JP2008306854A - Stator of rotary electric machine and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a high performance stator of a rotary electric machine by employing an outer winding system of high productivity and a high performance open teeth structure for enhancing the output characteristics of a rotary electric machine. <P>SOLUTION: In the stator 1 of a rotary electric machine, each of the teeth 12a is divided by loading a force radially outward of the central side of annular teeth 11. Since a force is loaded radially outward of the central side of annular teeth 11, a cut line 16 on the yoke side of the teeth 12a is extended in the circumferential direction by the recess 24 of the yoke and the teeth 12a is thus fitted in the yoke 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  In order to increase the efficiency of the rotating electrical machine, it is effective to make the stator open slot. However, when the stator is made into an open slot, there is a problem that winding becomes difficult and productivity is lowered and cost is increased. On the other hand, the outer winding method, in which winding is performed from the outside of the stator, is highly productive and effective in reducing costs. However, the efficiency of the rotating electrical machine is reduced by closed slots, and the teeth and yoke are joined after winding. There is a problem. Further, compared with a round coil, a square coil can theoretically increase the space factor, but winding is a difficult problem.

  In Patent Document 1, four teeth are handled in a state where a tooth assembly is integrally formed of four teeth pieces and a connecting steel plate, and finally, the connecting steel plate is punched in the thickness direction by a press. We are trying to improve.

  In Patent Document 2, a semicircular convex portion having a constricted portion on both sides of a tooth fitting portion, a first inclined portion whose one end side is continuous with each constricted portion, and a tooth side fitting from the other end side of each first inclined portion. A first linear portion formed on the side end portion of the portion, and the yoke-side fitting portion includes a semicircular concave portion formed in the central portion, a protrusion having elasticity and formed on both sides of the semicircular concave portion, and A second inclined portion that is continuously formed on the protrusion and a second linear portion that is continuously formed on each second inclined portion are fitted.

JP-A-5-253701 JP 2004-320824 A

  In the teeth dividing method of Patent Document 1, when the connecting steel plate is thin, or when the aspect ratio of the stacking direction of the teeth with respect to the width of the teeth is large, problems such as insufficient rigidity during winding and deformation of the stator occur. There are concerns about this, and the number of applicable stator structures is limited, such as the number of teeth in the circumferential direction and the axial length of the rotating electrical machine.

  In addition, the coupling method between the teeth and the yoke of Patent Document 2 is intended for a coil wound around a bobbin. When a distributed winding method in which the coil is directly wound around the teeth portion is adopted, the fitting portion between the teeth and the yoke is the teeth. There is concern that the space factor cannot be increased because it is near the center of the radial direction.

  The present invention has been made in view of these points, and an object thereof is to provide a method for manufacturing a stator of a rotating electrical machine at high performance and at low cost.

  In the method of manufacturing a stator for a rotating electrical machine according to the present invention that achieves the above-described object, the annular teeth are integrated in the winding step, and a force is applied to the outside of the annular teeth from the radially inner side after the winding step. Thus, it is divided into each tooth to form an open slot structure. Here, the annular teeth do not have to be all on the same surface, and may be spirally connected.

  In the fitting portion between the teeth and the yoke of the stator of the rotating electric machine, the stator stator has a Y-shape with a radial cut on the radially outer side of the teeth stator. It has a fan-shaped recess centered on the center side and a convex shape in the center direction of the stator at the center of the fan-shaped recess, and by pushing the tooth cut into the convex portion of the yoke, The Y-shape of the teeth is spread by the convex portion of the yoke, the Y-shaped portion is plastically deformed, and the compressive force between the end surface on the outer side in the circumferential direction of the tooth Y-shaped portion and the end surface on the inner side in the yoke sector shape The teeth and the yoke are fitted together.

  Further, the division of the annular teeth and the fitting of the teeth and the yoke are performed in the same process.

  In the winding process, the coil is a round wire, and a force is applied to the outside of the annular tooth from the inside in the radial direction, and the coil is plastically deformed after winding to change the cross-sectional shape. The coil cross section after plastic deformation is preferably a rectangular shape, but is not necessarily a rectangular shape.

  In the division of the annular teeth and the engagement between the teeth and the yoke, for example, the rod-shaped taper is formed by using a tool having a taper on the rod-shaped outer side and a tool having a taper corresponding to the taper on the ring-shaped inner side. A force is applied to the teeth outward in the radial direction of the stator by pushing the tool having the ring-shaped inner side in the axial direction of the tool having a taper inside to expand the ring in the radial direction.

  Further, in the division of the annular teeth and the engagement of the teeth and the yoke, for example, by pushing a blade-shaped tool radially outward into the divided portion of the annular teeth, the teeth are directed outward in the radial direction of the stator. To put power on. As an example, the blade-like tool is provided inside the annular tooth by using a tool having a taper in the axial direction of the cylinder and having a blade tip of the blade-like tool arranged in the circumferential direction in a plane passing through the axis of the cylinder. There is a method in which the blade shape is pushed in the axial direction after arranging the shafts so as to align the shaft centers.

  Before the annular teeth are divided, at least one of the radially outer side and the inner side of the stator of the rotating electric machine is cut into the portion where the annular teeth are divided. It is preferable to make a notch on the radially outer side.

  As described above, according to the present invention, in the manufacture of a stator of a rotating electrical machine, a highly productive outer winding method can be adopted, and a high-performance open teeth structure that can improve the output characteristics of the rotating electrical machine is achieved. can do. Further, teeth that are cut in the radial direction of the stator on the radially outer side of the stator have a fan shape centered on the center side of the stator and a convex shape in the center direction of the stator at the center of the fan shape. The Y-shaped portion is plastically deformed by being pushed into the yoke, and the teeth and the yoke are fitted with a compressive force between the circumferentially outer end surface of the teeth Y-shaped portion and the yoke fan-shaped circumferentially inner end surface. Thus, the gap between the teeth and the yoke is reduced, and the output characteristics of the rotating electrical machine can be improved.

  Further, since the division of the annular teeth and the fitting of the teeth and the yoke are performed by the outward force in the stator radial direction on the teeth, the division of the annular teeth and the fitting of the teeth and the yoke are the same. It can be performed in the process, and the cost can be reduced by reducing the man-hours.

  It is a round wire coil that can be easily wound in the winding process, and the space factor can be increased by bringing the coils into close contact by changing the cross-sectional shape after winding, which improves the output characteristics of the rotating electrical machine. Is possible.

  Using a tool having a taper on the outer side of the rod and a tool having a taper corresponding to the taper on the inner side of the ring, the tool having the taper of the rod is changed in the axial direction of the tool having the taper on the inner side of the ring. By pushing into the ring, it is possible to apply a force to the teeth outward in the radial direction of the stator by expanding the ring in the radial direction.

  In addition, using a tool having a taper in the axial direction of the cylinder and having the cutting edge of the blade-shaped tool disposed in the circumferential direction in a plane passing through the axis of the cylinder, the blade-shaped tool is centered on the inner side of the annular tooth. After arranging in an aligned form, the blade shape can be pushed into the axial direction to be locally deformed into the divided portion of the annular teeth, and the amount of radial displacement for dividing the annular teeth can be reduced. it can.

  A radius for dividing the annular teeth by dividing a portion of the annular teeth into at least one of the outer side and the outer side in the radial direction of the stator of the rotating electric machine before dividing the annular teeth. The amount of displacement in the direction can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 4 relate to the first and second embodiments of the present invention, FIG. 1 is a diagram viewed from a plane perpendicular to the axis of the stator before the main processing, FIG. 2 is an external perspective view thereof, FIG. FIG. 4 is a view seen from a surface perpendicular to the axial direction of the stator after the main processing, and FIG. 4 is an external perspective view thereof. For convenience, a tool for applying a force to the outside of the coil and the annular teeth in the radial direction is omitted. An annular tooth 11 provided with a notch 13 between the teeth 12a is arranged inside the yoke 21, and a radial outward force 31 is applied from the center side of the annular tooth 11, so that each tooth 12b is divided. A space 14 is provided between the teeth 12b to form the stator 1 having an open slot structure.

  The notch 13 at this time does not necessarily need to be from the outside of the annular teeth, but may be from the inside of the annular teeth or from the outside and inside of the annular teeth.

  Further, a slit 16 is formed in the radial direction outer side 15 of the stator of the teeth 12a in the radial direction of the stator to form a Y-shape 17, and the yoke 21 has a sector 22 centered on the center side of the stator and the sector. The outer center 23 has a convex shape 24 in the center direction of the stator. Here, by applying a radially outward force 31 from the inside of the annular tooth 11, the yoke-side cut 16 of the tooth 12 a is expanded in the circumferential direction by the convex portion 24 of the yoke, and the notch 17 of the tooth 17. Is deformed plastically, and the end surface 18 on the outer side in the circumferential direction of the teeth Y-shaped portion 17 and the end surface 25 on the inner side in the yoke sector shape are brought into contact with each other.

  1 to 4, for convenience, the division of the annular teeth 11 and the fitting of the teeth 11 and the yoke 21 are performed in the same process, but the division of the annular teeth 11 and the fitting of the teeth 11 and the yoke 21 are not necessarily the same process. It does not have to be.

  8 and 9 show one slot of a cross section perpendicular to the alternator axial direction, FIG. 10 is a cross section in which a round wire coil is wound, and FIG. 11 is a coil in which a force is applied to the outside of the annular tooth from the inside in the radial direction. It is the figure which made plastic deformation and made the cross-sectional shape square-shaped. The coil 91a after winding has a round cross-sectional shape, but a force is applied to the outside of the annular tooth 12a from the inside in the radial direction to make the coil cross-section a rectangular shape 91b. The coil cross section after plastic deformation is preferably a rectangular shape, but is not necessarily a rectangular shape.

  FIG. 5 shows a method of applying a force from the center side of the annular tooth 11 using a taper tool. A set of a tool 41 having a taper 43 on the outside of the rod-like 42 and a tool 51 having a taper 53 on the inside of the ring-like 52, and pushing the rod-like taper tool 41 in the axial direction of the ring-like taper tool 51, The axial displacement of the rod-shaped taper tool 41 is converted into the radial displacement of the ring-shaped taper tool 51, and a force 31 is applied from the inside of the annular tooth 11.

  FIG. 6 is a conceptual diagram when the annular tooth 11 is divided using the blade tool 61, and FIG. 7 shows an example of the blade tool shape. By pushing the cutting edge 62 of the blade-shaped tool 61 into the teeth dividing portion 63 radially outward in the direction perpendicular to the plate thickness direction, the blade teeth 61 are locally deformed into the dividing portion 63 of the annular teeth 11 to divide the annular teeth 11. Further, an upper layer side is formed by pressing a tool 71 having a taper 72 in the axial direction of the cylinder and having the blade edge 73 of the blade-like tool disposed in the circumferential direction in a plane passing through the axis of the cylinder into the annular tooth 11. Divide more sequentially.

  The present invention can be used in the field of manufacturing a stator of a rotating electrical machine.

The figure seen from the surface perpendicular | vertical to the axis | shaft of the stator before this process based on 1st and 2nd embodiment of this invention. The perspective view of the stator before the process which concerns on 1st and 2nd embodiment of this invention. The figure seen from the surface perpendicular | vertical to the axis | shaft of the stator after this processing based on 1st and 2nd embodiment of this invention. It is a perspective view of the stator after processing concerning the 1st and 2nd embodiments of the present invention. It is sectional drawing of the tool which loads force from the center side of annular teeth. It is a conceptual diagram of the division | segmentation of the cyclic | annular teeth by a blade-shaped tool. It is a perspective view of a blade-shaped tool. It is the figure which looked at the coil before a process from the surface perpendicular | vertical to the axis | shaft of a stator. It is the figure which looked at the coil after a process from the surface perpendicular | vertical to the axis | shaft of a stator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stator, 11 ... Ring tooth, 12a ... Teeth (before division), 12b ... Teeth (after division), 13 ... Notch, 16 ... Cut, 21 ... Yoke, 41 ... Rod taper tool, 51 ... Ring taper Tool, 61 ... Blade tool.

Claims (9)

  In a stator of a rotating electrical machine, an annular tooth is integrated in the winding process, and after the winding process, a force is applied to the outside of the annular tooth from the inside in the radial direction so that each tooth is divided into open slots. A method of manufacturing a stator of a rotating electric machine, characterized by comprising:   A method of fitting a tooth and a yoke in a stator of a rotating electric machine, wherein a cut is made in the radial direction of the stator on the radially outer side of the stator of the tooth to form a Y shape, and the stator is placed in the yoke fitting portion. A sector-shaped recess centered on the center side in the radial direction and a convex shape in the center direction of the stator at the center in the circumferential direction inside the sector-shaped recess, and the tooth cut is pressed against the convex portion of the yoke. As a result, the Y-shape of the teeth is expanded by the convex portion of the yoke, the Y-shape portion is plastically deformed, and the end surface on the outer side in the circumferential direction of the teeth Y-shape portion is in contact with the end surface on the inner side in the yoke sector shape. A method of fitting a tooth and a yoke, characterized by restraining the teeth.   A rotating electric machine stator, wherein a tooth-shaped fitting portion between teeth and a yoke has a Y-shape in the radial direction, and the yoke side has a convex shape at a fan-shaped central portion. Electric stator.   A method of manufacturing a stator of a rotating electrical machine, wherein the inner core division according to claim 1 and the teeth and yokes according to claim 2 are fitted in the same process.   In the winding step, the coil is a round wire, and in the step of the method for manufacturing a stator of a rotating electric machine according to any one of claims 1, 2, and 4, the coil is plastically deformed to change a coil cross-sectional shape. The manufacturing method of the stator of a rotary electric machine.   5. The method of manufacturing a stator for a rotating electrical machine according to claim 1, wherein a tool having a taper on the outer side of a bar and a tool having a taper corresponding to the taper on an inner side of a ring are provided. A method for manufacturing a stator of a rotating electrical machine, wherein the tool having a bar-like taper is pushed in the axial direction of the tool having a taper on the inside of the ring shape.   5. The stator of a rotating electrical machine according to claim 1, wherein a blade-like tool is pushed radially outward into the tooth dividing portion. Manufacturing method.   8. The method of manufacturing a stator for a rotating electrical machine according to claim 7, wherein a tool having a taper in the axial direction of the cylinder and having the cutting edge of the blade-like tool arranged in the circumferential direction in a plane passing through the axis of the cylinder is used. A method of manufacturing a rotating electric machine stator.   5. The method of manufacturing a stator of a rotating electrical machine according to claim 1, wherein the radial direction of the stator of the rotating electrical machine is divided into portions where the annular teeth are divided before the annular teeth are divided. A method of manufacturing a stator for a rotating electrical machine, wherein notches are formed on the outside or the inside, or both the inside and the outside.

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