JP5504813B2 - Rotor core holding structure, variable field embedded magnet type rotating electric machine having the holding structure - Google Patents

Description

The present invention relates to a holding structure for a rotor core of a variable field embedded magnet type rotating electrical machine that changes the field of a rotor having an embedded magnet structure.

In a conventional variable field embedded magnet type rotating electrical machine, the magnetic pole of the rotor of the embedded magnet structure is divided into three in the axial direction, and each of them is rotated relative to each other to change the rotor field. (For example, refer to Patent Document 1).
FIG. 20 is an explanatory view of the structure of a conventional rotor of a variable field embedded magnet type rotating electric machine, which is shown in Patent Document 1, p12, and FIG.
In the figure, the magnetic poles of the rotor are divided into three in the axial direction, the load-side magnetic pole portion 1 and the anti-load-side magnetic pole portion 2 fixed to the shaft 4, and the central magnetic pole portion 3 that rotates relative to the magnetic pole portion. A permanent magnet 13 is attached to each magnetic pole portion.
The load-side magnetic pole part and the anti-load-side magnetic pole part are fixed to the shaft via a fixed hub, the central magnetic pole part is fixed to the movable hub 8, and guide grooves 7a and 8a are provided in the fixed hub and the movable hub, and the guide is provided. By the centrifugal weight 5 mounted in the groove, the relative rotation angle of the central magnetic pole part with respect to the load-side magnetic pole part and the anti-load-side magnetic pole part is regulated.
When the rotational speed of the rotor is low, the centrifugal weight provided on such a rotor is located on the rotating shaft side by the biasing of a torsion spring (not shown), and the load side magnetic pole part, the anti-load side magnetic pole part, and the central magnetic pole Since the N pole and S pole of the part are aligned in the axial direction and the field is large, high torque can be generated.
When the rotational speed of the rotor increases, the centrifugal force acting on the centrifugal weight exceeds the urging force of the torsion spring, the centrifugal weight moves toward the outer periphery of the rotor, and when the centrifugal weight reaches the outermost side, The N pole and S pole of the magnetic pole part, the anti-load side magnetic pole part, and the central magnetic pole part are alternately positioned in the axial direction, and the field is small.
In a state where the field is small, the magnetic flux linked to the stator winding is canceled and the induced voltage becomes small, so that it is possible to drive up to a higher rotation range. In addition, the magnetic flux generated from the permanent magnet is short-cut in the axial direction between the load-side magnetic pole part, the anti-load-side magnetic pole part and the central magnetic pole part, and the magnetic flux exiting the rotor is drastically reduced, so it passes through the stator core. It is excellent in that the magnetic flux itself can be reduced and the iron loss generated in the stator core can be further reduced.
As described above, the variable field embedded magnet type rotating electric machine of Patent Document 1 changes the field of the rotor by using the centrifugal force generated by the rotation of the rotor, thereby increasing the high torque in the low rotation range, It achieves driving up to the rotation range, reduces iron loss in the high rotation range, and enables higher rotation and higher efficiency.

By the way, in the rotor of the variable field embedded magnet type rotating electrical machine disclosed in Patent Document 1, at the relative rotation surfaces of the load side magnetic pole part, the anti-load side magnetic pole part, and the central magnetic pole part, attractive force or repulsive force is generated between the magnetic pole parts. Works. For example, a strong attractive force acts in a state where the N pole and the S pole are alternately positioned in the axial direction of the load side magnetic pole part, the anti-load side magnetic pole part, and the central magnetic pole part. If both magnetic pole portions are attracted and interfere with each other, a large friction torque is added, and thus the torque required for relative rotation increases. If a large gap is provided so that the two magnetic pole parts do not interfere with each other, the magnetic flux generated by the permanent magnet will be difficult to short-cut between the magnetic pole parts in the axial direction when the field is small, and will occur in the stator core. The effect of reducing iron loss is reduced. Therefore, it is desirable that both magnetic pole portions are close to each other.
Since the rotor core is made of laminated electromagnetic steel plates, the structure in which the magnetic steel plates are maintained in a laminated state against a strong attractive force and the magnetic pole portions are close to each other without interfering with each other is the variable field buried of Patent Document 1. This is necessary for the internal magnet type rotating electric machine.

There is an example in which a laminated steel plate of a rotor that is not a rotating electrical machine is fastened with rivets. (For example, refer to Patent Document 2).
FIG. 21 is an explanatory view of the structure of a conventional vane pump rotor, which is shown in Patent Document 2, p6 and FIG.
In the figure, the rotor 10 is fastened by a rivet 15 to a pair of clamping members 12 disposed at both ends in the axial direction and a laminated steel plate 14 disposed therebetween. A countersink 16 is formed in the clamping member, and a rivet caulking portion is accommodated in that portion. By fastening the rivets, the laminated steel plates can be firmly integrated.
FIG. 22 is another structural explanatory diagram of the vane pump rotor, which is shown in Patent Document 2, p9, and FIG.
In the figure, the rotor 80 directly fastens the laminated steel plate 82 with rivets 86 without using the clamping member 12 shown in FIG. Countersunk holes 84 are formed at both ends of the laminated steel plate, and rivet caulking portions are accommodated in these portions. Therefore, fastening within the axial length of the laminated steel sheet is achieved.
As described above, there is an example in which a laminated steel plate of a rotor that is not a rotating electrical machine is fastened with rivets.

JP 2007-2559531 A (page 11, FIG. 2) JP 2002-021746 (page 6, FIG. 1 and page 9, FIG. 9)

The conventional variable field embedded magnet type rotating electrical machine shown in Patent Document 1 is divided in the axial direction, and a strong attractive force acts between the relatively rotating magnetic pole portions, so that the magnetic pole portions do not interfere with each other. However, a specific structure for firmly fastening the laminated electromagnetic steel sheets constituting the rotor core is not shown.

When considering using the conventional laminated steel plate fastening method shown in Patent Document 2 for a variable field embedded magnet type rotating electrical machine, the structure using the clamping member shown in FIG. The part is housed in the countersink part of the clamping member, so that both magnetic poles can be arranged close to each other on the relative rotation surface, but since the clamping member is not a thin electromagnetic steel plate, iron loss increases due to an increase in eddy current. Will increase.
In the structure that does not use the clamping member shown in FIG. 22, the rivet caulking portion is housed in the countersunk portion of the laminated steel plate, so that both magnetic pole portions can be made close to each other on the relative rotation surface. Since the press margin of the rivet caulking portion to the end steel plate is small, it is easy to drop off and cannot be firmly integrated.

The present invention has been made in view of such problems, and provides a holding structure for a rotor core that is divided in the axial direction and can be approached without interference between both magnetic pole portions that rotate relative to each other. It is an object of the present invention to provide a variable field embedded magnet type rotating electrical machine having a small loss and a small torque required for relative rotation.

In order to solve the above problems, the present invention provides a variable field embedded magnet type rotating electrical machine in which a rotor core of an embedded magnet type rotating electrical machine is divided in the axial direction, and each of them is relatively rotated to change a field. The rotor core is composed of laminated electromagnetic steel sheets, and the outermost layer of the electromagnetic steel sheet on the relative rotation surface side of the rotor core has a head portion of a member that holds the laminated state of the rotor core. The rotor core having a seat receiving portion and a housing portion of the head integrally and three-dimensionally provided so as to be housed inward from the end surface on the relative rotation surface side , excluding the outermost electromagnetic steel plate Has a rotor core holding structure characterized by having a hole formed in a shape close to the seat receiving portion .
According to the present invention, the member is a rivet, and the rotor core holding structure is provided.
According to the present invention, the member is a rotor core holding structure, wherein the member is a screw.
Moreover, this invention makes it a rotor using the holding structure of the said rotor core.
The present invention also provides a variable field embedded magnet type rotating electrical machine having the rotor.

According to the present invention,
The rotor core is composed of laminated electromagnetic steel sheets, and the outermost magnetic steel sheet on the side of the relative rotation surface of the rotor core is such that the head of the member that holds the laminated state of the rotor core is the relative rotation. The rotor core having the seat receiving portion and the storage portion of the head provided integrally and three-dimensionally so as to be stored inward from the end surface on the moving surface side, excluding the electromagnetic steel sheet of the outermost layer, Because it has a hole formed in a shape that can be in close contact with the seat receiving part, the two magnetic pole parts that rotate relative to each other are close to each other without interfering, the iron loss is small, the torque required for relative rotation is small, and control It is possible to provide a variable field embedded magnet type rotating electrical machine having good performance.
Moreover, according to the present invention,
Since the member is a rivet, the member can be securely fastened and an inexpensive rotor core holding structure can be provided.
Moreover, according to the present invention,
Since the member is a screw, it is possible to provide a rotor core holding structure that can be securely fastened and disassembled.
Moreover, according to the present invention,
Since the rotor uses the holding structure, it is possible to provide a rotor for a variable field embedded magnet type rotating electrical machine that requires a small torque for relative rotation.
Moreover, according to the present invention,
Since the variable field embedded magnet type rotary electric machine having the rotor is provided, it is possible to provide a variable field embedded magnet type rotary electric machine having a small iron loss, a small torque required for relative rotation, and good controllability.

1 is a sectional view in the axial direction of a variable field embedded magnet type rotating electric machine showing a first embodiment of the present invention Radial sectional view of the rotating electrical machine The perspective view which shows the rotation which changes the field of the said rotor An exploded perspective view showing the structure of the rotor The perspective view of the decomposition | disassembly state which shows the structure of the magnetic pole part of the center of the said rotor, and a shaft Explanatory drawing of a state where the field of the rotor is small Axial sectional view of the rotor Axial sectional view of load side magnetic pole Explanatory drawing of the steel plate at the end of the rotor core on the relative rotation surface side Illustration of the rotor core excluding the steel plate at the end on the relative rotation surface side Explanatory drawing of the parts composing the load side magnetic pole Explanatory drawing of the process of caulking the rivet of the load side magnetic pole Illustration of rivet shape types Illustration of fastening with rivets with problems Axial cross-sectional view of the central magnetic pole Illustration of the rotor core excluding the steel plate at the end of the central magnetic pole Explanatory drawing of the parts that make up the central magnetic pole Axial sectional view of the anti-load side magnetic pole Explanatory drawing of the parts composing the anti-load side magnetic pole Conventional structure of rotor of variable field embedded magnet type rotating electrical machine Conventional structure of vane pump rotor Another structural explanatory view of the vane pump rotor

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

FIG. 1 is a cross-sectional view in the axial direction of a variable field embedded magnet type rotating electrical machine showing a first embodiment of the present invention for use in a vehicle drive motor or generator.
In the figure, the rotating electrical machine includes a stator 40 having a stator core 43 and a stator winding 42, and a rotor 50 having an embedded magnet structure capable of changing a field using hydraulic pressure.
Energization of the stator winding is performed via the lead wire 41. The stator is fastened to the load side bracket 31 with a stator fastening bolt 44, and the anti-load side bracket 32 is fastened to the load side bracket together with the frame 45 with bolts (not shown).
The rotor is rotatably held by the load-side bracket and the anti-load-side bracket via a load-side bearing 33 and an anti-load-side bearing 34 installed on the rotor shaft 51, and is a hydraulic mechanism provided inside the rotor. The hydraulic pressure can be supplied to 49 to change the field. An encoder unit 37 for detecting the rotational position of the rotor is installed on the opposite side of the rotor shaft.
A hydraulic control unit 48 that changes the magnetic field of the rotor is integrally provided in the bearing portion of the non-load side bracket.
The anti-load side bracket includes a high-pressure oil inlet for supplying oil from an external oil pump (not shown) to the hydraulic control unit, a return oil outlet for returning oil from the hydraulic control unit to the oil pump, and the rotor A discharge oil outlet is provided for discharging the oil released into the oil pump to the oil pump. The oil can circulate between the oil pump and the rotating electric machine, and can be continuously operated. The load side oil seal 35, the anti-load side oil seal 36, and the cover 38 prevent the oil released to the inside of the rotating electrical machine from flowing out to the outside.
The anti-load side oil seal is formed by baking a rubber film on a steel ring, and seals the oil and fixes a fitting part 71 that supplies oil to the shaft in the axial direction.
In the rotor, the rotor core is divided into three in the axial direction, and each is fastened with rivets 62, 63, 64.

FIG. 2 is a radial sectional view of the rotating electrical machine.
In the drawing, a permanent magnet mounting hole 54a having a substantially V shape provided in the rotor core 54 is adjacent to the outer side in the radial direction of the permanent magnet so that the permanent magnet 52 faces or backs the magnetizing direction. It is mounted together with the resin component 53 to form a 10-pole magnetic pole.
The rotor core is fastened by a rivet 63 at a pole shoe 54p of the rotor core, and the rotor core is mounted on the movable hub 55 and is rotated relative to the shaft 51 by a hydraulic mechanism 49 inside the movable hub. To do.

FIG. 3 is a perspective view showing the rotation for changing the field of the rotor.
In the figure, the rotor has a load-side magnetic pole portion 50a divided into three in the axial direction, a central magnetic pole portion 50b, and an anti-load-side magnetic pole portion 50c, and the load-side magnetic pole portion and the anti-load-side magnetic pole portion. Is fixed to the shaft 51 with a bolt 58 and the central magnetic pole portion is rotated with respect to the shaft.
Each of the three magnetic pole portions has 10 magnetic poles in which N poles and S poles are alternately arranged in the circumferential direction, and the central magnetic pole portion 50b rotates as shown by the rotation Ri toward the magnetizing side. In a state where the same magnetic poles are arranged in the axial direction, the rotor field is in a large state. In the state where the central magnetic pole portion rotates as indicated by the rotation Rd toward the demagnetization side and different magnetic poles are arranged in the axial direction, the rotor field is small.
When the rotor field is large, high torque can be generated. However, since the induced voltage with respect to the rotational speed is also large, the power source can only be operated in a low rotational range. In a state where the rotor field is small, only low torque can be generated. However, since the induced voltage with respect to the rotation speed is small, the power supply can be operated up to a high rotation range. The central magnetic pole portion of the rotor of the present embodiment can be rotated by one magnetic pole, and can be rotated to an arbitrary position by using a hydraulic mechanism, so that torque from low rotation to high rotation can be obtained. By adjusting the induced voltage, it is possible to achieve both torque increase and operation up to a high rotation range.
FIG. 4 is an exploded perspective view showing the structure of the rotor.
In the figure, the load-side magnetic pole part 50a and the anti-load-side magnetic pole part 50c are fixed to the bolt hole 51a of the shaft with a bolt 58. By introducing high-pressure oil into a hydraulic mechanism 49 provided inside the movable hub 55 that supports the central magnetic pole portion 50b, the central magnetic pole portion includes a load-side magnetic pole portion fixed to the shaft and an anti-load side. It is structured to be rotated with respect to the magnetic pole part.
The central magnetic pole portion mounted on the movable hub fastens the pole shoe of the rotor core 54 with a rivet 63. Similarly, the pole shoe of the rotor core is fastened to the load side magnetic pole portion and the anti-load side magnetic pole portion by rivets.
The magnetic pole portion and the magnetic pole portion are close to each other so that the magnetic flux of the permanent magnet is easily short-circuited in the axial direction, but a thrust washer 61 may be provided between the magnetic pole portions in order to smoothly perform relative rotation.
When an iron thrust washer is used, there is an effect of smoothing the relative rotation of the magnetic pole part at the center, but there is a drawback that the leakage flux increases and the maximum torque decreases. When a stainless steel washer is used, the maximum torque is not reduced, but there is a drawback that the effect of reducing iron loss is reduced when the field is reduced. Therefore, it is desirable to improve the flatness of the relative rotation surface of the magnetic pole part without using a thrust washer, and to make the magnetic pole part and the magnetic pole part close to each other so that the magnetic flux of the permanent magnet is easily short-circuited in the axial direction.

FIG. 5 is an exploded perspective view showing the structure of the central magnetic pole portion and the shaft of the rotor.
In the figure, a hydraulic seal component 59 is mounted on the sliding surface of the shaft 51 and the movable hub 55 to the hydraulic seal portion 51b of the shaft and the hydraulic seal portion 55c of the movable hub, and the low pressure from the high pressure side hydraulic chamber of the hydraulic mechanism 49. Oil leakage to the side hydraulic chamber is prevented.
The permanent magnet 52 mounted on the rotor is mounted in the permanent magnet mounting hole 54a of the rotor core together with the resin component 53 adjacent to the outer side in the radial direction of the permanent magnet.

FIG. 6 is an explanatory diagram of a state in which the rotor has a small field.
In the figure, in the state where the N pole and the S pole are alternately positioned in the axial direction of the load side magnetic pole part 50a, the anti-load side magnetic pole part 50c and the central magnetic pole part 50b, the magnetic flux interlinked with the stator winding cancels out. In addition, since the induced voltage becomes small, it is possible to drive up to a higher rotation range. Further, as shown in the image F of the magnetic flux, the magnetic flux generated from the permanent magnet is short-cut in the axial direction between the load side magnetic pole part, the anti-load side magnetic pole part, and the central magnetic pole part, and the magnetic flux itself passes through the stator core. The iron loss generated in the stator core can be reduced.

FIG. 7 is an axial sectional view of the rotor.
In the figure, the rotor core 54 constituting the load side magnetic pole part 50a, the anti-load side magnetic pole part 50c and the central magnetic pole part 50b is fastened in the axial direction with a rivet at the pole shoe part of the rotor core. The load-side magnetic pole portion fastens the rotor core to the load-side fixing plate 56, the anti-load-side magnetic pole portion fastens the rotor core to the anti-load-side fixing plate 57, and the central magnetic pole portion is only the rotor core. Are fastened in the axial direction with rivets.
In the rotor of the present embodiment, an attractive force or repulsive force close to 1 ton acts between the load side magnetic pole part or the anti-load side magnetic pole part and the central magnetic pole part. For example, as the central magnetic pole part rotates and different magnetic poles approach, a large attractive force G is generated between the magnetic pole parts, and if the rotor core is not firmly fastened in the axial direction, it is in close contact and relative rotation Becomes difficult. In order to fasten the rotor core against an attractive force close to 1 ton, when welding is used as a strong fastening means for the rotor core, the eddy current loss of the rotor core increases characteristically and mechanical In this case, thermal deformation of the rotor core due to welding is likely to occur. Rivets are used as another fastening means to overcome these problems.

By fastening the rotor core of each magnetic pole part with a rivet, the attracting force or repulsive force acts on the central magnetic pole part from both sides and cancels, so that the central magnetic pole part is one of the magnetic pole parts on both sides. Therefore, it is possible to prevent the generation of friction torque that hinders rotation.
In addition, a part of the oil used for the hydraulic mechanism that performs the rotation is discharged to the outside of the rotor after being used for lubrication of the sliding portion between the magnetic pole portions. Since it is not attracted to one of the magnetic pole portions on both sides, an oil film is easily formed on the two sliding surfaces, and the hydraulic mechanism can rotate the central magnetic pole portion with a minimum hydraulic pressure.
As shown in FIG. 5, the rotor core constituting the central magnetic pole portion 50b is engaged with the movable hub 55 by the angular spline 55a in order to withstand the load torque. Similarly, the rotor iron core constituting the load side magnetic pole part engages with the load side fixing hub 65 and the angular spline, and the rotor iron core constituting the anti load side magnetic pole part is constituted with the anti load side fixing hub 66 and the angular spline. It is contracted.
The load-side fixing plate and the load-side fixing hub that hold the load-side magnetic pole part, and the anti-load-side fixing plate and the anti-load-side fixing hub that hold the anti-load-side magnetic pole part are fixed to the shaft 51 with bolts 58.

FIG. 8 is a sectional view in the axial direction of the load-side magnetic pole part.
In the figure, the head of the rivet 62 holding the rotor core has a conical shape, and the rivet head 62a is provided on the inner side of the end surface on the relative rotation surface side of the rotor core so that the rotor cores are brought close to each other. ing. Therefore, the magnetic flux can easily be short-cut in the axial direction between the load-side magnetic pole part and the central magnetic pole part, and the iron loss generated in the stator core can be reduced when the rotor field is small.
Further, only the steel plate 67 at the end is formed into a special shape at the end on the relative rotation surface side of the rotor core.

FIG. 9 is an explanatory diagram of a steel plate at the end of the rotor core on the side of the relative rotation surface.
In the figure, a steel plate 67 at the end of the rotor core on the side of the relative rotation surface is provided with a rivet head seat receiving portion 67a and a rivet head storage portion 67b in three dimensions. Therefore, a plurality of inner steel plates can be fastened with rivets via the end steel plates, and there is no need for a clamping member for holding the rivet as shown in FIG. It has a structure that is difficult to peel off.

FIG. 10 is an explanatory diagram of the rotor core excluding the steel plate at the end on the relative rotation surface side.
In the figure, the rotor core 54 excluding the steel plate at the end on the relative rotation surface side is formed by laminating electromagnetic steel plates. A portion corresponding to the seat receiving portion of the head portion of the rivet of the steel plate at the end portion on the relative rotation surface side is formed by processing of the drill 68 after lamination.

FIG. 11 is an explanatory diagram of components constituting the load-side magnetic pole part.
In the drawing, a rivet head seat receiving portion 67a of a steel plate 67 at the end is brought into close contact with the rotor core 54 having a rivet head seat receiving portion formed by drilling, and the load side fixing plate is held by the rivet 62. Fastened to 56. Further, the load side fixing hub 65 is engaged with the inner periphery of the rotor core.

FIG. 12 is an explanatory diagram of a process of caulking the rivet of the load side magnetic pole part.
In the figure, the rivet 62 is fastened together with the steel plate 67 at the end, the rotor core 54, and the load-side fixing plate 56 by caulking the end of the rivet with a caulking jig 79.

FIG. 13 is an explanatory diagram of the types of rivet shapes.
As shown in (a) of the figure, on the relative rotational surface side of the rotor core, drilling is performed after laminating the rotor core 54 in contact with the seat receiving portion 67a of the rivet head 62a of the steel plate at the end. Instead of performing the above, a steel plate 54b provided with holes in advance during press forming may be used.
Further, the head of the rivet 62 may have a conical shape as shown in (a), or may have a cylindrical shape as shown in (b). Further, the screw 69 may be used to fasten the load side fixing plate 70 without using rivets. At that time, as shown in (b), the end of the rotor core on the relative rotation surface side so that the head portion 69a of the rivet or screw is inside the end surface on the relative rotation surface side of the rotor core. The steel plate 68 is a three-dimensionally provided seat receiving portion 68a of a rivet or screw head 69a and a storage portion 68b of the rivet head. Regardless of whether the rivet or screw head 69a is conical or cylindrical, it is the same that the rotor core is fastened through the steel plate at the end, but the cylindrical shape is provided with holes beforehand. This is advantageous in terms of cost in that the size of the holes in the steel plate 54c may be the same.

FIG. 14 is an explanatory diagram of fastening with a rivet having a problem.
FIG. 14 (a) is assumed without using the steel plate 67 at the end portion in which the seat receiving portion 67 a of the rivet head and the storage portion 67 b of the rivet head shown in FIG. When the rotor core 76 is fastened with rivets 74 and 75, the rivet heads 74a and 75a are bulky, and the rotor cores cannot be brought close to each other.
Further, as shown in (b), following Patent Document 2, p9, and FIG. 9, the head of the rivet 72 has a conical shape, and the head of the rivet is located on the inner side of the end surface on the side of the relative rotation surface of the rotor core. The steel plate 78 at the end portion has a small rivet holding allowance, so that it easily falls off and cannot be firmly integrated.

FIG. 15 is an axial cross-sectional view of the central magnetic pole portion.
In the figure, the magnetic pole part 50b at the center is the end steel plate 67 shown in FIG. 9 in which the seat receiving part 67a of the rivet head and the storage part 67b of the rivet head are three-dimensionally provided. Used on both sides of the rotor core, a plurality of inner steel plates are fastened with rivets through the steel plates at the ends.

FIG. 16 is an explanatory diagram of the rotor core excluding the steel plate at the end of the central magnetic pole portion.
In the drawing, the rotor core excluding the steel plate at the end on the relative rotation surface side is formed by laminating electromagnetic steel plates. The portion corresponding to the seat receiving portion of the head of the rivet of the steel plate 67 at the end on the relative rotation surface side is formed by drilling after lamination.

FIG. 17 is an explanatory diagram of components constituting the central magnetic pole portion.
In the figure, a steel plate 67 at the end is brought into intimate contact with a rotor core 54 in which a seat receiving portion of a rivet head is formed by drilling, and a rivet 63 is fastened together with a seat receiving portion 67a of the rivet head. Further, the movable hub 55 is engaged with the inner periphery of the rotor core.

FIG. 18 is an axial cross-sectional view of the anti-load side magnetic pole portion.
In the figure, the head of the rivet 64 that holds the rotor core has a conical shape, and the rivet head 64a is provided on the inner side of the end surface on the relative rotation surface side of the rotor core so that the rotor cores are brought close to each other. ing.

FIG. 19 is an explanatory diagram of components constituting the anti-load side magnetic pole portion.
In the figure, an anti-load-side magnetic pole portion 50c is brought into close contact with a rotor iron core 54 in which a seat receiving portion of a rivet head is formed by drilling, with a steel plate 67 at the end being aligned with a seat receiving portion 67a of the rivet head. Fasten with rivets 64. Further, the anti-load side fixing hub 66 is engaged with the inner periphery of the rotor core.

The present invention is different from Patent Document 1 in that it is a part showing a specific structure for firmly fastening the laminated electrical steel sheets constituting the rotor core in a state where the magnetic pole part and the magnetic pole part are close to each other. .
The part where the present invention is different from Patent Document 2 is a part where the method of firmly fastening the electromagnetic steel sheet constituting the rotor core with rivets can be achieved using only the electromagnetic steel sheet.

The variable field embedded magnet type rotating electrical machine having the rotor core holding structure of the present invention not only achieves high torque in the low rotation range and driving up to the high rotation range, but also iron in the high rotation range. Loss can be reduced and higher rotation and higher efficiency can be achieved. Therefore, the present invention can also be applied to machine tool spindles and electric vehicle motors.

31 Load side bracket 32 Anti load side bracket 33 Load side bearing 34 Anti load side bearing 35 Load side oil seal 36 Anti load side oil seal 37 Encoder part 38 Cover
40 Stator 41 Lead Wire 42 Stator Winding 43 Stator Core 44 Stator Fastening Bolt 45 Frame 48 Hydraulic Control Unit 49 Hydraulic Mechanism 50 Rotor 51 Shaft 52 Permanent Magnet 53 Resin Component 54 Rotor Core
54a Permanent magnet mounting hole 54p Pole shoe of rotor core 55 Movable hub 58 Bolt 59 Hydraulic seal parts 62, 63, 64 Rivet 65 Load side fixing hub 66 Anti-load side fixing hub 67 Steel plate at the end

Claims (5)

In a variable field embedded magnet type rotating electrical machine that divides the rotor core of an embedded magnet type rotating electrical machine in the axial direction, relatively rotates each core, and changes the field,
The rotor core is composed of laminated electrical steel sheets,
The electrical steel sheet of the outermost layer on the relative rotation surface side of the rotor core is
The seat receiving portion and the storage portion of the head that are integrally and three-dimensionally provided so that the head portion of the member that holds the laminated state of the rotor cores is stored inside the end surface on the relative rotation surface side. Have
The rotor core, excluding the outermost electrical steel sheet,
A structure for holding a rotor core, comprising a hole formed in a shape close to the seat receiving portion . The rotor core holding structure according to claim 1, wherein the member is a rivet. The rotor core holding structure according to claim 1, wherein the member is a screw. A rotor using the rotor core holding structure according to claim 1. A variable field embedded magnet type rotating electrical machine having the rotor according to claim 4.

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