JPH08223894A - Linear driver - Google Patents

Abstract

PURPOSE: To eliminate the generation of operating sound and to increase an initial drive force by exciting first and second poles to attract first and second magnetic circular cylinders, and driving an actuator against a back spring. CONSTITUTION: Annular poles 4a and 4b protrude from the inner periphery of a soft steel cylinder 2, the separate distance is set to the same as a pole width, and an exciting coil 5 is mounted between the poles 4a and 4b. The vacant hole at the center of side plates 3a and 3b of both sides of the cylinder 2 is used as a bearing to so support a soft steel circularly cylindrical actuator 1 as to laterally slide in such a manner that the actuator 1 has circular cylinders 1a, 1b having large diameters and the width and the separate distance of the cylinders 1a and 1b are equal to the width of the poles 4a and 4b. A load B is interlocked to the left end of the actuator 1, and held in a stopped state by a back spring. The coil 5 is energized to drive the load B via the actuator 1 by large magnetic flux amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION It is used as a means for reciprocating a member of a mechanical device for a set stroke by controlling energization.

2. Description of the Prior Art There are electromagnetic plungers to achieve the same purpose.

[0002]

The electromagnetic plunger, which is a conventionally well-known means, has the following two problems to be solved. First problem A loud shock noise is generated during operation. Second problem There is a disadvantage that the force is the smallest at the initial stage when the output is the most necessary and becomes the largest at the end point of the operation.

[0003]

[Means for Solving the Problems] A magnetic cylinder serving as an actuator, which is supported by a bearing of an outer casing so as to be movable left and right in the axial direction, and a predetermined cylinder fixed coaxially with the cylinder at a predetermined distance. The first and second magnetic cylinders having a large width and a large diameter, and the annular first and second magnetic poles having the same width and the same distance as the first and second magnetic cylinders are provided inside the outer casing. A stator provided with magnetic bodies serving as magnetic paths around the outer circumferences of the first and second magnetic poles, and an exciting coil mounted in an annular gap between the first and second magnetic poles, The outer circumferences of the first and second magnetic cylinders and the inner circumferences of the first and second magnetic poles are opposed to each other with a slight gap therebetween, and the back spring presses the actuator to set the first and second magnetic poles. Means for holding the actuator at a position where the right end of the body cylinder and the left ends of the first and second magnetic poles face each other;
By energizing the exciting coil, the first and second magnetic cylinders are magnetically attracted to the first and second magnetic poles, respectively, to drive the actuator in the axial direction, and to load the load connected to the actuator. It is configured to drive.

[0004]

[Operation] By energizing the exciting coil, the first and second
Magnetize the magnetic poles to attract the first and second magnetic cylinders,
The actuator is driven against the back spring to linearly drive the corresponding load, and the energization is cut off to spring back the actuator and the load. There is a feature that the initial suction force is increased without generating mechanical noise during the operation.

[0005]

The details of the present invention will be described with reference to FIG.
Items with the same symbol in each drawing have the same function, so
The duplicated description will be omitted. FIG. 1 is a diagram showing the appearance. The side plates 3a and 3 are provided to the left and right of the symbol 2 which is a cylindrical outer casing.
b is fixed, the actuator 1 is driven to the left and right, and a load (not shown) is connected to the left end of the actuator 1. 2 is shown in FIG.
FIG. In FIG. 2, the cylinder 2 made of mild steel serves as a magnetic path that also serves as an outer casing. On the inner peripheral surface of the cylinder 2, annular magnetic poles 4a and 4b are provided so as to project. The widths of the magnetic poles 4a and 4b are equal, and the distance between them is equal to the magnetic pole width,
An annular excitation coil 5 is mounted between the magnetic poles 4a and 4b.

On both sides of the cylinder 2, side plates 3a and 3b are fastened. The holes in the center of the side plates 3a and 3b serve as bearings,
A column 1 which is an actuator made of mild steel is supported so as to slide left and right. The portions indicated by symbols 6a and 6b are the bearings of the above-mentioned holes. Large diameter cylinders 1a and 1b are formed in the cylinder 1 by cutting, and the widths of the cylinders 1a and 1b are the magnetic poles 4a and 4b.
b, and the distance between them is also equal to the width of the magnetic poles 4a and 4b. The outer circumferences of the cylinders 1a and 1b and the inner circumferences of the magnetic poles 4a and 4b face each other with a gap of 0.1 to 0.2 mm between them. A load B is connected to the left end of the cylinder 1 and the load B is left. The column 1 is elastically repelled by a spring, and is stopped and held at the position shown by a restraining member (not shown).

As shown, the cylinders 1a and 1b have their right ends facing the left ends of the magnetic poles 4a and 4b by a slight length. Means for providing the above-mentioned structure will be described below. The inside of the mild steel cylinder is cut to form the magnetic pole 4b, and then the exciting coil 5 is inserted and fixed from the left side. Although not shown, this terminal is led out to the outside from the hole shown by the dotted line 5a.
Next, an annular mild steel is made and inserted from the left side and fixed at the position indicated by symbol 4a. Next, the side plate 3b is fastened. Next, the cylinder 1 is inserted from the left side, and the right end thereof is inserted into the hole 6b.
Next, the left end of the column 1 is inserted into the hole 6a of the side plate 3a and fastened with screws as shown in the drawing.

When the exciting coil 5 is energized, the magnetic flux is generated by the magnetic pole 4.
a → cylinder 1a → cylinder 1 → cylinder 1b → magnetic pole 4b → outer casing 2 →
Since it becomes a closed circuit by passing through, the amount of magnetic flux is large, so that the driving force of the cylinder 1 which is the actuator in the direction of arrow A becomes large and drives the load B in the same direction. When the energization is stopped, it springs back and returns to the illustrated state. As can be understood from the above description, the linear drive device for the load B can be obtained, and the load B can be quietly driven without producing a sound, which has an operation effect.

The graph of FIG. 5 is a graph of load driving force, where the horizontal axis is the movement distance of the actuator 1 and the vertical axis is the suction force. In the known electromagnetic plunger, the initial attraction force is small and the attraction force at the end is maximum, as shown by the curve 7. In the device of the present invention, as shown by the curve 8, the initial suction force is large and then gradually decreases. Therefore, there is a feature that a large load can be driven. The above operation will be described with reference to FIG.
In FIG. 6, the magnetic pole 4a and the cylinder 1a show a cross section, and magnetic force lines 9a, 9b and 9c indicated by arrows are generated at the facing portions. At this time, the magnetic pole 4a is excited to the N pole, and the cylinder 1a is excited to the S pole by magnetic induction. The magnetic force lines 9a at the facing portion have little influence on the attraction force in the arrow A direction, but the attraction lines in the arrow A direction can be obtained by the magnetic force lines 9b and 9c. The attraction force by the magnetic force line of the arrow 9a is proportional to the square of the current of the exciting coil,
The attraction force by the magnetic lines of force of arrows 9b and 9c is proportional to the first power of the current. Also, when the void length is 0.1 mm or less,
Since the magnetic force line of the arrow 9a is perpendicular to the facing surface and the attraction force disappears, there is a feature that the initial attraction force is large and the attraction force is flat as shown by the curve 8 in the graph of FIG.

FIG. 3 is a sectional view of another embodiment of the device of the present invention. In FIG. 3, the bearing 12 of the side plates 10a and 10b
A cylinder 1 is supported by a and 12b so as to slide left and right, and an annular magnetic pole 4 is provided on both sides of an annular mild steel magnetic body.
a and 4b are provided so as to project, an exciting coil 5 is mounted in the central hole, and side plates 10a and 1 are provided on both sides of the magnetic poles 4a and 4b.
It is fixed at 0b. Reference numeral 12 is a spring that repels the cylinder 1 as an actuator to the left. When the exciting coil 5 is energized, the cylinders 1a, 1b are attracted and moved in the direction of arrow A by the magnetic poles 4a, 4b, and the cylinder 1 drives the load. To do. The function and effect are the same as those of the configuration of FIG. Therefore, the object of the present invention can be achieved.

FIG. 4 is a plan view of the magnetic poles 4a and 4b shown in FIG. Reference numeral 11 indicates a magnetic body having annular magnetic poles 4a and 4b as shown by the same reference numeral in FIG. Symbol 11a
Since it is cut into two pieces on the left and right with the line shown by,
The excitation coil 5 is sandwiched and fixed from the left and right. Therefore, there is an effect that the excitation coil 5 can be easily attached. The driving mode of the actuator 1 when the exciting coil 5 is energized is the same as that of the previous embodiment, and therefore its explanation is omitted.
As can be understood from the above description, by controlling the energization,
There is a feature that the linear drive of the load can be performed silently in a mode in which the initial driving force is large.

[0012]

As described above, it is possible to obtain a linear drive device that drives a load silently and has a large initial driving force and a small reduction in the driving force thereafter.

[0013]

[Brief description of drawings]

FIG. 1 is an external view of the device of the present invention.

FIG. 2 is a sectional view of the device of the present invention.

FIG. 3 is a sectional view of another embodiment of the device of the present invention.

FIG. 4 is a plan view of a magnetic path 11 and an exciting coil 5.

FIG. 5 is a graph of the moving distance of the actuator and the suction force.

FIG. 6 is an explanatory diagram of magnetic flux generated by magnetic poles.

[Explanation of symbols]

 1 Cylindrical actuator 1a, 1b Magnetic cylinder 2,4a, 4b, 11 Magnetic pole and magnetic path 3a, 3b, 10a, 10b Side plate B Load 5 Exciting coil 12 Spring 12a, 12b Bearing 11a Joint part 7, 8 Attraction force Curves 9a, 9b, 9c Graphs of magnetic force lines

Claims (1)

[Claims] 1. A magnetic cylinder that serves as an actuator and is supported by a bearing of an outer casing so as to be movable left and right in the axial direction, and has a diameter of a predetermined width that is fixed coaxially with the cylinder at a predetermined distance. The large first and second magnetic cylinders and the annular first and second magnetic poles having the same width and separation distance inside the outer casing as those of the first and second magnetic cylinders are provided. A stator provided with a magnetic body serving as a magnetic path on the outer circumference of the second magnetic pole, an exciting coil mounted in an annular gap between the first and second magnetic poles, The outer circumference of the second magnetic cylinder and the inner circumference of the first and second magnetic poles are opposed to each other with a slight gap, and the back spring presses the actuator to set the right ends of the first and second magnetic cylinders. Section and means for holding the actuator at a position where the left ends of the first and second magnetic poles face each other, and , The second magnetic cylinder is magnetically attracted to the first and second magnetic poles to drive the actuator in the axial direction, and to drive the load connected to the actuator. Characteristic linear drive device.