JP2009148084A - Armature - Google Patents

Abstract

In an armature in which a first winding is wound around one tooth and a second winding is wound with the first winding as a base, the collapse of the second winding is prevented. To provide armature.
At least one layer of a predetermined conductive wire is wound around a main body portion 11 of a tooth 1 to form a winding 2. The dummy windings 4 are arranged side by side with the conductors of the layers of the windings 2 at positions around the axis P, at least in a portion other than the portion where the cross point is formed with respect to the main body portion 11. When the winding 2 is tightly wound in an aligned winding over the entire length of the main body 11 while satisfying a predetermined number of turns, the conductive wire is wound N times over the entire length of the main body 11 in the uppermost layer of the winding 2. If not, the dummy winding 4 can make up for the N turns, so that the winding 2 exists over the entire length of the main body 11 in the uppermost layer of the winding 2.
[Selection] Figure 1

Description

  The present invention relates to an armature, and particularly to an armature in which a plurality of windings are wound around one tooth.

  The motor armature may be designed to use a conductor having a large cross-sectional area in the winding specification. If the cross-sectional area of the conducting wire is large, the space factor will decrease due to the winding thickness. Therefore, in order to use a conducting wire with a small cross-sectional area, a plurality of windings belonging to the same phase are connected in parallel to each other. In addition, since it is impossible to connect two windings wound around odd-numbered teeth belonging to the same phase in parallel, two windings are wound around one tooth and these are connected in parallel. There is technology.

  For example, in the techniques described in Patent Documents 1 to 3, two windings are wound around one tooth, and these are connected in parallel to each other.

  Patent Document 4 is disclosed as a technique related to the present invention.

JP 2006-254524 A JP 2004-208464 A Japanese Patent Laid-Open No. 11-27886 JP 2006-115565 A

  As a mode in which a plurality of windings are wound around the first one tooth of the armature according to the present invention and these are connected in parallel to each other, the first winding is wound over the entire length of one tooth, There is an embodiment in which the first winding is used as a base, the second winding is wound around the first winding, and the first and second windings are connected in parallel to each other.

  In this case, when the second winding is wound, if the uppermost layer of the first winding is not wound over the entire length of the tooth 1, the winding is performed when the second winding is wound. There was a possibility of collapse.

  Accordingly, the present invention provides an armature in which a first winding is wound around one tooth, and a second winding is wound around the first winding as a base. An armature that prevents collapse is provided.

  A first aspect of the armature according to the present invention includes a magnetic body (1) extending along a first direction (D1) parallel to a predetermined axis (P), and a conductor, and the conductor is A first winding (2) wound around the magnetic body around the shaft, and a second winding wound around the first winding from the opposite side of the magnetic body around the shaft. And at least a position in the circumferential direction with respect to the line (3) and the axis, at least at a position other than a portion where a cross point is formed by the conducting wire, and arranged in the same layer as the conducting wire relative to the magnetic body One or more dummy members (4).

  A second aspect of the armature according to the present invention is the armature according to the first aspect, wherein the conductor has a circular cross section, and the dummy member (4) has a cross section with the conductor. The contact portion has the same curvature as the curvature of the cross section of the conducting wire.

  A third aspect of the armature according to the present invention is the armature according to the first or second aspect, wherein the dummy member (4) is a position in a circumferential direction with respect to the shaft, and the conductor is crossed. It is provided avoiding the position where the point is formed and wound.

  The 4th aspect of the armature which concerns on this invention is an armature which concerns on the 1st or 2nd aspect, Comprising: The said conducting wire which belongs to the same layer in the said 1st direction (D1), and is located in the end of the said layer Any one of the conductors excluding one turn of the conducting wire at the beginning of winding of the first winding and one turn of the conducting wire at the end of winding, and the dummy member (4) in the first direction. Adjacent to each other.

  A fifth aspect of the armature according to the present invention is the armature according to any one of the first to fourth aspects, wherein the dummy member (4) is a conducting wire having the same cross-sectional shape as the conducting wire.

  A sixth aspect of the armature according to the present invention is the armature according to the fifth aspect, wherein both ends of the dummy member (4) are open or insulated from each other.

  A seventh aspect of the armature according to the present invention is the armature according to any one of the first to fourth aspects, wherein the dummy member (4) is made of an insulating material.

  An eighth aspect of the armature according to the present invention is the armature according to any one of the first to fourth aspects, wherein the one dummy member (4) is arranged in the first direction (D1). It is adjacent to the conducting wire belonging to the same layer and located at the end of the layer or the conducting wire closest to the magnetic body (1), and interposed between the magnetic body and the first winding (2) The insulating member (6) is further provided, and the insulating member is formed integrally with the one dummy member.

  A ninth aspect of the armature according to the present invention is the armature according to any one of the first to eighth aspects, wherein the first winding (2) and the second winding (3) They are connected in parallel to each other, and the number of turns of the first winding is the same as the number of turns of the second winding.

  According to the first aspect of the armature according to the present invention, by providing a dummy member according to the number of turns of the first winding, the conductor is densely wound from the side close to the magnetic body. A conducting wire is wound over the entire length of the magnetic body in the uppermost layer of the winding. Therefore, in the uppermost layer of the first winding, which is the foundation for winding the second winding, the conductor exists over the entire length of the magnetic body, so that the winding collapse of the second winding is suppressed. it can.

  According to the second aspect of the armature according to the present invention, the first winding can be wound by stacking, and the space factor can be improved.

  According to the third aspect of the armature according to the present invention, since the dummy member is not provided at the cross point, the first winding belonging to the same layer and the dummy member can be prevented from crossing, and the space factor is increased. Can be prevented.

  According to the fourth aspect of the armature according to the present invention, even if the dummy member extends to the portion where the cross point is formed, the lead wire and the lead wire at the start and end of winding straddle the dummy member. Can be prevented from crossing, and a decrease in the space factor can be suppressed.

  According to the fifth aspect of the armature according to the present invention, by using the conducting wire having the same cross-sectional shape as the first winding, the conducting wire used for the first winding can be diverted, and the manufacturing cost can be reduced. .

  According to the sixth aspect of the armature according to the present invention, it is possible to prevent the eddy current of the dummy member caused by the current flowing through the first winding.

  According to the seventh aspect of the armature according to the present invention, it is possible to prevent the eddy current of the dummy member caused by the current flowing through the first winding.

  According to the 8th aspect of the armature which concerns on this invention, the extension part with which an insulating member is provided fulfill | performs the same function as a dummy member. Since one of the dummy members and the insulating member can be integrally formed, the manufacturing cost can be reduced.

  According to the ninth aspect of the armature of the present invention, it is possible to prevent the return current from flowing.

First embodiment.
FIG. 1 is a conceptual perspective view showing an example of a part of the armature according to the first embodiment. The armature includes a tooth 1, windings 2 and 3, and a dummy winding 4. A pair of teeth 1, windings 2, 3, and dummy winding 4 is shown separately for a predetermined axis P. Actually, as will be described later, windings 2, 3, dummy winding 4 Is wound around teeth 1. Although the present armature will be described as an axial gap type armature, the present invention is not limited to this and may be a radial gap type armature.

  The teeth 1 are made of a magnetic material (for example, iron) having a high magnetic permeability, for example, and have a main body portion 11 and a flange portion 12. The main body 11 extends along a direction D1 parallel to a predetermined axis P. The flange 12 is provided at one end of the main body 11 in the direction D1. The flange 12 has a width wider than that of the main body 11 in one direction perpendicular to the axis P.

  The winding 2 is configured by winding a predetermined conducting wire around the axis P around the tooth 1 (more specifically, the main body 11). More specifically, the winding 2 is aligned and wound from the starting point side lead wire 21 (hereinafter also referred to as the starting point 21) to the teeth 1 via an insulator (PET film, insulator, etc., not shown). It is densely wound and drawn out to an end point side lead wire 22 (hereinafter also referred to as an end point 22).

  The winding 3 is formed by winding a predetermined conducting wire around the axis P around the winding 1 from the side opposite to the teeth 1. More specifically, the winding 3 is densely wound around the winding 2 from the start point side lead wire 31 (hereinafter also referred to as the start point 31) in an aligned manner, and the end point side lead wire 32 (hereinafter, the end point 32). Also called). In FIG. 1, the wound armature windings are drawn together in the drawing. However, the lead lines are shown separately.

  The dummy winding 4 is a position in the circumferential direction with respect to the axis P, and at least at a position other than a portion where a cross point (to be described later) is formed, is the same layer as the conducting wire constituting the winding 2 with respect to the tooth 1. Are arranged side by side. The dummy winding 4 is a conducting wire having the same wire diameter as that of the conducting wire constituting the winding 2, for example. The dummy winding 4 will be described in detail later.

  In FIG. 1, one of a set of teeth 1, windings 2 and 3, and dummy winding 4 is illustrated, but actually, a plurality of the sets are annularly arranged around a predetermined rotation axis. ing. Further, a set of teeth 1, windings 2, 3, and dummy winding 4 is fixed to, for example, a back yoke as shown in the drawings to be referred to later. The number of windings to be wound is not limited to two and may be three or more. Here, a mode in which two windings 2 and 3 are wound around one tooth 1 will be mainly described.

  FIG. 2 shows the connection relationship between the windings 2 and 3. The windings 2 and 3 are connected in parallel to each other. For example, the end point 22 of the winding 2 and the start point 31 of the winding 3 are connected to the power supply terminal V, for example. A starting point 21 of the winding 2 and an end point 32 of the winding 3 are connected to a neutral point terminal N, for example.

  FIG. 3 shows an example of a conceptual configuration in the section AA shown in FIG. 1 in a state where the windings 2 and 3 and the dummy winding 4 are wound around the tooth 1. FIG. 3 also shows a back yoke 5 in which a pair of teeth 1, windings 2 and 3, and dummy windings 4 are arranged. In the example shown in FIG. 3, for the sake of simplicity, the main body 11 has a certain length (winding) of the winding 2 such that the first layer winding 2a can be wound, for example, nine times along the direction D1. The length of the wire 2 is approximately the same as the value obtained by multiplying the wire diameter of the conductor 2 by 9).

  When winding the winding 2 on such a tooth 1 with 25 turns, for example, as shown in FIG. The winding was wound 8 turns as the second layer winding 2b and 8 turns as the third layer winding 3a. Therefore, the third layer (uppermost layer) of the winding 2 is not wound over the entire length of the tooth 1 (the entire length of the main body 11 in the direction D1). In addition, the arrow shown overlapping with the conducting wire in FIG. 4 indicates that the winding 2 starts to be wound around the main body 11 from the back yoke 5 side, turns back on the flange 12 side, and the second-layer winding 2b is sequentially turned on. It is shown that the winding is wound up and turned back again on the back yoke 5 side so that the third-layer winding 3c is sequentially wound. The same applies to the arrows that overlap with the conductors in other drawings.

  On the other hand, in this armature, as shown in FIG. 3, the dummy winding 4 is arranged side by side in the first layer winding 2 a of the winding 2. More specifically, the dummy winding 4 is wound around the main body 11 by one turn at the end of the main body 11 on the flange 12 side.

  In manufacturing such an armature, the dummy winding 4 is wound until at least the winding 2b of the second layer starts to be wound. The dummy winding 4 is preferably temporarily fixed to the main body 11 until at least the second layer winding 2b starts to be wound. When the second layer winding 2b is wound, the conductive wire of the second layer winding 2b in contact with the dummy winding 4 is connected to the first layer winding 2a in contact with the dummy winding 4. Since the dummy winding 4 is pressed into the concave portion constituted by the conducting wire, the main body portion 11 and the flange portion 12, the dummy winding 4 is fixed.

  For example, the winding 2 starts to be wound from the end of the main body 11 on the back yoke 5 side, and is wound as a first layer winding 2 a to a position adjacent to the dummy winding 4. In the first-layer winding 2a, the dummy winding 4 is arranged on the winding 2a and wound for one turn, so that the conductive wire is wound for eight turns.

  Subsequently, when winding the winding 2b of the second layer, the conductor starts to be wound to the second layer between the adjacent dummy winding 4 and the conductor of the winding 2a, and the back yoke 5 side It is wound sequentially. Since the second layer winding 2b is wound between the first layer winding 2a adjacent to each other and between the adjacent dummy winding 4 and winding 2a, the first layer winding 2b is wound. The number of windings is one turn less than that of the wire 2a. That is, the second layer winding 2b is wound for eight turns.

  Subsequently, when winding the winding 2c of the third layer, winding starts between the back yoke 5 and the winding 2b of the second layer, and between the adjacent windings 2b in the second layer. Is wound in sequence. Then, the third-layer winding 2c is wound nine times to satisfy the number of windings 25 as the winding 2. Therefore, the third layer winding 2c, which is the uppermost layer, is wound over the entire length of the tooth 1. And since the coil | winding 2c exists over the full length of the teeth 1 in the uppermost layer of the coil | winding 2 used as the foundation at the time of winding the coil | winding 3, the coil | winding 3 is wound around the coil | winding 2. Winding collapse that can occur at the time can be suppressed.

  That is, when the winding 2 is wound around the tooth 1 with a predetermined number of turns, the uppermost layer of the winding 2 exists over the entire length of the tooth 1, so that the uppermost winding has N turns. When there is not enough, N dummy windings 4 are arranged. Thereby, the uppermost layer of the winding 2 can exist over the entire length of the tooth 1.

  The armature as described above is particularly effective when the winding end of the winding 2 is located in an odd-numbered layer. FIG. 3 shows a mode in which the winding end of the winding 2 is located in the third layer. Referring to FIG. 3, the entire length of main body 11 has a length that allows the conducting wire to be wound for nine turns. Therefore, if the dummy winding 4 is not wound, nine conductors can be wound on the first layer of the winding 2, and eight conductors can be wound on the second layer. Nine conductors can be wound on the third layer. That is, when the winding 2 is densely wound around the teeth 1 by the aligned winding, the number of windings of the winding 2 is 26. On the other hand, the first layer of the winding 3 is arranged in the same manner as the second layer of the winding 2, so that eight conductors are provided in the second layer and nine conductors are provided in the second layer. Conductive wires for 8 turns can be wound on the layer. Therefore, when the winding 3 is densely wound around the teeth 1 by aligned winding, the number of windings of the winding 3 is 25.

  As described above, when the winding end of the winding 2 is located in the odd-numbered layer, when the windings 2 and 3 are densely wound over the entire length of the tooth 1, Are different from each other. It is desirable that the numbers of turns of the windings 2 and 3 connected in parallel are matched with each other. This is because a reflux current can be prevented from flowing between the windings 2 and 3. And according to this armature, it can be made to wind over the full length of the teeth 1 in each layer of the coil | winding 2 and 3, making the winding frequency of the coil | winding 2 and 3 correspond by the dummy coil | winding 4. .

  Note that the winding end of the winding 2 may be located in an even-numbered layer. FIG. 5 shows another example of the conceptual configuration in section AA shown in FIG. Compared to the embodiment shown in FIG. 3, the windings 2 and 3 are each wound in four layers.

  As shown in FIG. 5, one dummy winding 4 is arranged side by side on the third layer winding 2c, for example. More specifically, the dummy winding 4 is wound at the end on the flange 12 side in the third layer winding 2c. In such a dummy winding 4, after the first conducting wire of the second layer winding 2 b has been wound, the conducting wire in contact with the dummy winding 4 of the fourth layer winding 2 d is wound. It is wound before it can be started.

  The length of the main body 11 in the direction D1 is assumed to be the same as in FIG. 3, and for example, a case where the number of turns of the windings 2 and 3 is 33 will be described. When the first layer to the fourth layer of the winding 2 are densely wound over the entire length of the tooth 1, the conducting wire can be wound 34 times.

  As shown in FIG. 5, in this armature, one dummy winding 4 is arranged, so that the winding number 2 of the winding 2 is satisfied and the teeth 1 are wound tightly over the entire length of the teeth 1 in each layer. Can turn. Therefore, as shown in FIG. 5, the uppermost layer of the winding 2 has the winding 2 over the entire length of the tooth 1. Thereby, the winding collapse of the winding 3 can be prevented.

  3 and 5, the armature provided with one dummy winding 4 has been described. However, the present invention is not limited to this, and a plurality of armatures may be provided. For example, a case where the number of turns of the windings 2 and 3 is set to 32 and the teeth 1 are wound will be described. FIG. 6 shows another example of the conceptual configuration in the AA cross section shown in FIG. When the number of turns of the windings 2 and 3 is 32, 34 is the number of turns that can be wound when the winding 2 is densely wound up to the fourth layer, and the number of turns actually wound. Since the difference from 32 is 2, two dummy windings 4 are arranged. More specifically, for example, at the end on the flange 12 side, one dummy winding 4a is arranged side by side on the third layer winding 2c, and the other dummy winding 4b is arranged on the fourth layer winding 2d. Are arranged side by side.

  In such a dummy winding 4a, after the first conductive wire of the second layer winding 2b is wound, the conductive wire in contact with the dummy winding 4a of the fourth layer winding 2d is wound. Before being rolled up. In the dummy winding 4b, the dummy winding 4a is wound, and further, the conductive wire adjacent to the dummy winding 4a of the third layer winding 2c is wound, and then the first layer of the winding 3 is wound. Before the first conductor of the winding 3a is wound, it is wound.

  As a result, the uppermost layer of the winding 2 serving as a foundation for winding the winding 3 exists over the entire length of the tooth 1, so that the winding collapse when the winding 3 is wound can be prevented. Two dummy windings 4 may be provided, or one dummy winding 4 may be wound twice.

  Next, the dummy winding 4 (including the dummy windings 4a and 4b, the same applies to the first embodiment below) will be described. For example, if the dummy winding 4 is a conducting wire having the same diameter as the conducting wire constituting the winding 2, there is no need to manufacture a new dummy winding 4, and the conducting wire used in the winding 2 is diverted. be able to. Therefore, the manufacturing cost can be reduced. In this case, it is desirable that both ends of the dummy winding 4 are not in contact with each other (open) (see FIG. 1). Thereby, it is possible to prevent an eddy current from being generated and causing a loss. In order to achieve the same effect, both ends of the dummy winding 4 may be insulated.

  Further, if the dummy winding 4 has the same wire diameter as the conducting wire of the winding 2, the winding 2 can be wound by stacking as shown in FIGS. The space factor can be improved.

  Moreover, the dummy winding 4 may be comprised, for example from the insulator. In this case, the dummy winding 4 may be a linear insulator having both ends spaced apart from each other, or may be a ring-shaped insulator having both ends coupled to each other. In the case of a ring-shaped insulator, for example, using an insulator having a certain degree of contractibility (for example, vinyl chloride), the insulator is attached to the main body 11 so that rubber is wound around the main body 11. May be. Because the dummy winding 4 can be fixedly wound around the tooth 1 due to the contractibility, the jig, process, etc. for temporarily fixing the dummy winding 4 to the tooth 1 can be simplified when manufacturing the armature. Or it can be omitted.

  The dummy winding 4 may be in any layer of the winding 2 and may be arranged side by side with the conductor of any winding 2 in the direction D1, but in view of the space factor, the dummy winding 4 It is desirable that the winding 4 satisfies the conditions described below.

  A case where the dummy winding 4 extends to the surface where the cross point is formed will be described. First, a case where the dummy winding 4 causes a decrease in the space factor will be described, and then a preferable mode will be described.

  FIG. 7 shows a state of the first layer winding on the surface where the cross point is formed. The surface where the cross points are formed is a surface where the windings intersect between different layers. FIG. 7 shows the first round of the first layer winding 2a and the second layer winding 2b.

  In FIG. 7, for example, two dummy windings 4 are arranged between the end of the first layer winding 2a on the back yoke 5 side and between any two of the first layer windings 2a. The aspect which is shown is illustrated. In this case, as shown in FIG. 7, the dummy winding 4 arranged at the end on the back yoke 5 side intersects with the lead line connected to the start point 21 side, so that the space factor is lowered. Further, since the dummy winding 4 disposed between any two of the first-layer windings 2a intersects the first-layer winding 2a adjacent to the dummy winding 4, the space is also increased. The rate drops.

  Therefore, first, the dummy winding 4 has one turn on the starting point 21 side of the winding 2 (on the back yoke 5 side in the first layer winding 2a in FIGS. 3, 5 and 6) and the end point 22 side of the winding 2. 3 is arranged at a position excluding one turn on the flange 12 side of the third layer winding 2c and in FIG. 5 and 6 on the back yoke 5 side of the fourth layer winding 2d. . Thereby, it is possible to prevent the dummy winding 4 and the lead wire from crossing each other. Further, the dummy winding 4 is arranged at any position on both ends of the main body 11 in the odd-numbered layer of the winding 2. Thereby, the winding 2 belonging to the same layer as the dummy winding 4 can be prevented from crossing the dummy winding 4 at the cross point. Therefore, a decrease in the space factor can be suppressed. If the dummy winding 4 is provided at the end of the main body 1 in the odd-numbered layer of the winding 2, the dummy winding is provided at the end of the layer one layer above the layer provided with the dummy winding 4. Line 4 may be provided (see FIG. 6).

  Moreover, the dummy winding 4 may be arranged avoiding the surface on which the cross point is formed. In this case, as shown in FIG. 8, since the winding 2 located in the same layer as the dummy winding 4 does not intersect the dummy winding 4 at the cross point, a decrease in the space factor can be suppressed.

Second embodiment.
FIG. 9 is a conceptual configuration diagram illustrating an example of a partial cross section of the armature according to the second embodiment. Compared with the first embodiment, the armature includes an insulator 6.

  The insulator 6 is, for example, a resin molded product, and is disposed between the windings 2 and 3 and the teeth 1, and the dummy winding 4 is integrally formed. This will be described more specifically.

  The insulator 6 includes an insulating portion 61 provided between the flange portion 12 and the windings 2 and 3, an insulating portion 62 provided between the main body portion 11 and the winding 2, the back yoke 5, the windings 2 and 2. 3 and an insulating portion 64 corresponding to the dummy winding 4.

  The insulating part 64 is provided in any of the insulating parts 61, 62, 63. In FIG. 9, for example, provided at the boundary between the insulating portions 61 and 62, the first layer winding 2 a is arranged side by side with the conductor on the flange portion 12 side. As a result, as in the case described with reference to FIG. 3 in the first embodiment, the conductive wire exists over the entire length of the tooth 1 in the uppermost layer of the winding 2, thereby Winding collapse can be prevented.

  In addition, since the insulator 6 can be manufactured by integrally forming a portion corresponding to the dummy winding 4, the step of arranging the dummy winding 4 can be omitted, and the manufacturing cost can be suppressed.

  The dummy winding 4 described in the first embodiment and the armature according to the second embodiment may be used in combination.

  In the first and second embodiments, an example in which the windings 2 and 3 are wound around one tooth has been described as an example, but the present invention is not limited thereto. Three or more windings may be wound around one tooth. In this case, when the dummy winding 4 (or the insulating portion 64) is arranged in a winding other than the winding most distant from the tooth. Good.

  In addition, the winding form is an air core coil (after winding around the core, then pulling out the core and fitting it into the magnetic body), winding around the bobbin, or directly around the magnetic body subjected to insulation treatment. Any winding method may be used, such as a spindle winding for rotating the workpiece and a nozzle winding for winding the nozzle around a fixed workpiece. Furthermore, it is preferable to use a self-bonding wire which is heated to be fixed after winding or while winding. Moreover, you may mold with resin after winding.

It is a perspective view which shows the concept of an example of a part of armature concerning 1st Embodiment. It is a notional block diagram which shows the connection relation of a coil | winding. It is sectional drawing which shows the notional structure of the AA cross section in FIG. It is sectional drawing which shows the part corresponded to the AA cross section of the armature in the past. It is sectional drawing which shows the part corresponded to the AA cross section of the armature concerning another example. It is sectional drawing which shows the part corresponded to the AA cross section of the armature concerning another example. It is a figure for demonstrating the influence which the position where a dummy winding is distribute | arranged has on a space factor. It is a conceptual side view which shows the aspect by which a dummy winding is arranged avoiding a cross point. It is sectional drawing which shows the part corresponded to the AA cross section of an example of the armature concerning 2nd Embodiment.

Explanation of symbols

1 Teeth 2, 3 Winding 4 Dummy Winding 6 Insulator 64 Insulation

Claims (9)

A magnetic body (1) extending along a first direction (D1) parallel to a predetermined axis (P);
A first winding (2) having a conducting wire, wherein the conducting wire is wound around the magnetic body around the axis;
A second winding (3) wound around the axis from the opposite side of the magnetic body to the first winding;
At least one dummy member arranged in the same layer as the conductor with respect to the magnetic body at a position in the circumferential direction with respect to the axis, at least at a position other than a portion where a cross point by the conductor is formed An armature comprising (4).   The cross section of the said conducting wire has circular shape, The cross section of the said dummy member (4) has the curvature same as the curvature of the said cross section of the said conducting wire in the part which contact | connects the said conducting wire. Armature.   The armature according to claim 1 or 2, wherein the dummy member (4) is provided at a position in a circumferential direction with respect to the shaft and avoiding a position where the conducting wire is wound around forming a cross point.   Of the conducting wires belonging to the same layer and positioned at the end of the layer in the first direction (D1), one turn of the conducting wire at the beginning of winding of the first winding and one winding of the conducting wire at the end of winding The armature according to claim 1 or 2, wherein any one of the conductive wires excluding a minute and the dummy member (4) are provided adjacent to each other in the first direction.   The armature according to any one of claims 1 to 4, wherein the dummy member (4) is a conducting wire having the same cross-sectional shape as the conducting wire.   The armature according to claim 5, wherein both ends of the dummy member are open or insulated from each other.   The armature according to any one of claims 1 to 4, wherein the dummy member (4) is made of an insulating material. The one dummy member (4) is adjacent to the conducting wire that belongs to the same layer in the first direction (D1) and is located at the end of the layer or the conductor closest to the magnetic body (1),
The insulating member (6) interposed between the magnetic body and the first winding (2) is further provided, and the insulating member is formed integrally with the one dummy member. The armature as described in any one of thru | or 4.   The first winding (2) and the second winding (3) are connected in parallel to each other, and the number of turns of the first winding and the number of turns of the second winding are the same. The armature according to any one of claims 1 to 8.

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