JPH0120754Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a double-acting relay device that switches the output to a motor such as a servo motor between forward and reverse rotation.

``Prior art'' A conventional device of this type has a first
When the switch 2 is connected to the terminal on the first relay 1 side and current is applied from the second power supply 18, the relay is moved by the magnetic force generated in the coil 4 of the relay. Piece 5 is adsorbed,
When this movable piece 5 and the second contact 7 are connected, the first
The current from the power source 8 flows in the A direction. In this case, the movable piece 75 on the second relay 11 side is connected to the third contact 9 by a spring (not shown). Next, switch 2 is connected to terminal 13 on the second relay 11 side.
, the current from the second power supply 18 excites the coil 14 of the second relay 11 via the terminal 13, connects the movable piece 15 to the fourth contact 10, and connects the
The current from the power source 8 is switched between positive and negative by changing the voltage applied to the motor M by switching the switch 2. Note that it goes without saying that the first power source 8 and the second power source 18 may be the same. Therefore, when switch 2 is set to neutral, the first and second
Relays 1 and 11 are both turned OFF with respect to second and fourth terminals 7 and 10, and the terminals of the motor are at the same potential and do not rotate (FIG. 7). In this way, the motor M stops, rotates forward, or rotates reversely depending on the energization state of the terminals 3 and 13 connected to the respective relays.

``Problem that the invention aims to solve'' Conventionally, a circuit using two relays was required to switch the flow of current to rotate the motor forward, reverse, and stop, which inevitably resulted in a loss of component parts. As the number of devices increases, they become large, require a large installation space, and have the disadvantage that assembly work requires time.

The present invention was devised in view of the drawbacks of the conventional technology, and it uses one magnetic circuit to operate two independently moving electric switches, thereby reducing the number of components. In a pair of independent electrical switches, each of which has two pairs of fixed contacts and a pair of movable pieces having movable contacts that alternately connect and separate from the fixed contacts, two wires are connected around the iron core. There is a magnetic circuit in which two coils are wound in opposite directions so that magnetic fields in opposite directions are created when each coil is energized, and a pair of magnetic poles on both sides of this magnetic circuit are positioned in opposite directions. It is characterized by comprising a permanent magnet, and the permanent magnet is engaged with each of the movable pieces.

"Effect" By winding two coils around the iron core in opposite directions, when each coil is energized, magnetic fields in opposite directions are generated in this single magnetic circuit, and as a result, the magnetic poles facing each other are reversed. The pair of permanent magnets attached to the magnetic circuit can be very easily brought into contact with each other by attraction or repulsion.

``Embodiment'' To explain an embodiment of the present invention with reference to the drawings, a winding 24 consisting of coils 22 and 23 is wound around the outer periphery of an iron core 21 made of a magnetic material, and magnetic pole plates 25 and 26 are attached to both upper and lower ends of this iron core 21. One attached magnetic circuit 27 is formed. A pair of permanent magnets 30 and 31 are placed on both sides of this magnetic circuit 27, respectively, and the permanent magnets 30 and 31 approach and separate from each other at both ends of the magnetic pole plates 25 and 26.
The movable pieces 33, 3 engaged with the respective movable pieces 33, 3
4 has elasticity as a whole, and its base ends are attached to attachment terminals 35 and 36, respectively. A motor M is connected in the middle of a wire 37 connecting the mounting terminals 35 and 36. Also, movable pieces 33, 34
Movable contacts 40 and 41 are attached to the tips of the respective movable contacts 40 and 41, forming first and second fixed contacts 45 and 46 and third and fourth fixed contacts 47 and 48, which are paired with the respective movable contacts 40 and 41. The first and fourth fixed contacts 45 and 48 are connected by a U-shaped plate 50, and the second and third fixed contacts 46 and 47 are connected by another solid-shaped plate 51. , 51 are connected to a power source 53.

As shown in FIG. 3, the winding 24 is constructed by winding the first and second coils 22 and 23 around the iron core 21 in reverse windings, inside and outside, or alternately in double-wound manner. A pair of fixed contacts 4, the polarities of which are generated in the magnetic pole plates 25 and 26 connected to both ends of the iron core 21 are opposite to each other when the second coil 22 is energized and when the second coil 23 is energized.
5, 46, 47, 48 and a pair of movable pieces 33, 34 having movable contacts 40, 41 form electric switches 55, 56, respectively.

Next, to explain the operation of this embodiment, first, when neither the first nor second coils 22, 23 are energized, both magnetic pole plates of the magnetic circuit 27
5 and 26, and therefore, each permanent magnet 30, 31 connects each magnetic pole plate 25, 26 to the iron core 21 by its own magnetic force.
They remain adsorbed to each other (Figure 4). Therefore, both sides of the motor M have the same potential and are stopped without rotating.

Next, when one coil 22 is energized, a magnetic field is generated in the magnetic circuit 27, and as shown in FIG. 5, one magnetic pole plate 25 has an N pole and the other magnetic pole plate 26 has an S pole. As a result, the other permanent magnet 31 having the same magnetic pole is repelled by the magnetic force and retreats, and the one movable piece 3 that engages with this permanent magnet
The movable contact 41 located at the tip of the fourth fixed contact 4
Connect to 8. Moreover, the magnetic pole plate 2 of this magnetic circuit 27
5, 26 magnetic poles N, S and opposite magnetic poles S, N
One permanent magnet 30 having a
6, the second contact 46 and the movable contact 4
As a result, as shown in FIG. 5, the current to the motor M flows in the direction of the arrow X, causing the motor M to rotate in the normal direction.

Next, when the other coil 23 is energized, the magnetic pole plates 25 and 26 of the magnetic circuit 27 have opposite magnetic poles S,
N occurs, and as a result, the other permanent magnet 31 is now connected to the magnetic pole plates 25 and 26, so that the movable contact 41 is connected to the third fixed contact 47, and furthermore, the magnetic pole of one permanent magnet 30 is connected to this magnetic pole plate 25, 26. Magnetic pole plate 25, 2
Since the magnetic poles S and N of 6 are the same, the permanent magnet 30
The movable contact 40 is connected to the first fixed contact 45, and current flows through the motor M in the direction of arrow Y in FIG. 6, causing the motor to reverse. By making the core of one magnetic circuit common in this way, it is possible to configure a double-acting relay that performs complex operations.

"Effects of the invention" The invention as described above has the following effects.

One magnetic circuit was constructed by winding two coils around an iron core so that magnetic fields were generated in opposite directions. By alternately energizing the coils, the magnetic poles of the magnetic circuit could be changed, thereby permanently By attracting or repelling magnets, it is possible to create two electrical switches that each operate independently.

There is no need for two relays, and by using a common iron core, the number of parts can be reduced, and the size can be reduced, thereby saving space and reducing costs.

By grouping the fixed contacts together, external wiring can be simplified, assembly work can be facilitated, and handling can be made convenient.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially omitted perspective view of the main parts of the device, and FIG. 2 is a perspective view showing the relationship between a magnetic circuit and a pair of permanent magnets.
Fig. 3 is a perspective view showing the configuration of the winding, Fig. 4 is a circuit diagram of this device, Figs. 5 and 6 are circuit diagrams showing the operating states, and Fig. 7 is a circuit diagram showing a conventional relay device. It is. 21... Iron core, 22, 23... Coil, 27...
...Magnetic circuit, 30,31...Permanent magnet, 33,3
4...Movable piece, 55, 56...Electric switch.

Claims (1)

[Scope of utility model registration request] In a pair of independent electrical switches each having two pairs of fixed contacts and a pair of movable pieces each having a movable contact that alternately connects and separates from the fixed contacts, two pieces are installed around the iron core. There is a magnetic circuit in which two coils are wound in opposite directions so that magnetic fields in opposite directions are created when each coil is energized, and a pair of magnetic poles on both sides of this magnetic circuit are positioned in opposite directions. Consisting of a permanent magnet,
A double-acting relay device characterized in that the permanent magnet is engaged with each of the movable pieces.