JP2012152092A - Rotary electric machine and wind power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which improves the durability of a rotor and enables rotor assembly to be conducted with a simple method.SOLUTION: An electric generator 1 (rotary electric machine) includes: a rotor 20 including a shaft 21, a rotor yoke 23 enclosing the shaft 21, and a rotor core 24 (rotor cores 24a and 24b) disposed on an outer peripheral surface of the rotor yoke 23 and having multiple permanent magnets 30 (31) embedded thereon in a circumferential manner so as to be spaced away from each other; and a stator 10 disposed so as to face an outer peripheral surface of the rotor 20. The rotor yoke 23 is fastened to an inner peripheral part of the rotor core 24 with nuts 41 and bolts 42.

Description

  The present invention relates to a rotating electrical machine and a wind power generation system, and more particularly, to a rotating electrical machine and a wind power generation system including a rotor including a rotor core in which a plurality of permanent magnets are embedded in a circumferential manner at intervals.

  2. Description of the Related Art Conventionally, a rotating electrical machine including a rotor including a rotor core in which a plurality of permanent magnets are embedded in a circumferential manner with a gap is known (see, for example, Patent Document 1).

  Patent Document 1 discloses an IPM motor (rotary electric machine) including a rotor including an iron core (rotor core) in which a plurality of rare earth magnets (permanent magnets) are embedded circumferentially at intervals. In assembling the rotor of this IPM motor, the rotating shaft is fixed to the iron core by shrink-fitting the rotating shaft to the inner periphery of the iron core.

JP 2000-324738 A

  However, in the IPM motor disclosed in Patent Document 1, since the iron core and the rotating shaft are shrink-fitted at the time of assembling the rotor, the residual stress (shrink-fitting stress) due to the heat of shrink-fitting on the rotor after assembling. There is a disadvantage that occurs. As described above, when shrink fitting is performed at the time of assembling the rotor, there is a problem that the durability of the rotor is reduced due to the occurrence of the rotor residual stress. In addition, when shrink fitting is performed at the time of assembling the rotor, there is a problem that heating equipment for shrink fitting is necessary.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to increase the durability of the rotor and to assemble the rotor by a simple method. It is to provide a rotating electrical machine.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, a rotating electrical machine according to a first aspect of the present invention includes a rotating shaft portion, a rotor yoke that surrounds the rotating shaft portion, and an outer peripheral surface of the rotor yoke, and a plurality of permanent magnets spaced from each other. A rotor including a rotor core embedded in a circumferential shape, and a stator disposed so as to face the outer peripheral surface of the rotor. The rotor core includes a plurality of first magnetic pole portions having permanent magnets, and a permanent magnet. A plurality of second magnetic pole portions that are not arranged one by one alternately in a circumferential shape, and the inner periphery of the rotor yoke and the rotor core is formed by a fastening member that is disposed at a portion corresponding to the second magnetic pole portion of the rotor core. The part is concluded.

  In the rotating electrical machine according to the first aspect of the present invention, the rotor yoke and the inner peripheral portion of the rotor core are fastened by the fastening member as described above. As a result, unlike the case where the rotor core and the rotor yoke are fixed by shrink fitting when the rotor is assembled, residual stress due to the heat of shrink fitting does not occur in the assembled rotor. Can be increased. Moreover, since heating equipment for performing shrink fitting is not necessary, the rotor can be assembled by a simple method.

  A wind power generation system according to a second aspect of the present invention includes a generator including a rotor, a stator disposed so as to face the outer peripheral surface of the rotor, and a blade connected to a rotating shaft portion of the rotor of the generator. The rotor includes: a rotating shaft portion; a rotor yoke surrounding the rotating shaft portion; and a rotor core disposed on the outer peripheral surface of the rotor yoke and embedded with a plurality of permanent magnets circumferentially at intervals. A plurality of first magnetic pole portions having permanent magnets and a plurality of second magnetic pole portions not having permanent magnets are alternately arranged circumferentially one by one, corresponding to the second magnetic pole portion of the rotor core The rotor yoke and the inner peripheral portion of the rotor core are fastened by a fastening member disposed at the portion to be engaged.

  In the wind power generation system according to the second aspect of the present invention, as described above, the rotor yoke of the generator rotor and the inner peripheral portion of the rotor core are fastened by the fastening member. As a result, unlike the case where the rotor core and the rotor yoke are fixed by shrink fitting when the rotor is assembled, residual stress due to the heat of shrink fitting does not occur in the assembled rotor. Can be increased. Moreover, since heating equipment for performing shrink fitting is not necessary, the rotor can be assembled by a simple method. Here, since a wind power generation system is generally used for a long period of time, high durability is required. In general, a rotor used for a generator of a wind power generation system is difficult to assemble because of its large size. In this case, according to the present invention, the durability of the rotor can be improved and the rotor can be assembled by a simple method, so that a generator suitable for a wind power generation system can be provided.

It is a schematic diagram which shows the structure of the wind power generation system by one Embodiment of this invention. It is the figure which looked at the stator and rotor of the generator by one Embodiment of this invention from the A direction side of FIG. FIG. 3 is an enlarged view of FIG. 2. It is the enlarged view which looked at FIG. 3 from the B direction side of FIG. FIG. 5 is a cross-sectional view taken along line 50-50 in FIGS. 3 and 4. FIG. 5 is a cross-sectional view taken along line 150-150 in FIGS. 3 and 4. It is a figure which shows the core part which comprises the rotor core of the generator by one Embodiment of this invention. It is a perspective view which shows the nut member used when attaching the rotor core of the generator by one Embodiment of this invention to a rotor yoke. It is sectional drawing for demonstrating the procedure which fastens the rotor core and rotor yoke of the generator by one Embodiment of this invention. It is sectional drawing for demonstrating the procedure which fixes the rotor core and rotor yoke of the generator by one Embodiment of this invention with a key member. It is a schematic diagram which shows the structure of the wind power generation system by the modification of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIG. 1, the structure of the wind power generation system 100 containing the generator 1 by one Embodiment of this invention is demonstrated. The generator 1 is an example of the “rotary electric machine” in the present invention.

  As shown in FIG. 1, the wind power generation system 100 includes a generator 1, a nacelle 2, a rotor hub 3, blades 4, and a tower (support column) 5. The generator 1 is housed inside the nacelle 2. The rotor hub 3 is connected to a shaft 21 (described later) of the generator 1. A plurality of blades 4 are attached to the rotor hub 3. The nacelle 2 is attached to the tower 5.

  Next, with reference to FIGS. 2-8, the structure of the generator 1 by one Embodiment of this invention is demonstrated.

  As shown in FIG. 2, the generator 1 includes a stator 10 and a rotor 20. The stator 10 is disposed with a predetermined space (gap) therebetween so as to face the outer peripheral surface of the rotor 20. The stator 10 has a cylindrical shape surrounding the rotor 20. The stator 10 includes a stator core 11 formed with a plurality of slots 11a and a winding 12. The plurality of slots 11 a are arranged at substantially equal angular intervals along the inner periphery of the stator core 11. The winding 12 is wound between the slots 11a by concentrated winding or distributed winding.

  As shown in FIG. 2, the rotor 20 includes a shaft 21, a rotor wheel 22, a rotor yoke 23, and a rotor core 24. The shaft 20 is an example of the “rotating shaft” in the present invention. The rotor wheel 22 is an example of the “support member” in the present invention.

  The shaft 21 is inserted into a shaft insertion hole 22a provided in the vicinity of the center portion of the rotor wheel 22, thereby extending through the center of the rotor 20 in the X direction (see FIG. 1) (hereinafter referred to as the axial direction). It is provided as follows. The rotor wheel 22 surrounds the shaft 21 and is formed in a disk shape that contacts the inner peripheral surface of the rotor yoke 23. The rotor wheel 22 is provided with a plurality of openings 22b penetrating in the axial direction. The rotor yoke 23 is formed in a cylindrical shape that surrounds the shaft 21 and has an inner peripheral surface that is in contact with the outer peripheral portion of the disk-shaped rotor wheel 22. As shown in FIGS. 5 and 6, the axial length L of the cylindrical rotor yoke 23 is configured to be larger than the thickness t of the disk-shaped rotor wheel 22.

  The rotor core 24 has a cylindrical shape having an inner peripheral surface disposed on the outer peripheral surface of the rotor yoke 23. Moreover, the rotor core 24 is comprised by the some electromagnetic steel plate laminated | stacked so that it might overlap in an axial direction, as shown in FIG.5 and FIG.6. In the present embodiment, the rotor core 24 is divided into two at the central portion in the axial direction. That is, the rotor core 24 includes a rotor core 24a (rotor core 24 on the A direction (see FIG. 1) side) and a rotor core 24b (rotor core 24 on the B direction (see FIG. 1) side) arranged so as to overlap in the axial direction. Has been.

  As shown in FIGS. 2 to 4, a plurality of permanent magnets 30 and 31 are embedded in the rotor cores 24 a and 24 b in a circumferential manner at intervals along the rotational direction (hereinafter referred to as the circumferential direction). Yes. Specifically, as shown in FIGS. 2 and 3, the rotor core 24 a includes a first magnetic pole portion 241 a having a permanent magnet 30 and a second magnetic pole portion 242 a not having the permanent magnet 30 alternately. It is configured by being arranged in a circumferential shape. Similarly, as shown in FIG. 4, in the rotor core 24 b, the first magnetic pole portion 241 b having the permanent magnet 31 and the second magnetic pole portion 242 b not having the permanent magnet 31 are alternately arranged circumferentially one by one. It is constituted by.

  As will be described later, the plurality of permanent magnets 30 are magnetized so that the radial magnetization directions are the same. The plurality of permanent magnets 31 are both magnetized so that the magnetization direction in the radial direction is the same (the magnetization direction opposite to the permanent magnet 30). In general, the structure of the rotor core 24a (24b) in which a plurality of permanent magnets 30 (31) are arranged in a circumferential shape so that the radial magnetization directions are the same is called a contiguous pole structure. .

  Here, in the present embodiment, as shown in FIGS. 3 and 4, the first magnetic pole portion 241 a (241 b) exposes the magnet covering portion 243 that covers the outer peripheral side of the permanent magnet 30 and both end faces of the permanent magnet 30. And two connecting portions 245 provided to correspond to the two gaps 244, respectively.

  The surface on the outer peripheral side of the magnet covering portion 243 is formed so as to have a convex shape with the portion corresponding to the central portion of the permanent magnet 30 as the top when viewed from the axial direction. In addition, a corner portion 244a on the second magnetic pole portion 242 side of a portion corresponding to the connecting portion 245 of the gap 244 is formed to have an arcuate cross-sectional shape. The connecting portion 245 connects the magnet covering portion 243 and the two second magnetic pole portion 242a (242b) adjacent to the first magnetic pole portion 241a (241b) along the outer periphery of the rotor core 24a (24b). It is formed in a thin shape. Note that, in the present embodiment, the radial thickness t1 of the connecting portion 245 is configured to be smaller than the radial thickness t2 of the magnet covering portion 243. For example, the radial thickness t1 of the connecting portion 245 is about 1 mm or more and about 1.5 mm or less, and the radial thickness t2 of the central portion of the magnet covering portion 243 is about 3 mm or more and about 4 mm or less.

  In the present embodiment, as shown in FIGS. 3 and 4, a hole 246 a for attaching the permanent magnet 30 (31) to the first magnetic pole portion 241 a (241 b) so as to be continuous with the gap 244. (264b) is provided. The hole 246a (264b) is provided with a pair of engaging portions 247 that engage with an inclined portion 30a (31a), which will be described later, of the permanent magnet 30 (31). The circumferential width between the pair of engaging portions 247 is configured to gradually decrease from the inner peripheral side to the outer peripheral side of the rotor core 24a (24b). Here, the permanent magnet 30 (31) is formed to have a substantially trapezoidal cross section. Specifically, the circumferential width of the permanent magnet 30 (31) gradually decreases from the inner peripheral side to the outer peripheral side of the rotor core 24a (24b) on both side end surfaces of the permanent magnet 30 (31). Is provided with an inclined portion 30a (31a).

  In the present embodiment, the rotor cores 24a and 24b are arranged so as to overlap in the axial direction in a state of being shifted by a predetermined angle (180 ° in electrical angle) in the rotational direction. That is, as shown in FIGS. 5 and 6, the rotor cores 24a and 24b correspond to the first magnetic pole portion 241a of the rotor core 24a and the second magnetic pole portion 242b of the rotor core 24b, and the second magnetic pole portion 242a of the rotor core 24a. It arrange | positions so that the 1st magnetic pole part 241b of the rotor core 24b may correspond. Note that the axial lengths of the rotor cores 24 a and 24 b are each half (L / 2) of the axial length L of the rotor yoke 23.

  In the present embodiment, the permanent magnet 30 embedded in the first magnetic pole portion 241a of the rotor core 24a and the permanent magnet 31 embedded in the first magnetic pole portion 241b of the rotor core 24b have different polarities on the outer peripheral side. Magnetized. Specifically, the permanent magnet 30 is magnetized to have an N pole on the outer peripheral side of the rotor core 24a, and the permanent magnet 31 is magnetized to have an S pole on the outer peripheral side of the rotor core 24b. .

  In the present embodiment, as shown in FIGS. 2 to 4, the rotor core 24 a (24 b) is configured to be divided in the circumferential direction so as to include a plurality of core portions 25. Each of the plurality of core portions 25 is configured to include three first magnetic pole portions 241a (241b) adjacent along the outer periphery of the core portion 25. The plurality of core portions 25 are formed so as to have substantially the same shape obtained by dividing the cylindrical rotor core 24a (24b) at substantially equal angular intervals. Specifically, each of the plurality of core portions 25 is formed to have a substantially arc shape when viewed from the axial direction.

  In the present embodiment, as shown in FIGS. 2 to 6, the inner peripheral portion of the rotor core 24 a (24 b) and the rotor yoke 23 are fastened by a nut 41 and a bolt 42 that is screwed to the nut 41. . The nut 41 and the bolt 42 are disposed in a portion corresponding to the second magnetic pole portion 242a (242b) of the inner peripheral portion of the rotor core 24a (24b), and the plurality of core portions 25 constituting the rotor core 24a (24b). Located at the boundary. The nut 41 and the bolt 42 are examples of the “fastening member” in the present invention.

  As shown in FIGS. 5 and 6, the nut 41 is inserted into a nut insertion hole 25a (described later) in the inner peripheral portion of the rotor core 24a (24b), and is arranged so as to extend in the axial direction toward the rotor core 24a (24b). Yes. The nut 41 is formed in a rectangular parallelepiped shape (see FIG. 8) having a length L / 2. The nut 41 is provided with a plurality (two in the present embodiment) of screw holes 41a each having an internal thread formed on the inner surface along the direction in which the nut 41 extends (axial direction). The bolt 42 is inserted into a bolt insertion hole 23a described later on the inner peripheral surface of the rotor yoke 23, and is screwed into the screw hole 41a of the nut 41 via a groove portion 25b described later of the core portion 25 constituting the rotor core 24a (24b). Configured to match. The screw hole 41a is an example of the “screwed portion” in the present invention.

  As shown in FIGS. 3, 4, and 7, a plurality of nut insertion holes 25 a are provided in the inner peripheral portion of the core portion 25 that constitutes the rotor core 24 a (24 b). Each of the plurality of nut insertion holes 25a is formed in a rectangular shape having substantially the same size as the nut 41 when viewed from the axial direction. A plurality of groove portions 25b are provided so as to correspond to each of the plurality of nut insertion holes 25a. Each of the plurality of groove portions 25b is formed in a groove shape that connects the nut insertion hole 25a and the inner peripheral surface of the core portion 25 of the rotor core 24a (24b). In the present embodiment, the groove width W1 of the groove portion 25b is configured to be smaller than the hole width W2 of the nut insertion hole 25a. Further, the plurality of nut insertion holes 25a and the groove portions 25b are arranged at substantially equal angular intervals along the circumferential direction of the rotor core 24a (24b). Moreover, as shown in FIGS. 5 and 6, the plurality of nut insertion holes 25a and the groove portions 25b are provided so as to extend along the axial direction.

  As shown in FIGS. 5 and 6, the bolt insertion hole 23 a has a portion protruding from the rotor wheel 22 on the inner peripheral surface of the cylindrical rotor yoke 23 (other than the portion where the rotor wheel 22 and the rotor yoke 23 are in contact with each other). Part) is provided so as to penetrate the inner peripheral surface and the outer peripheral surface of the rotor yoke 23. The bolt insertion holes 23a are plural (this embodiment) along the extending direction (axial direction) of the nut 41 so that the nut 41 and the bolt 42 can be screwed together with the nut 41 inserted into the nut insertion hole 25a. In the form, two) are provided.

  In the present embodiment, as shown in FIGS. 3, 4 and 6, the first key insertion groove 25c extending in the axial direction is formed on the inner peripheral surface of the core portion 25 constituting the rotor core 24a (24b). Has been. A second key insertion groove 23b is formed on the outer peripheral surface of the rotor yoke 23 so as to correspond to the first key insertion groove 25c. A key member 43 made of a parallel key or the like is inserted into the key insertion hole 60 made up of the first key insertion groove 25c and the second key insertion groove 23b. A plurality of key insertion holes 60 are arranged at substantially equal angular intervals (see FIG. 2) along the circumferential direction at a portion where the inner peripheral portion of the rotor core 24a (24b) and the outer peripheral portion of the rotor yoke 23 are in contact with each other. Specifically, the key insertion hole 60 is disposed in the vicinity of the central portion in the direction along the circumferential direction of the inner peripheral portion of the core portion 25 constituting the rotor core 24a (24b).

  Next, with reference to FIGS. 2-10, the assembly procedure of the rotor 20 of the generator 1 by one Embodiment of this invention is demonstrated.

  First, as shown in FIG. 2, the shaft 21 is inserted into the shaft insertion hole 22 a of the disc-shaped rotor wheel 22, and a cylindrical rotor yoke 23 is attached to the outer peripheral portion of the rotor wheel 22.

  Next, a rotor core 24 (rotor cores 24 a and 24 b) composed of a plurality of core portions 25 is attached on the outer peripheral surface of the rotor yoke 23. Specifically, a plurality of substantially arc-shaped core portions 25 are arranged in a circumferential shape on the outer peripheral surface of a cylindrical rotor yoke 23. Thus, two cylindrical rotor cores 24 a and 24 b having an inner peripheral surface in contact with the outer peripheral surface of the rotor yoke 23 are configured.

  At this time, the rotor cores 24a and 24b are configured such that the permanent magnet 30 embedded in the rotor core 24a and the permanent magnet 31 embedded in the rotor core 24b have different polarities on the outer peripheral side. Specifically, the rotor cores 24a and 24b are configured so that the polarity on the outer peripheral side of the permanent magnet 30 embedded in the rotor core 24a is the N pole and the polarity on the outer peripheral side of the permanent magnet 31 embedded in the rotor core 24b is the S pole. .

  At this time, the rotor cores 24a and 24b are arranged on the outer peripheral surface of the rotor yoke 23 so as to overlap each other in the axial direction in a state where the rotor core 24a and the rotor core 24b are shifted by a predetermined angle (180 ° in electrical angle) in the rotation direction. Specifically, the first magnetic pole part 241a of the rotor core 24a and the second magnetic pole part 242b of the rotor core 24b are made to correspond to each other, and the second magnetic pole part 242a of the rotor core 24a and the first magnetic pole part 241b of the rotor core 24b are made to correspond to each other. The rotor cores 24 a and 24 b are arranged on the outer peripheral surface of the rotor yoke 23.

  Next, the grooves 25b on the inner periphery of the core 25 constituting the rotor core 24a (24b) and the bolt insertion holes 23a penetrating the inner and outer peripheral surfaces of the rotor yoke 23 are aligned. Further, the first key insertion groove 25c on the inner peripheral portion of the core portion 25 of the rotor core 24a (24b) and the second key insertion groove 23b on the outer peripheral surface of the rotor yoke 23 are aligned.

  Next, as shown in FIG. 9, the inner peripheral portion of the rotor core 24 a (24 b) disposed on the outer peripheral surface of the rotor yoke 23 and the rotor yoke 23 are fastened by a nut 41 and a bolt 42. Specifically, first, a rectangular parallelepiped nut 41 (see FIG. 8) is axially inserted into the nut insertion hole 25a provided in the inner peripheral portion of the rotor core 24a (24b) so as to extend along the axial direction. insert. Then, the bolt 42 is inserted into the bolt insertion hole 23 a of the rotor yoke 23 from the inside of the rotor yoke 23. Then, the bolt 42 is screwed into the screw hole 41a of the nut 41 through the bolt insertion hole 23a of the rotor yoke 23 and the groove portion 25b of the core portion of the rotor core 24a (24b) aligned as described above.

  Finally, as shown in FIG. 10, with respect to the key insertion hole 60 composed of the first key insertion groove 25c of the rotor core 24a (24b) and the second key insertion groove 23b of the rotor yoke 23 aligned as described above, A key member 43 composed of a parallel key or the like is inserted in the axial direction. In this manner, the rotor 20 of the generator 1 according to the embodiment of the present invention is assembled.

  In the present embodiment, as described above, the rotor yoke 23 of the rotor 20 of the generator 1 and the inner peripheral portion of the rotor core 24 are fastened by the nut 41 and the bolt 42. Accordingly, when the rotor 20 is assembled, unlike the case where the rotor core 24 and the rotor yoke 23 are fixed by shrink fitting, residual stress due to heat of shrink fitting does not occur in the assembled rotor 20. The durability of 20 can be increased. It should be noted that by increasing the durability of the rotor 20, it is possible to further reduce the thickness of the magnet covering portion 243 and the connecting portion 245. Thus, by reducing the thickness of the magnet covering portion 243 and the connecting portion 245, the magnetic flux density in the gap can be improved and the leakage magnetic flux passing through the connecting portion 245 can be reduced. Further, since heating equipment for performing shrink fitting is not necessary, the rotor 20 can be assembled by a simple method. Here, since a wind power generation system is generally used for a long period of time, high durability is required. In general, a rotor used for a generator of a wind power generation system is difficult to assemble because of its large size. In this case, in this embodiment, since durability of the rotor 20 can be improved and the rotor 20 can be assembled by a simple method, the generator 1 suitable for the wind power generation system 100 can be provided. .

  In the present embodiment, as described above, the rotor core 24 is configured to be divided in the circumferential direction so as to include the plurality of core portions 25. If comprised in this way, since the rotor core 24 can be manufactured with the core part 25 which is smaller in size than the rotor core 24 and is less likely to cause defects, the yield can be improved.

  In the present embodiment, as described above, the nut 41 and the bolt 42 are arranged at the boundary portion of the plurality of core portions 25. If comprised in this way, since two adjacent core parts 25 are fixed with a pair of nut 41 and volt | bolt 42, it will suppress that a level | step difference arises in the outer peripheral part of the rotor core 24 in the boundary part of the several core part 25 can do.

  In the present embodiment, as described above, the rotor core 24 is formed in a cylindrical shape having an inner peripheral surface disposed on the outer peripheral surface of the rotor yoke 23. The plurality of core portions 25 constituting the rotor core 24 are formed so as to have substantially the same shape obtained by dividing the cylindrical shape at substantially equal angular intervals. If comprised in this way, unlike the case where each shape of the several core part 25 is varied, the yield of manufacture of the core part 25 can be improved.

  In the present embodiment, as described above, the rotor core 24 (rotor cores 24a and 24b) includes the plurality of first magnetic pole portions 241a (241b) having the permanent magnets 30 (31) and the permanent magnets 30 (31). A plurality of second magnetic pole portions 242a (242b) not to be arranged are arranged alternately one by one in a circumferential shape. Further, the nut 41 and the bolt 42 are disposed in a portion corresponding to the second magnetic pole portion 242a (242b) on the inner peripheral portion of the rotor core 24a (24b). If comprised in this way, since the nut 41 and the volt | bolt 42 will be arrange | positioned in the part where distribution of the magnetic flux which generate | occur | produces from the permanent magnet 30 (31) becomes the most sparse, it will be magnetic to the generator 1 with the nut 41 and the volt | bolt 42. It is possible to suppress the occurrence of adverse effects.

  In the present embodiment, as described above, the nut 41 extends in the axial direction toward the rotor core 24 and is configured to include a plurality of screw holes 41a along the axial direction. A plurality of bolts 42 are arranged along the direction in which the nut 41 extends, and are screwed into the plurality of screw holes 41 a of the nut 41. With this configuration, the rotor core 24 and the rotor yoke 23 are axially connected by the nut 41 extending in the axial direction and the plurality of bolts 42 screwed into the plurality of screw holes 41a provided in the nut 41 along the axial direction. And the number of nuts 41 (the number of parts) can be reduced.

  In the present embodiment, as described above, the nut insertion hole 25a for inserting the nut 41 and the groove portion 25b for connecting the nut insertion hole 25a and the inner peripheral surface of the rotor core 24 are formed in the inner peripheral portion of the rotor core 24. Provide. Further, the nut insertion hole 25a and the groove portion 25b are provided so as to extend in the axial direction of the rotor core 24, and the groove width W1 of the groove portion 25b is made smaller than the hole width W2 of the nut insertion hole 25a (see FIG. 7). Form. Further, the plurality of bolts 42 are screwed into the plurality of screw holes 41a of the nut 41 inserted into the nut insertion holes 25a via the groove portions 25b extending in the axial direction. If comprised in this way, since the groove width W1 of the groove part 25b is smaller than the hole width W2 of the nut insertion hole 25a, the nut 41 inserted in the nut insertion hole 25a will be on the inner peripheral part side (groove part 25b side) of the rotor core 24. Moving (dropping out) can be suppressed. Further, since the groove 25b can be used as a guide when the bolt 42 is inserted into the nut 41 side of the nut insertion hole 25b, the bolt 41 can be easily screwed into the screw hole 41a of the nut 41.

  In the present embodiment, as described above, the rotor 20 is provided with the disk-shaped rotor wheel 22 that surrounds the shaft 21 and is in contact with the inner peripheral surface of the rotor yoke 23. Further, the rotor yoke 23 is formed in a cylindrical shape in which the axial length L is larger than the thickness t of the disk-shaped rotor wheel 22 (see FIGS. 5 and 6), and the inner peripheral surface of the cylindrical rotor yoke 23 A plurality of bolt insertion holes 23a are formed along the axial direction at a portion protruding from the rotor wheel 22. Further, the plurality of bolts 42 are screwed into the plurality of screw holes 41a of the nut 41 disposed so as to extend in the axial direction toward the rotor core 24 via the plurality of bolt insertion holes 23a. With this configuration, the plurality of bolts 42 are connected to the rotor core 24 side from the inside of the rotor yoke 23 through the plurality of bolt insertion holes 23a formed in the portion of the inner peripheral surface of the rotor yoke 23 that protrudes from the rotor wheel 22. Can be easily inserted into.

  In the present embodiment, as described above, the first key insertion groove 23b extending in the axial direction is formed on the outer peripheral surface of the rotor yoke 23, and the first key insertion groove of the rotor yoke 23 is formed on the inner peripheral portion of the rotor core 24. A second key insertion groove 25c is formed so as to correspond to 23b. Further, the key member 43 is inserted into the key insertion hole 60 formed by the first key insertion groove 23b and the second key insertion groove 25c. With this configuration, the key member 43 can prevent the rotor yoke 23 from idling inside the rotor core 24.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the example which applied this invention to the generator of the wind power generation system was shown, this invention is not limited to this. The present invention is applicable to general rotating electrical machines such as generators and motors used in power generation systems other than wind power generation systems.

  Moreover, in the said embodiment, although the cross-sectional shape of the permanent magnet was made into the substantially trapezoid shape, this invention is not limited to this. In the present invention, for example, the cross-sectional shape of the permanent magnet may be a rectangular shape.

  Moreover, in the said embodiment, although the example using the rotor core of a consequent pole structure was shown, this invention is not limited to this. In the present invention, a rotor core having a structure other than the consequent pole structure may be used.

  Moreover, in the said embodiment, although the example which was divided | segmented into the circumferential direction so that a rotor core might contain a several core part was shown, this invention is not restricted to this. In the present invention, the rotor core may be configured as one component.

  Moreover, in the said embodiment, although the nut and the volt | bolt showed the example arrange | positioned in the boundary part of a some core part, this invention is not restricted to this. In the present invention, the nut and the bolt may not be arranged at the boundary portion of the plurality of core portions.

  In the above embodiment, the key member is inserted axially into the key insertion hole formed by the first key insertion groove of the rotor core and the second key insertion groove of the rotor yoke. Not exclusively. In the present invention, first, the key member may be inserted into the second key insertion groove of the rotor yoke. In this case, the plurality of core portions are arranged circumferentially on the outer peripheral surface of the rotor yoke while inserting the key member into the first key insertion groove. At this time, the groove portion of the inner peripheral portion of the core portion and the bolt insertion hole penetrating the inner peripheral surface and the outer peripheral surface of the rotor yoke are aligned. Thereafter, the rotor yoke and the rotor core are fastened with nuts and bolts.

  Moreover, although the example which fastens a rotor yoke and a rotor core using a nut and a volt | bolt was shown in the said embodiment, this invention is not limited to this. In the present invention, the rotor yoke and the rotor core may be fastened using a fastening member such as a caulking member other than a nut and a bolt. Moreover, in this invention, you may fasten a rotor yoke and a rotor core using only a volt | bolt, for example by forming a screw hole in a rotor core.

  In the above-described embodiment, an example in which the rotor core is configured by two rotor cores stacked in the axial direction while being shifted by a predetermined angle in the rotation direction has been described, but the present invention is not limited thereto. In the present invention, the rotor core may be constituted by one rotor core, or may be constituted by three or more rotor cores. If the rotor core is composed of an even number of rotor cores, magnetic flux can be generated in a balanced manner when viewed from the axial direction in the gap between the rotor core and the stator core.

  Moreover, in the said embodiment, although the rotor hub was attached to the rotating shaft of the generator, the present invention is not limited to this. In the present invention, a gear box 6 may be provided between the rotor hub 3 and the generator 1 as in the wind power generation system 101 according to the modification shown in FIG.

1 Generator (Rotating electric machine)
4 Blade 10 Stator 20 Rotor 21 Shaft (Rotating shaft)
22 Rotor wheel (support member)
23 Rotor yoke 23a Bolt insertion hole 23b Second key insertion groove 24, 24a, 24b Rotor core 25 Core part 25a Nut insertion hole 25b Groove part 25c First key insertion groove 30, 31 Permanent magnet 41 Nut (fastening member)
41a Screw hole (screwed part)
42 Bolt (fastening member)
43 Key member 60 Key insertion hole 100, 101 Wind power generation system 241a, 241b First magnetic pole part 242a, 242b Second magnetic pole part

Claims (10)

A rotor including a rotating shaft portion, a rotor yoke surrounding the rotating shaft portion, and a rotor core disposed on the outer peripheral surface of the rotor yoke and in which a plurality of permanent magnets are embedded circumferentially at intervals;
A stator arranged to face the outer peripheral surface of the rotor,
The rotor core is configured by alternately arranging a plurality of first magnetic pole portions having the permanent magnet and a plurality of second magnetic pole portions not having the permanent magnet one by one,
A rotating electrical machine in which the rotor yoke and an inner peripheral portion of the rotor core are fastened by a fastening member disposed at a portion corresponding to the second magnetic pole portion of the rotor core. The rotor core is configured to be divided in the circumferential direction so as to include a plurality of core portions,
Each of the plurality of core portions is
The first magnetic pole portion adjacent in the circumferential direction of the rotor core;
The rotating electrical machine according to claim 1, comprising: the second magnetic pole portion disposed between the adjacent first magnetic pole portions.   3. The rotating electrical machine according to claim 1, wherein the fastening member presses an inner peripheral portion of the rotor core against an outer peripheral surface of the rotor yoke, whereby the rotor yoke and the inner peripheral portion of the rotor core are fastened. The rotor core is configured to be splittable at the second magnetic pole portion,
The rotating electrical machine according to claim 2, wherein the fastening member is disposed at a boundary portion of the plurality of core portions. The rotor core is formed in a cylindrical shape having an inner peripheral surface disposed on the outer peripheral surface of the rotor yoke,
5. The rotating electrical machine according to claim 2, wherein each of the plurality of core portions is formed to have substantially the same shape obtained by dividing a cylindrical shape at substantially equal angular intervals. The fastening member includes a nut and a bolt screwed into the nut,
The nut extends in the axial direction on the rotor core side, and includes a plurality of screwing portions along the axial direction,
The rotating electric machine according to any one of claims 1 to 5, wherein a plurality of the bolts are arranged along a direction in which the nut extends, and are screwed into a plurality of screwed portions of the nut. The inner peripheral portion of the rotor core is provided with a nut insertion hole for inserting the nut, and a groove portion connecting the nut insertion hole and the inner peripheral surface of the rotor core,
The nut insertion hole and the groove portion are provided so as to extend in the axial direction of the rotor core, and the groove width of the groove portion is formed to be smaller than the hole width of the nut insertion hole,
The rotating electrical machine according to claim 6, wherein the plurality of bolts are screwed into a plurality of screwed portions of the nut inserted into the nut insertion hole through the groove portion extending in the axial direction. The rotor further includes a disk-shaped support member that surrounds the rotating shaft portion and is in contact with the inner peripheral surface of the rotor yoke,
The rotor yoke is formed in a cylindrical shape whose axial length is larger than the thickness of the disk-shaped support member, and a portion of the inner peripheral surface of the cylindrical rotor yoke that protrudes from the support member Including a plurality of bolt insertion holes formed along the axial direction,
The plurality of bolts are screwed into a plurality of screwed portions of the nut arranged to extend in the axial direction toward the rotor core through the plurality of bolt insertion holes. Rotating electric machine. A first key insertion groove extending in the axial direction is formed in the inner peripheral portion of the rotor core,
A second key insertion groove is formed on the outer peripheral surface of the rotor yoke so as to correspond to the first key insertion groove of the rotor core,
The rotating electrical machine according to any one of claims 1 to 8, wherein a key member is inserted into a key insertion hole formed by the first key insertion groove and the second key insertion groove. A generator including a rotor and a stator disposed to face the outer peripheral surface of the rotor;
A blade connected to the rotating shaft portion of the rotor of the generator,
The rotor is
A rotating shaft,
A rotor yoke surrounding the rotating shaft portion;
A rotor core disposed on the outer peripheral surface of the rotor yoke, and having a plurality of permanent magnets embedded circumferentially at intervals;
The rotor core is configured by alternately arranging a plurality of first magnetic pole portions having the permanent magnet and a plurality of second magnetic pole portions not having the permanent magnet one by one,
A wind power generation system in which the rotor yoke and an inner peripheral portion of the rotor core are fastened by a fastening member disposed at a portion corresponding to the second magnetic pole portion of the rotor core.

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