JP2009213310A - Stator of rotating electrical machine and the rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electrical machine having a stator core which is easily assembled and is less in deterioration of magnetic properties and also less in increase of magnetic resistance, and to provide a rotating electrical machine. <P>SOLUTION: The stator 3 of the rotating electrical machine is equipped with the stator core 30, wherein divided cores 32 having a plurality of laminated core piece members 32a are arranged over the entire periphery in the peripheral direction and a plurality of slots 31 are partitioned in the peripheral direction, and with coils 4 wound in the slot 31. At least one divided core 32 has an overlapping part 321c, which overlaps with an adjacent divided core 32, when the stator core 30 is formed; and the overlapped part 321c of at least one core piece member 32a constituting the divided core 32 is formed smaller than the thickness of the base end, in the thickness of the tip end 321c'. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator of a rotating electrical machine and a rotating electrical machine.

  In a rotating electrical machine mounted on a vehicle, a space for mounting is reduced, while an improvement in power generation output due to an increase in vehicle load is required. In particular, in order to reduce the size and increase the output of the rotating electrical machine, it was necessary to reduce the winding resistance value of each phase winding and the magnetic resistance of the stator.

  Conventionally, as shown in FIG. 17 and FIG. 18, in the stator core 30 configured in a ring shape by connecting the divided cores 32 in which a plurality of core piece members 32 a are stacked in the circumferential direction, By laminating the back-front-back (so that the front surface and the back surface face each other) and overlapping the end portions of each core piece member 32a every other end portion of the split core 32 is one end portion. The protrusions and recesses 32A are formed so as to protrude every other time (see, for example, Patent Document 1). As schematically shown in FIG. 19, when the divided cores 32 are connected to each other in the circumferential direction (moved in the direction of the arrow), the convex portions are caught due to a variation in the thickness of the core piece member 32a and are assembled and assembled. There was something I couldn't do.

Recently, as shown in FIG. 20 and FIG. 21, the core piece member 32a in which the plate thickness of the end portion of the core piece member 32a is thinned by pressing is laminated to form the divided core 32, and the stator is connected in the circumferential direction. The core 30 was disclosed (for example, refer to Patent Document 2).
JP-A-7-222383 JP 2003-164080 A

  In the above-described conventional stator core, the split cores may not be connected and assembled in the circumferential direction due to variations in the thickness of the core piece member, deformation of the core piece member, or the like. In addition, the stator core having a thin plate at the end of the core piece member can be assembled, but the magnetic characteristics deteriorate due to the thin plate by press (increase in iron loss) and the axial gap δ (see FIG. 21). ) Caused an increase in magnetic resistance.

  The present invention has been made in view of the above-described problems of the conventional stator core, and provides a stator and a rotary electric machine for a rotating electric machine having a stator core that is easy to assemble and has a low magnetic property deterioration and a small increase in magnetic resistance. The task is to do.

  The stator according to the present invention made to solve the above-described problems is formed by dividing a plurality of cores having a plurality of core piece members disposed over the entire circumference in the circumferential direction, thereby dividing a plurality of slots in the circumferential direction. In a stator of a rotating electric machine including a stator core and a coil assembled in the slot, at least one of the split cores overlaps with the adjacent split core when the stator core is formed. The overlapping portion of at least one of the core piece members constituting the split core has a distal end portion formed thinner than a proximal end portion.

  In the stator core described above, the tip end portion of the overlapping portion of the core piece member may be an end portion that begins to overlap when the stator core is formed.

  In the stator core, the core piece member projects in a radial direction from a core back portion that forms a core back formed in a circumferential direction when the stator core is formed, and a core back portion. And a tooth portion that defines at least a part of the slot, and the overlapping portion is preferably formed on the outer diameter side of the core back portion.

  In the stator core described above, the core piece member may be made of one metal plate or two or more metal plates stacked.

  In the stator, the coil may be formed by winding a plurality of phase windings so as to form a wave shape in the circumferential direction of the stator core.

  A rotating electrical machine of the present invention made to solve the problem is characterized by using the stator of the rotating electrical machine described above.

  According to the present invention, the split core has an overlap portion that overlaps with an adjacent split core when the stator core is formed, and the overlap portion of at least one core piece member that constitutes the split core has a thickness at its tip portion. Therefore, when the divided cores are assembled in the circumferential direction, the end portions of the core piece members are not caught and easy to assemble.

  Further, the leading end of the overlapping portion of the core piece member is an end portion that begins to overlap when the stator core is formed, and since this end portion has a low magnetic density, the rotating electrical machine is deteriorated due to deterioration of magnetic characteristics and increase in magnetic resistance. Performance degradation can be suppressed.

  Moreover, the overlapping part of the core piece member is formed on the outermost diameter side of the core back part. Usually, the magnetic flux flows in the circumferential direction through the annular core back portion. However, in the annular shape, since the circumference on the inner diameter side is the shortest, the magnetic resistance is the lowest and the magnetic flux easily passes. Therefore, if the magnetic characteristics are deteriorated on the inner diameter side, the characteristics of the rotating electrical machine are most deteriorated. That is, by setting the overlapping part of the core piece members on the outer diameter side, it is possible to further suppress the deterioration of the performance of the rotating electrical machine due to the deterioration of the magnetic characteristics and the increase of the magnetic resistance.

  In addition, since the core piece member is made of one metal plate or two or more stacked metal plates, the thickness of the front end portion of the overlapping portion can be easily reduced by pressing or the like from the base end portion.

  In addition, since each of the plurality of phase windings is wound in a circumferential direction of the stator core, the coil is wound between the phase windings wound in a wavy manner. The stator can be assembled by inserting the teeth of the split core from the outer periphery.

  The rotating electrical machine according to the present invention uses the stator having the above-described effects, and exhibits the above-described effects.

  BEST MODE FOR CARRYING OUT THE INVENTION A stator and a rotating electrical machine of the best mode will be described with reference to the drawings.

  As shown in FIG. 1, the rotating electrical machine 1 according to the present invention includes a housing 10 in which a pair of substantially bottomed cylindrical housing members 100 and 101 are joined at openings, and bearings 110 and 111 on the housing 10. And a stator 3 fixed to the housing 10 at a position surrounding the rotor 2 inside the housing 10.

  The rotor 2 is formed with a plurality of magnetic poles that are alternately different in the circumferential direction by permanent magnets on the outer peripheral side facing the inner peripheral side of the stator 3. The number of magnetic poles of the rotor 2 is not limited because it varies depending on the rotating electric machine. In the rotating electrical machine of this embodiment, a rotor having 8 poles (N pole: 4, S pole: 4) is used.

  As shown in FIG. 2, the stator 3 includes a stator core 30, a three-phase coil 4 formed of a plurality of phase windings, and an insulation disposed between the stator core 30 and the coil 4. And a paper 5.

  As shown in FIG. 3, the stator core 30 includes a plurality of divided cores 32 in which a plurality of core piece members are stacked in the circumferential direction so that a part of the core piece members constituting the divided core 32 overlap each other (stator of this embodiment). 24 cores) are connected and have an annular shape in which a plurality of slots 31 are formed on the inner periphery. The number of slots 31 formed in the stator core 30 is formed at a ratio of two per one phase of the coil 4 with respect to the number of magnetic poles of the rotor 2. That is, 8 × 3 × 2 = 48 slots 31 are formed.

  FIG. 4 is a front view of the split core 32, and FIG. 5 is a view as seen from the arrow A in FIG. The split core 32 has a core piece member 32a made of an electromagnetic steel plate shown in FIG. 6 and FIG. 7 to be described later, as shown in FIG. 5a, front-back-front-back ... (so that the front and back faces each other). Is laminated in a direction perpendicular to When the front-back-front-back ... layers are stacked, as shown in FIG. 5a, every other recess 34 is formed, and the taper overlapping portion 321c of the split core adjacent to the recess 34 is engaged. That is, by laminating front-back-front-back ..., adjacent divided cores and core members overlap one by one. In addition, the core piece member 32a is good also as a laminated body of not only the form formed with one steel plate as shown to FIG. That is, when the split cores 32 are formed in the same orientation two by two like the front-front-back-back-front-front-back-back, etc., the core piece member 32a is the same. It consists of two steel plates that overlap in the direction. Further, as shown in FIG. 5b, steel plates may be laminated with the first half being front-front-front and the second half being back-back-back. In this way, when the divided core 32 is assembled in the stator core 30 by being connected in the circumferential direction so that the overlapping portions 321c (part) of the core piece members constituting the divided core 32 overlap, there are few overlapping portions. Assembly work becomes easy. In addition, when the core piece member 32a is formed by laminating three or more steel plates, each of the steel plates sandwiched between the two steel plates positioned at both ends in the stacking direction does not mold the tip portion of the overlapping portion 321c. Also good. Specifically, when the core piece member 32a is formed as in FIG. 5b, the first and tenth sheets from the bottom and the first and tenth sheets from the top as shown in FIG. 5c. The core piece member 32a has a distal end portion (corner portion) 321c ′ thinner than the thickness of the base end portion of the overlapping portion 321c, and the other core pieces 32a have corners having the same thickness as the thickness of the base end portion of the overlapping portion 321c. It may have a portion 321c. Also in this case, the assembly work is easy because there are few overlapping portions.

  The split core 32 has one slot 31 defined by two teeth 33 and two teeth 33. When the stator core 10 is formed, the teeth 33 also define the slots 31 with the teeth 33 of the adjacent divided cores 32.

  As shown in FIG. 6, the core piece member 32 a of the present embodiment is punched out of a 0.3 mm thick electromagnetic steel plate by a press, and has an arcuate outer periphery 321 a that forms part of the outer periphery of the stator core 30. And two base portions 321b extending in a radial direction from two locations of a base 321b having a substantially parallelogram shape composed of a base 321b opposite to the side 321a and a base 321b separated from both ends of the base 321b by a predetermined distance. Have.

  FIG. 7 is an enlarged view as viewed in the direction of arrow B in FIG. 6, and the corner portion (tip portion of the overlapping portion) 321c ′ farthest from the teeth portion 320 of the core back portion 321 extends toward the tip portion as shown in FIG. The thickness is gradually reduced from the thickness (0.3 mm) of the base end portion of the overlapping portion 321c to be tapered.

  As shown in FIG. 6, the core piece member 32a has a substantially parallelogram-shaped core back portion composed of an arcuate outer periphery 321a that forms part of the outer periphery of the stator core 30 and a bottom 321b that faces the side 321a. 7a has two teeth portions 320 extending in the radial direction from two locations of the base 321b that are separated from each other by a predetermined distance from both ends of the base 321 and the base 321b. As shown in FIG. 5, since the thickness is smaller than the thickness (0.3 mm) of the base end portion of the overlapping portion 321c, the split core 32 is a convex portion having both end portions in the circumferential direction tapered as shown in FIG. 5a. , And a recess 34 whose width of an opening defined by the core back 321 and the adjacent core back 321 is widened.

  The shape of the corner portion (tip portion of the overlapping portion) 321c 'of the core piece member 32a is not limited to the tapered shape shown in Fig. 7a, and may be the shape shown in Fig. 7b or 7c, for example. That is, the core piece member 32a of FIG. 7b has a corner portion 321c 'whose thickness decreases stepwise from the front surface and the back surface. Further, the core piece member 32a of FIG. 7c has a corner portion 321c 'whose thickness is reduced stepwise from the back surface. The shape of the corner portion (the end portion of the overlapping portion) 321c 'is not limited to that shown in FIG. 7, and for example, the tapered shape of FIG.

  For example, as shown in FIG. 5c, in the case of the core piece member 32a constituting the split core 32 whose stacking direction changes in the first half and the second half, the first and tenth sheets from the bottom and the first and tenth sheets from the top As shown in FIG. 7a, the core piece member 32a has a corner portion 321c 'thinner than the base end portion of the overlapping portion 321c, and the other core pieces 32a are connected to the core back portion 321 as shown in FIG. 7d. The corner portions 321c ′ may have the same thickness. By doing in this way, the magnetic characteristic fall by the process for making thickness thin can be suppressed.

  The coil 4 is formed by winding a plurality of windings 40 by a predetermined winding method. As shown in FIG. 8, the winding 40 constituting the coil 4 is formed of a copper conductor 41 and an insulating coating 42 made of an inner layer 420 and an outer layer 421 that covers the outer periphery of the conductor 41 and insulates the conductor 41. Yes. The thickness of the insulating coating 42 including the inner layer 420 and the outer layer 421 is set between 100 μm and 200 μm.

  As shown in FIG. 9, the coil 4 is formed by two three-phase windings (U1, U2, V1, V2, W1, W2).

  The coil 4 is formed by winding a plurality of windings 40 in a predetermined shape as shown in FIG. The winding 40 constituting the coil 4 is formed in a shape that is wave-wound along the circumferential direction on the inner peripheral side of the stator core 30. A straight slot accommodating portion 44 accommodated in a slot 31 formed in the stator core 30 and a turn portion 45 connecting adjacent slot accommodating portions 44 are provided. The slot accommodating portions 44 are accommodated in the slots 31 for each predetermined number of slots (3 phases × 2 = 6 in the case of the stator of the present embodiment). The turn part 45 is formed so as to protrude from the axial end face of the stator core 30 (see FIG. 2).

  The coil 4 is formed in a state in which a plurality of windings 40 are wound in a wave shape along the circumferential direction with one end portion protruding from an end surface in the axial direction of the stator core 30. One phase of the coil 4 is formed by welding two windings 40 wound in a wave shape along the circumferential direction at the other ends. In the two windings 40, the slot accommodating portion 44 is accommodated in the same slot 31. At this time, the slot accommodating portion 44 of the first winding 40 and the slot accommodating portion 44 of the second winding 40 are installed such that the slot accommodating portions 44 are alternately positioned in the depth direction of the slot 31. ing. The joint 45 between the two windings 40a and 40b is formed in a folded portion 46 including a slot accommodating portion 44 in which the winding direction of the two windings 40 is reversed.

  As shown in a development view in FIG. 11, the coil 4 is formed of a molded body having two winding portions 40a and 40b having different winding directions for each phase (U1, U2, V1, V2, W1, W2). 6 sets are used. Each of the two winding portions 40a, 40b is connected to the end on the neutral point side and the end opposite to the end on the phase terminal side via the slot accommodating portion 44 (folded portion 46). . The method of connecting the windings 40 of each phase is the same.

  The coil 4 is manufactured by forming a developed molded body shown in FIG. 11 and winding the molded body at a predetermined number of turns (for example, 4 times) so that the folded portion 46 is located on the axial center side. As shown in FIG. 10, the manufactured coil 4 is formed in a state in which the slot accommodating portions 44 of the windings 40 of each phase are arranged radially in the radial direction. At this time, the slot accommodating portions 44 arranged in the radial direction are located in a state of being spaced apart in the circumferential direction of the coil 4.

  Next, a method of assembling the divided core 32 shown in FIGS. 4 and 5 in the circumferential direction so that the overlapping portions 321c of the core piece members 32a constituting the divided core 32 are overlapped and assembled to the stator 3 shown in FIG. explain.

  First, a predetermined number of divided cores 32 shown in FIGS. 4 and 5 (24 in the case of the stator of this embodiment) and one coil 4 shown in FIG. 10 are prepared. Next, as shown in FIG. 12 (FIG. 12 schematically shows the connection of three divided cores and the coil 4 is omitted for simplicity), the divided cores are separated from the separated state of FIG. 12a. When 32 is moved in the direction of the arrow from the outer periphery of the coil 4 shown in FIG. 10 toward the axial center of the coil 4 shown in FIG. 10 (axial center O of the stator core 30 (see FIG. 3)), As shown by hatching in FIG. 12b, the thin corner portions (tip portions of the overlapping portions) 321c ′ begin to overlap each other (the thin overlapping portion 321c of the left split core 32 is the thick end of the right split core 32). (See FIG. 5a)). Furthermore, when it is moved in the direction of the arrow, the overlapping area increases as shown in FIG. 12c, and finally half of the core back portion 321 is overlapped as shown in FIG. 12d. As shown in FIG. 6, the core piece member 32a has a substantially parallelogram-shaped core back portion composed of an arcuate outer periphery 321a that forms part of the outer periphery of the stator core 30 and a bottom 321b that faces the side 321a. Since the two cores 321 and the base 321b are separated from each other by a predetermined distance from the two ends of the base 321b and extend in the radial direction, the split core 32 defines one slot 31 with the two teeth 33. A slot 31 is defined between the adjacent split cores 32 in the circumferential direction. From the state of FIG. 12c, the teeth 33 of the split core 32 begin to be inserted between the slot accommodating portions 44 (see FIG. 10) of the coil 4 arranged radially in the radial direction, and into the slot 31 in the state of FIG. 12 (d). The slot accommodating portion 44 of the coil 4 is accommodated, and the assembly is completed.

  When the corner portions 321c ′ in FIG. 12b start to overlap each other, the thickness of the corner portion (tip portion of the overlapping portion) 321c ′ is thinner than the thickness of the base end portion of the overlapping portion 321c of the core back portion 321 (thinner tip). The left and right corners 321c interfere and get caught (the thin overlapping part 321c of the left split core 32 is divided into the right part). It overlaps smoothly without being caught by the thin overlapping portion 321c of the core 32 (see FIG. 5a). Furthermore, since the overlapping region (shaded region) of the core back portion 321 is partitioned by the inclined side 321d, there is no interference in the overlapping process. As a result, the assembly is smooth and easy, and there is no assembly failure.

  Further, in the stator 3 that has been assembled, as shown in FIG. 12d, the corner portion (tip portion of the overlapping portion) 321c ′ is located on the outer peripheral portion of the stator core 30 that faces every other slot 31, It is possible to minimize the influence of the deterioration of the magnetic properties and the increase of the magnetic resistance on the stator 3 due to the thinning of the corner portion (tip portion of the overlapping portion) 321c ′.

  The core piece member 32a is not limited to the shape shown in FIG. 6, but, for example, as shown in FIG. 13, the area of the overlapping region when the core piece member 32a is assembled to the stator core 30 is reduced by increasing the inclination angle of the inclined side 321d. can do. That is, the magnetic characteristics can be controlled simply by changing the inclination angle of the inclined side 321d.

  Moreover, the core piece member and the split core 32 which form the stator core 30 shown in FIG. That is, the core back part 321 of the core piece member 32a has a crank shape as shown in FIG. 15 showing the assembled state, and the upper edge part 321d overlaps (the hatched area in FIGS. 14 and 15). The core piece member 32a of this modified embodiment has a thin tip end portion 321c, but does not have the inclined side 321d like the above-described core piece member. Therefore, as shown in FIG. 15c, the part in the circle interferes during the assembly process. Therefore, in the case of a core piece member that does not have such an inclined side 321d, it is necessary to chamfer the part in the circle that interferes or to rotate the split core during assembly.

  Moreover, the shape of the core back part 321 as shown in FIG. 16 may differ. That is, the core back portion 321 has a substantially rectangular shape, and one corner portion (triangle shown by a dotted line) on the side of the arcuate side 321a forming a part of the outer periphery of the stator core 30 is missing, and the other corner portion has It has the same shape as the defect corner portion and a thin overlapping portion 321c. Therefore, in the case of the core piece member 32a of this modified form, when the divided core 32 is formed and then connected in the circumferential direction, it overlaps with the adjacent core piece member at the overlapping portion 321c, and the side of the core back portion 321 (inclination angle 0 degree) 321d is in contact with the side 321d of the adjacent core piece.

It is sectional drawing of the rotary electric machine of the best form. It is a front view (axial direction view) figure of the stator of the rotary electric machine of the best form. It is a front view (axial direction view) figure of the stator core of the rotary electric machine of the best form. It is a front view of the division | segmentation core of the rotary electric machine of the best form. It is A arrow directional view of FIG. It is a front view of the core piece member which comprises the division | segmentation core shown to FIG.4 and FIG.5. It is a B arrow view of FIG. It is sectional drawing of each phase coil | winding which comprises the coil of the rotary electric machine of the best form. It is a figure which shows the connection of the coil of the rotary electric machine of the best form. It is a perspective view of the coil of the rotary electric machine of the best form. It is an expanded view of the coil of the rotary electric machine of the best form. It is a figure which shows the method of assembling the stator (coil omission) of the rotary electric machine of the best form. It is a partial front view of the stator core of a deformation | transformation form. It is a partial front view of the stator core of a deformation | transformation form. It is a figure which shows the assembly process of the stator core of FIG. It is a front view of the core piece member of a deformation | transformation form. It is a perspective view of the conventional split core. It is a perspective view of the conventional stator core. It is a block diagram which shows the coupling | bonding of the conventional split core. It is a perspective view which shows the other conventional stator core. It is AA sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Rotary electrical machinery 2 ......... Rotor 3 ......... Stator 30. …………………………………………………… Stator Core 31 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slot 32 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Split Core 32a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Core piece member
320 .... Teeth
321 ... Core back
321c ... Overlapping part
321c '... Tip 4 ... Coil

Claims (6)

A split core in which a plurality of core piece members are stacked is disposed over the entire circumference, and a stator core that defines a plurality of slots in the circumferential direction;
A coil assembled in the slot;
In the stator of a rotating electric machine with
At least one of the split cores has an overlapping portion that overlaps the adjacent split core when the stator core is formed,
The rotating electric machine stator, wherein the overlapping portion of at least one of the core piece members constituting the split core is formed such that a thickness of a tip portion thereof is thinner than a thickness of a base end portion.   The stator for a rotating electrical machine according to claim 1, wherein the tip end portion of the overlapping portion of the core piece member is an end portion that begins to overlap when the stator core is formed. The core piece member is
A core back portion that forms a core back formed in the circumferential direction when the stator core is formed;
A teeth portion that protrudes in a radial direction from the core back portion and defines at least a part of the slot;
With
The stator of the rotating electrical machine according to claim 1, wherein the overlapping portion is formed on an outer diameter side of the core back portion.   The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the core piece member is formed of one metal plate or two or more stacked metal plates.   The stator of the rotating electrical machine according to any one of claims 1 to 4, wherein the coil is formed by winding a plurality of phase windings so as to form a wave shape in a circumferential direction of the stator core.   A rotating electrical machine comprising a rotor having different magnetic poles formed in a circumferential direction on an inner circumferential side or an outer circumferential side of a stator of the rotating electrical machine according to claim 1.

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