JP5979098B2 - Coil holding member for electrical equipment - Google Patents

Description

  The present invention relates to a holding member that holds a coil wound around a tooth in a predetermined position with respect to a tooth of a core of an electric device.

  In electrical equipment such as an electric motor and a generator, a holding member is known that is interposed between a core (iron core) and a coil wound around a core tooth and holds the coil in a predetermined position with respect to the tooth. . There is also known a so-called cassette coil type coil in which a coil is attached to a holding member having a shape corresponding to a tooth and is attached to the tooth in this state.

  Patent Document 1 below discloses a cassette coil type coil. The insulator (200) has side wall insulating portions (206, 216) and locking portions (203, 204), and a coil is provided so as to be wound around these. The locking part (203, 204) is provided with a claw part (207), which locks the end face of the coil (see paragraph 0048).

  Patent Document 2 below shows a locking claw (9) having a claw (9a) for fixing the undercover (50) to the magnetic pole (2). In order to prevent the claw from coming off from the magnetic pole, it is described that the back surface of the locking claw is supported by a rod-like body (20) (see paragraph 0012).

  In addition, the code | symbol enclosed with () is a code | symbol used by applicable literature, and is not related with the code | symbol used by this-application embodiment.

JP 2010-246269 A JP 2004-37160 A

  Since the locking portions (203, 204) of Patent Document 1 bend when receiving an external force, the position of the coil relative to the teeth is not fixed. Furthermore, when the coil end is buried and fixed with a filler, the claw portion of the locking portion may be detached from the coil due to the flow of the filler during filling. This also causes coil misalignment. In order to prevent the locking portion from being bent, when using a member that supports the back surface of the locking portion, such as the rod-like body (20) shown in Patent Document 2, an increase in the number of parts, Man-hours to install increase.

  An object of this invention is to provide the holding member of the simple structure which hold | maintains a coil in a predetermined position with respect to teeth.

  The coil holding member of the electrical equipment of the present invention is located on the inner side of the base plate that surrounds the base portion of the teeth and the two portions that become the coil ends when the coil is attached to the teeth, and the direction in which the teeth extend from the base plate Extending in the same direction as the locking piece on both sides of the locking piece, and extending the teeth and the coil at a predetermined interval. And a retaining piece extending ahead of at least one of the two retaining ribs.

  The holding rib provided corresponding to each of the coil ends on both sides holds the coil at a predetermined position in the direction connecting the coil ends on both sides. In addition, since the locking piece extends ahead of the holding rib, when filling the coil end with the filler, the filler is filled in the back of the leading end of the locking piece so that the locking piece does not come off the coil. Is done.

  The coil can be held at a predetermined position with respect to the teeth.

It is a disassembled perspective view of the holding member 10 of this invention, the coil 14 relevant to this, and the stator core 12. FIG. It is a perspective view which shows the state which attached the holding member to the coil. It is a figure which shows the state seen from the teeth front-end | tip of a stator core in the state which integrated the holding member, the coil, and the stator core. It is a figure which shows the cross section orthogonal to the teeth arrangement | positioning direction of the state which integrated the holding member, the coil, and the stator core. It is a figure which shows the state which filled the coil end in the filler. It is explanatory drawing in case the length of a locking piece and a holding rib is equivalent. It is a figure which shows the flow of a filler when the length of a locking piece and a holding rib is equivalent. It is a figure which shows the flow of a filler at the time of shortening a holding rib.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description will be made with respect to an electric motor as an electric device, in particular, a motor having the most common inner rotor configuration in which a rotor is disposed on the inner peripheral side and a stator is disposed on the outer peripheral side. However, application to other electrical devices is not excluded. For example, the present invention can be applied to an outer rotor motor in which a rotor is disposed on the outer peripheral side and a stator is disposed on the inner peripheral side, an axial motor in which the rotor and the stator face each other in the rotation axis direction, and a linear motor. Further, the present invention can also be applied to a generator or an electric device having both functions of a motor and a generator.

  1 to 4 are views showing a holding member 10 according to the present invention, and a stator core 12 and a coil 14 related to the holding member 10. FIG. 1 is an exploded perspective view showing the holding member 10, the stator core 12, and the coil 14 before assembly. FIG. 2 is a perspective view showing a state where the coil 14 is assembled to the holding member 10. FIG. 3 is a diagram illustrating a state in which the holding member 10, the stator core 12, and the coil 14 are assembled and viewed from the tip of the teeth 18 of the stator core 12. Further, FIG. 4 is a cross-sectional view of the state in which the holding member 10, the stator core 12, and the coil 14 are assembled.

  The stator core 12 has a substantially cylindrical shape. Specifically, the stator core 12 includes a cylindrical yoke 16 and a plurality of teeth 18 extending inwardly from the cylindrical inner peripheral surface of the yoke 16. The plurality of teeth 18 are arranged at predetermined intervals in the circumferential direction. In FIG. 1, only one tooth 18 and its surrounding yoke 16 are shown.

  The “direction” used in the following description is determined as follows based on the teeth 18. The direction in which the teeth 18 extend from the yoke 16 is the tooth axis direction (direction indicated by X in FIG. 1), the direction in which the plurality of teeth are arranged is the teeth arrangement direction (direction indicated by Y in FIG. 1), and the tooth axis line. A direction perpendicular to the direction and the teeth arrangement direction is referred to as a tooth crossing direction (direction indicated by Z in FIG. 1).

A space between adjacent teeth 18 is called a slot. A surface of the yoke 16 facing the slot is referred to as a slot bottom surface 20. Of the four side surfaces of the teeth 18, the side surface facing the teeth arrangement direction is referred to as the arrangement direction side surface 22, and the side surface facing the teeth transverse direction is referred to as the transverse direction side surface 24.

  The coil 14 is formed by winding a conducting wire (rectangular wire) having a rectangular cross section, and has a portion that fits in the slot and a portion that goes out of the slot and crosses between the slots (so-called coil end). The holding member 10 is inserted and mounted inside the coil 14 and integrated as shown in FIG. After being integrated, the coil 14 and the holding member 10 are attached to the teeth 18. When the coil 14 is attached to the tooth 18, the holding member 10 holds the coil 14 so that the position of the coil 14 with respect to the tooth 18 is a predetermined position. The holding member 10 is made of an insulating material, and is interposed between the coil 14 and the stator core 12 to insulate them. Therefore, the holding member 10 functions as an insulating member that insulates the coil 14 and the stator core 12.

  The holding member 10 includes a base plate 26 positioned at the base (base) of the tooth 18 and a cylindrical portion 28 that surrounds the periphery of the tooth 18 when attached to the tooth 18. The base plate 26 has a substantially rectangular outer shape, and a substantially rectangular opening through which the teeth 18 pass is provided at the center. The base plate 26 functions as an insulating member between the coil 14 and the yoke 16. The cylindrical portion 28 is connected to the edge of the opening of the base plate 26. The cylindrical portion 28 has a substantially rectangular cross-sectional shape, and has four side surfaces corresponding to the four side surfaces 22 and 24 of the tooth 18. Similarly to the side surfaces 22 and 24 of the teeth 18, the side surface facing the teeth arrangement direction is referred to as the arrangement direction side surface 30, and the side surface facing the transverse direction is referred to as the transverse direction side surface 32. When the holding member 10 is attached to the coil 14, the transverse side surface 32 of the cylindrical portion 28 is positioned inside the coil end. The cylinder portion 28 functions as an insulating member between the coil 14 and the teeth 18.

  A locking piece 34 and a holding rib 36 are provided outside the transverse side surface 32 of the cylindrical portion 28. The locking piece 34 is spaced from the transverse side surface 32 of the cylindrical portion 28 and extends from the base plate 26 in the direction of the tooth tip along the tooth axis direction. A locking claw 38 that engages with the coil 14 is provided at the tip of the locking piece 34. The holding rib 36 is provided on the side surface 32 in the transverse direction of the cylindrical portion 28, and is provided on both sides of the locking piece 34 so as to extend in the tooth axis direction. The end surface of the holding rib 36 in the teeth transverse direction is at a position where the distance from the transverse side surface 32 is the same as the portion other than the locking claw 38 of the locking piece 34. As shown in FIGS. 3 and 4, the locking piece 34 and the holding rib 36 are respectively provided on the transverse side surfaces 32 on both sides of the cylindrical portion 28. In FIG. 3, the end faces of the upper and lower holding ribs 36 are in contact with the inner circumference of the coil 14, whereby the position of the coil 14 in the teeth crossing direction is determined. In other words, the holding rib 36 defines the distance between the teeth and the coils on both sides of the teeth so that the coil 14 does not move in the teeth crossing direction. As will be described later, in the tooth axis direction, the length of the holding rib 36 is shorter than that of the coil 14 and is in contact with only a part of the coil 14 (see FIG. 4). However, the coil 14 is formed of a relatively thick conductive wire, and therefore the coil 14 is not substantially deformed in the process after being wound. Therefore, the position of the coil in the teeth crossing direction is determined by the holding ribs 36 coming into contact with a part of the inner circumference of the coil 14 above and below the teeth 18. As shown in FIG. 4, the locking claw 38 of the locking piece 34 is hooked on the end surface of the coil 14 on the distal end side of the tooth and clamps the coil 14 in the tooth axis direction in cooperation with the base plate 26. Thereby, the position of the coil in the tooth axis direction is determined. The position in the teeth arrangement direction is determined by the arrangement direction side surface 22 of the teeth 18 supporting the inner periphery of the coil 14 via the cylindrical portion 28.

  As shown in FIGS. 1 and 4, the length of the holding rib 36 is shorter than the length of the locking piece 34. In FIG. 4, the right ends of the holding rib 36 and the locking piece 34 are on the base plate 26, and both extend leftward from here. The holding rib 36 stops extending before reaching the left end of the coil 14 or until the middle. On the other hand, the locking piece 34 extends beyond the left end of the holding rib 36.

  After the coil 14 is mounted on the stator core 12, insert molding is performed with a filler so as to fill the coil end of the coil 14, and the gap between the conductive wires of the coil 14 and the space between the coil and the stator are filled. As the filler, an insulating resin can be used. FIG. 5 shows a coil end after insert molding and a cross section around the coil end. The coil end of the coil 14, the locking piece 34 of the holding member 10, etc. are buried in the filler 40.

  FIG. 6 shows a holding rib 42 longer than the above-described holding rib 36 as a comparison with the present embodiment. The two holding ribs 42 have substantially the same length as the locking piece 34. In this case, the locking piece 34 is located between the long holding ribs 42 over the entire length. In this state, when the filler material is poured, as shown in FIG. 7, the filler material is blocked by the long holding rib 42, and the filler material does not fall below the locking piece 34, and is sent above the locking piece 34. The filler pushes the locking piece 34 downward. As a result, as shown in FIG. 6, the locking piece 34 may bend and the locking claw 38 may be detached from the coil 14. When the locking claw 38 is released, the holding member 10 cannot hold the coil 14 in a predetermined position.

  As described above, the holding rib 36 of the holding member 10 is shorter than the locking piece 34, and the vicinity of the tip of the locking piece 34 protrudes from the end of the holding rib 36. Thereby, in the vicinity of the tip of the locking piece 34, as shown in FIG. 8, the filler rotates below the locking piece 34, and the locking piece 34 is pushed upward or pushed by the filling material rotated upward. The locking claw 38 is supported so that the locking claw 38 is not detached from the coil 14.

  The length of the two holding ribs provided on both sides of the locking piece 34 is set to be equal to the length of the locking piece 34 in the same manner as the long holding rib 42, and the other length from the locking piece 34 as in the holding rib 36. It can be shortened. Even in this case, the filler flows under the locking piece 34 from the shortened holding rib side, and the locking piece 34 is prevented from being bent. Moreover, only one holding rib can be used. The filler flows downward from the side where the holding rib is not provided, and the deflection of the locking piece 34 is suppressed.

  DESCRIPTION OF SYMBOLS 10 Holding member, 12 Stator core, 14 Coil, 16 Yoke, 18 Teeth, 26 Base plate, 28 Tube part, 32 Transverse side surface of cylinder part, 34 Locking piece, 36 Holding rib, 38 Locking claw.

Claims (1)

When filling the coil end of the coil of the electric device with a filler, a holding member for holding the coil in a predetermined position with respect to the teeth of the core of the electric device,
A base plate surrounding the base of the teeth;
When the coil is attached to the teeth, it is located inside the two parts that become the coil ends, and extends from the base plate along the direction in which the teeth extend. A locking piece having
A holding rib that extends in the same direction as the locking piece on both sides of the locking piece, and holds the teeth and the coil at a predetermined interval;
Have
The locking piece extends ahead of at least one of the two holding ribs,
Coil holding member for electrical equipment.

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