JP6373494B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine such as a magnet generator mounted on a vehicle such as a motorcycle.

  Generally, a vehicle such as a two-wheeled vehicle includes a generator that generates electric power by using rotation of an engine mounted on the vehicle. The battery is charged with the power generated by the generator, and the power of the electric system of the vehicle is covered by the charged power.

  As this generator, a so-called magnet generator as a rotating electrical machine is frequently used. This magnet generator includes a rotor with a magnet (rotor) arranged inside the crank cover of the engine and a stator (stator) arranged inside the rotor in the radial direction. The stator includes a core having a plurality of teeth, and a conductive wire (copper wire) is wound around an insulating portion of a bobbin of a portion attached to the plurality of teeth, and a single-phase or three-phase winding portion (a power generation coil) ) Is formed.

  The rotor is coupled to one end of the crankshaft of the engine, and the rotor, that is, the magnet rotates as the engine rotates, and a single-phase or three-phase alternating current is induced in the winding portion by the rotating magnetic field generated by the rotation. This induced current flows from the lead-out end of the winding part to the output lead wire and is supplied to the electric circuit of the vehicle.

  In order to reduce the size and weight of rotating electrical machines such as generators, the conductors (copper wires) are arranged more accurately so that the conductor wires (copper wires) are arranged as densely as possible on the stator teeth. The outer diameter of the stator is reduced by increasing the winding space factor of the conducting wire (copper wire) by winding.

  As a method for increasing the winding space factor, for example, as described in Patent Document 1, for example, a winding machine is used to apply a relatively high tension to a conductive wire (copper wire) and wind it around a stator tooth. In accordance with the shape of the teeth, the outer diameter of the stator coil is reduced.

  By the way, in the case of concentrated winding of conductive wires (copper wires), a plurality of winding layers are formed on the teeth of the stator. If the first layer winding is not aligned, the second layer winding is formed. It does not follow the first layer, and as a result, the finish of the coil is greatly disturbed. In order to wind the first-layer windings in an aligned manner, as described above, it is necessary to apply tension to the conductive wire (copper wire) to increase and fix the friction between the bobbin insulating portion. That is, the winding portion already wound is prevented from moving in the winding traveling direction (for example, radially outward in the first layer) due to the pulling force of the conducting wire (copper wire) generated by the winding machine. The teeth tightening force of the conducting wire (copper wire) is increased.

  On the other hand, a power generating coil made of a conductive wire (copper wire) not only has a high component cost, but is very heavy, so that the generator itself becomes heavy. Therefore, in recent years, an aluminum wire has been used instead of the conducting wire (copper wire).

JP 2006-94632 A

  FIG. 11 is an enlarged cross-sectional view of a conventional winding part.

  The aluminum wire A has a lower tensile strength than the conducting wire (copper wire), and when it is applied to the tooth T under tension, the tension may cause elongation or breakage. Therefore, the aluminum wire A needs to be wound with a tension lower than that of the conducting wire (copper wire). As a result, the friction between the aluminum wire A and the insulating portion B of the bobbin is sufficiently obtained compared to the conducting wire (copper wire). As shown in FIG. 11, the teeth tightening force D of the aluminum wire A is smaller than the pulling force F of the aluminum wire A generated by the winding machine, and the first-layer winding is disturbed (slack, deviation) Z. It tends to occur. Further, when the winding of the first layer is disturbed, the winding is also disturbed after the second layer and the finish of the coil is greatly disturbed.

  Also, since the aluminum wire has a higher electrical resistivity than the conducting wire (copper wire), it is necessary to use an aluminum wire having a larger diameter than the conducting wire (copper wire) in order to obtain the same output efficiency as that of the conducting wire (copper wire). However, if a thick aluminum wire is used and the windings are further distorted, the outer diameter of the stator may not fit within the same size as when a conductive wire (copper wire) is used.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotating electrical machine capable of winding a first-layer winding in an aligned manner with a low tension in a stator winding using an aluminum wire. There is.

To achieve the above object, a rotating electrical machine according to the present invention includes a rotor that is rotatably supported, a stator having a core that is disposed between the rotor and a gap of a predetermined distance, and the core. A bobbin to be mounted, and the core includes a plurality of teeth extending outward in the radial direction RA. The teeth constitute a winding portion together with an insulating portion of the bobbin, and an aluminum wire is formed on the winding portion. A winding portion is formed by winding, and the width of the winding portion is configured so as to gradually spread from the start of winding of the aluminum wire to the end of winding toward the winding progress direction of the first layer. .

  As a result, even if an aluminum wire is wound with a tension lower than that of the conductive wire (copper wire), the first-layer winding is not disturbed and can be wound in alignment, and the outer diameter of the stator is used for the conductive wire (copper wire). It is possible to fit within the same size as when it was.

The side view seen from the axial direction of the arrow I shown in FIG. 2 based on 1st embodiment of the magnet type generator of this invention. FIG. 2 is a schematic cross-sectional view along the line II-II in FIG. 1. The side view which shows the laminated board which comprises the stator of the magnet type generator which concerns on this embodiment. The perspective view which shows the bobbin division body which comprises one side of the bobbin of the division structure which concerns on this embodiment. The expanded sectional view of the coil part concerning this embodiment. The side view which shows the crossover between the winding parts which concerns on this embodiment. The expanded sectional view of the coil | winding part which concerns on 2nd embodiment of this invention. The expanded sectional view of the coil | winding part which concerns on 3rd embodiment of this invention. The expanded sectional view of the coil | winding part which concerns on 4th embodiment of this invention. The expanded sectional view of the coil | winding part which concerns on the modification of 4th embodiment of this invention. The expanded sectional view of the conventional winding part.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a magnet generator and a wiring mechanism (structure) thereof according to the invention will be described with reference to the accompanying drawings.

(First embodiment)
1 to 3 show an outline of the structure of a single-phase magnet generator as a rotating electrical machine according to the first embodiment.

  The magnet generator 1 (hereinafter sometimes simply referred to as “generator”) is attached, for example, in the vicinity of an engine of a motorcycle (not shown), and generates electricity by being rotated by the rotational force of the engine. The electric power generated by the generator 1 is supplied to a vehicle-side electric circuit (not shown).

  The generator 1 includes a stator (stator) 10 and a rotor (rotor) 60. The stator 10 includes a core 20, a bobbin 30 and a winding part 50. The core 20 is formed by laminating thin metal plates such as iron or electromagnetic steel plates. The core 20 has a substantially annular core body 21 (see FIGS. 2 and 3).

  In the following description, for convenience of description, the length direction of the virtual central axis O (see FIG. 3) of the core body 21 is referred to as an axial direction AX. Further, a direction radially extending along a cross section orthogonal to the central axis O around the central axis O is referred to as a radial direction RA, and a direction around the core body 21 is referred to as a circumferential direction CR. With the core 20 mounted on the generator 1, the axial direction AX, the radial direction RA, and the circumferential direction CR coincide with the axial direction, radial direction, and circumferential direction of the generator 1, respectively. Hereinafter, the core 20 is demonstrated as what is mounted in the generator 1. FIG.

  The core 20 includes a plurality of teeth 22 extending from the core body 21 to the outside in the radial direction RA in addition to the annular core body 21 described above (see FIG. 3). In the present embodiment, twelve teeth 22 are provided at equal intervals in the circumferential direction of the core body 21.

  The bobbin 30 is an insulator formed in an annular shape with, for example, an insulating resin, and has a split structure that is divided into two parts in the axial direction AX. Among these, FIG. 4 shows one bobbin divided body 30A of the divided structure. In the state where the two bobbin divided bodies 30A and 30B (see FIG. 2) are combined with each other, the bobbin 30 has an annular bobbin body 31 and a plurality of insulating portions 32 provided outside the bobbin body 31 in the radial direction RA. In preparation. In the present embodiment, twelve insulating portions 32 are provided at equal intervals in the circumferential direction CR of the bobbin main body 31.

  Hereinafter, a description will be given in a state in which one bobbin 30 is configured by assembling two bobbin divided bodies 30A and 30B.

  The bobbin body 31 of the bobbin 30 faces the core body 21, and each of the plurality of insulating portions 32 faces each of the plurality of teeth 22, and the one surface 23 in the axial direction AX of the core 20 so as to sandwich the core 20. It is provided on the side (crank cover side) and the other surface 24 side (crankshaft side).

  As shown in FIG. 4, a plate-like stopper 33 extending in the surface direction parallel to the axis of the bobbin main body 31 is formed in the vicinity of the insulating portion 32 of the bobbin main body 31. A plate-like stopper 44 extending in the surface direction parallel to the axis of the bobbin main body 31 is formed at the end of the insulating portion 32 opposite to the bobbin main body 31.

A winding portion 80 is formed by the teeth 22 and the insulating portions 32 of the two bobbins 30 sandwiching the teeth 22 from both sides in the axial direction AX of the core 20. For example, an aluminum wire 81 is concentrated on the winding portion 80. The winding part (electric power generating coil) 50 is formed by winding with a winding. Here, the concentrated winding refers to a configuration in which a plurality of one coil (single coil) configured by winding to one tooth is formed, and a single coil is formed so as to straddle a plurality of teeth. The structure that forms is called distributed winding. In the present embodiment, a plurality of winding portions 50 are formed by winding a single insulation-coated aluminum wire 81 around the insulating portions 32 of the plurality of winding portions 80 a predetermined number of times. Further, when a predetermined number of windings do not fit in the winding part 80, the windings are configured to form a plurality of layers on the same winding part 80.
The insulating portion 32 ensures the insulation between the winding portion 50 and the teeth 22 of the core 20.

  In the present embodiment, the winding portion 50 is formed by winding the aluminum wire 81 around the winding portion 80 while pulling it with a predetermined tension using a winding machine (not shown), for example. Thereby, the winding part 50 can be tightly wound around the inclined surface 82 of the insulating part 32 of the winding part 80. Here, the winding portion 50 is positioned in the radial direction RA by the stopper 44 and the stopper 33 of the bobbin 30. The aluminum wire 81 is wound with a tension lower than the tension when a conducting wire made of a normal copper wire is wound.

  As shown in FIG. 5, the circumferential CR width of the teeth 22 constituting the winding portion 80 gradually widens from the core body 21 side to the opposite side (stopper 44 side) from the core body 21. . Similarly, the circumferential portion CR width of the insulating portion 32 sandwiching the teeth 22 gradually widens from the bobbin main body 31 side to the opposite side (stopper 44 side) from the bobbin main body 31.

  That is, the winding portion 80 has the same shape as the tooth 22 and is set so that the stopper 44 side width W2 is larger than the bobbin body 31 side width W1. The thickness in the circumferential direction of the insulating portion 32 of the bobbin 30 constituting the winding portion 80 is constant from the inner diameter side toward the outer diameter side. The circumferential thickness of the insulating part 32 is determined from the required dielectric strength, and the inclination angle of the insulating part 32 is the same as the inclination angle of the teeth 22. The first layer of the aluminum wire 81 starts from the winding start S on the bobbin main body 31 side toward the winding end E toward the winding end E on the stopper 44 side outside the radial direction RA (winding with an arrow in FIG. 5). It indicates the direction of travel). With these configurations, the winding portion (power generation coil) 50 made of the aluminum wire 81 wound around the winding portion 80 becomes wider from the inner diameter side toward the outer diameter side, and the bobbin 30 is inclined. It is parallel. That is, the circumferential width of the winding portion (power generation coil) 50 wound around the tooth 22 is small on the inner diameter side and larger on the outer diameter side.

  On the other hand, as shown in FIG. 2, the core body 21 of the core 20 is fixed to the inside of the engine cover 2 with, for example, bolts. A boss 4 is attached to the end of the crankshaft 3 of the engine (not shown). Therefore, the boss 4 rotates together with the crankshaft 3 during engine operation.

  The rotor 60 is provided outside the radial direction RA of the stator 10 via a predetermined gap. The rotor 60 includes a cylindrical portion 61 that forms an annular shape in the circumferential direction CR, and a wall portion 64 that closes one opening of the cylindrical portion 61 in the axial direction AX. The cylinder part 61 and the wall part 64 are integrally formed with each other. The boss 4 is fixed to the wall portion 64.

  A plurality of magnets (permanent magnets) 62 are provided at equiangular intervals along the circumferential direction CR on the inner wall of the cylindrical portion 61. In the present embodiment, a total of twelve magnets 62 are provided so that the directions of their magnetic poles (N pole, S pole) are alternately opposite in the radial direction RA. And as shown in FIG. 1, the protrusion 63 is formed in a part of outer peripheral surface of the cylinder part 61. As shown in FIG.

  The wall portion 64 is fixed to the boss 4 so that the cylindrical portion 61 of the rotor 60 is located outside the radial direction RA of the core 20. As a result, the tip of the tooth 22 of the core 20 is positioned to face the magnet 62. The rotor 60 rotates together with the crankshaft 3 and the boss 4 during engine operation. When the rotor 60 rotates, an induced electromotive force is generated in the winding portion 50 formed in the insulating portion 32 (the winding portion 80) that covers the teeth 22 facing the magnet 62. As a result, a current is generated in the winding part 50. The electric current generated in the winding part 50 passes through an output cable (wire harness) 5 (see FIG. 2) that connects the winding part 50 and the vehicle-side electric circuit to an electric load such as a battery of a motorcycle or a headlamp. To be supplied. Thus, the generator 1 of this embodiment is an outer rotor type generator.

  A rotation sensor 70 is provided outside the radial direction RA of the rotor 60 via a predetermined gap. The rotation sensor 70 outputs a signal corresponding to the rotation position of the protrusion 63 when the rotor 60 rotates. The signal is transmitted to an electronic control unit (hereinafter referred to as “ECU”) (not shown) via the wire harness 71. Thereby, the ECU can detect the rotational position of the rotor 60, that is, the rotational position of the crankshaft 3.

  Thus, according to the rotating electrical machine of the present embodiment, various functions and effects can be obtained as described below.

  First, since the aluminum wire 81 is used for the wire that forms the plurality of winding portions 50 of the stator (stator) 10, the generator itself can be made lighter, and a conductor made of copper wire is used. Compared to this, the parts cost can be greatly reduced.

  Further, as shown in FIG. 5, the circumferential CR width of the winding portion 80 around which the aluminum wire 81 is wound is set to the winding traveling direction from the winding start S in the first layer of the aluminum wire 81 to the winding end E in the first layer, for example, If it is an odd-numbered layer such as the first layer, it is configured to gradually spread outward from the bobbin body 31 in the radial direction.

  For this reason, the surface of the winding unit 80 on which the aluminum wire 81 is wound is inclined with respect to the winding traveling direction to form the inclined surface 82, and the aluminum wire 81 generated by the winding machine is wound on the winding unit 80. Is divided into a direction D1 parallel to the inclined surface 82 and a direction D2 orthogonal to the inclined surface 82. Therefore, the tightening force in the direction D1 parallel to the inclined surface 82 can counter the pulling force F of the aluminum wire 81 generated by the winding machine.

  At any position of the predetermined number of turns in the first layer of the winding part 50, the pulling force F of the winding machine is always acting in the winding traveling direction, but the circle of the winding part 80 (the teeth 22, the insulating part 32). Since the circumferential CR width is wider than the portion wound immediately before, the movement of the winding portion 50 in the winding traveling direction is suppressed. As a result, the aluminum wire 81 is wound with a tension lower than that of the conducting wire (copper wire). However, the winding of the first layer is not disturbed, and the winding portion 50 can be wound in alignment. Then, by winding the first layer winding in alignment, the second and subsequent layers follow the immediately preceding layer, so that all the layers become aligned windings, and the outer diameter of the stator 10 is made of a conductive wire (copper wire). It is possible to fit within the same size as time. That is, it is preferable that the winding start of the winding portion 50 be a portion where the circumferential width of the winding portion 80 is the narrowest, that is, the inner diameter side. The winding traveling direction of the winding part 50 is preferably directed in the direction in which the circumferential width of the winding part 80 is increased.

  Furthermore, since the aluminum wire 81 can be wound with a low tension, elongation and breakage due to the tension can be prevented. In particular, the tensile strength of aluminum is about a fraction of that of copper. Therefore, from the viewpoint of preventing breakage, the tensile tension during winding of the aluminum wire 81 is a fraction of that of a copper wire. Need to lower.

  The winding part 50 wound around the winding part 80 is bonded to the bobbin 30 while the aluminum wires 81 are fixed together by an adhesive or the like after being wound.

  When a plurality of winding portions 50 (coils) are connected by a single aluminum wire 81, as shown in FIG. 6, there is a crossover wire 83 at a portion extending between the winding portion 50 and the winding portion 50. That is, the aluminum wire 81 that exists between the winding end portion Z of one winding portion 50 and the winding start portion X of the adjacent winding portion 50 is a crossover wire 83.

  Among the connecting wires 83, the first winding start and the last winding end of the single aluminum wire 81 around the winding portion 50 are so-called lead wires, and the lead wires are directly or indirectly connected to an external circuit, for example, a wire harness. (For example, output cable 5). Alternatively, if the winding portion 50 is a multiphase coil such as a three-phase coil, the connecting wire 83 is connected to a neutral point in star connection, although not shown in detail.

  By the way, since the magnet type generator 1 which concerns on this application is attached to engines, such as a two-wheeled vehicle, or its vicinity as mentioned above, it is easy to transmit a vibration. If the crossover wire 83 is not fixed, the crossover wire 83 may be broken by this vibration, or the insulating film of the crossover wire 83 may be rubbed to cause an electrical short circuit.

  For this reason, it is desirable that the crossover wire 83, to which the tension tension during winding is not applied, be firmly and stably fixed to the bobbin body 31 of the bobbin 30, for example.

  The condition of the adhesive and fixing in a stable state of the crossover wire 83 is that the both ends of the crossover wire 83, that is, one is a winding start portion X and the other is a stable fixation between the winding end portion Z and the winding portion 50. That is, if the aligned winding of the first layer of the winding part 50 is not stable, the adhesive does not penetrate uniformly, and the fixing becomes unstable. When the first-layer fixing becomes unstable, the fixing of the winding start portion X connected to the crossover wire 83 becomes unstable, the fixing of the crossover wire 83 becomes unstable, and the first-layer fixing is unstable. The adhesion of the outermost layer of the winding part 50 wound thereon is also unstable. Since the winding end portion Z of the outermost layer is also connected to the crossover wire 83, if the fixation of the outermost layer is unstable, the fixing of the crossover wire 83 is also unstable. From the above, it goes without saying that it is important to stabilize the first aligned winding of the winding portion 50.

  In the present application, as described above, the winding portion 50 can be wound in an aligned manner without causing any disturbance in the winding of the first layer. Then, by winding the first layer winding in alignment, the second and subsequent layers follow the previous layer, so that all the layers become aligned windings, and the movement of the crossover wire 83 due to aerial wiring and vibration can be suppressed. . As a result, the crossover wire 83 can be firmly fixed to, for example, the bobbin main body 31 of the bobbin 30 in a stable state.

  Furthermore, the aluminum wire 81 has a property that it is relatively easy to stretch. If the winding 50 is not firmly fixed, the aluminum wire 81 may be stretched, which is not preferable. Specifically, when the aluminum wire 81 is stretched, the wire diameter is reduced, the electrical resistance is increased, and there is a possibility that the performance is lowered and the temperature of the winding portion 50 is increased.

  In the present application, as described above, since the winding portion 50 can be stably fixed, it is possible to prevent the aluminum wire 81 from being stretched, and to suppress the performance degradation and the temperature rise of the winding portion 50.

  By the way, as described above, the bobbin 30 has a divided structure in which the bobbin 30 is divided into front and rear parts in the axial direction AX (bobbin divided bodies 30A and 30B). The bobbin 30 takes into account variations occurring in the axial direction of the bobbin 30 and variations occurring in the axial direction of the core 20, and in any case in a state where the core 20 including the teeth 22 is sandwiched from both sides in the axial direction AX. The dimension AX in the axial direction is set so that a gap is always formed on the mating surface of the divided portion with the core 20 sandwiched therebetween. Since the bobbin 30 is formed by resin molding, the bobbin 30 has a shape that is slightly outwardly opened because it has a slip-out slope from the mold and also has deformation (warping) after molding.

  In the above-described structure of the bobbin 30, for example, when a conducting wire is wound around the winding portion with high tension, the conducting wire may directly touch the teeth 22 in the gap between the divided portions. And when the insulation coating of a conducting wire is torn, a short circuit may occur. Further, there is a possibility that the split edge portion or corner portion of the bobbin 30 may be cracked due to the high tension of the wound conductive wire.

  Further, the gap described above is formed not only in the insulating portion 32 of the bobbin 30, but also in the plate-like stopper 44 formed on the end portion of the insulating portion 32 opposite to the bobbin main body 31, for example, When the winding end E of the winding portion 50 is on the stopper 44 side, for example, when the conducting wire is wound with a high tension, the conducting wire at the winding end E is bitten between the conducting wire wound immediately before and the stopper 44. There is also a possibility that a short circuit may occur or a lead wire may be extended.

  However, according to the rotating electrical machine of the present embodiment, the aluminum wire 81 can be wound with a low tension, so there is no possibility that the aluminum wire 81 directly touches the teeth 22 in the gap between the divided portions of the bobbin 30, and the bobbin The possibility of cracks occurring at 30 divided edge portions and corner portions is reduced. Furthermore, the possibility that the aluminum wire 81 is extended is low.

  Further, according to the rotating electrical machine of the present embodiment, since the tension at the time of winding is low, the resistance to the cold stress in the usage environment for the aluminum wire 81 is improved. The aluminum wire 81 has a larger linear expansion coefficient than the conventional copper wire. That is, the difference in the coefficient of linear expansion is large with respect to the tooth portion whose main component is iron. Therefore, the winding part 50 made of the aluminum wire 81 is greatly contracted at a low temperature, and there is a possibility that it will bite into the tooth part. However, the stress at this time does not become too great due to the low tension during winding. Furthermore, although the rotating electrical machine of the present embodiment is mounted on the engine and is given a large vibration, the total stress is relatively small for the above reasons, and damage to the aluminum wire 81 and the like can be suppressed. .

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences from the first embodiment will be described below.

  In the first embodiment, the winding portion 80 has shown an example in which the circumferential CR widths of both the tooth 22 and the insulating portion 32 gradually increase toward the stopper 44 outside the radial direction RA. In the second embodiment, as shown in FIG. 7, the circumferential width CR width of the teeth 22 constituting the winding portion 80 is constant over the radial direction RA as usual.

  On the other hand, only the insulating portion 32 that sandwiches the teeth 22 has a circumferential CR width that gradually widens from the bobbin main body 31 side toward the opposite side of the bobbin main body 31 (stopper 44 side). Therefore, the winding part 80 has the same shape as the insulating part 32 of the bobbin 30, and its final shape is such that the stopper 44 side width W2 is larger than the bobbin body 31 side width W1, as in the first embodiment. Composed.

  In the case of this second embodiment, the conventional core 20 can be used as it is. Others have the same operations and effects as the first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences from the first embodiment will be described below.

  In the first and second embodiments described above, the winding portion 80 has an example in which the circumferential CR width gradually increases toward the stopper 44 outside the radial direction RA. As shown in FIG. 8, the winding portion 80 has its axial direction AX width gradually widening toward the stopper 44 outside the radial direction RA.

  In this case, since the axial AX width (thickness) of the teeth 22 is constant, only the insulating portion 32 sandwiching the teeth 22 has an axial AX width from the bobbin main body 31 side as in the second embodiment. It gradually widens toward the side opposite to the bobbin main body 31 (stopper 44 side).

  This third embodiment is suitable, for example, when the interval between adjacent teeth 22 is small. Others have the same operations and effects as the first embodiment.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences from the first embodiment will be described below.

  In the fourth embodiment, a groove 84 is formed on the surface 82 of the insulating portion 32 around which the aluminum wire 81 is wound so that the aluminum wire 81 follows a spiral shape.

  As shown in FIG. 9, the groove 84 may be in all the winding directions of the surface 82, or may be only in the tooth root portion on the winding start side as shown in FIG. 10. The root portion has a narrower circumferential width (bobbin body 31 side width W1) than the outer diameter side width (stopper 44 side width W2), and the axial section of the root portion is not shown in detail. It becomes vertically long in the direction. Since the flyer portion (winding portion) of the winding machine (not shown) rotates on a constant circumferential track, it is difficult to follow the winding portion 80 when the cross section of the root portion is vertically long, and the winding process becomes difficult.

  However, if the groove 84 is formed at the root portion as in the present embodiment, it can be a solution to the above problem.

  Further, the depth of the groove 84 formed in the surface 82 of the insulating portion 32 is determined from the fixing force (D1) at the time of winding, but is preferably about 1/4 to 1/8 of the wire diameter. When the groove 84 is deep, the heights of the protrusions on both sides of the groove 84 become relatively high, and when combined with the thickness of the insulating part 32 necessary for insulation from the core 20, it becomes very thick. If this thickness is increased, it results in hindering heat dissipation of the core 20 and the winding portion 50, which is not preferable.

  However, in the present embodiment, the depth of the groove 84 can be reduced as compared with the case where the groove is formed on the surface of the conventional straight-shaped insulating portion. As a result, it is excellent in heat dissipation, contributes to suppression of mold cost and improvement of mold life, and can suppress the manufacturing cost.

  On the other hand, the ease of winding work at the root of the teeth 22 can be improved by providing R or chamfering at the corners of the bobbin 30. Furthermore, if the R and chamfering of the corner portion of the bobbin 30 are closer to the root portion of the tooth 22, the size of the winding is further improved. It is more preferable if the dimensional change is gradual.

(Other embodiments)
In the above-described embodiment, the circumferential CR width or the axial direction AX width of the winding portion 80 around which the aluminum wire 81 is wound is gradually increased from the winding start to the winding end of the aluminum wire 81 in the winding traveling direction. Although an example of the configuration is shown, although not shown, the width in both directions may be increased toward the winding traveling direction.

  In the above-described embodiment, the engine case (not shown) is configured such that the core 20 (core body 21) of the stator (stator) 10 is fixed to the inside of the engine cover 2 with, for example, a bolt and covered with the engine cover 2. Although an example in which the generator 1 is hermetically sealed has been shown, the present invention is not necessarily limited thereto. For example, the stator 10 is fixed to the base side of the crankshaft 3, for example, on the engine case side, and It is assumed that the case is not sealed.

  Furthermore, a switching circuit such as an inverter can be provided in an external electric circuit, and the generator 1 can be used as a starter generator.

  Furthermore, the present invention can be applied to the case where a copper wire is used instead of the aluminum wire 81 as in the prior art. For example, if you want to suppress the tensile force applied to the insulation film formed on the surface of the copper wire without increasing the tension when winding the conductor, or if the copper wire has insufficient scratch resistance function, the copper wire is thin in the insulation film This is useful when using things. And it is useful also when using the conducting wire which consists of a clad material which used both aluminum and copper.

  Furthermore, in the above-described embodiment, an example in which the insulating resin is formed into a bobbin shape in order to ensure the insulation between the aluminum wire 81 and the tooth 22 has been shown. You can also.

  Furthermore, it is not necessary to provide an insulating resin separate from the teeth 22 on the surface of the teeth 22.

  Moreover, although the example which used the aluminum wire 81 for the coil | winding part 50 was shown in embodiment mentioned above, this embodiment is applicable also to a copper wire with low tensile strength called a thin wire | line.

  In the above-described embodiment, the outer rotor type generator in which the rotor is provided outside the stator has been described. However, the rotor may be provided inside the stator. In this case, the rotating electrical machine can be used as an inner rotor type generator or motor. Furthermore, the rotating electrical machine may be configured to fix the rotor and rotate the stator relative to the rotor. Thus, the present invention is not limited to the above-described embodiments, and can be applied to various forms without departing from the gist thereof.

1 Magnet generator (rotary electric machine)
10 Stator (stator)
20 Core 22 Teeth 32 Insulating part 30 Bobbin 50 Winding part 60 Rotor (rotor)
80 Winding part 81 Aluminum wire

Claims (7)

A rotor (60) rotatably supported;
A stator (10) having a core (20) disposed with a gap of a predetermined distance between the rotor (60);
In a rotating electrical machine (1) comprising a bobbin (30) mounted on the core (20),
The core (20) includes a plurality of teeth (22) extending outward in the radial direction (RA),
While the said teeth (22) comprise a winding part (80) with the insulation part (32) of the said bobbin (30),
An aluminum wire (81) is wound around the winding part (80) to constitute a winding part (50),
The width of the winding part (80) is configured to gradually widen from the winding start (S) of the aluminum wire (81) to the winding end (E) in the winding direction of the first layer. A rotating electric machine that is characterized.   The rotating electrical machine according to claim 1, wherein the width of the winding part (80) is a circumferential direction (CR) width of the core (20).   The rotating electrical machine according to claim 1, wherein the width of the winding portion (80) is an axial (AX) width of the core (20).   The rotating electrical machine according to any one of claims 1 to 3, wherein the shape of the winding part (80) is the shape of the teeth (22).   The rotating electrical machine according to any one of claims 1 to 3, wherein the shape of the winding portion (80) is the shape of the insulating portion (32) of the bobbin (30). The rotating electrical machine according to any one of claims 1 to 5 , wherein the winding portion (50) is configured by concentrated winding. The bobbin (30) has a divided structure divided in the axial direction (AX) of the core (20), and a gap is formed in the mating surface of the divided part of the bobbin (30) with the core (20) sandwiched therebetween. The rotating electric machine according to any one of claims 1 to 6 , wherein

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