JPH01136312A - Electromagnet device - Google Patents

Abstract

PURPOSE:To buffer shocking energy when an armature hits a yoke in operation immediately before contact and to reduce noise in operation, by rubbing an elastic piece, which is provided at a fixed position, with a projection being provided at an armature. CONSTITUTION:A projection 4f is provided at the tip of one movable piece 4b of an armature 4. The projection 4f rubs an auxiliary spring 8 as an elastic piece when the angle of the armature 4 is displaced. The spring 8 is attached to a fixed position 9 such as the base stage of an electromagnet device 1. The armature 4 is buffered by the rubbing contact between the projection 4f and the auxiliary spring 8. The impact energy is lost, the impacting sound is decreased and noise is lowered.

Description

TECHNICAL FIELD The present invention relates to an electromagnet device suitably implemented in an electromagnetic relay such as a latching relay.

BACKGROUND ART FIG. 7 is a perspective view showing the structure of an electromagnetic relay 1a using an electromagnet device 1 according to the prior art. The main component of the electromagnet device F1 is a yoke 3 around which an electromagnetic coil 2 is wound.
, an armature 4 supported so as to be angularly displaceable about an axis indicated by reference numeral S, and a card member 5 that transmits displacement of the armature 4 to a movable contact member 6; and one end supported by a support member 6b. , a movable contact member 6 to which a spring force is applied, and a fixed contact member 7 disposed opposite to the movable contact member 6.
An electromagnetic relay 1a is formed. A pair of opposing movable contacts 6a and fixed contacts 7a are fixed near the tips of the movable contact member 6 and the fixed contact member 7, respectively.

The armature 4 includes a bearing member 4C through which the axis S passes;
A pair of permanent magnet pieces 4d and 4e fixed to both ends of the bearing member 4C, and a pair of movable pieces 4a and 4b sandwiching and integrally fixing the bearing member 4C and the permanent magnet pieces 4d and 4e. The movable piece 4 is formed into a roughly H-shape.
At both ends of the yoke 3, the opposing inner surfaces are connected to the magnetic pole 3a of the yoke 3 during operation, as will be described later.
.

Each pair of contact surfaces Ta, Tc;'r alternately contact with 3b.
b, form 'rct. Contact surface Ta, Tc; Tb,
Both Td are magnetized to correspond to the magnetic poles of the permanent magnet pieces 4d and 4e.

As shown in FIG. 7, the contact surface Ta of the armature 4 contacts one magnetic pole 3a of the yoke 3, the contact surface Tc contacts the opposite magnetic pole 1 [i3b, and the movable contact 6a and fixed contact 7a is assumed to be in a reset state. When the electromagnetic coil 2 is energized and the yoke 3 is excited, the magnetic poles 3a and 3b of the yoke 3 and the contact surfaces Ta and Tc of the armature 4
Due to the mutual magnetic action, the contact surfaces Ta and Tc repel the magnetic poles 3a and 3b of the yoke 3, and the contact surfaces Tb and Td are attracted to the magnetic poles ff13a and 3b.

As a result, the armature 4 is angularly displaced in the direction shown by the arrow against the spring force of the movable contact member 6, and the contact surfaces Tb and Td
contact the magnetic poles 3a, 3b and are attracted, and even if the electromagnetic coil 2 is subsequently turned off, the magnetic force of the permanent magnet pieces 4d, 4e maintains the attracted position.Thereby, the movable contact 6a and the fixed contact 7all is conductive. This state is called a set state.

Next, when the excitation current is passed through the excitation coil 2 in the opposite direction,
The armature 4 is angularly displaced in the opposite direction, maintains its position even after the current is cut off, and returns to the reset state shown in Figure 7 again.

In this way, the 7th rf! The electromagnetic relay 1a shown in I functions as a so-called latching relay that performs a set-reset operation by changing the direction of excitation current to the yoke 3.

FIG. 8 is a graph showing the operating characteristics of the prior art electromagnetic relay 1 shown in FIG. This will be explained with reference to the seventh diagram. The horizontal axis represents the amount of displacement X of the armature 4 from one side to the other, so-called stroke, and the vertical axis represents the attraction force F.

It is assumed that armature 4 is now in the reset state position,
When an excitation current is supplied to the electromagnetic coil 2 in the set direction, the attractive force F moves from point A to point B, overcomes the spring force of the movable contact member 6, and the armature 4 is angled around the axis S in the direction of the arrow. The armature 4 is displaced, the contact surfaces Ta and Tc of the armature 4 are separated, and the attraction force F increases along the line 11 and moves to the 8th IC point.

This indicates that the electromagnetic relay 1 has changed from the reset state to the set state, and the movable contact 6a and the fixed contact 7a are electrically connected.The contact surfaces Tb and Td of the armature 4 are in contact with the magnets 1+3a and 3b of the yoke 3. It will be attracted, but at this time it will make a collision sound.

After entering the set state, when the set excitation current is cut off,
The attractive force F depends only on the permanent magnets 4d and 4e, and moves to point D. When a reset excitation current is applied in the opposite direction to the 0th order set excitation current that maintains the attracted state, the attractive force increases. F falls to point G and then follows the direction indicated by line 12 to reach the reset state at point H. At this time, as in the set state, a collision sound is emitted. Here, the force f1 between points D and G in FIG. 8 represents the holding force in the set state, and similarly, the force between points A and B represents the holding force f2 in the reset state.

Line 14 drawn between line 11° and line 12
represents the attractive force of only the permanent magnets 4d and 4e in the non-excited state, and the polygonal line 13 represents the change in the spring force of the movable contact member 6 due to the angular displacement of the armature 4. The movable contact 6a and the fixed contact 7a are electrically connected.

Similarly, at one point, the movable contact 6a and the fixed contact 7a are separated and cut off.

In the electromagnetic device 1 according to the prior art, when the armature 4 comes into contact with the end faces of the magnetic poles 3a, 3b of the yoke 3, a collision sound is generated. Therefore, an electromagnetic relay 1a using this
However, when installed in home appliances, automobiles, etc., the impact noise becomes extremely undesirable. Accordingly, various proposals have been made to reduce this collision noise, including the insertion of an elastic body or a regular plate between the armature 4 and the yoke 3. In such a method, a magnetic gap is created between the yoke 3 and the armature 4, resulting in problems such as a decrease in attractive force and a decrease in the amount of displacement of the armature 4.6 Purpose Therefore, the purpose of the present invention is to solve the above-mentioned technical problem. It is an object of the present invention to provide an electromagnet device which solves the problems and reduces impact noise when an armature makes contact without reducing either the attraction force or the amount of displacement.

Embodiment FIG. 1 is a perspective view of an electromagnetic device according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. 71st in Figure 1 and 2rlJ! Parts corresponding to I are given the same reference numerals.The features of the present invention are that a protrusion 4f is provided at the tip of one movable piece 4b of the armature 4 (on the right side in FIG. 2), and is close to the protrusion 4f. Further, an auxiliary spring 8, which serves as an elastic piece that is inserted into contact when the armature 4f makes an angular displacement, is attached to a fixed position 9 such as a base (1 not shown) of the electromagnet device 1.

The auxiliary spring 8 does not contact the protrusion 4f in the position where the armature 4 is attracted to the stand 3, that is, in the set state and the reset state, and therefore does not apply a load to the armature 4. , as described later, amateur 4
During the angular displacement process, the protrusion 4f engages and springs the auxiliary spring 8 at least once, so it functions as a buffer.

FIG. 3(1) to FIG. 3(3) and FIG. 4 are plan views showing the operation of this embodiment. 3 and 4 are plan views of the armature 4 on the side where the protrusion 4f is provided, and portions corresponding to FIGS. 1 and 2 are given the same reference numerals.

FIG. 3(1) shows a situation in which the yoke 3 is excited and the armature 4 is angularly displaced from the reset state to the set state, that is, in the direction indicated by arrow R.

With the angular displacement of the armature 4, the movable piece 4 of the armature 4
The protrusion 4f provided on the b side contacts the auxiliary spring 8, and the auxiliary spring 8 receives a force f1 directed downward in FIG. 3(1).

FIG. 3 (2) shows a state in which the angular displacement of the armature 4 has progressed. The protrusion 4f further presses the auxiliary spring 8, the spring force of the auxiliary spring 8 becomes a load on the armature 4, and the armature 4 moves into the angular position. Force in the opposite direction to the displacement direction, i.e., Fig. 3 (2)
receives an upward repulsive force f2. Therefore, the armature 4 is buffered by this repulsive force f2. The projection 4f further transitions to the state shown in FIG. 3(3) while inserting the auxiliary spring 8 thereinto.

FIG. 3(3) shows a state in which the angular displacement has further progressed, the protrusion 4f is released from contact with the auxiliary spring 8, and one movable piece 4b of the armature 4 is in contact with one magnetic pole 3b of the yoke 3;
In other words, the armature 4 is in the set state.As mentioned above, the armature 4 is buffered by the engagement between the projection 4f and the auxiliary spring 8, and loses its collision energy. When the two come into contact, the collision noise as in the prior art is reduced, and a low-noise electromagnetic device is realized.

FIG. 4 shows, contrary to the above, the operation when moving from the set state to the reset state. In the transition from set to reset, the excitation direction of the yoke 3 is reversed, and the armature 4 arrow P
The armature 4 is angularly displaced in the direction shown by , and the protrusion 4f contacts the auxiliary spring 8 and presses it upward in FIG. 4, so the armature 4 produces a repulsive force directed downward in FIG. f
Receive 3 and get milled. Therefore, the collision noise caused by the contact between the armature 4 and the yoke 3 is also reduced during the transition to the reset state.

FIG. 5 is a diagram for explaining the operation of this embodiment based on a plan view of the armature 4 and the yoke 3.

Due to the angular displacement of the armature 4, the protrusion 4f moves on a circular arc C having a radius Ra centered on the axis S perpendicular to the plane of the drawing, and the auxiliary spring 8 is placed on the normal line to the circular arc C. If the protrusion 4f and the auxiliary spring 8 are arranged in this manner, at a point P1 where the protrusion 4f and the auxiliary spring 8 come into contact, the thickness d' where the tips of the two overlap will be maximum, and the armature 4 will be aligned with the imaginary line 1 from this point Pl.
No matter which direction it is displaced as shown by a, lb, the auxiliary spring 8 is deflected as shown by imaginary lines lc, 1d, and its tip moves on the arc E, following the above-mentioned shape. As the thickness d decreases, the protrusion 4f and the auxiliary spring 8 separate from each other at the point P2 or P3.

Therefore, the radius Ra to the tip of the protrusion 4f and the spring of the auxiliary spring b8 are adjusted so that the circumferential angle θ, which is the distance between the points Pi and P2 on the circumference C, is within the angular displacement amount of the armature 4, that is, within the stroke. Length k, thickness t of protrusion 4f, overlap thickness d
By setting the above, the operating characteristics shown in FIG. 6 can be obtained.

FIG. 6 is a graph showing the operating characteristics of this embodiment. This will be explained with reference to FIGS. 1 to 4. In FIG. 6, the horizontal axis represents the amount of displacement X of the armature 4 from one side (for example, reset state) to the other side (for example, set state);
This represents the so-called stroke, and the vertical axis represents the suction force F. Assume that the armature 4 is now in the reset state position, and when an excitation current is supplied to the electromagnetic coil 2 in the setting direction, the attractive force F moves from the α point to the β point.1. Due to the spring force of the movable contact member 6, the armature 4 is angularly displaced around the axis S shown in FIG. 1 in the direction of the arrow mark (in the direction of the arrow R in FIG. 3). The contact surfaces Ta and Tc of are separated from the magnetic pole 3a.

The suction force F increases along line 111 and moves to point γ in FIG. During this transition process, the protrusion 4f comes into contact with the auxiliary spring 8, as shown in FIG. 3(1). This point is point 9 in FIG. When passing one point, the auxiliary spring 8 is bent as shown in FIG. 3 (2), and the spring force of the auxiliary spring 8 is applied to the armature 4 as a load.The spring force acting on the armature 4 when set is line ff112. It rises along the graph shown by , and at the same time, the ** effect acts on armature 4.

Thereafter, the protrusion 4f and the auxiliary spring 8 separate from each other at six points. 6 points are amateur 4, as shown in Figure 3 (3).
At the point where the load of the auxiliary spring 8 on the
b and Td contact and are attracted, the electromagnet device 1 changes from the reset state to the set state, and the movable contact 6a and fixed contact 7a of the electromagnetic relay 1a are electrically connected. The attractive force F moves to point γ in FIG. 6, and the spring force moves to point ε. When the excitation to the electromagnetic coil 2 is cut off here, the attractive force decreases to point δ, which depends only on the permanent magnets 4d and 4e, and the attracted state is maintained.

At the time of resetting, which is the opposite of the above, when the excitation current is applied to the electromagnetic coil 2 in the opposite direction, the attractive force moves from the δ point to the ε point, and then the line 11, which is opposite to the operation at the time of setting, moves from the δ point to the ε point.
It descends along the graph of 3, and the reset operation ends at point ζ. The change in spring force during this period is shown by a polygonal line 114 that is substantially parallel to line 112. Note that line 1
A line 715 between line 11 and line 113 is a graph showing changes in attractive force in a non-excited state.

The collision sound is generally proportional to the force that acts when the yoke 3 and the armature 4 come into contact, and this force is the 61st! It corresponds deeply to the energy of the difference between the attraction force F and the spring load, which is shown by hatching l. Therefore, by reducing the difference between the suction force and the spring load, it is possible to reduce the collision noise when the armature 4 contacts the yoke 3. In the buffer period between point η and point ε in the part surrounded by line 111 and line l12 in FIG. The remarkable decrease in yoke 3 indicates the effect of this embodiment. In this embodiment, as mentioned above, after the set operation or reset operation, the armature 4 is completely attracted to the yoke 3. Sufficient suction force acts between the two, and problems such as a decrease in armature displacement and a drop in suction force due to the insertion of a cushioning material, as described in the background art section, are eliminated.

In the above-described embodiment, one protrusion 4f and one auxiliary spring 8 are disposed on the armature 4 and correspondingly one auxiliary spring 8 at the fixed position, but the number of the protrusion 4f and the auxiliary spring 8 facing each other is limited to one. For example, they may be arranged in pairs on both sides of the armature 4, thereby strengthening the buffering effect.

Further, in the above embodiment, an electromagnetic device capable of latching operation is described, which is equipped with permanent magnet pieces 4d and 4e, but the present invention is not limited to this, and can also be implemented in an electromagnetic device that does not include permanent magnet pieces. Needless to say.

Effects As described above, in the electromagnet device according to the present invention, at least one elastic piece is attached to a fixed position, and a protrusion is provided on at least one end of the armature, so that the electromagnetic device according to the present invention During the angular displacement process, the protrusion provided on the armature is inserted into the elastic piece provided at the fixed position at least once. As a result, the collision energy when the armature contacts the yoke during operation is absorbed by MtlL immediately before the contact, so noise during operation is reduced. Furthermore, when the yoke and the armature are in an attracted state, the auxiliary spring does not apply any load to the armature, so a decrease in magnetic attraction force is prevented, and an electromagnet device with improved efficiency and low noise is realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electromagnetic device according to an embodiment of the present invention, and FIG.
The figure is a plan view, FIGS. 3 and 4 are plan views showing the operation of this embodiment, FIG. 5 is a plan view for explaining the operation of this embodiment, and FIG. 6 is a plan view of the operation of this embodiment. FIG. 7 is a perspective view showing the structure of an electromagnetic device according to the prior art, and FIG. 8 is a graph showing its operation. 1... Electromagnet device, 1a... Electromagnetic relay, 2...
Electromagnetic coil, 3... Yoke, 3a, 3b... Yoke magnetic pole, 4... Armature, 4d, 4e... Permanent magnet piece, 4f... Protrusion, 5... Card member, 6... ... Movable contact member, 6a... Movable contact, 7... Fixed contact member, 7a... Fixed contact, 8... Auxiliary spring, S...
Axis Agent Patent Attorney Stroke Number Kei Part Figure 3 Figure 4 Figure 6 Procedural Amendment

Claims (1)

[Scope of Claims] An electromagnetic device comprising: a yoke around which an electromagnetic coil is wound; and an armature that is angularly displaced by excitation of the electromagnetic coil and comes into contact with or separates from the yoke. At least one elastic piece is attached to the fixed position, a projection is provided on at least one end of the armature, and the projection is provided on the armature at least once during the angular displacement process when the armature contacts or separates. An electromagnet device characterized in that the protrusion comes into frictional contact with an elastic piece provided at the fixed position.