JPS61248316A - Monostable type polar solenoid - 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 [Technical Field] The present invention relates to a monostable polarized solenoid applied to monostable relays and the like.

[Background technology]

FIGS. 8 and 9 show a monostable relay with a normally closed contact configuration to which a conventional example is applied. That is, 50 is a monostable type polarized solenoid, which includes a coil 51, a coil frame 52, and a movable iron core 5.
3. Fixed iron core 54, bias spring 55, first yoke 5
6, a second yoke 57, and a permanent magnet 58. Reference numeral 59 denotes a contact portion, which includes a movable contact 61 inserted into a movable frame 60 of a movable iron core 53, movable contacts 62, 63, and a fixed contact 6.
4, 65, fixed contact plates 66, 67, contact pressure springs 68, and stoppers 69. Figure 7 shows the non-excited state.
The movable core 53 is attracted to the fixed core 54 by the permanent magnet 58 against the bias spring 55 and the contact pressure spring 68,
Movable contacts 62, 63 are in contact with fixed contacts 64, 65. FIG. 8 shows an excited state in which the permanent magnet 58 supplies magnetic flux from the coil 51 in the opposite direction to the magnetic flux passing through the movable iron core 53, thereby reducing the attractive force that attracts the movable iron core 53 to the fixed iron core 54, and the contact pressure spring 68 and bias spring 55 move the movable core 53 upwards in the figure, and the movable contacts 62.63 separate from the fixed contacts 64.65.

FIG. 10 shows the relationship between the attraction force and spring load of this relay, where Ql is the non-excitation attraction force, Q2 is the spring load, and Q3 is the excitation attraction force. In the non-excited state shown in Figure 8, the attractive force Q1
Since this is larger than the spring load Q2, the state shown in the figure is maintained and the contact is in a normally closed state. In this state, when a current is applied to the coil 51, the attractive force Q1 becomes smaller, and when it becomes smaller than the spring load Q2, the movable iron core 53 operates and the contact opens as shown in FIG. 9. Next, when the current is cut off, the attractive force Q1 returns to the non-excited state and becomes larger than the spring load Q2, so the movable iron core 53 returns to the state shown in FIG. 8.

However, this relay had the following drawbacks. That is, (1) Since this relay does not operate only with the contact pressure spring 68 during excitation, it is necessary to provide the bias spring 55 to facilitate the operation of the movable iron core 53. Therefore, not only the number of parts increases, but also variations in the load due to the bias spring 55 are added, resulting in large variations in operation.

(2) When current is passed through the coil 51, the magnetic flux of the permanent magnet 58 is canceled out, so the attractive force Q1 decreases, and when the magnetic flux of the coil 51 and the magnetic flux of the permanent magnet 58 become equal, the attractive force of the movable iron core 53 becomes O However, if we further increase the current through the coil,
This time, the coil magnetic flux becomes larger, and the attractive force increases again from 0. For this reason, the maximum working voltage cannot be increased,
There is no margin in the working voltage range.

[Purpose of the invention]

An object of the present invention is to provide a monostable polar solenoid that can reduce operational variations and increase the maximum operating voltage.

[Disclosure of the invention]

The present invention includes a coil, a fixed core disposed at one end of the coil, and a fixed core inserted into the coil from the other end so that the inner end faces the fixed core and the outer end has an axial direction. a movable core formed with a locking surface facing outward, and a movable core disposed on a side of the coil, one end of which is continuous with the fixed core, and the other end of which is opposite to the side of the movable core. a first yoke that attracts the movable iron core to the fixed iron core by energizing the movable iron core; a second yoke that has one end facing the locking surface of the movable iron core;
a permanent magnet that is interposed between the yokes and forms different magnetic poles on the first and second yokes to attract the locking surface of the movable core to the one end of the second yoke. It is something that

According to this invention, when the coil is energized, the movable iron core is attracted to the fixed iron core using the first yoke as a magnetic path, and when the coil is not energized, the first yoke and the second yoke are polarized by a permanent magnet and are movable. Since the iron core is attracted to the second yoke side, monostable operation is obtained. Furthermore, a bias spring is not required, which reduces the number of parts, eliminates operational variations, and improves operational reliability. In addition, the maximum working voltage of the coil can be increased, the holding force of the movable core during excitation can be increased, and impact resistance is improved.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. That is, in FIGS. 1 and 4, 1 is a coil frame around which a coil 2 is wound, 3 is a movable core, 4 is a fixed core, 5.6 is a permanent magnet, 7 is a first yoke, and 8 is a first yoke. This is the second yoke. The first yoke 7 is approximately U-shaped and is disposed on the side of the coil 2, with a fixed iron core 4 attached to one end 7a.
A mounting hole 9a for caulking is formed, and a notch 9b through which the movable iron core 3 passes is formed at the other end 7b. The fixed iron core 4 is fixed to the mounting hole 9a, and inserted into the hole 1d of the coil frame 1 from one end. Further, the movable core 3 is inserted from the other end of the hole 1d of the coil frame 1, and the inner end thereof faces the fixed core 4. This movable iron core 3 is provided with a drive rod 3a on the outer end side, and the end surface of the root portion of the drive rod 3a is a locking surface 3b facing in the axial direction. Therefore, when coil 2 is excited by energizing coil 2, the third
As shown in the figure, the movable core 3. An excitation magnetic path A is formed using the fixed iron core 4 and the first yoke 7 as a path. C is a gap between the movable iron core 3 and the fixed iron core 4, and becomes a gap of the excitation magnetic path A. The second yoke 8 has an abbreviated shape and is arranged on the opposite side of the first yoke 7 on the side of the coil 2, and one end 8a on the bent side forms a through hole 8b that passes through the drive rod 3a. , one end 8a faces the locking surface 3b by passing the drive rod 3a through the through hole 8b. In this case, the other end 7b of the first yoke 7 is engaged with the flange 1a of the coil frame 1, and the one end 8a of the second yoke 8 is engaged with the flange 1a of the coil frame 1.
It is positioned by engaging with the groove IC formed in the side plate 1b of. The permanent magnets 5 and 6 are each magnetized in the width direction and
is arranged between the sides of the yoke 7 and the second yoke 8, and the first
The yoke 7 and the second yoke 8 are polarized to have different magnetic poles. Therefore, when not energized, the second yoke 8 as shown in FIG.
．． A magnetic path B for non-excitation is formed with the permanent magnets 5, 6, the first yoke 7, and the movable iron core 3 as a path. D is a gap between the locking surface 3b of the movable iron core 3 and one end portion 8a of the second yoke 8, and becomes a gap of the non-excitation magnetic path B.

FIG. 3 shows a non-excited state, and since the magnetic flux from the permanent magnet 5.6 passes through the non-excited magnetic path B, the locking surface 3b of the movable iron core 3
is attracted to and held by one end 8a of the opposing second yoke 8. When the coil 2 is energized in this state, the magnetic flux from the coil 2 passes through the excitation magnetic path A, and the magnetic flux from the permanent magnet 5.6 passing through the movable core 3 is opposite to and larger than that, so the movable core 3 is fixed. It is attracted to the iron core 4, and the first
The result will be as shown in Fig. 2 and Fig. 2. Therefore, when energized, the movable iron core 3 moves upward in the figure, and when not energized, the movable iron core 3
moves downward and enters the return state, making it possible to realize monostable operation.

5 and 6 show this monostable polar solenoid applied to a normally closed relay, in which a movable frame 10 is provided at one end of the movable iron core 3, a movable contact 11 is inserted into the movable frame 10,
The movable contact 11 is biased by a contact pressure spring 12, and movable contacts 13.14 are provided at both ends of the movable contact 11, and a fixed contact 17 has a fixed contact 15.16 facing the movable contact 13.14. .18 is placed.

5 shows the non-excited state, FIG. 6 shows the energized state, and FIG. 7 shows the relationship between the spring load and the attractive force. Q4 is the non-excitation attraction force, Q5 is the spring load due to the contact pressure spring 12, and Q6 is the excitation attraction force. In the non-excitation mode shown in Fig. 5, the attraction force Q4 and the spring load Q are larger, so the state shown in Fig. 5 is maintained and the contact 1
It becomes stable when 3.15 and 14°16 are closed. Also, during the excitation shown in Fig. 6, the attractive force Q4 becomes smaller.
When the spring load becomes smaller than Q5, the movable core 3 operates and the contacts 13.degree. 15 and 14.16 open, resulting in the state shown in FIG.

If the current to the coil 2 is cut off in this state, monostable operation returns to the state shown in FIG. 5, resulting in a monostable operation.

〔Effect of the invention〕

According to this invention, when the coil is energized, the movable iron core is attracted to the fixed iron core using the first yoke as a magnetic path, and when the coil is not energized, the first yoke and the second yoke are polarized by a permanent magnet, and the movable iron core is Since it is attracted to the second yoke side, monostable operation is obtained. Furthermore, a bias spring is not required, which reduces the number of parts, eliminates operational variations, and improves operational reliability. Furthermore, the maximum working voltage of the coil can be increased, the holding force of the movable core during excitation can be increased, and impact resistance can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an excitation state of an embodiment of the present invention;
The figure is a cross-sectional view taken along line nn, and Figure 3 is a cross-sectional view of the excited state.
Fig. 4 is an exploded perspective view of the relay, Fig. 5 is a sectional view of the closed state applied to the relay, Fig. 6 is a sectional view of the open state, and Fig. 7 is a sectional view of the relay in its closed state.
The figure shows the spring load. Attraction force characteristic diagram, Fig. 8 is a sectional view of the relay in the closed state to which the conventional example is applied, Fig. 9 is a sectional view of the relay in the open state, and Fig. 10 is a sectional view of the relay in the closed state.
The figure shows the spring load and suction force characteristics. 2... Coil, 3... Movable iron core, 4... Fixed iron core, 5° 6... Permanent magnet, 7... First yoke, 8...
...Second yoke jI2 Fig. 78 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] A coil, a fixed core disposed at one end of the coil, and a fixed core inserted from the other end of the coil so that an inner end faces the fixed core and an outer end faces outward in the axial direction. a movable core having a locking surface formed thereon; and a movable core disposed on a side of the coil, one end being continuous with the fixed core and the other end facing the side of the movable core to excite the coil. The first
a second yoke having one end facing the locking surface of the movable iron core; and a second yoke interposed between the first and second yokes to provide different magnetic poles to the first and second yokes. By forming the locking surface of the movable iron core on the second
A monostable polarized solenoid comprising a permanent magnet attracted to the one end of the yoke.