JPH0412776Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention relates to a terminal structure for a motor.
More specifically, it relates to the connection between the terminal of the stator winding of the motor and an external lead wire that is an external power supply intake part.

<<Prior Art>> Taking a small motor such as a low-power stepping motor as an example, although it varies depending on the type and structure, it is usually formed by winding a coil bobbin to form a coil, and this coil is connected to a stator and yoke. A stator is constructed by interposing the stator in between. Generally, as shown in Fig. 6, this coil is made of a synthetic resin coil bobbin 3 with flanges 2 integrally formed at both ends of a cylindrical coil winding core 1. A magnet wire 4 such as an enameled wire is wound many times. and,
In such a coil, since it is necessary to supply power to the magnet wire 4 to form an excitation field, the external circuit and the magnet wire 4 must be electrically connectable.

However, since the magnet wire 4 used in the annular coil for a small motor is extremely thin, it cannot be pulled out of the motor casing as it is.

Therefore, conventionally, a substantially rectangular terminal block 7 projecting in the radial direction is integrally formed on the outer circumference of the flange portion 2 of the coil bobbin 3, and a predetermined number of lead pins 8 are implanted on the upper surface of the terminal block 7. are doing. The end of the magnet wire 4 is connected to this lead pin 8 by soldering or the like, and is connected to an external power source (not shown) via this lead pin 8 to form an excitation field.

As this connection means, for example, there is a so-called power feeder direct connection method in which the end of the external lead wire 9 is wrapped and fixed around the lead pin 8 described above by wrapping or the like. In the case of this method, the insulating tube is covered or taped after fixing in order to prevent short circuits at the connecting portion.

<<Problems to be solved by the invention>> However, in the conventional motor terminal structure described above, it is difficult to align the lead pins 8 and the external lead wires 9, and the external leads are connected to the lead pins 8 one by one. The wire 9 must be attached, and the work is complicated. Furthermore, after installation,
There are problems in that it is very complicated to cover and insulate the insulating tube. Further, since only a relatively soft insulating tube or the like is placed around the outer periphery of the lead pin 8, there is a problem that a reinforcing member or the like must be separately attached to provide strength at that part. Especially for small motors that have become smaller and thinner in recent years,
The above problem is even worse.

On the other hand, in order to simplify the mounting work, a structure has been adopted in which a connector to which external lead wires are attached in advance is prepared separately, and the connector is attached to the lead pins 8. However, in such a structure, the mounting work is Although the structure is simplified, the structure becomes complicated, the number of parts increases, and the cost increases. Furthermore, if the connector is simply attached to the lead pins 8, there is a problem in that the connector is likely to separate from the lead pins 8. In addition, in order to solve this problem, it is necessary to separately provide a means to prevent detachment, which increases the complexity of the structure and
This exacerbates the problem of an increase in the number of parts.

This idea was created in view of the above-mentioned problems, and its purpose is to easily align the lead pin and external lead wire when joining them, even with a relatively simple structure, and to improve the joint location. An object of the present invention is to provide a terminal structure for a motor that can simplify insulation treatment.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the motor terminal structure according to the present invention has a coil bobbin main body having flanges at both ends of the coil winding core. In a motor terminal structure in which a lead pin is planted on one side and an external lead wire connected to an external power source is connected to the lead pin, a holder for attaching the external lead wire can be provided on the other flange facing the lead pin. The holder is arranged to be foldable, and a groove for attaching an external lead wire is bored on the surface of the holder facing the lead pin, and the lead pin is inserted into the groove when the holder is raised. .

<<Operation>> Attach the external lead wire into the groove of the holder. Next, the holder is stood up and the lead pin is inserted into the groove. As a result, the external lead wire and the lead pin come into contact with each other or come close to each other. In this state, they can be electrically connected by joining and fixing them by soldering or welding. Further, after joining, since the holder is positioned around the joint between the lead pin and the external lead wire, the joint can be insulated without performing a separate insulation treatment.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show a first embodiment of a motor terminal structure according to the present invention.

As shown in the figure, a synthetic resin coil bobbin 14 has substantially donut-shaped first and second flange parts 12 and 12' integrally formed on both ends of a cylindrical coil winding core part 10. It is constructed by winding a magnet wire 16 such as an enamelled wire with a small diameter of several millimeters many times. Further, a substantially rectangular terminal block 18 that projects in the radial direction is integrally formed on the outer circumference of the first flange portion 12 of the coil bobbin 14 . Three lead pins 20 are implanted at predetermined intervals on the upper surface of this terminal block 18, and magnet wires 16 are attached to these lead pins 20.
The end of the is attached.

In this respect, it is similar to the conventional one.

Here, in the present invention, first, the terminal block 1 of the second flange portion 12' where the terminal block 18 is not formed.
A holder 26 to which an external lead wire 24 can be attached is formed at a position opposite to the holder 8 so as to be freely foldable. The holder 26 includes a substantially rectangular main body 28 to which the external lead wire 24 is attached, and a flexible portion 30 integrally formed to hang down from the lower end of the main body 28 on the second flange 12' side.

On the side surface of the main body 28 facing the lead pin 20, there are three substantially concave vertical grooves 3 penetrating vertically.
2 is drilled. Projections 32a having a substantially triangular cross section are integrally formed on both inner surfaces of the vertical groove 32, respectively. That is, the apex 32b is located approximately at the center of the vertical groove 32 in the vertical direction;
First and second tapered surfaces 32c and 32d are formed which are inclined toward the front side and the back side from 2b. The distance between the two vertices 32b, 32b is slightly narrower than the outer diameter of the external lead wire 24 to be attached. Furthermore, each vertical groove 32 is formed at a position that substantially coincides with each lead pin 20 when the main body 28 is stood up, and the lower end surface of the main body 28 comes into contact with the upper surface of the terminal block 18. .

On the other hand, the flexible part 30 includes a vertical wall part 40 formed to hang down from the main body 28, and a relatively thick part formed to protrude from the lower end of the vertical wall part 40 toward the second flange part 12' side. It is formed into a substantially L-shape made of a thick base plate 42, and the end of the base plate 42 has a cutout groove 42a perforated in the same direction as the second flange portion 12'. As a result, the holder 26 can bend approximately 90 degrees around the thin wall portion 44 relative to the coil bobbin 14.

Furthermore, in this embodiment, the lower part of the vertical groove 32 is formed wide so that fixing work such as soldering or welding between the external lead wire 24 and the lead pin 20 can be easily performed. In addition, in this embodiment, in order to perform the fixing work by welding,
Since it is necessary to bring the welding probe into contact with the lead pin 20 and the external lead wire 24 from both sides, a window hole is formed in the inner surface of the wide part of the outer groove 32 of the main body 28 and penetrated therethrough.

Next, the operation of the above embodiment will be explained with reference to FIG. The external lead wire 24 from which the external lead wire 24 has been cut is press-fitted. Then, the external lead wire 24 is placed in a space defined by the apex 32 b of the vertical groove 32 and the second tapered surface 32 d, and the external lead wire 24 moves toward the front side of the apex 32 b and exits from the vertical groove 32 . Preventing separation (Figure 3a)
reference).

Next, the holder 26 with the external lead wire 24 attached thereto
is erected and the lead pin 20 is inserted into the vertical groove 32. At this time, the vertical groove 32 is placed in a predetermined position in advance.
Therefore, simply by standing up the holder 26, the vertical groove 32 and the lead pin 20 are automatically positioned. As a result, the coating layer 24a of the external lead wire 24 is peeled off and the core wire portion 2 is exposed.
4b contacts the lead pin 20 (see FIG. 3b).

In this state, the lead pin 20 and the core wire part 24
(b) by welding to ensure electrical connection. Furthermore, the lower surface of the main body 28 of the holder 26 and the upper surface of the terminal block 18, which are in contact with each other, are thermally welded and integrated by ultrasonic welding or the like.

Therefore, the lead pin 20 and the external lead wire 2
The connection point with 4 is surrounded by the main body 28 of the holder 26, and insulation can be achieved without using a separate member such as an insulating tube as in the conventional case.
Further, since the holder 26 and the terminal block 18 are also heat-welded and integrated, the strength can be improved.

In addition, normally, when using the coil bobbin 14 in a stepping motor, the coil bobbin 14 is
In such a case, the holders 26 provided on both coil bobbins 14 are arranged coaxially.
so that the opposing surfaces of the holder 26 are in surface contact with each other.
By ultrasonically welding the contact surfaces of the two, they may be integrated to further improve the strength. In this case, it is not necessary to weld the terminal block 18 and the holder 28 as described above.

Further, at this time, preferably, the lead pin 20 is arranged so as to be located relatively inside the vertical groove 32 when the holder 26 is raised, so that even if the two coil bobbins 14 are arranged close to each other,
The lead pins 20 provided on each can be insulated so that they do not come into contact with each other.

4 and 5 show a second embodiment of the present invention. In this embodiment, unlike the above-mentioned embodiment, a through hole 50 penetrating vertically is formed in the holder 26' instead of a substantially concave vertical groove, and the external lead wire 24 is inserted into the through hole 50. will be done. Further, the lower part of the through hole 50 is cut off on the side facing the lead pin 20, and the above-mentioned first
It has almost the same shape as the vertical groove 32 of the embodiment.

Further, in this embodiment, a linear engagement recess 52 is formed in the upper half of one side of the main body 26' (upper front side in FIG. 4), and an engagement claw piece 54 protrudes forward in the lower half. It is integrated like this. Further, on the other side of the main body 26', an engaging claw piece 54 is provided in the upper half, and an engaging recess is provided in the lower half.

The coil bobbin 14' having such a structure
Two terminal blocks 18 are prepared, and the first flange parts 12 provided with the terminal blocks 18 are arranged so as to face each other. Next, after attaching the external lead wire 24 to the holder 26' in the same manner as in the first embodiment described above (the fifth
The holder 26' is erected, and the external lead wire is connected to the lead pin 20 (solid line in FIG. 5B). Then, an engaging claw piece 44 provided on the holder 26'
are respectively engaged with the engagement recesses 42 provided in the other opposing holder 26', thereby integrating the two. In this case, both holders 26', 2
6' are connected to each other, the holders 26' and 2 are connected by ultrasonic welding or the like, as in the first embodiment described above.
There is no need to heat weld the 6' together, which simplifies the work.

Further, contrary to the second embodiment, two coil bobbins may be arranged so that the second flanges are close to each other. In that case, it is necessary to shift the position of the holder to the left and right so that the holder can fall down.

In the above-mentioned embodiment, the shape of the vertical groove provided in the holder is such that the vertical center line protrudes, but the present invention is not limited to this. The inner side of the groove 32b can be formed into various shapes, such as a concave groove without providing the second tapered surface 32d (only the front side has a tapered surface that tapers inward).

Moreover, the application of the motor terminal structure of the present invention is not limited to the above-mentioned stepping motor, but can be used for a wide variety of electric motors.

<<Effects of the invention>> As described above, according to the motor terminal structure according to the present invention, even in extremely simple tasks such as standing up a holder with external lead wires attached, the external lead wires can be accurately aligned with the lead pins. position to,
Can be contacted and joined.

Furthermore, since the holder itself also serves as an insulator at the joint between the lead pin and external lead wire,
There is no need to perform separate insulation treatment after bonding.

Furthermore, its structure is simple and the number of parts is small.
Cost reduction can be achieved.

[Brief explanation of drawings]

Figure 1 shows the first terminal structure for a motor according to the present invention.
A perspective view showing the embodiment, FIG. 2 is an enlarged perspective view of the main part,
Fig. 3 is a side view explaining the operation, Fig. 4 is an enlarged perspective view of the main part showing the second embodiment of the present invention, Fig. 5 is a side view showing the effect, and Fig. 6 is a perspective view showing the conventional example. It is a diagram. DESCRIPTION OF SYMBOLS 10... Coil winding core part, 12... First flange part, 12'... Second flange part, 14... Coil bobbin, 20... Lead pin, 24... External lead wire, 26... Holder, 32 ...Vertical groove.

Claims (1)

[Scope of utility model registration request] A motor terminal structure in which a lead pin is implanted radially outward in one flange part of a coil bobbin body having flange parts at both ends of a coil winding core part, and an external lead wire connected to an external power source is connected to the lead pin. , a holder for attaching the external lead wire is foldably disposed on the other flange portion facing the lead pin, and a groove for attaching the external lead wire is bored in a surface of the holder facing the lead pin. ,
A motor terminal structure characterized in that the lead pin is inserted into the groove when the holder is erected.