Coil twist forming device

Abstract

To provide a coil twist forming device capable of improving the coil twist forming accuracy.SOLUTION: A coil twist forming device includes a gripping forming portion that grips the tips of the coils arranged circumferentially around a stator core and is movable in the axial and radial directions of the stator core, and a jig cuff that is inserted between the coils on the upper surface of the stator core and is movable in the circumferential direction of the stator core when the gripping forming portion is driven.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a coil twist forming apparatus. [Background technology]

[0002] Patent Document 1 discloses an apparatus for forming a coil by radially driving claws that grip the tip of the coil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-065464 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the technique disclosed in Patent Document 1, for example, when a jig cuff is used as a guide member during coil forming, there is room for improvement in terms of improving forming accuracy.

[0005] The present disclosure has been made in consideration of the above, and has an object to provide a coil twisting device capable of improving the accuracy of twisting a coil. [Means for solving the problem]

[0006] The coil twisting and shaping device of the present disclosure comprises a gripping and shaping part that grips the tip of a coil arranged circumferentially around a stator core and is capable of being driven in the axial and radial directions of the stator core, and a jig cuff that is inserted between the coils on the upper surface of the stator core and is capable of being driven in the circumferential direction of the stator core when the gripping and shaping part is driven. Effect of the Invention

[0007] According to the present disclosure, by providing a gripping forming portion that can be driven in the axial and radial directions and a jig cuff that can be driven in the circumferential direction, the twist forming accuracy can be improved. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a coil twist forming device according to an embodiment. [Diagram 2] FIG. 2 is a diagram for explaining a first step of a coil twisting method using a coil twisting device according to the embodiment. [Diagram 3] FIG. 3 is a diagram for explaining a second step of the coil twisting method using the coil twisting device according to the embodiment. [Figure 4] FIG. 4 is a diagram for explaining a third step of the coil twisting method using the coil twisting device according to the embodiment. [Diagram 5] FIG. 5 is a diagram for explaining a method for forming a power line using a coil twisting device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A coil twist forming device according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

[0010] (Twist forming device) A coil twisting device according to an embodiment will be described with reference to Fig. 1 and Fig. 2. The twisting device 1 is for twisting a coil (stator coil) 3 arranged in the circumferential direction of a stator core 2. The twisting device 1 includes a plurality of gripping and forming parts 11 and a plurality of jig cuffs 12. In this embodiment, the direction parallel to the central axis of the stator core 2 is referred to as the "axial direction", the radial direction of the stator core 2 is referred to as the "radial direction", and the circumferential direction of the stator core 2 is referred to as the "circumferential direction".

[0011] The gripping molding portion 11 is composed of a rod-shaped member extending in the axial direction. The gripping molding portion 11 is provided in the same number as the number of coils 3. For example, if the stator core 2 has 48 coils 3, 48 gripping molding portions 11 are provided accordingly. These gripping molding portions 11 are arranged in the circumferential direction, so that the overall shape is cylindrical, as shown in FIG. 1. The tip (the tip on the lower side in the axial direction) of the gripping molding portion 11 is provided with a gripping portion 111 having a concave cross section for gripping the tip of the coil 3, as shown in FIG. 2. The gripping portion 111 may have a shape other than a concave cross section as long as it can grip the tip of the coil 3.

[0012] As described later, the gripping shaping part 11 grips the tip of the coil 3 arranged in the circumferential direction of the stator core 2 when twisting the coil 3 (see Figs. 2 to 4 described later). The gripping shaping part 11 is configured to be drivable in the axial and radial directions of the stator core 2. That is, the motion axes of the gripping shaping part 11 are the axial and radial directions of the stator core 2. Note that a specific method for driving the gripping shaping part 11 in the axial and radial directions is not particularly limited.

[0013] For example, the grip molding parts 11 may be driven in the axial direction (axially downward) by pressing the upper ends of the grip molding parts 11 arranged in the circumferential direction with a cylindrical member or the like as shown in Fig. 1. Alternatively, the grip molding parts 11 may be driven in the radial direction (radially outward) by forming the inner surface (inner peripheral surface) of the grip molding parts 11 in a tapered shape and inserting a cylindrical member or the like into the cylinder of each grip molding part 11 arranged in the circumferential direction as shown in the figure and pressing it.

[0014] The jig cuffs 12 are composed of rod-shaped members extending in the radial direction. The jig cuffs 12 are provided in the same number as the number of coils 3. For example, if the stator core 2 has 48 coils 3, 48 jig cuffs 12 are provided accordingly. These jig cuffs 12 are arranged in the circumferential direction (radially), so that they form a disk shape as a whole, as shown in FIG. 1. The tip (the radially inner tip) of the jig cuffs 12 is formed, for example, in a bifurcated shape so that it can be inserted between the coils 3.

[0015] As described below, the jig cuffs 12 are inserted between the coils 3 arranged in the circumferential direction of the stator core 2 when twisting the coils 3. The jig cuffs 12 are configured to be drivable in the circumferential direction of the stator core 2. In other words, the axis of motion of the jig cuffs 12 is the circumferential direction of the stator core 2. There are no particular limitations on the specific method of driving the jig cuffs 12 in the circumferential direction.

[0016] For example, the tip (the radially outer tip) of each jig cuff 12 arranged circumferentially as shown in Figure 1 may be fixed by a cylindrical member or the like, and the jig cuff 12 may be driven circumferentially by rotating the cylindrical member circumferentially.

[0017] Here, in the past, for example, a jig cuff was inserted between each coil to fix each coil, and then the tip of each coil was gripped by a ring-shaped member called a crown, and the crown was driven in the circumferential direction to twist the coil. The crown used in this method is a ring-shaped integral member. Therefore, the conventional method had the following problems.

[0018] (1) Only coils of the same diameter can be twisted with one crown. In other words, because the annular crown is fitted onto the coil and twisted, if a coil of a different diameter is to be twisted, it is necessary to replace it with a different crown. (2) It is necessary to change the stage between thick and thin wires. In other words, since the overall diameter of a coil of thick wire and a coil of thin wire is different, it is necessary to use a crown of a different thickness depending on the type of coil. (3) Radial expansion was necessary before twisting the coils. In other words, since the crown can only be driven in the circumferential direction, each coil had to be radially expanded in advance in a previous process so that the radial position after twisting would be the same.

[0019] Therefore, in the coil twisting forming device of the embodiment, the above problems (1) to (3) are solved by providing a gripping forming section 11 that can be driven in the axial and radial directions of the stator core 2, and a jig cuff 12 that can be driven in the circumferential direction of the stator core 2.

[0020] That is, in the twist forming device 1, the gripping and shaping unit 11 can be driven in the radial direction, so that it is possible to twist coils 3 of different diameters by a set of gripping and shaping units 11 as shown in FIG. 1. Also, in the twist forming device 1, the gripping and shaping unit 11 can be driven in the radial direction, so that it is possible to twist coils 3 of different types (thick wire, thin wire) by a set of gripping and shaping units 11. Also, in the twist forming device 1, the gripping and shaping unit 11 can be driven in the radial direction, so that it is not necessary to expand each coil 3 in the radial direction in advance in a previous process. In this way, in the coil twist forming device according to the embodiment, it is possible to twist coils 3 of different diameters / lamination thicknesses without performing expansion forming in a previous process.

[0021] In this way, in the coil twisting and forming device of the embodiment, by being equipped with a gripping and forming section 11 that can be driven in the axial and radial directions, and a jig cuff 12 that can be driven in the circumferential direction, the twisting and forming accuracy of the coil 3 can be improved.

[0022] (Twist forming method) A coil twist forming method using a coil twist forming apparatus according to an embodiment will be described with reference to Fig. 2 to Fig. 4. The figures are schematic diagrams showing a cross section of the twist forming apparatus 1 cut along the central axis of a stator core 2. The coil twist forming method according to the embodiment includes a first step, a second step, and a third step.

[0023] In the first step, as shown in Fig. 2, the gripping forming part 11 is attached to the tip of the coil 3 to be formed, and the jig cuffs 12 are inserted between the coils 3 all around. Then, in the second step, as shown in Fig. 3, the gripping forming part 11 is moved along a path that does not change the wire length of the coil 3, while synchronizing the radial movement with the axial movement. At this time, the jig cuffs 12 is kept stationary without rotating in the circumferential direction.

[0024] Next, in the third step, the gripping forming part 11 is moved axially downward while rotating the jig cuff 12 in the circumferential direction. This allows the circumferential movement and the axial movement to be synchronized to form a twisting trajectory, thereby allowing the coil 3 to be twisted.

[0025] In this way, in the coil twisting method of the embodiment, the twisting accuracy of the coil 3 can be improved by using a gripping forming part 11 that can be driven in the axial and radial directions and a jig cuff 12 that can be driven in the circumferential direction.

[0026] (Power line molding method) A method for forming a power line using a coil twisting device according to the embodiment will be described with reference to FIG.

[0027] In the method for forming the power line, first, the jig cuff 12 is brought into contact with the side surface of the coil 3 to create a starting point for bending the coil 3. Next, the gripping forming part 11 is attached to the tip of the coil 3 to be formed, and the gripping forming part 11 is moved axially downward without rotating the jig cuff 12 in the circumferential direction to form the power line.

[0028] Conventionally, the power line has been formed using a jig separate from the crown and the jig cuff. On the other hand, in the power line forming method according to the embodiment, as shown in Fig. 5, it is also possible to form the power line using the same twist forming device 1. This makes it possible to suppress the increase in cost when forming the power line.

[0029] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0030] 1 Twisting device 11 Grip molding part (folding claw) 111 Gripping part 12 Jig Cuff 2 Stator core 3 Coil (stator coil)

Claims

[Claim 1] a gripping and forming part that grips the tips of the coils arranged in the circumferential direction of the stator core and is capable of being driven in the axial and radial directions of the stator core; a jig cuff that is inserted between the coils on the upper surface of the stator core and that can be driven in a circumferential direction of the stator core when the gripping forming portion is driven; A coil twisting device comprising:

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