JP2008160939A - Stator core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the coil assembling performance and coil density of a stator core, and to obtain favorable torque balance when the stator core is used in a rotating electric machine. <P>SOLUTION: The stator core 1 is constituted by arranging a plurality of parallel teeth 6 and tapered teeth 7 at prescribed intervals at the internal periphery of a yoke 5. In the stator core, a slot 8 is formed between the adjacent two teeth 6, 7, and coils 3, 4 are inserted into the teeth 6, 7, respectively. The parallel teeth 6 are arranged at intervals of every two teeth, and the two tapered teeth 7 are arranged between the parallel teeth 6. Side faces 6a of the adjacent parallel teeth 6 and side faces 7a of the tapered teeth 7 are opposed to each other in parallel, and arranged in parallel with insertion directions of the oblong coil 3 and the trapezoid coil 4. The side faces 7a of the adjacent two tapered teeth 7 are opposed to each other in parallel, and arranged in parallel with the insertion direction of the trapezoid coil 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator core used for a stator of a rotating electrical machine, and more particularly to a stator core of a type that includes a plurality of teeth on an inner periphery and is assembled by inserting a coil into each tooth.

  Conventionally, as this type of stator core, for example, techniques described in Patent Documents 1 to 3 below are known. In particular, Patent Document 1 describes a stator with good assemblability in which rectangular coils whose cross-sectional outer shape is rectangular and trapezoidal coils whose cross-sectional outer shape is trapezoidal are alternately arranged in a circumferential shape inside the stator core. Has been. Specifically, a plurality of teeth (tooth groups) are formed at predetermined intervals on the inner periphery of the stator core, and rectangular coils and trapezoidal coils are alternately and regularly arranged with respect to these teeth groups, and adjacent rectangular coils. And the trapezoidal coil are formed so that the cross-sectional combination matches the slot shape between the teeth. Each tooth has a rectangular cross section and the same shape. Further, Patent Document 2 below describes that a high density coil is formed by making a tooth portion for a trapezoidal coil into a trapezoidal cross section so that the slot portion has a rectangular shape or a parallelogram shape. .

JP 2000-41365 A JP 2002-369418 A JP 2002-199640 A

  However, in the stator core described in Patent Document 1, each tooth has the same shape, and by inserting coils having different shapes into the teeth alternately, a combination of cross sections of adjacent irregularly shaped coils is formed into a slot shape. Aligned. For this reason, it is difficult to insert adjacent irregularly shaped coils alternately into the teeth while ensuring the required coil density, and the assembly of the coils to the teeth is not good. Further, in the stator core described in Patent Document 1, adjacent irregular coils are alternately arranged. However, when the stator is used in a rotating electrical machine, the number of teeth and the number of phases of the stator core and a good torque balance. No particular consideration has been given to the relationship.

  The present invention has been made in view of the above circumstances, and its purpose is to improve the assembly property and coil density of the coil, and to obtain a good torque balance when the coil is assembled and used in a rotating electrical machine. The object is to provide a stator core that is made possible.

  In order to achieve the above object, according to the first aspect of the present invention, a plurality of teeth projecting in the center direction are arranged at predetermined intervals on the inner periphery of a ring-shaped yoke, and two adjacent teeth are arranged. In the stator core in which one slot is formed and a coil is inserted into each tooth, the plurality of teeth includes a plurality of parallel teeth and a plurality of taper teeth, and the parallel teeth and the taper teeth are predetermined. It is arranged that the side surfaces of adjacent teeth that are arranged at equal intervals and face each other in parallel are opposed to each other in parallel and parallel to the insertion direction of the coil.

  According to the structure of the said invention, a coil is assembled | attached to the some teeth of the inner periphery of a yoke. By inserting a coil into each tooth, the stator is composed of the stator core and the plurality of coils. Here, a rectangular coil having a rectangular cross-sectional outer shape can be inserted into the parallel teeth of the plurality of teeth, and a trapezoidal coil having a trapezoidal cross-sectional outer shape can be inserted into the tapered teeth. And in the slot formed between two adjacent teeth, the one side of the coil inserted in two teeth is each arrange | positioned. Here, the parallel teeth and the tapered teeth are arranged at a predetermined equal number of intervals, and the side surfaces of adjacent teeth forming the slots are parallel to each other and are parallel to the coil insertion direction. Therefore, it becomes possible to insert rectangular coils or trapezoidal coils into adjacent parallel teeth or taper teeth forming a slot while their outer peripheral surfaces are parallel to the same insertion direction. In addition, the outer peripheral surface of the rectangular coil or trapezoidal coil inserted into the half of the slot and the outer peripheral surface of another rectangular coil or trapezoidal coil inserted into the remaining half of the slots should be opposed in parallel to prevent contact with each other. Is possible. Further, when a stator having a plurality of coils assembled to a stator core is used for a rotating electrical machine, the side surfaces of adjacent parallel teeth or tapered teeth forming slots of the stator core are opposed to each other in parallel. The leakage magnetic flux between them is reduced.

  In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the parallel teeth and the tapered teeth are alternately arranged, and the side surfaces and the tapered teeth of the adjacent parallel teeth forming the slot. It is intended that the side surfaces of the first and second sides face each other in parallel and parallel to the coil insertion direction.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1, in particular, the rectangular coil and the trapezoidal coil have the same outer peripheral surface respectively in the adjacent parallel teeth and the tapered teeth forming the slot. It becomes possible to insert while being parallel to the insertion direction. Further, the outer peripheral surface of the rectangular coil inserted into the half of the slot and the outer peripheral surface of the trapezoidal coil inserted into the remaining half of the slots can be opposed in parallel to prevent contact with each other. Further, when a stator having a plurality of rectangular coils and trapezoidal coils assembled to a stator core is used for a rotating electrical machine, the side surfaces of adjacent parallel teeth forming the slots of the stator core and the side surfaces of the tapered teeth are opposed to each other. Therefore, the leakage magnetic flux between the adjacent parallel teeth and the taper teeth decreases.

  In order to achieve the above object, according to a third aspect of the present invention, in the first aspect of the present invention, every two parallel teeth are arranged, and two tapered teeth are arranged between the parallel teeth. The side surfaces of the adjacent parallel teeth forming the slot and the side surfaces of the taper teeth face each other in parallel and parallel to the coil insertion direction, and the side surfaces of the two adjacent taper teeth forming the slot are parallel to each other. The purpose is to face each other and to be parallel to the coil insertion direction.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1, in particular, the rectangular coil and the trapezoidal coil have the same outer peripheral surface respectively in the adjacent parallel teeth and the tapered teeth forming the slot. It becomes possible to insert while being parallel to the insertion direction. Similarly, trapezoidal coils can be inserted into two adjacent tapered teeth forming a slot while their outer peripheral surfaces are parallel to the same insertion direction. Further, the outer peripheral surface of the rectangular coil inserted into the half of the slot and the outer peripheral surface of the trapezoidal coil inserted into the remaining half of the slots can be opposed in parallel to prevent contact with each other. Similarly, the outer peripheral surface of the trapezoidal coil inserted into the half of the slot and the outer peripheral surface of the trapezoidal coil inserted into the remaining half of the slots can be opposed in parallel to prevent contact with each other. Further, when a stator in which a plurality of rectangular coils and trapezoidal coils are assembled to a stator core is used in a rotating electrical machine, the side surfaces of adjacent parallel teeth and the side surfaces of tapered teeth that form a part of the slots of the stator core are parallel to each other. Since they face each other, the leakage magnetic flux between the adjacent parallel teeth and the tapered teeth is reduced. Similarly, since the side surfaces of two adjacent taper teeth forming the remaining slots of the stator core are opposed to each other in parallel, the leakage magnetic flux between the adjacent taper teeth is reduced.

  According to invention of Claim 1 thru | or 3, the assembly | attachment property and coil density of a coil can be improved, and when a coil is assembled | attached and used for a rotary electric machine, a favorable torque balance can be obtained.

[First Embodiment]
Hereinafter, a first embodiment in which a stator core of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a stator 2 including a stator core 1 of this embodiment. The stator 2 is used for a rotating electrical machine, and is configured by assembling two types of coils 3 and 4 to the stator core 2.

FIG. 2 is a plan view showing only the coils 3 and 4 in a section surrounded by a two-dot chain line in FIG. FIG. 3 is a plan view showing a state where the coils 3 and 4 are removed from the stator core 1 of FIG. The stator core 1 is configured by arranging a plurality of two types of teeth 6 and 7 projecting in the center direction at a predetermined interval on the inner periphery of an annular yoke 5. Slots 8 are formed between two adjacent teeth 6 and 7, respectively. The slot 8 is a space for accommodating the coils 3 and 4. The coils 3 and 4 are inserted into the teeth 6 and 7, respectively. The plurality of teeth 6 and 7 include a plurality of parallel teeth 6 and a plurality of taper teeth 7. The parallel teeth 6 have a shape in which each part protrudes with the same width toward the central direction. The two side surfaces 6a of the parallel teeth 6 are parallel to each other. The taper teeth 7 have a shape in which each portion protrudes with the width gradually reduced toward the center. Here, the angle (taper angle) θa formed by the two side surfaces 7a of the taper teeth 7 can be expressed by the following equation (1).
θa = 1.5 × 360 ° / Ts (Ts: number of stator poles) (1)
Here, the taper angle θa may have a difference of about “± 5 °” within a range in which the space factor of the coils 3 and 4 is not lowered due to the influence on the performance.

  The parallel teeth 6 and the taper teeth 7 are arranged at a predetermined equal number of intervals. In this embodiment, every two parallel teeth 6 are arranged, and two taper teeth 7 are arranged between the parallel teeth 6. The side surfaces 6a, 7a of the adjacent teeth 6, 7 forming each slot 8 are opposed to each other in parallel and parallel to the insertion direction of the coils 3, 4. Here, a rectangular coil 3 having a rectangular cross-sectional outer shape is inserted into the parallel teeth 6. The rectangular coil 3 has a structure in which the coil circumferential length does not change along the two side surfaces 6 a of the parallel teeth 6. A trapezoidal coil 4 whose cross-sectional outer shape is trapezoidal (also has a square shape) is inserted into the taper teeth 7. The trapezoidal coil 4 has a structure in which the coil circumferential length gradually decreases along the two side surfaces 7 a of the taper teeth 7. Both the coils 3 and 4 are formed by stacking copper rectangular wires in the thickness direction. Such a winding method is called “edgewise winding”. This winding method is advantageous in that the current value per copper area can be increased. Each of the coils 3 and 4 is wound around a bobbin or the like and then inserted into the teeth 6 and 7 of the stator core 1.

  Here, in the stator core 1 shown in FIGS. 2 and 3, one side surface 6 a of the adjacent parallel teeth 6 and one side surface 7 a of the tapered teeth 7 forming each slot 8 are opposed to each other in parallel with each other, and the rectangular coil 3. The trapezoidal coil 4 is parallel to each insertion direction. In addition, one side surface 7a of each of two adjacent taper teeth 7 forming another slot 8 is opposed in parallel to each other and parallel to the direction in which the trapezoidal coil 4 is inserted.

  The stator 2 shown in FIG. 1 is manufactured by inserting the rectangular coil 3 and the trapezoidal coil 4 into the teeth 6 and 7 and assembling them. Here, in the stator core 1, the trapezoidal coil 4 is inserted into all the tapered teeth 7 first, and then the rectangular coil 3 is inserted into the remaining parallel teeth 6 and assembled. By assembling the trapezoidal coil 4 first, the rectangular coil 3 can be easily inserted into the remaining space of each slot 8 without contacting the trapezoidal coil 4. Then, a rotary electric machine can be manufactured by assembling a rotor in the center hole of the stator 2.

  According to this embodiment described above, the coils 3 and 4 are respectively assembled to the plurality of teeth 6 and 7 on the inner periphery of the yoke 5 of the stator core 1. By inserting the coils 3 and 4 into the teeth 6 and 7, respectively, the stator 1 is constituted by the stator core 1 and the plurality of coils 3 and 4.

  Here, the rectangular coil 3 is inserted into the parallel teeth 6 among the plurality of teeth 6 and 7, and the trapezoidal coil 4 is inserted into the tapered teeth 7. Then, the rectangular coil 3 and the trapezoidal coil 4 can be inserted into the adjacent parallel teeth 6 and the tapered teeth 7 forming the slot 8 with their outer peripheral surfaces parallel to the same insertion direction. The outer peripheral surface of the rectangular coil 3 inserted into the half of the slot 8 and the outer peripheral surface of the trapezoidal coil 4 inserted into the remaining half of the slot 8 face each other in parallel to prevent contact with each other. Similarly, the trapezoidal coils 4 can be inserted into two adjacent tapered teeth 7 forming another slot 8 while their outer peripheral surfaces are parallel to the same insertion direction. The outer peripheral surface of the trapezoidal coil 4 inserted in the other half of the slot 8 and the outer peripheral surface of the trapezoidal coil 4 inserted in the remaining half of the slot 8 can be opposed in parallel to prevent contact with each other. Become. Here, the trapezoidal coil 4 and the rectangular coil 3 can be easily assembled to the stator core 1 by inserting the trapezoidal coil 4 into each tapered tooth 7 and then inserting the rectangular coil 3 into each parallel tooth 6. For this reason, the assemblability of the trapezoidal coil 4 and the rectangular coil 3 can be improved as the stator core 1. A part of the plurality of slots 8 is occupied by the trapezoidal coil 4 and the rectangular coil 3, and the remaining slot 8 is occupied by the two trapezoidal coils 4 to minimize the gap between the two coils 3 and 4. Can be. For this reason, as the stator 2, a coil density can be improved and a coil space factor can be improved.

  Further, when the stator 2 configured as described above is used in a rotating electrical machine, the side surface 6a of the adjacent parallel teeth 6 and the side surface 7a of the tapered teeth 7 that form a part of the slots 8 of the stator core 1 are parallel to each other. Since they face each other, the leakage magnetic flux between the adjacent parallel teeth 6 and the taper teeth 7 is reduced. Similarly, since the side surfaces of two adjacent taper teeth 7 forming the remaining slot 8 of the stator core 1 face each other in parallel, the leakage magnetic flux between the adjacent taper teeth 7 is reduced. That is, the leakage magnetic flux between the teeth 6 and 7 is reduced. For this reason, a favorable torque balance can be obtained as a rotating electrical machine.

  In this embodiment, since every two parallel teeth 6 are arranged, and two taper teeth 7 are arranged between the parallel teeth 6, it is adopted for a rotating electrical machine in which the number of stator poles is a multiple of three. Can do. That is, the stator core 1 and the stator 2 of the present embodiment can be employed in a rotating electrical machine having 9 poles or 15 poles.

  Here, the suitable number of phases will be examined for the rotating electrical machine that employs the stator 2 constituted by the stator core 1 of this embodiment. In the stator core 1 of this embodiment, the number of teeth 6 and 7 is a multiple of 3 because of its configuration. For example, as shown in the excitation image of the three-phase rotating electrical machine 11 in FIG. When the rotary electric machine 11 is composed of the three phases C and C, there is a slight difference in the generated torque between the phases A, B, and C. Therefore, by setting the number of phases of the rotating electrical machine to an even number such as 2 phases or 4 phases, for example, as shown in the excitation image of the single-phase rotating electrical machine 12 in FIG. 12, the same number of teeth having different shapes included in one phase is included. For this reason, when the excitation phase is an even number, the unbalance between the A phase and the B phase having different tooth shapes can be canceled. FIGS. 6 and 7 are time charts showing differences in torque generation images. In the case of the three-phase rotating electrical machine 11, as shown in FIG. 6, the total torque of the A-phase torque, the B-phase torque and the C-phase torque varies, but in the case of the single-phase rotating electrical machine 12, FIG. As shown in FIG. 5, the fluctuation of the total torque of the A phase torque and the B phase torque can be eliminated. As can be seen from FIG. 7, in the stator core 2 of this embodiment, the torque balance between the respective phases can be improved by setting the number of phases of the rotating electrical machine to an even number such as two phases or four phases.

  Next, a suitable number of poles per phase will be examined for a rotating electrical machine that employs a stator 2 composed of the stator core 1 of this embodiment. Here, a case will be described in which the number of phases is an even number such as two phases or four phases in consideration of the number of phases described above. In the stator core 1 of this embodiment, since the shapes of the teeth 6 and 7 included in one phase are different due to the configuration, for example, as shown in the one-phase excitation image in FIG. In particular, a force other than the force (torque) in the circumferential direction, that is, the eccentric force D1 is generated due to the difference in generation of the stresses S1, S2, and S3 on the rotor 14. Therefore, by setting the number of poles (the number of teeth) of one phase of the rotating electrical machine to a number of 6 or more, for example, as shown by a one-phase excitation image in FIG. A pair of identically arranged poles can be arranged at equal angular intervals of 60 °, and the stresses S1, S2, and S3 can be canceled between the pair of poles. For this reason, generation | occurrence | production of the eccentric force in the rotor 14 can be suppressed. In other words, in the rotating electrical machine 15, the generated magnetic force per phase is balanced in the circumferential direction, and the eccentric force other than the rotating direction can be canceled.

[Second Embodiment]
Next, a second embodiment in which the stator core of the present invention is embodied will be described in detail with reference to the drawings.

  In each embodiment described below (including this embodiment), the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Hereinafter, different points are mainly described. explain.

FIG. 10 is a perspective view showing a stator 22 including the stator core 21 of this embodiment. FIG. 11 is a plan view of a portion surrounded by a two-dot chain line in FIG. FIG. 12 is a plan view showing a state where the coils 3 and 4 are removed from the stator core 1 of FIG. The stator core 21 of this embodiment is different from the first embodiment in the arrangement of the parallel teeth 6 and the taper teeth 7. That is, in this embodiment, the parallel teeth 6 and the taper teeth 7 are alternately arranged, and one side surface 6a of the adjacent parallel teeth 6 and the one side surface 7a of the adjacent parallel teeth 6 forming the slot 8 are opposed to each other in parallel. In addition, it is parallel to the insertion direction of the rectangular coil 3 and the trapezoidal coil 4. Here, the taper angle θa formed by the two side surfaces 7a of the taper teeth 7 can be expressed by the following equation (2).
θa = 2 × 360 ° / Ts (Ts: number of stator poles) (2)
Here, the taper angle θa may have a difference of about “± 5 °” within a range in which the space factor of the coils 3 and 4 is not lowered due to the influence on the performance.

  The stator 22 shown in FIG. 10 is manufactured by inserting the rectangular coil 3 and the trapezoidal coil 4 into the teeth 6 and 7 and assembling them. Also in the stator core 21 of this embodiment, as in the first embodiment, the trapezoidal coil 4 is inserted into all the tapered teeth 7 first, and then the rectangular coil 3 is inserted into the remaining parallel teeth 6 and assembled. Yes. Thereby, after the trapezoidal coil 4 is inserted into the slot 8, the rectangular coil 3 can be easily inserted without contacting the trapezoidal coil 4. A rotary electric machine can be manufactured by assembling a rotor in the center hole of the stator 22.

  According to this embodiment described above, the rectangular coil 3 is inserted into the parallel teeth 6 among the plurality of teeth 6 and 7, and the trapezoidal coil 4 is inserted into the tapered teeth 7. Then, the rectangular coil 3 and the trapezoidal coil 4 can be inserted into the adjacent parallel teeth 6 and the tapered teeth 7 forming the slot 8 with their outer peripheral surfaces parallel to the same insertion direction. Further, the outer peripheral surface of the rectangular coil 3 inserted into the half of the slot 8 and the outer peripheral surface of the trapezoidal coil 4 inserted into the remaining half of the slot 8 can be opposed in parallel to prevent contact with each other. Become. Here, the trapezoidal coil 4 and the rectangular coil 3 can be easily assembled to the stator core 21 by inserting the trapezoidal coil 4 into each taper tooth 7 and then inserting the rectangular coil 3 into each parallel tooth 6. For this reason, the assemblability of the trapezoidal coil 4 and the rectangular coil 3 can be improved as the stator core 21. Further, each slot 8 is occupied by the irregular trapezoidal coil 4 and the rectangular coil 3, and the gap between the two coils 3 and 4 can be minimized. For this reason, as the stator 22, a coil density can be improved and a coil space factor can be improved.

  Further, when the stator 22 configured as described above is used in a rotating electrical machine, the side surface 6a of the adjacent parallel teeth 6 and the side surface 7a of the tapered teeth 7 forming the slot 8 of the stator core 21 are opposed to each other in parallel. Therefore, the leakage magnetic flux between the adjacent parallel teeth 6 and the taper teeth 7 decreases. That is, the leakage magnetic flux between the teeth 6 and 7 is reduced. For this reason, a favorable torque balance can be obtained as a rotating electrical machine.

  Here, a suitable number of phases will be examined for the rotating electrical machine that employs the stator 22 composed of the stator core 21 of this embodiment. In the stator core 21 of this embodiment, the number of teeth 6 and 7 is an even number because of its configuration. For example, as shown in the excitation image of the even-phase (two-phase) rotating electrical machine 31 in FIG. When used in a rotating electrical machine 31 composed of two phases of B phase, a slight difference in generated torque occurs between the phases A and B. Therefore, by setting the number of phases of the rotating electrical machine to an odd number such as 3 phases, for example, as shown in the excitation image of the odd-phase (3-phase) rotating electrical machine 32 in FIG. In the rotating electrical machine 32 composed of the same, the same number of teeth having different shapes included in one phase are included. For this reason, when the excitation phase is an odd number, it is possible to cancel the imbalance among the A phase, the B phase, and the C phase having different tooth shapes. 15 and 16 are time charts showing the difference in torque generation image. In the case of the two-phase rotating electrical machine 31, as shown in FIG. 15, the total torque of the A-phase torque and the B-phase torque varies, but in the case of the three-phase rotating electrical machine 32, as shown in FIG. , Fluctuations in the total torque of the A phase torque, the B phase torque and the C phase torque can be eliminated. As can be seen from FIG. 16, in the stator core 21 of this embodiment, the torque balance between the respective phases can be improved by setting the number of phases of the rotating electrical machine to an odd number such as three phases.

  Next, a suitable number of poles per phase will be examined for a rotating electrical machine that employs a stator 22 composed of the stator core 21 of this embodiment. Here, a case where the number of phases is an odd number such as three phases in consideration of the number of phases described above will be described. In the stator core 21 of this embodiment, since the shapes of the teeth 6 and 7 included in one phase are different due to the configuration, for example, as shown in the one-phase excitation image in FIG. In particular, a force other than the circumferential force (torque), that is, the eccentric force D1 is generated due to the difference in the generation of the stresses S1 and S2 with respect to the rotor 34. Therefore, by setting the number of poles (the number of teeth) of one phase of the rotating electrical machine to a number of 4 or more, for example, as shown by the one-phase excitation image in FIG. A pair of identical poles arranged in the same manner can be arranged at equal angular intervals of 90 °, and the stresses S1 and S2 can be canceled between the pair of poles. For this reason, generation | occurrence | production of the eccentric force in the rotor 34 can be suppressed. In other words, in the rotating electrical machine 35, the generated magnetic force per phase is balanced in the circumferential direction, and the eccentric force other than the rotating direction can be canceled.

[Third Embodiment]
Next, a third embodiment in which the stator core of the present invention is embodied will be described in detail with reference to the drawings.

  The stator core 21 of this embodiment is the same as that of the second embodiment. This embodiment differs from the second embodiment in the configuration of the rectangular coil 23 and the trapezoidal coil 24. FIG. 19 is a plan view showing a part of the stator including the stator core 21 of this embodiment, with only the coils 23 and 24 shown in cross section. In this embodiment, the rectangular coil 23 and the trapezoidal coil 24 are formed by multi-stage winding of square wires. Each of the coils 23 and 24 is formed by being wound around a bobbin or the like and then inserted into the parallel teeth 6 and the taper teeth 7 of the stator core 21. Accordingly, since the coils 23 and 24 are formed of square wires, the force required for winding can be reduced compared to the coils 3 and 4 described above which are formed of flat wires, and coil forming is relatively easy. Can be a thing. In addition, this embodiment can provide the same operational effects as those of the second embodiment.

[Fourth Embodiment]
Next, a fourth embodiment in which the stator core of the present invention is embodied will be described in detail with reference to the drawings.

  The stator core 21 in this embodiment is the same as that of the second embodiment. This embodiment differs from the second embodiment in the configuration of the rectangular coil 25 and the trapezoidal coil 26. FIG. 20 is a plan view showing a part of the stator including the stator core 21 of this embodiment, in which only the coils 25 and 26 are shown in cross section. That is, in this embodiment, both the coils 25 and 26 are configured by multi-stage winding of round wires. Each of the coils 25 and 26 is inserted into the parallel teeth 6 and the taper teeth 7 of the stator core 21 after being formed by being wound around a bobbin or the like. Therefore, since the coils 25 and 26 are both made of a round wire, the force required for winding can be reduced and the coil can be formed relatively easily as compared with the coils 3 and 4 which are made of a flat wire. Can be a thing. In addition, this embodiment can provide the same operational effects as those of the second embodiment.

[Fifth Embodiment]
Next, a fifth embodiment embodying the stator core of the present invention will be described in detail with reference to the drawings.

  This embodiment is different from the third embodiment in terms of the shape of the tapered teeth 7 and the accessory parts of the parallel teeth 6. FIG. 21 is a plan view showing a part of the stator including the stator core 27 of this embodiment, with only the coils 23 and 24 shown in cross section. This embodiment is characterized in that a straight portion 7b having no inclination is integrally formed at the tip of the taper tooth 7. Thereby, the area of the front end surface 7c of the taper teeth 7 can be enlarged as compared with the taper teeth without the straight section 7b, and the facing area between the front end surface 7c and the rotor can be increased. As a result, the output torque of the rotating electrical machine can be increased by an increase in the facing area, and the generated voltage can be increased.

  In addition, this embodiment is characterized in that the insulating component 28 is sandwiched between the tips of the parallel teeth 6. The insulating component 28 has a cross-sectional channel shape (a U-shape), and can be mounted by inserting the open end portion thereof from above the parallel teeth 6 into the slots 8 located on both sides of the teeth 6. In FIG. 21, the insulating member 28 is attached to only one parallel tooth 6, but the insulating member 28 is also attached to the other parallel teeth 6. By assembling the insulating member 28, it is possible to prevent the coils 23 and 24 from falling off from the teeth 6 and 7. Moreover, the heat dissipation of each coil 23 and 24 can be improved by using the insulating component 28 as a substance with good thermal conductivity.

  The present invention is not limited to the above-described embodiments, and can be implemented as follows without departing from the spirit of the invention.

  (1) In the said 3rd Embodiment, although the modification of the coils 3 and 4 used for the stator core 21 of 2nd Embodiment was demonstrated, the coil used for the stator core 1 of 1st Embodiment with the same meaning. You may comprise 3 and 4 by the multistage winding of a square wire.

  (2) In the fourth embodiment, the modification examples of the coils 3 and 4 used for the stator core 21 of the second embodiment have been described. However, for the same purpose, the coils used for the stator core 1 of the first embodiment. You may comprise 3 and 4 by the multistage winding of a round wire.

  (3) In the said 5th Embodiment, although the modification of the stator core 21 of 2nd Embodiment was demonstrated, it can materialize also in the stator core 1 of 1st Embodiment with the same meaning.

  (4) In the first embodiment, two parallel teeth 6 are arranged every two, and two taper teeth 7 are arranged between the parallel teeth 6. However, every three or four parallel teeth are arranged. It is possible to arrange three or four taper teeth between the parallel teeth. The number of taper teeth between two parallel teeth may be 5 or more as required.

The perspective view which shows the stator containing a stator core. FIG. 2 is a plan view showing a part surrounded by a two-dot chain line in FIG. The top view which shows a part of stator core. Explanatory drawing which shows the excitation image of a three-phase rotary electric machine. Explanatory drawing which shows the excitation image of a single phase rotary electric machine. The time chart which shows the difference in the generation image of torque. The time chart which shows the difference in the generation image of torque. Explanatory drawing which shows the excitation image of 1 phase. Explanatory drawing which shows the excitation image of 1 phase. The perspective view which shows the stator containing a stator core. FIG. 11 is a plan view showing a part surrounded by a two-dot chain line in FIG. The top view which shows a part of stator core. Explanatory drawing which shows the excitation image of an even phase (2 phase) rotary electric machine. Explanatory drawing which shows the excitation image of an odd phase (3 phase) rotary electric machine. The time chart which shows the difference in the generation image of torque. The time chart which shows the difference in the generation image of torque. Explanatory drawing which shows the excitation image of 1 phase. Explanatory drawing which shows the excitation image of 1 phase. FIG. 3 is a plan view showing a part of the stator with only a coil shown in cross section. FIG. 3 is a plan view showing a part of the stator with only a coil shown in cross section. FIG. 3 is a plan view showing a part of the stator with only a coil shown in cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 3 Rectangular coil 4 Trapezoid coil 5 Yoke 6 Parallel teeth 6a Side surface 7 Tapered teeth 7a Side surface 8 Slot 21 Stator core 23 Rectangular coil 24 Trapezoid coil 25 Rectangular coil 26 Trapezoid coil 27 Stator core

Claims (3)

A plurality of teeth projecting in the center direction are arranged at predetermined intervals on the inner circumference of the annular yoke, and one slot is formed between two adjacent teeth, and a coil is inserted into each of the teeth. In the stator core that is supposed to be
The plurality of teeth includes a plurality of parallel teeth and a plurality of taper teeth, and the parallel teeth and the taper teeth are arranged at a predetermined equal number interval, and side surfaces of adjacent teeth forming the slot are parallel to each other. And a stator core that is parallel to the insertion direction of the coil. The parallel teeth and the taper teeth are alternately disposed, and the side surfaces of the adjacent parallel teeth and the side surfaces of the taper teeth forming the slot are opposed to each other in parallel and parallel to the insertion direction of the coil. The stator core according to claim 1. The parallel teeth are arranged at intervals of two, and two taper teeth are arranged between the parallel teeth, and the side surfaces of the adjacent parallel teeth forming the slot and the side surfaces of the taper teeth are parallel to each other. The side surfaces of the two adjacent taper teeth forming the slot are parallel to each other and parallel to the insertion direction of the coil. The stator core according to claim 1.

Images