JP2004072920A - Armature in dynamo electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute an armature by externally engaging a core wound on a rotary shaft with a coil with the commutator so that terminating ends of the coil may not be projected outward. <P>SOLUTION: In order to fix externally the core 3 and the commutator 5 to the rotary shaft 2, a recess 5d of a segment 5b is disposed at a distal end side of an axially long core slot 3c in a hole direction, the terminating ends 4a of the coil 4 wound in a plurality of turns are drawn from the slots 3c in a substantially linear state between arbitrary slots 3c in a circumferential direction, and inserted and connected to the recess 5d of a commutator axially opposed to the slots 3c. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of an armature in a rotating electric machine configured as an electrical component and mounted on a vehicle or the like.
[0002]
[Prior art]
In general, in this type of rotating electric machine, a rotating shaft, a core formed with a plurality of slots extending in the axial direction on the outer circumference, and a commutator formed with a plurality of recesses for electrical connection on the outer circumference are externally fitted to each other. There is a configuration in which an end portion of a coil wound around a core slot a plurality of times is inserted into and connected to a commutator recess to form an armature. In such a motor, there is a fear that the coil of the armature may jump out due to centrifugal force when the rotating electric machine is driven. For this reason, the armature with the coil wound thereon is molded using a bulk mold compound (BMC), epoxy resin or the like, whereby the armature is inserted into the coil wound in the slot or the commutator recess. There is an arrangement in which the connected coil end portion is fixed so as to prevent the coil 4 from jumping to the outer diameter side and prevent the coil end portion 4a from being poorly connected.
[0003]
[Problems to be solved by the invention]
By the way, as shown in FIG. 5, in the conventional armature, after a coil 8 is wound around an arbitrary core slot 3c a plurality of times, a terminal 8a of the coil 8 is moved from a commutator 5 side end of the core slot 3c. The drawer is formed by inserting and connecting the terminal portion 8a to a concave portion 5d formed in the commutator 5. In this case, the core slot 3c and the commutator recess 5d are formed so as to face each other in the axial direction. Conventionally, the coil end portion 8a is pulled out from the core slot 3c and then pulled out. The commutator recess 5d is displaced in the circumferential direction from the core slot 3c, and more specifically, is inserted into the recess 5d two circumferentially ahead of the recess 5d axially facing any core slot 3c. For this reason, the coil end portion 8a is in a state of being bent at two positions, the end portion of the core slot 3c and the concave portion 5d, and a force in the outer diameter direction is generated at the coil end portion 8a by so-called springback. ing. Further, since the coil end portion 8a linearly bridges from the end of the core slot 3c to the commutator recess 5d which is displaced in the axial direction, the intermediate portion of the coil end portion 8a is close to the rotation axis. In some cases, the outer periphery is already wound around the core slot 3c, and may come into contact with the wound coil 8 projecting from the end of the core slot in a pressing manner. In this case, the wound coil 8 acts like a fulcrum of leverage, and the spring back of the coil end portion 8a is further assisted, and the coil 8 may jump out to the outer diameter side. Further, the coil 8 may be loosened in a state where the coil end portion 8a is inserted into the concave portion 5d, but the slack is absorbed at the bent coil end portion 8a, so that the coil back is incompatible with the spring back. In addition, it is easy to jump out to the outer diameter side. In the case where the coil end portion 8a protrudes to the outer diameter side, when the molding process is performed and the outer periphery of the core 3 is cut in the finishing process, the coil terminal portion that protrudes to the outer diameter side. There is a problem that the portion 8a may be damaged and the yield is reduced, and there is a problem to be solved by the present invention.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above-described circumstances, and has been created with the object of solving these problems.It has a core in which a plurality of slots that are long in the axial direction are formed on the outer periphery, and an electric connection is formed on the outer periphery. A commutator having a plurality of recesses formed outside is fitted around the rotating shaft, and the terminal end of the coil wound a plurality of times between any core slots in the circumferential direction is inserted and connected to the commutator recess to form an armature. In doing so, the coil end portion pulled out from the core slot is inserted and connected to the commutator recess so as to be drawn out substantially linearly and not pushed by the wound coil projecting from the core slot.
By doing so, the amount of bending of the coil end portion can be reduced, and the coil end portion is no longer pushed by the wound coil projecting from the core slot, and there is a problem that the coil end portion jumps out to the outer diameter side. Can be prevented.
In this case, the coil end portion drawn from the core slot of the present invention may be inserted into a commutator recess axially opposed to the core slot.
Further, in this case, the core slot of the present invention may be formed in a positional relationship of skew with respect to the rotation axis, and the commutator recess may be formed at the hole-direction tip of the core slot. it can.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS.
In the drawings, reference numeral 1 denotes an armature that constitutes a rotating electric machine. The armature 1 includes a rotating shaft 2, a core 3 that is externally fitted and fixed to the rotating shaft 2, and the core 3 that will be described later. And a winding start end of the coil 4 wound around the core 3 and fixed at one end side of the outside fitting portion of the core 3 of the rotating shaft 2. A commutator 5 is provided which is electrically connected to a terminal end 4a which is a winding end.
[0006]
The core 3 is formed by laminating a plurality of thin ring-shaped core plate members 3a in the axial direction, and a plurality of teeth 3b are radially formed on the outer diameter side of each core plate member 3a. Due to the gap between adjacent teeth, a plurality of axially oriented slots 3c, which are long spaces in the axial direction, are formed in the outer periphery of the core 3 in the circumferential direction.
Incidentally, the respective core plate members 3a are laminated so that adjacent ones in the axial direction are slightly displaced from each other in the circumferential direction, and as a result, as shown in FIG. Skew.
[0007]
On the other hand, the commutator 5 is a conductive member arranged to cover the ring-shaped resin material portion 5a and the outer peripheral surface and one end side surface (side surface not facing the core 3) of the resin material portion 5a. A plurality of segment portions 5b are formed in the circumferential direction. Slits 5c are formed between the segment portions 5b, and the adjacent segment portions 5b are insulated. . Here, the same number of the segment portions 5b as the number of the core slots 3c are formed, and concave portions 5d are formed on the outer peripheral surface of each of the segment portions 5b so as to be recessed toward the inner diameter side with the core 3 side opened. Are formed, and the winding start end of an arbitrary coil 4 is inserted and connected to the inner diameter side, which is the inner side of the groove of the concave portion 5d. The terminal 4a of the coil 4 wound around the core slot 3c is set so as to be inserted and connected, so that power is supplied to each coil 4 via the segment 5b. It is set as follows.
The commutator 5 is arranged such that the recess 5d of each segment 5b and the core slot 3c face the direction of the rotation shaft 2, that is, the skew direction of the core slot 3c.
[0008]
As described above, each coil 4 is inserted and connected at the winding start end to the inner diameter side of the commutator concave portion 5d, and after being wound a plurality of times between any two core slots 3c in the circumferential direction, the coil 4 ends. The portion 4a is pulled out from the end of the core slot 3c on the side of the commutator 5 and inserted into the outer diameter side of the concave portion 5d of the commutator 5. At this time, the coil end portion 4a is pulled out. It is set so as to be inserted and connected to the commutator recess 5d located opposite to the hole-direction front end side of the core slot 3c. As a result, the coil end portion 4a drawn out of the core slot 3c is drawn out substantially linearly along the axial direction, and is set so as not to be bent.
Reference numeral 6 denotes a brush which is in sliding contact with one side surface of one end of the commutator segment 5b in a pressing manner. The brush 6 can freely move in and out of the brush holder 7 arranged close to the commutator 5 in the axial direction of the rotary shaft 2. Held in state.
[0009]
In the embodiment of the present invention configured as described above, any core slot 3c and any commutator recess 5d are formed so as to be substantially opposed to each other in the direction of the rotation axis 2 which is the hole direction of the core slot 3c. The terminal 4a of the coil 4 pulled out from the arbitrary core slot 3c is inserted and connected to a commutator recess 5d axially facing the core slot 3c. For this reason, the coil end portion 4a drawn out from the core slot 3c is drawn out linearly along the direction of the rotation axis 2, so that the coil end portion 4a does not bend, and a problem due to springback is prevented. Can be avoided.
Further, in this case, since the coil end portion 4a is extended along the outer peripheral surface of the core 3, the coil end portion 4a is bent at the end of the core slot like the conventional coil end portion, and is rotated in the circumferential direction. As in the case of insertion into the commutator concave portion which is misaligned, the coil end portion located between the core slot end portion and the commutator concave portion is stretched like a chord with respect to an arc, and the intermediate portion of the coil end portion 4a is There is no such thing as approaching the rotating shaft 2. As a result, the coil end portion 4a can be separated from the coil 4 on the inner diameter side that has already been wound, and the coil end portion 4a is pushed out to the outer diameter side by the wound coil 4 on the inner diameter side. There is no problem, and it is possible to prevent the coil end portion 4a from jumping out.
[0010]
Moreover, in this case, the coil 4 is linearly pulled out from the core slot 3c and reaches the commutator recess 5d from the other end of the core slot 3c in a state where there is no bent portion. For this reason, when the coil end 4a is inserted and connected to the commutator recess 5d, even if the coil end 4a becomes loose, there is no springback as described above. In this case, a long stroke from the other end of the core slot 3c to the commutator recess 5d is absorbed, so that a problem such as jumping to the outer diameter side can be avoided.
[0011]
Moreover, in this embodiment, the core 3 is formed in a positional relationship of skewing the core slot 3c with respect to the rotation shaft 2 in consideration of efficiency and the like. In this case, the commutator recess 5d is oriented in the hole direction of the core slot 3c. Since the coil 4 is disposed so as to be located on the distal end side, the terminal 4a of the coil 4 can be drawn out linearly, and the coil terminal 4a can be kept straight.
As a result, when the armature 1 thus formed is molded using an epoxy resin or a bulk mold compound, and then the outer peripheral surface of the armature 1 is cut, the coil projecting to the outer diameter side is cut. 4 can be prevented from being damaged, and the product yield can be improved.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view of an armature.
FIGS. 2A and 2B are a rear view and a front view, respectively, of a commutator.
FIGS. 3A and 3B are a rear view and a partial cross-sectional side view of a brush holder.
FIG. 4 is a perspective view of a main part of the armature.
FIG. 5 is a perspective view of a main part of an armature in a conventional example.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 armature 2 rotating shaft 3 core 3 c core slot 4 coil 4 a coil end 5 commutator 5 d commutator recess

Claims (3)

A core having a plurality of axially long slots formed on the outer circumference and a commutator having a plurality of recesses formed on the outer circumference for electrical connection are externally fitted to the rotating shaft, and are wound multiple times between arbitrary core slots in the circumferential direction. In forming the armature by inserting and connecting the terminal end of the mounted coil to the commutator recess, the coil terminal end pulled out from the core slot is drawn out in a substantially straight line, and the wound coil protrudes from the core slot. Armature in a rotating electric machine that is inserted and connected to the commutator recess so as not to be pressed by the armature. The armature according to claim 1, wherein the coil end portion drawn from the core slot is inserted into a commutator recess axially opposed to the core slot. 3. The armature according to claim 1, wherein the core slot is formed in a positional relationship skewed with respect to the rotation axis, and the commutator recess is formed at a tip of the core slot in the hole direction. 4.

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