JP5354780B2 - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator having a simple structure and allows a plurality of iron cores to be assembled firmly, and which improves the efficiency. <P>SOLUTION: The stator 10 includes a housing 20, an annular stator holder 30 attached to the housing 20, and an annular stator group 40 press-fitted and fixed in the stator holder 30, with a plurality of stator pieces 41 arrayed in annular form. Each stator piece 41 has a split iron core 50, in which a plurality of electromagnetic steel plates are stacked, an insulating member 60 which insulates the segmental iron core 50, and a stator coil 42, which is wound around the split iron core 50 via the insulating member 60. The split iron core 50 includes the first core 51 and the second core 52, and the first core 51 consists of electromagnetic steel plates 51a, where rolling takes place circumferential direction and has a hole 55 which extends radially at the tooth part 54, and the second core 52 is constituted of electromagnetic steel plates 52a, where rolling takes in radial direction and is arranged in the hole 55. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a stator, and more particularly to a stator used in a rotating electric machine such as an electric motor or a generator.

  A stator such as an electric motor or a generator includes a plurality of teeth cores arranged at predetermined intervals on the circumference, and a plurality of core back iron cores arranged between adjacent teeth cores and arranged in an annular shape. A stator coil is wound around the tooth iron core via an insulating member.

  The conventional stator includes a plurality of substantially L-shaped core back iron cores and a plurality of teeth iron cores, and the engaging portions formed respectively on the core back iron core and the teeth iron cores are engaged with each other. In combination, the core back iron core is a directional silicon steel sheet that is easily magnetized in the circumferential direction, and the teeth iron core is a directional silicon steel sheet that is easily magnetized in the radial direction to improve the stator efficiency. (For example, refer to Patent Document 1).

  Further, another conventional stator includes a stator yoke having a plurality of concave portions having constricted portions, and a stator tooth having convex portions that are engaged with the concave portions. The stator yoke and the stator teeth are assembled integrally by engaging the stator yoke and the stator teeth, and by using directional silicon steel plates having different rolling directions, the iron loss is reduced and the stator efficiency is improved. What has been improved is known (for example, see Patent Document 2).

JP 2004-229473 A JP 2007-209070 A

  However, in the stators described in Patent Document 1 and Patent Document 2, when two types of iron cores are combined to form an integral stator core, if the iron cores are not properly positioned, misalignment occurs between the iron cores. There was a possibility of affecting the performance. For this reason, high dimensional accuracy and shape accuracy are required for the engaging portion or the concavo-convex portion to be fitted to each other, which has been a factor in increasing the manufacturing cost. In addition, a stator core having a structure in which a plurality of iron cores are combined requires sufficient assembly strength against vibration and external stress, and there is room for improvement with specific fixing means.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a stator capable of firmly assembling a plurality of iron cores with a simple structure and improving the efficiency of the stator. It is in.

To achieve the above object, the invention described in claim 1 includes a housing (for example, the housing 20 in the embodiment) and an annular stator holder (for example, the stator holder 30 in the embodiment) attached to the housing. And an annular stator group (for example, the annular stator group 40 in the embodiment) having a plurality of stator pieces (for example, the stator piece 41 in the embodiment) that are press-fitted and fixed to the stator holder and arranged in an annular shape. The stator piece includes a split core (for example, the split core 50 in the embodiment) in which a plurality of electromagnetic steel plates are stacked, and an insulating member (for example, an insulating member in the embodiment) that insulates the split core. 60) and a stator coil (for example, the stator coil 42 in the embodiment) wound around the split iron core via an insulating member (for example, the stator coil 42). In the stator 10) in the embodiment, the split iron core includes a first iron core (for example, the base iron core 51 in the embodiment) and a second iron core (for example, the separate iron core 52 in the embodiment), 1 iron core is comprised from the electromagnetic steel plate (for example, silicon steel plate 51a in embodiment) which has a rolling direction in the circumferential direction, and the hole extended in the radial direction in the teeth part (for example, teeth part 54 in embodiment) (For example, the hole 55 in the embodiment), the second iron core is composed of an electromagnetic steel plate (for example, a silicon steel plate 52a in the embodiment) having a rolling direction in the radial direction, and is disposed in the hole . A predetermined gap (for example, radial gap C2 in the embodiment) is provided between both circumferential ends of the second iron core and the first iron core, and the gap is provided in the radial center of the tooth portion. It is characterized by being able to.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the resin (for example, the embodiment) is provided between the radially outer end portion of the hole and the radially outer end portion of the second iron core. The resin P) is arranged.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, at least one of the first iron core and the second iron core has a radially outer end portion of the hole and a radial direction of the second iron core. A resin injection portion (for example, a resin injection groove 57 in the embodiment) for injecting resin is provided between the outer end portion and the outer end portion.

According to the stator of the first aspect, the first iron core and the second iron core can be firmly assembled with a simple structure, and the manufacturing cost of the stator can be reduced. Moreover, since the iron loss of a split iron core can be reduced, the efficiency of a stator can be improved.
Further, by providing a predetermined gap between the circumferential ends of the second iron core and the first iron core, the compressive stress acting on the tooth portion due to winding of the stator coil can be relieved. Thereby, since the increase in the iron loss which generate | occur | produces when compression stress is added to a division | segmentation iron core can be suppressed, the efficiency of a stator can further be improved.
Further, since the gap is provided at the center portion in the radial direction of the tooth portion, the gap can be eliminated by winding the stator coil around the tooth portion. Thereby, since the flow of the magnetic flux which passes along a division | segmentation iron core can be made smooth, the efficiency of a stator can further be improved.

  According to the stator of the second aspect, the second iron core can be pressed radially inward by the pressure of resin injection, and the second iron core can be brought into close contact with the inner peripheral side surface of the hole. Thereby, the flow of magnetic flux passing through the split iron core can be made smooth even though the split iron core is composed of two parts, the first iron core and the second iron core, thereby preventing a reduction in the efficiency of the stator. Can do. Moreover, since the 1st iron core and the 2nd iron core closely_contact | adhere, a 1st iron core and a 2nd iron core can be assembled | attached still more firmly.

  According to the stator of the third aspect, since the resin can be easily injected between the first iron core and the second iron core via the resin injection portion, the production efficiency of the stator can be improved.

It is a front view for demonstrating 1st Embodiment of the stator which concerns on this invention. It is a disassembled perspective view of the stator shown in FIG. It is a principal part enlarged front view of the stator shown in FIG. It is a perspective view of the stator piece shown in FIG. It is a disassembled perspective view of the stator piece shown in FIG. It is a front view of the division | segmentation iron core shown in FIG. It is a front view of the division | segmentation iron core for demonstrating 2nd Embodiment of the stator which concerns on this invention. It is an enlarged view of the X section of FIG. FIG. 8 is an enlarged view of a Y part in FIG. 7. It is a principal part enlarged view of the state which inject | poured resin in the circumferential direction gap of FIG. It is a principal part enlarged view for demonstrating the flow of the magnetic flux of the split iron core of 2nd Embodiment. It is a principal part enlarged view for demonstrating the flow of the magnetic flux of a division | segmentation iron core when the radial direction outer end part of a separate iron core is a taper shape.

  Hereinafter, each embodiment of the stator concerning the present invention is described in detail based on an accompanying drawing. The drawings are viewed in the direction of the reference numerals.

(First embodiment)
First, with reference to FIGS. 1-6, 1st Embodiment of the stator which concerns on this invention is described.

  As shown in FIGS. 1 to 3, the stator 10 according to the present embodiment is arranged in an annular shape by housing 20, an annular stator holder 30 fixed to the housing 20, press-fitted and held in the stator holder 30. An annular stator group 40 having a plurality of stator pieces 41 and an annular power distribution member 90 to which the plurality of stator pieces 41 are connected are provided.

  The housing 20 includes an internal space 21 formed in a shape that can accommodate the stator holder 30 and the annular stator group 40, and a bolt hole 22 for fixing the stator holder 30 to the inner peripheral portion of the internal space 21. A plurality of bosses (fixed portions) 23 having the above are provided at predetermined positions in the circumferential direction. The housing 20 includes a terminal box 24 that is continuous with the internal space 21.

  The stator holder 30 includes a cylindrical portion 31 and a flange portion 32 provided so as to project radially outward at one end in the axial direction thereof. The inner diameter of the cylindrical portion 31 is set slightly smaller than the outer diameter of the annular stator group 40. A through hole 33 is formed in the flange portion 32 at a position corresponding to the bolt hole 22 of the housing 20. The stator holder 30 is accommodated in the internal space 21 of the housing 20, the flange portion 32 is aligned with the end surface of the boss 23, and the bolt 34 inserted through the through hole 33 is screwed into the bolt hole 22. It is fixed to the housing 20.

  As shown in FIGS. 4 and 5, the stator piece 41 is fitted so as to sandwich a split iron core 50 formed by laminating a plurality of silicon steel plates (electromagnetic steel plates) and a tooth portion 54 of the split iron core 50 in the axial direction. And the stator coil 42 wound around the tooth portion 54 via the insulating member 60.

  As shown in FIGS. 5 and 6, the split iron core 50 includes a base iron core 51 that is a first iron core and a separate iron core 52 that is a second iron core.

  The base iron core 51 is formed by laminating a plurality of silicon steel plates 51a formed in a substantially T shape by press working or the like, and a yoke portion 53 formed in the circumferential direction, and an approximately inner surface of the yoke portion 53. And a tooth portion 54 formed radially inward from the center. The teeth portion 54 is formed with a substantially rectangular hole 55 whose longitudinal direction extends in the radial direction. In addition, on both sides in the circumferential direction of the inner peripheral end of the tooth portion 54, a retaining portion 56 that protrudes in the circumferential direction is formed.

  Further, a substantially semicircular convex portion 53a is formed at one end (right end in FIG. 6) of the yoke portion 53 of the base iron core 51, and an adjacent base is formed at the other end (left end in FIG. 6). A substantially semicircular concave portion 53b is formed to which the convex portion 53a of the iron core 51 is fitted, and a plurality of divided iron cores 50 (stator pieces) are formed by fitting the convex portion 53a and the concave portion 53b of the adjacent base iron core 51 to each other. 41) are arranged in an annular shape.

  The separate iron core 52 is configured by laminating a plurality of silicon steel plates 52 a formed in the same substantially rectangular shape as the hole 55 of the base iron core 51 by pressing or the like, and is disposed in the hole 55 along the axial direction.

  In the present embodiment, silicon steel plates having different rolling directions are used for the base iron core 51 and the separate iron core 52 so that the magnetic flux flows smoothly through the divided iron core 50. Specifically, the silicon steel plate 51a of the base iron core 51 uses a silicon steel plate whose rolling direction is parallel to the circumferential direction of the split iron core 50 (the direction of arrow A in FIG. 6). For this, a silicon steel plate is used whose rolling direction is parallel to the radial direction of the split core 50 (the direction of arrow B in FIG. 6). Thereby, since the iron loss of the split iron core 50 is reduced, the efficiency of the stator 10 can be improved.

  The insulating member 60 is formed of a synthetic resin having electrical insulation, and includes a first insulating member 61 and a second insulating member 62 that are divided in the axial direction as shown in FIGS. 4 and 5. The first insulating member 61 and the second insulating member 62 are combined between the first insulating member 61 and the second insulating member 62 by combining the tooth portions 54 of the split core 50 so as to be sandwiched in the axial direction. An iron core 50 is disposed. Further, the insulating member 60 has a bobbin shape having flanges 63 at both ends in the radial direction by combining the first insulating member 61 and the second insulating member 62 in the axial direction.

  As shown in FIGS. 4 and 5, the first insulating member 61 includes a first vertical wall portion 64 having a substantially U-shaped cross section that covers substantially half of the tooth portion 54 from one axial end side, and a first vertical wall portion. 64, which are formed at both ends in the radial direction, respectively, extend from the first vertical wall 64 to the first outer peripheral side flange 63a and the first inner peripheral side flange 63b constituting a part of the flange 63. And a wall portion 65 that covers one side surface of the yoke portion 53 and a midpoint connecting wall portion 66 that extends radially inward from the first vertical wall portion 64.

  The wall portion 65 is formed with two top plate portions 67 extending outward in the axial direction from the outer peripheral edge thereof. The top plate portion 67, the wall portion 65, and the first outer peripheral side flange portion 63a are used as the first top plate portion 67. A bathtub-shaped power distribution unit 68 is provided on the outer peripheral side of the insulating member 61. The power distribution unit 68 accommodates a power distribution member 90 composed of three bus rings (feed lines) 91U, 91V, and 91W of U phase, V phase, and W phase.

  In the power distribution member 90, bus rings 91U, 91V, 91W formed in a ring shape having the same diameter are arranged concentrically while being shifted in the axial direction. The three bus rings 91U, 91V, 91W are made of resin. It is bundled by a mold part (bundling member) 92. And the one end 42a of the stator coil 42 of the stator piece 41 corresponding to each is connected to bus ring 91U, 91V, 91W (refer FIG. 3).

  As shown in FIG. 1, connection terminals 93U, 93V, and 93W extend radially outward from the bus rings 91U, 91V, and 91W, and the connection terminals 93U, 93V, and 93W are connected to the terminal box 24. It is connected to power supply terminals 95U, 95V, and 95W via bus bars 94U, 94V, and 94W disposed therein.

  In addition, a substantially rectangular resin injection port 69 having a width slightly larger than the circumferential width of the tooth portion 54 is formed in the wall portion 65.

  The midpoint connecting wall portion 66 is formed with a partition plate portion 70 extending outward in the axial direction from the inner peripheral edge thereof. The partition plate portion 70, the midpoint connecting wall portion 66, and the first inner periphery A bathtub-shaped power distribution unit 71 is provided on the inner peripheral side of the first insulating member 61 by the side flange 63b. The power distribution unit 71 houses a midpoint terminal 72, and the other ends 42b of the adjacent stator coils 42 are connected to each other (see FIG. 3). Thereby, all the stator coils 42 are connected in an annular shape via the midpoint terminal 72.

  As shown in FIG. 5, the second insulating member 62 includes a second vertical wall portion 81 having a substantially U-shaped cross section that covers substantially half of the tooth portion 54 from the other axial end side, and a second vertical wall portion 81. A second outer peripheral side flange 63c and a second inner peripheral side flange 63d that are formed at both ends in the radial direction and constitute a part of the flange 63 are provided.

  In the present embodiment, as shown in FIGS. 4 and 5, the first outer peripheral side flange 63a of the first insulating member 61 is radially outer, the first vertical wall 64 is circumferentially inner, and the first inner A step-like first fitting portion 85 is continuously formed at the axially open end on the radially inner side of the circumferential side flange 63b, and the radial direction of the second outer circumferential side flange 63c of the second insulating member 62. A step-like second fitting portion 86 is continuously formed on the inner side, the outer side in the circumferential direction of the second vertical wall portion 81, and the axially open end on the outer side in the radial direction of the second inner peripheral side flange portion 63 d. Then, by fitting the first fitting portion 85 and the second fitting portion 86 in the axial direction, the first insulating member 61 and the second insulating member 62 are combined to form an integral insulating member 60.

  In the stator 10 configured as described above, the separate core 52 is disposed in the hole 55 of the base core 51, the insulating member 60 is placed on the teeth portion 54 of the base core 51, and the stator coil 42 is further wound. Therefore, the base iron core 51 and the separate iron core 52 are firmly and integrally assembled.

  Further, since the outer shape of the split iron core 50 is composed of only the base iron core 51, the rigidity against vibration and external stress is high, and positional deviation between the base iron cores 51 arranged in an annular shape is prevented. For this reason, the annular stator group 40 can be held by the stator holder 30 by shrink fitting or press-fitting as in the conventional stator.

  Further, since the compressive stress acts on the tooth portion 54 of the base iron core 51 by the wound stator coil 42, the tooth portion 54 is elastically deformed, and a slight amount between the base iron core 51 and the separate iron core 52. The gap is eliminated and the base iron core 51 and the separate iron core 52 are brought into close contact with each other. As a result, the flow of magnetic flux passing through the split core 50 is not hindered at the joint between the base core 51 and the separate core 52, so the split core 50 is composed of two parts, the base core 51 and the separate core 52. Despite this, the magnetic flux flows smoothly.

  As described above, according to the stator 10 of the present embodiment, the split iron core 50 includes the base iron core 51 and the separate iron core 52, and the hole 55 extending in the radial direction is formed in the tooth portion 54 of the base iron core 51. Since the separate iron core 52 is disposed in the hole 55, the base iron core 51 and the separate iron core 52 are firmly formed with a simple structure rather than a combination of parts having a complicated shape of the engaging portion as in the conventional stator. Can be assembled. Further, since the base iron core 51 and the separate iron core 52 have a simple structure, the manufacturing cost of the stator 10 can be reduced.

  Moreover, according to the stator 10 of this embodiment, the base iron core 51 is comprised from the silicon steel plate 51a which has a rolling direction in the circumferential direction, and the separate iron core 52 is comprised from the silicon steel plate 52a which has a rolling direction in radial direction. Therefore, since the iron loss of the split iron core 50 can be reduced, the efficiency of the stator 10 can be improved.

  Further, according to the stator 10 of the present embodiment, since the outer shape of the split core 50 is configured only by the base core 51, the rigidity of the split core 50 is made equal to the case where the conventional split core is configured by a single component. It is possible to prevent the positional deviation between the base iron cores 51 arranged in an annular shape. Thereby, the annular stator group 40 can be held on the stator holder 30 by shrink fitting or press-fitting as in the conventional stator.

(Second Embodiment)
Next, a second embodiment of the stator according to the present invention will be described with reference to FIGS. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.

  In the present embodiment, as shown in FIGS. 7 and 8, the hole 55 of the base iron core 51 extends to the radial center of the yoke portion 53, and the radial width of the separate iron core 52 is the radial width of the hole 55. When the separate core 52 is disposed in the hole 55, the resin is formed between the radially outer end surface of the hole 55 and the radially outer end surface of the separate core 52 as shown in FIG. A circumferential clearance C1 is formed for injecting.

  In the present embodiment, as shown in FIG. 8, the yoke portion 53 of the base iron core 51 communicates with the central portion in the circumferential direction of the circumferential gap C1, and is substantially semicircular for injecting resin into the circumferential gap C1. The resin injection groove (resin injection portion) 57 is formed. The resin injection groove 57 communicates with the resin injection port 69 of the first insulating member 61 when the first insulating member 61 and the split core 50 are combined. Note that the position where the resin injection groove 57 is formed, that is, the central portion in the circumferential direction of the yoke portion 53 and the vicinity of the outer peripheral surface is the portion that most hardly impedes the flow of magnetic flux through the split core 50.

  Moreover, in this embodiment, as shown in FIG.8 and FIG.9, when the recessed part 58 is formed in the circumferential direction both sides | surfaces of the hole 55 of the base iron core 51, and the separate iron core 52 is arrange | positioned in the hole 55, A predetermined radial gap C <b> 2 is formed between the circumferential end surfaces of the separate iron core 52 and the recess 58. In the present embodiment, the radial gap C <b> 2 (recessed portion 58) is formed at the radial center of the tooth portion 54 of the base iron core 51.

  In the present embodiment, the radial gap C <b> 2 is formed by forming the concave portion 58 in the hole 55. However, the present invention is not limited to this, and the concave portion 58 is formed on both circumferential end surfaces of the separate core 52. The radial gap C2 may be formed by the above, and the radial gap C2 may be formed by forming protrusions at both ends in the radial direction on both sides of the hole 55 in the circumferential direction. The radial gap C <b> 2 may be formed by forming protrusions at both radial ends of the circumferential end faces of 52.

  In the stator 10 configured as described above, the separate core 52 is disposed in the hole 55 of the base core 51, so that a circumferential space is formed between the radially outer end surface of the separate core 52 and the radially outer end surface of the hole 55. A direction gap C1 is formed. When the resin P is injected into the power distribution unit 68 from a nozzle (not shown) to insulate the power distribution member 90, the injected resin P is injected into the resin injection port 69 and the resin injection groove 57 simultaneously with the insulation process of the power distribution unit 68. The circumferential gap C1 is filled with the resin P (see FIG. 10). At this time, the separate core 52 is pressed radially inward by the pressure of the injected resin P, so that the separate core 52 is in close contact with the inner peripheral side surface of the hole 55. As a result, the flow of magnetic flux passing through the split core 50 is not hindered at the joint between the base core 51 and the separate core 52, so the split core 50 is composed of two parts, the base core 51 and the separate core 52. Despite this, the magnetic flux flows smoothly.

  Further, the compressive stress acts on the tooth portion 54 of the base iron core 51 by the wound stator coil 42, so that the tooth portion 54 is elastically deformed. This elastic deformation is caused by the radial gap C <b> 2 (recessed portion of the hole 55). 58), the compressive stress acting on the tooth portion 54 is relieved. Thereby, since the increase in the iron loss which generate | occur | produces when a compressive stress is applied to the split iron core 50 is suppressed, it becomes possible to improve the efficiency of the stator 10.

  Further, since the tooth portion 54 is elastically deformed by the compression stress of the wound stator coil 42, the radial gap C2 is eliminated, and the base iron core 51 and the separate iron core 52 are brought into close contact with each other. As a result, the flow of magnetic flux passing through the split core 50 is not hindered at the joint between the base core 51 and the separate core 52, so the split core 50 is composed of two parts, the base core 51 and the separate core 52. Despite this, the magnetic flux flows smoothly.

Next, with reference to FIG.11 and FIG.12, the flow of the magnetic flux by the shape of the radial direction outer end part of the separate iron core 52 is demonstrated.
As in the present embodiment shown in FIG. 11, when the outer end of the separate core 52 is square and the gap through which the magnetic flux passes is wide, the flow of the magnetic flux is not hindered. It is more efficient and preferable that the radially outer end has a wide opening. On the other hand, as shown in FIG. 12, when the radially outer end of the separate iron core 52 is tapered and the frontage through which the magnetic flux passes is narrow, the magnetic flux is saturated at the narrowest part of the frontage. The flow is obstructed. In addition, the dashed-dotted line shown in the figure represents the flow of magnetic flux.

  As described above, according to the stator 10 of the present embodiment, the resin P is injected between the radially outer end portion of the hole 55 and the radially outer end portion of the separate iron core 52. Thus, the separate iron core 52 can be pressed radially inward, and the separate iron core 52 can be brought into close contact with the inner peripheral side surface of the hole 55. As a result, the flow of magnetic flux passing through the split iron core 50 can be made smooth despite the fact that the split iron core 50 is composed of two parts, the base iron core 51 and the separate iron core 52. Can be prevented. Further, since the base iron core 51 and the separate iron core 52 are in close contact with each other, the base iron core 51 and the separate iron core 52 can be assembled more firmly.

  Further, according to the stator 10 of the present embodiment, the resin injection groove 57 for injecting the resin P between the radial outer end of the hole 55 and the radial outer end of the separate core 52 is formed in the base iron core 51. Since the resin P is provided, the resin P can be easily injected between the base iron core 51 and the separate iron core 52 through the resin injection groove 57, so that the production efficiency of the stator 10 can be improved.

  Further, according to the stator 10 of the present embodiment, the recesses 58 are formed on both side surfaces in the circumferential direction of the hole 55 of the base iron core 51, and a predetermined gap is provided between the circumferential end surfaces of the separate iron core 52 and the base iron core 51. Since the radial gap C <b> 2 is formed, the compressive stress acting on the tooth portion 54 by winding the stator coil 42 can be relaxed. Thereby, since the increase in the iron loss which generate | occur | produces when compression stress is added to the division | segmentation iron core 50 can be suppressed, the efficiency of the stator 10 can further be improved.

Further, according to the stator 10 of the present embodiment, the radial gap C2 is formed in the central portion in the radial direction of the tooth portion 54. Therefore, the radial gap C2 is formed by winding the stator coil 42 around the tooth portion 54. Can be eliminated. Thereby, since the flow of the magnetic flux which passes along the division | segmentation iron core 50 can be made smooth, the efficiency of the stator 10 can further be improved.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

DESCRIPTION OF SYMBOLS 10 Stator 20 Housing 30 Stator holder 40 Annular stator group 41 Stator piece 42 Stator coil 50 Split iron core 51 Base iron core (1st iron core)
51a Silicon steel sheet (electromagnetic steel sheet)
52 Separate iron core (second iron core)
52a Silicon steel sheet (electromagnetic steel sheet)
53 Yoke part 54 Teeth part 55 Hole 57 Resin injection groove (resin injection part)
58 Recessed portion 60 Insulating member 90 Power distribution member C1 Circumferential clearance C2 Radial clearance P Resin

Claims (3)

A housing, an annular stator holder attached to the housing, and an annular stator group having a plurality of stator pieces press-fitted and fixed to the stator holder and arranged in an annular shape,
The stator piece includes a split iron core in which a plurality of electromagnetic steel plates are laminated, an insulating member that insulates the split iron core, and a stator coil that is wound around the split iron core via the insulating member. In
The split iron core consists of a first iron core and a second iron core,
The first iron core is composed of a magnetic steel sheet having a rolling direction in the circumferential direction, and has a hole extending in a radial direction in a tooth portion thereof.
The second iron core is composed of a magnetic steel sheet having a rolling direction in the radial direction, and is disposed in the hole .
A predetermined gap is provided between both circumferential ends of the second iron core and the first iron core,
The said clearance gap is provided in the radial direction center part of the said teeth part, The stator characterized by the above-mentioned .   The stator according to claim 1, wherein a resin is disposed between a radially outer end portion of the hole and a radially outer end portion of the second iron core.   At least one of the first iron core and the second iron core is provided with a resin injection portion for injecting resin between a radial outer end portion of the hole and a radial outer end portion of the second iron core. The stator according to claim 1 or 2.

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