JPH0646202Y2 - Small motor terminal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a terminal structure of a small motor such as a claw pole permanent magnet type stepping motor.

<< Prior Art >> In the case of a general claw pole permanent magnet type stepping motor, two bobbins wound with a coil are coaxially arranged at a predetermined interval on a stator yoke, and the coil and a lead wire for external wiring are provided. Some terminal structure is attached to connect to. In the case of a very small motor, the space for attaching the terminal structure is also very small, making it easy to connect the lead wires and realizing a terminal structure in which the connected lead wires are firmly fixed with a simple configuration at low cost. It's quite difficult.

Therefore, the present inventors previously developed the terminal structure disclosed in Japanese Utility Model Publication No. 1-16167. In this terminal structure, a terminal block is integrally provided on one flange of a plastic coil bobbin, the coil wound around the bobbin is connected to the terminal pin implanted in the terminal block, and the lead wire for external wiring is connected to this terminal. In addition to the structure of soldering to the pin, a lead wire holder is provided on the other flange of the coil bobbin, and the lead wire is press-fitted into a groove formed in the holder.

<Problems to be Solved by the Invention> In the above-described conventional technique, the lead wire for external wiring connected to the terminal pin is press-fitted and held in the groove of the holder. The holding strength is not so great only by press-fitting inside, and when the lead wire is pulled to some extent, the soldered portion of the lead wire and the terminal pin may come off, or the terminal pin may come off from the terminal block.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to easily connect and fix a lead wire for external wiring, and to fix the connected lead wire to an extremely large strength. It is to realize a simple terminal structure with a small number of points.

<< Means for Solving the Problems >> Therefore, in the present invention, in a small motor in which two coil bobbins are arranged in a stator yoke, a terminal block is formed on one flange and a flange is formed on the other flange of a bobbin with both-end flanges made of plastic. The lead wire clamp portion is formed via the hinge portion. The coil wound around the bobbin is connected to the terminal pin implanted in the terminal block,
The lead wire for external wiring is connected to this terminal pin. The two bobbins are attached to the stator yoke with the flanges on the side having the terminal blocks facing each other, and in that state, the two lead wire clamp portions located outside are combined with each other to connect the lead wires to each other. The structure will be sandwiched between the clamps. A groove into which the lead wire is press-fitted and a protruding piece for pressing the lead wire into the groove are formed in the lead wire clamp portion, and when the two clamp portions are combined with each other, one clamp portion The convex piece of the other clamp portion is fitted in the groove.

<< Operation >> The lead wire is press-fitted into the groove of the lead wire clamp portion, and when the two clamp portions are further combined with each other, the convex piece of the other clamp portion fits into the groove, Are pressed and sandwiched by the convex pieces in the groove.

<< Embodiment >> FIG. 1 shows the overall structure of a claw pole permanent magnet type two-phase stepping motor adopting the terminal structure according to the present invention, and FIGS. 2 to 7 show the details of the terminal structure. .

In FIG. 1, the stator of this stepping motor is composed of an A-phase unit 1 and a B-phase unit 2 of almost the same structure, which are faced to each other and are coaxially connected to each other. A rotor shaft 21 is attached to the rotor shaft 22 and washers 22 and 23 are rotatably mounted. The A-phase unit 1 includes a coil 6a in a one-phase claw pole type yoke consisting of two parts, an outer yoke 3a and an inner yoke 4a.
The bobbin 5a wound with is stored. Similarly, the B-phase unit 2 is configured such that a bobbin 5b having a coil 6b wound therein is housed in a one-phase claw pole type yoke including an outer yoke 3b and an inner yoke 4b. And, for example, A-phase unit 1 and B
The phase units 2 are individually assembled, and then the A phase unit 1 and the B phase unit 2 are combined and integrated while accommodating the rotor therein.

Next, the terminal structure according to the present invention will be described in detail. Bobbin 5a
5 and 5b have the same configuration, and one of them will be described below. FIG. 2 shows one bobbin 5a. Bobbin 5a
Is a plastic molded part that integrally has a flange on each end of the cylindrical portion around which the coil 6a is wound.A terminal block 7a is integrally formed at a predetermined position on one flange, and a position facing the terminal block 7a on the other flange. A lead wire clamp portion 8a is integrally formed with the hinge portion 13 via a hinge portion 13.

Three terminal pins 10a are implanted in the terminal block 7a, and the three terminals of the bifilar wound coil 6a are connected to the three terminal pins 10a, respectively. Then, the lead wire 9a for external wiring is soldered to the tip end side of the terminal pin 10a.

FIG. 3 shows a detailed structure of the lead wire clamp portion 8a. The clamp portion 8a is formed with three parallel grooves 11 each having a wider inner portion for press-fitting the lead wire 9a, and a total of three convex pieces 12 are formed beside each groove. Bobbins 5a and 6b having the same configuration are arranged with the flange sides having the terminal blocks 7a and 7b facing each other, and lead wire clamp portions 8a having the same configuration,
The lead wire 8b can be erected about the hinge 13 as shown by the arrow Y in FIG. 2, and the two lead wire clamp portions 8a and 8b can be combined with each other as shown in FIG. In this combined state, the groove 11 and the convex piece 12 are engaged with each other, and the convex piece 12 of the other clamp portion is fitted into the groove 11 of the one clamp portion.

Therefore, after the lead wire 9a is soldered to the terminal pin 10a of the terminal block 7a in the bobbin 5a, the lead wire clamp portion 8a is erected around the hinge 13 and the lead wire 9a is press-fitted into the groove 11. In exactly the same manner, the lead wire 9b is soldered to the terminal pin 10b of the bobbin 5b, the lead wire clamp portion 8b is raised, and the lead wire 9b is press-fitted into the groove 11.

Then, as shown in FIG. 5, the two bobbins 5a and 5b are assembled with the inner yokes 4a and 4b sandwiched therebetween, with the terminal blocks 7a and 7b facing each other. Then, as shown in detail in FIG. 6 and FIG. 7, the convex piece 12 of the clamp portion 8a is aligned with the groove 11 of the clamp portion 8b.
Lead wire 9b that has been pressed into the groove 11
Will be clamped in the groove. At the same time, the convex piece 12 of the clamp portion 8b is fitted into the groove 11 of the clamp portion 8a, and the lead wire 9a is pressed in the groove. At this time, as shown in FIG. 7, the projecting piece 12 presses down on the plastic skin of the lead wire 9b, and the tip of the projecting piece 12 bites into the skin of the lead wire 9b, and the upper and lower corners of the projecting piece 12 are cut. The part acts like a wedge, and the lead wire
9b is firmly fixed in the groove 11. As a result, even if a considerable pulling force acts on the lead wire 9b, it can be held in a state of being clamped by the clamp portions 8a and 8b.

<Effect of Device> As described in detail above, in the terminal structure of the small motor according to the present invention, the coil wound on the bobbin is connected to the pin of the terminal block provided on one flange portion of the bobbin, and the external wiring is connected. A lead wire for soldering to this pin, and press-fit and hold the lead wire in the groove of the lead wire clamp portion provided on the other flange of the bobbin,
Further, two bobbins of the same structure are arranged next to each other, and by combining the clamps so that they face each other, the lead wires press-fitted in the groove are sandwiched between the projecting pieces and firmly fixed. As a result, the fixing force of the lead wire is very large, despite the simple configuration with few parts.
Highly reliable external wiring can be performed by simple work.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a claw pole permanent magnet type two-phase stepping motor adopting a terminal structure according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a terminal structure for one bobbin in the same embodiment. FIG. 3 is a perspective view showing details of the lead wire clamp portion in FIG. 2, FIG. 4 is a plan view showing a state in which two lead wire clamp portions of FIG. 3 are faced to each other, and FIG. FIG. 7 is a partial cross-sectional front view showing an example terminal structure, FIG. 6 is a plan view showing a state in which a lead wire is sandwiched between two lead wire clamp portions in the above embodiment, FIG.
The drawing is a sectional view taken along line ZZ in FIG. 1 …… A phase unit, 2 …… B phase unit 3a, 3b …… Outer yoke, 4a, 4b …… Inner yoke 5a, 5b …… Bobbin, 6a, 6b …… Coil 7a, 7b …… Terminal block 8a, 8b …… Lead wire clamp 9a, 9b …… Lead wire 10a, 10b …… Terminal pin 11 …… Groove, 12 …… Convex piece 13 …… Hinge, 20 …… Rotor magnet 21 …… Rotor shaft, 22,23 ...... Washers

Claims (1)

[Scope of utility model registration request] 1. A small motor in which two bobbins wound with a coil are coaxially arranged at a predetermined interval on a stator yoke; the bobbin is a plastic part having flanges integrally formed at both ends of a cylindrical portion. A terminal block is formed at a predetermined position of the flange of the above, and a lead wire clamp section is formed at a position of the other flange facing the terminal block via a hinge section; and the coil wound around the bobbin is It has a structure in which it is connected to a terminal pin implanted in the terminal block, and a lead wire for external wiring is connected to the terminal pin; the two bobbins have their flanges on the side having the terminal block facing each other. The leads connected to the terminal pins are mounted on the stator yoke, and in this state, the two lead wire clamp portions located outside are combined with each other and connected to the terminal pins. Be a structure sandwiching the line in both the clamping unit; the lead clamp portion has a groove in which the lead wire is press, the convex strip for hold down the lead wire in the groove, 2
A terminal structure for a small motor, characterized in that, when the two clamp parts are combined with each other, the convex piece of the other clamp part fits into the groove of the one clamp part.