JP2023154311A - Generator and wind power generation device - Google Patents

Abstract

To provide a generator that is small, lightweight, and has improved power generation efficiency.SOLUTION: A generator 1 includes a rotor 60 that holds a plurality of magnets 65 arranged in a circumferential direction around an axis A and is rotatable around the axis A, a plurality of teeth 32 arranged at a predetermined distance in the radial direction with respect to the rotor 60 and arranged in a circumferential direction around the axis A, and a stator having a coil 40 spirally wound around the teeth 32, and the electrical conductivity of the coil 40 varies continuously or intermittently depending on the position within the coil 40.SELECTED DRAWING: Figure 4

Description

The present invention relates to a generator and a wind power generator.

As for large-capacity generators used in wind power generators and the like, permanent magnet type generators using rare earth magnets are becoming popular (see Patent Document 1).

Japanese Patent Application Publication No. 2017-135937

However, these large-capacity generators are large and heavy, making them expensive to install and also expensive to maintain. Therefore, smaller and lighter generators are required to reduce installation costs and maintenance costs.

An object of the present invention is to provide a generator and a wind power generator that are small, lightweight, and have improved power generation efficiency.

In order to solve the above problems, the present invention holds a plurality of magnets arranged in a circumferential direction centering on an axis, a rotor rotatable around the axis, and a rotor having a diameter relative to the rotor. A generator comprising: a plurality of teeth arranged at a predetermined distance in a direction and arranged in a circumferential direction around the axis; and a stator having a coil spirally wound around the teeth. The present invention provides a generator in which the coil has electrical conductivity that varies continuously or intermittently depending on the position within the coil.

According to the present invention, it is possible to provide a generator and a wind power generation device that are small, lightweight, and have improved power generation efficiency.

FIG. 1 is a perspective view of a generator 1 according to an embodiment. 1 is an exploded perspective view of a generator 1. FIG. FIG. 3 is an exploded perspective view of a stator 30. FIG. 3 is a partial cross-sectional view of a stator 30 and a rotor 60. FIG. FIG. 3 is a perspective view of teeth 32, a coil 40 held by teeth 32, and a rod-shaped pressing member 33. FIG. 4 is a perspective view of a coil 40. FIG. FIG. 4 is a diagram showing an example of a method for manufacturing a coil 40. FIG. It is a figure explaining the skew angle (theta) of 62 A of 1st core members, the 2nd core member 62B, and 62 C of 3rd core members. FIG. 1 is a schematic diagram of a wind power generation device 100 using a generator 1 according to an embodiment.

[Configuration of generator 1]
Hereinafter, a generator 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a generator 1 according to an embodiment, and FIG. 2 is an exploded perspective view of the generator 1. The generator 1 of the embodiment has, for example, a diameter of about 628 mm and a length L of about 395 mm, although it is not limited thereto.

The generator 1 includes a front cover 10, a bus bar 20, a stator 30, a housing 50, a rotor 60, and a rear cover 80 along an axis A passing through the center. For convenience, the lower left in FIGS. 1 and 2 will be referred to as the front, and the upper right will be referred to as the rear.

[Housing 50]
The housing 50 is a substantially cylindrical member made of a metal material such as aluminum die-casting or aluminum, and has a storage space 51 therein. A stator 30 is arranged inside the storage space 51, a bus bar 20 is arranged in front of the stator 30, and a rotor 60 is arranged inside the stator 30.

[Front lid 10]
The front lid 10 is a substantially circular plate member, and a shaft hole 11 is provided in the center. A tip of a shaft 61 of a rotor 60 is rotatably inserted into the shaft hole 11 .

[Back cover 80]
The rear lid 80 is a substantially circular plate member, and a holding hole 81 is provided in the center. The rear end of the shaft 61 of the rotor 60 is rotatably held in the holding hole 81 .

[Stator 30]
The stator 30 is fitted into the inner surface of the housing 50 and fixed to the housing 50. FIG. 3 is an exploded perspective view of the stator 30. The stator 30 includes a stator ring core 31, a plurality of teeth 32 held on the inner surface of the stator ring core 31, a coil 40 wound around the outer circumference of each tooth 32, and a coil 40 on the rotor 60 side of the coil 40. It includes a rod-shaped holding member 33 that separates the end face from the end face of the teeth 32 on the rotor 60 side, and an annular holding ring 35 disposed in front of the stator ring core 31. The coil 40 and the teeth 32 are arranged in a number that is a multiple of three so that the coil 40 generates a three-phase current. Note that in FIG. 3, one coil 40, teeth 32, and two rod-shaped pressing members 33 are removed from the stator ring core 31, and the other coils 40, teeth 32, and rod-shaped pressing members 33 are removed from the stator ring core 31. A state where it is attached to a ring core 31 is shown.

[Stator ring core 31]
FIG. 4 is a partial cross-sectional view of the stator 30 and the rotor 60, perpendicular to the axis A. The stator ring core 31 is a cylindrical member as a whole, and a plurality of fitting grooves 31a extending in the length direction are provided on the inner surface. The number of fitting grooves 31a equal to the number of teeth 32 around which the coil 40 is wound is provided at equal intervals.

[Teeth 32]
FIG. 5 is a perspective view of the teeth 32, the coil 40 held by the teeth 32, and the rod-shaped pressing member 33. The teeth 32 are elongated substantially rectangular parallelepiped members made of soft magnetic material. Further, as shown in the cross section shown in FIG. 4, the teeth 32 include a rectangular portion 32c, a fitting slide portion 32a provided on the stator ring core 31 side of the rectangular portion 32c, and a fitting slide portion 32a provided on the rotor 60 side of the rectangular portion 32c. A locking portion 32b is provided.

The fitting slide portion 32a has a trapezoidal shape in which the upper base a is shorter than the short side b of the rectangular portion 32c and the lower base c is approximately equal in length to the short side b in the cross section shown in FIG. The fitting slide portion 32a has a shape in which the upper base a side faces the one short side c side of the rectangular portion 32c and is in contact with the rectangular portion 32c. The fitting slide portion 32a is slidably fitted into the fitting groove 31a of the stator ring core 31.

The locking portion 32b has a trapezoidal shape in which the length of the upper base d is approximately equal to the short side b of the rectangular portion 32c, and the lower base e is longer than the short side b of the rectangular portion 32c. The locking portion 32b has a shape in which the upper base d side faces the other short side b side of the rectangular portion 32c and is in contact with the rectangular portion 32c.
The locking portion 32b is a portion that locks the rod-shaped presser member 33. Note that the lower base e of the locking portion 32b is not straight in the cross section of FIG. 4, but is slightly curved so that the center portion is depressed.

When the fitting slide portions 32a of the plurality of teeth 32 are respectively inserted into the plurality of fitting grooves 31a of the stator ring core 31, the plurality of teeth 32 protrude from the inner surface of the stator ring core 31 toward the inner diameter side. Become.

[Coil 40]
The number of coils 40 is arranged in multiples of three so as to generate three-phase currents. FIG. 6 is a perspective view of the coil 40. The coil 40 is a so-called concentrated winding coil 40 in which a flat conductor is spirally wound around one tooth 32.

[Material of coil 40]
The electrical conductivity of the coil 40 varies continuously or intermittently depending on the position within the coil 40. Specifically, the electrical conductivity of the coil 40 varies continuously or intermittently in the spirally extending direction. More specifically, the coil 40 includes a winding part 41 and a pull-out part 42 extending from both ends of the winding part 41, and in the winding part 41, the rotor 60 side is opposite to the rotor 60 side. Its electrical conductivity is lower than that of
More specifically, the winding portion 41 of the coil 40 includes a first portion 41A made of a first conductor and disposed on the rotor 60 side, which is the upper side in FIGS. A second portion 41B made of a second conductor having higher electrical conductivity than the first conductor is disposed on the lower stator ring core 31 side.
That is, the winding portion 41 is wound continuously or intermittently from the rotor 60 side, where the magnetic flux generated by the magnets 65 of the rotor 60 has a large change, to the stator ring core 31 side, which is away from the stator 60, where the magnetic flux has a small change. Therefore, it is formed to have high electrical conductivity.

In the embodiment, the first conductor is manufactured from a metal whose main component is aluminum (Al). The second conductor is manufactured from a metal that has higher electrical conductivity (lower resistance) than the first conductor, and in the embodiment, is manufactured from a metal whose main component is copper. Further, in the embodiment, the lead-out portion 42 is made of the second conductor.

A metal whose main component is aluminum is a metal that contains 50% or more of pure aluminum or aluminum alloy, and if it contains other components different from pure aluminum or aluminum alloy, the type and number of other components may vary. Optional. Alternatively, the metal may contain 100% (or approximately 100%) of pure aluminum or aluminum alloy.

In addition, a metal whose main component is copper is a metal that contains 50% or more of pure copper or copper alloy, and if it contains other components different from pure copper or copper alloy, the type and number of other components can be determined arbitrarily. It is. Alternatively, the metal may have a pure copper or copper alloy content of 100% (or approximately 100%).

[Shape of coil 40]
The coil 40 includes a plurality of single-layer coils 40A that surround the substantially rectangular outer periphery of the teeth 32.
Each single-layer coil 40A has a pair of first extension portions 43 arranged along a pair of mutually opposing first sides on the outer periphery of the teeth 32, and a pair of first extending portions 43 that are arranged on the outer periphery of the teeth 32 and opposite to each other, A set of second extension parts 44 are arranged along a set of second sides that are substantially perpendicular to the first sides, and a first extension part is arranged on the outside of the corner on the outer periphery of the teeth 32. 43 and a substantially rectangular parallelepiped connecting corner portion 45 that connects the second extending portion 44 . The width of the first extending portion 43, the width of the second extending portion 44, and the lengths of two sides of the substantially rectangular parallelepiped connecting corner portion 45 are substantially equal. The first extending portion 43 and the second extending portion 44 are connected by a connecting corner portion 45 having a substantially rectangular parallelepiped shape.

The single-layer coil 40A has a rectangular ring shape that surrounds a rectangular opening 46 through which the teeth 32 are inserted, and the inner and outer contours are each substantially rectangular. In other words, the corners of the single-layer coil 40A are approximately at right angles. Furthermore, the thickness of the connecting corner portion 45 on the inner circumferential side and the outer circumferential side is substantially constant.

In the single-layer coil 40A, the 11-layer single-layer coil 40B on the stator ring core 31 side, which is the lower middle side in FIGS. The nine-layer single-layer coil 40A on the rotor 60 side, which is the middle upper side, is made of a metal whose main component is aluminum, which is the first conductor.

[Insulating resin film]
Further, an insulating resin film made of polyimide, for example, is uniformly and continuously provided on the winding portion 41 of the coil 40 from one end side to the other end side.

[Drawer section 42]
The pull-out portions 42 are portions that extend outward from both ends of the winding portion 41, and both similarly extend toward the front, that is, the bus bar 20 side. Since the pull-out portion 42 is pulled out forward in all of the plurality of coils 40, joining to the bus bar 20 is facilitated.

[Method for manufacturing coil 40]
FIG. 7 is a diagram showing an example of a method for manufacturing the coil 40. As shown in FIG. 7(A), first, two U-shaped members 40a and 40b punched out of a plate member, for example, are prepared as raw materials for one single-layer coil 40A. However, the shape of the material is not limited to the U-shape, and may be other shapes. Then, for example, the central portion 40c of one of the U-shaped members 40a is bent such that one side in the length direction is shifted from the other by one layer in the stacking direction in which the single-layer coils 40A are stacked.

Next, as shown in FIG. 7(B), one end surface 40e of the two U-shaped members 40a and one end surface 40e of the U-shaped member 40b are butted together and joined by, for example, cold pressure welding, and then the two U-shaped members 40a and one end surface 40e of the U-shaped member 40b are joined. A layered coil 40A is manufactured. At this time, the other end surface 40d does not contact and is not connected because the center portion 40c of the U-shaped member 40a is bent so as to be shifted by one layer in the stacking direction.
Next, the plurality of single-layer coils 40A manufactured in this manner are joined by, for example, cold pressure welding, with the end surfaces 40d of the vertically stacked single-layer coils 40A abutted against each other. Thereby, a plurality of single-layer coils 40A are connected in a spiral manner.

Next, the coil 40 is immersed in a solution containing an insulating resin, for example, and coated with the insulating resin by, for example, electrodeposition. Note that the coating with the insulating resin is not limited to immersion, and may be applied by spraying a liquid insulating resin onto the coil 40 or the like. The coil 40 is manufactured as described above.

[Rod-shaped presser member 33]
Returning to FIG. 4, as described above, the locking portion 32b is provided at the end of the tooth 32 on the stator 30 side, the width of which gradually becomes wider than the rectangular portion 32c of the tooth 32 around which the coil 40 is wound. It is being Therefore, the distance between the locking portions 32b of the teeth 32 and the adjacent teeth 32 gradually narrows toward the end on the rotor 60 side (inner diameter side). In the embodiment, a rod-shaped pressing member 33 is arranged closer to the stator ring core 31 (on the outer diameter side) than the tip of the locking portion 32b where the distance between the adjacent teeth 32 is the narrowest.

The rod-shaped holding member 33 has a cylindrical shape and a diameter larger than the narrowest distance between adjacent locking portions 32b, that is, the distance between the end portions of the locking portions 32b on the rotor 60 side. The narrowest distance between the portions 32c is smaller than the distance between the ends of the rectangular portions 32c on the rotor 60 side. Further, the length of the rod-shaped pressing member 33 is approximately equal to the length of the teeth 32.

The circumferential surface of the rod-shaped presser member 33 is in contact with the outer surface of each locking portion 32b of the teeth 32 adjacent to each other. Further, the circumferential surface of the rod-shaped presser member 33 comes into contact with an end surface 40Aa of the coil 40 on the rotor 60 side (inner diameter side) to prevent the coil 40 from moving toward the rotor 60 side (inner diameter side). That is, as shown in FIG. 4, the rod-shaped holding member 33 holds the end surface 40Aa of the coil 40 on the rotor 60 side so as to be farther away from the rotor 60 than the end surface e of the teeth 32 on the rotor 60 side. There is. This reduces the generation of eddy currents and improves the power generation efficiency of the generator 1.

Although the rod-shaped presser member 33 is made of resin in the embodiment, it may be made of, for example, graphite whose surface is insulated, so as to have a heat dissipation mechanism for dissipating the heat generated by the coil 40.

[Busbar 20]
As shown in FIG. 2, the bus bar 20 is disposed in front of the stator 30 along the circumference of the stator 30, is connected to the lead-out portion 42 of the coil 40, is also connected to an external structure (not shown), and is connected to the coil 40. The power generated by 40 is output to the outside.

[Rotor 60]
A rotor 60 is arranged on the inner diameter side of the stator 30. The rotor 60 includes a shaft 61 and a core member 62 attached to the shaft 61.

[Shaft 61]
The shaft 61 extends along the axis A and is press-fitted into a through hole 64 provided at the center of the core member 62 . The front side of the shaft 61 is rotatably inserted into the shaft hole 11 of the front lid 10, and the rear end of the shaft 61 is rotatably held in the holding hole 81 of the rear lid 12 of the housing 50.

[Core member 62]
The core member 62 is fixed to the outer periphery of the shaft 61 and rotates together with the shaft 61. Core member 62 is manufactured from a soft magnetic material. The core member 62 is divided in the direction along the axis A into a first core member 62A, a second core member 62B, and a third core member 62C.

[Skew angle]
The first core member 62A, the second core member 62B, and the third core member 62C have substantially the same structure, but are arranged to be shifted by a predetermined skew angle θ in the circumferential direction. FIG. 8 is a diagram illustrating the skew angle θ between the first core member 62A, the second core member 62B, and the third core member 62C. 3 is a view of a portion of the core member 62C viewed from the front side of the axis A. FIG. In the embodiment, the skew angle θ is 5/3 deg (≈1.667 deg), but is not limited to this, and can be appropriately set depending on the shape, number, etc. of the magnets 65 arranged inside.

[Shape of core member 62]
As shown in FIGS. 2, 4, and 8, on the outer circumferential surface of each core member 62, there is a protrusion 63 extending along the axis A direction and protruding in a substantially arc shape in a cross section perpendicular to the axis A. A plurality of them are provided at equal intervals in the circumferential direction. The protruding shape of the protrusion portion 63 is provided so that the change in magnetic flux due to the magnet 65 held inside becomes close to a sine wave.

[Magnet 65]
A magnet 65 is embedded in the inner diameter side of the protruding portion 63 of the core member 62 . A total of four magnets 65, two in the circumferential direction and two in the axis A direction, are embedded in one protrusion 63. The magnets 65 are each permanent magnets and have substantially the same shape.

Further, the shortest distance x of the air gap shown in FIG. 4 between the core member 62 and the protruding strip 63 is about 1 mm in the embodiment. Due to the existence of this narrow shortest distance x, the magnetic resistance between the stator 30 and the rotor 60 can be reduced, and the magnetic flux transmitted to the stator 30 can be increased. Thereby, the performance of the generator 1 can be improved.

[Operation of generator 1]
In the generator 1 having the above structure, when the rotor 60 rotates, the magnetic field formed by the magnets 65 changes. Then, an induced electromotive force is generated in the coil 40 of the stator 30 due to electromagnetic induction. The electric power induced in the coil 40 is output to the outside via the bus bar 20.

[Effect of generator 1]
The generator 1 of the embodiment has a substantially rectangular outer circumference of the teeth 32 around which the coil 40 is wound, and includes a plurality of single-layer coils 40A that surround the outer circumference of the teeth 32. A set of first extension portions 43 disposed along a pair of first sides facing each other on the outer periphery, and a set of first extension portions 43 arranged along a set of first sides facing each other on the outer periphery of the teeth 32, and a set of first extension portions 43 facing each other and arranged in a direction substantially perpendicular to the first sides on the outer periphery of the teeth 32. a pair of second extending portions 44 arranged along the second side of the second extending portion 44; and a substantially rectangular connecting corner portion 45 connecting the first extending portion 43 and the second extending portion 44; The inner and outer circumferences of the single-layer coil 40A are approximately rectangular.
That is, according to the generator 1 of the embodiment, the corner portions (both the outer circumferential side and the inner circumferential side) of the single-layer coil 40A and the entire coil 40 in which a plurality of single-layer coils 40A are laminated are approximately It becomes a right angle. The angles of the teeth 32 are also approximately right angles. Therefore, according to the generator 1 of the embodiment, the teeth 32 can be arranged inside the rectangular opening of the coil 40 without any gap or with a small gap.

[Power generation efficiency]
If the gap between the teeth 32 and the coil 40 is large, the occupancy of the winding portion of the coil will be large, resulting in poor power generation efficiency. However, according to the generator 1 of the embodiment, since the teeth 32 have a rectangular shape, they can be placed inside the rectangular opening of the coil 40 without any gaps or with small gaps, so that the coil occupation rate becomes large. , high efficiency can be achieved as the generator 1.

[Heat dissipation]
The heat generated by the coil 40 is transmitted to the housing 50 via the teeth 32 and is radiated to the outside. If the gap between the teeth 32 and the coil 40 is large, the heat generated in the coil 40 will be difficult to transfer to the housing 50, resulting in poor heat dissipation. However, in the embodiment, there is no gap between the teeth 32 and the coil 40, or the gap is small, so that the heat dissipation of the generator 1 is improved.

[Occupancy factor]
For example, in the case of a round wire coil, the space factor when wound around the teeth 32 is 50%, and in the case of a square wire coil, the space factor is 55%. However, in the coil 40 of the embodiment, since the corners (both the outer circumferential side and the inner circumferential side) are substantially right angles, it is possible to realize a space factor of 90% or more. Therefore, the generator 1 can be made smaller.
Furthermore, by improving heat dissipation by increasing the space factor, the peak output of the generator 1 can be maintained for a longer period of time than existing generators.

[responsiveness]
Since the coil 40 is a laminate of flat single-layer coils 40A, it has a larger cross-sectional area in a direction perpendicular to the direction in which the coil 40 extends than, for example, a round wire coil. Therefore, compared to the case where a round wire coil is used, a larger current can be passed through the coil 40, and the responsiveness of the generator 1 is improved, the output density is improved, and high output is possible.

[Recycling efficiency]
The coil 40 of the generator 1 can be recycled at the time of disposal, but in this case it is necessary to remove the coating from the metal part of the coil 40. In the case of round wire coils, recycling efficiency is low due to unnecessary waste during recycling and the large amount of insulation coating per metal material of the coil.
However, the coil 40 of the embodiment is a laminate of flat single-layer coils 40A. Therefore, the surface area of the coil 40 is less than half that of a round wire coil, and the amount of coating per unit volume is small. Therefore, more than 90% of the metal material from the coil 40 can be recycled.

[Environment/Inexpensive]
In the single-layer coil 40A, the 11-layer single-layer coil 40A on the stator ring core 31 side is made of a metal whose main component is copper, which is the second conductor, and the 9-layer single-layer coil 40A on the rotor 60 side is made of a metal whose main component is copper. , the first conductor is made of a metal whose main component is aluminum.
Aluminum has a lower melting point and produces much lower _CO2 emissions than copper when recycled. Therefore, the coil 40 of the embodiment is environmentally friendly because it emits less CO ₂ during recycling than when the entire coil is made of copper. Furthermore, since aluminum resources are more abundant than copper, there is less concern about depletion and they can be manufactured at low cost.

[Weight saving]
In the single-layer coil 40A, the 11-layer single-layer coil 40A on the stator ring core 31 side is made of a metal whose main component is copper, which is the second conductor, and the 9-layer single-layer coil 40A on the rotor 60 side is made of a metal whose main component is copper. , the first conductor is made of a metal whose main component is aluminum. Therefore, the weight can be reduced compared to the case where the entire coil 40A is manufactured from a metal whose main component is copper, which is the second conductor.

[Easy to assemble]
Since the pull-out portions 42 of the coils 40 are pulled out to the front side where the bus bar 20 is arranged in all of the plurality of coils 40, joining with the bus bar 20 becomes easy.

[resistance]
In the manufacturing process of the coil 40, cold pressure welding is used. According to cold pressure welding, it is possible to crush the oxide film or the like formed on the joint surface into sufficiently fine fragments, and to disperse the fragments at wide intervals at the joint interface. This allows interatomic bonding between the bonding surfaces without substantially intervening an oxide film or the like at the bonding interface, and almost no increase in contact resistance at the bonding portion is observed. Therefore, since the resistance of the coil 40 is small, the resistance becomes small, and the generator 1 can achieve high efficiency.

[Effect of rod-shaped presser member 33]
As shown in FIG. 4, the rod-shaped holding member 33 holds the end face of the coil 40 on the rotor 60 side so that it is spaced further from the rotor 60 than the end face 32d of the teeth 32 on the rotor 60 side. are doing. This prevents eddy currents and improves power generation efficiency.

[Effect of the shape of the core member 62]
On the outer circumferential surface of each core member 62, a plurality of protrusions 63 are provided at equal intervals in the circumferential direction, extending along the axis A direction and protruding in a substantially arc shape in a cross section perpendicular to the axis A. There is. Due to the protruding shape of the protruding portion 63, the change in magnetic flux caused by the magnet 65 held inside becomes close to a sine wave. Therefore, high efficiency can be achieved as the generator 1.

[Effect of skew structure]
Since the first core member 62A, the second core member 62B, and the third core member 62C are deviated by a skew angle θ in the circumferential direction, the magnetic poles of the magnets 65 attached to each core member 62 are shifted in the direction of the axis A. A step skew structure is formed.
In the generator 1 using the magnet 65, when the rotor 60 rotates, an attractive force acts between the magnet 65 and the coil 40, and cogging torque is generated. In order to achieve smooth rotation with low noise and low vibration, it is effective to reduce cogging torque. In the embodiment, cogging torque can be reduced by using such a step skew structure.

[Wind power generator 100]
The generator 1 having the above structure can be used, for example, for wind power generation. FIG. 9 is a schematic diagram of a wind power generation device 100 using the generator 1 of the embodiment. Wind power generation device 100 includes blades 110, nacelle 120, tower 130, and foundation 140. The wind power generation device 100 has a rated output of, for example, about 300 kW, although it is not limited thereto.

The blades 110 are parts that rotate when receiving wind, and three blades are provided in the embodiment. Although not limited thereto, the rotating diameter of the blade 110 in the embodiment is approximately 330 cm.
Nacelle 120 is a mechanical room mounted on top of tower 130. A blade 110 is attached to the tip of the nacelle 120. Inside the nacelle 120, a main shaft 121, a speed increaser 122, the generator 1 of this embodiment, etc. are housed. The main shaft 121 is the shaft rotated by the blade 110. The speed increaser 122 speeds up the low-speed, high-torque input transmitted from the blades 110 to the main shaft 121 and transmits it to the generator 1 . The tower 130 is a support that supports the wind power generation device 100. The foundation 140 is a part that fixes the tower 130 to the ground.

When the generator 1 of the embodiment is used in such a wind power generator 100, since the generator 1 of the embodiment is small and lightweight as described above, the nacelle 120 portion of the wind power generator 100 can be made smaller and lighter. This makes it possible to reduce installation costs, maintenance costs, etc.

θ Skew angle A Axis 1 Generator 20 Bus bar 30 Stator 31 Stator ring core 31a Fitting groove 32 Teeth 32a Fitting slide part 32b Locking part 32c Rectangular part 32d End face 33 Rod-shaped holding member 40 Coil 40A Single layer coil 41 Winding wire Part 41A First part 41B Second part 42 Drawer part 43 First extension part 44 Second extension part 45 Connection corner part 46 Opening part 50 Housing 51 Storage space 60 Rotor 61 Shaft 62 Core member 62A First core member 62B Second core member 62C Third core member 63 Projection portion 64 Through hole 65 Magnet 100 Wind power generator 110 Blade 120 Nacelle 121 Main shaft 122 Speed increaser 130 Tower 140 Foundation

Claims (12)

a rotor that holds a plurality of magnets arranged in a circumferential direction around an axis and is rotatable around the axis;
A fixing device having a plurality of teeth arranged at a predetermined distance in a radial direction from the rotor and arranged in a circumferential direction around the axis, and a coil wound helically around the teeth. A generator comprising:
The coil has electrical conductivity that varies continuously or intermittently depending on the position within the coil. The electrical conductivity of the coil varies continuously or intermittently in the direction in which it extends spirally,
The generator according to claim 1. The coil is
a winding portion spirally wound around the teeth;
A pull-out portion extending from both ends of the winding portion,
In the winding part,
The electrical conductivity on the rotor side is lower than the electrical conductivity on the opposite side to the rotor side.
The generator according to claim 1. The coil is
a winding portion spirally wound around the teeth;
A pull-out portion extending from both ends of the winding portion,
The winding portion is
a first portion made of a first conductor and arranged on the rotor side;
a second portion disposed on a side opposite to the rotor side and made of a second conductor having higher electrical conductivity than the first conductor;
The generator according to claim 1. The drawer portion is made of the first conductor.
The generator according to claim 4. The outer periphery of the teeth around which the coil is wound is approximately rectangular,
The coil includes a plurality of single-layer coils surrounding the outer periphery of the teeth,
The single layer coil is
a set of first extension portions disposed along a set of mutually opposing first sides on the outer periphery of the teeth;
a set of second extending portions disposed along a set of second sides on the outer periphery of the teeth, facing each other and extending in a direction substantially orthogonal to the first side;
a substantially rectangular connection corner that connects the first extension part and the second extension part,
The inner circumference and outer circumference of the single-layer coil are approximately rectangular;
The generator according to claim 1. The connecting corner portion has a substantially constant thickness;
The generator according to claim 6. the coil is coated with polyimide;
The generator according to claim 1.
comprising a rod-shaped pressing member disposed between the end of the coil closest to the rotor and the end of the tooth closest to the rotor;
The generator according to claim 1. The rotor is
Equipped with a core member that holds a magnet,
The core member is divided in a direction along the axis,
The generator according to claim 1. A plurality of protrusions extending along the axis and protruding in an arc shape in a cross section orthogonal to the axis are provided on the outer peripheral surface of the core member at equal intervals.
The generator according to claim 10. A wind power generation device comprising the generator according to any one of claims 1 to 11.

Images