JPH071735B2 - Polarized electromagnet device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a polarized electromagnet device.

2. Description of the Related Art Conventionally, as a polarized electromagnet device, for example, as shown in FIG. 10, an iron core 1 having a substantially U-shaped cross section in which a coil 14 is wound.
And having a substantially triangular cross-section, both end portions 21, 22 are magnetized to the same magnetic pole, the central portion 23 is magnetized to a magnetic pole different from the both end portions 21, 22, and the both end portions 21, 22 are The permanent magnet 2 sandwiched between the magnetic poles 11 and 12 on both sides of the iron core 1 and the projection 3a provided at the center of the lower surface of the iron core 1 and the recess provided at the center of the upper surface of the permanent magnet 2.
There is a movable iron piece 3 which is swingably supported by 2a and whose both end portions 3b and 3c are arranged so as to be able to abut on both side magnetic pole portions 11 and 12 of the iron core 1.

According to the polarized electromagnet device having the above-described configuration, the coil 14
Based on the excitation and demagnetization, the movable iron piece 3 swings around the protrusion 3a as a fulcrum, and both ends 3b and 3c thereof are magnetic pole portions 11 and 12 of the iron core 1.
And contact each other alternately.

However, according to the above-mentioned polarized electromagnet device, since the permanent magnet 2 has a complicated shape, it takes time and effort to form it, and it is difficult to obtain high dimensional accuracy. Therefore, there is a problem that the positioning accuracy of the movable iron piece 3 is low and the operation characteristics are likely to vary.

Means for Solving the Problems In order to solve the above problems, the present invention has a substantially U-shaped cross-section, has magnetic local parts at both ends, and laterally extends an arm part from below the magnetic pole part. It has a substantially H-shaped plane formed by projecting a core around which a coil is wound between the arm parts and a connecting part between opposite side parts, and is provided on the outer surface of the side part. A pair of swing center shafts are provided so as to project on the same axis, and the swing center shafts are rotatably supported so that the end portions of the side portions can alternately contact the arm portions of the iron core. The movable iron side and the both ends are magnetized to the same magnetic pole, the central part is magnetized to a magnetic pole different from the both ends, and the upper surface of the central part is integrated with the lower surface of the connecting part of the movable iron piece. And a permanent magnet whose both end surfaces are arranged so as to face the magnetic pole portion of the iron core with a gap.

Action and Effect Therefor, according to the present invention, the permanent magnet can integrate the upper surface of its central portion with the lower surface of the connecting portion of the movable iron piece, and
It is not necessary to have a complicated shape as in the conventional example, as long as both the tip surfaces can face the magnetic pole portions on both sides of the iron core with a gap, and for example, a simple flat plate shape may be used. Become.

Therefore, the permanent magnet can be formed by punching,
Molding becomes simple and high dimensional accuracy can be obtained.

Moreover, since the movable iron piece and the permanent magnet are integrated with each other, there is no rattling between them, and in addition to the improvement of the dimensional accuracy, the positioning accuracy of the movable iron piece and the permanent magnet is increased, and the operation characteristics are uniform. .

Embodiment An embodiment according to the present invention will be described below with reference to the accompanying drawings of FIGS. 1 to 9.

The polarized electromagnet apparatus according to the present embodiment generally includes an iron core 1 and
It is composed of a permanent magnet 2 and a movable iron piece 3.

The iron core 1 has a substantially U-shaped cross section, and both tip portions are magnetic pole portions 11,1.
On the other hand, the arm portions 11a and 12a are respectively provided to project laterally from below the magnetic pole portions 11 and 12, and the coil 14 is wound between the arm portions 11a and 12a.

The permanent magnet 2 has a flat plate shape that can be positioned between the magnetic pole portions 11 and 12 of the iron core 1, and both end portions 21 and 22 thereof are magnetized to the N pole and the central portion 23 thereof is magnetized to the S pole. is doing. The permanent magnet 2 is arranged so that both end surfaces thereof face the magnetic pole portions 11 and 12 with a gap therebetween via a movable iron piece 3 described later.

The movable iron piece 3 has a substantially H-shaped plane formed by bridging the connecting portion 35 between the opposite side portions 31 and 32, and the lower surface of the connecting portion 35 is integrated with the upper surface of the central portion 23 of the permanent magnet 2. While becoming
Swing center shafts 33, 34 are provided on the outer surfaces of the opposing side portions 33, 34 so as to project on the same axis, and can swing freely via the swing center shafts 33, 34.

As a method of swingably supporting the movable iron piece 3, for example, as shown in FIG. 9, guide grooves 41, 42 are engraved on the inner surfaces of the case 4 facing each other, and the guide grooves 41, 42 are There is a method in which the swing center shafts 33, 34 formed by insert molding the movable iron piece 3 and the permanent magnet 2 are slid from above and supported.

Then, the movable iron piece 3 is swung about the swing center shafts 33 and 34, so that the tip portions 31 of the side piece portions 31 and 32 thereof.
The a, 31b and 32a, 32b are arranged so as to alternately contact and separate from the upper surfaces of the arm portions 11a, 12a of the iron core 1, respectively.

Therefore, according to the polarized electromagnet device having the above-mentioned configuration, when the coil 14 is not excited (FIGS. 1 and 2),
The magnetic flux (shown by the dotted line) flowing out from the one end 21 of the permanent magnet 2 flows from the arms 11a and 11a of the magnetic core 11 of the iron core 1 to the side portions 31 and 32 of the movable iron piece 3 and the connecting portion 35. To flow into the central portion 23 of the permanent magnet 2 to close the magnetic circuit.

On the other hand, the magnetic flux (shown by the alternate long and short dash line) flowing out from the other end portion 22 of the permanent magnet 2 flows from the magnetic pole portion 12 of the iron core 1 to the arm portions 11a, 11a located on the opposite side, and the permanent magnet 2 of the permanent magnet 2 has the same structure as described above. Although it flows into the central portion 23 to form a magnetic circuit, since it is smaller than the magnetic force due to the magnetic flux flowing out from the one end portion 21 of the permanent magnet 2, the movable iron piece 3 holds that state.

Next, when the coil 14 is excited so as to cancel the magnetic flux (FIGS. 3 and 4), the magnetic flux of the coil 14 (shown by the chain double-dashed line) is generated from the arm portions 12a, 12a of the iron core 1 to the sides. It flows to the tip portions 31b and 32b of the portions 31 and 32, flows into the arm portions 11a and 11a through the tip portions 31a and 32a located on the opposite side, and closes the direct circuit.

At this time, since the magnetic force of the magnetic pole portion 12 side increases due to the magnetic flux of the coil 14, the movable iron piece 3 swings clockwise around the swing center shafts 33 and 34 in FIG. After the tip portions 31a, 32a of the and 32 are separated from the arm portions 11a, 11a of the iron core 1,
Tip portions 31b and 32b of the side portions 31 and 32 contact the arm portions 12a and 12a of the iron core 1.

Therefore, as shown in FIGS. 5 and 6, the magnetic flux (shown by the dotted line) flowing out from the other end 22 of the permanent magnet 2 passes through the magnetic pole portion 12 of the iron core 1 and its arms 12a, 12a. To the side portions 31 and 32 of the movable iron piece 3, and further flows from the connecting portion 35 into the central portion 23 of the permanent magnet 2 to close the magnetic circuit.

On the other hand, the magnetic flux (shown by the alternate long and short dash line) flowing out from the one end 21 of the permanent magnet 2 is passed through the arms 12a, 12a located on the opposite side from the magnetic pole 11 of the iron core 1 to the side portion 31 of the movable iron piece 3. , 32, and flows into the central portion 23 of the permanent magnet 2 in the same manner as described above to close the magnetic circuit.

Then, even if the coil 14 is de-excited, the magnetic force of the permanent magnet 2 keeps the movable iron piece 3 in that state.

Further, when the coil 14 is excited in the opposite direction to the above, the movable iron piece 3 performs the operation opposite to the above, and returns to the original state.

[Brief description of drawings]

1 to 9 show an embodiment according to the present invention,
1 and 2 are perspective views and front views showing a non-excitation state, FIGS. 3 and 4 are perspective views and front views showing immediately after excitation and before swinging, and FIGS. 5 and 6 are swinging views. FIGS. 7 and 8 are perspective views and front views showing the state immediately after the movement, FIGS. 7 and 8 are perspective views and front views showing the state after the operation is completed, FIG. 9 is an exploded perspective view showing the support structure, and FIG. It is a front view showing an example. 1 ... iron core, 2 ... permanent magnet, 3 ... movable iron piece, 11, 12
...... Magnetic pole part, 14 ...... Coil, 21,22 ...... End part, 23 ...... Central part, 31, 32 ...... Side part, 33, 34 ...... Swing central axis, 35 ......
Connection part.

Claims (1)

[Claims] 1. A cross-section having a substantially U-shape and having magnetic pole portions at both tip portions, arm portions projecting laterally from below the magnetic pole portions, and a coil is wound between the arm portions. It has a plane substantially H-shape formed by bridging a connecting portion between the iron core and the opposite side portions, and a pair of swing center shafts are provided on the same axial center so as to project on the outer surface of the side portions. At the same time, a movable iron piece that rotatably supports the swing central axis and is arranged so that the tip of the side portion can alternately come into contact with the arm of the iron core, and both ends are magnetized to the same magnetic pole. On the other hand, the central portion is magnetized to a magnetic pole different from the both end portions, the upper surface of the central portion is integrated with the lower surface of the connecting portion of the movable iron piece, and both tip surfaces face the magnetic pole portion of the iron core with a gap. A polar electromagnet device, comprising: a permanent magnet arranged so that