JP6232641B2 - Manufacturing method of stator core - Google Patents

Description

  The present invention relates to a method for manufacturing a stator core.

  A stator in a rotating electrical machine such as a motor includes a stator core composed of a substantially cylindrical yoke portion and a plurality of teeth portions projecting radially toward the outer peripheral side or inner peripheral side of the yoke portion. It is comprised from the coil which winds a coil | winding around the teeth part. The stator core is manufactured by laminating a plurality of electromagnetic steel sheets having shapes corresponding to the yoke part and the tooth part in the axial direction of the stator, and the stator core is formed after the stator core is formed. It is manufactured by winding a winding around the tooth portion.

  In the manufacture of stators, it is troublesome to form a coil by winding the winding around the teeth of the stator core. In particular, it takes time to wind the winding around multiple teeth at a high space factor. Will be applied. As a technique that can reduce the labor of forming a coil by winding a winding around such a tooth portion, a configuration in which a stator core is divided into a predetermined shape can be mentioned.

  As the split structure stator core, for example, a split structure stator core in which a yoke part and a tooth part are divided, that is, a fixed structure in which a plurality of teeth are assembled on the outer peripheral side or inner peripheral side of a substantially cylindrical yoke. There is a child core (for example, Patent Document 1), and other examples include a stator core having a divided structure in which the stator core is divided in the circumferential direction, that is, a substantially arc-shaped yoke portion and an outer peripheral side of the yoke portion or There is a stator core formed by assembling a split iron core integrally provided with a teeth portion extending toward the inner peripheral side in the circumferential direction.

  A stator core having a divided structure is formed by laminating a plurality of electromagnetic steel sheets having a predetermined divided shape to form a plurality of divided laminates, and assembling the plurality of divided laminates. For example, by forming protrusions for assembly and groove portions for assembly on electromagnetic steel sheets having a predetermined split shape, a plurality of divided laminates in which a plurality of the electromagnetic steel sheets are stacked can be respectively assembled. .

  In the manufacture of a stator core having such a divided structure, if the projections and grooves for assembly formed on the electromagnetic steel sheet have the same dimensions, the projections and grooves for assembly will interfere with each other. The assembly work of the body becomes very difficult. Therefore, the assembly protrusions and grooves formed on the electromagnetic steel sheet have different dimensions, that is, the assembly grooves formed on the electromagnetic steel sheet are made larger than the assembly protrusions, thereby assembling the divided laminated body (for assembly). Therefore, when assembling the divided laminated body, the assembling work can be facilitated without interference between the assembling protrusion and the groove.

Japanese Patent Laid-Open No. 2002-199666

  However, the gap in the assembly portion of the divided laminated body can facilitate the work (assembly work) at the time of assembly, but becomes loose in the stator core after assembly. In a rotating electrical machine provided with a stator core having such an assembly backlash, there is a risk that an increase in vibration noise, damage to members, and the like due to the assembly backlash may occur.

  In addition, when manufacturing magnetic steel sheets, by forming the projections and grooves for assembly with predetermined dimensions, it is possible to facilitate the assembly work between the divided laminates and reduce the assembly play of the stator core. it can. However, in this manufacturing method, the ease of assembling work and the size of the assembling backlash are easily affected by manufacturing errors when manufacturing the electrical steel sheet, so the accuracy of the electrical steel sheet, that is, the tolerance must be strictly controlled. This increases the manufacturing cost.

  The present invention has been made in view of the above problems, and it is an object of the present invention to facilitate the assembling work between divided laminated bodies and reduce the assembling backlash in a stator core having a divided structure.

  The manufacturing method of the stator core according to the first invention that solves the above-described problems is achieved by inserting the protrusion for assembly formed in the second component member into the groove for assembly formed in the first component member. A stator core manufacturing method for assembling the first component member and the second component member constituting a split structure stator core, wherein the width of the protrusion in the second component member is the first component member. A curved portion is formed in the second component member so as to be smaller than a width of the groove portion in the second component member, and the second component is inserted into the groove portion in the first component member after the protrusion is inserted into the groove portion in the first component member. Pressure is applied to the second component member such that the width of the protrusion in the member is increased.

  A method for manufacturing a stator core according to a second invention for solving the above-described problem is the method for manufacturing a stator core according to the first invention, wherein the second component member is formed by laminating a plurality of electromagnetic steel sheets. It is characterized by being.

  A method for manufacturing a stator core according to a third aspect of the present invention for solving the above-described problem is the method for manufacturing a stator core according to the second aspect, wherein the bending portion is formed by punching the electromagnetic steel sheet into a predetermined shape. It is characterized by being formed.

  A method for manufacturing a stator core according to a fourth aspect of the present invention for solving the above-described problem is the method for manufacturing a stator core according to any one of the first to third aspects, wherein the pressure is the first component member and The second component member is added by mechanical fastening means via support members arranged on both sides in the axial direction.

  A method for manufacturing a stator core according to a fifth aspect of the present invention for solving the above-described problem is the method for manufacturing a stator core according to any one of the first to fourth aspects, wherein the first component member has a substantially cylindrical shape. The second component member is a tooth assembled so as to extend radially toward the outer peripheral side or the inner peripheral side of the yoke.

  According to the method for manufacturing a stator core according to the first invention, the curved portion is formed in the second constituent member so that the width of the protrusion in the second constituent member is smaller than the width of the groove in the first constituent member. Since the protrusion of the second component is inserted into the groove of the first component, the width of the protrusion of the second component is smaller than the width of the groove of the first component. The first component member and the second component member can be easily assembled without interference between the groove portion and the groove portion of the first component member. In addition, since the protrusion of the second component is increased after the protrusion of the second component is inserted into the groove of the first component, the first component and the second component without causing assembly play. The member can be assembled.

  According to the method for manufacturing a stator core according to the second aspect of the invention, the second constituent member is configured by laminating a plurality of electromagnetic steel sheets, thereby easily curving a thin electromagnetic steel sheet. A curved portion can be formed.

  According to the method for manufacturing a stator core according to the third invention, the bending portion is formed when the electromagnetic steel sheet is punched into a predetermined shape, thereby increasing the number of steps in manufacturing the stator core. There is no need to let them.

  According to the method for manufacturing a stator core according to the fourth invention, the pressure is applied by the mechanical fastening means via the support members disposed on both sides in the axial direction of the first component member and the second component member. Thus, the assembling work can be easily performed, and the structure of the stator core can be simplified.

  According to the method for manufacturing a stator core according to the fifth invention, the first component member is a substantially cylindrical yoke, and the second component member extends radially toward the outer peripheral side or the inner peripheral side of the yoke. As a result of the assembled teeth, the yoke and teeth can be easily assembled in the manufacture of a stator core with a split structure in which a plurality of teeth are assembled on the inner peripheral side of a cylindrical yoke, resulting in assembly backlash. The yoke and the teeth can be assembled without causing them.

It is a fragmentary longitudinal cross-section (equivalent to II arrow sectional drawing in FIG. 3) which shows the stator in the middle of manufacture manufactured using the manufacturing method of the stator core which concerns on Example 1. FIG. It is a fragmentary longitudinal cross-section (II arrow directional cross-sectional view in FIG. 3) which shows the stator manufactured using the manufacturing method of the stator core which concerns on Example 1. FIG. It is a fragmentary longitudinal cross-sectional view (II-II arrow sectional drawing in FIG. 3) which shows the stator manufactured using the manufacturing method of the stator core which concerns on Example 1. FIG. It is a cross-sectional view which shows the stator manufactured using the manufacturing method of the stator core which concerns on Example 1. FIG. It is a top view which shows the electromagnetic steel plate for the teeth of the stator manufactured using the manufacturing method of the stator core which concerns on Example 1. FIG. It is a side view which shows the electromagnetic steel plate for the teeth of the stator manufactured using the manufacturing method of the stator core which concerns on Example 1. FIG.

  Embodiments of a method for manufacturing a stator core according to the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, a stator core manufacturing method according to the present invention is divided into a stator core having a split structure in which a plurality of teeth (split laminate) are assembled on the inner peripheral side of a cylindrical yoke (split laminate), and This is applied to manufacture of a stator having the stator core. Needless to say, the present invention is not limited to the following examples, and various modifications can be made without departing from the spirit of the present invention.

  A structure of a stator core manufactured using the method for manufacturing a stator core according to Example 1 of the present invention and a stator including the stator core will be described with reference to FIGS. 1A to 4B. In FIG. 1A to FIG. 4B, in order to facilitate understanding of the manufacturing method of the stator core in the present embodiment, the curvature radius of the curved portion in the electromagnetic steel sheet in the curved state is exaggerated.

  As shown in FIG. 3, the stator 1 in the present embodiment includes a substantially cylindrical yoke 10 (first constituent member) and a plurality (eight in the present embodiment) assembled radially on the inner peripheral side of the yoke 10. ) Of the teeth 20 (second constituent member) and a coil 40 formed by winding a winding 40a around the teeth 20 of the stator core 30.

  As shown in FIGS. 2 and 3, the yoke 10 is formed by laminating a plurality of yoke electromagnetic steel plates 11 having an annular shape in the axial direction of the stator 1 (vertical direction in FIG. 2). In the electromagnetic steel sheet 11 for yoke, an assembly groove portion 13 for assembling the teeth 20 is formed on the inner peripheral side of the annular main body portion 12.

  The teeth 20 are formed by laminating a plurality of electromagnetic steel plates 21 for teeth having a flat plate shape in the axial direction of the stator 1. Assembling for assembling the yoke 10 and the teeth 20 to the electromagnetic steel sheet 21 for teeth, the assembling protrusion 22 for assembling to the yoke 10, the teeth 23 for winding the winding 40a to form the coil 40, A bolt insertion hole 24 for inserting a bolt 50 (see FIG. 2) is formed. The teeth 20, that is, the electrical steel sheet 21 for teeth, is formed in an arc shape so that the inner peripheral surface faces the peripheral surface of the rotor (not shown).

  As shown in FIGS. 4A and 4B, the electrical steel sheet 21 for teeth is curved so that a ridge line is formed along the radial direction of the stator 1 (vertical direction in FIG. 4A) before assembly (curved). Part is formed) in a bent state (teeth electromagnetic steel plate 21b shown by a solid line in FIGS. 4A and 4B), and when assembled, from the bent state to a flat state (teeth electromagnetic wave shown by a two-dot chain line in FIGS. 4A and 4B) The steel plate 21a) can be deformed.

And the width (length in the circumferential direction of the stator 1) B _22a of the assembly protrusion 22 in the electromagnetic steel sheet 21a for teeth in the flat state is set to the width (length in the circumferential direction of the stator 1) of the assembly groove portion 13 of the yoke 10. ) The width of the assembly protrusion 22 in the curved electromagnetic steel plate 21b (length in the circumferential direction of the stator 1) B _22b is approximately the same length as B ₁₃ and the width of the assembly groove 13 of the yoke 10 and is curved so as to be smaller than (the circumferential length in the direction of the stator 1) B ₁₃ (see FIG. 3, 4A and 4B).

Therefore, when the electrical steel sheet 21 for teeth is in a curved state, the width B _22b of the assembly protrusion 22 of the electrical steel sheet 21b for teeth is smaller than the width B ₁₃ of the assembly groove 13 of the electromagnetic steel sheet 11 for yoke. And the teeth 20 can be assembled easily without interfering with each other.

  In this example, the electrical steel sheet 21 for teeth is punched from a flat base material by a not-shown pressing machine and then bent by a not-shown pressing machine to obtain a predetermined size as shown in FIGS. 4A and 4B. It has a tile shape. Of course, the electrical steel sheet according to the present invention is not limited to this, and may be formed into a tile shape having a predetermined dimension by being punched after being bent. It is good also as a tile shape of a size.

  As shown in FIG. 2, both ends in the axial direction (upper ends in FIG. 2) in a state where a plurality of electromagnetic steel sheets 11 for yokes and electromagnetic steel sheets 21 for teeth are stacked in the axial direction of the stator 1 (vertical direction in FIG. 2). And an end ring 60 as a support member having an annular shape of the same size as that of the electromagnetic steel plate 11 for the yoke, and the assembly bolt 50 and the assembly nut 51 as mechanical fastening means. The electromagnetic steel plate 11 for teeth and the electromagnetic steel plate 21 for teeth are fastened. The electrical steel sheet 21 for teeth is in a flat state (state used as the stator 1) by the fastening force (pressure) of the assembly bolt 50 and the assembly nut 51 (see FIG. 1B).

The width B _22a of the assembly protrusion 22 in the electrical magnetic steel sheet for teeth 21a in the flat state is formed with substantially the same size as the width B ₁₃ of the assembly groove 13 of the electromagnetic steel sheet for yoke 11 (FIGS. 3 and 4A). And FIG. 4B). Therefore, when the yoke 10 and the teeth 20 are assembled and the electrical steel sheet 21 for teeth is in a flat state, the width B _22a of the assembly projection 22 of the electrical steel sheet 21a for teeth is the width of the assembly groove 13 of the electromagnetic steel sheet 11 for yoke 11. Since it is substantially the same as the width B ₁₃ , no assembly play occurs in the assembly of the yoke 10 and the teeth 20 (see FIG. 1B).

  A procedure for assembling the yoke 10 and the teeth 20 using the method for manufacturing a stator core in the present embodiment will be described with reference to FIGS. 1A to 3.

First, the yoke 10 is formed by stacking the electromagnetic steel sheets 11 for the yoke, and the teeth 20 are formed by stacking the electromagnetic steel sheets 21 for the teeth (see FIG. 1A). The assembly protrusion 22 of the teeth 20 is inserted into the assembly groove 13 formed in the yoke 10 (see FIGS. 1A and 3). At this time, the electrical steel sheet 21 for teeth has a tile shape that is curved so that a ridge line along the radial direction of the stator 1 is formed, and therefore, the width B of the assembly groove portion 13 in the assembly portion of the yoke 10 and the teeth 20. ₁₃ and the width B _22b of the assembling protrusion 22 are different in the curvature of the teeth 20, that is, on both sides of the assembling protrusion 22 of the teeth 20 with respect to the assembling groove 13 of the yoke 10 (left and right sides in FIG. 1A) A gap d is created for each.

  Therefore, when the assembly protrusion 22 of the tooth 20 is fitted into the assembly groove portion 13 of the yoke 10, the yoke 10 and the tooth 20 do not interfere with each other, and it takes time and labor to assemble the yoke 10 and the tooth 20. Absent. Of course, the electrical steel sheet 21 for teeth may be divided into one or more, and the assembly protrusions 22 of the electrical steel sheet 21 for teeth may be sequentially inserted into the assembly groove 13 of the yoke 10.

  Next, end rings 60 are disposed at both ends of the yoke 10 and the teeth 20 in the axial direction, and the assembly bolts 50 are inserted from one side into the bolt insertion holes 61 formed in the end ring 60 and the bolt insertion holes 24 formed in the teeth 20. At the same time, the assembly nut 51 is screwed into the tip 50a of the assembly bolt 50 protruding to the other side (see FIGS. 1A and 2).

The assembly bolt 50 and the assembly nut 51 are tightened with a predetermined fastening force so that the end ring 60 is in contact with both end faces 14 of the yoke 10, that is, the teeth 20 are changed from a curved shape to a flat shape, and the width B of the assembly protrusion 22. _An axial pressure is applied to the teeth 20 so that _22a becomes large (see FIG. 1B).

When the teeth 20 are deformed from the curved state to the flat state by the fastening force of the assembly bolt 50 and the assembly nut 51, the width B _22a of the assembly protrusion 22 of the teeth 20 (the electrical steel plate 21a for teeth) is assembled to the yoke 10. A stator core 30 having substantially the same width B _{13 as the} groove 13 and having no assembled play, that is, the stator 1 including the stator core 30 can be manufactured (see FIGS. 3, 4A, and 4B).

When the width B _22a of the assembly protrusion 22 in the electrical magnetic steel sheet 21a for teeth in the flat state is formed to be larger than the width B ₁₃ of the assembly groove 13 of the electromagnetic steel sheet 11 for yoke, the electrical steel sheet 21 for teeth is When deformed from the curved state to the flat state, the assembly protrusion 22 of the electrical steel sheet for teeth 21 comes into close contact with the assembly groove 13 of the electromagnetic steel sheet for yoke 11, so that the electromagnetic steel sheet for yoke 11 and the electromagnetic for teeth Bonding strength with the steel plate 21 can be obtained.

  Therefore, for example, after the assembly protrusion 22 of the electrical steel sheet 21 for teeth is arranged in the assembly groove 13 of the electrical steel sheet 11 for yoke 11, pressure is applied to the electrical steel sheet 21 for teeth from both sides in the axial direction of the stator core 30 with a press or the like. Accordingly, the yoke electrical steel sheet 11 and the teeth electrical steel sheet 21 can be assembled without using the assembly bolt 50 and the assembly nut 51 as mechanical fastening means as in this embodiment.

In addition, the shape of the electrical steel sheet in the present invention is not limited to the tile shape like the electrical steel sheet 21 for teeth in the present embodiment, and it is sufficient that the assembly work between the yoke 10 and the teeth 20 can be facilitated. That is, as in the present embodiment, without bending the entire electrical steel sheet 21 for teeth, for example, the width B _22b in the circumferential direction of the assembly protrusion 22 is the width in the circumferential direction of the assembly groove part 13 of the electromagnetic steel sheet 11 for yoke. A curved portion may be formed in the electrical steel sheet 21 for teeth so as to be smaller than B ₁₃ , that is, only the protrusions 22 may be curved with the teeth part 23 of the electrical steel sheet 21 for teeth flat.

  The manufacturing method of the stator core according to the present invention is limited to the manufacturing method of the stator core 30 having a divided structure in which the teeth 20 are assembled on the inner peripheral side of the cylindrical yoke 10 as in this embodiment. Alternatively, the present invention may be applied to the manufacture of a stator core having a split structure in which a split iron core having an arc-shaped yoke portion and a tooth portion integrally assembled is assembled in the circumferential direction.

  That is, when the method for manufacturing a stator core according to the present invention is applied to the manufacture of a stator core having a split structure in which a split core having an arc-shaped yoke portion and a teeth portion is integrally assembled in the circumferential direction. Forming an assembling protrusion and an assembling groove on the split iron core, and curving the assembling protrusion on the split iron core so that the width of the assembling protrusion is smaller than the width of the assembling groove, thereby forming a curved portion in the circumferential direction. By applying pressure to the divided iron core after assembling the divided iron core, it is possible to obtain the same effects as in the present embodiment.

1 Stator 10 Yoke (first component)
11 Magnetic Steel Sheet for Yoke 12 Main Body of Magnetic Steel Sheet for Yoke 13 Assembly Groove of Magnetic Steel Sheet for Yoke (Groove for Assembly)
14 End face of yoke 20 Teeth (second component)
21 Electrical Steel Sheet for Teeth 22 Assembly Protrusion of Magnetic Steel Sheet for Teeth (Protrusion for Assembly)
23 Teeth part of electrical steel sheet for teeth 24 Insertion hole 30 of electrical steel sheet for teeth 30 Stator core 40 Coil 50 Assembly bolt (mechanical fastening means)
50a Tip of assembly bolt 51 Assembly nut (mechanical fastening means)
60 End ring (support member)

Claims (5)

The first component member and the second component constituting the split structure stator core by inserting the assembly protrusion formed in the second component member into the assembly groove portion formed in the first component member. A method for manufacturing a stator core for assembling members,
A curved portion is formed in the second component member such that a width of the protrusion in the second component member is smaller than a width of the groove portion in the first component member, and the protrusion in the second component member is A method of manufacturing a stator core, comprising: applying pressure to the second component member so that a width of the protrusion in the second component member is increased after being fitted into the groove portion in the first component member. The method for manufacturing a stator core according to claim 1, wherein the second component member is configured by laminating a plurality of electromagnetic steel plates. The method for manufacturing a stator core according to claim 2, wherein the curved portion is formed when the electromagnetic steel sheet is stamped and formed into a predetermined shape. The said pressure is applied by a mechanical fastening means via the supporting member distribute | arranged to the axial direction both sides in said 1st structural member and said 2nd structural member. The manufacturing method of the stator core as described in any one of Claims. The first component member is a substantially cylindrical yoke;
5. The fixing according to claim 1, wherein the second component member is a tooth that is assembled so as to extend radially toward the outer peripheral side or the inner peripheral side of the yoke. A manufacturing method of a child iron core.

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