JP2018191469A - Armature and brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature that is able to hinder falling of a drawing line from a guide part.SOLUTION: An insulator 22 is provided with a guide part 35 by which a drawing line 23s of a coil 23, which is the beginning of winding disposed in contact with teeth coating parts 32, is guided to a layer higher than a first layer (a first-layer coil line 41) of the coil 23. The guide part 35 has: a projection part 36 projecting radially inside (toward a teeth part 20a) from a base coating part 31; and a hold part 37 extending in a circumferential direction from the projection part 36, disposed radially opposite the base coating part 31, and holding the drawing line together with the base coating part 31. The circumferential length L from the root of the hold part 37, extending from the projection part 36, to the leading end of the hold part is set longer than the wire diameter D of the coil 23.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an armature and a brushless motor.

  Conventionally, for example, as shown in Patent Document 1, a stator as an armature of a brushless motor has a tooth portion extending in the radial direction, and a tooth covering portion that covers both end surfaces in the axial direction and both end surfaces in the circumferential direction of the tooth portion. An insulator and a coil composed of a plurality of layers wound around the teeth covering portion of the insulator are provided. In addition, a winding start lead wire (leading wire drawn out from the first layer of the coil) that comes into contact with the teeth covering portion of the coil is connected to a power supply side terminal for power supply. In the stator as described above, since the lead wire at the start of winding is drawn from the first layer of the coil, the root portion of the lead wire is in contact with the first and second layer coil wires. For this reason, there is a possibility that the lead wire may be damaged due to a large force such as tension, compression, bending, etc. from the first and second layer coil wires due to the vibration on the coil side. It was.

  Therefore, in the stator of Patent Document 1, a guide portion that protrudes in the circumferential direction from one side surface in the circumferential direction of the teeth covering portion of the insulator is formed, and by this guide portion, the root portion of the lead wire is formed from the first layer of the coil. Also guides to the upper side. Thereby, the force which a lead wire receives from a coil at the time of the vibration of a coil side can be suppressed, and as a result, damage to a lead wire is suppressed.

JP 2011-142770 A

  However, in the stator of Patent Document 1, the portion that holds the lead wire in the guide portion is simply an arc-shaped recess (a holding recess in Patent Document 1), and the lead wire is dropped from the holding recess. There was a fear. In addition, when the lead wire diameter (coil wire diameter) is set to be thin, the holding recess dimension of the guide portion is set to be small in accordance with the wire diameter. It becomes difficult to form the shape of the recess with high accuracy, and the problem of dropout of the lead wire becomes particularly significant.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an armature and a brushless motor that can suppress the dropout of the lead wire from the guide portion.

  An armature that solves the above problems includes a cylindrical base portion, an armature core having a tooth portion extending in a radial direction from a peripheral surface of the base portion, and a base covering portion that covers the peripheral surface of the base portion, And an insulator having a teeth covering portion covering both axial end faces and circumferential end faces of the teeth portion, and a coil composed of a plurality of layers wound around the teeth covering portion of the insulator, the insulator includes: An armature provided with a guide portion that guides a lead wire at the start of winding in contact with the teeth coating portion of the coil to an upper layer side than the first layer of the coil, wherein the guide portion is the base coating A projection projecting from the projection to the teeth portion side in the radial direction, and extending in the circumferential direction from the projection to be opposed to the base coating portion in the radial direction by the base coating portion. And a holding portion for holding the by line, the circumferential length from the root portion of the holding portion extending from the projecting portion to the tip portion is longer than the wire diameter of the coil.

  According to this configuration, the circumferential length of the holding portion that holds the lead wire with the base covering portion is set to be longer than the coil wire diameter (lead wire diameter), so that the lead wire can be stably held. , Dropout of the lead wire from the guide portion can be suppressed.

  In the armature, a tapered surface that is inclined so as to be separated from the base covering portion is provided on a side surface facing the base covering portion in a radial direction at a tip portion of the holding portion toward a tip end side of the holding portion. Yes.

  According to this configuration, the tapered surface provided at the distal end portion of the holding portion forms a shape in which the entrance between the holding portion and the base covering portion expands. Therefore, the lead line is provided between the holding portion and the base covering portion. Easy to place.

  In the above armature, the insulator includes a restricting portion that protrudes in the radial direction from the base covering portion and restricts the movement of the coil wire in the radial direction above the first layer of the coil in the radial direction.

  According to this configuration, the movement of the coil wire in the upper layer from the first layer of the coil in the radial direction is restricted by the restricting portion of the insulator. Thereby, it can suppress that the coil wire of an upper layer rather than the 1st layer of a coil moves to radial direction, falls to the lower layer side, and the alignment state of a coil is disturbed.

In the armature, the guide portion also serves as the restricting portion.
According to this configuration, it is possible to regulate the movement of the coil wire in the radial direction above the first layer of the coil in the radial direction by the guide unit that also serves as the regulating unit.

  In the armature, the guide portion is provided only on one side in the circumferential direction of the teeth coating portion, and the insulator has the other side regulation portion as the regulation portion on the other circumferential side of the teeth coating portion. It is provided separately from the guide.

  According to this configuration, the movement of the coil wire in the radial direction above the first layer of the coil in the radial direction is restricted by the guide portion as the restricting portion on one side in the circumferential direction of the tooth covering portion. The other side of the direction is regulated by the other side regulation part. For this reason, the movement to the radial direction of the coil wire of the upper layer rather than the 1st layer of a coil can be controlled more reliably.

A brushless motor that solves the above problems includes the armature described above.
According to this configuration, the dropout of the lead wire from the guide portion is suppressed in the armature, and as a result, it can contribute to the improvement of the reliability of the motor.

  According to the armature and the brushless motor of the present invention, it is possible to suppress the dropout of the lead wire from the guide portion.

It is sectional drawing of the brushless motor of embodiment. It is a top view which shows the stator of the same form. The top view which expands and shows the stator of the same form partially.

Hereinafter, an embodiment of the armature and the brushless motor will be described.
A brushless motor 1 according to the present embodiment shown in FIG. 1 is used, for example, in a valve timing variable device of a vehicle engine. A housing 2 of the brushless motor 1 is formed in a substantially bottomed cylindrical shape, and an annular stator 3 (armature) and a rotor 4 arranged inside the stator 3 are provided in the housing 2. Yes. An end frame 5 is provided so as to close the opening of the housing 2.

  The stator 3 is fixed to the inner peripheral surface of the housing 2 by press fitting or the like. The rotor 4 rotatably supported inside the stator 3 includes a rotor core 10 formed by stacking a plurality of disk-shaped core sheets, and a magnet 11 is fixed to the outer peripheral surface of the rotor core 10. A through hole 10a is provided in the central portion of the rotor core 10, and the rotary shaft 12 is fitted into the through hole 10a. Thereby, the rotor core 10 and the rotating shaft 12 are fixed so that integral rotation is possible. Although the rotor core 10 is directly fixed to the rotating shaft 12, the rotor core 10 may be fixed with an engaging member interposed between the rotor core 10 and the rotating shaft 12.

  The rotary shaft 12 is rotatably supported by bearings 13 and 14 provided on the housing 2 and the end frame 5 respectively. Specifically, a bearing housing portion 5a is provided at the center portion of the end frame 5, and an outer ring of the bearing 14 is fixed to an inner peripheral surface of the bearing housing portion 5a via an elastic member (not shown). The inner ring is fixed to the rotary shaft 12. The base end portion of the rotating shaft 12 is configured not to directly contact the end frame 5. In addition, by transmitting an elastic member between the outer ring of the bearing 14 and the bearing housing portion 5 a of the end frame 5, vibration transmission from the rotor 4 to the end frame 5 is suppressed.

  A bearing housing 2b is also provided at the center of the bottom 2a of the housing 2, and the outer ring of the bearing 13 is fixed to the inner peripheral surface of the bearing housing 2b, and the inner ring of the bearing 13 is fixed to the rotating shaft 12. Has been. An axially intermediate portion of the rotary shaft 12 is rotatably supported by the bearing 13. An oil seal 16 that seals the gap between the bearing housing portion 2b and the rotary shaft 12 is provided outside the bearing 13 in the bearing housing portion 2b.

  On the end frame 5 side of the rotor 4 with respect to the rotor core 10, a ring-shaped sensor magnet 17 is provided so as to be rotatable integrally with the rotor 4. The sensor magnet 17 is provided to detect the rotational position of the rotor 4. The sensor magnet 17 is alternately provided with N poles and S poles at predetermined angles.

  As shown in FIGS. 2 and 3, the stator 3 includes a stator core 21 having a plurality of (in this embodiment, 12) tooth portions 20, an insulator 22 attached to the stator core 21, and an insulator 22 in each tooth portion 20. And a coil 23 wound through the wire. The insulator 22 is molded from a synthetic resin material by injection molding or the like.

  The stator core 21 has a cylindrical base portion 24 (see FIG. 3) that constitutes the outer peripheral frame of the stator 3. Each tooth portion 20 extends radially inward from the inner peripheral surface of the base portion 24. Moreover, each teeth part 20 is provided at equal intervals in the circumferential direction. The tip end portion (inner peripheral side end portion) of each tooth portion 20 has a shape in which the circumferential width increases. The stator core 21 is configured by laminating a plurality of plate-shaped core sheets in the axial direction. Further, the tooth portion 20 has a rectangular cross-sectional shape orthogonal to the radial direction.

  As shown in FIG. 3, the insulator 22 includes a base covering portion 31 that covers the inner peripheral surface of the base portion 24 and a plurality of tooth covering portions 32 that respectively cover the teeth portions 20. The insulator 22 has an axial covering portion 22 a that covers the axial end surface of the base portion 24.

  Each teeth covering portion 32 covers both end surfaces in the axial direction and both end surfaces in the circumferential direction of each tooth portion 20. Each tooth covering portion 32 extends radially inward from the base covering portion 31. In addition, the front end surface (radially inner end surface) of the teeth portion 20 is exposed from the teeth covering portion 32 and faces the rotor 4 in the radial direction (see also FIG. 1). The insulator 22 has a configuration that is divided in the axial direction at a portion corresponding to the central portion of the stator core 21 in the axial direction.

  A coil 23 is wound around each tooth portion 20 from above the tooth covering portion 32. The coil 23 is wound in such a way that its coil axis faces the radial direction of the stator core 21 and is composed of a plurality of layers (in this embodiment, two layers).

  Guide grooves 33 extending along the axial direction are formed on both sides in the circumferential direction of the teeth covering portion 32. A plurality of guide grooves 33 are formed side by side in the radial direction on each of the circumferential side surfaces of the teeth covering portion 32. Each guide groove 33 is for maintaining the alignment state of the first layer (first layer coil wire 41) of the coil 23. That is, the first layer coil wires 41 held in the guide grooves 33 are arranged side by side in the radial direction. Further, the second layer (second layer coil wire 42) of the coil 23 is wound around the first layer coil wire 41 and is formed between the wires adjacent in the radial direction in the first layer coil wire 41. It is guided by the hollow part to be kept in alignment.

  As shown in FIG. 2, the coils 23 are classified into three phases of a U phase, a V phase, and a W phase, and are wound around four teeth portions 20 that are located at equal intervals (90 ° intervals) in the circumferential direction. The rotated four coils 23 are in phase. And the four coils 23 of each phase are comprised by one conducting wire (coil wire) with a circular cross section.

  More specifically, the U-phase coil 23 is first wound from the tooth portion 20a, and then the coil wire at the end of winding in the tooth portion 20a is sequentially wound around every second tooth portion 20 in the counterclockwise direction. . Then, an end portion 23e of the coil wire is pulled out from the teeth portion 20e at the end of winding of the U phase, and the end portion 23e is electrically connected to a neutral point terminal 34 provided on the axial direction covering portion 22a of the insulator 22. Connected.

  The V-phase and W-phase coils 23 are similarly wound. The winding start of the V-phase coil 23 is the teeth portion 20b adjacent to the counterclockwise side of the teeth portion 20a of the winding start of the U-phase coil 23, and the winding start of the W-phase coil 23 is also the adjacent teeth thereof. It becomes part 20c. Three coils 23 at the beginning and end of winding of each phase are arranged in the circumferential direction. End ends 23e of the U-phase, V-phase, and W-phase coils 23 are electrically connected to a neutral point terminal 34, respectively. And from the coil 23 at the start of winding of each phase, an end portion (leading wire 23s) of the coil wire is drawn out. That is, the lead wire 23s is a wire drawn from the first layer (the first layer coil wire 41) of the coil 23 wound around the tooth portions 20a to 20c, and the root portion of the lead wire 23s is the tooth covering portion. It comes in contact with 32.

  The insulator 22 has three guide portions 35 that guide the lead wires 23s of the respective phases. Each guide portion 35 is provided in the vicinity of the base end (the side in the circumferential direction) of the tooth portions 20a to 20c at the beginning of winding of the coil 23 of each phase. Moreover, each guide part 35 has comprised the mutually same structure (same shape).

  FIG. 3 illustrates a tooth portion 20a at the beginning of winding of the U-phase coil 23. As shown in the figure, the guide portion 35 is provided on one side in the circumferential direction of the teeth covering portion 32 that covers the teeth portion 20a. The guide part 35 includes a protrusion part 36 that protrudes radially inward (downward in FIG. 3) from the base covering part 31 and a holding part 37 that extends from the protrusion part 36 to the opposite side of the tooth part 20a in the circumferential direction. Yes. In addition, the guide part 35 (the protrusion part 36 and the holding | maintenance part 37) is located in the axial direction upper side from the upper surface 32a of the site | part which covers the axial direction end surface of the teeth part 20a in the teeth coating | coated part 32. FIG.

  The protrusion 36 extends from the position on the one side in the circumferential direction of the teeth covering portion 32 (the position on the right side of the teeth covering portion 32 in FIG. 3) to the other end in the circumferential direction of the upper surface 32a of the teeth covering portion 32 (FIG. 3). It extends in the circumferential direction up to the left end of the upper surface 32a. That is, a part of the projecting portion 36 is adjacent to the upper surface 32a of the teeth covering portion 32 in the axial direction, and the first layer coil is formed on the radially inner side (lower side in FIG. 3) of the adjacent portion 36a. An inclined surface 36b for guiding the outermost line of the line 41 (the line on the base end side of the tooth portion 20a) is formed.

  The holding part 37 is opposed to the base covering part 31 with a gap in the radial direction. And the holding recessed part 35a hollowed in the teeth part 20a side of the circumferential direction is comprised by the mutual opposing surface of the holding | maintenance part 37 and the base coating | coated part 31, and the circumferential direction one end part of the protrusion part 36. In this holding recess 35a, the lead wire 23s of the coil 23 is accommodated and held. And the guide part 35 is guiding the lead wire 23s to the upper layer side rather than the 1st layer coil wire 41 by hold | maintaining the lead wire 23s in the holding | maintenance recessed part 35a.

  The cross-sectional shape perpendicular to the axis of the bottom surface of the holding recess 35a is a semicircular shape having substantially the same diameter as the wire diameter D of the coil 23 (the wire diameter of the lead wire 23s). A circumferential length L from the root portion (the innermost portion of the holding recess 35 a) of the holding portion 37 extending from the protruding portion 36 to the tip portion is set to be longer than the wire diameter D of the coil 23. In addition, a tapered surface 37 a that is inclined so as to be separated from the base covering portion 31 toward the circumferential front end side of the holding portion 37 is provided on a side surface facing the base covering portion 31 in the distal end portion of the holding portion 37 in the radial direction. Yes. Thereby, the opening end of the circumferential direction of the holding | maintenance recessed part 35a makes the shape which expands to radial direction.

  The guide part 35 has a regulating surface 35b on the radially inner side surface. The restricting surface 35b is located on the side in the circumferential direction of the tooth portion 20a (the teeth covering portion 32), and has an inclined portion that is inclined inward in the radial direction as the distance from the tooth portion 20a in the circumferential direction. This restricting surface 35b moves to the radially outer side (the base end side of the teeth portion 20a) of the coil wire above the first layer coil wire 41 on one side in the circumferential direction of the teeth portion 20a (right side in FIG. 3). Is to regulate.

  Further, the insulator 22 moves on the other side in the circumferential direction of the tooth portion 20a (left side in FIG. 3) to the outside in the radial direction of the coil wire above the first layer coil wire 41 (the base end side of the tooth portion 20a). It has the control part 38 (other side control part) which regulates. The restricting portion 38 has an inclined surface 38a that is inclined radially inward as it is separated from the tooth portion 20a in the circumferential direction. The inclined surface 38a has an inclination angle along a sequence of coil wires on the most proximal side of the teeth in each layer when the coil 23 is configured in a layered manner in the above-described alignment mode.

  By restricting the regulation surface 35b of the guide part 35 and the inclined surface 38a of the regulation part 38, it is possible to suppress the coil layer on the upper layer from falling on the lower layer side than the first layer coil wire 41 and disturbing the alignment state of the coil 23. It has become. The functions of the regulation surface 35b of the guide part 35 and the inclined surface 38a of the regulation part 38 are particularly effectively exhibited when the coil 23 is composed of three or more layers. In FIG. 3, as an example, the third layer coil wire 43 is illustrated by a two-dot chain line.

  As shown in FIG. 1, a control circuit member 50 for driving the brushless motor 1 is provided on the surface of the end frame 5 opposite to the surface facing the stator 3 and the rotor 4. Further, a motor cover 53 that covers the control circuit member 50 is attached to the end frame 5.

  The control circuit member 50 includes a connector portion 51 fixed to the end frame 5. The connector portion 51 is provided with a plurality of connection terminals 52 (only one is shown in FIG. 1) as power supply side terminals. The connector 51 can be connected to an external power connector (not shown). One end of each connection terminal 52 is connected to the external power connector, and the other end of each connection terminal 52 is connected to the lead wire 23s of each phase extending from the stator 3 side in the motor cover 53. Electrically connected.

Next, the operation of this embodiment will be described.
In the brushless motor 1 described above, when a driving current corresponding to each phase is supplied from the control circuit member 50 to the coil 23 of each phase via the connection terminal 52 and the lead wire 23s, a rotating magnetic field is generated in the stator 3, The rotor 4 is rotated by the rotating magnetic field.

Next, the effect of this embodiment will be described.
(1) The insulator 22 has a guide portion that guides the winding start lead wire 23 s in contact with the teeth covering portion 32 of the coil 23 to the upper layer side of the first layer (first layer coil wire 41) of the coil 23. 35 is provided. The guide portion 35 protrudes radially inward (to the teeth portion 20a) from the base covering portion 31, and extends in the circumferential direction from the protruding portion 36 so as to face the base covering portion 31 in the radial direction. The part 31 has a holding part 37 for holding the lead wire 23s. The circumferential length L from the base portion to the tip portion of the holding portion 37 extending from the protruding portion 36 is set to be longer than the wire diameter D of the coil 23 (the diameter of the lead wire 23s). Thereby, the lead wire 23s can be stably held, and the drop of the lead wire 23s from the guide portion 35 can be suppressed. Moreover, since the above-described dimension setting does not require the accuracy of the shape of the guide portion 35, the maintenance cost of the mold can be suppressed, for example, and the manufacturing cost can be reduced.

  (2) A tapered surface 37 a that is inclined so as to be separated from the base covering portion 31 toward the leading end side of the holding portion 37 is provided on a side surface of the holding portion 37 that faces the base covering portion 31 in the radial direction. . According to this configuration, the tapered surface 37a provided at the distal end portion of the holding portion 37 has a shape in which the inlet (the opening end in the circumferential direction of the holding recess 35a) between the holding portion 37 and the base covering portion 31 expands. Therefore, it is easy to arrange the lead wire 23s between the holding portion 37 and the base covering portion 31 (that is, the holding recess 35a).

  (3) The insulator 22 protrudes radially inward from the base covering portion 31 and restricts movement of the upper coil wire above the first layer coil wire 41 in the radial direction (guide portion 35 and restricting portion 38). ). Thereby, it can suppress that the coil wire of an upper layer rather than the 1st layer coil wire 41 moves to a radial direction, falls to the lower layer side, and the alignment state of a coil is disturbed.

(4) The movement of the coil wire on the upper layer than the first layer coil wire 41 to the outside in the radial direction can be restricted by the guide portion 35 that also serves as a restricting portion.
(5) The guide portion 35 is provided only on one side in the circumferential direction of the teeth covering portion 32 (tooth portion 20a), and the insulator 22 is disposed on the other circumferential side of the teeth covering portion 32 in the restricting portion 38 (the other side restricting portion). ) Separately from the guide unit 35. According to this configuration, the movement of the coil wire on the upper layer than the first layer coil wire 41 in the radially outer side is caused by the guide portion 35 serving as a restricting portion on one side in the circumferential direction of the tooth covering portion 32 (tooth portion 20a). It is regulated, and is regulated by the regulating portion 38 on the other circumferential side. For this reason, the movement to the outer side of the radial direction of the coil wire of the upper layer than the 1st layer coil wire 41 can be controlled more reliably.

In addition, you may change the said embodiment as follows.
-The number of layers of the coil 23 in the said embodiment is an illustration, and can be changed suitably.
-The number of the teeth parts 20 and the coils 23 in the said embodiment is an illustration, and can be changed suitably.

  In the above embodiment, the radial interval between the base covering portion 31 and the holding portion 37 (the radial dimension of the holding recess 35a) is slightly smaller than the wire diameter D of the coil 23 (the diameter of the lead wire 23s). You may set small. Thereby, the structure which clamps the lead wire 23s by radial direction with the base coating | coated part 31 and the holding | maintenance part 37 (that is, the force of the direction pinched | interposed to radial direction from the base coating | coated part 31 and the holding | maintenance part 37 with respect to the lead wire 23s generate | occur | produces. Thus, the lead wire 23s can be held more stably.

  -The shape of the guide part 35 in the said embodiment is an illustration, and can be changed suitably. For example, in the above-described embodiment, the holding portion 37 of the guide portion 35 extends from the protruding portion 36 to the side opposite to the circumferential tooth portion 20a, but the holding portion 37 extends to the circumferential tooth portion 20a side. You may comprise. In addition, the shape of the holding recess 35a in the above embodiment is merely an example, and may be formed, for example, in a U-shaped cross section other than a semicircular cross section.

In the above embodiment, the protruding portion 36 of the guide portion 35 is adjacent to the teeth covering portion 32, but the present invention is not limited to this, and the protruding portion 36 may be separated from the teeth covering portion 32.
In the above embodiment, although not mentioned in particular, the holding position of the lead wire 23 s in the holding recess 35 a of the guide portion 35 is set on the upper layer side than the third layer coil wire 43. However, the holding position of the lead wire 23 s is not limited to the above embodiment, and can be changed as appropriate according to the winding mode of the coil 23.

  In the above embodiment, the guide part 35 restricts the radial movement of the coil wire above the first layer coil wire 41. However, the guide part 35 is not limited to this, and the guide part 35 is connected to the lead wire 23s of the coil 23. You may provide in the position which does not interfere with the part except for.

  -In above-mentioned embodiment, although the guide part 35 and the control part 38 are provided in the circumferential direction side of the teeth part 20a-20c of the winding start of each phase among several teeth part 20a, it is not restricted to this. Further, it may be provided on the side in the circumferential direction of all the teeth portions 20 including the teeth portions 20a to 20c. Further, in the above embodiment, the restricting portion 38 may be omitted.

  -Although the connection aspect of the coil 23 in the said embodiment is made into the star connection which has a neutral point (neutral point terminal 34), this is an illustration and changes to the delta connection which does not have a neutral point. It is also possible.

  In the above embodiment, the winding mode has a configuration of only one system (a configuration in which one winding line 23s is provided for each phase and one neutral point is provided). It is good also as a structure provided. In addition, when comprised by two systems, it becomes the structure provided with two lead wires 23s of the winding start in each phase, and two neutral points.

-In above-mentioned embodiment, although this invention was applied to the brushless motor 1, you may apply to a motor with a brush other than this, for example.
In the above embodiment, the present invention is applied to the inner rotor type motor in which the rotor 4 is disposed on the inner peripheral side of the stator 3, but may be applied to an outer rotor type motor in which the rotor is disposed on the outer peripheral side of the stator. In this case, the configuration of the teeth, insulators, and the like in the stator is the configuration opposite to the above embodiment in the radial internal and external relationships.

  -You may combine embodiment mentioned above and each modification suitably.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 3 ... Stator (armature), 20 ... Teeth part, 21 ... Stator core (armature core), 22 ... Insulator, 23 ... Coil, 23s ... Lead wire, 24 ... Base part, 31 ... Base coating part 32 ... Teeth covering part, 35 ... Guide part, 36 ... Projection part, 37 ... Holding part, 37a ... Tapered surface, 38 ... Restriction part (other side restriction part), 41 ... First layer coil wire, 42 ... Second Layer coil wire.

Claims (6)

An armature core having a cylindrical base portion and a tooth portion extending in a radial direction from a peripheral surface of the base portion;
An insulator having a base covering portion covering the peripheral surface of the base portion, and a tooth covering portion covering both axial end surfaces and circumferential end surfaces of the teeth portion;
A coil comprising a plurality of layers wound around the teeth covering portion of the insulator;
The insulator is an armature provided with a guide portion that guides a lead wire at the beginning of winding in contact with the teeth coating portion of the coil to the upper layer side than the first layer of the coil,
The guide portion protrudes from the base covering portion toward the teeth portion in the radial direction, and extends in the circumferential direction from the protruding portion and faces the base covering portion in the radial direction. A holding portion for holding the lead wire,
The armature, wherein a length in a circumferential direction from a base portion to a tip portion of the holding portion extending from the protruding portion is set longer than a wire diameter of the coil. The armature according to claim 1,
A taper surface that is inclined so as to be separated from the base covering portion toward a tip end side of the holding portion is provided on a side surface of the holding portion at a distal end portion that faces the base covering portion in a radial direction. Armature to do. The armature according to claim 1 or 2,
The insulator includes a restricting portion that protrudes in a radial direction from the base covering portion and restricts movement of a coil wire in a layer higher than the first layer of the coil in the radial direction. The armature according to claim 3,
The armature characterized in that the guide portion also serves as the restricting portion. The armature according to claim 4,
The guide part is provided only on one side in the circumferential direction of the teeth covering part,
The insulator is provided with an other-side restricting portion as the restricting portion separately from the guide portion on the other circumferential side of the teeth covering portion.   A brushless motor comprising the armature according to claim 1.