JP5251384B2 - Laminated core and manufacturing method thereof - Google Patents

Description

  The present invention relates to a laminated motor core formed by laminating electromagnetic steel sheets in a rotating electrical machine such as a motor, and more particularly to a laminated core that prevents the rotation of both end connecting portions and improves productivity. Is.

  A conventional laminated core uses a structure divided for each magnetic pole tooth in order to provide windings with high density. By adopting a structure in which both end portions of the divided laminated core overlap each other in the laminating direction, advantages such as improved positioning in the laminating direction and reduced magnetic resistance can be obtained.

  In addition, by providing an uneven projection as the center of rotation at the overlapping part, the split cores are connected to each other so that they can rotate freely, and the angle between the back yoke parts of the cores is changed when winding the teeth. The space | interval between adjacent teeth parts can be expanded and the space for inserting a winding nozzle and supplying a wire can be ensured.

  In the conventional examples shown in these, the thickness of each laminated plate of the core piece in the connecting portion forming the overlapping portion of the core is uniform with the thickness of each laminated plate of the back yoke portion and the magnetic teeth portion other than the connecting portion. (For example, refer to Patent Document 1).

JP 2000-201458 A (0031 stage, FIG. 5)

  However, in the conventional laminated core, deformation and swelling of the laminated plate forming the core piece are compressed and the lamination between the core pieces is compressed at the time of winding, so that the overlapping portion of the core between adjacent core pieces There is a problem in that the friction of the connecting part forming the joint increases, and the joint-type connecting core (joint wrap core) is difficult to rotate when the posture is deformed due to the winding.

  Further, in the split-type connecting core, there is a problem that it is difficult to insert the connecting portions that are connected by stacking adjacent core pieces when assembled.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a laminated core that can be easily wound and assembled.

The laminated core according to the present invention comprises a core piece for laminating a T-shaped plate comprising a tooth portion and a back yoke portion projecting from the teeth portion in the center direction in an arcuate central portion, and both end portions of the back yoke portion Are alternately provided in the stacking direction for each T-shaped plate, and when the core pieces are arranged in a circumferential shape, the corresponding end portions of the adjacent core pieces are alternately stacked and connected to each other. In addition, a step is provided on the upper surface and the lower surface of the end portion to provide a connecting portion composed of a plurality of connecting plates having a portion thinner than the thickness of the T-shaped plate.

In addition, the method for manufacturing a laminated core according to the present invention includes a tooth portion and a back yoke portion that protrudes in the center direction at an arc-shaped central portion, and includes a connecting portion at an end portion of the back yoke portion. A method of manufacturing a laminated core in which a T-shaped plate is sequentially formed by punching with a mold, and the thickness of the entire or a partial region of the connecting portion is provided by providing steps on the upper and lower surfaces of the connecting portion by pressing. those with more back yoke unit by Ri to thin it pressurization step a.

According to the present invention, by less than the thickness of the thickness of the T-shaped plate of the connecting plate of the core pieces by providing a step on the upper and lower surfaces of the ends of the core pieces, internal strain generated during pressurization In addition, even when there is some deformation or swelling in the laminated sheet of the core pieces, it is possible to easily perform rotation during posture deformation during winding and insertion during assembly.

Hereinafter, various embodiments of a stator for a rotating electrical machine according to the present invention will be described with reference to the drawings.
Embodiment FIG. 1 is a front view showing a configuration of a stator of a rotating electrical machine composed of laminated cores in an embodiment of the present invention, and FIG. 2 is a configuration in which core pieces to be connected in FIG. 1 are arranged linearly. It is a top view which shows a part of. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is an enlarged view of the center connection in FIG.

  In FIG. 1, a stator 100 of a rotating electrical machine including a laminated core according to the present embodiment is configured by connecting a plurality of core pieces in a substantially annular shape. A core piece 50, which is a laminated core, is formed by laminating a T-shaped plate composed of a back yoke portion 1 and a tooth portion 2, and is connected to both ends of the back yoke portion 1 so as to be rotatable as shown in FIG. The connection convex part 4 and the connection recessed part 5 as a connection board which have the connection center part 3 to be performed are provided, and the teeth part 2 protrudes from the center part in the center direction of the annular | circular shape inside.

  As shown in FIG. 3, the core piece 50 includes first laminated plates 50a-1, 50a-2,..., 50a- (n + 1) (n is an integer) and second laminated plates 50b-1, 50b-. 2,..., 50b-n are alternately stacked.

  .., 50a- (n + 1) and the second laminated plates 50b-1, 50b-2,... Corresponding fixing concave portions 6 and fixing convex portions 7 are provided, and are fixed by being press-fitted and caulked during lamination.

  Further, both ends of the back yoke portion 1 of the first laminated plates 50a-1, 50a-2,... 50a- (n + 1) and the second laminated plates 50b-1, 50b-2,. The convex part 4 and the connection recessed part 5 are provided alternately. In each layer of the core piece 51 connected to the core piece 50, the connection recesses 5 and the connection protrusions 4 are alternately provided so as to correspond to the connection protrusions 4 and the connection recesses 5 of each layer of the core piece 50. .

  On both the front and back surfaces of the connecting convex portion 4 of the core pieces 50, 51, a columnar turning concave portion 3a and a rotating convex portion 3b are provided at the position of the connecting central portion 3, and the core pieces 50, The connecting convex portions 4 of the 51 back yoke portions 1 are fitted with a gap therebetween so as to rotate via the rotating concave portion 3a and the rotating convex portion 3b.

  This gap is formed so that the thickness of the connecting convex portion 4 as the connecting portion is smaller than the thickness of the portion excluding the connecting convex portion 4, that is, the thickness of the T-shaped plate composed of the back yoke portion 1 and the tooth portion 2. It is constituted by doing.

  FIG. 4 shows a specific configuration for forming this gap on both the front and back surfaces of the connecting projection 4 of the core pieces 50 and 51. As shown in FIG. 4, a step 8 in the thickness direction is provided on the upper surface of the connecting projection 4 of the core pieces 50, 51 toward the top of the drawing.

  By providing the step 8 on the upper surface of the connecting convex portion 4, a gap can be formed uniformly on both the front and back surfaces of the connecting convex portion 4 of the core pieces 50 and 51. Due to the step 8, the first laminated plates 50a-1, 50a-2,... 50a- (n + 1) and the second laminated layer when rotating with the connection center portion 3 of the core pieces 50, 51 as the rotation center. Friction between the connecting concave portion 5 and the connecting convex portion 4 of the plates 50b-1, 50b-2,... 50b-n can be reduced, and the core piece 50 and the core piece 51 rotate smoothly around the connecting central portion 3. Can move.

  Note that the step 8 is not limited to the upper surface of the connecting convex portion 4, and may be provided on the lower surface or both surfaces as long as a uniform gap can be formed on the upper and lower surfaces of the connecting convex portion 4, and it goes without saying that the same effect can be obtained. .

  In FIG. 4, the range of the depth dimension T1 of the step 8 (= the thickness T2 of each laminated plate of the core pieces 50 and 51—the thickness T3 of each connecting projection 4 = the gap) is 0.005 mm <T1 ≦. It is preferable that it is 0.050. Considering the fitting tolerance, when the depth dimension T1 of the step 8 is 0.005 mm or less, the friction between the connecting convex portion 4 of the core piece 50 and the connecting convex portion 4 of the core piece 51 is increased, and the rotation is started. The effect of.

  In this case, for example, when the wire 23 is wound around the tooth portion 2 by rotating the flyer 22 on which the nozzle 21 is mounted using a winding device 200 shown in FIG. When the posture state of the piece 50 and the core piece 51 is changed from a straight line to a reverse warped state, the rotation is suppressed by friction, and when the frictional force exceeds the capability of the winding device 200, the operation of the device is stopped. Will do.

  On the other hand, if the depth dimension T1 of the step 8 exceeds 0.050 mm, the cross-sectional area of the magnetic path is reduced and magnetic saturation is likely to occur. Therefore, the iron loss increases and the influence on the motor efficiency increases.

  When the controllability of the motor is required, the depth dimension T1 of the step 8 is more preferably in the range of 0.005 mm <T1 ≦ 0.030. When the depth dimension T1 of the step 8 exceeds 0.030 mm, the roundness of the stator decreases due to an increase in rattling, and the influence on the cogging torque increases.

  Next, the manufacturing method of the stator 100 of the rotating electrical machine composed of the laminated core in the embodiment of the present invention will be described. FIG. 6 shows a process of forming one laminated portion of the stator 100 of the rotating electric machine by punching from a steel plate using a press die.

  As shown in FIG. 6, the punching process proceeds in the order of the downward arrow B, and the hatched portion in FIG. 6 represents the punched portion. FIG. 6A shows the first step, FIG. 6F shows the last step, and the view shown in the direction of the left arrow C in the drawing is a fixing composed of the laminated core in the embodiment of the present invention after punching is completed. It is the first laminated plate portion 100-1 (first laminated plates 50a-1, 51a-1,..., (50 + m) a-1) (m is an integer) of the child 100.

  First, in the process of FIG. 6A, a thin steel plate 9 made of a magnetic material such as an electromagnetic steel plate, a circular hole 10 serving as the inner diameter of the stator 100, and a pilot serving as a positioning reference in press working. Hole 11 is punched out. The steel plate 9 has a thickness of 0.2 to 0.5 mm. When one process is completed, the steel plate 9 is conveyed by a predetermined dimension between the pilot holes 11 and proceeds to the next process.

  Subsequently, in the step of FIG. 6B, around the circular hole 10 formed in the steel plate 9, a plurality of slot-shaped holes 12 arranged circumferentially, and further around the slot-shaped hole 12, Circumferentially arranged relief grooves 13 are punched out, and a tooth portion 2 is formed between each slot-shaped hole 12.

  Next, in the step of FIG. 6C, for each formed tooth portion 2, the region that becomes the connecting convex portion 4 of the corresponding back yoke portion 1 has a predetermined depth dimension T <b> 1 of the step 8 shown in FIG. 4. Pressure is applied to obtain a value, and a thin portion is formed.

  FIG. 7 is an enlarged view showing a region of the pressurized connection convex portion 4. When pressure is applied, residual stress due to strain is generated in the region of the connecting convex portion 4, but by providing a relief groove 13 in a part 4 a of the pressure region, strain generated in the material due to the pressure is released and the groove 13 is released. It can be relaxed as a material deformation to reduce the influence on the magnetic properties.

  Subsequently, in the step of FIG. 6D, the end portions of the back yoke portion 1 are separated from each other along the unidirectional boundary of the region of the connecting convex portion 4 to form the cut line 14. FIG. 8 is an enlarged view showing a region of the connecting convex portion 4 in which the cut line 14 is formed.

  For example, the cut line 14 is cut with an oblique punch by cutting and bending (cut bending method), and the cut part is returned to the original position after the punch is lowered, so that there is a gap between the cut line 14 and the cut line 14. Does not occur.

  Next, in the step of FIG. 6E, a fixing recess 6 and a fixing projection 7 for fixing the laminated plates to each other by caulking are provided on the front and back surfaces of the back yoke portion 1 and the teeth portion 2, respectively. Further, on both the front and back surfaces of the region to be the connecting convex portion 4 of the back yoke portion 1, there are provided a rotating concave portion 3a and a rotating convex portion 3b for connecting and rotating the back yoke portions 1 to each other.

  However, in this step, only the first laminated plate (50 + m) a- (n + 1) positioned at the bottom during lamination is provided with the fixing recess 6 and the fixing projection 7, and the rotation recess 3a and the rotation projection 3b. The punching hole 3c is provided at each position (see FIG. 3).

  Next, in the step of FIG. 6F, the first laminated plate portion 100-1 (first laminated plates 50a-1, 51a-1,..., (50 + m) a− of the stator 100 of the rotating electric machine). The outer shape of 1) is punched out. At this time, a part 4a of the pressurizing region 4a of the connecting projection 4 protruding into the escape groove 13 and burrs and burrs generated when the cut line 14 is formed are also cut and removed.

  Similarly, the second laminated plate portion 100-2 (second laminated plates 50a-2, 51a-2,..., (50 + m) a-2) of the stator 100 of the rotating electrical machine is connected to the connecting convex portion. 4 is formed by separating the end portions of the back yoke portion 1 from each other along the boundary in the direction opposite to the first layer of the region 4.

  The second-layer laminated plate portion 100-2 is laminated in an annular state punched on the first-layer laminated plate portion 100-1, and is fixed to the first-layer fixing projection 7 and the second-layer fixing portion. The concave / convex shape with the concave portion 6 is caulked and fixed.

  In the embodiment of the present invention, the above-described steps are repeated so as to obtain a desired number of laminated layers, and the first laminated plate (50 + m) a- (n + 1) having the punched holes 3c is finally laminated and fixed. A stator 100 for a rotating electric machine having a laminated core is obtained.

  As described above, in the present embodiment, since the step 8 is provided on the upper surface of the connecting convex portion 4, a uniform gap can be formed on both the front and back surfaces of the connecting convex portion 4 of the core pieces 50 and 51. The core piece 50 and the core piece 51 can smoothly rotate around the connection center portion 3.

  Even if there is some deformation or swelling in the laminated sheet of core pieces, the rotation is suppressed when the core piece is deformed from a straight line to a reverse warped state due to winding using a winding device, etc. Therefore, the productivity of the laminated core can be improved.

  Further, when the relief groove 13 is provided in the part 4a of the region and the pressure is applied, the strain generated in the material is released and relaxed as the material deformation to the groove 13, so that the generation of residual stress can be suppressed, and the magnetic The influence on the characteristics can be reduced.

  In the present embodiment, the residual stress is reduced by providing the relief groove 13 with respect to the pressure applied to the connecting convex portion 4, but the present invention is not limited to this. Furthermore, you may provide the flexible structure part for relieving the stress to the core side in the outer peripheral side. In this case, the generation of residual stress can be further reduced.

  The flexible structure portion can be formed as a square-shaped flexible structure portion 15 by providing escape grooves 16 arranged circumferentially on the outer peripheral side and a hole 17 therebetween, for example, as shown in FIG.

  Further, in the present embodiment, the step 8 is provided on the entire surface of the connecting convex portion 4, but a step may be partially provided on the connecting convex portion. For example, as shown in FIG. 10, a step 8 is provided only in a circular region 4 b centering on the connection center portion 3 as a region that most affects the generation of friction during rotation, and the other connection protrusions 4 The region 4 c has the same thickness as the back yoke portion 1.

  In this case, friction during rotation can be suppressed by the step 8 of the circular pressure region 4b, and when the core piece is in an annular state by the region 4c having the same thickness as the back yoke portion 1, the stacking direction is increased. Can be suppressed.

  In the present embodiment, the case where the connecting projections 4 of the core pieces 50 and the core pieces 51 are alternately stacked one by one has been described. However, the present invention is not limited to this. As shown in FIG. 11, a plurality of sheets may be overlapped.

  In FIG. 11, the step 8 is provided only on the surface where the connecting projections 4 of the core piece 50 and the core piece 51 overlap. In this case, the part which becomes a thin part can be decreased, and reduction of iron loss and backlash can be aimed at.

  Moreover, although this Embodiment demonstrated the case where the 1st laminated sheet part 100-1 and the 2nd laminated sheet part 100-2 were each stamped out from another steel plate, it is restricted to this. is not.

  As shown in FIG. 12, the lamination may be repeated by punching out the first laminated plate portion 100-1 and the second laminated plate portion 100-2 from one steel plate 18. The process of FIGS. 12A to 12A is the same as the process of FIGS. 6A to 6C, and a description thereof will be omitted.

  In the step of FIG. 12D, the cut line 14 is formed along the boundary in one direction of the region of the connecting convex portion 4 for forming the first laminated plate portion 100-1. 12 (d), in which the cut line 14 is formed along the boundary in the direction opposite to the first layer in the region of the connecting convex portion 4 for forming the first layer and the second layer laminated plate portion 100-2. Step 2 is performed continuously.

  In the step of FIG. 12 (e), a fixing recess 6 and a fixing projection 7, and a turning recess 3a and a turning projection 3b are provided (FIGS. 12 (d) -1 and 12 (d)). -2).

  In the step of FIG. 12F, the first-layer laminated plate portion 100-1 and the second-layer laminated plate portion 100-2 are continuously punched, and are subsequently laminated and fixed.

  In the embodiment of the present invention, the above-described steps are repeated so as to obtain a desired number of laminated layers, and the first laminated plate (50 + m) a- (n + 1) having the punched holes 3c is finally laminated and fixed. A stator 100 for a rotating electric machine having a laminated core is obtained.

  In this case, since the first laminated plate portion 100-1 and the second laminated plate portion 100-2 are laminated and fixed continuously from one steel plate 18, a series of operations are performed in one press machine. A process can be advanced and productivity can be improved.

  Moreover, although this Embodiment demonstrated the case of the joint type connection core (joint wrap core) which provided the recessed part 3a for rotation and the convex part 3b for rotation in the front and back both surfaces of the connection convex part 4 of the core pieces 50 and 51. FIG. A step 8 may be provided on the connecting convex portion 4 of the split connecting core.

  In this case, in assembling the split-type connecting core, when connecting the connecting projections of adjacent core pieces to each other, the connecting projections can be easily inserted into the corresponding connecting recesses.

It is a top view which shows the structure of embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a top view which shows a part of structure which has arrange | positioned the core piece in linear form in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is sectional drawing which shows a part of structure in the connection part of the core piece in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a cross-sectional enlarged view which shows a part of structure in the connection part of the core piece in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a schematic diagram which shows an example of the winding process in the coil | winding apparatus in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a top view which shows the formation process by press punching in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is an enlarged plan view which shows the pressurization part in the formation process by the press punching in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is an enlarged plan view which shows the pressurization part in the formation process by the press punching in embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is an enlarged plan view which shows the pressurization part in the formation process by the press punching in other embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a top view which shows a part of structure which has arrange | positioned the core piece linearly in other embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a cross-sectional enlarged view which shows a part of structure in the connection part of the core piece in other embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a top view which shows the formation process by the press punching in other embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention. It is a cross-sectional enlarged view which shows a part of structure in the connection part of the core piece in other embodiment of the stator of the rotary electric machine which consists of a laminated core which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back yoke part 2 Teeth part 3 Connection center part 3a Turning concave part 3b Turning convex part 4 Connecting convex part 8 Step 13 Relief groove 15 Flexible structure part 50, 51 Core piece 50a-1, 50a-2, ..., 50a -(N + 1) 1st laminated board 50b-1, 50b-2, ..., 50b-n 2nd laminated board 100 Stator of rotary electric machine

Claims (6)

A core piece for stacking a T-shaped plate composed of a teeth portion and a back yoke portion projecting the teeth portion in the central direction at an arc-shaped central portion;
A T-shape in which both ends of the back yoke portion are alternately provided in the stacking direction for each T-shaped plate, and corresponding end portions of adjacent core pieces are stacked when the core pieces are arranged circumferentially. A laminated core comprising a plurality of connecting portions each having a plurality of connecting plates each having a portion thinner than the thickness of the T-shaped plate by providing a step on the upper surface and the lower surface of the end portion .   The connecting portion is provided with a turning recess and a turning projection on the front and back surfaces of the central portion of the connecting plate, respectively, and the corresponding turning recess and turning projection of the connecting plate overlapped when adjacent core pieces are connected. The laminated core according to claim 1, wherein the laminated core is loosely fitted, and is rotated around the rotation concave portion and the rotation convex portion.   The laminated core according to claim 1 or 2, wherein the connecting plate partially provides a region having a thickness equivalent to that of the T-shaped plate. A teeth portion and a back yoke portion projecting in the center direction at the center portion of the arc shape, and a T-shaped plate having a connecting portion at the end of the back yoke portion are sequentially punched by a die. a method of manufacturing a laminated core forming, the connection portion of the upper surface and the thickness of the connecting portion the entire area or a partial area by providing a step on the lower surface the back yoke unit by Ri to thin it pressurized by pressure A method for producing a laminated core comprising a pressing step.   5. The method for manufacturing a laminated core according to claim 4, further comprising a step of forming a relief groove for urging material deformation in a surface direction due to pressurization at an end of a region to be pressed before the pressurizing step.   The lamination according to claim 4 or 5, further comprising a step of forming a flexible structure portion that relaxes material deformation in the surface direction due to pressurization in the vicinity of a region to be pressed before the pressurizing step. Core manufacturing method.

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