JP2011142770A - Armature and brushless motor - Google Patents

Abstract

An armature capable of suppressing damage to a lead wire drawn out from a first layer of a coil is provided.
A coil 23 having a plurality of layers wound around a tooth covering portion 32 of an insulator 22 is provided, and a lead wire 23s drawn from a first layer of the coil 23 is connected to a power supply side terminal (connection terminal 52). Is done. Further, the insulator 22 protrudes in the circumferential direction from the first side portion 32 c of the teeth covering portion 32, and protrudes to guide the root portion 23 b of the lead wire 23 s to the upper layer side of the first layer coil wire 41 of the coil 23. A guide part 35 is formed. The coil 23 is wound around the teeth covering portion 32 from the protruding guide portion 35 so that the second layer coil wire 42 of the coil 23 is not in contact with the root portion 23b of the lead wire 23s.
[Selection] Figure 3

Description

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

  Conventionally, a stator as an armature of a brushless motor is wound around a tooth portion extending in the radial direction, an insulator having a tooth covering portion covering both axial end surfaces and circumferential end surfaces of the tooth portion, and a tooth covering portion of the insulator. And a coil composed of a plurality of rotated layers (see, for example, Patent Document 1). In the coil, a lead wire is drawn out from the first layer in contact with the teeth covering portion, and the lead wire is connected to a power supply side terminal for power supply.

JP 2005-269875 A

  By the way, in the armature as described above, since the lead wire 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. .

  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 damage to a lead wire drawn from the first layer of the coil. There is.

  In order to solve the above-described problem, the invention according to claim 1 includes a tooth portion extending in a radial direction, an insulator having a tooth covering portion covering both axial end surfaces and circumferential end surfaces of the teeth portion, and A coil composed of a plurality of layers wound around the teeth coating portion of the insulator, and an armature in which a lead wire led out from the first layer in contact with the teeth coating portion in the coil is connected to a power supply side terminal The insulator has a protruding guide portion that protrudes in the circumferential direction from one side surface in the circumferential direction of the teeth covering portion and guides the root portion of the lead wire to the upper layer side of the first layer of the coil. The coil is wound around the teeth covering portion from the protruding guide portion, and the coil wire from the second layer onward of the coil contacts the root portion of the lead wire And wherein the wound so as not.

  In the present invention, the base portion of the lead wire is guided to the upper layer side of the first layer of the coil by the protruding guide portion, and is configured not to contact the coil wires of the second layer and thereafter. As a result, since the root portion of the lead wire is configured not to contact the coil wires of the first layer and the second and subsequent layers, the contact between the coil wire and the lead wire caused by the vibration on the coil side is suppressed. . For this reason, forces such as tension, compression, and bending that the lead wire receives due to contact with the coil wire can be suppressed, and as a result, damage to the lead wire can be suppressed.

  According to a second aspect of the present invention, in the armature according to the first aspect, the protruding guide portion includes a portion of the tooth covering portion that is in contact with the coil wire at the start of winding at one side portion in the circumferential direction of the teeth covering portion. It is characterized by having a shape that is thicker than the other parts of the part.

  In the present invention, the portion of the teeth covering portion that comes into contact with the coil wire at the start of winding is made thick so that the root portion of the lead wire does not come into contact with the first and second and subsequent coil wires. It becomes possible to do.

  According to a third aspect of the present invention, in the armature according to the second aspect, a radius of curvature of a corner portion from the protruding guide portion to an end surface on the side opposite to the lead-out portion in the tooth direction of the teeth covering portion is the protruding guide. It is characterized by being set larger than the radius of curvature of the corner from the circumferential side portion of the teeth covering portion other than the portion to the axial end surface of the teeth covering portion.

  In the present invention, the first curve portion when the coil wire starts to be wound around the tooth covering portion is more susceptible to vibration on the coil side than the other curve portion of the coil wire because the lead wire of the coil is connected to the power supply side terminal. However, since the curvature radius of the first curve part of the coil wire is larger than the curvature radius of the other curve part of the coil wire, the stress applied to the first curve part of the coil wire It becomes possible to suppress.

  According to a fourth aspect of the present invention, in the armature according to any one of the first to third aspects of the present invention, a holding recess for holding the coil wire is formed in the protruding guide portion. And

In this invention, since the coil wire at the beginning of winding is held by the holding recess of the protruding guide portion, it is possible to suppress the coil wire from dropping from the protruding guide portion.
According to a fifth aspect of the present invention, in the armature of the fourth aspect, the insulator is opposed to the holding recess in the circumferential direction and is engaged with the coil wire held in the holding recess in the circumferential direction. A first engagement portion and a second engagement portion that engages with the coil wire held in the holding recess in the radial direction are formed.

In the present invention, it is possible to further prevent the coil wire from dropping from the protruding guide portion by the first and second engaging portions.
A sixth aspect of the present invention is a brushless motor comprising the armature according to any one of the first to fifth aspects.

  According to the present invention, it is possible to provide a brushless motor in which damage to the lead wire drawn from the first layer of the armature coil is suppressed.

  Therefore, according to the above-described invention, it is possible to suppress damage to the lead wire drawn from the first layer of the coil.

It is sectional drawing of the brushless motor of this embodiment. It is a top view which shows the stator of this embodiment. (A) is a top view for demonstrating a protrusion guide part, (b) is AA sectional drawing in the figure (a).

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
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 press-fitted and fixed to the inner peripheral surface of the housing 2. It is sandwiched between the bottom 2a and the end frame 5. 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 rotary 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. Note that an oil seal 16 is provided on the outer side of the bearing 13 in the bearing housing portion 2 b to seal a gap between the bearing housing portion 2 b and the rotary shaft 12.

  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 (a) and 3 (b), the stator 3 includes a stator core 21 having a plurality of (in this embodiment, 12) teeth portions 20, an insulator 22 mounted on the stator core 21, A coil 23 wound around the tooth portion 20 via an insulator 22 is provided.

  The stator core 21 has an annular base portion 24 (see FIG. 3A) corresponding to the outer peripheral cylindrical portion 3 a of the stator 3. Each tooth portion 20 extends radially inward from the circumferentially equidistant positions of the base portion 24, and the circumferential width of the distal end portion (inner end portion) of each tooth portion 20 increases. It has a shape. The stator core 21 is configured by laminating a plurality of plate-shaped core sheets in the axial direction. Moreover, the teeth part 20 has comprised the cross-sectional rectangle shape (refer FIG.3 (b)).

  As shown in FIGS. 3A and 3B, the insulator 22 covers a base covering portion 31 that covers the base portion 24 of the stator core 21, and extends radially from the base covering portion 31 to cover the teeth portion 20. And a teeth covering portion 32. As shown in FIG. 1, the base covering portion 31 extends on both sides in the axial direction.

  As shown in FIG. 3B, the teeth covering portion 32 includes an upper portion 32 a and a lower portion 32 b that respectively cover both end surfaces in the axial direction of the teeth portion 20, and a first side that respectively covers both end surfaces in the circumferential direction of the teeth portion 20. It has a portion 32c and a second side portion 32d. Moreover, the teeth coating | coated part 32 does not coat | cover the front end surface of the teeth part 20, and the front end surface of the teeth part 20 is exposed from the teeth coating | coated part 32, and opposes the rotor 4 to radial direction. (See FIG. 1). The insulator 22 is divided at the central portion in the axial direction as shown in FIG.

  A coil 23 is wound around each tooth portion 20 from above the tooth covering portion 32 of the insulator 22. The coil 23 is wound in such a manner that its coil axis faces the radial direction, and is composed of a plurality of layers (two layers in this embodiment).

  A plurality of guide grooves 33 extending along the axial direction and arranged in the radial direction are formed in the first and second side portions 32c and 32d of the teeth covering portion 32 of the insulator 22, respectively. The 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.

  Here, 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 the four coils 23 wound around the teeth portion 20 at equal intervals in the circumferential direction have the same phase. It has become. And the four coils 23 of each phase are comprised by one conducting wire (coil wire) with a circular cross section. 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. An end 23e of the coil wire is pulled out from the tooth portion 20e at the end of winding, and the end 23e is electrically connected to a neutral point terminal 34 provided on the base covering portion 31 of the insulator 22. It has become.

  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.

  Here, the structure about the teeth part 20a-20c of the winding start of the coil 23 of each phase is demonstrated according to Fig.3 (a) (b). The protrusion guide part 35 is formed in the 1st side part 32c of the teeth coating | coated part 32 which coat | covers the teeth parts 20a-20c. The protruding guide part 35 is formed at the radially outer end. The protruding guide portion 35 has a shape in which the portion of the first side portion 32c that comes into contact with the coil wire 23a at the beginning of winding is made thicker than the other portions of the teeth covering portion 32 (see FIG. 3B). . That is, the protrusion guide part 35 is comprised so that it may protrude in the circumferential direction from the side surface by the side of the 1st side part 32c of the teeth coating | coated part 32 (refer Fig.3 (a)).

  And when winding the coil 23 around the teeth coating | coated part 32 of the teeth parts 20a-20c, it starts to wind a coil wire from the protrusion guide part 35, and winds the 1st layer coil wire 41 in order to radial inside from there. It is supposed to turn. That is, the coil wire 23 a at the start of winding is positioned on the upper layer side (in the present embodiment, at the same position as the second layer coil wire 42) than the first layer coil wire 41 by the protruding guide portion 35. As a result, the root portion 23b of the lead wire 23s of the coil 23 drawn out to the upper portion 32a side of the teeth covering portion 32 (the portion where the coil wire 23a at the beginning of winding first contacts the insulator 22 (projection guide portion 35) and the vicinity thereof. ) Is also guided to the upper layer side than the first layer coil wire 41. The second layer coil wire 42 wound on the first layer coil wire 41 includes a root portion 23b of the lead wire 23s and a coil wire 23a at the start of winding (at least a half circumference on the winding start side of the coil wire 23a at the start of winding). It is comprised so that it may not contact with the coil wire 23a of the part which contact | connects the side part 32c and the lower part 32b of the teeth coating | coated part 32 corresponded to a part. As a result, contact between the first layer and second layer coil wires 41 and 42 and the lead wire 23 s caused by vibration on the coil 23 side is suppressed, so that contact between the first layer and second layer coil wires 41 and 42 is achieved. Thus, the force such as tension, compression, bending and the like received by the lead wire 23s can be suppressed, and as a result, damage to the lead wire 23s can be suppressed.

  The radius of curvature of the corner 32e from the protruding guide part 35 to the lower part 32b of the teeth covering part 32 is from the first and second side parts 32c, 32d other than the protruding guide part 35 of the teeth covering part 32 to the upper part 32a and the lower part 32b. Is set larger than the corner portion 32f. In addition, an arc-shaped holding concave portion 35a for holding the coil wire 23a at the start of winding is formed at the protruding tip of the protruding guide portion 35, so that the coil wire 23a at the start of winding from the protruding guide portion 35 is dropped. It is supposed to be suppressed. Further, the insulator 22 is formed with an engaging portion 36 (first engaging portion) that opposes the holding recess 35a in the circumferential direction and engages with the coil wire 23a at the start of winding held in the holding recess 35a in the circumferential direction. Has been. The coil wire 23a at the start of winding held in the holding recess 35a is engaged with the base covering portion 31 (second engaging portion) of the insulator 22 in the radial direction.

  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, and the end frame 5 covers the control circuit member 50. A motor cover 53 is mounted on the. In the motor cover 53, the connector part 51 of the control circuit member 50 is fixed to the end frame 5, and the connector part 51 is provided with a plurality of connection terminals 52 (only one is shown in FIG. 1) as power supply side terminals. It has been. The connector 51 can be connected to an external power connector (not shown). Each connection terminal 52 is led out from the connector portion 51 into the motor cover 53 and is electrically connected to each phase lead wire 23s from the stator 3 side.

  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, characteristic effects of the present embodiment will be described.
(1) The insulator 22 protrudes in the circumferential direction from the first side portion 32 c of the teeth covering portion 32, and guides the root portion 23 b of the lead wire 23 s to the upper layer side of the first layer coil wire 41 of the coil 23. A protruding guide part 35 is formed. The coil 23 is wound around the teeth covering portion 32 from the protruding guide portion 35 so that the second layer coil wire 42 of the coil 23 is not in contact with the root portion 23b of the lead wire 23s. Accordingly, the root portion 23 b of the lead wire 23 s is configured to be guided to the upper layer side of the first layer of the coil 23 by the protruding guide portion 35 and not to contact the second layer coil wire 42. Thereby, the contact between the coil wire and the lead wire 23s caused by the vibration on the coil 23 side is suppressed. For this reason, the force such as tension, compression, and bending that the lead wire 23s receives by contact with the coil wires 41 and 42 can be suppressed, and as a result, damage to the lead wire 23s can be suppressed.

  (2) The protruding guide portion 35 has a shape in which the portion of the first side portion 32c (one side portion in the circumferential direction) that comes into contact with the coil wire 23a at the start of winding is thicker than the other portions of the teeth covering portion 32. . Thus, by making the portion of the tooth covering portion 32 that contacts the coil wire 23a at the beginning of winding thick, the root portion 23b of the lead wire 23s does not contact the first layer and second layer coil wires 41 and 42. It becomes possible to comprise.

  (3) The radius of curvature of the corner portion 32e from the protruding guide portion 35 to the end surface (lower portion 32b) on the side opposite to the drawing-out portion in the teeth covering portion 32 is the first and the other than the protruding guide portion 35 in the teeth covering portion 32. It is set larger than the corner portion 32f from the second side portions 32c and 32d to the upper portion 32a and the lower portion 32b. The first curve portion (corner portion 32e) when the coil 23 starts to be wound around the tooth covering portion 32 is connected to the connection terminal 52 of the lead wire 23s of the coil 23. 32f), it is easy to apply a large stress due to vibration on the coil 23 side. However, since the radius of curvature of the first curve portion of the coil wire is larger than the radius of curvature of the other curve portions, It is possible to suppress the stress applied to the curve portion.

  (4) The protrusion guide portion 35 is formed with a holding recess 35a for holding the coil wire 23a at the start of winding. Thereby, it is possible to suppress the coil wire 23a from falling off the protruding guide portion 35.

  (5) The insulator 22 has an engaging portion 36 (first engaging portion) that engages in the circumferential direction with the coil wire 23a that faces the holding recess 35a in the circumferential direction and is held in the holding recess 35a, and the coil. A base covering portion 31 (second engaging portion) that engages with the wire 23a in the radial direction is formed. For this reason, it is possible to further prevent the coil wire 23a from dropping from the protruding guide portion 35 by the engaging portion 36 and the base covering portion 31.

In addition, you may change embodiment of this invention as follows.
-In above-mentioned embodiment, although the insulator 22 was divided | segmented in the center part of the axial direction, it is not specifically limited to this, You may change suitably according to a structure.

-Although the number of the teeth parts 20 and the coils 23 was set to 12 in the said embodiment, it is not specifically limited to this, The number may be suitably set according to a structure.
-In above-mentioned embodiment, although the coil 23 was comprised by two layers, it is not specifically limited to this, It is good also as three or more layers. In the case of three or more layers, it is desirable to project the protruding guide portion 35 so that the position of the root portion 23b of the lead wire 23s is the same position as the uppermost layer of the coil or on the upper layer side of the uppermost layer. According to this configuration, the occupancy rate of the coil is reduced while the root portion 23b of the lead wire 23s is configured not to contact the first and second and subsequent coil wires at the protruding guide portion 35. It becomes possible to suppress.

  In the above embodiment, the protruding guide portion 35 has a shape in which the portion of the first side portion 32c that contacts the coil wire 23a at the start of winding is thicker than the other portions of the teeth covering portion 32. For example, it may be a shape that guides only the root portion 23b of the lead wire 23s, not the entire coil wire 23a at the start of winding.

  In the above-described embodiment, the radius of curvature of the corner portion 32e is set to be larger than that of the corner portion 32f in the tooth covering portion 32, but the present invention is not particularly limited thereto, and may be, for example, the same radius of curvature.

  In the above embodiment, the present invention is applied to the brushless motor 1, but may be applied to, for example, a DC motor.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 3 ... Stator (armature), 20, 20a, 20b, 20c, 20e ... Teeth part, 22 ... Insulator, 23 ... Coil, 23a ... Coil wire at the beginning of winding, 23b ... Base part, 23s ... Drawer Line 31, base covering portion (second engaging portion), 32 teeth covering portion 32 e, 32 f corner portion 35 projecting guide portion 35 a holding recess 36 engaging portion (first engaging portion) , 41... First layer coil wire, 42... Second layer coil wire, 52... Connection terminal as a power supply side terminal.

Claims (6)

Teeth portion extending in the radial direction;
An insulator having a teeth covering portion covering both axial end surfaces and circumferential end surfaces of the teeth portion;
A coil composed of a plurality of layers wound around the teeth covering portion of the insulator, and an armature in which a lead wire led out from the first layer in contact with the teeth covering portion of the coil is connected to a power supply side terminal Because
The insulator protrudes in the circumferential direction from one side surface in the circumferential direction of the teeth covering portion, and a protruding guide portion is formed for guiding the root portion of the lead wire to the upper layer side of the first layer of the coil.
The coil is wound around the teeth covering portion from the protruding guide portion, and is wound so that a coil wire from the second layer onward of the coil does not come into contact with a root portion of the lead wire. Armature. The armature according to claim 1,
The protruding guide portion has a shape in which a portion that comes into contact with a coil wire at the beginning of winding in a circumferential side portion of the teeth covering portion is thicker than other portions of the teeth covering portion. Armature. The armature according to claim 2, wherein
The radius of curvature of the corner portion from the protruding guide portion to the end surface on the side opposite to the drawing-out portion in the tooth covering portion of the tooth covering portion is the axis of the teeth covering portion from the circumferential side portion of the teeth covering portion other than the protruding guide portion An armature, wherein the armature is set to be larger than a curvature radius of a corner portion toward a direction end face. The armature according to any one of claims 1 to 3,
The armature according to claim 1, wherein a holding recess for holding the coil wire is formed in the protruding guide portion. The armature according to claim 4,
The insulator includes a first engagement portion that faces the holding recess in the circumferential direction and engages the coil wire held in the holding recess in the circumferential direction, and the coil wire and the diameter held in the holding recess. The armature characterized by forming the 2nd engaging part engaged in a direction.   A brushless motor comprising the armature according to claim 1.

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