JP2010130819A - Field element and method for manufacturing field element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a field element capable of reducing difficulties in production. <P>SOLUTION: A plurality of first field magnets 40 and a plurality of second field magnets 41 are alternately arranged circularly around a rotating shaft P. The first field magnets 40 are magnetized in a diameter direction centered at the rotating shaft P. The second field magnets 41 are magnetized in a diameter direction in a circumferential direction centered at the rotating shaft P. The first field magnets 40 and the second field magnets 41 penetrate through a field element core 10 in an axial direction. The field element core 10 includes split field element cores 20 and 30. The first field magnets 40 are sandwiched by split field magnet cores 20, 30 to each other from the opposite side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a field element and a method for manufacturing the field element, and more particularly to a field element having field magnets arranged according to a Halbach array and a method for manufacturing the field element.

  The rotating electric machine includes a field element and an armature. By arranging the magnets of the field element according to the Halbach array, the leakage flux can be reduced and the linkage flux can be improved. In the Halbach array, each of the plurality of magnets arranged side by side in a predetermined direction rotates by 90 degrees in the predetermined direction.

  Patent Documents 1 to 3 describe techniques related to the present invention.

JP 2007-104819 A Japanese Patent Laid-Open No. 10-295061 Japanese Patent Application Laid-Open No. 2000-152569

  However, when the magnets are arranged according to the Halbach arrangement, an attractive force or a repulsive force acts between these magnets, making the arrangement difficult.

  Therefore, an object of the present invention is to provide a field element and a method for manufacturing the field element that can reduce manufacturing difficulties.

  A first aspect of the field element according to the present invention is arranged in a ring around a predetermined axis (P), presents a magnetic pole surface in a radial direction around the axis, and is circumferential in the center about the axis. Are arranged between two of the first field magnets adjacent to each other in the circumferential direction, and the circumferential direction of the first field magnets is different from each other. A second field magnet (41) having a magnetic pole surface, and a field element core (10) into which the first field magnet and the second field magnet are inserted along an axial direction along the axis. The field element core includes a first divided field element core (20) and a second divided field element core (30), and at least one of the first divided field element cores. And the second divided field element core are the first field magnet (40) opposite to each other in a radial direction about the axis? Sandwiching the pole faces of the second field magnet facing each other in the circumferential direction is the same polarity.

  A second aspect of the field element according to the present invention is the field element according to the first aspect, wherein the second field magnet (41) has the first divided field element core ( 20) and at least a part of the second divided field element core (30).

  A third aspect of the field element according to the present invention is the field element according to the first or second aspect, wherein the first split field element core (20) is the second field magnet (41). 411, 412) and a pair of surfaces (24, 34; 242, 342) opposed to each other in the radial direction.

  A field element according to a fourth aspect of the present invention is a field element according to any one of the first to third aspects, wherein the first divided field element core (20) is the first field field. It has a pair of surface (22, 32) which opposes mutually in a radial direction via a magnet (40).

  A fifth aspect of the field element according to the present invention is the field element according to the fourth aspect, wherein the first divided field element core (20) is the second divided field element core (30). On the side, a thin portion covering the first field magnet (40) is provided, and the thin portion exhibits one (32, 34) of the pair of surfaces.

  A sixth aspect of the field element according to the present invention is the field element according to the first or second aspect, wherein the first split field element core (20) has a plurality of first surfaces (241). 242), the second split field core (20) has a plurality of second surfaces (341, 342), and the first and second surfaces are a plurality of the second field magnets. The first split field element cores are opposed to each other in the radial direction via each of the magnets (41), and the first split field element core is in the radial direction from each of the first surfaces to the second split field element core. A plurality of first projecting portions (26) projecting from the second surface of each of the second surfaces toward the first segmented field core. And a plurality of second protrusions (36) that contact each of the first protrusions at the contact surface in the radial direction. Inclined on the same side of the serial peripheral direction, the first split field element core and the second split field element core is spaced apart from each other in the radial direction except for the contact surface.

  A seventh aspect of the field element according to the present invention is the field element according to the sixth aspect, wherein each of the second field magnets (41) sandwiches the second field magnet. Between the field magnets (40), there are two third field magnets (411) and a fourth field magnet (412) that are adjacent to each other around the axis, and the first protrusion and the second field magnet (412). The protrusion abuts between the third and fourth field magnets.

  An eighth aspect of the field element according to the present invention is the field element according to any one of the first to seventh aspects, wherein the first divided field element core (20) and the second divided part are provided. The field element core (30) has a plurality of laminated steel sheets laminated in the axial direction, the first rolling direction of the laminated steel sheets of the first divided field element core, and the second divided field element. It is mutually inclined with respect to the 2nd rolling direction of the said laminated steel plate which a core has.

  A ninth aspect of the field element according to the present invention is the field element according to the eighth aspect, wherein the first rolling direction and the second rolling direction are orthogonal to each other.

  A first aspect of the method of manufacturing a field element according to the present invention includes a plurality of first field magnets (40) and a plurality of second field magnets (alternatively arranged around a predetermined axis (P). 41) and a field element core (10) into which the first field magnet and the second field magnet are inserted along an axial direction along the axis, and the field element core is divided into first parts. A field element core (20) and a second divided field element core (30) are provided, and the first divided field element core and the second divided field element core are arranged in a radial direction about the axis. A manufacturing method for manufacturing a field element that sandwiches the first field magnet (40) from opposite sides of the hard magnetic first magnetic body (400) that becomes the first field magnet after magnetization. With respect to the first divided field core to which a plurality and a plurality of hard magnetic second magnetic bodies (410) to be the second field magnets after being magnetized are fixed, The second split field element core (30) is opposed to the first split field element core in a radial direction centered on the axis, and is opposite to the first magnetic body and the second magnetic body. From the radial direction centering on the axis, a plurality of magnetizing magnetic pole faces (60a) are respectively opposed to the first magnetic bodies to generate a magnetizing magnetic field from the magnetizing magnetic pole face, A first step of magnetizing the first magnetic body to form the first field magnet; and (b) removing a plurality of the magnetic pole surfaces for magnetization with the second split field element core removed. The magnetizing magnetic field is generated with the same polarity as the first step from the magnetizing magnetic pole face so as to face each of the first magnetic bodies, and the second magnetic body is magnetized to generate the second field magnet. A second step of forming a magnet is performed.

  A second aspect of the field element manufacturing method according to the present invention is the field element manufacturing method according to the first aspect, wherein the second step is executed before the execution of the first step.

  A third aspect of the method for manufacturing a field element according to the present invention is a method for manufacturing a field element according to the first or second aspect, wherein the second field magnet (41) is arranged in the radial direction. It is sandwiched between at least a part of the first divided field element core (20) and the second divided field element core (30).

  A field element manufacturing method according to a fourth aspect of the present invention is a field element manufacturing method according to any one of the first to third aspects, in which the first split field element core (20 ) Has a pair of surfaces (24, 34; 242, 342) facing each other in the radial direction via the second field magnets (41; 411, 412).

  A fifth aspect of the field element manufacturing method according to the present invention is a field element manufacturing method according to any one of the first to fourth aspects, wherein the first split field element core (20 ) Has a pair of surfaces (22, 32) opposed to each other in the radial direction via the first field magnet (40).

  According to a sixth aspect of the field element manufacturing method of the present invention, there is provided the field element manufacturing method according to the fifth aspect, wherein the first split field element core (40) is the first split field. The magnetic core (41) side includes a thin portion that covers the first field magnet (41), and the thin portions are opposed to each other in the radial direction via the first field magnet (40). Surfaces (22, 32) are formed.

  A seventh aspect of the method for manufacturing a field element according to the present invention is the method for manufacturing a field element according to the first or second aspect, wherein the first divided field element core (20) includes a plurality of field elements. The second split field core (20) has a plurality of second surfaces (341, 342), and the first and second surfaces are a plurality of first surfaces (241, 242). Of each of the second field magnets (41) of each of the first field magnet cores are opposed to each other in the radial direction, and the first split field element cores extend from each of the first surfaces to the second split field magnet cores. A plurality of first protrusions (26) projecting in the radial direction toward the first surface, and the second divided field element core is directed from each of the second surfaces to the first divided field element core. And a plurality of second protrusions (36) protruding in the radial direction, and in the field element, each of the first protrusions and each of the second protrusions Are in contact with each other in the radial direction at the contact surface, and the first divided field element core and the second divided field element core are separated from each other in the radial direction except for the contact surface. The length of the first surface in the direction is wider than the width of the second protrusion in the circumferential direction, and the length of the second surface in the circumferential direction is larger than the width of the first protrusion in the circumferential direction. Widely, in a predetermined steel plate, the first split field core and the second split field viewed from the axial direction in a positional relationship in which the first protrusion and the second protrusion are shifted in the circumferential direction. The shape of the child core is punched to form laminated steel sheets for the first divided field element core and the second divided field element core, and the laminated steel sheets are laminated in the axial direction.

  An eighth aspect of the method for manufacturing a field element according to the present invention is the method for manufacturing a field element according to the seventh aspect, wherein a plurality of the contact surfaces are in the same direction with respect to the circumferential direction. It is inclined to.

  According to a ninth aspect of the field element manufacturing method of the present invention, there is provided the field element manufacturing method according to the seventh or eighth aspect, wherein each of the second field magnets (41) is the second field magnet (41). Between the first field magnet (40) sandwiching the two field magnets, there are two third field magnets (411) and a fourth field magnet (412) adjacent to each other around the axis, In the field element, the first protrusion (26) and the second protrusion (36) abut between the third and fourth field magnets.

  According to the 1st aspect of the field element concerning this invention, the 1st aspect of the field element concerning this invention has a field magnet which exhibits what is called a Halbach arrangement. The first magnetic body, which is the first field magnet before magnetization, is provided with the second divided field element core provided, and the second field before magnetization is provided without the second divided field element core. It can contribute to the manufacturing method which magnetizes the 2nd magnetic body which is a magnet magnet, and forms a 1st field magnet and a 2nd field magnet.

  According to the second aspect of the field element according to the present invention, when the second magnetic body, which is the second field magnet before magnetization, is magnetized without providing the second divided field element core, On the side opposite to the first divided field element core with respect to the magnetic material, a nonmagnetic material having a large magnetic resistance, such as air, extends in the radial direction. Since the second magnetic body is sandwiched between the first magnetic bodies in the circumferential direction, the magnetic flux from the magnetizing magnetic pole surface through the first divided field core passes through the first magnetic body in the radial direction. It is easier to pass through the second magnetic body in the circumferential direction. Therefore, it is easy to magnetize the second magnetic body.

  According to the third aspect of the field element of the present invention, when the first magnetic body and the second magnetic body that are the first field magnet and the second field magnet before magnetization are magnetized, the first division is performed. The field element core can fix the second magnetic body in the radial direction. Therefore, there is no need to separately prepare a member for fixing the second magnetic body.

  According to the 4th aspect of the field element concerning this invention, when magnetizing the 1st magnetic body and the 2nd magnetic body which are the 1st field magnet and the 2nd field magnet before magnetization, the 1st division The field element core can fix the first magnetic body in the radial direction. Therefore, there is no need to separately prepare a member for fixing the first magnetic body.

  According to the fifth aspect of the field element of the present invention, since the magnetic flux does not easily pass through the thin wall portion, the attachment through the first divided field element core in the state where the second divided field element core is removed. The magnetic flux from the magnetic pole face is less likely to pass through the first magnetic body that is the first field magnet before magnetization, and more likely to pass through the second magnetic body that is the second field magnet before magnetization.

  According to the sixth aspect of the field element of the present invention, when the first divided field element core and the second divided field element core are assembled by bringing the first protrusion and the second protrusion into contact with each other. In addition, since the first projecting portion and the second projecting portion can be brought into contact with each other by rotating the second segmented field core core in the circumferential direction with respect to the first segmented field core, it is easily assembled. be able to.

  According to the seventh aspect of the field element of the present invention, the q-axis inductance can be improved even in the Halbach array by the portion composed of the first protrusion and the second protrusion.

  According to the eighth aspect of the field element of the present invention, the magnetic properties of the field element core depend on its rolling direction. Since the rolling directions of the first divided field element core and the second divided field element core sandwiching the first field magnet in the radial direction are inclined with respect to each other, the first divided field in each of the plurality of first field magnets The absolute value of the angle with respect to the line connecting the first field magnet magnetic pole center and the rotation center in the rolling direction of the magnetic core, and the first field magnet magnetic pole center and the rotation center in the rolling direction of the second divided field core. About the angle which averaged the absolute value of the angle with respect to a line, the angle of the direction with respect to a corresponding 1st field magnet approaches mutually. Therefore, it is possible to reduce variations in the operating point magnetic flux density of the plurality of first field magnets.

  According to the ninth aspect of the field element of the present invention, the line connecting the first field magnet magnetic pole center and the rotation center in the rolling direction of the first divided field element core in each of the plurality of first field magnets. The first field magnet corresponding to the angle obtained by averaging the absolute value of the angle with respect to the angle and the absolute value of the angle with respect to the line connecting the first field magnet magnetic pole center and the rotation center in the rolling direction of the second divided field element core The angle in that direction with respect to is 45 ° at all poles.

  According to the first aspect of the field element manufacturing method of the present invention, since the second split field element core is provided in the first step, the magnetic flux flows out from one magnetizing magnetic pole surface. Easily passes through the first magnetic body in the radial direction. Therefore, it is easy to form the first field magnet by magnetizing the first magnetic body in the radial direction.

  In the second step, since the second split field element core is not provided, the width in the radial direction of the core located on the side opposite to the magnetizing magnetic pole surface with respect to the first field magnet is short. Therefore, the magnetic flux flowing out from one magnetizing magnetic pole surface is less likely to penetrate the first magnetic body as compared with the case where the second divided field element core is provided. In other words, it is relatively easy to pass through the second magnetic body in the circumferential direction. Therefore, it is easy to form the second field magnet by magnetizing the second magnetic body in the radial direction.

  Therefore, a field element in which the first field magnet and the second field magnet constitute a so-called Halbach array can be manufactured. Further, when the first field magnet and the second field magnet after magnetization are alternately arranged around the axis, it is possible to eliminate the manufacturing inconvenience that they are attracted or repelled to make the arrangement difficult.

  According to the 2nd aspect of the manufacturing method of the field element concerning this invention, after magnetizing the 1st magnetic body and the 2nd magnetic body in the 1st process and the 2nd process, the 2nd division field element core is used. There is no need to remove it. Therefore, by performing the first and second steps, the field element can be assembled while magnetizing the first magnetic body and the second magnetic body.

  According to the third aspect of the field element manufacturing method of the present invention, when magnetizing the second magnetic body, which is the second field magnet before magnetization, Since the second divided field element core is removed, the second surface side of the first magnetic body that is the first field magnet before magnetization is covered with a nonmagnetic material having a large magnetic resistance such as air. Therefore, the magnetic flux from the magnetizing magnetic pole surface is less likely to pass through the first magnetic body in the radial direction, and more easily passes through the second magnetic body. Therefore, it is easy to magnetize the second magnetic body.

  According to the fourth aspect of the method for manufacturing a field element according to the present invention, when magnetizing the first magnetic body and the second magnetic body that are the first field magnet and the second field magnet before magnetization, The first divided field element core can fix the second magnetic body in the radial direction. Therefore, there is no need to separately prepare a member for fixing the second magnetic body.

  According to the fifth aspect of the method of manufacturing a field element according to the present invention, when magnetizing the first magnetic body and the second magnetic body that are the first field magnet and the second field magnet before magnetization, The first divided field element core can fix the first magnetic body in the radial direction. Therefore, there is no need to separately prepare a member for fixing the first magnetic body.

  According to the sixth aspect of the method for manufacturing a field element according to the present invention, since the magnetic flux hardly passes through the thin portion, the magnetic flux from the magnetizing magnetic pole surface with the second split field element core removed is The first magnetic body that is the first field magnet before magnetization is more difficult to pass, and the second magnetic body that is the second field magnet before magnetization is easier to pass.

  According to the seventh aspect of the field element manufacturing method of the present invention, since the first protrusion and the second protrusion are displaced in the circumferential direction, the first protrusion is punched once with respect to a predetermined steel plate. Laminated steel sheets for the first divided field element core and the second divided field element core can be formed.

  According to the 8th aspect of the manufacturing method of the field element concerning this invention, a 1st division | segmentation field element core and a 2nd division field element core are made to contact | abut a 1st protrusion and a 2nd protrusion. When assembling, by rotating the second divided field element core in the circumferential direction with respect to the first divided field element core, the first protrusion and the second protrusion can be brought into contact with each other, Can be easily assembled.

  According to the ninth aspect of the method of manufacturing a field element according to the present invention, the q-axis inductance can be improved even in the Halbach array by the portion including the first protrusion and the second protrusion.

First embodiment.
<Configuration of field element>
FIG. 1 shows an example of a conceptual configuration of a field element. FIG. 1 shows a cross section perpendicular to the rotation axis P. The same cross section is also shown in other drawings described below.

  The field element 1 is employed as a field element in a radial gap type rotating electrical machine. The field element 1 includes a plurality of first field magnets 40, a plurality of second field magnets 41, and a field element core 10.

  The first field magnet 40 is a rare earth magnet mainly composed of neodymium, iron, or boron, for example, and is arranged in a ring around the rotation axis P. In FIG. 1, four first field magnets 40 (so-called four poles) are shown, but there may be six or more. The first field magnet 40 has, for example, a plate shape, and is arranged so that the thickness direction thereof is along the radial direction of the first field magnet 40. More precisely, in the shape illustrated in FIG. 1, the thickness direction of the first field magnet 40 is the position of the center of the first field magnet 40 in the cross section perpendicular to the rotation axis P (hereinafter also referred to as the magnetic pole center). ) In the radial direction. The first field magnet 40 is magnetized in the radial direction (hereinafter, when referring to the radial direction of the component, the radial direction at the position where the component is arranged is simply referred to as the radial direction). Here, the first field magnet 40 is magnetized in the thickness direction. The magnetic pole surfaces that the first field magnets 40 adjacent to each other in the circumferential direction around the axis (hereinafter simply referred to as the circumferential direction) present in one radial direction are different from each other in the circumferential direction. The anisotropy of the first field magnet 40 preferably exhibits a parallel anisotropy that is parallel to the direction of the line connecting the magnetic pole center and the rotation center. This is because the magnetic flux density is high and the magnetization direction is easily stabilized.

  The second field magnet 41 is a rare earth magnet mainly composed of neodymium, iron, or boron, for example, and is arranged in a ring around the rotation axis P. Each of the second field magnets 41 is disposed between two of the first field magnets 40 adjacent in the circumferential direction. The second field magnet 41 has, for example, a rectangular parallelepiped shape, and is arranged such that the longitudinal direction of the second field magnet 41 is along the radial direction at the position where the second field magnet 41 is arranged. The second field magnet 41 is magnetized in the circumferential direction. Here, the second field magnet 41 is magnetized in the thickness direction perpendicular to the longitudinal direction. The second field magnet 41 is adjacent to itself in the circumferential direction, and the first field magnet presenting an N pole on the side where an armature (not shown) is arranged (in FIG. 1, the side opposite to the rotation axis P in the radial direction). Magnetized toward the magnet 40. In other words, the first field magnet 41 adjacent to the first field magnet 40 in the circumferential direction with respect to the magnetic pole surface that the first field magnet 40 presents to the armature is the first field magnet 40. It exhibits the same polar surface toward The anisotropy of the second field magnet 41 desirably exhibits parallel anisotropy orthogonal to the direction of the line connecting the magnetic pole boundary (the center between the magnetic poles adjacent in the circumferential direction) and the rotation center. This is because the magnetic flux density is high and the magnetization direction is easily stabilized.

  Such an arrangement of the first field magnet 40 and the second field magnet 41 is based on a so-called Halbach arrangement. Accordingly, when the armature is disposed opposite to the field element 1 from the opposite side to the rotation axis P, leakage of magnetic flux between the poles is reduced, and the field element 1 is effectively supplied to the armature. Magnetic flux can be increased.

  The field element core 10 has, for example, a cylindrical shape extending in the axial direction along the rotation axis P (hereinafter simply referred to as the axial direction). The field element core 10 is made of a soft magnetic material (for example, iron) having a high magnetic permeability. Further, it is desirable that the conductivity of the field element core 10 is lower than the conductivity of the first field magnet 40 and the second field magnet 41, for example, a dust core or a laminated steel sheet laminated in the axial direction (hereinafter referred to as electromagnetic). (Also called a steel plate). Thereby, generation | occurrence | production of an eddy current can be suppressed. Further, when the field element core 10 is made of an electromagnetic steel plate, it is preferable to fix these with a rivet penetrating in the axial direction.

  A first field magnet 40 and a second field magnet 41 are inserted through the field element core 10 along the axial direction. In other words, the field element core 10 includes a first insertion hole 12 through which the first field magnet 40 is inserted, and a second insertion hole 14 through which the second field magnet 41 is inserted. In FIG. 1, the first field magnet 40 and the second field magnet 41 are expressed so small that they do not contact the first through hole 12 and the second through hole 14, respectively. Actually, the surfaces 22 and 32 are in contact with the first field magnet 40, and / or the surfaces 24 and 34 are in contact with the second field magnet 41. In addition, the actual positions of both ends of the first field magnet 40 and the second field magnet 41 in the circumferential direction are indicated by broken lines.

  The field element core 10 has divided field element cores 20 and 30. At least a part of the divided field element core 20 and the divided field element core 30 sandwich the first field magnet 40 from the opposite side in the radial direction.

  Hereinafter, the field element core 10 will be described more specifically with reference to FIG. The first insertion hole 12 has a pair of surfaces 22 and 32 that are opposed to each other via the first field magnet 40 in the radial direction. The second through hole 14 has a pair of surfaces 24 and 34 that face each other with the second field magnet 41 in the radial direction. In other words, the surfaces 22 and 32 sandwich the first field magnet 40 and the surfaces 24 and 34 sandwich the second field magnet 41 in the radial direction.

  The divided field element cores 20 and 30 have a shape obtained by dividing the field element core 10 in the radial direction. The divided field element core 20 is located on the side opposite to the rotation axis P with respect to the divided field element core 30. The split field element core 20 includes surfaces 22 and 24, and the split field element core 30 includes surfaces 32 and 34. According to this aspect, the first field magnet 40 and the second field magnet 41 are sandwiched between the split field element cores 20 and 30 in the radial direction, respectively.

  According to such a field element 1, the first field magnet 40 is formed by magnetizing the hard magnetic body with the divided field element core 30 provided, and the divided field element core 30 is not provided. Thus, the second magnetic field magnet 41 can be formed by magnetizing the hard magnetic material. Hereinafter, the hard magnetic body that is magnetized and becomes the first field magnet 40 is referred to as a first magnetic body, and the hard magnetic body that is magnetized and becomes the second field magnet 41 is referred to as a second magnetic body.

<Method for manufacturing field element>
Hereinafter, a method for manufacturing the field element 1 will be described. FIG. 2 is a flowchart showing an example of a method for manufacturing a field element. The flowchart shown in FIG. 2 shows an example in which the first magnetic body is magnetized to form the first field magnet 40 and then the second magnetic body is magnetized to form the second field magnet 41. .

  First, in step S1, the first magnetic body and the second magnetic body are disposed at positions where the first field magnet 40 and the second field magnet 41 are disposed, respectively, and are inserted into the field element core 10. Let them fix each other. Since both the first magnetic body and the second magnetic body are not magnetized, no attractive force or repulsive force acts between them. Therefore, the first magnetic body and the second magnetic body can be easily arranged and fixed.

  Next, in step S2, with the split field element cores 20 and 30 provided, the first magnetic body is magnetized to form the first field magnet 40. FIG. 3 shows a state where the first magnetic body 400 is magnetized to form the first field magnet 40. In FIG. 3, a part of the field element 1 in the circumferential direction viewed from the rotation axis P is shown. In the figure, arrows indicate the flow of the magnetic field for magnetization φ1.

  As shown in FIG. 3, a plurality of magnetizing magnetic pole surfaces 60 a are respectively arranged in the radial direction from the side opposite to the first magnetic body 400 with respect to the split field element core 20. The magnetizing magnetic field φ1 is generated from the magnetizing magnetic pole surface 60a so as to be opposed to each other and have different polarities with respect to the first magnetic bodies 400 adjacent to each other in the circumferential direction. This will be specifically described below.

  The magnetizer includes a plurality of teeth 60. The plurality of teeth 60 are annularly arranged around the rotation axis P. Here, it is assumed that four teeth 60 are provided corresponding to the number of first magnetic bodies 400. One ends of the plurality of teeth 60 are magnetically coupled to each other by a back yoke (not shown) on the side opposite to the rotation axis P. In addition, a plurality of coils (not shown) are wound around the plurality of teeth 60 about the direction along the radial direction as an axis.

  The other end of the tooth 60 presents a magnetizing magnetic pole surface 60 a toward the divided field element core 20. That is, when a current flows through the coil, a magnetizing magnetic flux is generated from the magnetizing magnetic pole surface 60a. At this time, the current is passed through the coils so that the directions of the currents flowing through the coils adjacent in the circumferential direction are opposite to each other. Accordingly, the polarities of the magnetizing magnetic pole surfaces 60a adjacent in the circumferential direction are different from each other. Therefore, the magnetic flux flowing out from one magnetizing magnetic pole surface 60a flows to the magnetizing magnetic pole surface 60a located on both sides of the one magnetizing magnetic pole surface 60a. The direction of the magnetic flux is in the radial direction immediately after flowing out from one magnetizing magnetic pole surface 60a, and between the one magnetizing magnetic pole surface 60a and the magnetizing magnetic pole surface 60a adjacent to this one in the circumferential direction. Along the circumferential direction at the center and along the axial direction immediately before flowing into the magnetization magnetic pole surface 60a adjacent to the one magnetization magnetic pole surface 60a in the circumferential direction. The direction of the magnetic flux immediately after flowing out from one magnetizing magnetic pole surface 60a is the opposite direction to that immediately before flowing into the magnetizing magnetic pole surface 60a adjacent in the circumferential direction.

  The magnetizing magnetic pole surface 60a faces the first magnetic body 400 in the radial direction, and the divided field element core 30 is disposed on the opposite side of the magnetizing magnetic pole surface 60a with respect to the first magnetic body 400. According to this positional relationship, the magnetic flux flowing out from one magnetizing magnetic pole surface 60a is circumferentially separated from the one magnetizing magnetic pole surface 60a via the split field element core 30 having a low magnetic resistance (reluctance). It tends to flow into the adjacent magnetizing magnetic pole surface 60a. The magnetic flux flowing out from one magnetizing magnetic pole surface 60a flows into the divided field element core 30 through the one first magnetic body 400 facing the one magnetizing magnetic pole surface 60a along the radial direction. Cheap. The magnetic flux flows in the circumferential direction in the split field element core 30, passes through the first magnetic body 400 adjacent to the one first magnetic body 400 along the radial direction, and the one magnetic pole surface 60a for magnetization. It flows into the adjacent magnetizing magnetic pole surface 60a.

  When the magnetic flux flows through the path, the first magnetic body 400 is magnetized in the radial direction to form the first field magnet 40. Since magnetic fluxes in opposite directions flow through the first magnetic bodies 400 adjacent in the circumferential direction, they are magnetized in opposite directions. Further, since the magnetizing magnetic pole surface 60a is disposed so as to face all of the plurality of first magnetic bodies 400, the plurality of first magnetic bodies 400 can be magnetized simultaneously in one process.

  The magnetic resistance in the first path from one magnetizing magnetic pole surface 60a to the magnetizing magnetic pole surface 60a adjacent to the one magnetizing magnetic pole surface 60a via the first magnetic body 400 is one. It is desirable that the magnetic resistance be lower than that in the second path from the magnetizing magnetic pole surface 60a through the second magnetic body 410 to the magnetizing magnetic pole surface 60a adjacent to the one magnetizing magnetic pole surface 60a. Accordingly, more magnetic flux passes through the first path, so that more magnetic flux passes through the first magnetic body 400. Here, the second magnetic body may be slightly magnetized.

  This can be achieved, for example, by adopting a structure in which the width of the second magnetic body 410 in the circumferential direction is wider than the width of the first magnetic body 400 in the radial direction. This is because the field element core 10 is made of a material having high magnetic permeability, and the magnitude of the magnetic resistance received by the magnetic field for magnetization greatly depends on the first magnetic body 400 and the second magnetic body 410 having low magnetic permeability. Because it does. Therefore, by making the distance (twice the radial thickness) through the first magnetic body 400 in the first path shorter than the distance (circumferential thickness) through the second magnetic body 410 in the second path, The magnetoresistance in the first path can be made smaller than the magnetoresistance in the second path. In addition, since the magnetic permeability of the air gap is low, an air gap that is adjacent to the circumferential direction in contact with the second magnetic body 410 is provided, and the sum of the thickness of the second magnetic body 410 in the circumferential direction and the width of the air gap in the circumferential direction is A structure wider than twice the thickness of the first magnetic body 400 in the radial direction may be employed.

  Next, the second field magnet 41 is formed by magnetizing the second magnetic body 410 with the divided field element core 30 removed. FIG. 4 shows a state where the second magnetic body 410 is magnetized to form the second field magnet 41. FIG. 4 shows a part of the field elements in the circumferential direction as viewed along the rotation axis P.

  First, the split field element core 30 is removed in step S3. However, when the split field element core 30 is simply removed, the second magnetic body 410 may be detached from the split field element core 20. Since the first field magnet 40 is magnetized, an attractive force is exerted between the first field magnet 40 and the divided field element core 20, so that the first field magnet 40 is fixed to the divided field element core 20.

  In order to fix the second magnetic body 410, for example, a non-magnetic dummy split field element core 50 having the same shape as the split field element core 30 may be replaced with the split field element core 30. For example, the dummy divided field element core 50 may be pressed against the divided field element core 30 from one side in the axial direction, and the divided field element core 30 may be pushed out along the axial direction by the dummy divided field element core 50.

  Next, in step S4, the plurality of magnetizing magnetic pole surfaces 60a are opposed to the plurality of first magnetic bodies 400 from the side opposite to the first magnetic body 400 with respect to the divided field element core 20, respectively. A magnetizing magnetic field is generated from the magnetic pole surface 60a with the same polarity as step S2. This will be specifically described below.

  The magnetizer is arranged with respect to the first magnetic body 400 so that the magnetizing magnetic pole surface 60a and the first magnetic body 400 face each other with the same correspondence as in step S2. As a result, a magnetizing magnetic field is generated from the magnetizing magnetic pole surface 60a with the same polarity as in step S2.

  According to this positional relationship, the first field magnet 40 is covered with the nonmagnetic material having a low permeability on the rotation axis P side, so that the magnetic flux flowing out from the magnetizing magnetic pole surface 60 a passes through the first field magnet 41. Rather, the magnetic flux passes through the second magnetic body 410 in the circumferential direction, so that the second magnetic body 410 is magnetized in the circumferential direction to form the second field magnet 41. Such a magnetic flux is indicated by an arrow in FIG. Since magnetic fluxes in opposite directions pass through the second magnetic bodies 410 adjacent in the circumferential direction, they are magnetized in opposite directions. At this time, since the magnetic field for magnetization in the same direction as that in step S2 is applied to the second magnetic body 410, the second magnetic body 400 that is positioned on both sides of the first magnetic body 400 that is magnetized toward the side opposite to the rotation axis P is used. The magnetization direction of the magnetic body 410 is directed to the opposite side of the rotation axis P with respect to the first magnetic body 400. Therefore, the first field magnet 40 and the second field magnet 41 can be formed by realizing the Halbach arrangement shown in FIG. If the dummy divided field element core 50 is a metal having a high conductivity, the generation of eddy currents flowing in the dummy divided field element core 50 prevents the magnetic flux from entering the first field magnet 40, and the second field magnet 41 is further reduced. Increases the magnetic flux.

  Also in step S4, since the magnetizing magnetic pole surface 60a is disposed so as to face all of the plurality of first magnetic bodies 400, the plurality of second magnetic bodies 410 can be magnetized simultaneously in one process.

  Next, in step S5, the split field element core 30 is attached again. For example, the dummy split field element core 50 may be replaced with the split field element core 30 as in step S3.

  According to such a manufacturing method, the first magnetic body 400 and the second magnetic body 410 are respectively in a state where the first magnetic body 400 and the second magnetic body 410 are fixed to each other in both steps S2 and S4. Magnetized. Therefore, when the first field magnet 40 after magnetization and the second field magnet 41 after magnetization are arranged and fixed according to the Halbach array, they are attracted or repelled to make arrangement and fixing difficult. , Manufacturing inconveniences can be avoided.

  The magnetizer need not be specially made exclusively for magnetization, and for example, an armature disposed opposite to the field element 1 may be used. For example, when the armature is composed of three-phase concentrated winding coils, and the ratio of the number of teeth and the number of first magnetic bodies 400 is 2: 3, in each of steps S2 and S4, The first field magnet 40 and the second field magnet 41 may be formed by changing the position of the magnetizing magnetic pole surface 60a with respect to the field element 1 and magnetizing a plurality of times. Since this magnetizing method is described in Patent Documents 2 and 3, detailed description thereof is omitted.

  Further, a part of the second magnetic body 410 can be magnetized in step S2 and a part of the first magnetic body 400 can be magnetized in step S4, but this does not cause any adverse effects. This is because the direction in which the second magnetic body 410 is magnetized is the same in steps S2 and S4, and the direction in which the first magnetic body 400 is magnetized is also the same in steps S2 and S4.

<Execution order of magnetization of first magnetic body and magnetization of second magnetic body>
In the manufacturing method described above, the second magnetic body 410 is magnetized after the first magnetic body 400 is magnetized. However, even if the first magnetic body 400 is magnetized after the second magnetic body 410 is magnetized. Good. FIG. 5 is a flowchart showing an example of such a manufacturing method.

  First, the second field magnet 41 is formed by magnetizing the second magnetic body 410 with the divided field element core 30 removed. In step S11, the first magnetic body 400 and the second magnetic body 410 are disposed in the split field element core 20, and for example, the dummy split field core 50 is opposed to the split field core 20 in the radial direction. The first magnetic body 400 and the second magnetic body 410 are fixed. Next, in step S12, the second magnetic body 410 is magnetized to form the second field magnet 41. Such magnetization is similar to the magnetization in step S4.

  Next, the first magnetic body 400 is magnetized to form the first field magnet 40. In step S13, the split field element core 30 is attached. For example, the dummy divided field element core 50 and the divided field element core 30 are exchanged. Such exchange may be performed in the same manner as in step S5. Next, in step S14, the first magnetic body 400 is magnetized to form the first field magnet 40. Such magnetization is the same as the magnetization in step S2.

  Any of the effects described with reference to FIG. 2 can also be brought about by such a manufacturing method. In addition, since the second field magnet 41 is already formed when the first field magnet 40 is formed, the divided field element core is formed after the first field magnet 40 and the second field magnet 41 are formed. There is no need to remove 30. Therefore, the field element 1 can be assembled with fewer steps. In addition, after the second magnetic body 410 is magnetized in step S12 and the second field magnet 41 is formed, the first magnetic body 400 is magnetized when the split field element core 30 is attached in step S13. In addition, since the contact surface between the second field magnet 41 and the split field element core 30 is also small, the attachment is easy. Also in this point, after the first field magnet 40 is formed in step S2, the divided field element core 30 that contacts the large field surface is removed in step S3, which is advantageous over the procedure of FIG. In any of the magnetization steps, the magnetic material that is not magnetized in the first magnetizing step is not necessarily provided in the first magnetizing step. However, it is desirable that the magnetic material is also provided in terms of strength, and even if part of the magnet is magnetized, it is in the same direction as magnetized in the second magnetizing step. There is no harmful effect.

Second embodiment.
FIG. 6 shows an example of a conceptual configuration of the field element according to the second embodiment. Compared to the first embodiment, the split field element core 20 further includes a part of the surfaces 32 and 34. The split field element core 30 has the remaining portions of the surfaces 32, 34. Specifically, the divided field element core 20 extends from between the surfaces 22 and 24 toward the divided field element core 30 along the radial direction and reaches portions of the surfaces 32 and 34. is doing. In other words, the divided field element core 20 includes the surfaces 22 and 24, the portion existing on the opposite side of the rotation axis P with respect to the first field magnet 40 and the second field magnet 41, and the surfaces 32 and 34. A part including a part and existing on the rotation axis P side has a structure in which the first field magnet 40 and the second field magnet 41 are connected to each other. As a result, the first field magnet 40 and the second field magnet 41 are sandwiched in the radial direction by the split field element core 20 at both ends in the circumferential direction.

  According to such a structure, the divided field element core 20 can hold the first field magnet 40 and the second field magnet 41 even when the divided field element core 30 is removed. In this case, in the method of manufacturing a field element described with reference to FIG. 2 or FIG. 5, the dummy split field element core 50 described in step S3 or step S11 can be made unnecessary. Cost can be reduced.

  The divided field element core 20 may have a part of one of the surfaces 32 and 34. In this case, the split field element core 20 can hold either the first field magnet 40 or the second field magnet 41, respectively. Further, when the split field element core 20 does not have the surface 32 but has a part of the surface 34, the following effects are brought about when the field element 1 is manufactured according to the flowchart shown in FIG. That is, at the time of magnetizing the second magnetic body 410 (step S4), the first magnetic body 400 is already magnetized and the first field magnet 40 is formed. An attractive force acts between the magnetic core 20. Therefore, the first field magnet 40 is fixed to the divided field element core 20 with the divided field element core 30 removed. Since the second magnetic body 410 is held by the divided field element core 20, the dummy divided field element core 50 can be eliminated in step S3.

  FIG. 7 shows another example of the conceptual configuration of the field element 1 according to the second embodiment. Compared with the field element 1 shown in FIG. Each of the plurality of second field magnets 41 includes two field magnets 411 and 412. The field magnets 411 and 412 are adjacent in the circumferential direction. These have a rectangular parallelepiped shape, for example, and are arranged so that the longitudinal direction thereof is substantially along the radial direction in a cross section perpendicular to the rotation axis P. The field magnets 411 and 412 existing in one between the first field magnets 40 in the circumferential direction are magnetized in the same circumferential direction.

  The field element core 10 has a first insertion hole 141 through which the field magnet 411 is inserted and a second insertion hole 142 through which the field magnet 412 is inserted. The first through hole 141 has a pair of surfaces 241 and 341 that sandwich the field magnet 411 in the radial direction, and the second through hole 142 has a pair of surfaces 242 and 342 that sandwich the field magnet 412 in the radial direction. is doing.

  The divided field element core 20 has surfaces 22, 241, 242, 341, 342 and a part of the surface 32. Specifically, it extends from between the surfaces 241 and 242 in the circumferential direction toward the rotation axis P, reaches the surfaces 341 and 342, and further extends in the circumferential direction to a part of the surface 32. It has a part to reach. In other words, the space between the field magnets 411 and 412 is filled with the divided field element core 20, the field magnets 411 and 412 are sandwiched in the radial direction by the divided field element core 20, and the first field magnet 40 is It is sandwiched in the radial direction by the split field element core 20 at both ends in the direction.

  The core filled between the field magnets 411 and 412 improves the q-axis inductance. This is preferable from the viewpoint that the difference between the d-axis inductance and the q-axis inductance is increased and reluctance torque is easily obtained.

  The split field element core 30 has the remaining part of the surface 32.

  Even with such a structure, similarly to the field element 1 shown in FIG. 6, the divided field element core 20 has the first field magnet 40 and the second field magnet with the divided field element core 30 removed. 41 can be held. Therefore, any of the effects described with reference to FIG. 6 can be brought about. The divided field element core 20 may not have the surface 32. The effects achieved in this case are also as described with reference to FIG.

  FIG. 8 shows another example of the conceptual configuration of the field element according to the second embodiment. The differences will be described in comparison with the field element shown in FIG. The divided field element core 20 has a thin portion 23 that covers the first field magnet 40 and the second field magnet 41 on the divided field element core 30 side. The thin portion 23 has surfaces 32 and 34. In other words, the split field element core 20 has the first through hole 12 and the second through hole 14. The first through hole 12 and the second through hole 14 are spaced apart from each other in the circumferential direction. The divided field element core 20 includes the surfaces 22 and 24, a portion existing on the opposite side of the rotation axis P with respect to the first field magnet 40 and the second field magnet 41, and a thin portion 23. The field magnet 40 and the second field magnet 41 are connected to each other.

  Since the thin portion 23 has a very small thickness in the radial direction, the thin portion 23 is easily magnetically saturated in a state in which the divided field element core 30 is removed. Therefore, in step S4 or step S12, the magnetic flux from the magnetizing magnetic pole surface 60a is less likely to pass through the thin portion 23, and the second through the second magnetic body 410 rather than the first path through the first magnetic body 400. Pass through the route. Therefore, even with such a structure, the field element 1 can be manufactured based on the flowchart shown in FIG. 2 or FIG. In addition, since the first field magnet 40 and the second field magnet 41 can be fixed in a state in which the split field element core 30 is removed, the same effect as the field element shown in FIG. 6 can be obtained. .

Third embodiment.
FIG. 9 shows a configuration of a conceptual example of a field element according to the third embodiment. The differences will be described in comparison with the field element shown in FIG. The divided field element core 20 has surfaces 241 and 242, and the divided field element core 30 has surfaces 341 and 342. The split field element core 20 has a first protrusion 26 that protrudes from between the surfaces 241 and 242 toward the split field element core 30. The divided field element core 30 has a second protrusion 36 that protrudes from between the surfaces 341 and 342 to the divided field element core 20. The second protrusion 36 is in contact with the first protrusion 26 in the radial direction. In other words, the first protrusion 26 and the second protrusion 36 abut between the field magnets 411 and 412.

  According to such a structure, the set of the first protrusion 26 and the second protrusion 36 interposed between the field magnets 411 and 412 can improve the q-axis inductance.

  Next, in the case where the field element core 10 is composed of electromagnetic steel sheets laminated in the axial direction, a case where the shape of the divided field element cores 20 and 30 viewed from the axial direction is punched from one electromagnetic steel sheet will be considered. . For example, the shape of the split field element cores 20 and 30 is punched from one electromagnetic steel sheet in the positional relationship of the split field element cores 20 and 30 shown in FIG. In this case, the shape of the split field element cores 20 and 30 is punched in a state where the first protrusion 26 and the second protrusion 36 are in contact with each other. However, there is a possibility that the peripheral edges of the split field element cores 20 and 30 are scraped off by punching, and in this case, a gap is generated between the first protrusion 26 and the second protrusion 36.

  The shape and the punching method of the divided field element cores 20 and 30 for solving such a problem will be described.

  The divided field element cores 20 and 30 are separated from each other in the radial direction except for the contact surfaces of the first protrusion 26 and the second protrusion 36. In other words, the divided field element core 20 has a surface 22, and the surfaces 22, 241, and 242 are connected to each other without contacting the divided field element core 30 except for the contact surface. The divided field element core 30 has a surface 32, and the surfaces 32, 341, and 342 are continuous without contacting the divided field element core 30 except for the contact surface.

  The width in the circumferential direction of the first protrusion 26 and the second protrusion 36 is narrower than the width in the circumferential direction of the through holes 141 and 142.

  FIG. 10 shows the positional relationship between the divided field element cores 20 and 30 when a predetermined electromagnetic steel sheet is punched out. As described above, the split field element cores 20 and 30 are separated from each other except the contact surface, and the widths of the first protrusion 26 and the second protrusion 36 in the circumferential direction are the through holes 141 and 141 in the circumferential direction. It is narrower than the width of 142. As a result, as shown in FIG. 10, as the shape of the divided field element cores 20 and 30 on the magnetic steel sheet, the positional relationship in which the divided field element core 30 is shifted in the circumferential direction with respect to the divided field element core 20. Can be applied. In other words, the relative position between the first protrusion 26 and the second protrusion 36 is shifted in the circumferential direction, the second protrusion 36 faces the surface 241, and the first protrusion 26 faces the surface 342. Yes.

  According to this positional relationship, the divided field element cores 20 and 30 before constituting the field element core 10 are separated from each other in an arbitrary radial direction. Therefore, even if these peripheral edges are cut by punching, the length in the radial direction of at least one of the first protrusion 26 and the second protrusion 36 can be set longer in advance in consideration of the length to be cut off. An example of such a shape is indicated by a broken line in FIG. Thereby, when the shape of the divided field element cores 20 and 30 is punched from the electromagnetic steel sheet, the first protrusion 26 and the second protrusion 36 can be brought into contact with each other more reliably.

  Then, a predetermined electromagnetic steel sheet is punched to form an electromagnetic steel sheet for the divided field element cores 20 and 30, and the electromagnetic steel sheets are laminated in the axial direction to manufacture the divided field element cores 20 and 30.

  FIG. 11 shows another example of the conceptual configuration of the field element according to the third embodiment. FIG. 11 shows a part of the field element in the circumferential direction. The differences will be described in comparison with the field element shown in FIG. The contact surface between the first protrusion 26 and the second protrusion 36 is inclined with respect to the circumferential direction. In FIG. 1, one first protrusion 26 and one second protrusion 36 are shown, but the plurality of first protrusions 26 and the plurality of second protrusions 36 are in contact with each other. All of the contact surfaces are inclined in the same direction with respect to the circumferential direction. The divided field element cores 20 and 30 are separated from each other in the radial direction except for the contact surface.

  FIG. 12 shows the positional relationship of the field element core 10 when the divided field element core 30 is shifted in the circumferential direction with respect to the divided field element core 20. Since the divided field element cores 20 and 30 are separated from each other in the radial direction except for the contact surface, the divided field element core 30 can be shifted in the circumferential direction with respect to the divided field element core 20. Further, since the plurality of contact surfaces are inclined in the same direction, the first protrusion is obtained by rotating the divided field element core 30 in the circumferential direction with respect to the divided field element core 20 from the state shown in FIG. The portion 26 and the second protrusion 36 can be brought into contact with each other. Therefore, it can be assembled easily.

  In addition, the shape of the split field element cores 20 and 30 may be punched out from a predetermined electromagnetic steel sheet in the positional relationship shown in FIG. In this case, similarly to the punching method described with reference to FIG. 10, the first protrusion 26 and the second protrusion 36 can be brought into contact with each other more reliably.

  The widths of the first protrusions 26 and the second protrusions 36 in the circumferential direction may be wider than the widths of the through holes 141 and 142. Since all of the plurality of contact surfaces are inclined in the same direction with respect to the circumferential direction, the divided field element core 30 can be rotated slightly with respect to the divided field element core 20 in the circumferential direction. A gap is generated between the first protrusion 26 and the second protrusion 36. Thereby, the length in the radial direction of at least one of the first protrusion 26 and the second protrusion 36 can be punched out in advance. As a result, even if the peripheral edges of the split field element cores 20 and 30 are cut by punching, the first protrusion 26 and the second protrusion 36 can be brought into contact with each other more reliably.

  In the third embodiment, the first protrusion 26 and the second protrusion 36 are described as being interposed between the field magnets 411 and 412, but the present invention is not limited to this. For example, in the field element 1 shown in FIG. 1, the divided field element cores 20 and 30 may be in contact with each other in the radial direction between the first field magnet 40 and the second field magnet 41. . More specifically, the split field element core 20 has a first protrusion that protrudes from between the surfaces 22 and 24 toward the split field element core 30, and the split field element core 30 has the surface 32. , 34 may protrude from each other to the split field element core 20, and the first protrusion and the second protrusion may be in contact with each other in the radial direction.

Fourth embodiment.
In the fourth embodiment, the easy magnetization direction of the first field magnet will be described. The conceptual configuration of the field element according to the fourth embodiment is the same as that of the field element described in any of the first to third embodiments. As an example, FIG. 13 shows an example of a part of the field element according to the fourth embodiment in the circumferential direction. Such a field element has the same structure as the field element shown in FIG. The easy magnetization direction of the first field magnet 40 is inclined toward the center of itself in the circumferential direction. Such an easy magnetization direction is indicated by an arrow in FIG.

  According to such a field element 1, for example, when the second magnetic body 410 is magnetized (step S4 in FIG. 2 or step S2 in FIG. 5), the magnetic flux from the magnetizing magnetic pole surface is changed to the first magnetic body. Both ends in the circumferential direction of 400 are along the easy magnetization direction of the first magnetic body 400 (see also FIG. 4). Therefore, both ends of the first magnetic body 400 in the circumferential direction can be magnetized during the magnetization process of the second magnetic body 410.

  Further, when the rotary electric machine is configured with the armature opposed to the field element 1 in the radial direction, the first field magnet 40 supplies the field magnetic flux to the armature toward the center in the circumferential direction. Can be improved.

Fifth embodiment.
In the fifth embodiment, the plurality of first field magnets 40 equalize the magnetic fluxes respectively supplied to the armature. The conceptual configuration of the field element according to the fifth embodiment is the same as that of the field element described in any one of the first to fourth embodiments. However, the field element core 10 is composed of electromagnetic steel plates laminated in the axial direction. This electrical steel sheet has magnetic properties corresponding to its rolling direction. Specifically, even in the case of a non-oriented electrical steel sheet, the magnetic properties in the rolling direction are superior to those in other directions. Therefore, the rolling directions of the cores can be made different between the surface where the first field magnet 40 is in contact with the split field element core 20 and the surface where the first field magnet 40 is in contact with the split field element core 30. it can.

  The rolling direction of the split field element core 20 and the rolling direction of the split field element core 30 are inclined with each other to constitute the field element core 10. More specifically, it is inclined by an angle closest to 90 degrees among multiples of a value obtained by dividing 360 degrees by the number of poles of the field element (the number of first field magnets).

  FIG. 14 shows an example of a part in the circumferential direction of the field element according to the fifth embodiment. FIG. 14 has the same configuration as the field element according to the first embodiment. The rolling direction of the divided field element core 20 is parallel to the first field magnet 40. The rolling direction of the split field element core 30 is inclined by 90 degrees with respect to the rolling direction of the split field element core 20.

  Therefore, in each of the plurality of first field magnets 40, the absolute value of the angle of the rolling direction of the divided field element core 20 with respect to the line connecting the magnetic pole center and the rotation center of the first field magnet 40, and the divided field element Regarding the angle obtained by averaging the rolling direction of the core 30 and the absolute value of the angle with respect to the line connecting the magnetic pole center of the first field magnet 40 and the rotation center, the angle of the direction with respect to the corresponding first field magnet 40 is all 45 ° at the pole. Therefore, the operating point magnetic flux density can be made uniform for each of the plurality of first field magnets 40. Therefore, the magnetic flux generated from the outer peripheral side of the field element 1 can be made uniform.

  In addition, it is not always necessary to incline the rolling direction of the divided field element cores 20 and 30 by the above-described angle. If the rolling directions of the divided field element cores 20 and 30 are inclined to each other, a plurality of first field magnets are used. For each of the magnets 40, it is possible to suppress variations in magnetic flux generated from the outer peripheral side of the field element 1.

  Further, the rolling direction of the divided field element cores 20 and 30 is not limited to the number of poles, and may intersect each other at 90 degrees. In order to realize this, for example, the field element core 10 may be manufactured as follows. The divided field element cores 20 and 30 are formed by punching from one electromagnetic steel sheet. Specifically, the divided field element cores 20 and 30 are punched so that the angle formed by the rolling direction of the electromagnetic steel sheet is 45 ° with respect to a reference line on which the field element core 10 is symmetric. FIG. 15 shows a state in which this is omitted. In FIG. 15, the reference line is indicated by a broken line, and the rolling direction of the electromagnetic steel sheet is indicated by an arrow.

  Then, only one of the punched divided field element cores 20 and 30 is inverted with respect to the reference line, and the divided field element cores 20 and 30 are assembled. Thereby, the rolling direction of the divided field element core 20 and the rolling direction of the divided field element core 30 intersect each other at 90 degrees (see the divided field element cores 20 and 30 shown in FIG. 14).

  In FIG. 15, the reference line passes between the poles, but may pass through the center of the magnetic pole.

It is a figure which shows an example of a notional structure of the field element concerning 1st Embodiment. It is a flowchart which shows an example of the manufacturing method of a field element. It is a figure which shows a mode that a 1st magnetic body is magnetized and a 1st field magnet is formed. It is a figure which shows a mode that a 2nd magnetic body is magnetized and a 2nd field magnet is formed. It is a flowchart which shows another example of the manufacturing method of a field element. It is a figure which shows an example of a notional structure of the field element concerning 2nd Embodiment. It is a figure which shows another example of the notional structure of the field element concerning 2nd Embodiment. It is a figure which shows another example of the notional structure of the field element concerning 2nd Embodiment. It is a figure which shows an example of a notional structure of the field element concerning 3rd Embodiment. It is a figure which shows the positional relationship between division field element cores. It is a figure which shows another example of the notional structure of the field element concerning 3rd Embodiment. It is a figure which shows the positional relationship between division field element cores. It is a figure which shows an example of a notional structure of the field element concerning 4th Embodiment. It is a figure which shows an example of a notional structure of the field element concerning 5th Embodiment. It is a figure which shows a mode that a division | segmentation field element core is punched.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Field element 10 Field element core 20, 30 Division field element core 22, 24, 32, 34, 241, 341, 242, 342 Surface 26 First protrusion 36 Second protrusion 40 First field magnet 41 Second field magnet 411, 412 Field magnet

Claims (18)

A plurality of first poles arranged in a ring around a predetermined axis (P), exhibiting magnetic pole faces in the radial direction centered on the axis, and different polarities of the adjacent magnetic pole faces in the circumferential direction centered on the axis. One field magnet (40);
A second field magnet (41), each disposed between two of the first field magnets adjacent in the circumferential direction, and presenting a magnetic pole surface in the circumferential direction;
A field element comprising a field element core (10) through which the first field magnet and the second field magnet are inserted along an axial direction along the axis;
The field element core has a first divided field element core (20) and a second divided field element core (30),
At least part of the first divided field element core and the second divided field element core sandwich the first field magnet (40) from opposite sides in the radial direction centered on the axis,
A field element in which the magnetic pole faces of the second field magnets facing each other in the circumferential direction have the same polarity.   The second field magnet (41) is sandwiched between at least a part of the first divided field element core (20) and the second divided field element core (30) in a radial direction thereof. The field element described.   The first split field element core (20) has a pair of surfaces (24, 34; 242, 342) that are radially opposed to each other via the second field magnet (41; 411, 412). The field element according to claim 1 or 2.   The said 1st division | segmentation field element core (20) has a pair of surface (22, 32) which opposes mutually in a radial direction via the said 1st field magnet (40). The field element according to one.   The first divided field element core (20) includes a thin part that covers the first field magnet (40) on the second divided field element core (30) side, and the thin part is formed of the pair of surfaces. The field element according to claim 4, which exhibits one (32, 34). The first divided field core (20) has a plurality of first surfaces (241, 242), and the second divided field core (20) has a plurality of second surfaces (341, 342). The first and second surfaces are opposed to each other in the radial direction via each of the plurality of second field magnets (41),
The first divided field element core has a plurality of first protrusions (26) protruding in the radial direction from each of the first surfaces toward the second divided field element core,
The second divided field element core protrudes in the radial direction from each of the second surfaces toward the first divided field element core, and is in contact with each of the first protrusions in the radial direction. A plurality of second protrusions (36) abutting at
A plurality of the contact surfaces are all inclined to the same side with respect to the circumferential direction,
3. The field element according to claim 1, wherein the first divided field element core and the second divided field element core are separated from each other in the radial direction except for the contact surface. Each of the second field magnets (41) includes two third field magnets (411) adjacent to each other around the axis between the first field magnets (40) sandwiching the second field magnet. And a fourth field magnet (412),
The field element according to claim 6, wherein the first protrusion and the second protrusion are in contact between the third and fourth field magnets. The first divided field element core (20) and the second divided field element core (30) have a plurality of laminated steel plates laminated in the axial direction,
The 1st rolling direction of the said laminated steel plate which the said 1st division field element core has, and the 2nd rolling direction of the said lamination steel plate which the said 2nd division field element core have are mutually inclined. 8. The field element according to any one of 1 to 7.   The field element according to claim 8, wherein the first rolling direction and the second rolling direction are orthogonal to each other. A plurality of first field magnets (40) and a plurality of second field magnets (41) arranged alternately around a predetermined axis (P);
A field element core (10) through which the first field magnet and the second field magnet are inserted along the axial direction along the axis;
The field element core has a first divided field element core (20) and a second divided field element core (30),
The first divided field element core and the second divided field element core manufacture a field element that sandwiches the first field magnet (40) from opposite sides in the radial direction centered on the axis. A manufacturing method comprising:
A plurality of hard magnetic first magnetic bodies (400) that become the first field magnet after magnetization and a plurality of hard magnetic second magnetic bodies (410) that become the second field magnet after magnetization are fixed. For the first divided field core,
(A) The second divided field element core (30) is opposed to the first divided field element core in a radial direction about the axis, and the first magnetic body and the second magnetic body are opposed to the first divided field element core. From the opposite side, a plurality of magnetization magnetic pole surfaces (60a) are opposed to the first magnetic bodies in the radial direction centered on the axis, respectively, and the magnetization magnetic field is introduced from the magnetization magnetic pole surface. A first step of forming the first field magnet by magnetizing the first magnetic body;
(B) With the second divided field element core removed, the plurality of magnetizing magnetic pole faces are made to face the first magnetic bodies, respectively, and the same as the first step from the magnetizing magnetic pole face. A field element manufacturing method, wherein the second step of generating the magnetizing magnetic field with polarity and magnetizing the second magnetic body to form the second field magnet is executed.   The field element manufacturing method according to claim 10, wherein the second step is performed before the first step.   The said 2nd field magnet (41) is pinched | interposed by at least one part of the said 1st division field core (20) and the said 2nd division field element core (30) in the said radial direction. 11. A method for producing a field element according to 11.   The first split field element core (20) has a pair of surfaces (24, 34; 242, 342) that are radially opposed to each other via the second field magnet (41; 411, 412). The method for producing a field element according to claim 10.   The said 1st division | segmentation field element core (20) has a pair of surface (22, 32) which opposes mutually in a radial direction via the said 1st field magnet (40). The manufacturing method of the field element as described in one.   The first split field element core (40) includes a thin part covering the first field magnet (41) on the first split field element core (41) side, and the thin part is the first field magnet. 15. The method of manufacturing a field element according to claim 14, wherein the pair of surfaces (22, 32) facing each other in the radial direction are formed via a magnet (40). The first divided field core (20) has a plurality of first surfaces (241, 242), and the second divided field core (20) has a plurality of second surfaces (341, 342). The first and second surfaces are opposed to each other in the radial direction via each of the plurality of second field magnets (41),
The first divided field element core has a plurality of first protrusions (26) protruding in the radial direction from each of the first surfaces toward the second divided field element core, The two-segment field core has a plurality of second protrusions (36) projecting in the radial direction from each of the second surfaces toward the first segment field core,
In the field element, each of the first protrusions and each of the second protrusions abut on a contact surface in the radial direction, and the first divided field element core and the second divided field element The cores are separated from each other in the radial direction except for the contact surface,
The length of the first surface in the circumferential direction is wider than the width of the second protrusion in the circumferential direction, and the length of the second surface in the circumferential direction is the width of the first protrusion in the circumferential direction. Wider than
In a predetermined steel plate, the first divided field element core and the second divided field element core viewed from the axial direction in a positional relationship in which the first protrusion and the second protrusion are shifted in the circumferential direction. 12 is punched out to form a laminated steel sheet for the first divided field element core and the second divided field element core, and the laminated steel sheet is laminated in the axial direction. Manufacturing method of field element.   The field element manufacturing method according to claim 16, wherein a plurality of the contact surfaces are all inclined in the same direction with respect to the circumferential direction. Each of the second field magnets (41) includes two third field magnets (411) adjacent to each other around the axis between the first field magnets (40) sandwiching the second field magnet. And a fourth field magnet (412),
The field magnet according to claim 16 or 17, wherein in the field element, the first protrusion (26) and the second protrusion (36) abut between the third and fourth field magnets. Child manufacturing method.

Images