KR102678920B1 - Apparatus for widening spaces of stator coil and control method thereof - Google Patents

Abstract

Embodiments of the present invention relate to a stator coil expansion device and a control method for adjusting the gap between the ends of a plurality of hairpins constituting a hairpin type stator coil. According to one embodiment of the present invention, a stator coil expansion device for adjusting the spacing of a plurality of hairpin protrusions inserted into a slot of a stator core and protruding from one end of the slot, comprising: a main body frame forming an appearance; a stator jig unit provided at a lower portion of the main body frame and on which the stator core is seated so that the plurality of hairpin protrusions are exposed upwardly; and a spacer unit movably provided on an upper part of the main body frame to adjust the gap between the plurality of hairpin protrusions arranged in the radial direction of the stator core. A stator coil expander and a control method are provided, including a do.

Description

Stator coil expansion device and its control method {APPARATUS FOR WIDENING SPACES OF STATOR COIL AND CONTROL METHOD THEREOF}

Embodiments of the present invention relate to a stator coil expansion device and a control method for adjusting the gap between the ends of a plurality of hairpins constituting a hairpin type stator coil.

In general, electric vehicles, called eco-friendly vehicles, can generate driving force through an electric motor that obtains rotational force from electrical energy.

Electric vehicles drive in EV (Electric Vehicle) mode, a pure electric vehicle mode that uses only the power of the electric motor, or in HEV (Hybrid Electric Vehicle) mode, which uses both the engine and drive motor as power.

Most electric motors used as a power source for electric vehicles use permanent magnet synchronous motors (PMSM).

An electric motor, a permanent magnet synchronous motor used as a power source for such an electric vehicle, basically consists of a stator that generates magnetic flux, and a rotor that rotates and is disposed with a certain gap between the stator and the permanent magnet. .

Meanwhile, it is known that the output of an electric motor is proportional to the number of turns of the coil wound on the stator core. However, if the number of turns of the coil is increased, the size of the stator core or the electric motor itself including it inevitably increases, making miniaturization difficult.

Therefore, in order to improve output without increasing the size of the electric motor, the space factor of the coil wound on the stator core is increased. In other words, the dead space between the stator core and the winding coil or the dead space between each coil can be minimized to increase the coil space ratio.

Accordingly, recently, instead of using annular coils with a circular cross-section as coil windings, square coils such as square cross-sections (referred to as "segment coils" in the industry) have been used to reduce dead space and improve the space factor, thereby reducing the output compared to the same size. There is a trend to produce high electric motors.

In order to facilitate coil winding of the square coil, a plurality of separate hairpin-shaped (approximately U- or V-shaped) stator coils are inserted into the slots of the stator core, and stator coils are radially adjacent within the slots. A method has been proposed to allow all individual stator coils to conduct electricity by welding the ends of the stator coils.

In order to improve workability and accuracy in the stator coil forming process, such as welding the ends of the stator coils, it is required to uniformly align the stator coils, or hairpin protrusions, that are inserted into the slots of the stator core and protrude to the outside.

In particular, the stator coil has a plurality of hairpin protrusions arranged on the same line along the circumferential direction of the stator core to form one coil layer, and the coil layer is formed in plurality along the radial direction of the stator core. If the spacing between coil layers is narrow or uneven and an appropriate spacing is not secured, there is a problem in that insulation between coil layers is not achieved, causing product defects and lowering productivity. Therefore, in the past, insulating paper was reinforced between coil layers to insulate the coil layers, but this resulted in excessive work time, lowering productivity, and increased production costs due to increased material costs due to additional insulating paper. .

The matters described in this background art section are written to enhance understanding of the background of the invention, and may include matters that are not prior art already known to those skilled in the art in the field to which this technology belongs.

Republic of Korea Patent Publication No. 10-0493609 (May 26, 2005)

The embodiment of the present invention adjusts the spacing between the plurality of hairpin protrusions along the radial direction of the stator core to secure the spacing for insulation between the layers of the stator coil, that is, the insulation distance, thereby preventing product defects due to non-insulation. The purpose is to provide a stator coil expansion device and a control method that can improve productivity.

In addition, an embodiment of the present invention excludes the use of additional insulating paper for insulation between the layers of the stator coil, thereby saving time required for additional insulating paper work and reducing the cost of additional insulating paper. A stator coil expansion device and This is to provide a control method.

According to one embodiment of the present invention, a stator coil expansion device for adjusting the spacing of a plurality of hairpin protrusions inserted into a slot of a stator core and protruding from one end of the slot, comprising: a main body frame forming an appearance; a stator jig unit provided at a lower portion of the main body frame and on which the stator core is seated so that the plurality of hairpin protrusions are exposed upwardly; and a spacer unit movably provided on an upper portion of the main body frame to adjust the distance between the plurality of hairpin protrusions arranged in the radial direction of the stator core.

The coil expansion device of the stator of this embodiment may include a guide unit that is provided on the main body frame outside the stator core to be movable along the radial direction of the stator core and supports lower portions of the plurality of hairpin protrusions.

At this time, the guide unit includes a fixed plate fixed to the main body frame, a moving plate provided on the fixed plate to be able to move back and forth along the radial direction of the stator core, and an end of the moving plate to form the plurality of It may include a guide gripper supporting the lower part of the hairpin protrusion.

The coil spacing device of the stator of this embodiment may include a clamping unit provided on the main body frame outside the stator core to press and support the stator core toward the stator jig unit when adjusting the spacing of the plurality of hairpin protrusions.

At this time, the clamping unit may include a rotating member provided on the main body frame so as to be able to rotate toward the stator core, and a pressure roller provided at an end of the rotating member to press and support the stator core.

Meanwhile, the stator core includes a plurality of cuff jigs supporting hairpin end groups composed of a plurality of hairpin protrusions arranged along the radial direction of the stator core, and is provided on an edge of the plurality of cuff jigs to support the plurality of cuff jigs. It may include a ring jig for fixing the upper surface of the stator core, and in this case, the pressure roller may support the upper surface of the stator core using the ring jig as a medium.

The expansion unit moves along the axial direction of the stator core to enter and grip an upper part of at least one hairpin protrusion from above the plurality of hairpin protrusions, and holds the upper part of the at least one hairpin protrusion while holding the stator core. It may include a spacing tool that moves along the radial direction of the core to adjust the spacing between the plurality of hairpin protrusions.

Here, the expansion unit is provided at the lower part of the expansion tool, moves along the radial direction of the stator core, and enters the side of the at least one hairpin protrusion from the side of the plurality of hairpin protrusions, and enters the entry space of the expansion tool. It may further include an expansion gripper that expands.

At this time, the extended gripper may be made of a plurality of members that are opened or closed to each other along the circumferential direction of the stator core.

In addition, it is preferable that the end of the expansion gripper and the end of the expansion tool are formed in a form that engages with each other.

According to another embodiment of the present invention, a stator loading step of seating the stator on the stator jig unit; A first expansion step of operating the expansion unit to adjust the spacing between a plurality of hairpin protrusions arranged in the radial direction of the stator core; a second expanding step of expanding the entire coil of the stator by repeatedly performing the coil expanding step along the circumferential direction of the stator core while rotating the stator through the stator jig unit; And a stator unloading step of removing the stator from the stator jig unit. A control method of a coil expansion device is provided, including a.

The control method of this embodiment is performed before the stator loading step and includes the steps of supporting hairpin end groups consisting of a plurality of hairpin protrusions arranged along the radial direction of the stator core with a plurality of cuff jigs, and the steps of supporting the plurality of cuff jigs. It may include fixing the plurality of cuff jigs to the stator core by providing a ring jig on the edge.

In addition, the control method of this embodiment includes the steps of rotatably pressing and supporting the stator core with a clamping unit, which is performed after the stator loading step, and the step of rotating the clamping unit from the stator core, which is performed after the second expansion step. It may include a removal step.

Additionally, the control method of this embodiment is performed before the first expansion step and may include supporting lower portions of the plurality of hairpin protrusions with a guide unit.

Meanwhile, the first expansion step includes pre-expanding the entry space of the expansion tool by moving the expansion gripper along the radial direction of the stator core, and moving the expansion tool along the axial and radial directions of the stator core. This may include adjusting the spacing between the plurality of hairpin protrusions.

According to an embodiment of the present invention, the gap between the layers of the stator coil can be adjusted to ensure sufficient insulation distance required for insulation between coil layers, which has the advantage of preventing product defects due to non-insulation between coil layers. There is.

In addition, according to an embodiment of the present invention, the use of additional insulating paper for insulation between existing coil layers can be eliminated, thereby increasing product productivity by eliminating the need for additional work time, and reducing additional costs, thereby reducing manufacturing costs. There are benefits to doing this.

1 is a front view schematically showing a stator coil expansion device according to an embodiment of the present invention.
Figure 2 is a plan view schematically showing the state in which the expansion tool in Figure 1 is removed.
Figure 3a is a perspective view schematically showing the main part on the right side of Figure 1
Figure 4a is a perspective view of the expansion tool of Figure 3a
Figure 4b is a perspective view of the extended gripper of Figure 3a
Figure 4c is a perspective view of the guide gripper of Figure 3a.
Figure 5a is a configuration diagram schematically showing the state in which the guide gripper enters the lower part of the plurality of hairpin protrusions.
Figure 5b is a configuration diagram schematically showing the state in which the expansion gripper enters the upper part of the plurality of hairpin protrusions in the state of Figure 5a.
Figure 5c is a configuration diagram schematically showing the state in which the expansion tool enters the upper part of the plurality of hairpin protrusions in the state of Figure 5b.
FIG. 5D is a configuration diagram schematically showing how the expansion tool adjusts the spacing of a plurality of hairpin protrusions after the expansion gripper retracts in the state of FIG. 5C.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The detailed description below is provided to provide a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and the disclosed embodiments are not limited thereto.

In describing the embodiments, if it is determined that a detailed description of related known technology may unnecessarily obscure the gist of the disclosed embodiments, the detailed description will be omitted. In addition, terms described below are terms defined in consideration of functions in the disclosed embodiments, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification. The terminology used in the detailed description is only for describing embodiments and should in no way be limiting. Unless explicitly stated otherwise, singular forms include plural meanings. In this description, expressions such as “comprising” or “including” are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, and one or more than those described. It should not be construed to exclude the existence or possibility of any other characteristic, number, step, operation, element, or part or combination thereof.

Figure 1 is a front view schematically showing a coil expansion device of a stator according to an embodiment of the present invention, Figure 2 is a plan view schematically showing a state in which the expansion tool in Figure 1 has been removed, and Figure 3 is a main portion on the right side of Figure 1. This is a perspective view that schematically shows. Additionally, FIG. 4A is a perspective view of the expansion tool of FIG. 3A, FIG. 4B is a perspective view of the expansion gripper of FIG. 3A, and FIG. 4C is a perspective view of the guide gripper of FIG. 3A.

1 to 4C, the stator coil expansion device 100 according to an embodiment of the present invention includes a plurality of hairpin protrusions 12a that are inserted into a slot of the stator core 11 and protrude to one end of the slot. -1) It is a device for adjusting the gap between the main body frame 101, which largely forms the exterior, and a stator jig unit 110 provided at the lower part of the main body frame 101 and on which the stator core 11 is seated. and a spacing unit 130 movably provided on the upper part of the main body frame 101 to adjust the spacing between the plurality of hairpin protrusions 12a-1.

The main body frame 101 provides a space in which components such as the stator jig unit 110 and the expansion unit 130 and various components for manipulating and controlling the components are installed, and the center is located at the center. A stator jig unit 110 may be provided, and the spacing units 130 may be provided on both sides around the stator jig unit 110. In this embodiment, the spacing unit 130 is provided on both sides of the stator jig unit 110 to simultaneously adjust the spacing of the plurality of hairpin protrusions 12a-1 on both sides of the stator core 11. However, it is not limited to this, and the expansion unit 130 may be provided only on one side of the stator jig unit 110.

The stator jig unit 110 includes a rotating jig 111 on which the stator core 11 is mounted so that the plurality of hairpin protrusions 12a-1 are exposed upward, and a rotating jig 111 for rotating the rotating jig 111. It may be configured to include components such as a motor (not shown). Here, the rotation jig 111 may be rotated at a predetermined angle along the circumferential direction of the stator core 11 while the stator core 11 is mounted. That is, the stator coil 12 has one hairpin end group 12a made up of a plurality of hairpin protrusions 12a-1 arranged along the radial direction of the stator core 11 and extends along the circumference of the stator core 11. A plurality of continuous coils are provided along the direction to form an entire coil. At this time, the expanding unit 130 adjusts the spacing for each hairpin end group 12a, so that one hairpin end is formed through the expanding unit 130. After the spacing adjustment of the secondary group 12a is completed, the rotation jig 111 is periodically rotated at a predetermined angle to adjust the spacing of another adjacent hairpin end group 12a.

The stator coil expansion device 100 of this embodiment includes a guide unit 120 provided on the main body frame 101 outside the stator core 11 and supporting the lower portions of the plurality of hairpin protrusions 12a-1. may include. Here, the guide unit 120 includes a fixed plate 121 fixed to the main body frame 101, and a fixed plate 121 capable of moving back and forth along the radial direction of the stator core 11. It may be configured to include a movable plate 122 and a guide gripper 123 provided at an end of the movable plate 122 to support the lower portions of the plurality of hairpin protrusions 12a-1. Here, the guide gripper 123 may be formed in the form of a pincer whose end portion consists of a plurality of grip protrusions 123a and a grip groove 123b formed between the plurality of grip protrusions 123a, and thus the movement. When the plate 122 moves forward, the hairpin end group 12a is inserted into the grip groove 123b, and thus the inserted hairpin end group 12a can be supported by the plurality of grip protrusions 123a. At this time, the plurality of grip protrusions 123a may be formed in a tapered shape whose thickness decreases toward the end in order to easily enter between the hairpin end groups 12a, and may be formed in a tapered shape for connection with the hairpin end groups 12a. In order to prevent damage to the coil surface, it is preferable that the surface is treated and/or coated.

The stator coil expansion device 100 of this embodiment is a clamping unit provided on the main body frame 101 outside the stator core 11 to press and support the stator core 11 toward the stator jig unit 110. It may include (140). Here, the clamping unit 140 includes a pivoting member 141 that is rotatable toward the stator core 11, and is provided at an end of the pivoting member 141 to press and support the stator core 11. It may be configured to include a pressure roller 142.

Meanwhile, the stator core 11 prevents deformation due to stress concentration at the lower end of the plurality of hairpin protrusions 12a-1 when the guide unit 120 and the expansion unit 130 are operated, and insulating paper (not shown) is provided in the stator core 11. ) may be provided with a plurality of cuff jigs 21 and ring jigs 22 to prevent damage. That is, a plurality of cuff jigs 21 may be inserted between the hairpin end groups 12a arranged along the circumferential direction of the stator core 11 to support the corresponding hairpin end groups 12a, and the plurality of cuff jigs 21 may be inserted A ring jig 22 is provided on the upper edge of the stator core 11 to surround the edge of the cuff jig 21, so that the plurality of cuff jigs 21 can be fixed and supported.

Accordingly, the above-described clamping unit 140 can press the upper surface of the stator core 11 using the ring jig 22 as a medium. That is, when the clamping unit 140 is operated, the rotating member 141 rotates and the pressure roller 142 is closely pressed to the upper surface of the ring jig 22, thereby pressing the stator core 11 to the stator jig. It can be pressurized and supported toward the unit 110 in an indirect manner.

The expansion unit 130 includes an expansion body 131 provided on the main body frame 101 to be movable in the axial direction and/or radial direction of the stator core 11, and the expansion body 131. It may include an expansion tool 133 that is movable along the axial direction of the stator core 11 via the lowering member 132. Accordingly, the expansion tool 133 descends along the axial direction of the stator core 11 from above the hairpin end group 12a and enters the upper part of the plurality of hairpin protrusions 12a-1, forming at least one The hairpin protrusion 12a-1 may be gripped, and the expanded body 131 moves along the radial direction of the stator core 11 while holding the at least one hairpin protrusion 12a-1. The gap between the gripped hairpin protrusion and the adjacent hairpin protrusion can be adjusted.

In addition, the expansion unit 130 is provided to be movable along the radial direction of the stator core 11 via a forward and backward member 134 on the expansion body 131 on the lower side of the expansion tool 133. It may be configured to further include an expansion gripper 135. In other words, the expanding gripper 135 enters between the hairpin end group 12a and adjacent hairpin end groups whose spacing is to be adjusted by the expanding tool 133 on the side of the hairpin end group 12a and uses the expanding tool By securing a space in advance for the entry of the expansion tool 133, the subsequent entry and spacing adjustment work of the expansion tool 133 can be performed more accurately and easily. As an example, the spreading gripper 135 may be made of a plurality of members that can each enter between hairpin end groups adjacent to the hairpin end group 12a whose spacing is to be adjusted by the spreading tool 133 as the center. Here, the spacing gripper 135 may be made of a pair of members that are opened or closed to each other along the circumferential direction of the stator core 11, and accordingly, the spacing of each member can be adjusted by the spacing tool 133. Centering on the hairpin end group 12a, the hairpin end groups 12a adjacent to the hairpin end group 12a are separated from each other to expand the space for the widening tool 133 to enter, or are closed to each other to allow the space adjustment target hairpin end group 12a to be adjusted. The spacing tool 133 may clamp at least one hairpin protrusion 12a-1 to adjust the spacing. Therefore, by operating the expansion gripper 135, the expansion tool 133 can accurately and easily enter and grip the at least one hairpin protrusion 12a-1 to be spaced. At this time, the end of the expansion gripper 135 and the end of the expansion tool 133 may be formed in a form that engages with each other to facilitate interlocking operation. Meanwhile, the expansion gripper 135 allows the expansion tool 133 to grip at least one hairpin protrusion 12a-1 and to move the spacer in the radial direction of the stator core 11 through the forward and backward member 134. It is desirable to avoid interference with the spacing adjustment operation of the expansion tool 133 by retreating.

On the other hand, after the spacing adjustment of one hairpin end group (12a) is completed by repeated operation of the expansion tool 133 and the expansion gripper 135, the guide gripper 123 is separated from the hairpin end group 12a. ) and the expansion tool 133 and the expansion gripper 135 may retreat or rise to exclude interference, and then the rotation jig 111 is rotated at a predetermined angle to adjust the gap between the hairpin end group 12a and A new spacing adjustment operation of adjacent hairpin end groups can be performed. Ultimately, the spacing adjustment process of the entire plurality of hairpin protrusions 12a-1 constituting the stator coil 12 can be completed by repeatedly performing the widening process while rotating the stator core 11. In this embodiment, the spacing adjustment process can be completed as described above. By simultaneously performing the coil expansion process on both sides around the stator core 11, the coil expansion process can be performed at approximately twice the speed.

Figure 5a is a configuration diagram schematically showing the state in which the guide gripper enters the lower part of the plurality of hairpin protrusions, and Figure 5b is a configuration schematically showing the state in which the expansion gripper enters the upper part of the plurality of hairpin protrusions in the state of Figure 5a. Figure 5c is a configuration diagram schematically showing the state in which the expansion tool enters the upper part of the plurality of hairpin protrusions in the state of Figure 5b, and Figure 5d is a configuration diagram showing the state in which the expansion tool enters the upper part of the plurality of hairpin protrusions in the state of Figure 5c. This is a schematic diagram showing how to adjust the spacing of the hairpin protrusions.

With further reference to FIGS. 5A to 5D, the control method of the coil expansion device according to an embodiment of the present invention will be described as follows.

First, the stator 10 is seated and loaded on the rotating jig 111 of the stator jig unit 110. That is, the stator core 11 is seated on the rotation jig 11 so that the plurality of hairpin protrusions 12a-1 constituting the stator coil 12 are exposed upward.

At this time, the stator 10 may be provided with the plurality of cuff jigs 21 and the ring jig 22. That is, the hairpin end groups 12a consisting of a plurality of hairpin protrusions 12a-1 arranged along the radial direction of the stator core 11 can be supported by a plurality of cuff jigs 21, and the plurality of cuffs A ring jig 22 is provided on the edge of the jig 21 to fix the plurality of cuff jigs 21.

Then, the stator core 11 is pressurized and rotatably supported by the clamping unit 140. That is, the stator core 11 can be pressed and supported toward the rotating jig 111 by rotating the rotating member 141 to press the upper surface of the ring jig 22 with the pressing roller 142.

Next, the lower portion of the hairpin end group 12a, whose spacing is to be adjusted through the expansion unit 130, is supported by the guide unit 120. That is, when the moving plate 122 is operated to enter the guide gripper 123 from the side of the hairpin end group 12a, the lower part of the hairpin end group 12a is inserted into the grip groove 123b. It can be supported by the grip protrusion (123a).

In this state, the expansion unit 130 is operated to perform a first expansion process to adjust the spacing between the plurality of hairpin protrusions 12a-1 corresponding to the hairpin end group 12a. That is, the entry space of the expansion tool 133 can be pre-expanded by moving the expansion gripper 135 along the radial direction of the stator core 11, and then the expansion tool 133 is lowered to The upper part of at least one of the hairpin protrusions 12a-1 is gripped, the expansion gripper 135 is retracted, and the expansion tool 133 is moved along the radial direction of the stator core 11. The distance between the plurality of hairpin protrusions 12a-1 can be adjusted.

Thereafter, the first expansion process is repeated along the circumferential direction of the stator core 11 while rotating the stator core 11 through the rotation jig 111 of the stator jig unit 110, thereby forming the stator coil ( A second widening process is performed to adjust the entire spacing of the plurality of hairpin protrusions 12a-1 forming 12).

As described above, after the entire expansion process of the stator coil 12 is completed, the clamping unit 140 is removed from the stator core 11, that is, the ring jig 22. In other words, the pressure roller 142 is removed from the ring jig 22 by rotating the rotating member 141.

Then, when the stator 10 is removed from the stator jig unit 110 and unloaded, the coil expansion process of this embodiment is completed.

Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the claims and equivalents of the claims as well as the claims described later.

10: stator
11: stator core
12: stator coil
12a: hairpin end group
12a-1: Hairpin protrusion
21: Cuff jig
22: Ring jig
100: Coil expansion device
101: body frame
110: stator jig unit
111: Rotating jig
120: Guide unit
121: fixed plate
122: moving plate
123: Guide gripper
123a: Grip projection
123b: Grip groove
130: expansion unit
131: Expanded body
132: Absence of raising and lowering
133: Expansion tool
134: Absence of forward and backward movement
135: Expansion gripper
140: clamping unit
141: Absence of meeting
142: Pressure roller

Claims (15)

A stator coil expansion device for adjusting the spacing of a plurality of hairpin protrusions inserted into a slot of a stator core and protruding from one end of the slot,
a body frame that forms the exterior;
a stator jig unit provided at a lower portion of the main body frame and on which the stator core is seated so that the plurality of hairpin protrusions are exposed upwardly; and
It includes a spacing unit movably provided on the upper part of the main body frame to adjust the gap between the plurality of hairpin protrusions arranged in the radial direction of the stator core,
A plurality of cuff jigs supporting hairpin end groups composed of a plurality of hairpin protrusions arranged along the radial direction of the stator core, and provided on the edge of the plurality of cuff jigs to attach the plurality of cuff jigs to the upper surface of the stator core. A coil spreading device of a stator further comprising a ring jig for fastening.
In claim 1,
A coil expansion device for a stator, including a guide unit provided on the main body frame outside the stator core to be movable along a radial direction of the stator core, and supporting lower portions of the plurality of hairpin protrusions.
In claim 2,
The guide unit is,
A fixed plate fixed to the main body frame, a movable plate provided on the fixed plate capable of moving back and forth along the radial direction of the stator core, and provided at an end of the movable plate to support lower portions of the plurality of hairpin protrusions. A coil-spreading device on a stator, comprising a guide gripper.
In claim 1,
A coil expansion device for a stator, including a clamping unit provided on the main body frame outside the stator core and pressing and supporting the stator core toward the stator jig unit when adjusting the spacing of the plurality of hairpin protrusions.
In claim 4,
The clamping unit is,
A coil expansion device for a stator, comprising a rotating member provided on the main body frame so as to be able to rotate toward the stator core, and a pressure roller provided at an end of the rotating member to press and support the stator core.
In claim 5,
The pressure roller supports the upper surface of the stator core using the ring jig as a medium.
According to any one of claims 1, 2, and 4,
The expansion unit is,
The stator core moves along the axial direction of the stator core and enters and grips the upper part of the at least one hairpin protrusion from above the plurality of hairpin protrusions, and moves in the radial direction of the stator core while gripping the upper part of the at least one hairpin protrusion. A coil spreading device of a stator, comprising a spreading tool that moves along to adjust the spacing between the plurality of hairpin protrusions.
In claim 7,
The expansion unit is,
It is provided at the lower part of the expansion tool, and moves along the radial direction of the stator core to enter the side of at least one hairpin protrusion from the side of the plurality of hairpin protrusions, and includes an expansion gripper that expands the entry space of the expansion tool. A stator coil expansion device.
In claim 8,
The spreading gripper is a coil spreading device of a stator consisting of a plurality of members that are opened or closed to each other along the circumferential direction of the stator core.
In claim 8,
The coil expansion device of the stator is formed in a form where the end of the expansion gripper and the end of the expansion tool are engaged with each other.
As a method of controlling the coil expansion device of the stator of claim 1,
A stator loading step of seating the stator on the stator jig unit;
A first expansion step of operating the expansion unit to adjust the spacing between a plurality of hairpin protrusions arranged in the radial direction of the stator core;
a second expanding step of expanding the entire coil of the stator by repeatedly performing the coil expanding step along the circumferential direction of the stator core while rotating the stator through the stator jig unit; and
A stator unloading step of removing the stator from the stator jig unit. A control method of a coil expansion device comprising a.
In claim 11,
Performed before the stator loading step, supporting hairpin end groups consisting of a plurality of hairpin protrusions arranged along the radial direction of the stator core with a plurality of cuff jigs, and providing a ring jig on the edge of the plurality of cuff jigs. A method of controlling a coil expansion device comprising the step of fixing the plurality of cuff jigs to the stator core.
In claim 11,
A step of rotatably pressurizing and supporting the stator core with a clamping unit, performed after the stator loading step;
A method of controlling a coil expansion device, performed after the second expansion step and comprising the step of removing the clamping unit from the stator core.
In claim 11,
A method of controlling a coil expansion device, which is performed before the first expansion step and includes the step of supporting lower portions of the plurality of hairpin protrusions with a guide unit.
The method of any one of claims 11 to 14,
The first expansion step is,
Pre-expanding the entry space of the expansion tool by moving the expansion gripper along the radial direction of the stator core, and moving the expansion tool along the axial direction and radial direction of the stator core to increase the gap between the plurality of hairpin protrusions. A method of controlling a coil expansion device, including the step of adjusting.