JP2015198558A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double rotor type rotary electric machine that prevents deviation of a coil from a rotor and that reduces a rotary torque change due to a magnetic flux generated by the rotor.SOLUTION: The inner rotor 101 of a rotary electric machine 100 comprises: an inner core 11; a rotor coil 12 wound around the inner core 11; and insulators 13, 14 interposed between the inner core 11 and rotor coil 12. The inner core 11 has a plurality of teeth 11b circumferentially arranged on the inner periphery side thereof so as to be spaced from one another and projecting radially inwards. Spaces between the teeth 11b are filled with the belt-like projections 2c of an inside rotary shaft 2. The insulators 13, 14 have coil external parts 13b, 14b so as to surround a coil end 12a from radially outside the inner core 11, the coil external wall parts 13b, 14b projecting by an amount of projection beyond the coil end 12a of the rotor coil 12 from the end parts 11e, 11f of the inner core 11.

Description

  The present invention relates to a rotary electric machine, and more particularly to a double rotor type rotary electric machine.

  For example, Patent Document 1 discloses a double rotor type rotating electrical machine including a stator, an outer rotor that is rotatably accommodated in the stator, and an inner rotor that is rotatably accommodated in the outer rotor. Have been described. The stator is formed with a plurality of stator teeth extending toward the outer peripheral surface of the outer rotor. Further, a three-phase winding for generating magnetic flux is wound around the stator teeth by distributed winding. A permanent magnet is embedded in the outer rotor. The inner rotor is formed with a plurality of rotor teeth extending toward the outer rotor. Furthermore, a three-phase winding for generating magnetic flux is wound around the rotor teeth in a distributed manner.

JP 2013-162613 A

  In the rotating electrical machine described in Patent Document 1, the three-phase winding wound around the inner rotor forms a coil end protruding from the end of the inner rotor. When the inner rotor rotates at a high speed, the coil end deforms and expands due to centrifugal force, and contacts with the components on the outer peripheral side of the inner rotor, causing an electrical short circuit. Further, slots are formed between the plurality of rotor teeth on the outer periphery of the inner rotor, and the three-phase winding wound around the inner rotor escapes from these slots by centrifugal force. There is also a problem. In addition, since the slot is open to the outer periphery of the inner rotor, the magnetic flux generated from the three-phase winding becomes discontinuous on the outer peripheral side, resulting in fluctuations in the rotational torque that rotates the outer rotor, that is, torque ripple There is also a problem that arises.

  The present invention has been made in order to solve the above-described problems, and is a double rotor type that prevents the winding from escaping from the rotor and reduces fluctuations in rotational torque due to magnetic flux generated from the rotor. An object of the present invention is to provide a rotating electrical machine.

  In order to solve the above-described problems, a rotating electrical machine according to the present invention is provided on an inner rotor, an outer rotor provided to be relatively rotatable radially outside the inner rotor, and a radially outer side of the outer rotor. In a rotating electrical machine including a stator, a coil is wound around at least one of an inner rotor and an outer rotor, and a rotor around which the coil is wound includes a cylindrical core formed of a magnetic material, and a core And an insulator formed of a material having electrical insulation and provided to be interposed between the core and the coil, and the core includes an inner peripheral side and an outer peripheral side. On the other hand, it has a plurality of teeth that protrude radially in the radial direction of the core and are arranged side by side along the circumferential direction of the core, and the gap between the teeth is a protrusion of the teeth On the end side, it is blocked by a magnetic material different from the core, Yl is wound around the tooth portion of the core, the insulator has a wall portion projecting in protrusion amount above the coil from the end of the cylindrical axis direction of the core has to surround the coil from outside in the radial direction of the core.

The tooth portion may protrude toward the radially inner side of the core.
The magnetic body may be composed of a plurality of members that individually close the gaps between the tooth portions.
Or a magnetic body may consist of a single cylindrical member which plugs up all the gaps between tooth parts.
The coil may be wound around the inner rotor, and the magnetic body may be a protrusion that individually closes the gap between the tooth portions and is provided on the rotation shaft of the inner rotor.
The wall portion of the insulator may be provided so as not to protrude in the cylindrical axis direction of the core from the stator.

  According to the rotating electrical machine according to the present invention, it is possible to prevent the winding from escaping from the rotor and to reduce fluctuations in the rotational torque due to the magnetic flux generated from the rotor.

It is a typical section side view showing the composition of the rotary electric machine concerning Embodiment 1 of this invention. It is a disassembled perspective view of the inner rotor of FIG. It is a perspective view after the assembly of the inner rotor of FIG. It is the figure which looked at the cross-sectional side view which passes along the axial center of the inner side rotating shaft in the inner rotor of FIG. 3 from the IV-IV direction. It is the figure which looked at sectional drawing perpendicular | vertical to the inner side rotating shaft in the inner rotor of FIG. 3 from the VV direction. FIG. 6 is a cross-sectional view showing a modified example of the inner rotor of the rotating electrical machine according to the first embodiment of the present invention, similar to FIG. 5. It is sectional drawing which shows the inner rotor of the rotary electric machine which concerns on Embodiment 2 of this invention similarly to FIG. It is sectional drawing which shows the inner rotor of the rotary electric machine which concerns on Embodiment 3 of this invention similarly to FIG. It is a cross-sectional side view which shows the modification of an insulator similarly to FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
First, the configuration of the rotary electric machine 100 according to Embodiment 1 of the present invention will be described.

  Referring to FIG. 1, a rotating electrical machine 100 that is a double rotor type motor includes a housing 1 that includes an inner rotary shaft 2, a cylindrical inner rotor 101, a cylindrical outer rotor 20, and a cylindrical stator 30. Have. The inner rotating shaft 2 is made of a magnetic material such as metal. Here, the inner rotor 101 constitutes an inner rotor, the outer rotor 20 constitutes an outer rotor, and the stator 30 constitutes a stator.

The inner rotor 101 is provided on the outer peripheral surface 2a of the inner rotary shaft 2 so as to rotate integrally.
The inner rotor 101 includes a cylindrical inner core 11 provided so as to surround and rotate integrally with the outer peripheral surface 2 a of the inner rotary shaft 2, and a rotor embedded in an annular shape along the circumferential direction inside the inner core 11. And a coil 12. The inner core 11 is a laminate in which a plurality of layers made of a magnetic material such as metal are laminated in the cylindrical axis direction.

The outer rotor 20 is provided so as to surround the outer periphery of the inner rotor 101 in the radial direction with a space therebetween. The outer rotor 20 can rotate relative to the inner rotor 101.
The outer rotor 20 has a cylindrical outer core 21 that surrounds the outer periphery of the inner rotor 101 and is coaxially provided on the inner rotary shaft 2, and a circumferential surface that faces the inner rotor 101 in the vicinity of the inner peripheral surface of the outer core 21. A plurality of first permanent magnets 22 embedded in a ring shape along the direction, and a plurality of second permanent magnets 23 embedded in a ring shape along the circumferential direction in the vicinity of the outer peripheral surface of the outer core 21. The outer core 21 is made of a magnetic material such as metal.

The outer core 21 is sandwiched and supported at both ends by substantially bottomed cylindrical rotor brackets 24 and 25 that enclose the outer periphery of the inner rotary shaft 2 and the inner rotor 101. Each of the rotor brackets 24 and 25 is rotatably supported by the outer peripheral surface 2a of the inner rotary shaft 2. The rotor brackets 24 and 25 can relatively rotate on the inner rotary shaft 2 together with the outer core 21.
A cylindrical outer rotary shaft 3 that projects so as to surround the outer periphery of the inner rotary shaft 2 is integrally formed on the bottomed portion of the rotor bracket 25. The outer rotating shaft 3 constitutes a rotating shaft that rotates integrally with the outer rotor 20.

The stator 30 is provided so as to surround the outer periphery of the outer rotor 20 in the radial direction with a space therebetween.
The stator 30 has a cylindrical stator core 31 that surrounds the outer periphery of the outer core 21 of the outer rotor 20 and is fixed to the housing 1, and an annular shape in the circumferential direction so as to face the outer core 21 inside the stator core 31. And an embedded stator coil 32. The stator core 31 is made of a magnetic material such as metal.

  A slip ring 4 is attached to an end 2b of the inner rotary shaft 2 opposite to the outer rotary shaft 3 so as to rotate integrally. The slip ring 4 is electrically connected to an external electric device via a brush, and can supply and demand alternating current. The slip ring 4 is electrically connected to the rotor coil 12 of the inner rotor 101 via a conductor 5 that passes through the inside of the inner rotary shaft 2.

Furthermore, the detailed configuration of the inner rotor 101 will be described with reference to FIGS.
Referring to FIGS. 2 and 3 together, the inner rotor 101 includes a cylindrical inner core 11 made of a magnetic material, and a first and a first attached to the inner core 11 that are made of an electrically insulating material. Two insulators 13 and 14, and a rotor coil 12 wound around an inner core 11 to which the insulators 13 and 14 are attached and composed of three-phase windings. As a material for forming the insulators 13 and 14, a resin such as polybutylene terephthalate, a liquid crystal polymer, or polyphenylene sulfide can be used.

  The inner core 11 includes a cylindrical outer peripheral wall portion 11a and a plurality of teeth 11b formed to project from the inner peripheral surface of the outer peripheral wall portion 11a along the radial direction toward the axial center of the outer peripheral wall portion 11a. doing. The teeth 11b are integrally formed with the outer peripheral wall portion 11a and extend along the axial direction of the outer peripheral wall portion 11a. A cross section of the tooth 11b perpendicular to the axial direction of the outer peripheral wall portion 11a has a T-shape that spreads on the axial center side. That is, each tooth 11b protrudes from the outer peripheral wall portion 11a and extends in the circumferential direction at the tip of the web portion 11ba and the plate-like web portion 11ba extending along the axial direction of the outer peripheral wall portion 11a. It is comprised by the flange part 11bb. The plurality of teeth 11b are annularly arranged so as to be arranged at equal intervals along the inner periphery of the outer peripheral wall portion 11a. The flange portion 11bb of each tooth 11b forms a cylindrical inner peripheral surface 11c aligned with the outer peripheral surface 2a of the inner rotary shaft 2 as a whole. Here, the teeth 11 b constitute the teeth of the inner core 11.

Between the flange portions 11bb of the teeth 11b, a slit 11d extending along the axial direction of the outer peripheral wall portion 11a is formed. A coil housing space 11bc is formed on the outer peripheral side of the flange portion 11bb between the teeth 11b. A cross section perpendicular to the axial direction of the outer peripheral wall portion 11a in the coil housing space 11bc is substantially trapezoidal.
Further, both end portions 11e and 11f in the axial direction of the inner core 11 are formed by the outer peripheral wall portion 11a and the plurality of teeth 11b.

The first and second insulators 13 and 14 have the same shape.
The first insulator 13 includes an annular plate-like end plate 13a having substantially the same shape as the end portion 11e of the inner core 11, and a cylinder projecting from the outer peripheral edge of the end plate 13a in a direction perpendicular to the end plate 13a. A coil-shaped outer wall portion 13b and a plurality of cylindrical portions 13c protruding from the end plate 13a in the opposite direction to the outer coil wall portion 13b are integrally formed.

  The plurality of cylindrical portions 13c are disposed so as to be aligned with the plurality of coil housing spaces 11bc of the inner core 11, and have a length that is half the axial length of the inner core 11. Each cylindrical portion 13c has a shape that matches each coil housing space 11bc, and fits closely when inserted into each coil housing space 11bc. Each cylinder part 13c opens by opening part 13aa which penetrates the edge part plate 13a. Further, each cylindrical portion 13c is formed with a slit 13ca that aligns with and communicates with the slit 11d when the cylindrical portion 13c is inserted into the coil housing space 11bc along the axial direction. In addition, the end plate 13a is formed with a plurality of slits 13ab that align with and communicate with the end of the slit 11d when the cylindrical portion 13c is inserted into the coil housing space 11bc. It is connected to the opening 13aa and each slit 13ca.

Further, the second insulator 14 is also constituted by an end plate 14 a, a coil outer wall portion 14 b, and a plurality of cylindrical portions 14 c in the same manner as the first insulator 13.
A plurality of band-like protrusions 2 c extending along the axial direction are integrally formed on the outer peripheral surface 2 a of the inner rotary shaft 2. The plurality of band-like protrusions 2 c are formed at positions corresponding to the slits 11 d of the inner core 11. Here, the belt-like protrusion 2c constitutes a magnetic body.

Therefore, the inner core 11 is assembled and attached to the inner rotary shaft 2 as described below.
As shown in FIGS. 2 and 4, each cylindrical portion 14 c of the second insulator 14 is placed in each coil accommodating space of the inner core 11 until the end plate 14 a of the second insulator 14 abuts on the end portion 11 f of the inner core 11. Insert into 11bc. Further, each cylindrical portion 13c of the first insulator 13 is inserted into each coil housing space 11bc of the inner core 11 until the end plate 13a of the first insulator 13 contacts the end portion 11e of the inner core 11. At this time, as shown in FIG. 4, the tip of the cylinder portion 13 c and the cylinder portion 14 c are in contact with each other, and the first insulator 13 and the second insulator 14 are connected to the entire wall surface and end of each coil housing space 11 bc of the inner core 11. It extends over the parts 11e and 11f. Furthermore, the slits 13ca and 14ca are at positions that match the slit 11d of the inner core 11.

Next, as shown in FIGS. 2 to 5, the three-phase winding is wound with concentrated winding, distributed winding, or the like over all the teeth 11 b of the inner core 11 to form the rotor coil 12.
The winding is wound from above the first insulator 13 and the second insulator 14 around the web portion 11ba of each tooth 11b through the slit 11d. At this time, the first insulator 13 and the second insulator 14 are interposed between the winding and the inner core 11. The winding is located in the coil housing space 11bc and protrudes from the end plates 13a and 14a. As shown in FIG. 4, the coil outer wall portions 13b and 14b of the first insulator 13 and the second insulator 14 with respect to the coil end 12a of the rotor coil 12 formed by the windings protruding from the end plates 13a and 14a are: In the axial direction of the inner core 11, it protrudes from the end plates 13 a and 14 a more than equivalently, and surrounds the cylindrical coil end 12 a from the outer side in the radial direction of the inner core 11. That is, the coil outer wall portions 13b and 14b have a height equal to or greater than that of the coil end 12a and are surrounded from the outside.
Further, referring to FIG. 1, the positions of the coil outer wall portions 13 b and 14 b in the direction perpendicular to the inner rotation shaft 2 of the axial end portions 13 ba and 14 ba are respectively on the inner rotation shaft 2 of the axial end portion of the stator 30. It is formed so as not to protrude from the position in the vertical direction. In the present embodiment, the axial end portion of the stator 30 is the axial end portion 32aa of the coil end 32a of the stator coil 32. This configuration is for preventing an increase in the size of the rotary electric machine 100 in the direction of the inner rotary shaft 2.

Further, as shown in FIGS. 2, 3 and 5, the inner rotary shaft 2 is inserted inside the inner peripheral surface 11c of the inner core 11 assembled as described above and wound with the rotor coil 12. The At the time of insertion, each band-like protrusion 2 c of the inner rotary shaft 2 is fitted into each slit 11 d of the inner core 11. As a result, each band-shaped protrusion 2c fills each slit 11d, and the periphery of each coil housing space 11bc is surrounded without interruption by the member having magnetism by the inner core 11 and the band-shaped protrusion 2c.
As a result, the attachment of the inner rotary shaft 2 to the inner core 11 is completed.

Next, the operation of the rotary electric machine 100 according to Embodiment 1 of the present invention will be described.
Referring to FIGS. 1, 4, and 5 together, when a three-phase alternating current is supplied to the rotor coil 12 of the inner rotor 101 via the slip ring 4, a rotating magnetic field is generated from the rotor coil 12. This rotating magnetic field forms a loop-shaped magnetic flux surrounding each coil housing space 11 bc inside the inner core 11. Since each slit 11d of the inner core 11 is filled with the band-shaped protrusion 2c made of a magnetic material, the loop-shaped magnetic flux has a uniform magnetic flux intensity without bias. A uniformly distributed magnetic flux with little bias is formed.

The magnetic flux of the inner core 11 acts on the first permanent magnet 22 of the outer rotor 20 to give a rotational torque, and rotates the outer rotor 20 relative to the inner rotor 101.
In addition, since the outer rotor 20 side portion of the inner core 11 is formed by the outer peripheral wall portion 11a that smoothly continues in the circumferential direction, the outer rotor 20 is given a smoothly continuous rotational torque without torque ripple. It is done.

  Further, when the inner rotor 101 is not supplied with a three-phase alternating current and is rotated by applying an external force to the inner rotary shaft 2, the inner rotor 101 has the magnetic flux formed by the first permanent magnet 22 of the inner rotor 101. As the rotor coil 12 moves, an induced current that is a three-phase alternating current is generated in the rotor coil 12. The generated induced current can be taken out through the slip ring 4.

  When the inner rotor 101 rotates, the rotor coil 12 is subjected to a centrifugal force radially outward. Even if the coil end 12a projecting from the inner core 11 is deformed radially outward by this centrifugal force, the coil outer wall portions 13b and 14b of the insulators 13 and 14 surrounding the coil end 12a from the radially outer side are the coil end 12a. Prevents deformation and spread of Furthermore, since the coil outer wall portions 13b and 14b have a height higher than the coil end 12a, the coil end 12a is reliably prevented from being deformed and spread.

Further, when a three-phase alternating current is supplied to the stator coil 32 of the stator 30, the rotating magnetic field generated from the stator coil 32 acts on the second permanent magnet 23 of the outer rotor 20, and the outer rotating shaft 3 together with the outer rotor 20. Rotate.
On the other hand, when an external force is applied to the outer rotary shaft 3 without being supplied with the three-phase alternating current to the stator 30, the magnetic flux formed by the second permanent magnet 23 and the first permanent magnet 22 of the outer rotor 20 rotates. As a result, an induced current that is a three-phase alternating current is generated in the stator coil 32 and the rotor coil 12. The generated induced current is extracted from the stator coil 32 and the rotor coil 12 to the outside.

  As described above, the inner rotor 101 of the rotary electric machine 100 according to the first embodiment of the present invention includes the cylindrical inner core 11 formed of a magnetic material, the rotor coil 12 wound around the inner core 11, and the electric And insulators 13 and 14 which are formed of a material having a typical insulating property and are provided so as to be interposed between the inner core 11 and the rotor coil 12. The inner core 11 has a plurality of teeth 11b that protrude radially in the radial direction of the inner core 11 and are arranged side by side along the circumferential direction on the inner peripheral side thereof. The gap between the teeth 11b is closed by the belt-like protrusion 2c of the inner rotary shaft 2 on the protruding end side of the tooth 11b. The insulators 13 and 14 include coil outer wall portions 13b and 14 that protrude from the end portions 11e and 11f of the inner core 11 with a protruding amount that is greater than or equal to the coil end 12a of the rotor coil 12 wound around the teeth 11b. So as to surround from the outside in the radial direction of the inner core 11.

  At this time, the coil outer wall portions 13 b and 14 b of the insulators 13 and 14 can prevent the coil end 12 a that receives centrifugal force when the inner rotor 101 rotates from spreading outward in the radial direction. And since the coil outer wall parts 13b and 14b protrude beyond the coil end 12a, the expansion of the coil end 12a can be prevented effectively. Further, since the band-shaped protrusion 2c closes the gap between the teeth 11b, the coil housing space 11bc between the teeth 11b is surrounded by a magnetic member. Therefore, the rotating magnetic field generated from the rotor coil 12 is generated in the magnetic member. A strong magnetic flux in a loop shape surrounding the coil housing space 11bc can be formed. Thereby, the rotational torque which acts on the outer rotor 20 increases. Furthermore, since there is no intermittent member having magnetism on the tip side of the tooth 11b, it is possible to suppress the occurrence of fluctuations in torque (torque ripple) due to a change in magnetic flux on the tip side of the tooth 11b.

Further, in the inner rotor 101 of the rotating electrical machine 100, the teeth 11 b protrude toward the radially inner side of the inner core 11. As a result, when the inner rotor 101 rotates, the rotor coil 12 receives a centrifugal force to the side opposite to the opening side of the gap between the teeth 11b, so that the escape of the rotor coil 12 from this gap can be reliably prevented. it can.
Further, in the rotary electric machine 100, the plurality of band-like protrusions 2c of the inner rotary shaft 2 individually close the gaps between the teeth 11b of the inner core 11. As a result, the gap between the teeth 11b can be closed with the magnetic material only by attaching the inner core 11 to the inner rotary shaft 2.
Further, in the inner rotor 101 of the rotating electrical machine 100, the coil outer wall portions 13 b and 14 b of the insulators 13 and 14 are provided so as not to protrude in the cylindrical axis direction of the inner core 11 from the stator 30. Thereby, the increase in the length in the axial direction of the inner side rotating shaft 2 of the rotary electric machine 100 can be suppressed.

  Further, in the inner rotor 101 in the rotating electrical machine 100 according to the first embodiment, the slit 11d between the teeth 11b of the inner core 11 is filled with the belt-like protrusion 2c of the inner rotating shaft 2, but this is not limitative. Instead, the inner rotary shaft 2 may be filled with another member. As shown in FIG. 6, each slit 11d may be individually filled with a strip-like magnetic member 15 having a cross section along the same radial direction as the flange portion 11bb of the tooth 11b and made of a magnetic material. For example, an electromagnetic steel plate can be used as the magnetic member 15. Alternatively, a liquid magnetic material may be poured into the slit 11d and solidified.

Embodiment 2. FIG.
In the rotating electrical machine according to the second embodiment of the present invention, the inner rotor 101 of the rotating electrical machine 100 according to the first embodiment is configured such that a magnetic member is buried between the teeth 11b of the inner core 11. A cylindrical ring made of a magnetic material is provided on the inner peripheral side of the inner core 11.
In the following embodiments, the same reference numerals as those in the previous drawings are the same or similar components, and thus detailed description thereof is omitted.

Referring to FIG. 7, the inner rotor 201 of the rotating electrical machine according to the second embodiment includes an inner core 211, insulators 13 and 14 similar to the inner rotor 101 of the first embodiment, and the rotor coil 12. .
The inner core 211 includes a cylindrical outer peripheral wall portion 211a and a plurality of tooth portions 211b formed to project from the inner peripheral surface of the outer peripheral wall portion 211a along the radial direction toward the axial center of the outer peripheral wall portion 211a. Have. The tooth part 211b is integrally formed with the outer peripheral wall part 211a and has a plate-like shape extending along the axial direction of the outer peripheral wall part 211a. The plurality of tooth portions 211b are annularly arranged so as to be arranged at equal intervals along the inner periphery of the outer peripheral wall portion 211a.

  The insulators 13 and 14 are attached to the inner core 211 such that the respective cylindrical portions 13c and 14c are inserted into a trapezoidal columnar coil housing recess 211bc formed between the tooth portions 211b of the inner core 211. The cylindrical portions 13c and 14c have an outer shape that matches the coil housing recess 211bc.

With respect to the inner core 211 to which the insulators 13 and 14 are attached, three-phase windings are wound around all the tooth portions 211b to form the rotor coil 12, and after this formation, the inner sides of the plurality of tooth portions 211b A cylindrical magnetic ring 215 is inserted into the magnetic field. The magnetic ring 215 is made of a magnetic material. The inserted magnetic ring 215 is in total contact with the radially inner end surface 211ba of all the tooth portions 211b, and closes the coil housing recess 211bc between the tooth portions 211b on the distal end side of the tooth portion 211b. Thereby, the circumference | surroundings of each coil accommodation recessed part 211bc are surrounded by the member which has the magnetism by the inner core 211 and the magnetic ring 215 seamlessly. And the magnetic flux which generate | occur | produces from the rotor coil 12 forms the loop-shaped magnetic flux surrounding each coil accommodation recessed part 211bc in the member which has magnetism.
Moreover, since the other structure and operation | movement of the rotary electric machine which concern on Embodiment 2 of this invention are the same as that of Embodiment 1, description is abbreviate | omitted.

And according to the rotary electric machine which concerns on Embodiment 2 of this invention, the effect similar to the rotary electric machine 100 of Embodiment 1 is acquired.
Further, in the inner rotor 201 of the rotating electrical machine according to the second embodiment of the present invention, the single magnetic ring 215 is all the open end of the coil housing recess 211bc that is the gap between the teeth 211b of the inner core 211. Block. This simplifies the structure of closing the gap between the tooth portions 211b with a member having magnetism, and facilitates the assembly of this structure.

Embodiment 3 FIG.
In the rotating electrical machine according to Embodiment 3 of the present invention, what is provided in the inner rotor 101 of the rotating electrical machine 100 according to Embodiment 1 so as to protrude the teeth 11b of the inner core 11 toward the radially inner side is provided. It is provided so as to protrude outward in the radial direction.

Referring to FIG. 8, the inner rotor 301 of the rotating electrical machine according to the third embodiment includes an inner core 311, insulators 313 and 314, and a rotor coil 12.
The inner core 211 has a cylindrical inner peripheral wall portion 311a and a plurality of teeth 311b integrally formed so as to protrude radially outward from the outer peripheral surface of the inner peripheral wall portion 311a. Each tooth 311b has a T-shaped cross section, and has a plate-like web portion 311ba extending so as to protrude along the axial direction of the inner peripheral wall portion 311a, and a circumferential direction at the tip of the web portion 311ba. The flange portion 311bb extends so as to expand. The plurality of teeth 311b are annularly arranged so as to be arranged at equal intervals along the outer periphery of the inner peripheral wall portion 311a. As a whole, the flange portion 11bb forms an outer peripheral surface 311g of the inner core 311.

  A slit 311d is formed between the flange portions 311bb of the teeth 311b. A trapezoidal columnar coil housing space 311bc is formed on the inner peripheral side of the flange portion 311bb between the teeth 311b.

The insulators 313 and 314 have the same shape.
Each of the insulators 313 and 314 includes cylindrical portions 313c and 314c having an outer shape matching the coil housing space 311bc, an end plate (not shown), and a coil outer wall portion (not shown), and the insulator 13 according to the first embodiment. And 14 have substantially the same configuration. However, the cylindrical portion 313c of the first insulator 313 and the cylindrical portion 314c of the second insulator 314 are formed with slits 313ca and 314ca extending along the axial direction not on the radially inner side but on the radially outer side. The slits 313ca and 314ca are arranged so that their positions coincide with the slit 311d of the inner core 311 when the insulators 313 and 314 are attached to the inner core 311.

  After the insulators 313 and 314 are attached to the inner core 311 so that the respective cylindrical portions 313c and 314c are inserted into the coil housing space 311bc, three-phase windings are wound around all the teeth 311b of the inner core 311. The rotor coil 12 is formed by being rotated, and strip-like magnetic members 315 are individually embedded in the slits 311d between the flange portions 311bb of the teeth 311b. The magnetic member 315 is made of a magnetic material and can be, for example, an electromagnetic steel plate. Alternatively, the magnetic member 315 may be solidified by pouring a liquid magnetic material into the slit 311d. The magnetic member 315 prevents the rotor coil 12 from escaping from the slit 311d when the inner rotor 301 rotates.

The magnetic member 315 has a cross section along the same radial direction as the flange portion 311bb of the tooth 311b, and forms a cylindrical outer peripheral surface 311g together with the flange portion 311bb. Thereby, the circumference | surroundings of each coil accommodation space 311bc are surrounded by the member which has the magnetism by the inner core 311 and the magnetic member 315 seamlessly. And the magnetic flux which generate | occur | produces from the rotor coil 12 forms the loop-shaped magnetic flux surrounding each coil accommodation space 311bc in the member which has magnetism.
Moreover, since the other structure and operation | movement of the rotary electric machine which concern on Embodiment 3 of this invention are the same as that of Embodiment 1, description is abbreviate | omitted.

And according to the rotary electric machine which concerns on Embodiment 3 of this invention, the effect similar to the rotary electric machine 100 of Embodiment 1 is acquired.
Further, in the inner rotor 301 of the rotating electrical machine of the third embodiment, as in the second embodiment, each tooth 311b is formed as a plate-like tooth portion so as to surround the outer periphery of all the tooth portions instead of the magnetic member 315. A magnetic ring may be provided.

  In the inner rotor of the rotating electrical machine of the first to third embodiments, the coil outer wall portion for preventing the spread of the coil is formed integrally with the insulator on the radially outer side of the coil end 12a. You may provide a wall part also inside radial direction. For example, as shown in FIG. 9, cylindrical coil inner wall portions 13d and 14d integrally formed with the insulators 13 and 14, respectively, are provided on the radially inner side of the coil end 12a at a height equal to or higher than the coil end 12a. Also good. Thereby, even if the coil end 12a is deformed by centrifugal force or the like, the coil end 12a is prevented from spreading not only radially outward but also radially inward.

In the inner rotor of the rotating electrical machine according to the first to third embodiments, the cylindrical portions 13c and 313c of the insulators 13 and 313 and the cylindrical portions 14c and 314c of the insulators 14 and 314 have the same length. However, it is not limited to this, and they may be different from each other. When attached to the inner cores 11, 211, 311, the total length of the cylinder portions facing each other is such that all the cylinder portions 13c, 313c facing each other and the cylinder portions 14c, 314c come into contact with each other. What is necessary is just to correspond with the axial direction length of the core 11,211,311.
Further, in the rotating electrical machines of the first to third embodiments, the rotor coils 12 are provided in the inner rotors 101 to 301. However, even when the outer rotor 20 is provided with the rotor coils, the description is given in the first to third embodiments. The configuration of the insulator, the configuration of the magnetic member, and the configuration of the magnetic ring can be applied.

  2 Inner rotating shaft, 2c Band-shaped protrusion (magnetic material), 3 Outer rotating shaft, 101, 201, 301 Inner rotor (inner rotor), 11, 211, 311 Inner core, 11e, 11f End (end of core) 11b, 311b Teeth (tooth portion), 211b Tooth portion, 12 Rotor coil, 12a Coil end, 13, 14, 313, 314 Insulator, 13b, 14b Coil outer wall portion, 15, 315 Magnetic member (magnetic body), 215 Magnetic Ring (magnetic material), 20 outer rotor (outer rotor), 30 stator (stator), 32 stator coil, 32aa end (end of stator), 100 rotating electric machine.

Claims (6)

In a rotating electrical machine including an inner rotor, an outer rotor provided so as to be relatively rotatable on a radially outer side of the inner rotor, and a stator provided on a radially outer side of the outer rotor,
A coil is wound around at least one of the inner rotor and the outer rotor,
The rotor around which the coil is wound is
A cylindrical core formed from a magnetic material;
The coil wound around the core;
An insulator formed of a material having electrical insulation, and provided to be interposed between the core and the coil;
The core has, on one of an inner peripheral side and an outer peripheral side, a plurality of teeth that protrude radially in the radial direction of the core and are arranged side by side along the circumferential direction of the core. And
The gap between the tooth portions is blocked by a magnetic material different from the core on the protruding end side of the tooth portions,
The coil is wound around the teeth of the core;
The insulator has a rotating electrical machine having a wall portion projecting from the end portion of the core in the cylindrical axis direction with a projecting amount larger than the coil so as to surround the coil from the outside in the radial direction of the core.   The rotating electrical machine according to claim 1, wherein the tooth portion protrudes radially inward of the core.   The rotating electrical machine according to claim 1, wherein the magnetic body includes a plurality of members that individually close gaps between the tooth portions.   The rotating electrical machine according to claim 1, wherein the magnetic body is a single cylindrical member that closes all gaps between the tooth portions. The coil is wound around the inner rotor,
The rotating electrical machine according to claim 2, wherein the magnetic body is a protrusion that individually closes a gap between the tooth portions and is provided on a rotation shaft of the inner rotor.   The rotating electrical machine according to any one of claims 1 to 5, wherein the wall portion of the insulator is provided so as not to protrude in a cylindrical axis direction of the core from the stator.

Images