JP5692271B2 - Rotor and rotating electric machine equipped with the same - Google Patents

Description

  The present invention relates to a rotor having a commutator and a rotating electrical machine including the rotor.

As a conventional rotating electrical machine having a commutator, a terminal portion (hook) bent in a U shape is formed on a commutator piece, and a connecting portion to which a lead wire (coil) from an armature winding is connected is chamfered Thus, even if the terminal portion is inclined, the lead wire can be welded and connected to the terminal portion without disconnection (see, for example, Utility Model Document 1).
The small motor described in Utility Model Document 1 has an armature in which a lead wire from an armature winding wound around a slot having an iron core is wound along a chamfered shape of a connecting portion and wound around another slot. Since it is connected to the winding, the gap between the lead wires adjacent to each other in the circumferential direction is widened and the insulation reliability is improved as compared with the case where chamfering is not performed.

Japanese Utility Model Publication No. 4-64974 (FIG. 1)

  When the wire diameter of the coil is relatively small, the small motor described in the utility model document 1 winds the coil from the armature winding along the chamfered shape of the hook. The distance between the wires increases, and the insulation reliability improves. However, in order to increase the output, for example, when a double winding method (a method in which thin wires with a thin wire diameter are wound in a double layer) is adopted, it is related to the hook. Since the coil to be stopped spreads in the circumferential direction, there is a problem that a distance between adjacent coils cannot be ensured and an insulation failure occurs.

  Further, when the hook formed on the commutator piece is bent in a U shape, bending stress is generated at the base of the hook, and the rigidity is lowered. In such a hook, if the hook is formed by chamfering and the coil is locked, if the hook is bent in a U shape, the rigidity of the hook base is further reduced, and the commutator There is also a possibility that the reliability of the mechanical strength of the piece may be lowered.

  The present invention has been made to solve the above-described problem, and includes a rotor with improved insulation reliability between adjacent coils while ensuring the reliability of the mechanical strength of the commutator piece. An object is to provide a rotating electrical machine.

The rotor according to the present invention has a plurality of slots, an iron core fixed to the shaft, a base resin fixed to the shaft, and a plurality of commutator pieces arranged in the circumferential direction on the outer peripheral surface of the base resin And a conductive wire including a coil wound around the slot and a short-circuit wire to which commutator pieces that should be at the same potential are connected to each other. The commutator piece is formed on the iron core side. A rotor in which the conductive wire is locked to the hook, the hook is bent and electrically connected to the conductive wire, and the coil is locked to the tip end side of the hook In addition, the short-circuit wire is locked to the base side of the hook, and a chamfer is formed at a corner of the coil locking portion where the coil of the hook is locked, so that the short-circuit of the hook the short wire engaging portion line is engaged, the surface It is characterized in that the corners are not Rigahodokosa is so formed.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the reliability of the mechanical strength of a commutator piece, the rotor which improved the insulation reliability between adjacent coils, and a rotary electric machine provided with the same can be provided.

It is sectional drawing of the motor 100 with a brush which is a rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing of the rotor 20 in FIG. It is sectional drawing of the iron core 22 in FIG. It is a connection diagram of the short circuit wire 23b latched by the commutator piece 25 (hook 26) in FIG. FIG. 3 is an enlarged cross-sectional view of the vicinity of a commutator piece 25 in FIG. 2, and is a view when a conducting wire 23 is locked to a hook 26. FIG. 3 is an enlarged cross-sectional view of the vicinity of a commutator piece 25 in FIG. 2 when a hook 26 and a conductive wire 23 are electrically connected. is there. It is explanatory drawing which showed the winding shape when the coil 23a and the short circuit wire 23b were latched by the hook 26. FIG. It is a figure when the conducting wire 23 (coil 23a, short circuit wire 23b) is latched by the hook 36 which is another modification of the hook 26 in FIG. FIG. 9 is an enlarged cross-sectional view of the vicinity of a commutator piece 45 that is another modification of the commutator piece 25 in FIG. 2, and is a view when a conducting wire 123 is locked to a hook 126. FIG. 9 is an enlarged cross-sectional view of the vicinity of a commutator piece 45 that is another modification of the commutator 25 in FIG. 2, and is a view when the hook 126 and the conductive wire 123 are electrically connected. It is explanatory drawing which showed the winding shape when the coil 123a1, the coil 123a2, and the short circuit wire 123b were latched by the hook 126. FIG.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 11. In each drawing, the same or equivalent members and parts will be described with the same reference numerals.
1 is a cross-sectional view of a brushed motor 100 that is a rotating electrical machine including the rotor 20 according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of the rotor 20 in FIG. 1, and FIG. 2 is a cross-sectional view in the axial direction of the iron core 22, and FIG. 4 is a connection diagram of the short-circuit wire 23b locked to the commutator piece 25 (hook 26) in FIG.
A motor 100 with a brush shown in FIG. 1 includes a bottomed cylindrical yoke 11, a permanent magnet 13 fixed by press-fitting or the like to the inner peripheral portion of the yoke circular pipe portion 11 a via a holder 12, and the permanent magnet 13. A rotor 20 is provided with an inner peripheral surface and a predetermined gap. The yoke 11, the holder 12, and the permanent magnet 13 constitute the stator 10.
The shaft 21 is rotatably supported by a bearing 14 held by a bearing case portion 11 b provided on the yoke 11 and a bearing 41 held by a bearing case portion 40 a provided on the housing 40.

As shown in FIG. 2, the rotor 20 includes an iron core 22 that is fixed to the shaft 21, a base resin 24 that is fixed to the outer peripheral surface of the shaft 21, and an outer peripheral surface of the base resin 24. And a commutator 30 composed of a plurality of commutator pieces 25 arranged.
As shown in FIG. 3, the iron core 22 has a plurality of (22 pieces in FIG. 3) slot cores 22 a extending radially around the shaft 21. A coil 23a (conductive wire 23) with an insulating coating such as a magnet wire is wound around the slot 22b between the slot cores 22a. Further, as shown in FIG. 1, the brush 43 is urged toward the commutator 30 by the spring brush 44 and is in sliding contact with the peripheral surface of the commutator piece 25.

A hook 26 is provided on the axial iron core 22 side (left side in FIG. 2) of the commutator piece 25, and a conductive wire 23 (coil 23 a and short-circuit wire 23 b) is locked to the hook 26. Here, the coil 23 a is locked to the hook 26 by being wound around the entire circumference of the hook 26. Further, the short-circuit line 23b connects the commutator pieces 25 that should be at the same potential, and FIG. 4 shows the commutator piece 25 (in FIG. 4, No. 1) in phase. FIG. 4 shows an example in which No. 12) is connected.
Next, the relationship between the hook 26 formed on the commutator piece 25 and the conductive wire 23 (the coil 23a and the short-circuit wire 23b) locked to the hook 26 will be described with reference to FIGS. 5 and 6 are both enlarged cross-sectional views of the vicinity of the commutator piece 25 in FIG. 2, FIG. 5 is a view when the conductor 23 is locked to the hook 26, and FIG. It is a figure when electrically connected. FIG. 7 is an explanatory diagram showing a winding form when the coil 23 a and the short-circuit wire 23 b are locked to the hook 26.

As shown in FIG. 5, the commutator piece 25 is provided with a seat 27 for fixing the hook 26, the coil 23a (conductive wire 23), and the short-circuit wire 23b (conductive wire 23). And the short circuit wire 23b is latched by the base side (left side of FIG. 5) of the hook 26, and the coil 23a is latched by this front end side (right side of FIG. 5). Here, a chamfered portion 26a2 is formed at a corner portion 26a1 of the coil locking portion 26a to which the coil 23a is locked, which is on the radially inner side of the hook 26 (the lower side in FIG. 5). A corner portion 26b1 is formed in the short-circuit wire locking portion 26b to which the wire 23b is locked.
As shown in FIGS. 5 and 6, the short-circuit wire 23 b is locked to the base side of the hook 26, the coil 23 a is locked to the tip side, and then the hook 26 is folded back in the clockwise direction toward the anti-iron core 22 side. It is bent and pressed onto the upper part of each conductive wire 23 (coil 23a, short-circuit wire 23b), and is crimped by melting the insulation coating and mechanical plastic deformation by, for example, fusing, thereby achieving electrical and mechanical connection. At this time, the short-circuit wire 23b is locked to the base side of the hook 26, and the hook 26 is bent. However, as shown in FIG. 6, the shape of the base side of the hook 26 is naturally rounded. The short-circuit line 23b is connected to the hook 26 along the line.

  4 is engaged with the hook 26 of the first commutator piece 25 and is disposed along the core side end surface 30a of the commutator 30 as shown in FIG. , No. 12 commutator piece 25 (the commutator piece 25 having the same potential as the No. 1 commutator piece 25) is connected to the hook 26. In the example of FIG. 4, only one is shown, but in practice, all the commutator pieces 25 corresponding to each other, for example, No. 2 and 13, No. 3 and No. 14,. The child pieces 25 are connected to each other by a short-circuit line 23b.

  Further, as shown in FIG. 7, when the winding form of the coil 23a and the short-circuit wire 23b locked to the commutator piece 25 (hook 26) is viewed, the drawing directions of the coils 23a and the coil 23a are different. In the part 26a, it is located in the radial direction outer side (the upper side of FIG. 5, the upper side with respect to the paper surface of FIG. 7) of the short-circuit wire 23b. And it is the coil latching | locking part 26a of the hook 26, Comprising: The coil 23a is wound over the chamfering part 26a2 and the circumferential direction side surface 26a3 from the radial inside, and it is latched by the hook 26.

  In the first embodiment, as shown in FIGS. 5 and 6, the seat portion 27 is provided on the anti-iron core 22 side, and a concave portion 27a for fixing the coil 23a and the concave portion 27a are provided, thereby providing the concave portion 27a. Further, it is formed by a stepped portion 27b that is formed so as to be continuous to the hook 26 side and can promote compressive deformation with respect to the short-circuit wire 23b. Further, the lower surface of the tip portion 26 c of the hook 26 is configured to abut on the right outer edge 28 of the recess 27 a constituting the seat portion 27.

As described above, the rotor 20 according to the first embodiment of the present invention has the plurality of slots 22b, the iron core 22 fixed to the shaft 21, the base resin 24 fixed to the shaft 21, and the base. A short circuit in which a commutator 30 including a plurality of commutator pieces 25 arranged in the circumferential direction on the outer peripheral surface of the resin 24, a coil 23a wound around a slot 22a, and the commutator pieces 25 that should have the same potential are connected to each other. The commutator piece 25 has a hook 26 formed on the iron core 22 side. The conductor 23 is locked to the hook 26, and the hook 26 is bent to connect the conductor 23 to the commutator piece 25. The rotor 20 is electrically connected, and the coil 23a is locked to the tip side of the hook 26, the short-circuit wire 23b is locked to the base side of the hook 26, and the coil 23a of the hook 26 is Locked The corner 26a1 of the coil engaging portion 26a, and the chamfered portion 26a2 is formed, the short-circuit wire engaging portion 26b of the short-circuit wire 23b is engaged in the hook 26, chamfering is not subjected corners 26b1 Since the corner portion 26b1 formed in the short-circuit wire locking portion 26b can suppress the decrease in rigidity when the hook 26 is bent in the clockwise direction on the anti-iron core 22 side, The reliability of the mechanical strength of the commutator piece 25 can be ensured. On the other hand, a chamfered portion 26a2 is formed at the corner portion 26a1 of the coil locking portion 26a, and the coil 23a is locked along the chamfered shape of the chamfered portion 26a2. In the 25 hooks 26, the gap between the coils 23a adjacent to each other in the circumferential direction, that is, the distance between the wires increases, and the insulation reliability between the adjacent coils 23a is improved.
Therefore, it is possible to provide a rotor 20 and a brushed motor (rotary electric machine) 100 including the rotor 20 with improved insulation reliability between adjacent coils 23a while ensuring the reliability of the mechanical strength of the commutator piece 25. be able to.

  In addition, according to the brushed motor 100 according to the first embodiment of the present invention, the rotor 20, the brush 43 that is in sliding contact with the surface of the commutator 30, and the stator 10 are provided. By increasing the distance between the adjacent coils 23a, the diameter of the outer peripheral surface of the commutator piece can be reduced, that is, the motor can be reduced in size. Therefore, when this brushed motor 100 is applied to a motor for an electric power steering apparatus, a motor for an electric power steering apparatus that does not impair steering feeling and steering wheel return by reducing the torque loss due to the miniaturization of the motor is provided. can do.

In addition, when a plurality of conductors, for example, two coils are locked to the hook, the winding direction of the two coils is the same, and the hook pulling portion is the same. In the first embodiment, the short-circuit wire 23b is connected to the commutator piece 25 (the first commutator in FIG. 4). The commutator piece 25 (FIG. 4) is locked to the hook 26 of the piece 25) and is disposed along the iron core side end face 30a of the commutator 30 and should have the same potential as the first commutator piece 25 in FIG. When the winding shape of the coil 23a and the short-circuit wire 23b locked to the commutator piece 25 is viewed, the drawing directions of the two are different. lead portion of the coil 23a is in the coil engaging portion 26a Since it positioned radially outward of the lead portion of the short-circuit line 23b, since the width of the loop coil retaining portion 26a is small, if the wire 23 including coil 23a and the short-circuit line 23b is engaged with the hook Even so, it is possible to provide the rotor 20 capable of ensuring the insulation reliability between the adjacent coils 23a and the rotating electrical machine 100 including the same.

  Further, according to the first embodiment of the present invention, the coil 23a is locked from the radially inner side of the hook 26 to the chamfered portion 26a2, and is wound around the entire circumference of the hook 26, whereby the coil 26a is engaged with the hook 26. Since the coil 23a is locked from the chamfered portion 26a2 of the hook 26 to the circumferential side surface 26a3, the coil 23a is in close contact with the hook 26, and the coil 26 is adjacent to the circumferential direction of the hook 26. The distance between the lines 23a is further increased, and the insulation reliability between the adjacent coils 23a is further improved.

In the first embodiment, the case where the chamfered portion 26a2 is formed at the corner portion 26a1 of the coil locking portion 26a to which the coil 23a is locked is shown on the inner side in the radial direction of the hook 26. However, the present invention is not limited to this case, and as shown in FIG. 8, each of the corner portions 36 a 1 of the coil locking portions 36 a on the radially inner side (lower side in FIG. 8) and the radially outer side (upper side in FIG. 8). A chamfered portion 36a2 may be formed on the surface. In this case, since the coil 23a is locked along the chamfered shape of the chamfered portion 36a2, in the hook 36 of the commutator piece 25, the line-to-line distance between the coils 23a adjacent to each other in the circumferential direction is further widened and adjacent. The insulation reliability between the coils 23a is further improved.
In addition, when the coil 23a is wound over the entire circumference of the hook 36, the coil 23a is locked so as to follow the chamfered shape of the chamfered portion 36a2, so that the coil 23a, the hook 36, and the Therefore, the distance between the adjacent coils 23a in the circumferential direction is further increased, and the insulation reliability between the adjacent coils 23a is further improved.

Further, in the first embodiment, the case where both the coil 23a and the short-circuit wire 23b are one as the conductive wire 23 locked to the hook 26 is shown, but the number of the coils 23a locked to the hook 26 and the short-circuit are shown. The number of the wires 23b is not limited to this case. For example, it is possible to adopt a double winding method so that the number of coils is plural. However, for example, when two coils are locked to the hook, the drawing directions of the two coils are the same, and thus the coil locked to the hook may spread in the circumferential direction as described above.
Therefore, of the two coils, the coil locked on the tip end side of the hook is positioned on the coil locking portion on the radially outer side of the coil locked on the base side of the hook, It is possible to increase the line-to-line distance between adjacent coils. Hereinafter, a case where the two coils 123a1 and 123a2 are locked to the hook 126 will be described with reference to FIGS. 9 and 10 are both enlarged cross-sectional views in the vicinity of the commutator piece 45. FIG. 5 is a view when the conducting wire 123 is locked to the hook 126. FIG. 10 is an electrical connection between the hook 126 and the conducting wire 123. FIG. FIG. 11 is an explanatory view showing a winding shape when the two coils 123a1, 123a2 and the short-circuit wire 123b are locked to the hook 126. FIG.

As shown in FIG. 9, a short-circuit wire 123b (conductive wire 123) is locked to the base side of the hook 125, and two coils 123a1 and 123a2 (conductive wire 123) are locked to the distal end side. Here, a chamfered portion 126a2 is formed at a corner portion 126a1 of the coil locking portion 126a, which is on the radially inner side of the hook 126 and to which the two coils 123a1 and 123a2 are locked, and a short-circuit wire 123b is formed. A corner portion 126b1 is formed in the short-circuit wire locking portion 126b to be locked.
Of the two coils 123a1 and 123a2, after the coil 123a1 (first coil) is locked to the coil locking portion 126a of the hook 126, the coil 123a2 (second coil) is locked to the coil locking portion 126a. It is locked to. The coil 123a2 is locked to the tip end side of the hook 126 relative to the coil 123a1, and is positioned between the circumferential side surface of the hook 126 and the radially outer side of the coil 123a1 while bending the coil 123a2 radially outward. It is wound around the slot 22b.

  As shown in FIGS. 9 and 10, the short-circuit wire 123 b is locked to the base side of the hook 126, and the two coils 123 a 1 and 123 a 2 are sequentially locked to the distal end side of the hook 126. Folded clockwise on the 22nd side and pressed onto the top of each conductive wire 123 (coils 123a1, 123a2, short circuit wire 123b), for example by fusing and crimping by melting the insulation coating and mechanical plastic deformation, Mechanical connection is achieved. At this time, the short-circuit wire 123b is locked to the base side of the hook 126, and the hook 126 is bent, but the shape of the base side of the hook 126 is naturally rounded as shown in FIG. The short-circuit line 123b is connected to the hook 126.

Further, as shown in FIG. 11, when the winding form of the two coils 123a1 and 123a2 locked to the commutator piece 45 (hook 126) is viewed, the coil 123a2 (second coil) is coil-related. in stop portion 126a, a radially outer coil 123A1 (first coil) is positioned (the upper side in FIG. 9, the upper to the plane of FIG. 11). And it is the coil latching | locking part 126a of the hook 126, Comprising: The coil 123a2 is wound over the chamfering part 126a2 and the circumferential direction side surface 126a3 from the radial inside, and it is latched by the hook 126.

From the above, the lead- out portion of the coil 123a2 (second coil) is locked to the hook 126 in the coil locking portion 126a on the radially outer side of the lead- out portion of the coil 123a1 (first coil). Looking at the winding form of the coils 123a1 and 123a2 (see FIG. 11), the coil 123a2 is located above the coil 123a1 (upward with respect to the paper surface of FIG. 11) in the radial direction, and the circumferential direction The rotor can be secured to the hook 126 without expanding, so that even when a plurality of coils are locked to the hook, the insulation reliability between adjacent coils can be ensured. 20 and the rotary electric machine 100 provided with the same can be provided.
In addition, in this coil locking portion 126a, a chamfered portion 126a2 is formed at the corner 126a1 of the coil locking portion 126a locked to the tip end side of the hook 126. Therefore, the coil 123a2 has the chamfered portion. Since it is latched along the chamfered shape of 126a2, the coil 123a2 can be bent in a state of being closer to the hook 126 as compared with the case where the chamfer is not formed, and the coil 123a2 (second coil) can be folded. Since the distance between the coils 123a2 adjacent in the circumferential direction is further increased, the insulation reliability between the adjacent coils 123a2 is further improved.
9 to 11, the chamfered portion 126a2 is formed at the corner 126a1 over the entire coil locking portion 126a where the two coils 123a1 and 123a2 are locked. However, the present invention is not limited to this case, and as described above, chamfered portions are formed at the corners of the coil locking portions for the radially inner side and the radially outer side of the hook. You may be allowed to.

  The rotating electrical machine 100 shown in the first embodiment of the present invention is a general rotating electrical machine including a brush 43 that is in sliding contact with the surfaces of the stator 10, the rotor 20, and the commutator 30, and relates to the present invention. The present invention can be applied to a brushed motor (electric motor) including a rotor having a configuration, and can also be applied to, for example, a generator such as an alternator or a motor generator having functions of an electric motor and a generator.

  10: Stator, 11: Yoke, 11a: Yoke circular pipe part, 11b, 40a: Bearing case part, 12: Holder, 13: Permanent magnet, 14, 41: Bearing, 20: Rotor, 21: Shaft, 22: Iron core, 22b: Slot, 23: Conductor, 23a, 123a1, 123a2: Coil, 23b, 123b: Short-circuit wire, 24: Base resin, 25, 45: Commutator piece, 26, 36, 126: Hook, 26a, 36a, 126a: coil locking portion, 26a1, 26b1, 36a1, 126a1, 126b1: corner portion, 26a2, 36a2, 126a2: chamfered portion, 26b, 126b: short-circuit wire locking portion, 30: commutator, 30a: iron core side end surface, 40: housing, 43: brush, 100: motor with brush (rotary electric machine).

Claims (6)

An iron core having a plurality of slots and fixed to the shaft; a base resin fixed to the shaft; and a commutator including a plurality of commutator pieces arranged circumferentially on the outer peripheral surface of the base resin; and the slots And a coil including a short-circuit wire to which commutator pieces to be at the same potential are connected to each other, and the commutator piece has a hook formed on the iron core side, and the hook And the hook is bent and electrically connected to the conductor, and the coil is locked to the tip end side of the hook, and the base side of the hook The short-circuit wire is locked to the corner portion of the coil locking portion where the coil of the hook is locked, and the short-circuit wire is locked to the short-circuit wire of the hook. the locking portion, corner chamfering is not applied Rotor, characterized in that There are formed. The short-circuit wire is locked to the hook of the commutator piece, is disposed along the iron core side end surface of the commutator, is connected to the commutator piece that should be at the same potential as the commutator piece, and 2. The rotor according to claim 1, wherein the lead- out portion is located radially outside the lead- out portion of the short-circuit line in the coil locking portion.   The rotor according to claim 1, wherein the coil is locked to the hook by being wound around the entire circumference of the hook.   The chamfering is formed in the corner | angular part of the coil latching | locking part inside the radial direction of the bent hook, The Claim 1 characterized by the above-mentioned. Rotor. The coil includes first and second coils locked to the coil locking portion, and the lead- out portion of the second coil locked to the tip end side of the hook from the first coil is a coil locking portion. 5. The rotor according to claim 1, wherein the rotor is located on an outer side in a radial direction of a drawing portion of the first coil.   A rotating electrical machine comprising: the rotor according to claim 1; a brush that is in sliding contact with the surface of the commutator; and a stator.

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