JP5332082B2 - motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce flux leakage from a rotor to enhance the efficiency of the motor. <P>SOLUTION: The motor includes the rotor 11 and an armature 21. The rotor 11 includes a field magnet 113 and first to fourth core portions 1111, 1121, 1112, 1122. The field magnet 113 has a first magnetic pole face 113a and a second magnetic pole face 113b different from each other in polarity at both its ends in a predetermined direction 91. The first and second core portions are each single and provided on the first magnetic pole face and the second magnetic pole face. The third core portions are annularly disposed around a rotating shaft 92 in the circumferential direction 93, and are all magnetically coupled with the first core portion and protruded toward the outer circumferential side. The fourth core portions are annularly disposed in the circumferential direction 93 and are all magnetically coupled with the second core portion and protruded in the same direction as the third core portions are. The armature 21 is eccentrically disposed in the circumferential direction 93 and is selectively opposed to the third and fourth core portions. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a motor, and more particularly to a motor in which armatures are provided unevenly.

  Conventionally, adoption of a motor in which an armature is unevenly distributed around a field element has been studied for an actuator or an electric vehicle.

  Below, the technique relevant to this invention is shown.

Japanese Utility Model Publication No. 5-86151 JP-A-8-98487 JP-A-9-205742 JP 2003-125568 A

  However, in the part where the field element does not face the armature, the magnetic flux easily leaks, and only a part of the magnetic flux of the field magnet can be used effectively, so the efficiency of the motor is low.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to reduce leakage of magnetic flux from a field element and increase the efficiency of a motor.

A motor according to a first aspect of the present invention is capable of rotating around a rotating shaft (92) along a predetermined direction (91) and having different polarities from each other, the first magnetic pole surfaces (113a; 1331a; 143a; 153a). And a field magnet (113; 1331, 1332; 143; 153) having a second magnetic pole face (113b; 1332a; 143b; 153b) and a single first core portion (1111) provided on the first magnetic pole face. 1311; 1411; 1511), a single second core portion (1121; 1321; 1421; 1521) provided on the second magnetic pole surface, and along the circumferential direction (93) around the rotation axis. A plurality of third core portions (1112; 1312, 1313; 1412, 1413; 1512, 1513), which are arranged in an annular shape and are all magnetically coupled to the first core portion; A fourth core portion (1122; 1322, 1323) that is annularly disposed along the circumferential direction, is magnetically coupled to the second core portion, and projects in the same direction as the third core portion. , 1422, 1423; 1522, 1523) and a plurality of field elements (11; 13; 14; 15) that are unevenly distributed in the circumferential direction, and are one of the third core portion and the fourth core portion. Armature (21; 231, 232; 231, 232; 231) facing only the portion, and the armature (231; 232) is the field element (13) viewed from the predetermined direction (91). ) Facing the field element from the predetermined direction only, the second magnetic pole surface (1332a) is located on the outer peripheral side with respect to the first magnetic pole surface (1331a), and Both the magnetic pole surface and the second magnetic pole surface are the field magnets. (1331, 1332) are located on the predetermined direction side, and the third core portions (1312, 1313) both protrude from the first core portion in the predetermined direction, and Each of the core portions (1322, 1323) protrudes from the second core portion in the predetermined direction .

Motor according to claim 2 of the invention is the motor of claim 1, wherein said field magnet (1331 and 1332), the first in the predetermined direction (91) relative to said field magnet A third magnetic pole surface (1331b) positioned opposite to the magnetic pole surface (1331a) and having a polarity different from that of the first magnetic pole surface; and the second magnetic pole in the predetermined direction with respect to the field magnet A fourth magnetic pole surface (1332b) positioned opposite to the surface (1332a) and having a polarity different from that of the second magnetic pole surface; and the field element (13) includes the third magnetic pole surface And a single magnetic body (136) provided on the surface and the fourth magnetic pole surface.

Motor according to claim 3 of the present invention, a motor according to claim 1, wherein the armature pairs (231, 232), one of said armature (232), the predetermined direction ( 91) from the side opposite to the other arm (231) of the armature via the field element (13), and the field magnets (1331, 1332) The third magnetic pole surface (1331b), which is located opposite to the first magnetic pole surface (1331a) in the predetermined direction and has a polarity different from that of the first magnetic pole surface, and the field magnet The field element further includes a fourth magnetic pole surface (1332b) positioned opposite to the second magnetic pole surface (1332a) in the predetermined direction and having a polarity different from that of the second magnetic pole surface. (13) are respectively applied to the third magnetic pole surface and the fourth magnetic pole surface. The fifth and sixth core portions (1341, 1351) are arranged in an annular shape along the circumferential direction (93), both from the fifth core portion to the side opposite to the predetermined direction. A plurality of protruding seventh core parts (1342, 1343) and an annular arrangement along the circumferential direction, all of which protrude from the sixth core part to the opposite side to the predetermined direction. And a plurality of core portions (1352, 1353).

A motor according to a fourth aspect of the present invention is the motor according to the third aspect , wherein each of the seventh core portions (1342, 1343) is opposite to the predetermined direction (91). 1343) extends between the eighth core portions (1352, 1353) adjacent to each other along the circumferential direction (93) to the outer peripheral side of the field element (13), and the eighth core portion Each of the end portions (1353) opposite to the predetermined direction extends between the seventh core portions adjacent to each other along the circumferential direction toward the rotating shaft (92).

A motor according to a fifth aspect of the present invention is the motor according to the fourth aspect, wherein the end portion (1343) of the seventh core portion (1342, 1343) and the eighth core portion (1352, 1353) are connected to each other on the outer peripheral side and the inner peripheral side, and between the end portion of the seventh core portion and the end portion of the eighth core portion. In addition, a gap extending from the inner peripheral side to the outer peripheral side is provided.

Motor according to claim 6 of the present invention, a motor according to any one of claims 1 to 5, the area of the first magnetic pole surface (1331a), the second magnetic pole surface (1332a ) Is substantially the same.

Motor according to claim 7 of the present invention, in the motor according to any one of claims 1 to 5, wherein the area of the second magnetic pole surface (1332a), the first pole face (1331a ) Larger than the area.

A motor according to an eighth aspect of the present invention is capable of rotating around a rotating shaft (92) along a predetermined direction (91), and has different first magnetic pole faces (113a; 1331a; 143a; 153a). And a field magnet (113; 1331, 1332; 143; 153) having a second magnetic pole face (113b; 1332a; 143b; 153b) and a single first core portion (1111) provided on the first magnetic pole face. 1311; 1411; 1511), a single second core portion (1121; 1321; 1421; 1521) provided on the second magnetic pole surface, and along the circumferential direction (93) around the rotation axis. A plurality of third core portions (1112; 1312, 1313; 1412, 1413; 1512, 1513), which are arranged in an annular shape and are all magnetically coupled to the first core portion; A fourth core portion (1122; 1322, 1323) that is annularly disposed along the circumferential direction, is magnetically coupled to the second core portion, and projects in the same direction as the third core portion. , 1422, 1423; 1522, 1523) and a plurality of field elements (11; 13; 14; 15) that are unevenly distributed in the circumferential direction, and are one of the third core portion and the fourth core portion. Armatures (21; 231, 232; 231, 232; 231) facing only the portion, and the armatures (231; 232) are one of the field elements viewed from the predetermined direction (91). The field magnet (143) has an annular shape along the circumferential direction (93), and the first magnetic pole surface (143a) and the second magnetic pole are opposed to the field element only from the predetermined direction. Each of the surfaces (143b) is an inner circumference of the field magnet Each of the third core portions (1412, 1413) protrudes from the first core portion in the predetermined direction, and any of the fourth core portions (1422, 1423). Projecting from the second core portion in the predetermined direction.

A motor according to a ninth aspect of the present invention is the motor according to the eighth aspect , wherein the armature forms a pair (231, 232), and one of the armatures (232) is in the predetermined direction ( 91) from the opposite side to the other armature (231) via the field element (13), and the field element (14) extends along the circumferential direction (93). A plurality of fifth core portions (1414, 1415) which are arranged in an annular shape and project from the first core portion (1411) to the opposite side of the predetermined direction (91); And a plurality of sixth core portions (1424, 1425) that are arranged in a ring shape and project from the second core portion (1421) to the opposite side to the predetermined direction.

Motor according to claim 1 0 of the present invention is the motor of claim 9, wherein the third core portion (1412 and 1413) and the fifth core portion (1414 and 1415), the predetermined When viewed from the direction (91) of FIG. 1, the layers are alternately arranged along the circumferential direction (93).

Motor according to claim 1 1 of the invention is the motor of claim 9 or claim 1 0, wherein the fifth core portion and each of said predetermined direction (1414 and 1415) (91) The opposite end portion (1415) extends between the sixth core portions (1424, 1425) adjacent to each other along the circumferential direction (93) to the outer peripheral side of the field element (14), An end portion (1425) opposite to the predetermined direction of each of the sixth core portions is between the fifth core portions adjacent to each other along the circumferential direction, on the rotating shaft (92) side. Extending to.

Motor according to claim 1 2 of the invention is the motor of claim 1 1, wherein the fifth core portion and the end portion of the (1414 and 1415) (1415), the core portion of the sixth ( 1424) are connected to each other on the outer peripheral side and the inner peripheral side, and the end of the fifth core part and the end part of the sixth core part are connected to each other. A gap extending from the inner peripheral side to the outer peripheral side is provided.

Motor according to claim 1 3 of the present invention, claims 3 to 5, a motor according to any one of claims 9 to 1 2, wherein said pair of armature (231, 232) have the same number of sets of three-phase windings, and one of the three-phase windings of the pair of armatures is arranged in the circumferential direction (93) in a certain phase sequence, The other three-phase windings of the pair of children are arranged in the circumferential direction in a phase sequence different from the phase sequence.

Motor according to claim 1 4 of the present invention, claims 3 to 5, a motor according to any one of claims 9 to 1 2, wherein said pair of armature (231, 232) have the same number of sets of three-phase windings and are arranged in the circumferential direction (93) in the same phase sequence, and one of the pair of armatures is in the circumferential direction with respect to the other. It is shifted by a predetermined angle.

The motor according to claim 15 of the present invention is rotatable around a rotation axis (92) along a predetermined direction (91) and has different first magnetic pole faces (113a; 1331a; 143a; 153a). ) And a second magnetic pole surface (113b; 1332a; 143b; 153b), and a single first core portion (113; 1331, 1332; 143; 153) provided on the first magnetic pole surface ( 1111; 1311; 1411; 1511), a single second core portion (1121; 1321; 1421; 1521) provided on the second magnetic pole surface, and along the circumferential direction (93) around the rotation axis. A plurality of third core portions (1112; 1312, 1313; 1412, 1413; 1512, 1513) that are arranged in an annular shape and are magnetically coupled to the first core portion. And a fourth core portion (1122; 1322) that are annularly arranged along the circumferential direction, both of which are magnetically coupled to the second core portion and project in the same direction as the third core portion. 1323; 1422, 1423; 1522, 1523) and a plurality of field elements (11; 13; 14; 15), which are unevenly distributed in the circumferential direction, and are provided in the third core portion and the fourth core portion. Armatures (21; 231, 232; 231, 232; 231) facing only a part of the armature (231), the field elements (15) viewed from the predetermined direction (91) The field magnet (153) has an annular shape along the circumferential direction (93), and faces the field element from the predetermined direction (91), and the first magnetic pole surface (153a). And the second magnetic pole surface (153b) with respect to the field magnet The third core portions (1512, 1513) are located on opposite sides with respect to the predetermined direction, and all of the third core portions (1512, 1513) protrude from the first core portion in the predetermined direction, and the fourth core portion (1522, 1522). 1523) protrudes in the predetermined direction from the second core portion on the inner peripheral side of the field magnet.

Motor according to claim 1 6 of the present invention, according to claim 1 to a motor according to any one of claims 1 to 5, wherein the third core portion (1312, 1313; 1412 and 1413; 1512, 1513) end portions (1313; 1413; 1513) on the predetermined direction (91) side and end portions on the predetermined direction side of the fourth core portions (1322, 1323; 1422, 1423; 1522, 1523). (1323; 1423; 1523) means that outer peripheral sides and inner peripheral sides are connected to each other, and between the end portion of the third core portion and the end portion of the fourth core portion, A gap extending from the inner peripheral side to the outer peripheral side is provided.

Motor according to claim 1 7 of the invention is the motor according to any one of claims 1 to 1 6, wherein the armature (21; 231; 232), the back yoke (211; 2311; 2321) and teeth (212) projecting from the back yoke to the field element (11; 13-15; 13, 14) side and having an end face opposite to the back yoke facing the field element. 2312; 2322) and windings (213; 2313; 2323) wound around the teeth.

Motor according to claim 1 8 of the present invention, wherein a motor of claim 1 7, wherein the armature (21; 231; 232) closest to the teeth on the edge of the said circumferential direction (93) of the (212 2312; 2322) has a cross-sectional area with respect to the protruding direction that is larger than the cross-sectional area with respect to the protruding direction of the other teeth.

Motor according to claim 1 9 of the invention is the motor of claim 1 8, wherein the teeth that are adjacent to each other along the circumferential direction (93) any distance between the (212; 2322; 2312) is Are also equal.

Motor according to claim 2 0 of the invention is the motor according to any one of claims 1 7 to claims 1-9, wherein the teeth cross sectional area relative to the direction of projection of the (212; 2322; 2312) Is larger as it is closer to the field element (11; 13 to 15; 13, 14).

Motor according to claim 2 1 of the invention is the motor according to any one of claims 1-7 to claim 2 0, the length of the said circumferential direction (93) perpendicular to the direction of the end face The third core portion (1112; 1312, 1313; 1412, 1413; 1512, 1513) or the fourth core portion (1122; 1322, 1323; 1422, 1423; 1522, 1523) in this direction. Greater than length.

A motor according to a second aspect of the present invention is the motor according to any one of the first to second aspects, wherein the armature (21; 231; 232) is at least one set of three. Has phase windings.

Motor according to claim 2 3 of the invention is the motor of 請 Motomeko 2 2, wherein the armature (21; 231; 232) has at least two sets of the 3-phase winding.
A motor according to a twenty-fourth aspect of the present invention is the motor according to any one of the first to twenty-third aspects, wherein the third core portion (1112; 1312, 1313; 1412, 1413; 1512, 1513) end portions (1112a; 1313; 1413; 1513) opposite to the respective first core portions (1111; 1311; 1411; 1511) are adjacent to each other along the circumferential direction (93). Extending between the fourth core portions (1122; 1322, 1323; 1422, 1423; 1522, 1523) and the second core portions (1121; 1321; 1421; 1521) of each of the fourth core portions. ) (1122a; 1323; 1423; 1523) on the opposite side to the third core portion adjacent to each other along the circumferential direction. Extending.
A motor according to a twenty-fifth aspect of the present invention is the motor according to any one of the first to twenty-fourth aspects, wherein the third core portion (1112; 1312, 1313; 1412, 1413; 1512, 1513) and the fourth core portion (1122; 1322, 1323; 1422, 1423; 1522, 1523) is greater than twice the distance between the field element and the armature.

According to the motors of the first , eighth, and fifteenth aspects of the present invention, the magnetic flux flowing into and out of the first magnetic pole surface can flow to any third core portion via the first core portion. Further, the magnetic flux flowing into and out of the second magnetic pole surface can flow to any fourth core portion via the second core portion. Therefore, most of the magnetic flux of the field magnet can be passed to the third and fourth core portions at positions facing the armature. In other words, leakage of magnetic flux from the third and fourth core portions at positions not facing the armature can be reduced. This increases the efficiency of the motor. Moreover, since the armature is unevenly distributed in the circumferential direction, the motor can be reduced in size. Further, each of the first magnetic pole surface and the second magnetic pole surface is a single pole and is easily magnetized. Even if the number of poles of the field element is plural, the number of field magnets provided in the field element may be small. Furthermore, it can be applied to an axial gap type motor.

According to the motor of the second aspect of the present invention, even when the armature is provided only in the predetermined direction side, the magnetic body serves as the back yoke on the side opposite to the predetermined direction with respect to the field magnet. Therefore, the motor can be driven using the magnetic flux flowing into and out of the third magnetic pole surface and the fourth magnetic pole surface. Therefore, the efficiency and output of the motor are increased.

According to the motor according to claim 3 of the present invention, the magnetic flux to and from the flow to the third pole face may also flow in the core portion of the seventh either through the core portion of the fifth. Further, the magnetic flux flowing into and out of the fourth magnetic pole surface can flow to any of the eighth core parts via the sixth core part. Therefore, most of the magnetic flux of the field magnet can be passed to the seventh and eighth core portions at positions facing the armature. Thus, when driving the motor, not only the magnetic flux flowing into and out of the first magnetic pole surface and the second magnetic pole surface but also the magnetic flux flowing into and out of the third magnetic pole surface and the fourth magnetic pole surface can be used. This increases the motor efficiency and output. Further, since the armatures are opposed to each other via the field element in a predetermined direction, the attractive force generated in the field element is balanced, so that the bearing loss caused by the rotation of the rotating shaft can be reduced.

According to the motor of the fourth aspect of the present invention, the magnetic flux flowing from the field element can be efficiently linked to the winding of the armature. Therefore, the efficiency of the motor is improved.

According to the motor of the fifth aspect of the present invention, the end portions of the seventh and eighth core portions can be integrally formed separately from the seventh and eighth core portions.

According to the motor of the sixth aspect of the present invention, the waveform in the circumferential direction of the magnetic flux generated from the third core portion and the fourth core portion can be made the same.

According to the motor of the seventh aspect of the present invention, the magnetic saturation at the end face of the fourth core portion opposite to the second core portion can be reduced.

According to the motor of the ninth aspect of the present invention, the magnetic flux flowing into and out of the first magnetic pole surface can flow to any fifth core portion via the first core portion. Further, the magnetic flux flowing into and out of the second magnetic pole surface can flow to any sixth core portion via the second core portion. Therefore, much of the magnetic flux of the field magnet can also flow through the fifth and sixth core portions at positions facing the armature, thereby increasing the efficiency of the motor.

According to the motor of the tenth aspect of the present invention, the magnetic resistance can be reduced as compared with the case where the third and fifth core portions are provided at the same position when viewed from the predetermined direction. In addition, leakage of magnetic flux can be reduced.

According to the motor according to claim 1 1 of the present invention, the magnetic flux flowing from the field element can be interlinked to the winding efficiently armature. Therefore, the efficiency of the motor is improved.

According to the motor according to claim 1 2 of the present invention, the end portion of the core portion of the fifth and sixth, separate from the fifth and the core portion of the sixth, can be molded integrally.

According to the motor according to claim 1 3 or claim 1 4 of the present invention, it is possible to reduce the cogging torque or the torque ripple.

According to the motor according to claim 1 6 of the present invention, the end portion of the third and fourth core portions, separately from the third and fourth core portions can be molded integrally.

According to the motor according to claim 1 7 of the present invention can be applied to the motor according to any one of claims 1 to 1 6.

According to the motor according to claim 1 8 of the present invention, it is possible to reduce the magnetic resistance between the nearest teeth and the field element to the end of the armature.

According to the motor according to claim 1 9 of the present invention, it is possible to increase the space factor of the windings.

According to the motor according to claim 2 0 or claim 2 1 of the present invention, it is possible to interlinked many of the magnetic flux flowing from the field element to the winding.

According to the motor according to claim 2 2 of the present invention, it tends to generate a rotating magnetic field to the armature.

According to the motor according to claim 2 3 to the present invention, as compared with the case where the three-phase windings are provided only one set, the magnetic flux leaking at both ends of the circumferential direction of the armature, relative to the total magnetic flux generated in the armature The ratio can be reduced.
According to the motor of the twenty-fourth aspect of the present invention, the magnetic flux flowing from the field element can be efficiently linked to the winding of the armature. Therefore, the efficiency of the motor is improved.
According to the motor of the twenty-fifth aspect of the present invention, the magnetoresistance between the third core portion and the fourth core portion is caused between the first magnetic pole surface and the second magnetic pole surface via the armature. Since the magnetic resistance when the magnetic flux flows, that is, the magnetic resistance of the magnetic path interlinking with the armature winding, becomes larger, it is possible to prevent a short circuit of the magnetic flux in the field element.

First embodiment.
FIG. 1 conceptually shows a motor according to the present embodiment. The motor includes a field element 11 and an armature 21. The field element 11 can rotate around a rotation axis 92 along a predetermined direction 91.

  FIG. 2 conceptually shows the field element 11. The field element 11 includes cores 111 and 112 and a field magnet 113. In FIG. 2, the core 111 is shown shifted in a predetermined direction 91 with respect to the field magnet 113, and the core 112 is shown shifted in the opposite direction to the predetermined direction 91.

  The field magnet 113 has a first magnetic pole surface 113a and a second magnetic pole surface 113b having opposite polarities at both ends in the predetermined direction 91, respectively. For example, the field magnet 113 has an N pole on the first magnetic pole surface 113a and an S pole on the second magnetic pole surface 113b. Note that the polarity of the field magnet 113 is obtained, for example, by magnetization. Magnetization may be performed after the field element 11 is obtained using the field magnet 113. In this case, for example, an air-core coil is used. Further, after the field element 11 is incorporated in the armature 211, it can be magnetized in a state assembled as a motor. Since the first magnetic pole surface 113a and the second magnetic pole surface 113b are each a single pole, magnetization is easy.

  The core 111 has a single first core part 1111 and a plurality of third core parts 1112. The core 112 has a single second core part 1121 and a plurality of fourth core parts 1122.

  The first core portion 1111 is provided on the first magnetic pole surface 113a. The second core portion 1121 is provided on the second magnetic pole surface 113b.

  Each of the third core portions 1112 is annularly arranged around the rotation shaft 92 along the circumferential direction 93, and both are magnetically coupled to the first core portion 1111. In FIG. 1, the third core portions 1112 are provided at intervals of 90 ° around the rotation shaft 92. The third core portions 1112 protrude from the first core portion 1111 to the outer peripheral side.

  Each of the fourth core portions 1122 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the second core portion 1121. In FIG. 1, the fourth core portions 1122 are provided at 90 ° intervals around the rotation shaft 92. In addition, when viewed from the predetermined direction 91, the fourth core portions 1122 and the third core portions 1112 are alternately arranged at 45 ° intervals around the rotation shaft 92. Each of the fourth core portions 1122 protrudes from the second core portion 1121 in the same direction as the direction in which the third core portion 1112 protrudes from the first core portion 1111, that is, toward the outer peripheral side.

  In FIG. 2, the widths of the third and fourth core portions 1112 and 1122 increase with respect to the radial direction in the radial direction, but may be the same in the radial direction. However, the width may be reduced as it goes in the radial direction.

  Each outer end 1112 a of the third core portion 1112 extends between the fourth core portions 1122 adjacent to each other along the circumferential direction 93. It can be understood that the end portion 1112a is located on the side opposite to the first core portion 1111. The shape of the third core portion 1112 is commonly referred to as “claw pole shape”. The same applies to the shape of the fourth core portion 1122 described below.

  Each of the end portions 1122 a on the outer peripheral side of the fourth core portion 1122 extends between the third core portions 1112 adjacent to each other along the circumferential direction 93. It can be understood that the end portion 1122a is located on the opposite side to the second core portion 1121.

  From the viewpoint of preventing a short circuit of magnetic flux, it is desirable that the third core portion 1112 and the fourth core portion 1122 are not in contact with each other. It is particularly desirable that the distance between the third and fourth core portions 1112 and 1122 be greater than twice the gap length. This is because the magnetoresistance between the third and fourth core portions 1112 and 1122 is more than the magnetoresistance when the magnetic flux flows between the first magnetic pole surface 113a and the second magnetic pole surface 113b via the armature 21. This is because the magnetic flux can be prevented from being short-circuited between the third and fourth core portions 1112 and 1122 in the field element 11 due to the increase. Here, the gap length is a distance between an armature 21 described later and the field element 11.

  In any one of the third and fourth core portions 1112 and 1122, in consideration of the fact that the end portions 1112a and 1122a extend between the other, the rotation shaft 92 of the third and fourth core portions 1112 and 1122 is set. The center angle θ1 (FIG. 2) as the center is preferably 45 ° or less in view of the structure. Considering that a gap is provided between the third and fourth core portions 1112, 1122, it is particularly desirable that the central angle θ1 is slightly smaller than 45 °.

  Since the outer peripheral surfaces of the third and fourth core portions 1112, 1122 are magnetized to the N pole and the S pole, respectively, the field element 11 has eight poles on the outer peripheral side. That is, only by providing one field magnet 113 on the field element 11, eight poles can be obtained. Therefore, the amount of magnets can be reduced. In addition, N poles and S poles are alternately arranged around the rotation shaft 92 in the field element 11 viewed from the outer peripheral side. In FIG. 2, N poles and S poles are alternately arranged at 45 ° intervals. Further, when the magnetic pole boundary is provided in the same plane, the leakage magnetic flux between the magnetic poles can be greatly reduced as compared with, for example, multipolar magnetization on the first magnetic pole surface and the second magnetic pole surface. Details will be described later.

  The armature 21 is unevenly distributed in the circumferential direction 93 and selectively faces the third core portion 1112 and the fourth core portion 1122. Specifically, it faces the field element 11 only at a part of the outer peripheral side of the field element 11.

  The armature 21 includes a back yoke 211, a tooth 212, and a winding 213. The back yoke 211 extends along the circumferential direction 93 at a part of the outer peripheral side of the field element 11. The teeth 212 protrude from the back yoke 211 toward the field element 11, and the end surface opposite to the back yoke 211 faces the field element 11. In FIG. 1, six teeth 211 are provided.

  Winding 213 is wound around teeth 211. In FIG. 1, a winding 213 is wound around each of the teeth 211 by a concentrated winding method. However, as shown in FIG. 3, the winding 213 may be wound around the teeth 211 in a distributed winding manner. In FIG. 3, such windings are denoted by reference numerals 2131 to 2133. When the distributed winding is employed, harmonics included in the generated rotating magnetic field can be reduced, and thus vibration and noise are reduced. In FIG. 3, the armature 21 has seven teeth 211, and the same applies to FIG. 4 described below.

  Further, as shown in FIG. 4, the winding 213 may be wound around the back yoke 211 by a toroidal winding method. In FIG. 4, such a winding is denoted by reference numeral 2134. When the toroidal winding method is adopted, the thickness in the predetermined direction 91 of the portion around which the winding 2134 of the back yoke is wound may be reduced.

  As viewed from the predetermined direction 91, the central angle of the armature 21 around the rotation axis 92 is preferably 180 ° or less. This is because the field element 11 can be attached to the armature 21 from the direction perpendicular to the rotation shaft 91, so that the motor can be easily manufactured.

  It is desirable that the cross-sectional area with respect to the protruding direction of the teeth 211 is larger as it is closer to the field element 11. This is because most of the magnetic flux flowing from the field element 11 can be linked to the winding. In FIG. 1, the end of the teeth 211 on the field element 11 side extends along the circumferential direction 93. FIG. 5 shows a case where the end portion extends in a predetermined direction 91.

  In FIG. 1, the end of the winding 213 in the predetermined direction 91 protrudes in the predetermined direction 91 with respect to the back yoke 211, but as shown in FIG. It is desirable that the end of the back yoke 211 be at the same position because the motor can be miniaturized.

  Specifically, if the length of the back yoke 211 in the predetermined direction 91 is increased in order to align the end of the back yoke 211 with the end of the winding 213, the cross-sectional area of the back yoke 211 can be increased. The outer diameter can be reduced. On the other hand, if the length of the teeth 211 in the predetermined direction 91 is reduced in order to align the end of the back yoke 211 with the end of the winding 213, the thickness of the motor in the predetermined direction 91 can be reduced. At this time, it is more preferable that the portion of the tooth 211 facing the field element 11 is longer in the predetermined direction 91 than the portion of the tooth 211 around which the winding 213 is wound.

  The ends of the third and fourth core portions 1112, 1122 in the predetermined direction 91 are desirably aligned with the ends in the predetermined direction 91 of the end surfaces on the inner peripheral side of the teeth 211. This is because the third and fourth core parts 1112 and 1122 and the end surfaces of the teeth 211 face each other with their ends aligned, so that the magnetic flux is applied to the rotating shaft 92 in the armature core constituted by the back yoke 211 and the teeth 212. This is because it is easy to flow along a plane perpendicular to the armature, and therefore, it is possible to employ a laminate of electromagnetic steel sheets in a predetermined direction 91 on the armature core.

  For the winding 213, for example, a three-phase winding is employed. By adopting a three-phase winding, a rotating magnetic field can be generated in the armature 21.

  In FIG. 1, since the armature 21 has six windings 213, two sets of three-phase windings can be adopted for the winding 213. By providing two sets of three-phase windings on the stator 21, the influence at the end in the circumferential direction 93 of the stator 21 is reduced as compared with the case where a set of three-phase windings is provided on the armature 21.

  The cross-sectional area of the teeth 212 closest to the end in the circumferential direction 93 of the armature 21 is preferably larger than the cross-sectional area of the other teeth 212 in the protruding direction. This is because the magnetic resistance between the tooth 212 close to the end and the field element 11 can be reduced.

  It is desirable that the distances between the teeth 212 adjacent to each other along the circumferential direction 93 are equal in that the space factor of the winding 213 can be prevented from decreasing. The same applies to the case where the cross-sectional area of the tooth 212 close to the end of the armature 21 is increased as described above.

  According to the motor of the present embodiment, the magnetic flux flowing into and out of the first magnetic pole surface 113a can flow to any third core part 1112 via the first core part 1111. Further, any magnetic flux flowing into and out of the second magnetic pole surface 113b can also flow to the fourth core portion 1122 via the second core portion 1121. Therefore, most of the magnetic flux of the field magnet 113 can flow to the third and fourth core portions 1112 and 1122 at positions facing the armature 21. In other words, leakage of magnetic flux from the third and fourth core portions 1112 and 1122 at positions not facing the armature 21 can be reduced. In addition, even when the magnetization of the field magnet 113 is uneven, the influence is small. This increases the efficiency of the motor.

  Moreover, since the end portions 1112a and 1122a extend between the other one of the third and fourth core portions 1112 and 1122, the magnetic flux flowing from the field element is efficiently transferred to the winding of the armature 21. Can be interlinked. Therefore, the efficiency of the motor is further increased.

  Furthermore, since the armature 21 is unevenly distributed in the circumferential direction 93, the motor can be reduced in size.

  In order to facilitate the flow of magnetic flux from the field magnet 113 to the third and fourth core portions 1112 and 1122, the field magnet 113 is disk-shaped and has a thickness in a predetermined direction 91 of the field magnet 113. It is preferable that the outer peripheral side of the rotating shaft 92 is smaller. This is because the thickness of the first and second core portions 1111 and 1121 in the predetermined direction 91 can be increased toward the outer peripheral side without increasing the length of the field element 11 in the predetermined direction 91. Therefore, the magnetic path cross-sectional areas of the first and second core portions 1111 and 1121 increase toward the outer peripheral side, and thus the magnetic flux easily flows through the first and second core portions 1111 and 1121 toward the outer peripheral side. Because. Furthermore, in such a shape, the areas of the first magnetic pole surface 113a and the second magnetic pole surface 113b are increased, so that the amount of magnetic flux is increased.

  The motor can be installed in an air conditioner such as an air conditioner indoor unit, or can be employed in a fan motor or the like. In this case, for example, a member provided in the air conditioner may approach the field element 11 from the side opposite to the armature 21. In particular, when the member is a magnetic body, it is desirable that the distance between the member and the armature 11 is greater than twice the gap length in order to prevent a short circuit of magnetic flux to the member.

  Most of the magnetic flux in the first and second core portions 1111 and 1121 flows between the third and fourth core portions 1112 and 1122 and the field magnet 113, and therefore can flow in either direction. Therefore, it is desirable to employ dust cores for the first and second core portions 1111 and 1121.

  Most of the magnetic flux in the third and fourth core portions 1112 and 1122 flows along a plane including the rotation shaft 92 that is determined for each of the third and fourth core portions 1112 and 1122. Therefore, what laminated | stacked the electromagnetic steel plate in the circumferential direction 93 is employable as the 3rd and 4th core parts 1112 and 1122.

  The first and second core parts, such as when the first and second core parts 1111 and 1121 are laminated with dust cores and the third and fourth core parts 1112 and 1122 are laminated with magnetic steel sheets, respectively. In the case where 1111 and 1121 and the third and fourth core portions 1112 and 1122 are manufactured separately, the first and second core portions 1111 and 1121 and the third and fourth core portions 1112 and 1122 are manufactured. And cores 111 and 112 are obtained.

  FIG. 6 conceptually shows the field element 11 pierced by a shaft 94 that can rotate about a rotating shaft 92. When the shaft 94 is made of a magnetic material, it is desirable to fit the field element 11 to the shaft 94 via a non-magnetic material 941. This is because a short circuit of the magnetic flux from one of the first magnetic pole surface 113a and the second magnetic pole surface 113b of the field magnet 113 to the other can be prevented.

  From the viewpoint of preventing magnetic flux short-circuiting, the shaft 94 may be provided in at least one of the first and second core portions 1111 and 1121 without penetrating the field element 11. When the shaft 94 is made of a non-magnetic material, the magnetic flux is not short-circuited even if the shaft 94 passes through the field magnet 113.

  From the same viewpoint, the end of the first core portion 1111 on the shaft 94 side may recede to the outer peripheral side of the shaft 94, and the field magnet 113 may be buried between the end and the shaft 94. FIG. 7 conceptually shows the shape of the field magnet 113 used in this mode. That is, the first magnetic pole surface 113 a of the field magnet 113 protrudes in the predetermined direction 91 around the shaft 94.

  According to this aspect, even when the shaft 94 is made of a magnetic material, a short circuit of magnetic flux through the shaft 94 is unlikely to occur between the first magnetic pole surface 113a and the second magnetic pole surface 113b. This is because almost no magnetic flux flows inside the field magnet 113. That is, the portion of the field magnet 113 that fills the space between the first core portion 1111 and the shaft 94 exhibits the same characteristics as the nonmagnetic material 941.

  Similarly, the end of the shaft 94 of the second core portion 1121 may recede from the shaft 94 toward the outer peripheral side, and the field magnet 113 may fill the space between the end and the shaft 94. That is, the second magnetic pole surface 113 b of the field magnet 113 may protrude around the shaft 94 to the side opposite to the predetermined direction 91. Also according to this aspect, a short circuit of the magnetic flux can be prevented.

  FIG. 8 conceptually shows a motor having armatures 21 and 22 in pairs. The armature 22 is configured in the same manner as the armature 21 and is provided apart from the armature 21. In FIG. 8, the windings of the armatures 21 and 22 are not shown.

  According to the motor, the output can be increased, and the armatures 21 and 22 are provided apart from each other, so that the thickness of the motor in the direction perpendicular to the rotation shaft 92 can be reduced.

  From the viewpoint of reducing the thickness of the motor, it is desirable that the armatures 21 and 22 face each other through the field element 11. In addition, in this case, the attractive force generated in the field element 11 is balanced, and the bearing loss can be reduced. On the other hand, when only one armature 21 or 22 is provided, or when the armatures 21 and 22 are not provided facing each other, the attractive force generated in the field element 11 is not balanced. This is likely to cause wobbling.

  Furthermore, the maximum value of the length of the armatures 21 and 22 in the direction perpendicular to the direction in which the armature 21 faces is substantially equal to the outer diameter of the field element 11 or smaller than the outer diameter. It is particularly desirable. This is because the thickness of the motor can be made equal to the length of the field element in this direction, and the motor can be miniaturized.

  By reducing the thickness of the motor, the thickness of an air conditioner or the like on which the motor is mounted can be reduced.

  In the present embodiment, the end portion 1112a of the third core portion 1112 does not extend between the fourth core portion 1122, and the end portion 1122a of the fourth core portion 1122 is also the third core portion. Even if it does not extend between 1112, a large amount of magnetic flux can be passed through the third and fourth core portions 1112 and 1122 at positions facing the armature 21. However, as described above, it is desirable to extend the end portion 1112a between the fourth core portion 1122 and the end portion 1122a between the third core portion 1112 in terms of increasing the efficiency of the motor.

Second embodiment.
FIG. 9 conceptually shows the motor according to the present embodiment. The motor includes a field element 13 and armatures 231 and 232. The field element 13 can rotate around a rotation axis 92 along a predetermined direction 91. In FIG. 9, the armature 231 is shown shifted from the field element 13 in a predetermined direction 91, and the armature 232 is shown shifted from the side opposite to the predetermined direction 91.

  FIG. 10 conceptually shows the field element 13. The field element 13 has cores 131, 132, 134, 135 and field magnets 1331, 1332. In FIG. 10, the cores 131 and 132 are shown shifted in the predetermined direction 91 with respect to the field magnets 1331 and 1332, and the cores 134 and 135 are shown shifted in the opposite direction to the predetermined direction 91.

  The field magnet 1331 has a first magnetic pole surface 1331a and a third magnetic pole surface 1331b having different polarities at both ends in the predetermined direction 91, respectively.

  The field magnet 1332 is located on the outer peripheral side of the field magnet 1331, and the field magnet 1332 has a second magnetic pole surface 1332a and a fourth magnetic pole surface 1332b having different polarities at both ends in the predetermined direction 91, respectively. .

  The field magnets 1331 and 1332 may be made of a material having a low specific resistance, for example, a sintered rare earth magnet, mainly a neodymium magnet. In this case, it is desirable to employ a material having a high specific resistance, for example, a dust core, for the cores 131, 132, 134, 135 described later. This is because even if the motor is driven by an inverter capable of PWM (Pulse Width Modulation) control, eddy current loss due to the high frequency component of the magnetic flux hardly occurs.

  The first magnetic pole surface 1331a and the second magnetic pole surface 1332a have different polarities, and both are located on the predetermined direction 91 side with respect to the field magnets 1331 and 1332. The third magnetic pole surface 1331b and the fourth magnetic pole surface 1332b have different polarities, and both are located on the opposite side of the predetermined direction 91 with respect to the field magnets 1331 and 1332.

  For example, the field magnet 1331 has an N pole on the first magnetic pole surface 1331a and an S pole on the third magnetic pole surface 1331b, and the field magnet 1332 has an S pole on the second magnetic pole surface 1332a and a fourth magnetic pole. Each of the surfaces 1332b has an N pole.

  If the field magnet 1331 and the field magnet 1332 are viewed as one field magnet, it can be understood that the field magnet has a first magnetic pole surface 1331a and a second magnetic pole surface 1332a having different polarities. it can.

  The core 131 includes a single first core portion 1311, a plurality of third core portions 1312, and a magnetic body plate 1313. The core 132 includes a single second core part 1321, a plurality of fourth core parts 1322, and a magnetic plate 1323.

  The first core portion 1311 is provided on the first magnetic pole surface 1331a. The second core portion 1321 is provided on the second magnetic pole surface 1332a.

  It is desirable that the first core portion 1311 and the second core portion 1321 be provided with a distance of twice the gap length. This is because the magnetic resistance between the first and second core portions 1311 and 1321 in the field element 13 is caused by the magnetic flux between the first magnetic pole surface 1331a and the second magnetic pole surface 1332a via the armature 231. This is because the magnetic resistance is larger than that in the case of flowing, and thus the magnetic flux can be prevented from being short-circuited between the first and second core portions 1311 and 1321 in the field element 13. Here, the gap length is a distance between an armature 231 described later and the field element 13.

  For example, the first and second core portions 1311 and 1321 are molded with resin, and the space between the first core portion 1311 and the second core portion 1321 is filled with a nonmagnetic material, thereby increasing the magnetic resistance. good.

  Further, it is desirable that the first core portion 1311 and the second core portion 1321 are smaller than the thickness of the field magnets 1331 and 1332 in the predetermined direction 91. According to this aspect, even if the magnetic flux excessively flows into the field element 13 due to a large current flowing in the winding 2313 of the armature 231 described later, the magnetic flux is excessively flowed into the first core portion 1311 and the second core portion. Shorted to 1321. Therefore, demagnetization of the field magnets 1331 and 1332 can be prevented.

  Each of the third core portions 1312 is annularly disposed around the rotation shaft 92 along the circumferential direction 93, and both are magnetically coupled to the first core portion 1311. In FIG. 10, the third core portions 1312 are provided at intervals of 90 ° around the rotation shaft 92. The third core portions 1312 protrude from the first core portion 1311 in a predetermined direction 91, respectively.

  Each of the fourth core parts 1322 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the second core part 1321. In FIG. 10, the fourth core portions 1322 are provided at 90 ° intervals around the rotation shaft 92. In addition, the fourth core portion 1322 and the third core portion 1312 are alternately arranged around the rotation shaft 92 at 45 ° intervals when viewed from the outer peripheral side. The fourth core portion 1322 protrudes from the second core portion 1321 in the same direction as the direction in which the third core portion 1312 protrudes from the first core portion 1311, that is, in a predetermined direction 91. .

  In FIG. 10, the length of the third core portion 1312 in the circumferential direction 93 is the same in the predetermined direction 91, but the length may decrease as the predetermined direction 91 is reached, for example. The same applies to the fourth core portion 1322. Further, when the third and fourth core portions 1312, 1322 and the like have corners, they may be chamfered or rounded.

  The magnetic plate 1313 is provided on the third core portion 1312 from the predetermined direction 91 side, and extends between the fourth core portions 1322 adjacent to each other along the circumferential direction 93. If the magnetic plate 1313 and the third core portion 1312 are viewed as one third core portion, the magnetic plate 1313 is opposite to the first core portion 1311 of the third core portion. It can be grasped as an end. Then, it can be understood that the end portion extends between the fourth core portions 1322 adjacent to each other along the circumferential direction 93.

  The magnetic body plate 1323 is provided on the fourth core portion 1322 from the predetermined direction 91 side, and extends between the third core portions 1312 adjacent to each other along the circumferential direction 93. If the magnetic plate 1323 and the fourth core portion 1322 are viewed as one fourth core portion, the magnetic plate 1323 is opposite to the second core portion 1321 of the fourth core portion. It can be grasped as an end. Then, it can be grasped that the end portion extends between the third core portions 1312 adjacent to each other along the circumferential direction 93.

  From the viewpoint of preventing magnetic flux short-circuiting, the magnetic plate 1313, the magnetic plate 1323, and the fourth core portion 1322 are not in contact with each other, and the magnetic plate 1323 and the third core portion 1312 are not in contact with each other. It is desirable that they are not in contact with each other.

  As shown in FIG. 11, the magnetic plates 1313 and 1323 are connected to the outer peripheral sides and the inner peripheral sides of the magnetic plates 1313 and 1323, respectively, and between the magnetic plates 1313 and 1323 from the inner peripheral side. You may provide the space | gap extended to an outer peripheral side. According to such a shape, a short circuit of magnetic flux can be prevented, and the magnetic plates 1313 and 1323 can be formed integrally.

  Furthermore, since the mutual positional relationship can be determined by connecting the magnetic plate 1313 and the magnetic plate 1323, the third and fourth core portions connected to the magnetic plates 1313 and 1323, respectively. The positions of 1312, 1322 are also determined. In the motor obtained by providing the armature 231 from the predetermined direction 91 by connecting the magnetic plates 1313 and 1323 at the same position in the predetermined direction 91, the magnetic plates 1313 and 1323 and the armature 231 The distance between each can be equal. Therefore, the armature 231 can be brought close to the field element 13 with high accuracy.

  The width of the gap provided between the magnetic plate 1313 and the magnetic plate 1323 in the extending direction is desirably larger than twice the gap length. Because, when the magnetic flux flows between the first magnetic pole surface 1313a and the second magnetic pole surface 1323a via the air gap, the magnetic resistance becomes larger than the magnetic resistance when the magnetic flux flows through the armature 231 described later, This is because a short circuit of the magnetic flux in the field element 13 can be prevented. From the same viewpoint, the distance between the magnetic plate 1313 and the fourth core portion 1322 and the distance between the magnetic plate 1323 and the third core portion 1312 are also larger than twice the gap length. It is desirable.

  The gap may be inclined with respect to the radial direction about the central axis 92. With such a shape, the cogging torque generated in the motor can be reduced. Further, even if the gaps are provided at unequal intervals in the circumferential direction, the same effect can be obtained.

  From the viewpoint of reducing the cogging torque, even if the surfaces of the magnetic plates 1313 and 1323 on the predetermined direction side, that is, the surface that can face the armature 231 described later, have a convex shape near the center in the circumferential direction 93. good.

  Considering that the magnetic plate 1313 extends between the fourth core portion 1322 and the magnetic plate 1323 extends between the third core portion 1312, the third and fourth core portions 1312 and 1322, respectively. The central angle θ2 (FIG. 10) about the rotation axis 92 is desirably 45 ° or less.

  Since the surfaces on the predetermined direction 91 side of the magnetic plates 1313 and 1323 are respectively magnetized to the N pole and the S pole, the field element 13 has eight poles on the predetermined direction 91 side. That is, by providing the field element 13 with two field magnets 1331 and 1332, eight poles can be obtained. Therefore, the amount of magnets can be reduced. In addition, N poles and S poles are alternately arranged around the rotation shaft 92 in the field element 13 viewed from the predetermined direction 91. In FIG. 10, N poles and S poles are alternately arranged at 45 ° intervals.

  It is desirable that the magnetic plates 1313 and 1323 viewed from the predetermined direction 91 have the same shape. This is because the waveform of the magnetic flux in the circumferential direction 93 can be the same between the magnetic plate 1313 and the magnetic plate 1323, thereby reducing vibration and noise.

  Also, from the viewpoint of making the magnetic flux waveform in the circumferential direction 93 the same between the magnetic plate 1313 and the magnetic plate 1323, it is desirable that the amount of magnetic flux generated from each of the field magnets 1331 and 1332 be the same.

Specifically, when the material of the field magnets 1331 and 1332 and the thickness in the predetermined direction 91 are the same, the area of the first magnetic pole surface 1331a and the area of the second magnetic pole surface 1332a are made equal. Thus, the magnetic flux amounts of the field magnets 1331 and 1332 can be made equal to each other. For example, as shown in FIG. 11, when both the inner and outer peripheries of the field magnets 1331 and 1332 are circular, the area π · (D1out ² −D1in ² ) of the first magnetic pole surface 1331a and the second The area π · (D2out ² −D2in ² ) of the magnetic pole surface 1332a is made equal. Here, reference symbols D1in and D2in indicate the inner diameters of the field magnets 1331 and 1332, respectively, and reference symbols D1out and D2out indicate the outer diameters of the field magnets 1331 and 1332, respectively.

  However, when the area of the first magnetic pole surface 1331a is equal to the area of the second magnetic pole surface 1332a, the length of the field magnet 1331 in the radial direction is greater than the length of the field magnet 1332 in the radial direction. Also grows. For this reason, the length in which the magnetic body plate 1313 extends between the 3rd core parts 1312 becomes long. In particular, when the thickness of the magnetic plate 1332 in the predetermined direction 91 is small, magnetic saturation is likely to occur in the magnetic plate 1313 and the magnetic resistance increases.

Therefore, the area of the second magnetic pole surface 1332a [pi · a (D2out ² -D2in ^2), by larger than the area of the first magnetic pole surface ^{1331a π · (D1out 2 -D1in 2} ), field radial magnet 1332 May be close to the length of the field magnet 1331 in the radial direction.

  The core 134 includes a single fifth core part 1341, a plurality of seventh core parts 1342, and a magnetic plate 1343. The core 135 includes a single sixth core part 1351, a plurality of eighth core parts 1352, and a magnetic plate 1353.

  The fifth core portion 1341 is provided on the third magnetic pole surface 1331b. The sixth core portion 1351 is provided on the fourth magnetic pole surface 1332b.

  From the viewpoint of preventing short-circuiting of the magnetic flux in the field element 13, the fifth core portion 1341 and the sixth core portion 1351 have a gap length similar to the first and second core portions 1311, 1321. It is desirable that they are provided at a distance of twice the distance. Here, the gap length is a distance between an armature 232 (described later) and the field element 13.

  Each of the seventh core parts 1342 is annularly arranged around the rotation shaft 92 along the circumferential direction 93, and both are magnetically coupled to the fifth core part 1341. For example, similar to the third core portion 1312, the rotation axis 92 is provided at 90 ° intervals. Each of the seventh core portions 1342 protrudes from the fifth core portion 1341 on the side opposite to the predetermined direction 91. In FIG. 10, the seventh core part 1342 is provided at a position opposite to the third core part 1312 with respect to the field magnet 1331 in the predetermined direction 91.

  Each of the eighth core portions 1352 is annularly disposed along the circumferential direction 93 around the rotation shaft 92, and both are magnetically coupled to the sixth core portion 1351. In FIG. 10, the eighth core portion 1352 is provided at 90 ° intervals around the rotation shaft 92. In addition, when viewed from the outer peripheral side, the eighth core portion 1352 and the seventh core portion 1342 are alternately arranged around the rotation shaft 92 at 45 ° intervals. Each of the eighth core portions 1352 protrudes from the sixth core portion 1351 on the side opposite to the predetermined direction 91.

  About the 7th and 8th core parts 1342 and 1352, the length about the circumferential direction 93 may become small as it goes to the predetermined direction 91 similarly to the 3rd and 4th core parts 1312 and 1322. If there are corners, they may be chamfered or rounded.

  The magnetic plate 1343 is provided on the seventh core portion 1342 from the side opposite to the predetermined direction 91 and extends between the eighth core portions 1352 adjacent to each other along the circumferential direction 93. If the magnetic plate 1343 and the seventh core portion 1342 are viewed as one seventh core portion, the magnetic plate 1343 is opposite to the fifth core portion 1341 of the seventh core portion. It can be grasped as an end. Then, it can be understood that the end portion extends between the eighth core portions 1352 adjacent to each other along the circumferential direction 93.

  The magnetic plate 1353 is provided on the eighth core portion 1352 from the side opposite to the predetermined direction 91 and extends between the seventh core portions 1342 adjacent to each other along the circumferential direction 93. If the magnetic plate 1353 and the eighth core portion 1352 are viewed as one eighth core portion, the magnetic plate 1353 is opposite to the sixth core portion 1351 of the eighth core portion. It can be grasped as an end. Then, it can be understood that the end portion extends between the seventh core portions 1342 adjacent to each other along the circumferential direction 93.

  Similar to the magnetic plates 1313 and 1323, from the viewpoint of preventing a short circuit of magnetic flux, the magnetic plate 1343, the magnetic plate 1353, and the eighth core portion 1352 are not in contact with each other, and the magnetic plate Desirably, 1323 and the seventh 1342 are not in contact with each other. As shown in FIG. 11, the outer peripheral sides and the inner peripheral sides of the magnetic plates 1342 and 1352 may be connected to each other.

  Further, from the viewpoint of reducing the cogging torque, the gaps between the magnetic plates 1343 and 1353 may be inclined with respect to the radial direction, and the surface that can face the armature 232 described later is convex. You may exhibit the shape of.

  In view of the fact that the magnetic plate 1343 extends between the eighth core portion 1352 and the magnetic plate 1353 extends between the seventh core portion 1342, the seventh and eighth core portions 1342, 1352, respectively. A central angle θ3 (not shown) centered on the rotation shaft 92 is desirably 45 ° or less.

  Since the surfaces of the magnetic plates 1343 and 1353 opposite to the predetermined direction 91 are magnetized to the S and N poles, respectively, the field element 13 has eight poles on the opposite side of the predetermined direction 91. Therefore, N poles and S poles are alternately arranged around the rotation axis 92 in the field element 13 viewed from the side opposite to the predetermined direction 91. As with the magnetic plates 1313 and 1323, it is desirable that the magnetic plates 1343 and 1353 have the same shape.

  The armature 231 is unevenly distributed in the circumferential direction 93 and selectively opposes the third core part 1312 and the fourth core part 1322. Specifically, the armature 231 faces the field element 13 from the predetermined direction 91 only in a part of the field element 13 viewed from the predetermined direction 91.

  The armature 231 includes a back yoke 2311, teeth 2312, and a winding 2313. In FIG. 9, the teeth 2312 are not shown. The back yoke 2311 is provided on the predetermined direction 91 side of the field element 13 and faces only a part of the field element 13 viewed from the predetermined direction 91. The teeth 2312 protrude from the back yoke 2311 to the field element 13, and the end surface opposite to the back yoke 2311 faces the field element 13. Winding 2313 is wound around teeth 2312. Although not shown in FIG. 9, six teeth 2312 are provided similarly to an armature 232 described later, and a winding 2313 is wound around each of the teeth 2312 by a concentrated winding method.

  The armature 232 is unevenly distributed in the circumferential direction 93 and selectively opposes the seventh core part 1342 and the eighth core part 1352. Specifically, the armature 232 faces the field element 13 from the side opposite to the predetermined direction 91 only on a part of the field element 13 viewed from the side opposite to the predetermined direction 91.

  The armature 232 includes a back yoke 2321, teeth 2322, and a winding 2323. The back yoke 2321 is provided on the side opposite to the predetermined direction 91 of the field element 13 and faces only a part of the field element 13 viewed from the side opposite to the predetermined direction 91. The teeth 2322 protrude from the back yoke 2321 to the field element 13, and the end surface opposite to the back yoke 2321 faces the field element 13. Winding 2323 is wound around teeth 2312. In FIG. 9, six teeth 2322 are provided, and a winding 2323 is wound around each of the teeth 2322 by a concentrated winding method.

  As shown in FIG. 9, the armature 231 and the armature 232 desirably face each other via the field element 13 in a predetermined direction 91. According to this aspect, the attractive force generated in the field element 13 is balanced, so that the bearing loss caused by the swing of the rotating shaft 92 can be reduced.

  Similar to the armature 21 described in the first embodiment, it is desirable that the cross-sectional area with respect to the protruding direction of the teeth 2312 is larger as it is closer to the field element 13. In particular, it is desirable that the inner diameter and outer diameter of the end face of the teeth 2312 on the field element 13 side are the same as the inner diameter and outer diameter of the magnetic plates 1313 and 1323 of the field element 13, respectively. According to this aspect, it is possible to reduce the magnetic resistance in the gap between the armature 231 and the field element 13. This is because the magnetic path of the magnetic flux flowing on the inner and outer peripheral sides of the gap is about the gap length.

  For the windings 231 and 232, for example, a three-phase winding is employed as in the armature 21 of the first embodiment. In FIG. 9, since the armatures 231 and 232 each have six windings 2313 and 2323, two sets of three-phase windings can be adopted for the windings 2313 and 2323, respectively.

  When the same number of three-phase windings are provided in each of the armatures 231 and 232, the phase order of the winding 2313 in the circumferential direction 93 and the phase order of the winding 2323 in the circumferential direction 93 are: It is desirable to be different. This is because the cogging torque and the torque ripple can be reduced, and the influence of both ends in the circumferential direction 93 of the electric elements 231 and 232 can be reduced. In this case, the position of the field element 13 as viewed from the predetermined direction 91 of each of the third and seventh core portions 1312 and 1342 is also determined based on the phase order of the winding 2313 and the phase order of the winding 2323. In other words, it is desirable to shift in accordance with the deviation of the electrical angle.

  For example, the winding 2313 is in the circumferential direction 93 in the order of U phase, V phase, W phase, U phase, V phase, W phase, and the winding 2323 is in the circumferential direction 93 in the order of V phase, W phase, U phase, V phase. Arranged in the order of phase, W phase, and U phase. In this case, when viewed from the predetermined direction 91, the rotating magnetic field generated by the winding 2313 and the rotating magnetic field generated by the winding 2323 have the same rotating direction. The winding 2323 is arranged in the circumferential direction 93 in the order of the U phase, W phase, V phase, U phase, W phase, and V phase, that is, the rotating direction of the rotating magnetic field is the winding 2313 and the winding 2323. If the opposite is true, do not use here.

  Even when the phase sequence is the same, one of the armatures 231 and 232 is provided so as to be shifted by a predetermined angle in the circumferential direction 93 with respect to the other, whereby cogging torque and torque ripple can be reduced. .

  Similarly to the armature 21 of the first embodiment, the cross-sectional area of the tooth 2312 closest to the end in the circumferential direction 93 of the armature 231 with respect to the protruding direction is relative to the protruding direction of the other teeth 2312. It is desirable that it be larger than the cross-sectional area. The same applies to the armature 232.

  According to the motor of this embodiment, the magnetic flux flowing into and out of the first magnetic pole surface 1331a can flow to any third core portion 1312 via the first core portion 1311. Any magnetic flux flowing into and out of the second magnetic pole surface 1332a can also flow into the fourth core portion 1322 via the second core portion 1321. Therefore, most of the magnetic flux of the field magnets 1331 and 1332 can be passed to the third and fourth core portions 1312 and 1322 at positions facing the armature 231. In other words, leakage of magnetic flux from the third and fourth core portions 1312 and 1322 at positions not facing the armature 231 can be reduced. In addition, even when the magnetization of the field magnets 1331 and 1332 is uneven, the influence is small. This increases the efficiency of the motor.

  Further, the magnetic flux flowing into and out of the third magnetic pole surface 1331b can flow to any seventh core portion 1342 via the fifth core portion 1341. Further, the magnetic flux flowing into and out of the fourth magnetic pole surface 1332b can flow to any of the eighth core portions 1352 via the sixth core portion 1351. Therefore, most of the magnetic flux of the field magnets 1331 and 1332 can be passed to the seventh and eighth core portions 1342 and 1352 at positions facing the armature 232. Accordingly, when driving the motor, not only the magnetic flux flowing into and out of the first magnetic pole surface 1331a and the second magnetic pole surface 1332a but also the magnetic flux flowing into and out of the third magnetic pole surface 1331b and the fourth magnetic pole surface 1332b can be used. This increases the efficiency and output of the motor.

  Furthermore, since the magnetic plate 1313 extends between the fourth core portions 1322 and the magnetic plate 1323 extends between the third core portions 1312, the magnetic flux flowing from the field element 13 can be efficiently transferred to the electric machine. The windings of the child 231 can be interlinked. In addition, since the magnetic plate 1343 extends between the eighth core portion 1352 and the magnetic plate 1353 extends between the seventh core portion 1342, the magnetic flux flowing from the field element 13 is efficiently transferred to the armature. 232 windings can be interlinked. Therefore, the efficiency of the motor is further increased.

  Moreover, since the armatures 231 and 232 are unevenly distributed in the circumferential direction 93, the motor can be reduced in size.

  In the present embodiment, the armature 231 and the armature 232 are opposed to each other via the field element 13 in the predetermined direction 91, so that the attractive forces generated in the field element 13 are balanced, and thus the rotation axis. This reduces the load on the bearing caused by runout. Therefore, the mechanical loss of the bearing can be reduced and the life of the bearing can be extended. In particular, when the armature 231 has teeth, such an effect appears remarkably.

  Most of the magnetic flux in the first and second core portions 1311, 1321 and the fifth and sixth core portions 1341, 1351 flows along the predetermined direction 91 or the circumferential direction 93. Therefore, it is desirable to employ wound cores for the first and second core portions 1311, 1321 and the fifth and sixth core portions 1341, 1351. However, a dust core or a laminate of electromagnetic steel sheets may be used.

  Most of the magnetic flux in the third and fourth core portions 1312 and 1322 and the seventh and eighth core portions 1342 and 1352 flows along the predetermined direction 91. Therefore, it is desirable to employ a structure in which electromagnetic steel plates are laminated in the circumferential direction 93 for the third and fourth core portions 1312, 1322 and the seventh and eighth core portions 1342, 1352.

  Also in this embodiment, similarly to the first embodiment, the field element 13 may be penetrated by the shaft 94 that can rotate around the rotation shaft 92. However, when the shaft 94 is made of a magnetic material, it is desirable to retract the inner circumference of the field element 13 from the shaft 94 to the outer circumference side. This is because the magnetic flux of the field magnet 1331 can be prevented from being short-circuited via the shaft 94. For example, a nonmagnetic material may be embedded between the inner periphery of the field element 13 and the shaft 94 by molding the field element 13. On the other hand, when the shaft 94 is made of a nonmagnetic material such as stainless steel, the field element 13 can be directly fitted to the shaft 94.

  FIG. 9 shows the case where the armatures 231 and 232 are provided on both sides of the field element 13 in the predetermined direction 91, but one armature 231 may be provided only on one side. .

  FIG. 12 illustrates a field element that can be employed in such an embodiment. The field element includes a magnetic body 136 in place of the cores 134 and 135 with respect to the field element 13.

  The magnetic body 136 is single and is provided on the third magnetic pole surface 1331b and the fourth magnetic pole surface 1332b. That is, the third magnetic pole surface 1331b and the fourth magnetic pole surface 1332b are magnetically coupled via the magnetic body 136.

  According to such a field element, in a motor in which the armature 231 is provided only on the side of the predetermined direction 91 with respect to the field element, a magnetic material is provided on the side opposite to the armature 231 with respect to the field magnets 1331 and 1332. Since 136 functions as a back yoke, the motor can be driven using the magnetic flux flowing into and out of the third magnetic pole surface 1331b and the fourth magnetic pole surface 1332b. Therefore, the efficiency and output of the motor are increased.

  In addition, since the third magnetic pole surface 1331b and the fourth magnetic pole surface 1332b are magnetically short-circuited by the magnetic body 136, the first magnetic pole face 1331a can be obtained even if the shaft made of the magnetic body is fitted to the magnetic body 136. And the third magnetic pole surface 1331a are unlikely to short-circuit the magnetic flux.

  In the present embodiment, the third and fourth core portions 1312, 1322 and the armature 232 at positions facing the armature 231 even when the magnetic plates 1313, 1323, 1343, 1353 are not provided. A large amount of magnetic flux can be passed through the seventh and eighth core portions 1342 and 1352 at the opposing positions. However, as described above, it is desirable to provide the magnetic plates 1313, 1323, 1343, and 1353 from the viewpoint of increasing the efficiency of the motor.

Third embodiment.
FIG. 13 conceptually shows the field element 14 of the motor according to the present embodiment. The field element 14 includes cores 141 and 142 and a field magnet 143, and is rotatable around a rotation shaft 92 along a predetermined direction 91. In addition, the said motor is obtained by employ | adopting the field element 14 instead of the field element 13 about the motor (FIG. 9) demonstrated in 2nd Embodiment. Since the armatures 231 and 232 (FIG. 9) are the same as those in the second embodiment, the description thereof is omitted in this embodiment.

  The field magnet 143 has an annular shape along the circumferential direction 93 and has a first magnetic pole surface 143a and a second magnetic pole surface 143b having different polarities. For example, the field element 143 has an N pole on the first magnetic phase 143a and an S pole on the second magnetic pole surface 143b.

  The first magnetic pole surface 143a and the second magnetic pole surface 143b are located on the inner peripheral side and the outer peripheral side of the field magnet 143, respectively. The polarity of the field magnet 143 is obtained, for example, by magnetization. Magnetization may be performed after the field element 14 is obtained using the field magnet 143. In this case, the space on the inner peripheral side and the outer peripheral side of the field element 14 or the predetermined direction 91 is determined. Magnetization is performed by inserting, for example, a magnetizing coil or a magnetizing yoke into the space at both ends. Moreover, since the first magnetic pole surface 143a and the second magnetic pole surface 143b are each a single pole, magnetization is easy.

  The core 141 includes a single first core part 1411, a plurality of third core parts 1412, a fifth core part 1414, and magnetic plates 1413 and 1415. The core 142 includes a single second core part 1421, a fourth core part 1422, a sixth core part 1424, and magnetic plates 1423 and 1425. In FIG. 13, the magnetic plates 1413 and 1415 are shown shifted in the predetermined direction 91 with respect to the field magnet 143, and the magnetic plates 1423 and 1425 are shown shifted in the opposite direction to the predetermined direction 91. Has been.

  The first core portion 1411 is provided on the first magnetic pole surface 143a. The second core portion 1421 is provided on the second magnetic pole surface 143b.

  Each of the third core portions 1412 is arranged in an annular shape around the rotation shaft 92 along the circumferential direction 93, and both are magnetically coupled to the first core portion 1411. In FIG. 13, the third core portions 1412 are provided at intervals of 90 ° around the rotation shaft 92. Each of the third core parts 1412 protrudes from the first core part 1411 in a predetermined direction 91.

  Each of the fourth core portions 1422 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the second core portion 1421. In FIG. 13, the fourth core portions 1422 are provided at 90 ° intervals around the rotation shaft 92. Further, the fourth core portion 1422 and the third core portion 1412 are alternately arranged around the rotation shaft 92 at 45 ° intervals when viewed from the predetermined direction 91. The fourth core portion 1422 protrudes from the second core portion 1421 in the same direction as the direction in which the third core portion 1412 protrudes from the first core portion 1411, that is, in a predetermined direction 91. .

  The magnetic plate 1413 is provided on the third core portion 1412 from the predetermined direction 91 side, and extends between the fourth core portions 1422 adjacent to each other along the circumferential direction 93. If the magnetic body plate 1413 and the third core portion 1412 are viewed as one third core portion, the magnetic body plate 1413 is opposite to the first core portion 1411 of the third core portion. It can be grasped as an end. Then, it can be understood that the end portion extends between the fourth core portions 1422 adjacent to each other along the circumferential direction 93.

  The magnetic plate 1423 is provided on the fourth core portion 1422 from the predetermined direction 91 side, and extends between the third core portions 1412 adjacent to each other along the circumferential direction 93. If the magnetic plate 1423 and the fourth core portion 1422 are viewed as one fourth core portion, the magnetic plate 1423 is opposite to the second core portion 1421 of the fourth core portion. It can be grasped as an end. It can be understood that the end portion extends between the third core portions 1412 adjacent to each other along the circumferential direction 93.

  Similar to the magnetic plates 1313 and 1323 described in the second embodiment, from the viewpoint of preventing a short circuit of magnetic flux, the magnetic plate 1413, the magnetic plate 1423, and the fourth core portion 1422 are not mutually connected. It is desirable that the magnetic plates 1423 and the third core portion 1412 are not in contact with each other. In addition, like the field element 13 shown in FIG. 11, the outer peripheral sides and the inner peripheral sides of the magnetic plates 1413 and 1423 may be connected to each other.

  Further, from the viewpoint of reducing the cogging torque, the magnetic plates 1413 and 1423 may have a gap between them that is inclined with respect to the radial direction, and a surface that can face the armature 231 has a convex shape. May be presented.

  In view of the fact that the magnetic plate 1413 extends between the fourth core portion 1422 and the magnetic plate 1423 extends between the third core portion 1412, the third and fourth core portions 1412 and 1422, respectively. The central angle θ4 centered on the rotation shaft 92 is desirably 45 ° or less.

  Since the surfaces of the magnetic plates 1413 and 1423 on the predetermined direction 91 side are respectively magnetized to the N and S poles, the field element 14 has eight poles on the predetermined direction 91 side. Therefore, N poles and S poles are alternately arranged around the rotation axis 92 in the field element 14 viewed from the predetermined direction 91. In FIG. 13, N poles and S poles are alternately arranged at 45 ° intervals. As with the magnetic plates 1313 and 1323 of the second embodiment, it is desirable that the magnetic plates 1413 and 1423 have the same shape.

  Each of the fifth core portions 1414 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the first core portion 1411. In FIG. 13, the fifth core portions 1414 are provided at intervals of 90 ° around the rotation shaft 92. Each of the fifth core portions 1414 protrudes from the first core portion 1411 to the side opposite to the predetermined direction 91.

  Each of the sixth core portions 1424 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the second core portion 1421. In FIG. 13, the sixth core portions 1424 are provided at 90 ° intervals around the rotation shaft 92. Further, when viewed from the outer peripheral side, the sixth core portions 1424 and the fifth core portions 1414 are alternately arranged at 45 ° intervals. The fourth core portion 1424 protrudes from the second core portion 1421 on the side opposite to the predetermined direction 91.

  The magnetic plate 1415 is provided on the fifth core portion 1414 from the side opposite to the predetermined direction 91 and extends between the sixth core portions 1424 adjacent to each other along the circumferential direction 93. If the magnetic plate 1415 and the fifth core portion 1414 are viewed as one fifth core portion, the magnetic plate 1415 is opposite to the first core portion 1411 of the fifth core portion. It can be grasped as an end. It can be understood that the end portion extends between the sixth core portions 1424 adjacent to each other along the circumferential direction 93.

  The magnetic plate 1425 is provided on the sixth core portion 1424 from the side opposite to the predetermined direction 91 and extends between the fifth core portions 1414 adjacent to each other along the circumferential direction 93. If the magnetic plate 1425 and the sixth core portion 1424 are viewed as one sixth core portion, the magnetic plate 1425 is on the opposite side of the sixth core portion from the second core portion 1421. It can be grasped as an end. Then, it can be understood that the end portion extends between the fifth core portions 1414 adjacent to each other along the circumferential direction 93.

  Similar to the magnetic plates 1313 and 1323 described in the second embodiment, from the viewpoint of preventing a short circuit of magnetic flux, the magnetic plate 1415, the magnetic plate 1425, and the sixth core portion 1424 are not mutually connected. It is desirable that the magnetic plates 1425 and the fifth core portion 1414 are not in contact with each other. In addition, like the field element 13 shown in FIG. 11, the outer peripheral sides and the inner peripheral sides of the magnetic plates 1415 and 1425 may be connected to each other.

  Further, from the viewpoint of reducing the cogging torque, the magnetic plates 1415 and 1425 may have an air gap between them that is inclined with respect to the radial direction, and a surface that can face the armature 232 has a convex shape. May be presented.

  In view of the fact that the magnetic plate 1415 extends between the fourth core portion 1424 and the magnetic plate 1425 extends between the third core portion 1414, the third and fourth core portions 1414 and 1424, respectively. A central angle θ5 (not shown) around the rotation axis 92 is desirably 45 ° or less.

  Since the surfaces of the magnetic plates 1415 and 1425 opposite to the predetermined direction 91 are respectively magnetized to the N and S poles, the field element 14 has eight poles on the opposite side of the predetermined direction 91. Therefore, N poles and S poles are alternately arranged around the rotation shaft 92 in the field element 14 viewed from the side opposite to the predetermined direction 91. As with the magnetic plates 1313 and 1323 of the second embodiment, it is desirable that the magnetic plates 1415 and 1425 have the same shape.

  According to the motor of the present embodiment, the magnetic flux flowing into and out of the first magnetic pole surface 143a can flow to any third core portion 1412 via the first core portion 1411. Further, any magnetic flux flowing into and out of the second magnetic pole surface 143 b can also flow into the fourth core portion 1422 via the second core portion 1421. As a result, most of the magnetic flux of the field magnet 143 can flow to the third and fourth core portions 1412 and 1422 at positions facing the armature 231. Moreover, even when the field magnet 143 has uneven magnetization, the influence is small. Therefore, the efficiency of the motor is increased.

  Further, the magnetic flux flowing into and out of the first magnetic pole surface 143a can also flow to the fifth core portion 1414 via the first core portion 1411. Further, the magnetic flux flowing into and out of the second magnetic pole surface 143b can also flow to the sixth core portion 1424 via the second core portion 1421. Therefore, most of the magnetic flux of the field magnet 143 can be passed to the fifth and sixth core portions 1414 and 1424 at positions facing the armature 232, thereby further increasing the efficiency and output of the motor.

  Furthermore, since the magnetic plate 1413 extends between the fourth core portions 1422 and the magnetic plate 1423 extends between the third core portions 1412, the magnetic flux flowing from the field element 14 is efficiently transferred to the electric machine. The windings of the child 231 can be interlinked. Further, since the magnetic plate 1415 extends between the sixth core portion 1424 and the magnetic plate 1425 extends between the fifth core portion 1414, the magnetic flux flowing from the field element 14 is efficiently transferred to the armature. 232 windings can be interlinked. Therefore, the efficiency of the motor is further increased.

  As shown in FIG. 13, it is desirable that the third core portions 1412 and the fifth core portions 1414 are alternately arranged along the circumferential direction 93 when viewed from the predetermined direction 91. This is because the magnetic resistance can be reduced as compared with the case where the third core portion 1412 and the fifth core portion 1414 are provided at the same position when viewed from the predetermined direction 91. In other words, at any position of the first magnetic pole surface 143a, one of the third and fifth core portions 1412 and 1414 is provided close to the first magnetic pole surface 143a, so that the first magnetic pole surface 143a and the third and fifth cores are provided. The magnetic path of the magnetic flux flowing between the parts 1412 and 1414 via the first core part 1411 is short, and the magnetic resistance is thereby reduced.

  Also in the present embodiment, one armature 231 may be provided only on one side of the field element 14 as in the third embodiment.

  FIG. 14 illustrates a field element that can be employed in such an embodiment. The field element is one in which the field element 14 does not have the fifth and sixth core portions 1414 and 1424.

  According to such a field element, in a motor in which the armature 231 is provided only in the predetermined direction 91 side with respect to the field element, there is no back yoke such as the magnetic body 136 provided in the third embodiment. However, much of the magnetic flux flowing into and out of the field magnet 143 can be guided to the armature 231.

  Also in this embodiment, similarly to the first embodiment, the field element 14 may be penetrated by the shaft 94 that can rotate around the rotation shaft 92. According to the field element 14, even if the shaft 94 is made of a magnetic material, the surfaces of the first, third, and fifth core portions 1411, 1412, and 1414 that are close to or in contact with the shaft 94 have the same polarity. Only appears. Therefore, the first magnetic pole surface 143a and the second magnetic pole surface 143b are magnetically coupled to each other through the shaft 94, for example, through a shaft 94, a bearing, and a housing that fixes the motor. The magnetic flux does not short-circuit between 143a and the second magnetic pole surface 143b.

  However, as described above, when the first magnetic pole surface 143a and the second magnetic pole surface 143b are magnetically coupled, it is desirable to retract the inner periphery of the field element 14 from the shaft 94 to the outer peripheral side. For example, a non-magnetic material may be embedded between the inner periphery of the field element 14 and the shaft 94 by molding the field element 14. On the other hand, when the shaft 94 is made of a nonmagnetic material such as stainless steel, the field element 14 can be directly fitted to the shaft 94.

Fourth embodiment.
FIG. 15 conceptually shows the field element 15 of the motor according to the present embodiment. The field element 15 includes cores 151 and 152 and a field magnet 153. In FIG. 15, the core 151 is shown shifted in the predetermined direction 91 with respect to the field magnet 153, and the core portion 152 is shown shifted in the opposite direction to the predetermined direction 91. The motor according to the present embodiment can be obtained by providing the armature 231 described in the second embodiment on the field element 15 from the predetermined direction 91 side.

  The field magnet 153 has an annular shape around the rotation axis 92 along the circumferential direction 93, and has a first magnetic pole surface 153 a and a second magnetic pole surface 153 b having different polarities at both ends in the predetermined direction 91. For example, the field magnet 153 has an N pole on the first magnetic pole surface 153a and an S pole on the second magnetic pole surface 153b. The polarity of the field magnet 153 is obtained by magnetization, for example. As in the first embodiment, even after the field element 15 is obtained using the field element 153, the field magnet 153 can be magnetized by, for example, an air-core coil. Further, since the first magnetic pole surface 153a and the second magnetic pole surface 153b are each a single pole, magnetization is easy.

  The core 151 has a single first core portion 1511, a plurality of third core portions 1512, and a magnetic plate 1513. The core unit 152 includes a single second core unit 1521, a plurality of fourth core units 1522, and a magnetic body plate 1523.

  The first core portion 1511 is provided on the first magnetic pole surface 153a. The second core portion 1521 is provided on the second magnetic pole surface 153b.

  Each of the third core portions 1512 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the first core portion 1511. In FIG. 15, the third core portions 1512 are provided at intervals of 90 ° around the rotation shaft 92. The third core portions 1512 protrude from the first core portion 1511 in a predetermined direction 91, respectively.

  Each of the fourth core portions 1522 is annularly arranged along the circumferential direction 93, and both are magnetically coupled to the first core portion 1521. In FIG. 15, the fourth core portions 1522 are provided at intervals of 90 ° around the rotation shaft 92, and are alternately arranged at intervals of 45 ° with the third core portions 1512. Each of the fourth core portions 1521 protrudes from the second core portion 1521 in a predetermined direction 91 on the inner peripheral side of the field magnet 153.

  The magnetic plate 1513 is provided on the third core portion 1512 from the predetermined direction 91 side, and extends between the fourth core portions 1522 adjacent to each other along the circumferential direction 93. If the magnetic plate 1513 and the third core portion 1512 are viewed as one third core portion 1512, the magnetic plate 1513 is opposite to the first core portion 1511 of the third core portion. Can be grasped with the end of the. Then, it can be understood that the end portion extends between the fourth core portions 1522 adjacent to each other along the circumferential direction 93.

  The magnetic plate 1523 is provided in the fourth core portion 1523 from the predetermined direction 91 and extends between the third core portions 1512 adjacent to each other along the circumferential direction 93. If the magnetic plate 1523 and the fourth core portion 1522 are viewed as one fourth core portion 1522, the magnetic plate 1523 is opposite to the second core portion 1522 of the fourth core portion. Can be grasped with the end of the. It can be understood that the end portion extends between the third core portions 1512 adjacent to each other along the circumferential direction 93.

  Similar to the magnetic plates 1313 and 1323 described in the second embodiment, from the viewpoint of preventing a short circuit of magnetic flux, the magnetic plate 1513, the magnetic plate 1523, and the fourth core portion 1522 are not mutually connected. It is desirable that the magnetic plates 1523 and the third core portion 1512 are not in contact with each other. In addition, like the field element 13 shown in FIG. 11, the outer peripheral sides and the inner peripheral sides of the magnetic plates 1513 and 1523 may be connected to each other.

  Further, from the viewpoint of reducing the cogging torque, the magnetic plates 1513 and 1523 may have an air gap between them that is inclined with respect to the radial direction, and a surface that can face the armature 231 has a convex shape. May be presented.

  In view of the fact that the magnetic plate 1513 extends between the fourth core portion 1522 and the magnetic plate 1523 extends between the third core portion 1512, the third and fourth core portions 1512 and 1522, respectively. The central angle θ6 centered on the rotation shaft 92 is desirably 45 ° or less.

  Since the surfaces of the magnetic plates 1513 and 1523 on the predetermined direction 91 side are respectively magnetized to the N and S poles, the field element 15 has eight poles on the predetermined direction 91 side. Therefore, in the field element 15 viewed from the predetermined direction 91, N poles and S poles are alternately arranged at 45 ° intervals around the rotation axis 92. As with the magnetic plates 1313 and 1323 of the second embodiment, it is desirable that the magnetic plates 1513 and 1523 have the same shape.

  According to the motor of the present embodiment, the magnetic flux flowing into and out of the first magnetic pole surface 153a can flow to any third core portion 1512 via the first core portion 1511. Any magnetic flux flowing into and out of the second magnetic pole surface 153 b can flow to the fourth core portion 1522 via the second core portion 1521. Thereby, most of the magnetic flux of the field magnet 153 can be passed to the third and fourth core portions 1512 and 1522 at positions facing the armature 231. Moreover, even when the field magnet 153 has uneven magnetization, the influence is small. Therefore, the efficiency of the motor is increased.

  In addition, since the magnetic plate 1513 extends between the fourth core portions 1522 and the magnetic plate 1523 extends between the third core portions 1512, the magnetic flux flowing from the field element 15 is efficiently transferred to the armature. 231 windings can be interlinked. Therefore, the efficiency of the motor is further increased.

  Also in this embodiment, similarly to the first embodiment, the field element 15 may be penetrated by the shaft 94 that can rotate around the rotation shaft 92. According to the field element 15, even when the shaft 94 is made of a magnetic material, only the same polarity appears on the surfaces of the second and fourth core portions 1521 and 1522 that are close to or in contact with the shaft 94. Therefore, the first magnetic pole surface 153a and the second magnetic pole surface 153b are, for example, magnetically coupled via a shaft 94, a bearing, and a housing that fixes a motor, and the first magnetic pole surface via the shaft 94. Magnetic flux does not short-circuit between 153a and the second magnetic pole surface 153b.

  However, as described above, when the first magnetic pole surface 153a and the second magnetic pole surface 153b are magnetically coupled, the inner periphery of the field element 15 is connected to the shaft 94 as in the third embodiment. It is desirable to move away from the outer periphery.

<Application>
As described in the first embodiment, the motor of any of the above-described embodiments can be mounted on an air conditioner such as an air conditioner indoor unit, or can be employed in a fan motor or the like.

  In the first embodiment, the field element 11 can be attached to the electric element 21 from the direction perpendicular to the rotation shaft 91. Therefore, after the electric element 21 is attached to an air conditioner or the like, these elements are further attached. After molding, the field element 11 can be attached. Therefore, manufacturing efficiency is high.

  The motors according to the second to fourth embodiments can be applied, for example, when the driven parts are directly driven by the field elements 13-15. For example, it can be employed in a wheel-in motor of an automobile. Further, a belt may be put on the field elements 13 to 15 to drive the driven part via the belt. At this time, it is desirable to arrange the driven part and the motor so that the tension by the belt and the suction force by the armature are balanced.

It is a perspective view which shows notionally the motor demonstrated in 1st Embodiment. 2 is a perspective view conceptually showing a field element 11. FIG. It is a top view which shows the armature 21 by which the coil | winding was wound by the distributed winding system. It is a top view which shows the armature 21 by which the coil | winding was wound by the toroidal winding system. It is sectional drawing shown notionally of a motor. 4 is a perspective view conceptually showing a field element 11 penetrated by a shaft 94. FIG. It is a perspective view which shows a field magnet notionally. It is a perspective view which shows notionally the motor which has the armatures 21 and 22 in a pair. It is a perspective view which shows notionally the motor demonstrated by 2nd Embodiment. 2 is a perspective view conceptually showing a field element 13. FIG. 2 is a perspective view conceptually showing a field element 13. FIG. It is a perspective view which shows notionally the field element 13 employ | adopted when providing an armature only in one side. It is a perspective view which shows notionally the field element 14 demonstrated by 3rd Embodiment. It is a perspective view which shows notionally the field element 14 employ | adopted when providing an armature only in one side. It is a perspective view which shows notionally the field element 15 demonstrated by 4th Embodiment.

Explanation of symbols

11, 13, 14, 15 Field element 21, 231, 232 Armature 91 Predetermined direction 92 Rotating shaft 93 Circumferential direction 94 Shaft 113, 1331, 1332, 143, 153 Field magnet 113a, 1331a, 143a, 153a First Magnetic pole surfaces 113b, 1332a, 143b, 153b Second magnetic pole surface 136 Magnetic body 1331b Third magnetic pole surface 1332b Fourth magnetic pole surface 1111, 1311, 1411, 1511 First core portion 1121, 1321, 1421, 1521 Second core portion 1112, 1312, 1412, 1512 3rd core part 1122,1322,1422,1522 4th core part 1112a, 1122a End part 1313,1323,1413,1423,1513,1523,1343,1353,1415,1425 Magnetic body Board 1341 1414 fifth core portion 1351,1424 sixth core portion 1342 7 core 1352 core unit 211,2311,2321 back yoke 212,2312,2322 teeth 213,2313,2323 winding eighth of

Claims (25)

A first magnetic pole surface (113a; 1331a; 143a; 153a) and a second magnetic pole surface (113b; 1332a; 143b) which are rotatable around a rotation axis (92) along a predetermined direction (91) and have different polarities. 153b) field magnets (113; 1331, 1332; 143; 153);
A single first core portion (1111; 1311; 1411; 1511) provided on the first magnetic pole surface;
A single second core portion (1121; 1321; 1421; 1521) provided on the second magnetic pole surface;
A third core portion (1112; 1312, 1313; 1412, 1413; 1512) that is annularly arranged along the circumferential direction (93) around the rotation axis and is magnetically coupled to the first core portion. , 1513),
A fourth core portion (1122; 1322, 1323) that is annularly arranged along the circumferential direction, is magnetically coupled to the second core portion, and projects in the same direction as the third core portion. 1422, 1423; 1522, 1523) and a plurality of field elements (11; 13; 14; 15);
And a (231 21; 231, 232; 231, 232), the unevenly distributed in the circumferential direction, the third core portion and the armature facing a part only of the fourth core portion
The armature (231; 232) faces the field element from the predetermined direction only in a part of the field element (13) viewed from the predetermined direction (91).
The second magnetic pole surface (1332a) is located on the outer peripheral side with respect to the first magnetic pole surface (1331a),
The first magnetic pole surface and the second magnetic pole surface are both positioned on the predetermined direction side with respect to the field magnets (1331, 1332),
The third core portions (1312, 1313) both protrude from the first core portion in the predetermined direction,
Each of the fourth core parts (1322, 1323) is a motor that protrudes from the second core part in the predetermined direction . The field magnets (1331, 1332)
A third magnetic pole surface (1331b) positioned opposite to the first magnetic pole surface (1331a) in the predetermined direction (91) with respect to the field magnet and having a polarity different from that of the first magnetic pole surface. When,
A fourth magnetic pole surface (1332b) positioned opposite to the second magnetic pole surface (1332a) in the predetermined direction with respect to the field magnet and having a polarity different from that of the second magnetic pole surface;
Further comprising
The field element (13) is
Single magnetic body (136) provided on the third magnetic pole surface and the fourth magnetic pole surface
The motor according to claim 1 , further comprising: The armatures make a pair (231,232),
One of the armatures (232) is provided to face the other armature (231) via the field element (13) from the side opposite to the predetermined direction (91),
The field magnets (1331, 1332)
A third magnetic pole surface (1331b) positioned opposite to the first magnetic pole surface (1331a) in the predetermined direction with respect to the field magnet and having a polarity different from that of the first magnetic pole surface;
A fourth magnetic pole surface (1332b) positioned opposite to the second magnetic pole surface (1332a) in the predetermined direction with respect to the field magnet and having a polarity different from that of the second magnetic pole surface;
Further comprising
The field element (13) is
Fifth and sixth core portions (1341, 1351) respectively provided on the third magnetic pole surface and the fourth magnetic pole surface;
A plurality of seventh core portions (1342, 1343), which are annularly arranged along the circumferential direction (93), and all protrude from the fifth core portion to the opposite side of the predetermined direction;
A plurality of eighth core portions (1352, 1353) which are annularly arranged along the circumferential direction and all protrude from the sixth core portion to the side opposite to the predetermined direction;
The motor according to claim 1, further comprising: The end portions (1343) opposite to the predetermined direction (91) of the seventh core portions (1342, 1343) are adjacent to each other along the circumferential direction (93). (1352, 1353) extending to the outer peripheral side of the field element (13),
An end portion (1353) opposite to the predetermined direction of each of the eighth core portions is between the seventh core portions adjacent to each other along the circumferential direction, on the rotating shaft (92) side. The motor of claim 3, extending to The end portion (1343) of the seventh core portion (1342, 1343) and the end portion (1353) of the eighth core portion (1352, 1353) are on the outer peripheral side and on the inner peripheral side. Each connected,
The motor according to claim 4, wherein a gap extending from the inner peripheral side to the outer peripheral side is provided between the end portion of the seventh core portion and the end portion of the eighth core portion . The motor according to any one of claims 1 to 5, wherein an area of the first magnetic pole surface (1331a) and an area of the second magnetic pole surface (1332a) are substantially the same . The motor according to any one of claims 1 to 5, wherein an area of the second magnetic pole surface (1332a) is larger than an area of the first magnetic pole surface (1331a) . A first magnetic pole surface (113a; 1331a; 143a; 153a) and a second magnetic pole surface (113b; 1332a; 143b) which are rotatable around a rotation axis (92) along a predetermined direction (91) and have different polarities. 153b) field magnets (113; 1331, 1332; 143; 153);
A single first core portion (1111; 1311; 1411; 1511) provided on the first magnetic pole surface;
A single second core portion (1121; 1321; 1421; 1521) provided on the second magnetic pole surface;
A third core portion (1112; 1312, 1313; 1412, 1413; 1512) that is annularly arranged along the circumferential direction (93) around the rotation axis and is magnetically coupled to the first core portion. , 1513),
A fourth core portion (1122; 1322, 1323) that is annularly arranged along the circumferential direction, is magnetically coupled to the second core portion, and projects in the same direction as the third core portion. 1422, 1423; 1522, 1523) and
A field element (11; 13; 14; 15) having:
An armature (21; 231, 232; 231, 232; 231) that is unevenly distributed in the circumferential direction and faces only a part of the third core portion and the fourth core portion;
With
The armature (231; 232) faces the field element from the predetermined direction only in a part of the field element viewed from the predetermined direction (91).
The field magnet (143) has an annular shape along the circumferential direction (93),
The first magnetic pole surface (143a) and the second magnetic pole surface (143b) are located on the inner peripheral side and the outer peripheral side of the field magnet, respectively.
The third core portions (1412, 1413) both protrude from the first core portion in the predetermined direction,
Each of the fourth core parts (1422, 1423) is a motor that protrudes from the second core part in the predetermined direction . The armatures make a pair (231,232),
One of the armatures (232) is provided to face the other (231) of the armature through the field element (13) from the side opposite to the predetermined direction (91),
The field element (14) is
A fifth core portion (1414, 1415) is arranged annularly along the circumferential direction (93), and both protrude from the first core portion (1411) to the opposite side to the predetermined direction (91). ) And
A plurality of sixth core portions (1424, 1425) that are annularly arranged along the circumferential direction and all protrude from the second core portion (1421) to the side opposite to the predetermined direction.
The motor according to claim 8, further comprising: The third core portions (1412, 1413) and the fifth core portions (1414, 1415) are alternately arranged along the circumferential direction (93) when viewed from the predetermined direction (91). The motor according to claim 9 . The ends (1415) of the fifth core portions (1414, 1415) opposite to the predetermined direction (91) are sixth core portions adjacent to each other along the circumferential direction (93). (1424, 1425) extending to the outer peripheral side of the field element (14),
An end portion (1425) opposite to the predetermined direction of each of the sixth core portions is between the fifth core portions adjacent to each other along the circumferential direction, on the rotating shaft (92) side. 11. A motor according to claim 9 or claim 10 extending to The end portion (1415) of the fifth core portion (1414, 1415) and the end portion (1425) of the sixth core portion (1424, 1425) are on the outer peripheral side and on the inner peripheral side. Each connected,
The motor according to claim 11, wherein a gap extending from the inner peripheral side to the outer peripheral side is provided between the end portion of the fifth core portion and the end portion of the sixth core portion . Each of the pair of armatures (231, 232) has the same number of three-phase windings,
The three-phase windings of the pair of armatures are arranged in the circumferential direction (93) in a certain phase sequence,
The other three-phase windings of the pair of the armatures are arranged in the circumferential direction in a phase sequence different from the phase sequence, any one of claims 3 to 5 and 9 to 12. The motor as described in one . The armature pairs (231, 232) both have the same number of three-phase windings and are arranged in the circumferential direction (93) in the same phase sequence;
One of the pair of armatures is offset from the other by a predetermined angle in the circumferential direction;
The motor according to any one of claims 3 to 5, and 9 to 12 . A first magnetic pole surface (113a; 1331a; 143a; 153a) and a second magnetic pole surface (113b; 1332a; 143b) which are rotatable around a rotation axis (92) along a predetermined direction (91) and have different polarities. 153b) field magnets (113; 1331, 1332; 143; 153);
A single first core portion (1111; 1311; 1411; 1511) provided on the first magnetic pole surface;
A single second core portion (1121; 1321; 1421; 1521) provided on the second magnetic pole surface;
A third core portion (1112; 1312, 1313; 1412, 1413; 1512) that is annularly arranged along the circumferential direction (93) around the rotation axis and is magnetically coupled to the first core portion. , 1513),
A fourth core portion (1122; 1322, 1323) that is annularly arranged along the circumferential direction, is magnetically coupled to the second core portion, and projects in the same direction as the third core portion. 1422, 1423; 1522, 1523) and
A field element (11; 13; 14; 15) having:
An armature (21; 231, 232; 231, 232; 231) that is unevenly distributed in the circumferential direction and faces only a part of the third core portion and the fourth core portion;
With
The armature (231) faces the field element from the predetermined direction (91) only in a part of the field element (15) viewed from the predetermined direction (91).
The field magnet (153) has an annular shape along the circumferential direction (93),
The first magnetic pole surface (153a) and the second magnetic pole surface (153b) are located on opposite sides of the predetermined direction with respect to the field magnet,
Each of the third core portions (1512, 1513) protrudes from the first core portion in the predetermined direction,
Each of the fourth core portions (1522, 1523) projects from the second core portion in the predetermined direction on the inner peripheral side of the field magnet . End portions (1313; 1413; 1513) on a predetermined direction (91) side of the third core portions (1312, 1313; 1412, 1413; 1512, 1513) and the fourth core portions (1322, 1323; 1422, 1423; 1522, 1523) on the end portion (1323; 1423; 1523) on the predetermined direction side, the outer peripheral side and the inner peripheral side are connected to each other,
A gap extending from the inner peripheral side to the outer peripheral side is provided between the end portion of the third core portion and the end portion of the fourth core portion.
Motor according to any one of claims 1 to 15. The armature (21; 231; 232) is
Back yoke (211; 2311; 2321);
Teeth (212; 2312; 2322) projecting from the back yoke to the field element (11; 13-15; 13, 14) side and having an end surface opposite to the back yoke facing the field element ,
Windings (213; 2313; 2323) wound around the teeth;
The motor according to claim 1, comprising: The cross-sectional area of the teeth (212; 2312; 2322) closest to the end in the circumferential direction (93) of the armature (21; 231; 232) is the direction in which the other teeth protrude. The motor of claim 17 , wherein the motor is larger than a cross-sectional area relative to . The motor according to claim 18 , wherein the distances between the teeth (212; 2312; 2322) adjacent to each other along the circumferential direction (93) are all equal . The cross-sectional area with respect to the protruding direction of the teeth (212; 2312; 2322) is larger as it is closer to the field element (11; 13-15; 13, 14). motor according to. The length of the end face in the direction perpendicular to the circumferential direction (93) is the third core part (1112; 1312, 1313; 1412, 1413; 1512, 1513) or the fourth core part (1122; 1322). , 1323; 1422, 1423; 1522, 1523), which is larger than the length in this direction . The motor according to any one of claims 1 to 21, wherein the armature (21; 231; 232) has at least one set of three-phase windings . The motor of claim 22, wherein the armature (21; 231; 232) comprises at least two sets of the three-phase windings . Each of the third core portions (1112; 1312, 1313; 1412, 1413; 1512, 1513) has an end portion (1112a; 1313) opposite to the first core portion (1111; 1311; 1411; 1511). 1413; 1513) extend between the fourth core portions (1122; 1322, 1323; 1422, 1423; 1522, 1523) adjacent to each other along the circumferential direction (93);
Ends (1122a; 1323; 1423; 1523) opposite to the second core parts (1121; 1321; 1421; 1521) of the fourth core parts are adjacent to each other along the circumferential direction. the extending to the third between the core portion, the motor according to any one of claims 1 to 23. The distance between the third core part (1112; 1312, 1313; 1412, 1413; 1512, 1513) and the fourth core part (1122; 1322, 1323; 1422, 1423; 1522, 1523) is The motor according to any one of claims 1 to 24 , wherein the motor is greater than twice the distance between a field element and the armature .

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