JPH11162732A - Electromagnetic solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic solenoid comprising an even stroke characteristics, by suppressing occurrence of dispersion in electromagnetic attractive force. SOLUTION: Related to an electromagnetic solenoid comprising a coil 12, a stator 14 of magnetic materially provided in the coil 12, a moving piece 15 of magnetic material movably provided in a guide hole 14a of the stator 14, and an elastic body 16 opposing a magnetic attractive force between the stator 14 and the moving piece 15, a part of the stator 14 or the moving piece 15 is saw-tooth shape in cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic solenoid used for a drive of a massage machine or a vibrator.

[0002]

2. Description of the Related Art FIG. 7 is a side sectional view of a conventional electromagnetic solenoid. As shown in FIG. 7, a conventional electromagnetic solenoid 1
Is a non-magnetic disk-shaped plate 10 and a yoke 11
, A coil 12 and a stator 1 fixed in the coil 12
4, a movable member 15 composed of an exciter which is disposed to face the stator 14 and guides an inner wall of a guide hole 14a provided in the stator 14, and fixes the movable member 15 against a load force. The movable member 15 includes a coil spring 16 corresponding to an elastic body that urges the armature 14, and a non-magnetic rod-shaped shaft 18 fixed to the tip of the mover 15.

[0003] The yoke 11 is a hollow, substantially cylindrical member formed of a magnetic metal such as silicon steel or electromagnetic soft iron, and is fixed to the plate 10 by appropriate means.

[0004] The coil 12 is formed by winding a soft copper wire whose surface is covered with an insulating layer around the outer periphery of a bobbin (not shown) made of synthetic resin. The coil 12 is housed in the yoke 11.

[0005] The stator 14 is made of a cylindrical magnetic metal, and is formed by cutting or the like into a shape having an outer diameter substantially equal to the inner diameter of the coil 12. Inside the stator 14, there is provided a guide hole 14a into which a movable element 15 described later is loosely fitted coaxially.

The mover 15 is provided with a guide hole 14 a of the stator 14.
Is made of a substantially cylindrical magnetic metal that can move with the inner wall as a guide, and has a ring-shaped flange 15a on the opposite side.

A non-magnetic rod-shaped shaft 18 is provided upright at the center of the end face of the mover 15 on the stator side.
0, a disk-shaped spring receiver 19 is fixed to the tip of the shaft 18.

The coil spring 16 is a coil spring made of stainless steel or the like, penetrated by the shaft 18, and interposed between the plate 10 and the spring receiver 19. The shaft 18 is formed of a non-magnetic metal material such as brass, and is fixed to the mover 15.

The electromagnetic solenoid 1 configured as described above
, The exciting current flows through the coil 12,
An electromagnetic attraction force acts on the mover 15 in a direction opposite to the load force F, and the mover 15 moves to a position where the electromagnetic attraction force and the spring force of the coil spring 16 are balanced.

[0010]

In the electromagnetic solenoid 1 having the above structure, the stroke shown in FIG. 8 is established between the stroke of the mover 15 and the electromagnetic attraction force. There is a problem that the magnitude of the suction force is large and non-uniform.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic solenoid which suppresses a variation in an electromagnetic attraction force and has a uniform stroke characteristic. It is in.

[0012]

According to the first aspect of the present invention,
A coil, a stator made of a magnetic material disposed in the coil, a mover made of a magnetic material movably disposed in a guide hole of the stator, and a magnetic attraction between the stator and the mover An electromagnetic solenoid provided with an elastic body that opposes the above, characterized in that a cross-sectional shape of a part of the stator or the mover has a saw-tooth shape.

According to a second aspect of the present invention, there is provided the electromagnetic solenoid according to the first aspect, wherein a sectional shape of the inner wall of the guide hole of the stator has a saw-tooth shape.

According to a third aspect of the present invention, in the electromagnetic solenoid of the first or second aspect, a cross-sectional shape of the outer periphery of the movable element has a saw-tooth shape.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side sectional view of the electromagnetic solenoid according to the present embodiment. FIG. 2 is a graph showing the relationship between the stroke of the mover and the electromagnetic attraction force, the solid line is a graph when using the conventional electromagnetic solenoid, and the broken line is a graph when using the electromagnetic solenoid shown in FIG. It is. FIG. 3 is a side sectional view of an electromagnetic solenoid according to another embodiment. FIG. 4 is a graph showing the relationship between the stroke of the mover and the electromagnetic attraction force.
The solid line is a graph when the conventional electromagnetic solenoid is used, and the broken line is a graph when the electromagnetic solenoid shown in FIG. 3 is used. FIG. 5 is a side sectional view of an electromagnetic solenoid according to another embodiment. FIG. 6 is a side sectional view and a partially enlarged view of an electromagnetic solenoid according to another embodiment,
(A) is a side sectional view of an electromagnetic solenoid, and (b) and (c) are partial enlarged views of a stator. In the prior art, the same parts as those of the electromagnetic solenoid described based on FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 1, the electromagnetic solenoid 1
A non-magnetic disk-shaped plate 10, a yoke 11, a coil 12, a stator 14 fixed in the coil 12,
The stator 1 is opposed to the stator 14 and the stator 1
And a coil spring 1 corresponding to an elastic body for urging the movable member 15 against the stator 14 against the load force.
6 and a non-magnetic rod-shaped shaft 18 fixed to the tip of the mover 15.

The electromagnetic solenoid 1 shown in FIG. 1 is different from the conventional one in the following features. That is, the sectional shape of the inner wall of the guide hole 14a of the stator 14 is a sawtooth shape.

The electromagnetic attraction between the stator 14 and the mover 15 is determined by the distance L between the corner of the armature 15 facing the stator 14 and the corner of the stator 14 facing the armature 15. Becomes maximum when is shortest. Therefore, stator 1
By making the cross-sectional shape of the inner wall of the fourth guide hole 14a into a saw-tooth shape, it becomes possible to set a plurality of points where the electromagnetic attraction force changes due to the displacement of the mover 15 at a maximum. However, the stator 1 has a sawtooth shape.
In the cross section where the magnetic flux of the four parts flows, there is a portion having a small area, and a saturation phenomenon of the magnetic flux also occurs. Therefore, the maximum electromagnetic attraction force decreases as the magnetic resistivity increases.

As described above, the sawtooth shape has a large difference in magnitude between two extreme values (maximum value and minimum value) as shown in FIG. Although the maximum value of the electromagnetic attraction force is reduced, a new extreme value is generated between the two extreme values, so that relatively uniform characteristics can be obtained.

According to the present embodiment, the number of the sawtooth-shaped protrusions is three, and the sawtooth having a half thickness in the circumferential direction of the stator 14 is divided into three equal parts in the height direction of the stator 14. However, the difference between the maximum value and the minimum value of the stroke characteristic is from 2.5 [Kgf] to 1.5 [Kg
f], which makes it possible to improve non-uniform stroke characteristics.

As shown in FIG. 3, if the number of the saw-tooth-shaped protrusions is increased (the number of the protrusions is five in FIG. 3), the point of generation of the electromagnetic attraction force increases, and FIG. As shown in (1), more uniform stroke characteristics can be obtained.

When the cross-sectional shape of the outer peripheral side surface of the mover 15 is made to have a sawtooth shape, the number of points at which electromagnetic attraction force is generated increases, and uniform stroke characteristics can be obtained. By shaving the outer peripheral side surface of the mover 15 in order to form, the weight of the mover 15 can be reduced, and the responsiveness of the mover 15 can be improved. Also, forming a saw-tooth shape on the movable element 15 is more effective than forming a saw-tooth shape on the stator 14.
The degree of freedom in dimensions increases.

Further, as shown in FIG. 6, if the angle θ of the apex angle of the sawtooth shape is made as acute as possible (FIG. 6).
6B, the area becomes smaller as the vertex angle θ becomes sharper in the cross section where the magnetic flux near the vertex angle flows.
The uniformity of the magnetic flux density increases, and more uniform stroke characteristics can be realized.

[0024]

As described above, according to the first aspect of the present invention, a coil, a stator made of a magnetic material disposed in the coil, and a movable member disposed in a guide hole of the stator are provided. Solenoid having a mover made of a magnetic material and an elastic body that opposes magnetic attraction between the stator and the mover, the cross section of the stator or the mover has a sawtooth shape in a part thereof. Therefore, it is possible to provide a plurality of electromagnetic attraction force generating points between the stator and the mover, thereby suppressing variations in the electromagnetic attraction force due to the stroke amount of the mover, and providing an electromagnetic solenoid having uniform stroke characteristics. Is provided.

According to the second aspect of the present invention, there is provided the first aspect.
In the electromagnetic solenoid described above, since the cross-sectional shape of the inner wall of the guide hole of the stator is made to have a saw-tooth shape, it is possible to reduce the weight of the stator.

In the invention according to claim 3, claim 1 is
Alternatively, in the electromagnetic solenoid according to the second aspect, since the cross-sectional shape of the outer periphery of the mover has a saw-tooth shape, it is possible to reduce the weight of the mover, and to provide an electromagnetic solenoid having high responsiveness. It has the effect that it becomes possible. Also, an effect is obtained that the saw-tooth shape can be freely formed as compared with the case where the inner wall of the stator has a saw-tooth shape.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an electromagnetic solenoid according to an embodiment.

FIG. 2 is a graph showing a relationship between a stroke of a mover and an electromagnetic attraction force.

FIG. 3 is a side sectional view of an electromagnetic solenoid according to another embodiment.

FIG. 4 is a graph showing a relationship between a stroke of a mover and an electromagnetic attraction force.

FIG. 5 is a side sectional view of an electromagnetic solenoid according to another embodiment.

FIG. 6 is a side sectional view and a partially enlarged view of an electromagnetic solenoid according to another embodiment.

FIG. 7 is a side sectional view of a conventional electromagnetic solenoid.

FIG. 8 is a graph showing a relationship between a stroke of a mover and an electromagnetic attraction force in a conventional electromagnetic linear solenoid.

[Description of Signs] 1 electromagnetic solenoid 12 coil 14 stator 14a guide hole 15 mover 16 elastic body

Claims (3)

[Claims] 1. A coil, a stator made of a magnetic material disposed in the coil, a mover made of a magnetic material movably disposed in a guide hole of the stator, and a stator and a mover. An electromagnetic solenoid comprising: an elastic body that opposes magnetic attraction between said electromagnetic solenoid, wherein a cross section of a part of a stator or a mover has a saw-tooth shape. 2. The electromagnetic solenoid according to claim 1, wherein a cross-sectional shape of the inner wall of the guide hole of the stator has a saw-tooth shape. 3. The electromagnetic solenoid according to claim 1, wherein a cross-section of the outer periphery of the mover has a saw-tooth shape.