JPS6245411Y2 - - Google Patents

Description

[Detailed explanation of the idea] B Field of invention The present invention relates to a monostable polarized relay.

B. Prior art and its problems Polarized relays that use permanent magnets in their movable pieces are usually constructed as bistable types. If you configure a monostable relay by using most of the parts and assembly structure of this bistable polarized relay and making only some parts separate, you can create a separate monostable relay. It is more advantageous in manufacturing than manufacturing and can reduce production costs. For this reason, monostable type polarized relays have been manufactured, but conventional relays of this type require separate parts and are not necessarily advantageous in manufacturing, especially compared to bistable type polarized relays of the same type. The drawback was that the sensitivity was low. This point will be explained using FIG.

Figure 1A is a perspective view of the stator of a bistable polarized relay.One end of the yoke Y is divided into two wings Y1 and Y2, which sandwich one end P of the iron core C from both sides, and the magnetic pole P of the iron core and the yoke As shown in FIG. 1B, movable magnetic pole pieces P1 and P2 are positioned between the two wings.
These magnetic pole pieces P1 and P2 sandwich a permanent magnet m, and the three pieces together constitute a movable piece. When the coil L is not energized, either of the magnetic pole pieces P1 and P2 of the movable piece is connected to the magnetic pole P of the stator core.
The other pole piece is in contact with one wing of the yoke, for example, in the position shown in FIG. 1B. In Fig. 1B, when a current is applied to the coil L in a direction such that the magnetic pole P becomes the N pole, the movable piece is repelled by the stator and moves to the left, and even after the current is cut off, the permanent magnet remains unchanged. Due to magnetic force, the magnetic pole piece p1 becomes the magnetic pole P
, and p2 stops at a position in contact with the left wing Y2 of the yoke, exhibiting bistable characteristics. To make this structure monostable, a spring is used to apply a return force to the movable piece, for example, to the right as shown in Figure 1B, and this return force causes the permanent magnet to move the movable piece to the left. Make it larger than the holding force required to keep it in a stable position after moving. For this reason, in the past, one of the magnetic pole pieces p2 of the movable piece was made smaller in area than p1, as shown in FIG. One of the magnetic shielding plates S1 and S2, for example S1
Methods such as making the material thicker were used. Figure 1C
With this structure, when the coil L is energized to move the movable piece from the stable position in the monostable characteristic shown in Fig. 1C to the operating position shown in Fig. 1D, the yoke is A considerable portion of the magnetic field lines toward the left wing do not pass through the magnetic pole piece P2 of the movable piece and flow directly to the left wing of the yoke, so the force with which the magnetic pole P repels the magnetic pole piece p2 decreases, and the magnetic field lines between the left wing of the yoke and the magnetic pole piece p2 ( The attractive force acting in the direction of the magnetic field lines becomes oblique, the attractive force component parallel to the surface of the magnetic pole piece p2 increases, and the effective attractive force between the left yoke and the magnetic pole piece p2 also decreases. Therefore, the excitation current of the coil L required to overcome the frictional force and spring force and drive the movable piece to the left increases, and the sensitivity of the relay decreases. The method of making one wing smaller has the same problem, and the expensive yoke part has to be made as a separate part, and the method of changing the thickness of the magnetic shielding plate does not cause any loss in terms of characteristics, but
Since the working gap of the movable piece is asymmetrical, it is necessary to shave off one side of the magnetic pole portion P of the stator core, which is disadvantageous in terms of manufacturing.

C. Purpose The present invention aims to eliminate the above-mentioned drawbacks of conventional monostable polarized relays and provide a monostable polarized relay with good sensitivity.

D. Configuration In the monostable polarized relay of the present invention, both magnetic pole pieces of the movable piece have the same area, and the surface of the movable single magnetic pole piece that is in contact with the yoke blade on the side that faces the yoke blade is removed in the thickness direction. A gap is formed between the magnetic pole piece and the yoke blade. This gap reduces the force that holds the movable piece of the permanent magnet in the operating position and achieves monostable characteristics.

E. Embodiment FIG. 2 shows an embodiment of the present invention. Since the basic configuration is the same as the conventional example shown in FIG. 1, only the main parts are shown. FIG. 2A shows the movable piece in the stable position, and FIG. 2B shows the movable piece in the operating position. P is the magnetic pole of the stator core, Y1, M2
are the two wings of the yoke that sandwich the magnetic pole P, m is the permanent magnet of the movable piece, and p1 and p2 are the two magnetic pole pieces of the movable piece. These magnetic pole pieces have the same area, and the area is approximately equal to the area where both wings Y1 and Y2 of the yoke face the stator magnetic pole P. In the operating position of the movable piece (Fig. 2B), the surface of the magnetic pole piece p2 that is in contact with the yoke blade Y2, which faces the blade Y2, is shaved and thinned, and a gap d is formed between p2 and Y2. ing. Because of this gap d, the magnetic resistance in the part where the magnetic flux generated by the permanent magnet m flows from the magnetic pole piece p2 to the wing piece Y2 is large, and the attractive force between p2 and Y2 is due to the fact that p2 and Y2 are in close contact with each other. Therefore, the force of holding the movable piece in the operating position by the permanent magnet is reduced, and is overcome by the spring force (not shown), achieving monostability. In the stable position shown in FIG. 2A, when current is applied to the coil L so that the north pole appears on the magnetic pole P, all the lines of magnetic force from the magnetic pole P toward the yoke wing piece Y2 pass through the magnetic pole piece p2, and the magnetic pole P
Since both the repulsive force of the wing and the attractive force of the wing piece Y2 are perpendicular to the pole piece p2 and are 100% effective, exactly the same operating force as in the case of the bistable poled relay shown in FIG. 2B is generated.

F. Effect The monostable polarized relay of the present invention has the above-described configuration, and only the holding force during operation can be reduced without reducing the operating force. Therefore, a monostable polarized relay without a decrease in sensitivity can be obtained, and Only one pole piece of the movable piece is a separate part, and there are no other extra machining or assembly/adjustment steps, and it is possible to run it on the same production line as the bistable type, which is advantageous in terms of manufacturing.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example, where A is a perspective view of the stator core, B is a plan view of the bistable type, D is a plan view of the monostable type when it is in operation, and C is a plan view of the stable state.
Figure 2 shows an embodiment of the present invention, where A is stable;
B is a plan view showing the state in operation. C...Stator core, P...Stator magnetic pole, L...
Coil, m...Permanent magnet, p1, p2...Movable magnetic pole piece, Y1, Y2...Yoke wing piece.

Claims (1)

[Scope of utility model registration request] Both magnetic pole pieces of the movable piece have the same area, and the surface of the magnetic pole piece on the side that contacts the yoke blade during operation, which faces the same blade, is removed to make the same magnetic pole piece thinner, and when activated, the same magnetic pole piece and the above A monostable polarized relay with a gap formed between the wing pieces.