JP2011172440A - Stator of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate assembly while reducing an iron loss when annular stator cores with the same number of slots are each constituted of split cores. <P>SOLUTION: In the slots 14, widths in the peripheral direction of all bottoms are equalized substantially to those of insertions 15a, and the intervals of the bottoms of the adjacent slots 14 are formed equally. Each split core 12 has three teeth, and both side faces of a center tooth 13a are abutted against side faces in the peripheral directions of the insertions. The teeth 13b positioned on both sides of the tooth 13a are formed so that side faces on the sides corresponding to the tooth 13a are extended parallel to the center lines L1 of the tooth 13a. In the split cores 12, the insertions 15a are insertably formed to the slots 14 when the split cores 12 are moved in such a way that the respective teeth 13b and tooth 13a move toward between the adjacent insertions 15a, from the outside of the insertions 15a, while arranging distributed winding coils 15 so that the respective insertions 15a are radially extended at an equal interval. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stator of a rotating electrical machine, and more particularly to a stator of a split core type rotating electrical machine in which a plurality of split cores are joined to form an annular stator core.

  As a stator of a split core type rotating electrical machine, there is one in which a plurality of split cores having the same shape are connected to form an annular stator core (see, for example, Patent Document 1). In patent document 1, as shown to Fig.9 (a), (b), the split core 40 protrudes toward the axial center of the stator core 41 from the yoke part (yoke part) 40a and the yoke part 40a. One slot 42 is formed at the center between the two teeth 40b, and half slots 42a constituting half of the slot 42 are formed on both sides in the circumferential direction. Then, one slot 42 is constituted by two half slots 42a facing each other of the adjacent divided cores 40 connected in an annular shape. Further, the split core 40 is positioned at one end in the circumferential direction of the yoke portion 40a and is inclined monotonously toward the circumferentially projecting side as it is displaced radially outward, and the other circumferential end of the yoke portion 40a. A soft magnetic thin plate material having an inclined divided surface 43b that monotonously inclines toward the circumferentially retreating side as it is displaced radially outward and turned upside down and laminated every predetermined number. And the yoke part 40a of the two division | segmentation cores 40 adjacent to the circumferential direction has the fan-shaped wrap part 44 which overlaps with an axial direction by turns in an axial direction.

JP 2009-11063 A

  However, in the stator of the prior art split core type rotating electrical machine, the number of divisions is ½ of the number of slots. For example, when the number of slots is 48, the number of divisions is 24 and the stator core 41 is formed. However, since 24 divided cores 40 are required and the number of divisions is large, there is a problem that assembly is complicated. Further, in general, a split-core type stator has a problem that eddy currents are likely to occur in the yoke portions between adjacent split cores, and that the iron loss increases when the number of divisions is large.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to facilitate assembly and reduce iron loss when an annular stator core having the same number of slots is composed of divided cores. An object of the present invention is to provide a stator for a rotating electric machine that can perform the above.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a stator core having an annular shape, wherein teeth and slots are alternately formed along the inner circumference in the circumferential direction at the bottom of the slot. A stator of a rotating electrical machine including a distributed winding coil that is configured by a plurality of divided cores and is wound around the teeth. The slots are formed so that the circumferential width of all the bottoms including the clearance is the same as the circumferential width of the outer diameter side end of the insertion portion to the slot of the distributed winding coil. The split core has three or more teeth, and at least one of the teeth has one of the side surfaces in contact with the circumferential side surface of the insertion portion and between the other side surface and the circumferential side surface of the insertion portion. The gap is formed so as to be wider toward the tip of the teeth, and at least one of the teeth is in contact with the side surface in the circumferential direction of the insertion portion.

  In the stator of the present invention, the distributed winding coil is inserted into the stator core slot by moving the split core straight from the outside in a state where the distributed winding coil is annularly arranged at the time of manufacture (assembly). The stator is formed by being inserted without hindrance. Since each divided core has three or more teeth, when the number of slots of the stator core is the same as in the prior art, the number of divided cores constituting the stator core is 2/3 or less, and the stator is easily assembled. At the same time, by reducing the number of divisions, it is possible to reduce the total iron loss in all the divided portions.

  According to a second aspect of the present invention, in the first aspect of the present invention, the slot is formed such that an interval between bottoms of adjacent slots is the same, and the insertion portion has an outer diameter side end portion of the slot. The slot is accommodated in the slot so as to extend in the radial direction from the axial center of the stator core in contact with the bottom, and each of the divided cores is formed with at least the teeth and the slot in the same shape. The circumferential width of the proximal end is the same, and the circumferential width of the distal end is narrower than the circumferential width of the proximal end. Here, “at least the teeth and the slots are formed in the same shape” is not limited to the case where the entire divided core has the same shape, and the shape of the yoke portion (the yoke portion) continuous to the teeth may be different. Means that.

  According to the present invention, when the stator is manufactured, the distributed cores that have been shaped are arranged so that each insertion portion extends in the radial direction at equal intervals. The insertion portion of the distributed winding coil can be inserted into the slot without any trouble to form the stator. The “distributed wound coil that has been shaped” means a distributed wound coil that has been shaped into a state that does not require shaping after being assembled to the stator core.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a rectangular wire is used as the winding of the distributed winding coil. In the present invention, the space factor of the coil can be improved as compared with the case of using a winding having a circular cross section or an elliptical cross section.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the divided core has an odd number of teeth, and the teeth located in the center have both side surfaces as described above. The insertion portion is formed so as to abut on the side surface in the circumferential direction, and at least one of the two teeth positioned between the teeth includes a side surface corresponding to the tooth positioned at the center and the insertion portion. It is formed in a shape in which a gap that becomes wider toward the tip end side of the teeth is generated between the side surface in the circumferential direction.

  In this invention, the ratio of the width of the tooth tip where one side surface abuts on the circumferential side surface of the insertion portion with respect to the width of the tooth tip surface where both side surfaces abut on the circumferential side surface of the insertion portion has an even number of teeth. It can be made larger than the split core formed so that both side surfaces of the two teeth positioned closer to the center are in contact with the circumferential side surface of the insertion portion. However, the comparison is performed under the condition that the outer diameter and inner diameter of the stator core are the same, and the number of slots and the circumferential width of the slot bottom are the same.

  The invention according to claim 5 is the invention according to claim 4, wherein all the teeth arranged on the outer side in the circumferential direction from the teeth positioned in the center of the divided core are teeth positioned in the center of the divided core. A gap that becomes wider toward the tip of the teeth is formed between the corresponding side surface and the circumferential side surface of the insertion portion. Therefore, when the divided teeth are assembled, the coil insertion portion easily enters the slot, and the assembly is facilitated.

  The invention according to claim 6 is the invention according to claim 5, wherein the divided core has three teeth, and both teeth positioned on both sides of a symmetrically formed center tooth are The side surface corresponding to the tooth located in the center is formed so as to extend in parallel to the center line of the tooth located in the center. In this invention, when the outer diameter and inner diameter of the stator core are the same, and the number of slots and the circumferential width of the slot bottom are compared under the same conditions, the side surfaces of the teeth positioned on both sides of the teeth positioned in the center and the center line Compared with the case where the distance is formed so as to increase toward the tip of the tooth, the total value of the widths of all the tips of the teeth is increased. Therefore, the magnetic flux generated by the current flowing through the distributed winding coil is efficiently converted into the rotational torque of the rotor via the teeth.

  According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the teeth positioned on both sides of the center tooth are formed symmetrically with respect to the center line of the teeth positioned in the center. . In the present invention, unlike the case where it is not symmetrical, it is possible to assemble the split core without any trouble in assembling without checking whether or not the split core is turned upside down.

  The invention according to an eighth aspect is the invention according to any one of the first to third aspects, wherein the divided core has an even number of the teeth, and includes two teeth located in the center. At least one of the two side surfaces is formed so as to contact the circumferential side surface of the insertion portion. In the present invention, each divided core has three or more teeth and an even number of teeth. Therefore, when the number of slots of the stator core is the same as in the prior art, the number of divided cores constituting the stator core is 1/2 or less. As a result, the stator can be assembled more easily, and the total iron loss at the divided portions can be further reduced by reducing the number of divisions.

  The invention according to claim 9 is the invention according to claim 8, wherein the split core has four teeth, and two teeth positioned closer to the center have both side surfaces in the circumferential direction of the insertion portion. The two teeth that are formed so as to abut on the side surface and sandwich the teeth are located near the center of the two teeth that are located closer to the center and the side surface corresponding to the side closer to the center. It is formed so that it may extend in parallel with the side surface. In the present invention, when the outer diameter and inner diameter of the stator core are the same, and the number of slots and the circumferential width of the bottom of the slot are compared under the same conditions, the total value of the widths of all the teeth tips is equal to that of the split core having an even number of teeth. It becomes the maximum in.

  According to the present invention, when an annular stator core having the same number of slots is formed of divided cores, it is possible to provide a stator for a rotating electrical machine that can be easily assembled and reduced iron loss.

The 1st Embodiment is shown, (a) is a schematic cross section of a stator, (b) is the elements on larger scale of (a). The schematic diagram which shows the relationship between the teeth at the time of assembling a split core, and an insertion part. The schematic diagram which shows the relationship between the teeth of 2nd Embodiment, and an insertion part. The schematic diagram which shows the relationship between the teeth of 3rd Embodiment, and an insertion part. The schematic diagram which shows the relationship between the teeth of 4th Embodiment, and an insertion part. The schematic diagram which shows the relationship between the teeth and insertion part of another embodiment. (A) is a schematic diagram which shows the relationship between the split core of another embodiment, and an insertion part, (b) is a schematic diagram of the stator of another embodiment. (A) is a schematic diagram which shows the relationship between the split core of another embodiment, and an insertion part, (b) is a schematic diagram of the stator of another embodiment. (A) is a partial schematic cross-sectional view of a conventional stator, and (b) is a perspective view of a split core.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a stator used in a three-phase eight-pole motor with distributed winding will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1A, the stator 10 includes a stator core 11 formed in an annular shape by connecting a plurality (24 in this embodiment) of divided cores 12, and teeth 13 and slots 14 are formed of the stator core 11. They are alternately formed in the circumferential direction. A distributed winding coil 15 is wound around the stator core 11 in a state in which the insertion portion 15a is incorporated (inserted) in the slot 14.

  When the split core 12 is moved straight from the outside in a state where the shaped distributed winding coils 15 are arranged so that each insertion portion 15a extends in the radial direction at equal intervals, the split portion 12a is inserted into the split core 12. Is formed in a shape that can be inserted into the slot 14.

  More specifically, the split core 12 has a shape in which the stator core 11 is split in the circumferential direction at the position of the bottom of the slot 14 and all the split cores 12 have the same shape. The split core 12 has an odd number (three in this embodiment) of teeth 13 provided on the inner diameter side of the yoke portion 12a, an even number (two in this embodiment) of slots 14 and two as partial slots. Half-slot 14a. The teeth 13 are composed of a teeth 13a located at the center and two teeth 13b located on both sides of the teeth 13a. The teeth 13a located in the center are formed symmetrically with respect to the center line L1, and the teeth 13b located on both sides of the teeth 13a are formed symmetrically with respect to the center line of the teeth 13a. Each tooth 13a, 13b has the same circumferential width at the proximal end, the circumferential width at the distal end is narrower than the circumferential width at the proximal end, and the teeth distal end of the stator core 11 from the inner diameter side end of the insertion portion 15a. It is formed to protrude on the axial center side.

  The teeth 13a are formed such that the center line L1 of the teeth 13a extends toward the axis (center) O of the stator core 11 in a state where the divided core 12 forms the stator core 11. The teeth 13a are formed so that both side surfaces 16a abut on the circumferential side surface of the insertion portion 15a. The side surfaces 16a of the teeth 13a constituting a part of the slot 14 are formed by inserting the slot 15 into the slot 14 so that the angle formed with the center line L1 is in contact with the wall surface thereof (that is, the side surface 16a of the teeth 13a). The center line is formed to have a value for positioning so as to extend toward the axis O of the stator core 11.

  As shown in FIGS. 1 (a) and 1 (b), the two teeth 13b positioned with the teeth 13a sandwiched between the side surface 17a on the side corresponding to the teeth 13a and the circumferential side surface of the insertion portion 15a. A gap that is wider toward the teeth tip side is formed. The side surface 17b opposite to the side surface 17a, that is, the side surface 17b constituting a part of the half slot 14a is formed so as to abut on the circumferential side surface of the insertion portion 15a, and is in contact with the side surface 17b. The inserted insertion portion 15a is formed so as to be positioned so that the center line extends toward the axis O of the stator core 11. Both teeth 13b are formed so that the side surface 17a on the side corresponding to the teeth 13a extends in parallel with the center line L1 of the teeth 13a, and when the divided core 12 is assembled to the insertion portion 15a, the divided core 12 is assembled. It is possible to move smoothly toward.

  The split core 12 has two slots 14 located on both sides of the teeth 13a, and two half slots 14a located on the opposite side of the slots 14 with respect to the teeth 13b. The half slot 14a forms the slot 14 in a state where the adjacent divided cores 12 are coupled. The slots 14 are formed so that all the bottoms have the same circumferential width, and the intervals (pitch) between the bottoms of adjacent slots 14 are the same. The slot 14 has the same width on the back side (the side opposite to the axis O of the stator core 11) and the width on the opening side (the axis O side of the stator core 11), and the width on the opening side. Some are formed wider than the width on the back side. In this embodiment, the slot 14 formed by the opposing half slots 14a of the adjacent split cores 12 is formed so that the width on the opening side is the same as the width on the back side.

  The distributed winding coil 15 is formed such that the circumferential width of the insertion portion 15 a into the slot 14 is the same as the circumferential width of the bottom portion of the slot 14 and the clearance. “The same including clearance” means that the value obtained by adding the clearance between the insertion portion 15a and the slot wall surface (the minute clearance necessary for inserting the insertion portion 15a into the slot 14) to the width of the insertion portion 15a. It means substantially (almost) the same as the circumferential width.

  As the clearance value, a value that is appropriate in the technical field when the slot 14 is formed is adopted. The distributed winding coil 15 is accommodated in the slot 14 so as to extend in the radial direction from the axial center of the stator core 11 with the outer diameter side end of the insertion portion 15 a in contact with the bottom of the slot 14. That is, the distributed winding coil 15 is incorporated in the slot 14 with the center line of the insertion portion 15 a extending toward the axis O of the stator core 11 and arranged at an equal pitch in the circumferential direction of the stator core 11. The distributed winding coil 15 uses a rectangular wire as a winding.

Next, a manufacturing method (assembly method) of the stator 10 will be described.
When the stator 10 is manufactured (assembled), a support tool is used so that the insertion portions 15a extend in the radial direction at equal intervals so that the shaped distributed winding coil 15 is in the same state as shown in FIG. Arranged in a ring. Next, the divided cores 12 are arranged outside the distributed winding coil 15 arranged in an annular shape so that the teeth 13a face the center of the distributed winding coil 15 (the same position as the axis O of the stator core 11 shown in FIG. 1). . Then, the center of the teeth 13a in the state where the split core 12 faces the center of the insertion portion 15a in which the center line L1 of the teeth 13a is annularly arranged (the same position as the axis O of the stator core 11 shown in FIG. 1). Move straight along line L1. The teeth 13b located on both sides of the teeth 13a do not move toward the center of the insertion portion 15a arranged in an annular shape (the same position as the axis O of the stator core 11 shown in FIG. 1). The side surface 17a is formed in parallel with the center line L1. Therefore, as shown by a two-dot chain line in FIG. 2, the teeth 13a and 13b interfere with the insertion portion 15a even when the teeth 13a move in a state where the teeth 13a enter the space formed by the adjacent insertion portions 15a. As shown by the solid line in FIG. 2, the outer diameter side end portion of the insertion portion 15 a is accommodated in the slot 14 in contact with the bottom portion of the slot 14. When all the split cores 12 are assembled to the distributed winding coil 15, the adjacent split cores 12 are joined together in the circumferential direction to form the annular stator core 11. Thereafter, the divided portions are fixed by welding or the like, and the manufacture of the stator 10 is completed.

  Instead of forming the side surface 17a of both teeth 13b in parallel with the center line L1 of the teeth 13a, the distance between the side surface 17a and the center line L1 is greater than when the side surfaces 17a of both teeth 13b are parallel to the center line L1 of the teeth 13a. However, even if it forms so that it may become so wide as the front end side of the teeth 13b, the division | segmentation core 12 can be assembled | attached to the insertion part 15a without trouble, but the width | variety of the front-end | tip of the teeth 13b becomes narrow. That is, when the side surfaces 17a of both the teeth 13b are formed parallel to the center line L1 of the teeth 13a, the split core 12 can be assembled to the insertion portion 15a without hindrance, and the total width of the tips of the teeth 13b is maximized. .

According to this embodiment, the following effects can be obtained.
(1) The stator 10 has an annular shape, and a plurality of stator cores 11 in which teeth 13a and 13b and slots 14 are alternately formed along the inner circumference are divided in the circumferential direction at the bottom portion of the slots 14. And a distributed winding coil 15 wound around the teeth 13a and 13b. The slots 14 are formed so that the circumferential widths of all the bottoms thereof are substantially the same as the circumferential widths of the outer diameter side ends of the insertion portions into the slots of the distributed winding coils, including the clearance. The split core 12 has three or more teeth 13a and 13b, and at least one of the teeth has one of the side surfaces in contact with the circumferential side surface of the insertion portion 15a and the other side surface and the circumferential side surface of the insertion portion 15a. A gap that becomes wider toward the tip of the teeth is formed between them, and at least one of the teeth is in contact with the side surface in the circumferential direction of the insertion portion 15a. Therefore, when the number of slots of the stator core 11 is the same as that of the prior art, the number of the split cores 12 constituting the stator core 11 is 2/3 or less, and the stator 10 can be easily assembled and the number of splits is reduced. The total iron loss at all the divided points can be reduced.

  (2) The slots 14 are formed with the same interval between the bottoms of the adjacent slots 14, and the insertion portion 15 a extends from the axial center O of the stator core 11 with the outer diameter side end abutting against the bottom of the slot 14. Is accommodated in the slot 14 so as to extend in the radial direction. Each of the split cores 12 is formed in the same shape, and each of the teeth 13a and 13b has the same circumferential width at the proximal end and a smaller circumferential width at the distal end than the circumferential width at the proximal end. . Therefore, the assembly of the stator 10 becomes easier, and moreover, only one type of the split core 12 constituting the stator core 11 is required.

(3) Since a rectangular wire is used as the winding of the distributed winding coil 15, the space factor of the coil can be improved as compared with the case where a winding having a circular cross section or an elliptical cross section is used.
(4) The split core 12 has an odd number of teeth 13a and 13b, and the teeth 13a located at the center are formed such that both side surfaces 16a abut on the circumferential side surface of the insertion portion 15a. In the two teeth 13b located between the teeth 13a, a gap that becomes wider toward the distal end side of the teeth 13b is generated between the side surface 17a on the side corresponding to the teeth 13a and the circumferential side surface of the insertion portion 15a. It is formed into a shape. Therefore, the ratio of the tip width of the teeth 13b in which one side surface 17b contacts the circumferential side surface of the insertion portion 15a to the tip width of the teeth 13a in which both side surfaces 16a abut on the circumferential side surface of the insertion portion 15a It can be made larger than a split core that is formed so that both side surfaces of the two teeth located near the center are in contact with the circumferential side surface of the insertion portion. However, the comparison is made under the condition that the outer diameter and inner diameter of the stator core 11 are the same, and the number of slots and the circumferential width of the slot bottom are the same.

  (5) In the split core 12, the teeth 13a located in the center are formed symmetrically with respect to the center line L1, and the teeth 13b located on both sides of the teeth 13a are located left and right with respect to the center line L1 of the teeth 13a. It is formed symmetrically. Therefore, the total value of the widths of all the teeth tips is provided with the same number of teeth, and the teeth 13b positioned on both sides of the center positioned teeth 13a are formed symmetrically with respect to the center line L1 of the teeth. When compared with no split core, the total value is larger. Therefore, the magnetic flux generated by the current flowing through the distributed winding coil 15 is efficiently converted into the rotational torque of the rotor via the teeth 13a and 13b.

  (6) The split core 12 has three teeth 13a and 13b, and the teeth 13b located on both sides of the teeth 13a located at the center have side surfaces 17a corresponding to the teeth 13a on the center line L1 of the teeth 13a. It is formed so as to extend in parallel. Therefore, when the outer diameter and inner diameter of the stator core 11 are the same, and the number of slots and the circumferential width of the slot bottom are compared under the same conditions, the distance between the side surface 17a of the tooth 13b and the center line L1 increases toward the tip of the tooth 13b. Compared with the case where it forms in this way, the total value of the width | variety of all the teeth front-end | tips becomes large. As a result, the magnetic flux generated by the current flowing through the distributed winding coil 15 is more efficiently converted into the rotational torque of the rotor via the teeth 13a and 13b.

  (7) The split core 12 is formed such that both side surfaces 16a of the teeth 13a located in the center are formed symmetrically with respect to the center line L1 of the teeth 13a and abut against the circumferential side surface of the insertion portion 15a. ing. Therefore, when the split core 12 is assembled to the distributed winding coil 15, if the split core 12 is moved so that the tip of the teeth 13a is directed between the adjacent insert portions 15a, the insert portion 15a in which the center line L1 is arranged in an annular shape. The insertion portion 15a is inserted into the slot 14 without any trouble even if it is moved from a position other than the position where it extends straight toward the center (axial center), and the outer diameter side end portion of the insertion portion 15a is in contact with the bottom portion of the slot 14 become.

  (8) Since each of the split cores 12 has the same number of teeth 13a and 13b, compared to a case where a plurality of types of split cores having different numbers of teeth are used as the split core 12 constituting the stator core 11, the design of the rotating electrical machine The degree of freedom increases.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In this embodiment, each divided core 12 has a total of three teeth 13a and 13b, all the divided cores 12 are formed in the same shape, and the teeth 13a located in the center are located with respect to the center line L1. It is the same as in the first embodiment in that it is formed symmetrically, and both side surfaces 16a are formed so as to contact the circumferential side surface of the insertion portion 15a. However, the shape of the teeth 13b located on both sides of the teeth 13a is greatly different from that of the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the teeth 13b located on one side (the right side in FIG. 3) of the teeth 13a are formed so that both side surfaces 16a abut on the circumferential side surfaces of the insertion portion 15a in the same manner as the teeth 13a. Has been. That is, in the split core 12, the center line L2 of the slot 14 formed between the teeth 13a and the teeth 13b located on one side of the teeth 13a coincides with the center line of the insertion portion 15a inserted into the slot 14 It is formed in a state to do. Moreover, the side surface 17a of the side corresponding to the teeth 13a of both the teeth 13b is formed in parallel with each other.

  Then, when the split core 12 is assembled to the shaped distributed winding coil 15, the split core 12 is different from the first embodiment so that the center line L1 of the teeth 13a is directed toward the center of the insertion portion 15a arranged in an annular shape. Do not move it straight. As shown by a two-dot chain line in FIG. 3, the split core 12 has a center line L2 of the slot 14 formed between the teeth 13a and the teeth 13b located on one side of the teeth 13a, and the center of the insertion portion 15a. Move straight in line with the line. Thereby, the split core 12 smoothly moves to a predetermined assembly position while the side surface 16a of the tooth 13a and the side surface 17a of the one tooth 13b are in sliding contact with the insertion portion 15a.

Therefore, according to this 2nd Embodiment, in addition to the effect similar to (1)-(3) and (8) of 1st Embodiment, the following effects can be acquired.
(9) Although the teeth 13b located on both sides of the teeth 13a are not formed symmetrically with respect to the center line L1 of the teeth 13a, both teeth 17a and 17b of the teeth 13b are circumferential side surfaces of the insertion portion 15a. The side surfaces 17a on both sides of the teeth 13b corresponding to the teeth 13a are formed in parallel with each other. Therefore, the total value of the widths of all the teeth tips is the same as in the first embodiment, and the magnetic flux generated by the current flowing through the distributed winding coil 15 is efficiently rotated through the teeth 13a and 13b. Is converted to

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. In this embodiment, the point that all the divided cores 22 are formed in the same shape is the same as in both the above embodiments, but the configuration of the divided core 22 is different from both the above embodiments, and the other configurations are the same. . The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the split core 22 includes an even number (four in this embodiment) of teeth 23, an odd number (three in this embodiment) of slots 14, and two half slots as partial slots. 14a. The teeth 23 are composed of two teeth 23a located closer to the center and two teeth 23b located outside both teeth 23a. Each of the teeth 23a and 23b is located with respect to the center line L3 of the split core 22. Are symmetrically formed. Each tooth 23a, 23b has the same circumferential width at the proximal end, the circumferential width at the distal end is narrower than the circumferential width at the proximal end, and the teeth distal end of the stator core 11 from the inner diameter side end of the insertion portion 15a. It is formed to protrude on the axial center side.

  The split core 22 is formed such that the center line L3 extends toward the axis (center) O of the stator core 11 in a state where the stator core 11 is formed. The teeth 23a are formed so that both side surfaces 26a abut on the circumferential side surface of the insertion portion 15a. The both side surfaces 26a of the teeth 23a constituting a part of the slot 14 have an angle formed with the center line L3 of the insertion portion 15a inserted into the slot 14 in a state of contacting the wall surface (that is, the side surface 26a of the teeth 23a). The center line is formed to have a value for positioning so as to extend toward the axis O of the stator core 11. The two teeth 23b located between the two teeth 23a are such that the side surface 27a on the side corresponding to the teeth 23a extends parallel to the side surface 26a closer to the center of the two teeth 23a, that is, the side surface 26a on the center line L3 side. The side surface 27b opposite to the side surface 27a is formed in contact with the circumferential side surface of the insertion portion 15a.

  When the split core 22 is assembled to the shaped distributed winding coil 15, the split core 22 has the center line L3 of the split core 22 coincident with the center line of the insertion portion 15a as shown by a two-dot chain line in FIG. Move straight in the state you want. As a result, the split core 12 is smoothly brought to a predetermined assembly position while the side surfaces 26a of both teeth 23a are in sliding contact with the insertion portion 15a, and the side surfaces 27a of both teeth 23b are in sliding contact with the outer diameter side end of the insertion portion 15a. Moving.

Therefore, according to this 3rd Embodiment, in addition to the effect similar to (1)-(3) and (8) of 1st Embodiment, the following effects can be acquired.
(10) Since each divided core 22 has three or more teeth 23a and 23b and an even number, the number of divided cores 22 constituting the stator core 11 is smaller when the number of slots of the stator core 11 is the same as that of the prior art. It becomes 1/2 or less, the assembly of the stator 10 becomes easier, and the total iron loss of the divided portions can be further reduced by reducing the number of divisions.

  (11) The split core 22 has four teeth 23a and 23b, and the two teeth 23a positioned closer to the center are formed such that both side surfaces 26a abut on the circumferential side surface of the insertion portion 15a. Further, the two teeth 23b positioned between the teeth 23a are formed such that the side surface 27a on the side corresponding to the teeth 23a extends in parallel with the side surface 26a closer to the center of the two teeth 23a. Therefore, when the outer diameter and inner diameter of the stator core 11 are the same, and the number of slots and the circumferential width of the slot bottom are compared under the same condition, the total width of the tips of all the teeth 23a, 23b is an even number of teeth 23. It becomes the maximum among the divided cores 22 having.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. In this embodiment, each divided core 22 has a total of four teeth 23a and 23b, and all the divided cores 22 are formed in the same shape as in the third embodiment. The configuration of 22 is different from that of the third embodiment, and the other configurations are the same. The same parts as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, only one of the teeth 23a (right side in FIG. 5) of the teeth 23a near the center line L3 of the split core 22 has its both side surfaces 26a in contact with the circumferential side surface of the insertion portion 15a. The center line L4 of the teeth 23a extends toward the axial center (center) O of the stator core 11. That is, the split core 22 is formed such that the center line L3 coincides with the center line of the insertion portion 15a inserted into the slot 14. The remaining three teeth 23a and 23b have side surfaces 26a and 27a on the center line L4 side formed in parallel to the center line L4.

  When the split core 22 is assembled to the shaped distributed winding coil 15, the split core 22 has a center line L4 that is the same as the center of the insertion portion 15a arranged in an annular shape (the axis O of the stator core 11 shown in FIG. 1). In a state of being directed to (position), it is moved straight along the center line L4. As a result, in the split core 12, both side surfaces 26a of one tooth 23a are in sliding contact with the insertion portion 15a, and the side surfaces 26a and 27a on the center line L4 side of the remaining three teeth 23a and 23b are outer diameters of the insertion portion 15a. It smoothly moves to a predetermined assembly position while being in sliding contact with the side end.

Therefore, according to the fourth embodiment, the same effects as (1) to (3), (8) of the first embodiment and (10) of the third embodiment can be obtained.
The embodiment is not limited to the above, and may be embodied as follows, for example.

  O The number of teeth that the split core 12 has is not limited to three or four, and may be five or more. However, the number of teeth of the split core 12 is preferably a value that can divide the number of teeth of the stator core 11. However, when the number of teeth of the split core 12 is 5 or more, the outer diameter of the stator core 11, the thickness of the yoke portion 12a (the length in the radial direction), the length of the teeth, and the depth of the slot 14 are the first implementation. If the shape is the same, the widths of the tips of the teeth located at both ends of the split core 12 are too narrow. For example, when the split core 12 has five teeth 13a and 13b, the outer diameter of the stator core 11, the thickness of the yoke portion 12a, the length of the teeth 13a and 13b, and the depth of the slot 14 are the same as those in the first embodiment. If it makes the same, as shown with a dashed-two dotted line in FIG. 6, the width | variety of the front-end | tip of the teeth 13b located in both ends will become too narrow. However, for example, as indicated by solid lines in FIG. 6, the lengths of the teeth 13a and 13b and the radial length of the slot 14 are shortened, and the number of windings constituting the insertion portion 15a is correspondingly reduced. If the number of layers is reduced from 10 layers to 7 layers, the widths of the tips of the teeth 13b located at both ends of the split core 12 become larger than necessary. The greater the number of teeth the divided core 12 has, the smaller the number of divisions. However, the upper limit depends on the outer diameter of the stator core, the thickness of the yoke portion, the length of the teeth, the depth of the slot, and the required length of the tip width of the teeth. Determined.

  The dividing part of the stator core 11 may be a position at the bottom of the slot 14, and the dividing surface is not limited to a configuration extending in the radial direction at the center of the bottom of the slot 14. For example, as shown in FIG. 7A, the dividing surface 18 may be formed so as to extend in the radial direction in a state of being located on one end side of the bottom portion of the slot 14 (left end side in FIG. 7A). . In this configuration, the slot 14 positioned between the adjacent split cores 12 is not configured by two half slots 14 a, but one wall surface of the slot 14 is formed in one split core 12, and the other slot 14 is Are formed on the other split core 12. In this case, the configuration is the same as that of the first embodiment except that the split core 12 is not formed in a line-symmetric shape, and the same effect as that of the first embodiment can be obtained.

  The stator core 11 has an annular shape, teeth and slots are alternately formed along the inner circumference in the circumferential direction, and is composed of a plurality of divided cores divided in the circumferential direction at the bottom of the slot. The teeth and the slots may have the same shape, for example, a configuration as shown in FIG. In this case, the basic shape of the stator core 11 is the same, and the two types of split cores 12A and 12B formed on the one end side of the bottom portion of the slot 14 are not located at the center of the bottom portion of the slot 14 in the radial direction. Combined to form a ring. There may be four or more teeth.

  The stator core 11 does not have to be composed of the divided cores 12 having the same number of teeth, and may be composed of the divided cores 12 having different numbers of teeth. For example, you may comprise from the split core 12 with 3 teeth, and the split core 12 with 4 teeth.

  The dividing surface 18 of the stator core 11 is not limited to the configuration extending in the radial direction. For example, as shown in FIG. 8, one end of each divided core 12 constituting the dividing surface 18, in FIG. 8, the end on the right side with respect to the center line L <b> 1 of the center tooth 13 a is the center line L <b> 1. You may form so that it may extend in parallel. Even in this configuration, the split core 12 can be smoothly moved to a predetermined assembly position by linearly moving the center line L1 toward the axis O of the stator core 11.

(Circle) the space | interval of the bottom part of the adjacent slot 14 does not need to be the same as the division | segmentation core 12. FIG.
The insertion portion 15a of the distributed winding coil 15 is configured to be accommodated in the slot 14 so as to extend in the radial direction from the axis O of the stator core 11 with the outer diameter side end in contact with the bottom of the slot 14. Not limited, it may be accommodated in a state slightly inclined with respect to the radial direction.

  (Circle) each division | segmentation core which comprises the stator core 11 does not need to be formed in the same shape at least with teeth and slots. For example, the stator core 11 may be configured by a plurality of types of divided cores in which at least one of teeth and slots is formed in different shapes.

O Each tooth of the split core 12 may have a mixture of different widths in the circumferential direction at the base end.
The split core 12 is not limited to a configuration in which the tips of the teeth protrude from the inner diameter side end of the insertion portion 15a of the distributed winding coil 15 toward the axial center of the stator core 11. For example, the configuration may be such that the tip of the teeth and the inner diameter side end of the insertion portion 15 a are present on the same circumference centered on the axis of the stator core 11.

  When the divided core 12 has an even number of teeth, an odd number of slots 14 and two half slots 14a as in the third embodiment, the shape of the divided core 12 may not be symmetrical. In this case, each tooth is preferably formed symmetrically with respect to the center line of the slot 14 located in the center.

O It suffices that the coils of a plurality of phases are incorporated in the plurality of slots 14 so as to be distributed winding, and the number of phases is not limited to three, but may be two or four or more.
The distributed winding coil 15 may be any of wave winding, lap winding, and concentric winding. When the distributed winding coil 15 is assembled concentrically, after the coil is assembled to the stator core 11, a retaining member made of an insulating resin or the like is inserted into the opening of the slot 14 to prevent the insertion portion 15a from being detached from the slot 14. It is preferable to do this.

  ○ The end of the yoke portion 12a of the split cores 12, 22, 12A, 12B is not a flat surface, and a lap portion that overlaps and abuts in the axial direction when the split cores are joined is provided like the split core of Patent Document 1. May be.

  L1, L2, L3, L4 ... center line, O ... axis, 10 ... stator, 11 ... stator core, 12, 12A, 12B, 22 ... split core, 13, 13a, 13b, 23, 23a, 23b ... teeth, 14 ... slots, 15 ... distributed winding coils, 15a ... insertion parts, 16a, 17a, 17b, 26a, 27a, 27b ... side surfaces.

Claims (9)

A stator core having an annular shape and teeth and slots alternately formed in the circumferential direction along the inner circumference is composed of a plurality of divided cores divided in the circumferential direction at the bottom of the slot, and is wound around the teeth. A stator of a rotating electrical machine comprising distributed winding coils,
In the slot, the circumferential width of all the bottoms including the clearance is the same as the circumferential width of the outer diameter side end of the insertion portion to the slot of the distributed winding coil,
The split core has three or more teeth, and at least one of the teeth has one of the side surfaces in contact with the circumferential side surface of the insertion portion and between the other side surface and the circumferential side surface of the insertion portion. A stator for a rotating electrical machine, characterized in that a gap that becomes wider toward the tip of the teeth is formed, and at least one tooth has both side surfaces in contact with the circumferential side surface of the insertion portion. The slots are formed with the same spacing between the bottoms of adjacent slots,
The insertion portion is accommodated in the slot so as to extend in a radial direction from the axial center of the stator core in a state in which an outer diameter side end portion is in contact with a bottom portion of the slot,
Each divided core has at least teeth and slots formed in the same shape, and each tooth has the same circumferential width at the proximal end and the circumferential width at the distal end is narrower than the circumferential width at the proximal end. The stator of the rotary electric machine according to claim 1.   The stator of the rotating electrical machine according to claim 1 or 2, wherein a rectangular wire is used as the winding of the distributed winding coil.   The split core has an odd number of teeth, and the teeth located in the center are formed such that both side surfaces abut on the circumferential side surface of the insertion portion, and two teeth positioned between the teeth. 2. At least one of the teeth is formed in a shape in which a gap that becomes wider toward the distal end side of the tooth is formed between a side surface corresponding to the tooth positioned in the center and a circumferential side surface of the insertion portion. The stator of the rotary electric machine according to any one of claims 3 to 4.   All the teeth arranged on the outer side in the circumferential direction from the teeth positioned at the center of the divided core are teeth between the side surface corresponding to the teeth positioned at the center of the divided core and the circumferential side surface of the insertion portion. The stator of the rotating electrical machine according to claim 4, wherein the stator is formed in a shape in which a gap that becomes wider toward the tip side is generated.   The split core has three teeth, and the teeth located on both sides of the center-formed tooth formed symmetrically are teeth whose side faces corresponding to the teeth located in the center are located in the center. The stator for a rotating electrical machine according to claim 5, wherein the stator is formed so as to extend parallel to a center line of the rotating electric machine.   The stator for a rotating electrical machine according to claim 6, wherein the teeth positioned on both sides of the center positioned tooth are formed symmetrically with respect to the center line of the center positioned tooth.   The split core has an even number of teeth, and at least one of the two teeth located in the center is formed such that both side surfaces abut against a circumferential side surface of the insertion portion. Item 4. The stator for a rotating electrical machine according to any one of Items 3 to 3.   The split core has four teeth, and the two teeth positioned closer to the center are formed such that both side surfaces abut against the circumferential side surface of the insertion portion, and are positioned with the teeth interposed therebetween. The two teeth are formed so that a side surface corresponding to the tooth positioned closer to the center extends parallel to a side surface closer to the center of the two teeth positioned closer to the center. A stator for rotating electrical machines.

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