JPH03284806A - Electromagnetic mechanism having self-holding function - Google Patents

Abstract

PURPOSE:To maintain a stable state without power consumption and heat generation by installing a soft magnetic stator having hysteresis characteristics in magnetizing characteristics, a moving permanent magnet and a solenoid magnetizing said stator. CONSTITUTION:A stator 2 is composed of a soft magnetic material having hysteresis characteristics. Magnetization induced by the magnetic pole of a rotor 1 and residual magnetization by the magnetization of a solenoid 3 are generated in the stator 2, attraction force mutually work, and the rotor 1 continuously keeps the state in which the rotor 1 is pushed against a stopper. When electricity is conducted through the solenoid 3, the rotor 1 receives clockwise force and is rotated in the direction of the arrow because the magnetic pole of the stator 2 is inverted, and revolution thereof is regulated by a stopper 5 and the rotor 1 is transferred to another stable state after conduction. The stable state is obtained under the state even when the currents of the solenoid 3 are quenched, and the state can be held continuously until electricity is conducted through the solenoid 3 in the opposite direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic mechanism that can be used as an actuator for shutters, electromagnetic relays, valves, display devices, and the like.

(Prior Art) Conventionally, electromagnetic mechanisms in actuators such as electromagnetic relays and electromagnetic valves are based on a combination of the attractive force of an electromagnet and the repulsive force of an elastic body.

In such an electromagnetic mechanism, in order to maintain one state, it is necessary to maintain the energized state, which poses problems in terms of power consumption and heat generation.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and is capable of transitioning from one state to the other with short-time energization, and does not require a holding current in the transitioned state. The object of the present invention is to provide an electromagnetic mechanism that can maintain a transitioned state without causing any damage.

(Means for Solving the Problems) The present invention provides an electromagnetic mechanism having a self-holding function, which includes a stator made of a soft magnetic material having a hysteresis property in magnetization characteristics, and a stator movably provided opposite to the stator. The stator is characterized by having a permanent magnet and a solenoid that magnetizes the stator.

As a movably provided permanent magnet, a rotor having north and south poles at both ends can be used.

The rotation angle of the rotor can be limited to less than 180°.

(Function) In the present invention, a movably provided permanent magnet is attracted to magnetic poles due to residual magnetization of the stator and induced magnetization of the stator, becomes stable, and maintains the first position. In this state, if the solenoid is momentarily energized and the polarity of the stator is reversed, the permanent magnet moves to the second position, but both the residual magnetization of the stator and the induced magnetization of the stator between the magnetic poles are When the permanent magnet is reversed and placed in the second position, it works to maintain a stable state, and the stable state can be maintained without external energy supply.

(Embodiment) FIG. 1 is a schematic configuration diagram for explaining an embodiment of the present invention. In the figure, 1 is a rotor made of a permanent magnet having north and south poles at both ends, 2 is a stator, 3 is a solenoid, 4 is a rotating shaft of the rotor, and 5 is a stopper. The rotor 1 can rotate around the rotation axis 4, but the rotation angle is limited to within 180° by the stopper 5. The stopper 5 can be made of an elastic material that can absorb impact. Although it is attached to the stator in this embodiment, it may be provided on the rotating shaft 4 or at an appropriate location on the frame (not shown), or may be formed integrally with the stator. The stator 2 is made of a soft magnetic material having a hysteresis characteristic, and is magnetized with a polarity depending on the direction of the current when the solenoid 3 is energized.

The operation of the embodiment shown in FIG. 1 will be explained with reference to FIG. (A
) The figure shows a stable state in one position, where the stator 2 has magnetization induced by the magnetic poles of the rotor 1, and
Residual magnetization occurs due to the magnetization of the solenoid 3, and mutual attractive forces act to keep the rotor 1 pressed against the stopper. (B) shows the operation when the solenoid 3 is energized. Since the magnetic pole of stator 2 is reversed,
The rotor 1 rotates in the direction of the arrow in response to a clockwise force, and the rotation is restricted by the stopper 5, and the rotor 1 shifts to the other stable state after energization, as shown in Figure (C).

In this state, the same attractive force as explained in figure (A) works, so even if the current in the solenoid 3 disappears, it will remain in a stable state until the next time the solenoid 3 is energized in the opposite direction. The state can be maintained and the rotor performs binary motion.

FIG. 3 is a sectional view of an example of an electromagnetic valve configured using the above-mentioned electromagnetic mechanism. In the figure, 11 is a population, 12 is an outlet, and 13 is a rotary valve. The rotary valve 13 is interlocked with the rotary shaft 4 explained in FIG.

In this example, the rotary valve 13 is directly connected to the rotating shaft.

In FIG. 3(A), the rotor is in the stable position of FIG. 2(A) and the valve is open. The rotary valve 13 thus allows fluid to flow from the inlet 11 to the outlet 12. To close the valve, a momentary energization is applied as shown in FIG. 2(B), and the rotor is rotated to the stable position shown in FIG. 2(C). In this state, the rotary valve 13 is in the position shown in FIG. 3(B), closing the valve.

If current is applied in the opposite direction, the valve can be opened again.

FIGS. 4 to 6 are for explaining an example of use as an actuator for a shutter.

In the figure, 21 is a stator, 22 is a rotor, 23 is a rotating shaft of the rotor, 24 is a shutter fixed to the rotating shaft, 25 is a substrate, and 26 is an opening provided in the substrate. Although the stopper is not shown, in this example, the rotation angle of the rotor is limited to approximately 90 degrees.

FIG. 4(A) shows a state in which one side is excited,
The shutter 24 is in a substantially upright position. From this state, when temporary excitation in the opposite direction is performed, the fourth
As shown in Figure (B), the shutter 24 rotates to a substantially horizontal position. Therefore, the shutter 24 can open and close the optical path. For example, an opening 26 is provided in the substrate 25, and this opening is opened and closed by a shutter 24 shown in FIG. Fifth
Figure (A) shows a state in which the shutter 24 is upright and the opening 24 is open. From this state, when the shutter 24 is rotated to a horizontal position, the opening 26 is closed.

By arranging the apertures 26 in an 8×8 matrix as shown in FIG. 6, providing each aperture with the above-mentioned shutter, and illuminating from behind, an 8×8 dot display can be obtained. This dot pattern can be used for hologram images.

Note that the stator can also be unipolar.

(Effects of the Invention) As is clear from the above description, according to the present invention, a device that can maintain a stable state without power consumption or heat generation can be easily realized, and can be used for shutters, relays, valves, display devices, etc. It can be applied to actuators. Furthermore, since it has a simple structure, it can be miniaturized, and by using a large number of them and arranging them two-dimensionally, a shutter array or a display device can be realized.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram for explaining one embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation, Fig. 3 is an explanatory diagram in which the present invention is applied to a solenoid valve, and Figs. FIG. 6 is an explanatory diagram in which the present invention is applied to a shutter actuator. 1...Rotor, 2...Stator, 3...Solenoid, 5...Stopper

Claims (1)

[Claims] A self-holding device characterized by having a stator made of a soft magnetic material having hysteresis characteristics in its magnetization characteristics, a permanent magnet movably provided opposite to the stator, and a solenoid that magnetizes the stator. An electromagnetic mechanism with functions.