JP5365109B2 - Teeth, armature magnetic core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide teeth which are miniaturized, are highly precise, and have a high packing factor. <P>SOLUTION: Each of the teeth 200 plurally arranged annularly is formed by laminating first magnetic plates 202 in a diametrical direction. Each of the teeth 200 has a first trapezoid body 212 where the length Ln of a first direction of the first magnetic plate 202 arranged at the closest position to a shaft in planar view is an upper bottom and the length Lf (here, Ln&lt;Lf) of the first direction of other magnetic plate 202 arranged at more outside position of the diametrical direction than the first magnetic plate 202 is a lower bottom. A first periphery 208 of each of the first magnetic plates 202 constituting the first trapezoid body 212 bends toward the upper bottom from the lower bottom. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an armature magnetic core and an armature, and is particularly applicable to an axial gap type rotating electrical machine.

  The rotating electric machine includes an armature and a field element. In particular, in an axial gap type rotating electric machine, the armature and the field element are arranged to face each other along the rotating shaft through an air gap that extends along a plane perpendicular to the rotating shaft. The armature includes a yoke, a tooth provided on the yoke, and an armature winding wound around the tooth. The field element is rotated by a rotating magnetic field generated by the armature.

  By supplying an alternating current to the armature winding, a magnetic flux flows in the armature, and an eddy current is generated in the yoke and the teeth by the magnetic flux.

  Since the magnetic flux flows along the rotation axis in the teeth, when the magnetic steel sheet laminated along the direction parallel to the rotation axis is adopted as the tooth, the magnetic flux crosses the interface of the laminated electromagnetic steel sheets. Become. In this case, eddy current is likely to occur in the teeth. On the other hand, if the magnetic steel sheets stacked along the direction perpendicular to the rotation axis are employed as the teeth, the magnetic flux crossing the interface of the magnetic steel sheets can be reduced, and the eddy current can be reduced. Such a technique is disclosed in Patent Document 1.

  Moreover, the space factor of an armature winding improves by making the surfaces which the adjacent teeth oppose in parallel. In order to realize such a tooth with laminated magnetic steel sheets, it is necessary to punch the magnetic steel sheets into different shapes. Such a technique is disclosed in Patent Document 2.

International Publication No. 03/047070 Pamphlet JP 2005-287217 A

  FIG. 10 is a plan view of a tooth showing a conventional example. In each of the techniques disclosed in Patent Document 1 and Patent Document 2, teeth 90 formed by laminating electromagnetic steel plates 94 in holes 92 provided in a yoke (not shown) are embedded. When the electromagnetic steel plates 94 are punched into different shapes and laminated to form the teeth 90, the surface 96 that is not parallel to the lamination direction of the electromagnetic steel plates 94 has a step shape. Therefore, when the tooth 90 is embedded in the hole 92 provided in the yoke, a triangular gap (clearance) 98 is generated between the surface 96 and the hole 92. This clearance 98 becomes an air gap with respect to the magnetic flux from the teeth 90 to the yoke, and increases the magnetic resistance, which in turn increases the copper loss.

  FIG. 11 is a diagram for explaining the problem. When the teeth are formed of laminated steel sheets, the electromagnetic steel sheets are usually punched with a die, that is, a punch and a die, and these are laminated to form. However, since the edge of the punched electrical steel sheet is curved toward the punching direction, the following problems may occur.

  That is, as shown in FIG. 11, when another electromagnetic steel plate 904 larger than one electromagnetic steel plate 900 is adjacent to one electromagnetic steel plate 900 on the side where the edge 902 of the one electromagnetic steel plate 900 is curved. The edge 902 and the other electromagnetic steel plate 904 interfere with each other. Due to the interference between the two, the electromagnetic steel sheets 900 and 904 cannot be closely adjacent to each other. When the laminated electromagnetic steel sheets are fixed to each other by caulking, if caulking is provided near the center of the electromagnetic steel sheet, the thickness of the teeth (the thickness of the teeth = the thickness of the electromagnetic steel sheets × the number of laminated sheets; hereinafter, “stack thickness” ) Has a large thickness at the edge, and the dimensional variation is large. This hinders miniaturization of the armature and deteriorates productivity.

  In view of the above problems, an object of the present invention is to provide a technique for reducing the magnetic resistance between a tooth and a yoke while reducing the size, accuracy, and space factor of the tooth.

In order to solve the above problems, teeth according to this invention, a plurality of annularly arranged around a predetermined axis (Q), the tooth that serves as the core of the armature winding (20) is wound (200) Each of the teeth includes a plurality of first magnetic plates (202) stacked, and for each of the teeth, the shaft extends on an extension in the stacking direction in which the first magnetic plates are stacked. The first magnetic plate has a first main surface (204) appearing closer to the axis and a second main surface (206) appearing far from the axis, and the teeth are The area of the first main surface of the first magnetic plate is equal to the area of the first main surface of the other first magnetic plate adjacent to the second main surface of the first magnetic plate. The first region (212) is smaller than the other first magnetic body in the first region. The first edge of said first main surface of (208) that are curved towards the first magnetic plate of the one.

In the second invention and the first invention, the first region (212) has a first trapezoidal member having a substantially trapezoidal shape in a plan view from a direction along the axis, of the first trapezoidal member One of the first magnetic plates (202) disposed at a position corresponding to the first upper base is closest to the axis, and the length (Lt1) of the first upper base of the first trapezoidal body is the first. When the length is shorter than the length (Lb1) of one lower base, the first edge (208) is curved from the first lower base toward the first upper base.

In the first invention , the teeth (200) have the first main plate (202) of the first magnetic plate (202) outside the first region (212) with the axis (Q) as a center. The second region (214) in which the area of the surface (204) is larger than the area of the first main surface of the other first magnetic plate adjacent to the second main surface of the one first magnetic plate. In the second region, the first edge (208) of the first main surface of the other first magnetic plate is curved toward the one first magnetic plate. Yes.

In the second invention, the teeth (200), said axis (Q) outside than in the first region as the center (212), said second one of said first magnetic plates (202) A second region in which the area of the main surface (206) is larger than the area of the second main surface of the other first magnetic plate adjacent to the first main surface of the first magnetic plate. 214), and in the second region, the second edge (210) of the second main surface of the first magnetic plate is curved toward the other first magnetic plate. Yes.

In both the first and second aspects of the invention , the second region (21 4 ) has a second trapezoid having a substantially trapezoidal shape in the plan view, and a second upper bottom of the second trapezoid. One of the first magnetic plates (202) disposed at a position corresponding to is farthest from the axis, and the length (Lt2) of the second upper base of the second trapezoid is set to the second lower base. If the length is shorter than the length (Lb2), the length (Lb1) of the first lower bottom and the length of the second lower bottom are substantially equal. Further, the lower base of the first trapezoidal body (212) and the lower base of the second trapezoidal body (214) are joined via the third region (216) having a substantially square shape in the plan view. (200) is formed.

In the third invention , the first magnetic plate (202) closest to the axis is perpendicular to both the direction parallel to the axis and the direction in which the first magnetic plates are laminated. The length (Ln) in the direction and the length (Lf) in the first direction of the other first magnetic plate farthest from the axis are substantially equal.

A fourth invention is any one of the first to second inventions, wherein the first magnetic plate (202) closest to the axis has a direction parallel to the axis and the first magnetic body. The length (Ln) in the first direction orthogonal to any of the directions in which the plates are stacked is greater than the length (Lf) in the first direction of the other first magnetic plate farthest from the axis. short.

5th invention is either 1st or 2nd invention, Comprising: The direction parallel to the said axis | shaft of the said 1st magnetic body board (202) nearest to the said axis | shaft, and the said 1st magnetic body The length (Ln) in the first direction perpendicular to any of the directions in which the plates are laminated and the length (Lf) in the first direction of the other first magnetic plate farthest from the axis Almost equal.

A sixth invention is the invention according to any one of the first to second inventions, wherein one of the first magnetic plates (202) is laminated in a direction parallel to the axis and the first magnetic plates. A length (Lx) in a first direction orthogonal to any of the directions, and a length (Ly) in the first direction of the other first magnetic plate adjacent to the one first magnetic plate. Difference (2d) is greater than twice the length (Δ) in the first direction of the first edge (208) exhibiting curvature.

A seventh invention is any one of the first to third inventions, wherein the first magnetic plate (202) is joined to the opposing first magnetic plate by caulking (218).

An armature magnetic core according to the present invention includes a tooth (200) according to any one of the first to third aspects of the invention and an opening on one side of the shaft (Q) and the other of the shafts of the tooth. And a yoke (100) including a plurality of flat plate-like second magnetic plates (102) having recesses (104) to be filled with the armature core (10) at a position defining the recesses. The third edge (106) of the second magnetic plate is curved from the one side to the other side.

According to the teeth according to this invention, the burr by punching (edge) is to reduce the clearance between the adjacent first magnetic plate constituting the teeth, the teeth of the small and precision-Kouranaisekiritsu Can be realized. Further, the magnetic resistance between the teeth and the yoke when the teeth are fitted to the yoke is reduced.

And the burr | flash (edge) by punching can reduce the clearance between the 1st magnetic body plates which comprise a tooth, and can achieve size reduction, high precision, and high space factor of a tooth. Further, the magnetic resistance between the teeth and the yoke when the teeth are fitted to the yoke is reduced.

According to the first invention, it is easy to manufacture the teeth using the in-mold lamination technique.

According to the second invention, the burr by punching can reduce the clearance between the first magnetic plates constituting the teeth, thereby reducing the size, accuracy, and space factor of the teeth. Further, the magnetic resistance between the teeth and the yoke when the teeth are fitted to the yoke is reduced.

According to the first and second inventions, positioning is facilitated when the teeth are disposed on the yoke. Further, the coil can be easily wound.

According to the first and second aspects of the invention, when the teeth are disposed in the recess, the positioning becomes easy with reference to the first lower bottom and the second lower bottom. Further, the coil can be easily wound.

According to the fourth invention, it is easy to manufacture the teeth using the in-mold lamination technique.

According to the 3rd and 5th invention, it is easy to manufacture teeth continuously.

According to the sixth invention, it is possible to avoid or suppress the contact between the first edge of one first magnetic plate and the first edge of another adjacent first magnetic plate. Since the first magnetic plate itself is exposed by punching the first magnetic plate with the insulating coating, dielectric breakdown occurs when the first edges contact each other. The present invention can avoid or suppress this.

According to the seventh aspect , the laminated state of the first magnetic plate can be firmly maintained. Further, the first magnetic plates can be easily positioned.

According to the armature core according to the present invention , the teeth can be easily fitted.

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

<Configuration of armature core and armature>
1 is an exploded perspective view showing an armature 30 to which an armature core 10 according to an embodiment of the present invention is applied, and a partially enlarged view thereof. FIG. 2 is a plan view of a body portion 201 of a tooth 200 and a portion thereof. It is an enlarged view.

  As shown in FIG. 1, a plurality of armature cores 10 according to the present embodiment are annularly arranged around a predetermined axis Q, and teeth 200 that function as a core around which the armature winding 20 is wound, and an axis Q Plate-shaped magnetic plate having a recess 104 that is open on one side of the tooth 200 and that is fitted on the other side of the axis Q of the teeth 200 (corresponding to a “second magnetic plate” as means for solving the problem: A yoke 100 including a body plate 102). An armature 30 to which the armature core 10 is applied includes an armature winding 20, and concentrated winding is adopted as the winding method. The winding method of the armature winding 20 is not necessarily concentrated winding, and may be distributed winding or wave winding. Unless otherwise specified in the present application, the armature winding does not indicate one of the conductive wires constituting the armature winding, but indicates an aspect in which the conductive wires are wound together. The same applies to the drawings. In addition, the winding start and winding lead lines and their connections are also omitted in the drawings.

  The yoke 100 has a plurality of flat plate-like second magnetic plates 102 stacked along the axis Q, and the edge of the second magnetic plate 102 at a position defining the recess 104 (in means for solving the problem). (Corresponding to “third edge”) 106 is curved from the one side toward the other side. The recess 104 may penetrate the yoke 100, but by forming the recess 104 at a predetermined depth without penetrating, the strength of the yoke 100 can be increased and the fitting depth of the teeth 200 can be defined.

  Each tooth 200 includes a body portion 201 around which the armature winding 20 is wound, and a flange portion 203 that holds the wound armature winding 20. The body portion 201 extends in a direction parallel to the axis Q. The flange 203 protrudes in the circumferential direction of a circle centered on the axis Q at the end opposite to the side where the body 201 is fitted to the yoke 100. By projecting the flange portion 203 in the circumferential direction, a large amount of magnetic flux of the field element can be guided to the body portion 201 and can be sufficiently linked to the armature winding 20.

  It should be noted that a certain gap is necessary between adjacent flanges 203 in order to suppress or avoid leakage of magnetic flux. Specifically, it is desirable that the shortest distance between the flanges 203 is slightly more than twice the length of the air gap formed in the axial gap type rotating electrical machine.

  Each of the teeth 200 has a plurality of laminated magnetic plates (corresponding to “first magnetic plate” as means for solving the problem: hereinafter referred to as “first magnetic plate”) 202. For the teeth 200, the axis Q is located on the extension in the stacking direction in which the first magnetic plates 202 are stacked. In other words, the plurality of first magnetic plates 202 are stacked substantially along the radial direction at the center of the tooth 200. By laminating in the radial direction, the magnetic flux in the teeth 200 due to the armature reaction easily flows in the circumferential direction. This is particularly effective when the electrical load is designed to be large in a rotating electrical machine.

  Here, the body portion 201 and the flange portion 203 have a shape that appears in a state in which a plurality of first magnetic plates 202 are stacked, and each of the first magnetic plates 202 is formed in a substantially letter shape. The first magnetic plate 202 has a first main surface 204 that appears closer to the axis Q and a second main surface 206 that appears farther from the axis Q. The tooth 200 has a first region 212, and in the first region, the area of the first main surface 204 of one first magnetic plate 202 is another first magnetic layer adjacent to the first main surface 204. It is smaller than the area of the first main surface 204 of the body plate 202. In the first region 212, the first edge 208 of the first main surface 204 of the other first magnetic plate 202 is curved toward the one first magnetic plate 202.

  As a specific example, as shown in FIG. 2, the first main body of the first magnetic plate 202 disposed nth from the first magnetic plate 202 disposed closest to the axis Q. When the area of the surface 204 is Sn and the area of the first main surface of the first magnetic plate 202 arranged in the (n + 1) th is Sn + 1, the tooth 200 has a first region 212 that satisfies Sn <Sn + 1. . In the first region 212, the first edge 208 of the first main surface 204 of the (n + 1) th first magnetic plate 202 is curved toward the nth first magnetic plate 202.

  The teeth 200 are formed by punching the first magnetic plate 202 using a punch and a die and laminating them. Therefore, the edge curvature of the punched first magnetic plate 202 is formed by burrs when the first magnetic plate 202 is punched.

  As shown in FIG. 2, the first region 212 is a trapezoid having a substantially trapezoidal shape in a plan view from the direction along the axis Q (hereinafter referred to as “first trapezoid 212” using the same reference numeral 212 as the first region). Called). One first magnetic plate 202 disposed at a position corresponding to the upper base of the first trapezoid 212 (hereinafter referred to as “first upper base”) is disposed closest to the axis Q, and the first upper base 212 If the length Lt1 is shorter than the length Lb1 of the lower base of the first trapezoid 212 (hereinafter referred to as the “first lower base”), the first edge 208 extends from the first lower base to the first upper base. Curved toward.

  Further, the tooth 200 has an area of the first main surface 204 of one first magnetic plate 202 outside the first region 212 around the axis Q so that the second main surface of the first magnetic plate 202 has a second area. You may have the 2nd area | region 214 larger than the area of the 1st main surface 204 of the other 1st magnetic body board 202 adjacent to the main surface 206. FIG. Also in the second region 214, the first edge 208 of the first main surface 204 of the other first magnetic plate 202 is curved toward the one first magnetic plate 202. In addition, the curvature (burr) formed on the first edge 208 of the other first magnetic plate 202 conflicts with the second main surface 206 of the one first magnetic plate 202, and the other first magnetic plate 202 When a gap is generated between one magnetic plate 202 and the first first magnetic plate 202, a flat magnetic plate 290 may be inserted into the gap.

  As shown in FIG. 2, the second region 214 has a second trapezoid having a substantially trapezoidal shape in plan view (hereinafter referred to as “second trapezoid 214” using the same reference numeral 214 as the second region). Yes. One first magnetic plate 202 disposed at a position corresponding to the upper base of the second trapezoid 214 (hereinafter referred to as “second upper base”) is disposed farthest from the axis Q. The length Lt2 of the second upper base is set shorter than the length Lb2 of the lower base of the second trapezoid body 214 (hereinafter referred to as “second lower base”).

  The teeth 200 are formed by joining the first lower base and the second lower base. For example, the length Lb1 of the first lower base and the length Lb2 of the second lower base are substantially equal, and the first lower base and the second lower base are connected via a third region 216 that has a substantially rectangular shape in plan view. The teeth 200 are formed by bonding. As described above, the length Lb1 of the first lower base and the length Lb2 of the second lower base are substantially equal, and the lengths Lb1 and Lb2 of the lower bases are longer than the lengths Lt1 and Lt2 of the upper bases. Therefore, the body portion 201 of the tooth 200 has a width in a direction (first direction) orthogonal to both the direction parallel to the axis Q and the direction in which the first magnetic plate 202 is laminated depending on the distance from the axis Q. In other words, there is a widest region, and positioning when the teeth 200 are fitted into the recesses 104 of the yoke 100 can be facilitated and assembled without any delay. Further, the armature winding 20 can be smoothly wound without being damaged.

  When the body portion 201 of the tooth 200 has only the first trapezoidal body 212, the length Ln in the first direction of the first magnetic plate 202 closest to the axis Q is the first distance farthest from the axis Q. The length of the magnetic plate 202 is shorter than the length Lf in the first direction. Thereby, when manufacturing the teeth 200 by the in-mold lamination technique, the punches for punching the first magnetic plate 202 and the width of the die can be controlled only in one direction.

  As described in the present embodiment, for example, when the body portion 201 of the tooth 200 has the first trapezoid body 212 and the second trapezoid body 214, or further the third region 216, the axis Q is the most The length Ln in the first direction of the near first magnetic plate 202 (this first main surface is disposed at the position of the first upper bottom) and the first magnetic plate 202 farthest from the axis Q (this first plate) It is desirable that the length Lf in the first direction of the two main surfaces be disposed at the position of the second upper base is substantially equal. By making the lengths of the two substantially equal, when the teeth 200 are manufactured using the in-mold lamination technique, it is easy to continuously manufacture the plurality of teeth 200 while gradually changing the widths of the punch and the die.

  When manufacturing a plurality of teeth 200 in succession, the punch and die are controlled after punching out the first magnetic plate 202 that exhibits the first upper bottom of one tooth 200, and this is one direction (this is the teeth 200). The first magnetic plate 202 is punched out and laminated while gradually changing the width in the first direction when the first magnetic body is disposed on the yoke 100, and finally the first magnetic body presenting the second upper bottom. The board | substrate 202 is punched and this is laminated | stacked, and the said one teeth 200 is manufactured. Thereafter, the punch and die adjusted to the width of the second upper base (equal to the length Lf) are adjusted to the width of the first upper base (equal to the length Ln), and the manufacture of the other teeth 200 is started. . Therefore, the difference between the length Ln and the length Lf is arranged at the second closest position from the length Ln in the first direction and the axis Q of the first magnetic plate 202 arranged at the position closest to the axis Q. The difference between the first magnetic plate 202 and the length of the first magnetic plate 202 in the first direction is desirable in terms of controlling changes in the punch and die widths. Alternatively, the length Lf in the first direction of the first magnetic plate 202 disposed farthest from the axis Q and the first direction of the first magnetic plate 202 disposed second furthest from the axis Q. It is desirable to control the change in the punch and die width within a difference from the length of the die. In either case, it is not necessary to change the punch and die widths abruptly.

  The first magnetic plate 202 is joined to the opposing first magnetic plate 202 by caulking 218. Specifically, the convex portion 217 is formed on one surface side of the first magnetic plate 202. At this time, a concave portion 219 is formed at a position corresponding to the convex portion 217 on the other surface side of the first magnetic plate 202. When forming the teeth 200 by laminating the first magnetic plates 202, the convex portions 217 of one first magnetic plate 202 are press-fitted into the concave portions 219 of the other first magnetic plates 202 facing each other. Thus, the stacked state of the first magnetic plate 202 is firmly held. At this time, the first magnetic plates 202 can be easily positioned by forming the convex portions 217 and the concave portions 219 at predetermined positions. In the present embodiment, as shown in FIG. 2, a convex portion 217 is formed on the first main surface 204 side of the first magnetic plate 202, and a concave portion 219 is formed on the second main surface 206 side.

  3 and 4 are cross-sectional views each showing a configuration obtained when the body portion 201 is fitted into the recess 104. FIG. 3 shows a cross section perpendicular to the circumferential direction θ centered on the axis Q with reference to a direction z parallel to the axis Q and a radial direction r, and FIG. 4 shows a cross section perpendicular to the radial direction r in the direction z, The radial direction r is shown as a reference.

  By forming the yoke 100 by laminating the second magnetic plate 102 in a direction parallel to the axis Q, the magnetic flux flowing in the yoke 100 flows perpendicularly to the axis Q, and the second magnetic plate 102 is laminated. Hardly cross the border. Further, by forming the teeth 200 by laminating the first magnetic plates 202 in the radial direction, the magnetic flux flowing in the teeth 200 flows parallel to the axis Q, and the boundary where the first magnetic plates 202 are laminated. Almost does not cross. Therefore, the eddy current generated in the armature core 10 is reduced. Also, the magnetic resistance is reduced.

  Returning to FIG. 2, each of the second magnetic plate 102 and / or the first magnetic plate 202 may be coated with a heat-soluble adhesive 220. Accordingly, the second magnetic plates 102 and / or the first magnetic plates 202 can be easily joined.

  FIG. 5 is a plan view and a partially enlarged view thereof obtained when the body portion 201 is fitted into the recess 104. In the partially enlarged view, for easy understanding, the first magnetic plate 202 is drawn with a dotted line, and the first trapezoid 212 is drawn with an alternate long and short dash line. The planar shape of the recess 104 is formed to be substantially the same as the planar shape of the body portion 201 of the tooth 200. As shown in FIG. 5, the teeth 200 are disposed in the concave portion 104 with the first upper bottom facing the axis Q, and between the side edge portion 224 and the concave portion 104 sandwiched between the first upper bottom and the first lower bottom. The generated gap is smaller than the gap generated between the first upper bottom and the recess 104. Specifically, when manufacturing the armature core 10, the teeth 200 are disposed in the recess 104 while being pressed toward the axis Q without causing the first upper base and the recess 104 to contact each other. The side edge 224 side and the side edge 224 of the edge 106 defining the recess 104 are brought into contact with each other, and the tooth 200 is fixed to the recess 104.

  A region facing the first upper bottom in the edge 106 defining the recess 104 is located on the axis Q side with respect to the first upper bottom. As a result, the body portion 201 has the side edge portion 224 (and the third region 216 when the third region 216 is provided) mainly fixed to the concave portion 104 closely. By manufacturing in this way, when the teeth 200 arranged in a ring shape are compared with each other, the clearance with the recess 104 can be reduced uniformly.

<Effects as armature core and armature>
As described above, the first magnetic body plate 202 is punched into a predetermined shape, and these are stacked to form the teeth 200, whereby the burrs due to punching form the teeth 200 (the body portion 201). The clearance between the magnetic plates 202 can be reduced, and the teeth 200 can be reduced in size, accuracy, and space factor. Further, the magnetic resistance between the teeth 200 and the yoke 100 when the teeth 200 are fitted in the recesses 104 of the yoke 100 is reduced.

  Further, since the first edge 208 of the first magnetic plate 202 constituting the first trapezoidal body 212 is curved from the first lower base to the first upper base, the burr due to punching causes the teeth 200 to be deformed. The clearance between the 1st magnetic body plates 202 to comprise can be reduced, and the teeth 200 can be reduced in size, increased in accuracy, and increased in space factor. Further, the magnetic resistance between the teeth 200 and the yoke 100 when the teeth 200 are fitted in the recesses 104 of the yoke 100 is reduced.

  The first magnetic plate 202 has a second trapezoid body 214 in which the area of the first magnetic plate 202 is smaller than the area of the adjacent first magnetic plate 202, and the side of the other first magnetic plate 202 having a small area. Since the edge is curved toward the one first magnetic plate 202 having a small area, it is easy to manufacture the teeth 200 using the in-mold lamination technique.

  Further, since the length Lb1 of the first lower base and the length Lb2 of the second lower base are substantially equal, positioning is facilitated when the teeth 200 are disposed on the yoke 100. Further, the armature winding 20 can be easily wound without being damaged.

  Here, if both the bottoms are joined via the third region 216 having a substantially rectangular shape to form the teeth 200, when the teeth 200 are disposed in the recess 104, the positioning based on the both bottoms is further performed. It becomes easy. Further, the armature winding 20 can be easily wound without being damaged.

  Further, the length Ln in the first direction of the first magnetic plate 202 disposed at the position closest to the axis Q is the first direction of the first magnetic plate 202 disposed at the position farthest from the axis Q. If the length Lf is shorter than the length Lf, the teeth 200 can be easily manufactured by using the in-mold lamination technique.

  Alternatively, the length Ln in the first direction of the first magnetic plate 202 disposed at the position closest to the axis Q and the first direction of the first magnetic plate 202 disposed at the position farthest from the axis Q. If the length Lf is substantially equal, the teeth 200 are easily manufactured continuously.

  Moreover, since the laminated first magnetic plates 202 are joined together by caulking 218, the laminated state can be firmly maintained. Further, the first magnetic plates 202 can be easily positioned.

  Further, since the third edge 106 of the second magnetic plate 102 at a position defining the recess 104 of the yoke 100 is curved along the fitting direction of the tooth 200, the tooth 200 is fitted into the recess 104. Easy to match.

  Further, since the second magnetic plate 102 and / or the first magnetic plate 202 is coated with the heat-soluble adhesive 220, the laminated state can be firmly and easily maintained.

  Further, the gap generated between the side edge 224 sandwiched between the first upper bottom and the first lower bottom and the recess 104 is disposed smaller than the gap generated between the first upper bottom and the recess 104. , It is possible to reduce the magnetic resistance of the portion where the magnetic flux flows most easily.

  Further, when the armature core 10 is manufactured, the clearance between the plurality of teeth 200 and the recesses 104 can be uniformly reduced by fixing the teeth 200 in the recesses 104 while pressing the teeth 200 toward the axis Q.

  Further, by forming the armature 30 by winding the armature winding 20 around the armature core 10 as described above, a rotating magnetic field can be generated efficiently.

  Here, by setting the winding method of the armature winding 20 as concentrated winding, the tension at the time of winding the armature winding 20 contributes to maintaining the laminated state of the first magnetic plate 202, and the machine of the teeth 200 Increase strength.

<Configuration of rotating electrical machine>
FIG. 6 is an exploded perspective view illustrating a rotating electric machine (axial gap type motor) 50 constituted by the armature 30 and the field element 40 described above, and is shown separated along the axis Q. The armature 30 and the field element 40 are actually opposed to each other through a slight gap (air gap). However, in order to facilitate the understanding of the structure, the distance between the armature 30 and the field element 40 is shown wide. The structure of the field element 40 is also shown separately in the axis Q direction.

  The field element 40 is provided facing the armature 30 on the tooth 200 side. The field element 40 includes a permanent magnet 42 and a yoke 44. The permanent magnet 42 is annularly arranged around the axis Q, and the yoke 44 is provided with a hole 46 in the vicinity of the axis Q through which a rotating shaft (not shown) passes. In practice, the permanent magnet 42 and the yoke 44 are provided in close contact with each other.

  By employing the armature 30 as described above, it is possible to generate torque with high efficiency by reducing the iron loss in the armature 30. Further, when a sintered rare earth magnet is used for the permanent magnet 42, the eddy current loss inside the permanent magnet 42 is reduced, so that the output of the rotating electrical machine 50 can be increased by using the field element 40. it can. In particular, when the permanent magnet 42 is used, since the magnetic flux density in the air gap is high, a small size and high output can be realized. When the permanent magnet 42 is used, the magnetic flux flowing into and out of the tooth 200 contains a lot of harmonics and the magnetic flux density is increased. However, the use of the armature 30 described above has an effect of reducing iron loss in the tooth 200. high. Therefore, torque can be generated with high efficiency.

<Effects when applied to rotating electrical machines>
As described above, the output of the rotating electrical machine 50 is increased by configuring the rotating electrical machine 50 by disposing the field element 40 along the axis Q with respect to the armature 30 as described above.

  Moreover, since the field element 40 has the permanent magnet 42, the magnetic flux flowing through the teeth 200 contains a lot of harmonics and the magnetic flux density is increased. However, since the effect of reducing the iron loss by the teeth 200 is high, the efficiency is high. Torque can be generated.

<Compressor configuration>
FIG. 7 is a cross-sectional view showing a high-pressure dome type compressor 60 on which an axial gap type motor 50 is mounted. The rotating electrical machine 50 described above can be mounted on the compressor 60, for example. The axial gap type motor 50 is shown not on a cross section but on a side surface.

  The compressor 60 includes an airtight container 62, a compression mechanism 64, and an axial gap type motor 50. The compression mechanism unit 64 is disposed in the sealed container 62, and the axial gap motor 50 is disposed in the sealed container 62 and above the compression mechanism unit 64. The compression mechanism 64 is driven by the axial gap motor 50 via the rotary shaft 66. Here, the armature 30 described above functions as a stator and the field element 40 functions as a rotor.

  A suction pipe 68 is connected to the lower side of the sealed container 62, while a discharge pipe 70 is connected to the upper side of the sealed container 62. The refrigerant gas supplied from the suction pipe 68 is guided to the suction side of the compression mechanism 64. The outer peripheral side of the yoke 100 is fixed inside the sealed container 62, and the axial gap type motor 50 is fixed. Further, the lower end side of the rotary shaft 66 is connected to the compression mechanism portion 64.

  The compression mechanism 64 has a cylindrical main body 72, an upper end plate 74 and a lower end plate 76. The upper end plate 74 and the lower end plate 76 are respectively attached to the upper side and the lower side of the opening end of the main body 72. The rotating shaft 66 passes through the upper end plate 74 and the lower end plate 76 and is inserted into the main body 72.

  The rotation shaft 66 is instructed to be rotatable by a bearing 78 provided on the upper end plate 74 of the compression mechanism 64 and a bearing 80 provided on the lower end plate 76 of the compression mechanism 64. A crank pin 82 is provided on the rotary shaft 66 in the main body 72. A piston 84 is fitted to the crank pin 82 and driven. In the compression chamber 86 formed between the piston 84 and the corresponding cylinder, the refrigerant gas is compressed. The piston 84 rotates in an eccentric state or performs a revolving motion to change the volume of the compression chamber 86.

  When the compression gap 64 is driven by the rotation of the axial gap motor 50, the refrigerant gas is supplied from the suction pipe 68 to the compression mechanism 64, and the refrigerant gas is supplied from the compression mechanism 64 (particularly the compression chamber 86). Compress. The high-pressure refrigerant gas compressed by the compression mechanism unit 64 is discharged into the sealed container 62 from the discharge port 88 of the compression mechanism unit 64. Further, the high-pressure refrigerant gas has a groove (not shown) provided around the rotation shaft 66, a hole (not shown) penetrating the armature 30 (stator) and the field element 40 in the axis Q direction, an armature. 30 and the space between the outer periphery of the field element 40 and the inner surface of the sealed container 62 and the like, and is carried to the upper space of the axial gap type motor 50. Thereafter, the liquid is discharged to the outside of the sealed container 62 through the discharge pipe 70.

<Effect when applied to compressor>
As described above, the axial gap type motor 50 as described above is small and realizes a high torque, so that the loss in compressing the refrigerant is small.

<Modification 1>
As mentioned above, although the suitable aspect of this invention was demonstrated, this invention is not limited to the above-mentioned aspect. For example, the teeth 200 may have the following aspects.

  FIG. 8 is a plan view showing a body part 201a of a tooth 200a according to a modification of the present invention. As shown in FIG. 8, the tooth 200 a has an area of the second main surface 206 of one first magnetic plate 202 adjacent to the first main surface 204 outside the first region 212 with the axis Q as the center. The second region 214 is smaller than the area of the second main surface 206 of the other first magnetic plate 202, and the second region 214 has a second main surface 206 of the first magnetic plate 202. The second edge 210 may be curved toward the other first magnetic plate 202.

  That is, in the teeth 200a according to the modified example, of the first magnetic plates 202 that form the teeth 200a, the first magnetic plates 202 disposed between the first lower base and the second lower base are provided. The edge of the 1st magnetic board 202 arrange | positioned in the position except is curving toward both upper bases.

<Effects of Modification 1>
As described above, in the second trapezoid body 214, since the edge of each first magnetic plate 202 is curved from the second lower base to the second upper base, burrs caused by punching are caused by the teeth 200a. Thus, the clearance between the first magnetic plates 202 constituting each of the teeth 200a can be reduced, and the teeth 200a can be reduced in size, accuracy, and space factor. Further, the magnetic resistance between the teeth 200a and the yoke 100 when the teeth 200a are fitted in the recesses 104 of the yoke 100 is reduced.

<Modification 2>
FIG. 9 is a plan view showing a body portion 201b of a tooth 200b according to another modification of the present invention and a partially enlarged view thereof. As shown in FIG. 9, in the teeth 200b, a relationship of d> Δ is established between one first magnetic plate 202 and another first magnetic plate 202 adjacent to the first first magnetic plate 202. . here,
d: = | Lx−Ly | / 2
Lx: the length of one first magnetic plate 202 in the first direction,
Ly: the length of the other first magnetic plate 202 in the first direction,
Δ: The length in the first direction of the first edge 208 of one (or other) first magnetic body plate 202 exhibiting curvature is shown.

  That is, when the body portion 201b has an isosceles trapezoidal shape in plan view, the end portion of one first magnetic plate 202 and the end portion of the other first magnetic plate 202 at one end portion in the first direction. The difference d in length with respect to the portion is larger than the length Δ of the first edge 208 in the first direction.

  Note that the length Δ is a length determined by the punch and die clearance used for punching the first magnetic plate 202. Although only the first trapezoid body 212 is shown here, the same applies to the second trapezoid body 214.

<Effects of Modification 2>
The first magnetic plate 202 is coated with an insulating film before being punched, but the first magnetic plate 202 itself is exposed by peeling off the insulating film at the first edge 208 by punching. If the first edges 208 come into contact with each other in this state, dielectric breakdown occurs, which is not preferable. Therefore, the dielectric breakdown can be avoided or suppressed by arranging the adjacent first magnetic plates 202 satisfying the above relationship.

  In order to satisfy such a relationship, it is desirable to employ a material having a certain degree of hardness for the first magnetic plate 202. As a specific example, when the Vickers hardness HV is used as a reference, a region (strain accumulation region) that is curved by punching can be narrowed if HV> 200. By limiting the strain accumulation region to a narrow region, the degree of freedom in designing the tooth 200b is increased. For example, when the strain accumulation region is large, the restriction on the length of the adjacent first magnetic plate 202 in the first direction is large. However, if the strain accumulation region is small, the restriction is small.

  In addition, by adopting a material with high hardness, sufficient characteristics can be obtained without annealing, and the number of steps can be reduced.

  In the above drawings, details are exaggerated for easy understanding.

It is the disassembled perspective view which shows the armature to which the magnetic core for armatures concerning the embodiment of the present invention is applied, and its partial enlarged view. It is the top view of the trunk | drum, and its partial enlarged view. It is sectional drawing which shows the structure obtained when a trunk | drum part is fitted to a recessed part. It is sectional drawing which shows the structure obtained when a trunk | drum part is fitted to a recessed part. It is a figure which shows the teeth arrange | positioned at the yoke. It is a disassembled perspective view which illustrates the rotary electric machine comprised with the armature and the field element. It is sectional drawing which shows the high pressure dome type compressor which mounts an axial gap type motor. It is a top view which shows the trunk | drum part of the teeth which concerns on the modification of this invention. It is the top view which shows the trunk | drum of teeth which concerns on another modification, and its partial enlarged view. It is a top view of the teeth which shows a prior art example. It is a top view of teeth explaining a subject.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Core for armature 20 Armature winding 30 Armature 40 Field element 42 Magnet (permanent magnet)
50 Rotating electric machine (Axial gap type motor)
60 Compressor 100 Yoke 102 Second Magnetic Plate 104 Recess 106 Third Edge 200 Teeth 202 First Magnetic Plate 204 First Main Surface 206 Second Main Surface 208 First Edge 210 Second Edge 212 First Region (First trapezoid)
214 Second region (second trapezoid)
216 Third region 218 Caulking 220 Heat-soluble adhesive 224 Side edge Lx, Ly, Δ Length 2d Difference

Claims (8)

A plurality of teeth (200) arranged in a ring around a predetermined axis (Q) and functioning as a core around which the armature winding (20) is wound,
Each of the teeth includes a plurality of stacked first magnetic plates (202),
For any of the teeth, the shaft is located on the extension in the stacking direction in which the first magnetic plates are stacked,
The first magnetic plate exhibits a first main surface (204) appearing closer to the axis and a second main surface (206) appearing far from the axis,
In the teeth, the area of the first main surface of one of the first magnetic plates is the same as that of the other first magnetic plate adjacent to the second main surface of the one first magnetic plate. Having a first region (212) smaller than the area of the first major surface;
In the first region, the first edge (208) of the first main surface of the other first magnetic plate is curved toward the one first magnetic plate ,
The first region (212) has a first trapezoid that has a substantially trapezoidal shape in plan view from a direction along the axis;
One of the first magnetic plates (202) disposed at a position corresponding to the first upper base of the first trapezoid is closest to the axis;
When the length (Lt1) of the first upper base of the first trapezoid is shorter than the length (Lb1) of the first lower base,
The first edge (208) curves from the first lower base to the first upper base,
The teeth (200) have an area of the first main surface (204) of one first magnetic plate (202) outside the first region (212) with the axis (Q) as the center. A second region (214) larger than the area of the first main surface of the other first magnetic plate adjacent to the second main surface of the one first magnetic plate;
In the second region, the first edge (208) of the first main surface of the other first magnetic plate is curved toward the first magnetic plate,
The second region (214) has a second trapezoid having a substantially trapezoidal shape in the plan view,
One of the first magnetic plates (202) disposed at a position corresponding to the second upper base of the second trapezoid is farthest from the axis,
When the length (Lt2) of the second upper base of the second trapezoid is shorter than the length (Lb2) of the second lower base,
The length of the first lower base (Lb1) is substantially equal to the length of the second lower base,
Wherein A lower base of the lower base and the second trapezoid element (214) of the first trapezoidal member (212), joined through a third region (216) having a substantially rectangular shape in the plan view, the teeth. A plurality of teeth (200) arranged in a ring around a predetermined axis (Q) and functioning as a core around which the armature winding (20) is wound,
Each of the teeth includes a plurality of stacked first magnetic plates (202),
For any of the teeth, the shaft is located on the extension in the stacking direction in which the first magnetic plates are stacked,
The first magnetic plate exhibits a first main surface (204) appearing closer to the axis and a second main surface (206) appearing far from the axis,
In the teeth, the area of the first main surface of one of the first magnetic plates is the same as that of the other first magnetic plate adjacent to the second main surface of the one first magnetic plate. Having a first region (212) smaller than the area of the first major surface;
In the first region, the first edge (208) of the first main surface of the other first magnetic plate is curved toward the one first magnetic plate ,
The first region (212) has a first trapezoid that has a substantially trapezoidal shape in plan view from a direction along the axis;
One of the first magnetic plates (202) disposed at a position corresponding to the first upper base of the first trapezoid is closest to the axis;
When the length (Lt1) of the first upper base of the first trapezoid is shorter than the length (Lb1) of the first lower base,
The first edge (208) curves from the first lower base to the first upper base ,
The tooth (200) has an area of the second main surface (206) of one first magnetic plate (202) outside the first region (212) around the axis (Q). A second region (214) larger than the area of the second main surface of the other first magnetic plate adjacent to the first main surface of the one first magnetic plate;
In the second region, the second edge (210) of the second main surface of the first magnetic plate is curved toward the other first magnetic plate,
The second region (214) has a second trapezoid having a substantially trapezoidal shape in the plan view,
One of the first magnetic plates (202) disposed at a position corresponding to the second upper base of the second trapezoid is farthest from the axis,
When the length (Lt2) of the second upper base of the second trapezoid is shorter than the length (Lb2) of the second lower base,
The length of the first lower base (Lb1) is substantially equal to the length of the second lower base,
Wherein A lower base of the lower base and the second trapezoid element (214) of the first trapezoidal member (212), joined through a third region (216) having a substantially rectangular shape in the plan view, the teeth. A plurality of teeth (200) arranged in a ring around a predetermined axis (Q) and functioning as a core around which the armature winding (20) is wound,
Each of the teeth includes a plurality of stacked first magnetic plates (202),
For any of the teeth, the shaft is located on the extension in the stacking direction in which the first magnetic plates are stacked,
The first magnetic plate exhibits a first main surface (204) appearing closer to the axis and a second main surface (206) appearing far from the axis,
In the teeth, the area of the first main surface of one of the first magnetic plates is the same as that of the other first magnetic plate adjacent to the second main surface of the one first magnetic plate. Having a first region (212) smaller than the area of the first major surface;
In the first region, the first edge (208) of the first main surface of the other first magnetic plate is curved toward the one first magnetic plate,
The length (Ln) of the first magnetic plate (202) closest to the axis in the first direction orthogonal to both the direction parallel to the axis and the direction in which the first magnetic plates are laminated. And the length (Lf) of the other first magnetic plate farthest from the axis in the first direction are substantially equal to each other. Teeth (200) according to claim 1 or claim 2,
The length (Ln) of the first magnetic plate (202) closest to the axis in the first direction orthogonal to both the direction parallel to the axis and the direction in which the first magnetic plates are laminated. ) Is a tooth shorter than the length (Lf) in the first direction of the other first magnetic plate farthest from the axis . Teeth (200) according to claim 1 or claim 2 ,
The length (Ln) of the first magnetic plate (202) closest to the axis in the first direction orthogonal to both the direction parallel to the axis and the direction in which the first magnetic plates are laminated. And the length (Lf) of the other first magnetic plate farthest from the axis in the first direction are substantially equal to each other. Teeth (200) according to claim 1 or claim 2 ,
A length (Lx) of a first direction perpendicular to both the direction parallel to the axis and the direction in which the first magnetic plates are laminated; The difference (2d) from the length (Ly) of the other first magnetic plate adjacent to the first magnetic plate in the first direction is the value of the first edge (208) exhibiting a curvature. Teeth greater than twice the length (Δ) in the first direction . Teeth (200) according to any of claims 1 to 3 ,
The first magnetic plate (202) is a tooth that is joined to the opposing first magnetic plate by caulking (218) . Teeth (200) according to any of claims 1 to 3 ,
A yoke (100) including a plurality of flat plate-like second magnetic plates (102) having a recess (104) that is open on one side of the shaft (Q) and that fits on the other side of the shaft of the teeth;
An armature core (10) comprising :
The armature magnetic core, wherein a third edge (106) of the second magnetic plate at a position defining the recess is curved from the one side to the other side .

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