JPS60134757A - Manufacture of core unit in linear pulse motor - Google Patents

Abstract

PURPOSE:To improve the yield in steps and to closely integrate core plates to remove a running noise by punching the core plates, then laminating and disposing in a mold, filling and solidifying a stationary material. CONSTITUTION:Thin plates of silicon steel are punched by a press to form core plates 10. At this time, holes 11a, 11b are simultaneously formed at the yoke portion 10a of the plate 10, and a recess 12a and a projection 12b are further formed by half-punching. The recesses 12a and the projections 12b of the plates 11 are engaged with each other to tightly couple the plates 10. Then, the laminated plates 10 are disposed in a mold, a stationary material is filled and solidified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear pulse motor used for moving the head of a printer or an X-Y plotter, and more particularly to a method of manufacturing a core unit constituting a mover.

As described above, a linear pulse motor is a motor that performs linear movement according to a pulse signal supplied to a coil of a moving element, and FIGS. 1 and 2 show a schematic configuration of a conventional linear pulse motor. In the figure, reference numeral 1 denotes a stator having comb-like irregularities formed on its upper surface, and a mover 3 having wheels 2, 2, . . . is placed on the upper surface of this stator 1. The mover 3 is provided with cores 5a and 5b, and the core 5a.

Permanent HB stones 5a and 5b are on the top of 5h, and core 5
Core holders 9.9 shown in FIG. 2 are attached to the sides of a and 5b, respectively. Here, the core 5a.

5b and core pressers 9, 9 constitute a core unit. Moreover, magnetic poles 7a to 7d formed in cores 5a and 5b
Each of the coils 8a to 8d is wound around the coils 8a to 8d.

By the way, the core unit in the mover 3 mentioned above is
A thin silicon steel plate is punched out to form a core plate, and after the core plates are laminated, a core presser 9, 9 made of a non-magnetic metal plate is formed.
clamp them together, and attach them together with rivets 4.
pJJj is constructed by caulking using a and 4b. However, this conventional manufacturing method in which caulking is performed using rivets has the problem of poor process yield. That is, in order to obtain a certain level of strength, the core presser 9 must be thick, and therefore the rivets 4a used for caulking must be long. However, as the length of the rivet increases, the ffl at which it buckles during riveting increases. And when the rivet buckles,
Unity of each caulked core board! i! 1i Darkness is insufficient, and the core becomes susceptible to the effects of magnetic vibration. Therefore, when a mover is constructed using this core, the running sound emitted by the mover while running increases, and it may be considered a defective product. Become.

In view of the above circumstances, the present invention has developed a method for manufacturing a core unit in a linear pulse motor that can be manufactured without using rivets and that can integrate each core plate more closely than conventional ones. A first step of punching out the outer shape of the core plate, forming four parts and convex parts at predetermined positions on the core plate, and forming holes at predetermined positions on the core plate in one press operation; , a second step of laminating the core plates created in the first step, and placing the core plates laminated in the second step in a mold, and placing a fixing material in the mold. The third step is to inject and solidify
It is characterized by consisting of the following steps.

Hereinafter, one embodiment of the manufacturing method according to the present invention will be explained with reference to FIGS. 3 to S.

First, a core plate 10 shown in FIG. 3(A) is created by pressing a thin silicon steel plate. Also,
At the same time, a hole 11a is formed in the meak portion 10a of the core plate 10.
, llb are formed, and a recessed portion 12a and a raised portion 12b shown in FIG. That is -
All of the above-mentioned processes are performed in the press process. Note that it is desirable that the holes 11a, 1it) be bored at positions that do not cast a shadow 9 on the magnetic flux passing through the core plate 10. Next, by checking the mold temperature of each core plate produced, it is determined whether there are any defective products or not, and then a predetermined number of non-defective products are laminated with their outer shapes matched, and the core 1 shown in FIG.
3.0 At this time, the concave portion 12a and the convex portion 1 of each core plate
2b are fitted into each other as shown in FIG. next,
The two cores 10 formed by the method described above are placed in a mold, and a core holder is made by aluminum die casting.

FIGS. S (a) and (b) each show the configuration of the core unit 14 created by the above method. 1 and a plan view, and in these figures, the core presser 15 includes a left side plate 16a, a right side plate 16b, and the above-mentioned core plate 1.
Horizontal bar 17°17 for IJ bending holes 11a and llb of 0.
・Consists of. According to this method, since the aluminum alloy contracts slightly when it cools, each core plate 10 is more tightly integrated.

Note that the core presser 15 may be formed using resin or the like instead of aluminum alloy. In this case, since the molding can be performed at a low temperature, the heat engraving that the core 13 receives can be reduced.

As explained above, according to the present invention, the punching of the outer core plate, the formation of concave portions and convex portions at predetermined positions on the core plate, and the formation of holes at predetermined positions on the core plate are all performed using a single press. A first step performed by operation, a second step of laminating the core plates created in the first step, and placing the core plates laminated in the second step in a mold, 011
A third step of injecting a fixing material into the mold and solidifying it;
Since it is equipped with, there is no need to rivet crimping,
Therefore, the yield in the process can be improved. In addition, since the core holder is integrally molded with the core, each core plate is more tightly integrated than before, making it less likely to be affected by carvings of vibration, and making it possible to reduce running noise.

[Brief explanation of the drawing]

Figures 1 and 2 are a partially cutaway front view and side view of a conventional IJ near-pulse motor configuration, respectively. Figure 3 (B) is a plan view of the core formed in the same example, and Figure 3 (A) is a front view showing the shape of the core plate shown in Figure 3 (A). The sectional view, Fig. 3 (b) is a sectional view showing the structure of the core shown in Fig. 3 (b), and Figs. It is a side view and a top view showing the composition of the created core unit 14. 10... core plate, lla... river hole, 11b...
...hole, 12a ... recess, 12b ...
...Protrusion, core unit for 14, 15...
...Core pressing. Figure 1 Figure 2

Claims (1)

[Scope of Claims] fa) A first method of punching out the outer shape of the core plate, forming four parts and convex parts at predetermined positions on the core plate, and forming holes at predetermined positions on the core plate in a single press operation. (bl) a third step of laminating the core plates created in the first step; fc) placing the core plates laminated in the second step in a mold, A method for manufacturing a core unit in a linear pulse motor, comprising: a third step of injecting and solidifying a fixing material into the core unit.