KR20240031740A - Motor Hairpin Up/Down mechanism for hairpin extension - Google Patents

Abstract

The raising and lowering mechanism 10 for expanding the motor hairpin of the present invention allows the expansion tooth 20 to simultaneously perform movement in the radial direction (R) and movement in the height direction (z) to form a hairpin coil ( The coil strand (300A) of 300) is formed into the expansion part 320, and during the expansion process of the expansion tooth 20, the expansion ring 30 is combined with the jig 40 and moves up and down toward the hairpin coil 300. By supporting this coil strand (300A) and creating an expanded section forming state (300), the stator assembly (100) of the stator (200) and the hairpin coil (300) has a larger diameter compared to the diameter of the hairpin coil (300). It implements features that allow the expansion portion 320 to be formed easily and with high productivity.

Description

{Motor Hairpin Up/Down mechanism for hairpin extension}

The present invention relates to a lifting and lowering mechanism for expanding a motor hairpin, and in particular, to a lifting and lowering mechanism for expanding a motor hairpin in which the expanding portion formed at the lower end of the stator is formed by a 3-axis motion of freedom in cylindrical coordinates (R-Z). will be.

In general, a vehicle's drive motor consists of a stator for magnetic flux generation, a rotor for rotational movement, and a permanent magnet, and generates rotational force as output.

For example, among the above drive motors, the hairpin drive motor applies a “U” or “V” shaped hairpin coil (i.e. conductor) to the coil, thereby reducing the dead space (Dead Dpace) between the stator core and the hairpin coil or hairpin coil when winding the coil. By minimizing it, it is possible to have a structure with a high coil space ratio.

Therefore, the hairpin drive motor is mainly applied as a vehicle power source for eco-friendly hybrid vehicles or electric vehicles by enabling miniaturization of the motor while increasing output proportional to the number of turns of the winding coil with respect to the stator core.

In particular, the hairpin winding drive motor welds the ends of the hairpin coils adjacent to each other in the radial direction within the slots while inserting the hairpin winding coils into each of the stator core slots to implement a set electrical circuit of the hairpin coils.

To this end, the hairpin coil forms a crown part protruding above the stator and a twisting part protruding from the bottom of the stator while assembled in the stator core slot, and the twisting part is first formed as an expansion part before the twisting process.

In particular, the expansion portion has a shape in which the hairpin coil is inserted into the stator core and the end of the coil that protrudes straight from the lower part of the stator is widened compared to the diameter of the stator core through the expansion process. Through this, the amount of expansion of the distance between welds for each hairpin coil is adjusted.

For example, the expansion process is an expansion tool pressing method formed by an expansion part that adjusts the amount of expansion of the distance between welds according to the tool shape of the expansion tool that is pressed in a vertical direction with respect to the end of the straight coil, or inserted into the stator core slot. Before doing this, an example is the expansion molding method in which the expanded section is formed through expansion molding of the hairpin coil itself.

Domestic published patent KR 10-2021-0071576 (June 16, 2021)

However, the expansion molding method has the problem of requiring a separate management system and location for the expansion molded hairpin coils, and the expansion tool pressurization method has no management problems compared to the expansion molding method, but instead expands the distance between the welds of the hairpin coils. This method has a problem in that the degree of freedom of movement is limited because the extension tool for volume control simply moves up and down.

Accordingly, taking the above into consideration, the present invention is a 3-axis degree-of-freedom motion in cylindrical coordinates (R-Z) through a combination of an expansion tooth, an expansion ring, and a jig, and the coil strand, which is the lower protrusion of the hairpin coil assembled on the stator, is The purpose is to provide a lifting and lowering mechanism for expanding a motor hairpin in which an expanding portion having a larger diameter compared to the diameter is easily formed.

The raising and lowering mechanism for expanding the motor hairpin of the present invention to achieve the above object includes: an expanding device for forming a straight coil strand into an expanding portion having a certain inclination; An expansion ring supporting the coil strands; It is characterized in that it includes a jig for raising and lowering the expansion ring.

In a preferred embodiment, the expansion teeth perform N/2 coil formation by binding the N coil strands two each, and the expansion teeth are composed of N/2 pieces relative to the number of hairpin coils, and are formed in an “ㄴ” shape. The “L” shape forms a central space in a 360° circular arrangement.

In a preferred embodiment, the shape of the expansion ring is made of a hollow cylinder, and the number of expansion rings is N/2.

In a preferred embodiment, the jig is made of a hollow cylinder, and the number of jigs is N/2.

In a preferred embodiment, the jig includes a jig groove formed on the surface of the hollow cylinder and a jig lifter provided in the inner space of the hollow cylinder, and the jig groove is formed in N/2 jig grooves in the hollow cylinder. , the jig grooves are provided with entrance protrusions, and the jig grooves are assembled by overlapping each other to form a staggered state.

In a preferred embodiment, the hollow cylinder is provided with jig holders on both left and right sides, and the jig holder guides the hollow cylinder when moving up and down.

In a preferred embodiment, the expansion ring moves in the height direction, and the expansion tooth moves in the radial direction and in the height direction simultaneously.

The raising and lowering mechanism for expanding the motor hairpin of the present invention implements the following actions and effects for hairpin coil forming.

First, a mechanical expansion mechanism can be implemented by generating a 3-axis motion of freedom through the combination of expansion teeth, expansion rings, and jigs. Second, a more effective expansion system can be implemented in forming the expansion portion of the hairpin coil assembled with the stator by using a 3-axis expansion mechanism. Third, the expansion process of the hairpin coil can be performed more efficiently through the 3-axis freedom movement of the expansion mechanism. Fourth, the 3-axis freedom motion forming method can solve both the separate coil management problem of the existing expansion molding method and the limited freedom of movement problem of the expansion tool pressurization method.

Figure 1 is a configuration diagram of a raising and lowering mechanism for expanding a motor hairpin in which a 3-axis degree of freedom motion coil forming method is implemented by a combination of an expansion tooth, an expansion ring, and a jig according to the present invention, and Figure 2 is a configuration diagram of an expansion ring according to the present invention. and a detailed configuration diagram of the jig, and Figures 3 and 4 are examples of the expansion process in which the hairpin coil of the stator assembly according to the present invention is expanded, and Figure 5 is the state of the expansion portion of the stator assembly after the expansion process according to the present invention. am.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached illustration drawings. These embodiments are examples and may be implemented in various different forms by those skilled in the art to which the present invention pertains, so they are described herein. It is not limited to the embodiment.

Referring to Figure 1, the expansion system 1 includes a expansion loading unit 3, a motor hairpin expansion device 5, and a expansion ring unit 7, and the motor hairpin expansion device 5 and the expansion ring unit Some components of (7) constitute a lifting and lowering mechanism (10) for expanding the motor hairpin.

For example, the expansion loading unit 3 provides a frame on which the motor hairpin expansion device 5 and the expansion ring unit 7 are mounted, and loads the stator 200 into which the hairpin coil 300 is inserted and fixes the position, The motor hairpin expander 5 forms an expansion portion in the hairpin coil 300 protruding from the bottom of the expansion loading unit 3 to the lower part of the stator 200, and the expansion ring unit 7 is a motor hairpin It assists the movement when forming the expansion part of the expander (5).

In particular, the expansion loading unit 3 takes into account the spring back after deformation of the coil strand 300A while loading and setting the stator assembly from the upper part of the motor hairpin expansion device 5, and the outer diameter guide 60 moves to hold the hairpin coil 300, and the expansion ring unit 7 moves the inner diameter guide 50 and the expansion ring 50A below the motor hairpin expander 5 to secure the coil strand 300A. It sets the position. In this case, the inner diameter guide 50 is made of a hollow cylinder, and the outer diameter guide 60 is made of a ring-shaped plate.

Therefore, during the expansion operation, the inner diameter guide 50 supports the inner portion of the hairpin coil 300, while the outer diameter guide 60 supports the outer portion. In this case, the inner diameter guide 50 moves up and down toward the hairpin coil 300 through the expansion ring unit 7, and the outer diameter guide 60 moves back and forth toward the hairpin coil 300 through the expansion loading unit 3. It moves and gathers or spreads out.

Specifically, the raising and lowering mechanism 10 for expanding the motor hairpin is an expansion device that forms the expansion portion 320 (see FIG. 5) through primary and secondary coil forming on the coil strand 300A of the hairpin coil 300. (20), an expansion ring 30 that is located between the coil strands (300A) and supports the coil strands (300A) during secondary coil forming of the expansion tooth (20), and an expansion ring (30) that raises and lowers the expansion ring (30) Includes jig (40).

In particular, the raising and lowering mechanism 10 for expanding the motor hairpin generates a 3-axis motion of freedom in xyz coordinates as a linear motion in the R direction and an upward movement in the z direction, and the height movement of the upward movement in the z direction causes the coil of the hairpin coil to move. The strands are intertwined, and the coil strands are opened by the backward movement of the linear motion in the R direction to form the first coil, and the coil strands are pressed together by the forward movement of the linear motion in the R direction, thereby forming the secondary coil. A spacer in which the coil strand is formed into an expanded section through the first coil forming and the second coil forming; An expansion ring supporting the coil strand when forming the secondary coil; And a jig that raises and lowers the expansion ring during the operations of the primary coil forming and the secondary coil forming is included.

In addition, the expansion teeth 20 perform the primary coil forming and the secondary coil forming by grouping two of the plurality of coil strands, and are composed of a plurality according to the quantity of the hairpin coil, and have an “ㄴ” shape. It is formed in a shape, and the “ㄴ” shape forms a central space in a 360° circular arrangement. In this case, the shape of the expansion ring is made of a hollow cylinder, and the quantity of the expansion ring is configured to match the bundle of coil strands used for forming the primary coil.

For example, the stator 200 and the hairpin coil 300 are formed of a stator assembly 100, and the stator assembly 100 has the hairpin coil 300 exposed at the top of the crown portion ( While forming 310), the hairpin coil 300 exposed at the lower part is formed into an expanded section 320. In this case, the expansion portion 320 is then formed into a twisting portion through a twisting process.

Hereinafter, it is assumed that the coil strands 300A of the stator assembly 100 are 10 layers, and the expansion value 20 bundles the coil strands 300A 2 at a time to form N/2 coils. It is explained that the 10 layers are divided into bundles of strands of 10-9, 8-7, 6-5, 4-3, 2-1 and supported by the expansion ring 40 in accordance with the expansion molding operation, and the innermost layer is supported by the expansion ring 40. The 2-1 strand bundle located in is supported by the inner diameter guide (50) rather than the expansion ring (40). Therefore, the expansion value 20 is made up of N/2 compared to the number of hairpin coils 300.

For example, the expansion tooth 20 simultaneously moves linearly in the radial direction (R) and in the height direction (z) among the cylindrical R-Z coordinates during the forming operation of the expansion portion of the hairpin coil 300.

For this purpose, the expansion teeth 20 are made up of a quantity tailored to the coil strands 300A of the hairpin coil 300, and the expansion tooth group is formed with the first to N expansion tooth elements 20A,..., 20N of the same shape. Formed, each of the first to N expanded tooth elements forms an “L” shape with an approximately 80° bending structure of the expanded tooth head with respect to the linear length expanded tooth body portion, and the first to N expanded tooth elements (20A) ,...,20N) are arranged in a 360° circle at predetermined intervals, so that the expansion ring 30 can be raised/lowered into the inner space of the central space formed through the "ㄴ" shape. In this case, the 360° circular arrangement forms the central space, which is the moving passage of the inner diameter guide 50, as an “ㄴ”-shaped inner space.

In particular, the flared tooth 20 forms a spaced space cut in the head of the flared tooth so that the coil strands 300A of the hairpin coil are moved two at a time (e.g., 10-9, 8-7, 6-5, 4). -3) The coil strand 300A of the hairpin coil 300 is inserted and the partition wall 27 (see FIGS. 4 and 5) formed in the space between the expanded teeth is moved backward in the R direction (b) (see FIG. 4). ) can be pulled while the coil strand (300A) of the hairpin coil (300) is pressed and deformed during continuous forward movement in the R direction (d) (see FIG. 5).

In addition, the expansion tooth 20 has a radial guide (not shown) with a radial slot into which the expansion tooth body is inserted at the lower part, and a spiral guide (not shown) with a spiral slot into which the expansion tooth head is inserted at the upper part. can be combined

Through this, the expansion tooth 20 can easily form forward and upward movement and retreat and downward movement with a forward and backward motion (R direction) and a height-raising motion in the z direction through a spiral guide during the expansion portion forming operation. , At the same time, the forward and backward motion (R direction) can be radially and stably guided through the radial guide.

For example, the expansion ring 30 is positioned between the coil strands 300A forming the hairpin coil 300, thereby being positioned between the coil strands 300A spread apart by the expansion teeth 20. In this case, the expansion ring 30 is placed on the top of the jig 40 and moves up and down through the jig 40.

For example, the jig 40 is operated to raise the expansion ring 30 toward the coil strand 300A during the expansion part forming operation, and after the expansion part forming operation is completed, the expansion ring 30 is removed from the coil strand 300A. It works to give. In this case, the jig 40 supports the lower end of the expansion ring 30 and moves the expansion ring 30 up and down through an upward and downward movement by the jig lifter 45 (see FIG. 2).

Therefore, during the expansion part forming operation, the jig 40 is operated, and the expansion ring 30 is moved in height in the z-direction height raising motion through the jig 40, thereby forming a coil strand ( 300A) is supported. In this case, the raising and lowering operations of the expansion ring 30 and the jig 40 are repeated until the coil strand 300A is completely formed into the expansion portion 330.

For example, the inner diameter guide 50 is moved up and down toward the hairpin coil 300 through the expansion ring unit 7 and is positioned into the inner space of the hairpin coil 300 from the bottom of the motor hairpin expansion device 5, thereby allowing the coil strand (300A), the innermost 2-1 strand bundle is supported internally. And the outer diameter guide 60 is moved forward and backward toward the coil strand 300A of the hairpin coil 300 through the expansion loading unit 3, and is gathered or spread to form the outermost 10-9 strand of the coil strand 300A. The bundle externally supports the upper section of the coil strands 300A.

Therefore, during the expansion part forming operation, the inner diameter guide 50 supports the inner portion of the hairpin coil 300, while the outer diameter guide 60 supports the outer portion, and in particular, the outer diameter guide 60 supports the expanded tooth ( This contributes to preventing spring back after deformation of the expanded portion 330 of the coil strand 300A by the first and second coil forming in 30).

Meanwhile, Figures 2 and 3 illustrate detailed structures of the expansion ring 30 and the jig 40.

Referring to the expansion ring 30 in FIG. 2, the expansion ring 30 is made of a hollow cylinder, and the hollow cylinder is located between the coil strands 300A forming the hairpin coil 300. As a result, it is configured according to the quantity excluding the coil strands located on the outer and inner sides.

Therefore, the quantity of the expansion rings 30 can be variably configured to match the bundle of coil strands 300A used by the expansion teeth 20 in forming the primary coil.

For this purpose, the expansion ring 30 forms an expansion ring group with first to n expansion ring elements 30a,...,30n of the same shape, and the first expansion ring element 30a is formed as an outer expansion ring. While using the nth widening ring element 30n as an inner widening ring, the second to n-1 widening ring elements 30b,...,30n-1 are formed between the first and n widening ring elements 30a and 30n. They are placed sequentially on top of each other.

For example, the first to n extended ring elements (30a,...,30n) have coil strands (300A) divided into bundles of 10-9,8-7,6-5,4-3,2-1 strands. In the case of 10 layers (Layer), it is composed of four: a first wide ring element (30a), a second wide ring element (30b), a third wide ring element (30c), and a fourth wide ring element (30d). In this case, when the first widening ring element 30a is an outer hollow cylinder, the second widening ring element 30b is inserted into the first widening ring element 30a, and the second widening ring element 30b ) is fitted with a third widening ring element (30c), and a fourth widening ring element (30d) is fitted into the third widening ring element (30c), and the inner space of the fourth widening ring element (30d) is cylindrical. The inner diameter guide 50 is used as a passage for moving up and down.

In particular, each of the first to n expansion ring elements (30a,...,30n) supports the coil strand (300A) during the secondary coil forming operation of the expansion tooth (30) and supports the coil strand (300A) according to the deformation of the coil strand (300A). An extended ring end (see FIG. 3) having a shape that prevents spring back is formed.

Referring to the jig 40 in FIG. 2, the jig 40 is made of a hollow cylinder, and the hollow cylinder supports the lower end of the expansion ring 30 at its upper end, thereby forming the expansion ring 30. It is configured according to the quantity.

Therefore, the quantity of the jigs 40 can be variably configured to match the quantity of the expansion rings 30. In this case, the number of expansion rings 30 is N/2.

For this purpose, the jig 40 forms a jig group with first to n jig elements 40a,...,40n of the same shape, and the nth jig element is formed with the first jig element 40a as the outer jig. Using (40n) as an inner jig, the second to n-1 jig elements (40b,..., 40n-1) are sequentially overlapped and positioned between the first and n jig elements (40a, 40n). In this case, the number of jigs 40 is N/2.

For example, the first to n jig elements (40a,...,40n) are the first jig when the expansion ring 30 is composed of four first to fourth expansion ring elements (30a, 30b, 30c, 30d). It consists of four elements: an element 40a, a second jig element 40b, a third jig element 40c, and a fourth jig element 40d. In this case, when the first jig element 40a is an outer hollow cylinder, a second jig element 40b is inserted into the first jig element 40a, and a third jig element 40b is inserted into the second jig element 40b. A jig element 40c is inserted, and a fourth jig element 40d is inserted into the third jig element 40c, and the inner space of the fourth jig element 40d is occupied by a cylindrical inner diameter guide 50. It is used as a passage for downward movement.

Therefore, the first jig element 40a raises and lowers the first wide ring element 30a, the second jig element 40b raises and lowers the second wide ring element 30b, and the third jig element (40c) raises and lowers the third extended ring element (30c), and the fourth jig element (40d) raises and lowers the fourth extended ring element (30d).

In particular, the jig 40 forms a jig groove 41. In this case, the first to n jig grooves 41a,...,41n of the jig groove 41 are aligned with the first to fourth jig elements 40a, 40b, 40c, and 40d. , 41b, 41c, and 41d), and the first to fourth jig grooves (41a, 41b, 41c, and 41d) are applied to each of the first to fourth jig elements (40a, 40b, 40c, and 40d).

For example, the first to fourth jig grooves (41a, 41b, 41c, and 41d) are the first jig groove (41a), the second jig groove (41b), and the third jig groove (41a), which have a vertically cut slot shape with a rotational gap between them. It is divided into a jig groove (41c) and a fourth jig groove (41d), and the second, third, and fourth jig grooves (41b, 41c, and 41d) all have a slot length that matches the raising and lowering length of the expansion ring (30). On the other hand, the first jig groove 41a has a slot length into which the protruding boss of the jig lifter 45 can be inserted.

Therefore, the first to fourth jig grooves (41a, 41b, 41c, 41d) are assembled by stacking the first to fourth jig elements (40a, 40b, 40c, 40d), that is, the hollow cylinder is a jig groove ( In a state where 41a, 41b, 41c, 41d) are assembled on top of each other to form a staggered state, the first to fourth jig grooves 41a, 41b, 41c, 41d of the first jig element 40a, and the second jig The first to fourth jig grooves (41a, 41b, 41c, 41d) of the element (40b), the first to fourth jig grooves (41a, 41b, 41c, 41d) of the third jig element (40c), and the fourth jig element ( The first to fourth jig grooves (41a, 41b, 41c, and 41d) of 40d) form a staggered state at the rotation interval, so that when the first jig element (40a) moves up and down, the second to fourth jig elements ( There is no interference from 40b, 40c, 40d).

In addition, the jig 40 is provided with an entrance protrusion 42, a jig lifter 45, and a jig holder 47, and the entrance protrusion 42 has first to fourth jig grooves 41a, 41b, 41c, and 41d. It is formed in the first jig groove 41a, and the jig lifter 45 is located in the inner space of the fourth jig element 40d among the first to fourth jig elements 40a, 40b, 40c, and 40d.

For example, the entrance protrusion 42 is located at the lower part of the first jig groove 41a, and the entrance protrusion 42 supports the protrusion boss of the jig lifter 45, thereby supporting the protrusion boss when the jig lifter 45 is lowered. The expansion ring (30) can be lowered.

For example, the jig lifter 45 converts the rotational power of a motor (not shown) into the rotational movement of a ball-nut and the movement of a ball-spline to raise and lower the vertical moving part, and the vertical moving part is a protruding boss formed on the left and right. forms.

Therefore, the rotational movement of the ball-nut causes the protruding boss to be positioned in the first jig groove (41a) by rotating the vertical moving part at an angle equal to the rotation interval, and the movement of the ball-spline moves the inlet protrusion 42 downward. It creates a downward movement of the corresponding expansion ring (30).

For example, the jig holder 47 consists of a left jig holder and a right jig holder, and is inserted into the holder slots formed left and right symmetrically on each of the first to fourth jig elements 40a, 40b, 40c, and 40d, thereby forming the first jig holder. To 4, a space in which the jig lifter 45 rotates can be formed below the jig 40 while stably guiding the up and down movement of the jig elements 40a, 40b, 40c, and 40d.

Meanwhile, Figures 3 and 4 are examples of the process of expanding the hairpin coil 300 for the stator assembly 100 of the elevating and lowering mechanism 10 for expanding the motor hairpin, and the expanding process includes stator assembly loading (A) ) -> Extension tooth hairpin pulling movement motion of the first coil forming (B) -> Jig upward movement motion (C) -> Extension tooth hairpin pressing movement motion of the second coil forming (D) -> Jig descending movement motion (E ) is carried out. In this case, “->” refers to the process progress order.

In the stator assembly loading (A) of FIG. 3, the spread loading unit 3 loads and sets the stator assembly 100 from above the motor hairpin spreader 5 after deformation of the coil strand 300A. The hairpin coil 300 is held by moving the outer diameter guide 60 to prevent spring back, and the expansion ring unit 7 is connected to the inner diameter guide 50 at the bottom of the motor hairpin expansion machine 5. Move the expansion ring (30A) to support and position the coil strand (300A).

In particular, the inner diameter guide 50 moves up and down toward the hairpin coil 300 through the expansion ring unit 7, and the outer diameter guide 60 moves forward and backward toward the hairpin coil 300 through the expansion loading unit 3. It moves and gathers or spreads out.

Therefore, the stator assembly loading (A) creates a state in which the inner portion of the hairpin coil 300 is supported by the inner diameter guide 50 and the outer portion is supported by the outer diameter guide 60.

Hereinafter, the coil strand 300A of the stator assembly 100 will be described as consisting of 10 layers, and the first to N extended tooth elements 20A,...,20N of the extended tooth 20 The simultaneous movement is explained by the expansion device 20, and the expansion ring 30 is configured to form 10 layers as the expansion device 20 performs the expansion forming operation by bundling the coil strands 300A two at a time. It is explained as being supported by strand bundles of 9,8-7,6-5,4-3, and 2-1, and the innermost 2-1 strand bundle is an inner diameter guide (50) rather than an expansion ring (30). It is explained as supported by .

In particular, the expansion ring 30 moves in the height direction (z), and the expansion device 20 simultaneously performs movement in the radial direction (R) and movement in the height direction (z).

In the expanded tooth hairpin pulling movement motion (B) of the primary coil forming of FIG. 3, the expanded tooth 20 moves forward/z-axis height upward in the expanded tooth R direction (a) and moves backward in the expanded tooth R direction (b) ) is performed. In this case, the forward gap in the R direction/z-axis height increase movement (a) is performed by the pinion-rack gear unit (not shown) of the power transmission unit using the rotational force (e.g., clockwise) due to the driving of the motor (not shown). It is generated by transmitting it to the expansion value (20).

For example, the expansion tooth 20 is moved by a motor in a state in which the radial structure and the spiral structure are combined with a guide (not shown) formed radially, thereby moving the expansion tooth R in the direction R. Direction (Radial Direction) Along with linear motion, it generates upward movement in the z-direction for upward movement in the z-axis height.

Then, the expanded tooth 20 is moved toward the coil strand 300A of the hairpin coil 300, so that the coil strand 300A is inserted into the expanded tooth space of the expanded tooth head. In this case, the outermost two strands (i.e., 10-9) of the 10 layers of the coil strand (300A) are inserted into the space between the spacers.

Subsequently, the retraction movement (b) in the R direction of the expanded tooth is performed by transmitting the reverse rotation of the motor (e.g., counterclockwise) to the expanded tooth 20, so that the expanded tooth 20 is inserted into the spiral slot and moves to the cylindrical coordinates by the spiral shape. It is implemented by generating a retreat movement, which is a linear movement in the R direction (Radial Direction).

Then, the expansion tooth 20 restrains the coil strand 300A through the partition wall 27 and spreads the coil strand 300A outward by the retreating distance, and through this, the first coil forming is completed.

In the jig upward movement motion (C) of FIG. 3, the expansion ring 30 and the jig 40 perform a jiglifter forward rotation (a) and a jiglifter rise (b). In this case, the jiglifter forward rotation (a) and the jiglifter rise (b) drive another motor (not shown) so that the ball-nut/ball-spline vertical moving part of the jig lift 45 rotates forward (e.g., It is generated by moving up and down (clockwise).

For example, in the jig 40, the ball-nut of the ball-nut/ball-spline vertical moving part is rotated clockwise by a motor, so that the protruding boss of the jig lifter 45 is connected to the first jig element 40a. It is rotated toward the entrance protrusion 42 of the first jig groove 41a. In this case, the rotation of the first jig groove (41a) continues until the entrance protrusion 42 of the first jig groove (41a) passes the protrusion boss of the jig lift 45 and reaches the first jig groove (41a). It is stopped after

As a result, the first jig element 40a is in a state where it can be lifted up and down by the jig lifter 45 through the first jig groove 41a, and through this, the operation of the jig lifter forward rotation (a) is completed.

Next, the jig 40 converts the rotational force of the ball-spline motor of the ball-nut/ball-spline vertical moving part into movement, so that the protruding boss of the jig lifter 45 is raised together through the first jig groove 41a. Through this, the operation of the Zigrifter rise (b) is completed. In this case, since the first to fourth jig elements 40a, 40b, 40c, and 40d are staggered at rotation intervals, the first jig element 40a can perform an upward movement without interference.

As a result, the first jig element 40a raises the corresponding first ring element 30a, and the first ring element 30a extends 10 of the coil strands 300A of the hairpin coil 300. It is located between the -9 strand bundle and the 8-7 strand bundle (see Figure 5).

Continuing, in the expanded tooth hairpin pressing movement motion (D) of the secondary coil forming of FIG. 4, the expanded tooth 20 performs a forward movement in the expanded tooth R direction (c) and a continuous forward movement in the expanded tooth R direction (d). Perform. In this case, the forward movement in the R direction (c)/continuation of forward movement (d) is the rotational force (e.g., clockwise) caused by the driving of the motor (not shown) of the pinion-rack gear unit (not shown) of the power transmission unit. ) is generated by being transmitted to the expansion value (20).

For example, the expansion tooth 20 is driven by a motor in a state in which the radial/spiral structure is combined with a radially formed guide (not shown) to perform forward movement in the direction R of the expansion tooth (c), and the motor continues to drive. By continuing the forward movement in the R direction (d), 10-9 strands of the coil strand (300A) are formed into a secondary coil.

That is, in the forward movement (c)/continuation of forward movement (d) in the R direction of the x-y axis of the widening tooth, the widening tooth 20 is pushed toward the first widening ring element 30a, thereby 10- of the coil strand 300A. The 9 strands are deformed into the shapes of the ring tip portions 31, 32, 33 and ring step portions 34, 35 formed on the first expansion ring element 30a through the pressing force of the partition wall 27.

This deformation of the 10-9 strands of the coil strand (300A) is supported by the upward inclination angle of the upper inclined surface 301 and the straight surface of the coil support section 32, and the downward inclination angle of the lower inclined surface 33 is the bending starting point. This is accomplished through a process of entering the groove-shaped step depth of the coil contact section 34 and the lower step surface 35.

In this secondary coil forming process, the lower inclined surface 33 of the ring ends 31, 32, and 33 reduces deformation fatigue of the 10-9 strand due to bending of the 10-9 strand of the coil strand 300A, and the The groove-shaped step depth of the coil contact section 34 and the lower step surface 35 of the ring step portions 34 and 35 is 10-9 strands, which is greater than the diameter of the final expanded portion 330 (see FIG. 5). By deforming to a small diameter, the spring back phenomenon can be reduced when the pressing force on the 10-9 strand is removed.

Then, the controller (not shown) operates the motor ( (not shown) is driven in reverse order to return the extension tooth 20 to its initial position, and then the extension process for 8-7 strands of the coil strand 300A is continued with the extension hairpin pulling movement motion (B) Repeat again with the hairpin pressing exercise motion (D), and perform this repetitive motion for all 6-5, 4-3, 2-1 strands.

Finally, in the jig lowering motion (E) of FIG. 4, the expansion ring 30 and the jig 40 perform jiglifter reverse rotation (c) and jiglifter lowering (d). In this case, the jiglifter reverse rotation (c) and the jiglifter lowering (d) move the ball-nut/ball-spline of the jig lift 45 up and down in the reverse order of the motor drive in the forward rotation (a)/rising (b). It is generated by reverse rotation (e.g. counterclockwise) and downward movement.

For example, the reverse rotation (c) of the jiglifter is performed by forward rotation (eg, clockwise) and reverse rotation (eg, counterclockwise) of the motor.

That is, in the jig 40, the ball-nut of the ball-nut/ball-spline vertical moving part is rotated forward (e.g., clockwise) by the motor, so that the protruding boss of the jig lifter 45 is in contact with the inlet protrusion 42. is further rotated toward the first jig groove (41a) of the first jig element (40a), and then the jig (40) rotates the ball nut of the ball-nut/ball-spline up/down moving part in reverse (e.g., in reverse) with a motor. clockwise), the protruding boss of the jig lifter 45 can be inserted into the first jig groove 41a of the first jig element 40a. In this case, the forward rotation of the jig lifter 45 continues until the protruding boss is located in the first jig groove 41a and then stops, and the reverse rotation of the jig lifter 45 causes the protruding boss to be positioned in the first jig groove 41a. It continues until it comes into contact with the entrance protrusion 42 inside (41a) and then stops.

As a result, the first jig element 40a is in a state where it can be lowered to the jig lifter 45 in contact with the entrance protrusion 42 of the first jig groove 41a, and through this, the jig lifter reverse rotation (c) The operation is completed.

Then, the jig 40 converts the reverse rotation force of the ball-spline motor of the ball-nut/ball-spline vertical moving part into movement, so that the protrusion boss of the jig lifter 45 is connected to the entrance protrusion 42 of the first jig groove 41a. It descends while pressing and, through this, the operation of the jiglifter descent (d) is completed. In this case, since the first to fourth jig elements 40a, 40b, 40c, and 40d are staggered at rotation intervals, the first jig element 40a can perform a lowering operation without interference.

As a result, the first jig element 40a lowers the corresponding first ring element 30a, and the first ring element 30a is connected to 10 of the coil strands 300A of the hairpin coil 300. It comes out between the -9 strand bundle and the 8-7 strand bundle.

Then, the controller (not shown) performs the jig upward movement motion (C) when the first and second coil forming operations of the expansion teeth (20) for 8-7 strands of the coil strands (300A) of the hairpin coil (300) are resumed. and jig lowering motion (E) are repeated again, and this repetitive motion is performed for all 6-5, 4-3, and 2-1 strands.

Meanwhile, referring to FIG. 5, among the hairpin coils 300 of the stator assembly 100, the coil strands 300A exposed to the lower part of the stator 200 form an expansion portion 320, and the expansion portion 320 ) of the expanded section forming state 330 is illustrated.

As shown, the expanded portion forming state 330 is a coil bending section 330a and the expanded ring 30 that are modified using the ring ends 31, 32, and 33 (see FIG. 3) of the expanded ring 30. It is divided into a modified coil end (330b) using ring steps (34, 35) (see FIG. 3).

Therefore, the expansion portion 320 is formed to have a larger diameter than the diameter of the hairpin coil 300 by spreading the hairpin coil 300 to the coil end 330b through the coil bending section 330a.

As described above, the raising and lowering mechanism 10 for expanding the motor hairpin according to the present embodiment has the expanding tooth 20 simultaneously performing movement in the radial direction (R) and movement in the height direction (z), By secondary coil molding, the coil strands 300A of the hairpin coil 300 are formed into the expansion portion 320, and when working on the expansion process of the expansion teeth 20, they are combined with the jig 40 and raised and lowered toward the hairpin coil 300. The moving expansion ring 30 supports the coil strand 300A and creates the expansion state 300, so that the hairpin coil 300 is connected to the stator assembly 100 of the stator 200 and the hairpin coil 300. The expansion portion 320 having a larger diameter compared to the diameter can be manufactured easily and with high productivity.

1: expansion system 3: expansion loading unit
5: Motor hairpin expander 7: Expansion ring unit
10: Elevating and lowering mechanism for expanding the motor hairpin
20: Expansion value 20A,...,20N: 1st to N expansion value elements
27: bulkhead 30: expansion ring
30a,...,30n: 1st to n expansion ring elements
40: Jig 40a,...,40n: 1st to n jig elements
41: Jig grooves 41a,...,41n: 1st to n jig grooves
42: Entrance projection 45: Jig lifter
50: inner diameter guide 60: outer diameter guide
100: stator assembly 200: stator
300: Hairpin coil 300A: Coil strand
310: crown part 320: expansion part
330: Expanded section forming state 330a: Coil bending section
330b: coil end

Claims (11)

An extension tool that forms straight coil strands into an extension part with a certain inclination;
An expansion ring supporting the coil strands;
A jig that raises and lowers the expansion ring;
A lifting and lowering mechanism for expanding the motor hairpin, comprising:
In claim 1,
A lifting and lowering mechanism for expanding the motor hairpin, characterized in that the expanding device performs N/2 coil forming by binding the N coil strands into two each.
In claim 1,
The raising and lowering mechanism for expanding the motor hairpin, characterized in that the expansion value is N/2 of the number of the hairpin coils.
In claim 3,
The above-mentioned expansion is formed in an “ㄴ” shape,
The “ㄴ” shape forms a central space in a 360° circular arrangement.
A lifting and lowering mechanism for expanding the motor hairpin, characterized in that.
In claim 1,
The shape of the expansion ring is made of a hollow cylinder,
A lifting and lowering mechanism for expanding the motor hairpin, characterized in that the number of expansion rings is N/2.
In claim 1,
The jig is made of a hollow cylinder,
A lifting and lowering mechanism for expanding the motor hairpin, characterized in that the number of jigs is N/2.
In claim 6,
The jig is a lifting and lowering mechanism for expanding the motor hairpin, characterized in that it includes a jig groove formed on the surface of the hollow cylinder and a jig lifter provided in the internal space of the hollow cylinder.
In claim 7,
The jig groove is a lifting and lowering mechanism for expanding the motor hairpin, characterized in that N/2 jig grooves are formed in the hollow cylinder, and the jig groove is provided with an entrance protrusion.
In claim 7,
The hollow cylinder is a lifting and lowering mechanism for expanding the motor hairpin, characterized in that the jig grooves are overlapped and assembled to form a staggered state.
In claim 7,
The hollow cylinder is provided with jig holders on both left and right sides,
The jig holder guides the hollow cylinder when moving up and down.
A lifting and lowering mechanism for expanding the motor hairpin, characterized in that.
In claim 1,
The expansion ring moves in the height direction,
A lifting and lowering mechanism for expanding a motor hairpin, characterized in that the expansion device can simultaneously perform radial movement and height direction movement.