JP2013198304A - Rotor structure of permanent magnet type rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor structure of a permanent magnet type rotary machine that has advantages of both a completely split iron core structure and a completely integrated iron core structure.SOLUTION: In a rotor structure of a permanent magnet type rotary machine constituted having a rotor iron core 1 and a permanent magnet 2 arranged alternately in a circumferential direction, the rotor iron core 1 comprises integrated iron cores 111, 121 comprising a plurality of integrated iron core pieces 111A, 121A arranged in peripheral directions respectively for every other pole and integrated iron core connection parts 111B, 121B connecting the plurality of integrated iron core pieces 111A, 121B in one body radially inside, and an N-pole iron core 11 and an S-pole iron core 12 comprising a plurality of split iron cores 112, 122 overlaid axial one-end surfaces of the plurality of integrated iron core pieces 111A, 121A, the N-pole iron core 11 and S-pole iron core 12 being arranged such that the axial one-end surfaces are opposed and the N-pole iron core 11 and S-pole iron core 12 are arranged alternately in the circumferential direction.

Description

  The present invention relates to a rotor structure of a permanent magnet type rotating electrical machine using a permanent magnet, and more particularly to a rotor structure for realizing a high magnetic flux density of a permanent magnet type rotating electrical machine.

  Conventionally, in a permanent magnet type rotating electric machine, a technique of arranging a magnet in a spoke form is known as a method for realizing a high gap magnetic flux density (see, for example, Patent Document 1). There are currently two types of rotor structures that can be used to arrange magnets in the spoke type: a fully divided core structure that completely divides the iron core, and a fully integrated core structure that slightly connects the iron core. ing.

JP 2011-78298 A

  However, in the completely divided core structure, there is a problem that a large number of members for fixing the divided core and man-hours for assembling and fixing are required in order to accurately integrate the completely divided rotor core. . Further, it is conceivable to provide a through-hole penetrating in the axial direction in the split iron core, further providing plate members on both end faces of the iron core, and fixing the split iron core by inserting a support member such as a round bar into the through-hole. However, when this method is applied to a rotating machine having a long core thickness, the support member also becomes long depending on the thickness, and the centrifugal force and the rotational force of the split core depending on the thickness are large. The problem of insufficient strength and rigidity of the support member was considered.

As another method, for example, when a non-magnetic cylindrical member (non-magnetic ring member) is provided on the outer periphery of the rotor to integrate the divided iron cores, the thickness of the cylindrical member and the cylindrical member are The gap between the rotor and the rotor of the rotating machine widens by taking into account the accuracy when assembled to the rotor, and there is a problem that it is difficult to effectively improve the gap magnetic flux density.
In order to withstand the centrifugal force during the rotation of the rotor, the strength and rigidity of the cylindrical member are required to firmly integrate the split iron core, but this depends on the thickness of the cylindrical member. That is, there is a problem that the improvement of the strength of the cylindrical member and the improvement of the gap magnetic flux density are in a trade-off relationship.

  Moreover, since the split iron core and the rotating machine shaft are fastened through the plate member on the end surface of the iron core, the fastening strength of the split iron core and the rotating machine shaft is solely borne by the plate member. There was also a problem of low reliability.

  On the other hand, in the above-described fully integrated iron core structure, leakage of magnetic flux is unavoidable at the connecting portion, and therefore the gap magnetic flux density is reduced. In particular, when a permanent magnet (such as a ferrite magnet) that does not use rare earth and has a low residual magnetic flux density is used, it is difficult to magnetically saturate the connecting portion of the iron core, and the magnetic flux density of the gap is greatly reduced. there were.

  In order to magnetically saturate the connecting portion of the iron core, it is necessary to make the connecting portion as thin as possible. Improvement in the magnetic flux density of the gap is a trade-off between accuracy in manufacturing the iron core and strength of the connecting portion.

  In order to reduce the leakage of magnetic flux, the connecting part is usually made thin, so it is difficult to expect the connecting part as a strength member. The strength problem related to the fastening between the iron core and the rotating machine shaft is a completely divided iron core. Almost the same as the structure.

  In view of the above, an object of the present invention is to provide a rotor structure of a permanent magnet type rotating electrical machine that has the advantages of both a fully divided iron core structure and a fully integrated iron core structure.

  The rotor structure of the permanent magnet type rotating electric machine according to the first invention for solving the above-mentioned problems is the rotation of the permanent magnet type rotating electric machine having a configuration in which the rotor cores and the permanent magnets are alternately arranged in the circumferential direction. In the child structure, the rotor core is an integrated unit composed of a plurality of integral core pieces arranged at every other pole in the circumferential direction and an integral core connecting portion that integrally couples the plurality of integral core pieces radially inward. An N-pole core and an S-pole core, each composed of an iron core and a plurality of divided iron cores superimposed on one axial end surface of the plurality of integral core pieces, and the N-pole core and the S-pole core are The N pole iron core and the S pole iron core are combined so that the one end surfaces in the axial direction face each other and are alternately arranged in the circumferential direction.

  Further, a rotor structure of a permanent magnet type rotating electrical machine according to a second invention for solving the above-mentioned problems is the rotor structure of the permanent magnet type rotating electrical machine according to the first invention, wherein the axial direction of the integral iron core is the same. The axial thickness of the divided iron core is configured to be thicker by a predetermined thickness that is equal to or greater than a distance that can ensure a magnetic resistance that prevents magnetic flux leakage in the axial direction. .

  Further, a rotor structure of a permanent magnet type rotating electrical machine according to a third invention for solving the above-described problem is the rotor structure of the permanent magnet type rotating electrical machine according to the second invention, wherein The annular member having the predetermined thickness is interposed between the N pole iron core and the S pole iron core.

  A rotor structure of a permanent magnet type rotating electrical machine according to a fourth aspect of the present invention for solving the above problem is the rotor structure of the permanent magnet type rotating electrical machine according to any one of the first to third aspects of the invention. A plurality of the rotor cores are laminated in the axial direction.

  In addition, a rotor structure of a permanent magnet type rotating electrical machine according to a fifth aspect of the present invention for solving the above problems is the rotor structure of the permanent magnet type rotating electrical machine according to any one of the first to fourth aspects of the invention. The rotor core has a gap between the integral core connecting portion and the split core with respect to the radial direction, and another permanent magnet magnetized in the radial direction is disposed in the gap. And

  According to the rotor structure of the permanent magnet type rotating electric machine according to the present invention described above, the assembly accuracy with the rotating machine shaft can be improved and the assembly can be facilitated as compared with the conventional fully divided core structure. Compared with the fully integrated iron core structure, leakage of magnetic flux can be prevented and a high gap magnetic flux density can be obtained.

  Further, even when applied to an electric motor having a large thickness, it is possible to easily secure a necessary thickness while maintaining strength.

  In addition, if another permanent magnet magnetized in the radial direction is disposed in the gap formed between the integral core connecting portion and the split core, a magnetic circuit using the rotor core exists in the inner and outer diameter portions of the permanent magnet. Thus, the gap magnetic flux density can be effectively improved while providing the fastening strength between the rotor core and the rotating machine shaft.

FIG. 1A is a perspective view showing an integral iron core in a rotor structure of a permanent magnet type rotating electric machine according to a first embodiment of the present invention, and FIG. 1B is a longitudinal section of FIG. 1A viewed from the front. FIG. 1 is a perspective view showing a homopolar core in a rotor structure of a permanent magnet type rotating electric machine according to a first embodiment of the present invention. It is a perspective view which shows the integral iron core in the rotor structure of the permanent magnet type rotary electric machine which concerns on 1st Example of this invention. It is a perspective view which shows the division | segmentation iron core in the rotor structure of the permanent magnet type rotary electric machine which concerns on 1st Example of this invention. It is a disassembled perspective view of the rotor core in the rotor structure of the permanent magnet type rotary electric machine which concerns on 1st Example of this invention. FIG. 6A is a front view of the permanent magnet type rotating electric machine according to the first embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along the line VI-VI in FIG. It is a perspective view which shows the rotor core in the rotor structure of the permanent magnet type rotary electric machine which concerns on the 2nd Example of this invention. It is a disassembled perspective view which shows the rotor structure of the permanent magnet type rotary electric machine which concerns on the 2nd Example of this invention. FIG. 9A is a front view of a permanent magnet type rotating electric machine according to the second embodiment of the present invention, and FIG. 9B is a cross-sectional view taken along the line IX-IX in FIG. FIG. 10A is a perspective view showing a rotor structure iron core of a permanent magnet type rotating electric machine according to a third embodiment of the present invention, and FIG. 10B shows the integral iron core of FIG. It is a front view. FIG. 11A is a perspective view showing a rotor core of a rotor structure of a permanent magnet type rotating electric machine according to a third embodiment of the present invention with a part omitted, and FIG. 11B is a third view of the present invention. It is another perspective view which abbreviate | omits and shows the rotor core of the rotor structure of the permanent magnet type rotary electric machine which concerns on an Example of this.

  Hereinafter, a rotor structure of a permanent magnet type rotating electrical machine according to the present invention will be described in detail with reference to the drawings.

(Rotor structure realizing high gap magnetic flux density)
A first embodiment of a rotor structure of a permanent magnet type rotating electric machine according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, in the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment, the rotor core 1 includes an N pole core 11, an S pole core 12, and an annular member 13 made of a nonmagnetic material. And is configured. In the present embodiment, an 8-pole type is shown as an example of the rotor core 1.

  The N-pole iron core 11 and the S-pole iron core 12 are each provided with four iron core pieces 11A and 12A arranged at equal intervals in the circumferential direction, and the N-pole iron core 11 and the S-pole iron core 12 have a single pole in the circumferential direction. By combining the phase shifts, the core pieces 11A of the N-pole core 11 and the core pieces 12A of the S-pole core 12 are alternately arranged in the circumferential direction. Further, the permanent magnet 2 is disposed between the iron core piece 11A of the N-pole iron core 11 and the iron core piece 12A of the S-pole iron core 12 with respect to the circumferential direction, whereby the rotor iron core 1 and the permanent magnet are arranged. 2 are arranged alternately in the circumferential direction.

  The configurations of the N pole core 11 and the S pole core 12 will be described in detail with reference to FIGS.

  As shown in FIG. 2, the N pole core 11 is configured by superimposing one N pole side integrated core 111 and four N pole side split cores 112 in the axial direction.

As shown in FIG. 3, the N-pole-side integrated core 111 includes four N-pole-side integrated core pieces 111A arranged at every other pole in the circumferential direction, and each N-pole-side integrated core piece 111A on the radially inner side. It is comprised from the N pole side integral iron core connection part 111B to connect.
Each of the N-pole-side integrated core pieces 111A has a substantially fan-shaped N-pole-side integrated core piece main body portion 111a, and two N poles extending along the circumferential direction on the radially outer side of the N-pole side integrated core piece main body portion 111a. The pole-side integral core outer flange portion 111b and the pole-side integral core piece base end portion extending along the circumferential direction on the radially inner side of the pole-side integral core piece main body portion 111a and connected to the pole-side integral core connecting portion 111B 111c.
The N pole-side integrated core connecting portion 111B is formed in a generally annular shape, and the diameter of the inner periphery 111d is set so that the motor shaft 3 (see FIG. 6) can be fitted, and the diameter of the outer periphery 111e is an N pole side split core that will be described later. The diameter is set smaller than the 112 inscribed circle.
Here, the thickness in the axial direction (hereinafter simply referred to as “axial direction”) of the rotating machine shaft 3 of the N-pole-side integrated iron core 111 (hereinafter referred to as “integral iron core thickness”) is defined as t1.

Further, as shown in FIG. 4, the N pole-side split core 112 is arranged in the circumferential direction on the radially outer side of the N pole-side split core main body portion 112 a and the N pole-side split core main body portion 112 a, which are each formed in a generally fan shape. Two N pole side split core outer flange portions 112b extending along the N pole side split core inner flange portion 112c extending along the circumferential direction radially inward of the N pole side split core body portion 112a. .
Here, when the thickness in the axial direction of the N-pole-side split core 112 (hereinafter referred to as the split core thickness) is t2, the split core thickness t2 is thicker than the integral core thickness t1, specifically, t2 = t1 + t3 ( However, t3 is formed so as to be the thickness of the annular member 13 in the axial direction).
The N pole side split core body portion 112a and the N pole side split core outer flange portion 112b have the same shape as the N pole side integral core piece main body portion 111a and the N pole side integral core outer flange portion 111b except for the axial thickness. Is formed.

  In the present embodiment, the N-pole-side integrated core 111 and the N-pole-side divided core 112 configured as described above are respectively disposed on one axial end surface of each N-pole-side integrated core piece 111A as shown in FIG. The N pole core 11 is configured by superimposing the N pole side split cores 112. If the N-pole side integrated core piece 111A and the N-pole side divided core 112 are fixed by, for example, caulking, bonding, or welding, the N-pole side integrated core 111 and the N-pole side divided core 112 are integrally formed. be able to.

Since the S pole iron core 12 has the same shape as the N pole iron core 11, a detailed description thereof will be omitted. However, as shown in parentheses in FIGS. 2 to 4, one S pole side integrated iron core 121 and four S pole irons are provided. The pole-side divided iron core 122 is configured to overlap in the axial direction.
As shown in FIG. 3, the S-pole-side integrated core 121 includes an S-pole-side integrated core piece main body 121 a, two S-pole-side integrated core pieces outer flanges 121 b, and an S-pole-side integrated core piece base end 121 c, respectively. The four S pole side iron core pieces 121A are provided, and the S pole side iron core piece 121B that connects the S pole side iron core pieces 121A radially inward.
Further, as shown in FIG. 4, the S pole side split core 122 is composed of an S pole side split core main body 122a, an S pole side split core outer flange 122b, and an S pole side split core inner flange 122c. Yes.

  As in the case of the N pole core 11, the S pole core 12 has an S pole side split core 122 on one end surface in the axial direction of each S pole side integral core piece 121 </ b> A of the S pole side integral core 121, as shown in FIG. 2. It is comprised by superimposing. If the S pole-side integrated core piece 121A and the S pole-side split core 122 are fixed by caulking, bonding, welding, or the like, the S-pole side integrated core 121 and the S pole-side split core 122 can be formed integrally. .

  Further, the inner diameter of the annular member 13 is equal to the diameters of the inner peripheral surfaces 111d and 121d of the N pole side integrated core connecting portion 111B and the S pole side integrated core connecting portion 121B, and the outer diameter thereof is the N pole side integrated core connecting portion. It is formed so that it may become equal to the diameter of the outer peripheral surfaces 111e and 121e of the part 111B and the S pole side integral iron core connection part 121B.

  In the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment, the N-pole iron core 11 and the S-pole iron core 12 configured as described above are combined via an annular member 13 as shown in FIG. The rotor core 1 is configured by being fixed integrally.

  More specifically, the core piece 12A of the S pole core 12 is positioned between the core pieces 11A of the N pole core 11 adjacent in the circumferential direction, that is, the N pole core 11 and the S pole with the annular member 13 interposed therebetween. From the state in which the one end surfaces where the N-pole side divided core 112 and the S-pole side divided core 122 are superimposed are respectively opposed to each other, the N pole core 11 is rotated in the circumferential direction, for example, so that the number of rotating machine poles is one. The rotor core 1 is configured by combining the N-pole iron core 11 and the S-pole iron core 12 and fixing them together after shifting the phase.

  As a result, the N pole side split cores 112 and the S pole side integral core pieces 121A are alternately arranged in the circumferential direction on one end face in the axial direction of the rotor 1, and the N pole side integral core is disposed on the other end face. The pieces 111A and the S pole side divided cores 122 are alternately arranged in the circumferential direction.

Here, the N-pole iron core 11 and the S-pole iron core 12 are combined via an annular member 13. As described above, the annular member 13 has an inner diameter that is the same as the inner diameter of the integral core connecting portion 111c, an outer diameter that is the same as the outer diameter of the integral core connecting portion 111c, and an axial thickness. The difference between the integral core thickness t1 and the split core thickness t2 is t3.
Therefore, the annular member 13 is disposed in a hollow portion formed on the axial center side of the N-pole side divided core 112 and the S-pole side divided core 122 so that the N-pole core 11 and the S-pole core 12 are overlapped. When they are put together, both end surfaces in the axial direction of the N-pole iron core 11 and both end surfaces in the axial direction of the S-pole iron core 12 can be arranged on the same plane.

  In the examples shown in FIGS. 1 to 5, caulking is adopted as a method of fixing the N pole side integrated core 111 and the N pole side split core 112, the S pole side integrated core 121 and the S pole side split core 122. Yes. Therefore, each of the N-pole side integrated iron core 111, the N-pole side divided iron core 112, the S-pole side integrated iron core 121, and the S-pole side divided iron core 122 includes a through hole 14 for performing caulking and fixing.

  The thus configured rotor iron core 1 is attached to the rotating machine shaft 3 through a nonmagnetic boss (not shown) at the inner diameter portion of the integral iron cores 111 and 121 or directly attached to the nonmagnetic rotating machine shaft 3. Thus, the rotational force can be transmitted to the rotating machine shaft 3 while preventing leakage of the magnetic flux of the permanent magnet.

As a specific example of a method of fastening the rotor core 1 to the rotating machine shaft 3 (or boss), the phase system when the rotor core 1 is assembled is enhanced by key fastening at the inner diameter portions of the integral cores 111 and 121. Can do.
Further, shrinkage fastening (press-fit or shrink fitting) is also possible with the inner diameter portions of the integrated iron cores 111 and 121 and the rotating machine shaft 3 (or boss).

  According to the above-described rotor structure of the permanent magnet type rotating electrical machine according to the present invention, in the XYZ triaxial orthogonal coordinate system, the different polarity of the rotor 1 in the XY plane when the axial direction is the Z direction. Since the space is divided, leakage of magnetic flux in the XY in-plane direction can be prevented.

  Further, by making the divided core thickness t2 thicker than the integral core thickness t1, leakage of magnetic flux via the axial direction between the opposing north pole side integral core 111 and south pole side integral core 121 is prevented. Can do. For this reason, it is desirable that the divided core thickness t2 is greater than the integral core thickness t1 by a distance corresponding to a distance that can secure a magnetic resistance sufficient to prevent magnetic flux leakage in the axial direction.

  Further, since the annular member 13 made of a non-magnetic material having a thickness t3 in the axial direction is incorporated between the N pole side integrated core 111 and the S pole side integrated core 121, the N pole core 11 and the S pole When the pole core 12 is in a state in which both end faces in the axial direction of the N pole core 11 and both end faces in the axial direction of the S pole core 12 are aligned on the same plane, the axial thickness of the rotor core 1 is obtained. At the same time, it is possible to avoid a short circuit of the magnetic circuit between the N pole side integrated iron core 111 and the S pole side integrated iron core 121.

  In addition, as an assembling method of the other rotor core 1 in the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment, the N pole side integrated core 111, the N pole side split core 112, and the S pole side integrated core 121 Without fixing the S pole side split core 122 in advance, as shown in FIG. 6, the N pole side integral core 111, the S pole side integral core 121, the N pole side split core 112, the S pole side split core 122, and the plate member After arranging 15 and 16, it is also possible to fix them together using the rod-like support member 17.

  Here, the plate members 15 and 16 are annular plate bodies, and the through holes 15a are formed in the same shape as the above-described through holes 14 at positions corresponding to the N pole side divided cores 112 and the S pole side divided cores 122, respectively. 16a. The rod-like support member 17 is formed in a columnar shape so as to be fitted into the through hole 14 and the through holes 15a and 16a.

If the assembly method shown in FIG. 6 and described above is used, the integrated iron cores 111 and 121 exist as compared with the conventional rotor structure using a completely divided iron core, so that the load caused by the centrifugal force acting on the divided iron cores 112 and 122 is increased. Can be dispersed, and the divided cores 112 and 122 can be held more firmly.
In contrast, in a conventional rotor structure using a fully divided core, the member that supports the split core on the rotating machine shaft (or boss) is only a plate member, and the centrifugal force acting on the split core is a round bar or the like. Since the rod-like support member and the plate member are loaded, the rod-like support member and the plate member are required to have strength and rigidity, and are divided more firmly than the rotor structure of the permanent magnet type rotating electric machine according to this embodiment. It was difficult to hold the iron core.
Note that if the N-pole side integrated core 111 and the N-pole side divided core 112, the S-pole side integrated core 121 and the S-pole side divided core 122 are fixed in advance, a rotor core with higher strength can be obtained.

  Thus, the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment can improve the assembly accuracy with the rotating machine shaft 3 as compared with the conventional fully divided core structure, and the conventional fully divided core. Compared to the structure, it has the advantage that it is easy to assemble and mass production is easy.

  Furthermore, since the leakage of magnetic flux can be prevented as compared with the conventional fully integrated iron core structure, a high gap magnetic flux density can be obtained.

  Further, if the inner diameters of the N-pole side integrated iron core 111 and the S-pole side integrated iron core 121 and the rotating machine shaft 3 (or boss) are fastened, the reliability of the fastening strength is improved.

  In the above-described embodiment, the example in which the end surface in the axial direction of the rotor core 1 is positioned using the annular member 13 is shown, but the present invention is not limited to the above-described embodiment, For example, a nonmagnetic rotating machine shaft 3 (or boss) is provided with a stepped portion, and the N pole side integrated iron core 111 and the S pole side integrated iron core 121 are abutted against the stepped portion, so that the axial direction of the rotor core 1 is increased. You may position the end surface of this.

  In the above-described embodiment, the N pole core 11 and the S pole core 12 are separately formed, and the N pole side integrated core 111 and the N pole side split core 112, the S pole side integrated core 121 and the S pole side split core are formed. Although the example formed by superimposing 122 is shown, the N pole core 11 and the S pole core 12 are not limited to the above-described configuration. For example, the N pole side integrated core 111 and the N pole side divided core 112 are used. Needless to say, various modifications can be made without departing from the spirit of the present invention, for example, the S pole-side integrated core 121 and the S pole-side split core 122 are manufactured as a single unit from the beginning with a dust core or the like.

(Applicable to rotating machines with large thickness)
A second embodiment of the rotor structure of the permanent magnet type rotating electric machine according to the present invention will be described with reference to FIGS.

  In this embodiment, a plurality of rotor cores 1 described in the first embodiment described above are stacked in the axial direction (four in this embodiment) to form a stacked rotor core (hereinafter referred to as a stacked rotor core). ) 10. That is, as shown in FIG. 7, the laminated rotor core 10 is configured by stacking four rotor cores 1 </ b> A to 1 </ b> D in the axial direction. The rotor cores 1A to 1D shown in FIGS. 7 and 8 have the same configuration as the rotor core 1 shown in FIGS. 1 to 6 and described above. Members having similar operational effects are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 8 and 9, the rotor core 1A and the rotor core 1B, the rotor core 1B and the rotor core 1C, and the rotor core 1C and the rotor core 1D are arranged mirror-symmetrically with each other in the axial direction. ing. In other words, the rotor core 1A and the rotor core 1C, and the rotor core 1B and the rotor core 1D are arranged in the same direction. A permanent magnet 2 is disposed between the N-pole iron core 11 and the S-pole iron core 12 in the circumferential direction.

  That is, the rotor core 1A and the rotor core 1B, which are adjacent to each other in the axial direction, and the rotor core 1C and the rotor core 1D are arranged so that the N-pole side integrated core pieces 111A and the S-pole side split cores 122 face each other. The rotor core 1B and the rotor core 1C are arranged such that the N pole side divided cores 112 and the S pole side integrated core pieces 121A face each other. As described above, in the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment, the integrated iron cores or the divided iron cores are arranged adjacent to each other in the axial direction in the axial direction.

  In the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment, the centrifugal force and the rotational force acting on the N pole side split core 112 and the S pole side split core 122 are the N pole side cores 111 and S, respectively. The pole-side integrated iron core 121 bears. Therefore, the strength of the fixed portion between the N-pole side integrated core 111 and the N-pole side divided core 112, the strength of the fixed portion between the S-pole side integrated core 121 and the S-pole side divided core 122, and the N-pole side integrated core 111 The integral core thickness t1 and the split core thickness t2 are determined according to the strength of the S pole side integral core 121, and the rotor cores 1 are laminated in the axial direction by the number of thicknesses required as a rotating machine, thereby obtaining a laminated type. The rotor core 10 is assumed to be configured.

  In the example shown in FIGS. 7 and 8, the method of fixing the N pole side integrated core 111 and the N pole side split core 112, the S pole side integrated core 122 and the S pole side split core 122 as in the first embodiment described above. As it adopts caulking fixing. Therefore, each of the N-pole-side integrated core 111, the N-pole-side divided core 112, the S-pole-side integrated core 122, and the S-pole-side divided core 122 includes a through-hole 14 for performing caulking and fixing.

  The laminated rotor core 10 configured in this way is attached to the rotating machine shaft 3 via a non-magnetic boss (not shown) at the inner diameter part of the N pole side integrated core 111 and the S pole side integrated core 121, or By being directly attached to the non-magnetic rotating machine shaft 3, the rotational force can be transmitted to the rotating machine shaft 3 while preventing leakage of the magnetic flux of the permanent magnet 2.

As a specific example of the method of fastening the laminated rotor core 10 to the rotating machine shaft 3 (or boss), as in the first embodiment, at the inner diameter portion of the N pole side integrated core 111 and the S pole side integrated core 121 By phase fastening, the phase accuracy when assembling the laminated rotor core 10 can be increased.
Further, shrinkage fastening (press-fit or shrink fitting) is also possible by the inner diameter portion of the N-pole side integrated core 111 and the S-pole side integrated core 121 and the rotating machine shaft 3 (or boss).

  Further, as shown in FIG. 9, similarly to the first embodiment, the N pole side integrated core 111 and the N pole side split core 112, and the S pole side integrated core 121 and the S pole side split core 122 are not fixed in advance. After the pole-side integrated core 111, the S-pole side integrated core 121, the N-pole side split core 112, the S-pole side split core 122, and the plate members 15 and 16 are arranged, they are fixed together using the rod-like support member 17. It is also possible to do.

  With the configuration shown in FIG. 9, the rod-shaped support member 17 has the N-pole side divided core 112 and the S-pole side divided core 122 only in portions corresponding to the N-pole side divided core 112 and the S-pole side divided core 122. Since a load due to centrifugal force is applied, the N pole side split core 112 and the S pole side split core 122 are centrifuged at fixed ends of the rod-shaped support member 17 and the N pole side integrated cores 111 and S pole side integrated cores 121. The stress due to the force can be dispersed, and the absolute value of the stress can be reduced as compared with a conventional rotor structure using a completely divided core.

  On the other hand, in the conventional rotor structure using a fully divided core, the stress due to the centrifugal force of all the split cores is applied between the fixed ends of the rod members that are arranged on both end surfaces in the axial direction. Therefore, the greater the thickness of the laminated rotor core, the more easily it is deflected radially outward and the stress applied to the fixed end with the plate member becomes excessive.

  The N-pole side integrated core 111 and the N-pole side divided core 112, and the S-pole side integrated core 121 and the S-pole side divided core 122 are fixed in advance to obtain a laminated rotor core 10 with higher strength. This is as described in the first embodiment.

  According to the rotor structure of the permanent magnet type rotating electrical machine according to the above-described embodiment, in addition to preventing leakage of magnetic flux passing through the axial direction, the rotor core 1 described in Embodiment 1 is combined with one rotor core 1. As a unit, the required strength of the single unit may be examined, and a rotor structure that does not depend on the required core thickness of the rotating machine in strength can be obtained. In other words, since the strength and rigidity of the entire laminated rotor core 10 do not depend on the number of laminated layers of the rotor core 1, as long as the rotor core 1 satisfies the required strength, the laminated rotor core 10 as a whole is required. The required strength can be obtained.

  Thus, when applied to a rotating machine having a large core thickness, the rotor core 1 shown in FIG. 1 and described above can be handled as one unit, and the number of units can be increased. Since the N pole side integrated iron core 111 and the S pole side integrated iron core 121 are also increased within the stacking thickness, the fastening strength with the rotating machine shaft 3 can also be increased. That is, since the dependence of the strength and rigidity of the rod-like support member 17 on the stack thickness of the rotor core 1 is low, it is possible to easily cope with an electric motor having a large stack thickness.

(Improvement of gap magnetic flux density)
A third embodiment of the rotor structure of the permanent magnet type rotating electric machine according to the present invention will be described with reference to FIGS. 10 and 11.

  As shown in FIG. 10, the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment is the same as the rotor structure of the permanent magnet type rotating electric machine according to the second embodiment described above. It is magnetized in the radial direction in the gap formed between the south pole side integral core connecting portion 121B and the gap formed between the north pole side integral core connecting portion 111B and the south pole side split core 122. A permanent magnet 4 is provided. Other configurations are the same as those of the rotor structure of the permanent magnet type rotating electric machine according to the second embodiment described above. Hereinafter, the same reference numerals are given to the members having the same functions and effects, and the overlapping description is omitted. Omitted.

  Here, as explained in the second embodiment, in the rotor structure of the permanent magnet type rotating electric machine according to the present embodiment, the N pole side integrated iron core 111, the S pole side integrated iron cores 121 in the axial direction, or The N pole side split cores 112 and the S pole side split cores 122 are arranged adjacent to each other.

  Therefore, in this embodiment, as shown in FIG. 11, the split cores (N pole side split cores 112 in FIG. 11) and the integral core connecting portions (in FIG. 11, S pole side integral core connecting portions 121B) located at both ends in the axial direction. The permanent magnet 4 (hereinafter referred to as the first permanent magnet 41) disposed in the gap between the first and second magnets has an axial thickness t 2, while the poles on the N-pole side split core 112 and the S-pole are not provided at both ends in the axial direction. Since the two side-divided cores 122, the N-pole side integrated core connecting part 121B, and the S-pole side integrated core connecting part 111B are adjacent to each other in the axial direction, the N-pole side split core 112 and the N pole The permanent magnet 4 (hereinafter referred to as the second permanent magnet 42) disposed in the gap formed between the side-integrated core connecting portion 121B or the S-pole-side split core 122 and the N-pole-side integrated core connecting portion 111B is a shaft. The thickness in the direction is t2 × 2.

  When the rotor is formed by laminating a plurality of rotor cores 1 as in the present embodiment, the rotor core 1 described in the first embodiment is regarded as one unit, and a permanent magnet is formed in the process of laminating each unit. 4 (41 or 42) may be sequentially incorporated.

  According to the rotor structure of the permanent magnet type rotating electric machine according to the above-described embodiment, the N pole side split core 112 and the N pole side integral core connecting portion 121B, or the S pole side split core 122 and the N pole side integral core connection. By arranging the permanent magnet 4 (41 or 42) magnetized in the radial direction in the gap formed between the portion 111B and the inner and outer diameters of the permanent magnet 2 as shown by arrows in FIG. Since the magnetic circuit by the rotor core 10 exists in the part, the gap magnetic flux density can be effectively improved while providing the fastening strength between the rotor core 10 and a rotating machine shaft (or boss) (not shown).

  In this embodiment, in the rotor structure of the permanent magnet type rotating electric machine according to the second embodiment described above, the N pole side split core 112 and the N pole side integral core connecting portion 121B or the S pole side split core 122 are used. Although the example which arrange | positions the permanent magnet 4 magnetized by radial direction in the gap | interval of N pole side integral iron core connection part 111B was shown, this invention is not limited to the Example mentioned above, for example, In the rotor structure of the permanent magnet type rotating electric machine according to the first embodiment described above, the N pole side split core 112 and the N pole side integral core connecting portion 121B, or the S pole side split core 122 and the N pole side integral core connecting portion. Needless to say, various modifications can be made without departing from the spirit of the present invention, such as disposing the permanent magnet 4 magnetized in the radial direction in the gap with 111B.

  The present invention is suitable for application to a rotor structure of a permanent magnet type rotating electrical machine.

1, 1A to 1D, 10 Rotor core 2 Permanent magnet 3 Rotating machine shaft 4 Permanent magnet 11 N pole core 11A Iron core piece 12 S pole iron core 12A Iron core piece 41 First permanent magnet 42 Second permanent magnet 111 N pole side integrated iron core 111A N pole side integral core piece 111B N pole side integral core piece connecting portion 111a N pole side integral core piece main body portion 111b N pole side integral iron core outer flange part 111c N pole side integral core piece base end 111d N pole side integral core piece connecting portion Periphery 111e N pole side integrated core outer periphery 112 N pole side split core 112a N pole side split core body 112b N pole side split core outer flange 112c N pole side split core inner flange 121 S pole side core 121A S S pole side integral core piece 121B S pole side integral core piece connection part 121a S pole side integral core piece main body part 121b S pole side integral core outer flange part 1 1c S pole side integrated core one end 121d S pole side integrated core connecting part inner periphery 121e S pole side integrated core connecting part outer periphery 122 S pole side split core 122a S pole side split core body part 122b S pole side split core outer flange 122c S pole side split core inner flange

Claims (5)

In the rotor structure of a permanent magnet type rotating electrical machine having a configuration in which a rotor core and permanent magnets are alternately arranged in the circumferential direction,
The rotor core is composed of a plurality of integral core pieces arranged at every other pole in the circumferential direction, and an integral core consisting of an integral core connecting portion that integrally connects the plurality of integral core pieces radially inward, and An N-pole iron core and an S-pole iron core each composed of a plurality of divided iron cores respectively superimposed on one axial end surface of the plurality of integral iron core pieces;
The N pole iron core and the S pole iron core are combined such that the one end surfaces in the axial direction face each other and the N pole iron core and the S pole iron core are alternately arranged in the circumferential direction. The rotor structure of the permanent magnet type rotating electric machine characterized by the above. Compared to the axial thickness of the integral iron core, the axial thickness of the divided core is configured to be thicker by a predetermined thickness that is equal to or more than a distance that can secure a magnetic resistance that prevents magnetic flux leakage in the axial direction. The rotor structure of the permanent magnet type rotating electric machine according to claim 1. The rotor structure of the permanent magnet type rotating electric machine according to claim 2, wherein an annular member having the predetermined thickness is interposed between the N pole iron core and the S pole iron core in the axial direction. . The rotor structure of the permanent magnet type rotating electric machine according to any one of claims 1 to 3, wherein a plurality of the rotor cores are laminated in an axial direction. The rotor core has a gap between the integral core connecting portion and the split core with respect to the radial direction;
The rotor structure of the permanent magnet type rotating electric machine according to any one of claims 1 to 4, wherein another permanent magnet magnetized in a radial direction is disposed in the gap.

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