JP2006311637A - Stator of dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a dynamo-electric machine, having a mounting and fixing structure which can surely fix a powder compacting core formed of a power pressed material. <P>SOLUTION: The stator for a dynamo-electric machine comprises an annular stator core 10 which is formed by performing the compression heating molding of a magnetic compacting powder material and is arranged with a plurality of teeth 13 wound with a coil winding wire and a bolt-like member 15, which is formed of a member greater than the magnetic compacting powder in intensity and has a male screw part 15a, which is embedded in the stator core 10 and is fitted with a nut 16 for arranging and fixing the stator core 10. The bolt-like member 15 is arranged at a position at which the flow of magnetic flux generated in the stator core 10 is not prevented. The stator core 10 is formed by bringing a core member 11, having a back yoke part 14 equipped with the teeth 13 and the bolt-like member 15 into contact with the back yoke part 14 and arranging them in a plurality of numbers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator for a rotating electrical machine in which a stator core is formed of a dust material.

  Conventionally, the stator core of an electric motor is formed by a laminated core obtained by laminating electromagnetic steel plates such as silicon steel plates in the rotation axis direction, and compresses a mixture of ferromagnetic powder such as iron alloy powder and ferrite powder and an insulating binder. It is known to form a sintered or compression-molded powder core.

As an electric motor having such a stator, for example, there is a “flat motor stator” (see Patent Document 1), and a base iron core on which windings are arranged is manufactured using a soft magnetic steel powder metal molding material.
JP 2004-274971 A

However, in the conventional “flat motor stator” (see Patent Document 1), the dust core (magnetic pole iron core) of the stator is inserted into the screw hole formed in the end face on the root side of the dust core, and the dust back yoke ( It was fixed by screwing screws from the back of the base iron core). For this reason, in the case of a motor with a large torque, there is a risk that the screw will lick the screw hole formed in the dust core due to vibration during rotation, etc. If the screw hole is licked, it will not be possible to screw it. The stator core cannot be fixed.
The objective of this invention is providing the stator of the rotary electric machine which has the attachment fixing structure which can fix the dust core formed of the dust material reliably.

  In order to achieve the above object, a stator of a rotating electrical machine according to the present invention is formed by compressing and heating a magnetic powder compact, and an annular shape in which a plurality of teeth portions around which coil windings are wound are arranged. A stator core and a fastened portion formed by a member having a strength higher than that of the magnetic compact, and embedded in the stator core, to which a fastening member for arranging and fixing the stator core is mounted. And a fastened portion forming member.

  According to the present invention, the annular stator core having a plurality of teeth portions around which the coil winding is wound is formed by compressing and heat-molding the magnetic compact, and embedded in the stator core. The fastened portion forming member having the fastened portion to which the fastening member for arranging and fixing the stator core is mounted is formed of a member having a strength higher than that of the magnetic compacted material. It can have the attachment fixation structure which can fix the formed powder core reliably.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1A and 1B show a part of a stator of a rotating electrical machine according to an embodiment of the present invention, in which FIG. 1A is a cross-sectional view seen from the radial inner side of the stator core, and FIG. FIG. As shown in FIG. 1, a stator core (stator core) 10 forming a stator of a rotating electrical machine has a plurality of (three shown) core members 11 around a rotary electric rotating shaft (not shown). It is formed in a line on the inner surface side of the case 12 so as to be positioned in an annular shape (see (a)).

  Each core member 11 has a tooth portion 13 and a back yoke portion 14 at the lower end (contact end with the case 12) of the tooth portion 13, and is arranged in contact with each other so that the back yoke portions 14 are in close contact with each other. ing. The back yoke portion 14 protrudes by the same amount on both sides in the arrangement direction of the core members 11 so as to be stepped with respect to the teeth portion 13, and the inner side of the stator core 10 in the radial direction (stator core radial direction) is narrow and the outer side is wide. It is formed in a shape (see (a)). Coil windings (not shown) are wound around the cylindrical teeth portions 13.

  The core member 11 is formed by compression heating molding using a magnetic powder compact, and is a bolt-shaped member (embedded and integrally formed in the core member 11 at the time of core compression heating molding). Fastened to the case 12 by a fastened portion forming member 15.

  The bolt-shaped member 15 has a male screw portion 15a at the upper end of the male screw portion (fastened portion) 15a when viewed from the circumferential direction of the stator core 10 (the circumferential direction of the stator core; see the white arrow in (a)). Are formed in a T-shape having a head (embedded portion) 15b arranged orthogonally (see (b)). The head portion 15b is formed of a triangular prism having a chevron-shaped cross section having a bottom surface wider than the upper end surface of the male screw portion 15a, and the male screw portion 15a protrudes from substantially the center of the lower end surface of the back yoke portion 14 in the stator core radial direction Are embedded in the back yoke portion 14 (see (a) and (b)).

  The head portion 15 b embedded in the back yoke portion 14 is disposed at a position that does not hinder the flow of magnetic flux generated in the core member 11. For example, the path width of the magnetic flux excluding the head portion 15 b of the core member 11 (that is, the distance from the boundary portion between the tooth portion 13 and the back yoke portion 14 to the head portion 15 b) D is determined from the height d of the back yoke portion 14. By making it narrow (D ≧ d), the head 15b can be arranged at a position that does not hinder the flow of magnetic flux (see (a)).

  The bolt-shaped member 15 is a member having at least a head portion 15b (buried portion) that is a non-magnetic material and has a strength higher than that of the magnetic powder compact that forms the core member 11, that is, generated when the rotating electrical machine rotates. Even when a rotational torque is applied, it is formed of a member that can maintain its shape, such as resin or metal.

  When attaching the core member 11 to the case 12, the male screw portion 15 a passes through the hole 12 a formed in the case 12 and protrudes to the outside of the case 12, and the male screw portion 15 a protruding to the outside of the case 12 has a nut (fastening member). ) 16 is mounted (only one is shown, see (a)). The core member 11 is positioned and fixed to the case 12 by the nut 16 being screwed onto the male screw portion 15a and being in a fastened state. That is, the bolt-shaped member 15 has a male screw portion 15a that is formed integrally with the head portion 15b, is exposed from the back yoke portion 14, and is screwed with the nut 16.

  As described above, the bolt-shaped member 15 for fixing the stator core 10 to the case 12 has at least a head portion 15b that is a non-magnetic body and has a strength higher than that of the magnetic powder compact that forms the core member 11. It consists of a member, is embedded in the stator core 10 together at the time of core compression heating molding, and is formed integrally with the stator core 10. At this time, the bolt-shaped member 15 is arrange | positioned in the position which does not prevent the flow of the magnetic flux which generate | occur | produces in a stator. As a result, the stator of the rotating electrical machine can have an attachment fixing structure that can reliably fix the stator core (dust core) 11 formed of the dust material to the case 12.

  Further, by making the path width D of the magnetic flux excluding the head portion 15b of the core member 11 smaller than the height d of the back yoke portion 14 (D ≧ d), a sufficient magnetic path width is secured, and the core member 11 is secured. Even if the head portion 15b is embedded in the rotary electric machine, the performance of the rotating electrical machine does not deteriorate. Further, since the head portion 15b of the bolt-shaped member 15 is embedded in the back yoke portion 14 along the radial direction of the stator core, the nut 16 can be obtained even when vibration or the like is applied to the stator core 10. Therefore, it is possible to prevent the stator core 10 from rotating with respect to the male screw portion 15a fixed thereto.

  FIG. 2 is a cross-sectional view similar to FIG. 1B, showing another example of the bolt-shaped member of FIG. As shown in FIG. 2, the bolt-shaped member 20 embedded in the core member 11 has a head portion 20b made of a triangular prism having different chevron cross-section heights in place of the head portion 15b. The action is the same as that of the bolt-shaped member 15.

  The bolt-shaped member 20 has a head portion 20b that has a bottom surface wider than the upper end surface of the male screw portion 15a and is formed of a triangular prism having a mountain-shaped cross section with a different height and an inclined top portion. If the height Ho of the mountain-shaped cross section of the head 20b is formed so that the height Ho on the outer peripheral side of the core member 11 is not lower than the height Hi on the inner peripheral side (Ho ≧ Hi), the inside of the core member 11 through which a large amount of magnetic flux passes. The clearance in the height direction on the circumferential side can be increased, and the passage of magnetic flux is not hindered.

  Further, the distance between each end face of the head 20b and the end face of the tooth portion 13 is the distance Li between the inner peripheral side outer surface of the core member 11 and the inner peripheral side end face of the head 20b, and the outer peripheral side outer surface of the core member 11 And a distance Lo between the outer peripheral side end surfaces of the head 20b (Li> Lo), the gap on the inner peripheral side of the core member 11 through which a large amount of magnetic flux passes can be increased, and the passage of the magnetic flux is not hindered.

  3 shows still another example of the bolt-shaped member of FIG. 1, (a) is a cross-sectional view similar to (a) of FIG. 1, (b) is a cross-sectional view similar to (b) of FIG. (C) is sectional drawing similar to (b). As shown in FIG. 3, the bolt-shaped member 25 has a flange-shaped portion 25 a at the top of the head portion 15 b, and other configurations and operations are the same as those of the bolt-shaped member 15.

  The bolt-shaped member 25 is attached to the top portion of the head portion 15b along the extending direction of the male screw portion 15a, that is, perpendicular to the case 12 which is the installation surface of the core member 11. (See (a) and (b)). The hook-shaped portion 25a is formed in a rectangular shape whose four sides are substantially the same as the length of the head 15b in the radial direction of the stator core (see (b)), and is fitted in a groove formed in the head 15b ( (See (a)). By having this hook-shaped part 25a, the adhering force with the core member 11 (tooth part 13) of the head 15b embedded in the core member 11 which consists of a magnetic body compacting material improves.

  Moreover, you may open the hole 26 (illustrated as four as an example) which penetrates front and back in the bowl-shaped part 25a. By making one or a plurality of holes 26 in the bowl-shaped portion 25a, the fixing force of the head portion 15b embedded in the core member 11 with the core member 11 (tooth portion 13) is further improved.

  4A and 4B show a part of a stator of a rotating electrical machine according to another embodiment of the present invention, in which FIG. 4A is a cross-sectional view seen from the radially inner side of the stator core, and FIG. FIG. As shown in FIG. 4, a nut-like member (fastened portion forming member) 30 is embedded in the core member 11 instead of the bolt-like member 15.

  The nut-like member 30 is formed of a triangular prism having a substantially same outer shape as that of the head portion 15b of the bolt-like member 15, that is, a laterally mounted mountain-shaped cross section, as viewed from the circumferential direction of the stator (see the white arrow in (a)). The back yoke portion 14 is embedded along the radial direction of the stator core so that the bottom surface is flush with the inner surface of the case 12 (see (a) and (b)). The nut-like member 30 is a non-magnetic member and is a member having a strength higher than that of the magnetic compact that forms the core member 11, that is, a member that can maintain its shape even when vibration during rotation is applied. For example, it is formed of resin or metal.

  The nut-like member 30 embedded in the back yoke portion 14 is formed in a so-called cap nut shape having a plurality of female screw portions 30a (two are shown as an example) spaced apart in the radial direction of the stator core. And is disposed at a position that does not hinder the flow of magnetic flux generated in the core member 11. For example, the path width of the magnetic flux excluding the nut-like member 30 of the core member 11 (that is, the distance from the boundary portion between the tooth portion 13 and the back yoke portion 14 to the upper inclined surface of the nut-like member 30) D is set as the back yoke portion. By making it not narrower than the height d of 14 (D ≧ d), the nut-like member 30 can be arranged at a position that does not hinder the flow of magnetic flux (see (a)).

  In addition, the structure which arrange | positions the nut-shaped member 30 in the position which does not prevent the flow of the magnetic flux which generate | occur | produces in the core member 11 is the structure of the magnetic flux which generate | occur | produces in the core member 11 at the time of using the bolt-shaped member 15 (refer FIG. 1). A configuration in which the flow is not hindered can be similarly applied.

  A bolt (not shown) having a male screw portion which is a fastening member is screwed to the female screw portion 30a through a hole 12a formed in the case 12, and the bolt is fixed to the female screw portion 30a, thereby the core. The member 11 is positioned and fixed to the case 12. That is, the nut-like member 30 has a female screw portion 30 a that is embedded in the back yoke portion 14 and into which a bolt is screwed from the hole 12 a that opens on the surface of the back yoke portion 14.

  As described above, the nut-like member 30 for fixing the stator core 10 to the case 12 is a non-magnetic member and is made of a member having a strength higher than that of the magnetic powder compact forming the core member 11, and the core compression. It is embedded in the stator core 10 together at the time of heat forming and formed integrally with the stator core 10. At this time, the nut-like member 30 is disposed at a position that does not hinder the flow of magnetic flux generated in the core member 11. As a result, the stator of the rotating electrical machine can have an attachment fixing structure that can reliably fix the stator core (dust core) 11 formed of the dust material to the case 12.

  As described above, according to the present invention, the annular stator core having a plurality of teeth portions around which the coil winding is wound is formed by compressing and heating the magnetic compacting material. Since the to-be-fastened portion forming member having the to-be-fastened portion to which the fastening member for arranging and fixing the stator core is embedded is formed by a member having a strength higher than that of the magnetic compact material, It is possible to have an attachment fixing structure that can reliably fix the dust core formed of the dust material.

  In the above embodiment, a water channel through which a cooling solvent flows may be formed in the bolt-shaped member 15 and the nut-shaped member 30 embedded in the stator core 11. As a result, the bolt-like member 15 and the nut-like member 30 embedded in the stator core 11 also serve as a water channel, the stator can be cooled without providing a separate water channel, the structure is simplified and the cost is reduced. Reduction is possible.

FIG. 2 shows a part of a stator of a rotating electrical machine according to an embodiment of the present invention, wherein (a) is a cross-sectional view as seen from the radially inner side of the stator core, and (b) is a cross-sectional view as seen from the circumferential direction of the stator. is there. It is sectional drawing similar to (b) of FIG. 1, which shows the other example of the bolt-shaped member of FIG. 1 shows still another example of the bolt-shaped member of FIG. 1, (a) is a sectional view similar to (a) of FIG. 1, (b) is a sectional view similar to (b) of FIG. 1, and (c) is It is sectional drawing similar to (b). A part of stator of the rotary electric machine which concerns on other embodiment of this invention is shown, (a) is sectional drawing seen from stator core radial inside, (b) is sectional drawing seen from the stator circumferential direction It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator core 11 Core member 12 Case 12a, 26 Hole 13 Teeth part 14 Back yoke part 15, 20, 25 Bolt-like member 15a Male thread part 15b, 20b Head part 16, 30 Nut-like member 25a Gutter-like part 30a Female screw Part

Claims (9)

An annular stator core formed by compressing and heat-molding a magnetic powder compact material and arranging a plurality of teeth portions around which coil windings are wound,
A fastened portion forming member having a fastened portion to which a fastening member for arranging and fixing the stator core, which is formed by a member having a strength higher than that of the magnetic powder compact material, is embedded in the stator core. And a stator for a rotating electric machine. The fastened portion forming member is
The stator of the rotating electrical machine according to claim 1, wherein the stator is disposed at a position that does not hinder the flow of magnetic flux generated in the stator core. The stator core is
The stator of the rotating electrical machine according to claim 1 or 2, wherein a core member having a back yoke portion including the teeth portion and the fastened portion forming member is formed by arranging a plurality of the back yoke portions in contact with each other. The fastened portion forming member is
4. The embed portion embedded in the back yoke portion, and a bolt-shaped member formed integrally with the embed portion and exposed from the back yoke portion and having a male screw portion to which the fastening member is screwed. The stator of the described rotating electrical machine. The fastened portion forming member is
The rotating electrical machine according to claim 3, comprising a nut-like member having a female screw portion into which the fastening member is screwed from a screw hole opened on a surface of the back yoke portion, which is an embedded portion embedded in the back yoke portion. Stator.   The stator of the rotating electrical machine according to claim 4 or 5, wherein a passage width D of the magnetic flux excluding the buried portion in the core member is not narrower than a height d of the back yoke portion (D ≧ d).   The buried portion is formed of a triangular prism having a chevron cross section with different heights and inclined at the top, and the height of the chevron cross section is not lower than the core member outer peripheral height Hi (Ho) (Ho) ≧ Hi) The stator of the rotating electric machine according to any one of claims 4 to 6, wherein the stator is formed.   The distance Li between the core member inner peripheral side outer surface of the teeth part and the inner peripheral side end face of the embedded part is larger than the distance Lo between the core member outer peripheral side outer surface of the teeth part and the outer peripheral end face of the embedded part. The stator of the rotating electrical machine according to any one of claims 4 to 7, wherein (Li> Lo) is formed.   The stator for a rotating electrical machine according to any one of claims 4 to 8, further comprising a thin plate-like hook-like portion embedded in the core member at a top portion of the embedded portion.

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