JPS6311733B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tri-stable relay.

Conventional examples are shown in FIGS. 1 to 4. That is, the one in Fig. 1 is a hinge type and flexure type, in which armature C is swingably attached to the upper end of U-shaped yoke B installed on base A, and armature C and yoke B are connected to each other. An iron core D is arranged between the intermediate parts and a coil E is wound thereon, a movable contact F is provided at the tip of the armature C, first and second fixed contacts G and H are provided on the base A, and armature C and yoke B are provided. A return spring I is provided between the The first operation is performed by the return spring I when the coil is not energized.
The movable contact F contacts the fixed contact G, and is attracted to the iron core D from the armature C by the coil excitation, and contacts the second fixed contact H.

The ones shown in Figures 2 to 4 are of the balanced armature type and lift-off type.
A coil 2 is wound around the middle part of a letter-shaped yoke 1, and this is installed on a body block 3. U-shaped yoke 1
A stainless steel (non-magnetic) residual plate 4 is spot-welded to one side of both ends of the plate 4 with its anti-warp piece 4a. Further, a mounting plate 6 having a shaft 5 is attached to the yoke 1 so as to be supported thereon, and a center hole 8 of an armature device 7 with a card is rotatably fitted onto the shaft 5. The armature device 7 includes two armatures 7', each of which has one end 7a wider than the other.
7'' facing in opposite directions, with alnico magnets 9, 9' having relatively large residual magnetic flux density and generating magnetic poles in the opposite direction of the armatures 7', 7'' being interposed therebetween, and integrated with a resin block 10. A center hole 8 is formed in the center of this block 10, and cards (drive pieces) 10a and 10b are formed.

The body block 3 is equipped with coil terminals 12..., fixed contact plates 13..., and movable contact plates (contact springs) 14... that come into elastic contact with the cards 10a, 10b. Contact points 15 are provided facing each other.
The operation of this relay is such that when the coil 2 is de-energized, the alnico magnets 9 and 9' cause magnetic poles N and S to appear at both ends of the armatures 7' and 7'' of the armature device 7 as shown in the figure, and the yoke 1 The one wide end 7a facing both ends of the yoke 1 is attracted by the yoke 1 to form a magnetic circuit including the yoke 1, and the two movable contact plates 14... is pushed open to make the contact of that part open (normally open).Furthermore, when the coil 2 is energized, a magnetic pole by the coil 2 appears on the yoke 1, which is a magnetic pole N formed in the armature device 7. , S, the armature device 7 rotates in the opposite direction due to the repulsive force, restores the two movable contact plates 14, and opens the remaining two movable contact plates 14. .

However, all of these relays operate in such a way that the armature and yoke or core are attracted to each other by coil excitation, causing contact and collision. It's just guaranteed. For this reason, when controlling forward and reverse rotation of the DC motor M as shown in FIG. 5, it is possible with one relay, but as shown in FIG. The disadvantage is that it is impossible to operate with one relay; two relays are required. Note that N is a DC power supply.

Therefore, an object of the present invention is to provide a tri-stable relay that can control forward and reverse rotation of a motor with a neutral off function using one relay.

An embodiment of this invention is shown in FIGS. 7 to 13. That is, this three-stable relay is divided into a base block 16, a coil block 17, and an armature block 18. The base block 16 has terminals 19 protruding from the bottom surface of the box-shaped body, and fixed contact springs 20a from one opposite side of the top surface.
20d and movable contact springs 21a to 21d, each of which constitutes a fixed contact 22a and a contact portion.
22d and movable contacts 23a to 23d.

The coil block 17 is formed by laminating both vertical parts 17a and 17b of a U-shaped yoke 17' and connecting them to the horizontal part 17c with caulking rivets.The coil 24 is wound around the horizontal part 17c, and the vertical part 17a,1
A separator 25 is attached between the intermediate positions of 7b, and a shaft 26 is erected on the separator 25. and,
Opposing parts 27 and 28 at both ends of the yoke 17' located above the separator 25 are formed with protrusions 27b and 28b on one end side in the form of a plane hook with a predetermined width, and end parts 27a and 28a on the opposite side. They are diagonally opposite each other with 26 in the center.

The armature block 18 has a shaft hole 29 in the center of a long armature 18', permanent magnets 30, 30' with the same orientation at both ends, and cards 31, 31' on both sides. are doing.

For assembly, the coil 24 of the coil block 17 is fitted into the recess of the base block 16 and positioned, and the armature block 18 is rotatably supported on the shaft 26 of the coil block 17. In this state, the mutual relationship between the magnetic poles N and S of the armature block 18 and the opposing portions 27 and 28 of the yoke 17' is as follows. That is, the opposing portion 2 of the yoke 17'
When the armature block 18 faces the ends 27a and 28a in the width direction due to the diagonally opposed arrangement of the armature blocks 7 and 28 (see FIG. 12), the gap gap is at its minimum, and the gap rotates to the protrusions 27b and 28b. At the position (see FIG. 10), the gap distance is maximum, and in the middle part (see FIG. 8) it gradually changes from the minimum to the maximum. Further, the positional relationship between the cards 31, 31' and the movable contact springs 21a to 21d is such that the magnetic poles N, S of the armature block 18 are
(12th
Figure) When the movable contact springs 21b and 21c are pressed and rotated to face the protrusions 27b and 28b, the movable contact springs 21a and 21d are pushed, and when the movable contact springs 21a and 21d are in an intermediate position, they are separated from any of the movable contact springs 21a to 21d (neutral ).

The operating states of this three-stable relay are shown in FIGS. 8 to 13. That is, FIGS. 8 and 9 are non-excitation states. In this case, an attractive force is generated between the magnetic poles N and S at both ends of the armature block 18 and the opposed parts 27 and 28 of the coil block 17, and the armature block 18
It rotates to an intermediate position where the magnetic attraction force is balanced between both ends of the parts 7 and 28, that is, a magnetically neutral position, and then stops. On the other hand, since the cards 31 and 31' are in intermediate positions, they do not contact the movable contact springs 21a to 21d, and the movable contact springs 21a to 21d are connected to the fixed contacts 22a to 22d.
Since it is normally open with respect to 2d, it is electrically in a neutral off state.

In FIGS. 10 and 11, a current is passed through the coil 24 in one direction to excite it, and magnetic poles having the same polarity as the magnetic poles N and S of the armature block 18 are generated in the opposing parts 27 and 28 of the coil block 17. be. In this case, magnetic repulsion is generated and the armature block 18 is rotated in the direction of the protrusions 27b and 28b having a large gap gap, and the card 3
1 and 31' push the movable contact springs 21a and 21d to close the contacts.

12 and 13 show the coil 24 passing current in the other direction and the opposing parts 27 and 28 being excited in the opposite direction, and the magnetic poles N and S of the armature block 18 generate an attractive force at the end of the gap where the gap is small. It rotates toward parts 27a and 28a and stops. At this time, the movable contact springs 21b,
Press 21c to close the pole.

14 to 16 show a control circuit for a forward/reverse rotation motor using this relay. That is, in FIG. 14, a current is passed in one direction of the coil 24, the armature 18' is rotated in one direction, and the movable contact springs 21a and 21d are pushed, thereby applying DC power N to one side of the motor M to drive the motor M in the normal rotation direction. state, first
Figure 5 shows the card 31, with the coil 24 de-energized.
Since the contact point 31' is separated from the movable contact springs 21a to 21d, it is in an open state, that is, a state in which the motor M is stopped. Figure 16 shows a reverse drive by applying DC power N to the motor M in the opposite direction by passing current through the coil 24 in the opposite direction and rotating the armature 18' in the other direction and pushing the opposing movable contact springs 21b and 21c. state.

With this configuration, this three-stable relay has the following effects. That is, (1) A tri-stable relay with neutral can be provided, and forward/reverse control with normal off of the motor can be achieved with one relay.

(2) Since the armature 18' and yoke 17' do not come into contact or collide due to magnetic force, there may be poor contact or deterioration of suction force characteristics due to dirt entering the contact area, or contact due to grinding particles flying onto the contact points. It is possible to solve various problems such as defects, locking of contact parts due to chemical action of arc, contact/separation movement of contacts due to vibration, and noise sources due to collisions.

(3) The insulation between the coil part and the contact part can be improved (reduced capacitance).

(4) Since the opposing parts 27 and 28 face each other in the longitudinal direction of the armature block 18, and only the contact structure can be provided on the side (rotation direction side), the contact point for miniaturization of the tri-stable relay Space can be secured and a long span can be taken.

Note that the following modifications of this embodiment are possible. That is, armature block 1
There is no reason why a pair of magnets must be attached to both ends of the magnet 8, and one magnet may be attached in the middle or on the shaft. The yoke 17' of the coil block 17 may be integral. Moreover, it does not have to be a laminated product of thin plates. Further, the positional relationship between the movable contacts 23a to 23d and the fixed contacts 22a to 22d, the card shape, the lift-off type, or the flexure type can be freely selected, and the coil 24 may naturally have two windings.

If it is necessary to position (stopper) the armature block 18, a pin can be provided at an appropriate position in consideration of the vibration damping effect. No matter where this type of stopper pin is installed, the magnetic gap between the armature 18' and the yoke 17' remains the same.

As mentioned above, the tri-stable relay of this invention is
A polarized armature whose central part is supported pivotably and has opposite magnetic poles at both ends; The armature has a protrusion in the direction approaching the magnetic pole on one end side of the opposing part in the direction, and the armature has a gap distance between the protrusion and the magnetic pole when the armature is closest to the protrusion. a yoke configured to be larger than the gap distance with the magnetic pole when closest to the end opposite to the protrusion of the part; and a yoke wound around the intermediate part of the yoke to excite the yoke. The coil is disposed on both sides of both ends of the armature, and the armature is turned off when both ends of the armature are located at an intermediate portion between the protrusion and the opposite end thereof, due to two-way movement of the armature. Equipped with multiple contact points that turn on one pair at a time,
It has the following effects.

That is, according to the above configuration, tri-stable operation with neutral-off is possible, and forward/reverse rotation control with neutral-off of the motor can be realized with one relay. In addition, since the armature operates without contact with the yoke, there are disadvantages caused by the armature coming into contact with the yoke, such as poor contact and deterioration of suction force characteristics due to dirt entering the contact area, and wear powder scattering on the contact surface. It is possible to solve various problems such as poor contact, locking of the contact part due to the chemical action of arc, contact/separation movement of the contact due to vibration, and noise sources due to collision.

[Brief explanation of the drawing]

Figure 1 is a side view of a hinge type relay, Figure 2 is a schematic plan view of a balanced armature type relay, and Figure 3 is a schematic plan view of a balanced armature type relay.
FIG. 4 is an exploded perspective view of the relay, FIG. 5 and FIG. 6 are motor drive circuit diagrams using these relays, and FIG. 7 is an exploded perspective view of an embodiment of the present invention. , FIG. 8 is a schematic plan view in a magnetically neutral state, FIG. 9 is a side view thereof, FIG. 10 is a schematic plan view in a state where the coil is excited in one direction, FIG. 11 is a side view thereof, and FIG. 12 is a schematic plan view thereof. A schematic plan view of the coil excited in the other direction, FIG. 13 is a side view, and FIG.
4 to 16 are motor drive circuit diagrams using this relay. 17'... Yoke, 18'... Armature, 22a
~22d...Fixed contact constituting the contact portion, 23a~
23d...Movable contact constituting a contact part, 24...Coil, 27, 28...Opposing part, 27a, 28a...End part, 27b, 28b...Protrusion part.

Claims (1)

[Claims] 1. A polarized armature whose central portion is pivotally supported and has opposite magnetic poles at both ends, and a U-shaped armature whose opposite ends face the magnetic poles of the armature and whose rotation direction The armature has a protrusion in the direction approaching the magnetic pole on one end side of the opposing part in the same direction, and the armature has a gap distance between the protrusion and the magnetic pole when the armature is closest to the protrusion. A yoke configured to be larger than the gap distance between the magnetic pole and the magnetic pole when it is closest to the end opposite to the protrusion of the opposing part; coils are disposed on both sides of both ends of the armature, and are turned off when both ends of the armature are located intermediate between the protrusion and the opposite end, and the armature moves in two directions. A three-stable relay with multiple contact parts that are turned on one pair at a time.