JP2005312150A - Laminated core of rotor for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated core of a rotor for a rotary electric machine which can reduce an operating force generated due to the eccentricity of a rotor core plate. <P>SOLUTION: The laminated core 1 includes half laminated core parts 19A, 19B, a rotational shaft 71, and bearings 72A, 72B. The half laminated core parts 19A, 19B obtain total two core board laminate blocks 14, 15 in which a rotor core board 8 is shifted 180 degrees from each other by laminating the rotor core boards 8 in the direction of board thickness, and the length of rotor core board 18 corresponds to that obtained by dividing the half of predetermined core length L into further two equally. The core board laminate blocks 14, 15 are combined to be symmetrical at the laminate/arranged position with respect to the plane Y-Y which is the contact surface, in which the end surfaces are mutually contacted in the center of the core length L. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated core of a rotor for a rotating electric machine in which a plurality of rotor core plates made of a magnetic thin plate material are laminated in the thickness direction of the rotor core plate.

In a laminated core of a rotor for a rotating electrical machine of the prior art in which a plurality of rotor core plates made of magnetic thin plate material are laminated in the thickness direction of the rotor core plate, the eccentricity and thickness of the inner and outer diameters of the rotor core plate are obtained. In order to deal with the problem of unbalanced laminated iron cores caused by non-uniformity of the cores, a configuration in which a plurality of rotor iron core plates are divided into two at half of a predetermined iron core length and combined with each other shifted by 180 degrees is adopted. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 51-1441 (Page 2)

In the above-described laminated iron core of a rotor for a rotating electrical machine according to the prior art, the problem of unbalanced laminated iron core caused by uneven thickness of the magnetic thin plate material can be dealt with considerably. The effect of the unbalanced moment caused by the eccentricity between the center position of the inner diameter of the rotor core and the center position of the outer diameter, which is generated in the process of obtaining the rotor core plate, cannot be sufficiently dealt with. The unbalanced moment of the laminated core of the rotor for a rotating electrical machine is equivalent to the product of the weight of the laminated core and the amount of eccentricity. As a result, a centrifugal force f is generated on the rotor when the rotating electrical machine rotates. Problems such as vibration are generated in the rotor and the rotating electrical machine using the rotor. The action caused by the unbalanced moment generated in the laminated iron core of the rotor for a rotary electric machine of the conventional example due to the eccentricity will be described with reference to FIGS.
Here, FIG. 8 is an explanatory view for explaining the schematic configuration of a laminated core of a rotor for a rotary electric machine of a conventional example and the action caused by an unbalanced moment, and FIG. 9 shows a rotary electric machine of a different conventional example. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of a rotor for a rotor and the unbalance moment which generate | occur | produces in this cause. 8 and 9, 9A and 9B are conventional laminated cores, 71 is a rotating shaft of the laminated cores 9A and 9B (indicated by solid lines XX in FIGS. 8 and 9), and 72A and 72B are laminated cores. 9A and 9B are bearings that support the rotating shaft 71 on the outer side in the stacking direction of the rotor core plates, and are support points for supporting the stacked cores 9A and 9B in this case. The laminated iron cores illustrated in FIGS. 8 and 9 are so-called inner rotor type laminated iron cores.

The rotor core plates of the laminated cores 9A and 9B are generally manufactured by punching a magnetic thin plate material such as an electromagnetic steel plate with a press die. If the press mold station that pulls out the outer diameter of the rotor core plate and the press mold station that pulls out the inner diameter of the rotor core plate are different during this punching operation, the center position of the outer diameter of the rotor core plate An eccentricity corresponding to the sum of the positioning accuracy of each press die and the positioning accuracy when the magnetic thin plate material is transported to the press die installation position occurs between the center positions of the inner diameters. This amount of eccentricity is called the amount of eccentricity e. FIGS. 8 and 9 are used for the forces Fa and Fb acting on the bearings 72A and 72B by the unbalanced moment generated in the laminated cores 9A and 9B produced by laminating the rotor core plates having the eccentricity e. I will explain.
First, in the conventional example shown in FIG. 8, a half laminated core portion 91 obtained by dividing a plurality of rotor core plates into two at half of a predetermined core length L (shown as 2L / 4 in FIG. 8). , 92 are combined by shifting 180 degrees from each other, and the rotor core for rotating electrical machines having the contents according to “Patent Document 1” 9A. In FIG. 8, a is the distance between the end surface of the laminated core 9A on the half laminated core 91 side and the center of the bearing 72A, and b is the end surface of the laminated core 9A on the half laminated core 92 side and the center of the bearing 72B. This is the distance from the part. The forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate in the laminated core 9A are based on the balance of moments with the bearings 72A and 72B as fulcrums with reference to FIG. Ask for it.

However, the centrifugal force f generated due to the eccentricity e is meω ² (where m is the mass of the object (in this case, the half laminated core portions 91 and 92), and ω is the rotation speed of the object. Is the angular velocity according to }, The position where the centrifugal force f acts on the half laminated core portions 91 and 92 is the center position of the half laminated core portions 91 and 92 in the core length L direction, and the direction in which the centrifugal force f acts is shown in FIG. Assume that the half laminated core portions 91 and 92 are indicated by arrows. First, equation (1-1) is obtained from the relationship of balance of moments with the bearing 72B as a fulcrum.

(Equation 1)
Fa (a + L + b) -f (b + 3L / 4) + f (b + L / 4) = 0
…………………………… (1-1) The terms including f in the equation (1-1) are collected and transferred to the right side to obtain the equation (1-2). Formula (1-3) is obtained by arranging -2) with respect to force Fa.

(Equation 2)
Fa (a + L + b) = f (L / 2) (1-2) ∴ Fa = fL / {2 (a + L + b)} (1- 3)
Next, Expression (1-4) is obtained from the relationship of balance of moments with the bearing 72A as a fulcrum.

(Equation 3)
Fb (a + L + b) -f (a + L / 4) + f (a + 3L / 4) = 0
…………………………… (1-4) After summing up the terms including f in Equation (1-4), the terms are moved to the right side to obtain Equation (1-5). If (-5) is rearranged for Fb, equation (1-6) is obtained.

(Equation 4)
Fb (a + L + b) = − f (L / 2) (1-5)
Ｆ Fb = −fL / {2 (a + L + b)} ………………………… (1-6)
From the formula (1-3) and the formula (1-6), in the laminated core 9A using the rotor core plate having the eccentricity amount e, although it has the configuration content according to “Patent Document 1”, It can be seen that forces Fa and Fb having values according to the equations (1-3) and (1-6) act on the bearings 72A and 72B, respectively, due to the unbalanced moment caused by the eccentricity e.
Further, in the conventional example shown in FIG. 9, the construction method according to “Patent Document 1” produced by combining α rotor core plates 8 with each other being shifted 180 degrees from each other is thoroughly implemented. It is the laminated iron core 9B of the rotor for rotary electric machines which has the structure content. In FIG. 9, a is the distance between the end face of the laminated core 9B on the bearing 72A side and the center part of the bearing 72A, and b is the distance between the end face of the laminated core 9B on the bearing 72B side and the center part of the bearing 72B. . The forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate 8 in the laminated core 9B are based on the balance of moments with the bearings 72A and 72B as fulcrums with reference to FIG. Ask for it.

  However, the centrifugal force f generated due to the eccentricity e is the same as that of the laminated core 9A except that the object is the individual rotor core plate 8, and the centrifugal force f acts. The position is the center position of the thickness of each rotor core plate 8, and the direction in which the centrifugal force f acts is as indicated by the arrows in each rotor core plate 8 in FIG. First, Expression (2-1) is obtained from the relationship of balance of moment with the bearing 72B as a fulcrum. In the formula (2-1) and the like, L / (2α) is abbreviated as ΔL.

(Equation 5)
Fa (a + L + b) −f (b + L−ΔL) + f (b + L−3ΔL)
−f (b + L−5ΔL) + f (b + L−7ΔL)
...- f {b + L- (2α-3) ΔL}
+ F {b + L- (2α-1) ΔL} = 0
…………………………… (2-1) After summing up the terms including f in Equation (2-1), the terms are transferred to the right side to obtain Equation (2-2). Formula (2-3) is obtained by arranging -2) with respect to force Fa.

(Equation 6)
Fa (a + L + b) = f (2ΔL × α) = fL (2−2) ∴ Fa = fL / (a + L + b) (2−3)
Next, the force Fb acting on the bearing 72B is expressed by the equation (2) according to the same procedure as in the equations (2-1) to (2-3) based on the moment balance relationship with the bearing 72A as a fulcrum. -4).

(Equation 7)
Fb = −fL / (a + L + b) (2-4)
From the formulas (2-3) and (2-4), in the laminated core 9B using the rotor core plate 8 having the eccentricity e, the forces Fa and Fb acting on the bearings 72A and 72B are the same as those of the laminated core 9A. It turns out that it is doubled in contrast. Thus, in the conventional laminated cores 9A and 9B, when the rotor core plate 8 having the eccentricity e is used, forces Fa and Fb acting on the support points such as the bearings 72A and 72B are generated. This causes problems such as the generation of vibrations in the iron cores 9A and 9B and the rotating electric machine using these. Accordingly, an object of the present invention is to provide a laminated core of a rotor for a rotating electrical machine capable of reducing the acting force generated due to the eccentricity of the rotor core plate.

In the present invention, the aforementioned object is
1) In a laminated core of a rotor for a rotating electrical machine in which a plurality of rotor core plates made of magnetic thin plate material are laminated in the thickness direction of the rotor core plate,
The plurality of rotor core plates are divided approximately equally by a division number of 2N (N is a natural number of 1 or more) every half and the respective core plate lamination blocks laminated in the thickness direction are alternately shifted by 180 degrees. The two half-laminated cores that are formed are positioned symmetrically with respect to the plane parallel to the end faces that are located on the end face in the stacking direction of the rotor core plates that are in contact with each other or confronted with each other. Combined in, or
2) In the means described in item 1 above, the number of iron core laminated blocks of 4n (n is a natural number of 1 or more) equal to or less than the number of divisions 2N is adjacent to each other. A plane in which the unit laminated core pairs composed of two iron core laminated blocks shifted by 180 degrees from each other are positioned at a position where the end faces of the rotor iron core in the laminating direction abut or face each other and are parallel to the end faces With respect to each other in a mutually symmetrical relationship, and / or
3) In the means described in the item 1, the division number 2N is two.

In the laminated core of the rotor for a rotating electrical machine machine according to the present invention, the following effects can be obtained by adopting the configuration described in the section for solving the above-mentioned problems.
(1) By adopting the configuration according to item (1) of the means for solving the above-mentioned problems, the laminated core according to the present invention uses the rotor core plate 8 having the eccentric amount e, while maintaining the eccentric amount e. The resulting unbalanced moment is configured as a couple within each of the half-laminated cores, and the two half-laminated iron cores are combined in a plane-symmetrical relationship with respect to a plane parallel to the end surface where they abut or face each other. By doing so, it is possible to cancel the couples of the respective half laminated iron core portions. As a result, the force resulting from the eccentricity e acting on the bearing that supports the rotating shaft on which the laminated iron core is mounted can theoretically be reduced to zero. Also,
(2) By adopting the configuration according to the item (2) of the means for solving the problems, the number of 4n of each of the half-laminated cores is maintained while maintaining the effect of the item (1) as it is. The unbalanced moment generated as a whole can be theoretically reduced to zero even for the part related to the iron core laminated block. Furthermore,
(3) By adopting the configuration according to the item (3) of the means for solving the problems, the effect of the item (1) is maintained as it is, and the iron core plate laminated block constituting the laminated iron core is maintained. Since the total number can be reduced to four, it is possible to reduce the manufacturing cost of the laminated core that can achieve the effect of the item (1).

The best mode for carrying out the present invention will be described below in detail with reference to the drawings. In the following description, the same parts as those in the laminated iron core of the conventional rotating electrical machine rotor shown in FIGS. 8 and 9 are denoted by the same reference numerals, and the description thereof is omitted.
Embodiment 1 FIG. 1 is an explanatory view for explaining the schematic structure of a laminated core of a rotor for a rotating electrical machine according to an example of an embodiment of the present invention and the action caused by an unbalanced moment. In FIG. 1, reference numeral 1A denotes a laminated core of a rotor for a rotating electric machine according to the present invention comprising half laminated core portions 11A and 11B, a rotating shaft 71, and bearings 72A and 72B. In this case, each of the half laminated core portions 11A and 11B further divides the rotor core plate 8 corresponding to half of the predetermined core length L into approximately four equal parts, and this number of the rotor core plates 8 is divided. A total of four iron core plate lamination blocks 14 and 15 obtained by laminating in the plate thickness direction are laminated and arranged in such a relationship that the rotor iron core plates 8 are shifted from each other by 180 degrees.

Therefore, each of the two core plate lamination blocks 14 and 15 has a lamination length of the rotor core plate 8 of approximately L / 8 in this case, and the position of the eccentricity e is opposite to the rotation shaft 71. At the same time, they are alternately stacked and arranged in the direction of the iron core length L. Further, each of the half laminated core portions 11A and 11B is a substantially central portion of the iron core length L (shown as L / 2 in FIG. 1), and the end surfaces in the lamination direction of the rotor core plate 8 are brought into contact with each other and combined. In this case, the laminated and disposed positions of the iron core plate laminated blocks 14 and 15 are combined in a plane symmetry with respect to a plane YY (indicated by a one-dot chain line in FIG. 1) that matches the contact surface. ing.
FIG. 1 shows the forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate 8 for the laminated core 1A of the rotor for a rotary electric machine according to the present invention having the above-described configuration. As in the case of the conventional example, it is obtained based on the balance of moments with bearings 72A and 72B as fulcrums. First, Expression (3-1) is obtained from the relationship of balance of moments with the bearing 72B as a fulcrum.

(Equation 8)
Fa (a + L + b) -f (b + 15L / 16) + f (b + 13L / 16)
-F (b + 11L / 16) + f (b + 9L / 16)
+ F (b + 7L / 16) -f (b + 5L / 16)
+ F (b + 3L / 16) -f (b + L / 16) = 0
…………………………… (3-1) After summing up the terms including f in the equation (3-1), the term is moved to the right side to obtain the equation (3-2). Formula (3-3) is obtained by arranging -2) with respect to the force Fa.

(Equation 9)
Fa (a + L + b) = f (2L-2L) = 0 …………………… (3-2) ∴ Fa = 0 ………………………… (3-3)
Next, the force Fb acting on the bearing 72B is expressed by the following equation (3) according to the same procedure as in the equations (3-1) to (3-3) based on the moment balance relationship with the bearing 72A as a fulcrum. -4).

(Equation 10)
Fb = 0 ………………………… (3-4)
From the equations (3-3) and (3-4), the laminated core 1A according to the present invention is different from the conventional laminated cores 9A and 9B in using the rotor core plate 8 having the eccentricity e. It can be seen that the forces Fa and Fb resulting from the eccentricity e do not theoretically act on 72A and 72B. As a matter of course, there is an unbalanced moment due to the eccentric amount e in each of the iron core plate laminated blocks 14 and 15, but in the laminated iron core 1A, as described above, each of the half laminated iron core portions 11A and 11B. By configuring, the unbalanced moment is configured as a couple within each of the half laminated core portions 11A and 11B, and the half laminated core portions 11A and 11B are in plane symmetry with respect to the plane YY as described above. In combination, the half-laminated iron core portions 11A and 11B can be obtained by canceling out the couples of each other. In the laminated core 1A, the influence of the non-uniform thickness of the laminated core caused by the non-uniform thickness of the magnetic thin plate material is canceled for the non-uniform thickness of the sheet existing in the direction parallel to the eccentricity e. be able to.
[Embodiment 2] FIG. 2 is an explanatory view for explaining the schematic structure of a laminated core of a rotor for a rotating electrical machine according to a different example of the embodiment of the present invention and the action caused by an unbalanced moment generated therein. In addition, in the following description including the term after "Embodiment 3" of a postscript, the same code | symbol is attached | subjected to the same part as the laminated iron core 1A of the rotor for rotary electric machines by this invention shown in FIG. The description is omitted. In FIG. 2, 1B is the laminated core of the rotor for rotary electric machines by this invention provided with half laminated core part 11C, 11D, the rotating shaft 71, and bearing 72A, 72B.

In the case of this example, each of the half laminated core portions 11C and 11D further divides the rotor core plate 8 corresponding to half of the predetermined core length L into approximately four equal parts, A total of four core plate laminate blocks 14 and 15 obtained by laminating in the plate thickness direction form unit laminate core pairs 12A and 12B with a pair of core plate laminate blocks 14 and 15 adjacent to each other. ing. In this case, the lamination length of the rotor core plate 8 of each of the iron core plate lamination blocks 14 and 15 is approximately L / 8.
In the case of the unit laminated core pairs 12A and 12B belonging to the half laminated iron core portion 11C, the iron core plate laminated block 14 is laminated and disposed on the bearing 72A side in the unit laminated iron core pair 12A, but in the unit laminated iron core pair 12B, the bearing 72B. An iron core laminated block 14 is laminated and disposed on the side. Thus, in this example, the iron core plate laminated block 15 of the unit laminated iron core pair 12A and the iron core plate laminated block 15 of the unit laminated iron core pair 12B are the core length L / of the half laminated iron core portions 11C and 11D. 2, the end faces in the stacking direction of the rotor core plates 8 are brought into contact with each other (combined with L / 4 in FIG. 2).

At that time, the laminated and disposed positions of the iron core plate laminated blocks 14 and 15 are combined with each other so as to be symmetrical with respect to a plane Ys-Ys (indicated by a one-dot chain line in FIG. 2) matching the contact surface. Then, in the laminated core 1B according to the present invention, the plane core Y is combined with the iron core plate laminated blocks 14 and 15 in the respective half laminated core portions 11C and 11D as described above, as in the laminated core 1A according to the present invention. With respect to −Y, the core plate laminated blocks 14 and 15 are combined in such a manner that the lamination / arrangement positions are symmetrical with each other.
FIG. 2 shows the forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate 8 for the laminated core 1B of the rotor for a rotating electrical machine according to the present invention having the above-described configuration. As in the case of “Embodiment 1”, reference is made based on the moment balance with bearings 72A and 72B as fulcrums. First, Expression (4-1) is obtained from the relationship of balance of moments with the bearing 72B as a fulcrum.

(Equation 11)
Fa (a + L + b) -f (b + 15L / 16) + f (b + 13L / 16)
+ F (b + 11L / 16) -f (b + 9L / 16)
-F (b + 7L / 16) + f (b + 5L / 16)
+ F (b + 3L / 16) -f (b + L / 16) = 0
…………………………… (4-1) After summing up the terms including f in the equation (4-1), the terms are transferred to the right side to obtain the equation (4-2). Formula (4-3) is obtained by arranging -2) with respect to the force Fa.

(Equation 12)
Fa (a + L + b) = f (2L-2L) = 0 …………………… (4-2) ∴ Fa = 0 ………………………… (4-3)
Next, the force Fb acting on the bearing 72B is expressed by the following equation (4) according to the same procedure as the equations (4-1) to (4-3) based on the moment balance relationship with the bearing 72A as a fulcrum. -4).

(Equation 13)
Fb = 0 ………………………… (4-4)
From the formulas (4-3) and (4-4), the laminated core 1B according to the present invention uses the rotor core plate 8 having the eccentricity e in the same manner as the laminated core 1A according to the present invention, while bearings 72A and 72B. It can be seen that the forces Fa and Fb resulting from the eccentricity e do not act theoretically. This is described in “Embodiment 1” according to the characteristic configuration of the present invention in which the core plate laminated blocks 14 and 15 of the half laminated iron core portions 11C and 11D are combined in a plane symmetry with respect to the plane YY. In the laminated iron core 1B, in addition to this, the half laminated iron core portions 11C and 11D are configured as described above in addition to this. This contributes to improving the safety related to the unbalanced moment caused by the eccentricity e.

That is, in the laminated core 1B, the unbalanced moment resulting from the eccentricity e of the rotor core plate 8 is configured as a couple within the unit laminated core pair 12A and the unit laminated core pair 12B, and the unit laminated core pairs 12A and 12B are formed. As described above, the couples of the unit laminated core pairs 12A and 12B cancel each other out by combining each other in a plane-symmetrical relationship with respect to the plane Ys-Ys. As a result, the unbalanced moment generated in each of the half laminated core portions 11C and 11D is set to zero. From this point as well, in the laminated core 1B, the bearings 72A and 72B are caused by the eccentricity e. The forces Fa and Fb do not act theoretically.
Furthermore, the fact that the unbalanced moment generated in each of the half laminated core portions 11C and 11D is made zero is that the rotation shaft 71 of the portion where the respective half laminated core portions 11C and 11D are mounted has Since an unbalanced moment due to the eccentric amount e is not applied, it is effective for enhancing the safety related to the mechanical strength of the rotating shaft 71. Note that the laminated iron core 1B is effective against the problem of unbalanced laminated iron cores due to the uneven thickness of the magnetic thin plate material as in the case of the laminated iron core 1A.
[Embodiment 3] FIG. 3 is an explanatory view for explaining the schematic structure of a laminated core of a rotor for a rotating electric machine according to a different example of the embodiment of the present invention and the action caused by an unbalanced moment. In the following description, the same parts as those in the laminated core 1B of the rotor for a rotary electric machine according to the present invention shown in FIG. Further, in the drawings used for the following description, only representative symbols may be written for the symbols given in FIGS.

  In FIG. 3, reference numeral 1C denotes a laminated core of a rotor for a rotating electrical machine according to the present invention, which includes half laminated core portions 11E and 11F, a rotating shaft 71, and bearings 72A and 72B. In this case, each of the half laminated core portions 11E and 11F further divides the rotor core plate 8 corresponding to a half of the predetermined core length L into approximately six equal parts, and this number of the rotor core plates 8 is divided into six. The above-mentioned half laminated core part 11C is used by using four of a total of six iron core board laminated blocks (having the same contents as the iron core laminated blocks 14 and 15) obtained by laminating in the plate thickness direction. , 11F, the partially laminated iron core portion 13 having the same configuration content is formed. Further, the above-mentioned unit laminated core pair 12B is constituted by the remaining two iron core plate laminated blocks among the total of six iron core plate laminated blocks respectively possessed by the half laminated iron core portions 11E and 11F. Therefore, each of the half laminated core portions 11E and 11F is arranged by sequentially combining the partially laminated core portion 13 and the unit laminated core pair 12B, and the rotor on the side opposite to the partially laminated core portion 13B of the unit laminated core pair 12B. The end faces in the stacking direction of the iron core plates 8 are brought into contact with each other and are combined. At this time, the stacking / arrangement of the iron core plate stacking blocks with respect to the plane YY (shown by a one-dot chain line in FIG. 3) matching the contact surfaces. The installation positions are combined so as to be plane-symmetric with each other.

  FIG. 3 shows the forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate 8 for the laminated core 1C of the rotor for a rotary electric machine according to the present invention having the above-described configuration. As in the case of “Embodiment 1”, reference is made based on the moment balance with bearings 72A and 72B as fulcrums. First, Expression (5-1) is obtained from the relationship of balance of moments with the bearing 72B as a fulcrum.

(Equation 14)
Fa (a + L + b) -f (b + 23L / 24) + f (b + 21L / 24)
+ F (b + 19L / 24) -f (b + 17L / 24)
+ F (b + 15L / 24) -f (b + 13L / 24)
-F (b + 11L / 24) + f (b + 9L / 24)
-F (b + 7L / 24) + f (b + 5L / 24)
+ F (b + 3L / 24) -f (b + L / 24) = 0
…………………………… (5-1) After summing up the terms including f in Equation (5-1), the terms are moved to the right side to obtain Equation (5-2). When formulating -2) with respect to force Fa, formula (5-3) is obtained.

(Equation 15)
Fa (a + L + b) = f (3L-3L) = 0 …………………… (5-2) ∴ Fa = 0 ………………………… (5-3)
Next, the force Fb acting on the bearing 72B is expressed by the equation (5) according to the same procedure as in the equations (5-1) to (5-3) based on the moment balance relationship with the bearing 72A as a fulcrum. -4).

(Equation 16)
Fb = 0 ………………………… (5-4)
Next, a laminated core of a rotor for a rotating electric machine according to a different example of the embodiment of the present invention will be described with reference to FIG. Here, FIG. 4 is an explanatory diagram for explaining the schematic configuration of the laminated core of the rotor for a rotating electric machine according to a different example of the embodiment of the present invention and the action caused by the unbalanced moment generated therein. In FIG. 4, 1D is replaced with a unit laminated core pair 12 </ b> B disposed independently of the partial laminated core portion 13 with respect to the laminated iron core 1 </ b> C of the rotor for a rotating electrical machine according to the present invention shown in FIG. 3. This is a laminated core of a rotor for a rotating electrical machine in which the unit laminated core pair 12A is used.

  FIG. 4 shows the forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate 8 for the laminated core 1D of the rotor for a rotating electrical machine according to the present invention having the above-described configuration. As in the case of “Embodiment 1”, reference is made based on the moment balance with bearings 72A and 72B as fulcrums. First, Expression (6-1) is obtained from the relationship of balance of moments with the bearing 72B as a fulcrum.

(Equation 17)
Fa (a + L + b) -f (b + 23L / 24) + f (b + 21L / 24)
+ F (b + 19L / 24) -f (b + 17L / 24)
-F (b + 15L / 24) + f (b + 13L / 24)
+ F (b + 11L / 24) -f (b + 9L / 24)
-F (b + 7L / 24) + f (b + 5L / 24)
+ F (b + 3L / 24) -f (b + L / 24) = 0
…………………………… (6-1) After summing up the terms including f in Equation (6-1), the terms are moved to the right side to obtain Equation (6-2). Formula (6-3) is obtained by arranging -2) with respect to force Fa.

(Equation 18)
Fa (a + L + b) = f (3L-3L) = 0 …………………… (6-2) ∴ Fa = 0 …………………… (6-3)
Next, the force Fb acting on the bearing 72B is expressed by the following equation (6) according to the same procedure as in the equations (6-1) to (6-3) based on the moment balance relationship with the bearing 72A as a fulcrum. -4).

(Equation 19)
Fb = 0 ………………………… (6-4)
The laminated iron cores 1C and 1D of the rotor for a rotating electric machine have a configuration in which the laminated iron core 1B and a pair of laminated iron core plates of the laminated iron core 1A are combined. The calculation results obtained by the equations (5-3), (5-4), (6-3), and (6-4) are almost in the center in the stacking direction of the rotor core plate 8 even in such a configuration. If it is a laminated core in which the laminated and disposed positions of the rotor core plate 8 are symmetrical with respect to the plane YY (shown by a one-dot chain line in FIGS. 3 and 4), the amount of eccentricity e is This shows that the forces Fa and Fb resulting from the eccentricity e do not theoretically act on the bearings 72A and 72B even if the rotor core plate 8 having the same is used.

Further, if the calculation result shows that the lamination and arrangement positions of the rotor core plates 8 are plane-symmetric with respect to the plane Y-Y, the pair of core plate lamination blocks combined with the lamination core 1B is It has been shown that the same operation and effect can be achieved regardless of whether the unit laminated core pair 12A has the configuration contents or the unit laminated core pair 12B. It is to be noted that the laminated cores 1C and 1D are effective against the problem of unbalanced laminated iron cores due to the uneven thickness of the magnetic thin plate material, as in the case of the laminated iron core 1A.
[Embodiment 4] FIG. 5 is an explanatory view for explaining the schematic structure of a laminated core of a rotor for a rotating electric machine according to still another example of the embodiment of the present invention and the action caused by an unbalanced moment generated therein. 6 is an explanatory view for explaining an example of a method of laminating the rotor core plate of the laminated core shown in FIG. 5, and FIG. 7 is a view taken in the direction of arrow P in FIG. In FIG. 5, reference numeral 1 denotes a laminated core of a rotor for a rotating electrical machine according to the present invention, which includes half laminated core portions 19A and 19B, a rotating shaft 71, and bearings 72A and 72B. In this case, each of the half laminated core parts 19A and 19B further divides the rotor core plate 8 corresponding to half of the predetermined core length L into approximately two equal parts. In a total of two iron core plate lamination blocks 14 and 15 obtained by laminating in the plate thickness direction, the rotor core plates 8 are laminated and arranged so as to be shifted from each other by 180 degrees.

Therefore, in the iron core plate laminated blocks 14 and 15 of the half laminated iron core portions 19A and 19B, the laminated length of the rotor iron core plate 8 is approximately L / 4 in this case, and the position of the eccentricity e is The rotary shafts 71 are positioned opposite to each other and are alternately stacked and disposed in the direction of the iron core length L. Further, each of the half laminated core portions 19A and 19B is a substantially central portion of the core length L (shown as L / 2 in FIG. 5), and the end faces in the lamination direction of the rotor core plate 8 are brought into contact with each other and combined. In this case, the laminated and disposed positions of the iron core laminated blocks 14 and 15 are combined with each other so as to be symmetrical with respect to a plane YY (indicated by a one-dot chain line in FIG. 5) that matches the contact surface. ing.
FIG. 5 shows the forces Fa and Fb acting on the bearings 72A and 72B due to the eccentricity e of the rotor core plate 8 for the laminated core 1 of the rotor for a rotating electrical machine according to the present invention having the above-described configuration. As in the case of “Embodiment 1”, reference is made based on the moment balance with bearings 72A and 72B as fulcrums. First, Expression (7-1) is obtained from the relationship of balance of moments with the bearing 72B as a fulcrum.

(Equation 20)
Fa (a + L + b) -f (b + 7L / 8) + f (b + 5L / 8)
+ F (b + 3L / 8) -f (b + L / 8) = 0
…………………………… (7-1) After summarizing the term including f in the equation (7-1), the term is moved to the right side to obtain the equation (7-2). Formula (7-3) is obtained by arranging -2) with respect to force Fa.

(Equation 21)
Fa (a + L + b) = f (L−L) = 0 …………………… (7-2) ∴ Fa = 0 ………………………… (7-3)
Next, the force Fb acting on the bearing 72B is expressed by the equation (7) according to the same procedure as in the equations (7-1) to (7-3) based on the moment balance relationship with the bearing 72A as a fulcrum. -4).

(Equation 22)
Fb = 0 ………………………… (7-4)
The rotor core 1 of the rotor for a rotating electrical machine uses the rotor core plate 8 having the eccentric amount e, so that the unbalanced moment caused by the eccentric amount e is naturally applied to each of the core plate stacked blocks 14 and 15. However, by configuring each of the half laminated core portions 19A and 19B as described above, the unbalanced moment is configured as a couple within each of the half laminated core portions 19A and 19B. As described above, by combining the iron core portions 19A and 19B in a relation of plane symmetry with respect to the plane Y-Y, the couple of the half laminated iron core portions 19A and 19B can be canceled out.

As a result, in the laminated core 1, as shown in the equations (7-3) and (7-4), the forces Fa and Fb resulting from the eccentricity e do not theoretically act on the bearings 72A and 72B. . Therefore, the rotary electric machine using the laminated core 1 and the laminated core 1 generates vibration due to the eccentricity e of the rotor core plate 8 as in the case of the laminated cores 1A, 1B, 1C and 1D. The problem can be suppressed. Moreover, the laminated iron core 1 has the smallest total number of the iron core plate laminated blocks 14 and 15 in order to obtain the operation and effect of the invention compared with the laminated iron cores 1A, 1B, 1C and 1D according to the present invention. The cost of manufacturing can be reduced to the lowest. It is to be noted that the laminated iron core 1 is also effective for the problem of unbalanced laminated iron cores due to the uneven thickness of the magnetic thin plate material as in the case of the laminated iron core 1A.
Next, an example of a method of laminating the rotor core plate 8 of the laminated core 1 according to the present invention will be described with reference to FIGS. The lamination of the rotor core plate 8 is performed using, for example, the assembly shaft 4 or the like. In this case, the assembly shaft 4 is a cylindrical body having an outer diameter that fits with the inner diameter of the rotor core plate 8, and has a groove shape that fits with the guide body 5 relative to the outer diameter portion. Grooves 41 and 41 are formed. The guide body 5 has an isosceles trapezoidal shape in which the cross-sectional shape can be fitted with the groove 41, and has the same length as the assembly shaft 4.

Since the rotor core plate 8 is the core plate for the inner rotor type rotor as described above, a remark (not shown) used for alignment at the time of laminating the rotor core plate 8 is formed on the inner diameter portion thereof. . The shape of the remark may be, for example, a semicircular shape circumscribing the guide body 5 or an isosceles trapezoidal shape that can be slidably fitted to the guide body 5. For example, the stacking operation of the rotor core plate 8 with respect to the stacked core 1 is first started from the portion of the core plate stack block 14 of the half stack core portion 19A having a stack length of L / 4 (see FIG. See Eye]. Next, the lamination of the rotor core plate 8 in the portion of the core laminated plate block 15 of the half laminated core portion 19A and the portion of the core laminated plate block 15 of the half laminated core portion 19B is performed integrally.
The total lamination length of this portion is L / 2. Then, since it is necessary to shift the rotor core plate 8 by 180 degrees at the time of laminating this portion, the guide body 5 is once pulled out from the groove 41 and mounted again in the other groove 41. In this state, the rotor core plate 8 is stacked on a portion having a stacking length of L / 2 (see [second stage] in FIG. 6). Finally, a stacking operation is performed on the portion of the iron core plate stack block 14 of the half stack core portion 19B having a stack length of L / 4 (see [third stage] in FIG. 6). Also in this case, since it is necessary to shift the rotor core plate 8 by 180 degrees, the rotor core plate 8 is stacked after the guide body 5 is replaced with another groove 41 again.

When the operation of [third stage] in FIG. 6 is completed, the stacking operation of the rotor core plate 8 of the stacked core 1 in this case is completed. Thus, the structure of the assembly shaft 4 and the guide body 5 used in this laminating operation is inserted into a groove 41 having an isosceles trapezoid shape narrow on the outer diameter side, which is integrally processed with the assembly shaft 4. Therefore, since the guide body 5 does not come off in the radial direction of the assembly shaft 4, the remark of the rotor core plate 8 is reliably guided to the guide body 5. Thereby, the lamination | stacking operation | work of the rotor iron core board 8 is easy, and also the operation | work which laminates | stacks the rotor iron core board 8 180 degree | times becomes easy.
In order to evaluate the degree of reduction of the total unbalance moment of the laminated core 1 of the rotor for a rotary electric machine according to the present invention described above, the inventors have machined the steel material with the inner diameter and the outer diameter being decentered and are predetermined. The simulated laminated core block having the eccentricity e of the above is shrink-fitted on the rotating shaft, and the simulated core of the product of the present invention having the configuration contents of the laminated core 1 shown in FIG. 5 is manufactured and evaluated using a balance machine. Carried out. The total mass including the dimensions of the main part of the simulated iron core, the rotating shaft, and the like is 133 mm in outer diameter, 93 mm in iron core length L, and 13.4 kg in total mass. Regarding the predetermined eccentricity e, two types of 0.2 mm and 0.35 mm were prepared as the eccentricity e with respect to the rotating shaft.

  Moreover, the balance machine used for evaluation is a maker: Nagahama Manufacturing Co., Ltd. type: 20B type, test mass: 30 kg. The evaluation experiment results are shown in Table 1. The actual measurement data by the balance machine for the simulated iron core is shown in Table 1 as the actual measurement unbalance moment. The calculated unbalanced moment in Table 1 is the unbalanced moment obtained by calculating the non-countermeasured simulated iron core in which the eccentricity e is equal over the entire length of the iron core length L, that is, the countermeasure for reducing the unbalanced moment is not taken. By observing Table 1, it can be seen that the imitation iron core of the present invention can greatly reduce the unbalanced moment from about “1/30” to “1/25” compared to the non-countermeasured iron core.

(Table 1)
Table 1 Results of unbalanced moment evaluation experiment ┌─────────┬──────────┬───────────┐
│ Test object │ Calculated unbalanced moment │ Measured unbalanced moment │
[Eccentricity e (mm)] │ (g ・ mm) │ (g ・ mm) │
├─────────┼──────────┼───────────┤
│ 0.2 │ 20199.6 │ 69.4 │
├─────────┼──────────┼───────────┤
│ 0.35 │ 3534.8 │ 144.8 │
└─────────┴──────────┴───────────┘
In the above description, the rotor for a rotating electrical machine to which the laminated core according to the present invention is applied is an inner rotor type, but is not limited to this, and may be an outer rotor type, for example. In the above description, the two half laminated core portions (half laminated core portions 11A to 11H, 19A, 19B) of the laminated core according to the present invention are brought into contact with each other at the end faces in the lamination direction of the rotor core plates. However, the present invention is not limited to this, and for example, it may be a case where they face each other via an air duct or the like. Furthermore, in the above description, the laminated core 9B produced by combining the α rotor core plates 8 shown in FIG. 9 while being shifted from each other by 180 degrees is expressed by the equations (2-1) to ( As described in 2-4), it has been explained that the forces Fa and Fb acting on the bearings 72A and 72B are generated, causing problems such as the generation of vibrations in the laminated core 9B and the rotary electric machine using these. If the number of α rotor core plates 8 used is set to 4N (N is a natural number of 1 or more), the configuration according to item (1) of the “Means for Solving the Problems” of this invention In this case, the forces Fa and Fb acting on the bearings 72A and 72B can theoretically be zero.

It is explanatory drawing explaining the effect | action which the schematic structure of the lamination | stacking iron core of the rotor for rotary electric machines by an example of embodiment of this invention and the unbalance moment which generate | occur | produces in this causes. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of the rotor for rotary electric machines by a different example of embodiment of this invention and the unbalance moment which generate | occur | produces in this causes. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of the rotor for rotary electric machines by a different example of embodiment of this invention and the unbalance moment which generate | occur | produces in this causes. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of the rotor for rotary electric machines by a different example of embodiment of this invention and the unbalance moment which generate | occur | produces in this causes. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of the rotor for rotary electric machines by the further different example of embodiment of this invention and the unbalance moment which generate | occur | produces in this causes. It is explanatory drawing explaining an example of the lamination | stacking method of the rotor core board of the laminated iron core shown in FIG. FIG. 7 is a view on arrow P in FIG. 6. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of the rotor for rotary electric machines of an example of a conventional example, and the unbalance moment which generate | occur | produces in this cause. It is explanatory drawing explaining the effect | action which the schematic structure of the laminated iron core of the rotor for rotary electric machines of a different example of the past, and the unbalance moment which generate | occur | produces in this produce.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated core 14 Iron core board laminated block 15 Iron core board laminated block 19A Half laminated iron core part 19B Half laminated iron core part 71 Rotating shaft 72A Bearing 72B Bearing 8 Rotor iron core board

Claims (3)

In a laminated core of a rotor for a rotating electric machine in which a plurality of rotor core plates made of magnetic thin plate material are laminated in the thickness direction of the rotor core plate,
The plurality of rotor core plates are divided approximately equally by a division number of 2N (N is a natural number of 1 or more) every half and the respective core plate lamination blocks laminated in the thickness direction are alternately shifted by 180 degrees. The two half-laminated cores that are formed are positioned symmetrically with respect to the plane parallel to the end faces that are located on the end face in the stacking direction of the rotor core plates that are in contact with each other or confronted with each other. A laminated iron core of a rotor for a rotating electrical machine, characterized by being combined in In the laminated core of the rotor for rotating electric machines according to claim 1,
2 iron core plates adjacent to each other and shifted from each other by 180 degrees are limited to the number of 4n (n is a natural number of 1 or more) iron core plate laminated blocks equal to or less than the division number 2N. Unit laminated core pairs consisting of laminated blocks are alternately combined in a plane-symmetrical relationship with respect to a plane parallel to the end face located at a position where the end faces in the stacking direction of the rotor core plates abut or face each other. A laminated iron core for a rotor for a rotating electrical machine. In the laminated core of the rotor for rotating electric machines according to claim 1,
The laminated core of a rotor for a rotating electrical machine, wherein the number of divisions 2N is 2.

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