JPH0617205U - coil - Google Patents

Abstract

(57) [Summary] [Purpose] Even when an extremely thin conductor film is used, handling of the winding end of the coil is facilitated. In a coil obtained by cutting a wound body 10 of a rod-shaped conductive thin film obtained by winding and solidifying a conductive thin film 2 on which an electrically insulating coating 11 is formed, a coil at the end of the winding end of the wound body 10 is formed. A reinforcing material 5 having rigidity higher than that of the thin film 2 forming the coil is adhered over almost the entire width, or a flexible thin plate-shaped conductive member 6 is adhered to the reinforcing material 5.
The thin film 2 of the portion lined with or the thin plate-shaped conductive member 6 is separated from the thin film 2 of the inner layer, and the wound body 10 is sliced to obtain the coil 1a, and at the same time, the thin film of the portion lined with the reinforcing material 5. 2 or the thin plate-shaped conductive member 6 is obtained as a terminal separated from the coil 1a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil (slice coil) obtained by slicing a wound conductive thin film. More specifically, the present invention relates to improvement of a terminal structure used for connecting a slice coil used in a motor such as a PM type stepping motor to an external drive circuit.

[0002]

[Prior art]

 Conventionally, instead of a general wire coil as a coil of a motor such as a PM type stepping motor, a tubular coil wound with a ribbon wire made of copper foil is adopted to improve the space factor of the coil conductor. It is considered to be miniaturized. Usually, in the case of a ribbon coil of this type, it is obtained by applying an adhesive to a copper foil of 30 μm to 50 μm on which an electrically insulating coating is formed, winding the same, forming a tubular body, and slicing it into a desired width. Therefore, even if the winding end portion of the coil is not adhered to the thin film of the inner layer, it has some rigidity as long as it has a thickness of about 30 μm to 50 μm, and therefore it keeps its shape without tearing and is not easy to handle. There is no freedom. Then, as shown in FIG. 4, the coil 101 is connected with a wire 104 to a terminal 103 provided on the motor casing 102 and is connected to an external drive circuit or the like via the terminal 103. On the other hand, further downsizing of the motor is required. For this reason, it is necessary to obtain the necessary magnetomotive force, that is, to reduce the number of turns even if the coil volume is reduced, and it is considered to reduce the thickness of the copper foil as much as possible. Then, in recent years, it has become possible to make the thickness of the copper foil several μm, for example, about 5 μm.

[0003]

[Problems to be solved by the device]

 However, in the case of this slice coil, if the wall thickness is too thin, it is difficult to handle the winding end portion of the coil. That is, if the thin film is adhered to the end, there is a risk of tearing when the end portion of the winding end is peeled off for connection to an external circuit or the like later. On the other hand, if the end of the winding is not adhered, strength will not be obtained due to the ultra-thin thickness of about 5 μm, and it will break during slicing and will be inconvenient to handle during connection work. Therefore, it is difficult to downsize the motor by thinning the ribbon wire (about 1/6 to 1/10 of the conventional product).

An object of the present invention is to provide a coil whose winding end portion is easily handled even when an extremely thin conductor film is used.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the coil of the present invention is a coil obtained by winding a conductive thin film having an electric insulation coating and solidifying the conductive thin film, and then winding the solid into a ring. A reinforcing material that is stiffer than the thin film that constitutes the coil is adhered over almost the entire width of the winding end part of the coil, and the thin film of the part lined with this reinforcing material is peeled from the thin film of the inner layer. . Here, it is preferable to use, for example, a synthetic resin or an electrically insulating film as the reinforcing material.

Further, the present invention is a coil obtained by winding a conductive thin film on which an electrically insulating coating is formed and hardening the conductive thin film into a rod-shaped conductive thin film. A flexible thin plate-shaped conductive member is adhered over almost the entire width of the end portion, and this thin plate-shaped conductive member portion is peeled off from the thin film of the inner layer. Here, as the conductive member, it is preferable to use, for example, an insulating film to which a conductive foil is attached.

[0007]

[Action]

 Therefore, when a coil is obtained by slicing a wound body, the thin film at the end of winding of each coil or the thin plate-shaped conductive member peels off from the thin film of the inner layer, and the terminal that connects the coil and the external drive circuit, etc. Function as. The thin film of the part that constitutes the coil is extremely thin, but since it is hardened with an adhesive, it maintains sufficient strength as a coil body. Also, since the winding end portion of the coil is lined with a reinforcing material, it has much higher rigidity than the case where only a thin film is used. Further, when a thin plate-shaped conductive member is provided at the end of winding, the thin plate-shaped conductive member itself has sufficient rigidity, and thus is directly drawn out of the motor casing.

[0008]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail based on the embodiments shown in the drawings. The present embodiment is applied to a coil in which two slice coil bodies whose winding directions are opposite to each other are arranged and connected at the innermost layer portion so as to function as one coil.

First, the structure of one coil body and its manufacturing method will be described.

The coil body is obtained, for example, by slicing a rod-shaped winding body obtained by winding a conductive thin film (hereinafter abbreviated as a rod-shaped winding body) into a desired width. As shown in FIGS. 1 (A) to 1 (D), the rod-shaped wound body is coated with an adhesive 12 while applying a conductive thin film 2 such as a copper foil having an electrically insulating coating 11 formed on at least one surface thereof. It is formed by winding it around a winding jig. In this embodiment, the electrically conductive thin film 2 is wound by using the electrically insulating bobbin 3 as a winding core when the electrically conductive thin film 2 is wound, and the rod-shaped winding body 10 is formed and then the insulating bobbin is formed. Slice every 3 to obtain coil bodies 1a and 1b. Here, the bobbin 3 is a tubular body formed of an electrically insulating material, for example, a resin such as polybutylene terephthalate or Duracon, and has a groove 4 provided on its outer peripheral surface parallel to the axis. The electrically insulating coating 11 is not formed on the portion of the conductive thin film 2 that contacts the bobbin 3, especially on the portion located in the groove 4. Note that the reinforcing material 5 as shown in FIG. 1 (A) or the flexible thin plate-like conductive member 6 as shown in FIG. 1 (B) is electrically conductive in almost the entire width of the thin film 2 at the end of winding. It is directly fixed with an adhesive or glue.

After the winding is completed, the adhesive 12 is cured to solidify the wound body 10 (see (C) in FIG. 2). At this time, the reinforcing member 5 or the flexible thin plate-shaped conductive member 6 is not completely adhered to the inner thin film 2, but is adhered in a completely peeled state or a easily peelable state.

After that, the wound body 10 is cut into a plurality of coil bodies 1a and 1b with a predetermined width, for example, by a multi-wire saw 13 or the like (see (D) of FIG. 2). The multi-wire saw 13 is formed by arranging tens to hundreds and tens of wires at a desired pitch as needed. In the sliced coil bodies 1a and 1b, the thin film 2 is torn or melted at the cut end portion by the wire saw 13 to cause an interlayer short circuit. Burrs, etc. of 7, 7 called the side of the body are removed. This prevents a short circuit between the electrically insulating coating 11 and the copper foil 2 electrically isolated by the adhesive 12. In order to prevent a short circuit between the side surfaces 7 of the coil bodies 1a and 1b after the etching process and the side surfaces of the other coil bodies, as shown in FIG. An epoxy-based or phenol-based resin coating 8 is formed. In the case of this embodiment, since the thin film 2 in the innermost layer is held by the electrically insulating bobbin 3, it is possible to prevent the thin film 2 from being rolled or broken during slicing. In addition, since the reinforcing material 5 or the flexible thin plate-shaped conductive member 6 is pre-bonded to the winding end portion of the thin film 2 with an adhesive or solder, the winding end portion of this winding end portion is wound. Even if the thin film 2 portion is not adhered to the inner thin film 2, the thin film 2 can be prevented from rolling or breaking during slicing. Although not shown, core removal becomes easy even if a core jig is used together.

The reinforcing material 5 provided at the winding end of the thin film 2 may not necessarily have conductivity, and may be an adhesive synthetic resin film such as cellophane tape (trade name) or an insulating material. It is possible to use a synthetic resin layer formed by directly applying a film or a synthetic resin to the back surface side of the thin film 2, and affixing it to the back surface side of the thin film 2 to enhance the strength of the thin film 2. Further, as the flexible thin plate-shaped conductive member 6, for example, an FPC (flexible circuit board) on which strip-shaped wiring is formed, or a conductive metal foil laminated on an insulating film is used. It is possible and is electrically and mechanically bonded to the thin film 2 with a conductive adhesive or solder. For example, it is preferable to use a polyimide film to which a copper foil is attached. In this case, if the copper foil is attached to the entire surface of the polyimide film, the coil may be sliced from any position at any position.

In the coil bodies 1a and 1b thus obtained, the electrically insulating bobbin 3 is mounted inside in advance. Therefore, as shown in FIG. 2A, the two coil bodies 1a and 1b are butted back to back and the grooves 4 and 4 of the bobbins 3 and 3 are arranged so that the winding directions of the coils are opposite to each other. Alignment is performed, and one piece of solder foil or solder rod, which is the electrical connecting means 9, is inserted into the grooves 4 and 4. Then, the two coil bodies 1a and 1b are heated to a predetermined temperature in a reflow furnace or the like and bonded to each other in this butted state to electrically connect the thin films 2 and 2 in the innermost layer. As a result, since the coils whose winding directions are opposite to each other are connected in the innermost layer, the two coil bodies 1a and 1b are connected in series, and the current flows in the same direction but the winding directions are opposite to each other. It becomes a coil. Therefore, it is possible to obtain an effect (magnetomotive force) as if the two coil bodies 1a and 1b were integrated into a large diameter. Since the electrically insulating bobbin 3 is mounted on the inner peripheral surfaces of the two coil bodies 1a and 1b, it is possible to prevent contact with the rotor magnet without forming the electrically insulating coating on the inner side. . Of course, when the bobbin 3 is not used, it is necessary to form an electrically insulating resin such as epoxy resin or phenol resin. Further, the thin film 2 in the outermost layer of the coil bodies 1a and 1b is provided with rigidity to the thin film 2 in the winding end portion by the lining of the reinforcing material 5, or the flexible thin plate-like conductive portion 6 is provided. The connection to allows direct connection to the external drive circuit.

The coil 1 configured as described above is used as a coil of a motor, for example, a PM type stepping motor, as shown in FIG. 3, for example. At this time, the coil 1 is arranged around the rotor 20, and the flexible thin plate-shaped conductive member 6 (or the thin film portion 5 reinforced with a reinforcing member) at the outermost layer thereof is outside the motor casing 21. It is directly connected to an external drive circuit etc. using this part. Therefore, it is not necessary to provide the terminals which are required for the conventional PM type stepping motor.

It should be noted that the above-mentioned embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the case where two coil bodies 1a and 1b are connected has been mainly described, but the present invention is not particularly limited to this, and any one slice coil such as a thin coil of a conventional face-to-face motor can be used. It can also be applied to the case where it is used as.

Further, although the coil body has a perfect circular shape in the present embodiment, the present invention is not particularly limited to this, and the coil body can be applied to a substantially triangular coil used in a face-to-face type motor or the like.

[0018]

[Effect of device]

 As is apparent from the above description, the present invention is a coil formed by rolling a rod-shaped conductive thin film winding body obtained by winding and solidifying a conductive thin film formed with an electrically insulating coating. A reinforcing material that is more rigid than the thin film that makes up the coil is bonded over almost the entire width of the winding end part of the coil, or a flexible thin plate-shaped conductive member is bonded, and the thin film or thin plate of this reinforcing material is lined. Since the conductive member part is peeled from the inner layer thin film, when the wound body is sliced to obtain a coil, at the same time the thin film or thin plate conductive member in the part lined with the reinforcing material was peeled from the coil. Obtained as a terminal. Therefore, it is not necessary to separately solder or adhere a terminal plate or the like to each coil after manufacturing the coil. Moreover, since the lead can be taken out of the motor directly from the coil, it is not necessary to provide a terminal separately from the coil.

Further, since the winding end of the conductive thin film is reinforced by the reinforcing material or the thin plate-shaped conductive member, there is no possibility of breaking or slicing the coil when slicing the coil. The coil can be formed by using an extremely thin copper foil having a thickness of 3 μm to 5 μm, and the coil conductor space factor can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a coil body of the present invention.

FIG. 2 is a view showing an embodiment of the coil of the present invention, (A)
Is a perspective view showing a pair of coil bodies before connection, and FIG. 6B is an enlarged cross-sectional view showing a part of the connected coils.

FIG. 3 is a cross-sectional view of a PM type stepping motor using the coil of the present invention.

FIG. 4 is a sectional view of a conventional PM type stepping motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 coil 1a one coil body 1b other coil body 2 thin film (ribbon wire) constituting the coil body 5 reinforcing material 6 thin plate conductive member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Wakai 1020 Kiga, Iida City, Nagano Sankyo Seiki Co., Ltd. Iida Factory

Claims (5)

[Scope of utility model registration request] 1. A coil obtained by winding a conductive thin film having an electrically insulating coating formed thereon and hardening the rod to form a rod-shaped conductive thin film wound into a ring, and substantially the entire width of a winding end portion of the wound body. A coil characterized in that a reinforcing material that is more rigid than the thin film that constitutes the coil is adhered, and the thin film in the portion where this reinforcing material is lined is separated from the thin film in the inner layer. 2. The coil according to claim 1, wherein the reinforcing material is a synthetic resin. 3. The coil according to claim 1, wherein the reinforcing material is an electrically insulating film. 4. A coil, which is obtained by winding a conductive thin film having an electrically insulating coating and hardening the conductive thin film, and winding the rod-shaped conductive thin film into a ring-shaped coil. A coil characterized in that a flexible thin plate-shaped conductive member is adhered over the entire width and the thin plate-shaped conductive member portion is peeled from the thin film of the inner layer. 5. The coil according to claim 4, wherein the thin plate-shaped conductive member is formed by attaching a conductive foil to an electrically insulating film.