CN109075680B

CN109075680B - Rotary generator

Info

Publication number: CN109075680B
Application number: CN201780022715.9A
Authority: CN
Inventors: 宫林正仁郎
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-24
Filing date: 2017-06-26
Publication date: 2020-08-14
Anticipated expiration: 2037-06-26
Also published as: CN109075680A; JPWO2017222081A1; WO2017222081A1; JP6346385B2

Abstract

The invention provides a generator which can reduce the generation of cogging torque, generate power with a small amount of energy and realize more stable operation when generating power with variable wind power. The rotor includes a pair of planar first members made of a soft magnetic material and a plurality of cylindrical second members made of a soft magnetic material, the first members are arranged with a gap from the permanent magnets so that the longitudinal extensions of the permanent magnets of the rotor intersect the plane, and the second members are arranged so that both ends of the cylinders are in contact with the plane of the first members and are parallel to the direction of the rotation axis.

Description

Rotary generator

Technical Field

The present invention relates to a rotary generator in which a plurality of permanent magnets are rotationally vibrated as a rotor, magnetic flux generated by the permanent magnets is guided to an iron core on a stator side, and electric power is induced to a coil applied to the iron core.

Background

In a conventional rotating electrical machine, for example, a generator, energy such as water power and thermal power is converted into rotational kinetic energy, and the converted rotational kinetic energy is used to drive the generator to generate electricity. A generator generally used includes a rotor having N-pole and S-pole permanent magnets mounted on a rotating shaft, an armature core having magnetic poles corresponding to the number of magnetic machines formed by the permanent magnets, and a generating coil wound around the armature core, and the rotor is rotationally driven to generate an ac magnetic field in the armature core and generate an ac voltage at the generating coil by the generated ac magnetic field.

In order to supply a sufficient magnetic field to a coil wound around an armature core, it is desirable that an armature core constituting a rotating electrical machine such as a generator or a motor is disposed close to a magnet attached to the rotor. When the permanent magnet is disposed close to the armature core, an attractive force acts between the permanent magnet and the core. When a strong permanent magnet is used to increase the output of the rotary generator, the attractive force becomes an extremely large value.

Further, this attractive force varies depending on the rotation angle of the rotor, and affects the rotation torque of the rotor. The cogging effect is generated by the magnetic resistance between the armature and the rotor, and the generation becomes unstable due to a large amount of pulsation. For example, in a generator used for wind power generation or the like, a starting torque increases when a rotor starts to operate. In addition, the resistance for continuously rotating the rotor also becomes large. Therefore, power cannot be generated by a small amount of rotational kinetic energy.

In order to reduce torque ripple of a type called cogging torque, the following document 1 discloses a method in which a rotor is constituted by a plurality of stages of rotors, and the positions of the stages are shifted in the circumferential direction and inclined.

Further, the following document 2 discloses another technique in which an iron core (coreless) is not used in order to suppress an abnormality caused by the cogging.

Documents of the prior art

Patent document

Patent document 1 japanese patent application laid-open No. 2010-119192

Patent document 2 Japanese patent laid-open No. 2009-124800

Disclosure of Invention

Problems to be solved by the invention

However, in the invention of patent document 1, when the inclination angle or the number of inclination steps is changed, it is necessary to newly manufacture a product such as a mold for a rotor core made of a laminated steel plate or the like. Alternatively, in order to manufacture a rotor having a plurality of inclination angles, a plurality of molds or the like separately manufactured in accordance with the number of inclination stages or the setting of the inclination angles are required. In addition, in the method of patent document 2, although an effect is obtained in reducing the rotational torque or reducing the cogging, there is a problem that the amount of power generation becomes smaller as compared with a generator having an iron core.

In addition, in the conventional wind power generation, the operation is stopped during the period when weak wind blows. Or to cope with weak wind power by downsizing the wind power generation motor. Thus, there is also a problem that: sufficient power generation can be expected only in areas where stable strong winds can be expected.

In view of the problems of the conventional techniques, it is an object of the present invention to provide a generator capable of generating power with a small amount of energy while reducing the occurrence of cogging, and capable of operating more stably when generating power with wind power that changes every moment.

Means for solving the problems

The present inventors have found that the cogging effect is greatly reduced and sufficient magnetic force can be transmitted by guiding both the magnetic force centers through a soft magnetic material, without facing the magnetic force center of the magnet disposed in the rotor and the magnetic force center magnetized by the impedance generated in the coil according to the rotation of the rotor, and thus, sufficient magnetic force cannot be completely transmitted to both ends of the coil.

That is, according to one aspect of the present invention, a rotary electric generator includes a rotor and a cylindrical permanent magnet disposed on the rotor, and a longitudinal direction of the permanent magnet and a magnetic flux direction of the permanent magnet coincide with an axial direction of a rotation shaft of the rotor, the rotary electric generator includes: a pair of planar first members made of soft magnetic material bodies and a plurality of cylindrical second members made of soft magnetic material bodies, wherein the first members are arranged with a gap from the permanent magnets in such a manner that the extension lines of the permanent magnets of the rotor in the longitudinal direction cross the plane, and the second members are arranged in such a manner that both ends of the cylindrical second members are abutted against the plane of the first members and are parallel to the direction of the rotation axis.

Effects of the invention

According to the present invention, there is provided a generator capable of generating power stably with a small amount of rotational kinetic energy while significantly reducing cogging.

Drawings

Fig. 1 is a diagram showing a structure of a generator in a case where a permanent magnet is cylindrical.

Fig. 2 is a diagram showing a structure of a generator in the case where the permanent magnet is a ring type.

Fig. 3 is an exploded assembly view showing a generator according to embodiment 1.

Fig. 4 is a view showing a structure of a rotor according to embodiment 1.

Fig. 5 is a view showing the structure of an armature of the present invention.

Fig. 6 is a view showing the structure of the first member of embodiment 1.

Fig. 7 is a diagram showing the principle of the electromotive force excitation to the armature in embodiment 1.

Fig. 8 is a diagram of stacking power generating portions of the present invention.

Fig. 9 is a conceptual diagram of a power generating portion using the present invention.

Fig. 10 is an exploded assembly view showing the generator of embodiment 2.

Fig. 11 is a view showing a structure of a rotor according to embodiment 2.

Fig. 12 is a view showing the structure of the first member of embodiment 2.

Fig. 13 is a conceptual diagram showing a generator according to embodiment 3.

Fig. 14 is a conceptual diagram showing a generator according to embodiment 4.

Fig. 15 is a conceptual diagram showing a generator according to embodiment 5.

Fig. 16 is a conceptual diagram showing a generator according to embodiment 5.

Fig. 17 is a view showing the structure of the first member of embodiment 6.

Fig. 18 is a conceptual diagram showing a generator according to embodiment 6.

Detailed Description

The present invention will be described in detail below. The description of the materials, methods, numerical ranges, and the like described in the present specification is not intended to be limited to the materials, methods, numerical ranges, and the like, and does not exclude the use of other materials, methods, numerical ranges, and the like.

In the present invention, the first member is a member that is a soft magnetic body having a shape such as a flat surface or a cylindrical shape. In addition, all or a part of the trajectory (hereinafter, referred to as a rotation trajectory) accompanying the rotation of the permanent magnet must be included in the first member. In other words, the shape of the first member is not particularly limited as long as it includes all or a part of the rotation locus. The gap is a distance between the first member and the permanent magnet.

Fig. 1 is a conceptual diagram of a generator according to the present invention using a cylindrical permanent magnet 2 and a pair of planar members as

first members

5 and 8. Fig. 1(a) is a view showing directions of a permanent magnet 2 disposed on a rotor 3 and a magnetic flux 4 with respect to a rotating shaft 1. Fig. 1(b) is a plan view of fig. 1 (a). Fig. 1 c is a view showing a state where the

first members

5 and 8 are arranged at positions where the longitudinal direction extensions of the permanent magnets of the rotor (coinciding with the direction of the magnetic flux 4) intersect with the plane with a gap therebetween, and a state where the second member is arranged at a position parallel to the axial direction of the rotating shaft 1 with both ends of the cylinder abutting against the first plane. Fig. 1(c) is a diagram showing that the rotation locus 6 is entirely contained in the first member.

Fig. 2 is a conceptual diagram of the present invention in the case of using the ring-shaped permanent magnet 9 and the cylindrical member as the first member 13. The height of the first member 13 is larger than the height of the permanent magnet 9 and larger than the outer diameter of the permanent magnet 9. Fig. 2(a) is a view showing directions of the permanent magnet 9 and the magnetic flux 10 arranged on the rotor 3 with respect to the rotating shaft 1. Fig. 1(b) is a diagram showing the rotation locus 11, and shows a diagram in which the rotation locus 11 is included in the first member 13 in cooperation with fig. 2 (c). Fig. 2(c) is a diagram showing a state where the first member 13 is disposed with a gap from the permanent magnet 9 and the second member 12 abuts on the outer side of the first member 13, where the abutting position is a position shifted from a region where the magnetic fluxes of the first member 13 and the permanent magnet 10 oppose each other. The diameter of the second member 12 is smaller than the difference between the height and width of the first member 13 and the height and width of the permanent magnet 9.

Here, the position deviated from the region where the first member 13 opposes the magnetic flux of the permanent magnet 9 will be described in detail. The height of the first member 13 is larger than the height of the permanent magnet 9. Therefore, there is a range where the magnetic fluxes of the permanent magnets 9 do not intersect. The relevant ranges are collectively referred to as offset positions.

The second member is a so-called iron core for use as an armature. As will be described later, in the present invention, the armature means one formed by winding the power generating coil around the second member. The shape may be circular, triangular, or fan-shaped, and is not particularly limited. Specifically, the reference numeral 7 in fig. 1 is provided at such a position that the center of magnetization due to the resistance generated in the armature accompanying the rotation of the rotor does not face the center of the magnetic flux of the permanent magnet. Further, in the generator related to fig. 1, it is also used as a member for joining the

first members

5 and 8.

In fig. 2, the second member is 12, and by abutting the second member at the position 13, that is, at a position offset from the region opposing the magnetic flux of the permanent magnet, the center of magnetization due to the resistance generated in the armature by the rotation of the rotor can be prevented from facing the center of the magnetic flux of the permanent magnet.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(embodiment 1)

Fig. 3 is an exploded assembly view illustrating a generator according to embodiment 1, fig. 4 is a view illustrating a rotor 16 in which a permanent magnet shown in fig. 3 is embedded, fig. 5 is a view illustrating an armature 17 shown in fig. 3, and fig. 6 is a view illustrating a soft magnetic material element 18 shown in fig. 3.

Fig. 4 shows a rotor 16 according to the present embodiment. The number of permanent magnets in the present embodiment is 4, but is not particularly limited. On the rotor produced by 3D printing, the permanent magnet 15 is embedded in a hole 21, which is approximately equal to the diameter of the permanent magnet and which penetrates therethrough, in such a way that the N and S poles alternate. At this time, the position where the hole 22 is provided is penetrated so that the center angle θ with respect to the adjacent permanent magnet satisfies the relationship of θ 2 pi/n, as in the case where the number of permanent magnets used in fig. 4(b) is n. The hole 23 is through which the rotation shaft passes.

Further, the magnet may be pressed by a circular plate 24 made of stainless steel or the like as shown in fig. 7(c) so that the magnet does not fall during rotation. Hereinafter, a member used for the related purpose is referred to as a connecting member. The permanent magnets used are ferrite magnets, Sm — Co magnets, neodymium magnets, etc., and may be selected according to the desired power generation characteristics of the power generation element, but neodymium magnets are used in the examples. Instead of the permanent magnets, electromagnets connected through slip rings may be used. The material of the rotor is not particularly limited, and ABS resin, polypropylene, nylon, gypsum powder, laminated silicon steel plate, aluminum, or the like can be used. In the present embodiment, the rotor is manufactured by 3D printing, but may be manufactured by other methods.

Fig. 5 shows a process of assembling the armature 17 when the soft magnetic material body on the cylinder is used as the 2 nd member. The power generation coil 26 is wound around an iron core having iron washers 25 of 22mm in outer shape and 10mm in inner diameter, which are made of iron, at both ends of an 8M-sized cylinder made of a soft magnetic material. At this time, the length of the cylinder in the longitudinal direction is noted to be slightly longer than the height of the rotor. Since this difference determines the size of the air gap (air gap) described later. Further, when the number of turns of the coil is increased, a cylinder having a shorter diameter can be selected.

Fig. 6 is a circular plate according to an embodiment of the first member of the present invention. The rotor 3 and the armature 12, on which the permanent magnets are disposed, are fixed to the rotating shaft 1 with a gap therebetween at a position perpendicular to the magnetic flux vertical direction of the magnets, that is, at a position in the vertical direction opposite to the permanent magnets 2 (hereinafter, when fixing, it means fixing by screws, fixing collars, the aforementioned connecting members, etc., and fixing by various known means). The hole 27 is provided for fixing the post and the armature to each other using a hole. In the first embodiment, the rotation locus 28 of the permanent magnet is shown by a broken line. When the number of the armatures to be used is n, the holes 27 are formed so as to penetrate through the adjacent armatures at a position where the center angle θ satisfies the relationship of 2 pi/n. As the magnetic material of the soft magnetic material that can be used, iron, silicon steel, permalloy, amorphous, or a composite laminate thereof may be used, but in the present embodiment, iron is used.

The structure of the generator of the present invention will be described in detail with reference to fig. 3. First, the rotary shaft 1 and the support column 14 are erected on the table 20. Subsequently, the disc-shaped soft magnetic body 19 is fixed to the rotating shaft 1 and the support column 14. The center of the rotor 16 is inserted through the rotating shaft 1 and fixed to the soft magnetic body 19 with a gap therebetween. Then, the armature 17 is inserted through the support column 14 and fixed in abutment with the soft magnetic body 19. Next, the soft magnetic body 18 is abutted against the armature 17 and is disposed at a gap from the permanent magnet 15. At this time, the distance between the permanent magnet 15 and the soft magnetic element 19 and the distance between the permanent magnet 15 and the soft magnetic element 18 become the air gap 29. The size of the gap is preferably about 1mm or less, and the smaller the gap is, the better the gap is.

The principle of exciting an electromotive force in the armature 17 will be described with reference to fig. 9. In the state where the rotating shaft is stopped, the generator is in a state where the magnetic flux of the permanent magnet magnetizes the soft

magnetic bodies

18 and 19 provided with the gaps therebetween in the vertical direction. When rotational kinetic energy is applied to the rotating shaft 1, the rotor 16 rotates with the rotation of the rotating shaft 1, and the magnetic field of each of the soft

magnetic elements

18 and 19 changes. Then, since the soft

magnetic bodies

18 and 19 abut against the armature 17, the power generating coil on the armature 17 receives the magnetic field changes of the respective portions of the soft

magnetic bodies

18 and 19. That is, by the rotation of the rotating shaft 1, a magnetic circuit is formed that passes through the permanent magnet → the soft magnetic body 18 → the armature 17 → the soft magnetic body 19, and an electromotive force is excited in the generating coil. In this case, an ac output can be obtained from the power generation coil.

By rotating the permanent magnets 15 and the soft

magnetic bodies

18 and 19 at equal distances and not causing the magnetic force center of the permanent magnets 15 of the rotor 16 to face the center of the magnetic field generated by the impedance generated in the power generation coil as the rotor 16 rotates in this manner, a strong cogging effect is not generated and the cogging effect can be greatly reduced. As a result, it is possible to generate power even with weak wind, which is a very low rotational kinetic energy, and to perform more stable operation in the case of wind power generation that varies every moment.

The present invention may be configured in a multi-stage configuration as shown in fig. 8, with the power generating portion 30 shown in fig. 7 as a unit configuration unit. By configuring the generator as a multi-stage configuration (the rotor and the like are not shown in fig. 11), the output of the entire generator can be increased. That is, in order to solve the problem of increasing the output of the generator, it is possible to adopt a method of increasing the number of armatures in the unit constituent element, increasing the number of the unit constituent element itself, or combining these.

As shown in fig. 9, the portion shown in fig. 8 can be used as the strut portion for the wind power generation. That is, the strut portion of the wind power generation can be effectively used as a portion for power generation. Further, by providing a capacitor (not shown) in the vicinity, the electric power generated by the generator of the present invention can be stored.

Further, the output of the rotary generator of the present invention is determined by the size of the pole, the length of the rotary shaft, the size of the first member, the size of the permanent magnet, and the like, and a combination thereof. Therefore, it is possible to make appropriate design changes according to the intended output, and it is also possible to contribute to an improvement in the degree of freedom in setting the generator.

(embodiment 2)

FIG. 10 shows embodiment 2 of the present invention. While the embodiment shown in fig. 3 is configured as a magnet rotor inner rotor type (inner rotor type) in which the rotor rotates inside the armature, the present embodiment is configured as a magnet rotor outer rotor type (outer rotor type) in which the rotor rotates outside the armature.

The structure of the generator according to the present invention will be described in detail below with reference to fig. 10. First, the rotary shaft 1 and the support 8 are erected on the table 9. Subsequently, the disc-shaped soft magnetic body 32 is fixed to the rotating shaft 1 and the support 8. Next, the rotor 31 is fixed at a position close to the soft magnetic body 5. Then, the armature 17 is inserted through the support 8 and fixed in abutment with the soft magnetic body 32. Next, the soft magnetic body 5 is abutted against the armature 17 and brought close to the permanent magnet 34. At this time, the distance between the permanent magnet 34 and the soft magnetic element 32 and the distance between the permanent magnet 34 and the soft magnetic element 33 are air gaps, respectively. The size of the air gap is preferably about 1mm or less, and the smaller the size is, the better the size is.

Fig. 11 shows a rotor 31 according to embodiment 2. The armature 17, the rotary shaft 1, and the support 8 are housed in the hole 38. A portion (not shown) linking the rotor and the rotating shaft is necessary, and the shape and the like thereof are not particularly limited. The material, the arrangement of the holes, and the like are not different from those of the rotor used in the first embodiment.

Fig. 12 shows soft

magnetic bodies

32 and 33 according to embodiment 2. In the soft magnetic material element (first member) of the present embodiment, the armature 17 is disposed inside the rotor, and therefore the hole 40 is provided at a corresponding position. The rotation locus in this embodiment is 39. Further, there is no place where the material, the arrangement of the holes, and the like are different from the soft magnetic material member (first member) used in embodiment 1.

In such a configuration, the power generating portion shown in fig. 13 can be used as a unit constituting unit. The same materials as those of the permanent magnet, the rotor, the soft magnetic material, and the like described in embodiment 1 can be used, and the same effects as those described in the same embodiment can be obtained.

(embodiment 3)

Fig. 13 is a diagram illustrating the generator of the present invention illustrated in fig. 2 in further detail. The structure of the present embodiment will be described in detail below with reference to fig. 13. The generator of the present embodiment is a rotary generator including a cylindrical rotor 42 and an annular permanent magnet 41 disposed on the rotor 42, and the magnetic flux direction of the permanent magnet is orthogonal to the rotation axis.

The first member 43 is composed of a soft magnetic body having a diameter width smaller than the inner circle width of the permanent magnet 41 and a height width larger than the height width of the permanent magnet. The second member is a member made of a cylindrical soft magnetic body having a diameter smaller than the difference between the height width of the first member and the height width of the permanent magnet, and a power generating coil is wound around the second member to serve as the armature 17. The first member 43 is disposed with a gap from the permanent magnet 41, and the armature 17 abuts against the inner side of the first member at a position shifted from the region where the first member opposes the permanent magnet. The gap in the present embodiment is 44, and the rotation locus in the present embodiment is 45.

(embodiment 4)

FIG. 14 shows embodiment 4 of the present invention. In the embodiment shown in fig. 13, the rotary generator is a magnet rotor inside rotation type (inner rotor type) in which the rotor rotates inside the armature, but in the present embodiment, the rotor is a magnet rotor outside rotation type (outer rotor type) in which the rotor rotates outside the armature.

The structure of the present embodiment will be described in detail below with reference to fig. 14. The generator of the present embodiment is a rotary generator including an annular rotor and an annular permanent magnet disposed on the rotor, and in which the magnetic flux direction of the permanent magnet is orthogonal to the rotation axis.

The first member 47 is composed of a soft magnetic body having a diameter width smaller than the inner circle width of the permanent magnet 46 and a height width larger than the height width of the permanent magnet. The second member is a member made of a cylindrical soft magnetic body having a diameter smaller than the difference between the height width of the first member and the height width of the permanent magnet, and a power generating coil is wound around the second member to serve as the armature 17. The first member 47 is disposed with a gap from the permanent magnet 46, and the second member 17 abuts against the inner side of the first member, wherein the abutting position is a position shifted from the area where the first member opposes the permanent magnet. The gap in the present embodiment is 48, and the rotation locus in the present embodiment is 45.

In such a configuration, the power generating portion shown in fig. 14 can be used as a unit constituting unit. The same materials as those of the permanent magnet, the rotor, the soft magnetic material, and the like described in embodiment 1 can be used, and the same effects as those described in the same embodiment can be obtained.

(embodiment 5)

FIGS. 15 and 16 show embodiment 5 of the present invention. The structure of the generator of the present invention will be described in detail with reference to fig. 15 and 16. First, the rotary shaft 49 and the support 50 are erected on a table (not shown). Next, the center 52 of the rotor 51 is fixed through the rotation shaft 49. Next, a disc-shaped soft magnetic body 53 as a first configuration is fixed to the support 50 with a gap between the rotor 51 and the disc-shaped soft magnetic body. Next, the center 56 of the rotor 55 is inserted through the rotating shaft 49 via the connecting member 54 and fixed to the soft magnetic body 53 with a gap therebetween. At this time, the N-pole and N-pole, and the S-pole and S-pole of the magnets of the rotor 51 and the rotor 55 are fixed to face each other. Subsequently, the armature 57 is fixed through the soft magnetic body 53. At this time, the distance between the permanent magnet 58 and the soft magnetic body 53 and the distance between the permanent magnet 59 and the soft magnetic body 53 are gaps 60, respectively. The size of the gap is preferably about 1mm or less, and the smaller the gap is, the better the gap is. In addition, the permanent magnets are embedded in holes penetrating the rotor so that the N poles and S poles alternate and the permanent magnets have a diameter approximately equal to the diameter of the permanent magnets. The number of permanent magnets in the present embodiment is 12, but is not particularly limited.

In this way, by the structure in which the first member is sandwiched by the pair of rotors, the amount of power generation can be significantly increased (compared to the first embodiment). This is presumed as follows. In the first aspect, the armature receives the magnetic field change through the first member, so that the timing of the magnetic field change is blurred, and the timings of the magnetic fields of the respective first members are not synchronized with each other above and below the armature. Further, since the number of the first members is halved, the force of the magnet to attract the ring is also halved, and as a result, the rotation resistance is reduced and the number of rotations is increased.

Next, the N-pole and N-pole, and the S-pole and S-pole of the magnets of the rotor 51 and the rotor 55 are fixed to face each other. That is, the rotational resistance can be greatly reduced by providing the magnetic poles of the one rotor so that the same magnetic poles of the other rotor face each other. This is conceivable because the permanent magnets are in a repulsive state through the first member.

As described above, since there is a gap between the permanent magnet and the first member, a fixed rotational resistance corresponding to the resistance of the armature is always generated in the generator. Therefore, the rotational resistance reduction method in the present embodiment contributes to the improvement of the performance of the generator.

Further, when the rotation resistance from the stop is measured by a digital torque driver (TONE corporation, manufactured by TONE corporation, No. DBDT3S), the rotation resistance cannot be measured. Since the lower limit of the measurement of the digital actuator is 30cn.m, the rotation resistance at the time of stopping can be said to be a value smaller than this value.

In the present embodiment, as in the case of the above-described embodiment 2 corresponding to the above-described embodiment 1, a magnet rotor outer rotor type (outer rotor type) in which a rotor (rotor) rotates outside an armature may be configured.

(embodiment 6)

FIG. 18 shows embodiment 6 of the present invention. In the present embodiment, the linear type generator is configured such that the armature receives a change in magnetic flux of the first member by the linear movement of the linearly arranged rotor, and an electromotive force is excited in the armature, thereby obtaining an ac output from the armature.

The structure of the present embodiment will be described in detail below with reference to fig. 17 and 18. The generator of the present embodiment includes a pair of linear rotors and permanent magnets arranged on the rotors, and the linear drive device 66 is connected to the linear rotor type rotary generator.

Although the form of the first member 61 is not particularly limited, it has at least a portion higher than the height direction of the rotor, and the portion needs to have a sufficient area for connecting the armature. The specific shape is a rectangle. Fig. 17 shows the first member when the first member is rectangular. The first member 61 is fixed to a position spaced apart from the pair of linear rotors by a gap, and the armatures 62 are fixed to both surfaces of the first member 61 at positions offset from regions opposed by the permanent magnets of the first member 61 and the pair of rotors 64. In fig. 17, although the armature is fixed at one position, the armature may be fixed at any position as long as the armature is displaced from the permanent magnet opposing region. The gap in the present embodiment is 65, and the rotation locus in the present embodiment is 63.

The permanent magnets disposed in the pair of rotors are preferably arranged so that the same magnetic poles of one rotor face the same magnetic poles of the other rotor.

In this embodiment, the same materials as those of the permanent magnet, the rotor, the soft magnetic material, and the like described in embodiment 1 can be used, and the same effects as those described in the same embodiment can be obtained.

Claims

1. A rotary generator having a rotor and a cylindrical permanent magnet disposed on the rotor, wherein a longitudinal direction of the permanent magnet and a magnetic flux direction of the permanent magnet coincide with an axial direction of a rotating shaft of the rotor, the rotary generator comprising:

a pair of planar first members composed of soft magnetic bodies, and

a plurality of cylindrical second members composed of soft magnetic bodies,

the first member is disposed with a gap from the permanent magnets so that the longitudinal extensions of the permanent magnets of the rotor intersect the plane, and the second member is disposed so that the both ends of the cylindrical tube are in contact with the plane of the first member and are parallel to the direction of the rotation axis.

2. A rotary electric generator according to claim 1, wherein a plurality of permanent magnets are used as the permanent magnets.

3. A rotary electric generator according to claim 2, wherein the plurality of permanent magnets are disposed on the rotor at equal intervals.

4. A rotary electric generator according to any of claims 1 to 3, wherein the aforesaid first member is larger than the diameter of the rotor.

5. A rotary generator having a cylindrical rotor and an annular permanent magnet disposed on the rotor, the permanent magnet having a magnetic flux direction orthogonal to a rotation axis, the rotary generator comprising:

a cylindrical first member made of a soft magnetic material having a diameter width larger than an outer circumferential width of the permanent magnet and a height larger than a height of the permanent magnet; and

a second member composed of a plurality of cylindrical soft magnetic bodies having a diameter smaller than a difference between a height of the first member and a height of the permanent magnet;

the first member and the permanent magnets are arranged with a gap therebetween, and the second member is disposed at a position offset from a region where the first member and the permanent magnets oppose each other, the position being located outside the first member.

6. A rotary electric generator having an annular rotor and an annular permanent magnet disposed on the rotor, the permanent magnet having a magnetic flux direction orthogonal to a rotation axis, the rotary electric generator comprising:

a first cylindrical member made of a soft magnetic material having a diameter width smaller than the inner circumference width of the permanent magnet and a height larger than the height of the permanent magnet; and

the first member and the permanent magnets are arranged with a gap therebetween, and the second member is attached to the inside of the first member at a position offset from the region where the first member and the permanent magnets oppose each other.

7. A rotary generator having a rotor and a cylindrical permanent magnet disposed on the rotor, wherein a longitudinal direction of the permanent magnet and a magnetic flux direction of the permanent magnet coincide with an axial direction of a rotating shaft of the rotor, the rotary generator comprising:

a pair of the rotors;

a planar first member composed of a soft magnetic body; and

a plurality of cylindrical second members made of soft magnetic material bodies;

the first member is disposed between the rotor on one side and the rotor on the other side with a gap therebetween such that an extension line of the permanent magnet of the rotor in the longitudinal direction intersects with a plane,

the second members are fixed to both surfaces of the first member in pairs,

and is disposed in parallel with the direction of the rotation axis.

8. A rotary electric generator according to any one of claims 1 to 3, 5 to 7, wherein the aforementioned second member winds a generating coil serving as an armature.

9. A rotary generator according to any of claims 1 to 3, 5 to 7, wherein the aforementioned gap is below 1 mm.