JP5971655B2 - Permanent magnet rotating electric machine - Google Patents

Description

  The present invention relates to a permanent magnet type rotating electrical machine in which a rotor is provided with a permanent magnet.

  For example, in an industrial machine, an electric vehicle, a hybrid vehicle, and the like, a permanent magnet type rotating electric machine in which a permanent magnet is provided on a rotor is often used for high output.

  Conventionally, in order to suppress the occurrence of leakage magnetic flux in the rotor, a pair of permanent magnets are arranged in a groove formed in the outer peripheral portion of the rotor core in the circumferential direction of the rotor, and between the pair of permanent magnets. Permanent magnet type in which a metal plate is inserted and a space is formed between the inner surface of the groove and the metal plate by holding the metal plate in the groove with a holding member provided between the bottom surface of the groove and the metal plate A rotating electrical machine has been proposed (see, for example, Patent Document 1).

  Conventionally, a nonmagnetic material support having a plurality of radially projecting wedges is fixed to the rotating shaft of the rotor, and the support wedge is fitted into the notch provided in the magnetic pole core of the rotor. Therefore, a permanent magnet type rotor in which a magnetic core is held on a rotating shaft has also been proposed (see, for example, Patent Document 2).

US Pat. No. 6,768,238 Japanese Utility Model Publication No. 3-97353

  However, in the permanent magnet type rotating electrical machine shown in Patent Document 1, since the metal plate is held by the rotor core via the holding member, if the position of the holding member is deviated from the rotor core, the metal plate is rotated. The position of the metal plate with respect to the core of the core is also shifted, resulting in a shift in the rotational balance of the rotor. Thereby, for example, vibration and noise of the rotating electrical machine increase, and the characteristics of the rotating electrical machine may be deteriorated.

  Moreover, in the permanent magnet type rotor shown in Patent Document 2, since the support is disposed so as to fill the space between the magnetic core and the rotation shaft, the volume of the support is increased. Thereby, the usage-amount of the material of a support body increases and cost will increase.

  The present invention has been made to solve the above-described problems, and provides a permanent magnet type rotating electrical machine that can suppress a reduction in characteristics of the rotating electrical machine and can reduce costs. With the goal.

  A permanent magnet type rotating electrical machine according to the present invention is a permanent magnet type rotating electrical machine including a cylindrical stator, and a rotor that is disposed inside the stator and is rotated with respect to the stator about an axis. The rotor includes a rotation shaft disposed on the axis, a pair of end plates disposed apart from each other in the axial direction and fixed to the rotation shaft, and the rotation shaft and the stator between the rotation shaft and the stator. A plurality of magnetic members arranged in the circumferential direction in a state separated from each of the stators and provided between the end plates, a plurality of permanent magnets held between the magnetic members in the circumferential direction, and each magnetic member Each end plate is provided with a plurality of fitting holes into which the respective connecting materials are individually fitted.

  According to the permanent magnet type rotating electric machine according to the present invention, it is possible to suppress the deterioration of the characteristics of the rotating electric machine and to reduce the cost.

It is sectional drawing which shows the permanent magnet type rotary electric machine by Embodiment 1 of this invention. It is sectional drawing along the II-II line of FIG. It is sectional drawing along the III-III line of FIG. It is sectional drawing which shows the rotor of FIG. 1 with the magnetization direction of each permanent magnet. It is an expanded sectional view which shows a part of rotor of FIG. 4 with the flow of the magnetic flux by each permanent magnet. It is an expanded sectional view which shows a rotor in case each connection material of FIG. 5 is a magnetic body. It is an expanded sectional view which shows the state which the position of a magnetic member and a connection material has shifted | deviated with respect to the rotating shaft at the time of the assembly of the rotor of FIG. It is sectional drawing which shows the rotor of the rotary electric machine by Embodiment 2 of this invention. It is sectional drawing which shows the rotor of the rotary electric machine by Embodiment 3 of this invention. It is a longitudinal cross-sectional view which shows the rotor of the rotary electric machine by Embodiment 4 of this invention. It is sectional drawing which shows the rotor of the rotary electric machine by Embodiment 5 of this invention. It is a perspective view which shows the connection material of FIG. It is sectional drawing which shows the rotor of the rotary electric machine by Embodiment 6 of this invention. It is a perspective view which shows the principal part of the connection material of FIG. It is a front view which shows a state when the connection material of FIG. 14 is seen along the axial direction of a rotor. It is a perspective view which shows the rotating shaft of the rotary electric machine by Embodiment 7 of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a cross-sectional view showing a permanent magnet type rotating electrical machine according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 is a cross-sectional view taken along the line II of FIG. In the figure, a permanent magnet type rotating electrical machine (hereinafter simply referred to as “rotating electrical machine”) 1 is disposed inside a cylindrical stator 2 and the stator 2, and the stator 2 is centered on the axis of the rotating electrical machine 1. A rotor 3 that is rotated with respect to the stator 2 and a frame 4 that supports the stator 2 and the rotor 3 in a state of surrounding the stator 2 and the rotor 3 are provided. In this example, the rotating electrical machine 1 is a synchronous motor.

  As shown in FIG. 2, bearings 5 are provided at both ends in the axial direction of the frame 4. The rotor 3 is rotatably supported by the frame 4 via each bearing 5. The stator 2 is fixed to the inner peripheral surface of the frame 4.

  The stator 2 is arranged coaxially with the rotor 3. The stator 2 includes a stator core 11 facing the rotor 3 with a gap in the radial direction of the rotor 3, and a plurality of fixings arranged on the stator core 11 and arranged in the circumferential direction of the stator core 11. And a child coil 12.

  As shown in FIG. 1, the stator core 11 protrudes from the core back 13 surrounding the rotor 3 and the core back 13 toward the rotor 3 (that is, radially inward), and in the circumferential direction. And a plurality of teeth 14 spaced apart from each other. Between each of the teeth 14, a slot 15 opened toward the rotor 3 is formed. Each stator coil 12 is individually wound around each tooth 14. A stator coil 12 is disposed in each slot 15. A stator magnetic pole is formed on each tooth 14 by feeding power to each stator coil 12.

  The rotor 3 includes a rotating shaft 21 disposed on the axis of the rotating electrical machine 1, a pair of end plates 22 (FIG. 2) disposed apart from each other in the axial direction and fixed to the rotating shaft 21, and a rotating shaft. A plurality of magnetic members (rotor cores) 23 arranged in the circumferential direction between 21 and the stator 2 and provided between the end plates 22, respectively, and a plurality of magnetic members 23 held between the magnetic members 23 in the circumferential direction Permanent magnets 24 and a plurality of connecting members 25 that individually connect each of the magnetic members 23 and the rotating shaft 21.

  The rotating shaft 21 includes a columnar shaft main body portion 26 that penetrates both ends in the axial direction of the frame 4, and a shaft cylindrical portion 27 that is fixed to the shaft main body portion 26 so as to surround the outer periphery of the shaft main body portion 26. Have. The shaft main body 26 and the shaft cylindrical portion 27 are made of a magnetic material (for example, iron). In this example, each of the shaft main body portion 26 and the shaft tubular portion 27 is manufactured by processing a single material.

  The shaft main body 26 is disposed on the axis of the rotating shaft 21. Further, the shaft main body portion 26 is fitted on the inner peripheral surface of the shaft cylindrical portion 27 without a gap. The length of the shaft main body portion 26 is longer than the length of the shaft tubular portion 27. As shown in FIG. 2, the pair of bearings 5 are respectively fitted into portions protruding from the shaft cylindrical portion 27 of the shaft main body portion 26. The rotating shaft 21 is rotatably supported by the frame 4 via the bearing 5 in a state where the shaft main body portion 26 is penetrated at both axial ends of the frame 4.

  The shaft tubular portion 27 is disposed in the frame 4. Further, the shaft cylindrical portion 27 is fixed to the shaft main body portion 26 with a strength that can withstand the torque applied to the rotor 3 by, for example, shrink fitting, press fitting, or fitting between a key and a key groove.

  As shown in FIG. 2, the end plates 22 are arranged apart from each other with the axial cylindrical portion 27 in between in the axial direction of the rotating shaft 21. As shown in FIG. 3, a shaft through hole 28 through which the shaft main body portion 26 passes is provided at the center of each end plate 22. Each end plate 22 is fixed to the rotating shaft 21 with the shaft main body portion 26 fitted in the shaft through hole 28. As a method for fixing each end plate 22 to the rotating shaft 21, for example, press fitting of the shaft main body portion 26 into the shaft through hole 28 can be cited. Thereby, each end plate 22 is fixed to the shaft main body portion 26. In this example, the shape of each end plate 22 is a disc shape.

  As shown in FIG. 1, each magnetic member 23 is disposed away from each of the shaft tubular portion 27 and the stator 2. Each magnetic member 23 is disposed along the axis of the rotor 3. Each magnetic member 23 is a laminated body configured by laminating a plurality of thin plates (in this example, steel plates) in the axial direction of the rotor 3. The cross-sectional dimension of each magnetic member 23 in the circumferential direction of the rotor 3 continuously decreases from the radially outer side (stator 2 side) of the rotor 3 toward the radially inner side (rotary shaft 21 side). Yes. The cross-sectional shape of each magnetic member 23 is the same at any position in the axial direction of the rotor 3.

  As shown in FIG. 2, each magnetic member 23 is integrated with a pair of end plates 22 by fastening a plurality of fastening means 30. Thus, one end of each magnetic member 23 is fixed to one end plate 22, and the other end of each magnetic member 23 is fixed to the other end plate 22. Each fastening means 30 is screwed into a support rod (screw rod) 31 penetrating the magnetic member 23 and penetrating each end plate 22, and both ends of the support rod 31, respectively. And a pair of nuts 32 for fastening 23 together from both sides.

  As shown in FIG. 1, each permanent magnet 24 is individually sandwiched between two magnetic members 23 adjacent to each other in the circumferential direction and sandwiched between a pair of end plates 22 in the axial direction. It is arrange | positioned along the axial direction. The permanent magnets 24 are held between the magnetic members 23 in contact with the respective side surfaces of the magnetic members 23 located on both sides in the circumferential direction of the permanent magnets 24. A space exists between each magnetic member 23 and each permanent magnet 24 and the shaft cylindrical portion 27.

  Each permanent magnet 24 is arranged radially about the axis of the rotor 3 such that the dimension of the rotor 3 in the radial direction is longer than the dimension of the rotor 3 in the circumferential direction. That is, the method of embedding the permanent magnet 24 in the rotor 3 is a vertically embedded type (spoke type). In this example, the cross-sectional shape of each permanent magnet 24 is rectangular, and each permanent magnet 24 is arranged such that the long side of the rectangular shape coincides with the radial direction of the rotor 3.

  Magnet holding members 33 for preventing the permanent magnets 24 from jumping out between the magnetic members 23 are arranged at positions on the stator 2 side of the permanent magnets 24 (that is, radially outside of the permanent magnets 24). Yes. Each magnet holding member 33 is disposed along the axial direction of the rotor 3. On both side surfaces of each magnetic member 23, notched grooves 34 into which the side portions of the magnet holding members 33 are fitted are provided along the axial direction of the rotor 3. Each magnet holding member 33 is held between the magnetic members 23 by fitting both sides into two cutout grooves 34 provided in the magnetic members 23 on both sides. Generally, each magnet holding member 33 is a non-magnetic material such as FRP (Fiber Reinforced Plastic).

  A first dovetail groove (first engagement groove) 35 is provided along the axial direction of the rotor 3 on the surface of each magnetic member 23 on the rotating shaft 21 side (that is, the inner peripheral surface of each magnetic member 23). Each is provided. A plurality of second dovetail grooves (second engagement grooves) 36 are provided on the outer peripheral surface of the shaft cylindrical portion 27 at intervals in the circumferential direction. Each second dovetail groove 36 individually opposes the first dovetail groove 35 in each magnetic member 23 in the radial direction. The depth direction of each of the first and second dovetail grooves 35, 36 coincides with the radial direction of the rotor 3. The first and second dovetail grooves 35 and 36 are grooves whose width dimension continuously increases toward the bottom surface of the groove. In this example, the cross-sectional shape of the first and second dovetail grooves 35 and 36 is substantially triangular.

  The connecting members 25 are arranged away from each other in the circumferential direction of the rotor 3 according to the positions of the magnetic members 23. In this example, the connecting members 25 are arranged at equal intervals in the circumferential direction of the rotor 3. In addition, each connecting member 25 is arranged along the axial direction of the rotor 3.

  Each connecting member 25 includes a first engagement portion 25a that fits in the first dovetail groove 35, a second engagement portion 25b that fits in the second dovetail groove 36, the first engagement portion 25a, and the second engagement portion 25a. And a connecting portion 25c that connects the engaging portions 25b. The cross-sectional shape of the first engaging portion 25 a is a cross-sectional shape that matches the cross-sectional shape of the first dovetail groove 35. The cross-sectional shape of the second engagement portion 25 b is a cross-sectional shape that matches the cross-sectional shape of the second dovetail groove 36. Thereby, each width dimension of the 1st and 2nd engaging part 25a, 25b is narrowed continuously toward the coupling | bond part 25c. The cross-sectional shape of the connecting member 25 is the same at any position in the axial direction of the rotor 3. In this example, the width dimensions of the first and second engaging portions 25a and 25b are the same.

  Each connecting member 25 has the first engaging portion 25a fitted in the first dovetail groove 35 and the second engaging portion 25b fitted in the second dovetail groove 36, whereby the radial direction of the rotor 3 and In any of the circumferential directions, the magnetic member 23 and the shaft tubular portion 27 are engaged with each other. Each connecting member 25 is in a state in which the first engaging portion 25a is engaged with the inner surface of the first dovetail groove 35 and the second engaging portion 25b is engaged with the inner surface of the second dovetail groove 36. Thus, it is connected between the magnetic member 23 and the shaft cylindrical portion 27. Thereby, each magnetic member 23 and each permanent magnet 24 are held with respect to the rotating shaft 21 with a strength that can withstand the centrifugal force of the rotor 3.

  Each connecting member 25 is a nonmagnetic material. As a material of each connecting member 25, for example, SUS304 having a high elastic modulus is used. When an iron-based material is used as the material of the connecting member 25, the coefficient of thermal expansion of the connecting member 25 is higher than that of the magnetic member 23 and the rotary shaft 21 as compared with the case where an alloy such as aluminum or copper is used as the connecting member 25. Since it becomes a value close | similar to a thermal expansion coefficient, generation | occurrence | production of the thermal stress and the thermal distortion in the rotor 3 is suppressed.

  The length of each connecting member 25 is longer than the length of each of the shaft tubular portion 27 and each magnetic member 23. As shown in FIGS. 2 and 3, each end plate 22 is provided with a plurality of fitting holes 37 into which the connecting members 25 are individually fitted. In this example, the fitting holes 37 are provided at equal intervals in the circumferential direction. In this example, the radially inner portion of each fitting hole 37 is opened in the shaft through hole 28. One end of the connecting member 25 is fitted in the fitting hole 37 of one end plate 22, and the other end of the connecting member 25 is fitted in the fitting hole 37 of the other end plate 22.

  On the inner surface of each fitting hole 37, a radial engagement surface 37 a that engages with the connecting member 25 on the radially outer side of the connecting member 25, and a pair of circumferences that engage with the connecting member 25 in the circumferential direction of the connecting member 25. A direction engaging surface 37b is provided. In this example, the circumferential engagement surface 37b is a surface along the radial direction, and the radial engagement surface 37a is a surface perpendicular to the circumferential engagement surface 37b. The distances between the respective radial engagement surfaces 37a and the axis of the rotor 3 are all the same. In a state where the connecting member 25 is fitted in the fitting hole 37, the connecting member 25 is engaged with the radial engagement surface 37a, so that the displacement of the connecting member 25 in the radial direction with respect to the end plate 22 is restricted. When the material 25 engages with the pair of circumferential engagement surfaces 37b, displacement of the connecting material 25 in the circumferential direction with respect to the end plate 22 is restricted.

  FIG. 4 is a sectional view showing the rotor 3 of FIG. 1 together with the magnetization directions of the permanent magnets 24. FIG. 5 is an enlarged sectional view showing a part of the rotor 3 of FIG. 4 together with the flow of magnetic flux by each permanent magnet 24. 4 and 5, the magnetization direction of each permanent magnet 24 is indicated by an arrow A. As shown in FIGS. 4 and 5, each permanent magnet 24 is arranged with the same pole facing the common magnetic member 23 in the circumferential direction of the rotor 3.

  The magnetic flux generated by each permanent magnet 24 is distributed in the direction indicated by the arrow B (thin line arrow) in FIG. That is, among the two magnetic members 23 adjacent to each other in the circumferential direction, the magnetic flux generated by the permanent magnet 24 passes from the side surface of the magnetic member 23 toward the outer peripheral surface of the magnetic member 23 on the one hand, and on the other hand by the permanent magnet 24. Magnetic flux passes from the outer peripheral surface of the magnetic member 23 toward the side surface of the magnetic member 23. The magnetic flux generated by each permanent magnet 24 passes through the magnetic member 23 and the stator core 11 so as to form a loop between each magnetic member 23 and the stator core 11. Thus, a rotor magnetic pole is formed on each magnetic member 23.

  Here, FIG. 6 is an enlarged cross-sectional view showing the rotor 3 when each connecting member 25 of FIG. 5 is a magnetic body. When each connecting member 25 is a magnetic body, a part of the magnetic flux generated by the permanent magnet 24 passes through the loop passing through the connecting member 25 and the shaft tubular portion 27 as shown by an arrow C (broken arrow) in FIG. Form. Thereby, when each connection material 25 is a magnetic body, the magnetic flux which passes the connection material 25 among the magnetic flux by each permanent magnet 24 will not couple | bond with the stator 2, and the efficiency of the rotary electric machine 1 will fall. The amount of magnetic flux passing through each connecting member 25 increases as the magnetic permeability of the connecting member 25 increases, and adversely affects the characteristics of the rotating electrical machine 1. Accordingly, each connecting member 25 is preferably a non-magnetic material.

  Next, a method for assembling the rotor 3 will be described. First, the rotating shaft 21 is prepared by fixing the shaft cylindrical portion 27 to the shaft main body portion 26 by, for example, press fitting. Thereafter, in a state where the magnetic members 23 and the permanent magnets 24 are alternately arranged around the axial cylindrical portion 27 in the circumferential direction, the first engaging portion 25a is placed in the first dovetail groove 35 along the axial direction. By inserting and inserting the second engaging portion 25b into the second dovetail groove 36 along the axial direction, each magnetic member 23 and the shaft tubular portion 27 are individually connected by the connecting member 25. To do. Further, the magnet holding member 33 is inserted along the axial direction between the notch grooves 34 of the magnetic members 23 adjacent to each other, and the magnet holding member 33 is held at a position radially outside the permanent magnet 24.

  Thereafter, the shaft through holes 28 of the end plate 22 are fitted into the shaft main body 26 from both sides in the axial direction of the rotary shaft 21 by, for example, press fitting, and the end plates 22 are fixed to the rotary shaft 21. At this time, the axial ends of the connecting members 25 are individually fitted into the fitting holes 37 of the end plate 22. Thereafter, the support rod 31 is passed through the one end plate 22, the magnetic member 23, and the other end plate 22 in this order, and each end plate 22 and the magnetic member 23 are engaged with a pair of nuts 32 screwed into both ends of the support rod 31. Tighten together. In this way, the rotor 3 is assembled.

  Here, in a state where the rotor 3 is completed, there is a minute gap between each part of the magnetic member 23, the permanent magnet 24, the connecting member 25, the shaft cylindrical part 27, or between any of the parts. Yes. When the rotor 3 is completed and designed so that there is no minute gap between any of the parts, for example, there is a minute foreign matter between the parts, or a processing error occurs in at least one of the parts. If this is done, there is a risk that any part will not enter at the end of assembly of the rotor 3. Therefore, each part of the rotor 3 is designed and manufactured so that a minute gap is generated between any of the parts when the rotor 3 is completed. If a minute gap is generated between the components of the rotor 3 in a state where the rotor 3 is completed, each of the magnetic member 23, the permanent magnet 24, and the connecting member 25 is designed with respect to the rotating shaft 21 (coaxial). Position).

  FIG. 7 is an enlarged cross-sectional view illustrating a state in which the positions of the magnetic member 23 and the connecting member 25 are shifted with respect to the rotation shaft 21 when the rotor 3 of FIG. 1 is assembled. In FIG. 7, the width dimension L1 (peripheral dimension of the permanent magnet 24a) L1 of the permanent magnet 24a existing between the two adjacent magnetic members 23a and 23b is larger than the width dimension L2 of the other permanent magnets 24. The state that has been formed is shown. In FIG. 7, when the rotor 3 is assembled, the minute foreign matter 38 is sandwiched between the permanent magnet 24 existing on the left side of the magnetic member 23 a (the side opposite to the permanent magnet 24 a having a large width). The state is shown.

  As shown in FIG. 7, when a minute foreign object 38 is sandwiched between the magnetic member 23a and the permanent magnet 24, the width dimension L1 of the permanent magnet 24a is larger than the width dimension L2 of the other permanent magnets 24. Each of the magnetic member 23a and the magnetic member 23b cannot be inserted to the normal design position, and the outer peripheral portion of the magnetic member 23a protrudes radially outward as compared with the magnetic member 23 existing at the other normal design position. ing. Thereby, each connecting member 25 connected to each of the magnetic members 23a and 23b is also shifted from the normal design position to the outside in the radial direction due to the presence of a minute gap between each of the dovetail grooves 35 and 36.

  In FIG. 7, in order to make this state easy to understand, a first reference line X based on the design position of the magnetic member 23 and a second reference line Y based on the design position of the connecting member 25 are shown. Note that FIG. 7 shows a state in which the positions of the magnetic members 23a and 23b are greatly displaced and a state in which the width dimension of the permanent magnet 24a is greatly increased in order to make the state easy to understand. The amount of deviation is very small.

  In the present embodiment, the positions of the connecting members 25 are restricted in the radial direction and the circumferential direction by fitting the connecting members 25 into the fitting holes 37 of the end plates 22. As a result, in the present embodiment, when the rotor 3 is assembled, the minute foreign matter 38 is sandwiched between the magnetic member 23a and the permanent magnet 24, or there is an error in the dimensions of the permanent magnet 24a. Even so, the displacement of each position of each connecting member 25 and each magnetic member 23 is less likely to occur in the radial direction and the circumferential direction.

  Moreover, in this Embodiment, since the magnetic member 23 is connected with the connection material 25 only in one place, the attachment error of the magnetic member 23 with respect to the axial cylindrical part 27 becomes small. Therefore, when the position of each connecting member 25 is restricted to the normal position by the fitting hole 37, the coaxial state between the rotating shaft 21 and each magnetic member 23 is ensured. In addition, the rotation shaft is obtained by making the fitting between the shaft through hole 28 of each end plate 22 and the shaft main body portion 26 and between the fitting hole 37 of each end plate 22 and the connecting member 25 into an interference fit. The coaxiality between 21 and each magnetic member 23 is further increased.

  In such a rotating electrical machine 1, each magnetic member 23 and the rotating shaft 21 are individually connected by a plurality of connecting members 25, and a plurality of fitting holes 37 into which each connecting member 25 is individually fitted are provided on the rotating shaft 21. Since each end plate 22 is provided on each end plate 22, the position of each connecting member 25 with respect to the rotary shaft 21 can be regulated in the radial direction and the circumferential direction by each end plate 22. The position of 23 can also be regulated in the radial direction and the circumferential direction. Thereby, each coaxiality of each magnetic member 23 with respect to the rotating shaft 21 can be increased, and the deterioration of the characteristics of the rotating electrical machine 1 (for example, the effect of suppressing vibration and noise during the operation of the rotating electrical machine 1) can be suppressed. Can do. Further, even if a space is created between each of the magnetic members 23 and the rotation shaft 21 by regulating the position of the connecting member 25 by each end plate 22, the position of each magnetic member 23 with respect to the rotation shaft 21 is stabilized. be able to. Thereby, the usage-amount of the material of each connection material 25 can be reduced, and reduction of cost can be aimed at.

  In particular, when each connecting member 25 is a non-magnetic material, the material of each connecting member 25 is an expensive material such as stainless steel. Therefore, in this case, it is possible to increase the cost reduction effect due to the reduction in the amount of material used for each connecting member 25.

  In addition, each connecting member 25 engages the first engagement portion 25 a with the inner surface of the first dovetail groove 35 of the magnetic member 23, and the second engagement portion 25 b becomes the second dovetail groove of the rotating shaft 21. Since it is connected between the magnetic member 23 and the rotating shaft 21 while being engaged with the inner surface of 36, it is not necessary to connect the connecting members 25 to the magnetic member 23 and the rotating shaft 21, respectively, by welding or the like. Etc. can reduce the capital investment.

  The rotating shaft 21 has a shaft main body portion 26 and a shaft cylindrical portion 27 fixed to the shaft main body portion 26 so as to surround the outer periphery of the shaft main body portion 26, and each connecting member 25 is a shaft cylindrical shape. Since it is connected to the portion 27, the rotary shaft 21 having a complicated shape can be produced by combining the shaft main body portion 26 and the shaft tubular portion 27 which are separate members having simple shapes. Thereby, compared with the case where the rotating shaft 21 is produced from a single material by machining, the rotating shaft 21 can be easily produced, and the manufacturing cost of the rotating electrical machine 1 can be further reduced.

Embodiment 2. FIG.
In the first embodiment, the inner diameter side end of each fitting hole 37 is opened to the shaft through hole 28, but the partition that separates each fitting hole 37 from the shaft through hole 28 is an outer periphery of the shaft main body 26. You may provide in a part.

  8 is a cross-sectional view showing a rotor 3 of a rotating electrical machine according to Embodiment 2 of the present invention. FIG. 8 is a cross-sectional view corresponding to FIG. 3 in the first embodiment. Each end plate 22 is provided with a plurality of partition portions 40 that partition between the shaft through hole 28 and each fitting hole 37. Each partition portion 40 is formed along the outer peripheral surface of the shaft main body portion 26. In addition, each partition 40 is connected integrally with the end plate 22 between the pair of circumferential engagement surfaces 37 b of the fitting hole 37. Thereby, each fitting hole 37 is a closed hole. Other configurations are the same as those in the first embodiment.

  In such a rotating electrical machine 1, since the plurality of partition portions 40 that partition between the shaft through hole 28 and each fitting hole 37 are provided in each end plate 22, the rigidity of the end plate 22 can be increased. . Thereby, the coaxiality of each magnetic member 23 and each connecting member 25 with respect to the rotating shaft 21 can be increased.

Embodiment 3 FIG.
You may make the dimension of the connection material 25 larger than Embodiment 1 about the radial direction of the rotor 3. FIG.

  9 is a cross-sectional view showing a rotor 3 of a rotating electrical machine according to Embodiment 3 of the present invention. 9 is a cross-sectional view corresponding to FIG. 3 in the first embodiment. The dimension of each connecting member 25 is larger than that of the connecting member 25 in the first embodiment in the radial direction of the rotor 3. The depth dimension of the second dovetail groove 36 is a dimension that fits not only the second engaging portion 25b of the connecting member 25 but also a part of the coupling portion 25c. That is, the depth dimension of the second dovetail groove 36 is larger than the depth dimension of the second dovetail groove 36 in the first embodiment. Other configurations are the same as those in the first embodiment.

  In such a rotating electrical machine 1, the depth of the second dovetail groove 36 is such that not only the second engaging portion 25 b of the connecting member 25 but also a part of the coupling portion 25 c is fitted. The dimension of the connecting member 25 can be increased in the radial direction of the rotor 3. Thereby, the cross-sectional secondary moment of each connecting member 25 in the radial direction of the rotor 3 can be improved, and the coaxiality of each magnetic member 23 with respect to the rotating shaft 21 can be further improved.

Embodiment 4 FIG.
The connecting member 25 may be fixed to the end plate 22 by welding.

  10 is a longitudinal sectional view showing a rotor 3 of a rotating electrical machine according to Embodiment 4 of the present invention. FIG. 10 is a cross-sectional view corresponding to the rotor 3 of FIG. 2 in the first embodiment. Each end plate 22 is fixed with each connecting member 25 by joining the inner surface of the fitting hole 37 and the connecting member 25 by welding. A welded portion 41 is formed at the boundary between the inner surface of the fitting hole 37 and the connecting member 25. In this example, a welded portion 41 is formed at the boundary between the radial engagement surface 37 a of the fitting hole 37 and the connecting member 25. Other configurations are the same as those in the first embodiment.

  Thus, since the connecting member 25 is fixed to the end plate 22 by welding, the position of the connecting member 25 is determined not only in the radial direction and the circumferential direction of the rotor 3 but also in the axial direction of the rotor 3. 22 can be fixed. Thereby, the shift | offset | difference of the position of each connection material 25 and each magnetic member 23 can further be prevented, and suppression of the fall of the characteristic of the rotary electric machine 1 can further be aimed at.

  In the above example, the connecting member 25 is fixed to the inner surface of the fitting hole 37 provided in each end plate 22 by welding, but the fitting provided in either one of the end plates 22. You may fix to the inner surface of the hole 37 only by welding.

  In the above example, the connecting member 25 is fixed to the radial engagement surface 37 a of the fitting hole 37 by welding, but the connecting member 25 is fixed to the circumferential engaging surface 37 b of the fitting hole 37 by welding. May be.

Embodiment 5 FIG.
FIG. 11 is a cross-sectional view showing a rotor 3 of a rotating electrical machine according to Embodiment 5 of the present invention. FIG. 12 is a perspective view showing the connecting member 25 of FIG. FIG. 11 is a cross-sectional view corresponding to FIG. 3 in the first embodiment. As shown in FIG. 12, each connecting member 25 protrudes from the connecting member main body 42 to the both sides in the axial direction, and a part of the cross section of the connecting member main body 42 is removed. And a pair of fitting protrusions 43 having a cross section.

  In this example, a rectangular shape formed by removing a part of the second engaging portion 25b and the first engaging portion 25a out of the cross-sectional shape of the connecting material main body 42 is a fitting protrusion. The section 43 has a cross-sectional shape. Thereby, in this example, the maximum dimension of each fitting protrusion 43 is smaller in both the radial direction and the circumferential direction of the rotor 3 than the maximum dimension of the connecting member main body 42. Furthermore, in this example, the fitting protrusion 43 engages with the radial engagement surface 37 a in the radial direction of the rotor 3 and engages with the pair of circumferential engagement surfaces 37 b in the circumferential direction of the rotor 3. In this state, it is fitted in the fitting hole 37.

  At the boundary between each of the fitting protrusions 43 and the connecting material main body 42, the end face 42a of the connecting material main body 42 is exposed. Thereby, a stepped portion is formed at the boundary between each of the fitting protrusions 43 and the connecting material main body 42. Each end plate 22 is engaged with an end surface 42 a of the connecting member main body 42 exposed at the boundary between each fitting protrusion 43 and the connecting member main body 42 in the axial direction of the rotor 3. Thereby, the position of each connecting member 25 with respect to each end plate 22 is restricted in the axial direction of the rotor 3. Other configurations are the same as those in the first embodiment.

  In such a rotating electrical machine 1, the fitting protrusion 43 having a cross section obtained by removing a part of the cross section of the connecting material main body 42 protrudes from the connecting material main body 42 in the axial direction, and the fitting protruding portion 43 enters the fitting hole 37. Since the end face 42a of the connecting material main body 42 is engaged with the end plate 22 in the axial direction, the connecting material 25 is easily prevented from shifting in the axial direction of the rotor 3 with respect to the end plate 22. be able to. Thereby, it is not necessary to fix the connecting member 25 to the end plate 22 by welding or the like, and it is possible to reduce the capital investment of the welding apparatus or the like and to further reduce the manufacturing cost.

Embodiment 6 FIG.
FIG. 13 is a cross-sectional view showing a rotor 3 of a rotating electrical machine according to Embodiment 6 of the present invention. FIG. 14 is a perspective view showing a main part of the connecting member 25 of FIG. Further, FIG. 15 is a front view showing a state when the connecting member 25 of FIG. 14 is viewed along the axial direction of the rotor 3. FIG. 13 is a cross-sectional view corresponding to FIG. 3 in the first embodiment. As shown in FIG. 14, each connecting member 25 protrudes from the connecting member main body 42 to both sides in the axial direction, and a part of the cross section of the connecting member main body 42 is removed. And a pair of fitting protrusions 43 having a cross section.

  In this example, as shown in FIG. 15, in the connecting member main body 42, the width dimension of the second engagement portion 25b is larger than the width dimension of the first engagement portion 25a. Further, in this example, among the cross-sectional shape of the connecting material main body 42, the shape in which only both end portions in the width direction of the second engagement portion 25b are removed in accordance with the width dimension of the first engagement portion 25a, The cross-sectional shape of the fitting protrusion 43 is obtained. Thereby, in this example, the maximum dimension of each fitting protrusion 43 in the circumferential direction of the rotor 3 is smaller than the maximum dimension of the connecting member main body 42 in the circumferential direction of the rotor 3. Furthermore, in this example, the fitting protrusion 43 engages with the radial engagement surface 37 a in the radial direction of the rotor 3 and engages with the pair of circumferential engagement surfaces 37 b in the circumferential direction of the rotor 3. In this state, it is fitted in the fitting hole 37.

  At the boundary between each of the fitting protrusions 43 and the connecting material main body 42, the end face 42a of the connecting material main body 42 is exposed at the positions of both end portions in the width direction of the second engaging portion 25b. Thereby, a stepped portion is formed at the boundary between each of the fitting protrusions 43 and the connecting material main body 42. Each end plate 22 is engaged with an end surface 42 a of the connecting member main body 42 exposed at the boundary between each fitting protrusion 43 and the connecting member main body 42 in the axial direction of the rotor 3. Thereby, the position of each connecting member 25 with respect to each end plate 22 is restricted in the axial direction of the rotor 3. Other configurations are the same as those in the first embodiment.

  In this way, in the connecting material main body 42, the width dimension of the second engaging portion 25b is made larger than the width dimension of the first engaging portion 25a, and the second engaging portion of the cross-sectional shape of the connecting material main body 42 is used. The end surface 42a of the connecting material main body 42 can be exposed at the boundary with the fitting protrusion 43 by making the shape obtained by removing both end portions in the width direction of the portion 25b into the cross-sectional shape of each fitting protrusion 43. The end surface 42a of the connecting member main body 42 can be engaged with the end plate 22 in the axial direction in a state where the fitting protrusion 43 is fitted in the fitting hole 37. Thereby, it can prevent easily that the connection material 25 shifts | deviates to the axial direction of the rotor 3 with respect to the end plate 22, and can further aim at reduction of manufacturing cost.

  In the above example, the width of the second engaging portion 25b in the connecting member main body 42 is larger than the width of the first engaging portion 25a. The width dimension of the joint portion 25a may be larger than the second width dimension. In this case, the cross-sectional shape of each fitting protrusion 43 is a shape obtained by removing both end portions in the width direction of the first engaging portion 25a from the cross-sectional shape of the connecting material main body 42.

Embodiment 7 FIG.
FIG. 16 is a perspective view showing a rotating shaft 21 of a rotating electrical machine according to Embodiment 7 of the present invention. As shown in FIG. 16, the shaft cylindrical portion 27 is a laminated body configured by stacking a plurality of annular thin plates 27 a in the axial direction of the rotating shaft 21. Each annular thin plate 27a is formed by a punching process in which a steel plate is punched with a punching die. The annular thin plates 27a are integrated by plastically deforming and crimping the annular thin plates 27a. The shaft cylindrical portion 27 is fixed to the shaft main body portion 26 with a strength that can withstand the torque applied to the rotor 3 by, for example, shrink fitting, press fitting, or fitting between a key and a key groove. Other configurations are the same as those in the first embodiment.

  Thus, since the axial cylindrical part 27 is a laminated body formed by stacking a plurality of annular thin plates 27a in the axial direction of the rotating shaft 21, the annular thin plate 27a can be easily formed by punching the plate. Compared with the case where the shaft cylindrical portion 27 is formed by machining from a single material (that is, when the shaft cylindrical portion 27 is a single body), the shaft cylindrical portion 27 can be easily manufactured. Thereby, the manufacturing cost of the rotary electric machine 1 can be further reduced.

  In the above example, each annular thin plate 27a is only caulked, but in addition to caulking each annular thin plate 27a, a plurality of annular thin plates 27a are stacked in the axial direction of the rotating shaft 21. A pair of fixing plates that sandwich the body from both sides may be fixed to the shaft main body portion 26. In this case, the thickness dimension of the pair of fixed plates is made larger than the thickness dimension of each annular thin plate 27a. In this case, each fixing plate is firmly fixed to the shaft main body 26 by, for example, press fitting. Furthermore, in this case, the cross-sectional shape of each fixed plate is the same as the cross-sectional shape of each annular thin plate 27a. In this way, the shape of the shaft cylindrical portion 27 can be further stabilized.

  In the above example, a laminated body in which a plurality of annular thin plates 27a are stacked is applied to the shaft tubular portion 27 of the first embodiment, but a laminated body in which a plurality of annular thin plates 27a are stacked is used in the second embodiment. You may apply to the shaft cylindrical part 27 of ~ 6.

  Moreover, in each said embodiment, although each connection material 25 is a nonmagnetic body, it is good also considering each connection material 25 as a magnetic body. In this case, if the shaft cylindrical portion 27 is made of a non-magnetic material, the magnetic flux generated by the permanent magnet 24 becomes difficult to pass through each connecting member 25, and an increase in the leakage magnetic flux amount in the rotor 3 can be suppressed.

  In each of the above embodiments, as shown in FIG. 1, the number of permanent magnets 24 (number of poles) is 10 and the number of slots 15 of the stator 2 is 12, and the poles of the rotor 3 are The ratio of the number of slots to the number of slots 15 of the stator 2 is 5: 6, but other combinations of the number of poles of the rotor 3 and the number of slots 15 of the stator 2 may be used. .

  Moreover, in each said embodiment, although the structure of the rotating shaft 21 becomes the structure which fitted the shaft cylindrical part 27 and fixed to the shaft main-body part 26, the rotating shaft 21 is a single material (integral thing). It may be configured. In this case, each second dovetail groove 36 is provided on the outer peripheral surface of the portion of the rotating shaft 21 having a large outer diameter corresponding to the shaft tubular portion 27.

  Moreover, in each said embodiment, although the cross-sectional shape of the 1st dovetail groove | channel (1st engagement groove | channel) 35 in which the 1st engaging part 25a fits is substantially triangular shape, it is 1st engagement. If the portion 25a is engaged with the inner surface of the first dovetail groove 35 in the radial direction and circumferential direction of the rotor 3, the cross-sectional shape of the first dovetail groove (first engagement groove) 35 is It is not limited.

  Moreover, in each said embodiment, although the cross-sectional shape of the 2nd dovetail groove | channel (2nd engagement groove) 36 in which the 2nd engaging part 25b fits is substantially triangular shape, it is 2nd engagement. If the portion 25b is engaged with the inner surface of the second dovetail groove 36 in the radial direction and circumferential direction of the rotor 3, the sectional shape of the second dovetail groove (second engagement groove) 36 is It is not limited.

  Various modifications can be made in the practice of the present invention. Further, all the features of each of the above embodiments can be used in combination or selectively.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine (permanent magnet type rotating electrical machine) 2 Stator 3 Rotator 21 Rotating shaft 22 End plate 23 Magnetic member 24 Permanent magnet 25 Connection material 25a First engaging portion 25b Second Engagement portion, 26 shaft main body portion, 27 shaft cylindrical portion, 27a annular thin plate (thin plate), 35 first dovetail groove (first engagement groove), 36 second dovetail groove (second engagement) Groove), 37 fitting hole, 42 coupling material main body, 42a end face, 43 fitting protrusion.

Claims (6)

A permanent magnet type rotating electrical machine comprising a cylindrical stator, and a rotor arranged inside the stator and rotated with respect to the stator about an axis,
The rotor is
A rotation axis disposed on the axis;
A pair of end plates arranged apart from each other in the axial direction and fixed to the rotating shaft;
A plurality of magnetic members arranged between the rotating shaft and the stator in a circumferential direction in a state separated from the rotating shaft and the stator, and provided between the end plates;
A plurality of permanent magnets held between the magnetic members in the circumferential direction;
A plurality of connecting members for individually connecting each of the magnetic members and the rotating shaft;
A permanent magnet type rotating electric machine in which each of the end plates is provided with a plurality of fitting holes into which the connecting members are individually fitted.   The permanent magnet type rotating electrical machine according to claim 1, wherein each of the connecting members is fixed to the end plate by welding. Each of the connecting members includes a connecting member main body disposed between the end plates, a fitting protrusion having a cross section protruding from the connecting member main body in an axial direction, and removing a part of a cross section of the connecting member main body, Have
The fitting protrusion is fitted in the fitting hole,
3. The permanent plate according to claim 1, wherein an end surface of the connecting material body exposed at a boundary between the connecting material body and the fitting protrusion is engaged with the end plate in the axial direction. Magnet rotating electric machine. Each of the magnetic members is provided with a first engagement groove,
The rotating shaft is provided with a plurality of second engaging grooves spaced apart from each other in the circumferential direction,
Each of the connecting members has a first engagement portion that fits in the first engagement groove, and a second engagement portion that fits in the second engagement groove.
Each of the coupling members engages the first engagement portion with the inner surface of the first engagement groove and engages the second engagement portion with the inner surface of the second engagement groove. The permanent magnet type rotating electrical machine according to any one of claims 1 to 3, wherein the permanent magnet type rotating electrical machine is connected between the magnetic member and the rotating shaft in a state where the rotating member is in a closed state. The rotating shaft has a shaft main body portion, and a shaft cylindrical portion fixed to the shaft main body portion in a state of surrounding the outer periphery of the shaft main body portion,
The permanent magnet type rotating electrical machine according to any one of claims 1 to 4, wherein each of the connecting members is connected to the shaft cylindrical portion.   The permanent magnet type rotating electrical machine according to claim 5, wherein the axial cylindrical portion is a laminated body configured by stacking a plurality of thin plates in the axial direction.

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