JPH07263220A - Rotary solenoid - Google Patents

Abstract

PURPOSE:To suppress rebound phenomenon at the time of excitation while shortening the rotary operation time by providing a rotary pole with an auxiliary pole which comes into contact with a fixed electrode at the ending position of rotation thereby preventing the lowering of torque and enhancing the coercive force. CONSTITUTION:A movable pole 4 is provided with an auxiliary pole (b) which comes into contact with a fixed pole 3 at the ending position of rotation of the movable pole 4. When the movable pole 4 is shifted by one halt or two third or more of a set rotational angle, the auxiliary pole (b) provided for the movable pole 4 causes magnetic action on the fixed pole 3 and the torque is enhanced significantly in the latter halt of rotational range. Furthermore, the auxiliary pole (b) comes into contact with the fixed pole 3 at the ending position of rotation thus enhancing the coercive force significantly. This structure shortens the operating time and realizes a rotary solenoid which satisfies the requirements of high response.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a roller having no axial movement.
The present invention relates to the configuration of a magnetic circuit of a Tally solenoid.

[0002]

2. Description of the Related Art FIG. 1 is a transverse sectional view of a conventional rotary solenoid and a longitudinal sectional view thereof. As shown in FIG. 1, a fixed magnetic pole 3 and a movable magnetic pole 4 made of a magnetic material face each other perpendicularly to the axial direction, and these magnetic poles are located on both sides of the coil 1 and have a cylindrical case 2 made of a magnetic material. A non-magnetic end plate 6 that surrounds the coil 1 and has a function of extending the axis of the movable magnetic pole 4 is provided.
The magnetic circuit is arranged outside the magnetic poles located on both sides of the coil 1 so that the magnetic flux flows between the fixed magnetic pole 3, the movable magnetic pole 4, the yoke 5, and the case 2.

The fixed magnetic pole 3 and the movable magnetic pole 4 are divided into N according to the rotation angle as shown in FIG. 2, and the positional relationship between the fixed magnetic pole 3 and the movable magnetic pole 4 and the rotation angle are set by the coil bobbin 7.
It is determined by the stopper part a which is integrally molded with.

(2) When the coil 1 is energized, a magnetic force is generated between the fixed magnetic pole 3 and the movable magnetic pole 4, and the movable magnetic pole 4 has a small magnetic resistance.
In FIG. 2, it moves while rotating clockwise. To return this to its original position, a return spring 9 is attached to a non-magnetic shaft 8 assembled with the movable magnetic pole 4.

FIG. 2 shows an example in which the magnetic pole is divided into four parts, and the characteristic a in FIG. 5 shows the relationship between the rotation angle and the torque according to this structure. However, as shown in the characteristic diagram, when it approaches the end point of a certain rotation angle, the torque decreases and the rotation operation time is delayed, and rebound during excitation is large, which is a drawback. Is not suitable.

[0006]

An object of the present invention is to shorten the rotating operation time by improving the magnetic force at the time of rotating operation to prevent the decrease of torque and improving the holding force by only partially changing the shape of the rotating magnetic pole. It is an object of the present invention to provide a rotary solenoid that can reduce the rebound phenomenon during excitation without increasing the number of parts and the cost.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In order to improve the drawbacks of the conventional structure, an auxiliary magnetic pole is provided on the movable magnetic pole so as to contact the fixed magnetic pole at the rotation end position of the movable magnetic pole. Its structure is shown in FIGS. 3 and 4, and its cross-sectional view is the same as FIG. In the figure, 1 is a coil, 2 is a case, 3 is a fixed magnetic pole, 4 is a movable magnetic pole, 5 is a yoke, and 6 is an end plate.
G, 7 is a coil bobbin, 8 is a shaft, 9 is a return spring, 10 is a bearing, a is a stopper portion, and b is an auxiliary magnetic pole according to the present invention.

When the coil 1 is energized, a magnetic force is generated in a magnetic circuit composed of a case 2, a fixed magnetic pole 3, a movable magnetic pole (3) 4 and a yoke 5 surrounding the coil 1, so that the movable magnetic pole 4 is axially moved. It rotates in the direction of small magnetic resistance, clockwise in the figure, without moving.

Here, as shown in FIG. 4, when the movable magnetic pole 4 moves about 1/2 rotation or 2/3 rotation of the set rotation angle or more, the auxiliary magnetic pole b provided on the movable magnetic pole 4 is moved between the fixed magnetic pole 3 and the auxiliary magnetic pole b. As a result of the characteristic B of FIG. 5, the torque is greatly improved over the conventional characteristic B in the latter half of the rotation range. Further, since the auxiliary magnetic pole b comes into contact with the fixed magnetic pole 3 at the rotation end point, the holding force can be greatly improved.

Due to the effect of this torque improvement, a margin is created for the load of the return spring 9, and the rotational operation time can be improved. Further, even if the load of the return spring 9 is increased as compared with the case of the conventional type, a certain operation time can be obtained,
In addition, the return time can be shortened.

Further, due to the effect of improving the holding force, the movable magnetic pole 4
It is possible to reduce the number of rebounds and the rebound time. By improving the characteristics in this way, the time per cycle is shortened, and it is possible to cope with the operation in a high-speed cycle, which is a very effective means.

A rotary solenoid provided with an auxiliary magnetic pole on the fixed magnetic pole side is disclosed in, for example, Japanese Patent Laid-Open No. 59-144357. The rotary solenoid has the advantages that the structure is simpler and the workability is easier than the disclosed technology.

[0013]

According to the present invention, by changing the shape of the rotating magnetic pole and providing the auxiliary magnetic pole, the torque and the holding force can be improved, and the operating time can be shortened. A tally solenoid can be realized. (4)

[Brief description of drawings]

FIG. 1 is a sectional view common to the conventional type and the present invention type.

FIG. 2 is a diagram showing a conventional magnetic pole shape.

FIG. 3 is a diagram showing a magnetic pole shape of the present invention.

FIG. 4 is a diagram showing a state in which the present invention makes about 1/2 rotation.

FIG. 5 is a comparative characteristic diagram of torques of the conventional type and the present invention type.

[Explanation of symbols]

 1 coil 2 case 3 fixed magnetic pole 4 movable magnetic pole 5 yoke 6 end plate 7 coil bobbin 8 shaft 9 return spring 10 bearing a stopper b auxiliary magnetic pole

Claims (1)

[Claims] 1. A fixed magnetic pole and a movable magnetic pole rotatably arranged in the fixed magnetic pole face each other perpendicularly to the axial direction, and are located on both sides of the coil together with a cylindrical case. In a rotary solenoid in which a magnetic circuit is formed by surrounding a coil and a movable magnetic pole freely rotates in a fixed magnetic pole according to a magnetic field, an auxiliary magnetic pole is provided on the rotating magnetic pole, and the auxiliary magnetic pole is at a rotation end position. The rotary solenoid is characterized in that it is configured to come into contact with the fixed magnetic pole.