JP6112970B2 - Permanent magnet rotating electric machine - Google Patents

Description

  The present invention relates to a permanent magnet type rotating electrical machine using a permanent magnet, and more particularly to a permanent magnet type rotating electrical machine that achieves higher speed and higher torque of the rotating electrical machine.

  In rotating electric machines such as industrial motors, electric cars, and hybrid cars, rotating electric machines using permanent magnets are used for miniaturization and high output. Such a permanent magnet type rotating electrical machine does not require external field energy, and thus can be miniaturized. Further, in the permanent magnet type rotating electric machine, when trying to further increase the output, the permanent magnet is not only near the surface of the rotor formed by laminating magnetic members such as electromagnetic steel plates, but also on the inner diameter side of the rotor. May be arranged radially.

At this time, if the permanent magnets are arranged radially, the magnetic flux leaks on the inner diameter side of the rotor, and there is a problem that the effective amount of magnetic flux contributing to the torque is reduced. In order to reduce the leakage of the magnetic flux, the rotor core is divided in the circumferential direction, and the core and the permanent magnet are arranged in the circumferential direction, thereby providing a gap on the rotor inner diameter side. Further, a permanent magnet type electric motor is conceivable in which a pin is passed through the divided core piece, and the end plate at the end in the core axial direction is coupled to the pin.
However, because the rotor core is divided, it is necessary to strengthen the pin to be coupled to meet the demand for high speed, and the pin prevents the magnetic flux from the permanent magnet, resulting in an effective magnetic flux. There is a problem that decreases. Further, since the core has low rigidity, there is a problem that stress is concentrated on the permanent magnet and the permanent magnet is damaged.

As an example of a technique for solving these problems, in a rotor configured by stacking rotor cores integrated in the circumferential direction, permanent magnets arranged radially on the rotor core have long sides positioned on the shaft side and the rotor core. A trapezoidal shape consisting of a short side located on the outer circumference side and a side that is not parallel to each other, a part of the rotor core adjacent to the long side of the permanent magnet is cut away to form an air gap, and the non-magnetic inside the air gap A technique in which materials (resins and the like) are arranged has been proposed (see Patent Document 1).
By adopting such a configuration, it is possible to ensure the mechanical strength while reducing the leakage magnetic flux of the rotor inner diameter.

JP 2010-4722 (paragraph 0030, FIG. 6, FIG. 7)

  In Patent Document 1, in order to reduce leakage magnetic flux on the rotor inner diameter side, an air gap or a nonmagnetic material (resin or the like) is provided at equal intervals in the circumferential direction at the magnet end on the rotor inner diameter side. Yes. However, it is considered that the inner wall of the rotor core between the air gaps needs to be spaced within a range that maintains the mechanical strength, and there is still a problem that the leakage magnetic flux cannot be sufficiently reduced.

  The present invention has been made to solve the above-described problems, and is a permanent magnet type rotating electrical machine devised so as to obtain sufficient strength against centrifugal force while reducing leakage magnetic flux on the rotor inner diameter side. The purpose is to obtain.

A permanent magnet type rotating electrical machine according to the present invention is provided on a stator core having a stator magnetic pole, a stator having a stator winding wound around the stator magnetic pole, and a rotating shaft that rotates with respect to the stator. The rotor is composed of a rotor core having a magnetic pole that is magnetically coupled to face the stator magnetic pole, and is disposed between the magnetic poles and is magnetized in the circumferential direction and substantially linear in the axial direction. And a non-magnetic holding member penetrating in the axial direction into a holding member insertion hole provided in the rotor core near the rotation shaft side end of the permanent magnet , and the holding member is a holding member insertion hole It has a part larger than the circumferential direction dimension .

  According to this invention, since the nonmagnetic holding member penetrating in the axial direction is provided in the holding member insertion hole provided at the rotation shaft side end of the permanent magnet, the magnetic flux leaking to the rotor inner diameter side is reduced. High torque can be obtained, permanent magnets can be prevented from being damaged during the manufacturing process, and the mechanical strength of the rotor core can be ensured, so that the speed of the rotating electrical machine can be increased.

It is sectional drawing perpendicular | vertical to the axial direction of the permanent magnet type rotary electric machine which concerns on Embodiment 1 of this invention. It is a part of sectional drawing of the rotor perpendicular | vertical to the axial direction of a permanent-magnet-type rotary electric machine which showed the relationship between the magnetization direction of the permanent magnet of the permanent-magnet-type rotary electric machine which concerns on Embodiment 1 of this invention, and a magnetic flux. . It is a part of sectional drawing of the rotor perpendicular | vertical to the axial direction of the permanent magnet type rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure showing the comparison of the BH characteristic by the presence or absence of the core deterioration of the permanent magnet type rotary electric machine which concerns on Embodiment 1 of this invention. FIG. 2 is a perspective view of a holding member and a holding member insertion hole of the permanent magnet type rotating electric machine according to Embodiment 1 of the present invention. 1 is an exploded perspective schematic view of a permanent magnet type rotating electric machine according to Embodiment 1 of the present invention. It is a disassembled perspective schematic diagram of the permanent magnet type rotary electric machine which concerns on Embodiment 2 of this invention. It is a disassembled perspective schematic diagram of the permanent magnet type rotary electric machine which concerns on Embodiment 3 of this invention. The perspective view of the holding member and holding member insertion hole of the permanent magnet type rotary electric machine which concerns on Embodiment 3 of this invention is shown. It is a disassembled perspective schematic diagram of the permanent magnet type rotary electric machine which concerns on Embodiment 4 of this invention. The perspective view of the holding member and holding member insertion hole of the permanent magnet type rotary electric machine which concerns on Embodiment 4 of this invention is shown. It is a part of sectional drawing of the rotor perpendicular | vertical to the axial direction of the permanent magnet type rotary electric machine which concerns on Embodiment 5 of this invention. It is a side view of the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 6 of this invention. It is a part of sectional drawing of the rotor perpendicular | vertical to the axial direction of the permanent magnet type rotary electric machine which concerns on Embodiment 6 of this invention.

Embodiment 1 FIG.
Hereinafter, a permanent magnet type rotating electrical machine according to Embodiment 1 of the present invention will be described with reference to FIGS.
1 is a cross-sectional view perpendicular to the axial direction of a permanent magnet type rotating electric machine according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a part of the rotor of FIG. The relationship between the magnetization direction and the magnetic flux is shown. FIG. 3 shows a region where the holding member is inserted and the magnetic permeability is lowered due to deterioration of the rotor core. FIG. 4 shows a comparison of BH characteristics depending on the presence or absence of deterioration in an electromagnetic steel sheet or the like as a magnetic member. FIG. 5 is a perspective view of the holding member and the holding member insertion hole. FIG. 6 is an exploded perspective schematic view of a permanent magnet type rotating electrical machine.
In this embodiment, a vertical embedded (spoke) type permanent magnet synchronous motor will be described as an example of a rotating electrical machine.

As shown in FIGS. 1 to 3, the permanent magnet type rotating electric machine 10 according to the first embodiment of the present invention is arranged on the inner side of the annular stator 1 and the stator 1 and rotates with respect to the stator 1. The rotor 1 is provided on the rotating shaft 2 and the stator 1 and the rotor 3 are configured around the same rotating shaft 2.
The stator 1 includes a stator core 12 having a stator magnetic pole (tooth) 11 and a stator winding 13 wound around the stator magnetic pole 11. The rotor 3 has a rotor core 31 having magnetic poles that are magnetically coupled to face the stator magnetic pole 11, and is arranged between the magnetic poles. The rotor 3 is magnetized in the circumferential direction and arranged substantially linearly in the axial direction. A plurality of permanent magnets 32 and a nonmagnetic holding member 34 penetrating in the axial direction through a holding member insertion hole 33 provided in the rotor core near the rotating shaft side end of the permanent magnet 32 are configured.

The permanent magnet 32 is embedded in the rotor core 31 so that the same poles are opposed to each other in the circumferential direction in a radial manner around the rotation axis 2, and the permanent magnet 32 is arranged in the radial direction around the rotation axis 2. It has a longitudinal shape, and is a vertically embedded (spoke) embedded magnet rotating electrical machine in which a permanent magnet 32 is vertically embedded in a rotor core 31.
In addition, although the permanent magnet 32 is configured using a ferrite magnet, other magnets such as a rare earth magnet such as neodymium and a samarium cobalt magnet may be used.

The rotor core 31 has a flange 35 that holds the permanent magnet 32 at a position facing the stator 1, and is configured by laminating a magnetic member in the axial direction with bolts, pins, caulking, or the like. The stator 1 is similarly configured by laminating magnetic members. Here, the number of permanent magnets 32 (the number of poles) is 8, the number of stator magnetic poles 11 (or the number of slots) is 12, and the number of poles and the number of slots is 2: 3. There is no problem with the combination of the number of poles and the number of slots.
Further, in the embodiment shown in FIG. 1, an inner rotor type rotating electrical machine in which the stator 1 is disposed on the outside and the rotor 3 is disposed on the inside, the outer rotor in which the positions of the stator 1 and the rotor 3 are interchanged. There is no problem with the type of rotating electrical machine.

  The holding members 34 are arranged at equal intervals in the circumferential direction around the rotating shaft 2 around the end of the permanent magnet 32 on the rotating shaft 2 side, and are embedded in holding member insertion holes 33 provided in the rotor core 31. . The holding member 34 is made of nonmagnetic steel such as SUS304, but may be other nonmagnetic materials such as aluminum alloy, ceramic, and titanium.

As shown in FIG. 2, the magnetization direction 36 of the permanent magnet 32 is magnetized in the substantially circumferential direction as indicated by the thick black arrow, and the magnetization directions of the adjacent permanent magnets 32 are opposite. Further, the magnetic flux 37 generated by the permanent magnet 32 is generally distributed as shown by the white thin arrows in FIG.
For example, the magnetic flux 37 passes through the rotor core 31 between the adjacent permanent magnets 32 substantially outward or inward in the radial direction. Torque is generated by the magnetic flux 37 interlinking with the stator winding 13 of the stator 1.

On the other hand, the leakage magnetic flux 37 a indicated by the outlined thin arrow in FIG. 2 passes from the permanent magnet 32 through the rotor core 31 on the rotating shaft 2 side toward the same permanent magnet 32. Since this leakage magnetic flux 37a does not interlink with the stator winding 13 of the stator 1, it is a magnetic flux that does not contribute to torque and needs to be reduced. For example, there is a method of separating the rotor core 31 in the circumferential direction for each magnetic pole in order to increase the magnetic resistance of the magnetic path through which the leakage magnetic flux 37a passes.
However, if the rotor core 31 is separated, the rotor core 31 may be damaged by centrifugal force during high-speed rotation. Further, when the stress from the rotor iron core 31 is applied to the permanent magnet 32, the permanent magnet 32 is broken and enters the gap between the rotor 3 and the stator 1, and the permanent magnet type synchronous motor itself may break down. .

  In the present invention, in order to reduce the above-described leakage magnetic flux 37 a, the holding member insertion hole 33 is provided in the rotor core 31 near the rotating shaft side end of the permanent magnet 32, and the non-magnetic holding is held in the holding member insertion hole 33. By providing the member 34 penetrating in the axial direction, a portion where the magnetic permeability of the rotor core 31 is reduced is provided. By doing in this way, since the rotor core 31 can be united in the circumferential direction, leakage magnetic flux can be reduced, ensuring mechanical strength.

  When the holding member 34 is inserted into the holding member insertion hole 33, the circumferential dimension of the holding member 34 is slightly larger than the circumferential dimension of the holding member insertion hole 33 as will be described later. Therefore, by inserting the holding member 34 into the holding member insertion hole 33, a location where stress is applied to the rotor core 31 is generated. The portion where the stress is applied becomes a core deteriorated portion 38 as shown in FIG. 3, and the core deteriorated portion 38 is a rotor core 31 having a size that is increased in the circumferential direction from the inner wall of the rotor core between the holding member insertion holes 33. As a result, the magnetic permeability decreases.

Deterioration of the rotor core 31 by the core deterioration part 38 will be described with reference to FIG. FIG. 4 shows a comparison of the BH characteristics depending on the presence or absence of deterioration in the electromagnetic steel sheet used for the rotor core 31.
As shown in FIG. 4, when an electrical steel sheet is subjected to compression or tensile stress, the magnetic steel sheet deteriorates, the magnetic flux density is lowered, and the magnetic permeability is lowered. In the present invention, the core deterioration portion 38 deteriorated in the rotor core 31 by inserting the holding member 34 into the holding member insertion hole 33 and applying a compressive stress or a tensile stress to the rotor core 31 around the holding member insertion hole 33. By providing, the magnetic permeability of the core degradation part 38 falls and the leakage magnetic flux 37a can be reduced. And the core degradation part 38 of the rotor iron core 31 is work-hardened by the compressive stress by the holding member 34 being added, and can raise mechanical strength further.

FIG. 5 is a perspective view of the holding member 34, the core deterioration portion 38, and the holding member insertion hole 33. Although not shown in FIG. 5, the holding member insertion hole 33 is provided in the rotor core 31. The cross-sectional shape of the axial end surface of the holding member 34 is substantially the same shape as the holding member insertion hole 33, and is configured to extend in the axial direction. However, the circumferential dimension of the holding member 34 is larger than the circumferential dimension of the holding member insertion hole 33 so that the holding member 34 is press-fitted into the holding member insertion hole 33.
For example, as shown in FIG. 5A, the holding member 34 has a tapered shape in which the circumferential dimension increases toward the axial direction. Further, as shown in FIG. 5B, the holding member 34 has a shape in which the circumferential dimension increases toward the midpoint in the axial direction.

  With such a configuration, it is possible to apply a compressive stress to the rotor core 31 around the holding member insertion hole 33 when the holding member 34 is inserted, and the insertion of the holding member 34 into the holding member insertion hole 33 becomes easy. Will improve. Although the method for inserting the holding member 34 by press fitting has been described above, the holding member 34 may be inserted by cold fitting, or the rotor core 31 may be shrink fitted and inserted. However, the press-fitting allowance and the fitting allowance are set to dimensions that do not impair the mechanical strength of the rotor core 31 and the holding member 34.

Since the permanent magnet 32 is generally weak in mechanical strength, it may be damaged when subjected to stress. For this reason, it is desirable that the circumferential dimension of the holding member insertion hole 33 be equal to or larger than the circumferential dimension of the permanent magnet 32. By setting it to the dimension in the circumferential direction or more, the local stress difference to the permanent magnet 32 is relieved, and the permanent magnet 32 is hardly cracked.
In addition, the holding member insertion hole 33 is provided in a region on the inner diameter side of the extension line of the rotation shaft side end portion of the permanent magnet 32 in the vertical cross section of the rotation shaft 2, so that stress at the time of insertion of the holding member 34 is obtained. Is transmitted to the permanent magnet 32.

  Next, in order to reduce the leakage magnetic flux 37a while ensuring the mechanical strength, the interval between the rotor cores 31 between the holding member insertion holes 33 is reduced to such an extent that the mechanical strength is not impaired. Desirably, the interval between the rotor cores 31 between the holding member insertion holes 33 is parallel. Similarly, the space | interval of the rotor core 31 between the holding member insertion hole 33 and the rotating shaft 2 is made thin so that mechanical strength may not be impaired.

  FIG. 6 is an exploded perspective schematic view of the rotor 3 (rotor core 31, permanent magnet 32, holding member 34). As shown in FIG. 6, the permanent magnet 32 and the holding member 34 are arranged on the rotor core 31 at equal intervals in the circumferential direction around the rotary shaft 2 and are inserted in the axial direction. In addition, an end plate 39 having a diameter smaller than the radius of the rotor core 31, through which the rotary shaft 2 passes and facing the axial end surface of the permanent magnet 32, and a through bolt or pin for fastening the rotor core 31 and the end plate 39 together. (Not shown) may be used.

  As described above, the first embodiment of the present invention is a non-magnetic holding member that penetrates the holding member insertion hole 33 provided at the end of the permanent magnet 32 in the axial direction without dividing the rotor core 31. Since 34 is provided, the leakage flux can be reduced and the output density of the rotating electrical machine can be improved. Further, without applying stress to the permanent magnet 32, stress is applied to the rotor core 31 by the holding member 34, and the inner peripheral side of the rotor core 31 is deteriorated to lower the magnetic permeability, thereby further reducing the leakage magnetic flux. be able to. Furthermore, by making the holding member 34 tapered in the circumferential direction, the insertion into the holding member insertion hole 33 is facilitated, and the assembling performance is improved.

Embodiment 2. FIG.
Next, a permanent magnet type rotating electrical machine according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 is an exploded perspective schematic view of the permanent magnet type rotating electric machine according to the second embodiment.
In Embodiment 1, when the holding member 34 (FIG. 5A) having a tapered shape whose circumferential dimension increases toward the axial direction is inserted from the same direction, in the configuration of FIG. The core deterioration portion 38 is biased between the axial insertion side and the non-insertion side. Further, since the center of gravity of the holding member 34 is different from the axial center point, the center of gravity of the rotor 3 itself may deviate from the axial center point when inserted from the same direction. Therefore, since the rotor 3 is magnetically and structurally unbalanced, a thrust force may be generated.

The invention of the second embodiment is configured to prevent such a magnetic and structural balance from being biased. As shown in FIG. 7, the holding member 34 includes the rotor core 31. The first holding member 34a and the second holding member 34b having the same length as the axial direction are divided, and the axial end face has a small cross-sectional area (tapered shape is not shown). Insert them alternately from both ends in the axial direction.
As in FIG. 6, the permanent magnet 32, the first holding member 34 a, and the second holding member 34 b are arranged at equal intervals in the circumferential direction around the rotating shaft 2 on the rotor core 31 and inserted in the axial direction. .

Although omitted in FIG. 7, the end plate which faces the axial end surfaces of the rotary shaft 2 and the permanent magnet 32 and has a diameter smaller than the radius of the rotor core 31, and the through which fastens the rotor core 31 and the end plate are fastened. Bolts or pins may be used.
As described above, according to the second embodiment, the first holding member 34 a and the second holding member 34 b having the same length as the axial length of the rotor core 31 are reduced in cross-sectional area from both ends of the rotor core 31. Since the surfaces are opposed to each other in the circumferential direction, the rotor core 31 deteriorates in the axial direction, so that the magnetic and structural balance of the rotor 3 is improved, and the thrust force can be suppressed.

Embodiment 3 FIG.
Next, a permanent magnet type rotating electrical machine according to Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 8 is an exploded perspective schematic view of the permanent magnet type rotating electrical machine in the third embodiment, and FIG. 9 is a perspective view of the holding member and the holding member insertion hole.
In the first and second embodiments, the holding members 34 having substantially the same axial dimension as the rotor core 31 are inserted into the holding member insertion holes 33 alternately from one end or both ends in the axial direction, and have a tapered shape. When the holding member 34 is inserted, the method of applying stress to the rotor core 31 is different between the insertion side and the non-insertion side. For this reason, the non-insertion-side core deterioration part 38 may have a deteriorated area or a deterioration degree smaller than the core deterioration part 38 on the holding member insertion side.

The invention of the third embodiment is configured such that the core deteriorated portion is uniform in the axial direction. As shown in FIGS. 8 and 9, the holding member 34 is the axial length of the rotor core 31. The length is divided into a first holding member 34c and a second holding member 34d having a length obtained by dividing the length into two equal parts. The first holding member 34c and the second holding member 34d are inserted into the holding member insertion hole 33 from both ends through a surface (tapered shape is not shown) having a small cross-sectional area of the axial end surface.
As in FIG. 6, the permanent magnet 32, the first holding member 34 c, and the second holding member 34 d are arranged at equal intervals in the circumferential direction around the rotating shaft 2 on the rotor core 31 and inserted in the axial direction. .

Although omitted in FIG. 8, an end plate that faces the axial end surfaces of the rotary shaft 2 and the permanent magnet 32 and has a diameter smaller than the radius of the rotor core 31, and a through hole that fastens the rotor core 31 and the end plate. Bolts or pins may be used.
9 shows a perspective view of the core deterioration portion 38 and the holding member insertion hole 33 together with the first holding member 34c and the second holding member 34d. Although not shown in FIG. 9, the rotor core 31 is provided between the first holding member 34c and the second holding member 34d.

As shown in FIG. 8, the permanent magnets 32 embedded in the rotor core 31 are arranged in the same manner as in the first embodiment, and the first holding member 34c and the second holding member are divided into approximately two equal parts in the axial direction. The member 34d is provided.
As shown in FIG. 9, the cross-sectional shape of the axial end surfaces of the holding members 34 c and 34 d is substantially the same shape as the holding member insertion hole 33, and is configured to extend in the axial direction. When the holding members 34 c and 34 d are press-fitted into the holding member insertion hole 33, the holding members 34 c and 34 d have a portion whose circumferential dimension is equal to or larger than the circumferential dimension of the holding member insertion hole 33. Preferably, the taper shape has a circumferential dimension that increases in the axial direction.

Although the method for inserting the holding member 34 by press-fitting has been described above, the holding members 34c and 34d may be inserted by cold fitting or the rotor core 31 may be shrink-fitted and inserted. However, the press-fitting allowance and the fitting allowance are set to dimensions that do not impair the mechanical strength of the rotor core 31 and the holding members 34c and 34d.
Then, by inserting the first holding member 34c and the second holding member 34d into the holding member insertion hole 33 from the opposite ends in the axial direction of the rotor core 31 so as to face each other, the core deterioration portion 38 is inserted. Can be provided around each holding member insertion hole 33 near both ends of the rotor core 31.

As described above, in the third embodiment, the holding member 34 is divided into the first holding member 34c and the second holding member 34d each having a length obtained by substantially dividing the axial length of the rotor core 31 into two equal parts. Since the surfaces having a small cross-sectional area face each other and are arranged from both ends of the rotor core 31, the rotor core 31 deteriorates in the upper and lower directions in the axial direction, so the magnetic and structural balance of the rotor 3 is good. The thrust force can be suppressed.
In addition, since the area where stress is applied to the rotor core 31 is increased as compared with the first and second embodiments, the core deterioration region can be increased, the leakage magnetic flux can be further reduced, and the output can be improved. Moreover, since the holding member 34 is divided into two in the axial direction, the eddy current flowing in the holding member can be reduced.

Embodiment 4 FIG.
Next, a permanent magnet type rotating electrical machine according to Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 10 is an exploded perspective schematic view of the permanent magnet type rotating electric machine according to Embodiment 4, and FIG. 11 is a perspective view of the holding member and the holding member insertion hole.
In the invention of the third embodiment, the holding member 34 is divided into a first holding member 34c and a second holding member 34d having a length obtained by substantially dividing the axial length of the rotor core 31 into two equal parts. In the invention of the fourth embodiment, the holding member 34 is divided into approximately two equal parts in the circumferential direction of the rotor core 31.

As shown in FIGS. 10 and 11, the first and second holding members 34e and 34f are substantially the same length as the axial length of the rotor core 31, and are perpendicular to the axial direction of the holding members 34e and 34f. The shape is substantially the same as that obtained by dividing the circumferential direction of the holding member insertion hole 33 into approximately two equal parts, and is configured to extend in the axial direction.
The first holding member 34e and the second holding member 34f are inserted into one holding member insertion hole 33 from both ends from a surface (taper shape is not shown) having a small cross-sectional area of the axial end surface thereof.
As in FIG. 6, the permanent magnet 32, the first holding member 34 e, and the second holding member 34 f are arranged at equal intervals in the circumferential direction around the rotating shaft 2 on the rotor core 31 and inserted in the axial direction. .

As shown in FIG. 10, the permanent magnets 32 embedded in the rotor core 31 are arranged in the same manner as in the first embodiment, and the first holding member 34e and the second holding member are divided into substantially equal parts in the circumferential direction. A member 34 f is provided by being inserted into one holding member insertion hole 33. Although omitted in FIG. 10, as in the first to third embodiments, an end plate that faces the axial end surfaces of the rotor core 31 and the permanent magnet 32 and has a diameter smaller than the radius of the rotor core 31, and A through bolt or pin for fastening the rotor core 31 and the end plate may be used.
FIG. 11 shows a perspective view of the core deterioration portion 38 and the holding member insertion hole 33 together with the first holding member 34e and the second holding member 34f. Although not shown in FIG. 11, the rotor core 31 is provided between the first holding member 34e and the second holding member 34f.

In the case where the first holding member 34e and the second holding member 34f are press-fitted into the holding member insertion hole 33, the circumferential dimension of each holding member 34e, 34f is approximately equal to or more than half of the holding member insertion hole 33. Have Preferably, the taper shape has a circumferential dimension that increases in the axial direction.
In FIG. 11, the surface that contacts the rotor core 31 between the holding member insertion holes 33 is tapered, but the surface that contacts the first holding member 34e and the second holding member 34f may be tapered. Alternatively, both the surface in contact with the rotor core 31 and the surface in contact with the holding members 34e and 34f may be tapered.

In the above description, the method for inserting the holding members 34e and 34f by press fitting is described. However, the holding members 34e and 34f are inserted by cold fitting. Alternatively, the rotor core 31 may be inserted by shrink fitting. However, the press-fitting allowance and the fitting allowance are set to dimensions that do not impair the mechanical strength of the rotor core 31 and the holding members 34e and 34f.
Then, by inserting the surfaces of the first holding member 34e and the second holding member 34f having small cross-sectional areas into the holding member insertion holes 33 from both ends of the rotor core 31, the core deterioration portion 38 is inserted into both ends of the rotor core 31. It can be provided around each holding member insertion hole 33 in the vicinity.

  As described above, according to the fourth embodiment, the holding member 34 is divided into the first holding member 34e and the second holding member 34f having a circumferential dimension obtained by dividing the circumferential dimension of the holding member insertion hole 33 into approximately two equal parts. Since it is divided and arranged from both ends of the rotor core 31 with the faces having a small cross-sectional area facing each other, the area where the stress is applied to the rotor core 31 is increased, so that the core deterioration region can be increased, and the leakage magnetic flux is further increased. Can be reduced and the output can be improved.

Embodiment 5. FIG.
Next, a permanent magnet type rotating electric machine according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 12 shows a part of a cross-sectional view of the rotor perpendicular to the axial direction of the rotating electrical machine according to the fifth embodiment.
As shown in FIG. 12, the holding member 34 includes a concave portion 34 g having substantially the same dimension as the circumferential direction dimension of the permanent magnet 32 on the surface in contact with the permanent magnet 32 so as to wrap the end portion on the rotating shaft side of the permanent magnet 32. ing. The concave portion 34g can accommodate a part of the rotating shaft side of the permanent magnet 32 in the holding member 34, and can regulate the radial movement of the holding member 34 together with the flange 35 that holds the stator side end of the permanent magnet 32. .

The permanent magnet 32 and the holding member 34 can be integrated by means such as fitting by a concave portion 34g and further adhesion. Since the permanent magnet 32 and the holding member 34 can be integrated, cracking and breakage can be prevented during the manufacturing process of inserting the permanent magnet 32 into the rotor core 31. As described above, the permanent magnet 32 is magnetized in the circumferential direction, and the output is improved by reducing the magnetic gap between the long side extending in the radial direction of the permanent magnet 32 and the rotor core 31 as much as possible.
Therefore, since the holding member 34 integrated with the permanent magnet 32 can position and hold the permanent magnet 32, the surface in contact with the long side of the permanent magnet 32 can be assembled without using an adhesive or the like.

In the fifth embodiment, the case where the shape of the holding member 34 is deformed in the structure of the first embodiment has been described. However, the shape of the holding member 34 in the second to fourth embodiments is changed to the shape of the fifth embodiment. There is no problem even when applying.
As described above, in the fifth embodiment, the concave portion 34g is provided on the holding member surface in contact with the permanent magnet so that the holding member 34 covers a part of the permanent magnet 32. This improves the assembly performance.

Embodiment 6 FIG.
Next, a permanent magnet type rotating electric machine according to Embodiment 6 of the present invention will be described with reference to FIGS. FIG. 13 is a side view of the rotor of the rotating electrical machine according to the sixth embodiment, and FIG. 14 is a partial cross-sectional view of the rotor perpendicular to the axial direction of the rotating electrical machine.
So far, in Embodiments 1 to 5, the shape of the holding member 34 in the circumferential direction and the radial direction has been defined. However, the invention of Embodiment 6 has the shape of the inner wall of the rotor core 31 between the holding member insertion holes 33. Is specified.

As shown in FIG. 13, the vicinity of the end portion of the rotor core 31 in the rotor 3 is an AA cross section, and the vicinity of the midpoint of the rotor core 31 is a BB cross section. Then, as shown in FIG. 14, the short side extending in the radial direction of the holding member insertion hole 33 and the short side extending in the radial direction of the adjacent holding member insertion hole 33 are parallel, and the distance between the two sides is L. .
Here, the relationship between the distance L1 between the inner walls of the section AA and the distance L2 between the inner walls of the section BB is configured to satisfy L1 <L2. And the circumferential direction dimension of the holding member 34 has a part which is more than the circumferential direction dimension of the holding member insertion hole 33 of a BB cross section.

  In this way, by making the interval L of the rotor core 31 between the holding member insertion holes 33 variable along the axial direction, when the holding member 34 is inserted, the rotor core 31 between the holding member insertion holes 33 is inserted into the rotor core 31. When the stress is applied, the core deterioration portion 38 is generated in the rotor core 31, and the leakage magnetic flux can be reduced. Note that the length of L of the rotor core 31 corresponding to the section from the AA cross section to the BB cross section may be increased stepwise or continuously. Further, the end of the rotor core 31 on the opposite side of the AA cross section may be considered symmetrical about the BB cross section.

The shape of the holding member 34 has a portion that is equal to or larger than the circumferential dimension of the holding member insertion hole 33, and the above-described effect can be obtained even when the holding member 34 is linearly extended in the axial direction. Since the rotor core 31 can be stressed more by forming the taper shape with a smaller circumferential dimension, the leakage magnetic flux can be reduced. However, the dimension L and the circumferential dimension of the holding member 34 are set to such dimensions that the mechanical strength of the rotor core 31 and the holding member 34 is not impaired.
Although not shown in FIG. 14, an end plate which faces the axial end surfaces of the rotor core 31 and the permanent magnet 32 and has a diameter smaller than the radius of the rotor core 31, and the rotor core 31 and the end plate There may be a case where a through bolt or a pin is used to fasten.

As described above, according to the sixth embodiment, the distance between the holding members 34 is reduced toward the both ends in the axial direction, so that the leakage magnetic flux is reduced and the rotation is performed without dividing the rotor core 31. The output density of the electric machine can be improved.
It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1: Stator, 2: Rotating shaft, 3: Rotor, 11: Stator magnetic pole (tooth),
12: Stator core, 13: Stator winding, 31: Rotor core, 32: Permanent magnet,
33: holding member insertion hole, 34, 34a to 34f: holding members (first and second holding members),
34 g: recessed portion, 35: ridge, 36: magnetization direction, 37: magnetic flux, 38: core deteriorated portion,
39: End plate.

Claims (8)

The stator comprises a stator core having a stator magnetic pole, a stator having a stator winding wound around the stator magnetic pole, and a rotor provided on a rotating shaft that rotates with respect to the stator. The rotor includes a rotor core having magnetic poles that are magnetically coupled to face the stator magnetic poles, and a permanent magnet that is disposed between the magnetic poles and is magnetized in the circumferential direction and arranged substantially linearly in the axial direction. And a non-magnetic holding member penetrating in the axial direction into a holding member insertion hole provided in the rotor iron core near the rotary shaft side end of the permanent magnet, and the holding member is provided in the holding member insertion hole. A permanent magnet type rotating electrical machine having a portion larger than a circumferential dimension . The stator comprises a stator core having a stator magnetic pole, a stator having a stator winding wound around the stator magnetic pole, and a rotor provided on a rotating shaft that rotates with respect to the stator. The rotor includes a rotor core having magnetic poles that are magnetically coupled to face the stator magnetic poles, and a permanent magnet that is disposed between the magnetic poles and is magnetized in the circumferential direction and arranged substantially linearly in the axial direction. When, a holding member of nonmagnetic said axially penetrating the holding member insertion hole provided in the rotor core in the vicinity of the rotary shaft side end of the permanent magnet, the retaining member, said rotor core adjacent to opposed wall surfaces are to that permanent magnet rotating electrical machine, characterized in that a tapered more circumferential dimension toward the axial direction becomes large. The stator comprises a stator core having a stator magnetic pole, a stator having a stator winding wound around the stator magnetic pole, and a rotor provided on a rotating shaft that rotates with respect to the stator. The rotor includes a rotor core having magnetic poles that are magnetically coupled to face the stator magnetic poles, and a permanent magnet that is disposed between the magnetic poles and is magnetized in the circumferential direction and arranged substantially linearly in the axial direction. And a non-magnetic holding member penetrating in the axial direction through a holding member insertion hole provided in the rotor core near the rotary shaft side end of the permanent magnet, the holding member being to that permanent magnet rotating electrical machine, characterized in that as the circumferential dimension toward the point it is in the larger shape. The holding member has a first holding member and a second holding member each having a length obtained by dividing the axial length of the rotor core into approximately two equal parts. The permanent magnet type rotating electric machine according to claim 2 , wherein the permanent magnet type rotating electric machine is arranged from both ends of the iron core. The holding member has a first holding member and a second holding member having a circumferential dimension obtained by dividing the circumferential direction of the holding member insertion hole into two substantially equal parts, and faces the surfaces having a small cross-sectional area to face the rotor. The permanent magnet type rotating electric machine according to claim 2 , wherein the permanent magnet type rotating electric machine is arranged from both ends of the iron core. The rotor core, wherein a short side extending in a radial direction of the holding member insertion hole, and a short side extending in a radial direction of the holding member insertion holes adjacent, claim 1, characterized in that the parallel Item 6. The permanent magnet type rotating electrical machine according to any one of Item 5 . The stator comprises a stator core having a stator magnetic pole, a stator having a stator winding wound around the stator magnetic pole, and a rotor provided on a rotating shaft that rotates with respect to the stator. The rotor includes a rotor core having magnetic poles that are magnetically coupled to face the stator magnetic poles, and a permanent magnet that is disposed between the magnetic poles and is magnetized in the circumferential direction and arranged substantially linearly in the axial direction. And a nonmagnetic holding member penetrating in an axial direction through a holding member insertion hole provided in the rotor core near the rotary shaft side end of the permanent magnet, the holding member enclosing the permanent magnet as lifting, features and to that permanent magnet electric motor in that a recess on one surface of the holding member in contact with the permanent magnet. The stator comprises a stator core having a stator magnetic pole, a stator having a stator winding wound around the stator magnetic pole, and a rotor provided on a rotating shaft that rotates with respect to the stator. The rotor includes a rotor core having magnetic poles that are magnetically coupled to face the stator magnetic poles, and a permanent magnet that is disposed between the magnetic poles and is magnetized in the circumferential direction and arranged substantially linearly in the axial direction. And a non-magnetic holding member penetrating in the axial direction through a holding member insertion hole provided in the rotor core near the rotary shaft side end of the permanent magnet, and the rotor core is between the holding members interval, becomes smaller to that permanent magnet rotating electrical machine, characterized in that increases toward both axial ends of the.