JPS593839A - Electromagnetic coordinate selector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an electromagnetic coordinate selection device, and in a call path switch using a wave selection method applied to electronic exchanges, etc., the driving iron core is made of a uniform semi-hard material. The present invention relates to the constructed electromagnetic coordinate selection device.

(2) Background of the Invention In general, a harmonic selection type drift selection device such as a communication path switch is arranged in a matrix as shown in FIG.・
and Y direction communication path y, l Yl t y, +・
It has a switch 811 at each IJ wax intersection that connects or disconnects the X-direction communication path and the Y-direction communication path.
8211 + ”'・S31・532T...+84
1 + 842 +... are arranged respectively.

These switches are electromagnetically driven, and a drive core (not shown in FIG. 1) is provided corresponding to each switch. An X-direction excitation winding and a Y-direction excitation winding are wound around each of the drive cores. The switch, drive core, and excitation winding constitute a so-called multi-contact sealed switch.

There is a demand for the drive core of the multi-contact sealed switch to be made of a material that does not require complicated processing.

(3) Prior Art and Problems FIG. 2 is a perspective view showing an example of a conventional drive core. The conventional example shown in the figure is formed by coaxially cladding two types of semi-hard materials 1 and 2 with different holding forces. The drive core has an X-direction excitation winding 3 and a Y-direction excitation winding 4.
is wound.

In addition to the coaxial type drive core, there is also a conventional example in which two types of semi-rigid materials with different holding forces are strung together as two plates.

FIG. 3(,) is a graph showing the magnetic field-magnetic flux density characteristics (hereinafter referred to as B-H characteristics) of the drive core of FIG. 2. In FIG. 3(,), when the magnetic field H applied to the drive core is increased from zero to above H and then reduced to zero again, a residual magnetic flux density B1 remains in the drive core. From this state, the magnetic field H in the opposite direction to the driving iron core! When , the magnetic flux density B becomes zero.

Since the iron core is made of two types of materials, H! of magnetic fields in opposite directions! The magnetic flux density B becomes zero at any value between and H3.

When the magnetic field is made higher than H4 in the opposite direction, the magnetic flux density is B.

becomes.

FIG. 3(b) shows the current pulse applied to the excitation winding wound around the drive core of FIG. 2 and the current iJ? 3 is a graph showing the relationship between the magnetic flux induced in the driving iron core by the magnetic field generated by the magnetic flux. In FIG. 3(b), a current pulse X is passed through the X-direction excitation winding 3 of the selected drive core, and
Since the current Y/4'rus is passed through the directional excitation winding 4,
This driving iron core is excited by a current flow of X+Y=Ix. After the current /4'rus Il flows, it follows the path of ■→■→■→■→■ of the hysteresis curve, and as the magnetic flux Φ1 remains in the drive core, the movable spring of the switch is attracted to the drive core, and its contact point is kept closed. To reset this contact to the open state, a negative current pulse -X may be applied to either the X-direction excitation winding or the Y-direction excitation winding, for example, to the X-direction excitation winding. By applying the current pulse -X, the contact point is opened following the path of ■→■→■→■ of the hysteresis curve.

In a half-selected drive core, the current flows through only one of the excitation windings in the X and Y directions, so it follows the path of ■→■→ of the hysteresis curve, and the residual magnetic flux Φ Since it is insufficient for driving, the contacts are not attracted and the switch remains open.

In addition, in this state, a negative current pulse −X is applied to the X-direction excitation winding.
When is applied, the path of ■→■→■ of the hysteresis curve is followed, so the contact point is 11 in an open state.

In the process of performing these series of operations, if the negative current/mother pulse current value becomes larger than I4, the hysteresis curve becomes
Since the magnetic flux follows the path →■→■, magnetic flux Φ is generated in the opposite direction and the movable spring of the switch is attracted, causing a malfunction in which the switch and switch close.

In order to reduce the possibility of this malfunction as much as possible, the drive core is made of two types of semi-hard materials. In other words, since it is formed of two types of particles, the allowable range of the current value of the reset pulse is I2-1, which is convenient for controlling the current value of the reset pulse.

However, there is a problem in that configuring the drive core with two types of cores is accompanied by difficulties in processing.

(4) Object of the Invention In view of the problems in the prior art described above, the object of the present invention is to select coordinates having a drive core that eliminates processing difficulties by composing the drive core with one type of semi-hard material. The goal is to provide equipment.

(5) Structure of the invention The gist of the present invention to achieve the above object is as follows:
A switch installed at each J-tax intersection trap, a drive core provided corresponding to each of the switches, and an X-direction excitation winding and a Y-direction excitation winding wound around each of the drive cores. The υ line drive iron core is excited by passing a current higher than the positive operating current through the X direction excitation winding and the Y direction excitation winding at the same time to close the switch and the switch, and the X direction excitation is carried out. In an electromagnetic coordinate selection device that opens the switch by flowing a reset current that is less than the closing restoration current and more than the negative operating current through either the winding or the Y-direction excitation winding, The magnetic field-magnetic flux density characteristics of the semi-rigid core made of one material have a nearly constant operating current regardless of the value of the reset current, and the allowable range of the reset current allows the setting of the reset current to be controlled. This electromagnetic coordinate selection device is characterized in that the driving iron core is made of a homogeneous semi-hard material.

(6) Embodiments of the Invention Below, embodiments of the present invention will be explained with reference to FIGS. 4 to 6.

FIG. 4 is a perspective view showing a drive core according to an embodiment of the present invention. As shown in FIG. 4, the drive core 10 is made of one type of uniform semi-hard material. An X-direction excitation winding 30 and a Y-direction excitation winding 40 are wound around this drive core 10 as in the conventional case. The drive core shown in FIG. 4 is made to correspond to each of the switches arranged in a matrix as shown in FIG. 1, and the opening and closing of the switches is controlled.

FIG. 5 is a well-known graph showing the B-H characteristics of the drive core shown in FIG. Since the drive core is made of one type of material, the hysteresis curve in Figure 5 does not have a flat part of the magnetic field that makes the magnetic flux density B zero, and in the past, with -H characteristics, it was impossible to control the reset current. It was thought possible and possible.

However, according to experiments conducted by the present inventors, it has been found that the reset current can be sufficiently controlled even by using a drive core made of a single material.

Figure 6 is an experiment showing the relationship between the current pulse applied to the excitation winding wound around the drive core in Figure 4 and the magnetic flux induced in the drive core by the magnetic field generated by the current pulse. This is a graph obtained by In Fig. 6, the control of closing and opening of the switch corresponding to the selected drive core is performed using the hysteresis curve ■→■→■→
■→■ realizes the closed state, and ■→■→■→■ realizes the open state. The fact that the magnetic flux Φ is discontinuous at the part marked ■ on the hysteresis curve indicates that the switch is closed at a current value of 11. This current value 11 will be referred to as an operating current. Furthermore, the fact that the magnetic flux Φ is discontinuous even in the part (■) of the hysteresis curve indicates that the switch is opened (opened) at the current value I. This current value I!
is called the recovery current. Since current pulses are applied only to either the X-direction excitation winding or the Y-direction excitation winding to the half-selected drive core windings located in the same row and column as the selected drive core, the hysteresis curve ■→
The path of ■→no is followed, and the residual magnetic flux is small, so the corresponding switch is kept open, and even when the selective drive core is restored, the path of ■→■→■ is followed, and the half-selection switch is kept open. dripping

The present invention realized the use of a drive core made of one type of semi-hard magnetic material by discovering the following two characteristics in the hysteresis curve shown in FIG. That is, the first is that the value of the negative reset current Nors applied to the excitation winding of either xt or Y to open the selected switch is 13 and I4. The operating current is always constant at Il and therefore resetts)
The allowable range of the current value of the current no.9 is quite large, I3-I4. The second characteristic is that unless the absolute value of the reset current becomes larger than I4, the contact of the corresponding switch will not malfunction and close. According to experiments,
The absolute value of the current value I4 at which a negative current/bus pulse causes a malfunction is approximately 0.2 from the current value I at which a malfunction occurs when a positive current is applied to either the X or Y excitation winding. There were many people.

Therefore, for example, when the switch is closed, a current of less than IA is applied to both the X-direction excitation winding and the Y-direction excitation winding, and when the switch is restored, a current of -1 or 2 is applied to the X-direction excitation winding.
Under the condition that a current pulse of less than A is applied,
The switch to be manufactured is in the positive direction of X and Y (1+α)
If we only confirm that there is no malfunction at A, we can see that there will be no malfunction at -(1,2+α)A even in the negative direction (where α is the margin).

On the other hand, if the number of turns of the winding is NX t NY and the current at which the contact operates is F, the condition for the switch to close with the following current to I is I CNx + with β as a margin.
Ny ) < (1-β) (Nx + Ny)
-(1) (1+α) The condition for not malfunctioning at A is (l+α) N)C< 1 (NX + NY)-(
2). Normally, it is more advantageous to set Nx==:NY=N, so this condition is expressed in the above equation (1). Substituting into (2), 0.5+, <I<1-β...(3) Now, set the margin to 7=β=0. If IA is 0.6A(I(
0.9A...(4). Conversely, the formula (
4) The corresponding switch is closed by flowing a current in the range expressed by . As long as the winding is excited within this range, according to equation (2), malfunction will not occur even if 1.2 people are passed in the positive direction of X or Y, and therefore even if -1 or 4 people are passed in the negative direction. No malfunctions.

(7) As described in detail, according to the present invention, among the magnetic hysteresis characteristics of the drive core made of a uniform semi-hard material, ■ the operating current has a constant value regardless of the value of the reset current; , and ■The allowable range of reset current is sufficiently wide;
By focusing on these two characteristics, the drive core that constitutes the electromagnetic coordinate selection device was made of a single, uniform material, which has the effect of eliminating the conventional difficulties in manufacturing the drive core. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an outline of a summation selection type coordinate selection device;
Figure 2 is a perspective view showing a conventional drive core, Figure 3 (a) is a graph showing the B-H characteristics of the drive core in Figure 2, Figure 3 (
b) is a graph showing the relationship between the current noyals applied to the excitation winding wound around the drive core in Figure 2 and the magnetic flux induced in the drive core by the magnetic field generated by the current pulse, and Figure 4 is the graph shown in this figure. A perspective view showing a drive core according to an embodiment of the invention, FIG. 5 is a graph showing the B-)I% property of the drive core of FIG. 4, and FIG. It is a graph obtained by experiment showing the relationship between the current pi pulse applied to the excitation winding and the magnetic flux. 811,...844. ...Switch, 10...Drive iron core, 30...X-direction excitation winding, 40...Y-direction excitation winding, 11...Operating current, l! ...Recovery current. Patent Applicant: Fujitsu Limited Patent Attorney: Akira Aoki, Patent Attorney: Kazuyuki Nishidate, Patent Attorney: 1) Yukio, Patent Attorney: Akira Yamaguchi, Yo Y+ Y2 Y3 -----
- Thread 2 drawing procedural amendment (voluntary) July 30, 1980 Director of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Application No. 111506 2, Title of invention Electromagnetic coordinate selection device 3, Amendment Name of patent applicant (522) Fujitsu Ltd. 4゜Representative (+') 3 people) 5. Drawings subject to amendment (Figures 1 to 6) 6. Contents of amendment Official drawings (However, there is no change in the contents) 7. List of attached documents

Claims (1)

[Claims] 1. Switches, switches, and switches placed at each intersection of the matrix
A drive core provided corresponding to each of the switches, and an X-direction excitation winding and a Y-direction excitation winding wound around each of the drive cores, the X-direction excitation winding and the Y-direction excitation winding. By simultaneously passing a current equal to or higher than the positive operating current through the windings, the driving iron core is excited and the switch is closed, and either the X-direction excitation winding or the Y-direction excitation winding is closed. In an electromagnetic coordinate selection device that opens the switches by passing a reset current that is lower than the restoration current and higher than the negative operating current, the magnetic field of a semi-rigid core made of a homogeneous single material is
The magnetic flux density characteristic has a substantially constant operating current regardless of the value of the reset current, and has a sufficiently wide tolerance period for the reset current to enable control of the setting of the reset current. An electromagnetic coordinate selection device is characterized in that the driving iron core is made of a homogeneous semi-hard material.