JP7222293B2 - stator - Google Patents

Description

The present disclosure relates to stators.

Patent Literature 1 discloses a stator used in a rotating electric machine. This stator includes a stator core and a plurality of rectangular coils attached to the teeth of the stator core. The rectangular coils are electrically connected to each other by connection wiring at one end of the rectangular coils.

JP 2009-118636 A

Various techniques have been proposed to reduce the size and increase the density of motors used in rotating electric machines as described above. As an example of such a technique, it is known to use a stator having a high-density coil as a coil to improve the space factor of the coil in a motor. For example, the stator described in Patent Literature 1 includes rectangular coils as high-density coils.

By the way, motors are sometimes required to be lighter in weight. On the other hand, as in the stator described in Patent Document 1, in a configuration in which coils such as rectangular coils attached to each tooth are electrically connected to each other, a space occupied by a conductor used for connection (hereinafter referred to as , also referred to as “conductor occupied space”), the axial dimension of the stator tends to increase. An increase in the axial dimension of the stator leads to an increase in the size of a peripheral device such as a case that accommodates the stator, which may hinder weight reduction of the motor.

This disclosure describes a stator that can reduce the weight of the motor.

A stator, which is one aspect of the present disclosure, includes an annular stator core having a plurality of teeth; and a second conductor connected to the second lead-out portion, the coil main body includes a first end surface that intersects a straight line along the center axis of the stator core, and the first lead-out portion includes , is pulled out from the coil body and protrudes away from the stator core more than the first end face, and the second lead-out part is pulled out from the coil body at a position spaced apart from the first lead-out part and is further away from the stator core than the first end face. The distance between the first lead-out portion and the second lead-out portion in the radial direction of the stator core is larger than the thickness of the coil main body.

In this stator, the space occupied by the conductor between the first lead-out portion and the second lead-out portion has a dimension larger than the thickness of the coil main body in the radial direction of the stator core. Therefore, conductors longer in the radial direction of the stator core can be employed as the first and second conductors, compared to the case where this dimension is equal to or smaller than the thickness of the coil main body. On the other hand, as the first conductor and the second conductor, those having a required cross-sectional area according to the amount of current used for the coil are employed. According to the above configuration, the cross-sectional length of the conductor in the radial direction of the stator core can be increased in order to secure the required cross-sectional area of the conductor, so the cross-sectional length of the conductor in the axial direction of the stator core can be shortened. Accordingly, the length of each of the first lead-out portion and the second lead-out portion drawn out from the coil body portion can be reduced. As a result, the entire stator can be shortened in the axial direction, and the size of the stator can be reduced. By miniaturizing the stator, it is possible to miniaturize a peripheral device such as a case for housing the stator, so that the weight of the motor can be reduced.

In one aspect of the stator, the coil main body has a second end face facing the central axis of the stator core, and a third end face positioned closer to the proximal end of the teeth than the second end face and facing the side opposite to the second end face. In addition, the first lead-out portion may include a portion that protrudes away from the central axis of the stator core more than the third end surface. In this case, the first lead-out portion protrudes in a direction away from the central axis of the stator core beyond the third end surface located on the base end side of the teeth (that is, on the yoke side of the stator core). Therefore, it is possible to increase the radial dimension of the conductor occupied space of the stator core by utilizing the region overlapping the yoke when viewed in the axial direction of the stator core.

In one aspect of the stator, the surface of the second lead-out portion facing the central axis of the stator core and the second end surface may be flush with each other. In this case, the second lead-out portion does not protrude from the coil body portion. Therefore, it is possible to secure a sufficient area for arranging the rotor.

A stator according to one aspect includes a first coil, a second coil, and a third coil as coils, a third conductor connected to the second coil, and a fourth conductor connected to the third coil. , the first conductor is connected to the first lead-out portion of the first coil, the second conductor is connected to the second lead-out portion of the first coil, and the first lead-out portion in the radial direction of the stator core and the second lead-out portion may be large enough to interpose the third conductor and the fourth conductor between the first conductor and the second conductor. In this case, the coils include a U-phase coil, a V-phase coil, and a W-phase coil, and one of these coils is wound around one tooth (so-called concentrated winding) to reduce the size of the stator. be able to.

In one aspect of the stator, the coil is composed of a wound coil conductor, and the lengths of the first lead-out portion and the second lead-out portion protruding from the first end face in the axial direction of the stator core are equal to the lengths of the coil conductor. may be smaller than the width of In this case, the dimension of the space occupied by the conductor in the axial direction of the stator core falls within a range smaller than the width of the coil conductor. Therefore, the stator can be sufficiently miniaturized.

ADVANTAGE OF THE INVENTION According to this invention, the stator which can achieve weight reduction of a motor is provided.

FIG. 1 is a cross-sectional view schematically showing a motor to which a stator according to an embodiment is applied. 2 is a perspective view showing the stator of FIG. 1. FIG. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 4 is a perspective view showing the coil of FIG. 1. FIG. 5 is a cross-sectional view showing an enlarged part of the stator of FIG. 1. FIG. FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. FIG. 7 is a perspective view showing a stator according to a comparative example. 8 is a cross-sectional view showing the stator of FIG. 7. FIG.

An embodiment will be described below with reference to the drawings. In the description of the drawings, the same elements or corresponding elements are denoted by the same reference numerals, and redundant description may be omitted.

A motor to which the stator according to the present embodiment is applied will be described with reference to FIG. The motor 1 shown in FIG. 1 is applied, for example, in the field of aerospace. In this embodiment, the motor 1 is a rotary aircraft motor and functions as a power source for a fuel pump (not shown). However, the motor 1 may be an automobile motor or the like. As shown in FIG. 1 , the motor 1 includes a shaft 2 to which an impeller (not shown) of a fuel pump is connected, a rotor 3 , a stator 4 and a case 5 .

The shaft 2 extends along the rotation axis of the motor 1 (hereinafter referred to as "axis Ax"). The shaft 2 is held by a pair of bearings 6 so as to be rotatable around the axis Ax. The rotor 3 has an annular shape. The inner peripheral surface of rotor 3 is fixed to the outer peripheral surface of shaft 2 between a pair of bearings 6 . The stator 4 surrounds the outer peripheral surface of the rotor 3 . Stator 4 generates a rotating magnetic field for rotating rotor 3 . Specifically, in the motor 1 , when an alternating current is supplied to the stator 4 , torque is generated in the rotor 3 by the rotating magnetic field of the stator 4 , and the shaft 2 rotates together with the rotor 3 . Details of the stator 4 will be described later.

The case 5 accommodates the rotor 3, the stator 4, and the like therein. The case 5 has, for example, a cylindrical shape. A stator 4 is fixed to the inner peripheral surface of the case 5 . The bearings 6 are attached to both ends of the case 5 in the direction along the axis Ax. The case 5 protrudes the shaft 2 to the outside through the bearing 6 . A cooling jacket (not shown) or the like for cooling the stator 4 may be further accommodated inside the case 5 . In this case, the cooling jacket may have an annular shape surrounding the stator 4 and may be fixed to the inner peripheral surface of the case 5 .

Case 5 constitutes the outer shape of motor 1 . In this embodiment, the motor 1 has a cylindrical shape. In the following description, the axial direction Da along the center axis (that is, the axis Ax) of the motor 1, the radial direction Db of the motor 1, and the circumferential direction Dc of the motor 1 (see FIG. 3) are used.

Details of the stator 4 will be described with reference to FIGS. 2 to 6. FIG. As shown in FIG. 2 , the stator 4 includes a stator core 41 , coils 42 and busbars 43 . The stator core 41 has an annular shape. A central axis of the stator core 41 coincides with the axis Ax. In addition, the axial direction, radial direction, and circumferential direction of the stator core 41 coincide with the axial direction Da, radial direction Db, and circumferential direction Dc, respectively. Therefore, hereinafter, the central axis of the stator core 41 is referred to as the "axis line Ax," the axial direction of the stator core 41 as the "axial direction Da," the radial direction of the stator core 41 as the "radial direction Db," and the circumferential direction of the stator core 41 as the "circumferential direction Dc." "There is a case. On one side of the stator core 41 in the axial direction Da, a connection region R (also see FIG. 5) used for electrical connection between the coils 42 and the busbars 43 is located.

As shown in FIGS. 2 and 3, the stator core 41 includes a cylindrical yoke 41a that surrounds the rotor 3 and extends along the axial direction Da, and a plurality of (for example, nine) teeth 41b arranged along the circumferential direction Dc. and Each tooth 41b protrudes in the radial direction Db from the inner peripheral surface of the yoke 41a. A slot 41c is formed between the teeth 41b adjacent to each other along the circumferential direction Dc.

The stator core 41 is, for example, a laminated iron core, and is formed by laminating a plurality of electromagnetic steel sheets. However, the stator core 41 may be a dust core or the like. Further, the stator core 41 may be formed integrally, or may be formed separately for each part. In this embodiment, the yoke 41a and the teeth 41b are divided and formed separately from each other. Specifically, the stator core 41 is formed by assembling the yoke 41a and the teeth 41b after the coils 42 and the like are attached to the teeth 41b (so-called dovetail groove division method). As a method for dividing the stator core 41, various known methods may be adopted.

The coil 42 is attached to the stator core 41 . The coil 42 is attached to each tooth 41b and arranged in the slot 41c. As shown in FIG. 4, the coil 42 is composed of a wound coil conductor. An insulating coating is applied to the surface of the coil conductor in a wound state. In addition, illustration of an insulating coating film is omitted in each figure. The coil 42 is formed by laminating a plurality of coil conductors and joining their ends together. The coil 42 may be formed, for example, by the manufacturing method described in Japanese Unexamined Patent Application Publication No. 2015-135955.

As the coil conductor, for example, a rectangular wire-like one can be used. The coil conductor has an elongated shape. Further, a cross section intersecting (for example, perpendicular to) the axial direction of the coil conductor has a rectangular shape. The coil conductor in this embodiment has a flat plate shape with a width greater than its thickness. However, the coil conductor may be rectangular. In other words, the coil conductor may have a square cross section that intersects (for example, is perpendicular to) the axial direction of the coil conductor. The coil 42 is also called a rectangular coil, and is an aster coil as an example, and may be an edgewise coil.

The coil 42 has a coil body portion 42a, a first lead portion 42b, and a second lead portion 42c. The coil body portion 42a surrounds the teeth 41b (see FIG. 5). The coil body portion 42a is constituted by the wound portion of the coil conductor. The outer shape of the coil body portion 42a is, for example, a truncated quadrangular pyramid shape. The outer shape of the coil body portion 42a is reduced, for example, from the base end side of the tooth 41b toward the tip end side of the tooth 41b. Insertion holes 42h through which the teeth 41b are inserted are formed in the coil main body 42a.

The coil body portion 42a includes a plurality of (here, six) end faces. As shown in FIGS. 4 and 5, the plurality of end faces include an end face 42s (first end face), an end face 42t (second end face), and an end face 42u (third end face). 42 s of end faces cross the straight line L1 in the connection area|region R (for example, orthogonally). Here, the straight line L1 is a line along the axis Ax. The shape of the end surface 42s is, for example, a trapezoidal shape. 42 s of end faces are comprised by the aggregate|assembly of the side surface of one side of a coil conductor.

As shown in FIGS. 5 and 6, the end surface 42t faces the axis Ax. In addition, the end surface 42t has a portion that intersects (for example, orthogonally) the straight line L2. Here, the straight line L2 is a line along the radial direction Db passing through the axis Ax and the center of the tooth 41b in the circumferential direction Dc. The end face 42u is located closer to the proximal end of the tooth 41b (that is, closer to the yoke) than the end face 42t, and faces the opposite side to the end face 42t. The end face 42u has a portion that intersects (for example, orthogonally) the straight line L2 at a position spaced apart from the end face 42t. As shown in FIG. 4, the end surfaces 42t and 42u each have an annular shape. Moreover, the outlines of the end faces 42t and 42u are each rectangular. The end surfaces 42t and 42u are each configured by a part of the main surface of the coil conductor. In this embodiment, the area of the end surface 42u is larger than the area of the end surface 42t.

The first lead-out portion 42b and the second lead-out portion 42c are led out from the coil body portion 42a in the connection region R, respectively. Further, the second drawer portion 42c is drawn out at a position separated from the first drawer portion 42b. The first lead-out portion 42b is configured by one winding end portion of the coil conductor. The second lead-out portion 42c is formed by the other winding end portion of the coil conductor. A part of the first lead-out portion 42b and the second lead-out portion 42c protrude in a direction away from the stator core 41 from the end surface 42s of the coil main body portion 42a. For example, as shown in FIG. 4, the length S1 by which the first lead-out portion 42b protrudes from the end surface 42s in the axial direction Da is smaller than the width B of the coil conductor. Also, the length S2 of the second lead-out portion 42c protruding from the end surface 42s in the axial direction Da is smaller than the width B of the coil conductor. The length S1 and the length S2 are, for example, the same size.

As shown in FIGS. 5 and 6, the busbar 43 is arranged in the stator 4 between the first drawn-out portion 42b and the second drawn-out portion 42c. In other words, a busbar occupied space S that can be occupied by the busbar 43 is formed between the first drawer portion 42b and the second drawer portion 42c. A distance t1 between the first lead-out portion 42b and the second lead-out portion 42c in the radial direction Db is larger than the thickness t2 of the coil body portion 42a. Furthermore, the dimension of the busbar occupied space S in the radial direction Db is larger than the dimension of the coil body portion 42a in the radial direction Db. For example, the interval t1 is a size that allows four bus bars 43 to be interposed between the first drawer portion 42b and the second drawer portion 42c.

In the present embodiment, the first lead-out portion 42b includes a portion that protrudes away from the axis Ax from the end surface 42u. Specifically, as shown in FIG. 5, the first drawer portion 42b has bent portions 42d and 42e, an inclined portion 42f, and an extending portion 42g. The bent portion 42 d is a portion bent away from the axis Ax and the stator core 41 from the coil body portion 42 a. The inclined portion 42f is a portion extending in the bent direction (here, the direction inclined with respect to the end surface 42u) at the bent portion 42d. The inclined portion 42 f may extend until it reaches the case 5 . The bent portion 42e is a portion that is bent away from the stator core 41 along the axis Ax from the inclined portion 42f. The extending portion 42g is a portion extending in the bent direction (here, the direction along the end surface 42u) at the bent portion 42e.

Further, in the present embodiment, the surface 42v of the second lead-out portion 42c facing the axis Ax and the end surface 42t of the coil body portion 42a are flush with each other. In other words, the second lead-out portion 42c extends along the axis Ax as a whole.

In the coil 42 according to this embodiment, the first lead-out portion 42b is bent at the bent portions 42d and 42e, so that the interval t1 is formed to be larger than the thickness t2. In the coil 42, the farther the position of the bent portion 42e from the axis Ax, the larger the interval t1. In other words, in the coil 42, the closer the inclined portion 42f extends to the case 5, the greater the interval t1. The position of the bent portion 42e may be brought closer to the case 5 in order to increase the interval t1.

The first lead-out portion 42b (bent portions 42d and 42e) of the coil 42 may be formed by bending the coil conductor. When forming the coil 42, from the viewpoint of ensuring the dielectric withstand voltage of the bent portions 42d and 42e, for example, after the bent portions 42d and 42e are bent, the insulating coating film is applied to the entire surface of the coil 42. be done. The insulating coating film at this time may be applied by an electrodeposition coating, or may be applied by an insulating coating.

In this embodiment, the stator 4 has a plurality of (here, nine) coils 42 . Each of the plurality of coils 42 includes coils 42A (first coils), coils 42B (second coils), and coils 42C (third coils) of the same number (here, three). The coils 42A, 42B, 42C have different phases. As an example, coil 42A is a U-phase coil, coil 42B is a V-phase coil, and coil 42C is a W-phase coil. As shown in FIG. 6, the coils 42A, 42B, 42C are arranged in this order along the circumferential direction Dc. Coils 42 of the same phase (coils 42A, coils 42B, and coils 42C) are separated by coils 42 of two different phases. That is, the coils 42B and 42C are interposed between the coils 42A adjacent to each other along the circumferential direction Dc.

Also, the coils 42 of the same phase (the coils 42A, the coils 42B, and the coils 42C) are electrically connected in the connection region R by the bus bar 43. FIG. In other words, the busbar 43 is electrically connected to the two coils 42 in the connection region R. The bus bar 43 and the coil 42 may be joined by soldering, by brazing, or by mechanical fastening or the like.

The bus bar 43 is configured by a conductive rectangular wire or rectangular wire. As shown in FIG. 5, a cross section (hereinafter referred to as "bus bar cross section 43s") intersecting the material axis direction of the bus bar 43 has a rectangular shape. The dimension Ba along the axial direction Da of the busbar cross section 43s may be 10 times or less, or 0.1 to 5 times, the dimension Bb along the radial direction Db of the busbar cross section 43s. As an example, it is 1.0 times. In addition, the shape of the busbar cross section 43s is not limited to a rectangular shape, and may be, for example, a round shape, an elliptical shape, or the like.

In this embodiment, the stator 4 has a plurality of (here, six) busbars 43 . As shown in FIGS. 2 and 6, each bus bar 43 extends from a first lead-out portion 42b of one coil 42, passes through two coils 42 of a phase different from that of the one coil 42, It extends to the second lead-out portion 42c of the coil 42 of the same phase as the coil 42 . The plurality of busbars 43 include a busbar 43A (first conductor), a busbar 43B (second conductor), a busbar 43C (third conductor), and a busbar 43D (fourth conductor).

The busbar 43A is electrically connected to the first lead-out portion 42b of the coil 42A. Specifically, one end of the bus bar 43A is electrically connected to the first lead-out portion 42b (especially the extension portion 42g shown in FIG. 5) of the one coil 42A. The other end of the bus bar 43A is electrically connected to the second lead-out portion 42c of the coil 42A adjacent to one side of the one coil 42A. The area of the joint between the busbar 43A and the first lead-out portion 42b may be larger than the busbar cross section 43s. Also, the area of the joint between the busbar 43A and the second lead-out portion 42c may be larger than the busbar cross section 43s.

The busbar 43B is electrically connected to the second lead-out portion 42c of the coil 42A. Specifically, one end of the bus bar 43B is electrically connected to the second lead-out portion 42c of the one coil 42A. The other end of the bus bar 43B is electrically connected to the first lead-out portion 42b (in particular, the extension portion 42g) of the coil 42A adjacent to the other side of the one coil 42A. The area of the joint between the busbar 43B and the second lead-out portion 42c may be larger than the busbar cross section 43s. Also, the area of the joint between the busbar 43B and the first lead-out portion 42b may be larger than the busbar cross section 43s.

The bus bar 43C is electrically connected to the coil 42B adjacent to the one coil 42A on the other side. Specifically, one end of the bus bar 43C is electrically connected to the first lead-out portion 42b (in particular, the extension portion 42g) of the coil 42B. The other end of the bus bar 43C is electrically connected to the second lead-out portion 42c of the coil 42B adjacent to one side of the coil 42B. The area of the joint between the busbar 43C and the first lead-out portion 42b may be larger than the busbar cross section 43s. Also, the area of the joint between the busbar 43C and the second lead-out portion 42c may be larger than the busbar cross section 43s.

The bus bar 43D is electrically connected to the coil 42C adjacent to one side of the one coil 42A. Specifically, one end of the bus bar 43D is electrically connected to the second lead-out portion 42c of the coil 42C. The other end of the bus bar 43D is electrically connected to the first lead-out portion 42b (in particular, the extension portion 42g) of the coil 42C adjacent to one side of the coil 42C. The area of the joint between the busbar 43D and the second lead-out portion 42c may be larger than the busbar cross section 43s. Also, the area of the joint between the busbar 43D and the first lead-out portion 42b may be larger than the busbar cross section 43s.

As shown in FIG. 5, the busbars 43A, 43B, 43C, 43D are arranged at positions overlapping each other in the axial direction Da. Of the plurality of busbars 43, the same applies to the plurality (here, five) of the busbars 43 other than the busbars 43A, 43B, 43C, and 43D. Therefore, as shown in FIGS. 5 and 6, the distance t1 between the first drawer portion 42b and the second drawer portion 42c in the radial direction Db is between the busbars 43A and 43B, and between the busbars 43C and 43D. is large enough to intervene.

The effects of the stator 4 described above will be described. First, a stator 4X according to a comparative example will be described with reference to FIGS. 7 and 8. FIG. The stator 4X differs from the stator 4 according to the present embodiment in that a coil 42X is provided instead of the coil 42 and a busbar 43X is provided instead of the busbar 43. As shown in FIG. The stator 4X is configured similarly to the stator 4 in other respects.

In the coil 42X, the distance t3 between the first lead-out portion 42b and the second lead-out portion 42c in the radial direction Db is equal to the thickness t2 of the coil body portion 42a. Here, the size of the busbar occupied space SX in the radial direction Db is the same as the thickness t2. In the coil 42X, neither the first lead-out portion 42b nor the second lead-out portion 42c is bent. Also, the bus bar 43X is composed of a flat plate-shaped rectangular wire having conductivity. As the bus bar 43X, one having a required cross-sectional area corresponding to the amount of current used for the coil 42 is employed. In this case, since the dimension of the busbar occupied space SX in the radial direction Db (that is, the interval t3) is relatively small, the busbar 43X must be relatively long in the axial direction Da. Therefore, the stator 4 as a whole tends to be elongated in the axial direction Da. As a result, the relatively large size of the case 5 and the like is applied, which may hinder the weight reduction of the motor 1 .

On the other hand, in the stator 4, the busbar occupied space S (conductor occupied space) between the first lead-out portion 42b and the second lead-out portion 42c is larger than the thickness t2 of the coil body portion 42a in the radial direction Db. have dimensions. Therefore, bus bars 43 (conductors) that are long in the radial direction Db can be employed as the bus bars 43A and 43B, compared to the case where this dimension (that is, the interval t1) is equal to or smaller than the thickness t2 of the coil main body 42a.

Here, as the busbars 43A and 43B, those having a required cross-sectional area corresponding to the amount of current used for the coil 42 are employed, as in the case of the busbar 43X. Therefore, among the bus bars 43 having a cross-sectional area similar to that of the bus bar 43X and ensuring the required cross-sectional area, the bus bar 43 that is shorter in the axial direction Da can be adopted. Accordingly, the length of each of the first lead-out portion 42b and the second lead-out portion 42c drawn out from the coil body portion 43a (that is, the dimension of the busbar occupied space S in the axial direction Da) can be reduced. As a result, the entire stator 4 can be shortened in the axial direction Da, and the size of the stator 4 can be reduced. By miniaturizing the stator 4, the peripheral equipment such as the case 5 that houses the stator 4 can be miniaturized. Therefore, by using the stator 4 in the motor 1, the weight of the motor 1 can be reduced while ensuring electrical performance equivalent to that in the case of using the stator 4X.

In the stator 4, the coil body portion 42a includes an end face 42t facing the axis Ax, and an end face 42u positioned closer to the proximal end of the teeth 41b than the end face 42t and facing the opposite side of the end face 42t. The first lead-out portion 42b includes a portion that protrudes in a direction away from the axis Ax from the end surface 42t. According to this configuration, the first lead-out portion 42b protrudes in a direction away from the axis Ax from the end face 42u located on the base end side of the tooth 41b (that is, on the yoke 41a side of the stator core 41). As a result, it is possible to increase the dimension of the busbar occupied space S in the radial direction Db by utilizing the region overlapping the yoke 41a when viewed in the axial direction Da.

In the stator 4, the surface 42v of the second lead-out portion 42c facing the axis Ax and the end surface 42t are flush with each other. According to this configuration, the second lead-out portion 42c does not protrude from the coil body portion 42a. As a result, a sufficient area for arranging the rotor 3 can be secured.

The stator 4 includes a coil 42A, a coil 42B, and a coil 42C as the coil 42, a busbar 43C electrically connected to the coil 42B, and a busbar 43D electrically connected to the coil 42C. The busbar 43A is electrically connected to the first lead-out portion 42b of the coil 42A. The busbar 43B is electrically connected to the second lead-out portion 42c of the coil 42A. A distance t1 between the first lead-out portion 42b and the second lead-out portion 42c in the radial direction Db is large enough to interpose the busbars 43C and 43D between the busbars 43A and 43B. According to this configuration, the coil 42 includes a U-phase coil (here, the coil 42A), a V-phase coil (here, the coil 42B), and a W-phase coil (here, the coil 42C). In a configuration in which one phase is wound around one tooth 41b (so-called concentrated winding), the size of the stator 4 can be reduced.

In the stator 4, the coils 42 are composed of wound coil conductors. Each length (length S1, S2) of the first lead-out portion 42b and the second lead-out portion 42c in the axial direction Da of the stator 4 is smaller than the width B of the coil conductor. According to this configuration, the dimension of the busbar occupied space S in the axial direction Da is within a range smaller than the width B of the coil conductor, so that the stator 4 can be made sufficiently compact.

Further, the coil conductor in this embodiment has a flat plate shape with a width greater than its thickness. According to this configuration, it is particularly easy to reduce the size of the stator 4 .

The above embodiment describes one embodiment of the stator according to the present invention. The stator according to the present invention can be any modification of the stator 4 described above.

For example, in the above-described embodiment, the first lead-out portion 42b includes a portion that protrudes away from the axis Ax more than the end surface 42u, and the surface 42v of the second lead-out portion 42c and the end surface 42t are flush with each other. bottom. However, the second lead-out portion 42c may include a portion that protrudes in a direction closer to the axis Ax than the end face 42t. In this case, the first lead portion 42b may include a portion that protrudes away from the axis Ax beyond the end surface 42u, or the first lead portion 42b as a whole may extend along the axis Ax. That is, the surface of the first lead-out portion 42b facing the case 5 may be flush with the end surface 42u.

Also, in the above embodiment, the coils 42 are electrically connected to each other by the busbar 43 , but the coils 42 may be electrically connected to each other by a conductor other than the busbar 43 . Electrical conductors other than the busbar 43 include electric wires (for example, magnet wires, twisted wires, etc.).

Also, the busbar occupied space S is not limited to being formed between the first drawer portion 42b and the second drawer portion 42c. For example, the bus bar 43 electrically connected to the first lead-out portion 42b may be arranged on the case 5 side in the radial direction Db of the first lead-out portion 42b. Also, the bus bar 43 electrically connected to the second lead-out portion 42c may be arranged on the rotor 3 side in the radial direction Db of the second lead-out portion 42c.

4, 4X Stator 41 Stator core 41a Yoke 41b Teeth 42, 42X Coil 42A Coil (first coil)
42B coil (second coil)
42C coil (third coil)
42a coil body portion 42b first lead-out portion 42c second lead-out portion 42s end face (first end face)
42t end face (second end face)
42u end face (third end face)
42v surface 43, 43X bus bar 43A bus bar (first conductor)
43B bus bar (second conductor)
43C bus bar (third conductor)
43D busbar (fourth conductor)
Ax axis (center axis)
Da Axial direction Db Radial direction Dc Circumferential direction R Connection region

Claims (4)

an annular stator core having a plurality of teeth;
a first coil, a second coil , and a third coil each having a coil main body portion surrounding the teeth, a first lead-out portion, and a second lead-out portion;
a first conductor connected to the first lead-out portion;
a second conductor connected to the second lead-out portion;
a third conductor connected to the second coil;
a fourth conductor connected to the third coil;
with
the coil main body includes a first end surface that intersects a straight line along the central axis of the stator core,
The first lead-out portion is drawn out from the coil body portion and protrudes in a direction away from the stator core from the first end face,
the second lead-out portion is led out from the coil main body at a position spaced apart from the first lead-out portion, and protrudes in a direction away from the stator core beyond the first end surface;
a distance between the first lead-out portion and the second lead-out portion in the radial direction of the stator core is larger than the thickness of the coil main body;
The first conductor is connected to the first lead-out portion of the first coil,
The second conductor is connected to the second lead-out portion of the first coil,
The distance between the first lead-out portion and the second lead-out portion in the radial direction of the stator core is such that the third conductor and the fourth conductor are provided between the first conductor and the second conductor. A stator that is of an intervening size . The coil main body is
a second end surface facing the central axis of the stator core;
a third end face positioned closer to the proximal end of the tooth than the second end face and facing the side opposite to the second end face,
2. The stator according to claim 1, wherein said first lead-out portion includes a portion that protrudes in a direction away from the central axis of said stator core more than said third end surface. 3. The stator according to claim 2, wherein a surface of the second lead-out portion facing the center axis of the stator core and the second end surface are flush with each other. The coil is composed of a wound coil conductor,
4. The length of each of the first lead-out portion and the second lead-out portion protruding from the first end face in the axial direction of the stator core is smaller than the width of the coil conductor. Stator as described in .

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