JP4869716B2 - Armature, manufacturing method thereof, and DC motor - Google Patents

Description

  The present invention relates to an armature, a manufacturing method thereof, and a DC motor.

Conventionally, in a brushed DC motor, a winding and a commutator are electrically connected. For example, Patent Document 1 describes an example in which a concentrated winding (10) is hooked on a claw portion (9a) of a commutator (segment), and these are coupled and electrically connected.
Japanese Patent Laid-Open No. 2003-299292 (FIG. 1-2) JP 2004-88902 A (Fig. 1-2)

By the way, in patent document 1, the process (operation | movement) for hooking this to the nail | claw part of a commutator after winding is needed separately. Therefore, the number of manufacturing steps is inevitably increased.
Further, when the windings are hooked on the claw portions of the commutator and are coupled to each other, the core around which the winding is wound and the commutator must be spaced apart from each other by a predetermined distance in the axial direction. This is because, for example, a process for connecting the winding and the claw portion of the commutator is smoothly performed. However, since the core and the commutator are separated from each other in the axial direction, the DC motor is forced to increase in size in the same direction.

  On the other hand, for example, Patent Document 2 describes an example in which an annular recess (50a) is formed on the inner peripheral side of the core (10), and a part (40b) of the commutator is immersed in the recess. According to this configuration, for example, the winding winding or the coupling between the winding and the claw portion of the commutator is performed in a state where the commutator is press-fitted in the axial direction with respect to the rotating shaft to a position where the work process is not hindered. Then, if the commutator is further press-fitted in the axial direction, it is estimated that the axial length loss due to the coupling portion between the winding and the claw portion of the commutator can be reduced.

  However, in this case, a step of press-fitting the commutator into the rotating shaft is required after a step of winding the winding in a state where the commutator is press-fitted into the rotating shaft. In other words, the commutator press-fitting process is required at least twice before and after the winding winding process, which necessitates an increase in the number of manufacturing steps. Further, when the commutator is re-pressed, it is presumed that the coupling portion between the winding and the claw portion of the commutator is deformed, and the reliability of the coupling portion is reduced.

  The objective of this invention is providing the armature which can suppress the increase in a manufacturing man-hour, its manufacturing method, and a DC motor.

In order to solve the above problems, the invention according to claim 1 is characterized in that a commutator having a plurality of segments and a claw portion protruding radially outward from an end portion of the segment, a main body portion, and a diameter from the main body portion. An armature comprising: a core having a plurality of tooth portions extending outward in the direction; a winding wound continuously around each of the tooth portions of the core a plurality of times; and a rotating shaft to which the core and the commutator are fixed in the winding, sequentially, while beyond the tooth portion of the adjacent via the connecting wire extending in a circumferential direction, wherein it is wound around each tooth portion, and the position of the claw portion of the commutator, tension The gist of the present invention is to electrically connect the claws of the commutator and the windings by matching the position of the jumper wire extending linearly in the circumferential direction .

According to a second aspect of the present invention, in the armature according to the first aspect , a connecting portion connected to the rotating shaft and a gap portion penetrating in the axial direction are arranged on the inner peripheral side of the core. The claw portion of the commutator and the connecting wire are brought into contact with each other at the gap portion or the axially extended position of the gap portion, and are welded by a jig inserted in the axial direction at the corresponding contact portion. This is the gist.

According to a third aspect of the present invention, in the armature according to the first or second aspect , the winding includes coil end portions located at both axial ends of the teeth portion, and at one axial end of the main body portion. A storage hole for storing one end of the commutator in the axial direction on the side where the claw portion is formed, and the storage hole has a circumferential position at a vertex when viewed from the axial direction and the claw portion. The gist of the present invention is that it is formed in a polygonal shape that coincides with the circumferential position and that at least a part of the claw portion is accommodated.

A fourth aspect of the invention is the armature according to any one of the first to third aspects, wherein the short-circuit member is provided on the end surface on the core side of the commutator and selectively short-circuits the plurality of segments. The claw portion extends from the outer periphery of the short-circuit member.

According to a fifth aspect of the present invention, there is provided a commutator having a plurality of segments and claw portions projecting radially outward from the end portions of the segments, and a body portion and a plurality of teeth portions extending radially outward from the body portion. In the manufacturing method of an armature, comprising a core having a core, a winding wound continuously around each of the tooth portions of the core, and a rotating shaft to which the core is fixed, a crossover is formed in the circumferential direction As described above, the winding wire is wound around each of the tooth portions while passing over the adjacent tooth portions, and then the connecting wire extending linearly in the circumferential direction in the tension state and the position of the claw portion of the commutator The gist is to fix the commutator to the rotating shaft so that the position of the commutator is aligned, and then electrically connect the claw portion of the commutator and the winding.

According to the sixth aspect of the present invention, the commutator having 24 segments and claw portions arranged at equal intervals protruding radially outward from the end portions of the segments, and the segments at intervals of 120 degrees have the same potential. A short-circuit member connected to the one claw portion from the segment having the same potential, a core having a main body portion and eight tooth portions extending radially outward from the main body portion, and a plurality of times on each tooth portion of the core. An armature comprising a continuously wound winding and a rotating shaft to which the core and the commutator are fixed, wherein the winding is sequentially from one circumferential side of an arbitrary tooth portion, It is wound around each of the teeth portions so as to reach the opposite side of the other teeth portion in the circumferential direction while passing over two adjacent teeth portions via a connecting wire extending in the same direction as the circumferential direction. and the position of the claw portion of the child, the circumferential direction under tension By matching the position of the connecting wire extending linearly, and an armature which is electrically connected to the pawl portion and the winding of the commutator, which is disposed on the outer peripheral side of the armature 6 The gist is that it has a pole magnet.

(Function)
According to the first aspect of the present invention, tension is applied to the connecting wire between the tooth portions, so that the connecting wire is held at a predetermined position after the winding is wound. On the other hand, the claw portion of the commutator protrudes radially outward from the end portion of the segment, and the position of the claw portion matches the position of the crossover line extending linearly in the circumferential direction in a tension state. It has been. Therefore, when connecting the windings and the commutator (claw portion), the windings and the commutator are easily connected without a separate holding member.

According to invention of Claim 2 , the insertion direction of the said jig | tool and the penetration direction of the said space | gap part are match | combined, The nail | claw part of the said commutator used as the axial direction extension position of the said space | gap part or the said space | gap part, and the said At the contact portion with the crossover wire, the claw portion and the crossover wire are welded without being obstructed by the crossover wire or the core (connecting portion or the like).

According to the invention described in claim 3 , since the commutator is fixed to the rotating shaft so that at least a part of the claw portion is housed in the housing hole, the armature is reduced in the axial direction. Is done. The storage hole is formed in a polygonal shape in which the circumferential position of the apex coincides with the circumferential position of the claw portion, so that the storage hole is a round hole that can store the claw portion. Thus, the width of the side wall portion of the storage hole between the adjacent claw portions can be increased toward the radially inner side. And if the width of the side wall part of the storage hole between adjacent claw parts is enlarged toward the inner side in the radial direction, a decrease in the cross-sectional area along the radial direction of the side wall part between adjacent claw parts is suppressed. As a result, in a DC motor provided with this armature, the reduction of magnetic flux passing through the armature core is suppressed. Therefore, it is possible to reduce the size of the armature without degrading the performance of the DC motor.

According to invention of Claim 4 , since the said short circuit member and the said nail | claw part are united, the increase in a number of parts can be suppressed .

According to the fifth aspect of the present invention, tension is applied to the connecting wire between the tooth portions, so that the connecting wire is held at a predetermined position after the winding is wound. On the other hand, the claw portion of the commutator protrudes radially outward from the end portion of the segment, and the position of the claw portion matches the position of the crossover line extending linearly in the circumferential direction in a tension state. It has been. Therefore, when connecting the windings and the commutator (claw portion), the windings and the commutator are easily connected without a separate holding member.

According to invention of Claim 6 , since a nail | claw part is arrange | positioned between two teeth parts and a teeth part, a coil | winding (crossover wire) is arrange | positioned more inside, A nail | claw part and a coil | winding It can be made easier to connect.

As described above in detail, the invention described in the claims, can armature and a manufacturing method thereof suppress an increase in the number of manufacturing steps, as well as to provide a DC motor.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a 6-pole 8-slot 24-segment brushed DC motor will be described with reference to the drawings.

  As shown in FIG. 1, the motor 101 of this embodiment includes a stator 102 and an armature (rotor) 103. The stator 102 includes a substantially bottomed cylindrical yoke housing 104 and a plurality (six in this embodiment) of permanent magnets 105 arranged and fixed at equal angular intervals on the inner peripheral surface of the yoke housing 104. Yes. An end frame (not shown) fixed to the yoke housing 104 so as to close the opening holds an anode-side power supply brush 106 and a cathode-side power supply brush 107 connected to an external power source or the like. (See FIG. 2).

  As shown in FIGS. 2 and 3, the armature 103 includes a metal rotation shaft 111, a core 112 fixed to the rotation shaft 111, a commutator 113 fixed to the rotation shaft 111, and a core 112. Are provided with a pair of insulators 114 and 115, and windings 116 a to 116 h wound around the core 112 via the insulators 114 and 115. The armature 103 is rotatably held by bearings (not shown) held at both ends of the rotating shaft 111 at the bottom center of the yoke housing 104 and the center of the end frame. The core 112 is disposed so as to face the permanent magnet 105 and be surrounded by the periphery (see FIG. 1).

  The core 112 is formed (sintered) of, for example, magnetic powder, and as shown in FIG. 4, a main body portion 121 having a substantially octagonal column shape and a radial shape radially outward from each side surface of the main body portion 121. 8 teeth portions 122a to 122h extending in the direction. These teeth parts 122a-122h are integrally connected via the main body part 121, and are disposed at equal angular intervals in the circumferential direction. Each of the teeth portions 122a to 122h has a certain width in the circumferential direction and extends radially from the center of each side surface of the main body 121, and from the radially outer end of the extension 118. It has the convex part 119 which protrudes in the circumferential direction both sides, and has comprised the substantially T shape.

  The core 112 (main body 121) is formed with a shaft insertion hole 123 that passes through the center. As shown in FIG. 2, the core 112 is fixed to the rotation shaft 111 by inserting the rotation shaft 111 into the shaft insertion hole 123 by press-fitting.

  One insulator 114 facing the commutator 113 is made of synthetic resin, and as shown in FIG. 4, a plate-shaped main body cover portion 126 having a substantially octagonal shape and a radial direction from each side surface of the main body cover portion 126. Eight teeth cover portions 127 extending radially outward are provided. And the central part which penetrates the said main body cover part 126 in a substantially octagon forms the through-hole 126a. The main body cover portion 126 covers an outer peripheral edge portion of one end surface in the axial direction of the main body portion 121.

  The teeth cover portion 127 has an inner wall surface that fits with an outer wall surface of the teeth portions 122a to 122h, and an axial one side end surface of the teeth portions 122a to 122h (extending portions 118, convex portions 119). It has the 1st cover part 127a which covers, and a pair of 2nd cover part 127b which each covers the end surface of the circumferential direction both sides of the teeth parts 122a-122h. That is, the teeth cover portion 127 has a U-shape in which the radially outer end portion is expanded corresponding to the convex portion 119. And one 2nd cover part 127b which covers the end surface of the circumferential direction one side of each teeth part 122a-122h is set to the 2nd cover part 127b which covers the end surface of the circumferential direction other side of teeth part 122a-122h adjacent to this. It is formed to be continuous. Each teeth cover portion 127 is connected to the adjacent tooth cover portion 127 via the second cover portion 127b, and is the same as the axial end portion of the teeth portions 122a to 122h and the axially intermediate portion of the core 112. Covering both end faces of the circumferential direction along the direction.

  The insulator 114 having such a shape is attached to the core 112 from one side in the axial direction so that the tooth cover portions 127 and the tooth portions 122a to 122h are fitted to each other. Is covered to the middle part in the axial direction.

  The teeth cover portion 127 is formed with a first restriction wall portion 128 that is set thick in the same direction so as to protrude in the axial direction corresponding to the convex portion 119. As shown in FIG. 3, in the first restriction wall portion 128, the windings 116 a to 116 h wound around the teeth portions 122 a to 122 h via the insulator 114 (the teeth cover portion 127) protrude outward in the radial direction. This is to prevent this.

  On the other hand, the main body cover portion 126 is formed with a plurality of (eight) second restriction wall portions 129 projecting in the axial direction along each side forming a substantially octagonal shape. As shown in FIG. 3, in the second restriction wall portion 129, the windings 116 a to 116 h wound around the teeth portions 122 a to 122 h via the insulator 114 (the teeth cover portion 127) protrude radially inward. This is to prevent this.

  The other insulator 115 basically has the same shape as the insulator 114. The insulator 115 is attached to the core 112 from the other side in the axial direction in accordance with the above, thereby covering the core 112 up to an intermediate portion in the axial direction. And the core 112 with which both the insulators 114 and 115 were mounted | formed forms the slots 130a-130h between each adjacent teeth parts 122a-122h (tooth cover part 127). Each of the slots 130a to 130h serves as a passage for windings 116a to 116h wound around the tooth portions 122a to 122h via the insulators 114 and 115.

Next, a structure unique to one insulator 114 (a structure different from that of the other insulator 115) will be described below.
The second restriction wall portion 129 of the insulator 114 is disposed closer to one side in the circumferential direction (the side corresponding to the counterclockwise rotation direction in FIG. 4), and a passage 129a between the second restriction wall portions 129 adjacent to each other. Is forming. As shown in FIG. 3, the passage 129 a introduces the windings 116 a to 116 h wound around the tooth portions 122 a to 122 h via the insulator 114 to the inner peripheral side from the second restriction wall portion 129. Alternatively, the windings 116a to 116h introduced on the inner peripheral side are led out to the next tooth portions 122a to 122h side.

  That is, in any of the tooth portions 122a to 122h, the passage 129a disposed on one side in the circumferential direction (the side corresponding to the clockwise direction in FIG. 3) is further forward on the inner circumferential side than the second restriction wall portion 129. The passages 129a that lead out the windings 116a to 116h extending from the teeth portion to the teeth portions 122a to 122h and are arranged on the other side (the side corresponding to the counterclockwise rotation direction in FIG. 3) are connected to the teeth portions 122a to 122h. The windings 116a to 116h wound around 122h are introduced to the inner peripheral side with respect to the second restriction wall portion 129 in order to extend to the next tooth portion.

  In the present embodiment, the windings 116a to 116h are wound continuously (concentrated) around the tooth portions 122a to 122h while exceeding the adjacent tooth portions (here, two adjacent tooth portions). Volume). The windings 116a to 116h are sequentially wound around the previous teeth 122a to 122h (concentrated winding) and then wound around the next tooth portion (concentrated winding). Is wound around all the teeth portions 122a to 122h. In other words, the windings 116a to 116h are wound (concentrated winding) around the teeth portions 122a to 122h sequentially passing the adjacent teeth portions, and are arranged on the inner peripheral side with respect to the second restriction wall portion 129. A connecting wire 117 extending in the circumferential direction is formed between the two passages 129a. Note that the circumferential direction related to the extension of the connecting wire 117 means a direction intersecting the radial direction, and does not mean a direction strictly along the circumference.

  Further, the main body cover portion 126 is formed with a guide wall portion 131 projecting in an annular shape in the axial direction at a radial intermediate portion between the through hole 126a and the second restriction wall portion 129. The guide wall 131 guides the connecting wire 117 that extends from the previous teeth 122 a to 122 h to the next tooth on the inner peripheral side of the second restriction wall 129. That is, the crossover wire 117 is regulated by the guide wall 131 to move inward in the radial direction, whereby the position / posture on the main body cover 126 is generally defined.

  The guide wall 131 is formed with a plurality of (eight) notches 132 that open in the radial direction in accordance with the circumferential positions of the slots 130a to 130h. Each notch 132 is disposed at an intermediate portion which is substantially the center of the crossover 117 (see FIG. 3). The main body cover portion 126 is formed with a plurality of (eight) pedestal portions 133 extending radially outward from the inner peripheral edge portion and penetrating the notches 132. The pedestal 133 has a smaller axial projection length than the guide wall 131 (see FIG. 2). A positioning wall portion 134 is further formed at the distal end portion in the radial direction of the pedestal portion 133 so as to protrude in the axial direction. The notches 132, the pedestal part 133, and the positioning wall part 134 are used for positioning the commutator 113 in the circumferential direction when the windings 116a to 116h are electrically connected to the commutator 113.

  As shown in FIG. 5, the commutator 113 includes a commutator body 141 and a short-circuit member 151. The commutator body 141 has a substantially cylindrical main body insulating material 142 and a plurality of (in the present embodiment, 24) segments having a substantially rectangular plate shape disposed on the outer peripheral surface of the main body insulating material 142 at equal angular intervals. 1 to 24 (see FIG. 3). The inner periphery of the main body insulating material 142 constitutes a shaft through hole 143 into which the rotating shaft 111 is inserted.

  A peripheral wall portion that protrudes in the axial direction along the inner peripheral surface (shaft through hole 143) on the end surface on the one side in the axial direction of the main body insulating material 142 (the lower side surface in FIG. 5 and the end surface on the core 112 side). 144 is formed. The main body insulating material 142 is formed with an annular short-circuit member accommodating recess 145 that continues from the peripheral wall portion 144 to the outer peripheral surface.

  The segments 1 to 24 have a length equivalent to the axial length of the outer peripheral surface of the main body insulating material 142, and are fixed to the outer peripheral surface of the main body insulating material 142 so as to form a substantially cylindrical shape as a whole. Yes. Each segment 1-24 is arrange | positioned so that the end surface of the axial direction one side may become flush with the bottom face of the said short circuit member accommodating recessed part 145. FIG. The anode and cathode side power supply brushes 106 and 107 are brought into contact (pressing contact) with the segments 1 to 24 from the outside in the radial direction (see FIG. 2). In addition, the main body side protrusion part 30 which protrudes to a radial direction outer side is formed in the edge part of the axial direction one side (lower side of FIG. 5) of each segment 1-24. The main body side protrusion 30 is for connecting the short-circuit member 151 and is arranged closer to one side in the circumferential direction (the side corresponding to the clockwise direction in FIG. 3).

  As shown in FIG. 6, the short-circuit member 151 is interposed between two short-circuit component groups 31a and 31b having basically the same shape except that they are symmetrical, and both short-circuit component groups 31a and 31b. And an insulating material 32. Each short circuit component group 31a, 31b includes a plurality of outer peripheral terminals 33a, 33b arranged in the circumferential direction, a plurality of inner peripheral terminals 34a, 34b arranged in the circumferential direction inside the outer terminals 33a, 33b, A plurality of connecting portions 35a and 35b for connecting the outer peripheral side terminals 33a and 33b and the inner peripheral side terminals 34a and 34b with a predetermined angle shift in the circumferential direction are formed in the same plane. The outer peripheral side terminals 33a and 33b, the inner peripheral side terminals 34a and 34b, and the connecting portions 35a and 35b are formed by 24 for each of the short circuit component groups 31a and 31b.

  Each outer peripheral side terminal 33a, 33b has an outer diameter equivalent to the outer diameter of the segments 1-24 and a width in the circumferential direction smaller than the segments 1-24. Protrusions 37a and 37b projecting radially outward are formed on the side corresponding to the rotational direction. These projecting portions 37a and 37b have the same shape as the main body side projecting portion 30 in a plan view seen from the axial direction. The segments 1 to 24 and the outer peripheral side terminals 33a and 33b (short-circuit constituent member groups 31a and 31b) are formed by, for example, spot welding the main body side protruding portions 30 and the protruding portions 37a and 37b overlapped in the axial direction. They are joined together.

  Further, eight of the plurality of outer peripheral terminals 33b are formed with claw portions 38 projecting radially outward on the other circumferential side (the side corresponding to the counterclockwise rotation direction in FIG. 6). The outer peripheral side terminals 33b having the claw portions 38 are arranged at equal angular intervals every two pieces. The radial distance to the tip of the claw 38 is set equal to the radial distance to the inner peripheral surface of the positioning wall 134. The claw portion 38 has a folded piece 38a bent in parallel with the axial direction in a state before the windings 116a to 116h are wound.

  On the other hand, each inner peripheral side terminal 34 a, 34 b has an inner diameter equivalent to the outer diameter of the peripheral wall portion 144. These inner peripheral side terminals 34a and 34b are joined together by spot welding, for example, in a state where they are overlapped in the axial direction. That is, the short circuit component groups 31a and 31b are electrically connected by joining the inner peripheral terminals 34a and 34b.

  Each of the connecting portions 35a and 35b shifts the outer peripheral side terminals 33a and 33b and the inner peripheral side terminals 34a and 34b by a predetermined angle (60 degrees) in the circumferential direction (in the present embodiment, the four terminals are shifted). It is connected. Each connecting portion 35a, 35b is formed along an involute curve. These connecting portions 35a and 35b are overlapped (stacked) in the same direction so as to be shifted in opposite directions as viewed from the axial direction.

  The insulating material 32 is made of an insulating resin material, and is formed in an annular shape having an inner diameter and an outer diameter equivalent to the distance in the radial direction to the base end portion and the distal end portion of the connecting portions 35a and 35b. The insulating material 32 integrally connects the short-circuit constituting member groups 31a and 31b with the connecting portions 35a and 35b being in non-contact with each other. That is, the short circuit component groups 31 a and 31 b are overlapped (stacked) in the axial direction so that the connecting portions 35 a and 35 b are not in contact with each other via the insulating material 32. The short-circuit constituting member groups 31a and 31b having a structure divided into a plurality in the circumferential direction are integrated by interposing the insulating material 32 and are insulated from each other at the connecting portions 35a and 35b.

  The short circuit component groups 31a and 31b slightly swell in the axial direction by the thickness of the insulating material 32 at the connecting portions 35a and 35b, but the outer peripheral terminals 33a and 33b and the inner peripheral terminals 34a and 34b are also included. Including the layers that do not enter the axial direction, they are substantially coplanar.

  The short-circuit member 151 having such a structure is accommodated in the short-circuit member accommodating recess 145 in such a manner that the inner peripheral terminals 34a and 34b are inserted in the axial direction into the peripheral wall portion 144 of the commutator body 141. The thickness of the short-circuit member 151 is set so as not to protrude in the axial direction from the peripheral wall portion 144 in the accommodated state in the short-circuit member accommodating recess 145. Further, the short-circuit member accommodating recess 145 is continuous to the outer peripheral surfaces of the segments 1 to 24, so that the short-circuit member 151 (short-circuit component group 31 a, 31 b) overlaps the main body side protrusion 30 in the axial direction. As described above, the protrusions 37a and 37b are protruded radially outward from the outer peripheral surface of the commutator body 141 (segments 1 to 24). The short-circuit member 151 (short-circuit component group 31a, 31b) has the projections 37a, 37b joined together with the main body-side projection 30, so that the outer terminals 33a, 33b are electrically connected together with the segments 1-24. And is fixed to the commutator body 141. The outer peripheral side terminal 33b having the claw portion 38 is connected to the eight segments 1, 4, 7, 10, 13, 16, 19, and 22.

  The short-circuit member 151 fixed to the commutator body 141 protrudes the claw portion 38 radially outward from the outer peripheral surface of the commutator body 141 (segments 1 to 24). As described above, the radial distance to the tip of the claw 38 is set to be equal to the radial distance to the inner peripheral surface of the positioning wall 134.

  The commutator 113 is fixed to the rotating shaft 111 by inserting the rotating shaft 111 into the shaft through hole 143 by press-fitting. At this time, the claw portion 38 extends radially outward from the guide wall portion 131. The commutator 113 is assembled so that the claw portion 38 penetrates the notch 132 of the guide wall portion 131 so as to contact the pedestal portion 133, and its axial and circumferential positions are positioned. Yes. The commutator 113 is positioned more stably by positioning the tip (folded piece 38 a) of the claw 38 by fitting with the positioning wall 134 of the insulator 114.

  As the commutator 113 is assembled, the claw portion 38 positioned by the positioning wall portion 134 is formed by guiding the guide wall portion 131 in the subsequent winding of the windings 116a to 116h. It is arranged in the middle part. That is, the connecting wire 117 guided by the guide wall portion 131 is disposed on the claw portion 38 at an intermediate portion thereof. As shown in FIG. 7 (a), the connecting wire 117 arranged on the claw portion 38 is prevented from being radially displaced by the folded piece 38a bent in parallel with the axial direction at this stage. ing. 7B, when the winding of the windings 116a to 116h is completed, the connecting wire 117 and the claw portion 38 are arranged so that the folded piece 38a holds the connecting wire 117. Are folded back to the center side and joined by fusing or the like. The crossover 117 and the claw 38 (commutator 113) are electrically connected. Therefore, the connecting wire 117 is connected to the connecting wire 117 formed between the windings 116a to 116h wound around the previous tooth portions 122a to 122h and the winding wound around the next tooth portion. The ends of the windings 116a to 116h for coupling with the claw portion 38 (commutator 113).

  In the assembled state of the commutator 113, a part of the commutator 113 together with the claw portion 38 is surrounded by the guide wall portion 131 by a difference in the protruding length between the guide wall portion 131 and the pedestal portion 133. Immerse yourself in the space. This is to reduce the axial length loss of the armature 103 and suppress the increase in size in the axial direction.

  FIG. 8 is a development view in which the armature 103 in which the commutator 113 (segments 1 to 24) and the windings 116a to 116h are electrically connected in the above-described manner is developed in a plane. The short-circuit member 151 is connected so as to have the same potential as the eighth and sixteenth segments in the circumferential direction with respect to a certain segment among the 24 segments 1 to 24, that is, at intervals of 120 degrees. The three segments are electrically connected so as to be at the same potential, and eight segment groups are set. And the nail | claw part 38 is arrange | positioned at equal intervals and it connects so that one nail | claw part may be provided from the segment of the same electric potential. Although not shown, the claw portions 38 provided in the segment of FIG. 8 are at positions 1, 4, 7, 10, 13, 16, 19, and 22. That is, the claw portion 38 is provided for every three segments.

  Next, the manufacturing mode of the armature 103 will be described collectively. In manufacturing the armature 103, first, the core 112 and the commutator 113 on which the insulators 114 and 115 are mounted are fixed to the rotating shaft 111. At this time, the commutator 113 is assembled so that the claw portion 38 abuts the pedestal portion 133 in such a manner as to penetrate the notch 132 of the guide wall portion 131. The axial position of the commutator 113 at this time coincides with the same position in the completed state (a position that does not require re-pressing).

  In winding of the windings 116a to 116h, the windings 116a to 116h are wound (concentrated winding) around the first teeth portions 122a to 122h, and then are wound from the passage 129a to the inside of the second regulating wall portion 129. Introduce to the circumferential side. And it guide | induces from the inner peripheral side of the 2nd control wall part 129 over two adjacent teeth parts so that the crossing line 117 may be formed in the circumferential direction, guiding it to the said guide wall part 131, Wound around the teeth part (concentrated winding). At this time, as described above, the connecting wire 117 guided by the guide wall portion 131 is naturally arranged on the claw portion 38 in the intermediate portion. In this manner, the winding of the windings 116a to 116h around the teeth portions 122a to 122h is sequentially performed, whereby the winding of the windings 116a to 116h around all the teeth portions 122a to 122h is completed.

  Then, for example, a jig is inserted from the commutator 113 side, the folded piece 38a is folded back to the center side so as to sandwich the jumper wire 117, and the jumper wire 117 and the claw portion 38 are joined by fusing or the like. To do. Thereby, the commutator 113 and the windings 116 a to 116 h are electrically connected, and the manufacture of the armature 103 is completed.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the claw portion 38 extends radially outward from the guide wall portion 131, so that the claw portion 38 is arranged in accordance with the formation position of the crossover wire 117. In this case, the connecting wire 117 guided by the guide wall portion 131 is naturally arranged on the claw portion 38 at an intermediate portion thereof. As described above, the connecting operation between the windings 116a to 116h and the claw portion 38 can be easily performed by setting the connecting wire 117 and the claw portion 38 at a position where it can be easily coupled. For example, when the windings 116a to 116h are wound, a special operation for hooking the connecting wire 117 to the claw portion 38 as in Patent Document 1 is not necessary.

  (2) In the present embodiment, the claw portion 38 extends through the notch 132 so as to extend radially outward from the guide wall portion 131 without interfering with the guide wall portion 131. And the claw part 38 which penetrates the said notch 132 is positioned by the said positioning wall part 134, Therefore The said crossover wire 117 can be arrange | positioned more smoothly on the said claw part 38. FIG.

  (3) In the present embodiment, since the short-circuit member 151 and the claw portion 38 are integrated, for example, compared to a case where a short-circuiting lead wire or a terminal for connecting this to the claw portion is provided separately. An increase in the number of parts can be suppressed.

(4) In the present embodiment, it is possible to provide a DC motor that can suppress an increase in the number of manufacturing steps.
(5) In the present embodiment, the pedestal 133 and the positioning wall 134 are coupled to the claw 38 by forming a wall that separates the claw 38 in the axial direction with respect to the main body cover 126. It can prevent that windings other than winding 116a-116h (crossover wire 117) contact this.

  (6) In the present embodiment, a part of the commutator 113 together with the claw portion 38 is enclosed in a space surrounded by the guide wall portion 131 by a difference in protrusion length between the guide wall portion 131 and the pedestal portion 133. I was immersed. Therefore, the armature 103 can be reduced in size in the axial direction by the amount of immersion in the axial direction.

  Further, since the core 112 and the commutator 113 are fixed to the rotary shaft 111 in advance at a position where the connecting wire 117 and the claw portion 38 are easily coupled, for example, the windings 116a to 116h are wound. There is no need to move them relative to each other in the axial direction. And since the deformation | transformation of the coupling | bond part of the said windings 116a-116h and the said nail | claw part 38 can also be avoided, the reliability of the said coupling | bond part can be improved.

  (7) In the present embodiment, since the claw portion 38 is disposed between the two tooth portions, the winding (the connecting wire 117) is disposed on the inner side, and the claw portion and the winding are more Easy to connect.

  (8) Since the windings 114a to 114h are wound around the teeth portions 122a to 122h by concentrated winding, the space factor of the windings 114a to 114h increases. Therefore, the performance of the DC motor 101 can be further improved.

  (9) The segments 1 to 24 having the same potential are short-circuited by the short-circuit member 151. Therefore, the anode side power supply brush 106 and the cathode side power supply brush 107 can be provided one by one, and the DC motor 101 can be further miniaturized.

  (10) In the DC motor 101 of this embodiment, the number P of magnetic poles is six. The core 112 includes eight slots 130a to 130h formed by eight teeth portions 122a to 122h and the teeth portions 122a to 122h. The commutator 113 includes 24 segments 1 to 24, and the segments 1 to 24 are short-circuited by the short-circuit member 151 between the segments 1 to 24 having the same potential. Therefore, a torque vector having the same size and the opposite direction is generated between the axisymmetric slots 130a to 130h. As a result, it is possible to provide the DC motor 101 in which vibration of the armature 103 is suppressed and vibration is small.

(Second Embodiment)
Hereinafter, a second embodiment in which the present invention is embodied in a 6-pole 8-slot 24-segment brushed DC motor will be described with reference to the drawings. In addition, since 2nd Embodiment is a structure which changed only the armature and its manufacturing aspect of 1st Embodiment, the detailed description is abbreviate | omitted about the same part.

  As shown in FIGS. 9 and 10, the armature 203 of this embodiment includes the rotating shaft 111, a core 212 fixed to the rotating shaft 111, and a commutator 213 that is also fixed to the rotating shaft 111, A pair of insulators 214 and 215 (see FIG. 10) attached to the core 212 and windings 216a to 216h wound around the core 212 via the insulators 214 and 215 are provided.

  The core 212 is formed (sintered) of magnetic powder, for example, and has a cylindrical main body portion 221 having a substantially octagonal outer wall surface, and eight tooth portions 222a similar to the tooth portions 122a to 122h. To 222h. The main body portion 221 forms four arm portions 224 extending radially inward from the inner wall surface 223 that penetrates in a circular shape in the axial direction at equal angular intervals, and is continuous with the distal end portions of these arm portions 224. A cylindrical inner ring portion 225 (see FIG. 10) is formed. The arm portion 224 and the inner ring portion 225 constitute a connecting portion for connecting the core 212 to the rotating shaft 111, and the inner ring portion 225 is formed with a shaft insertion hole 226 that penetrates the center portion. . The core 212 is fixed to the rotary shaft 111 by inserting the rotary shaft 111 into the shaft insertion hole 226 by press-fitting. In addition, the said arm part 224 is arrange | positioned according to the position of the circumferential direction center part of every other said teeth part 222b, 222d, 222f, 222h. And, on the inner peripheral side of the core 212, four gaps S partitioned by the arm portion 224 are formed between the inner wall surface 223 and the outer peripheral surface of the inner ring portion 225. Needless to say, these voids S penetrate in the axial direction.

  One insulator 214 facing the commutator 213 is made of synthetic resin, and has a cylindrical main body cover portion 227 having a substantially octagonal inner wall surface equivalent to the outer wall surface of the main body portion 221, and the main body cover portion 227. Eight teeth cover portions 228 extending radially outward from each side surface. Each tooth cover portion 228 has an inner wall surface that fits with the tooth portions 222a to 222h. The insulator 214 is fitted to the main body portion 221 in the main body cover portion 227 and covers the outer wall surface on one axial side of the main body portion 221. Further, the insulator 214 is fitted to the teeth portions 222a to 222h in the respective tooth cover portions 228, and covers one end surface in the axial direction and both end surfaces in the circumferential direction of the teeth portions 222a to 222h. That is, the insulator 214 is attached to the core 212 from one side in the axial direction, thereby covering the core 212 up to an intermediate portion in the axial direction.

  The other insulator 215 has basically the same shape as the insulator 214. The insulator 215 is attached to the core 212 from the other side in the axial direction in accordance with the above, thereby covering the core 212 up to an intermediate portion in the axial direction. And the core 212 with which both the insulators 214 and 215 were mounted | formed forms the slots 230a-230h between each adjacent teeth part 222a-222h (tooth cover part 228). Each of the slots 230a to 230h forms a passage for windings 216a to 216h wound around the teeth portions 222a to 222h via the insulators 214 and 215.

  In the present embodiment, the windings 216a to 216h are wound continuously (concentrated) around the tooth portions 222a to 222h while passing over the adjacent tooth portions (here, two adjacent tooth portions). Volume). The windings 216a to 216h are sequentially wound around the previous teeth portion 222a to 222h (concentrated winding) and then wound around the next tooth portion (concentrated winding). Is wound around all the teeth portions 222a to 222h. That is, each of the windings 216a to 216h is wound (concentrated winding) around each of the teeth portions 222a to 222h sequentially over the adjacent teeth portion, and is wound in a tensioned state on the inner peripheral side of one insulator 214. A connecting wire 217 extending linearly in the direction is formed. Each crossover line 217 extends in the same direction while passing over two adjacent tooth portions from one circumferential direction side (the side corresponding to the counterclockwise rotation direction in FIG. 9) of any tooth portion 222a to 222h, It reaches the opposite side of the teeth in the circumferential direction. The connecting wire 217 extending linearly between the teeth portions 222a to 222h is arranged so that the intermediate portion in the longitudinal direction crosses the position (space) where the gap portion S is extended in the axial direction. It goes without saying that the connecting wire 217 extends in a straight line in a tensioned state, so that the position / posture on the core 212 (gap S) is defined.

  Like the commutator 113, the commutator 213 includes the commutator body 141 (see FIG. 5) and the short-circuit member 151 (see FIG. 6). However, in this embodiment, the eight outer peripheral terminals 33b connected to the segments 1, 4, 7, 10, 13, 16, 19, and 22 have the claw portions 38 as shown in FIG. A downward claw portion 218 that protrudes radially outward in a different shape is formed. The distance in the radial direction to the tip of each claw 218 is shorter than the inner diameter of the inner wall surface 223 of the core 212, and the crossover line 217 crosses the position (space) where the gap S is extended in the axial direction. It is set longer than the radial distance to the middle part in the longitudinal direction. The claw portion 218 has a folded piece 218a that is bent outward (in the core 212 side) in parallel with the axial direction in a state before the connection with the connecting wire 217. Needless to say, the outer diameter of the commutator 213 (the outer diameter of the segments 1 to 24 having a substantially cylindrical shape as a whole) is set shorter than the inner diameter of the inner wall surface 223 of the core 212.

  The commutator 213 is fixed to the rotary shaft 111 by inserting the rotary shaft 111 into the shaft through hole 143 by press-fitting. Note that the windings 216a to 216h are wound in advance on the core 212 fixed to the rotating shaft 111, and the connecting wire 217 between the teeth portions 222a to 222h has a predetermined value due to the tension. Held in position. The claw portion 218 is disposed at an angular position between the adjacent arm portions 224, that is, a position obtained by extending the gap portion S in the axial direction, and is disposed on the crossover line 217 so as to be located at the middle portion in the longitudinal direction. Abut.

  As shown in FIG. 11 (a), the claw portion 218 disposed on the connecting wire 217 does not interfere with the core 212, other connecting wires 217, etc., at the intermediate portion in the longitudinal direction of the connecting wire 217. Abut. In particular, the contact portions of the connecting wire 217 and the claw portion 218 are open on both sides in the axial direction by the gap portion S. In this state, as shown in FIG. 11 (b), the connecting wire 217 and the claw portion 218 are folded back toward the center so that the folded piece 218a sandwiches the connecting wire 217, and one side in the axial direction. And it is joined (welded) by fusing by the jigs 231 and 232 inserted from the other side (the upper side and the lower side in FIG. 11B). And the said crossover 217 and the nail | claw part 218 (commutator 213) are electrically connected. The connecting wire 217 formed between the windings 216a to 216h wound around the previous tooth portions 222a to 222h and the winding wound around the next tooth portion is coupled to the connecting wire 217. This is a terminal of windings 216a to 216h for coupling with the claw portion 218 (commutator 213).

  Here, the manufacturing mode of the armature 203 will be described collectively. In manufacturing the armature 203, first, the windings 216a to 216h are wound around the core 212 on which the insulators 214 and 215 are mounted. In the winding of the windings 216a to 216h, the windings 216a to 216h are wound (concentrated winding) on the first teeth portions 222a to 222h, and then the next successive two tooth portions are passed over to the next. Wind around the teeth (concentrated winding). At this time, as described above, the connecting wire 217 extends linearly in the circumferential direction in a tension state. In this manner, the winding of the windings 216a to 216h around all the teeth portions 222a to 222h is completed by sequentially winding the windings 216a to 216h around the teeth portions 222a to 222h. The core 212 may be fixed to the rotating shaft 111 (press-fitting process) either before or after the winding process of the windings 216a to 216h.

  Next, the commutator 213 is fixed to the rotating shaft 111 to which the core 212 is fixed. At this time, the commutator 213 is assembled so that the claw portion 218 comes into contact with the intermediate portion in the longitudinal direction of the crossover wire 217. The axial position of the commutator 213 at this time coincides with the same position in the completed state (a position that does not require re-pressing).

  Thereafter, the folded piece 218a is folded back to the center side so as to sandwich the crossover wire 217, and one side and the other side in the axial direction using the gap S (upper side and lower side in FIG. 11B). Then, the jigs 231 and 232 are inserted, and the connecting wire 217 and the claw portion 218 are joined by fusing. Thereby, the commutator 213 and the windings 216a to 216h are electrically connected, and the manufacture of the armature 203 is completed.

As described in detail above, according to the present embodiment, the following effects can be obtained in addition to the effects (3), (4), (7) to (10) in the first embodiment.
(1) In the present embodiment, tension is applied to the connecting wire 217 between the tooth portions 222a to 222h, so that the connecting wire 217 is held at a predetermined position after the windings 216a to 216h are wound. . On the other hand, the claw portion 218 of the commutator 213 protrudes radially outward from the ends of the segments 1, 4, 7, 10, 13, 16, 19, 22 and the position of the claw portion 218 The position of the crossover line 217 is matched. Therefore, when connecting the windings 216a to 216h (crossover wire 217) and the commutator 213 (claw portion 218), they can be easily connected without a separate holding member. In addition, since the windings 216a to 216h are wound before the commutator 213 is press-fitted, the winding (crossover wire 217) is brought into contact with the claw portion 218 when the commutator 213 is press-fitted. The operation of hooking the winding (crossover wire 217) to 218 becomes unnecessary, and the number of man-hours can be reduced.

  (2) In the present embodiment, the insertion direction of the jigs 231 and 232 and the penetration direction of the gap portion S are matched, and the claw portion 218 of the commutator 213 that is the axially extended position of the gap portion S and the The claw portion 218 and the connecting wire 217 are joined by fusing without being obstructed by the connecting wire 217 or the core 212 (the connecting portion arm portion 224, the inner ring portion 225, etc.) at the contact portion with the connecting wire 217. can do.

  (3) In this embodiment, since the crossover 217 is held in advance at a position where the claw portion 218 is easily coupled, for example, the commutator 213 is press-fitted into the rotating shaft 111 to which the core 212 is fixed. The windings 216a to 216h and the commutator 213 (claw portion 218) can be combined by completing the process once. And since the deformation | transformation of the coupling | bond part of the said windings 216a-216h and the said nail | claw part 218 can also be avoided, the reliability of the said coupling | bond part can be improved.

(Third embodiment)
Hereinafter, a third embodiment in which the present invention is embodied in a 6-pole 8-slot 24-segment brushed DC motor will be described with reference to the drawings. In addition, since the third embodiment has a configuration in which the armatures of the first and second embodiments and the manufacturing mode thereof are changed, detailed description of the same parts is omitted.

  As shown in FIG. 12, the armature 303 of this embodiment includes the rotating shaft 111, the core 312 fixed to the rotating shaft 111, the commutator 313 fixed to the rotating shaft 111, and the core 312. Winding windings 314a to 314h are provided.

  As illustrated in FIG. 14, the core 312 includes a main body portion 321 and a plurality (eight in the present embodiment) of tooth portions 322a to 322h. The main body portion 321 has a cylindrical shape, and a shaft insertion hole 323 penetrating in the axial direction is formed by an inner peripheral surface thereof. As shown in FIG. 13, the inner diameter of the shaft insertion hole 323 is slightly smaller than the outer diameter of the rotation shaft 111, and the core 312 rotates when the rotation shaft 111 is press-fitted into the shaft insertion hole 323. It is fixed with respect to the shaft 111.

  A housing hole 325 is formed in the end surface 324 of the main body 321 on the commutator 313 side. The storage hole 325 is formed so that the shape seen from the axial direction is a regular octagon (see FIG. 14). Further, in the main body portion 321, a portion from the bottom surface 326 of the storage hole 325 to the end surface 324 on the commutator 313 side is a side wall portion 327 of the storage hole 325. An adjustment hole 329 having the same shape as the storage hole 325 is also formed on the end face 328 of the main body 321 on the side opposite to the commutator 313.

  As shown in FIG. 14, the outer shape of the main body portion 321 (the shape formed by the outer peripheral surface of the main body portion 321) is formed so that the shape seen from the axial direction is a regular octagon shape that matches the storage hole 325. Has been. That is, when the main body 321 is viewed from the axial direction, the outer shape of the main body 321 is the circumferential position of the regular octagonal vertices X1 to X8 in the storage hole 325 and the regular octagonal apex in the outer shape of the main body 321. It is formed so that the circumferential positions of Y1 to Y8 coincide.

  The teeth portions 322 a to 322 h are formed on the outer peripheral surface of the main body portion 321. The lengths of the teeth portions 322a to 322h in the axial direction are formed to be equal to the length of the main body portion 321 in the axial direction. Moreover, each teeth part 322a-322h is extended toward the radial direction outer side from the width direction center part of the eight surfaces which comprise the outer peripheral surface of the main-body part 321 when it sees from an axial direction. That is, the teeth portions 322 a to 322 h extend radially from the main body portion 321. When the core 312 is viewed from the axial direction, the regular octagonal vertices X1 to X8 of the storage hole 325 are located in the center between the tooth portions 322a to 322h in the circumferential direction.

  Between the eight teeth portions 322a to 322h, slots 330a to 330h are formed by the teeth portions 322a to 322h, respectively. As shown in FIG. 12, windings 314 a to 314 h are wound around the teeth portions 322 a to 322 h in a concentrated manner so as to pass through the slots 330 a to 330 h via insulators 331. Each winding 314a-314h is provided with the coil end part 333 located in the axial direction both ends of the teeth parts 322a-322h (refer FIG. 13). More specifically, the coil end portion 333 is more axial in the axial direction than the insulator 331 (however, a portion having the same thickness as the insulator 331 on the end surface 324 of the main body portion 321) on both axial end surfaces 312a and 312b of the core 312. It is a protruding part.

  An inner peripheral surface of a cylindrical insulator 341 provided in the commutator 313 forms a shaft through hole 342 into which the rotating shaft 111 is press-fitted. The inner diameter of the shaft through hole 342 is formed slightly smaller than the outer diameter of the rotating shaft 111, and the commutator 313 is fixed to the rotating shaft 111 by press-fitting the rotating shaft 111 into the shaft through hole 342. .

  Each segment 1-24 is being fixed to the outer peripheral surface of the insulator 341 so that the longitudinal direction may follow an axial direction. On the outer peripheral surface of the insulator 341, the segments 1 to 24 are arranged at equiangular intervals in the circumferential direction and have a gap between the adjacent segments 1 to 24.

  Of the segments 1 to 24, eight segments 1, 4, 7, 10, 13, 16, 19, 22 located at equiangular intervals in the circumferential direction, that is, every other segment 1, 4, 7, 10 , 13, 16, 19, and 22 are provided with claw portions 343a to 343h. That is, in this embodiment, eight claw portions 343a to 343h are formed in the same number as the number of teeth portions 322a to 322h. Incidentally, the storage hole 325 is formed so that the shape seen from the axial direction is a regular octagonal shape in which the circumferential positions of the claws 343a to 343h and the circumferential positions of the vertices X1 to X8 coincide. Has been. Further, the storage hole 325 is formed to have a size capable of storing one axial end portion of the commutator 313 including the claw portions 343a to 343h.

  As shown in FIG. 13, the claw portions 343 a to 343 h are extended from the end portions of the segments 1, 4, 7, 10, 13, 16, 19, 22 on the core 312 side. 7, 10, 13, 16, 19, and 22 are formed in a plate shape whose width is narrower than that. The claw portions 343a to 343h are folded back toward the end surface of the commutator 313 on the side opposite to the core 312 so that the windings 314a to 314h can be hooked. Thereby, the nail | claw parts 343a-343h become the shape protruded toward the radial direction outer side of the commutator 313. FIG. When the claw portions 343a to 343h are folded, the axial length L1 is along the axial direction between the bottom surface 326 of the storage hole 325 and the tip of the coil end portion 333 on the commutator 313 side. The distance is shorter than the distance L2. In this embodiment, the distance L2 is the depth L3 of the storage hole 325 (in FIG. 13, the depth including the thickness of the insulator 333 on the end surface 324 is the depth of the storage hole 325) and the coil end. This corresponds to the sum of the axial width L4 of the portion 333. The windings 314a to 314h are connected to the claw portions 343a to 343h.

  As shown in FIG. 15, a short-circuit member 351 is disposed on the end surface of the insulator 341 on the core 312 side. In FIG. 13, the commutator 313 is shown with the short-circuit member 351 omitted. The short-circuit member 351 is for short-circuiting the segments 1 to 24 (every seven segments in this embodiment) having the same potential (see FIG. 17). The short-circuit member 351 includes two identical short-circuit component group groups 352a and 352b and an insulating material 353. As shown in FIG. 16, each short circuit component group 352a, 352b includes a plurality of outer peripheral terminals 354a, 354b arranged in the circumferential direction and a plurality of inner circumferences arranged in the circumferential direction inside the outer terminals 354a, 354b. Side terminals 355a and 355b. Moreover, each short circuit component group 352a, 352b includes a plurality of connecting portions 356a, 356b that connect the outer peripheral side terminals 354a, 354b and the inner peripheral side terminals 355a, 355b with a predetermined angle shift in the circumferential direction. These outer peripheral terminals 354a and 354b, inner peripheral terminals 355a and 355b, and connecting portions 356a and 356b are formed in substantially the same plane (substantially flat plate). In the present embodiment, 24 outer peripheral terminals 354a, 354b, inner peripheral terminals 355a, 355b, and connecting portions 356a, 356b are formed for each of the short circuit component groups 352a, 352b. In the present embodiment, the predetermined angle is 60 °, which is equal to an angle obtained by shifting the terminal by four.

  Locking portions 357a and 357b extending outward in the radial direction are formed on the outer peripheral side terminals 354a and 354b. The connecting portions 356a and 356b are formed along an involute curve. Further, as shown in FIG. 15, the connecting portions 356a and 356b are formed thinner than the outer peripheral side terminals 354a and 354b and the inner peripheral side terminals 355a and 355b, whereby the connecting portions 356a and 356b and the outer peripheral side terminal 354a are formed. , 354b and step portions 358a and 358b are formed between the connecting portions 356a and 356b and the inner peripheral terminals 355a and 355b.

  Such a short circuit component group 352a, 352b is formed by punching a plate-like conductive member. And each short circuit component group 352a, 352b is laminated | stacked in an axial direction so that connection part 356a, 356b may become reverse direction (the direction shifted from the same direction is reverse direction), and an outer peripheral side terminal is laminated | stacked 354a and 354b and inner peripheral side terminals 355a and 355b are in surface contact with each other in the stacking direction. The connecting portions 356a and 356b are not in contact with each other in the stacking direction by the step portions 358a and 358b. And the short circuit component group 352a, 352b is being fixed to the commutator 313 by the said latching | locking part 357a, 357b being fixed to the said segments 1-24, respectively.

  The insulating material 353 is made of an insulating resin material and is interposed between the connecting portions 356a and 356b arranged in the stacking direction. Specifically, the insulating material 353 is formed so as to fill the gaps between the outer peripheral side terminals 354a and 354b, the inner peripheral side terminals 355a and 355b, and the connecting portions 356a and 356b configured as described above.

  As shown in FIG. 13, the commutator 313 configured as described above is fixed to a position where one end of the commutator 313 on the core 312 side is housed in the housing hole 325 on the rotating shaft 111. . More specifically, in the commutator 313, a part of the claw portions 343 a to 343 h is accommodated in the accommodation hole 325, and the claw portions 343 a to 343 h are lower than the tip of the coil end portion 333 on the commutator 313 side. It is fixed with respect to the rotating shaft 111 so as to be positioned on the 326 side. Note that the end surface 313 a facing the core 312 of the commutator 313 in the axial direction does not contact the bottom surface 326 of the storage hole 325.

Next, a method for manufacturing the armature 303 configured as described above will be described.
First, the core 312 is fixed to the rotation shaft 111 by press-fitting the rotation shaft 111 into the shaft insertion hole 323 of the main body portion 321. Thereafter, the rotary shaft 111 is press-fitted into the shaft through hole 342 of the insulator 341, so that the commutator 313 is press-fitted and fixed to the rotary shaft 111. As shown in FIG. 18A, the commutator 313 has a rotating shaft so that the end portion on the side where the claw portions 343a to 343h are provided is opposed to the storage hole 325 formed in the main body portion 321 in the axial direction. 111 is provisionally fixed. At this time, the commutator 313 has a distance L5 between the end surface 313a facing the core 312 of the commutator 313 in the axial direction and the bottom surface 326 of the storage hole 325 on the rotating shaft 111, and the bottom surface 326 of the storage hole 325 is commutated. It is fixed at a position that is at least twice the distance L2 along the axial direction from the tip of the coil end portion 333 on the child 313 side. Incidentally, when the commutator 313 is fixed to the rotating shaft 111, the position of the tip of the coil end portion 333 is measured in advance. In FIG. 18A, the commutator 313 is fixed at a position on the rotating shaft 111 where the distance L5 is twice the distance L2. In this state, the windings 314a to 314h are wound around the teeth portions 322a to 322h via the insulator 331.

  As shown in FIGS. 12 and 17, first, the windings 314 a to 314 h are hooked on the claw part 343 a formed in the segment 1 and are in a position advanced 67.5 ° in the counterclockwise direction from the claw part 343 a. From the slot 330h side, a predetermined number of turns are wound around the tooth portion 322a between the slot 330h and the slot 330a. Next, the windings 314a to 314h are wound a predetermined number of turns from the side of the slot 330c at a position advanced by 135 ° counterclockwise from the slot 330a to the tooth portion 322d between the slot 330c and the slot 330d. The At this time, the windings 314a to 314h extend in the circumferential direction from the slot 330a toward the slot 330c, and are claw portions 343d formed on the segment 10 located between the slots 330a and 330c, that is, the slot 330a. A crossover 315 is formed that is hooked to the claw portion 343d located at a position advanced 67.5 ° in the counterclockwise direction from the top. The circumferential direction related to the extension of the connecting wire 315 means a direction intersecting the radial direction, and does not mean a direction strictly along the circumference.

  Thereafter, similarly, the windings 314 a to 314 h are wound around the core 312. That is, the windings 314a to 314h are hooked on the claw portion 343g at a position 67.5 ° in the counterclockwise direction from the slot 330d in the crossover wire 315, and 135 ° in the counterclockwise direction from the slot 330d. A predetermined number of turns are wound around the tooth portion 322g between the slot 330f and the slot 330g from the slot 330f side. Next, the windings 314a to 314h are hooked on the claw portion 343b at a position advanced 67.5 ° in the counterclockwise direction from the slot 330g in the connecting wire 315, and advanced 135 ° in the counterclockwise direction from the slot 330g. A predetermined number of turns are wound around the tooth portion 322b between the slot 330a and the slot 330b from the slot 330a side. Next, the windings 314a to 314h are hooked on the claw portion 343e at a position advanced by 67.5 ° in the counterclockwise direction from the slot 330b in the connecting wire 315, and advanced 135 ° in the counterclockwise direction from the slot 330b. A predetermined number of turns are wound around the tooth portion 322e between the slot 330d and the slot 330e from the slot 330d side. Next, the windings 314a to 314h are hooked on the claw portion 343h at a position advanced 67.5 ° in the counterclockwise direction from the slot 330e in the connecting wire 315, and advanced 135 ° in the counterclockwise direction from the slot 330e. From the slot 330g side at the position, a predetermined number of turns are wound around the tooth portion 322h between the slot 330g and the slot 330h. Next, the windings 314a to 314h are hooked on the claw portion 343c at a position 67.5 ° advanced in the counterclockwise direction from the slot 330h in the connecting wire 315, and advanced 135 ° in the counterclockwise direction from the slot 330h. A predetermined number of turns are wound around the tooth portion 322c between the slot 330b and the slot 330c from the slot 330b side. Next, the windings 314a to 314h are hooked on the claw portion 343f at a position advanced 67.5 ° in the counterclockwise direction from the slot 330c in the connecting wire 315, and advanced 135 ° in the counterclockwise direction from the slot 330c. A predetermined number of turns are wound around the tooth portion 322f between the slot 330e and the slot 330f from the slot 330e side. The windings 314a to 314h are wound around the tooth portion 322f of the connecting wire 315, and then hooked to the claw portion 343a at a position advanced 67.5 ° counterclockwise from the slot 330f.

  As described above, the windings 314a to 314h are wound (concentrated winding) on all the teeth portions 322a to 322h while being hooked on the claw portions 343a to 343h in the connecting wire 315. The windings 314a to 314h are joined to the claw portions 343a to 343h by fusing at the connecting wire 315 hooked on the claw portions 343a to 343h, and are electrically connected to the claw portions 343a to 343h (commutator 113). The That is, the connecting wire 315 is a terminal of the windings 314a to 314h for connecting to the claw portions 343a to 343h (commutator 313) to which the connecting wire 315 is connected.

  Next, in the commutator 313, as shown in FIG. 18B, one end in the axial direction on the core 312 side (the end on the side where the claws 343a to 343h are provided) is accommodated in the accommodation hole 325. Then, it is press-fitted again toward the bottom surface 326 of the storage hole 325. At this time, the commutator 313 is press-fitted until immediately before the end surface 313 a (the surface on which the short-circuit member 351 is disposed) facing the core 312 in the axial direction comes into contact with the bottom surface 326 of the storage hole 325. As a result, the end of the commutator 313 on the core 312 side is housed in the housing hole 325, and the claw portions 343 a to 343 h are disposed closer to the bottom surface 326 of the housing hole 325 than the tip of the coil end portion 333. In FIG. 18B, the crossover line 315 is omitted.

As described in detail above, according to the present embodiment, the following effects can be obtained in addition to the effects (3), (4), (7) to (10) in the first embodiment.
(1) Since the commutator 313 is fixed to the rotating shaft 111 so that one end in the axial direction thereof is accommodated in the accommodation hole 325, the armature 303 is reduced in size in the axial direction. In this embodiment, the storage hole 325 has a regular octagonal shape when viewed from the axial direction in which the circumferential positions of the vertices X1 to X8 coincide with the circumferential positions of the claw portions 343a to 343h. Is formed. Accordingly, the width of the side wall portion 327 of the storage hole 325 between the adjacent claw portions 343a to 343h is wider toward the inside in the radial direction than the case where the storage hole 325 is a round hole capable of storing the claw portions 343a to 343h. Become. Therefore, it is suppressed that the cross-sectional area along the radial direction of the side wall part 327 between adjacent claw parts 343a-343h is reduced. As a result, in the DC motor 101 provided with this armature 303, the magnetic flux passing through the core 312 (especially the side wall portion 327) is suppressed from being reduced, so that the armature is not degraded without reducing the performance of the DC motor 101. 303 can be reduced in size, and thus the DC motor 101 including the armature 303 can be reduced in size.

  (2) The outer shape of the main body 321 is formed in a regular octagonal shape in which the shape viewed from the axial direction matches the circumferential position of the vertexes X1 to X8 and the circumferential position of the vertexes X1 to X8 of the storage hole 325. Has been. And teeth part 322a-322h is formed in the width direction center part of the eight surfaces which constitute the peripheral face of main part 321. Therefore, the volumes of the slots 330a to 330h are increased by the amount that both sides of the base end portions of the tooth portions 322a to 322h are planar compared to the main body portion having a circular outer shape. As a result, when the number of windings of the windings 314a to 314h is the same as the conventional one, the length of the teeth portions 322a to 322h along the radial direction can be shortened, and the DC motor 101 can be reduced in the radial direction. Can be achieved. Further, when the outer diameter of the core 312 (the outer diameter at the tips of the teeth portions 322a to 322h) is the same as the conventional one, the number of turns of the windings 314a to 314h can be increased and the performance of the DC motor 101 is improved. Can be made.

  (3) The claw portions 343a to 343h have an axial length L1 from a distance L2 along the axial direction between the bottom surface 326 of the storage hole 325 and the tip end portion of the coil end portion 333 on the commutator 313 side. Is also formed short. Therefore, the claw portions 343a to 343h can be stored on the bottom surface 326 side of the storage hole 325 rather than the tip of the coil end portion 333 on the commutator 313 side. In the present embodiment, the claw portions 343a to 343h are The coil 315 is housed on the bottom surface 326 side of the housing hole 325 from the tip of the coil end portion 333 on the commutator 313 side. Therefore, the armature 303 is further downsized in the axial direction. Further, since the claw portions 343a to 343h do not come out on the side opposite to the core 312 from the tip of the coil end portion 333, the anode side power supply brush 106 and the cathode side power supply brush 107 are connected to the coil end portion 333 on the commutator 313 side. The coil end portion 333 can be brought close to just before the contact. Therefore, the further axial size reduction of the DC motor 101 can be achieved.

  (4) When the armature 303 is manufactured, the commutator 313 is configured such that the distance L5 between the core 312 of the commutator 313 and the end surface 313a facing the axial direction and the bottom surface 326 of the storage hole 325 is the bottom surface of the storage hole 325. It is fixed at a position that is at least twice the distance L2 along the axial direction between 326 and the tip of the coil end 333 on the commutator 313 side. In other words, the commutator 313 is configured such that the distance between the tip of the coil end portion 333 on the commutator 313 side and the end surface 313a facing the core 312 of the commutator 313 in the axial direction is the coil end portion 333 on the commutator 313 side. Is fixed to the rotating shaft 111 so as to be equal to or greater than the distance between the front end of the storage hole and the bottom surface 326 of the storage hole 325. In this state, the windings 314a to 314h are wound and connected to the claw portions 343a to 343h. That is, the commutator 313 has an axial end on the core 312 side accommodated in the accommodation hole 325, and the commutator 313 is longer than the distance connecting the claws 343a to 343h and the tip of the coil end 333 on the commutator 313 side. The windings 314a to 314h are connected while the lengths of the windings 314a to 314h between the coil end portion 333 on the child 313 side and the claw portions 343a to 343h are increased. Therefore, when one axial end of the commutator 313 on the core 312 side is housed in the housing hole 325, the windings 314a to 314h between the claw portions 343a to 343h and the coil end 333 on the commutator 313 side are stretched. It is prevented that it will be in the state. Therefore, when the windings 314a to 314h between the claw portions 343a to 343h and the coil end portion 333 on the commutator 313 side are stretched, the claw portions 343a to 343h are damaged or the claw portions 343a to 343h are connected to the commutator 313 side. It is possible to prevent the windings 314a to 314h between the coil end portion 333 and the coil end portion 333 from being cut. As a result, generation of defective products can be suppressed. Further, it is possible to prevent the windings 314a to 314h between the claw portions 343a to 343h and the coil end portion 333 on the commutator 313 side from being cut during the operation of the DC motor 101.

  (5) When the windings 314a to 314h are wound around the teeth portions 322a to 322h, for example, positions wound 67.5 ° in the counterclockwise direction from the slot 330a after being wound around the teeth portion 322a. It is hooked on the claw part 343d at (1). The windings 314a to 314h are wound a predetermined number of turns from the side of the slot 330c at a position advanced by 135 ° counterclockwise from the slot 330a to the tooth portion 322d between the slot 330c and the slot 330d. The The windings 314a to 314h are similarly wound around any of the tooth portions 322a to 322h. When the windings 314a to 314h are wound in this way, the windings 314a to 314h between the claw portions 343a to 343h and the coil end portion 333 on the commutator 313 side are returned to the core 312 side again. It is easy to allow movement of the commutator 313 when being press-fitted. As a result, when one axial end portion of the commutator 313 on the core 312 side is housed in the housing hole 325, the windings 314a to 314h between the claw portions 343a to 343h and the coil end portion 333 on the commutator 313 side are A stretched state is further prevented. Note that the coil ends on the claw portions 343a to 343h and the commutator 313 side are formed by making the windings 314a to 314h between the coils 332a to 332h and the claw portions 343a to 343h longer with some allowance. It is further prevented that the windings 314a to 314h between the portion 333 are stretched.

In addition, you may change the said embodiment as follows.
-In the said 1st Embodiment, as shown in FIG. 19, you may employ | adopt the nail | claw part 41 extended flatly on a radial direction outer side. Even in this case, when the claw portion 41 extends radially outward from the guide wall portion 131, the crossover wire 117 guided by the guide wall portion 131 naturally has the same claw at the intermediate portion. Arranged on the portion 41. When connecting the connecting wire 117 and the claw portion 41, for example, by joining them by laser welding, the connecting operation between the windings 116a to 116h and the claw portion 41 can be easily performed. .

In the first embodiment, the guide wall 131 may have a substantially octagonal cylindrical shape.
In the first embodiment, the notch 132, the pedestal 133, and the positioning wall 134 of the guide wall 131 may be omitted. In particular, when the notch 132 is omitted, the claw portion 38 interferes with the guide wall portion 131 and overlaps the guide wall portion 131 in the axial direction, but the connecting wire 117 guided by the guide wall portion 131 is It will still be placed on the claw 38.

-In said 1st Embodiment, you may form the nail | claw part 38 in the outer peripheral side terminal 33a. Alternatively, the segments 1 to 24 may be integrally formed.
In the first embodiment, the insulating material 32 is interposed between the connecting portions 35a and 35b arranged in the stacking direction, but a gap is formed without providing an insulating material between the connecting portions arranged in the stacking direction. The configuration may be changed.

  In the first and second embodiments, the main body portions 121 and 221 of the cores 112 and 212 and the main body cover portions 126 and 227 of the insulators 114, 115, 214, and 215 may be annular.

In the second embodiment, the insulators 214 and 215 may be omitted.
In the second embodiment, the claw portion 218 of the commutator 213 and the crossover wire 217 may be brought into contact with each other at the position of the gap portion S.

  In the second embodiment, after winding the windings 214a to 214h around the teeth portions 222a to 222h, the commutator 213 is press-fitted into the rotary shaft 111 so that the crossover wire 217 and the claw portion 218 are aligned. However, if the folded piece 218a of the claw portion 218 is a folded piece (not shown) that is bent inward (the opposite side of the core 212) in parallel with the axial direction, the windings 214a to 214h are wound around the teeth portions 222a to 222h. , The commutator 213 is press-fitted into the rotary shaft 111 so that the claw portions 218 of the commutator 213 are arranged between the adjacent teeth portions 222a to 222h, and then the connecting wire 217, the claw portions 218, The connecting wire 217 is wound around the teeth portions 222a to 222h so that they coincide with each other, and finally the connecting wire 217 and the claw portion 218 are contacted with the jigs 231 and 232 by fusing. (Welding) methods may be used. In this case, even when the axial support force between the rotating shaft 111 and the commutator 213 is weak, the jumper wire 217 functions to prevent the commutator 213 from coming off in the axial direction.

  -In the said 2nd Embodiment, although the number of the arm parts 224 is four and is the half of eight which is the number of the teeth parts 222a-222h, the arm part 224 is the teeth parts 222a-222h. It may be on the radial extension, and may be another number. That is, the portion of the crossover wire 217 that is located on the innermost radial direction is disposed between the adjacent tooth portions 222a to 222h. This is because the crossover 217 straddles the two teeth portions. Therefore, the arm part 224 should just be on the radial direction extension of the teeth parts 222a-222h used as the structure which avoids the position of the connecting wire 217 located in the innermost radial direction. For example, if all the arm portions 224 are arranged on the radial extension of all the tooth portions 222a to 222h, the number of the arm portions 224 is eight, which is the same number as the teeth portions, and is excellent in strength.

  In the third embodiment, the axial length L1 of the claw portions 343a to 343h is the distance along the axial direction between the bottom surface 326 of the storage hole 325 and the tip of the coil end portion 333 on the commutator 313 side. Although formed to a length of L2 or less, it may be formed to a length other than this.

  -In the said 3rd Embodiment, although the external shape of the main-body part 321 is formed in the regular octagon shape which the shape seen from the axial direction matched the storage hole 325, it is not restricted to this. For example, the outer shape of the main body 321 may be circular when viewed from the axial direction.

  In the third embodiment, the commutator 313 includes the rotating shaft 111 such that the claw portions 343a to 343h are positioned closer to the bottom surface 326 of the storage hole 325 than the tip of the coil end portion 333 on the commutator 313 side. It is fixed against. However, the commutator 313 is only required to be fixed to the rotating shaft 111 so that at least a part of the claw portions 343a to 343h is accommodated in the accommodation hole 325, and the claw portions 343a to 343h are disposed on the commutator 313 side. The end of the coil end portion 333 may protrude toward the anti-core 312 side.

  In the third embodiment, the storage hole 325 is formed in a regular octagonal shape having the same number of apexes X1 to X8 as the claw portions 343a to 343h, as viewed from the axial direction. Not exclusively. For example, the storage hole 325 may be formed so that the shape seen from the axial direction has a polygonal shape having more vertices than the number of the claw portions 343a to 343h. In this case, the apex located between the claw portions 343a to 343h is preferably arranged on the radially inner side as much as possible within the range in which the commutator 313 can be accommodated. Even if it comprises in this way, compared with the case where the accommodation hole 325 is a round hole which can accommodate claw part 343a-343h, the width | variety of the side wall part 327 of the accommodation hole 325 between adjacent claw parts 343a-343h is diameter. Widens toward the inside. Therefore, the armature 303 can be reduced in size without degrading the performance of the DC motor 101, and as a result, the DC motor 101 including the armature 303 can be reduced in size.

  In the third embodiment, prior to press-fitting of the commutator 313 into the rotating shaft 111, the windings 314a to 314h are wound in advance, and the position of the connecting wire 315 and the position of the claw portions 343a to 343h are The commutator 313 and the windings 314a to 314h may be electrically connected as the commutator 313 is press-fitted.

In the above embodiments, the number (eight) of the claw portions 38, 41, 218, 343a to 343h is an example.
In each of the above embodiments, a short-circuit wire may be used as the short-circuit member instead of the substantially flat short-circuit members 151 and 351, and the segments 1 to 24 having the same potential may be short-circuited by the short-circuit wire.

  In each embodiment, a plurality of anode side power supply brushes 106 and cathode side power supply brushes 107 may be provided. In this way, the supply of current to the armatures 103, 203, 303 is stabilized.

-In each said embodiment, the coupling | bonding aspect of the segments 1-24 and the short circuit members 151,351 is an example.
In each of the above embodiments, the angular interval at which the segments 1 to 24 are short-circuited by the short-circuit members 151 and 351 is an example.

  The motor 101 has an even number of poles P of 4 or more, a slot number N of N = P ± 2 (N = 6 when P = 4), and a commutator segment number S of S = N × (P / The concentrated winding motor of 2) may be used.

The schematic block diagram of the motor in 1st Embodiment. Sectional drawing of an armature. The top view of an armature. The top view of the core with which the insulator was mounted | worn. Sectional drawing of a commutator. The top view of a short circuit member. (A) (b) is explanatory drawing for demonstrating the manufacture aspect of an armature. Explanatory drawing for developing and explaining an armature planarly. The top view of the armature in 2nd Embodiment. The exploded perspective view of an armature. (A) (b) is explanatory drawing for demonstrating the manufacture aspect of an armature. Sectional drawing of a motor. The half sectional view of an armature. The top view of an armature core. Sectional drawing of a commutator. The enlarged view of the armature for showing a short circuit member. Explanatory drawing for developing and explaining an armature planarly. (A) and (b) are the conceptual diagrams which show the manufacturing method of an armature. Explanatory drawing for demonstrating a deformation | transformation form.

Explanation of symbols

  S: Gap, 1-24: Segment, 38, 41, 218, 343a-343h ... Claw, 101 ... Motor, 102 ... Stator, 103, 203, 303 ... Armature, 104 ... Yoke housing, 105 ... Permanent Magnets 106... Anode-side power supply brush 107. Cathode-side power supply brush 111... Rotating shaft 112, 212, 312, Core, 113, 213, 313, commutator, 114, 115, 214, 215, insulator 116a to 116h, 216a to 216h, 314a to 314h ... winding, 117, 217, 315 ... crossover, 121, 221, 321 ... main body, 122a to 122h, 222a to 222h, 322a to 322h ... teeth, 130a to 130h, 230a to 230h, 330a to 330h ... slot, 131 ... guide wall, 13 ... notches, 133 ... pedestal part, 134 ... positioning wall part, 151 ... short-circuit member, 223 ... inner wall surface, 224 ... arm part constituting the connecting part, 225 ... inner ring part constituting the connecting part, 231, 232 ... 313a ... end face, 325 ... storage hole, 326 ... bottom face, 333 ... coil end part, 351 ... short circuit member, L1 ... length along the axial direction of the claw part, L2 ... on the bottom face of the storage hole and the commutator side A distance along the axial direction from the tip of the coil end portion, L5... Distance between the core of the commutator and the end surface facing the axial direction and the bottom surface of the receiving hole, X1 to X8. ~ Y8: The apex of the outer shape of the main body.

Claims (6)

A commutator having a plurality of segments and claw portions projecting radially outward from the end portions of the segments;
A core having a main body portion and a plurality of teeth portions extending radially outward from the main body portion;
A winding wound continuously around each of the teeth of the core a plurality of times;
In an armature comprising the core and a rotating shaft to which the commutator is fixed,
The windings are sequentially wound around the teeth portions while crossing the adjacent teeth portions via a connecting wire extending in the circumferential direction.
The commutator claw portion and the winding are electrically connected by matching the position of the commutator claw portion with the position of the crossover line extending linearly in the circumferential direction in a tension state. Armature characterized by. The armature according to claim 1 ,
On the inner peripheral side of the core, a connecting portion connected to the rotating shaft and a gap portion penetrating in the axial direction are arranged,
The nail | claw part of the said commutator and the said crossover are contact | abutted in the axial direction extension position of the said space | gap part or this space | gap part, and are welded by the jig | tool inserted in this axial direction in the applicable contact part. Armature characterized by. The armature according to claim 1 or 2 ,
The winding includes coil end portions located at both axial ends of the teeth portion,
A housing hole is formed at one end in the axial direction of the main body portion and accommodates one axial end portion on the side where the claw portion of the commutator is formed,
The storage hole is formed in a polygonal shape in which the shape viewed from the axial direction coincides with the circumferential position of the apex and the circumferential position of the claw part, and accommodates at least a part of the claw part. Armature. In the armature as described in any one of Claims 1-3 ,
Provided on the core side end face of the commutator, comprising a short-circuit member that selectively short-circuits the plurality of segments,
The armature is characterized in that the claw portion extends from an outer periphery of the short-circuit member. A commutator having a plurality of segments and claw portions projecting radially outward from the end portions of the segments;
A core having a main body portion and a plurality of teeth portions extending radially outward from the main body portion;
A winding wound continuously around each of the teeth of the core a plurality of times;
In the manufacturing method of the armature provided with the rotating shaft to which the core is fixed,
In order to form a crossover in the circumferential direction, the windings are wound around each of the teeth portions sequentially over the adjacent teeth portions,
Thereafter, the commutator is fixed to the rotating shaft so that the position of the claw portion of the commutator and the position of the connecting wire extending linearly in the circumferential direction in a tension state are matched.
Thereafter, the claws of the commutator and the windings are electrically connected. A commutator having 24 segments and claw portions arranged at regular intervals protruding radially outward from the end portions of the segments;
The short-circuit member having the same potential as the segments at intervals of 120 degrees and connecting to the one claw portion from the same potential segment;
A core having a main body portion and eight teeth portions extending radially outward from the main body portion;
A winding wound continuously around each of the teeth of the core a plurality of times;
An armature comprising the core and a rotating shaft to which the commutator is fixed,
The winding extends from the one side in the circumferential direction of an arbitrary tooth portion, over the two adjacent tooth portions via a connecting wire extending in the same direction as the circumferential direction. To be wound around each of the teeth parts,
By aligning the position of the claw part of the commutator and the position of the crossover line extending linearly in the circumferential direction in a tension state, the claw part of the commutator and the winding are electrically connected. Armature
A DC motor comprising: a 6-pole magnet disposed on an outer peripheral side of the armature.

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