JP2008283736A - Method and device for assembling stator of rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electrical machine in which not only a coil conductor can be attached easily to a slot but also circularity can be set easily and magnetic characteristics can be made uneven. <P>SOLUTION: A rectangular conductor 1L is wound planarly in continuous wave and shaped into a tubular coil 2 which is then supported on a jig 4. While winding a belt shape steel plate 8 having slots 13 spirally and continuously from the outer circumferential side of the tubular coil 2, the slot 13 is attached to the tubular coil 2, thus forming a stator core 17 having predetermined dimensions of lamination. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator assembling method and a stator assembling apparatus for a rotating electrical machine, and more particularly, to a stator assembling method and a stator assembling apparatus for a rotating electrical machine in which a stator winding is formed using a flat conductor.

  Normally, when a stator winding using a rectangular conductor is incorporated in a slot of the stator core, a coil conductor formed in a substantially U shape is inserted into each slot of the stator core formed in an annular shape. However, it takes time and labor to insert these coil conductors into the slots, and in recent years, the assembly direction of the stator as disclosed in Patent Document 1 has been proposed.

Japanese Patent Laying-Open No. 2003-32933 (FIG. 21)

  According to the method for assembling the stator described in Patent Document 1, it is easy to mount the coil conductor in the slot, and the working time can be greatly shortened.

  However, since the stator core is in the unfolded state when the coil conductor is mounted in the slot, after the coil conductor is mounted in the slot, the unfolded stator core is bent into an annular shape (cylindrical shape). Both ends of the bent stator core are butted and connected.

  As a result, a bending device that requires a strong bending force is required in the process of bending the deployed stator core in an annular shape, and the amount of deformation between the inside and the outside of the stator core differs when bending in an annular shape. For this reason, there is a new problem that the laminated steel plates are undulated and a gap is formed between the laminated steel plates, or it is difficult to achieve roundness. In addition, because of the configuration in which both ends of the annularly bent stator core are butted and joined, the magnetic properties of the joined portion differ from other portions, and the magnetic properties in the circumferential direction of the stator core become non-uniform. There is a new problem.

  An object of the present invention is to provide a stator of a rotating electrical machine that can easily be rounded and have non-uniform magnetic characteristics, as well as easy mounting of a coil conductor in a slot.

  In order to achieve the above-mentioned object, the present invention supports a cylindrical coil formed into a cylindrical shape after a flat rectangular conductor is planarly wound on a plane, and a strip-shaped steel plate having a slot formed on the outer periphery of the cylindrical coil. The slot is attached to a cylindrical coil while being continuously wound spirally from the side so as to form a stator core having a predetermined laminated dimension.

  In this way, the strip steel plate is continuously wound spirally around the cylindrical coil supported for employment, and the slot is attached to the coil so that the strip steel plate can easily follow the outer periphery of the cylindrical coil and be wound. Since it can be attached, roundness can be easily obtained. In addition, since the stator core is formed by spiral winding of a strip-shaped steel plate, there is no seam in the circumferential direction, and the magnetic characteristics in the circumferential direction of the stator core can be made uniform.

  As described above, according to the present invention, it is possible to obtain a stator of a rotating electrical machine that can easily provide roundness and have non-uniform magnetic characteristics, as well as easy mounting of a coil conductor in a slot. be able to.

  Hereinafter, an embodiment of a stator assembly method for a rotating electrical machine according to the present invention will be described with reference to FIGS.

  First, as shown in FIG. 1, a plurality of rectangular conductors 1L, which are insulated from each other, are bent continuously in a flat shape in a flat shape, and a straight portion 1A attached to a slot of a stator core, which will be described later, A planar coil 1 having a coil end portion 1B protruding outside the slot is formed. After the step thus formed, the cylindrical portion 2 shown in FIG. 2 is formed by bending into a cylindrical shape (annular shape) so that the linear portions 1A are arranged at equal intervals in the circumferential direction. A cylindrical coil (stator winding) 2 formed in such a process is mounted on a cylindrical work 4 standing upright on a turntable 3 as shown in FIGS. The turntable 3 is rotated at a constant speed by a rotation drive mechanism 5 including an electric motor and a speed reducer, and is driven in a vertical direction along the upright direction of the hire 4 by an elevating mechanism 7 having a ball screw 6. .

  On the other hand, the strip-shaped steel plate 8 is stocked as a hoop material 9, and the hoop material 9 is unloaded by the driving rollers 10A and 10B, and a press mechanism 12 having a pair of movable mold 11A and fixed mold 11B. Transport to. The strip-shaped steel plate 8 is formed by forming a slot 13 in the hoop material 9 and a wave crest 14 continuous in the longitudinal direction on the opposite side opposite to the bottom of the slot 13 by the press mechanism 12. In addition, the said wavy mountain 14 becomes a bending absorption part which absorbs the bending of the steel plate by the inner and outer diameter difference when the strip | belt-shaped steel plate 8 is wound helically.

  The strip-shaped steel plate 8 formed through such a process is guided to the outer periphery of the cylindrical coil 2 on the turntable 3, and the slot 13 is inserted into the cylindrical coil 2 via the forming rollers 15A and 15B and the pressure rollers 16A and 16B. Is attached to the straight portion 1A. By carrying out this operation while rotating the rotary table 3 and lowering it downward, the strip steel plate 8 is continuously spirally mounted on the outer periphery of the cylindrical coil 2, and the stator core 17 having a predetermined lamination dimension is formed. It is formed. By the way, the forming rollers 15A and 15B are to press from the outer peripheral side so that the slot 13 of the strip steel plate 8 is correctly wound around the coil conductor of the cylindrical coil 2, and the pressure rollers 16A and 16B are The crest 14 formed on the side opposite to the slot of the strip steel plate 8 is crushed, and the strip steel plate 8 is easily curved along the outer periphery of the cylindrical coil 2 by these forming rollers 15A and 15B and the pressure rollers 16A and 16B. As a result, the occurrence of bending due to the difference between the inner and outer diameters of the strip steel plate 8 caused by winding is prevented.

  If the stator core 17 having a predetermined lamination dimension is formed on the outer periphery of the cylindrical coil 2 through the above steps, the strip steel plate 8 is cut by the pair of cutting blades 18A and 18B, and the end of the cut strip steel plate 8 is removed. Then, after passing the forming rollers 15A and 15B and the pressure rollers 16A and 16B, they are fixed to the laminated stator core 17 by fixing means such as welding.

  Then, the stator 19 shown in FIG. 7 is obtained by removing the cylindrical coil 2 to which the stator core 17 is attached from the hiring 4. Then, the stator 19 is mounted on a stator frame (not shown) of the rotating electrical machine, and the rotor 20 is assembled on the inner diameter side of the stator 19 through a minute gap so as to be pivotally supported on the stator frame. The rotating electric machine is configured with

  As described above, according to the present embodiment, the stator winding is formed as the cylindrical coil 2 separately from the stator core 17, and the forming rollers 15 </ b> A and 15 </ b> B are formed on the cylindrical coil 2. The slot 13 is mounted while continuously winding the strip-shaped steel plate 8 in a spiral manner via the pressure rollers 16A and 16B, and at the same time, the strip 14 is wound while being crushed, so that the strip-shaped steel plate 8 is easily bent and wound. As a result, it is possible to obtain the stator core 17 having a high roundness as well as the mounting of the coil conductor in the slot. Further, since there is no connection portion in the stator core 17, the magnetic characteristics in the circumferential direction can be made uniform.

  By the way, in the above embodiment, in order to increase the roundness, the ridge 14 is formed in the strip steel plate 8, and the ridge 14 is crushed at the time of winding so that the strip steel plate 8 is easily bent. However, the anti-slot side of the strip-shaped steel plate 8 may be stretched by applying a tension just before being wound around the cylindrical coil 2 so as to be easily bent.

  Moreover, in the said embodiment, it exists in linear form until just before the strip | belt-shaped steel plate 8 is wound around the cylindrical coil 2, and if it winds, a difference will arise in an inner and outer diameter. Therefore, as shown in detail in FIG. 4, the slot 13 formed in the strip-shaped steel plate 8 is formed so that the opening width is wider than the bottom width. Such a process of forming the slot 13 is performed by the press mechanism 12 and can be easily formed.

  Thus, by forming the slot 13 so that the opening width is wider than the bottom width, when the strip-shaped steel plate 8 is wound around the cylindrical coil 2, the slot 13 can be easily attached to the coil conductor. Can be bent into a simple ring. Preferably, among the teeth 21 positioned between the adjacent slots 13, the front side 21A in the winding direction is formed into a curve in which the radius of the arc gradually increases from the tooth root side to the tooth tip side, When the slot 13 is attached to the conductor, the chance that the coil conductor rubs against the front side 21A of the tooth 21 can be reduced. By forming this curve as an involute curve, it becomes possible to avoid rubbing between the front side 21A of the tooth 21 and the coil conductor.

  Further, the tooth 21 has a protrusion 22 that narrows the opening width of the slot 13 at the tip of the tooth on the rear side 21B in the winding direction. The protrusions 22 can be formed simultaneously by the press mechanism 12. The protrusion 22 is separated from the coil conductor during the mounting of the slot 13 to the coil conductor, and engages with the top of the coil conductor in the slot 13 when the winding of the strip steel plate 8 is completed, so that the slot of the coil conductor is engaged. 13 functions as a stopper from the inside.

The top view which shows the planar coil used for this invention. The front view which shows the cylindrical coil which formed the planar coil of FIG. 1 in the cylindrical shape. The top view which shows the winding state to the cylindrical coil of the strip-shaped steel plate in which the slot was formed. The enlarged view of the strip | belt-shaped steel plate of FIG. The schematic plan view which shows the formation of a strip steel plate, and the winding equipment to the cylindrical coil of a strip steel plate. The side view of FIG. The schematic front view which shows the relationship between a stator and a rotor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Planar coil, 1A ... Linear part, 1B ... Coil end part, 1L ... Flat conductor, 2 ... Cylindrical coil, 3 ... Turntable, 4 ... Employment, 5 ... Rotation drive mechanism, 6 ... Ball screw, 7 ... Elevating mechanism, 8 ... strip steel plate, 9 ... hoop material, 10A, 10B ... driving roller, 11A ... movable die, 11B ... fixed die, 12 ... press mechanism, 13 ... slot, 14 ... wave mountain, 15A, 15B ... molding Roller, 16A, 16B ... pressure roller, 17 ... stator core, 18A, 18B ... cutting blade, 19 ... stator, 20 ... rotor, 21 ... teeth, 21A ... front side, 21B ... rear side, 22 ... projection.

Claims (11)

  A flat coil is continuously wound on a flat surface to be supported on the job by a cylindrical coil, and a slot-shaped steel plate is spirally wound from the outer periphery while the slot is mounted on the cylindrical coil. A stator assembling method for a rotating electric machine, characterized by forming a stator core having a laminated dimension.   A step of forming a cylindrical coil after flat-wave winding a flat conductor in a flat plane, a step of forming a slot in the strip steel plate, and a spirally winding the strip-shaped steel plate having the slot formed from the outer peripheral side of the cylindrical coil And mounting the slot to a rectangular conductor in the straight portion of the cylindrical coil to form a stator core having a predetermined laminated dimension.   A step of forming a cylindrical coil after planar wave winding of a flat conductor, a step of forming a slot in the strip steel plate, and a spirally winding the strip-shaped steel plate having the slot formed from the outer peripheral side of the cylindrical coil And a step of attaching the slot to the rectangular conductor in the straight portion of the cylindrical coil to form a stator core having a predetermined laminated dimension while removing the bending due to the inner and outer diameter differences of the strip-shaped steel plate caused by winding. Electric stator assembly method.   The process of forming a cylindrical coil after flat-wave winding of a rectangular conductor in a flat plane, the step of forming a slot in a strip steel plate, and absorbing the bending of the steel plate due to the difference in inner and outer diameters when the strip steel plate is spirally wound A step of forming a bending absorbing portion, and a slotted steel plate is spirally wound from the outer peripheral side of the cylindrical coil while the slot is attached to a rectangular conductor in the linear portion of the cylindrical coil to form a predetermined laminate. Forming a stator core with dimensions.   The process of forming a cylindrical coil after flat-wave winding of a rectangular conductor in a flat plane, the step of forming a slot in a strip steel plate, and absorbing the bending of the steel plate due to the difference in inner and outer diameters when the strip steel plate is spirally wound Forming the bending absorbing portion on the opposite slot side of the strip-shaped steel plate, and winding the slot-shaped steel plate forming the slot and the bending absorbing portion spirally from the outer peripheral side of the cylindrical coil. A stator assembly method for a rotating electrical machine, comprising: a step of attaching a rectangular conductor in a section to form a stator core having a predetermined laminated dimension.   6. The method for assembling a stator for a rotating electrical machine according to claim 5, wherein the step of forming the bending absorbing portion is a step of forming a wave ridge continuous in the circumferential direction on the opposite slot side of the strip steel plate.   7. The method of assembling a stator for a rotating electrical machine according to claim 2, wherein the step of forming the slot is a step of forming an opening width of the slot wider than a bottom width.   The step of forming the slot is a step of forming the radius of the arc gradually from the tooth root side to the tooth tip side of the teeth of adjacent slots, the front side in the winding progress direction. The method for assembling a stator of a rotating electric machine according to claim 2, 3, 4, 5, or 6.   3. The step of forming the slot is a step of forming an involute curve from a tooth root side to a tooth tip side of a tooth in an adjacent slot, the front side in the winding advance direction. A method for assembling a stator of a rotating electric machine according to claim 3, 3, 4, 5 or 6.   The step of forming the slot is a step of forming an opening width of the slot wider than the width of the bottom portion, and forming a projection for preventing the flat conductor from coming off at the tip of the tooth on the rear side in the winding direction. The method for assembling a stator of a rotating electric machine according to claim 2, 3, 4, 5, or 6.   A mechanism for supporting a cylindrical coil formed by winding a flat rectangular conductor into a cylindrical shape, rotating it in the circumferential direction of the cylinder, and displacing it in the longitudinal direction of the cylinder; and a mechanism for forming a slot in the strip steel plate; And a mechanism for attaching a slot to a rectangular conductor in a straight line portion of the cylindrical coil by pressing a strip-shaped steel plate having a slot from the outer peripheral side of the cylindrical coil.

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