JP2569179B2 - Magnetic trip device for electronic circuit breakers - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit breaker, and more particularly, to a release type magnetic trip device for adjusting a breaking operation current value.

[Conventional technology]

In the prior art, there is a technique disclosed in JP-A-61-239533 to 239536 as an attempt to stabilize the breaking operation characteristic, and a technique disclosed in Japanese Utility Model Laid-Open No.
The operation characteristics are adjusted by changing the magnetic circuit from the outside.

[Problems to be solved by the invention]

The former of the above-mentioned prior arts has a problem that variations in parts such as springs, permanent magnets, coils, and instability of work due to caulking are not sufficiently considered, resulting in variations in a breaking operation current value. In the latter case, the fixed core becomes unstable and the adsorption state between the fixed core and the movable core is not constant, so the breaking operation current value becomes unstable, and the stroke of the movable core changes with the movement of the fixed core. This makes it impossible to trip the breaker mechanism.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic trip device for an electronic circuit breaker capable of solving the above-mentioned problem and adjusting a breaking operation current value from outside after assembly.

[Means for solving the problem]

The object is to move the permanent magnet in a tangential direction by rotating a guide that supports the plunger slidably in the axial direction in the circumferential direction to change the distance between the permanent magnet and the center of the plunger, or to change the distance between the permanent magnet and the guide. Is provided by changing the position of the magnetic body by rotating the guide in the circumferential direction and adjusting the breaking operation current value. Further, the plunger is brought into contact with the permanent magnet. May be provided, and the breaking operation current value may be adjusted by rotating the fixed core from outside to change the facing area between the permanent magnet and the fixed core.

[Action]

Since each of the above configurations changes the magnetic flux passing through the plunger, the cutoff operation current value changes by this,
Variations in the magnetic flux density of the permanent magnet, load error of the operating spring,
Variations in the breaking operation current value due to factors such as the state of adhesion to the yoke when the plunger is attracted can be adjusted.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a reference sectional view showing a structure of a tripping device for an electronic circuit breaker according to the present invention, wherein 1 is a permanent magnet, 2 is a reverse excitation coil, 3 is a yoke, 4 is a plunger, 5 is an operation spring, Reference numeral 6 denotes a guide that serves as a guide for moving the plunger 4 in the direction of the arrow A or B.

In the above configuration, the plunger 4 is normally attracted to the yoke 3 in the direction of arrow A against the urging force of the operation spring 5 by the action of the magnetic force of the permanent magnet 1. When the reverse excitation coil 2 is energized, a magnetic flux in the direction opposite to the magnetic flux of the permanent magnet 1 is generated, and the attractive force of the permanent magnet 1 in the direction of arrow A is released by the magnetic force of the reverse excitation coil 2 in the direction of arrow B. Then, it is protruded in the direction of arrow B by the urging force of the operation spring 5 to mechanically perform the trip operation. Therefore, the breaking operation current value of the reverse excitation coil 2 only needs to be a current value necessary to apply an excitation force to the arrow B at least larger than the attraction force of the permanent magnet 1 in the direction of the arrow A. However, this current value depends on the variation in the magnetic flux density of the permanent magnet 1 and the operating spring 5.
Load error, yoke 3 when plunger 4 is adsorbed
Variations in the breaking operation current value are likely to occur due to factors such as the state of adhesion to the circuit. The present invention provides a means for adjusting and changing a breaking operation current value which is a characteristic value for operating the magnetic trip device, and an embodiment will be described below.

FIG. 2 (a) is a sectional view of an embodiment of the electronic circuit breaker tripping device according to the present invention, and FIG. 2 (b) and FIG. 2 (d) are (a).
FIG. 3 is a schematic diagram showing a positional relationship between the permanent magnet 1 and the plunger 4 in the drawing, and FIG. 4C is a diagram showing a change in the position of the permanent magnet 1 accompanying rotation of the guide 6 in FIG. That is, in this embodiment, a guide 6 for guiding the operation of the plunger 4 is provided as one of means for changing the breaking operation current value.
Is rotated to move the position of the permanent magnet 1 to change the relative distance between the permanent magnet 1 and the plunger 4,
Thus, the permeance of the magnetic circuit including the permanent magnet 1, the plunger 4, and the yoke 3 is changed to adjust the cutoff operation current value. FIG. 3 is a diagram showing a change in the breaking operation current value due to the movement of the position of the permanent magnet 1 and a positional relationship between the permanent magnet 1 and the guide 6 for operating the permanent magnet 1 smoothly and without any looseness. When the breaking operation current value is high with reference to the relational position in FIG. 3B, the guide 6 is rotated to change the state of FIG. Is in the state of (c), and the breaking operation current value is increased. FIG. 4 is a characteristic diagram showing the relationship between the rotation angle (deg) of the guide 6 and the breaking operation current value (%), wherein (a), (b) and (c) in the figure are (a) in FIG. , (B) and (c). FIG. 5 is an enlarged view showing the shape of the guide 6 of the present embodiment. The permanent magnet 1 always contacts the guide 6 at at least two points, and the breaking operation current value is within the allowable range (FIG. 4S). It is formed so that the rotation amount of the permanent magnet 1 can be adjusted so as not to be excessive.

FIG. 6 is an external perspective view of a trip device having a display unit for adjusting a breaking operation current value. The display can be performed by rotating the guide 6 to change the breaking operation current value. For example, FIG. 5A shows that the guide 6 is assembled so that it becomes a reference value at a position of 0, and when the breaking operation current value is lower than the reference value due to a variation factor, the guide 6 rotates in the + direction, and when the breaking operation current value is higher, it becomes-. In the example of turning in the direction, and as shown in FIG.
The adjustment can be easily performed by associating the display with the current value of the excess or deficiency according to the extent of deviation from the reference value at the time of adjustment.

According to this embodiment, since the breaking operation current value of the magnetic trip device can be adjusted by the guide 6 from the outside, the yield can be improved even when assembling by caulking. In addition, since the guide 6 of the plunger 4 is formed integrally with the adjustment knob, the amount of rotation of the guide 6 can be displayed, and the number of parts can be reduced, thereby making it possible to reduce the size and cost.

Another embodiment is shown in FIGS. 7 (a) and 7 (b). In this embodiment, the permanent magnet 1 is held fixed as shown in FIG.
By embedding the magnetic body 8 in the guide 6 of the plunger 4 and rotating the guide 6, the permanent magnet 1 → plunger 4 → magnetic body 8 → yoke 3 → permanent magnet 1 as shown in FIG.
The breaking operation current value can be adjusted by changing the magnetic flux passing through the path. The function and effect are the same as those of the embodiment shown in FIG.

Still another embodiment is shown in FIGS. 8 (a), (b) and (c). (A) As shown in the figure, a small and thin permanent magnet 1 is attached to a yoke 3, and a fixed core 11 for adsorbing a plunger 4 separated by a shield plate 9 at a position in contact with the permanent magnet 1 and a shield core 9. A crimped operation lever 10 is provided, and (b)
As shown in FIG. 3C, the operating lever 10 is rotated by using a driver to change the facing area between the permanent magnet 1 and the fixed core 11, thereby changing the magnetic flux passing through the plunger 4.
It adjusts the breaking operation current value. In this embodiment, the fixed coil 11 is rotated by the operation lever 10 from the bottom side of the magnetic trip device.
In the case of a small-sized magnetic trip device that uses a device, there is a feature that external adjustment and display are possible.

〔The invention's effect〕

According to the present invention, by turning the guide from the outside, it is possible to easily adjust the breaking operation current value of the magnetic trip device while also displaying the adjustment allowing function, thereby improving reliability. This has a remarkable effect on miniaturization and weight reduction, and reduction in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a reference sectional view showing the structure of a trip device for an electronic circuit breaker according to the present invention, FIG. 2 is an explanatory view of the operation of the first embodiment of the present invention in a transverse section and a longitudinal section, and FIG. FIG. 4 is a diagram showing a change in the relative position between the permanent magnet and the guide of the embodiment of FIG. 1, FIG. 4 is a characteristic diagram showing a relationship between the turning angle of the guide of the embodiment of FIG. 1 is a view showing the shape of the guide of the embodiment, FIG. 6 is an external perspective view of a trip device having a display unit for adjusting a breaking operation current value, and FIG.
FIG. 8 is a view showing another embodiment of the present invention. 1 ... permanent magnet, 2 ... reverse excitation coil, 3 ... yoke,
4 ... Plunger, 5 ... Operation spring, 6 ... Guide, 7
... this plate, 8 ... magnetic material, 9 ... shielding plate, 10 ... operation lever, 11 ... fixed core.

Claims (3)

(57) [Claims] 1. A plunger provided in a yoke and slidable in the axial direction of the yoke, a permanent magnet for exciting the plunger in a forward direction and a reverse exciting coil for exciting the plunger in a reverse direction.
A magnetic trip device for an electronic circuit breaker having an operation spring for urging the plunger in a reverse excitation direction, wherein a guide for instructing the plunger to be slidable in the axial direction, and the guide in a circumferential direction. Means for moving the permanent magnet in a tangential direction by rotating, and adjusting a breaking operation current value by a change in a distance between the permanent magnet and the center of the plunger accompanying the circumferential rotation of the guide. A magnetic trip device for an electronic circuit breaker, characterized in that: 2. A plunger provided in a yoke and slidable in the axial direction of the yoke, a permanent magnet for exciting the plunger in a forward direction and a reverse exciting coil for exciting the plunger in a reverse direction.
A magnetic trip device for an electronic circuit breaker, comprising an operation spring for urging the plunger in a reverse excitation direction, a guide for supporting the plunger slidably in the axial direction, and a magnet provided in the guide. A magnetic trip device for an electronic circuit breaker, comprising: a body; and adjusting a breaking operation current value by changing a position of the magnetic body in accordance with a circumferential rotation of the guide. A plunger provided in the yoke and slidable in the axial direction of the yoke; a permanent magnet for exciting the plunger in a forward direction; and a reverse exciting coil for exciting the plunger in a reverse direction.
A magnetic trip device for an electronic circuit breaker, comprising an operation spring for urging the plunger in a reverse excitation direction, wherein a fixed core that contacts the permanent magnet via a shield plate to attract the plunger, and the shield plate. And an operating lever provided integrally with the permanent magnet, and by turning the operating lever in a circumferential direction, a facing area between the permanent magnet and the fixed core is changed to adjust a breaking operation current value. Magnetic trip device for electronic circuit breakers.