JP4459884B2 - Rotating electric machine stator and rotating electric machine - Google Patents

Description

  The present invention relates to a structure of a stator core of a rotating electric machine, and more particularly to a structure for fixing a laminated stator core to an external structure by shrink fitting, press fitting, or the like.

  Conventionally, as shown in FIG. 9, a split stator core that includes a split yoke portion 100 that is divided by split surfaces that divide the circumferential direction of the ring, and that forms the annular yoke portion by connecting the split yoke portions 100 to each other. The connecting portion of the split yoke portion 100 includes a cutout portion 100g having an end surface that is recessed from the split surface in the inner ring direction and a protrusion 100c having the split surface as an end surface in the outer ring direction. There was what was provided (for example, refer to Patent Document 1).

  According to the above-described conventional technique, a gap is formed in the main magnetic flux region including the cutout portion 100g in the connecting portion of the divided yoke portion 100, and no compressive stress is applied to the gap. Thereby, the iron loss due to the compressive stress in the main magnetic flux region can be reduced.

Japanese Patent Laying-Open No. 2005-51941 (paragraphs [0005] and [0006], FIG. 1)

  However, in the conventional technique, since the area of the contact portion 100a with which the protrusion 100c of the adjacent divided yoke portion 100 contacts is small, the contact portion 100a does not shift when the divided yoke portion 100 is assembled in an annular shape. It takes time to combine them. In addition, even if they are combined well, if an uneven force is applied from the outer periphery, the contact portion 100a is likely to be displaced, so that the position of the tooth tip may be displaced. If variations occur in the position of the tooth tip, the motor characteristics will be adversely affected, such as increased cogging.

  Furthermore, since there is a gap in the magnetic path, it is difficult to avoid an increase in magnetic resistance, and it is difficult to say that a sufficient effect can be obtained by offsetting the effect of reducing the iron loss.

  This invention was made to solve the conventional problems as described above, and when fixing the laminated stator core to the external structure, it is fixed while adopting shrink fitting or press fitting. It is possible to minimize the deterioration of the magnetic properties of the core and to achieve good assembling and assembling accuracy.

A stator core of a rotating electrical machine according to the present invention is a stator core of a rotating electrical machine configured by stacking a plurality of core members, and the stacked core members are fitted to the inner periphery of an external structure. The stator core is configured by combining a yoke portion and a plurality of core members having teeth extending in the inner circumferential direction from the yoke portion, and the yoke portions are combined in an annular shape, and are connected to the external structure. A core member that contributes to fixing to the external structure is composed of a laminated portion of the core member that contributes to fixing and a laminated portion of the core member that does not contribute to fixing to the external structure. In this case, the core member which is composed of the first core member made up of the core member pieces in which the adjacent yoke parts come into contact with each other at the contact part, and the core member which does not contribute to fixing to the external structure has an annular yoke part. In If the combined saw, characterized in that it is constituted by a second core member comprising a core piece having an air gap between the yoke portion adjacent.

According to the present invention, the first core member composed of the core member pieces in which the adjacent yoke portions, which are the laminated portions of the core members contributing to fixation to the external structure, abut at the abutment portion, and the core not contributing to the fixation Since the laminated stator core is constituted by the second core member formed of the core member piece having a gap between the adjacent yoke portions which are the laminated portions of the members, the second core member is fixed to the external structure. For this reason, the compression stress is not transmitted in the circumferential direction, and an increase in iron loss in the main magnetic flux region can be suppressed. On the other hand, the fixing to the external structure is stably performed by the first core member.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is an axial sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention. In FIG. 1, a rotating electrical machine 10 is disposed opposite to a stator core 1, a three-phase concentrated winding 2 wound around a slot of the stator core 1, a stator core 1, and a rotating shaft 9. And a substantially cylindrical external structure 4 on which the stator core 1 is mounted. A magnet mounted on the rotor 3 is not shown.

  The stator core 1 in the present embodiment is configured by laminating core members made of electromagnetic steel sheets or the like in the axial direction of the rotating electrical machine, and includes a laminated portion 1A that contributes to fixation to the external structure 4 and an external portion. The laminated portion 1B does not contribute to fixing to the structure 4. The inner periphery of the outer structure 4 and the outer periphery of the core member of the laminated portion 1A that contributes to fixing to the outer structure 4 are in close contact with each other by shrink fitting or press fitting. A gap 1g exists between the inner periphery of the external structure 4 and the outer periphery of the core member of the laminated portion 1B that does not contribute to fixing to the external structure 4. In the example of FIG. 1, the stator core 1 is divided into three parts in the stacking direction: an upper part (stacking part 1A), a central part (stacking part 1B), and a lower part (stacking part 1A). The outer periphery is in contact with the inner periphery of the external structure 4, but the outer periphery of the core member of the central core laminated portion 1 </ b> B is configured not to contact the inner periphery of the outer structure 4.

  2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. Note that the rotor and the three-phase winding are not shown. FIG. 2 shows the core member 1a of the laminated portion 1A that contributes to fixing to the external structure 4. The core member 1a includes an annular yoke portion 1a-1 and a plurality of teeth portions 1a-2 extending in the inner circumferential direction from the yoke portion 1a-1, and the outer periphery of the yoke portion 1a-1 and the external structure. It fits closely with the inner periphery of the body 4 without a gap. FIG. 3 shows the core member 1b of the laminated portion 1B that does not contribute to fixing to the external structure 4. The core member 1b includes an annular yoke portion 1b-1 and a plurality of teeth portions 1b-2 extending from the yoke portion 1b-1 in the inner circumferential direction. A gap 1 g is provided on the inner periphery of the body 4.

  As described above, in the present embodiment, in the core member 1a of the stacked portion 1A that contributes to fixing to the external structure 4, the outer periphery of the core member is in contact with the inner periphery of the external structure 4. In the core member 1b of the laminated portion 1B that does not contribute to fixing to the external structure 4, a gap 1g is formed between the outer periphery of the core member 1b and the inner periphery of the external structure 4 over 360 degrees in the circumferential direction. You can see that

  Thereby, when the stator core 1 is fitted to the external structure 4 by shrink fitting or press fitting, the core member 1b of the laminated portion 1B that does not contribute to fixing to the external structure 4 is compressed by shrink fitting or press fitting. Since no stress is applied, an increase in iron loss can be suppressed. Further, since there is no need to provide a gap in the magnetic path, there is no increase in magnetic resistance due to the gap. On the other hand, in the laminated portion 1A that contributes to fixation to the external structure 4, the outer periphery of the core member 1a and the inner periphery of the external structure 4 are in close contact with each other, so that the assemblability and assembly accuracy are not impaired.

  The gap 1g between the inner periphery of the outer structure 4 and the outer periphery of the core member 1b of the laminated portion 1B that does not contribute to fixing to the outer structure 4 may be a slight amount, for example, 1 μm or less after shrink fitting or press fitting. If it is free, compressive stress is not applied, but it is desirable to set it to about 50 μm or less, which is relatively easy to manage production.

  Further, when caulking is used for fixing the core member of the stator core 1 in the stacking direction, if the caulking strength is too strong, a part of the compressive stress applied to the stacked portion 1A contributing to fixing to the external structure 4 is caulked. Because there is a risk of being transmitted to the laminated part 1B that does not contribute to fixing through the part, the caulking strength should be weak enough to prevent the lamination from collapsing, or fixing with an adhesive steel plate or insulator integrated molding without using caulking Fixing with resin is desirable.

  In the description of the above embodiment, the core member 1a of the laminated portion 1A of the fixed iron core 1 and the core member 1b of the laminated portion 1B have an annular yoke portion and an undivided shape as shown in FIGS. Some cases are shown. However, as shown in FIGS. 4 and 5, the present embodiment is applied even when the yoke portions 1a-1 and 1b-1 are divided into a plurality of teeth portions 1a-2 and 1b-2. can do.

  Moreover, in the said embodiment, although the laminated part 1A which contributes to fixation to the external structure 4 and the laminated part 1B which does not contribute to fixation were divided and installed in three places in the lamination direction, it was divided into five places. The core member 1a or the core member 1b may be arranged alternately every one to several sheets, and the arrangement is flexible and is not limited to the above example.

  In order to enhance the effect of reducing iron loss, the ratio of the height of the laminated portion 1A that contributes to fixing to the external structure 4 to the total height of the fixed core is 50% or less, preferably 10 to 40%. It is desirable.

Embodiment 2. FIG.
6 (a) to 6 (d) are views showing a core member of a stator core according to Embodiment 2 of the present invention, and each show a cross-sectional view perpendicular to the axis of the rotating electrical machine. The stator core of the present embodiment is configured by combining and laminating a plurality of types of core members shown in FIGS. The other configuration is the same as that of the embodiment, and the rotor and the three-phase winding are not shown in FIG.

  The core member 5A of the stator core shown in FIG. 6A includes a plurality of core member pieces 5a each having a yoke portion 5a-1 and teeth portions 5a-2 extending in the inner circumferential direction from the yoke portion 5a-1. It is configured by combining the yoke portions 5a-1 of the plurality of core member pieces 5a in an annular shape. Here, 5ha represents a contact portion between adjacent yoke portions 5a-1, and 5a-3 represents a crimped portion (a crimped portion with a core member in the stacking direction) provided at a substantially central position of the yoke portion or the teeth portion. Yes.

  The core member 5B of the stator core shown in FIG. 6B includes a plurality of core member pieces 5b each having a yoke portion 5b-1 and a teeth portion 5b-2 extending in the inner circumferential direction from the yoke portion 5b-1. The plurality of core member pieces 5b are configured by combining the yoke portions 5b-1 in an annular shape. Here, 5 gb is a gap provided between adjacent yoke portions 5 b-1, and 5 b-3 is a crimped portion (a crimped portion with a core member in the stacking direction) provided at a substantially central position of the yoke portion or the teeth portion. Represents.

  The core member 5C of the stator core shown in FIG. 6C includes a plurality of core member pieces 5c each having a yoke portion 5c-1 and a teeth portion 5c-2 extending in the inner circumferential direction from the yoke portion 5c-1. The plurality of core member pieces 5c are configured by combining the yoke portions 5c-1 in an annular shape. Here, 5hc represents a contact portion between adjacent yoke portions 5c-1, and 5c-3 represents a crimped portion (a crimped portion with a core member in the stacking direction) provided at a substantially central position of the yoke portion or the teeth portion. Yes.

  The core member 5D of the stator core shown in FIG. 6 (d) includes a plurality of core member pieces 5d having a yoke portion 5d-1 and teeth portions 5d-2 extending from the yoke portion 5d-1 in the inner circumferential direction. It is configured by combining the yoke portions 5d-1 of the plurality of core member pieces 5d in an annular shape. Here, 5 gd is an air gap provided between adjacent yoke parts 5 d-1, and 5 d-3 is a caulking part (caulking part with a core member in the stacking direction) provided at a substantially central position of the yoke part or the teeth part. Represents.

  Thus, when the core members 5A and 5C are fitted to the external structure 4, the adjacent core member pieces 5a and 5c are in close contact with each other at the contact portions 5ha and 5hc. Therefore, the compressive stress at the time of fitting of the external structure 4 is transmitted to the contact portions 5ha and 5hc, and the core members 5A and 5C are stably fixed to the external structure 4. The core members 5A and 5C correspond to the first core member in the claims.

  On the other hand, when the core members 5B and 5D are fitted to the external structure 4, gaps 5gb and 5gd are provided between the adjacent core members 5b and 5d. Therefore, since the compressive stress at the time of fitting the external structure 4 is not transmitted in the circumferential direction of the yoke portion, the compressive stress is not generated in the main magnetic flux region between the adjacent tooth portions, and iron loss can be reduced. it can. In addition, the compressive stress at the time of the fitting of the external structure 4 concentrates on the crimping | crimped part 5b-3, 5d-3 provided in the approximate center position of the yoke part or teeth part of the core member pieces 5b and 5d. The core members 5B and 5D correspond to the second core member in the claims.

  FIG. 7 is a view showing a lamination example of core members of a stator core according to Embodiment 2 of the present invention. 7A and 7C, when the core members 5A and 5C in FIGS. 6A and 6C and the core members 5B and 5D in FIGS. 6B and 6D are stacked in the stacking direction, The schematic diagram when contact part 5ha and 5hc of this or the space | gap 5gb and 5gd is seen from the outer peripheral side is shown.

  In FIG. 7, the core members 5A and the core members 5C are alternately stacked one by one (or may be a plurality of core members), and are fitted to the inner periphery of the external structure 4 (not shown). Here, when the core members 5A and 5C are stacked in the axial direction of the rotating electrical machine, the positions of the contact portions 5ha and 5hc between the adjacent core member pieces 5a and 5c are shifted in the circumferential direction when viewed in the stacking direction. It is configured. As described above, the reason why the two types of core members 5A and 5C are alternately stacked, that is, the positions of the contact portions 5ha and 5hc of adjacent core member pieces are shifted in the circumferential direction when viewed in the stacking direction. The reason for this is to secure a magnetic path that detours in the stacking direction even if the circumferential magnetic resistance in the same plane increases due to the compressive stress at the contact portions 5ha and 5hc. . As a result, an increase in magnetic resistance can be suppressed.

  Similarly, the core members 5B and the core members 5D are alternately stacked one by one (or a plurality of cores). Here, when the core members 5B and 5D are stacked in the axial direction of the rotating electrical machine, the positions of the gaps 5gb and 5gd between the adjacent core member pieces 5b and 5d are shifted in the circumferential direction when viewed in the stacking direction. It is configured. As described above, the reason why the two types of core members 5B and 5D are alternately stacked, that is, the positions of the gaps 5gb and 5gd of the adjacent core member pieces are shifted in the circumferential direction when viewed in the stacking direction. The reason for the configuration is to secure a magnetic path that bypasses in the stacking direction even if the circumferential magnetic resistance in the same plane increases due to the gaps 5gb and 5gd. As a result, an increase in magnetic resistance can be suppressed.

  The gaps 5gb and 5gd of the core members 5B and 5D are as small as possible. For example, if the gaps 5gb and 5gd can be set to 1 μm or less, it will not be over, but there is a detour magnetic path in the stacking direction. It is desirable to set, and in some cases, it is possible to enlarge to about 100 μm.

  In the example of FIG. 7, the stator core 5 is divided into 5 blocks in the stacking direction, the core blocks 5A and 5C are stacked at the upper and lower ends and the center, and the core members 5B and 5D are positioned at the middle two locations. Arranged so that laminated blocks come. Further, as described above, in each of the core members 5A and 5C and the core members 5B and 5D, the contact portions 5ha and 5hc or the gaps 5gb and 5gd are configured to be shifted in the circumferential direction when viewed in the stacking direction. There are four types of core member shapes.

  As described above, the laminated blocks of the core members 5A and 5C are dispersed in three places, and in this block, the compressive stress at the time of fitting the external structure 4 is transmitted to the contact portions 5ha and 5hc. Stable fixation with the structure 4 is performed. On the other hand, when the laminated blocks of the core members 5B and 5D are configured at half the height of the total laminated height at the above-mentioned two intermediate positions, the compressive stress at the time of fitting of the external structure 4 is void in the block. It is not transmitted in the circumferential direction by 5 gb and 5 gd, and the increase in iron loss is suppressed to half of the conventional one.

  FIG. 8 is a view showing another example of stacking of core members of a stator core according to Embodiment 2 of the present invention. FIG. 8 shows the contact portion 5ha or the gap 5gb between the core member 5A shown in FIG. 6A and the core member 5B shown in FIG. Schematic view when seen.

  In FIG. 8, a plurality of core members 5 </ b> A and core members 5 </ b> B (3 in the figure) are alternately stacked and fitted to the inner periphery of the external structure 4 (not shown). Here, when the core members 5A and 5B are stacked in the axial direction of the rotating electrical machine, the positions of the contact portions 5ha and the gaps 5gb between the adjacent core member pieces 5a and 5b are shifted in the circumferential direction when viewed in the stacking direction. It is configured as follows. As described above, the reason why the positions of the contact portions 5ha and the gaps 5gb of the adjacent core members are shifted in the circumferential direction when viewed in the stacking direction is the same surface due to the compressive stress in the contact portions 5ha. This is to ensure a magnetic path that detours in the stacking direction even if the circumferential magnetic resistance increases. Another reason is to secure a magnetic path that detours in the stacking direction even if the circumferential magnetic resistance in the same plane increases due to the gap 5gb. As a result, an increase in magnetic resistance can be suppressed.

  Moreover, in the example of FIG. 8, since the core member 5A and the core member 5B are alternately laminated | stacked for every several sheets, it is sufficient to prepare two types of press-shaped core members 5A and 5B. Further, when the plurality of sheets are alternately stacked, the insertion friction of the overlap portion when the core members are assembled in an annular shape is reduced as compared with the case where the sheets are alternately stacked one by one.

  As described above, in the stator core of the rotating electrical machine according to the present embodiment, when the yoke portions 5a-1 or 5c-1 are combined in an annular shape, adjacent yoke portions abut on the abutting portions 5ha or 5hc. A core having a gap 5gb or 5gd between adjacent yoke parts when the first core member 5A or 5C composed of the core member pieces 5a or 5c and the yoke part 5b-1 or 5d-1 are combined in an annular shape. It is comprised by the 2nd core member 5B or 5D which consists of member piece 5b or 5d.

  Furthermore, the first core member has two types of core members 5A configured such that the positions of the contact portions 5ha and 5hc between adjacent core member pieces are shifted in the circumferential direction when viewed in the stacking direction. And 5C.

  Further, the core members 5B and 5D having two types of shapes configured such that the positions of the gaps 5gb and 5gd between the second core member and the adjacent core member pieces are shifted in the circumferential direction when viewed in the stacking direction. Is made up of

  Further, the position of the contact portion 5ha or 5hc between the adjacent core member pieces of the first core member 5A or 5C and the gap 5gb or 5gd between the adjacent core member pieces of the second core member 5B or 5D. The position is configured to be shifted in the circumferential direction when viewed in the stacking direction.

  By comprising in this way, in the 2nd core member 5B or 5D, the compressive stress for fixation to the external structure 4 is not transmitted to the circumferential direction, but the increase in the iron loss in a main magnetic flux area | region is suppressed. Can do. On the other hand, the fixing to the external structure is stably performed by the first core member 5A or 5C.

  Further, even if the circumferential magnetic resistance in the same plane increases due to the compressive stress in the contact portion 5ha or 5hc of the first core member 5A or 5C, it is possible to secure a magnetic path that bypasses in the stacking direction. it can. Furthermore, even if the circumferential magnetic resistance in the same plane increases due to the gap 5gb or 5gd of the second core member 5B or 5D, a magnetic path that bypasses in the stacking direction can be secured. As a result, an increase in magnetic resistance can be suppressed.

  In the description of the second embodiment, the number and arrangement of the stator cores 5 when the stator cores 5 are divided in the stacking direction, and the ratio between the first core members 5A and 5C and the second core members 5B and 5D are almost halved. However, the present invention is not limited to these numbers. For example, if the ratio of the first core members 5A and 5C is reduced to 50% or less of the whole, for example, 10 to 40%, further iron Reduction of loss can be expected.

  In the second embodiment, an example of stacking and fixing by caulking has been shown. However, stacking and fixing by an adhesive steel plate, or stacking and fixing by insulator integral molding may be used.

  Further, the effect can be obtained even when the core members of the first embodiment and the second embodiment are used in combination.

  Further, in the case of the core member divided for each tooth unit, even if the core member is not completely separated, a divided core member that is joined to be rotatable or bendable at the connecting portion can also be effective.

  Furthermore, in the above embodiment, as an example of fixing the stator core to the external structure, shrink fitting or press fitting has been described as an example, but other than that, compressive stress is applied from the outer periphery of the stator core, such as cold fitting. The present invention is also effective with respect to a fixing method in which is added.

  The present invention relates to a structure that is used as a stator core of a rotating electrical machine mounted on, for example, a compressor for a refrigerator, and more particularly to a structure in which the stator core is fixed to an external structure by shrink fitting, press fitting, or the like.

It is sectional drawing of the axial direction which shows the rotary electric machine by Embodiment 1 of this invention. It is sectional drawing of the II-II line | wire of FIG. 1, Comprising: It is a figure which shows the shape of the core member of Embodiment 1. FIG. It is sectional drawing of the III-III line of FIG. 1, Comprising: It is a figure which shows the shape of the core member of Embodiment 1. FIG. It is a figure which shows the other shape of the core member by Embodiment 1 of this invention. It is a figure which shows the other shape of the core member by Embodiment 1 of this invention. It is a figure which shows the core member of the stator core by Embodiment 2 of this invention. It is a figure which shows the lamination example of the core member of the stator core by Embodiment 2 of this invention. It is a figure which shows the lamination example of the core member of the stator core by Embodiment 2 of this invention. It is a figure which shows the structure of the conventional split stator core.

Explanation of symbols

1 Stator core, 1A Laminate part that contributes to fixing to external structure,
1B Laminated portion that does not contribute to fixing to the external structure, 1a, 1b core member,
1a-1, 1b-1 yoke part, 1a-2, 1b-2 teeth part, 1g gap,
2 winding, 3 rotor, 4 external structure, 5 stator core, 5A-5D core member,
5a to 5d core member pieces, 5a-1 to 5d-1 yoke portions,
5a-2 to 5d-2 teeth part, 5a-3 to 5d-3 caulking part,
5ha, 5hc contact part, 5gb, 5gd gap, 9 rotating shaft, 10 rotating electrical machine.

Claims (5)

It is constituted by laminating a plurality of core members, and the laminated core member is a stator core of a rotating electrical machine fitted to the inner periphery of an external structure,
The stator core is configured by combining a plurality of core members having a yoke portion and teeth portions extending in the inner circumferential direction from the yoke portion, and the yoke portions are combined in an annular shape. In what consists of a laminated part of the core member that contributes to fixing to the core and a laminated part of the core member that does not contribute to fixing to the external structure,
The core member that contributes to fixing to the external structure is composed of a first core member that is composed of a core member piece in which adjacent yoke portions abut at the abutment portion when the yoke portions are combined in an annular shape. As well as
The core member that does not contribute to fixing to the external structure is configured by a second core member that includes a core member piece having a gap between adjacent yoke portions when the yoke portions are combined in an annular shape. A stator core of a rotating electrical machine characterized by The first core member includes two types of core members configured such that the positions of the contact portions between adjacent core member pieces are shifted in the circumferential direction when viewed in the stacking direction. The stator iron core for a rotating electrical machine according to claim 1. The second core member is composed of two types of core members configured such that the position of the gap between adjacent core member pieces is shifted in the circumferential direction when viewed in the stacking direction. The stator iron core for a rotating electrical machine according to claim 1. When the position of the contact portion between the adjacent core member pieces of the first core member and the position of the gap between the adjacent core member pieces of the second core member are viewed in the stacking direction, The stator core for a rotating electrical machine according to claim 1, wherein the stator core is configured to be displaced. The stator core according to any one of claims 1 to 4, a winding wound around the stator core, and a rotation disposed so as to face the stator core and attached to a rotating shaft. A rotating electrical machine comprising a child and an external structure for mounting the stator iron core on the inner periphery thereof.

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