JP2008061299A - Magnetic core, armature, rotary electric machine and compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce eddy currents generated in teeth and a yoke. <P>SOLUTION: An armature 100 includes a magnetic core 1 and a winding 13. The magnetic core 1 includes the yoke 11 and the teeth 12. The yoke 11 has a magnetic plate 111 stacked in a predetermined direction 91, and has a surface 11a in the predetermined direction 91 side. The teeth 12 are circularly disposed on the surface 11a in a circumferential direction 93 around a center axis 92 along the predetermined direction 91. The teeth 12 each have a magnetic plate 121 wound centered at an axis 94 set for the position of each of them. The axis 94 is substantially parallel to the predetermined direction 91. The winding 13 is disposed on the teeth 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  The rotating electric machine has an armature and a field element. In particular, in an axial gap type rotating electrical machine, the armature and the field element face each other through an air gap that extends along a plane perpendicular to the rotation axis.

  The armature includes a yoke, a tooth provided on the yoke, and a winding wound around the tooth. The field element is rotated by a rotating magnetic field generated by the armature.

  Eddy currents are generated in the yoke and the teeth by the magnetic flux flowing in the armature. Magnetic flux flows along the rotation axis in the teeth. Therefore, for example, when magnetic steel sheets laminated in the direction along the rotation axis are employed as the teeth, the magnetic flux crosses the interface of the laminated magnetic steel sheets. For this reason, eddy currents are likely to occur in the teeth.

  For example, by adopting magnetic steel sheets stacked in a direction perpendicular to the rotation axis as teeth, the magnetic flux crossing the interface of the magnetic steel sheets is reduced, thereby reducing eddy currents. Such a technique is disclosed in Patent Document 1, for example.

  For example, a dust core may be adopted for the teeth. Even in such a case, the eddy current generated in the teeth can be reduced. Such a technique is disclosed in Patent Document 2, for example.

  In addition, Patent Document 3 discloses a technique related to the present invention.

International Publication No. 03/047070 Pamphlet JP 2005-348472 A JP 2004-7917 A

  However, according to the technique of Patent Document 1, it is difficult to form a tooth having a complicated shape. Moreover, according to the technique of Patent Document 2, the mechanical strength may be reduced.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to reduce eddy currents generated in the teeth and the yoke.

  According to a first aspect of the present invention, a magnetic core includes a yoke (11) and a central axis (92) along a predetermined direction (91), annularly along a circumferential direction (93), and in a predetermined direction of the yoke. Teeth (12) disposed on the surface (11a) on the (91) side, and the yoke has a first magnetic plate (111) laminated in the predetermined direction, and each of the teeth Has a second magnetic plate (121) wound around an axis (94) determined for each position, and the axis is substantially parallel to the predetermined direction.

  A magnetic core according to a second aspect of the present invention is the magnetic core according to the first aspect, wherein the yoke (11) has a groove (112) into which the teeth (12) are fitted in the surface (11a), The groove is annularly arranged along the circumferential direction (93) around the central axis (92).

  A magnetic core according to a third aspect of the present invention is the magnetic core according to the second aspect, wherein a part (1221) of the end surface (122) of the teeth (12) opposite to the predetermined direction (91) is provided. ) Protrudes to the opposite side of the predetermined direction, and the partial shape (1221a) viewed from the opposite side to the predetermined direction is the groove (112) viewed from the predetermined direction (91) side. ) Of the shape (112a).

  A magnetic core according to a fourth aspect of the present invention is the magnetic core according to the second aspect, wherein an end surface (122) opposite to the predetermined direction (91) of the teeth (12) is formed from the shaft (94). The farther it is, the more it retracts in the predetermined direction (91), and the inner surface of the groove (112) is along the end surface.

  A magnetic core according to a fifth aspect of the present invention is the magnetic core according to any one of the first to fourth aspects, wherein the teeth (12) are disposed at the position of the shaft (94). And the second magnetic plate (121) is wound around the core.

  A magnetic core according to a sixth aspect of the present invention is the magnetic core according to the fifth aspect, wherein the core (123) is different from the predetermined direction (91) with respect to the second magnetic plate (121). The yoke (11) has a groove (113) for fitting the protruding portion on the surface (11a) on the predetermined direction (91) side. The grooves are annularly arranged along the circumferential direction (93) around the central axis (92).

  A magnetic core according to a seventh aspect of the present invention is the magnetic core according to the fifth or sixth aspect, wherein the core (123) is made of a magnetic material, and an end of the core on the predetermined direction (91) side. (1232) protrudes with respect to the second magnetic plate (121) wound around the core along a plane perpendicular to the predetermined direction.

  The magnetic core according to an eighth aspect of the present invention is the magnetic core according to any one of the first to sixth aspects, wherein the teeth (12) are wound around the second magnetic plate ( 121) is further provided with a flange portion (124) provided at an end on the outer peripheral side surface (121b) and the predetermined direction (91) side with respect to the shaft (94), and the flange portion is magnetic. It consists of a body and protrudes with respect to the side surface in the radial direction around the axis (94).

  A magnetic core according to a ninth aspect of the present invention is the magnetic core according to the eighth aspect, wherein the flange (124) has the second magnetic body plate (121) as a core around the shaft (94). It has the 3rd magnetic body board (1241) wound.

  A magnetic core according to a tenth aspect of the present invention is the magnetic core according to the ninth aspect, wherein the third magnetic plate (1241) and the second magnetic plate (121) are formed from a single magnetic plate. Become.

  A magnetic core according to an eleventh aspect of the present invention is the magnetic core according to any one of the first to tenth aspects, wherein the maximum value of the permeability of the teeth (12) is the value of the yoke (11). It is larger than the maximum value of magnetic permeability.

  A magnetic core according to a twelfth aspect of the present invention is the magnetic core according to any one of the first to tenth aspects, wherein a saturation magnetic flux density of the yoke (11) is a saturation magnetic flux of the teeth (12). Greater than density.

  A magnetic core according to a thirteenth aspect of the present invention is the magnetic core according to any one of the first to twelfth aspects, wherein the second magnetic plate (see FIG. 121) the thickness (d2) of the second magnetic plate in the direction perpendicular to the direction in which it spirals around the axis (94) is the predetermined thickness of the first magnetic plate (111). It is smaller than the thickness (d1) in the direction of.

  A magnetic core according to a fourteenth aspect of the present invention is the magnetic core according to the thirteenth aspect, wherein the thickness (d1) of the first magnetic plate (111) is 0.2 mm or more.

  A magnetic core according to a fifteenth aspect of the present invention is the magnetic core according to the fourteenth aspect, wherein the material of the first magnetic plate (111) contains silicon.

  A magnetic core according to a sixteenth aspect of the present invention is the magnetic core according to any one of the thirteenth to fifteenth aspects, wherein the thickness (d2) of the second magnetic plate (121) is 0. 2 mm or less.

  A magnetic core according to a seventeenth aspect of the present invention is the magnetic core according to the sixteenth aspect, wherein the second magnetic plate (121) includes an amorphous material or permalloy.

  A magnetic core according to an eighteenth aspect of the present invention is the magnetic core according to any one of the first to seventeenth aspects, wherein the second magnetic plate (121) is the shaft of the teeth (12). After being wound around (94), the wound second magnetic plate is annealed.

  According to a nineteenth aspect of the present invention, an armature includes the magnetic core (1) according to any one of the first to eighteenth aspects and a winding (13) disposed on the teeth (12). .

  A rotating electric machine according to a twentieth aspect of the present invention includes the armature (100) according to the nineteenth aspect, and a field element arranged to face the armature from a predetermined direction (91) side.

  A rotating electric machine according to a twenty-first aspect of the present invention is the rotating electric machine according to the twentieth aspect, wherein the field element includes a magnet.

  A compressor according to claim 22 of the present invention is equipped with the rotating electrical machine according to claim 20 or claim 21.

  According to the magnetic core according to the first aspect of the present invention, in the armature obtained by arranging the windings on the teeth, the magnetic flux flows along a plane perpendicular to the predetermined direction in the yoke, and the predetermined value in the teeth. Flows along the direction. Therefore, the magnetic flux does not cross any of the interface formed by stacking the first magnetic plates and the interface extending in a spiral shape from the axis, which is formed by winding the second magnetic plates. Thus, eddy currents generated in the magnetic core are reduced.

  According to the magnetic core according to claim 2 of the present invention, it is easy to fix the tooth to the yoke by providing the groove in the yoke.

  According to the magnetic core according to claim 3 of the present invention, only the protruding portion of the tooth fits into the groove. Therefore, it is possible to prevent the tooth from being excessively fitted into the groove by using a portion different from a part of the end surface of the tooth.

  According to the magnetic core of a fourth aspect of the present invention, the portion of the second magnetic plate that is wound at a position close to the shaft is connected to the first magnetic plate in the inner layer of the yoke. In addition, the outer periphery of the portion and the portion of the second magnetic plate wound around the outer periphery are connected to the first magnetic plate on the outer layer side as the number of turns increases. Therefore, without crossing either the interface formed by the lamination of the first magnetic plates and the interface that is formed by winding the second magnetic plate and spreads in a spiral shape from the axis, the teeth and the yoke Magnetic flux can flow between them. Thus, the generation of eddy currents in the magnetic core is reduced.

  According to the magnetic core of claim 5 of the present invention, the second magnetic plate can be easily wound. In addition, by adopting a shape similar to the desired shape of the cross section in the predetermined direction of the tooth for the cross section in the predetermined direction of the core, the cross section of the tooth can be obtained by winding the second magnetic plate around the core. The desired shape is obtained for.

  According to the magnetic core of claim 6 of the present invention, since the teeth can be fixed to the yoke by fitting the core into the groove, the magnetic core can be easily manufactured.

  According to the magnetic core according to claim 7 or claim 8 of the present invention, in an armature obtained by winding a winding around a tooth, most of the magnetic flux flowing in a predetermined direction of the armature is linked to the winding. Can be made.

  According to the magnetic core according to claim 9 of the present invention, it is easy to form the flange portion.

  According to the magnetic core concerning Claim 10 of this invention, the tooth | gear which has a collar part can be formed only by winding one magnetic body board.

  According to the magnetic core according to the eleventh aspect of the present invention, the iron loss can be reduced with respect to the teeth whose change in magnetic flux density is larger than that of the yoke. Moreover, since the magnetic resistance in the predetermined direction is small, the magnetic flux easily flows along the predetermined direction in the teeth.

  According to the magnetic core of the twelfth aspect of the present invention, magnetic saturation is prevented from occurring in the yoke where the magnetic flux density tends to be larger than that of the teeth.

  According to the magnetic core of the thirteenth aspect of the present invention, since the thickness of the first magnetic plate is larger than that of the second magnetic plate in relation to the second magnetic plate, the strength of the yoke is increased. Rise. In terms of the relationship between the second magnetic plate and the first magnetic plate, the thickness of the second magnetic plate is smaller than that of the first magnetic plate, so that the second magnetic plate can be easily wound.

  According to the magnetic core of the fourteenth aspect of the present invention, a high strength yoke can be obtained.

  According to the magnetic core of the fifteenth aspect of the present invention, the iron loss can be reduced without lowering the strength.

  According to the magnetic core of the sixteenth aspect of the present invention, it is easy to wind the second magnetic plate.

  According to the magnetic core of the seventeenth aspect of the present invention, the thickness of the second magnetic plate can be easily set to 0.2 (mm) or less.

  According to the magnetic core of the eighteenth aspect of the present invention, it is possible to reduce the residual stress caused by the winding of the second magnetic plate, thereby preventing the deterioration of the magnetic characteristics.

  According to the armature of the nineteenth aspect of the present invention, a rotating magnetic field can be generated efficiently.

  According to claim 20 of the present invention, torque can be generated efficiently.

  According to claim 21 of the present invention, the output of the rotating electrical machine can be increased.

  According to the compressor concerning Claim 22 of this invention, a refrigerant | coolant can be compressed.

1. FIG. 1 conceptually shows an armature 100 according to an embodiment of the present invention. The armature 100 includes a magnetic core 1 and a winding 13. In FIG. 1, the magnetic core 1 and the winding 13 are shown separately in a predetermined direction 91.

  The magnetic core 1 includes a yoke 11 and a tooth 12.

  FIG. 2 shows a cross section of the yoke 11 along a predetermined direction 91. The yoke 11 has a magnetic plate 111 laminated in a predetermined direction 91, and has a surface 11a on the predetermined direction 91 side.

  The teeth 12 are disposed on the surface 11 a in a ring shape along the circumferential direction 93 around the central axis 92 along the predetermined direction 91.

  FIG. 3 conceptually shows a cross section of the tooth 12 with respect to a predetermined direction 91. Each of the teeth 12 has a magnetic plate 121 wound around an axis 94 determined for each position. The shaft 94 is substantially parallel to the predetermined direction 91.

  The magnetic plate 121 is preferably annealed after being wound. This is because the residual stress caused by winding the magnetic plate 121 can be reduced, and the deterioration of the magnetic characteristics can be prevented.

  From the viewpoint of preventing the wound magnetic body plate 121 from loosening, it is desirable to bond or mold the wound magnetic body plate 121, for example. A steel plate whose surface is covered with an adhesive film may be employed as the magnetic plate 121. The wound magnetic body plate 121 may be fitted into a coil bobbin, or the winding wire 13 may be directly wound around the wound magnetic body plate 121.

  Winding 13 is arranged on teeth 12. In FIG. 1, concentrated winding is adopted as the winding method of the winding 13. According to such a winding method, the winding 13 can be easily wound around the teeth 12. In addition, copper loss can be reduced. The winding 13 may be wound by distributed winding or wave winding.

  According to this armature, the magnetic flux flows along a plane perpendicular to the predetermined direction 91 in the yoke 11 and flows along the predetermined direction 91 in the tooth 12. Therefore, the magnetic flux does not cross any of the interface 111 a formed by stacking the magnetic plates 111 and the interface 121 a that is formed by winding the magnetic plates 121 and extends in a spiral shape from the shaft 94. Thus, eddy currents generated in the magnetic core 1 are reduced.

  FIG. 4 shows the yoke 11 and the tooth 12 separated in a predetermined direction 91. The yoke 11 has a groove 112 for fitting the tooth 12 on the surface 11a. The groove 12 is annularly arranged around the central axis 92 along the circumferential direction 93.

  According to the yoke 11, the teeth 12 can be easily fixed to the yoke 11.

  FIG. 5 shows the yoke 11 and the teeth 12 that have different shapes from those in FIG. FIG. 6 shows a cross section along the circumferential direction 93 of the yoke 11 and the teeth 12 shown in FIG. 5 and 6 show only one of the teeth 12 and a portion of the yoke 11 around the position where the tooth 12 is disposed. In FIG. 5, the magnetic plate 111 is not shown.

  A part 1221 of the end surface 122 of the tooth 12 protrudes to the side opposite to the predetermined direction 91. The shape 1221a of the part 1221 viewed from the side opposite to the predetermined direction is substantially the same as the shape 112a of the groove 112 viewed from the predetermined direction 91 side (FIG. 6).

  According to such a shape, only the protruding portion of the tooth 12 fits into the groove 112. Therefore, it is possible to prevent the tooth 12 from being excessively fitted into the groove 112 by using a portion of the end surface 122 that is different from the part 1221.

  5 and 6, the end surface 122 of the tooth 12 opposite to the predetermined direction 91 reaches the magnetic plate 111 on the inner layer of the yoke 11, so that there is a gap between the tooth 12 and the yoke 11. The ratio of the magnetic path length at the teeth 12 to the magnetic path length at the yoke 11 is increased. Therefore, when the magnetic resistance of the tooth 12 is smaller than the magnetic resistance of the yoke 11, the magnetic resistance of the magnetic core 1 is reduced with respect to the magnetic flux flowing between the tooth 12 and the yoke 11. In FIG. 6, the magnetic flux flowing from the tooth 12 to the yoke 11 is indicated by a dashed arrow.

  FIG. 7 shows a yoke 11 and a tooth 12 that have a different shape from any of FIGS. FIG. 7 shows a cross section along one circumferential direction 93 of one of the teeth 12 and a portion of the yoke 11 around the position where the teeth 12 are disposed.

  The end surface 122 of the tooth 12 retreats in a predetermined direction 91 as the distance from the shaft 94 increases. For example, the end surface 122 may recede in a predetermined direction 91 in a stepped manner as the end surface 122 moves away from the shaft 94. The inner surface of the groove 112 is along the end surface 122.

  According to this shape, a portion of the magnetic plate 121 wound at a position close to the shaft 94 is connected to the magnetic plate 111 in the inner layer of the yoke 11. In addition, the outer periphery of the portion and the portion of the magnetic plate 121 wound around the outer periphery are connected to the outer magnetic layer plate 111 as the number of turns increases. Therefore, the magnetic flux can flow between the tooth 12 and the yoke 11 without crossing both the interface 111a of the magnetic plate 111 and the interface 121a of the magnetic plate 121. Thus, the generation of eddy currents in the magnetic core 1 is reduced. In FIG. 7, the magnetic flux flowing from the tooth 12 to the yoke 11 is indicated by a dashed arrow.

  Further, when the teeth 12 are fitted into the grooves 112, stress concentration is unlikely to occur in the yoke 11.

  The teeth 12 shown in FIGS. 6 and 7 are obtained, for example, by winding a magnetic plate 121 having a width different from that in the winding direction in the direction. The end face 122 may be processed into a desired shape after the magnetic plates 121 having the same width are wound in this direction.

  8 and 9 conceptually show a cross section with respect to a predetermined direction 91 for the tooth 12 having a different aspect from that of FIG. 3. The tooth 12 has a core 123. The core 123 is disposed at the position of the shaft 94 and extends along the shaft 94. The magnetic plate 121 is wound around the core 123.

  According to the tooth 12, the magnetic plate 121 can be easily wound. In particular, in FIG. 9, a groove 1223 is provided in the core 123. At the beginning of winding the magnetic plate 121 around the core 123, the magnetic plate 121 is hooked in the groove 1223. Thereby, winding of the magnetic body plate 121 around the core 123 becomes easier. Moreover, since the magnetic plate 121 can be wound around the core 123 while applying tensile stress, the space factor of the core is increased.

  For the cross section of the core 123 in the predetermined direction 91, it is desirable to adopt a shape similar to the desired shape for the cross section of the tooth 12 in the predetermined direction 91. This is because the desired shape can be obtained for the cross section of the tooth 12 by winding the magnetic plate 121 around the core 123. Such an embodiment is illustrated, for example, in FIG.

  FIG. 10 shows a case where the core 123 has a portion 1231 that protrudes to the opposite side of the predetermined direction 91 with respect to the magnetic plate 121. The yoke 11 has a groove 113 into which the protruding portion 1231 is fitted in the surface 11a on the predetermined direction 91 side. The groove 113 is annularly arranged around the central axis 92 along the circumferential direction 93 as in the yoke 11 shown in FIG. In FIG. 10, only one of the teeth 12 and a portion around the position where the teeth 12 are arranged in the yoke 11 are shown.

  According to the tooth 12, since the tooth 12 can be fixed to the yoke 11 by fitting the core 123 into the groove, the magnetic core 1 can be easily manufactured.

  FIG. 11 conceptually shows the case where the magnetic plate 125 is provided on the tooth 12 shown in FIG. The magnetic plate 125 is made of, for example, a dust core. In FIG. 11, the magnetic plate 125, the teeth 12 and the yoke 11 are shown separated from each other in a predetermined direction 91.

  The magnetic plate 125 is provided from the predetermined direction 91 side with respect to the tooth 12. At this time, the magnetic plate 125 may be fixed to only one of the core 123 and the wound magnetic plate 121, or may be fixed to both of them. In addition, by providing the groove | channel which engages the teeth 12 in the magnetic body board 125, fixation to the teeth 12 of the magnetic body board 125 becomes easy.

  The area of the cross section with respect to the predetermined direction 91 of the magnetic body plate 125 is larger than the area of the cross section with respect to the predetermined direction 91 of the teeth 12.

  In this content, when the magnetic body plate 125 is fixed only to the core 123 and the core 123 is made of a magnetic body, it can be grasped as follows. In other words, the end portion 1232 on the predetermined direction 91 side of the core 123 protrudes with respect to the magnetic body plate 121 wound around the core 123 along a plane perpendicular to the predetermined direction 91.

  According to this aspect, most of the magnetic flux flowing in the predetermined direction 91 side of the armature 100 can be linked to the winding 13. In addition, the space factor of the windings 13 wound around the teeth 12 can be increased. Furthermore, torque ripple can be reduced in a rotating electric machine obtained by providing a field element in the armature 100. Further, since the tooth 12 is sandwiched between the magnetic plate 125 and the yoke 11 from both sides in the predetermined direction 91, loosening of the wound magnetic plate 121 is prevented. The magnetic plate 125 may be provided for the teeth 12 shown in FIG. 5, for example, and the same effect can be obtained.

  FIG. 12 conceptually shows a case where the tooth 12 shown in FIG. The flange portion 124 is provided on the end of the wound magnetic material plate 121 on the outer peripheral side surface 121b with respect to the shaft 94 and on the predetermined direction 91 side. The flange portion 124 is made of a magnetic material, and protrudes from the side surface 121b in the radial direction about the shaft 94.

  Also in this aspect, most of the magnetic flux flowing in the predetermined direction 91 side of the armature 100 can be linked to the winding 13.

  FIG. 12 particularly shows the case where the collar portion 124 is made of a magnetic plate 1241. Specifically, the magnetic plate 1241 is wound around the shaft 94 around the magnetic plate 121. This content can be grasped by using different magnetic plates 121 and 1241 for each portion having the same width in the winding direction in the direction. According to this aspect, formation of a collar part is easy.

  As shown in FIG. 12, the magnetic plate 121 and the magnetic plate 1241 are preferably made of a single magnetic plate. This is because the tooth 12 having the flange portion 124 can be formed only by winding a single magnetic plate.

2. Regarding Relationship between Yoke and Teeth (1) Material It is desirable that the maximum value of the magnetic permeability of the teeth 12 is larger than the maximum value of the magnetic permeability of the yoke 11. This is because the magnetic resistance generated in the tooth 12 is small, so that the magnetic flux easily flows in the tooth 12.

  In addition, the eddy current can be reduced in the teeth 12 where the change in magnetic flux density is larger than that of the yoke 11. Such a change in magnetic flux density is caused by, for example, rotation of a field element provided in the armature 100, PWM (Pulse Width Modulation) control executed by the armature 100, or the like. Note that the eddy current generated by the PWM control is easily induced by the carrier frequency component of the magnetic flux density.

  FIG. 13 is a graph showing actually measured values of the magnetic flux density of the magnetic flux flowing through the teeth 12 with respect to the rotation angle of the field element. The field element is provided from a predetermined direction 91 with respect to the armature 100. According to the graph shown in FIG. 13, the graph includes a waveform close to a triangular wave shape. However, when the rotation angle is in the range of 15 ° to 30 ° and 60 ° to 75 °, the shape of the graph deviates from the triangular wave shape. I understand that. That is, the magnetic flux density contains many high-order frequency components with respect to the fundamental wave.

  The saturation magnetic flux density of the yoke 11 is desirably larger than the saturation magnetic flux density of the teeth 12. This is because magnetic saturation is prevented from occurring in the yoke 11 where the magnetic flux density tends to be larger than that of the teeth 12.

  FIG. 14 is a graph showing actually measured values of the magnetic flux density of the magnetic flux flowing in the yoke 11 with respect to the rotation angle of the field element. The field element is provided from a predetermined direction 91 with respect to the armature 100. According to the graph shown in FIG. 14, it can be seen that a magnetic flux density of 1.0 (T) or more can be obtained when the rotation angle is in the range of 30 ° to 60 °. Specifically, a magnetic flux density of 1.2 (T) is obtained almost constant in the range. That is, the magnetic flux density is large in a wide range of rotation angles.

  Therefore, compared to the magnetic flux flowing in the teeth 12, the magnetic flux flowing in the yoke 11 can obtain a higher magnetic flux density in a wide range of rotation angles, and therefore higher-order frequencies included in the magnetic flux density. There are few ingredients.

(2) Thickness of Magnetic Plate Thickness d2 of magnetic plate 121 in the direction perpendicular to the direction in which magnetic plate 121 extends spirally around shaft 94 when viewed from a predetermined direction 91 (FIG. 3) ) Is preferably smaller than the thickness d1 (FIG. 2) of the magnetic plate 111 in the predetermined direction 91.

  According to this aspect, in terms of the relationship between the magnetic plate 111 and the magnetic plate 121, the thickness d1 of the magnetic plate 111 is larger than the thickness d2 of the magnetic plate 121, so that the strength of the yoke 11 is increased. Therefore, even if the yoke 11 is fixed inside the sealed container by press fitting or shrink fitting, the yoke 11 is not easily deformed.

  From the viewpoint of increasing the strength of the yoke 11, the thickness d1 of the magnetic plate 111 is preferably 0.2 (mm) or more. A more desirable thickness d1 is 0.35 (mm) or more. For example, the magnetic plates 111 can be easily connected to each other by Karamase.

  And by including silicon in the material of the magnetic body plate 111, an iron loss, especially a hysteresis loss can be reduced, without reducing intensity | strength.

  In terms of the relationship between the magnetic plate 121 and the magnetic plate 111, the thickness d2 of the magnetic plate 121 is smaller than the thickness d1 of the magnetic plate 111, so that the winding of the magnetic plate 121 is easy. Moreover, it is possible to reduce eddy currents that occur in the teeth 12 that contain many high-order frequency components in the magnetic flux density. In particular, it is desirable to reduce the thickness d2 of the magnetic plate 121 in that the induction of eddy currents due to the carrier frequency component can be suppressed.

  From the viewpoint of facilitating winding of the magnetic plate 121 and reducing the eddy current, the thickness d2 of the magnetic plate 121 is preferably 0.2 (mm) or less. By including an amorphous material or permalloy in the material of the magnetic plate 121, the thickness d2 can be reduced to 0.2 (mm) or less, and eddy current loss can be significantly reduced. Specifically, the magnetic material plate 121 formed of an amorphous material can reduce the thickness d2 to 0.025 (mm). Further, the magnetic plate 121 formed of permalloy can reduce the thickness d2 to 0.05 (mm).

3. Manufacturing Method FIG. 15 conceptually shows a method for manufacturing the armature 100. The armature 100 is divided into two or more in the circumferential direction 93. In FIG. 15, the armature 100 is divided into the same number as the number of teeth 12, and each part of the divided armature 100 is denoted by reference numeral 1001. Of course, a method of providing the teeth 12 on the single yoke 11 without dividing the armature 100 can be adopted as a method of manufacturing the armature 100.

  FIG. 16 conceptually shows the portion 1001. The portion 1001 includes each portion 114 of the divided yoke 11, a tooth 12 provided on the portion 114, and a winding 13 wound around the tooth 12. In FIG. 16, the portion 114, the tooth 12, and the winding 13 are shown separated from each other in a predetermined direction 91. Further, the magnetic core 1 shown in FIG. 4 is employed.

  The teeth 12 can be formed by winding a magnetic plate 121 around a shaft 94 (FIG. 16), or by winding a magnetic plate 121 around a core 123 as shown in FIG. .

  Both ends 123a and 123b in the predetermined direction 91 of the core 123 may extend along a plane perpendicular to the predetermined direction 91, and such a mode is illustrated in FIG. According to this shape, the magnetic plate 121 wound around the core 123 is prevented from coming off from the core 123. Furthermore, it can be possible to prevent the winding 13 from coming off from the teeth 12.

  The core 123 may be composed of a portion 1231 around which the magnetic plate 121 is wound and a portion 1232 that holds the portion 1231. This mode is illustrated in FIG. According to this aspect, even if the core 123 has a complicated shape, the core 123 can be easily formed. Note that the portion 1231 and the portion 1232 can be joined by press-fitting, adhesion, molding, or the like, for example.

  A slit shape can be adopted as the shape of the magnetic plate 121 before winding. In this case, a plurality of magnetic plates 121 can be efficiently cut out from one magnetic plate.

  The portions 1001 are arranged along the circumferential direction 93 around the central axis 92 and are connected to each other. For example, the portion 1001 may be repeatedly connected to the certain portion 1001 in the circumferential direction 93 side. According to such a manufacturing method, the winding 13 can be wound around the tooth 12 for each portion 114, so that the winding 13 can be easily wound.

  From the viewpoint of facilitating connection between the portions 1001, it is desirable that one of the portions where the portions 1001 are connected to each other has a convex shape and the other has a concave shape. Such an uneven shape can also be used for positioning when the portions 1001 are connected. For example, a wedge shape can be adopted as the uneven shape.

  Manufacturing the armature 100 in this manner is particularly desirable when the magnetic plate 125 is provided on the tooth 12 (FIG. 11). This is because it is easy to wind the winding wire 13 even after the magnetic plate 125 is provided on the tooth 12 provided in the portion 114 from the side opposite to the portion 114. Similarly, it is also desirable when the tooth 12 has a collar portion 124 (FIG. 12).

4). About the structure of a rotary electric machine A rotary electric machine can be comprised with the armature 100 mentioned above and a field element. The field element is provided to face the armature 100 from the predetermined direction 91 side. According to such a rotating electric machine, torque can be generated efficiently.

  The field element preferably has a magnet. For example, a surface magnet type or an embedded magnet type can be adopted as the field element. According to this field element, the output of the rotating electrical machine can be increased.

  The rotating electrical machine described above can be mounted on a compressor, for example. According to such a compressor, the refrigerant can be efficiently compressed. In particular, with regard to the magnetic flux flowing in a predetermined direction, by using a material having a high saturation magnetic flux density and a high magnetic permeability and a small iron loss, an operating efficiency equivalent to or higher than that of a conventional compressor can be obtained. Contributes to energy saving of equipment.

1 is a perspective view conceptually showing an armature 100 according to the present invention. 2 is a sectional view conceptually showing a yoke 11. FIG. It is sectional drawing which shows the teeth 12 notionally. FIG. 3 is a view in which a yoke 11 and a tooth 12 are separated in a predetermined direction 91. It is a perspective view which shows the yoke 11 and the teeth 12 notionally. 3 is a cross-sectional view conceptually showing a yoke 11 and a tooth 12. FIG. 3 is a cross-sectional view conceptually showing a yoke 11 and a tooth 12. FIG. It is a figure which shows notionally the cross section with respect to the predetermined direction 91 of the teeth 12. FIG. It is a figure which shows notionally the cross section with respect to the predetermined direction 91 of the teeth 12. FIG. It is a perspective view which shows the yoke 11 and the teeth 12 notionally. It is a perspective view which shows the yoke 11 and the teeth 12 notionally. It is a perspective view which shows the yoke 11 and the teeth 12 notionally. It is a figure which shows the change with respect to the rotation angle of the magnetic flux density of the magnetic flux in the teeth. It is a figure which shows the change with respect to the rotation angle of the magnetic flux density of the magnetic flux in the yoke. It is a figure which shows the manufacturing method of the armature 100 notionally. It is a figure which shows the part 1001 notionally. It is a figure which shows the part 1001 notionally. It is a figure which shows the part 1001 notionally. It is a figure which shows the part 1001 notionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic core 11 Yoke 11a Surface 12 Teeth 13 Winding 91 Predetermined direction 92 Center axis 93 Circumferential direction 94 Axis 100 Armature 111,121,1241 Magnetic body plate 112,113 Groove 112a, 1221a Shape 121b Side surface 122 End surface 123 Core 124 鍔Part 1221 Part 1231 Projected part 1232 End part d1, d2 Thickness

Claims (22)

York (11),
Teeth (12) disposed on the surface (11a) on the side of the predetermined direction (91) of the yoke in an annular shape along the circumferential direction (93) around the central axis (92) along the predetermined direction (91) And
The yoke has a first magnetic plate (111) laminated in the predetermined direction,
Each of the teeth has a second magnetic plate (121) wound around an axis (94) determined for each position,
The axis is substantially parallel to the predetermined direction;
core. The yoke (11) has a groove (112) for fitting the teeth (12) on the surface (11a),
The groove is annularly arranged along the circumferential direction (93) around the central axis (92),
The magnetic core according to claim 1. A part (1221) of the end surface (122) opposite to the predetermined direction (91) of the teeth (12) protrudes to the opposite side to the predetermined direction,
The partial shape (1221a) viewed from the side opposite to the predetermined direction is substantially the same as the shape (112a) of the groove (112) viewed from the predetermined direction (91) side.
The magnetic core according to claim 2. The end surface (122) opposite to the predetermined direction (91) of the teeth (12) retreats in the predetermined direction (91) as the distance from the shaft (94) increases.
The inner surface of the groove (112) is along the end surface,
The magnetic core according to claim 2. The teeth (12) have a core (123) arranged at the position of the axis (94) and extending along the axis,
The second magnetic plate (121) is wound around the core.
The magnetic core according to any one of claims 1 to 4. The core (123) has a portion (1231) protruding to the opposite side to the predetermined direction (91) with respect to the second magnetic plate (121),
The yoke (11) has a groove (113) for fitting the protruding portion on the surface (11a) on the predetermined direction (91) side,
The groove is annularly arranged along the circumferential direction (93) around the central axis (92),
The magnetic core according to claim 5. The core (123) is made of a magnetic material,
An end (1232) on the predetermined direction (91) side of the core is along the plane perpendicular to the predetermined direction with respect to the second magnetic body plate (121) wound around the core. Protruding
The magnetic core according to claim 5 or 6. The teeth (12)
A flange portion provided on an end of the wound side of the second magnetic body plate (121) on the outer peripheral side surface (121b) and the predetermined direction (91) side with respect to the shaft (94). 124)
Further comprising
The flange portion is made of a magnetic material and protrudes from the side surface in the radial direction centered on the shaft (94).
The magnetic core according to any one of claims 1 to 6.   The said collar part (124) has a 3rd magnetic body board (1241) wound around the said axis | shaft (94) centering | focusing on the said 2nd magnetic body board (121). core.   The magnetic core according to claim 9, wherein the third magnetic plate (1241) and the second magnetic plate (121) are made of a single magnetic plate.   The magnetic core according to any one of claims 1 to 10, wherein a maximum value of the magnetic permeability of the teeth (12) is larger than a maximum value of the magnetic permeability of the yoke (11).   The magnetic core according to any one of claims 1 to 10, wherein a saturation magnetic flux density of the yoke (11) is larger than a saturation magnetic flux density of the teeth (12).   When viewed from the predetermined direction (91), the second magnetic plate in the direction perpendicular to the direction in which the second magnetic plate (121) extends spirally around the axis (94). The magnetic core according to any one of claims 1 to 12, wherein a thickness (d2) is smaller than a thickness (d1) of the first magnetic plate (111) in the predetermined direction.   The magnetic core according to claim 13, wherein the thickness (d1) of the first magnetic plate (111) is 0.2 mm or more.   The magnetic core according to claim 14, wherein the first magnetic plate (111) includes silicon.   The magnetic core according to any one of claims 13 to 15, wherein the thickness (d2) of the second magnetic plate (121) is 0.2 mm or less.   The magnetic core according to claim 16, wherein the material of the second magnetic plate (121) includes an amorphous material or permalloy.   The said 2nd magnetic board is annealed after the 2nd magnetic board (121) is wound around the said axis | shaft (94) about the said teeth (12). The magnetic core according to claim 17. A magnetic core (1) according to any one of claims 1 to 18,
An armature comprising a winding (13) disposed on the teeth (12). The armature (100) according to claim 19,
A rotating electric machine comprising: a field element arranged to face the armature from a predetermined direction (91) side.   The rotating electric machine according to claim 20, wherein the field element includes a magnet.   A compressor equipped with the rotating electrical machine according to claim 20 or 21.

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