JP2001112233A - Linear actuator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Since the use of expensive rare earth magnets increases along with the improvement of thrust, the cost of the motor itself increases, which has been one of the factors that hinder industrialization. SOLUTION: 1 is a yoke, 2 'is a permanent magnet, and 3 is an armature coil portion. Since the magnetic fluxes from the permanent magnets 2 and 2 ′ are linked to the armature coil section 3, a predetermined current is applied to the armature coil section 3, and the armature coil section 3 is formed according to Fleming's left-hand rule. 3 moves due to the generation of thrust. At this time, a plurality of permanent magnets 2 having a magnetization direction substantially perpendicular to the drive direction and a plurality of permanent magnets 2 'having a magnetization direction substantially drive direction are arranged in the drive direction. The magnetic flux can be efficiently linked to the coil portion 3 to increase the thrust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to OA equipment, control equipment, electronic equipment, machine tools, semiconductor and liquid crystal manufacturing equipment,
The present invention relates to a linear actuator that generates a linear driving force in a medical device or the like.

[0002]

2. Description of the Related Art Conventionally, as a linear actuator,
FIG. 7 is known. FIG. 7 shows a top view of a conventional linear actuator.
The permanent magnet 3 magnetized in the direction shown therein is constituted by an armature coil.

The operation of the linear actuator configured as described above will be described below.

[0004] Since a magnetic flux from the permanent magnet 2 is linked to the armature coil 3, a predetermined current is applied to the armature coil 3. And move.

[0005]

However, in the above-mentioned conventional structure, the use of expensive rare earth magnets is increased along with the improvement of thrust, so that the cost of the motor itself is increased, which is one of the factors that hinder industrialization. Had become.

The present invention solves such a conventional problem and provides a linear actuator capable of efficiently increasing a thrust in a linear actuator.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an armature coil and a plurality of permanent magnets formed in a substantially driving direction with a predetermined gap formed on both sides of the armature coil. And a linear actuator comprising a yoke disposed outside the permanent magnet, wherein the permanent magnet is
A linear actuator, wherein a plurality of permanent magnets having a magnetization direction substantially in the drive direction and a plurality of permanent magnets having a magnetization direction substantially perpendicular to the drive direction are arranged in the substantially drive direction.

As described above, by arranging a plurality of permanent magnets having a magnetization direction substantially in the drive direction and a plurality of permanent magnets having a magnetization direction in a direction substantially perpendicular to the drive direction, The magnetic flux can be efficiently linked to the armature coil to increase the thrust.

[0009]

DETAILED DESCRIPTION OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an armature coil, a plurality of permanent magnets which are formed in a predetermined gap on both sides of the armature coil and are disposed substantially in a driving direction. In a linear actuator comprising a yoke disposed outside the permanent magnet, the permanent magnet includes a permanent magnet having a magnetization direction substantially in a driving direction, and a permanent magnet having a magnetization direction substantially perpendicular to the driving direction. A linear actuator, wherein a plurality of the linear actuators are arranged substantially in a driving direction. As described above, a plurality of permanent magnets having a magnetization direction substantially in the drive direction and a plurality of permanent magnets having a magnetization direction in a direction substantially perpendicular to the drive direction are arranged substantially in the drive direction. Thus, the magnetic flux can be efficiently linked to increase the thrust.

A recess or a protrusion is formed on at least one surface of the permanent magnet or the yoke, and the adjacent permanent magnet or the permanent magnet and the yoke are fixed by fitting the protrusion or the recess. Things.

In addition, an elastic body for preventing collision is provided at an end of the armature coil in the driving direction.

An armature coil, a plurality of permanent magnets arranged in a substantially driving direction with predetermined gaps formed on both sides of the armature coil, a yoke arranged outside the permanent magnet, A moving table that moves integrally with the armature coil; and a guide portion that slides and supports the moving table, wherein the permanent magnet has a magnetization direction substantially perpendicular to a permanent magnet having a magnetization direction substantially in the drive direction. And a moving table device in which a plurality of permanent magnets having a plurality of permanent magnets are arranged in a substantially driving direction.

[0013]

(Embodiment 1) A moving table apparatus according to this embodiment is shown in FIG. The moving table device 21 fixes the housing part 23 on the support base 22. A linear actuator 24 and a support rail 2 of the moving table are provided on both sides of the linear actuator 24.
5 and 26 are provided. The moving table 30 is located above the linear actuator 24,
4 and move together with the moving piece. At this time, the load of the movable table 30 and the load 31 carried on the movable table 30 is supported by the support rails 25 and 26, and the movable table 30 slides on the support rails 25 and 26.

FIG. 2 is a top view of the linear actuator according to the first embodiment, and FIG. 3 is a sectional view of the linear actuator. 1 is a yoke, 2 and 2 'are permanent magnets magnetized in the direction shown in FIG. 2, and 3 is an armature coil portion. The armature coil section 3 is configured by protecting the armature coil 35 with a resin section 36 as shown in FIG.

The operation of the linear actuator configured as described above will be described below. Since the magnetic fluxes from the permanent magnets 2 and 2 ′ are linked to the armature coil section 3, a predetermined current is applied to the armature coil section 3, and the armature coil section 3 is formed according to Fleming's left-hand rule. 3
The thrust is generated and moves. At this time, a plurality of permanent magnets 2 having a magnetization direction substantially perpendicular to the drive direction and a plurality of permanent magnets 2 'having a magnetization direction substantially drive direction are arranged in the drive direction. Coil section 3
Thus, the magnetic flux can be efficiently linked to increase the thrust.

Embodiment 2 FIG. 5 is a top view of a linear actuator according to a second embodiment of the present invention.
5, 1 is a yoke, 2 'is a permanent magnet magnetized in the direction shown in FIG. 5, and 3 is an armature coil. The difference from FIG. 1 is that the yoke 1 and the permanent magnets 2 and 2 'are provided with concave portions or convex portions as shown in FIG.

The operation of the linear actuator configured as described above will be described below. Since the magnetic fluxes from the permanent magnets 2 and 2 ′ are linked to the armature coil section 3, a predetermined current is applied to the armature coil section 3, and the armature coil section 3 is formed according to Fleming's left-hand rule. 3
The thrust is generated and moves. At this time, a plurality of permanent magnets 2 having a magnetization direction substantially perpendicular to the drive direction and a plurality of permanent magnets 2 'having a magnetization direction substantially drive direction are arranged in the drive direction. Coil section 3
Thus, the magnetic flux can be efficiently linked to increase the thrust. Further, since the yoke 1 and the permanent magnets 2 and 2 'are provided with concave portions or convex portions, positioning can be easily performed. Such a linear actuator may be used for the moving table device according to the first embodiment.

(Embodiment 3) FIG. 6 is a top view of a linear actuator according to a third embodiment of the present invention.
In FIG. 6, 1 is a yoke, 2 is a permanent magnet magnetized in the direction shown in FIG. 3, 3 is an armature coil portion,
Is composed of an elastic body for preventing collision. The difference from FIG. 2 is that a collision preventing elastic body 4 as shown in FIG.

The operation of the linear actuator configured as described above will be described below. Since the magnetic fluxes from the permanent magnets 2 and 2 ′ are linked to the armature coil section 3, a predetermined current is applied to the armature coil section 3, and the armature coil section 3 is formed according to Fleming's left-hand rule. 3
The thrust is generated and moves. At this time, a plurality of permanent magnets 2 having a magnetization direction substantially perpendicular to the drive direction and a plurality of permanent magnets 2 'having a magnetization direction substantially drive direction are arranged in the drive direction. Coil section 3
Thus, the magnetic flux can be efficiently linked to increase the thrust. Further, the provision of the collision preventing elastic body 4 at the end of the armature coil section 3 in the driving direction can prevent the armature coil section 3 from being damaged due to collision. Such a linear actuator may be used for the moving table device according to the first embodiment.

[0020]

As is apparent from the above embodiments, according to the first and fourth aspects of the present invention, the permanent magnet having the magnetization direction substantially in the drive direction and the magnetization direction substantially perpendicular to the drive direction are provided. By arranging a plurality of permanent magnets substantially in the driving direction, it is possible to efficiently link the magnetic flux to the armature coil portion and increase the thrust.

According to the second aspect of the present invention, a concave portion or a convex portion is formed on at least one surface of the permanent magnet or the yoke, and the adjacent permanent magnet or the permanent magnet and the yoke are provided with the same. Since the projection or the recess is fixed by fitting, the positioning can be easily performed.

According to the third aspect of the present invention, since the armature coil is provided with an elastic body for preventing collision at the end in the driving direction, the armature coil is damaged by the collision. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a moving table device according to a first embodiment of the present invention.

FIG. 2 is a top view showing the linear actuator.

FIG. 3 is a sectional view of the linear actuator.

FIG. 4 is a diagram showing the armature coil unit;

FIG. 5 is a top view showing a linear actuator according to a second embodiment of the present invention.

FIG. 6 is a top view showing a linear actuator according to a third embodiment of the present invention.

FIG. 7 is a top view showing a conventional linear actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke 2, 2 'permanent magnet 3 Armature coil part 4 Elastic body for collision prevention

Claims (4)

[Claims] 1. A linear system comprising: an armature coil; a plurality of permanent magnets having a predetermined gap formed on both sides of the armature coil and arranged in a substantially driving direction; and a yoke provided outside the permanent magnet. In the actuator, the permanent magnet may include a plurality of permanent magnets having a magnetization direction substantially in the drive direction and a plurality of permanent magnets having a magnetization direction substantially perpendicular to the drive direction. Features a linear actuator. 2. At least one of a permanent magnet or a yoke.
The linear actuator according to claim 1, wherein a concave portion or a convex portion is formed on a surface, and the adjacent permanent magnet or the permanent magnet and the yoke are fixed by fitting the convex portion or the concave portion. 3. An armature for preventing collision is provided at an end of the armature coil in a driving direction.
The linear actuator as described. 4. An armature coil, a plurality of permanent magnets formed in a substantially driving direction by forming a predetermined gap on both sides of the armature coil, a yoke provided outside the permanent magnet, A moving table that moves integrally with the armature coil; and a guide portion that slides and supports the moving table, wherein the permanent magnet has a magnetization direction substantially perpendicular to a permanent magnet having a magnetization direction substantially in the drive direction. A movable table device in which a plurality of permanent magnets having a plurality of permanent magnets are arranged in a substantially driving direction.