JP3098882B2 - Electromagnetic solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electromagnetic solenoid, and more particularly to an electromagnetic solenoid capable of selectively holding multiple positions.

[0002]

2. Description of the Related Art Conventionally, in order to perform this type of operation, two DC or AC solenoids are used in the case of a three-position operation, and one of the solenoids is operated from a neutral point, or one of the solenoids is operated. There is known a structure in which a plurality of coils are wound around a solenoid, and the coils are moved right and left by selective energization of the coils to provide a center position by a spring.

[0003]

2. Description of the Prior Art When the above two solenoids are used, there is a disadvantage that the cost is high and the mounting space is large, and in the latter case, the spring is opposed to the spring force of the spring. The speed is slow because the plunger is moved, and the power supplied to the coil is large. (2)

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide an electromagnetic solenoid which is small, inexpensive and can operate at high speed.

[0005]

According to the present invention, a plurality of exciting coils are provided in one solenoid, and a magnet (permanent magnet) is fixed to a part of a movable body such as a plunger. By selectively or simultaneously energizing the plunger, the plunger is moved to the left or right or to the center, and the plunger is held at the moving position by using the attraction force between the magnet and the magnetic body (fixed), thereby increasing the speed. It is intended to achieve a small size.

[0006]

1 is a sectional view showing the structure of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a resin bobbin, 2-1 and 2-2 denote excitation coils wound around the bobbin, and 3 denotes a bobbin. 1 is a plunger (movable iron core) slidably mounted in the center in the longitudinal direction, 4 is a shaft (output shaft) coupled to the plunger 3, and 5 is a non-magnetic non-magnetic member in contact with the rear end of the bobbin 1. An end plate, 6 is an annular yoke (magnetic material) mounted on the front end of the bobbin 1, 7 is a non-magnetic case surrounding the bobbins 1 to 6 and 8 is a case of the case 7. A magnetic material that is fixed to the open end and also serves as a joint. Next, reference numeral 9 denotes a magnet, and a gap spacer 11, 1 by an E-ring 10.
1 '(polyester, etc.), side plates 12, 12'
Together with the shaft 4. Numeral 13 denotes an annular magnetic body mounted with a gap between the magnet 9 and a nonmagnetic ring spacer 14, 14 'made of resin or the like, and inscribed in the case 7. Numeral 15 denotes a bearing of the shaft 4, L1, L2 and L3, L4 denote excitation coils 2-1, 2
-2 lead line.

Next, the operation of the embodiment of the present invention will be described. FIG. 2 is a diagram showing a driving circuit (3) of the solenoid according to the present invention, showing an example in which a DC power supply E is connected to excitation coils 2-1 and 2-2 via a three-point switch SW, respectively.
First, when the switch SW is brought into contact with the contact S0 to energize the exciting coil (between L1 and L2), a magnetic circuit is formed between the exciting coil (2-1) and the plunger 3, and the plunger 3 is turned on.
Is sucked and slides leftward, and the magnet 9 contacts the yoke 6 via the sub plate 12 and the spacer 11,
Adsorbed. In this state, the state of FIG. 1 is maintained by the holding force of the magnet 9 even after the coil (2-1) is deenergized.

Next, when the switch SW is brought into contact with the contact S1, the exciting coils (2-1, 2-2) are energized and the coil 2-
1 and a magnetic circuit formed by plunger 3 and coil 2-2
And the magnetic circuit formed by the plunger 3 is balanced, and the plunger 3 slides slightly to the right. In this state, FIG.
As shown in (1), the magnet 9 is provided at the position, that is, the center position, by the magnetic force of the annular magnetic body 13 and an air gap provided opposite to each other. This state is maintained even after the coil is deenergized, as described above.

When the switch SW is further connected to the contact S2, the coil 2-1 is deenergized, and only the coil 2-2 is energized. As a result, the magnetic balance is lost, and the plunger 3 slides rightward. As shown in FIG. 4, it is held by the magnetic force between the magnet 9 and the magnetic body 8. This state is maintained even after the coil 2-2 is deenergized. Therefore, according to the present embodiment, left and right positioning can be performed by selectively energizing and deenergizing the exciting coil, and central positioning can be obtained by simultaneously energizing and deactivating.

In the above embodiment, an example in which two excitation coils are provided and one annular magnetic body sandwiched between non-magnetic bodies is provided to perform three-point positioning has been described. However, if the present invention is applied,
It is possible to further increase the number of exciting coils and, consequently, to increase the number of annular magnetic bodies, to move the plunger in proportion to multiple points or to select and select a coil to move and hold (4) the plunger in proportion.

[0011]

As is apparent from the above description, according to the present invention, the plunger can be easily moved and held at multiple positions by selectively or simultaneously energizing or deactivating a plurality of exciting coils. Therefore, a small, inexpensive solenoid which can be operated at high speed and is suitable for remote control or machine tools can be provided, so that the practical effect is great.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a drive circuit diagram according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating the operation of the present invention.

FIG. 4 is a diagram illustrating the operation of the present invention.

[Explanation of symbols]

 1: bobbin 2-1, 2-2: excitation coil 3: plunger 4: shaft 5: end plate 6: yoke 7: case 8: magnetic body 9: magnet 10: E-ring 11: gap space (5) 12: Side plate 13: Annular magnetic body 14: Spacer

Claims (1)

(57) [Claims] 1. A plurality of exciting coils 2-1 and 2-2 wound on a bobbin 1, a plunger slidable in a longitudinal direction at the center thereof, a shaft 4 coupled to the plunger 3, and A magnet 9 fixed to the shaft 4,
A non-magnetic case 7 surrounding them, an annular yoke 6,
A magnetic body fixed to the open end of the case and an annular magnetic body sandwiched between the annular non-magnetic body and inscribed in the case; An electromagnetic solenoid characterized in that the coil is moved to the left, right, and center by the selective and simultaneous energization of the coil, and the position is maintained even after the coil is deenergized.