JPS5810946B2 - Denjikudo Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electromagnetic drive device in which a movable part performs linear motion.

Conventionally, as a type of electromagnetic drive device, as shown in Figure 1,
The stator 1 is provided with two excitation coils 2A and 2B, and the mover 6 is provided with a permanent magnet 7 magnetized in the axial direction. A method of obtaining power is used.

In this system, the permanent magnet 7 is attached to the side walls 4A, 4 of the stator 1.
A spacer 10 is provided to prevent direct contact with C.

Since the permanent magnet abuts against this spacer 10, the mechanical strength of the permanent magnet 7 becomes a problem.The spacer 10 is made of a special elastic material such as rubber or resin. collide with each other, producing a small amount of vibration and noise.

Furthermore, it is often desired that the driving force obtained during the movement of the mover 6 is large at the start of the movement and small at the end of the stroke, but in the conventional method, the driving force obtained at the start of the movement is small and the driving force is small at the end of the stroke. It had the characteristic of becoming larger at the end.

The present invention solves the above-mentioned drawbacks and provides an electromagnetic drive device that eliminates vibration and noise and makes the stroke operation large at the start and small at the end.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, solenoid-shaped excitation coils 12A and 12B are arranged in the axial direction on the stator 11, and the housing 13 forms a magnetic path.

Excitation coil 12A. Side walls 14A, 1 are provided on both end surfaces of 12B.
4B and 14C are provided to form a magnetic path.

The side walls 14A, 14B, and 14C are provided with ring-shaped protrusions 15A, 15B that protrude in the axial direction of the excitation coil.

15C and 15D are formed.

A cylindrical permanent magnet 17 is magnetized in the axial direction of the movable element 16 and attached to a central shaft 18, and is held by a bearing 19 so as to be able to reciprocate.

113A and 113B are permanent magnets which are essential parts of the present invention, and are cylindrical magnets that are magnetized in the axial direction and are attached to the stator 11 with the same polarity as the permanent magnet 17 of the mover 16 facing each other.

The excitation coils 12A and 12B are connected to a power source 111 so as to generate magnetic fluxes in opposite directions, and the direction of the current is switched by a switch 112.

The operation of this device in the above configuration will be explained.

When no current flows through the excitation coils 12A and 12B, the repulsive force between the permanent magnet 17 of the mover 16 and the permanent magnets 113A and 113B of the stator 11 causes the permanent magnet 17 to be centered on the side wall 14B. The center is aligned.

When the movable element 16 is in this state, the switch 112 is closed and the ring-shaped protrusion 15A is formed on the excitation coil 12A.

The excitation coil 12B has ring-shaped protrusions 15C and 15 so that the poles of the excitation coil 15B are N and S poles as shown in FIG.
D and S, respectively, as shown in Figure 2.

A current is passed in a direction that creates a north pole.

As a result, the N pole of the ring-shaped protrusion 15A, the N pole of the permanent magnet 113A, and the permanent magnet 17 of the mover 16 repel each other, and the N pole of the ring-shaped protrusion 15D and the permanent magnet 17 of the mover 16 are attracted to each other. Because of this, the movable element 16 is urged to the right.

At the end of the stroke, the permanent magnet 17 of the mover 16 and the permanent magnet 113B of the stator 11 have the same S poles facing each other, so the magnets do not come into contact with each other.

If the direction of the current is reversed by the switch 112 at this position, the ring-shaped protrusions 15A and 15B are formed.

The poles generated at 15C and 15D are also reversed, and the movable element 16 is biased to the left in the same manner as described above.

Further, the driving force during one stroke of the movable element 16 is greatest when it is about to start moving at the left end or right end;
The characteristic of the permanent magnet 113 is that it becomes the smallest at the end of the movement.
It can be obtained by selecting A and 113B.

As described above, in the present invention, since the permanent magnets 113A and 113B are provided, the movable element 16 and the stator 11 do not directly collide with each other, so no vibration or noise is generated. To obtain an electromagnetic drive device having characteristics such that the force is strongest at the right end at the beginning of movement, and the movable element 16 can be positioned approximately at the center of the stator 11 when no current is applied to the excitation coils 12A and 12B. Can be done.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional electromagnetic drive device, and FIG. 2 is a sectional view of an electromagnetic drive device of the present invention. 1.11: Stator, 2A, 2B, 12A, 12B: Excitation coil, 4A, 4C, 14A, 14B, 14C: Side wall,
6, 16: Mover, 7, 17, 113A. 113B: Permanent magnet, 18: Central axis.

Claims (1)

[Claims] 1. In an electromagnetic drive device in which a stator is provided with a plurality of cylindrical excitation coils, a stator magnetic path is formed using a high magnetic permeability material, and a permanent magnet is provided in a mover to obtain linear motion, the direction of movement of the mover is determined. In the stator part facing the surface of the mover permanent magnet,
An electromagnetic drive device characterized in that a permanent magnet is provided so that the same poles as the mover permanent magnet face each other.