JP3816783B2 - Rotating machine armature - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armature of a rotary electric machine represented by a DC motor, and more particularly to an insulating structure between a core and a winding constituting the armature of the rotary electric machine.
[0002]
[Prior art]
Conventionally, various methods for interposing an insulating resin molded product (core insulator) between a core and a winding are proposed as a method for insulating a core and a winding constituting an armature (armature) of a DC motor. Yes.
[0003]
For example, as shown in FIG. 6, the armature 100 of the DC motor includes a laminated core 110 that rotates integrally with a rotating shaft, and a pair of core insulators 120 that cover the laminated core 110 from both sides in the axial direction. . Specifically, as shown in FIG. 7A, each core insulator 120 includes a bobbin portion 121 that covers the teeth 111 that are radially extended from the central portion of the laminated core 110 along the axial direction, An extension portion 122 that covers the protrusion 111a that extends in the circumferential direction from the distal end portion of the tooth 111 on the outer diameter side is provided along the axial direction.
[0004]
As a result, as shown in FIG. 7B, when the windings 130 are wound around the teeth 111 of the laminated core 110 covered with the core insulators 120, electrical power is generated between the teeth 111 and the windings 130 by the core insulators 120. Insulated. The extending portion 122 of each core insulator 120 is provided to prevent the winding 130 from directly contacting the protrusion 111a when the winding 130 is wound around the tooth 111 of the laminated core 110. As a result, when the winding 130 is wound around the teeth 111 of the laminated core 110, the insulating coating (for example, enamel) applied to the surface of the winding 130 is not likely to be damaged by the protrusion 111a.
[0005]
[Problems to be solved by the invention]
However, as shown in FIG. 8A, when the winding 130 is wound around the teeth 111 of the laminated core 110, the tightening force of the winding 130 acts with the corner portion 121a of the core insulator 120 as a fulcrum. . Therefore, the bobbin portion 121 of the core insulator 120 that is in close contact with the tooth 111 rotates to the slot 112 side, which is a space between adjacent teeth 111, with the corner portion 121a serving as a fulcrum, and is separated from the tooth 111. Then, as shown in FIG. 8B, as the bobbin portion 121 is separated from the tooth 111, the extending portion 122 of the core insulator 120 that is in close contact with the protrusion 111a of the tooth 111 is similarly formed as the protrusion 111a. Separate from.
[0006]
Accordingly, the gap S1 between the protrusion 111a of the tooth 111 and the extending portion 122 of the core insulator 120 is widened, and the gap S2 between the insertion opening of the winding 130, that is, the extending portion 122 is narrowed. Then, when winding the winding 130, it becomes difficult to insert the winding 130 into the slot 112 from the gap S2, and the possibility that the winding 130 enters the gap S1 is increased. As a result, if the winding 130 enters the gap S1, the insulating coating applied to the surface of the winding 130 may be damaged by the protrusion 111a.
[0007]
Therefore, in order to prevent the winding 130 from entering the gap S1, a guide member 140 is provided in the winding device, the guide member 140 is disposed in the insertion path of the winding 130, and the winding 130 is removed from the gap S2. A configuration that reliably guides into the slot 112 is conceivable. However, such a configuration is not preferable because the equipment configuration for winding the winding 130 is complicated and expensive. Unlike the configuration shown in FIG. 7A, the winding 111 is wound around the laminated core 110 by the core insulator 120 that is not provided with the extending portion 122, and the winding 111 is wound around. It is necessary to provide the guide member 140 so as not to damage the wire 130, and there is a problem similar to the above.
[0008]
The present invention has been made paying attention to such problems, and its purpose is not only to electrically insulate between the core and the winding, but also to protect the winding with an inexpensive configuration. An object of the present invention is to provide an armature of a rotating electric machine that can be used.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, a core that rotates integrally with the rotary shaft, a pair of core insulators that cover the core from both sides in the axial direction, and the core insulators are used. An armature of a rotating electrical machine, wherein the core insulator is electrically insulated between the core and the winding by each core insulator interposed between the core and the core. A bobbin portion that covers the teeth radially extending from the center portion of the teeth along the axial direction, and a protrusion that extends from the distal end portion on the outer diameter side of the teeth in the circumferential direction is covered along the axial direction. The bobbin portion is formed with a protruding portion toward the slot, which is a space between adjacent teeth.The protruding portion has a protruding amount toward the slot side that increases from the inner diameter side to the outer diameter side, and the bobbin portion is configured to be thicker by the amount of the protruding portion. The coil insulator has a protruding amount that comes into contact with the winding at the time of winding, and is pressed toward the non-slot side by the tightening force of the winding, thereby preventing the extension portion of the core insulator from being separated from the protrusion..
[0010]
Therefore, according to the first aspect of the present invention, the core teeth are covered by the bobbin portion of each core insulator along the axial direction, and the protrusions of the core teeth are aligned with each core insulator along the axial direction. It is covered by the extension part. As a result, when a winding is wound around a core tooth covered with each core insulator, the tooth and the winding are electrically insulated by each core insulator.
[0011]
In particular, the bobbin portion of each core insulator is formed with a protrusion toward the slot. For this reason, when winding the windings around the core teeth via the respective core insulators, the protruding portions of the respective core insulators are pressed against the anti-slot side, that is, the teeth side by the tightening force of the windings. Therefore, the bobbin portion of each core insulator is prevented from being separated from the teeth, and the extended portion of each core insulator is prevented from being separated from the protrusion. As a result, when winding the winding, it is less likely that the winding will enter the gap between the teeth projection and the extension of each core insulator, and the surface of the winding may be damaged by the teeth projection. Is reduced.
[0012]
In addition, since the structure in which the protrusions are formed on the bobbin portions of the core insulators in this manner reduces the possibility that the surface of the winding is damaged by the protrusions of the teeth, unlike the conventional case, when winding the windings Needless to say, the guide member 140 need not be provided.
[0014]
  AlsoThe protrusion formed on the bobbin portion of each core insulator has a sufficient protrusion amount to contact the winding when the winding is wound. For this reason, the protruding portions of the core insulators are reliably pressed to the anti-slot side, that is, the teeth side by the tightening force of the winding acting from the slot side to the anti-slot side.
[0016]
Since the teeth extend radially from the central portion of the core, the distance between the adjacent teeth is longer from the inner diameter side toward the outer diameter side, and more windings can be wound. Even if the winding is wound, there is generally a slight space between the adjacent teeth on the outer diameter side where the winding is not wound. Therefore, as in the invention described in claim 3, the space between adjacent teeth is reduced in the slot by increasing the protruding amount of the protruding portion toward the slot side from the inner diameter side toward the outer diameter side. I am letting. However, the space is merely reduced, and the winding amount of the winding does not decrease.
[0017]
Rather, in the conventional configuration in which the projecting portion is not formed on the bobbin portion of the core insulator, the winding is wound in the slots so as to be biased toward the adjacent teeth, and the winding is biased in the both sides. Space may be formed between the lines. And when there are a mixture of slots (with space) where the windings are biased on both sides and slots (with no space) where the windings are wound without biasing on both sides, Rotation imbalance amount tends to increase. On the other hand, according to the third aspect of the present invention, by increasing the protruding amount of the protruding portion toward the slot side from the inner diameter side toward the outer diameter side, between adjacent teeth in the slot. Since the space is reduced, the windings are not biased to both sides. Therefore, unlike the conventional configuration, the slot with space and the slot without space are not mixed, and the rotation balance of the armature is stabilized.
[0018]
  Claim2In the invention described in claim1In the armature of the rotating electric machine described above, the core insulator includes a cover portion that covers one side surface of both radial side surfaces of the core, and the bobbin portion and the extension portion extend along the axial direction from the cover portion. The cover portion, the bobbin portion, and the extending portion constitute a tooth receiving portion including a protrusion, and the bobbin portion and the extending portion protrude at the end opposite to the cover portion. Forming the insertion opening of teeth includingThe protruding portion is formed on the bobbin portion corresponding to the insertion port..
[0019]
  Therefore, the claims2According to the invention described in (1), the one radial side surface of the core is covered with the cover portion of each core insulator. As a result, when the winding is wound around the core teeth covered with each core insulator, the teeth and the winding are reliably insulated by each core insulator.
[0020]
  According to a third aspect of the present invention, in the armature of the rotating electric machine according to the second aspect, the inner surface of the bobbin portion corresponding to the insertion port is chamfered toward the slot side.
  Therefore, according to the invention of claim 3,The inner surface of the bobbin portion of each core insulator corresponding to the insertion port of the teeth including the core protrusion is chamfered toward the slot side, that is, the anti-teeth side. In other words, in each core insulator, since the insertion opening of the teeth including the protrusion of the core is widened, each core insulator can be easily attached to the core.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which an armature of a rotating electrical machine according to the present invention is embodied in an armature of a DC motor will be described with reference to the drawings.
[0022]
As shown in FIG. 1, the DC motor 1 includes a motor housing 2, and the motor housing 2 includes a bottomed cylindrical yoke 3 and an end frame 4. A bearing recess 5 is formed in the bottom of the yoke 3, and a bearing 6 is fixed to the bearing recess 5. A pair of magnets 7 and 8 are fixed on the inner surface of the yoke 3. A bearing recess 9 is formed in the inner side surface 4 a of the end frame 4 that closes the opening of the yoke 3, and a bearing 10 is fixed to the bearing recess 9.
[0023]
An armature 15 is accommodated in a space formed by the yoke 3 and the end frame 4, and a rotating shaft 16 of the armature 15 is rotatably supported by the bearings 6 and 10. A commutator 17 is fixed to the rotating shaft 16, and a brush 18 is slidably contacted with the commutator 17. As a result, in the DC motor 1, as the commutator 17 rotates, the external current is mechanically rectified by the brush 18 and supplied to the winding 19 wound around the armature 15.
[0024]
Next, the configuration of the armature 15 will be described mainly using the exploded perspective view shown in FIG.
As shown in FIG. 2, the armature 15 includes a laminated core 20 that rotates integrally with the rotary shaft 16 shown in FIG. 1, and a pair of layers that covers the laminated core 20 from both sides in the axial direction (the commutator side and the anti-commutator side). And a core insulator 30. The laminated core 20 is composed of a plurality of core sheets 21, and each core sheet 21 is a plurality of teeth pieces 21 b (radially formed) extending radially from the central portion where the holes 21 a are formed and at equal angular intervals. In the embodiment, eight are provided at intervals of 45 degrees. And the protrusion piece 21c extended along the circumferential direction is formed in the front-end | tip part by the side of the outer diameter of each teeth piece 21b. Each hole 21 a constitutes a through hole 20 a of the rotating shaft 16 in the laminated core 20, each tooth piece 21 b constitutes a tooth 20 b in the laminated core 20, and each protruding piece 21 c is a protrusion 20 c in the laminated core 20. The space between adjacent teeth 20b constitutes a slot 20d in the laminated core 20.
[0025]
Each core insulator 30 is a molded product made of an insulating thermoplastic resin, and includes a cylindrical portion 31 fixed to the rotating shaft 16 shown in FIG. That is, in this embodiment, although the laminated core 20 can rotate with respect to the rotating shaft 16, each core insulator 30 attached to the laminated core 20 is fixed to the rotating shaft 16. As a result, the laminated core 20 rotates integrally with the rotating shaft 16. The laminated core 20 and each core insulator 30 may be configured to be fixed to the rotating shaft 16 or the stacked core 20 may be configured to be fixed to the rotating shaft 16. Also in this case, the laminated core 20 rotates integrally with the rotating shaft 16.
[0026]
Each of the core insulators 30 includes a cover portion 32 that covers one side surface of the radial side surfaces L and R of the laminated core 20. Specifically, the cover portion 32 of the core insulator 30 on the commutator 17 side covers the side surface L of the laminated core 20, and the cover portion 32 of the core insulator 30 on the anti-commutator 17 side covers the side surface R of the laminated core 20. To do. Further, each core insulator 30 includes a bobbin portion 33 that covers the teeth 20b of the laminated core 20 along the axial direction, and an extending portion 34 that covers the protrusions 20c of the laminated core 20 along the axial direction. ing. The end face T on the outer diameter side of the laminated core 20 functions as a path for the magnetic flux from the magnets 7 and 8 shown in FIG. 1, and therefore the end face T is set to each core so as not to adversely affect the magnetic flux. A configuration not covered by the insulator 30 is preferable.
[0027]
Next, a characteristic configuration of each core insulator 30 will be described mainly with reference to cross-sectional views of relevant parts shown in FIGS. 3 (a) and 3 (b).
As shown in FIGS. 3A and 3B, each core insulator 30 has a cover portion 32, a bobbin portion 33, and an extension portion 34, and a receiving portion 30 a for the teeth 20 b including the protrusion 20 c of the laminated core 20. Is formed. As shown in FIG. 2, an insertion port 30b of the tooth 20b including the protrusion 20c is formed by the end of the bobbin portion 33 and the extending portion 34 on the side opposite to the cover portion 32.
[0028]
Further, as a characteristic configuration of each core insulator 30, the bobbin portion 33 is formed with a protruding portion 35 directed toward the slot 20d. Specifically, the protruding portion 35 is formed so that the protruding amount toward the slot 20d increases as it goes from the inner diameter side to the outer diameter side. In this embodiment, the protruding portion 35 moves from the inner diameter side to the outer diameter side. As the protrusion amount increases linearly, a so-called tapered shape is formed (see FIG. 3A). In particular, the portion of the protrusion 35 on the outermost diameter side has a sufficient protrusion amount to contact the winding 19 when the winding 19 is wound. Further, a chamfer 35a is provided on the inner surface on the outer diameter side of the bobbin portion 33 (specifically, the protruding portion 35) corresponding to the insertion port 30b shown in FIG. 2 toward the slot 20d side. In the present embodiment, the chamfer 35a is tapered such that the distance from the tooth 20b increases linearly toward the opposite side of the cover portion 32 (see FIG. 3B).
[0029]
As described above, according to the present embodiment, the following operations and effects can be obtained.
(1) The teeth 20b of the laminated core 20 are covered by the bobbin portion 33 of each core insulator 30 along the axial direction, and the protrusions 20c of the teeth 20b of the laminated core 20 are covered with the core insulators 30 along the axial direction. The extension 34 is covered. As a result, when the windings 19 are wound around the teeth 20b of the laminated core 20 covered with the core insulators 30, the teeth 20b and the windings 19 can be electrically insulated by the core insulators 30. .
[0030]
(2) In particular, the bobbin portion 33 of each core insulator 30 is formed with a protruding portion 35 toward the slot 20d. Therefore, when the windings 19 are wound around the teeth 20 b of the laminated core 20 via the core insulators 30, the protruding portions 35 of the core insulators 30 are anti-slot 20 d side, that is, the teeth, due to the tightening force of the windings 19. It is pressed to the 20b side. Accordingly, it is possible to prevent the bobbin portion 33 of each core insulator 30 from being separated from the teeth 20b and the extending portion 34 of each core insulator 30 from being separated from the protrusion 20c. As a result, when winding the winding 19, the possibility that the winding 19 enters the gap between the protrusion 20 c of the tooth 20 b and the extending portion 34 of each core insulator 30 is reduced, and the surface of the winding 19 is not exposed to the teeth. The risk of being damaged by the protrusion 20c of 20b is reduced. Therefore, the winding 19 can be protected.
[0031]
(3) In addition, the configuration in which the protruding portion 35 is formed on the bobbin portion 33 of each core insulator 30 reduces the possibility that the surface of the winding 19 is damaged by the protrusion 20c of the tooth 20b. Needless to say, it is not necessary to provide the guide member 140 shown in FIG. Therefore, the laminated core 20 and the winding 19 can be electrically insulated, and the winding 19 can be protected with an inexpensive configuration.
[0032]
(4) The protruding portion 35 formed on the bobbin portion 33 of each core insulator 30 has a protruding amount sufficient to contact the winding 19 when the winding 19 is wound. Therefore, the projecting portion 35 of each of the core insulators 30 is reliably pressed to the anti-slot 20d side, that is, the teeth 20b side by the tightening force of the winding 19 acting from the slot 20d side to the anti-slot 20d side. Therefore, the possibility that the winding 19 enters the gap between the protrusion 20c of the tooth 20b and the extending portion 34 of each core insulator 30 is further reduced, and the winding 19 can be reliably protected.
[0033]
(5) Since the teeth 20b are radially formed from the central portion of the laminated core 20, the distance between the adjacent teeth 20b increases as the distance from the inner diameter side toward the outer diameter side increases. Can be wound. Even if the winding 19 is wound, there is generally a slight space between the adjacent teeth 20b on the outer diameter side where the winding 19 is not wound. Therefore, in the present embodiment, the space between the adjacent teeth 20b is reduced in the slot 20d by increasing the protrusion amount of the protrusion 35 toward the slot 20d side from the inner diameter side toward the outer diameter side. Yes. However, the space is merely reduced, and the winding amount of the winding 19 is not reduced. Accordingly, the winding 19 can be protected while maintaining the conventional winding amount.
[0034]
(6) Rather, in the conventional configuration in which the protruding portion 35 is not formed on the bobbin portion 33 of the core insulator 30, the winding 19 is biased and wound around the adjacent teeth 20b in the slot 20d. There is a possibility that a space is formed between the windings 19 wound side by side. When the slot 20d (with a space) wound with the winding 19 biased on both sides and the slot 20d (without a space) wound with the winding 19 unbiased on both sides are mixed The rotational unbalance amount of the armature 15 tends to increase. On the other hand, in this embodiment, the space between the adjacent teeth 20b is increased in the slot 20d by increasing the protrusion amount of the protrusion 35 toward the slot 20d side from the inner diameter side toward the outer diameter side. Since it is decreased, the winding 19 is not biased to both sides. Therefore, unlike the conventional configuration, the slot 20d with space and the slot 20d without space are not mixed, and the rotation balance of the armature 15 can be stabilized.
[0035]
(7) One radial side surface (side surface L or side surface R) of the laminated core 20 is covered with the cover portion 32 of each core insulator 30. In particular, in this embodiment, each core insulator 30 covers the laminated core 20 from both sides in the axial direction. In other words, the side surfaces L and R of the laminated core 20 are covered by the cover portion 32 of each core insulator 30. As a result, when the windings 19 are wound around the teeth 20 b of the laminated core 20 covered with the core insulators 30, the teeth 20 b and the windings 19 can be reliably insulated by the core insulators 30.
[0036]
(8) A chamfer 35a is applied to the inner surface of the bobbin portion 33 of each core insulator 30 corresponding to the insertion port 30b of the tooth 20b including the protrusion 20c of the laminated core 20 toward the slot 20d, that is, the counter teeth 20b. ing. In other words, in each core insulator 30, since the insertion port 30b of the teeth 20b including the protrusion 20c of the laminated core 20 is widened, each core insulator 30 can be easily attached to the laminated core 20.
[0037]
(9) The chamfer 35a is given only to the inner surface on the outer diameter side of the bobbin portion 33 (specifically, the protruding portion 35) corresponding to the insertion port 30b. In other words, the chamfer 35a is given only to the portion where the protruding amount of the protruding portion 35 is large. Therefore, the chamfer 35 a slightly reduces the substantial protrusion amount at the protrusion 35 and slightly decreases the strength, but does not lead to the core insulators 30 being damaged by the tightening force of the winding 19. Therefore, each core insulator 30 can satisfy both the ease of mounting on the laminated core 20 and the strength against the tightening force of the winding 19.
[0038]
(10) In addition, since the projecting portion 35 is not formed in the extending portion 34, the gap between the extending portions 34, that is, the insertion opening of the winding wire 19 is suppressed as much as possible in the slot 20d. The Therefore, it is possible to substantially maintain the ease of winding of the winding wire 19 while protecting the winding wire 19 with the extending portion 34.
[0039]
(11) In the conventional configuration in which the protruding portion 35 is not formed, the portion where the winding 19 is in contact with each core insulator 30 is formed between the cover portion 32 and the bobbin portion 33 per one turn of the winding 19. There are only four places of the connection part. On the other hand, in the configuration of the present embodiment in which the projecting portions 35 are formed, the winding 19 contacts the projecting portions 35 in addition to the above four locations (total of 8 locations). For this reason, it is difficult for “loosening” to occur in the winding wire 19, and the rotation balance of the armature 15 can be stabilized from this. In addition, in order to protect the surface of the coil | winding 19, in each core insulator 30, the structure which forms a taper surface or a curved surface in the part which the coil | winding 19 contacts is preferable.
[0040]
(12) Each core insulator 30 is a molded product using a mold. Here, in the conventional configuration in which the protruding portion 35 is not formed, the thickness of the bobbin portion 33 is thin, and the bobbin portion 33 cannot be pressed by the push pin provided in the mold. In other words, only a relatively wide area such as the inner surface of the cover portion 32 can be pressed. For this reason, the number of extrusion pins that can be used is small and the stress is not dispersed so much that there is a risk of deformation when the molded product is released. On the other hand, in the configuration of the present embodiment in which the protruding portion 35 is formed, the bobbin portion 33 is configured to be thick by an amount corresponding to the protruding amount of the protruding portion 35. Therefore, it is possible to release the molded product by pressing the extrusion pin also on the protruding portion 35. Therefore, since the stress is dispersed as compared with the conventional configuration, there is no possibility that the molded product is deformed.
[0041]
(13) In addition, since the bobbin portion 33 is formed with a thickness corresponding to the protrusion amount of the protrusion portion 35, the insulation distance between the winding 19 and the teeth 20b depends on the protrusion amount of the protrusion portion 35. become longer. Therefore, compared with the conventional structure in which the protrusion part 35 is not formed, between the coil | winding 19 and the teeth 20b can be insulated reliably. In addition, since insulation improves by the protrusion part 35 in this way, the structure which changed the shape of each core insulator 30 so that the space | interval between each core insulator 30 becomes wide, so that the protrusion amount of the protrusion part 35 is long. It is good. Specifically, the interval between the core insulators 30 may be widened from H1 shown in FIG. 3 (b) to H2 shown in FIG. 3 (c). Incidentally, when the configuration of each core insulator 30 is changed as described above, the cost for the molding material and the mold can be reduced. Needless to say, the insulation in the conventional configuration can be maintained.
[0042]
In addition, the said embodiment can also be changed and actualized as follows.
As shown in FIG. 4, the protruding portion 35 toward the slot 20 d may be formed only on the outer diameter side of the central portion of the bobbin portion 33 in the radial direction. With this configuration, when winding the winding 19, the protruding portion 35 formed only on the outer diameter side of the central portion in the radial direction of the bobbin portion 33 causes the teeth to be formed by the tightening force of the winding 19. It is pressed to the 20b side. The projecting portion 35 is formed in the vicinity of the extending portion 34 that covers the protrusion 20c that extends in the circumferential direction from the distal end portion on the outer diameter side of the tooth 20b along the axial direction.
[0043]
That is, when winding the winding 19, the protruding portion 35 formed in the vicinity of the extending portion 34 is pressed toward the teeth 20 b by the tightening force of the winding 19. Therefore, in particular, the extended portion 34 is reliably prevented from being separated from the protrusion 20c, and the possibility that the surface of the winding 19 is damaged by the protrusion 20c of the tooth 20b is further reduced. Therefore, the winding 19 can be protected. In addition, since the extended portion 34 is reliably prevented from being separated from the protrusion 20c, so-called “backlash” during the rotation of the armature 15 is suppressed as much as possible, and the stability of the rotation balance of the armature 15 can be improved. Further, since the protruding portion 35 is not formed on the inner diameter side of the central portion in the radial direction in the bobbin portion 33, the windings 19 are wound as much as the protruding portion 35 is not formed. Can do. That is, the space factor of the winding 19 can be improved. In addition, either the structure which gives the chamfer 35a shown to Fig.3 (a), (b), or the structure which does not give the chamfer 35a may be sufficient.
[0044]
As shown in FIG. 5, the chamfer 35 a applied to the inner surface on the outer diameter side, which can be formed by increasing the thickness of the protruding portion 35, extends toward the side opposite to the cover portion 32. It is good also as a structure made into the curved surface form which the separation distance of becomes long curvilinearly. If comprised in this way, at the time of mounting | wearing with each core insulator 30 with respect to the laminated core 20, the frictional force which acts between the laminated core 20 and each core insulator 30 is small. Therefore, each core insulator 30 can be smoothly attached to the laminated core 20 by so-called “slip”. And since it can mount | wear smoothly like this, an assembly | attachment property can be improved at the time of mounting | wearing.
[0045]
-You may comprise each core insulator 30 with a thermosetting resin, a coated steel plate etc. which have insulation.
Furthermore, the technical idea grasped from the above embodiment will be described below together with the effects thereof.
[0046]
  ・The projecting portion toward the slot side is formed only on the outer diameter side of the central portion in the radial direction of the bobbin portion covering the core teeth along the axial direction.It was.With this configuration, when winding the winding, the protruding portion formed only on the outer diameter side of the central portion in the radial direction in the bobbin portion is pressed toward the teeth side by the tightening force of the winding. The The projecting portion is formed in the vicinity of the extending portion that covers the protrusion formed in the circumferential direction from the distal end portion on the outer diameter side of the tooth along the axial direction. That is, when winding the winding, the protruding portion formed in the vicinity of the extending portion is pressed to the teeth side by the tightening force of the winding. Therefore, in particular, the extension portion is reliably prevented from being separated from the protrusion, and the possibility that the surface of the winding is damaged by the protrusion of the tooth is further reduced. Therefore, the winding can be protected.
[0047]
【The invention's effect】
  Since this invention is comprised as mentioned above, there exist the following effects.
  eachClaimIn termsAccording to the described invention, it is possible to protect the winding with an inexpensive configuration as well as to electrically insulate between the core and the winding.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a DC motor provided with an armature according to an embodiment.
FIG. 2 is an exploded perspective view showing a configuration of an armature.
FIG. 3 is a cross-sectional view of a main part of the armature.
FIG. 4 is a cross-sectional view of a main part of an armature according to another embodiment.
FIG. 5 is a cross-sectional view of a main part of an armature according to another embodiment.
FIG. 6 is an exploded perspective view showing a configuration of a conventional armature.
FIG. 7 is a cross-sectional view of a conventional armature.
FIG. 8 is a cross-sectional view showing the operation of a conventional armature.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... DC motor as rotary electric machine, 15 ... Armature as armature, 16 ... Rotating shaft, 19 ... Winding, 20 ... Laminated core as core, 20b ... Teeth, 20c ... Projection, 20d ... Slot, 30 ... Core Insulator, 30a ... receiving part, 30b ... insertion port, 32 ... cover part, 33 ... bobbin part, 34 ... extending part, 35 ... projecting part, 35a ... chamfering, L ... side face, R ... side face.

Claims (3)

A core that rotates integrally with the rotating shaft, a pair of core insulators that cover the core from both sides in the axial direction, and windings that are wound around the core via the core insulators. In an armature of a rotating electric machine that electrically insulates between a core and a winding by each core insulator interposed in the
The core insulator includes a bobbin portion that covers a tooth extending radially from the central portion of the core along the axial direction, and a protrusion that extends in a circumferential direction from a distal end portion on the outer diameter side of the tooth. An extension portion covering along the axial direction,
The bobbin portion is formed with a protruding portion toward the slot which is a space between adjacent teeth, and the protruding portion increases the protruding amount toward the slot side from the inner diameter side toward the outer diameter side. The bobbin portion has a thickness corresponding to the protrusion amount, and has a protrusion amount that comes into contact with the winding when the winding is wound, and is pressed toward the non-slot side by the tightening force of the winding. Accordingly, the armature of the rotating electrical machine prevents the extension portion of the core insulator from being separated from the protrusion . 2. The armature for a rotating electrical machine according to claim 1, wherein the core insulator includes a cover portion that covers one side surface of both radial side surfaces of the core, and the bobbin portion extends in an axial direction from the cover portion. And the extension part is formed to extend, and the cover part, the bobbin part, and the extension part constitute a teeth containing part including a protrusion,
In the rotating electrical machine, an insertion port for a tooth including a protrusion is formed at an end of the bobbin portion and the extension portion opposite to the cover portion, and the protrusion is formed in the bobbin portion corresponding to the insertion port . Armature. The armature for a rotating electrical machine according to claim 2 , wherein an inner surface of the bobbin portion corresponding to the insertion port is chamfered toward the slot side .

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