JPH04170007A - Solenoid actuator - Google Patents

Abstract

PURPOSE:To achieve control at 2 positions and enable size and cost to be re duced by changing polarity of current which is supplied to one coil. CONSTITUTION:A title item is provided with a movable core 14 with a permanent magnet 15, a fixed non-magnetic body 17 and a fixed core 16 which are placed at both sides of the permanent magnet 15 with a specified interval, retention means 18 and 19 which retain the permanent magnet 15 at a neutral position, and a coil 20 which is concentric with the permanent magnet 15 and is placed around it so that current is supplied for allowing polarity to be switched. Therefore, by changing polarity of conduction of current for the coil 20, 3-position control is achieved and only one coil may be provided in a single solenoid, thus achieving a compact and low-cast 3-position control.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solenoid actuator that can be controlled in three positions.

[Prior Art] As a conventional solenoid actuator for controlling three positions, there is a double solenoid type actuator, as shown in FIGS. 6 and 7.

The double solenoid type shown in FIG.
A spool 6 is provided. When the coil 2.3 is de-energized, the spool 6 is held in a neutral position by the spring 4.5, and when one coil 2 is energized,
The spool 6 moves in one direction, and when the other coil 3 is energized, the spool 6 moves in the opposite direction. In this way, control is achieved in three positions.

The double solenoid type shown in Fig. 7 is a so-called direct acting type, and there are two
Two coils 8 and 9 are arranged.

When the coils 8 and 9 are not energized, the spool 7 is held at a neutral position, and when the coil 8 or 9 is energized, it moves in the left-right direction as shown by the arrow.

In this way, it is controlled in three positions.

[Problems to be Solved by the Invention] However, all of these conventional double solenoid types have the problem of being large and difficult to downsize because two coils must be arranged. there were.

Also, since there is a lot of wiring to energize the two coils,
Another problem was that the cost was high.

The present invention has been made in view of these conventional problems, and provides a solenoid that is small and can be controlled in three positions at low cost by changing the polarity of the current supplied to one coil. The purpose is to provide actuators.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a movable iron core provided with a permanent magnet, and a fixed non-magnetic core disposed at a predetermined interval on both sides of the permanent magnet. The permanent magnet includes a body and a fixed iron core, holding means for holding the permanent magnet in a neutral position, and a coil that is arranged concentrically with and around the permanent magnet and is energized so that its polarity can be switched.

[Operation] When the coil is not energized, the movable iron core is held at the neutral position by the holding means. When the coil is energized,
The movable iron core moves as it is attracted or repelled by the fixed iron core, and on the other hand, when the polarity is switched and the coil is energized, the opposite effect occurs.

In this way, control can be performed in three positions by changing the polarity of the current applied to the coil. This single solenoid requires only one coil, so
The size can be reduced, and the number of wirings does not increase, so costs can be reduced.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 and 2 are diagrams showing a first embodiment of the present invention.

First, to conclude the configuration, in FIG. 1, reference numeral 11 denotes a frame of a solenoid actuator 12, which is made of a non-magnetic material. The core 14 is housed. A permanent magnet 15 is integrally provided on the movable iron core 14.

Fixed iron cores 1 are installed at a predetermined interval on both sides of the permanent magnet 15.
6 and a fixed non-magnetic body 17 are fixed to the frame 11.

The interval is determined by the amount of shift of the movable iron core 14, and the movable iron core 14 passes through the fixed non-magnetic body 17 and shifts.

Permanent magnet 15, fixed iron core 16, and fixed non-magnetic material 17
A pair of return springs 18 and 19 as holding means are respectively interposed between the return springs 1 and 1.
8.19 holds the movable iron core 14 at a neutral position when the power is not energized.

20 is a coil provided within the frame 11, and the coil 20 is arranged concentrically with and around the permanent magnet 15, the fixed iron core 16, and the fixed non-magnetic body 17. Further, a pair of terminals 21 and 22 are provided outside the frame 11, and direct current is supplied to the coil 20 via these terminals 21 and 22. In this case, the polarity of the current can be switched.

Next, the operation will be explained.

First, the permanent magnet 15 is magnetized so that the side facing the fixed iron core 16 is N-pole and the side facing the fixed non-magnetic material 17 is S-pole. When the coil 20 is energized with one terminal 21 being positive and the other terminal 22 being negative, the side of the fixed iron core 16 facing the permanent magnet 15 is magnetized to the S pole, and the opposite side is magnetized to the N pole.
The movable iron core 14 is attracted to the fixed iron core 16. Therefore, as shown in FIG. 2(A), the permanent magnet 15 moves against the return spring 18 and approaches or comes into close contact with the fixed iron core 16.

Next, when no current is supplied to the coil 20, an attractive force is generated between the permanent magnet 15 and the fixed iron core 16.
The return spring 18.1.9 holds the movable iron core 14 in a neutral position. FIG. 2(B) shows the state in which it is held in the neutral position.

Next, one terminal 21 is set to negative and the other terminal 22 is set to positive, that is, the polarity is switched, and the coil 20
When energized, the side of the fixed iron core 16 facing the permanent magnet 15 is magnetized to the north pole, and the opposite side is magnetized to the south pole, repelling the fixed iron core 16. Therefore, as shown in FIG. 2(C), the permanent magnet 15 moves against the return spring 19 and approaches or comes into close contact with the fixed non-magnetic body 17.

In this way, three-position control can be performed with a single solenoid.

Since only one coil 20 needs to be disposed, the size can be reduced, and since the number of wirings does not increase, costs can be reduced.

Next, FIGS. 3 and 4 are diagrams showing a second embodiment of the present invention.

This embodiment is an example in which holding means for neutral positioning is provided inside the frame.

In FIG. 3, a check groove 23 is formed in the movable iron core 14 inside the frame 11, and a fixed non-magnetic material 17 has an accommodating portion 26 that accommodates a spring 25 that presses a check ball 24 inserted into the check groove 23. It is set in.

The check groove 23, the check ball 24, and the spring 25 collectively constitute a holding means 27 that holds the movable iron core 14 in a neutral position. Therefore, the return springs 18, 19 can be omitted. Note that the other configurations and effects are the same as those of the previous embodiment.

FIG. 4(A) shows the state when the permanent magnet 15 and the solid non-magnetic material 17 are in close contact, and FIG. 4(B) shows the state when they are neutral.
FIG. 4(C) shows the state when the permanent magnet 15 and the fixed iron core 16 are in close contact with each other, and represents the mechanism that returns to neutral when the excitation to the coil 20 is turned off.

FIG. 5 is a diagram showing a third embodiment of the present invention.

This embodiment is an example in which holding means for neutral positioning is provided outside the frame.

In FIG. 5, a check groove 28 is formed in the movable iron core 14 outside the frame 11, and a storage member 32 has a storage portion 31 that stores a spring 30 that presses a check ball 29 inserted into the check groove 28. frame 11
installed outside the

The check groove 28, the check ball 29, and the spring 30 collectively constitute a holding means 33 that holds the movable iron core 14 in a neutral position. In this embodiment as well, the return springs 18, 19 can be omitted. Note that the other configurations and effects are the same as those of the previous embodiment.

Note that 16 may be replaced with a fixed non-magnetic material, and 17 may be replaced with a fixed iron core.

[Effects of the Invention] As explained above, according to the present invention, by changing the polarity of the current supplied to one coil, control is achieved in three positions. Since the cost does not increase, the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIG. 2 (A
-C) is an explanatory diagram of the operation, Figure 3 is a sectional view showing the second embodiment of the present invention, and Figure 4 (A
-C) is an explanatory diagram of the mechanism returning to neutrality, FIG. 5 is a sectional view showing the third embodiment of the present invention, FIG. 6 is a diagram showing a conventional example, and FIG. 7 is a diagram showing another conventional example. be. In the figure, 11... Frame, 12... Solenoid actuator, 13... Opening, 14... Movable iron core, 15... Permanent magnet, 16... Fixed iron core, 17... Fixed non-magnetic material, 18.19...Return spring (holding means), 2
0...Coil, 21.22...Terminal, 23.28...Check groove, 24.29...Check ball, 25.30...Spring, 26.31...Storage part, 27 .33... Holding means, 32... Storage member. Patent applicant: Fuji Iron Works Co., Ltd.

Claims (3)

[Claims] (1) A movable iron core provided with a permanent magnet, a fixed non-magnetic material and a fixed iron core arranged at a predetermined interval on both sides of the permanent magnet, and a holding means for holding the permanent magnet in a neutral position. and a coil that is arranged concentrically with and around the permanent magnet and is energized so that its polarity can be switched. (2) The solenoid actuator according to claim 1, wherein the holding means is a pair of return springs provided between the permanent magnet, the fixed non-magnetic material, and the fixed iron core. (3) The solenoid actuator according to claim 1, wherein the holding means includes a check groove provided in the movable iron core, a check ball inserted into the check groove, and a spring that presses the check ball. .