JP2008022664A - Field element and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent demagnetization of magnets. <P>SOLUTION: A magnetic field element 1a can rotate around a rotating shaft 92 along a predetermined direction 91, and has a plurality of magnets 11, magnetic plates 21, and joints 3. The magnets 11 are disposed in an annular state around the rotating shaft 92 along a circumferential direction 93 and separated to each other. Each magnet 11 has the first and second pole surfaces 11a, 11b which provide different poles to each other in the predetermined direction 91. Each of the pole surfaces 11a, 11b which are positioned on the same side in the predetermined direction 91 of each adjacent magnet 11 in the circumferential direction 93 has different poles to each other. Each magnetic plate 21 is provided with one adjacent magnet 11 in the circumferential direction 93, and provided on different side from each other relative to the magnet 11 in the predetermined direction 91. The joint 3 is made of non-magnetic material, and is jointed to the magnetic fields 2 which are composed of the magnets 11 and the magnetic plates 21 provided at the magnets 11 with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a field element and a rotating electric machine, and can be applied to an axial gap type rotating electric machine.

  An axial gap type rotating electric machine is desirable in that it includes a field element and an armature, and can be reduced in thickness and can be improved in torque density by increasing the magnetic pole area.

  In an axial gap type rotating electric machine, a thrust force is generated. For example, two field elements are provided on opposite sides of one armature, or two armatures are connected to one field element. The thrust force generated in the rotating electrical machine can be counteracted by being provided on the opposite side.

  In particular, it is desirable to provide two armatures for one field element. This is because the wind loss can be reduced because there is only one field element.

  In Patent Document 1 and Patent Document 2, a rotating electric machine in which two armatures are provided for one field element is introduced. In Patent Document 1, the field element has a plurality of magnets having two magnetic pole faces having different polarities, one of the magnetic pole faces opposite to one of the armatures, and the other of the magnetic pole faces is an armature. Opposite the other. In Patent Document 2, the field element is provided with magnets on each of an end face facing one of the armatures and an end face facing the other armature. In addition, Patent Document 3 shows a technique related to the present invention.

JP 2001-136721 A JP 2005-295757 A JP 2005-143276 A

  In any of the rotating electric machines described in Patent Document 1 and Patent Document 2, the magnet facing the armature is exposed in the gap between the armature and the field element. For this reason, these magnets are easily affected by a demagnetizing field, and the magnets may be demagnetized.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent demagnetization of a magnet.

  The field element according to the first aspect of the present invention is arranged around the rotation axis (92) along the predetermined direction (91) in an annular shape along the circumferential direction (93) and spaced apart from each other. A plurality of magnets (11) having first and second magnetic pole faces (11a, 11b) exhibiting different polarities in the predetermined direction, and the first and second magnetic pole faces for any of the magnets. Each of the magnets adjacent to each other in the circumferential direction (93), and the magnetic pole surface (11a) on the same side in the predetermined direction (91). 11b) have different polarities, and the magnetic plates provided on the magnets adjacent to each other in the circumferential direction are provided on different sides of the magnet in the predetermined direction.

  A field element according to a second aspect of the present invention is the field element according to the first aspect, wherein the field is constituted by the magnet (11) and the magnetic plate (21) provided with the magnet. Of the end faces (2a, 2b) in the predetermined direction (91) of the magnetic part (2), the end face (2a) on the magnet side is directed to the magnetic plate side belonging to the same field part. Retreating with respect to the end face (2b) on the magnetic plate side of the field part adjacent to the field part along the circumferential direction (93).

  A field element according to a third aspect of the present invention is the field element according to the first or second aspect, wherein the magnet (11) and the magnetic plate (21) on which the magnet is provided. Of the end surfaces (2a, 2b) in the predetermined direction (91) of the configured field portion (2), the area (Sm) of the end surface (2a) on the magnet side is the circumferential direction (93). Is larger than the area (Sj) of the end face (2b) on the magnetic plate side of the field portion adjacent along the line.

  A field element according to a fourth aspect of the present invention is the field element according to any one of the first to third aspects, wherein the magnetic plate (21) comprises a dust core.

  A field element according to a fifth aspect of the present invention is the field element according to any one of the first to third aspects, wherein the magnetic plate (21) comprises a wound core.

  A field element according to a sixth aspect of the present invention is the field element according to any one of the first to fifth aspects, comprising a nonmagnetic material, the magnet (11), and the magnet Further comprising a connecting portion (3) for connecting the magnetic field portions (2) composed of the magnetic plate (21) provided with the magnetic field plate (21).

  A field element according to a seventh aspect of the present invention is the field element according to the sixth aspect, wherein the connecting portion (3) is made of a nonmagnetic metal.

  A field element according to an eighth aspect of the present invention is the field element according to any one of the first to fifth aspects, wherein the field element is made of a magnetic material and is adjacent along the circumferential direction (93). The magnetic plate (21) is further provided with a connecting portion (31) for connecting the magnetic plates (21) to each other.

  A field element according to a ninth aspect of the present invention is the field element according to the eighth aspect, wherein the connecting portion (31) is formed of a dust core.

  A field element according to a tenth aspect of the present invention is the field element according to any one of the first to fifth aspects, wherein the yoke (32) has an annular shape along the circumferential direction (93). ), And the magnetic plate (21) is provided on the magnetic pole surface (11a, 11b) via the yoke.

  A field element according to an eleventh aspect of the present invention is the field element according to the tenth aspect, wherein the yoke (32) includes a plurality of electromagnetic steel plates stacked in the predetermined direction (91).

  A field element according to a twelfth aspect of the present invention is the field element according to the tenth aspect, wherein the yoke (32) comprises a wound iron core.

  A field element according to a thirteenth aspect of the present invention is the field element according to the tenth or eleventh aspect, wherein the yoke (32) includes the magnetic plate (21) or the magnet (11). There are grooves (41, 42) to be fitted.

  A rotating electric machine according to a fourteenth aspect of the present invention is the field element (1a to 1c) according to any one of the first to thirteenth aspects, and a predetermined direction (91) side of the field element. And two armatures provided from the opposite side.

  A rotating electric machine according to a fifteenth aspect of the present invention is the rotating electric machine according to the fourteenth aspect, wherein the magnet (11) and the magnetic body plate (21) adjacent to each other along the circumferential direction (93). Is at least twice the distance between the field element and the armature.

  According to the field element of the first aspect of the present invention, by providing a magnetic body plate on the magnetic pole surface of the magnet, it is difficult to be affected by a demagnetizing field from the side on which the magnetic body plate is provided. Can be prevented. In addition, the surface of the magnetic plate opposite to the magnet is magnetized to the same polarity. Therefore, the magnetic flux is not short-circuited between the magnetic plates.

  According to the field element according to claim 2 of the present invention, in the rotating electric machine provided with the armature so as to face the end surface of the field part, the distance of the magnet located on the armature side from the armature is Since it becomes long, it becomes difficult to be demagnetized by the magnetic field generated by the armature.

  According to the field element of claim 3 of the present invention, when an armature is provided for the field element, the attractive force generated on the magnet side end face of the field part and the field part The attractive force generated on the end face of the magnetic field plate side of the field portion adjacent along the direction can be made equal.

  According to the field element of claim 4 of the present invention, eddy current loss generated in the magnetic plate can be reduced.

  According to the field element of claim 5 of the present invention, eddy current loss generated in the magnetic plate can be reduced.

  According to the field element of claim 6 of the present invention, since the field part is connected by the connection part made of a non-magnetic material, the magnetic flux is short-circuited between the field parts adjacent in the circumferential direction. Hateful.

  According to the field element of claim 7 of the present invention, the strength of the connecting portion is high.

  According to the field element of the eighth aspect of the present invention, it is easy to arrange the magnetic plates in an annular shape along the circumferential direction. In addition, the magnetic plate and the connecting portion can be integrally formed.

  According to the field element of claim 9 of the present invention, the eddy current loss generated at the connecting portion is small.

  According to the field element of the tenth aspect of the present invention, it is easy to arrange the magnetic plates in an annular shape along the circumferential direction. In addition, the magnetic plate and the yoke can be integrally formed.

  According to the field element of the eleventh aspect of the present invention, the eddy current loss generated in the yoke is small.

  According to the field element of the twelfth aspect of the present invention, the eddy current loss generated in the yoke is small.

  According to the field element of the thirteenth aspect of the present invention, the magnetic plate or the magnet can be easily fixed to the yoke.

  According to the motor of the fourteenth aspect of the present invention, the motor efficiency is high.

  According to the motor of the fifteenth aspect of the present invention, it is difficult for the magnetic flux to be short-circuited between the magnet and the magnetic plate in the field element.

First embodiment.
FIG. 1 conceptually shows a field element 1a according to the present embodiment. The field element 1 a is rotatable around a rotation shaft 92 along a predetermined direction 91, and includes a plurality of magnets 11, a magnetic body plate 21, and a connecting portion 3. In FIG. 1, the magnet 11, the magnetic material plate 21, and the connecting portion 3 are shown shifted along the rotation shaft 92.

  The magnets 11 are arranged around the rotating shaft 92 in an annular shape along the circumferential direction 93 and spaced apart from each other. Each of the magnets 11 has first and second magnetic pole surfaces 11 a and 11 b that have different polarities in a predetermined direction 91. For example, the first magnetic pole surface 11a has an N pole, and the second magnetic pole surface 11b has an S pole.

  The magnetic pole surfaces 11a and 11b on the same side in the predetermined direction 91 of the magnets 11 adjacent to each other along the circumferential direction 93 have different polarities. That is, on the same side in the predetermined direction 91, one of the magnets 11 has the first magnetic pole surface 11a and the other has the second magnetic pole surface 11b.

  In each of the magnets 11, the magnetic plate 21 is provided only on one of the first and second magnetic pole surfaces 11a and 11b. Specifically, the magnetic plates 21 provided for each of the magnets 11 adjacent along the circumferential direction 93 are provided on different sides of the magnet 11 in the predetermined direction 91. That is, for one of the magnets 11, the magnetic plate 21 is provided on the predetermined direction 91 side, and for the other of the magnets 11, the magnetic plate 21 is provided on the side opposite to the predetermined direction 91.

  The above-described content will be described more specifically. One of the magnets 11 adjacent along the circumferential direction 93 exhibits an N pole on the magnetic pole surface 11a (11b) on the predetermined direction 91 side, and a magnetic substance is formed on the magnetic pole surface. A plate 21 is provided. The other of the magnets 11 has an N pole on the magnetic pole surface 11a (11b) opposite to the predetermined direction 91, and the magnetic plate 2 is provided on the magnetic pole surface.

  The magnetic plate 21 is provided apart from the magnet 11 adjacent to the magnet 11 provided with the magnetic plate 21 along the circumferential direction 93. This is to prevent the magnetic flux from being short-circuited between the magnet 11 and the magnetic plate 21 adjacent along the circumferential direction 93.

  The connecting portion 3 is made of a non-magnetic material, and connects the field portions 2 including the magnet 11 and the magnetic plate 21 provided on the magnet 11. Since the material of the connecting portion 3 is a non-magnetic material, the magnetic flux is not easily short-circuited between the adjacent field portions 2 in the circumferential direction 93.

  The material of the connecting portion 3 may be a nonmagnetic metal or a nonmagnetic nonmetal. In the former case, the mechanical strength of the connecting portion 3 is increased. On the other hand, in the latter case, no eddy current loss occurs at the connecting portion 3.

  According to the field element 1a, by providing the magnetic body plate 21 on the magnetic pole surfaces 11a and 11b of the magnet 11, it is difficult to be affected by the demagnetizing field from the side on which the magnetic body plate 21 is provided. 11 demagnetization can be prevented. In addition, since the magnetic plates 21 are all magnetized with the same polarity, the magnetic flux is not short-circuited between the magnetic plates 21.

  2 and 3 show the positional relationship in the predetermined direction 91 between the field part 2 and the field part 2 adjacent to the field part 2 in the circumferential direction 93. 2 and 3 show the field element 1a viewed from the outer peripheral side along the circumferential direction 93. FIG.

  In FIG. 2, the positions of the end faces 2 a and 2 b of the field part 2 in the predetermined direction 91 are the same as the positions of the end faces 2 b and 2 a of the field part 2 adjacent to the field part 2 in the circumferential direction 93. . In addition, the code | symbol 2a is attached | subjected to the end surface by the side of the magnet 11 of the field part 2, and the code | symbol 2b is attached | subjected to the end surface by the side of the magnetic material board 21. FIG.

  In FIG. 3, the end face 2 a of the field part 2 is directed to the end face 2 b of the field part 2 adjacent to the field part 2 along the circumferential direction 93 toward the magnetic plate 21 side belonging to the same field part 2. I have retreated. According to such a shape, in the rotating electrical machine in which the armature is provided facing the end faces 2a and 2b of the field part 2, the distance from the armature of the magnet 11 located on the armature side is increased. The magnet 11 is less likely to be demagnetized by the magnetic field generated by the child. For example, the distance between the magnet 11 and the armature can be about 1.5 times the distance between the magnetic plate 21 and the armature.

  In any of the above-described aspects, it is desirable that the magnetic plate 21 is a dust core in that eddy current loss generated in the magnetic plate 21 can be reduced.

  A wound iron core may be employed for the magnetic plate 21, and in such a case, eddy current loss can be reduced. In this case, the wound core is preferably wound around an axis along a predetermined direction 91. This is because most of the magnetic flux in the magnetic plate 21 flows in the predetermined direction 91. In addition, although distortion is easy to generate | occur | produce in a wound iron core, the said distortion is removed by annealing.

Second embodiment.
FIG. 4 conceptually shows the field element 1b according to the present embodiment. The field element 1 b includes a magnet 11, a magnetic body plate 21, and a connecting portion 31. The magnet 11 and the magnetic body plate 21 are configured in the same manner as in the first embodiment.

  The connecting portion 31 is made of a magnetic body and connects adjacent magnetic plates 21 along the circumferential direction 93. For example, a dust core can be used for the connecting portion 31. In this case, eddy current loss generated in the connecting portion 31 is reduced.

  According to the above-described field element 1b, it is easy to arrange the magnetic material plate 21 in an annular shape along the circumferential direction 93. In addition, the magnetic plate 21 and the connecting portion 32 can be integrally formed.

Third embodiment.
FIG. 5 conceptually shows the field element 1c according to the present embodiment. The field element 1 c includes a magnet 11, a magnetic plate 21, and a yoke 32. The yoke 32 has an annular shape along the circumferential direction 93. The magnetic plate 21 is provided on the magnetic pole surfaces 11 a and 11 b via the yoke 32. Other configurations are the same as those of the first embodiment.

  The yoke 32 may be a laminate of electromagnetic steel plates or a wound iron core. When the former is adopted, it is desirable that the electromagnetic steel plates are laminated in a predetermined direction 91 in that the eddy current loss generated in the yoke 32 can be reduced. When the latter is adopted, it is desirable that the wound iron core is wound around the axis along the predetermined direction 91 in that the eddy current loss generated in the yoke 32 can be reduced.

  According to the above-described field element 1c, it is easy to arrange the magnetic plate 21 in a ring shape along the circumferential direction 93. In addition, the magnetic plate 21 and the yoke 32 can be integrally formed.

  When the magnetic plate 21 and the yoke 32 are formed integrally, it is desirable to use a dust core for the yoke 32 and the magnetic plate 32. This is because molding becomes easy. In addition, eddy current loss caused by the magnetic plate 21 and the yoke 32 can be reduced.

  The yoke 32 may be provided with a groove for fitting the magnetic plate 31 or the magnet 11. FIG. 6 conceptually shows the shape of the yoke 32 provided with the groove when viewed from the outer peripheral side along the circumferential direction 93.

  The yoke 32 shown in FIG. 6 has grooves 41 and 42 into which the magnetic plate 21 and the magnet 11 are fitted. The magnetic plate 21 and the magnet 11 fitted in each of the grooves 41 and 42 are indicated by broken lines in FIG.

  According to this aspect, the magnetic plate 21 and the magnet 11 can be easily fixed to the yoke 32. Note that only one of the grooves 41 and 42 may be provided in the yoke 32. Further, if the outer diameter of the yoke 32 is made larger than the outer diameters of the magnetic plate 21 and the magnet 11 and the yoke 32 is brought into contact with the outer peripheral sides of the magnetic plate 21 and the magnet 11, the magnetic plate 21. In addition, it is possible to prevent the magnet 11 from being displaced from a predetermined position by the centrifugal force and further from being detached from the yoke 32. For example, the yoke 32 may abut only a predetermined length in the predetermined direction 91 on the outer peripheral side of the magnetic body plate 21 and the magnet 11.

  For example, the grooves 41 and 42 may penetrate the yoke 32 in the predetermined direction 91. In this case, it is desirable to provide a positioning portion such as a step on the inner walls of the grooves 41 and 42 so that the magnetic plate 21 and the magnet 11 do not fit too much into the grooves 41 and 42.

  FIG. 7 shows that in the field element 1c, the length w1 of the magnet 11 belonging to a certain field portion 2 in the circumferential direction 93 is a magnetic body belonging to the field portion 2 adjacent to the field portion 2 in the circumferential direction 93. The case where it is larger than the length w2 about the circumferential direction 93 of the board 21 is shown. FIG. 7 shows a shape of the field element 1 c as viewed from the outer peripheral side along the circumferential direction 93.

  The contents described above can be grasped as follows. That is, the area Sm of the end surface 2 a on the magnet 11 side of the end surfaces 2 a and 2 b in the predetermined direction 91 of the field portion 2 is the magnetic field plate 21 side of the field portion 2 adjacent in the circumferential direction 93. It is larger than the area Sj of the end face 2b.

  According to this aspect, when an armature is provided for the field element 1 c, the attractive force Fm generated on the end surface 2 a on the magnet 11 side of the field part 2 and the field part 2 along the circumferential direction 93. Thus, the attractive force Fj generated on the end face 2b of the adjacent field portion 2 on the magnetic plate 21 side can be made equal. Such a mode can also be applied to the above-described field elements 1a and 1b.

  Hereinafter, the relationship between the area Sm and the area Sj when the suction force Fm and the suction force Fj are equal will be described.

  The attractive force Fj acting on the magnetic plate 21 is represented by the formula (1). Here, the symbol φ represents an effective magnetic flux that passes through the magnetic plate 21 and the magnet 11.

  The attractive force Fm acting on the magnet 11 is expressed by the equation (2). Here, the symbol φm represents the difference between the magnetic flux actually flowing in the magnet 11 and the effective magnetic flux φ, that is, the magnetic field generated from the magnetic pole surfaces 11a and 11b of the magnet 11 and the field portion 2 adjacent in the circumferential direction 93. This is the amount of magnetic flux leaking to the magnetic plate 21 to which it belongs.

  When Expression (1) and Expression (2) are substituted into Fj = Fm and solved for the ratio Sm / Sj of the area Sm to the area Sj, Expression (3) is obtained.

  Therefore, when the area Sj and the area Sm satisfy the relationship of the expression (3), the attractive forces Fj and Fm generated in the field elements 1a to 1c are equal in the circumferential direction 93.

  For any of the field elements 1a to 1c described above, a rotating electric machine can be obtained by providing armatures on the field elements 1a to 1c from the predetermined direction 91 side and the opposite side. Such a rotating electric machine has high efficiency.

  In such a rotating electrical machine, the distance between the magnet 11 and the magnetic plate 21 adjacent along the circumferential direction 93 is at least twice the distance between the field elements 1a to 1c and the armature. desirable. This is because it is possible to efficiently prevent the magnetic flux from being short-circuited between the magnet 11 and the magnetic plate 21.

  A gap between the magnet 11 and the magnetic plate 21 adjacent along the circumferential direction 93 extends from the inner peripheral side to the outer peripheral side of the field elements 1a to 1c. The extending direction of the gap may be inclined with respect to the radial direction centering on the rotation shaft 92. In this case, since skew is provided in the field elements 1a to 1c, cogging torque in the rotating electric machine and torque pulsation during operation can be reduced.

  From the viewpoint of reducing cogging torque and torque pulsation, the positions of the magnetic plate 21 and the magnet 11 may be shifted by a predetermined angle around the rotation shaft 92.

  In any of the above-described embodiments, the field elements 1a to 1c can be fastened to the shaft using the connecting portions 3, 31 or the yoke 32. At this time, it is desirable that the connecting portions 3, 31 and the yoke 32 protrude along the rotation shaft 91 around the shaft. This is because the contact area between the connecting portions 3 and 31 and the yoke 32 and the shaft is increased, and the fastening between the connecting portions 3 and 31 and the yoke 32 and the shaft is strengthened.

  Since the connecting portion 31 and the yoke 32 are made of a magnetic material, when a magnetic material is used for the shaft, if the connecting portion 31 or the yoke 32 is fastened to the shaft, the magnetic flux may be short-circuited from the shaft through the housing and the armature. There is. When such a short circuit occurs, not only the effective magnetic flux amount is reduced, but also an attractive force is generated in the bearing, and the bearing loss is increased.

  Therefore, when the coupling portion 31 and the yoke 32 are fastened to the shaft, it is desirable to employ a non-magnetic material as the shaft material. This is because the magnetic flux can be prevented from being short-circuited from the shaft through the housing and the armature.

It is a perspective view which shows notionally the field element 1a demonstrated by 1st Embodiment. It is a figure which shows the positional relationship of the field part 2 adjacent along the circumferential direction 93. FIG. It is a figure which shows the positional relationship of the field part 2 adjacent along the circumferential direction 93. FIG. It is a perspective view which shows notionally the field element 1b demonstrated by 2nd Embodiment. It is a perspective view which shows notionally the field element 1c demonstrated by 3rd Embodiment. It is a figure which shows notionally the yoke 32 which provided the groove | channels 41 and 42. FIG. It is a figure which shows the field element 1c which provided the magnet and magnetic body board from which an area differs, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a-1c Field element 2 Field part 2a, 2b End surface 3,31 Connection part 11 Magnet 11a, 11b Magnetic pole surface 21 Magnetic body board 32 Yoke 91 Predetermined direction 92 Rotating shaft 93 Circumferential direction Sm, Sj Area

Claims (15)

The first and the second are arranged around the rotation axis (92) along the predetermined direction (91) in an annular manner along the circumferential direction (93) and spaced apart from each other, both of which have different polarities in the predetermined direction. A plurality of magnets (11) having second magnetic pole faces (11a, 11b);
Any of the magnets includes a magnetic plate (21) provided on either one of the first and second magnetic pole faces,
The magnetic pole faces (11a, 11b) on the same side in the predetermined direction (91) of the magnets adjacent to each other along the circumferential direction (93) have different polarities,
The magnetic plates provided in each of the magnets adjacent to each other in the circumferential direction are provided on different sides in the predetermined direction with respect to the magnet.
Field element.   Of the end faces (2a, 2b) in the predetermined direction (91) of the field part (2) composed of the magnet (11) and the magnetic plate (21) on which the magnet is provided, The end face (2a) on the magnet side is adjacent to the magnetic field plate belonging to the same magnetic field part, and is adjacent to the magnetic field part along the circumferential direction (93). 2. The field element according to claim 1, wherein the field element retracts with respect to the end face (2b) on the side.   Of the end faces (2a, 2b) in the predetermined direction (91) of the field part (2) composed of the magnet (11) and the magnetic plate (21) on which the magnet is provided, The area (Sm) of the end surface (2a) on the magnet side is larger than the area (Sj) of the end surface (2b) on the magnetic plate side of the field portion adjacent in the circumferential direction (93). The field element according to claim 1 or 2.   The field element according to any one of claims 1 to 3, wherein the magnetic plate (21) comprises a dust core.   The field element according to any one of claims 1 to 3, wherein the magnetic plate (21) comprises a wound iron core.   It is made of a non-magnetic material, and further includes a connecting portion (3) that connects field portions (2) that are composed of the magnet (11) and the magnetic plate (21) provided with the magnet. The field element according to any one of claims 1 to 5.   The field element according to claim 6, wherein the connecting portion is made of a nonmagnetic metal.   6. The apparatus according to claim 1, further comprising a connecting portion (31) made of a magnetic body and connecting the magnetic plates (21) adjacent to each other along the circumferential direction (93). The field element described.   The field element according to claim 8, wherein the connecting portion is made of a dust core. A yoke (32) having an annular shape along the circumferential direction (93);
The field element according to any one of claims 1 to 5, wherein the magnetic plate (21) is provided on the magnetic pole surface (11a, 11b) via the yoke.   The field element according to claim 10, wherein the yoke (32) has a plurality of electromagnetic steel plates stacked in the predetermined direction (91).   11. A field element according to claim 10, wherein the yoke (32) comprises a wound core.   The field element according to claim 10 or 11, wherein the yoke (32) has grooves (41, 42) into which the magnetic plate (21) or the magnet (11) is fitted. The field element (1a to 1c) according to any one of claims 1 to 13,
A rotating electric machine comprising the field element having two armatures provided from a predetermined direction (91) side and an opposite side thereof. The distance between the magnet (11) adjacent to the circumferential direction (93) and the magnetic plate (21) is at least twice the distance between the field element and the armature. The rotating electrical machine according to claim 14.

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