JP2008193886A - Rotor, rotary electric machine, and manufacturing method of the rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently utilize the magnetic flux generated in a magnet. <P>SOLUTION: A magneton 12 includes the magnet 126 and a magnetic material plate 128. A plurality of the magnets 126 are provided and arranged into a ring, along a circumferential direction 93, respectively. Each of the magnets 126 has a magnetic pole surface 126i, on the side of a radial direction 94 of the ring and a magnetic pole surface 126h on a side opposite to the radial direction; the magnetic material plate 128 covers the magnetic pole surface 126i, while exposing at least a part of the magnetic pole surface 126i, in a direction 92 along a center axis 91; and a pair of the magnetic material plates 128, covering each of the magnets 126 which are adjacent to each other along the circumferential direction 93, are mutually separated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a field element and a rotating electric machine, and more particularly to a surface magnet type and radial gap type field element and rotating electric machine.

  A surface magnet type and radial gap type rotating electrical machine includes an armature having teeth and a field element having magnets. One of the field element and the armature is employed as a rotor that rotates about a central axis as a rotation axis, and the other is employed as a stator.

  The magnet and the teeth face each other through an air gap. The entire surface on the teeth side of the magnet is exposed. In order to prevent leakage of magnetic flux generated by the magnet, in other words, in order to link most of the magnetic flux to the armature, the length in the direction along the rotation axis is almost the same between the magnet and the teeth facing each other. It is.

  In addition, the technique relevant to this invention is shown below.

Japanese Patent No. 3580878 JP 2001-244110 A JP 2005-198447 A

  However, since the winding is disposed on the teeth, the rotating electrical machine becomes larger in the direction along the rotation axis by the thickness of the winding. In this direction, if the length of the armature including the winding is made the same as the length of the magnet, the length of the teeth becomes smaller than the length of the magnet, and the magnetic flux generated by the magnet leaks. Hereinafter, the leakage of the magnetic flux will be described.

  FIG. 18 partially shows the configuration of the main part of the rotating electrical machine 9 of surface magnet type, radial gap type and outer rotor type when the length of the teeth is smaller than the length of the magnet in the direction along the rotation axis. It is a perspective view.

  As shown in FIG. 18, the rotating electrical machine 9 includes a ring-shaped rotor magnet 926 having a radially inner side surface 926 i whose magnetic poles alternate alternately along the circumferential direction, and a ring that covers the radially outer surface 926 h of the rotor magnet 926. And a yoke 924 having a shape.

  Further, the rotating electrical machine 9 includes a stator having a stator core 942. Stator core 942 includes teeth 9422 around which a coil (not shown) is wound. The teeth 9422 extend radially outward in the radial direction and face the radial inner side surface 926i of the rotor magnet 926 at the tip.

  FIG. 19 is a schematic diagram partially showing the rotor magnet 926 and the stator core 942 as viewed from the radially inner side. FIG. 20 is a schematic diagram partially showing the rotor magnet 926, the yoke 924, the stator core 942, and the coil 944 viewed from the circumferential direction.

  Since the magnetic poles of the rotor magnet 926 alternate along the circumferential direction, different magnetic poles are adjacent to each other on the radially inner side surface 926i. Accordingly, as shown in FIG. 19, the leakage magnetic flux LM flows between one magnetic pole and the other magnetic pole of the radially inner side surface 926 i at a position not facing the teeth 9422.

  Further, since the yoke 924 is provided, as shown in FIG. 20, a leakage magnetic flux LM that does not link with the teeth 9422 also flows between the radial inner side surface 926 i and the yoke 924.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to efficiently use magnetic flux generated by a magnet.

  The field element according to claim 1 of the present invention is arranged in a ring around the central axis (91) along the circumferential direction (93), and the first ring element is disposed on one side in the radial direction (94). A magnetic plate that covers the first magnetic pole surface while exposing at least part of the first magnetic pole surface in the direction (92) along the central axis. The pair of magnetic plates that respectively cover the first magnetic pole surfaces of the magnets adjacent to each other are spaced apart from each other.

  A field element according to a second aspect of the present invention is the field element according to the first aspect, wherein the magnet (126) is provided with a groove (1261) into which the magnetic plate (128) is fitted. .

  A field element according to a third aspect of the present invention is the field element according to the first aspect, wherein the one side of the magnetic plate (128) opens toward the one side, and the center A pair of recesses (128c) extending in the direction (92) along the axis is provided.

  A field element according to a fourth aspect of the present invention is the field element according to the second or third aspect, further comprising an annular non-magnetic body (120) for pressing the magnetic plate from the one side.

  A field element according to a fifth aspect of the present invention is the field element according to the first to fourth aspects, wherein the magnet (126) has a second magnetic pole on the other side in the radial direction (94). It further includes a yoke (124) that is provided between the second magnetic pole surfaces of the magnets (126) adjacent to each other and exhibiting a surface (126h).

  A field element according to a sixth aspect of the present invention is the field element according to the fifth aspect, wherein the yoke (124) has the end face (126u) in the direction (92) of the magnet (126). The portion (1242) of the yoke that covers the end surface of the magnet is recessed to the other side with respect to the first magnetic pole surface (126i).

  A field element according to a seventh aspect of the present invention is the field element according to the sixth aspect, wherein the portion (1242) of the yoke (124) has at least the magnet (94) in the radial direction (94). 126) is retracted to the vicinity of the center of the end face (126u).

  An electric rotating machine according to an eighth aspect of the present invention is the field element (12) according to any one of the first to seventh aspects, and the magnetic plate (128) side with respect to the field element. And an armature (14) provided on the machine.

  A rotating electric machine according to a ninth aspect of the present invention is the rotating electric machine according to the eighth aspect, wherein the armature (14) includes a tooth (142) facing the magnetic plate (128), In the direction (92) along the central axis (91), the teeth are smaller than the magnet (126).

  A field element manufacturing method according to the present invention is a method for manufacturing a field element (12) according to claim 1. First, the magnetic plate (128) and an annular yoke (124) on the other side in the radial direction (94) from the magnetic plate are positioned in the container (8), and the magnetic plate and the yoke are positioned. A bond magnet material having fluidity is poured between the magnets, the bond magnet material is solidified, and the bond magnet material is magnetized to form the magnet (126).

  Preferably, the magnetic plate (128) and the yoke (124) are connected by a non-magnetic material (81) and then placed in the container for positioning.

  According to the field element according to claim 1 of the present invention, at least a part of the magnetic flux flowing into and out of the first magnetic pole face exposed without being covered with the magnetic plate avoids a space near the surface, It passes through a magnetic plate with higher magnetic permeability. Therefore, in the armature facing the field element on the magnetic plate side, it is possible to employ a tooth whose length in the direction along the central axis is smaller than that of the magnet. In addition, the magnetic flux does not flow in a short circuit between the magnetic plates in the direction along the circumferential direction. Thereby, the magnetic flux generated by the magnet is efficiently used as the field magnetic flux.

  According to the field element of claim 2 of the present invention, since the magnetic body plate can be fixed to the magnet only by fitting the magnetic body plate into the groove, the manufacture of the field element is simple.

  According to the field element according to claim 3 of the present invention, the cogging torque can be reduced.

  According to the field element of the fourth aspect of the present invention, the magnetic plate can be fixed in close contact with the first magnetic pole surface.

  According to the field element of the fifth aspect of the present invention, the magnetic flux generated on the second magnetic pole surface of the magnet opposite to the magnetic plate can be guided to the magnetic plate side by providing the yoke. it can. Thus, the magnetic properties of the field element are enhanced.

  According to the field element of the sixth aspect of the present invention, since the cross-sectional area in the circumferential direction of the yoke is increased, magnetic saturation in the yoke is prevented. Moreover, since the portion of the yoke is retracted to the other side with respect to the first magnetic pole surface, short-circuiting of the magnetic flux through the portion between the first magnetic pole surface and the second magnetic pole surface is reduced. .

  According to the field element of claim 7 of the present invention, there is almost no short circuit of the magnetic flux through the portion of the yoke.

  According to the rotating electric machine according to claim 8 of the present invention, even when an armature having a smaller tooth than the magnet in the direction along the central axis is adopted, the magnetic flux generated by the field element magnet is linked to the armature. It's easy to do. Therefore, the length of the rotating electrical machine in the direction can be reduced without reducing the efficiency and output of the rotating electrical machine.

  According to the rotary electric machine according to claim 9 of the present invention, the armature is downsized in the direction along the central axis. Moreover, since the teeth face the magnetic plate, most of the magnetic flux flowing through the magnetic plate can be linked to the armature.

  According to the method for manufacturing a field element according to the present invention, the adhesion between the magnet and the magnetic plate is facilitated. If the magnetic plate and the yoke are connected with a non-magnetic material, it can be easily put in the container.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a rotating electrical machine 1 according to an embodiment of the present invention and a crossflow fan 5 for a room air conditioner indoor unit rotated by the rotating electrical machine 1.

  The cup-type fan connecting resin member 122 includes a cylindrical portion 122 c having a cylindrical axis coinciding with the central axis 91 and a disc portion 122 d perpendicular to the central axis 91. The fan connecting resin member 122 is made of a non-magnetic resin.

  A shaft 129 extending in the direction of the central axis 91 is fixed to the center of the disc portion 122d. The shaft 129 is rotatably held by the shaft receiver. The disc part 122d also serves as an end plate for fixing the plurality of wing parts 52 of the cross flow fan 5 at the end parts. Thereby, since the rotary electric machine 1 and the cross flow fan 5 are directly connected without passing through the shaft 129, the space between the rotary electric machine 1 and the cross flow fan 5 can be eliminated, and the rotary electric machine 1 and the cross flow fan are eliminated. 5 can be reduced in size.

  FIG. 2 is a perspective view conceptually showing the rotating electrical machine 1. FIG. 3 shows a cross section perpendicular to the circumferential direction of the rotating electrical machine 1 at a position AA shown in FIG. The rotating electrical machine includes a field element 12 and an armature 14. In the rotating electrical machine 1, either the field element 12 or the armature 14 is applied to the rotor that rotates about the central axis 91, and the other is applied to the stator. In FIG. 2, the field element 12 and the armature 14 are partially shown in the circumferential direction 93 around the central axis 91 in order to clarify the configuration of the field element 12 and the armature 14. .

  FIG. 4 is a schematic diagram partially showing the field element 12 and the armature 14 as viewed from the radially inner side.

  Referring to FIG. 1, field element 12 is mounted on the inner surface of cylindrical portion 122c, and armature 14 is housed and fixed inside cylindrical portion 122c. Thereby, in the aspect shown by FIG. 1, the field element 12 functions as a rotor and the armature 14 functions as a stator.

  The field element 12 includes a magnet 126 and a magnetic plate 128.

  A plurality of magnets 126 are provided, and are arranged in a ring along the circumferential direction 93. Each of the magnets 126 has a magnetic pole surface 126i on one side (here, the inner side) and a magnetic pole surface 126h on the other side (here, the outer side) in the radial direction 94.

  The magnetic plate 128 covers the magnetic pole surface 126i in the direction 92 along the central axis 91 while exposing at least a part of the magnetic pole surface 126i. In FIG. 2, the magnetic pole surface 126 i is exposed on both sides of the magnetic plate 128 in the direction 92.

  As shown in FIG. 3, the magnetic plate 128 is fitted into a groove 1261 provided in the magnet 126. Alternatively, it may be attached to the magnetic pole surface 126i. FIG. 5 is a cross-sectional view perpendicular to the circumferential direction of the field element 12 employing such sticking. However, the former is preferable because the manufacture of the field element 12 is simple. That is, the magnetic plate 128 can be fixed to the magnet 126 simply by fitting the magnetic plate 128 into the groove 1261.

  The pair of magnetic plates 128 that respectively cover the magnetic pole surfaces 126i of the magnets 126 adjacent to each other along the circumferential direction 93 are separated from each other.

  According to the field element 12, at least part of the magnetic flux flowing into and out of the magnetic pole surface 126 i that is exposed without being covered with the magnetic plate 128 avoids a space in the vicinity of the surface and has a higher magnetic permeability. 128. The technical significance of passing the magnetic flux flowing into and out of the exposed magnetic pole surface 126i through the magnetic plate 128 will be described later.

  In the field element 12, since the pair of magnetic plates 128 are separated from each other, the magnetic flux does not flow in a short circuit between the magnetic plates 128 in the direction along the circumferential direction 93. Therefore, the magnetic flux generated by the magnet 126 can be efficiently used as the field magnetic flux.

  From the viewpoint of enhancing the magnetic properties of the field element 12, it is desirable that the field element 12 further includes a yoke 124 as shown in FIGS. Specifically, a yoke 124 having an annular shape around the central axis 91 is provided from the side opposite to the armature 14 (FIGS. 2 and 3) with respect to the magnet 126.

  Such an aspect can be grasped as follows. That is, the yoke 124 is provided across the magnetic pole surfaces 126 h of the magnets 126 adjacent to each other along the circumferential direction 93.

  By providing the yoke 124, the magnetic flux can be short-circuited between the magnetic pole surfaces 126 h of the magnets 126 adjacent to each other along the circumferential direction 93, so that the magnetic flux generated on the magnetic pole surface 126 h can be reduced to the magnetic plate 128 side. Can lead to. Therefore, the magnetic characteristics of the field element 12 are enhanced.

  The yoke 124 may cover the end faces 126u and 126d in the direction 92 of the magnet 126. According to this aspect, since the cross-sectional area of the yoke 124 with respect to the circumferential direction 93 is increased, magnetic saturation in the yoke 124 is prevented, thereby reducing leakage magnetic flux.

  From the viewpoint of reducing the leakage flux, the yoke 124 may have the part 1241 and the part 1242 as separate bodies as shown in FIG. 6 showing a cross section perpendicular to the circumferential direction of the field element 12. Here, the portion 1241 covers the magnetic pole surface 126h, and the portion 1242 covers at least a part of the end surfaces 126u and 126d.

  In the yoke 124, it is desirable that the portion 1242 covering the end faces 126u and 126d is retracted toward the radial direction 94 with respect to the magnetic pole face 126i. This is because the short circuit of the magnetic flux through the portion 1241 between the magnetic pole surface 126i and the magnetic pole surface 126h is reduced.

  FIG. 7 is a cross-sectional view showing a cross section of the field element 12 perpendicular to the circumferential direction, and illustrates the case where the portion 1242 reaches the magnetic pole surface 126i. In this case, since the peripheral edge of the magnetic pole surface 126i and the tip of the portion 1242 approach each other, a leakage magnetic flux LM is likely to be generated between them.

  From the viewpoint of preventing a short circuit of magnetic flux through the portion 1241, it is desirable that the portion 1241 of the yoke 124 is retracted at least to the vicinity of the center of the end faces 126 u and 126 d of the magnet 126 in the radial direction 94.

  The magnet 126 and the yoke 124 may be made of a plastic magnetic material in which magnet powder is bonded with resin. In this case, there is an advantage that these can be integrally formed together with the fan connecting resin member 122 by injection molding.

  The armature 14 includes a tooth 142 and a winding 144 and is provided on the magnetic plate 128 side with respect to the field element 12. The teeth 142 are opposed to the magnetic plate 128. Winding 144 is disposed on tooth 142. However, the winding 144 is omitted in FIGS. 2 and 4 in order to avoid complication of the drawings.

  Here, since the case where the rotary electric machine 1 is an outer rotor type is illustrated, the teeth 142 extend radially outward in the radial direction and face the magnetic pole surface 126i at the tip. The tip of the teeth 142 extends in the circumferential direction in order to increase the flux linkage. The teeth 142 are made of a magnetic material such as iron. As a winding mode of the coil 144, either concentrated winding or distributed winding may be adopted.

  Even if the tooth 142 having a length in the direction 92 smaller than that of the magnet 126 is adopted, the magnetic flux generated by the magnet 126 can be efficiently linked to the armature 14. This is because even if a portion not facing the teeth 142 is on the magnetic pole surface 126i, at least a part of the magnetic flux flowing into and out of the portions flows into and out of the teeth 142 through the magnetic plate 128 as described above. It is.

  Therefore, the armature 14 can be downsized in the direction 92 without reducing the efficiency and output of the rotating electrical machine. In addition, since the teeth 142 are opposed to the magnetic plate 128, most of the magnetic flux flowing through the magnetic plate 128 can be linked to the armature 14.

  FIG. 8 is a plan view illustrating the configuration of deformation of the field element according to this embodiment. However, although omitted to avoid complication of the drawing, a yoke 124 may be provided on the side opposite to the magnetic plate 128 (that is, on the magnetic pole face 126h side).

  In this modification, the magnetic plate 128 has a recess 128 c that opens toward the central axis 91, and the magnetic plate 128 is thin at this position. A pair of recesses 128 c are provided extending in the direction 92.

  The magnets 126 are adjacent to each other in the circumferential direction at a boundary 126J (which is also a boundary between magnetic pole faces having different polarities), and when the angle at which the magnetic pole face 126i expands in the circumferential direction when viewed from the central axis 91 is θ, the recess 128c Is arranged at a position of approximately θ / 3 from the boundary 126J. Here, since the case where eight magnets 126 are provided is illustrated, θ = 45 degrees. Further, in FIG. 8, as an example of the recess 128c, the thickness of the magnetic plate 128 becomes zero at this position, and the magnetic plate 128 substantially covering each of the magnetic pole surfaces 126i is separated into three portions. The case is illustrated.

  FIG. 9 is a plan view illustrating the configuration of field elements per magnet 126. Here, unlike FIG. 8, the case where the magnetic plate 128 has a thickness although it is thin in the recess 128c is illustrated. In FIG. 9, the yoke 124 is also illustrated.

  The thickness of the magnetic plate 128 is substantially zero near the boundary 126J of the magnetic pole surface 126i. That is, the pair of magnetic plates 128 that respectively cover the magnetic pole surfaces 126i adjacent to each other are separated from each other. And between the boundary 126J and the recessed part 128c, the part 128b exists with the thickness of the magnetic body board 128 larger than the thickness of the magnetic body board 128 in the recessed part 128c. Further, a portion 128a exists between the pair of recesses 128c provided on the same magnetic pole surface 126i with a thickness of the magnetic plate 128 larger than the thickness of the magnetic plate 128 in the recess 128c. In other words, the portion 128a is located at the center of the magnetic pole surface 126i with respect to the portion 128b and the recess 128c.

  For example, the thickness of the magnetic plate 128 in the portion 128a is larger than the thickness of the magnetic plate 128 in the portion 128b. For example, the thickness of the magnetic plate 128 decreases stepwise from the portion 128a toward the recess 128c, and the thickness of the magnetic plate 128 decreases stepwise toward the ends of the portion 128b.

  The presence of such a recess 128c substantially widens the air gap between the stator and the field element, and reduces the flux linkage at the position of the recess 128c. As described above, if the concave portion 128c is provided at a position where the magnetic pole surface 126i is 1/3 of the angle extending in the circumferential direction when viewed from the central axis 91, the third harmonic can be reduced.

  FIG. 10 is a graph showing the effect of the deformation of the field element according to the present embodiment. The horizontal axis represents the mechanical angle in degrees and the vertical axis represents the cogging torque using arbitrary units. ing.

  Graph L1 does not have a magnetic plate 128, Graph L2 has an arc-shaped magnetic plate 128 in plan view, and Graph L3 has a magnetic plate 128 having a recess 128c as in this modification. Respectively.

  As is clear from the comparison of the graphs L1, L2, and L3, it is understood that the cogging torque, particularly the triple component of the fundamental wave, is reduced by providing the magnetic plate 128 and further providing the recess 128c. Is done.

  FIG. 11 is a graph showing the effect of the deformation of the field element according to this embodiment. The horizontal axis represents the rotational order and the vertical axis represents the arbitrary unit of the cogging torque. ing. Here, the rotation order appears as twice the fundamental wave component. Graph G1 has no magnetic plate 128, Graph G2 has an arc-shaped magnetic plate 128 in plan view, and Graph G3 has a magnetic plate 128 having a recess 128c as in the modification. Respectively.

  In FIG. 11, the cogging torque shows that the triple component of the fundamental wave is greatly reduced, as in FIG. Further, when the magnetic plate 128 is provided, there is a side effect that the sixth-order component (12th order of the rotation order) is larger than when the magnetic plate 128 is not provided. It is shown that the sixth-order component is greatly reduced.

  Thus, by providing the recess 128c, an effect of reducing the cogging torque can be obtained.

  FIG. 12 is a plan view illustrating the configuration of field elements per magnet 126. Here, a configuration in which a non-magnetic material 120 that holds the magnetic material plate 128 from the side opposite to the magnetic pole surface 126i is added to the configuration shown in FIG. FIG. 13 is a cross-sectional view perpendicular to the circumferential direction of the field element at the position where the magnetic plate 128 is present.

  Such a non-magnetic body 120 fixes the magnetic plate 128 in close contact with the magnetic pole surface 126i without affecting the reduction of the cogging torque. Therefore, it is easy to eliminate a gap between the magnetic plate 128 and the magnetic pole surface 126i, which may hinder the success of the magnetic plate 128. Of course, the non-magnetic body 120 is also effective even when the arc-shaped magnetic body 128 having no recess 128c is pressed.

  FIG. 14 is a plan view for explaining the method of manufacturing the field element according to the present embodiment. 15 and 16 are cross-sectional views for explaining a method of manufacturing a field element according to this embodiment. In the manufacturing method, the yoke 124 and the magnetic material plate 128 are positioned in the container 8 in advance, and then the magnet is formed by a bonded magnet. In FIG. 14, the magnetic plate 128 having the concave portion 128 c is exemplified, but an arc-shaped magnetic plate 128 having no concave portion 128 c may be used in this manufacturing method.

  FIG. 14 shows a portion of each magnet to be formed later, FIG. 15 shows a position where the magnetic plate 128 exists, and FIG. 16 shows a position where the magnetic plate 128 does not exist, both in the circumferential direction. A vertical section is shown. In the container 8, the yoke 124 is positioned on the other side in the radial direction with respect to the magnetic body plate 128. An opening 80 is vacant between the container 8 and the yoke 124, from which a fluid bonded magnet material is poured between the magnetic plate 128 and the yoke 124.

  Thereafter, the bonded magnet material is solidified, and the bonded magnet material is magnetized to form a magnet. By manufacturing the field element in this way, the magnet and the magnetic plate 128 can be easily adhered to each other.

  FIG. 17 is a cross-sectional view showing a state where the yoke 124 and the magnetic plate 128 are positioned in the container 8, and shows a cross section in the circumferential direction at a position where the magnetic plate 128 is present.

  The magnetic material plate 128 and the yoke 124 are connected by the nonmagnetic material 81 and then placed in the container 8 and positioned. This makes it easier to put the magnetic plate 128 and the yoke 124 in the container 8 than in the case where the magnetic plate 128 and the yoke 124 are positioned in the container 8.

  The rotary electric machine in which the armature 14 is provided on the inner peripheral side of the field element 12 has been described, but the above description can also be applied to a rotary electric machine in which the armature 14 is provided on the outer peripheral side of the field element 12. However, the following replacement is necessary. That is, “the radial direction 94 side” is read as “the opposite side to the radial direction 94”, and “the opposite side to the radial direction 94” is read as “the radial direction 94 side”.

  In particular, in a rotating electrical machine in which the armature 14 is provided on the outer peripheral side of the field element 12, it is desirable to provide an annular nonmagnetic material 120. This is because the magnetic plates 128 spaced apart from each other can be prevented from being separated from the magnet 126 by the centrifugal force caused by the rotation of the field element.

It is sectional drawing which shows the structure of the outline of the crossflow fan rotated by the rotary electric machine which concerns on embodiment of this invention. It is a perspective view which shows notionally the rotary electric machine concerning embodiment of this invention. It is sectional drawing in position AA shown by FIG. It is the schematic diagram which expands and shows the field element and armature 14 which were seen from the radial direction inner side. It is a figure which shows the cross section of a field element. It is a figure which shows the cross section of a field element. It is sectional drawing which shows a cross section perpendicular | vertical to the circumferential direction of a field element. It is a top view which illustrates the structure of a deformation | transformation of the field element concerning this embodiment. It is a top view which illustrates the composition of the field element per magnet. It is a graph which shows the effect of the said deformation | transformation of the field element concerning this Embodiment. It is a graph which shows the effect of the said deformation | transformation of the field element concerning this Embodiment. It is a top view which illustrates the composition of the field element per magnet. It is sectional drawing perpendicular | vertical to the circumferential direction of a field element in the position where a magnetic body plate exists. It is a top view explaining the manufacturing method of the field element concerning this Embodiment. It is sectional drawing explaining the manufacturing method of the field element concerning this Embodiment. It is sectional drawing explaining the manufacturing method of the field element concerning this Embodiment. It is sectional drawing which shows a mode that the yoke and the magnetic body board 128 were positioned with the container. It is a perspective view which shows the structure of the principal part of a rotary electric machine partially. It is a schematic diagram which expands and shows a rotor magnet and a stator core partially. It is a schematic diagram which shows partially a rotor magnet, a yoke, a stator core, and a coil seen from the circumferential direction.

Explanation of symbols

91 Central axis 92 direction 93 circumferential direction 94 radial direction 12 field element 14 armature 81, 120 non-magnetic material 124 yoke 126 magnet 126i, 126h magnetic pole surface 126d, 126u end surface 128 magnetic material plate 128c recess 142 teeth 1242 portion 1261 groove

Claims (11)

A magnet (126) disposed around the central axis (91) along a circumferential direction (93) and having a first magnetic pole surface (126i) on one side in the radial direction (94) of the ring; ,
A magnetic plate (128) covering the first magnetic pole face while exposing at least a part of the first magnetic pole face in a direction (92) along the central axis,
A pair of the magnetic plates that respectively cover the first magnetic pole surfaces of the magnets adjacent to each other are spaced apart from each other.   The field element according to claim 1, wherein the magnet (126) is provided with a groove (1261) into which the magnetic plate (128) is fitted.   The one side of the magnetic plate (128) is provided with a pair of recesses (128c) that open toward the one side and extend in the direction (92) along the central axis. The field element described. Annular non-magnetic material (120) for pressing the magnetic plate from the one side
The field element according to claim 2, further comprising: The magnet (126) has a second magnetic pole surface (126h) on the other side in the radial direction (94),
The field element according to any one of claims 1 to 4, further comprising a yoke (124) provided between the second magnetic pole faces of the magnets (126) adjacent to each other. The yoke (124) covers the end face (126u) in the direction (92) of the magnet (126),
The field element according to claim 5, wherein a portion (1242) of the yoke that covers the end surface of the magnet is retracted to the other side with respect to the first magnetic pole surface (126i).   The field element according to claim 6, wherein the portion (1242) of the yoke (124) is retreated to at least the vicinity of the center of the end face (126u) of the magnet (126) in the radial direction (94). A field element (12) according to any one of claims 1 to 7;
A rotating electric machine comprising: an armature (14) provided on the magnetic plate (128) side with respect to the field element. The armature (14) has teeth (142) facing the magnetic plate (128),
The rotating electrical machine according to claim 8, wherein the teeth are smaller than the magnet (126) in the direction (92) along the central axis (91). A method for manufacturing a field element (12) according to claim 1, comprising:
Positioning the magnetic plate (128) and an annular yoke (124) on the other side in the radial direction (94) from the magnetic plate in the container (8),
Pour a fluid bond magnet material between the magnetic plate and the yoke,
A method of manufacturing a field element, comprising solidifying the bonded magnet material and magnetizing the bonded magnet material to form the magnet (126).   The method of manufacturing a field element according to claim 10, wherein the magnetic plate (128) and the yoke (124) are connected by a non-magnetic body (81) and then placed in the container and positioned.

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