JP2012023910A - Magnetic core of armature and manufacturing method of the same, and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for reducing eddy current loss in a magnetic core of an armature mounted on an axial gap type rotary electric machine, the eddy current loss being caused by crossing of flux over a lamination interface of a magnetic steel sheet composing teeth mounted on the magnetic core of the armature.SOLUTION: A magnetic reluctance Mt (R) between any pair of first magnetic substances 30 adjacently laminated in a first lamination direction is made larger than a magnetic reluctance Mb (Q) between any pair of second magnetic substances 40 adjacently laminated in a second lamination direction. For example, a distance dt along the first lamination direction between any pair of the first magnetic substances 30 adjacently laminated in the first lamination direction is made longer than a distance db along the second lamination direction between any pair of the second magnetic substances 40 adjacently laminated in the second lamination direction.

Description

  The present invention relates to an armature magnetic core and a method of manufacturing the same, and more particularly to an armature magnetic core mounted on an axial gap type rotating electric machine.

  A plurality of substantially flat electromagnetic steel sheets punched into a predetermined shape are laminated in the normal direction of the surface on which the electromagnetic steel sheets extend, and an armature core mounted on an axial gap type rotating electric machine is provided. A forming technique has been proposed, and is disclosed in, for example, Patent Documents 1 to 3 listed below.

International Publication No. 03/047069 International Publication No. 03/047070 JP 2006-166679 A

  In an axial gap type rotating electric machine, a plurality of armature cores are arranged in an annular shape around a rotating shaft, and they are embedded in a back yoke at a part on one side in the rotating shaft direction. Of the armature magnetic core, when a portion embedded in the back yoke is an embedded portion and a portion not embedded in the back yoke is a winding portion, the armature winding is wound around the winding portion. Is done.

  In order to improve the space factor of the armature winding, the larger the radial distance around the rotation axis in plan view from the rotation axis direction (that is, the outer peripheral side around the rotation axis) The armature core has been proposed in which the width of the winding portion (the length in the direction perpendicular to both the radial direction and the rotation axis direction in the winding portion) is increased. When such an armature magnetic core is employed in an axial gap type rotating electric machine, the amount of magnetic flux is large on the outer peripheral side of the winding portion and the amount of magnetic flux is small on the inner peripheral side. That is, the amount of magnetic flux that flows depends on the width of the electromagnetic steel sheet in the winding portion.

  In addition, in order to improve the torque density of the rotating electric machine, the width of the field generating portion facing the armature core (the radial direction and the rotating shaft direction in the field generating portion) toward the outer peripheral side centering on the rotating shaft A field element whose length in the direction perpendicular to any of the above is increased has also been proposed.

  The magnetic flux flowing through the winding portion of the armature core flows into and out of the back yoke via the embedded portion and flows in the substantially circumferential direction at the back yoke. Since the cross-sectional area of the cross section perpendicular to the circumferential direction around the rotation axis of the back yoke is usually substantially uniform (regardless of the position in the circumferential direction), the magnetic flux density is substantially uniform in the back yoke. Since the thickness of the back yoke in the rotational axis direction is also generally uniform, the magnetic flux density of the magnetic flux flowing in the circumferential direction of the back yoke is substantially the same at the outer periphery and the inner periphery (regardless of the radial position).

  Therefore, as described above, when the amount of magnetic flux is different between the inner and outer circumferences in the winding portion, the magnetic flux flows in the radial direction between the back yoke and the winding portion where the magnetic flux amount is substantially equal on the inner and outer circumferences. As described above, the embedded part is interposed between the winding part and the back yoke to flow the magnetic flux, so that the magnetic flux flows from the outer peripheral side to the inner peripheral side across the laminated interface of the electromagnetic steel sheets in the vicinity of the embedded part. (Hereinafter, the flow of the magnetic flux across the laminated interface of the electromagnetic steel plates in this way is temporarily referred to as “boundary boundary of magnetic flux”). The crossing of magnetic flux allows the flow of magnetic flux in the normal direction of the surface of the electrical steel sheet, which generates eddy currents in the surface of the electrical steel sheet. Here, the electromagnetic steel sheet is intended to suppress the eddy current generated when the magnetic flux flows in the surface of the electromagnetic steel sheet, and therefore the iron loss (eddy current loss generated when the eddy current flows in the same surface). ) Is difficult to suppress. When eddy currents are generated in this way, the iron loss increases.

  In view of the above problems, the present invention provides a magnetic core for an armature mounted on an axial gap type rotating electric machine, wherein the magnetic flux crosses the laminated interface of the electromagnetic steel sheets forming the teeth mounted on the armature magnetic core. It aims at providing the technique which reduces the eddy current loss which arises by.

  In order to solve the above problems, the first aspect of the armature core according to the present invention faces the field element (10) as the rotor along the rotation axis (A) of the rotating electric machine (100). In the armature as a stator, teeth (22, 22a, 22b, annularly arranged around the rotation axis on one side in the axial direction (Q) parallel to the rotation axis with respect to the field element 22c) and a back yoke (24, 24a) that magnetically couples the teeth on the one side in the axial direction, the armature magnetic core (20), wherein the teeth are The longer the distance from the rotating shaft, the longer the first radial direction (Rt) around the rotating shaft in the tooth and the first width direction (Wt) perpendicular to both the axial directions. The teeth are large in the first radial direction. The back yoke is formed by laminating a plurality of first magnetic plates (30) in a first laminating direction that is substantially parallel, and the back yoke is a second magnetic plate in a second laminating direction that is parallel to the axial direction. Any pair of (40) formed by laminating a plurality of (40), exhibiting a recess (242) into which the one end of the tooth in the axial direction fits, and being laminated adjacent to each other in the first laminating direction. The magnetic resistance between the first magnetic plates is greater than the magnetic resistance between any pair of the second magnetic plates stacked adjacent to each other in the second stacking direction. It is a magnetic core for a child.

  The second aspect of the armature magnetic core according to the present invention is the first aspect, and any one of the pair of the first magnetic plates stacked adjacent to each other in the first stacking direction. The distance (dt) along the first stacking direction between each other is also the first between the pair of second magnetic plates stacked adjacent to each other in the second stacking direction. It is larger than the distance (db) along the stacking direction of 2.

  A third aspect of the armature core according to the present invention is the first or second aspect, wherein the teeth (22, 22a, 22b, 22c) are along the axial direction (Q). A winding part (222) and an embedding part (224) are provided, and the length of the embedding part in the first width direction (Wt) in the tooth is the first radial direction (Rt). It is substantially constant regardless of the position, and the length of the concave portion (242) in the first width direction is substantially equal to the length of the embedded portion.

  A fourth aspect of the armature magnetic core according to the present invention is the first or second aspect, and the first magnetic plate is formed by the first magnetic plate. The length in the first width direction (Wt) of the teeth (22, 2a, 22b, 22c) exhibits a first length (W1) and is laminated to form a winding part (222) of the teeth. And the first part has a second length (W2) in which the length in the first width direction is longer than the first length on the one side in the axial direction (Q) of the first part. And a second part that is laminated to form an embedding part (224) of the tooth, and the embedding part fits into the recess (242).

  A fifth aspect of the armature core according to the present invention is any one of the first to third aspects, wherein one of the teeth (22a, 22b, 22c) is the first of the teeth. A plurality of teeth pieces (228a-228g) adjacent in the width direction (Wt).

  A sixth aspect of the armature core according to the present invention is any one of the first to fifth aspects, and the first magnetic plate (30) has a first thickness (m1). And a second nonmagnetic film having a second thickness (m2) smaller than the first thickness is provided on the second magnetic plate (40). It is done.

  A seventh aspect of the armature core according to the present invention is any one of the first to sixth aspects, and the first magnetic plate (30) has one main surface (32s). ) At the first depth (d1) and the first convex portion (34t) protruding at the first height (h1) on the other main surface (32t). The first convex portion of one of the first magnetic plates, and the other first laminated on the one first magnetic plate in the first lamination direction. The first concave portion of the magnetic plate is engaged with the second magnetic plate (40), and the second magnetic plate (40) is recessed at the second depth (d2) on one main surface (42s) thereof. The second magnetic plate having the concave portion (44s) and the second convex portion (44t) protruding at the second height (h2) on the other main surface (42t). The second convex portion and the second concave portion of another second magnetic plate laminated adjacent to the one second magnetic plate in the second stacking direction are related. The thickness (t1) of the first magnetic material plate in the first lamination direction and the thickness (t2) of the second magnetic material plate in the second lamination direction are approximately the same, The ratio of the first height to the first depth (h1 / d1) is greater than the ratio of the second height to the second depth (h2 / d2). Greater than 1.

  An eighth aspect of the armature core according to the present invention is any one of the first to seventh aspects, and the back yoke (24) is a plan view from the axial direction (Q). A plurality of the second magnetic plates (40) having substantially the same shape are stacked in the second stacking direction, and the concave portion (242) is defined by the plurality of the second magnetic plates. The

  A ninth aspect of the armature core according to the present invention is any one of the first to eighth aspects, and the back yoke (24a) has the axial direction (Q) as a normal line. A plurality of divided bodies (24p) arranged in an annular shape centering on the rotation axis (A) on the surface and having substantially the same shape.

  A first aspect of a method for manufacturing an armature core according to the present invention is the manufacturing method according to any one of the first to ninth aspects of the armature core according to the present invention. A first step of forming one of the teeth (22, 22a, 22b, 22c) while punching a plurality of the first magnetic plates (30) with a mold, and a plurality of the second with a second mold. A second step of forming the back yoke (24, 24a) while punching the magnetic plate (40), and the pressure when punching the first magnetic plate is the second magnetic body. It is a manufacturing method of the armature magnetic core which is lower than the pressure when punching a plate.

  A second aspect of the armature core manufacturing method according to the present invention is the manufacturing method according to any one of the first to ninth aspects of the armature core according to the present invention, wherein the first gold A first step of forming one of the teeth (22, 22a, 22b, 22c) while punching a plurality of the first magnetic plates (30) with a mold, and a plurality of the second with a second mold. A second step of laminating a plurality of the second magnetic plates while punching out the magnetic plate (40), and forming the laminated body, and after the second step, the laminated body in the axial direction (Q) And a third step of applying a strong pressure.

  A first aspect of the rotating electrical machine according to the present invention includes the field element (10) and any one of the first to ninth aspects of the armature core (20) according to the present invention. The magnetic element has a plurality of field generating portions (12) arranged in an annular shape around the rotation axis (A) with different polarities toward the armature core, and the axial direction (Q ) In the second width direction (Wm) which is a direction perpendicular to the second radial direction (Rm) around the rotation axis (A) in the field generating portion of the field generating portion. The ratio (12w1 / 22w1, 12w2 / 22w2) of the length (12w1, 12w2) of the tooth (22) and the length (22w1, 22w2) in the first width direction (Wt) of the tooth (22) is It is a rotary electric machine (100) which changes according to the distance from the said rotating shaft.

  In a rotating electrical machine in which a tooth whose width direction is larger as the distance from the rotating shaft is farther away from a field generator having a larger length in the width direction as the distance from the rotating shaft is farther away, There is more magnetic flux on the outside in the radial direction. Therefore, when the first magnetic plate is laminated in the radial direction to form the teeth, the magnetic flux is transferred from the first magnetic plate on the outer side in the radial direction to the first magnetic plate adjacent on the inner side. Flows (magnetic flux flows across the boundary between the adjacent first magnetic plates), and an eddy current is generated. According to the first aspect of the armature core according to the present invention, the magnetic flux flowing through one first magnetic plate flows to the plurality of second magnetic plates, and the one first magnetism The magnetic flux that tends to flow from the body plate to another first magnetic body plate adjacent thereto is obstructed, which contributes to a reduction in eddy current loss.

  According to the second aspect of the armature core according to the present invention, the greater the distance along the first or second stacking direction, the greater the magnetic resistance, and therefore the first magnetism constituting one tooth. The magnetic flux which tends to flow in the 1st lamination direction between body plates can be inhibited.

  According to the third aspect of the armature core according to the present invention, the edge of the embedded portion exhibits a straight line in a plan view from the axial direction (does not exhibit a stepped shape). In the case where the edge of the concave portion provided by the back yoke exhibits a straight line in a plan view from the axial direction, it is possible to avoid or suppress the occurrence of a gap between the embedded portion and the back yoke. Thus, the magnetic resistance can be reduced, which contributes to the reduction of eddy current loss.

  According to the 4th aspect of the armature core which concerns on this invention, the magnetic flux which tends to flow to a 1st lamination direction in the bending | flexion site | part which a 1st part and a 2nd part form can be inhibited.

  According to the fifth aspect of the armature core according to the present invention, it contributes to the reduction of eddy current caused by the magnetic flux flowing not only in the first radial direction but also in the first width direction in one tooth.

  According to the sixth aspect of the armature core according to the present invention, it contributes to the realization of the second aspect of the armature core according to the present invention.

  According to the seventh aspect of the armature core according to the present invention, the first height is greater than the first depth, and the second height is greater than the second depth. The convex portion and the first concave portion, and the second convex portion and the second concave portion can each realize so-called Karamase. Moreover, since the ratio of the first height to the first depth is larger than the ratio of the second height to the second depth, the second aspect of the armature core according to the present invention is realized. Contribute to

  For example, as the distance from the rotating shaft increases, the magnetic flux that tends to flow in the first stacking direction inside the teeth can be suppressed by increasing the axial thickness of the back yoke. Since the first to seventh aspects of the magnetic core for the magnetic core inhibit the magnetic flux from flowing from one first magnetic plate to another first magnetic plate adjacent to the first magnetic plate in the first stacking direction, There is no need to change the axial thickness of the back yoke. According to the eighth aspect of the armature core according to the present invention, the mechanical strength of the back yoke can be maintained, and the manufacturing cost can be suppressed.

  According to the ninth aspect of the armature core according to the present invention, rather than forming the magnetic plate in the shape of the back yoke, it is better to form the back yoke in combination after forming the divided body shape, The size of the magnetic plate used for punching can be reduced, and the size of the remaining magnetic plate after being punched into a desired shape can be reduced. As a result, it contributes to the improvement of production efficiency.

  In the case of forming a laminated body while punching with a mold, the gap between members constituting the laminated body can be narrowed as the punching pressure is higher. According to the 1st aspect of the manufacturing method of the armature magnetic core which concerns on this invention, it contributes to obtaining the 2nd aspect of the armature magnetic core which concerns on this invention.

  According to the 2nd aspect of the manufacturing method of the armature magnetic core which concerns on this invention, it contributes to obtaining the 2nd aspect of the armature magnetic core which concerns on this invention.

  According to the 1st aspect of the rotary electric machine which concerns on this invention, the eddy current loss in a tooth can be reduced and, thereby, the operating efficiency of a rotary electric machine can be improved.

It is a disassembled perspective view of the rotary electric machine carrying the armature magnetic core which concerns on Example 1 of this invention. It is a plane perspective view from the axial direction of a field generating part and teeth. It is a fragmentary sectional view of the armature magnetic core. It is a disassembled perspective view of the teeth which the magnetic core for armatures concerning Example 2 employ | adopts. It is a top view from the axial direction of the teeth which the magnetic core for armatures concerning Example 3 employs. It is a top view from the axial direction of the teeth which the armature magnetic core concerning Example 4 adopts. It is a top view from the axial direction of the back yoke which the magnetic core for armatures concerning Example 5 employ | adopts.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following drawings including FIG. 1, only elements related to the present invention are shown.

<Example 1>
As shown in FIG. 1, the armature core 20 according to the first embodiment of the present invention is mounted on an axial gap type rotating electrical machine 100. In the rotating electrical machine 100, the field element 10 as a rotor and the armature 80 as a stator face each other along an axial direction Q parallel to the rotation axis A. The field element 10 includes a field generation unit 12 and a yoke 11 that holds the field generation unit 12. The armature 80 has an armature core 20 and a plurality of armature windings 50. The armature core 20 includes a plurality of teeth 22 arranged in a ring around the rotation axis A and the teeth 22 on one side in the axial direction Q (in this embodiment, the field element 10 and the armature 80 Has a back yoke 24 and a reinforcing plate 21 that are held at the ends (the opposite side is “one side in the axial direction Q”). The field generator 12 is, for example, a permanent magnet.

  In order to help understanding the structure, the axial gap type rotating electrical machine 100 is shown exploded along the rotation axis A. However, in the assembled state, the field element 10, the armature 80, Are opposed to each other through a predetermined gap. Further, the field generating portion 12 and the yoke 11 are in contact with each other, and the teeth 22, the back yoke 24, and the reinforcing plate 21 are also in contact with each other. An armature winding 50 is wound around each of the teeth 22. In FIG. 1, the armature winding 50 is shown only next to one tooth 22, but actually the armature winding 50 is wound around all the teeth 22.

  In the present application, unless otherwise specified, the armature winding 50 does not indicate one of the conductive wires constituting the armature winding 50 but indicates a mode in which the conductive wires are wound together. The same applies to the drawings. In addition, the drawing lines at the beginning and end of winding and their connections are also omitted in the drawings. Further, the winding method of the armature winding 50 is arbitrary, such as a spindle winding for rotating the workpiece and winding, a nozzle winding for rotating the nozzle around the fixed workpiece, and the like. Furthermore, it is preferable to use a self-bonding wire that heats the conductive wires while winding or after winding. Moreover, you may mold with resin after winding.

  As shown in FIG. 2, each of the field generation units 12 is a direction perpendicular to the second radial direction Rm around the rotation axis A in the one field generation unit 12 in a plan view from the axial direction Q. The length of the second width direction Wm is generally larger as the distance from the rotation axis A is longer. Specifically, the length 12w1 in the second width direction Wm at the distance R1 from the rotation axis A and the length 12w2 in the second width direction Wm at the distance R2 where the distance from the rotation axis A is larger than the distance R1. And the relationship of 12w1> 12w2 is satisfied over substantially the entire second radial direction Rm. However, both ends in the second radial direction Rm, particularly the end portion on the side far from the rotation axis A, do not necessarily satisfy the relationship. Here, each of the field generators 12 has a substantially arc shape in a plan view from the axial direction Q, and the focal point of the arc is located on the rotation axis A side with respect to the field generator 12, It is arranged in an annular shape around the rotation axis A.

  Each of the teeth 22 includes a first stacked body in which a plurality of first magnetic plates 30 are stacked in a first stacking direction substantially parallel to the first radial direction Rt of the teeth 22. As a specific example, the tooth 22 has a first laminated body in which a plurality of first magnetic plates 30 are laminated, and the first laminated body is substantially line symmetric in plan view from the axial direction Q. The rotation axis A is located on the axis of symmetry. Such teeth 22 can be obtained, for example, by sequentially laminating the shape of the first magnetic plate 30 punched from the magnetic plate while gradually changing the shape. As a method of fixing the laminated first magnetic plates 30 to each other, for example, fixing by Karamase can be mentioned, which will be described in detail later.

  Each of the teeth 22 includes a winding portion 222 in which the length in the first width direction Wt of the tooth 22 exhibits the first length W1, and a first width on one side in the axial direction Q of the winding portion 222. The embedded portion 224 has a length in the direction Wt and a second length W2. The second length W2 exhibited by the embedded portion 224 is substantially constant regardless of the position in the first radial direction Rt. The first length W1 can take different values depending on the position in the first radial direction Rt, but FIG. 1 shows an example.

  The winding part 222 has a substantially isosceles trapezoidal shape in plan view from the axial direction Q. In other words, the length in the first width direction Wt of the first magnetic plate 30 forming the winding part 222 is the length of the first magnetic plate 30 adjacent to the outside in the first stacking direction. It is shorter than the length in the first width direction Wt. Since the armature winding 50 is wound around the winding portion 222, the portion around which the armature winding 50 is wound is formed wider toward the outside in the first radial direction Rt. Therefore, the armature winding 50 can be provided in a wide area in plan view from the axial direction Q.

  The embedded portion 224 has a substantially rectangular shape in plan view from the axial direction Q. In other words, the first magnetic plate 30 forming the embedded portion 224 has a substantially constant length in the first width direction Wt over the entire first stacking direction in plan view from the axial direction Q. That is, the first magnetic plate 30 forming the embedded portion 224 does not exhibit a step at the end portion in the first width direction Wt in a plan view from the axial direction Q. Further, the back yoke 24 is formed of a magnetic material and is disposed on one side in the axial direction Q with respect to the teeth 22. Specifically, the back yoke 24 exhibits a recess 242 in which the embedded portion 224 of the tooth 22 is fitted. That is, the length of the concave portion 242 in the first width direction Wt substantially matches the second length W2 of the embedded portion 224 in the first width direction Wt. Therefore, it is possible to avoid or suppress the generation of a gap between the embedded portion 224 and the back yoke 24. Thus, the magnetoresistance between the two can be reduced.

  Here, the second length W2 of the embedded portion 224 is the same as or longer than the first length W1 of the winding portion 222 in the first width direction Wt. In short, the embedded portion 224 is formed to have the same width as the winding portion 222 or wider than the winding portion 222. Therefore, it is possible to avoid an increase in the magnetic resistance at the portion that flows from the winding portion 222 to the embedded portion 224. Referring to FIG. 1, an embedded portion 224 is embedded in a concave portion 242 exhibited by the back yoke 24, and both are magnetically coupled. Here, if the embedded portion 224 is equal in width to the winding portion 222 or wider than the winding portion 222, the back yoke 24 starts from the end on one side in the axial direction Q of the first magnetic plate 30. It is possible to avoid or suppress the magnetic flux from entering perpendicularly to the surface on which the film extends. This contributes to avoiding an increase in magnetic resistance between the teeth 22 and the back yoke 24.

  The back yoke 24 includes a plurality of substantially annular second magnetic plates 40 stacked in a second stacking direction parallel to the axial direction Q. More specifically, a substantially annular second magnetic body having a substantially circular outer shape and a void corresponding to a shape in plan view from the axial direction Q of the embedded portion 224 arranged in an annular shape inside. The back yoke 24 is formed by laminating a plurality of the plates 40 along the axial direction Q. Each of the plurality of second magnetic plates 40 has substantially the same shape. The gaps provided by each of the plurality of second magnetic plates 40 cooperate to define the recess 242.

  Since the back yoke 24 is formed by laminating the plurality of second magnetic plates 40, the magnetic flux flows in the back yoke 24 in a direction perpendicular to the second lamination direction of the second magnetic plates 40. . Therefore, eddy current loss in the back yoke 24 can be reduced.

  A substantially annular reinforcing plate 21 is provided on one side in the axial direction Q of the back yoke 24. The embedding portion 224 of the tooth 22 may have a protruding portion 221 that protrudes to the opposite side of the winding portion 222, and may have a hole 211 in which the reinforcing plate 21 is fitted with the protruding portion 221. By fitting the protruding portion 221 with the hole 211, the reinforcing plate 21 increases the strength for mechanically holding the teeth 22.

  On the other hand, the teeth 22 and the back yoke 24 are magnetically coupled, and the back yoke 24 does not necessarily have to hold the teeth 22 mechanically. The back yoke 24 assists the flow of magnetic flux flowing between the teeth 22. On the other hand, the mechanical strength of the armature 80 is increased by having the reinforcing plate 21. Therefore, the back yoke 24 and the reinforcing plate 21 can be formed with materials in view of the functions to be secured by the magnetic coupling and the mechanical coupling as long as they are fixed to each other. Specifically, as described above, the back yoke 24 is mainly formed by the second magnetic body plate 40 stacked along the axial direction Q, but may be formed by a dust core. Moreover, a metal lump can be mentioned as a material of the reinforcement board 21. FIG.

  The fixing between the teeth 22 and the reinforcing plate 21 is not necessarily the fitting between the protruding portion 221 and the hole 211, and both may be fixed by bonding. Thus, when providing the hole 211, the recessed part 242 penetrates in the axial direction Q. However, there may be a case where the reinforcing plate 21 is not provided. In this case, the concave portion 242 does not need to penetrate in the axial direction Q, and in the axial direction Q, there is a concave portion for simply fitting with the embedded portion 224. If there is enough. Further, when the reinforcing plate 21 is not provided, the hole 211 is naturally not provided, and thus the tooth 22 does not need to exhibit the protruding portion 221. However, in this case, it is desirable that the teeth 22 and the back yoke 24 are magnetically and mechanically coupled.

  As described above, each of the teeth 22 is formed by stacking a plurality of first magnetic plates 3, and the back yoke 24 is formed by stacking a plurality of second magnetic plates 40. Here, the magnetic resistance between the pair of first magnetic plates 30 adjacent to each other in the first stacking direction of the first magnetic plates 30 is the second stack of the second magnetic plates 40. It is larger than the magnetic resistance between any pair of second magnetic plates 40 adjacent in the direction.

  Teeth 22 and field generator 12 have the following relationship. Specifically, as shown in FIG. 2, in a plan view from the axial direction Q, a second direction that is perpendicular to the second radial direction Rm around the rotation axis A in one field generation unit 12 is used. The ratio of the length in the width direction Wm to the length in the first width direction Wt that is perpendicular to the first radial direction Rt around the rotation axis A in one tooth 22 is the distance from the rotation axis A. Depending on.

  More specifically, at a position separated from the rotation axis A by a distance R1 (where R1> 0) in plan view from the axial direction Q, the tooth 22 exhibits a length 22w1 in the first width direction Wt, and the field It is assumed that the magnetism generator 12 exhibits a length 12w1 in the second width direction Wm. Further, at a position separated from the rotation axis A by a distance R2 (where R2> R1) in plan view from the axial direction Q, the teeth 22 have a length 22w2 in the first width direction Wt, and the field generator 12 Suppose that length 12w2 is exhibited in the second width direction Wm. At this time, the ratio 12w1 / 22w1 of the length 12w1 and the length 22w1 and the ratio 12w2 / 22w2 of the length 12w2 and the length 22w2 take different values. If there is such a difference in the ratio, the magnetic flux density of the magnetic flux flowing through the teeth 22 will differ depending on the position in the first radial direction Rt, and the magnetic flux flowing through the teeth 22 will easily flow in the first radial direction Rt. . If the armature core 20 as described above is employed, the magnetic flux can be inhibited. In the present invention, the magnetic flux that tends to flow in the first radial direction Rt in the teeth 22 is inhibited, and the magnetic flux flows in the first radial direction Rt in the back yoke 24. Thereby, the magnetic flux is made uniform in the back yoke 24.

  In FIG. 2, the field generator 12, the second radial direction Rm, and the second width direction Wm are indicated by solid lines, and the teeth 22, the first radial direction Rt, and the first width direction Wt are indicated by broken lines. ing. Further, in order to clarify that the distances R1, R2 in the second radial direction Rm and the distances R1, R2 in the first radial direction Rt are equal to each other, a circle centered on the rotation axis A is indicated by a one-dot chain line. Yes. Moreover, although the field generator 12 is illustrated as having eight (that is, four pole pairs) and nine teeth 22 (that is, nine slots), the present invention is not limited to this.

  FIG. 3 is a partial cross-sectional view of the armature core 20 and shows a cross section of the region corresponding to the region C indicated by the alternate long and short dash line in FIG. 1 as viewed from the first width direction Wt. Specifically, as shown in FIG. 3, the first magnetic plate 30 has a first main surface 32 s on one side in the first stacking direction, and on the other side opposite to the one side. The second main surface 32t is presented. In this embodiment, the direction away from the rotation axis A is “one side in the first stacking direction”, and the direction approaching the rotation axis A is “the other side in the first stacking direction”. The second magnetic plate 40 exhibits a third main surface 42s on one side in the second stacking direction, and a fourth main surface 42t on the other side opposite to the other side. In the present embodiment, similarly to the above-mentioned “one side in the axial direction Q”, the side opposite to the field element 10 with respect to the armature 80 is defined as “one side in the second stacking direction”. The field element 10 side with respect to 80 is defined as “the other side in the second stacking direction”.

  The first magnetoresistance Mt between the first main surface 32s and the second main surface 32t adjacent to the first main surface 32s in the first stacking direction is the same as the third main surface 42s and the second stack. It is larger than any second magnetic resistance Mb between the fourth main surfaces 42t adjacent in the direction.

  For example, the first magnetic resistance Mt has a different value Mt (R) depending on the position in the first radial direction Rt, and the second magnetic resistance Mb has a different value Mb (depending on the position in the axial direction Q. When Q) is taken, a relationship of Mtmin> Mbmax is established by comparing the minimum value Mtmin of the first magnetic resistance Mt and the maximum value Mbmax of the second magnetic resistance Mb. In the present embodiment, the value Mt (R) is different depending only on the position in the first radial direction Rt. However, the value Mt (R) may be different depending on the position in the axial direction Q, or Further, different values may be taken depending on the position in the first width direction Wt. Similarly, the value Mb (Q) may take a different value depending on the position in the first radial direction Rt, or may take a different value depending on the position in the first width direction Wt.

  The first magnetic resistance Mt takes a constant value Mtc without depending on the position in the first radial direction Rt, and the second magnetic resistance Mb has a different value Mb (Q) depending on the position in the axial direction Q. When M is taken, the relationship of Mtc> Mbmax is established. Further, the first magnetic resistance Mt takes a different value Mt (R) depending on the position in the first radial direction Rt, and the second magnetic resistance Mb does not depend on the position in the axial direction Q and has a constant value Mbc. When M is taken, a relationship of Mtmin> Mbc is established. The first magnetic resistance Mt takes a constant value Mtc without depending on the position in the first radial direction Rt, and the second magnetic resistance Mb takes a constant value Mbc without depending on the position in the axial direction Q. Sometimes the relationship Mtc> Mbc holds.

  A tooth 22 having a greater length in the first width direction Wt as the distance from the rotation axis A is longer, and a field generator 12 having a greater length in the second width direction Wm as the distance from the rotation axis A is longer. In the rotating electrical machine 100 facing each other, there is more magnetic flux toward the outside of the tooth 22 in the first radial direction Rt. Therefore, when the teeth 22 are formed by laminating the first magnetic plate 30 along the first radial direction Rt, the first magnetic plate 30 on the outer side of the first radial direction Rt is moved to the inside thereof. Magnetic flux flows to adjacent first magnetic plates 30 (magnetic flux flows across the boundary between adjacent first magnetic plates 30), and eddy current is generated. However, if the relationship of Mtmin> Mbmax is satisfied, a plurality of second magnets in which the magnetic flux flowing through the first magnetic plate 30 is magnetically coupled to the first magnetic plate 30. The magnetic path flowing from the first magnetic plate 30 to the other adjacent first magnetic plate 30 has a higher magnetic resistance than the magnetic path flowing to the body plate 40, and the magnetic flux Is difficult to flow. Therefore, it will hinder the crossing of the magnetic flux, which contributes to the reduction of eddy current loss.

  For example, if the thickness of the back yoke in the axial direction Q is increased as the distance from the rotation axis A is increased, the magnetic flux that flows in the first stacking direction inside the teeth 22 can be suppressed. That is, the crossing of the magnetic flux can be suppressed without satisfying the relationship of Mtmin> Mbmax. However, the present invention satisfies the relationship of Mtmin> Mbmax, and the magnetic flux flows from one first magnetic plate 30 to another first magnetic plate 30 adjacent thereto in the first stacking direction. Therefore, it is not necessary to change the thickness of the back yoke 24 in the axial direction Q. If it is not necessary to change the thickness of the back yoke 24 in the axial direction Q, the mechanical strength of the back yoke 24 can be maintained. Further, the manufacturing cost can be suppressed as compared with the case where the thickness of the back yoke 24 in the axial direction Q is changed.

  In order to obtain the relationship of Mtmin> Mbmax, the aspect of the armature core 20 is set as follows, for example.

  The first mode for obtaining the relationship of Mtmin> Mbmax is the distance dt along the first stacking direction between the first magnetic plates 30 adjacent in the first stacking direction in the second stacking direction. The distance is set larger than the distance db along the second stacking direction between the adjacent second magnetic plates 40. Specifically, the distance dt between any first main surface 32s and the second main surface 32t adjacent to the first main surface 32s in the first stacking direction is equal to the third main surface 42s and the second main surface 32t. The distance is larger than any distance db between the fourth main surfaces 42t adjacent in the stacking direction.

  The greater the distance along the first stacking direction or the second stacking direction, the greater the magnetic resistance, so that the magnetic flux flowing through one first magnetic plate 30 flows to the plurality of second magnetic plates 40, The magnetic flux which tends to flow in the 1st lamination direction between the 1st magnetic body plates 30 which comprise the one tooth | gear 22 can be inhibited.

  Each of the first magnetic plate 30 and the second magnetic plate 40 may be provided with a nonmagnetic film such as a resin. Therefore, the second mode for obtaining the relationship of Mtmin> Mbmax is to set the first thickness m1 along the first stacking direction of the nonmagnetic film F1 provided on the first magnetic plate 30 to the second level. The non-magnetic film F2 provided on the magnetic plate 40 is thicker than the second thickness m2 along the second stacking direction. By making the thicknesses m1 and m2 of the nonmagnetic films F1 and F2 different, the magnetic flux flowing through one first magnetic plate 30 flows to the plurality of second magnetic plates 40, and the first magnetic body The magnetic flux which is going to flow in the 1st lamination direction between plates 30 can be inhibited.

  As described above, fixation by Karamase can be given as a method for fixing the first magnetic plates 30 to each other. For example, in the case where the plate members are fixed to each other by karamase, each plate member is provided with a concave portion and a convex portion, and the concave portion and the convex portion are fitted to each other so that the plate members are mutually attached. Fix it. Then, the 3rd aspect for obtaining the relationship of Mtmin> Mbmax makes the protrusion condition of a convex part, and the recess condition of a recessed part different. In addition, when fixing a recessed part and a convex part with Karamase, the length of the said recessed part along the direction perpendicular | vertical to the direction where the said recessed part dents, and the said convex along the direction perpendicular | vertical to the direction where the said convex part protrudes The length of the part needs to be comparable.

  Specifically, one first magnetic plate 30 exhibits a first recess 34s that is recessed at a first depth d1 in the first stacking direction on the first main surface 32s thereof, and the first main plate 30s. On the second main surface 32t of the other first magnetic plate 30 adjacent to the surface 32s in the first stacking direction, a first protrusion 34t protruding at the first height h1 in the first stacking direction is provided. Present. Then, the first concave portion 34 s exhibited by the one first magnetic plate 30 and the first convex portion 34 t exhibited by the other first magnetic plate 30 are engaged. At this time, the ratio h1 / d1 of the first height h1 to the first depth d1 is greater than 1. In FIG. 3, the first magnetic plate 30 is provided with a nonmagnetic film F1, and the first recess 34s and the first protrusion 34t are engaged via the nonmagnetic film F1. .

  The second magnetic plate 40 has a second recess 44s that is recessed at the second depth d2 in the second stacking direction on the third main surface 42s, and the third main surface 42s has the second main surface 42s. On the fourth main surface 42t of the other second magnetic plate 40 adjacent in the second stacking direction, a second convex portion 44t that protrudes in the second stacking direction at the second height h2 is presented. And the 2nd recessed part 44s which the said 2nd magnetic body board 40 exhibits, and the 2nd convex part 44t which the said other 2nd magnetic body board 40 exhibits engage. At this time, the ratio h2 / d2 of the second height h2 to the second depth d2 is greater than 1. Here, when the thickness t1 in the first stacking direction of the first magnetic plate 30 and the thickness t2 in the second stacking direction of the second magnetic plate 40 are approximately the same, the ratio h2 / d2 is the ratio. It is desirable to be smaller than h1 / d1. In FIG. 3, the second magnetic plate 40 is provided with a nonmagnetic film F2, and the second recess 44s and the second protrusion 44t are engaged via the nonmagnetic film F2. .

  Since the ratio h1 / d1 of the first height h1 to the first depth d1 is greater than the ratio h2 / d2 (> 1) of the second depth d2 of the second height h2, the first The distance dt along the first stacking direction between the first magnetic plates 30 adjacent in the stacking direction is set along the second stacking direction between the second magnetic plates 40 adjacent in the second stacking direction. It is possible to make the distance greater than the distance db. Accordingly, the magnetic flux flowing through one first magnetic plate 30 flows to the plurality of second magnetic plates 40 and tends to flow in the first stacking direction between the first magnetic plates 30. Can be inhibited.

  FIG. 3 shows a diagram including a plurality of modes for obtaining the above-described relationship of Mtmin> Mbmax. However, only one of the modes may be used. For example, if the thicknesses of the nonmagnetic films F1 and F2 are different from each other, the first magnetic plates 30 and the second magnetic plates 40 do not need to be fixed to each other by karamase. May be.

  The relationship of Mtmin> Mbmax can also be obtained by manufacturing the armature core 20 by the following manufacturing method. For example, the teeth 22 are formed by sequentially punching a plurality of magnetic plates with a first pressure using a mold (not shown) to form the plurality of first magnetic plates 30. 30 are stacked in the first stacking direction. Further, the back yoke 24 forms a plurality of second magnetic plates 40 by sequentially punching a plurality of magnetic plates with a second pressure using a mold (not shown) to form a plurality of second magnetic plates 40. The plate 40 is formed by laminating in the second laminating direction. At this time, the first pressure is lower than the second pressure. If the first magnetic plate 30 and the second magnetic plate 40 are made of the same material, the thicknesses t1 and t2 are about the same, so that the laminated body (the teeth 22 or the back yoke 24) is punched out with a mold. When the punching pressure is higher, the gap between the members (the first magnetic plate 30 or the second magnetic plate 40) constituting the laminated body can be narrowed. Therefore, if the first pressure is lower than the second pressure, the distance dt along the first stacking direction between the first magnetic plates 30 is set to the second stack between the second magnetic plates 40. It can be larger than the distance db along the direction.

  Although the direction in which the first magnetic plate 30 is punched is arbitrary, FIG. 3 illustrates an embodiment in which the first magnetic plate 30 is punched from the outside in the first radial direction Rt to the inside (side toward the rotation axis A). . The direction in which the second magnetic plate 40 is punched is arbitrary, but when the reinforcing plate 21 is provided as in the present embodiment, the direction away from the reinforcing plate 21 (the other of the axial directions Q in FIG. 3). It is desirable to punch toward the side. This is because the second convex portion 44t may interfere with the reinforcing plate 21 and hinder the adhesion between the back yoke 24 and the reinforcing plate 21.

  In FIG. 3, among the plurality of first magnetic plates 30, the first magnetic plate 30 located closest to the rotation axis A is replaced with the first concave portion 34s and the first convex portion 34t. A first through hole 34u is provided. The first convex portions 34t exhibited by the first magnetic plates 30 adjacent in the first stacking direction of the first magnetic plates 30 are engaged with the first through holes 34u. In addition, among the plurality of second magnetic plates 40, the second magnetic plate 40 located on the other side in the most axial direction Q is replaced with the second concave portion 44s and the second convex portion 44t. Through-holes 44u are provided. The 2nd convex part 44t which the 2nd magnetic body board 40 adjacent in the 2nd lamination direction of the said 2nd magnetic body board 40 exhibits engages with the 2nd through-hole 44u.

  When the first magnetic plates 30 adjacent in the first stacking direction are fixed by the engagement of the first concave portions 34s and the first convex portions 34t, the first magnetic plates 30 are respectively attached to the first magnetic plate 30. Since the nonmagnetic film F1 is provided, two nonmagnetic films F1 are interposed between the first concave portion 34s and the first convex portion 34t. On the other hand, when the first magnetic plates 30 adjacent in the first stacking direction are fixed by the engagement of the first protrusion 34t and the first through hole 34u, the first penetration Since the nonmagnetic film F1 is removed in the hole 34u, one nonmagnetic film F1 is interposed between the first protrusion 34t and the first through hole 34u. Since the first through hole 34u is formed by punching the first magnetic plate 30 provided with the nonmagnetic film F1 in advance, the nonmagnetic film F1 is removed inside the first through hole 34u. It is.

  Therefore, the first magnetic plate 30 provided with the first concave portion 34s and the first magnetic plate 30 provided with the first convex portion 34t engaged with the first concave portion 34s. A first shortest distance dm, a first magnetic plate 30 provided with a first through hole 34u, and a first convex portion 34t that engages with the first through hole 34u. Comparing the second shortest distance dn with the first magnetic plate 30, the second shortest distance dn is shorter than the first shortest distance dm.

  That is, the first protrusion 34t and the first penetration are smaller than the minimum value MR1 of the magnetic resistance between the first magnetic plates 30 engaged by the first recess 34s and the first protrusion 34t. The minimum value MR2 of the magnetic resistance between the first magnetic plates 30 engaged with the hole 34u is smaller. Therefore, if the relationship of MR2> Mbmax is satisfied instead of the relationship of Mtmin> Mbmax, the first magnetic plates 30 engaged with each other between the first concave portion 34s and the first convex portion 34t are connected to each other. In addition to being able to inhibit not only the magnetic flux that flows to the first magnetic plate 30 but also the magnetic flux that flows from the first magnetic plate 30 exhibiting the first through-hole 34u to the first magnetic plate 30 adjacent to the first magnetic plate 30. desirable.

  The relationship of Mtmin> Mbmax can also be obtained by manufacturing the armature core 20 by the following manufacturing method. For example, the teeth 22 are formed while punching the plurality of first magnetic plates 30 from the magnetic plate. Further, the plurality of second magnetic plates 40 are laminated while being punched from the magnetic plate at a pressure comparable to the punching pressure when forming the teeth 22. Then, the back yoke 24 is formed by strongly pressing a plurality of the stacked second magnetic plates 40 in the second stacking direction. If manufactured in this way, the first magnetic plates 30 may be arranged in the same manner as in the case where the teeth 22 and the back yoke 24 are formed by making the first pressure and the second pressure different from each other. The distance dt along the stacking direction can be made larger than the distance db along the second stacking direction between the second magnetic plates 40.

  Alternatively, the armature core 20 satisfying the relationship of Mtmin> Mbmax can also be obtained by making the punching pressure of the first magnetic plate 30 smaller than the punching pressure of the second magnetic plate 40. In this case, it is not always necessary to strongly press a plurality of second magnetic plates 40 in the second stacking direction. Alternatively, the back yoke 24 is formed by strongly pressing a plurality of second magnetic plates 40 in the second stacking direction, and the teeth 22 of the first magnetic plates 30 are at a pressure lower than the pressure at the time of the strong press. The armature core 20 that satisfies the relationship of Mtmin> Mbmax can also be obtained by punching a plurality.

<Example 2>
In the first embodiment, the aspect in which the teeth 22 are formed by a single member (one first magnetic plate 30) in the first width direction Wt has been described, but the present invention is not limited to this.

  For example, as shown in FIG. 4, one tooth 22a may include a plurality of teeth pieces 228a and 228b adjacent to each other in the first width direction Wt of the tooth 22a. Specifically, the teeth pieces 228a and 228b are formed by laminating a plurality of first magnetic plates 30 formed in a predetermined shape, and are line-symmetric with each other in plan view from the axial direction Q. It exhibits a line-symmetric shape in plan view from the first radial direction Rt. Even in such a tooth 22a, if the relationship of Mtmin> Mbmax as shown in FIG. 3 is satisfied, the magnetic flux flowing through the first first magnetic plate 30 is the first first magnetic plate. Flows to a plurality of second magnetic plates 40 that are magnetically coupled to the first magnetic plate 30, and flows from the first first magnetic plate 30 to another adjacent first magnetic plate 30. Since the magnetic flux to be hindered is obstructed, it contributes to the reduction of eddy current loss. Note that the minimum value Mtmin of the first magnetic resistance Mt is the smaller value of the minimum values of both the tooth pieces 228a and 228b in the second embodiment.

  Further, since the teeth pieces 228a and 228b are connected to each other while maintaining a line-symmetric positional relationship to form one tooth 22a, the eddy current caused by the magnetic flux flowing in the first radial direction Rt of the teeth 22a is reduced. It also helps to do. When the teeth pieces 228a and 228b are connected to each other, a non-magnetic film or the like (not shown) is sandwiched between the pieces and the magnetic short circuit at the connected parts is cut off to reduce eddy current loss. You may do it.

<Example 3>
In the said Example 1, 2, the 1st radial direction Rt in the position of the half of the length of the 1st width direction Wt of the teeth 22 and 22a, and the 1st magnetic board 30 which the said teeth 22 and 22a have are said. Although the aspect in which the first stacking direction is substantially parallel has been described, the present invention is not limited to this.

  For example, as shown in FIG. 5, one tooth 22b may include two teeth pieces 228c and 228d. The teeth pieces 228c and 228d are formed by laminating a plurality of first magnetic plates 30 formed in a predetermined shape, and have shapes symmetrical to each other like the teeth pieces 228a and 228b in the second embodiment. The teeth 22b are formed by connecting and maintaining a line-symmetric positional relationship. However, the teeth pieces 228c and 228d are different from the teeth pieces 228a and 228b in the stacking direction, and both the stacking directions are not parallel to the first radial direction Rt in the teeth 22b.

  Even in such a tooth 22b, if the relationship of Mtmin> Mbmax as shown in FIG. 3 is satisfied, the magnetic flux flowing through one first magnetic plate 30 is the one first magnetic plate. Flows to a plurality of second magnetic plates 40 that are magnetically coupled to the first magnetic plate 30, and flows from the first first magnetic plate 30 to another adjacent first magnetic plate 30. Since the magnetic flux to be hindered is obstructed, it contributes to the reduction of eddy current loss. Note that the minimum value Mtmin of the first magnetic resistance Mt is the smaller value of the minimum values of both the tooth pieces 228c and 228d in the third embodiment.

<Example 4>
In the said Example 2, 3, although the two teeth piece 228a, 228b; 228c, 228d was connected and the aspect which forms one teeth 22a, 22b was demonstrated, this invention is not limited to this.

  For example, as shown in FIG. 6, one tooth 22c may include three tooth pieces 228c, 228d, and 228e. Specifically, for example, a plurality of first magnetic plates 30 are formed between the tooth piece 228c and the tooth piece 228d forming the tooth 22b shown in the third embodiment, and are formed from the axial direction Q. The teeth 22c may be formed by providing the teeth pieces 228e having a substantially rectangular shape in plan view.

  Even in such a tooth 22c, as long as the relationship of Mtmin> Mbmax as shown in FIG. 3 is satisfied, the magnetic flux flowing through the first magnetic plate 30 is the first magnetic plate. Flows to a plurality of second magnetic plates 40 that are magnetically coupled to the first magnetic plate 30, and flows from the first first magnetic plate 30 to another adjacent first magnetic plate 30. Since the magnetic flux to be hindered is obstructed, it contributes to the reduction of eddy current loss. Note that the minimum value Mtmin of the first magnetic resistance Mt is a smaller value among the minimum values of the tooth pieces 228c, 228d, and 228e in the fourth embodiment. With such a tooth 22c, the magnetic flux flowing in the first width direction Wt can be further inhibited, which contributes to a reduction in eddy current loss.

<Example 5>
In the first embodiment, the aspect in which the back yoke 24 is formed by laminating a plurality of second magnetic plates 40 having substantially the same shape in plan view from the axial direction Q in the second laminating direction has been described. However, the present invention is not limited to this.

  For example, as shown in FIG. 7, the back yoke 24 a has a plurality of divided bodies 24 p that are arranged in an annular shape around the rotation axis A on the surface having the axial direction Q as a normal line and have substantially the same shape. . Each of the divided bodies 24p is formed by stacking a plurality of second magnetic plates 40 in the axial direction Q. Each of the divided bodies 24p protrudes from the center in the circumferential direction of the arc presented by the first portion 25a toward the focal point of the arc, in a plan view from the axial direction Q. This can be grasped separately from the second part 25b. A plurality of first portions 25a are connected to form an outer shape of the back yoke 24a, and a second portion 25b forms a region between the recesses 242 adjacent to each other in the circumferential direction θ about the rotation axis A.

  That is, here, the number of recesses 242 (9 in FIG. 7) exhibited by the back yoke 24a and the number of divided bodies 24p forming the back yoke 24a are exemplified. One end of the first portion 25a in the circumferential direction θ protrudes in the circumferential direction θ and exhibits a protrusion 25c extending in the axial direction Q, and the other end has a recess 25d that is recessed in the circumferential direction θ and extends in the axial direction Q. . The protrusion 25c exhibited by one divided body 24p and the recessed line 25d exhibited by another divided body 24p adjacent thereto are fitted. In other words, the one divided body 24p and the other divided body 24p adjacent thereto are coupled to each other on the opposite side of the rotation axis A with respect to the recess 242.

  Thus, rather than forming the second magnetic plate 40 in the shape of the back yoke 24, the back yoke 24a is formed after combining the divided body 24p into the shape of the divided body 24p. The size can be reduced, and the size of the remaining magnetic plate after being punched into a desired shape can be reduced. As a result, it contributes to the improvement of production efficiency.

A Rotating shaft Q Axial direction Rt First radial direction Rm Second radial direction Wt First width direction Wm Second width direction W1, W2 First and second lengths dt, db Distance m1, m2 Thickness 10 Field element 12 Field generating portion 22, 22a, 22b, 22c Teeth 222 Winding portion 224 Embedding portion 228a-228e Teeth piece 242 Recessed portion 24p Divided body 30 First magnetic plate 32s First main surface 32t Second Main surface 34s First convex portion 34t First concave portion 40 Second magnetic plate 42s Third main surface 42t Fourth main surface 44s Second concave portion 44t Second convex portion 12w1, 12w2 Length 22w1, 22w2 Length 12w1 / 22w1, 12w2 / 22w2 ratio 100

Claims (12)

In the armature as a stator facing the field element (10) as the rotor along the rotation axis (A) of the rotating electric machine (100),
A plurality of teeth (22, 22a, 22b, 22c) annularly arranged around the rotation axis on one side in the axial direction (Q) parallel to the rotation axis with respect to the field element;
An armature core (20) comprising a back yoke (24, 24a) for magnetically coupling the teeth to each other on the one side in the axial direction;
As the distance from the rotating shaft increases, the tooth has a first width direction (Rt) that is perpendicular to both the first radial direction (Rt) and the axial direction of the tooth. Wt) is long,
The teeth are formed by laminating a plurality of first magnetic plates (30) in a first laminating direction substantially parallel to the first radial direction,
The back yoke is formed by laminating a plurality of second magnetic plates (40) in a second laminating direction parallel to the axial direction, and the one end of the teeth in the axial direction is fitted into the back yoke. Presenting a recess (242),
The magnetoresistance between any pair of the first magnetic plates stacked adjacent to each other in the first stacking direction is equal to any pair of the layers stacked adjacent to each other in the second stacking direction. Greater than the magnetoresistance between the second magnetic plates,
Armature core. The distance (dt) along the first stacking direction between the pair of first magnetic plates stacked adjacent to each other in the first stacking direction is also the second stacking direction. Greater than the distance (db) along the second stacking direction between any pair of the second magnetic plates stacked adjacent to each other,
The armature core (20) according to claim 1. The teeth (22, 22a, 22b, 22c) have a winding part (222) and an embedding part (224) along the axial direction (Q),
The length of the embedded portion in the first width direction (Wt) of the teeth is substantially constant regardless of the position in the first radial direction (Rt),
A length of the concave portion (242) in the first width direction substantially matches a length of the embedded portion;
The armature core (20) according to claim 1 or 2. The first magnetic plate (30) is
The length of the first width direction (Wt) in the teeth (22, 2a, 22b, 22c) formed by the first magnetic plate exhibits the first length (W1), and is laminated and the A first part forming a winding part (222) of teeth;
The first portion has a second length (W2) in which the length in the first width direction is longer than the first length on the one side in the axial direction (Q), and the teeth are stacked and laminated. A second part forming a buried part (224) of
The embedded portion fits into the recess (242);
The armature core (20) according to claim 1 or 2. One said tooth (22a, 22b, 22c) has a plurality of teeth pieces (228a-228g) adjacent to each other in the first width direction (Wt) of the tooth.
The armature core (20) according to any one of claims 1 to 3. The first magnetic plate (30) is provided with a first nonmagnetic film having a first thickness (m1),
The second magnetic plate (40) is provided with a second non-magnetic film having a second thickness (m2) that is thinner than the first thickness.
The armature core (20) according to any one of claims 1 to 5. The first magnetic plate (30) has a first recess (34s) recessed at a first depth (d1) on one main surface (32s) and a first main surface (32t) on the other main surface (32t). A first protrusion (34t) protruding at a height (h1) of 1;
The first protrusion of one first magnetic plate and the other first magnetic member stacked adjacent to the first magnetic plate in the first stacking direction. Engaging the first recess of the plate;
The second magnetic plate (40) has a second recess (44s) that is recessed at a second depth (d2) on one main surface (42s) and a second recess (44t) on the other main surface (42t). A second protrusion (44t) protruding at a height of 2 (h2),
The second protrusions of one second magnetic plate and the other second magnetic member stacked adjacent to the one second magnetic plate in the second stacking direction. The second recess of the plate engages,
The thickness (t1) of the first magnetic material plate in the first lamination direction and the thickness (t2) of the second magnetic material plate in the second lamination direction are approximately the same,
The ratio of the first height to the first depth (h1 / d1) is greater than the ratio of the second height to the second depth (h2 / d2), and any of the ratios Is also greater than 1,
The armature core (20) according to any one of claims 1 to 6. The back yoke (24) is formed by laminating a plurality of the second magnetic plates (40) having substantially the same shape in plan view from the axial direction (Q) in the second laminating direction,
The recess (242) is defined by the plurality of the second magnetic plates,
The armature core (20) according to any one of claims 1 to 7. The back yoke (24a) is arranged in an annular shape centering on the rotation axis (A) on a plane with the axial direction (Q) as a normal line, and a plurality of divided bodies (24p) having substantially the same shape. Having
The armature core (20) according to any one of claims 1 to 8. A method for manufacturing the armature core (20) according to any one of claims 1 to 9,
A first step of forming one of the teeth (22, 22a, 22b, 22c) while punching a plurality of the first magnetic plates (30) with a first mold;
A second step of forming the back yoke (24, 24a) while punching a plurality of the second magnetic plates (40) with a second mold,
The pressure when punching the first magnetic plate is lower than the pressure when punching the second magnetic plate,
A method of manufacturing an armature magnetic core. A method for manufacturing the armature core (20) according to any one of claims 1 to 9,
A first step of forming one of the teeth (22, 22a, 22b, 22c) while punching a plurality of the first magnetic plates (30) with a first mold;
A second step of laminating a plurality of the second magnetic plates while punching a plurality of the second magnetic plates (40) with a second mold to form a laminate;
A third step of strongly pressing the laminate in the axial direction (Q) after the second step,
A method of manufacturing an armature magnetic core. The field element (10);
The armature core (20) according to any one of claims 1 to 9,
The field element has a plurality of field generators (12) arranged in an annular shape around the rotation axis (A) with different polarities toward the armature core,
In a plan view from the axial direction (Q), a second direction that is perpendicular to the second radial direction (Rm) around the rotation axis (A) in the field generating portion of the field generating portion. The ratio (12w1 / 22w1, 12w2) of the length (12w1, 12w2) in the width direction (Wm) and the length (22w1, 22w2) in the first width direction (Wt) of the tooth (22) in the tooth / 22w2) is a rotating electrical machine (100) that varies depending on the distance from the rotating shaft.

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