JP2000166189A - Manufacture of yoke for linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a yoke by which a yoke having a curvature on a layered surface can be assembled easily. SOLUTION: The manufacturing method of a yoke for a linear motor is such that layer plates 41 are connected to each other with connection parts 42 to form a layer forming plate 43 which is folded over the connection parts 42 to form a layered unit. The layered surface of the layered unit is curved by a curvature forming means so as to have a curvature in a layering direction. with this constitution, the respective thin plates are connected to each other in the layered unit and the shape can be changed after the layered unit is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a yoke member for a linear motor.

[0002]

2. Description of the Related Art A conventional yoke member is formed by laminating a plurality of rectangular thin plates having high magnetic permeability, and has a shape such that the lamination surface of the yoke member has a curvature. When the inner yoke and the outer yoke of the linear motor are formed using this yoke member, the direction of the magnetic flux of the linear motor and the direction of the thin plate overlap, and the magnetic flux of the linear motor can flow smoothly through the yoke member. In addition, iron loss due to eddy current can be minimized.

A conventional method of manufacturing a yoke member is to form a yoke member molding case with a lower surface as a curved surface portion, arrange thin plates on the curved surface portion, form a yoke member shape, and then weld the end of the yoke member with a laser. Thus, a yoke member is formed. According to such a manufacturing method, a yoke member having a curvature on the lamination surface can be obtained.

[0004]

However, when a yoke member having a curvature on the lamination surface is to be formed, a thin plate is arranged in a yoke member molding case having a curvature, so that the yoke member of a general electric motor performing a rotary motion. Molding was more difficult than the production of

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a method of manufacturing a yoke member in which a yoke member having a curvature on a lamination surface can be easily assembled.

[0006]

According to the method of manufacturing a yoke member for a linear motor of the present invention, a laminate formed plate in which a number of thin plates having high magnetic permeability are joined by a connecting portion is bent at the connecting portion to form a laminate. Since the laminated surface of the laminated body is formed to have a curvature in the laminating direction by the curvature forming means, each thin plate is connected to the laminated body, and the shape can be changed after the laminated body is formed. It is.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A method of manufacturing a yoke member for a linear motor according to the present invention is characterized in that a laminate formed plate in which a number of thin plates having high magnetic permeability are joined by a joint is bent at the joint to form a laminate. Since the laminated surface of the laminate is formed to have a curvature in the laminating direction by the curvature forming means, each thin plate is connected to the laminate, and the shape can be changed after the laminate is formed. .

Further, since the curvature forming means forms a curved surface by pressing a stamping portion on the laminated surface, the pressed surface can be formed by a simple method.

Further, after the laminated surface of the laminate is curved, the laminate can be held in a curved shape by welding.

[0010] Further, the laminate molded plate is composed of a laminate A and a laminate B
The laminates of the same type are connected only partially, and the others are alternately connected with the laminate A and the laminate B. Since the width of the laminate A is larger than the width of the laminate B, When folded, it becomes V-shaped.

[0011]

(Embodiment 1) A moving coil type linear motor according to an embodiment of the present invention includes an outer yoke 10, an inner yoke 20, an outer yoke 10, and an inner yoke 20 as shown in FIGS. And a cylindrical vibrating part 30 having a permanent magnet 30 between them. When an alternating current is supplied to the coil provided in the inner yoke 20, the permanent magnet 30
Generates a thrust proportional to the magnitude of the current and the magnetic flux density of the permanent magnet 30, and the vibrating portion reciprocates in synchronization with the frequency of the alternating current.

The outer yoke 10 has a cylindrical shape with a block member 12 interposed between a plurality of outer yoke members 11, and has a convex portion 13 provided at the head and bottom of the outer yoke member 11, and a circular ring. It is made by combining with the concave portion of the end portion 14.

The inner yoke 20 is formed by welding the inner yoke member 21 to the outer periphery of a cylindrical cylinder portion 22 and fixing a block member 23 between the inner yoke members 21.
And a coil 25 is wound around the inner yoke member 21 and the slot portion 24 of the block member 23. The coil 24 is wound around the inner yoke 20 and the block member 23 in the circumferential direction. The vibrating portion is inserted between the outer yoke 10 and the inner yoke 20 to obtain a movable magnet type linear motor.

Next, a method of manufacturing the yoke member 10 which is a feature of the present invention will be described. By pressing the iron plate,
As shown in FIG. 4, a continuous laminate 43 obtained by connecting rectangular laminates having a high magnetic permeability and a thickness of 0.23 mm by connecting portions 42 in the width direction of the laminate 41 is obtained. The laminate continuous body 43 includes protrusions 44 on the upper side and the bottom side of each laminate 41, and a connecting portion 42 that connects adjacent laminates 41 at an end of a side of the laminate 41.

The continuous laminate 43 is connected to the connecting portion 42.
And a laminate 45 is obtained by laminating the laminates 41. The laminated body 45 obtained in this way has an integrated structure without welding the laminated surface of the laminated body 45 because the laminated plates 41 are connected by the connecting portions 42 even when the laminated body 45 has the shape of the laminated body. Even when a force is applied from the outside of the laminate 45, the laminate 41 does not fall apart.

The laminate 45 obtained in the above folding step
Has a configuration in which the laminated plates 41 are stacked, but the laminated surface is flat and has no curved surface. A curved surface is formed on the laminated surface by a curvature molding process described below.

In the curvature forming step, the laminated body 45 is arranged in an arc-shaped concave portion of the laminated body support case, and the laminated surface 46 of the laminated body 45 is pressed by a pressing portion having a circular convex shape. In this manner, an arc shape is formed on the stacking surface 46 of the stack 45. In the laminated body 45 of the present application, since the laminated plates 41 are connected to each other by the connecting portion, even if the laminated body is deformed by pressing, the laminated plates do not fall apart.
Then, the outer yoke member 10 having the curvature in the laminating direction is obtained by welding the upper end of the laminated body having the curved surface in the laminating direction.

According to such a manufacturing method, an outer yoke member having a curved laminated surface can be easily obtained.

Although the method of manufacturing the outer yoke member has been described above, the inner yoke member having the laminated surface curved can be easily manufactured in the same manner.

FIG. 6 shows a continuous laminate 53 for an inner yoke member. The laminated plate 51 in which the slot concave portions 54 are provided at two places is symmetrical so that the slot concave portions 54 face each other, and becomes a laminated plate connected body 53 in which the laminated bodies 51 are connected by the connecting portions 52. By folding such a continuous laminate 53 at the connecting portion 53 to form a laminate 55, a laminate 55 having a slot portion is obtained. However, since the laminated surface of the laminate 55 is flat, the inner yoke member 20 is obtained by forming the laminated surface into a curved surface having a curvature in the laminating direction by the curvature forming step.

In the above-mentioned continuous laminate, each laminated plate is connected by two connecting portions, and slits (voids) are formed between the other laminated plates. However, as shown in FIG. May be connected to each other by slits (voids) on the dotted line or adjacent streaks 61 as shown in FIG. 8B.

Embodiment 2 Another manufacturing method of the yoke member will be described below.

As shown in FIG. 9, a laminate 71 having a width of W1 is provided.
Then, the laminate 72 having a width of W2 is connected to the connecting portion 73 to obtain a laminate continuous body 74. At this time, the laminate 71 and the laminate 72
Is W1> W2, the laminates 71 and 72 are connected alternately from the point A to the point B, and the laminates having the same width are connected side by side at the point B which is an intermediate point. From the point to the point C, the laminates 71 and 72 are connected alternately. The laminate continuous body 7 in which the width of the laminate is changed as described above
In the case of No. 4, since the width of the laminated plate 71 and the width of the laminated plate 72 are different when bent at the connecting portion, the laminated body is formed with a slope as shown in FIG.

At the point B, the laminated continuum 74 of this embodiment
Since the adjacent laminates have the same width, the inclination of the laminate at point B is in the opposite direction. Therefore, when the continuous laminated body 74 is completely folded, a V-shaped outer yoke member 80 as shown in FIG. 11 is obtained.

The outer yoke member 81 is obtained by forming the laminated surface of the outer yoke member 80 into a curved surface by a curvature molding process. Outer yoke member 8 of the present embodiment
Since 0 becomes a V-shape simply by forming a laminate by a folding process, a curved surface is easily formed by a curvature molding process.

The method of forming a V-shape in the folding step and forming a curved surface by the curvature forming step as described above can be used not only for the outer yoke member but also for the manufacture of the inner yoke member.

[0027]

In the manufacturing method according to the first, second and third aspects of the present invention, since the thin plates are connected by the connecting portion in the state of the laminated body, even if the laminated body is deformed by the curvature molding means, the shape is changed. The lamination surface can be easily made a curved surface without the thin plates being scattered.

In the manufacturing method according to the fourth aspect of the present invention, since the laminate is folded and formed into a V-shape, the laminated surface is easily formed into a curved surface by the curvature molding means.

[Brief description of the drawings]

FIG. 1A shows a linear motor according to a first embodiment of the present invention; FIG.

FIG. 2 is a sectional view of the outer yoke.

FIG. 3 is a sectional view of the inner yoke.

FIG. 4 is a view showing a continuous laminate of the outer yoke;

FIG. 5 (a) is a diagram showing an outer yoke member having the same lamination surface as a plane; FIG. 5 (b) is a diagram showing an outer yoke member having the same lamination surface being a curved surface;

FIG. 6 is a view showing the continuous body of a laminated plate for the inner yoke.

FIG. 7 is a diagram showing an inner yoke member in which the lamination surface is a curved surface;

FIG. 8 (a) is a diagram showing the other slit portion, and (b) is a diagram showing the same streak portion.

FIG. 9 is a diagram showing a laminated continuum of Example 2;

FIG. 10 is a partially enlarged view of the laminate.

FIG. 11 is a view showing the outer yoke member.

12A is a cross-sectional view of the V-shaped outer yoke member. FIG. 12B is a cross-sectional view of the outer yoke member after the same curvature forming step.

[Explanation of symbols]

 41 Laminated plate 42 Connecting part 43 Laminated continuum

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Claims (4)

[Claims] 1. A laminate formed plate in which a number of thin plates having high magnetic permeability are joined by a connecting portion is bent at the connecting portion to form a laminate, and the lamination surface of the laminate is curved in a stacking direction by a curvature forming means. A method for manufacturing a yoke member for a linear motor having a curved surface to have. 2. The method for manufacturing a yoke member for a linear motor according to claim 1, wherein the curvature forming means forms a curved surface by pressing a stamping portion on the laminated surface. 3. The method of manufacturing a yoke member for a linear motor according to claim 1, wherein the laminated body is fixed by welding the laminated body after the laminated surface of the laminated body is curved. 4. The laminated molded plate comprises a laminated plate A and a laminated plate B, and the laminated plates of the same type are connected adjacent to each other only partially, and the laminated plate A and the laminated plate B are alternately arranged in other portions. The width of the laminate A is larger than the width of the laminate B.
A manufacturing method of the yoke member for a linear motor according to the above.