Stator, motor, and insulator

Abstract

To provide a stator using a conducting wire winding mode with which it is possible to increase the degree of freedom in selection of the wire diameter or teeth width of the conducting wire.SOLUTION: A stator uses a winding mode in which a conducting wire 23x wound around each of teeth 21b of a stator core 21 is arranged inclined with respect to a width direction of the conducting wire on both sides of the ends in an axial direction of each of the teeth 21b, and a change of the column for every one winding is performed on both sides in the axial direction of each of the teeth 21b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a stator, a motor, and an insulator. [Background technology]

[0002] In a known motor stator, a general round conductor is wound in multiple layers around the teeth of a stator core fitted with an insulator using aligned winding (see, for example, Patent Document 1). When multiple layers are formed by stacking an upper layer conductor that is wound later on top of a lower layer conductor that is wound earlier around the teeth, applying aligned winding of the conductor has advantages such as a high space factor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2021-509565 Summary of the Invention [Problem to be solved by the invention]

[0004] In the aligned winding of the conductor, as the winding of the same layer proceeds, the conductor is shifted radially by one wire from the position where it was previously wound around the tooth to the position where it will be wound next. When this type of conductor rearrangement is performed, a tensile force acts on the conductor in both the winding direction and the rearrangement direction. Therefore, when rearranging the conductor, the wound conductor is likely to collapse.

[0005] Conductor collapse is likely to occur during the winding process when multiple layers of conductors are stacked and the re-arrangement angle at which the conductor is tilted toward the next winding position is large. When multiple layers are wound, the re-arrangement angle gradually decreases as the number of layers increases, so there is a particular concern that the winding will collapse when the conductor is stacked and the re-arrangement angle is the largest during the second layer winding.

[0006] Furthermore, the wire diameter and tooth width are factors that determine the size of the reordering angle. The larger the wire diameter or the smaller the tooth width of the conductor, the larger the reordering angle must be set, which increases the risk of the conductor becoming unwound. Therefore, unless the winding mode of the conductor, including the reordering, is devised, there is a problem in that the freedom of selection of the wire diameter and tooth width of the conductor is reduced.

[0007] An object of the present disclosure is to provide a stator using a winding pattern of a conductor that allows for greater freedom in selecting the wire diameter and tooth width of the conductor, a motor using the stator, and an insulator used in the stator. [Means for solving the problem]

[0008] A stator according to one embodiment of the present disclosure comprises a stator core (21) having a plurality of teeth (21b), insulators (22, 22x, 22y) provided on the stator core in a portion including the teeth, and coils (23) formed by winding a conductor (23x) around the teeth via the insulators, in which the conductor is wound in multiple layers using concentrated winding while rearranging at the axial end sides of the teeth, and the conductor is arranged at an angle with respect to the width direction of the teeth on both sides of the axial end sides of the teeth, forming a winding pattern in which the rearrangement is shared between both axial sides of the teeth.

[0009] According to the above configuration, the conductor wound around the teeth of the stator core is arranged at an angle with respect to the width direction of the conductor on both sides of the axial end of the tooth, and the alignment change for each winding is shared between the axial sides of the tooth. In other words, when the conductor is arranged at an angle during the winding process, the individual inclination angles on both axial sides of the tooth can be set small, which reduces the risk of the conductor becoming unwound. This allows for greater freedom in selecting the wire diameter and tooth width, which are correlated with the inclination angle of the conductor.

[0010] A motor according to one aspect of the present disclosure includes the stator (11) described above. According to the above configuration, it is possible to increase the degree of freedom in selecting the wire diameter of the conductor used in the stator and the tooth width of the stator core, which is expected to increase the degree of freedom in the configuration of the motor.

[0011] An insulator according to one embodiment of the present disclosure is used in a stator (11) having a stator core (21) having a plurality of teeth (21b) and a coil (23) formed by winding a conductor (23x) around the teeth, and is an insulator (22, 22x, 22y) provided on the stator core in a portion including the teeth and wound with multiple layers of concentrated winding of the conductor, and has an arrangement groove (22f) that regulates the position of the conductor wound in the first layer so that the conductor is arranged at an incline with respect to the width direction of the tooth on both sides of the axial end of the tooth, and the winding pattern is such that the rearrangement of the conductor is shared between both axial sides of the tooth.

[0012] According to the above configuration, by winding the conductor along the arrangement groove of the insulator, which regulates the position of the conductor, it is possible to achieve a winding pattern in which the rearrangement of the conductor for each winding is shared between both axial sides of the teeth. In other words, by using the insulator, it is possible to easily achieve a winding pattern of the conductor that improves the freedom of selection of the wire diameter and tooth width of the conductor. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a stator of a motor according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the teeth portion of the stator in the same embodiment. [Figure 3] FIG. 3 is a side view of the teeth portion of the stator in the same embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a teeth portion of a stator in the same embodiment. [Figure 5] FIG. 5 is an axial view of the teeth portion of the stator in the same embodiment. [Figure 6] FIG. 6 is an axial view of the teeth portion of the stator in the same embodiment. [Figure 7] FIG. 7 is an axial view of the teeth portion of the stator in the same embodiment. [Figure 8] FIG. 8 is an axial view of the teeth portion of the stator in the same embodiment. [Figure 9] FIG. 9 is an explanatory diagram showing the effect of the winding mode of the stator in the same embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of a stator, a motor, and an insulator will be described below. (Configuration of motor 10) 1, motor 10 includes an annular stator 11 and a rotor (not shown) rotatably disposed radially inside stator 11. Stator 11 generates a rotating magnetic field on its inner circumferential surface facing the rotor when current is applied to coils 23 (described later) attached to stator 11. The rotor is rotated by the rotating magnetic field generated by stator 11.

[0015] (Configuration of stator 11) As shown in Figures 1 to 4, the stator 11 includes a circular stator core 21, an insulator 22 attached to the stator core 21, and a coil 23 attached to the stator core 21 via the insulator 22.

[0016] The stator core 21 is formed by laminating magnetic metal plates, for example. The stator core 21 has an annular portion 21a on the radially outer side and teeth 21b extending radially inward from the annular portion 21a. A plurality of teeth 21b are provided at equal intervals around the circumferential direction of the annular portion 21a.

[0017] As shown in FIG. 2, the stator 11 of this embodiment employs a split core. That is, the stator core 21 uses a plurality of split cores 21x, each split into one tooth 21b. The split cores 21x are set at the midpoint between circumferentially adjacent teeth 21b in the annular portion 21a of the stator core 21. An insulator 22 is attached to each split core 21x. The insulator 22 is configured as a pair, consisting of a first insulator 22x and a second insulator 22y, for each split core 21x. The first insulator 22x is attached to one axial side (hereinafter referred to as the upper side) of the tooth 21b. The second insulator 22y is attached to the other axial side (hereinafter referred to as the lower side) of the tooth 21b.

[0018] Before the split cores 21x are connected in an annular shape to form the stator core 21, a conductor 23x is wound around the teeth 21b from above the insulators 22 attached to the split cores 21x, and attached as the coils 23. In this embodiment, a general round wire with a circular cross section is used for the conductor 23x. The conductor 23x is wound around the teeth 21b of each split core 21x in a concentrated and aligned winding manner, with multiple layers stacked one on top of the other. The winding of the conductor 23x around the teeth 21b will be described in detail later.

[0019] After the coils 23 are attached to the teeth 21b, adjacent annular pieces 21c of the multiple split cores 21x that make up the stator 11 are connected together in an annular shape and fixed together as an annular portion 21a. The coils 23 wound around each tooth 21b are electrically connected by a three-phase wiring and are supplied with three-phase driving power from a motor control device (not shown), thereby generating a rotating magnetic field in the stator 11.

[0020] (Wounding of the conductor 23x around the teeth 21b) 5 and 6 show in detail how the conducting wire 23x is wound around the teeth 21b. Fig. 5 shows how the conducting wire 23x is wound around the upper side of the teeth 21b, and Fig. 6 shows how the conducting wire 23x is wound around the lower side of the teeth 21b.

[0021] In this embodiment, the winding of the conductor 23x is performed, for example, in three layers. The winding start position of the conductor 23x is set to the radially inner end position of the tooth 21b. The winding of the first layer of the conductor 23x is performed from the radially inner side of the tooth 21b to the radially outer side, while rearranging the winding so as to follow the outer surface of the insulator 22 attached to the tooth 21b. The winding of the second layer of the conductor 23x is performed from the radially outer side of the tooth 21b to the radially inner side, while rearranging the winding so as to follow the outer surface of the conductor 23x of the first layer. The winding of the third layer of the conductor 23x is performed from the radially inner side of the tooth 21b to the radially outer side, while rearranging the winding so as to follow the outer surface of the conductor 23x of the second layer.

[0022] (1st layer winding pattern) 5 and 2, a retaining groove 22a that holds the winding start portion of the conductor 23x is provided at a position near the radially inner end of the first insulator 22x. A retaining groove 22a is also provided in the second insulator 22y. The opening width of the retaining groove 22a is formed slightly narrower than the wire diameter of the conductor 23x, so that the winding start portion of the conductor 23x inserted into the opening can be held. The winding start portion of the conductor 23x is held in the retaining groove 22a. The winding positions of the conductor 23x on both sides of the width direction of the tooth 21b when viewed in the axial direction are numbered from "1" to "31" in FIGS. 5 and 6, with the winding start position of the conductor 23x held in the retaining groove 22a being "1". The conductor 23x is wound in the order of "1" to "11" in the first layer, "12" to "21" in the second layer, and "22" to "31" in the third layer. At position "1", the conductor 23x is arranged along the axial direction toward the lower side of the tooth 21b shown in FIG.

[0023] Below the tooth 21b shown in FIG. 6, the conductor 23x at position "1" is arranged so as to cross along the guide groove 22b provided in the second insulator 22y to position "2" on the opposite side of the tooth 21b in the width direction. The conductor 23x is arranged at position "2" closest to the guide portion 22c provided in the second insulator 22y. The guide portion 22c has a function of improving the alignment of the conductor 23x wound in a stacked manner in multiple layers. At position "2", the conductor 23x is arranged along the axial direction toward the upper side of the tooth 21b shown in FIG. 5.

[0024] 5, above the tooth 21b, the conductor 23x is arranged to cross from position "2" to position "3" on the opposite side of the tooth 21b in the width direction. In this case, the conductor 23x is arranged at an angle from position "2" to "3." At position "3," the conductor 23x is arranged along the axial direction toward the lower side of the tooth 21b shown in FIG.

[0025] Again, below the tooth 21b shown in FIG. 6, the conductor 23x is arranged so as to cross from position "3" to position "4" on the opposite side of the tooth 21b in the width direction. The conductor 23x is arranged so as to be inclined at the same angle from position "3" to "4" as from position "2" to "3" described above. At position "4", the conductor 23x is arranged along the axial direction toward the upper side of the tooth 21b shown in FIG. 5. In this way, the conductor 23x is wound around the tooth 21b once from position "2" to "4", and this is repeated from position "4" onwards to complete the first layer of winding up to position "11".

[0026] Furthermore, when winding the conductors 23x, the conductors 23x are rearranged by approximately one wire per one turn around the teeth 21b so that radially adjacent conductors 23x are aligned with a sufficiently small gap between them. In this embodiment, the rearrangement of the conductors 23x is performed both on the upper side of the teeth 21b shown in FIG. 5 and on the lower side of the teeth 21b shown in FIG. 6. That is, the inclination angle on the upper side of the teeth 21b shown in FIG. 5 and the inclination angle on the lower side of the teeth 21b shown in FIG. 6 are each radially shifted by approximately half the distance between adjacent conductors 23x (or the approximate wire diameter of the conductors 23x) per one turn. Therefore, it is possible to set each angle to a small value.

[0027] As a comparative example, in a typical winding pattern of the conductor 23x, the conductor 23x is rearranged by approximately one wire only on either the upper side of the tooth 21b shown in FIG. 5 or the lower side of the tooth 21b shown in FIG. 6. Therefore, it is necessary to set an inclination angle corresponding to the distance between adjacent conductors 23x in one winding on either the upper or lower side, so the set angle is approximately twice as large as in this embodiment. This is believed to be one of the major factors that lead to collapse of the conductor 23x when winding the conductor 23x. It is believed that the risk of collapse increases particularly in the second layer where the conductors 23x are stacked.

[0028] Furthermore, the first and second insulators 22x, 22y are provided with a plurality of radially aligned protrusions 22e with a generally triangular cross section at each of the corners between the axial end faces and side faces of the teeth 21b, i.e., at each of the four corners 22d around one circumference of the conductor 23x. Each protrusion 22e has a height, for example, approximately 1 / 2 to 1 / 3 of the wire diameter of the conductor 23x. Between adjacent radial protrusions 22e, a groove 22f is formed to accommodate a portion of the first-layer conductor 23x and regulate its position. Each groove 22f has a concave groove shape that can accommodate a portion of the round conductor 23x. Each groove 22f positions the corresponding conductor 23x and guides the aligned winding of the conductor 23x, including rearrangement, from positions "2" to "11." Furthermore, when winding the conductor 23x around the tooth 21b, the conductor 23x is bent starting from the four corners 22d of the first and second insulators 22x and 22y, and therefore is most likely to come into contact with each of the corners 22d. Therefore, it is effective to provide the ridges 22e and the arrangement grooves 22f that guide the conductor 23x only at each of the corners 22d.

[0029] (Second layer winding pattern) Below the tooth 21b shown in Fig. 6, the winding of the conductor 23x shifts from position "11" in the first layer to position "12" in the second layer. The conductor 23x at position "12" is arranged so that a portion of itself is inserted between the conductor 23x at position "10" in the first layer and the wall surface portion 22g of the second insulator 22y. The wall surface portion 22g is a portion of the second insulator 22y that covers the annular portion 21a of the stator core 21 and radially faces the guide portion 22c provided on the radially inner side.

[0030] Here, the conductor 23x at position "10" on the first layer is one position before position "11," which is closest to the wall surface 22g. In other words, the conductor 23x at position "10" is positioned slightly away from the wall surface 22g due to the inclination described above. The conductor 23x at the beginning of the second layer, position "12," is stacked with a portion of itself sandwiched between the wall surface 22g of the second insulator 22y and the conductor 23x at position "10" on the first layer, which is slightly spaced from the wall surface 22g. Therefore, there is a risk that the conductor 23x at position "12" will be excessively sandwiched between the wall surface 22g and the conductor 23x at position "10," which increases the concern that the alignment of the conductors 23x will be impaired.

[0031] In consideration of this, the second insulator 22y of this embodiment is provided with a pedestal portion 22h between the wall surface portion 22g and the conductor 23x at position "10." The pedestal portion 22h abuts against the conductor 23x at position "12" to prevent the conductor 23x at position "12" from excessively entering between the wall surface portion 22g and the conductor 23x at position "10," thereby stabilizing the position of the conductor 23x at position "12" in the second layer. At position "12," the conductor 23x is axially arranged toward the upper side of the tooth 21b shown in FIG. 5.

[0032] Above the tooth 21b shown in FIG. 5, the conductor 23x in the second layer is arranged to cross from position "12" to position "13" on the opposite side of the tooth 21b in the width direction. As in the first layer, the conductor 23x in the second layer is arranged at an angle from position "12" to "13". The conductor 23x at position "13" is positioned so that a portion of it enters the recess 23a between the conductors 23x at positions "9" and "11" in the first layer. At position "13", the conductor 23x is arranged in the axial direction toward the lower side of the tooth 21b shown in FIG.

[0033] Again, below the tooth 21b shown in FIG. 6, the second layer of conductor 23x is arranged to cross from position "13" to position "14" on the opposite side of the tooth 21b in the width direction. From position "13" to "14," the conductor 23x is arranged with an inclination equal to the inclination from position "12" to "13" described above. At position "14," the conductor 23x is arranged in the axial direction toward the upper side of the tooth 21b shown in FIG. 5. In this way, the conductor 23x is wound around the tooth 21b once from position "12" to "14," and this process is repeated from position "14" onward to complete the second layer of winding up to position "21" shown in FIG. 5. At position "21," the conductor 23x is arranged in the axial direction toward the lower side of the tooth 21b shown in FIG. 6.

[0034] The conductor 23x arranged at the start position "21" of the second layer is stacked with a portion of itself sandwiched between the guide portion 22c of the second insulator 22y and the conductor 23x at position "3" of the first layer, which is slightly spaced apart from the guide portion 22c. A pedestal portion 22i, which functions similarly to the pedestal portion 22h described above, is provided between the guide portion 22c of the second insulator 22y and the conductor 23x at position "3." The pedestal portion 22i abuts against the conductor 23x at position "21" to prevent it from excessively sandwiching between the guide portion 22c and the conductor 23x at position "3," thereby stabilizing the position of the conductor 23x at position "21" on the second layer.

[0035] (Third layer winding pattern) Below the tooth 21b shown in Fig. 6, the winding of the conductor 23x shifts from position "21" in the second layer to position "22" in the third layer. The conductor 23x at position "22" is positioned so that a portion of it is inserted between the conductor 23x at position "20" in the second layer and the guide portion 22c of the second insulator 22y. At position "22", the conductor 23x is positioned axially toward the upper side of the tooth 21b shown in Fig. 5.

[0036] Above the tooth 21b shown in FIG. 5, the conductor 23x in the third layer is arranged to cross from position "22" to position "23" on the opposite side of the tooth 21b in the width direction. As in the second layer, the conductor 23x in the third layer is arranged at an angle from position "22" to "23". The conductor 23x at position "23" is positioned so that a portion of it enters the recess 23a between the conductors 23x at positions "19" and "21" in the first layer. At position "23", the conductor 23x is arranged in the axial direction toward the lower side of the tooth 21b shown in FIG.

[0037] Again, below the tooth 21b shown in FIG. 6, the third layer of conductor 23x is arranged to cross from position "23" to position "24" on the opposite side of the tooth 21b in the width direction. The conductor 23x is arranged with an inclination from position "23" to "24" the same as the inclination from position "22" to "23" described above. At position "24," the conductor 23x is arranged in the axial direction toward the upper side of the tooth 21b shown in FIG. 5. In this way, the conductor 23x is wound around the tooth 21b once from position "22" to "24," and this process is repeated from position "24" onwards to complete the third layer of winding up to position "31" shown in FIG. 5.

[0038] (Setting the row change angle) As shown in Figures 7 and 8, in the three-layer aligned winding of the conductor 23x around the tooth 21b, when rearranging the conductor 23x in one winding, the winding is performed on both the upper and lower sides of the tooth 21b for all of the first to third layers.

[0039] Regarding the first layer, focusing on the winding pattern of one turn of the conductor 23x from positions "2" to "4" as a representative, the inclination angle α1 of the conductor 23x from position "2" to "3" relative to the reference line L1 is set to the same angle as the inclination angle α2 of the conductor 23x from position "3" to "4." In this case, the reference line L1 is a line that passes through the center of the intermediate position "3" and is perpendicular to the radial direction.

[0040] Here, the realignment of the conductor 23x means that the conductor 23x is shifted by one wire in the radial direction at the axial end of the tooth 21b during one winding around the tooth 21b. Therefore, the realignment angle of the conductor 23x can be calculated from the wire-to-wire distance between adjacent conductors 23x during one winding, relative to the winding diameter of the conductor 23x in the width direction of the tooth 21b as viewed in the axial direction. The calculation formula is realignment angle = arctan (wire-to-wire distance / winding diameter distance).

[0041] That is, the realignment angle α of the conductor wires 23x in the first layer is set from the inter-wire distance P of adjacent conductor wires 23x in one winding with respect to the winding diameter distance B1 of the conductor wires 23x in the width direction of the tooth 21b as viewed in the axial direction (for example, the inter-wire distance of the conductor wires 23x between positions "2" and "3"). In this embodiment, the realignment is performed shared between both the upper and lower sides of the tooth 21b, so the inclination angle α1 of the upper side of the tooth 21b and the inclination angle α2 of the lower side of the tooth 21b have the relationship expressed by the following equation: α=α1+α2. Furthermore, in this embodiment, the inclination angle α1 and the inclination angle α2 are set to the same angle, so the relationship also expresses the following equation: α1=α2=α / 2.

[0042] Similarly, for the second layer, attention is focused on the winding pattern of one turn of the conductor 23x from position "16" to "18" as a representative. The inclination angle β1 of the conductor 23x from position "16" to "17" relative to the reference line L2 is set to the same angle as the inclination angle β2 of the conductor 23x from position "17" to "18". The reference line L2 is a line that passes through the center of the intermediate position "17" and is perpendicular to the radial direction.

[0043] The realignment angle β of the conductor wires 23x in the second layer is set from the inter-wire distance P of adjacent conductor wires 23x in one winding, relative to the winding diameter distance B2 of the conductor wires 23x in the width direction of the tooth 21b when viewed in the axial direction (for example, the inter-wire distance of the conductor wires 23x between positions "16" and "17"). In this embodiment, the inclination angle β1 of the upper side of the tooth 21b and the inclination angle β2 of the lower side of the tooth 21b are related by the following equation: β=β1+β2, and further, are related by the following equation: β1=β2=β / 2.

[0044] Next, similarly for the third layer, pay attention to the winding pattern of one turn of the conductive wires 23x at positions "28" to "30" as a representative. The inclination angle γ1 of the conductive wire 23x facing from position "28" to "29" with respect to the reference line L3 and the inclination angle γ2 of the conductive wire 23x facing from position "29" to "30" are set to the same angle. The reference line L3 is a line passing through the center of the middle position "29" and orthogonal to the radial direction.

[0045] The column replacement angle γ of the conductive wires 23x in the third layer is set based on the wire-to-wire distance P of the adjacent conductive wires 23x in one turn with respect to the winding diameter distance B3 of the conductive wires 23x in the width direction of the teeth 21b in the axial direction view (for example, the wire-to-wire distance of the conductive wires 23x between positions "28" and "29"). In the present embodiment, the upper inclination angle γ1 of the teeth 21b and the lower inclination angle γ2 of the teeth 21b are in the relationship of the following formula γ = γ1 + γ2, and further in the relationship of the following formula γ1 = γ2 = γ / 2.

[0046] Also, since the winding diameter distances B1, B2, and B3 of the conductive wires 23x from the first layer to the third layer are in the relationship of the following formula B1 < B2 < B3, the column replacement angles α, β, and γ are in the relationship of the following formula α > β > γ. That is, as can be seen from the above-described calculation formula for the column replacement angle, as the number of layers increases, the column replacement angles α, β, and γ gradually decrease. And regarding the collapse of the winding of the conductive wires 23x, it is considered that it is particularly likely to occur during the winding of the second layer where the conductive wires 23x are stacked and the column replacement angle is the largest.

[0047] That is, when the conductor wire 23x in the first layer is wound with a large reordering angle α, it is wound directly onto the resin insulator 22, and furthermore, the insulator 22 has an arrangement groove 22f formed therein, so it is believed that the conductor wire 23x in the first layer is less likely to collapse. Furthermore, when the conductor wire 23x in the third layer is wound with a small reordering angle γ, the small angle allows the conductor wire 23x in the third layer to more stably fit into the center of the recess 23a between the conductor wires 23x in the second layer below, so the conductor wire 23x in the third layer is less likely to collapse. In this embodiment, the conductor wires 23x are stacked in three layers, but even when the number of layers is three or more, the arrangement of the conductor wires 23x becomes more stable and the winding is less likely to collapse as the number of layers increases. In contrast, the winding of the conductor 23x in the second layer, which is wound onto the conductor 23x and has a large row change angle β, is the most likely to cause the conductor 23x to collapse out of all three layers, and there are concerns about the conductor 23x in the second layer collapsing.

[0048] (Action of this embodiment) The operation of this embodiment will be described. In light of the above, in this embodiment, the inclination angles β1 and β2 that constitute the rearrangement angle β of the second layer are set in consideration of the limit value at which winding collapse is likely to occur. Next, the inclination angles α1 and α2 that constitute the rearrangement angle α of the first layer and the inclination angles γ1 and γ2 that constitute the rearrangement angle γ of the third layer are set.

[0049] 9 shows the results of a comparison between the present invention, in which the winding pattern performs the realignment on both the upper and lower sides of the teeth 21b, and a comparative example, in which the winding pattern performs the realignment on only one of the upper and lower sides of the teeth 21b. It can be seen that the inclination angles β1 and β2 that contribute to the realignment angle β of the second layer in this embodiment are sufficiently large relative to the limit value at which the winding collapses easily occurs for a given diameter of the conductor 23x. In other words, since there is sufficient margin for the inclination angles β1 and β2 even when the diameter of the conductor 23x is increased, it can be said that there is a high degree of freedom in selecting the wire diameter.

[0050] Although not shown, as the winding radial distance B2 of the conductor 23x in the width direction of the tooth 21b when viewed in the axial direction (see FIG. 7, etc.) decreases, the reordering angle β of the second layer increases. However, it can be inferred that the inclination angles β1 and β2 that contribute to the reordering angle β, as in this embodiment, have a sufficient margin relative to the limit value at which winding collapse is likely to occur for a given wire diameter of the conductor 23x. In other words, it can be inferred that there is a sufficient margin for the inclination angles β1 and β2 even if the winding radial distance B2 of the conductor 23x is reduced, i.e., the width dimension of the tooth 21b is reduced, and it can be said that there is a high degree of freedom in selecting the tooth width.

[0051] (Effects of this embodiment) The effects of this embodiment will be described. (1) The conductor 23x wound around the teeth 21b of the stator core 21 is arranged at an inclination with respect to the width direction of the conductor 23x on both sides of the axial end of the tooth 21b, and the realignment for each winding is shared between the axial ends of the tooth 21b. In other words, when the conductor 23x is arranged at an inclination during the winding process, the individual inclination angles on both sides of the axial end of the tooth 21b, such as the inclination angles β1 and β2 of the second layer, which are a high risk of winding collapse, can be set small, thereby reducing the risk of winding collapse of the conductor 23x. This allows for greater flexibility in selecting the wire diameter and tooth width of the conductor 23x, which are correlated with the inclination angles β1 and β2 of the conductor 23x. This is also expected to increase the flexibility in designing the motor 10.

[0052] (2) When rearranging the conductor 23x, the inclination angles β1, β2, etc. on both axial sides of the tooth 21b are set to the same angle, which is expected to facilitate winding of the conductor 23x.

[0053] (3) By winding the conductor 23x along the arrangement groove 22f of the insulator 22, which regulates the position of the conductor 23x, it is possible to achieve a winding pattern in which the rearrangement of the conductor 23x for each winding is shared between both axial sides of the teeth 21b. In other words, the above-described winding pattern of the conductor 23x can be easily achieved by using the insulator 22.

[0054] (4) The arrangement grooves 22f of the insulator 22 are provided only at the four corners 22d around the teeth 21b around which the conductor 23x is wound. When winding the conductor 23x around the teeth 21b, the conductor 23x is bent starting from one of the four corners 22d of the insulator 22, and therefore is most likely to come into contact with each corner 22d. In other words, providing arrangement grooves 22f that guide the conductor 23x only at each corner 22d is effective, and is expected to have the effect of improving the degree of freedom in the shape of parts of the insulator 22 other than the corners 22d.

[0055] (5) The insulator 22 has a holding groove 22a for holding the conductor 23x, and the winding start portion of the conductor 23x is held in the holding groove 22a, which is expected to have the effect of facilitating winding of the conductor 23x.

[0056] (6) The insulator 22 has base portions 22h, 22i that prevent the second-layer conductor 23x from entering excessively into the first layer, and the position of the conductor 23x is restricted by contact with the base portions 22h, 22i. This stabilizes the position of the second-layer conductor 23x, improving the alignment of the conductor 23x.

[0057] (Example of change) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0058] The above-described configuration of the insulator 22 is an example and may be modified as appropriate. For example, the arrangement grooves 22f of the insulator 22 are provided only at the four corners 22d around the teeth 21b around which the conductor wires 23x are wound, but the shape and position of the arrangement grooves 22f may be changed as appropriate, or may be omitted.

[0059] Furthermore, the insulator 22 is provided with the holding groove 22a for holding the lead wire 23x at the start of winding, but the shape and position of the holding groove 22a may be changed as appropriate, or the holding groove 22a may be omitted. Furthermore, the insulator 22 is provided with pedestal portions 22h, 22i to prevent the second layer conductor 23x from entering the first layer excessively, but the shape and position of the pedestal portions 22h, 22i may be changed as appropriate, or may be omitted.

[0060] Furthermore, although the insulator 22 is divided into two parts in the axial direction, that is, the first and second insulators 22x and 22y, it may be possible to use an insulator that is not divided in the axial direction. Furthermore, although the insulator 22 is attached to the stator core 21 in the above embodiment, the insulator 22 may be integrally formed with the stator core 21 .

[0061] When rearranging the conducting wires 23x, the inclination angles β1, β2, etc. are set to the same angle on both axial sides of the teeth 21b, but the angles may be different on the upper and lower sides of the teeth 21b to share the rearrangement angle.

[0062] Although split cores 21x are used in the stator core 21, a non-split core previously formed into an annular shape may also be used. In this case, the insulators 22 may be provided for each tooth 21b, or may be integral with the stator core 21 in the circumferential direction.

[0063] In addition to the above, the configuration of the motor 10 may be changed as appropriate. (Addendum) The technical ideas that can be understood from the above-described embodiment and modified examples will be described.

[0064] [1] a stator core (21) having a plurality of teeth (21b); an insulator (22, 22x, 22y) provided on the stator core in a region including the teeth; a coil (23) formed by winding a conducting wire (23x) around the teeth via the insulator, The conductor wire is wound in multiple layers in concentrated winding while rearranging at the axial end side of the teeth, and the stator (11) The conductor wires are arranged on both sides of the axial ends of the teeth at an incline with respect to the width direction of the teeth, and are wound in a manner such that the rearrangement is shared between both axial sides of the teeth.

[0065] [2] The stator according to [1] above, wherein the inclination angles (β1, β2, etc.) of the conducting wires on both sides of the axial direction of the teeth are set to the same angle when the rows are rearranged.

[0066] [3] The stator according to the above [1] or [2], wherein the rearrangement angle (β, etc.) when rearranging the conductors is set to be smaller than a limit value using rearrangement angle = arctan (wire distance / winding diameter distance), and the rearrangement angle (β) calculated from the wire distance (P) of adjacent conductors in one winding and the winding diameter distance (B2) of the conductors in the second layer in the width direction of the teeth.

[0067] [4] The insulator has a placement groove (22f) that regulates the position of the conductor, The stator according to any one of the above [1] to [3], wherein the conducting wire is wound along the arrangement groove of the insulator.

[0068] [5] The stator according to [4] above, wherein the arrangement grooves of the insulator are provided only at four corners (22d) around the teeth around which the conducting wires are wound.

[0069] [6] The insulator has a holding groove (22a) for holding the conductor wire, The stator according to any one of the above [1] to [5], wherein the winding start portion of the conducting wire is held in a holding groove of the insulator.

[0070] [7] the insulator has a base portion (22h, 22i) that prevents the second layer of the conductor from excessively entering the first layer, The stator according to any one of the above [1] to [6], wherein the conducting wire is configured so that its position can be regulated by contact with the base portion of the insulator.

[0071] [8] A motor comprising the stator (11) according to any one of the above [1] to [7].

[0072] [9] An insulator (22, 22x, 22y) is used in a stator (11) including a stator core (21) having a plurality of teeth (21b) and a coil (23) formed by winding a conductor (23x) around the teeth, the insulator (22, 22x, 22y) being provided on the stator core in a portion including the teeth and wound with a plurality of layers of concentrated winding of the conductor, An insulator having an arrangement groove (22f) that regulates the position of the conductor wound in the first layer so that the conductor is arranged at an incline with respect to the width direction of the tooth on both sides of the axial end of the tooth, and the winding pattern is such that the rearrangement of the conductor is shared between both axial sides of the tooth. [Explanation of symbols]

[0073] 11 stator, 21 stator core, 21b teeth, 22 insulator, 22f arrangement groove, 22x first insulator, 22y second insulator, 23 coil, 23x conducting wire

Claims

1. a stator core (21) having a plurality of teeth (21b); an insulator (22, 22x, 22y) provided on the stator core in a portion including the teeth; a coil (23) formed by winding a conducting wire (23x) around the teeth via the insulator, The conductor wire is wound in multiple layers by concentrated winding while rearranging at the axial end side of the teeth, The conductor wires are arranged on both sides of the axial ends of the teeth at an incline with respect to the width direction of the teeth, and are wound in a manner such that the rearrangement is shared between both axial sides of the teeth.

2. 2. The stator according to claim 1, wherein the inclination angles (β1, β2, etc.) of the conducting wires on both axial sides of the teeth are set to the same angle when the rows are rearranged.

3. 2. The stator according to claim 1, wherein a rearrangement angle (β, etc.) when rearranging the conductors is set to be smaller than a limit value, using rearrangement angle = arctan (wire distance / winding diameter distance), and calculated from the wire distance (P) of adjacent conductors in one winding and the winding diameter distance (B2) of the conductors in the second layer in the width direction of the teeth.

4. The insulator has a placement groove (22f) that regulates the position of the conductor, The stator according to claim 1 , wherein the conductor wire is wound along an arrangement groove of the insulator.

5. 5. The stator according to claim 4, wherein the arrangement grooves of the insulator are provided only at four corners (22d) around the teeth around which the conducting wires are wound.

6. The insulator has a holding groove (22a) for holding the conductor, 2. The stator according to claim 1, wherein a winding start portion of the conductor wire is held in a holding groove of the insulator.

7. the insulator has a base portion (22h, 22i) that prevents the second layer of the conductor from excessively entering the first layer, 2. The stator according to claim 1, wherein the position of the conductor wire can be restricted by contact with the base portion of the insulator.

8. A motor comprising a stator (11) according to any one of claims 1 to 7.

9. An insulator (22, 22x, 22y) is used in a stator (11) including a stator core (21) having a plurality of teeth (21b) and a coil (23) formed by winding a conductor (23x) around the teeth, the insulator (22, 22x, 22y) being provided on the stator core in a portion including the teeth and wound with a plurality of layers of concentrated winding of the conductor, The insulator has an arrangement groove (22f) that regulates the position of the conductor wound in the first layer so that the conductor is arranged at an incline with respect to the width direction of the tooth on both sides of the axial end of the tooth, and the winding pattern is such that the rearrangement of the conductor is shared between both axial sides of the tooth.

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