WO2020066180A1 - Coil insertion device - Google Patents

Abstract

[Problem] To provide a coil insertion device with which it is possible to reduce a load applied to a coil. [Solution] The present invention comprises: a plurality of blades 110 arranged on the radially inner side of a stator core 10; and a stripper 120 arranged on the radially inner side of the plurality of blades 110, the stripper 120 moving in the axial direction of the stator core 10. The stripper 120 comprises a protruding part 120A that protrudes radially outward. A radially outer end of a protruding part 120B is positioned on the radially inner side from radially outer ends of the blades 110.

Description

Coil insertion device

The present invention relates to a coil insertion device.

There is known a method for manufacturing a stator in which a coil is inserted into a stator core. For example, Patent Document 1 discloses a coil insertion device that inserts a coil bundle into a stator core in an axial direction.

JP 2000-125521 A

In the coil insertion device, a load is applied to the coil since one end of the coil bundle is pulled over in the axial direction and is moved over the blade while being aligned along the axial direction of the blade.

The present invention has been made in view of the above problems, and provides a coil insertion device capable of reducing a load applied to a coil.

A coil insertion device according to an exemplary embodiment of the present application includes a plurality of blades disposed radially inside a stator core, and a stripper disposed radially inside the plurality of blades and moving in an axial direction of the stator core. The stripper has a projection projecting radially outward, and the radial outer end of the projection is located radially inward of the radial outer end of the blade.

According to the exemplary embodiment of the present application, the load on the coil can be reduced.

FIG. 1 is a perspective view of the stator. FIG. 2 is a side view of the coil insertion device. FIG. 3 is a plan view of the coil insertion device. FIG. 4 is a side view showing the blade and the stripper. FIG. 5 is a flowchart showing the flow of the coil insertion step. FIG. 6 is a side view showing the installation process. FIG. 7 is a side view showing the coil pulling step. FIG. 8 is a side view showing the coil holding step. FIG. 9A is a side view showing the start of the coil pushing process. FIG. 9B is a side view illustrating the middle of the coil pushing step. FIG. 9C is a side view showing the completion of the coil pushing step. FIG. 10 is a side view showing a removing step.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the technical idea of the present invention.

In the following description, the direction in which the central axis of the stator extends is referred to as “axial direction” unless otherwise specified. One side along the axial direction is defined as an upper side, and the other side is defined as a lower side. The direction orthogonal to the center axis of the stator is referred to as “radial direction”. One side along the radial direction is the inside, and the other side is the outside. Further, a direction along an arc centered on the center axis of the stator is referred to as a “circumferential direction”.

In the drawings used in the following description, characteristic portions may be enlarged for convenience in order to emphasize characteristic portions. Therefore, the dimensions and ratios of each component are not necessarily the same as actual ones. In addition, for the same purpose, parts that do not have features may be omitted in the drawings.

<1. Stator> The stator will be described with reference to FIG. FIG. 1 is a perspective view schematically showing the stator in a partial sectional view.

The stator includes a stator core 10 and a coil bundle W. The stator is a component of the motor, and generates a rotational torque by interacting with a rotor (not shown). The stator of the present embodiment is a distributed winding in which a coil is wound over several slots 11.

<1-1. Stator core> The stator core 10 is formed in a hollow cylindrical shape. Stator core 10 is formed by stacking thin silicon steel plates. A plurality of teeth 13 are radially formed on the stator core 10. Slots 11 are formed between the teeth 13. The slot 11 is formed with a slot open 12 that opens radially inward. The stator core 10 of the present embodiment is an integrated stator core 10.

<1-2. Coil> Coil bundle W is formed by winding one coil. The coil of the present embodiment is a round wire, but is not limited to this. The coil bundle W is inserted into the stator core in the direction of the arrow from the inside in the radial direction to the outside in the drawing.

<2. Coil Insertion Apparatus> The coil insertion apparatus 100 will be described with reference to FIGS. FIG. 2 schematically shows the coil insertion device 100 on which the stator core 10 is installed in a side view. FIG. 3 schematically illustrates, in plan view, the coil insertion device 100 on which the stator core 10 is installed. FIG. 4 schematically shows an enlarged view of only the blade 110 and the stripper 120 of the coil insertion device 100 on which the stator core 10 is installed, in a side view.

The coil insertion device 100 inserts the coil bundle W from each slot open 12 so as to straddle two slots 11 of the stator core 10 in a coil insertion step S100 described later. As shown in FIG. 2, the coil insertion device 100 includes a blade 110, a stripper 120 as a coil moving mechanism, a pusher 130, a shaft 140, a regulating unit 150, and an urging unit 160.

<2-1. Blade> The blade 110 guides the coil bundle W hooked on the stripper 120 to the slot 11 along the axial direction and the radial direction. As shown in FIG. 3, the blade 110 is formed in a substantially trapezoidal shape in a cross-sectional view perpendicular to the axial direction. The blade 110 is arranged radially inside the teeth 13 of the stator core 10. Here, as shown in FIG. 4, a radial length Lb of the blade 110 is defined.

More specifically, as shown in FIG. 3, when the stator core 10 is installed in the coil insertion device 100, a plurality of blades 110 are radially arranged inside the stator core 10 in the radial direction. At this time, the teeth 13 of the stator core 10 and the blade 110 face each other. Further, the circumferential width at the radial inner end of the tooth 13 and the circumferential width at the radial outer end of the blade 110 are substantially the same, and are opposed to each other with their respective center positions aligned. Here, “substantially the same” means that they are the same except for the dimensional tolerance and the tolerance at the time of attachment.

As shown in FIG. 4, the upper end in the axial direction of the blade 110 is referred to as an upper end 111. The upper end 111 includes a first corner 111A, a holding part 111H, and a second corner 111B.

The first corner 111A is a radially inner end. The first corner 111A is formed in a curved shape in a cross-sectional view parallel to the axial direction.

Here, "a cross-sectional view parallel to the axial direction" means when viewed as a cross-section along the axial direction and a cross-section along a predetermined radial direction, in other words, when viewed as a cross-section perpendicular to the circumferential direction. It is. The same applies to the following.

The second corner 111B is a radially outer end. The second corner 111B is formed in a curved shape in a cross-sectional view parallel to the axial direction.

The holding unit 111H aligns the coils in the radial direction while holding the coils. The holding portion 111H is linear in a sectional view parallel to the axial direction. Here, the radial length Lh of the holding portion 111H is defined.

When the stator core 10 is installed in the coil insertion device 100, the holding portion 111H of the upper end portion 111 is positioned above the upper end of the stator core 10 in the axial direction. When the stator core 10 is installed in the coil insertion device 100, the second corner 111 </ b> B of the upper end 111 is located above the upper end of the stator core 10 in the axial direction. When the stator core 10 is installed in the coil insertion device 100, the second corner 111B of the upper end 111 may be located at substantially the same position as the upper end of the stator core 10 in the axial direction.

<2-2. Stripper> The stripper 120 as the coil moving mechanism hooks the inside of the coil bundle W in the radial direction and pulls up to the upper end 111 of the blade 110. The coil moving mechanism moves the coil bundle in the axial direction. In the present embodiment, the stripper 120 as the coil moving mechanism will be described, but the present invention is not limited to this. As shown in FIG. 4, the stripper 120 is formed in a substantially hemispherical shape. The stripper 120 has a plurality of protrusions 120A that protrude outward in the radial direction. As shown in FIG. 3, the plurality of protrusions 120A are formed radially in the radial direction.

As shown in FIG. 4, the radial outer end of the protrusion 120 </ b> A is located radially inward of the radial outer end of the blade 110. The radial length Lb of the blade 110 is larger than the radial length L1 of the protrusion 120A. Note that the radial length Lh of the holding portion 111H of the blade 110 may be larger than the radial length L1 of the protrusion 120A.

Each projection 120A has an interposition part 120B. The interposed portion 120B is interposed between the blades 110 when the stripper 120 moves in the axial direction about the center of the plurality of blades 110. The radial length Lb of the blade 110 is larger than the radial length L2 of the interposition portion 120B. Note that the radial length Lh of the holding portion 111H of the blade 110 may be larger than the radial length L2 of the interposition portion 120B.

The radially outer end of the interposition portion 120B is positioned so as to overlap the first corner portion 111A in the radial direction. In other words, the radial outer end of the protrusion 120A is between the inner end and the outer end of the first corner 111A in the radial direction.

The interposition part 120B includes a third corner part 120C. The third corner 120C is a radially outer end. The third corner 120C is formed in a curved shape in a sectional view parallel to the axial direction.

With such a configuration, the stripper 120 moves axially inside the blade 110 with the interposition portion 120B inserted between the blades 110.

<2-3. Pusher> The pusher 130 moves in the radial direction, and pushes the coil bundle W inserted between the blades 110 outward in the radial direction, thereby inserting the coil bundle W into the slot 11. As shown in FIG. 2, the plurality of pushers 130 are radially arranged radially below the stripper 120 in the axial direction. The pusher 130 is formed in a substantially triangular shape in a sectional view along the axial direction.

The pusher 130 includes a concave portion 130A, an inner end surface 130B, and an outer end surface 130C. The recess 130 </ b> A is a cutout that opens outward in the radial direction on the upper side in the axial direction of the pusher 130. The inner end face 130 </ b> B is an inner end face of the pusher 130 in the radial direction. The outer end surface 130C is a radially outer end surface of the pusher 130.

The inner end surface 130B of the pusher 130 is inclined downward in the axial direction and outward in the radial direction. The inclination angle of the inner end surface 130B of the pusher 130 is substantially the same as the inclination angle of the enlarged diameter portion 140A of the shaft 140, which will be described in detail later. Here, “substantially the same” means that they are the same except for the dimensional tolerance and the tolerance at the time of attachment.

A magnet M is provided on the inner end surface 130B of the pusher 130. A magnet M is provided on the enlarged diameter portion 140A of the shaft 140. The magnet M provided on the inner end face 130B and the magnet M provided on the enlarged diameter portion 140A are magnetically attached, so that the pusher 130 is attached to the enlarged diameter portion 140A of the shaft 140.

With such a configuration, when the shaft 140 moves upward in the axial direction, the pusher 130 moves between the blades 110 in the radial direction. The details of the operation of the pusher 130 and the shaft 140 will be described later in the coil pushing step S140.

<2-4. Shaft> As shown in FIG. 2, the shaft 140 pushes up or down the stripper 120 in the axial direction. The shaft 140 is arranged below the stripper 120 in the axial direction. The shaft 140 has an enlarged diameter portion 140A. The enlarged diameter portion 140A expands in diameter in a downward direction in the axial direction.

The shaft 140 has fins 141. The fins 141 are provided on the shaft 140 radially below the shaft 140, more specifically, below the enlarged diameter portion 140 </ b> A of the shaft 140.

The fin 141 is formed in a substantially triangular shape in a sectional view parallel to the axial direction. The inclination angle of the enlarged diameter portion 140A and the inclination angle of the outer end surface of the fin 141 are substantially the same. Note that the outer end surface of the fin 141 is a radially outer end surface of the fin 141. The fin 141 is inserted between the blades 110 as the shaft 140 moves upward in the axial direction.

With such a configuration, when the shaft 140 moves upward in the axial direction, the pusher 130 moves between the blades 110 in the radial direction. After the enlarged diameter portion 140A of the shaft 140 passes through the pusher 130 in the axial direction, the fin 141 is inserted between the blades 110 to push the pusher 130 in the radial direction.

<2-5. Regulator> Regulator 150 stops axial movement of pusher 130 at a predetermined position. The restricting section 150 includes a support section 151 and a damper 152. The support portion 151 engages with the concave portion 130A of the pusher 130 from the outside in the radial direction. The damper 152 absorbs a shock while stopping the upward movement of the support portion 151 in the axial direction.

With such a configuration, when the shaft 140 and the pusher 130 attached to the shaft 140 move upward in the axial direction, the regulating portion 150 moves from the outside in the radial direction, and the support portion 151 is moved to the concave portion 130A. Get involved. When the support portion 151 engages with the concave portion 130A, the upward movement of the pusher 130 in the axial direction is stopped.

<2-6. The urging unit 160 urges the pusher 130 inward in the radial direction. The urging section 160 includes a support section 151 and a pneumatic cylinder 161. The pneumatic cylinder 161 pushes the support part 151 inward in the radial direction.

With such a configuration, after the pusher 130 is pushed out in the radial direction, the urging portion 160 pushes the support portion 151 inward in the radial direction, so that the pusher 130 faces inward in the radial direction. Energize.

<3. Coil Insertion Step> << Coil insertion step S100 will be described with reference to FIG. In FIG. 5, the flow of the coil insertion step S100 is represented by a flow.

In the coil insertion step S100, the coil bundle W is inserted so as to straddle the two slots 11 of the stator core 10 using the above-described coil insertion device 100. More specifically, in the coil insertion step S100, the coil bundle W between the blades 110 is pushed outward in the radial direction, and the coil bundle W is inserted so as to straddle the two slots 11 from the slot open 12 of the stator core 10.

In the following description, although the coil bundle W is inserted so as to straddle the two slots 11, only the operation of being inserted into one slot 11 will be described. FIGS. 5 to 10 illustrate an operation in which two coil bundles W are inserted into each of the four slots 11.

The coil insertion step S100 includes an installation step S110, a coil lifting step S120, a coil holding step S130, a coil pushing step S140, and a removal step S150.

<3-1. Installation Step> The installation step S110 will be described with reference to FIG. In FIG. 6, the installation step S110 is schematically illustrated in a side view.

In the installation step S110, the stator core 10 is installed in the coil insertion device 100. At this time, the blade 110 is arranged inside the stator core 10 in the radial direction. A coil bundle W is disposed below the blade 110 in the axial direction. Further, a stripper 120, a pusher 130, and a shaft 140 are disposed at the center in the radial direction of the plurality of blades 110 and below the blade 110 in the axial direction.

More specifically, in the installation step S110, the coil bundle W is disposed so as to be sandwiched between the blades 110. In the coil bundle W, a radially inner portion of the annularly formed coil bundle W, which is a portion arranged radially inside the blade, is aligned along the inner end side 110A of the blade 110. Be placed. Hereinafter, the radially inner portion of the annularly formed coil bundle W is simply defined as “the inside of the coil bundle W”.

Further, in the installation step S110, when the blade 110 is disposed on the stator core 10, the second corner 111B of the upper end 111 of the blade is positioned above the upper end of the stator core 10 in the axial direction.

<3-2. Coil Pulling Step> << Coil Pulling Step S120 will be described with reference to FIG. In FIG. 7, the coil lifting step S120 is schematically illustrated in a side view.

In the coil lifting step S120, the stripper 120 moves upward in the axial direction. At this time, the coil bundle W is pulled upward in the axial direction with the inside of the coil bundle W being hooked on the protrusion 120A of the stripper 120.

More specifically, in the coil pulling step S120, the coil bundle W is pulled upward in the axial direction while being aligned along the inner end side 110A of the blade 110.

In the coil lifting step S120, the radially outer portion of the interposed portion 120B of the stripper 120 and the pusher 130 is moved upward in the axial direction while being inserted between the blades 110.

<3-3. Coil Holding Step> << Coil holding step S130 will be described with reference to FIG. In FIG. 8, the coil holding step S130 is schematically illustrated in a side view.

In the coil holding step S130, the inside of the coil bundle W is radially aligned by the holding portion 111H of the upper end 111 of the blade 110.

More specifically, from the coil lifting step S120 to the coil holding step S130, the inside of the coil bundle W is hooked by the stripper 120 and rises on the inner end side 110A of the blade 110, and the first corner of the upper end 111 of the blade 110 It is guided along the portion 111A to the holding portion 111H.

<3-4. Coil Insertion Step> The coil pushing step S140 will be described with reference to FIGS. 9A to 9C. 9A to 9C, the coil pushing step S140 is schematically illustrated in a side view. 9A shows the start of the coil pushing step S140, FIG. 9B shows the middle of the coil pushing step S140, and FIG. 9C shows the completion of the coil pushing step S140. That is, FIGS. 9A, 9B, and 9C show the coil pushing step S140 in a stepwise order.

In the coil pushing step S140, the coil bundle W held by the blade 110 is pushed into the slot 11 by the pusher 130. At this time, as the shaft 140 moves upward in the axial direction, the pusher 130 moves between the blades 110 in the radial direction.

More specifically, as shown in FIG. 9A, first, the support portion 151 moves inward in the radial direction and engages with the concave portion 130A of the pusher 130. At this time, the shaft 140 moves upward in the axial direction, but the pusher 130 stops moving in the axial direction at a predetermined position.

As shown in FIG. 9B, the shaft 140 moves further upward in the axial direction. At this time, the pusher 130 moves radially outward by rubbing between the enlarged diameter portion 140A of the shaft 140 and the inner end surface 130B of the pusher 130. The pusher 130 moves radially outward while being inserted between the blades 110, and pushes the coil bundle W inserted between the blades 110 outward in the radial direction.

As shown in FIG. 9C, the shaft 140 moves further upward in the axial direction. At this time, the radially outer end surface of the fin 141 and the inner end surface 130B of the pusher 130 rub against each other, so that the pusher 130 further moves outward in the radial direction. The pusher 130 further moves outward in the radial direction, and pushes the coil bundle W inserted between the blades 110 outward in the radial direction.

<3-5. Removal Step> {The removal step S150 will be described with reference to FIG. In FIG. 10, the removing step S150 is schematically illustrated in a side view.

In the removing step S150, the stripper 120 and the shaft 140 move downward in the axial direction. At this time, by driving the pneumatic cylinder 161 of the urging unit 160, the support unit 151 is moved inward in the radial direction. By moving the support portion 151 inward in the radial direction, the pusher 130 that has moved outward in the radial direction moves inward in the radial direction.

The pusher 130 that has moved inward in the radial direction is attached to the shaft 140 again by magnetizing the magnet M provided on the pusher 130 and the magnet M provided on the shaft 140.

<4. Effects> The effects of the coil insertion device 100 will be described. According to the coil insertion device 100, the load on the coil can be reduced. That is, since the inner side of the coil bundle W is aligned and guided to the inner end side 110A of the blade 110, the second corner 111B, the holding portion 111H, and the first corner 111A and inserted into the slot 11, the load applied to the coil is increased. Can be reduced. According to the coil insertion device 100, the coil end can be shortened. Conventionally, in the coil insertion device, one end of the coil bundle is pulled over in the axial direction, and is aligned along the axial direction of the blade to move over the blade, so that the coil end becomes long. According to the coil insertion device 100 of the present embodiment, the inner side of the coil bundle W is aligned with the upper end 111 of the blade 110 by the stripper 120 that moves in the axial direction, that is, aligned in the radial direction, and the distance between the blades is changed in the radial direction. Since the coil bundle is inserted into the slot 11 by the moving pusher 130, there is no need to move the coil W bundle over the blade 110 by moving the stripper 120 in the axial direction. Can be.

According to the coil insertion device 100, work efficiency can be improved. Conventionally, when inserting the coil bundle W from the slot open 12 into the slot 11, it has been performed manually by an operator. According to the coil insertion device 100 of the present embodiment, the pusher 130 moves between the blades 110 in the radial direction, thereby pushing the coil bundle W between the blades 110 in the radial direction, thereby improving the work efficiency as compared with the related art. can do.

<5. Other embodiments>

In the coil insertion device 100 of the present embodiment, the holding portion 111H of the blade 110 is linear in a cross-sectional view parallel to the axial direction, but is not limited to this. For example, the holding portion 111H of the blade 110 may be formed in an arc shape rising upward in the axial direction.と す る With such a configuration, the coil bundle W is smoothly inserted into the slot 11 along the holding portion 111H.

In the coil insertion device 100 of the present embodiment, the axial direction is parallel to the vertical direction, but is not limited to this. For example, the axial direction may be parallel to the horizontal direction. Specifically, in the coil insertion device, the stripper 120 and the shaft 140 may move in the horizontal direction.

DESCRIPTION OF SYMBOLS 10 ... stator core, 11 ... slot, 12 ... slot open, 13 ... teeth, 100 ... coil insertion device, 110 ... blade, 120 ... stripper, 130 ... pusher, 140 ... shaft, 150 ... regulating part, 160 ... urging | biasing part, S100: coil insertion process, W: coil bundle

Claims (11)

1. A plurality of blades arranged radially inside the stator core, and {a stripper arranged radially inside the plurality of blades and moving in the axial direction of the stator core}. A coil insertion device, comprising: a projection protruding outside of the blade; {the radially outer end of the projection is located radially inward of the radially outer end of the blade}.
2. A plurality of blades disposed radially inside the stator core; and a stripper disposed radially inside the plurality of blades and moving in the axial direction of the stator core. The coil insertion device, further comprising: a protruding portion that protrudes into the blade, wherein the radial length of the blade is greater than the radial length of the protruding portion.
3. 3. The coil insertion device according to claim 1, wherein the protrusion is located outside the radial inner end of the blade in the radial direction, and includes an interposition portion interposed between the blades. 4. {Circle around (1)} the radial length of the blade is greater than the radial length of the interposition portion;
4. 4. The coil insertion device according to claim 1, wherein an upper end portion of the blade is a holding portion that holds a coil, and a first corner portion formed at an inner end portion in the radial direction. 5. {Coil insertion device}, wherein the first corner portion is formed in a curved shape in a cross-sectional view parallel to the axial direction.
5. 5. The coil insertion device according to claim 4, wherein the holding portion is formed linearly in a sectional view parallel to the axial direction. 6.
6. 5. The coil insertion device according to claim 4, wherein the holding portion is formed in an arc shape that rises upward in the axial direction in a cross-sectional view parallel to the axial direction. 6.
7. 7. The coil insertion device according to claim 4, wherein the upper end of the blade further includes a second corner formed at an outer end in the radial direction, and the second corner. 8. Is formed in a curved shape in a cross-sectional view parallel to the axial direction.
8. The coil insertion device according to any one of claims 4 to 7, wherein (1) the radially outer end of the interposition portion is positioned so as to overlap the first corner in the radial direction.
9. The coil insertion device according to any one of claims 3 to 8, wherein the intervening portion includes a third corner formed at an outer end portion in the radial direction, and the third corner portion includes the third corner. (1) A coil insertion device that is formed in a curved shape in a sectional view parallel to the axial direction.
10. 10. The coil insertion device according to claim 9, wherein when the stator core is installed in the coil insertion device, the second corner of the blade is located at substantially the same position as the upper end of the stator core in the axial direction. Alternatively, the third corner portion of the blade is located above the upper end of the stator core in the axial direction.
11. The coil insertion device according to claim 10, wherein, when the stator core is installed in the coil insertion device, the holding portion of the blade is located above the upper end of the stator core in the axial direction. Coil insertion device.

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