JP2007295764A - Stator of rotary electric machine and ac generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the space factor of a stator coil in the slot of the stator and to form a magnetic path surely around the rotor and the stator coil. <P>SOLUTION: The core comprises an annular outer core, and an inner core where a plurality of slots for winding the stator coil periodically open to the outer circumferential side, and teeth provided between the slots of the inner core are coupled on the inner circumferential side by means of a nonmagnetic member such as resin. Since the stator coil is not inserted from the inner circumferential side of each teeth of narrow width but can be inserted from the outer circumferential side, space factor of the stator coil in the slot of the stator can be enhanced. Furthermore, since a magnetic path is not formed easily on the inner circumferential side of each teeth because of a nonmagnetic member such as resin, the magnetic path can be formed surely from the rotor to the outer core. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine, a method for manufacturing the stator, and an AC generator.

  As an example in which a rotating electrical machine is mounted, an automobile will be described as an example. In recent years, automobiles tend to widen the interior of a vehicle without increasing the size of the vehicle itself. Therefore, each component must be mounted in a narrow space, and there is a demand for downsizing. However, as a rotating electrical machine, the size must be reduced while maintaining or improving efficiency. Such demands for both miniaturization and high efficiency are not limited to automobiles, but also apply to other products.

  Here, in order to achieve both reduction in size and high efficiency of the rotating electrical machine, there has been a demand for a higher space factor of a stator coil wound in a slot provided in a stator. However, in order to facilitate the formation of a magnetic path between the stator core and the rotor, it is necessary to narrow the innermost circumferential slot width of the stator core with respect to the slot width of the winding portion of the stator coil. There was a limit in inserting the stator coil with the insulating coating from the inner peripheral side without damaging it.

  Therefore, as shown in Patent Document 1, the stator core is divided into an inner core having a plurality of slots opened on the outer periphery and a cylindrical outer core attached to the outer periphery of the inner core, and the stator coil is separated from the outer periphery of the inner core. After mounting in the slot, the outer core is mounted to form the stator, whereby the space factor of the stator coil in the slot can be improved.

JP 2000-184632 A

  However, in Patent Document 1, the teeth are connected on the inner peripheral side so that the teeth do not come off due to the attractive force generated by the magnetic path formed between the inner core and the rotor. For this reason, when it is used for a motor, a magnetic path is formed in which the magnetic flux does not flow to the rotor side and the magnetic flux circulates at the connecting portion of the inner periphery of the teeth. Therefore, although the space factor of the stator coil in the slot is improved, the efficiency of the rotating electrical machine is inferior, and as a result, the efficiency as the rotating electrical machine cannot be improved.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stator for a rotating electrical machine that can improve the space factor of the stator coil in the slot and can reliably form a magnetic path around the rotor and the stator coil, a manufacturing method thereof, and an AC generator. There is.

  The stator of the rotating electrical machine according to the present invention is characterized in that the stator core is composed of an inner core and an outer core, and the inner peripheral sides of adjacent teeth in the inner core are connected by a nonmagnetic member.

  Moreover, the stator of the rotating electrical machine of the present invention is used for an AC generator, and the nonmagnetic member is characterized in that each tooth prevents the teeth from moving toward the inner peripheral side with respect to the outer core.

  The stator of the rotating electrical machine of the present invention is formed so that the teeth are connected to each other on the inner peripheral side of the inner core, and further, a nonmagnetic member is formed on the outer peripheral side of the portion to which the teeth are connected. In addition, it is manufactured by cutting the inner peripheral side of the inner core to the position of the nonmagnetic member.

  ADVANTAGE OF THE INVENTION According to this invention, while improving the space factor of the stator coil in the slot in a stator, a magnetic path can be reliably formed around a rotor and a stator coil.

  As an embodiment in which the rotating electrical machine of the present invention is used, an automotive alternator will be described. FIG. 1 is a side sectional view of the overall configuration of an automotive alternator.

  A pulley 2 as a rotation transmission member is fixed to one end side of the drive shaft 1 so as to rotate integrally with a bolt 3, and is connected to the pulley 2 from an engine as a drive source through an endless transmission band such as a belt. Rotational force is transmitted. The rotation transmission member can be a sprocket and the endless transmission band can be a chain.

Two serrations 4a and 4b are formed at a substantially central portion in the axial direction of the drive shaft 1 with a predetermined interval therebetween, and a Landel type iron core 5 as a rotor can rotate integrally with these serrations 4a and 4b. Has been inserted. The Landel iron core 5 includes two magnetic members 5a,
5b, and each magnetic member 5a, 5b engages with each serration 4a, 4b in the drive shaft 1 and has a shaft portion 7a having insertion holes 6a, 6b for restricting relative rotation.
7b, plate portions 8a and 8b provided at one end of the shaft portions 7a and 7b, and a plurality of tapered claws 9 extending substantially axially from the plate portions 8a and 8b (in the embodiment, each The magnetic members 5a and 5b are alternately provided with claws 9 so as to face each other, and the ends of the shaft portions 7a and 7b are arranged between the ends of the shaft portions 7a and 7b. Abut and are fixed to the drive shaft 1. The magnetic members 5a and 5b are restricted from moving in the axial direction by causing the material at both ends to plastically flow in the annular grooves 10a and 10b formed in the drive shaft 1.

  A field coil 11 with an insulation coating is wound between the shaft portions 7 a and 7 b of the Landell-type iron core 5 and the claws 9. Both terminal wires of the field coil 11 are connected to the drive shaft 1. A field current that is connected to the two slip rings 12 provided on the end side and controlled to obtain necessary power generation via the brush 13 is supplied from the outside. When a current is supplied to the field coil 11, a magnetic field is generated around the field coil 11 and a magnetic path is formed in the Landel type iron core 5.

A stator core 14 made of a magnetic material is disposed on the outer periphery of the Landell-type iron core 5 as a rotor via a predetermined gap, and a plurality of phases (in the plurality of slots 15 provided in the circumferential direction of the stator core 14 ( In this embodiment, a stator coil 16 having a six-phase insulating coating is wound. For this reason, when a current is supplied to the field coil 11, a magnetic path is formed across the Landel-type iron core 5 and the stator core 14, so that an AC voltage is generated in the stator coil 16 when the rotor rotates. The stator coil 16 has a circular cross section.

  The three-phase AC voltage generated in the stator coil 16 is rectified by a positive side diode and a negative side diode as a rectifier circuit provided on the opposite side in the axial direction from the pulley 2, and a direct current is taken out from the output terminal 29. The negative side diode is provided on the negative side heat radiating plate 17a, and the positive side diode is fixed to the positive side heat radiating plate 17b which is overlapped with the negative side heat radiating plate 17a.

  The stator core 14 is sandwiched and fixed by a bolt (not shown) between a hook-shaped front housing 18 provided on the pulley 1 side and a hook-shaped rear housing 19 provided on the slip ring 12 side. Brackets 18a and 19a for fixing to the vehicle are provided on the outer peripheral sides of the front housing 18 and the rear housing 19, and the drive shaft 1 is rotatably supported on the inner peripheral side. Ball bearings 21a and 21b are fixed to the housings 18 and 19, respectively. In addition, a rear cover 20 that is housed inside the rear housing 19 is secured with bolts so as to protect the slip ring 12, the brush 13, the rectifying element, the negative-side radiator plate 17a, the positive-side radiator plate 17b, and the like. These front housing 18, rear housing 19 and rear cover 20 are formed of a nonmagnetic aluminum alloy.

  Next, details of the stator according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view of a stator around which a stator coil is wound, and FIG. 3 is an enlarged view of a slot portion of the stator as a cross section. FIG. 4A is a perspective view of the inner core in the stator, and FIG. 4B is a perspective view of the outer core in the stator.

  As shown in FIGS. 2 and 4A and 4B, the stator 22 includes a stator core 14 including an inner core 14a disposed on the inner periphery and an outer core 14b disposed on the outer periphery of the inner core 14a. The stator coil 16 is wound around the inner core 14a.

As shown in FIG. 4 (a), the inner core 14a has a plurality of teeth 23 arranged radially (72 in this embodiment) so that a groove-shaped slot is opened radially between the teeth. A plurality (15 in this embodiment) 15 are formed in the circumferential direction, and the teeth 23 are connected to each other by a resin 26 as a nonmagnetic member made of a nonconductive material on the inner circumferential side. For this reason, it is difficult for the magnetic flux to flow from the inside of the teeth 23 to the adjacent teeth 23.

  The resin 26 is made of a thermoplastic resin or a thermosetting resin. When a thermoplastic resin is used, the resin 26 has better thermal conductivity than that using the thermosetting resin, and the heat of the teeth 23 is increased. Easy to come and go. Further, when a thermosetting resin that is cured by heat is used, the thermosetting resin is cured as the stator coil 16 and the stator core 14 generate heat, so that the strength as the inner core 14a is improved. As the thermoplastic resin, for example, PA, PPS, PBT, PEEK, PTFE and the like can be used, and as the thermosetting resin, for example, phenol resin, unsaturated polyester, epoxy and the like can be used. . Further, it is possible to include glass fiber or the like in order to improve the strength.

As shown in FIG. 3, tooth bridges 27 are provided at end portions on the inner peripheral side of the respective teeth 23 so as to protrude on both sides in the circumferential direction, and a resin 26 is connected between the adjacent tooth bridges 27. In addition, the stator coil 16 is wound in a state where the insulating paper 25 is wound in the slot 15 formed between the teeth 23. The width of the stator coil 16 is equal to that of one slot 15. The width is larger than the width of two stator coils 16, that is, the stator coils 16 are formed in a row in the slot 15. Further, the circumferential widths of the slot 15 and the teeth 23 are substantially the same.

  Further, the resin 26 is provided in the entire range in the axial direction of the inner core 14a in the teeth 23 as shown in FIG. 4A. Further, as shown in FIG. 3, the resin 26 and the inner peripheral side surface of the teeth 23 are provided. On the other hand, it is provided at substantially the same position in the radial direction of the inner core 14a. Specifically, the resin 26 and the teeth 23 are alternately provided in the entire range of the inner peripheral surface of the inner core 14a, and each inner peripheral surface constitutes a continuous arc surface, whereby the inner core 14a has an inner surface. The peripheral surface has a continuous cylindrical shape with no irregularities.

  Next, the outer core 14b will be described. The magnetic powder is constituted by a so-called dust core that is coated with a material such as an insulating material and a resin as a binder, and is compressed and molded by a molding die.

  As shown in FIG. 4B, the outer core 14b is formed in an annular cylindrical shape, that is, in an annular shape, and all of the corresponding portions of the teeth 23 of the inner core 14a on the inner peripheral side open to the inner peripheral side. Concave portions 24 are formed radially along the axial direction. In the recess 24, the outer peripheral ends of the teeth 23 of the inner core 14a are mounted. The outer core 14b is also composed of a dust core that is the same material and the same manufacturing method as the inner core 14a.

The inner core 14a and the outer core 14b configured as above are formed by pressing the outer peripheral side of each tooth 23 of the inner core 14a around which the stator coil 16 is wound into the recess 24 of the outer core 14b from the axial direction. A stator core 14 as shown in FIG.

  Next, the operation of the automotive alternator and the magnetic path formed in the stator core will be described with reference to FIGS.

  In order for the automotive alternator to generate power, first, a rotational force is transmitted to the pulley 2 from a driving source such as an engine via a belt. The rotation of the pulley 2 causes the Landel-type iron core 5 as a rotor and the field coil 11 mounted therein to rotate with respect to the stator core 14 via the drive shaft 1. In such a state where the rotor is simply rotating, power generation is not performed, but when a direct current is supplied to the field coil 11 from the outside via the brush 13 and the slip ring 12, the field coil 11 is surrounded. A magnetic field is formed. Therefore, the Landel-type iron core 5 is provided so as to surround the field coil 11, and the claws 9 alternately extend in the circumferential direction from both ends in the axial direction, so that different magnetic poles are provided between the claws 9 adjacent in the circumferential direction. It is formed.

  Here, since the magnetic flux formed in the Landel iron core 5 loses its place at the tip of the claw 9, it tends to flow to the claw 9 adjacent in the circumferential direction, but from the gap between the claw 9 adjacent in the circumferential direction. In addition, since the gap between the inner core 14a facing the outer peripheral surface of the claw 9 and the teeth 23 is smaller, most of the magnetic flux flows to the teeth 23 side.

  Here, when the teeth 23 are connected on the inner peripheral side as in the prior art, the magnetic flux does not circulate around the stator coil, and the magnetic flux circulates at the connection portion between the teeth 23. In the present invention, since the inner peripheral side of each tooth 23 is connected by the resin 26 as a non-magnetic member, the magnetic flux between the teeth 23 is reduced. For this reason, the magnetic flux which flowed to the teeth 23 shown in FIG. 3 flows to another tooth 23 via the outer core 14b, and further, a magnetic path is formed so as to return to the Landel type iron core 5 as a rotor. Thus, a voltage is generated in the stator coil 16 by forming a magnetic path around the stator coil 16. Since the Landell type iron core 5 is rotating and the stator coil 16 has three phases, the generated voltage is a three-phase AC voltage, but is full-wave rectified by a rectifier circuit and converted into a DC voltage. The The DC power generated in this way is supplied to a battery (not shown) via the output terminal 29. Each tooth 23 is attracted to the rotor side by forming a magnetic path. However, since the resin 26 exists between the teeth 23, the magnetic flux moves to the inside of the teeth 23. It is blocked as much as possible.

  Further, the current supplied to the field coil 11 is controlled in accordance with the remaining amount of the battery, thereby preventing a decrease in battery life due to excessive power supply. Thus, the electric power generated in the stator coil 16 varies in accordance with the state of the battery, the rotational speed, and the like.

  Next, a method for manufacturing a stator core will be described with reference to FIGS. FIG. 5 is a diagram illustrating a method for manufacturing the inner core. FIG. 6 is a perspective view of the manufactured inner core. FIG. 7 is a perspective view of a state in which a stator coil is wound around the inner core. FIG. 8 is a diagram illustrating a method for fixing the inner core and the outer core. FIG. 9 is a cross-sectional view of the finally manufactured stator core.

  First, the magnetic powder coated with insulating coating is put into a mold and compressed to mold the original shape of the inner core 14a as shown in FIG. In this original form, the teeth 23 are connected on the inner peripheral side, and all the teeth 23 are integrated in an annular shape. In addition, concave nonmagnetic member mounting portions 28 are provided on the outer peripheral sides of the locations where the teeth 23 are connected to each other, and the nonmagnetic member mounting portions 28 form the original shape of the inner core 14a. At the same time, it is molded simultaneously by the mold. In addition, although the part which protrudes in the circumferential direction from each teeth 23 is provided in the circumferential direction both sides on both sides of this nonmagnetic member mounting part 28, this site | part becomes the teeth bridge 27 finally. Next, as shown in FIGS. 5B and 6, a resin 26 is injection-molded on the nonmagnetic member mounting portion 28. For this reason, the resin 26 is bound in the nonmagnetic member mounting portion 28.

A stator coil 16 is wound around the original shape of the inner core 14a thus formed as shown in FIG. The stator coil 16 is inserted from the outer peripheral side of the inner core 14a, and coils for six phases are wound in adjacent six slots 15 by wave winding as distributed winding. Moreover, since the width of each slot 15 is only a width that allows one coil to be inserted as described above, the coils are inserted in a row in the radial direction. In the present embodiment, the stator coil 16 is wound so that five coils are inserted.

  Next, as shown in FIG. 8 (a), the outer core 14b is fitted into the outer periphery of the inner core 14a from the axial direction by press fitting so that the teeth 23 of the inner core 14a are fixed in the recess 24 of the outer core 14b. As shown in FIG. 8B, the inner core 14a and the outer core 14b are integrated. In addition, since it is easier to form a magnetic path if the inner core 14a and the outer core 14b are in close contact with each other without a gap, it is preferable that the outer core 14b be slightly deformed during press-fitting.

  The stator core 14 manufactured in this manner is in a state where the teeth 23 are connected to each other on the inner periphery of the inner core 14a, but the connecting portion is removed by cutting as shown in FIG. For this reason, the inner periphery of each tooth is connected by the remaining resin 26.

  Although the first embodiment has been described above, the operational effects of the first embodiment will be described below.

  According to Example 1, an inner core constituted by a plurality of independent teeth made of a magnetic material so that a plurality of slots opened on the outer circumferential side are formed in the circumferential direction, and disposed on the outer circumferential side of the inner core, The outer core which forms a magnetic path around a slot, the stator coil periodically wound in a slot, and the nonmagnetic member which connects the adjacent teeth in an inner core on the inner peripheral side are provided. For this reason, since the stator coil can be inserted from the outer peripheral side without being inserted from the inner peripheral side of each of the narrow teeth, the space factor of the stator coil in the slot in the stator can be improved. Further, since the magnetic path is hardly formed on the inner peripheral side of each tooth by the nonmagnetic member, the magnetic path can be surely formed from the rotor to the outer core.

  Moreover, according to Example 1, the nonmagnetic member was a nonconductive material. For this reason, an eddy current is not generated in the nonmagnetic member, and heat generation due to the generation of the eddy current can be prevented. Specifically, the non-conductive material was a resin. Further, when a thermoplastic resin is used for this resin, the heat conductivity is better than that using a thermosetting resin, and the heat is easily transferred between the teeth. Further, when a thermosetting resin is used, it hardens as the stator coil and the stator core generate heat, so that the strength as the inner core is improved.

  Moreover, according to Example 1, the tooth bridge is provided at the end portion on the inner peripheral side of the teeth so as to protrude on both sides in the circumferential direction, and the nonmagnetic member is configured to connect adjacent tooth bridges. Yes. For this reason, a magnetic path can be easily configured with the rotor.

  Moreover, according to Example 1, the nonmagnetic member is provided in the whole range of the axial direction of the inner core in teeth. For this reason, the connection strength between the teeth is improved.

  Further, according to the first embodiment, the nonmagnetic member is provided at substantially the same position in the radial direction of the inner core with respect to the inner peripheral side surface of the tooth, so that the gap with the rotor is reduced as much as possible. As a result, the magnetic path can be easily configured. Further, if the inner peripheral surface of the inner core is formed into a continuous cylindrical shape and the teeth and the nonmagnetic members are alternately arranged in the circumferential direction, the inner core can be brought closer to the rotor.

  Further, according to the first embodiment, the outer core is formed in an annular shape, and the inner core is mounted on the inner peripheral side, so that the outer core can be configured in a simple manner. In addition, if the number of teeth is formed on the inner peripheral side of the outer core and the outer periphery of each tooth can be mounted in the recess, the teeth and the recess come into contact with each other on three surfaces. The magnetic flux between the outer core and the inner core, which is constituted by another member, can be easily transferred, and the teeth can be prevented from swinging with respect to the outer core.

  Further, the stator coil of Example 1 is wound in a line in the radial direction in the slot, and the circumferential widths of the slot and the tooth are substantially the same. That is, since the slot and the tooth have substantially the same width as the cross-sectional width of the stator coil, a large number of slots and teeth having a very narrow width are formed. Here, if the stator coil can be wound in many rows like concentrated winding, it is possible to increase the circumferential width of one tooth and firmly bond the outer peripheral portion of the tooth and the outer core. In the present embodiment, since the width of the teeth cannot be increased, the outer peripheral portion of the teeth and the outer core cannot be firmly bonded. For this reason, it becomes more meaningful to interpose resin in the inner periphery of the teeth.

  Moreover, although the stator core of Example 1 is used for the AC generator, in that case, the power generation efficiency is improved.

  In addition, the stator core of the first embodiment includes a step of integrally molding an inner core configured in an annular shape so that the slots are opened on the outer peripheral side of the teeth and the teeth are connected to each other on the inner peripheral side, A step of forming a nonmagnetic member on the outer peripheral side of the portion where each tooth is connected on the inner peripheral side of the inner core, a step of periodically winding a stator coil in the slot, and an annular shape made of a magnetic material The outer core was manufactured by attaching and fixing the outer core to the outer periphery of the inner core, and cutting the inner periphery of the inner core to the position of the nonmagnetic member. For this reason, when attaching a stator coil to an inner core, or attaching an inner core to an outer core, it can prevent that a joint location of a nonmagnetic member and teeth will break. This is particularly effective when the inner core and the outer core are fixed by press-fitting.

  Further, according to the first embodiment, the concave nonmagnetic member mounting portion is formed on the outer peripheral side of the portion where each tooth is connected on the inner peripheral side of the inner core before cutting, and the nonmagnetic member mounting portion is non-coated. The magnetic member was filled and cutting was performed until the nonmagnetic member appeared from the bottom of the nonmagnetic member mounting portion. For this reason, it is easy to attach the nonmagnetic member to the nonmagnetic member mounting portion as much as necessary, and the tooth bridge can be easily formed by simply cutting from the bottom of the nonmagnetic member mounting portion until the nonmagnetic member appears. In particular, when a resin material as a nonmagnetic member is injection molded in a mold, it is effective to provide a nonmagnetic member mounting portion.

  Moreover, according to Example 1, since the inner core and the outer core were comprised with the powder magnetic core, a complicated shape can be easily formed, and an insulating film is applied on the surface of the magnetic powder. Can also be suppressed.

  Moreover, according to Example 1, since the outer core was press-fitted into the inner core to such an extent that the outer core was slightly deformed, the magnetic path can be surely formed in what is constituted by another member.

  As described above, the first embodiment has been described using the automotive AC generator as the rotating electrical machine, but is not limited to the generator and can be applied to a motor.

  Moreover, in Example 1, although the recessed part where the teeth of an inner core are inserted is formed in the inner periphery of an outer core, even if there is no recessed part, it is possible to fix each other.

  In the first embodiment, the stator coil has a circular cross section, but the cross section may be polygonal. In particular, the space factor of the stator coil in the slot can be improved by making the cross section into a quadrilateral shape.

  Moreover, in Example 1, although the inner core and the outer core were comprised with the dust core, it is also possible to comprise by the laminated steel plate laminated | stacked in the state which each surface insulated. In this case, the strength of each part can be improved with respect to the dust core.

  Moreover, although Example 1 demonstrated what used resin as a nonmagnetic member, in addition to resin, electroconductive nonmagnetic metals, such as aluminum and stainless steel, can also be used, for example. In this case, since the thermal conductivity is better than that of the resin, the temperature of the teeth can be averaged. For this reason, heat dissipation efficiency improves.

  In the first embodiment, the nonmagnetic member is provided in the concave nonmagnetic member mounting portion. However, the nonmagnetic member may be simply provided on the inner peripheral bottom between the teeth without providing the nonmagnetic member mounting portion. In this case, since the tooth bridge cannot be provided, it is necessary to set the circumferential width of the teeth wider so that the magnetic path from the rotor can be transmitted.

  In the first embodiment, the inner core and the outer core are fixed by press-fitting, but may be fixed by another method such as welding.

  Next, a stator according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 10 is an enlarged view of the slot portion of the stator of the second embodiment as a cross section. In addition, about the site | part which is common in Example 1, it represents with the same name and the same code | symbol.

  In the first embodiment, the resin 26 as the non-magnetic member is merely provided on the circumferential front end surface of the tooth bridge 27. However, in the second embodiment, the resin 26 is disposed on the inner peripheral side and the outer peripheral side of the tooth bridge 27. It is extended and provided. More specifically, the inner peripheral side and the outer peripheral side of the tip end surface in the circumferential direction of the teeth bridge 27 are provided with recesses, and the resin 26 enters the recesses.

  Thus, in Example 2, since the resin 26 extends and is provided on the inner peripheral side and the outer peripheral side of the tooth bridge 27, each tooth 23 can be prevented from relatively moving in the radial direction. The binding between the teeth 23 and the resin 26 can be strengthened.

  Next, a stator according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 11 is an enlarged view of the slot portion of the stator of the third embodiment as a cross section. In addition, about the site | part which is common in another Example, it represents with the same name and the same code | symbol.

  In the second embodiment, the resin 26 is provided so as to extend to the inner peripheral side and the outer peripheral side of the teeth bridge 27. However, in the third embodiment, a recess is also provided at a substantially central position in the radial direction of the teeth bridge 27. Yes. That is, unevenness is formed on the circumferential front end surface of the teeth bridge 27, and the resin 26 enters the respective recesses.

  Thus, in Example 3, since the unevenness | corrugation is provided in the circumferential direction front end surface of the teeth bridge 27 and the resin 26 has entered into the recessed part, each of the teeth 23 and the resin 26 is further further than in Example 2. The binding can be made strong.

  Next, a stator according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is an enlarged view of the slot portion of the stator of the fourth embodiment as a cross section. In addition, about the site | part which is common in another Example, it represents with the same name and the same code | symbol.

In the first embodiment, the periphery of the stator coil 16 in the slot 15 is wound with insulating paper 25 to insulate the inner core 14a and outer core 14b from the stator coil 16, but in the fourth embodiment, between the teeth 23. The provided resin 26 as a nonmagnetic material is continuously formed on the inner peripheral surface of the slot 15, and the resin 26 is also formed between the recesses 24 corresponding to the slots 15 in the outer core 14 b.

  For this reason, in Example 4, the stator coil 16 can be insulated from the stator core 14 without providing the insulating paper 25, and the strength of the inner core 14a can be improved.

It is side surface sectional drawing of the whole structure of the alternating current generator for motor vehicles as a rotary electric machine. It is a perspective view of the stator of Example 1 by which the stator coil was wound. It is the figure which expanded the slot part of the stator of Example 1 as a cross section. It is a perspective view of the inner core and outer core in the stator of Example 1. FIG. 6 is a diagram illustrating a method for manufacturing the inner core of Example 1. FIG. 1 is a perspective view of an manufactured inner core in Example 1. FIG. It is a perspective view of the state where the stator coil was wound around the inner core in Example 1. It is the figure explaining the fixing method of the inner core and outer core in Example 1. FIG. FIG. 4 is a cross-sectional view of a finally manufactured stator core of Example 1. It is the figure which expanded the slot part of the stator of Example 2 as a cross section. It is the figure which expanded the slot part of the stator of Example 3 as a cross section. It is the figure which expanded the slot part of the stator of Example 4 as a cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 14 ... Stator core, 14a ... Inner core, 14b ... Outer core, 15 ... Slot, 16 ... Stator coil, 22 ... Stator, 23 ... Teeth, 24 ... Recess, 26 ... Resin (nonmagnetic member), 27 ... Teeth bridge, 28 ... nonmagnetic member mounting part.

Claims (20)

A stator of a rotating electrical machine on which a coil is wound,
An inner core constituted by a plurality of independent teeth made of a magnetic material so that a plurality of slots opened on the outer circumferential side are formed in the circumferential direction;
An outer core disposed on the outer peripheral side of the inner core and forming a magnetic path around the slot;
A stator coil periodically wound in the slot;
A nonmagnetic member for connecting adjacent teeth on the inner core on the inner peripheral side;
A stator for a rotating electrical machine, comprising: In claim 1,
The stator of a rotating electrical machine, wherein the nonmagnetic member is a nonconductive material. In claim 2,
The stator of a rotating electrical machine, wherein the nonmagnetic member is made of a resin material. In claim 3,
The stator for a rotating electrical machine, wherein the resin material is a thermoplastic resin. In claim 3,
The stator of a rotating electrical machine, wherein the resin material is a thermosetting resin. In claim 1,
A tooth bridge is provided at an end on the inner peripheral side of the teeth so as to protrude on both sides in the circumferential direction, and the nonmagnetic member connects adjacent tooth bridges to each other. . In claim 6,
The stator of a rotating electrical machine, wherein the nonmagnetic member is provided to extend to an inner peripheral side and an outer peripheral side of the teeth bridge. In claim 6,
A stator for a rotating electrical machine, wherein unevenness is formed at a circumferential tip of the tooth bridge. In claim 1,
The stator of a rotating electrical machine, wherein the nonmagnetic member is provided in an entire range of the teeth in the axial direction of the inner core. In claim 1,
The stator of a rotating electrical machine, wherein the nonmagnetic member is provided at substantially the same position in the radial direction of the inner core or on the outer peripheral side with respect to the inner peripheral side surface of the teeth. In claim 10,
The inner peripheral surface of the inner core has a continuous cylindrical shape, and the teeth and the nonmagnetic members are alternately arranged in the circumferential direction. In claim 1,
The stator of a rotating electrical machine, wherein the nonmagnetic member is continuously formed on a surface in the slot from an inner peripheral side of the teeth. In claim 1,
The outer core is formed in an annular shape, and the inner core is mounted on the inner peripheral side. In claim 13,
A stator for a rotating electrical machine, wherein recesses are formed on the inner peripheral side of the outer core by the number of teeth, and the outer periphery of each tooth is mounted in the recesses. In claim 1,
The stator coil is a stator of a rotating electrical machine, wherein the stator coil is wound in a row in a radial direction in the slot, and the circumferential width of the slot and the teeth is substantially the same. An AC generator that generates electricity by rotating a rotor,
A drive shaft that is rotationally driven by a drive source;
A rotor made of a magnetic material that rotates integrally with the drive shaft;
A field coil provided in the rotor and alternately forming a plurality of different magnetic poles in the circumferential direction of the rotor by supplying a current from a non-rotating portion via a slip ring;
An inner core constituted by a plurality of independent teeth made of a magnetic material so that a plurality of slots opened on the outer circumferential side are formed in the circumferential direction;
An outer core disposed on the outer peripheral side of the inner core and forming a magnetic path around the slot;
A stator coil periodically wound in the slot;
A non-magnetic member that is provided on the inner peripheral side of each tooth in the inner core and that prevents the magnetic flux from moving to the inner peripheral side with respect to the outer core.
An alternator characterized by comprising: A stator coil manufacturing method in which a stator coil is periodically wound in a slot formed between teeth formed of a plurality of magnetic bodies,
A step of integrally molding an inner core configured in an annular shape so that a slot is opened on the outer peripheral side of the teeth and the teeth are connected to each other on the inner peripheral side;
Forming a nonmagnetic member on the outer peripheral side of the portion to which each of the teeth is connected at least on the inner peripheral side of the inner core;
Periodically winding the stator coil in the slot;
Attaching and fixing an outer core formed in a ring shape with a magnetic body to the outer periphery of the inner core;
Cutting the inner peripheral side of the inner core to the position of the non-magnetic member;
A method of manufacturing a stator for a rotating electrical machine, characterized in that In claim 15,
A concave nonmagnetic member mounting portion is formed on the outer peripheral side of the portion where the teeth are connected on the inner peripheral side of the inner core before cutting, and the nonmagnetic member mounting portion is filled with the nonmagnetic member. A method of manufacturing a stator for a rotating electrical machine, wherein cutting is performed from the bottom of the nonmagnetic member mounting portion until the nonmagnetic member appears. In claim 15,
The method of manufacturing a stator of a rotating electrical machine, wherein the nonmagnetic member is made of a resin material, and the resin material is injection-molded on the inner core. In claim 15,
A method of manufacturing a stator of a rotating electrical machine, wherein the outer core is fixed to the inner core by press-fitting.

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