Coil insertion device, and stator manufacturing method

Abstract

To highly accurately perform positioning of a coil when inserting the coil into a slot of a stator core.SOLUTION: A coil insertion device inserts a coil 3 into a slot of a stator core 2. The coil insertion device comprises: a cam ring 11 in which a plurality of cam grooves 11c and 11d is formed and which is rotatable in a circumferential direction of the stator core 2; a plurality of cam followers 12 which slides with respect to the cam grooves 11c and 11d in response to operation of the cam ring 11 in the circumferential direction, thereby operating in a radial direction in the stator core; a plurality of guides 13 which is disposed in an outer periphery of the cam ring 11 and connected to the plurality of cam followers 12, moves in the radial direction in response to the slide of the cam followers 12 and is abutted to the coil 3; and a motor 14 which operates the cam ring 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a coil insertion device that inserts a coil into a stator core and a stator manufacturing method. [Background technology]

[0002] In manufacturing a workpiece in which multiple segment coils are inserted into a stator core, insulating paper is inserted into each slot of the stator core to ensure insulation, and then a coil is inserted into the hollow portion of the insulating paper.

[0003] In this coil insertion process, it is necessary to regulate the insertion position on the inner diameter side of the coil to prevent damage to the tip portion of the insulating paper, but there is also a demand to make the insulating paper thinner.

[0004] Patent Document 1 discloses a coil bending device. When this coil bending device is used as an inner diameter guide for a coil, the coil bending member approaches the stator core while rotating in the circumferential direction, and the device can be used as a guide for eight slots in one part. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-115139 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the insulating paper is made thinner, the strength of the insulating paper decreases. Here, when the coil bending device shown in Patent Document 1 is used as an inner diameter guide, the guarantee of the coil insertion position depends on the parts precision, and depending on the dimensions, damage due to interference may not be prevented. In addition, since the coil is guided by the outer diameter of the guide part, there is a problem that it is not possible to guide coils of multiple diameters.

[0007] The present disclosure provides a coil insertion device that performs high-precision positioning of a coil when inserting the coil into a slot of a stator core. [Means for solving the problem]

[0008] The coil insertion device according to the present disclosure is a coil insertion device for inserting coils into slots of a stator core, and includes a cam ring having a plurality of cam grooves formed therein and rotatable in a circumferential direction of the stator core, a plurality of cam followers that move radially in the stator core by each sliding against the cam grooves in response to circumferential movement of the cam ring, a plurality of guides that are arranged on the outer periphery of the cam ring and connected to the plurality of cam followers respectively, and move radially in response to the radial sliding of the cam followers to abut against the coils, and a motor that operates the cam ring. This allows one guide to correspond to one slot, and allows the coil to be guided when being inserted into the slot.

[0009] In addition, the stator manufacturing method according to the present disclosure includes a step of rotating a cam ring in a circumferential direction of the stator core by power generated by a motor, a step of causing a plurality of cam followers, each of which corresponds to a plurality of cam grooves provided in the cam ring, to slide in response to the circumferential movement of the cam ring and move in a radial direction in the stator core, and a step of causing a plurality of guides, which are disposed on the outer periphery of the cam ring and connected to each of the plurality of cam followers, to move in a radial direction and abut against a coil in response to the radial movement of the plurality of cam followers, respectively. This allows one guide to correspond to one slot, and allows the coil to be guided when being inserted into the slot. Effect of the Invention

[0010] According to the present disclosure, it is possible to provide a coil insertion device that can perform positioning of a coil with high accuracy when inserting the coil into a slot of a stator core. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram of the coil insertion device excluding the motor according to the first embodiment. [Diagram 2] FIG. 1 is a diagram of a coil insertion device connected to a motor according to a first embodiment. [Diagram 3] FIG. 2 is a top view of the cam ring according to the first embodiment. [Figure 4] FIG. 3 is an enlarged view of the guide according to the first embodiment. [Diagram 5] 5A to 5C are cross-sectional views showing the position adjustment of a guide by a spacer according to the first embodiment. [Figure 6] 10 is a diagram showing that the position of the coil can be adjusted even when the diameter of the stator core is different according to the first embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] First embodiment Hereinafter, a coil insertion device according to the present embodiment will be described with reference to the drawings. As shown in Fig. 1, the coil insertion device 1 includes a cam ring 11, a cam follower 12 that can slide in a cam groove provided in the cam ring 11, a guide 13 that can move in a radial direction in accordance with the movement of the cam follower 12, and a motor 14 (see Fig. 2) that rotates the cam ring 11.

[0013] In the following description, the coil 3 is inserted into the stator core 2 using the coil insertion device 1. The stator core 2 is cylindrical with a plurality of steel plates or the like stacked vertically, has a central axis in the vertical direction, and the horizontal direction is the radial direction. In the following description, the radial direction of the stator core 2 is the radial direction of the cam ring 11.

[0014] FIG. 1(a) is a perspective view showing an example of a coil insertion device 1 excluding a rotation mechanism such as a motor 14 for rotating a cam ring 11, and FIG. 1(b) is a side view exploded along the AA section of FIG. 3(a) described later so that the cam ring 11 and guide 13 of the coil insertion device 1 can be easily seen.

[0015] 2 is a diagram of the coil insertion device 1 showing a state in which the cam ring 11 is operated using the power of the motor 14. The cam ring 11 is disposed above the stator core 2 and radially inward of the coils 3 to be inserted, and the outer diameter of the cam ring 11 is formed to be smaller than the inner diameter of the stator core 2.

[0016] Returning to FIGS. 1(a) and 1(b), the cam ring 11 is made up of an upper cam ring 11a and a lower cam ring 11b.

[0017] 3(a) is a top view of the upper cam ring 11a. The upper cam ring 11a is configured in a disk shape having surfaces in the up and down directions. In addition, a plurality of cam grooves 11c are formed near the outer diameter of the upper cam ring 11a.

[0018] Here, 24 cam grooves 11c are formed in upper cam ring 11a. Cam grooves 11c are formed to extend inward and outward in the vicinity of the outer diameter of upper cam ring 11a, and are each formed in a similarly curved arc shape in the circumferential direction.

[0019] The multiple cam followers 12 are arranged so that each can slide in the cam groove 11c. Here, Fig. 3(b) and Fig. 3(c) are enlarged views of the upper cam ring 11a shown in Fig. 3(a). The cam followers 12 arranged in the cam grooves 11c provided in the upper cam ring 11a are referred to as upper cam followers 12a.

[0020] The upper cam followers 12a are each connected to a guide 13. Here, each guide 13 connected to the upper cam follower 12a is referred to as an upper guide 13a.

[0021] The upper guide 13a is disposed on the outer periphery of the cam ring 11. Furthermore, the upper guide 13a is disposed below the upper cam follower 12a, and the upper portion of the upper guide 13a is connected to the lower portion of the upper cam follower 12a. When the upper cam ring 11a moves in the circumferential direction and the upper cam follower 12a slides in the cam groove 11c and moves in the inward and outward direction in the radial direction, as shown in FIG. 3(b), the upper guide 13a moves in the inward and outward direction in the radial direction in response to the movement of the upper cam follower 12a, as shown in FIG. 3(c). As a result, the outer diameter portion of the upper guide 13a abuts against the inner diameter side of the coil 3, thereby guiding the insertion position of the coil 3 inserted from above into the slot portion of the stator core 2.

[0022] The lower cam ring 11b is similar to the upper cam ring 11a. That is, the lower cam ring 11b is provided with 24 cam grooves 11d, and 24 lower cam followers 12b are arranged in a state of sliding with the respective cam grooves 11d. The lower guide 13b has a lower part connected to an upper part of the lower cam followers 12b. The lower guide 13b simultaneously moves inward and outward in the radial direction in response to the lower cam followers 12b sliding inward and outward in the radial direction due to the operation of the lower cam ring 11b.

[0023] Here, the upper guide 13a and the lower guide 13b are disposed between the upper cam ring 11a and the lower cam ring 11b, and the upper guide 13a and the lower guide 13b can be set to the same height in the up-down direction. Moreover, the upper guides 13a and the lower guides 13b are disposed so as to alternate in the circumferential direction when viewed from above.

[0024] As a result, 24 cam grooves 11c are provided in the upper cam ring 11a for sliding the upper cam followers 12a, and 24 cam grooves 11d are provided in the lower cam ring 11b for sliding the lower cam followers 12b, so that a total of 48 guides, 24 upper guides 13a and 24 lower guides 13b, can be moved radially inward and outward at the same time.

[0025] This is because if all 48 guides were driven by either upper cam ring 11a or lower cam ring 11b, the diameter of the cam ring would be much larger than the inner diameter of stator core 2, resulting in interference. For this reason, the cam ring is divided into upper cam ring 11a and lower cam ring 11b, and each cam ring is configured to drive 24 guides, thereby reducing the diameter of the cam ring.

[0026] Also, the guide diameter of the guide 13 can be freely set. Here, FIG. 4(a) is a top view of a part of the upper cam ring 11a of the coil insertion device 1, and FIG. 4(b) is an enlarged view of the BB section shown in FIG. 4(a). As shown in the enlarged view of the guide 13 shown in FIG. 4(b), a spacer 21 for adjusting the radial inner and outer positions of the guide 13 can be inserted at the point where the cam follower 12 and the guide 13 are connected. More specifically, the spacer 21 is a spacer whose radial thickness can be changed, and can be changed for each of the 48 guides 13 provided. FIG. 5 is a BB section similar to FIG. 4(b), and shows a state in which the position of the guide 13a is adjusted in the radial direction by changing the thickness of the spacer 21.

[0027] This allows the position of the guide 13 to be adjusted for each slot provided in the stator core 2. Therefore, it is possible to guarantee the insertion position of the coil 3 into the slot of the stator core 2 with high precision without relying on parts standards, and it is also possible to prevent damage to the tip of the insulating paper.

[0028] Furthermore, since the diameter of the guide 13 can be freely set, it can be applied to a plurality of types of coils 3 having different diameters.

[0029] In addition, upper cam ring 11a is referred to as the first cam ring, lower cam ring 11b is referred to as the second cam ring, upper cam follower 12a is referred to as the first cam follower, lower cam follower 12b is referred to as the second cam follower, upper guide 13a is referred to as the first guide, and lower guide 13b is referred to as the second guide.

[0030] Next, the overall configuration of the coil insertion device 1 will be described with reference to Fig. 2. That is, the overall configuration of the coil insertion device 1 will be described in which the motor 14 applies power to the cam ring 11 to operate the guide 13 and guide the coil 3.

[0031] As shown in FIG. 2, the coil insertion device 1 includes, in addition to the above-mentioned cam ring 11, multiple cam followers 12, and guide 13, a first motor 14, a cam ring rotation shaft 15, a worm wheel 16, a worm gear 17, a second motor 18, a ball screw 19, and a fixing part 20 that supports the vertical position of the cam ring 11.

[0032] Here, the fixed portion 20 extends in the vertical direction and penetrates the inner diameter of the stator core 2 in the vertical direction. The cam ring 11 is rotatably placed on the upper end of the fixed portion 20. A flange portion 20a is formed at the lower end of the fixed portion 20, and a ball screw 19 connected to the second motor 18 penetrates the flange portion 20a in the vertical direction.

[0033] As a result, the ball screw 19 is driven in response to the operation of the second motor 18, and a force that moves the fixed part 20 in the vertical direction is applied to the fixed part 20. In response to the vertical movement of the fixed part 20, the vertical position of the cam ring 11 can be adjusted.

[0034] The first motor 14 is disposed below the stator core 2. The first motor 14 is connected to the cam ring rotating shaft 15 via a worm wheel 16 and a worm gear 17. The first motor 14 generates power for rotating the cam ring 11 via the cam ring rotating shaft 15.

[0035] The cam ring rotating shaft 15 is a shaft extending in the vertical direction, and is connected to the first motor 14 near its lower end via a worm wheel 16 and a worm gear 17. The cam ring rotating shaft 15 is also disposed penetrating the inner diameter of a fixing portion 20 disposed penetrating the inner diameter of the stator core 2, and is connected to the cam ring 11 at or near its upper end. Typically, the cam ring rotating shaft 15 is fastened to the cam ring 11 near its upper end by bolting.

[0036] As a result, the driving force generated by the first motor 14 is transmitted to the cam ring 11 via the cam ring rotation shaft 15. As a result, the upper cam ring 11a and the lower cam ring 11b simultaneously rotate in the circumferential direction, driving a total of 48 upper cam followers 12a and lower cam followers 12b, and moving the 48 guides 13 forward radially outward. In other words, by moving the 48 guides 13 radially outward, each guide 13 can abut against the innermost coil 3a to adjust its position.

[0037] In other words, the coil insertion device 1 can perform the following steps: a step in which the cam rings 11a, 11b rotate in the circumferential direction of the stator core by the power generated by the motor 14; a step in which the cam followers 12a, 12b slide against the multiple cam grooves 11c, 11d provided in the cam rings 11a, 11b in response to the circumferential movement of the cam rings 11a, 11b, thereby moving in the radial direction of the stator core 2; and a step in which the multiple guides 13a, 13b arranged on the outer periphery of the cam rings 11a, 11b and connected to the multiple cam followers 12a, 12b, respectively, move in the radial direction and abut against the coil 3 in response to the radial movement of the multiple cam followers 12a, 12b, respectively.

[0038] As described above, the coil insertion device 1 can adjust the positions of the coils 3 to be inserted into the slots individually for each slot. This can prevent the coils 3 from coming into contact with the insulating paper provided in the slots of the stator core 2.

[0039] Furthermore, in the coil insertion device 1, the guides 13 can be operated individually. That is, as shown in Fig. 6, the guides 13 operate radially independently, so that even if the diameters of the stator cores are different, the position of the coils arranged in each stator core can be adjusted.

[0040] In other words, in the coil insertion device 1, the guide 13 moves outward from a state in which it is disposed radially inward, thereby making it possible to abut against and adjust the position of the innermost coil of the coil a provided in a stator core that is formed to be short in the radial direction. Also, in the coil insertion device 1, the guide 13 moves further outward from a state in which it is disposed radially outward, thereby making it possible to abut against and adjust the position of the innermost coil of the coil b provided in another stator core that is formed to be long in the radial direction. In other words, the coil insertion device 1 can adjust the position of the coil to be inserted into each of a plurality of patterns of stator cores formed with different diameters.

[0041] The first motor 14 is arranged to rotate around a horizontal axis, and the direction of rotation is changed via a worm wheel 16 and a worm gear 17, so that the cam ring rotation shaft 15 rotates around a vertical axis.

[0042] This allows the cam ring rotating shaft 15 to be long from the first motor 14 to the cam ring 11, achieving a long stroke, and the self-locking of the worm gear 17 prevents the reaction force from the coil 3 from being transmitted to the motor shaft.

[0043] Furthermore, since motors 14 are generally formed long in the axial direction, by arranging the first motor 14 so that the rotation axis is horizontal, it is possible to save space in terms of the overall height of the coil insertion device 1.

[0044] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the purpose of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention. [Explanation of symbols]

[0045] 1 Coil insertion device 2 Stator core 3 Coil 11 Cam Ring 11a Upper cam ring 11b Lower cam ring 11c Cam groove 11d Cam groove 12 Cam follower 12a Upper cam follower 12b Lower cam follower 13 Guide 13a Upper guide 13b Lower guide 14 First Motor 15 Cam ring rotation axis 16 Worm Wheel 17 Worm Gear 18 Second Motor 19 Ball screw 20 Fixed part 20a Flange part 21 Spacer

Claims

1. A coil insertion device for inserting a coil into a slot of a stator core, a cam ring having a plurality of cam grooves formed therein and rotatable in a circumferential direction of the stator core; a plurality of cam followers that slide in the cam grooves in response to a circumferential movement of the cam ring, and thereby move in a radial direction of the stator core; a plurality of guides that are disposed on an outer periphery of the cam ring and are connected to the plurality of cam followers, and move in a radial direction in response to the cam followers sliding in the radial direction to come into contact with the coil; A motor for operating the cam ring. Coil insertion device.

2. The cam ring is a first cam ring having a plurality of cam grooves in which the plurality of first cam followers slide respectively; a second cam ring having a plurality of cam grooves in which the plurality of second cam followers slide, The guide is a plurality of first guides disposed between the first cam follower and the second cam follower and each moving in a radial direction in response to sliding of the first cam followers; A plurality of second guides are disposed between the first cam follower and the second cam follower and move in a radial direction in response to sliding of the plurality of second cam followers. The coil insertion device according to claim 1 .

3. The plurality of first guides and the plurality of second guides are are arranged alternately in the circumferential direction, When the first cam ring and the second cam ring are simultaneously rotated in a circumferential direction by the power of the motor, the first cam ring and the second cam ring are moved outward in a radial direction. The coil insertion device according to claim 2 .

4. a cam ring rotating shaft disposed to penetrate an inner diameter of the stator core and having one end connected to the cam ring; The motor is a worm gear and a worm wheel connected to the other end of the cam ring rotating shaft, and rotating the cam ring rotating shaft in the circumferential direction to rotate the cam ring in the circumferential direction; The coil insertion device according to claim 3 .

5. a step of rotating a cam ring in a circumferential direction of a stator core by power generated by a motor; a step of sliding a plurality of cam followers, each of which corresponds to a plurality of cam grooves provided in the cam ring, in response to a movement of the cam ring in a circumferential direction, and moving in a radial direction of the stator core; and a step of moving a plurality of guides, which are disposed on an outer periphery of the cam ring and connected to the plurality of cam followers, in a radial direction and abut against a coil in response to the radial movement of the plurality of cam followers. Stator manufacturing method.

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