JPH0610989A - Electromagnetic damper - Google Patents

Abstract

PURPOSE:To provide large braking force by burying permanent magnets in a plunger at a constant interval so that the same poles are faced to each other, winding split solenoid coils on the outside of the plunger, and providing a damper having an outer yoke on the outside of the coil and its braking force control device. CONSTITUTION:A damper main body is constituted of permanent magnets 1 and solenoid coils 11, the magnetic path with the magnetic fluxes in the radial direction of a damper shaft effective for braking a plunger 3 interlinked with the coils 11 is formed, and the braking force is generated by the change of the interlinking magnetic fluxes when the plunger 3 is moved relatively to the coils 11. The coils 11 are split into multiple coils 11, the axial length of one coil 11 is made equal to or smaller than the axial length of the permanent magnet 1 in the plunger 3, and magnetic fluxes in opposite directions are prevented from being concurrently applied to one coil 11 to offset the braking force. When the currents induced in the individual coils 11 are controlled by an external controller 23, the optional braking force can be obtained at the optional timing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorber for automobile shock absorbers, various other industrial machines and precision machines.

[0002]

2. Description of the Related Art As shown in FIG. 5, in a conventional electromagnetic damper, a voltage is induced in a coil 11 by the movement of a permanent magnet 1, and the resulting current is consumed as a jule heat, so that a braking force is applied to the permanent magnet 1. Was being given.

[0003]

In the conventional method, since one set of permanent magnet and coil is used, a sufficient braking force cannot be obtained, and the braking force changes depending on the distance between the permanent magnet and the coil. There was a flaw.

Further, since the induced current is consumed as heat by adding the resistance of the coil or the load resistance to the coil, it is impossible to control the induced current, that is, the braking force.

[0005]

DISCLOSURE OF THE INVENTION The present invention has solved the above-mentioned problems of the prior art, and relates to braking of a plunger that directly moves in a solenoid coil, and a plurality of them are arranged at regular intervals so that the same pole faces the plunger. Of the permanent magnet is embedded, a plurality of divided solenoid coils are wound around the outer cylinder of the plunger, and a damper having an outer cylinder yoke on the outside of the solenoid coil, and a control device for controlling the braking force of the damper. It is an electromagnetic damper.

That is, the same poles are made to face each other to a plunger which gives a braking force, a plurality of permanent magnets at fixed intervals are embedded, and the plunger is moved in a solenoid coil divided into a plurality of portions, whereby the solenoid coil is formed. The induced electromotive force is obtained to damp the motion of the plunger.

Further, an electric power control element is inserted in each solenoid coil so that short-circuiting and opening / closing of both ends of the solenoid coil are controlled by an external controller.

[0008]

By dividing the permanent magnet and the solenoid coil embedded in the plunger into a plurality of pieces, the combination of the solenoid coil and the permanent magnet becomes a plurality, and a large braking force can be obtained.

If the plunger is inside the solenoid coil, the same braking force can be obtained regardless of the position of the plunger.

Further, by opening and closing both ends of each solenoid coil by the controller, an arbitrary braking force can be obtained at an arbitrary timing.

[0011]

1 to 3 show an embodiment of the present invention.
FIG. 1 is a cross-sectional view of a damper main body, 1 is a permanent magnet incorporated in a plunger 3, 2 is a spacer, 4 is a plunger outer cylinder, 11 is a divided solenoid coil, 12 is a bobbin for winding the solenoid coil 11, 13 Is an outer cylinder yoke for forming a magnetic path.

As in the magnetic path of the permanent magnet 1 shown in FIG. 2, the magnetic flux exits from the N pole of the permanent magnet 1, traverses the solenoid coil 11, passes through the outer cylinder yoke 13, passes through the solenoid coil 11 again, and passes through the S pole. Return to.

An example of the braking force control system is shown in FIG. 21
Is a load to be damped, 22 is a sensor that detects the movement of the load 21, 23 is a controller that controls the braking force, 24
Is a power control element (thyristor) for controlling the induced current generated in the solenoid coil 11.

The controller 23 detects the motion of the vibration damping target 21, opens and closes both ends of the solenoid coil 11 in accordance with the motion, and continuously controls the braking force.

[0015]

According to the present invention, a permanent magnet and a solenoid coil are arranged as shown in FIG. 1 to form a damper body, so that a magnetic flux in the radial direction of the damper shaft, which is effective for braking the plunger, is linked to the solenoid coil. Is formed and the plunger moves relative to the solenoid coil,
A braking force is generated by the change in the interlinkage magnetic flux.

Further, by dividing the solenoid coil into a plurality of pieces and making the axial length of one solenoid coil equal to or shorter than the axial length of the permanent magnet in the plunger,
It is possible to avoid that the magnetic flux in the opposite direction (outward of the shaft radius, inward of the shaft radius) acts on one solenoid coil at the same time and cancel the braking forces, and the current induced in each solenoid coil is controlled by the external controller. By opening and closing at, any braking force can be obtained at any timing.

As shown in FIGS. 4 (a) and 4 (b), if the power control element (thyristor, triac, etc.) is quickly ignited, the load current will be increased after the ignition until an induced voltage of reverse polarity is generated. Flow and braking force are obtained.

In FIG. 4, (a) shows the case where the braking force is large, (b) shows
Indicates the case where the braking force is small, and between the ← → marks in the figure,
The load current flows and the braking force works.

[Brief description of drawings]

FIG. 1 is a sectional view of a damper body according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the damper shown in FIG.

FIG. 3 is an explanatory diagram in which a braking force control system is added to FIG. 1.

FIG. 4 is a wobble of the principle of braking force control, in which (a) is a case where the braking force is large and (b) is a case where the braking force is small.

FIG. 5 is a conventional damper configuration diagram.

[Explanation of symbols]

 1 Permanent Magnet 2 Spacer 3 Plunger 4 Plunger Outer Cylinder 11 Solenoid Coil 12 Bobbin 13 Outer Cylinder Yoke 21 Vibration Target 22 Sensor 23 Controller 24 Thyristor

Claims (1)

[Claims] 1. Braking of a plunger interlocking in a solenoid coil, wherein a plurality of permanent magnets are embedded in the plunger at regular intervals so that the same poles face each other, and the plunger is divided into an outer cylinder. 2. An electromagnetic damper comprising: a damper having a solenoid coil wound around it and an outer cylinder yoke provided outside the solenoid coil; and a controller for controlling a braking force of the damper.