JPS6356907A - Metho and apparatus for winding coil - Google Patents

Abstract

PURPOSE:To prevent the formation of corrugated clearances among coil inner- circumferential side winding layers, and to improve insulating properties by winding a conductor under the state in which the diameter of a spool is reduced on winding- start, expanding the diameter of the spool so as to be made the same as the inner diameter of a finally required coil and winding the coil. CONSTITUTION:The diameter of a spool 18 is reduced previously, estimating the quantity of floating from the outer circumference of the spool 18 of a conductor 21 at the time of winding-start. The tip of the conductor 21 is connected into a connecting groove 22 in the spool 18, and the spool 18 is turned through a drive shaft 13 by a motor 12, applying tension T to the conductor 21, thus lap-winding the conductor 21. When the number of turns of the conductor 21 reaches a fixed number during winding, the diameter of the spool 18 is increased. The positions of both frame bodies 19 are detected by a position transducer 36 at that time, and the motor 12 is stopped when the diameter of the spool 18 is expanded up to the same size W1 as the finally required inner diameter of a coil 40. Accordingly, clearances S among the inner circumference of the coil 40 and the rectilinear sections of the outer circumferences of each frame body 19 are removed, thus fast sticking the coil 40 and the frame bodies. The spool 18 is rotated again, and the conductor 21 is wound up to the aimed number of winding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to a coil winding method and apparatus for forming a coil by winding conductive wire in multiple layers around a winding frame.

(Prior Art) A conventional coil winding device has a configuration in which an oval winding frame 1 is rotated by a drive shaft 2, as shown in FIG. When winding the coil 3, after locking the tip of the conducting wire 4 in the locking groove 5 of the winding frame 1, the winding frame 1 is rotated without applying tension T to the conducting wire 4. The conductive wire 4 is wound in multiple layers.

However, since the conductor 4 has a certain degree of rigidity,
Applying tension T to the conducting wire 4 during winding does not allow the conducting wire 4 to be wound tightly around the entire circumference of the winding frame 1, and as shown in FIG. The winding continues with a gap S partially formed between the winding and the circumference. This gap S tends to increase as the rigidity of the conducting wire 4 increases, as the tension T decreases, and as the radius of curvature Ro of a portion of the corner of the winding frame 1 decreases. When the conducting wire 4 is further wound with the gap S formed in this way, the tension T of the conducting wire 4 wound later causes so-called winding tightening, as shown in FIG. The conductive wire is deformed into a wavy shape, and many small gaps S1 are generated between the winding layers. Such a large number of small gaps S1 cause the generation of voids during resin impregnation treatment in a post-process, resulting in a reduction in insulation life due to void discharge. Also, the 8th
As shown in the figure, when the coil 3 after winding is sandwiched between the central forming die 6 and the outer forming die 7.7 and pressure-molded, each top of the corrugated portion of the inner circumference of the coil 3 and the central forming die are pressed. Since the pressing force of the outer mold 7 is applied as a concentrated load between the outer mold 7 and the outer mold 7, the insulating wave membrane in that part will be damaged.

(Problems to be Solved by the Invention) As described above, conventionally, due to tight winding, the inner circumferential side of the coil becomes corrugated and many small gaps are formed between the wound layers. This has the problem of poor insulation properties, such as causing voids to occur during pressure molding and damaging the insulating wave film of the coil during pressure molding.

The present invention aims to solve these problems,
Therefore, the object is to provide a coil winding method and device that can prevent the formation of wavy gaps between the winding layers on the inner circumferential side of the coil due to tight winding and improve insulation properties. .

[Configuration of the Invention (Means for Solving the Problems)] The coil winding method of the present invention is configured such that the diameter of the winding frame can be expanded and contracted, and at the beginning of winding, the conductor is wound with the diameter of the winding frame reduced. After winding, the diameter of the winding frame is expanded to be the same as the inner diameter of the coil that is finally required, and in this state, the conducting wire is wound to the end.

In addition, the coil winding device of the present invention includes a winding frame composed of a divided frame body, and a frame movement that expands and contracts the diameter of the winding frame by expanding and contracting the interval between each frame body of this winding frame. It is composed of a mechanism and a position detector that detects the position of the frame of the reel.

(Function) At the beginning of winding, the conductor wire is wound with the diameter of the winding frame reduced in anticipation of the looseness of the conductor from the winding frame. Then, after a predetermined amount of winding has been completed, the diameter of the winding frame is expanded to be the same as the inner diameter of the coil finally required, so that the inner circumferential side of the coil is evenly spread over the entire circumference of the winding frame.

The conductor is then wound to the end to form a coil.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 5. First, in FIG. 1 showing the overall configuration, reference numeral 11 denotes a base of the coil winding device, and a motor 12 is disposed at the bottom of the base. 13 is a base 11-I: and a pair of bearings 14
, 14, and a belt 17 is passed between a driven pulley 15 fitted on the right end of the hollow drive shaft in the figure and a drive pulley 16 fitted on the rotating shaft of the motor 12. ing. A large-diameter cylindrical portion 13a is formed at the left end of the drive shaft 13 in the drawing. Reference numeral 18 denotes an oval winding frame, which consists of two frame bodies 19 divided from the center as shown in FIGS. 2 and 3, and slide pro...I fixed to each frame body 19. 20 is slidably supported by the large diameter cylindrical portion i3a of the drive shaft 13. In this case, the sliding directions of each frame 19 are opposite to each other and perpendicular to the drive shaft 13. A locking groove 22 for locking an end of a rectangular conductor 21, for example, is formed in one frame 19. - On the other hand, in FIG. 1, reference numeral 23 denotes a pair of L-shaped levers rotatably supported via a shaft 24 within the large-diameter cylindrical portion 13a of the drive shaft 13, with one end of each L-shaped lever 23 It is engaged with an engagement groove 25 formed in the slide block 20. 2
Reference numeral 6 denotes a shaft inserted into the drive shaft 13, and the large-diameter portion 27 provided at the left end in the figure is inserted and supported so as to be slidable with the large-diameter cylindrical portion 13a of the drive shaft 13 projected. The other end of the aforementioned L-shaped lever 23 is engaged with an engagement groove 28 formed in the large diameter portion 27 . On the other hand, mandrel 2
A bearing 29 that supports the right end of 6 in the figure is fixed to a slide block 30, and this slide block 30 is attached to the base 1.
It is possible to slide along the slide guide 31 on the top 1 in the left-right direction in the drawing (in the axial direction of the mandrel 26). 32 is a motor located on the right side of the slide block 30 in the figure and fixed to the base 11, and a male screw member 33 provided on the same rotating shaft.
is screwed into a female threaded portion 34 formed on the slide block 30, and rotation of the male threaded member 33 causes the slide block 30 to move in the left-right direction in the drawing. A frame moving mechanism 35 is constituted by the motor 32, the male screw member 33, the slide block 30, the shaft 26, the L-shaped lever 23, and the like. Reference numeral 36 denotes a position detector provided on the motor 32, which detects the rotation of the motor 32 to detect the position of the frame 19.

37 is a rotation detector for detecting the rotation of the drive shaft 13, and a dog 38 provided on the outer periphery of the drive shaft 13 corresponds to this.
Each time the drive shaft 13 passes, the rotation detector 37 outputs a rotation detection signal to the counter 39 to count the number of rotations of the drive shaft 13.

Next, the operation of the configuration described in section 2 will be explained. Before winding, the winding frame 1 of the conducting wire 21 at the beginning of winding is prepared in advance.
8, the diameter of the winding frame 18 is reduced in consideration of the floating amount (overhang amount) from the outer periphery. To reduce the diameter, the motor 32 of the frame moving mechanism 35 rotates the male screw member 33 in a predetermined direction, thereby moving the slide block 30 and thus the mandrel 26 to the right in FIG. As a result, the two-sided levers 23 are rotated about the shafts 24 in the directions of the arrows in FIG. 1, and the two frames 19 are slid in a direction that narrows the distance between them. At this time, by detecting the rotational position of the motor 32 with the position detector 36, both frames 1
9 is detected, and the motor 12 is stopped when the diameter of the winding frame 18 is reduced to a predetermined dimension Wo (see FIG. 2). After that, the tip of the conducting wire 21 is locked in the locking groove 22 of the winding frame 18, and the frame 18 is rotated by the motor 12 via the drive shaft 13 without applying tension T to the conducting wire 21. , the conducting wire 21 is wound in layers. Even in this case, due to the rigidity of the conductor 21 during the first few turns of the winding, the wire 21 floats above the straight part of the outer periphery of each frame 19 as shown in FIG. It is formed. Therefore, in this method, the number of rotations of the winding frame 18 from the beginning of winding is counted by the rotation detector 37 and the counter 39, and when the number of turns of the conducting wire 21 reaches a predetermined number during winding, the motor 12 is turned off. Stop once, then reel frame 18
Enlarge the diameter of. To enlarge the diameter, use the frame moving mechanism 35
The shaft 26 is rotated by rotating the motor 32 in the opposite direction to that described above.
1 to the left in FIG. 1, the double-sided levers 23 are respectively rotated in the direction opposite to the direction of the arrow in FIG. 1, and both frames 19 are slid in a direction to widen the distance between them. At this time, as described above, the rotational position of the motor 32 and the positions of both frames 19 are detected by the position detector 36, and the diameter of the winding frame 18 is set to the same dimension W1 (third (see figure), motor 12 stops. When the diameter of the winding frame 18 is expanded in this way, the coil 40 that has been wound up to that point is pushed and expanded in the left-right direction in FIG. 2 by both frames 19,
Along with this, the coil 40 is deformed so that its vertical dimension in FIG. 2 is narrowed. As a result, as shown in FIG. 3, the gap S between the inner periphery of the coil 40 and the linear portion of the outer periphery of each frame 19 is eliminated, and the inner periphery of the coil 40 is evenly and densely distributed over the entire outer periphery of each frame 19. 'i will do it. Thereafter, the winding frame 18 is rotated again to wind the conducting wire 21 until the desired number of windings is reached.

At this time, since the already wound conductive wire 2 is in close contact with the outer periphery of the winding t'i'1g without any gaps, the winding tightening does not occur due to the conductive wire 21 that is subsequently wound. The occurrence of gaps due to tight winding is prevented. Moreover, the conducting wire 21 at a portion of each corner of the winding frame 18
The bending radius of the conductor 21 is expanded from Ro at the beginning of winding by the thickness of the winding layer of the conductor 21 to become R1.
Since the degree of bending of the conductive wire 21 is gentle, the conductive wire 21 that is subsequently wound comes to evenly adhere to the outer periphery of the already wound conductive wire 21, and no gap is generated between the winding layers. In addition, the bending radius R1 at which no gap occurs between the winding layers
Since it changes depending on the size, rigidity, tensile force applied to the conductor 21, etc. of the conductor 21, it is determined in advance through experiments, etc., and after winding the conductor until the bending radius R1 is reached,
The process moves on to the step of enlarging the winding frame 18 described above.

Since no gaps are formed between the winding layers of the coil 40 formed as described above, as shown in FIGS. 4 and 5, voids are formed between the winding layers during the resin impregnation treatment in the subsequent process. is less likely to occur, and insulation deterioration due to void discharge is suppressed. Moreover, since the inner periphery of the coil 40 is not bent into a waveform as in the conventional case, the coil 40
The load applied to the inner periphery of the coil 40 during the pressure forming process of 0 is evenly distributed throughout the coil 40 without being concentrated locally, and damage to the insulating wave film 21a (see FIG. 5) due to the load is prevented. Coupled with the above-mentioned circumstances, the insulation properties are definitely improved.

In the above embodiment, the motor 32 is used as a drive source for the frame moving mechanism 35, but a hydraulic cylinder, a pneumatic cylinder, etc. may be used instead. Further, in the above embodiment, the winding frame 18 is of a two-part type (two frames 19), but for example, it can be of a three-part type (a rectangular frame with a semicircular frame on each side). It may be a thing). Furthermore, the shape of the winding frame 18 is not limited to an ellipse, and may be, for example, an isosceles trapezoid (so-called sea cucumber shape).

Furthermore, in the above embodiment, the conducting wire 21 is wound in one row.
It may be wound in two or more rows. Further, in the embodiment described in "-", the position of the frame 19 is indirectly detected by detecting the rotational position of the motor 32 of the frame moving mechanism 35 by the position detector 36, but instead of this, the position of the frame 19 is indirectly detected. For example, a configuration may be adopted in which a detector that directly detects the position of the frame body 19 is provided as a position detector.

[Effects of the Invention] As is clear from the above description, the present invention enables the inner periphery of the coil to be densely layered over the entire outer periphery of the winding frame without gaps by enlarging the diameter of the winding frame during winding. This prevents the formation of wave-shaped gaps between the winding layers on the inner circumferential side of the coil due to tight winding, and prevents voids during resin impregnation and damage to the insulating wave film during pressure molding. This has the excellent effect of suppressing the amount of heat and improving insulation properties.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Fig. 1 is a longitudinal sectional side view of the whole, Figs. 2 and 3 are front views of the winding frame shown in different states to explain the operation, Fig. 4 is a front view of the coil, and Fig. 5 is the same. A cross-sectional view,
Figures 6 to 8 show conventional examples; Figure 6 is a view equivalent to Figure 2, Figure 7 is a view equivalent to Figure 3, and Figure 8 is a front view of the coil during pressure forming processing. It is. In the drawing, 18 is a winding frame, 19 is a frame, 21 is a conductor, 32 is a motor, 35 is a frame moving mechanism, 36 is a position detector, 40
is a coil.

Claims (1)

[Claims] 1. A method of forming a coil by winding conductive wire in multiple layers around a winding frame, the diameter of the winding frame being expandable and contractible, and the diameter of the winding frame being adjusted at the beginning of winding. The conductive wire is wound in a reduced state, and then the diameter of the winding frame is expanded to be the same as the inner diameter of the final required coil, and the conductive wire is wound to the end in this state. Characteristic coil winding method. 2. A winding frame consisting of a plurality of divided frame bodies, around which conductive wires are wound in multiple layers, and a frame whose diameter can be increased or decreased by expanding or contracting the interval between each frame body of this winding frame. a body movement mechanism;
A coil winding device comprising: a position detector for detecting the position of the frame of the winding frame.