JP2019097309A - Rotary electric machine and stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the density of windings. A rotating electric machine includes a stator and a rotatable rotor inside the stator, the stator having a cylindrical core having teeth, and a bobbin formed around the core. A plurality of concentrated winding coils in which the coils are concentratedly wound around the teeth of the iron core via a bobbin, and at least one of the concentrated winding coils starts from the back yoke side of the iron core on the first layer in contact with the teeth. In addition, a forward winding part that is wound while moving to the inner peripheral side with at least one position being a gap, and a reverse winding part that is wound into the gap while moving from the inner peripheral side to the back yoke side. [Selection diagram] Fig. 9

Description

  The present invention relates to a rotating electrical machine and a stator.

  There is a need for the development of technology to reduce CO2 emissions in order to suppress global warming. For this reason, there is great expectation for the motorization of the motor vehicle to realize this and the higher output and higher efficiency of the motor and generator which are the drive sources. Patent Document 1 includes a housing that houses the whole, a rotor rotatably mounted on the housing via a rotation shaft, and a stator mounted on the housing so as to face the outer periphery of the rotor. The stator is fixed to the housing and has an annular stator core formed with teeth forming a plurality of slots, and a plurality of coils wound around the teeth through a bobbin made of a resin insulating material. A stator coil, the first layer being wound sequentially from the outer diameter side to the inner diameter side of the stator around the first layer, and the winding direction is reversed for each layer and wound; The outermost layer is n (where n is an odd number of 3 or more), the final turn of each layer is m (where m is 2 or more), the first turn of the first layer is (1, 1), the second layer is the second Turn number (1, 2) When the first turn of the second layer is (2, 1) and the second turn of the second layer is (2, 2)... The m turn of the nth layer is (n, m), the nth layer The mth turn (n, m) is wound on the outer diameter side of the stator, and the stator coil on the inner diameter side is lane-changed by the short side teeth portion, and the stator coil on the outer diameter side A rotating electrical machine is disclosed, which is characterized in that a part of the vehicle is changed by lane change at the long side teeth portion.

International Publication No. 2017/072912

  In the invention described in Patent Document 1, the densification of the winding is not sufficient.

A rotating electrical machine according to a first aspect of the present invention is a rotating electrical machine comprising a stator and a rotatable rotor inside the stator, the stator being cylindrical and having an iron core with teeth. A bobbin formed around the iron core; and a plurality of concentrated winding coils in which a coil is intensively wound around teeth of the iron core via the bobbin, at least one of the concentrated winding coils being In the first layer in contact with the teeth, a forward winding portion wound starting from the back periphery side of the iron core while moving to the inner periphery side with the back yoke side as the start point and at least one place as an air gap; And a reverse winding section which is wound around the gap while moving to the side.
A stator according to a second aspect of the present invention is an iron core having a cylindrical shape and teeth, a bobbin formed around the iron core, and a coil concentratedly wound on the iron core teeth via the bobbin. And a plurality of concentrated winding coils, wherein at least one of the concentrated winding coils is a first layer in contact with the teeth, starting from the back yoke side of the iron core and having at least one void as an inner circumferential side And a reverse winding portion wound around the gap while moving from the inner circumferential side to the back yoke side.

  According to the present invention, the windings can be densified.

A diagram showing the internal structure of the rotary electric machine 1 External view of stator 3 External view of block 15 A diagram showing the appearance of the split core block 12 External view of bobbin 13 The figure which shows the state which attached the bobbin 13 to the split core block 12 A diagram schematically showing the relationship between the number of rotor poles and the shape of block 15. Diagram showing the width of the block 15 allowed The figure explaining the procedure of the winding in a 1st embodiment Diagram showing a block 15 Z wound according to the prior art Diagram showing a block 15 Z wound according to the prior art The figure which shows the procedure of the winding in case several air gaps are formed in one block 15 in the modification 3. A diagram showing a bobbin 13A in a second embodiment The figure which shows the state which wound the coil 8 around the bobbin 13A The figure which shows the bobbin 13B concerning 3rd Embodiment.

-First embodiment-
Hereinafter, with reference to FIGS. 1 to 11, a first embodiment of a rotating electrical machine and a stator according to the present invention will be described. The coil is formed, for example, using an enameled wire, and the "coil" and the "wire" are strictly different. However, in the present embodiment, the “electric wire” is also referred to as a “coil” except when the physical shape is described.

(Internal structure of rotating electrical machine 1)
FIG. 1 is a view showing an internal structure of a rotary electric machine 1 according to the present invention. The stator 3 is fixed to the inner periphery of the housing 2 by shrink fitting or press fitting. A SPM (Surface Permanent Magnet) type rotor core having permanent magnets 4 affixed to the outer periphery is inserted into the inner periphery of the stator 3 and the shaft 5 integrated coaxially with the rotor core is supported by the bearing 6 doing. When voltages with different phases are applied to each of the input terminals 7, current flows through the coils 8 in the stator 3 electrically connected to the input terminals 7, electrical energy is converted to mechanical energy, and the shaft 5 rotates. Instead of the SPM type rotor core, an IPM (Interior Permanent Magnet) type rotor core may be used in which the permanent magnet 4 is inserted into an insertion groove provided in the axial direction of the core.

  If the conductor cross-sectional area of the coil 8 incorporated in the stator 3 is large and the circumferential length can be shortened, the efficiency of the rotating electrical machine is improved by the reduction of the electrical resistance. For this reason, by rotating the coil 8 concentratedly around each tooth 10 of the stator core 9, the rotary electric machine 1 has a magnetically invalid coil length projected from both axial end faces of the stator core 9, ie, We adopt "Concentrated winding" which can shorten the coil end. Further, as means for improving the alignment of the coil 8 to be wound and winding more conductors on the stator core 9, the rotary electric machine 1 adopts a "divided core" for dividing the stator core 9. The cross section of the coil 8 may be a circle or a substantially rectangular parallelepiped. In other words, the coil 8 may be a so-called round wire or a so-called square wire.

  FIG. 2 is an external view of the stator 3. As shown in FIG. 2, the stator 3 is composed of a plurality of blocks 15. The structure and manufacturing method of the block 15 will be described below.

(Structure of block 15)
FIG. 3 is an external view of the block 15. However, FIG. 3 shows three blocks 15 connected via the connecting wire 8A which is the coil 8. The block 15 is provided with a split core block 12 which is an iron core, a bobbin 13 and a coil 8. The coil 8 is wound around the split core block 12 via the bobbin 13 as described later to form a concentrated winding coil 8B. A groove 18 shown in FIG. 3 fixes a winding start 16 described later. The split core block 12 is created as follows.

  FIG. 4 is a view showing the appearance of the split core block 12. A split core block 12 is formed by punching a magnetic steel sheet having a thickness of 0.15 mm to 0.5 mm and laminating and fixing the laminated steel sheet by caulking or adhesion (not shown). The split core block 12 includes teeth 10 on which the coil 8 is wound via the bobbin 13 and a back yoke 11.

  FIG. 5 is an external view of the bobbin 13. The bobbin 13 is injection molded of a resin such as PBT (polybutylene terephthalate) or PPS (polyphenylene sulfide). A protrusion 14 is provided on the side surface of the bobbin 13 to prevent the positional displacement of the coil 8. However, the protrusion 14 is not an essential component, and the bobbin 13 may not include the protrusion 14. The bobbin 13 is separable at the center in the vertical direction of FIG. As indicated by a symbol w in FIG. 5, the width of the region of the bobbin 13 in which the coil 8 is wound is referred to as the bobbin width. In the present embodiment, the bobbin width is constant. Further, the vertical direction indicated by reference symbol H in FIG. 5 is referred to as the height direction of the bobbin 13.

  FIG. 6 is a view showing a state in which the bobbin 13 is assembled to the split core block 12. The bobbin 13 is separated into two, and assembled so as to sandwich the split core block 12 shown in FIG. 4 from above and below. After that, when the coil 8 is wound around the bobbin 13 with an electric wire with an enameled film, a block 15 is formed. The procedure of winding will be described later.

(Issues with multi-polarization)
In recent years, in order to improve the efficiency of the rotating electrical machine and further improve the output torque, multipolarizing of the rotor has been promoted. The explanation will be given by using the formula together. The output torque T of the rotating electrical machine is expressed by the following equation 1.
T = Kt · I ... (Equation 1)

Where Kt is a torque constant and I is a current. Further, the torque constant Kt has a relationship shown by the following equation 2.
Kt = α · f · n · φ (Equation 2)

Is a constant, f is a frequency, n is the number of coil turns, and φ is a magnetic flux. Further, the torque T has a relationship shown in the following equation 3.
T = α · f · n · φ · I (Equation 3)

  Even if the number of rotations of the rotor is constant, if the number of poles of the rotor is increased, the frequency f increases. Therefore, it is necessary to reduce the number of turns n of the coil to obtain a constant torque T as is apparent from equation (3). Can. As the number of turns of the coil decreases, the following two effects can be obtained. The first is the effect of improving the efficiency by reducing the coil resistance. The second effect is an effect of disposing a coil with a reduced volume on the outer peripheral side of the stator, increasing the rotor diameter and increasing the torque.

  Since these effects can be obtained by increasing the number of poles of the rotor, the rotary electric machine 1 according to the present invention is designed to increase the number of poles of the rotor. However, in response to the increase in the number of poles of the rotor, the number of magnetic poles of the stator 3, that is, the number of divided core blocks 12 is increased, and the restriction on the shape of each divided core block 12 is increased. This will be specifically described with reference to the drawings.

  FIG. 7 schematically shows the relationship between the number of poles of the rotor and the shape of the block 15. As shown in FIG. FIG. 7 (a) is a diagram showing a case where twelve blocks 15 are provided, and FIG. 7 (b) is a diagram showing a case where fourteen blocks 15 are provided. When the number of poles of the rotor is relatively small 8 or 10, as shown in FIG. 7A, 12 blocks 15 are often used, and the number of poles of the rotor is relatively large 14 As shown in 7 (b), 14 blocks 15 are often used.

  As apparent from the comparison between FIG. 7 (a) and FIG. 7 (b), as the number of poles of the rotor increases, the width of the allowed block 15 becomes narrower. As described above, the block 15 includes the split core block 12, the bobbin 13 and the coil 8, and the split core block 12 is formed by laminating the steel plates, and the bobbin 13 is formed by injection molding. It is. However, since the coil 8 is wound around the bobbin 13, it is necessary to devise the narrowing of the allowed width of the block 15. This will be specifically described with reference to the drawings.

  FIG. 8 is a diagram showing the width of the block 15 permitted. Since the blocks 15 constitute the stator 3 by being arranged side by side on the circumference, each block 15 is required to have a width not in contact with the adjacent block 15. Specifically, the coil 8 wound around the bobbin 13 of the block 15 is required to be contained in a substantially trapezoidal area indicated by reference numeral 900 in FIG. If the coil 8 does not fit in the trapezoidal region 900 as shown on the left side of the figure, the stator 15 can not be formed by combining the blocks 15 because they interfere with the coils 8 of the adjacent blocks 15.

  Therefore, in the present embodiment, as shown on the right side of FIG. 8, a device is adopted in which the winding start 16 to the winding end 17 of the coil 8 are contained in the trapezoidal region 900. If the number of turns of the coil 8 in the adjacent blocks 15 is different, it is possible to set the space formed by reducing the number of turns of the coils 8 in the adjacent block 15 as the arrangement space of the opposing coil 8. Then, the number of turns of all the coils 8 is the same.

  In the present embodiment, among the coils 8 wound around the bobbin 13, the innermost coil 8 in contact with the bobbin 13 is referred to as the first layer L1, and the coil wound around the first layer L1 is used. The coil wound on the outer side of the second layer L2 and the second layer L2 is referred to as a third layer L3. For example, the coil 8 is present up to the third layer on the left side of FIG. 8, and the coil 8 is present up to the second layer on the right side of FIG. In the present embodiment, as shown on the left side of FIG. 8, the upper side of FIG. 8 is called the back yoke side or the outer peripheral side, and the lower side of FIG. 8 is called the inner peripheral side. Hereinafter, a region which is formed on the bobbin 13 and which can be wound is referred to as a winding possible region 131.

(Winding procedure)
FIG. 9 is a view for explaining the procedure of winding in the first embodiment. The states shown in FIGS. 9A to 9D are referred to as first to fourth stages for convenience, respectively. The winding described below may be executed by a machine such as a winding machine based on a previously created program, or may be executed by a human. In the following, the procedure will be described on the assumption that the winding machine performs winding.

  FIG. 9 is a view of the block 15 as viewed from above the coil end 19 on the winding start 16 side of the coil 8, that is, from the upper side in FIG. Further, in FIG. 9, the number of turns of the coil 8 is indicated by “T”.

  First, as shown in FIG. 9A, the winding machine winds off the winding start 16 of the coil 8 in the groove 18 and winds the first turn on the bobbin 13 at a position closest to the back yoke 11 in the winding possible region 131 . That is, in the first stage shown in FIG. 9A, the coil end 19 is formed on the back side of the drawing, but the coil end 19 is not formed on the front side of the drawing.

  Next, as shown in FIG. 9 (b), in order to form a second turn on the inner circumferential side, the winding machine forms a plurality of transition portions 22 of the first turn and the second turn at two winding pitches. . As a result, an air gap 23 in which only one electric wire forming the coil 8 is formed is formed on the side surface 20 of the coil next to the first turn which is the winding start 16. Then, the winding machine winds the coil 8 while forming the transition portion 19A normally without forming the air gap 23 until it reaches the innermost circumference side of the winding possible region 131 after winding the second turn around the bobbin 13 thereafter. It winds and it becomes the 2nd step shown in Drawing 9 (b).

  The coil end 19 also includes a normal transition portion 19A and a plurality of transition portions 22. In the following, the coil 8 wound around while forming at least one air gap 23 starting from the back yoke side and moving to the innermost circumferential side will be referred to as a forward winding portion 910. That is, the coil 8 of the first turn to the fourth turn is the forward winding portion 910.

  Next, as shown in FIG. 9C, the winding machine forms the reverse transition portion 24 and forms the fifth turn of the coil 8 in the air gap 23 sandwiched by the coil 8 of the first turn and the second turn. It is the third stage. The reverse transition portion 24 travels from the inner circumferential side to the back yoke side so as to jump over the coil 8 of the second to fourth turns. The coil 8 of the fifth turn has the coils 8 of the first turn and the second turn on both sides, so the coil 25 of the fifth turn inserted in the air gap 23 is fixed inside the air gap 23 by friction. Therefore, the coil 25 of the fifth turn is not pulled out of the air gap 23 by the tension at the time of winding. Hereinafter, the coil 8 wound in the air gap 23 while shifting from the inner circumferential side of the winding possible region 131 to the back yoke side is referred to as a reverse winding portion 920. In the present embodiment, the coil 8 of the fifth turn is the reverse winding portion 920.

  Finally, the winding machine winds the coil 26 of the sixth turn in the second layer so as to be in contact with the coil 25 of the fifth turn wound in the air gap 23 as shown in FIG. As a result, the fifth turn coil 25 can be pressed from the upper layer, and the fifth turn coil 25 can be firmly prevented from dropping out of the air gap 23 after the winding. According to the above configuration, the winding start 16 and the winding end 17 are provided on the back yoke 11 side, and the trapezoidal space in the slot is effectively utilized without generating an electric wire which is disposed to be obliquely disposed on the side surface 20 of the coil. Can be wound at a high density.

(Conventional method)
10 and 11 show a block 15Z wound according to the prior art. This will be described for comparison with the block 15 in the present embodiment. The blocks 15 and 15Z are identical except for the winding.

  First, as shown in FIG. 10 (a), the winding machine starts winding the coil 8 from the most back yoke side of the winding area 131, and winds on three surfaces of the bobbin 13 excluding the coil end 19 on the winding start side. Form the first turn. Up to this point, the procedure of the present invention is the same. After that, as shown in FIG. 10 (b), the winding machine forms the normal transition portion 19A without leaving a gap until it reaches the innermost side of the possible winding area 131, and moves to the inner side. While winding the coil 8 around the bobbin 13.

  Although the problem does not occur up to this point, as shown in FIG. 10C, since the side surface of the coil 8 of the sixth turn is not positioned in the valley formed by the first turn and the second turn, the following problem occurs. That is, although the conventional reverse transition portion 24Z transitioning from the fifth turn to the sixth turn is along the outer periphery of the plurality of normal transition portions 19A, the conventional reverse transition portion 24Z is caused by the tension when winding the coil 8 of the sixth turn. As shown by reference numeral 21 in FIGS. 10 and 11, the coil 8 is obliquely disposed so as to connect the two surfaces of the coil end 19 and the coil side surface 20 at the shortest distance.

  Therefore, according to the conventional method, since the coil 8 of the sixth turn protrudes largely from the above-mentioned trapezoidal region 900, interference with the adjacent coil occurs, and the winding of the ideal number of turns becomes impossible. When the number of poles of the rotating electrical machine having a concentrated winding stator is increased to improve torque and efficiency, the teeth and the trapezoidal space allocated to the windings become elongated, so the winding start 16 and the winding end 17 are back yoked 11 This problem becomes even more pronounced if you try to make the windings denser on the side. Although the problems of the prior art have been described using the stators of the split cores, the same problems also occur when a cylindrical integral core is used.

According to the first embodiment described above, the following effects can be obtained.
(1) The rotating electrical machine 1 includes the stator 3 and a rotatable rotor inside the stator 3. The stator 3 is a cylindrical core core 12 having teeth 10, a coil 13 concentrated on the teeth 10 through the bobbin 13 formed around the core block 12, the bobbin 13 formed around the core block 12. And a plurality of wound concentrated winding coils 8B. At least one of the concentrated winding coils 8B is the first layer in contact with the teeth 10 via the bobbin 13, and the back yoke side of the split core block 12 is the starting point and at least one place is the air gap 23 and is the innermost side A forward winding portion 910 is wound while being transitioned, and a reverse winding portion 920 is wound around the air gap 23 while shifting from the inner circumferential side to the back yoke side. Therefore, the trapezoidal space in the slot can be effectively used to wind the coil 8 at a high density.

(2) The air gap 23 is adjacent to the winding start 16 of the coil 8. Therefore, the winding start 16 and the winding end 17 are provided on the back yoke side, and the continuous winding and its winding are easy.

(3) The concentrated winding coil 8B is in contact with the coil 8 wound in the air gap 23, and the coil 8 is further wound on the upper layer. Therefore, the coil 8 wound in the air gap 23 can be pressed from the upper layer, and the coil 8 can be firmly prevented from dropping out of the air gap 23 after the winding.

(4) The rotary electric machine 1 includes at least two concentrated winding coils 8B continuously wound via the connecting wires 8A as shown in FIG. Therefore, an ideal winding can be obtained in the plurality of blocks 15 included in the rotary electric machine 1, and the performance of the rotary electric machine 1 can be improved.

(Modification 1)
The coil 8 wound in the second layer may not be present. That is, the coil 8 of the sixth turn in FIG. 9 may not be present.

(Modification 2)
The air gap 23 formed in the first layer is not limited to the place described in the first embodiment. For example, the air gap 23 may be provided after two turns are sequentially wound from the outermost periphery of the winding possible region 131, or the air gap 23 may be provided after three turns or more.

(Modification 3)
In the first embodiment described above, only one air gap 23 is formed in one block 15. However, a plurality of air gaps 23 may be formed in one block 15.

  FIG. 12 is a view showing a procedure of winding in the case where a plurality of air gaps 23 are formed in one block 15. The state shown in each of FIGS. 12 (a) to 12 (f) is referred to as stage A1 to stage A6 for convenience. The differences from the procedure described with reference to FIG. 9 in the first embodiment will be mainly described below. Also in this modification, the winding machine will be described on the assumption that the winding machine performs winding for convenience.

  Step A1 shown in FIG. 12A is the same as the first step in the first embodiment. Next, as shown in FIG. 12 (b), the winding machine has two turns 22 of the first turn and the second turn to form a second turn on the inner peripheral side of the first turn. Form with line pitch. As a result, a first air gap 23A into which only one electric wire forming the coil 8 is formed is formed on the side surface 20 of the coil next to the first turn which is the winding start 16. And a winding machine winds the 2nd turn around bobbin 13, and it becomes A2 stage.

  Next, as shown in FIG. 12C, in order to form a third turn on the inner circumferential side, the winding machine forms a plurality of transition portions 22 of the second turn and the third turn at a two-winding pitch. . As a result, a second air gap 23B in which only one electric wire forming the coil 8 is formed next to the second turn is formed. And a winding machine winds the 3rd turn around bobbin 13, and it becomes A3 stage. In the present modification, the coil 8 of the first turn to the third turn is the forward winding portion 910.

  Next, the winding machine forms the reverse transition portion 24 as shown in FIG. 12 (d), and the fourth turn of the coil 8 in the second air gap 23B sandwiched between the coil 8 of the second turn and the third turn. It forms and becomes the A4 stage. Next, as shown in FIG. 12 (e), the winding machine forms the reverse transition portion 24 and the fifth turn of the coil 8 in the first air gap 23A sandwiched by the coil 8 of the first turn and the second turn. It forms, and becomes A5 stage. In the present modification, the coil 8 at the fourth turn and the fifth turn is the reverse winding portion 920. Finally, the winding machine winds the coil 26 of the sixth turn in the second layer so as to contact the coil 25 of the fifth turn wound in the first air gap 23A as shown in FIG. 12 (f). Stage A6.

According to the third modification, the following effects can be obtained.
(5) The block 15 has a first air gap 23A and a second air gap 23B. The reverse winding part 920 is wound in order from the space | gap which exists in an inner peripheral side about the space | gap which exists in multiple numbers. Therefore, the angle of the reverse transition portion 24 can be made gentle, and slippage of the reverse transition portion 24 due to the tension when winding the coil 8 is less likely to occur. Therefore, the coil 8 is further less likely to drop out of the first air gap 23A and the second air gap 23B.

(Modification 4)
In the first embodiment, as shown in FIG. 2 and FIG. 3, the blocks 15 constituting the stator 3 are provided with the concentrated winding coil 8B described with reference to FIG. However, at least one block 15 may be provided with the concentrated winding coil 8B.

(Modification 5)
In the first embodiment, as shown in FIG. 2 and FIG. 3, the stator 3 is provided with a plurality of divided core blocks 12 which can be physically separated. In other words, the stator 3 in the first embodiment adopts a so-called split core method. However, the stator 3 may adopt a so-called integral core system using an integrally molded core. Also in this case, the same effects as those of the first embodiment can be obtained.

-Second embodiment-
A second embodiment of a rotary electric machine and a stator according to the present invention will be described with reference to FIGS. 13 to 14. In the following description, the same components as in the first embodiment will be assigned the same reference numerals and differences will be mainly described. The points that are not particularly described are the same as in the first embodiment. The present embodiment differs from the first embodiment mainly in that the width of the bobbin is not uniform.

  FIG. 13 is a view showing a bobbin 13A in the second embodiment. FIG. 13 shows the bobbin 13A from the same viewpoint as FIG. 9 in the first embodiment. The bobbin 13A includes arc-shaped guides g1 to g5 in contact with the first layer of the coil 8 to be wound. In the second embodiment, as in the first embodiment, the air gap 23 is formed at the second position from the back yoke side in the winding possible region 131, that is, at the position of the guide g2. Hereinafter, the guide g1 and the guide g2 may be referred to as a first contact portion, and the guides g3 to g5 may be referred to as a second contact portion.

  In FIG. 13, reference numeral 135 denotes a central axis of the bobbin 13A, reference numeral 132 denotes a reference position of the guides g1 and g2, and reference numeral 133 denotes a reference position of the guides g3 to g5. Reference numeral 134 is an inner wall of the bobbin 13A. The positional relationship between the respective reference positions and the guides is, for example, a relation where the position closest to the central axis 135 of the arc-shaped guide matches the reference position. However, if all the guides g1 to g5 have the same relationship with the reference position, another reference may be adopted.

  A distance between the first reference positions 132 passing through the central axis 135, in other words, a bobbin width of the first reference position 132 is set to ha. Further, the distance between the second reference positions 133 passing through the central axis 135, in other words, the bobbin width of the second reference position 133 is hb. hb is larger than ha. That is, the guides g3 to g5 are farther from the central axis 135 than the guides g1 and g2, and a step of hb-ha occurs between the guides g2 and g3.

  FIG. 14 is a view showing a state in which the coil 8 is wound around the bobbin 13A. However, FIG. 14 shows only the cross section of the coil 8. Since the step of hb-ha is generated between the guide g2 and the guide g3 as described above, the coil 8 is less likely to come off due to the step after transitioning to the air gap 23 after winding the fourth turn.

According to the second embodiment described above, the following effects can be obtained.
(6) In the bobbin 13, the gap 23 and the gap 23 on the back yoke side from the air gap 23 and the air gap 23 in which the reverse winding portion 920 is wound at positions contacting the coil 8 are the guide g1 and the guide g2, that is, the first contact portion. In the bobbin 13, the guide g 3 to the guide g 5, that is, the second contact portion is an inner peripheral side from the air gap 23 at a position in contact with the coil 8. The bobbin width ha of the first contact portion is narrower than the bobbin width hb of the second contact portion. Therefore, the coil 8 wound around the air gap 23 is unlikely to come off.

(Modification of the second embodiment)
In the second embodiment described above, the guides g1 to g5 are arc-shaped, but the guides g1 to g5 may be flat.

-Third embodiment-
A third embodiment of a rotating electrical machine and a stator according to the present invention will be described with reference to FIG. In the following description, the same components as in the first embodiment will be assigned the same reference numerals and differences will be mainly described. The points that are not particularly described are the same as in the first embodiment. The present embodiment differs from the first embodiment mainly in that a groove is provided on the end face of the bobbin.

  FIG. 15 is a view showing a bobbin 13B according to the third embodiment. The bobbin 13B has a groove 28 corresponding to the pitch of the first layer forward winding portion 910 on the bobbin end surface 27 on the coil end side. Since the bobbin 13B has the groove 28, the transition of the coil 8 at the bobbin end surface 27 at two winding pitch can be easily performed at the time of manufacture, and the positional deviation of the electric wire at the bobbin side surface 29 can be prevented after the manufacture. However, the groove 28 may not be provided with the grooves 28 corresponding to all the forward winding parts 910, and may be provided with the grooves 28 corresponding to at least two winding pitches.

According to the third embodiment described above, the following effects can be obtained.
(7) The bobbin 13B is provided with the groove 28 in which the forward winding portion 910 is wound at the end surface in the height direction.
Therefore, the transition of the coil 8 at the bobbin end surface 27 can be easily performed at the time of manufacture, and the positional deviation of the electric wire at the bobbin side surface 29 can be prevented after the manufacture.

  Each embodiment and modification mentioned above may be combined respectively. Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments considered within the scope of the technical idea of the present invention are also included within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 3 ... Stator 5 ... Shaft 6 ... Bearing 7 ... Input terminal 8 ... Coil 8B ... Concentrated coil 13, 13, 13B ... Bobbin 15 ... Block 23 ... Air gap 24 ... Reverse transition part 28 ... Groove 131 ... Winding Wireable region 900 ... trapezoidal region 910 ... forward winding portion 920 ... reverse winding portion

Claims (14)

A rotating electrical machine comprising a stator and a rotatable rotor inside the stator,
The stator is
An iron core that is cylindrical and has teeth,
A bobbin formed around the core;
And a plurality of concentrated winding coils in which a coil is wound in a concentrated manner on teeth of the core through the bobbin.
In the first layer in contact with the teeth, at least one of the concentrated winding coils is wound sequentially while moving to the inner circumferential side with the back yoke side of the iron core as the starting point and at least one place as an air gap. A rotary electric machine comprising: a section; and a reverse winding section wound around the gap while shifting from the inner circumferential side to the back yoke side. In the rotating electrical machine according to claim 1,
The air gap is a rotating electrical machine adjacent to a winding start point of the coil. In the rotating electrical machine according to claim 1,
There are a plurality of the air gaps,
The said reverse winding part is a rotary electric machine wound in order from the said space | gap which exists in the said inner peripheral side about the said space | gap which exists in multiple numbers. In the rotating electrical machine according to claim 1,
A rotating electrical machine in which the coil is further wound in the upper layer in contact with the coil wound in the air gap. In the rotating electrical machine according to claim 1,
A rotating electrical machine including at least two of the concentrated winding coils continuously wound via a crossover wire. In the rotating electrical machine according to claim 1,
In the bobbin, the back yoke side is a first contact portion from the air gap and the air gap at which the coil is in contact with the coil and in which the reverse winding portion is wound.
Assuming that the inner circumferential side of the bobbin is in contact with the coil and the inner circumferential side is a second contact portion in the bobbin,
A rotating electrical machine wherein the bobbin width of the first contact portion is narrower than the bobbin width of the second contact portion. In the rotating electrical machine according to claim 1,
The rotary electric machine, wherein the bobbin has a groove in which the forward winding portion is wound around an end surface in a height direction of the bobbin. An iron core that is cylindrical and has teeth,
A bobbin formed around the core;
And a plurality of concentrated winding coils in which a coil is wound in a concentrated manner on teeth of the core through the bobbin.
In the first layer in contact with the teeth, at least one of the concentrated winding coils is wound sequentially while moving to the inner circumferential side with the back yoke side of the iron core as the starting point and at least one place as an air gap. A stator, and a reverse winding portion wound around the gap while shifting from the inner circumferential side to the back yoke side. In the stator according to claim 8,
The air gap is a stator adjacent to a winding start point of the coil. In the stator according to claim 8,
There are a plurality of the air gaps,
The said reverse-winding part is a stator wound in order from the said space | gap which exists in the said inner peripheral side about the said space | gap which exists in multiple numbers. In the stator according to claim 8,
A stator in which the coil is further wound in the upper layer in contact with the coil wound in the air gap. In the stator according to claim 8,
A stator including at least two of the concentrated winding coils wound continuously via a crossover wire. In the stator according to claim 8,
In the bobbin, the back yoke side is a first contact portion from the air gap and the air gap at which the coil is in contact with the coil and in which the reverse winding portion is wound.
Assuming that the inner circumferential side of the bobbin is in contact with the coil and the inner circumferential side is a second contact portion in the bobbin,
The bobbin width of the first contact portion is narrower than the bobbin width of the second contact portion. In the stator according to claim 8,
The said bobbin is a stator provided with the groove | channel by which the said forward-winding part is wound by the end surface in the height direction of the said bobbin.

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