explanatory diagram showing a schematic configuration of another embodiment of the present invention.

FIG. 9 is a sectional view showing an upper half portion of another embodiment of the present invention by cutting it.

FIG. 10 is a front view of a back yoke used in another embodiment of the present invention.

FIG. 11 is a view on arrow BB in FIG.

FIG. 12 is a cross-sectional view of an upper half portion of another embodiment of the present invention.

FIG. 13 shows a rotor disk used in each embodiment of the present invention.
Diagram of a rotor disc different from the above.

FIG. 14 is a cross-sectional view in which the upper half of a conventional cylindrical permanent magnet rotating electric machine is cut.

FIG. 15 is an explanatory diagram showing a schematic configuration of a conventional axial gap rotating electric machine.

[Explanation of symbols]

20, 35, 45 ... Axial gap rotating electric machine, 21, 36, 46
... Stator, 22, 37, 47 ... Rotor, 23, 38, 48 ... Stator frame, 24, 39, 49 ... Bracket, 25A, 25B, 25
C, 25D ... Molded coil, 26,40 ... Back yoke, 2
7, 41, 50 ... Rotating shaft, 28, 42, 51 ... Air gap, 29 ... Rotor disk, 30 ... Permanent magnet.

Claims (12)

[Claims] 1. A stator comprising a disk-shaped coil, a magnetic steel plate spirally wound in the vicinity of the coil, and back yokes having no slots arranged at both axial ends of a stator frame, and a resin. A disk body, which is formed in a disk shape and is arranged so as to form an air gap in the axial direction with the coil, and which is fixed by axially penetrating a permanent magnet magnetized in the axial direction, rotates integrally with the rotating shaft. An axial gap rotating electric machine comprising a rotor mounted as described above. 2. A back which has three or more coils formed in a disk shape, two of which are formed by spirally winding a magnetic steel plate around brackets at both axial ends of a stator frame and having no slots. The stator is disposed on the yoke, and the other coils are vertically divided into two in a plane including the axis of the rotating shaft, and the stator is disposed in the axially intermediate portion of the stator frame. , Two or more disk bodies arranged so as to form an air gap with the coil in the axial direction and fixed by penetrating the permanent magnet magnetized in the axial direction in the axial direction to rotate integrally with the rotary shaft. An axial gap rotating electric machine characterized by comprising a rotor mounted on the. 3. A disk-shaped three or more coil having two or more coils, two of which are formed by spirally winding a thin steel plate on brackets at both axial ends on a back yoke having no slots. A coil, a bracket, a back yoke, and a stator frame, which are vertically divided into two parts in a plane including the axis of the rotating shaft, and a coil. The two rotors are formed in a disk shape and are arranged so as to form an air gap in the axial direction with the coil, and axially magnetized permanent magnets are axially penetrated and fixed. An axial gap rotating electric machine, comprising: a rotor mounted on the rotor so as to rotate integrally therewith. 4. The axial gap rotating electric machine according to claim 1, wherein the disk body is made of a non-magnetic light metal. 5. The axial gap rotating electric machine according to claim 1, wherein the stator frame and the bracket are made of resin. 6. The axial gap rotating electric machine according to claim 1, wherein the permanent magnet is divided into a plurality of pieces for each pole and is fixed by penetrating the disk body in the axial direction. 7. The columnar permanent magnet is divided into a plurality of pieces for each pole and is fixed by penetrating the disc body in the axial direction.
The axial gap rotating electric machine according to claim 3. 8. A cylindrical permanent magnet is divided into a plurality of magnets for each pole, and the diameter of the fixed member fixed to the outer peripheral side of the disk is smaller than that of the inner peripheral side. Axial gap rotating electric machine described. 9. A plurality of column-shaped permanent magnets are divided into a plurality of column-shaped permanent magnets for each pole, and the respective column-shaped permanent magnets are fixed and penetrated through the disc in a predetermined arrangement. The axial gap rotating electric machine according to any one of claims 1 to 3, wherein the center of the magnetic pole of each disk is slightly displaced to reduce the torque ripple. 10. The axial gap rotating electric machine according to claim 1, wherein a thin magnetic steel plate is spirally wound into a disk shape and a back yoke having no slot is mounted. 11. The axial gap rotating electric machine according to claim 1, wherein a coil having one-sided winding that can be divided in the circumferential direction is mounted. 12. The axial gap rotating electric machine according to claim 1, further comprising a concentrically wound coil that can be divided in a circumferential direction.