JP6504037B2 - Pressing method of double layer wound coil - Google Patents

Description

  The present invention relates to a pressing method of a two-layer wound coil in which a square wire coil is wound in two layers inside and outside so that a plan view is rectangular and a side view is trapezoidal.

  In the two-layer wound coil provided on the stator of the motor, the square wire coil is wound in two layers inside and outside in a rectangular shape in a plan view and in a trapezoidal shape in a side view, and the side portion set in advance is An innermost layer and an outermost layer forming a layer displacement portion and an intermediate layer located between the innermost layer and the outermost layer are provided. In order to reduce the thickness of such a two-layer wound coil, for example, as shown in FIG. 12A, the two-layer wound coil 103 is sandwiched and pressed by the upper mold 101 and the lower mold 102. Incidentally, it is assumed that the uppermost stage of the two-layer winding coil is the first row, and the number of rows increases as going downward (see FIG. 5).

Revised 2012-160689

  As shown in FIG. 12 (a), the pressing surfaces of the upper mold 101 and the lower mold 102 are flat, and the two-layer wound coil 103 is trapezoidal in side view. Therefore, as shown in FIG. 12 (b), when the two-layer coil 103 is pressed, the square wire coil 103a (especially, the one surrounded by a broken line in FIG. 12 (b)) The strain is concentrated on the inner peripheral side of the square coil 103a) of the outer layer in the row. Therefore, as shown in FIGS. 13A and 13B, the square wire coil 103a in the vicinity of the coil end in the first row of the two-layer wound coil 103 opens outward. Incidentally, in FIG. 12 and FIG. 13, dark portions in the square wire coil 103 a are portions where distortion is concentrated.

  The present invention has been made to solve such a problem, and a two-layer winding capable of suppressing an outward opening of a square wire coil near the coil end in the first row of the two-layer wound coil. A method of pressing the coil is realized.

According to an embodiment of the present invention, in the pressing method of a two-layer wound coil, a square wire coil is wound in two layers inside and outside so that a plan view is rectangular and a side view is trapezoidal, and a preset side The upper surface of a two-layer wound coil provided with an innermost layer and an outermost layer forming a layer displacement portion and an intermediate layer positioned between the innermost layer and the outermost layer is pressed by a mold Method,
An inclined surface which inclines inward is formed on the coil pressing surface of the mold, and the inclined surface is brought into contact with a portion linearly extending from the coil end of the square wire coil to make the two-layer wound coil Press.

  According to the present invention, it is possible to realize the pressing method of the two-layer wound coil which can suppress the outward opening of the square wire coil in the vicinity of the coil end in the first row of the two-layer wound coil.

It is a perspective view which shows one Embodiment of the two-layer winding coil applied to the press method of embodiment. It is a side view of a two-layer winding coil applied to a pressing method of an embodiment. It is a top view of the two-layer winding coil applied to the pressing method of an embodiment. It is a perspective view which cuts and shows the 1st side of the two-layer winding coil applied to the pressing method of an embodiment. It is sectional drawing which shows the 3rd and 4th side part of the 2 layer winding coil applied to the press method of embodiment. It is a perspective view which shows typically the lamination | stacking thickness adjustment apparatus applied to the press method of embodiment. It is a front view which shows typically the lamination | stacking thickness adjustment apparatus applied to the press method of embodiment. It is an enlarged perspective view which shows typically the lamination | stacking thickness adjustment apparatus applied to the press method of embodiment. It is a side view showing typically a lamination thickness control device applied to a pressing method of an embodiment. It is an enlarged perspective view which shows typically the state which closed the metal mold | die of the upper and lower sides in the lamination | stacking thickness adjustment apparatus applied to the pressing method of embodiment. It is a figure which shows distribution of distortion of the two-layer winding coil pressed by the press method of embodiment. (A) is sectional drawing which shows distribution of distortion of the 2 layer winding coil pressed by the pressing method of related technology. (B) is an enlarged view of the XII part of FIG. 12 (a). (A) is a top view which shows distribution of distortion of the two-layer winding coil pressed by the pressing method of related technology. (B) is an enlarged view of the XIII part of FIG. 12 (a).

  BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the method for pressing a two-layer wound coil according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 5, the double-layered coil 1 has a rectangular shape when viewed in the vertical direction (stacking direction), and a square wire coil 2 having two layers inside and outside so as to form a trapezoid when viewed from the front-rear direction. It is an edgewise coil wound to become. The two-layer wound coil 1 includes first and second side portions A and B forming short sides and third and fourth side portions C and D forming long sides as viewed in the vertical direction. It has a rectangular shape, and connection terminals 1a and 1b are provided at the top and the bottom. In addition, as the square wire coil 2, any of a "flat wire coil" and a "true square wire coil" is applicable.

  In the first side A, the innermost layer 3 forming a hierarchical displacement portion by the crossover portion 3a, the outermost layer 4 forming the hierarchical displacement portion by the crossover portion 4a, and the innermost layer 3 and the outermost layer 4 And an intermediate layer 5 located. In the second to fourth side portions B, C, D, there is no layer displacement portion, and the inner side layers 6a, 7a, 8a and the outer side layers 6b, 7b, 8b are provided. Although such a two-layer wound coil 1 is formed while bending the short side of the square wire coil 2 at a right angle with a cylindrical pin body, the winding method of the two-layer wound coil 1 is already known Therefore, the explanation here is omitted.

  In the two-layer wound coil 1 having such a configuration, a gap is generated between the square wire coils 2 in the vertical direction after completion of bending and forming, and this gap causes variation in the lamination thickness of the two-layer wound coil 1 I am doing it. Then, in order to make this lamination thickness into a required size, it becomes necessary to adjust lamination thickness.

  As shown in FIGS. 6 to 9, the lamination thickness adjusting device 10 of the two-layer wound coil 1 is a mold comprising a lower mold 11 fixed on a base (not shown) and an upper mold 12 capable of moving up and down. It is equipped with thirteen. The lower mold 11 has a concave accommodation space 14 for accommodating the two-layer wound coil 1 after completion of the winding and forming. The accommodation space 14 has a trapezoidal cross-sectional shape that expands in the left-right direction of the lower mold 11 as it goes upward, and extends in the front-rear direction of the lower mold 11.

  A coil pressing surface 15 is provided at the center of the upper mold 12. The coil pressing surface 15 is provided with a center protrusion 16 which is inserted into the central opening 1 c (see FIG. 3) of the two-layer winding coil 1. The center protrusion 16 has a trapezoidal cross-sectional shape that narrows downward as the upper die 12 is viewed from the front-rear direction, and extends in the front-rear direction of the upper die 12. That is, the center protrusion 16 has a substantially square frustum shape.

  The coil pressing surface 15 is provided with a first convex portion 17 disposed in an L-shape in the vicinity of a corner of the center protrusion 16. The main purpose of the coil pressing surface 17a of the first convex portion 17 is to apply a load from above and below to the intermediate layer 5 located between the connection terminals 1a and 1b at the first side portion A, but at the time of pressing To a position corresponding to the end of the inner layer 8a of the fourth side D in order to balance the pressure.

  Further, the coil pressing surface 15 is formed with a second convex portion 18 extending to the rear of the center protrusion 16. The coil pressing surface 18a of the second convex portion 18 is mainly intended to apply a load to the inner layer 6a in the vertical direction at the second side B, but in order to balance the pressure at the time of pressing The outer layer 6b of the second side B also extends so as to be able to apply a load from the vertical direction.

  Further, the coil pressing surface 15 is formed with an inclined surface 19 which is inclined inward of the upper mold 12. The inclined surface 19 becomes lower as it goes from the inner side to the outer side. Such an inclined surface 19 extends, for example, in the front-rear direction of the upper mold 12, and in the first row, the outer layer 8b linearly extending from the connection terminal 1a (coil end) (hatching in FIGS. 1 and 2) The purpose is to apply a larger load to the portion on the outer peripheral side of the part) than to the portion on the inner peripheral side of the outer layer 8b. Therefore, the formation position of the inclined surface 19 is appropriately changed according to the shape of the two-layer winding coil 1.

  When mold closing is performed by the upper mold 12 and the lower mold 11 having such a configuration, as shown in FIG. 10, the upper mold 12 is lowered to a predetermined height. After the mold closing is completed, both ends in the vertical direction of the two-layer wound coil 1 are sandwiched by the press pressure with the bottom surface of the concave accommodation space 14 of the lower mold 11 and the coil pressing surface 15 of the upper mold 12. Is subjected to a predetermined pressing pressure.

  At this time, the intermediate layer 5 located between the innermost layer 3 and the outermost layer 4 forming the layer displacement portion is locally enhanced by the coil pressing surface 17 a of the first convex portion 17 in the upper mold 12. A load is applied. Thereby, when adjusting the lamination thickness of the two-layer winding coil 1, the press pressure is mainly increased in the intermediate layer 5, and the lamination thickness of the two-layer winding coil 1 can be efficiently adjusted by this. The pressing pressure at the time of molding can be reduced as much as possible without requiring a pressing pressure. And it can suppress that damage generate | occur | produces in the coating | coated part of the square wire coil 2 by reduction of load.

  Further, by pressing the inner layer 6 a of the second side B mainly with the coil pressing surface 18 a of the second convex portion 18 in the upper die 12, the pressure balance of the intermediate layer 5 by the first convex portion 17 is achieved. While taking it, uniform lamination thickness adjustment can be performed.

  Furthermore, by pressing the outer layer 8b linearly extending from the connection terminal 1a in the first row on the inclined surface 19 of the upper die 12, the outer peripheral portion of the outer layer 8b is pressed on the inner peripheral side of the outer layer 8b. A large load is applied compared to the part. As a result, as shown in the part surrounded by the broken line in FIG. 11, the strain is concentrated on the outer peripheral side of the outer layer 8b. By the way, in FIG. 11, the dark part in the square wire coil 2 is a part where distortion is concentrated.

  By applying such a pressing method of the two-layer wound coil 1, distortion can be concentrated on the portion on the outer peripheral side of the outer layer 8 b linearly extending from the connection terminal 1 a in the first row. It is possible to suppress the outward opening.

  Further, for example, in adjusting the lamination thickness of the two-layer wound coil 1, when the first and second convex portions 17 and 18 do not exist, for example, a press pressure of 100 kN is required. When the convex portions 17 and 18 are employed, the two-layer wound coil 1 can be adjusted to an appropriate lamination thickness with a half press pressure.

  Here, as shown in FIG. 6 and the like, it is preferable that the lower mold 11 includes a movable stage 11 a that can move up and down in the accommodation space 14, and the movable stage 11 a configures the bottom surface of the accommodation space 14. At this time, for example, when pressing the two-layer winding coil 1, the movable stage 11a is moved upward and disposed near the upper end of the accommodation space 14, and the two-layer winding coil 1 is disposed on the upper surface of the movable stage 11a. Do. Then, the movable stage 11 a is moved downward to accommodate the two-layer wound coil 1 in the accommodation space 14, and the upper die 12 is moved downward to press the two-layer wound coil 1. When the pressing of the two-layer winding coil 1 is completed, the upper die 12 is moved upward, and then the movable stage 11 a is moved upward to retract the two-layer winding coil 1 from the accommodation space 14. Thereby, when pressing the two-layer winding coil 1, the two-layer winding coil 1 can be easily installed and removed.

  The present invention is not limited to the embodiments described above, and various modifications can be made as described below without departing from the scope of the present invention.

1 2 layer coil, 1a, 1b connection terminal, 1c central opening 2 square wire coil 3 innermost layer, 3a connecting wire portion 4 outermost layer, 4a connecting wire portion 5 middle layer 6a, 7a, 8a inner layer 6b, 7b, 8b Outer layer 10 Lamination thickness adjusting device 11 lower mold 11a movable stage 14 upper housing 12 upper mold 15 coil pressing surface 16 center projection 17 first convex portion 17a coil pressing surface 18 second convex portion 18a coil pressing surface, 19 inclined surface 13 mold

Claims (1)

The square wire coil is wound in two layers inside and outside so that the plan view is rectangular and the side view is trapezoidal, and the innermost layer and the outermost layer forming the layer displacement portion in the preset side portion, A method of pressing a top surface of a two-layer wound coil provided with an intermediate layer located between the innermost layer and the outermost layer with a die,
An inclined surface which inclines inward is formed on the coil pressing surface of the mold, and the inclined surface is brought into contact with a portion linearly extending from the coil end of the square wire coil to make the two-layer wound coil as well as pressing the,
The coil pressing surface of the mold is provided with a first convex portion for applying a load to the intermediate layer in the stacking direction, and when pressing the two-layer wound coil in the stacking direction by the mold, A pressing method of a two-layer wound coil, wherein the pressing pressure is locally increased in the intermediate layer by the first convex portion .