JP2008312366A - Rotating electric machine and its core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress variation in relative position of core segments in the axial direction of a rotating electric machine, and to equalize the clamping force of each core segment. <P>SOLUTION: A stator core 12 has a plurality of core segments 18 split in the circumferential direction of a rotating electric machine, and a substantially cylindrical clamping member 20 for clamping the plurality of core segments 18 by tightening them from the outer circumferential side. A plurality of protrusions 32 protruding radially inward of the rotating electric machine are arranged on the clamping member 20 along the circumferential direction of the rotating electric machine with a gap therebetween. Each of the plurality of protrusions 32 has a surface 32a abutting against one end face 18a of each core segment 18 in the axial direction of the rotating electric machine, and thereby each core segment 18 is positioned in the axial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine and its core, in particular, a plurality of core divided pieces divided in the circumferential direction, and a fastening member that fastens the core divided pieces together by tightening the plurality of core divided pieces from the outer peripheral side, And a rotary electric machine including the core.

  The related art which comprises a core of a rotating electrical machine by combining a plurality of core division pieces is disclosed in Patent Document 1 below. In Patent Document 1, a plurality of core division pieces divided in the circumferential direction are press-fitted into a cylindrical housing (fastening member), and the plurality of core division pieces are fastened and tightened from the outer peripheral side by the housing. Yes.

  In addition, a rotating electrical machine according to Patent Document 2 below is disclosed.

JP 2004-328965 A JP-A-9-182359

  When a plurality of core divided pieces divided in the circumferential direction are fastened and tightened from the outer peripheral side by a fastening member, if the relative position of each core divided piece varies in the axial direction of the rotating electrical machine, the magnetic resistance of the core increases. In addition, the performance of the rotating electrical machine is likely to deteriorate, such as a decrease in output of the rotating electrical machine.

  In order to suppress variation in the relative position of each core segment in the axial direction of the rotating electrical machine, a positioning member for positioning the core segment in the axial direction by contacting the end surface of each core segment in the axial direction It is also conceivable to provide the fastening member. However, in that case, in the fastening member, the rigidity of the portion where the positioning member is provided is higher than the other portions, and the core split piece is tightened between the portion where the positioning member is provided and the other portions. The power is different. As a result, the fastening force of each core split piece by the fastening member becomes non-uniform.

  An object of this invention is to suppress the dispersion | variation in the relative position of each core division piece regarding the axial direction of a rotary electric machine, and to equalize | tighten the clamping force of each core division piece.

  The rotating electrical machine and its core according to the present invention employ the following means in order to achieve the above-described object.

  The core of the rotating electrical machine according to the present invention includes a plurality of core division pieces divided in the circumferential direction, and a rotation member that fastens the plurality of core division pieces from the outer peripheral side to fasten the core division pieces. A positioning member for positioning each core segment in the axial direction by contacting an end surface of each core segment in the axial direction of the rotating electrical machine is provided on the fastening member. The gist includes a plurality of protrusions protruding inward in the radial direction so as to come into contact with an end face of the core split piece, and including a plurality of protrusions arranged at intervals with respect to the circumferential direction. .

  The core of the rotating electrical machine according to the present invention includes a plurality of core divided pieces divided in the circumferential direction, and a fastening member that fastens the core divided pieces together by fastening the plurality of core divided pieces from the outer peripheral side. A positioning member for positioning each core segment in the axial direction by contacting the end surface of each core segment in the axial direction of the rotating electrical machine is attached to the fastening member. The gist is that the positioning member is attached to the fastening member in a state in which relative displacement between the fastening member and the positioning member in the radial direction of the rotating electrical machine is allowed.

  The core of the rotating electrical machine according to the present invention includes a plurality of core divided pieces divided in the circumferential direction, and a fastening member that fastens the core divided pieces together by fastening the plurality of core divided pieces from the outer peripheral side. A positioning member for positioning each core segment in the axial direction by contacting the end surface of each core segment in the axial direction of the rotating electrical machine is attached to the fastening member. The gist of the positioning member is attached to the fastening member at the outer periphery thereof.

  Moreover, the rotating electrical machine which concerns on this invention is a rotating electrical machine provided with a rotor and the stator core which surrounds the outer periphery of a rotor, Comprising: It makes it a summary that a stator core is a core which concerns on this invention.

  According to the present invention, it is possible to suppress variation in the relative position of each core segment in the axial direction of the rotating electrical machine and to uniformize the tightening force of each core segment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

“Embodiment 1”
1-5 is a figure which shows schematic structure of the rotary electric machine provided with the core which concerns on Embodiment 1 of this invention, and shows the case where this invention is applied to the stator core 12 of a rotary electric machine. FIG. 1 shows an outline of the internal configuration of the rotor 14 and the stator (stator core 12) viewed from the axial direction of the rotating electrical machine, FIG. 2 shows an overview of the configuration of the stator core 12 viewed from the axial direction of the rotating electrical machine, and FIG. 4 shows an outline of the internal configuration of the stator core 12 viewed from a direction orthogonal to the axial direction of the rotating electrical machine, FIG. 4 shows an overview of the configuration of the fastening member 20 viewed from the axial direction of the rotating electrical machine, and FIG. The outline of the internal structure of the fastening member 20 seen from the direction orthogonal to a direction is shown. The rotating electrical machine according to the first embodiment includes a rotor 14 and a stator (stator core 12) that surrounds the outer periphery of the rotor 14 and is fixed to a casing (not shown). The rotor 14 and the stator are perpendicular to the axial direction of the rotating electrical machine. That is, it is a radial type rotating electrical machine that is disposed to face in the radial direction.

  The rotor 14 is rotatable about its central axis (coincident with the axis of the rotating electrical machine). In the stator core 12, a plurality of teeth 30 projecting toward the rotor 14 (inner radial direction of the rotating electrical machine) are arranged at intervals from each other along the circumferential direction of the rotating electrical machine (rotating direction of the rotor 14). A coil 16 is disposed on the tooth 30. In FIG. 1, illustration of a specific configuration of the rotor 14 is omitted, but a configuration in which a permanent magnet is disposed on the rotor 14 to obtain magnet torque, or a salient pole is formed on the rotor 14 to generate reluctance torque. Various configurations such as a configuration to be obtained can be adopted.

  The stator core 12 includes a plurality of core division pieces 18 divided in the circumferential direction of the rotating electrical machine, and a substantially cylindrical fastening member 20 that fastens the core division pieces 18 by fastening the plurality of core division pieces 18 from the outer peripheral side. And comprising. When the core split pieces 18 are fastened together by the fastening member 20, the core split pieces 18 are fitted into the fastening member 20 in contact with the inner peripheral surface 20 a by shrink fitting or press fitting, so that each core is fitted. The split piece 18 is fastened from the outer peripheral side by the fastening member 20. 1 to 3 show an example in which the stator core 12 is divided into a plurality of core division pieces 18 in units of teeth 30, but the stator core 12 may not necessarily be divided in units of teeth 30. Moreover, about each core division | segmentation piece 18, it can also form by laminating | stacking a thin silicon steel plate (electromagnetic steel plate) in the axial direction of a rotary electric machine, for example, and can also shape | mold with a powder magnetic core material. The dust core material here is a material obtained by compacting a powder coated with a film that does not conduct electricity on the surface of fine particles of ferromagnetic material such as iron.

  In the present embodiment, the rotating electrical machine is used as a positioning member for positioning each core split piece 18 in the axial direction at one end portion of the fastening member 20 in the axial direction of the rotating electrical machine (in the rotational center axis direction of the rotor 14). A plurality of projecting portions 32 projecting radially inward are provided. The plurality of protrusions 32 are arranged at intervals along the circumferential direction of the rotating electrical machine, and a gap 33 is formed between the protrusions 32 adjacent in the circumferential direction. The plurality of projecting portions 32 projecting inward in the radial direction come into contact with one end surface 18a of each core segment 18 in the axial direction of the rotating electrical machine at the abutting surface 32a, thereby each core segment 18 in this axial direction. Perform positioning. Here, the plurality of projecting portions 32 are formed such that the contact surfaces 32a with the core segment 18 are located on the same plane. In addition, about the number of the protrusion parts 32 provided in the fastening member 20, it can set arbitrarily. For example, the protrusions 32 can be provided for each of the core division pieces 18, the plurality of protrusions 32 can be brought into contact with the common core division piece 18, or the protrusions common to the plurality of core division pieces 18 The part 32 can also be brought into contact. Further, the protrusion 32 can be integrated with the fastening member 20, or can be attached to the fastening member 20 separately from the fastening member 20 with an attachment member such as a bolt.

  As described above, in the present embodiment, the plurality of protrusions 32 provided on the fastening member 20 are brought into contact with the one end face 18a of each core split piece 18 to thereby position each core split piece 18 in the axial direction of the rotating electrical machine. And the variation in the relative position of each core segment 18 in the axial direction can be suppressed.

  Furthermore, in this embodiment, since the some protrusion part 32 provided in the fastening member 20 is arrange | positioned at intervals with respect to the circumferential direction of a rotary electric machine, the some protrusion part 32 is rigidity regarding the radial direction of the fastening member 20. As shown in FIG. Hardly contribute. Therefore, in the fastening member 20, the rigidity in the radial direction of the one end portion where the protruding portion 32 is provided is substantially equal to the rigidity in the radial direction of the other portion (the portion where the protruding portion 32 is not provided). Therefore, when the plurality of core divided pieces 18 are fitted into the fastening member 20 by press-fitting, the amount of deformation of the fastening member 20 toward the radially outer side at one end provided with the protruding portion 32 and the other portion. Are substantially equal, and the clamping force (compressive stress) of the core segment 18 is also substantially equal. Further, when the plurality of core divided pieces 18 are fitted inside the fastening member 20 by shrink fitting, the shrinkage of the fastening member 20 to the inside in the radial direction is performed at one end portion where the protruding portion 32 is provided and the other portion. The amount is substantially equal, and the fastening force (compressive stress) of the core split piece 18 is also substantially equal. Therefore, the fastening force of each core segment 18 by the fastening member 20 can be made uniform in the axial direction of the rotating electrical machine.

  As described above, according to the present embodiment, it is possible to suppress variation in the relative position of each core segment 18 in the axial direction of the rotating electrical machine and to uniformize the tightening force of each core segment 18. . As a result, the magnetic resistance of the stator core 12 can be reduced, and the performance of the rotating electrical machine can be improved, such as an increase in the output of the rotating electrical machine.

“Embodiment 2”
6-8 is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 2 of this invention. 6 shows an outline of the configuration of the stator core 12 as seen from the axial direction of the rotating electrical machine, FIG. 7 shows an outline of the internal configuration of the stator core 12 as seen from the direction orthogonal to the axial direction of the rotating electrical machine, and FIG. The outline of the structure of the fastening member 20 seen from the axial line direction is shown. In the following description of the second embodiment, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  In the present embodiment, an annular positioning plate 42 is attached to one end of the fastening member 20 in the axial direction of the rotating electrical machine as a positioning member for positioning each core split piece 18 in the axial direction. The positioning plate 42 abuts at one end surface 18a of each core segment 18 in the axial direction of the rotating electrical machine and the abutting surface 42a, thereby positioning each core segment 18 in this axial direction. Here, the contact surface 42a of the positioning plate 42 is formed in a planar shape.

  A plurality of elongated holes 44 are formed in the positioning plate 42 at intervals with respect to the circumferential direction of the rotating electrical machine, and the longitudinal direction of each elongated hole 44 coincides with the radial direction of the rotating electrical machine. The positioning plate 42 is attached to the fastening member 20 by a plurality of bolts (attachment members) 46 that pass through the long holes 44. As a result, when the radial force acting on the fastening member 20 is larger than the predetermined value F0, the bolt 46 slides along the longitudinal direction of the elongated hole 44 and is positioned with the fastening member 20 in the radial direction of the rotating electrical machine. A relative displacement with respect to the plate 42 is allowed. The predetermined value F0 here is a value that allows the fastening member 20 to slide in the radial direction with respect to the positioning plate 42 when the plurality of core division pieces 18 are fitted inside the fastening member 20 by shrink fitting or press fitting. Set to Here, the predetermined value F0 can be adjusted by adjusting the fastening force between the fastening member 20 and the positioning plate 42 by the bolt 46. The number of the long holes 44 provided in the positioning plate 42 can be arbitrarily set. Further, the positioning plate 42 can be attached to the fastening member 20 by using a pin instead of the bolt 46.

  In the present embodiment, the positioning plate 42 does not hinder the deformation of the fastening member 20 in the radial direction of the rotating electrical machine. For example, when a plurality of core division pieces 18 are fitted inside the fastening member 20 by press-fitting, one end portion of the fastening member 20 to which the positioning plate 42 is attached is deformed relative to the positioning plate 42 radially outward. Is acceptable. Therefore, the amount of deformation of the fastening member 20 in the radial direction is substantially equal at one end where the positioning plate 42 is attached and the other portion, and the tightening force (compressive stress) of the core split piece 18 is also approximately equal. Further, when the plurality of core divided pieces 18 are fitted inside the fastening member 20 by shrink fitting, one end portion of the fastening member 20 to which the positioning plate 42 is attached is relative to the positioning plate 42 radially inward. Shrinkage is allowed. Therefore, the amount of shrinkage of the fastening member 20 radially inward is substantially equal at one end where the positioning plate 42 is attached and the other portion, and the tightening force (compressive stress) of the core split piece 18 is also approximately equal. Therefore, the fastening force of each core segment 18 by the fastening member 20 can be made uniform in the axial direction of the rotating electrical machine.

  As described above, in the present embodiment as well as in the first embodiment, it is possible to suppress variations in the relative position of each core segment 18 in the axial direction of the rotating electrical machine and to equalize the tightening force of each core segment 18. can do.

“Embodiment 3”
9 and 10 are diagrams showing a schematic configuration of a rotating electrical machine including a core according to Embodiment 3 of the present invention. FIG. 9 shows an outline of the configuration of the stator core 12 as seen from the axial direction of the rotating electrical machine, and FIG. 10 shows an outline of the internal configuration of the stator core 12 as seen from a direction orthogonal to the axial direction of the rotating electrical machine. In the following description of the third embodiment, the same or corresponding components as those of the first and second embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, an annular positioning ring 52 is attached to one end portion of the fastening member 20 in the axial direction of the rotating electrical machine as a positioning member for positioning each core split piece 18 in the axial direction. The positioning ring 52 is capable of positioning each core segment 18 in the axial direction by contacting the end surface 18a of each core segment 18 in the axial direction of the rotating electrical machine with the contact surface 52a. Here, the contact surface 52a of the positioning ring 52 is formed in a planar shape.

  A screw 38 is provided on the outer peripheral surface 20 b of the fastening member 20, and a screw 48 is provided on the inner peripheral surface 52 b of the positioning ring 52. And the positioning ring 52 is attached to the fastening member 20 by the outer peripheral surface 20b by the fastening of the screws 38 and 48. Here, in addition to screw fastening, the positioning ring 52 can be attached to the outer peripheral surface 20b of the fastening member 20, for example, by press fitting.

  In the present embodiment, the positioning ring 52 does not prevent the fastening member 20 from contracting in the radial direction of the rotating electrical machine. For example, when a plurality of core division pieces 18 are fitted inside the fastening member 20 by shrink fitting, one end portion of the fastening member 20 to which the positioning ring 52 is attached is relative to the positioning ring 52 radially inward. Shrinkage is allowed. Therefore, the amount of shrinkage of the fastening member 20 radially inward is substantially equal at one end where the positioning ring 52 is attached and the other portion, and the tightening force (compression stress) of the core split piece 18 is also approximately equal. Therefore, the fastening force of each core segment 18 by the fastening member 20 can be made uniform in the axial direction of the rotating electrical machine.

  As described above, in this embodiment as well as Embodiments 1 and 2, it is possible to suppress variation in the relative position of each core segment 18 in the axial direction of the rotating electrical machine and to reduce the tightening force of each core segment 18. It can be made uniform.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 1. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 1. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 1. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 1. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 1. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 2. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 2. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 2. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 3. FIG. It is a figure which shows schematic structure of a rotary electric machine provided with the core which concerns on Embodiment 3. FIG.

Explanation of symbols

  12 stator cores, 14 rotors, 16 coils, 18 core split pieces, 20 fastening members, 30 teeth, 32 protrusions, 38, 48 screws, 42 positioning plates, 44 oblong holes, 46 bolts, 52 positioning rings.

Claims (4)

A core of a rotating electrical machine comprising: a plurality of core division pieces divided in the circumferential direction; and a fastening member that fastens the core division pieces by fastening the plurality of core division pieces from the outer periphery side,
The fastening member is provided with a positioning member that positions each core divided piece in the axial direction by contacting the end face of each core divided piece in the axial direction of the rotating electrical machine.
The positioning member includes a plurality of projecting portions projecting radially inward so as to come into contact with an end surface of the core split piece, and the projecting portions include a plurality of projecting portions spaced from each other with respect to the circumferential direction. core. A core of a rotating electrical machine comprising: a plurality of core division pieces divided in the circumferential direction; and a fastening member that fastens the core division pieces by fastening the plurality of core division pieces from the outer periphery side,
The fastening member is attached with a positioning member that positions each core divided piece in the axial direction by contacting the end surface of each core divided piece in the axial direction of the rotating electrical machine,
The positioning member is a core of the rotating electrical machine that is attached to the fastening member in a state in which relative displacement between the fastening member and the positioning member in the radial direction of the rotating electrical machine is allowed. A core of a rotating electrical machine comprising: a plurality of core division pieces divided in the circumferential direction; and a fastening member that fastens the core division pieces by fastening the plurality of core division pieces from the outer periphery side,
The fastening member is attached with a positioning member that positions each core divided piece in the axial direction by contacting the end surface of each core divided piece in the axial direction of the rotating electrical machine,
The positioning member is a core of the rotating electrical machine that is attached to the fastening member at the outer periphery thereof. A rotating electrical machine comprising a rotor and a stator core surrounding the outer periphery of the rotor,
A rotating electrical machine, wherein the stator core is the core according to any one of claims 1 to 3.

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