JPS5810847B2 - Shyakuhougatadenjishayakuuchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, a conventional open-circuit electromagnet device includes an intermediate magnetic body C in which aluminum or other non-magnetic foil is overlapped on the side surface between a pair of magnetic plates a and a'. A permanent magnet d is attached to the magnetic pole surface e at the upper end of the magnetic plates a and a'.

Adsorb the movable iron piece f to e' and move the movable iron piece f to the magnetic pole faces e, e.
The spring force of the spring h acting in the direction of pulling it away from the magnetic pole surface e
, e', a tripping coil h is wound around at least one of the magnetic plates a and a', and the magnetic flux of the permanent magnet (l is The magnetic flux created by the current that branches paths 11 and 13 and flows through the coil h flows through the magnetic path 12 because the magnetic permeability of the permanent magnet d is small, and the direction of the magnetic flux in the magnetic path i2 generated by the current in the coil h and the permanent magnet d When the coil h is energized so that the direction of the magnetic flux of the magnetic path 11 is reversed, the movable iron piece f is moved by the spring force of the spring g to the magnetic pole face e,
e', and it is necessary to provide an intermediate magnetic body C to form a magnetic path through which the magnetic flux generated by the current of the coil h flows. Therefore, the magnetic flux of the permanent magnet d flows through the magnetic path i1.
In order to divide the flow into i3 and attract and hold the movable iron piece f against the spring force of the spring g, the magnetic pole faces e, e' and the movable iron piece f
The contact surface with the permanent magnet d must be a mirror surface, and the permanent magnet d
In addition, the magnetic resistance of the current in the coil h due to the non-magnetic foil is large, and the ampere turns of the coil h required to separate the movable iron piece f from the magnetic pole faces e and e' are large. was there.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and the embodiments of the present invention will be described below with reference to the drawings.
a and 1a are a pair of magnetic plates; magnetic plate la has two poles 2a and 2b integrally protruding from its upper end;
A single pole 2c is projected from the upper end of b.

Reference numeral 3 denotes a permanent magnet installed between the magnetic plates 1a and Ib, and magnetic pole faces 4a, 4b, 4 at the tips of the poles 2a, 2b, 2c.
c are arranged on the same plane, and the magnetic pole faces 4a, 4b, 4c
The centers of gravity of the magnetic pole faces 4a, 4b, and 4c are optimally located at the three vertices of an equilateral triangle.

5 is a movable iron piece that is brought into contact with and attracted to the magnetic pole surfaces 4a, 4b, and 4c;
A spring that is elastically loaded to act in a direction to pull the six movable iron pieces 5 away from the surfaces 4a, 4b, and 4e of the magnetic pole surface 4a.
.

The spring force of the spring 6 acts on a portion of the movable iron piece 5 that corresponds to a line segment connecting the center of gravity of a triangle whose vertices are the centers of gravity of the magnetic pole faces 4a and 4b. It is optimal when done as such.

7 is a tripping coil that can be wound around at least one of the poles 2a and 2b.

The present invention has the above configuration, and the movable iron core 5 is connected to the permanent magnet 3.
The magnetic flux of the magnetic pole faces 4a, 4 resists the spring force of the spring 6.
b and 4c, and when a current is applied to the tripping coil 7, the magnetic flux passing between one of the magnetic pole faces 4a and 4b and the movable iron piece 5 becomes smaller, and the movable iron piece 5 is moved by the spring force of the spring 6. Magnetic pole surface 4a.

4b and 4c.

In addition, in the release type electromagnet device of the present invention, the output voltage of the zero-phase current transformer is applied to the tripping coil 5, and when the leakage current of the distribution line exceeds a certain level, the movable iron piece 5 moves between the magnetic pole faces 4a, 4. b.

4c, the earth leakage breaker opens and closes the breaker by operating the breaker opening mechanism when the movable iron piece 5 moves.
It is used for.

Thus, the present invention provides a permanent magnet between the base end portions of the first magnetic plate 1a having two poles 2a and 2b and the second magnetic plate 1b having one pole 2c.

A movable iron plate 5 of the vertically movable type is placed on the magnetic pole surface 4a, 4b, 4c at the tip of each pole 2a, 2b, 2c with a stone 3 interposed therebetween.
are separated by a spring 6 so that they face each other, and at least one of the first magnetic plates 1a is equipped with a coil 7. Therefore, in the conventional example shown in FIG. a
' and the movable iron plate f, two sides of the magnetic plate a and the intermediate magnetic body C, then two sides of the magnetic plate a' and the non-magnetic foil, and the non-magnetic foil. 2 with intermediate magnetic body C
In contrast to the mirror finish on a total of nine surfaces, two of the first magnetic plates 1a
Only four surfaces are required: the book poles 2a, 2b, one pole 2c of the second magnetic plate 1b, and the movable iron plate 5. Therefore, it is not only easy to finish, but the more surfaces there are, the larger the air gap will be. Naturally, the magnetic resistance increases,
Although the ampere turns of the coil used to separate the movable iron plate are larger, the sensitivity of the operation is improved in this respect as well.

Furthermore, the present invention provides two poles 2a of the first magnetic plate 1a.
, 2b, the magnetic flux of the coil 7 is superimposed on either one of the coils, and the separation sensitivity is lost accordingly, but the sensitivity is improved by the fact that the air gap is much smaller than before (this loss). This has the effect of promoting high sensitivity.

[Brief explanation of the drawing]

FIG. 1 shows a conventional release type electromagnet device, where FIG. 1A is a front view and FIG. 1A is a side view. FIG. 2 shows an embodiment of the present invention, and FIG. 2A is a front view, and FIG. 2A is a side view. la, 1b are magnetic plates, 2a, 2b, 2c are poles, 3 is a permanent magnet, 4a, 4b, 4c are magnetic pole surfaces, 5 movable iron pieces, 6 a spring, 7 a tripping coil.

Claims (1)

[Claims] 1. Two balls 2a whose tips are magnetic pole faces 4a and 4b.
, 2b, and a magnetic plate whose tip magnetic polar surface 4c is located in the same horizontal plane as the magnetic pole surfaces 4a, 4b of the balls 2a, 2b of the first magnetic material plate 1a. a second magnetic plate 1b having a ball 2c, a permanent magnet 3 interposed between the base ends of the magnetic plates 1a, 1b and magnetically coupled to each other, and a magnetic pole surface of each of the balls 2a, 2b, 2c. 4a, 4b. 40, a vertically elevating movable iron plate 5 that moves toward and away from the magnetic pole surface 40, a spring 6 that acts to separate the movable iron plate 5 from each magnetic pole surface 4a, 4b, and 4c, and at least one of the first magnetic plate 1a. A release type electromagnet device made with a coil T equipped with.