JPS63258006A - Electromagnet device - Google Patents

Abstract

PURPOSE:To improve the magnetic efficiency of an electromagnet device of the type that an armature is inserted into the inner air core of a coil by forming the section of the armature inserted into the core of the coil in a tapered shape of increasing its sectional area remotely from the end. CONSTITUTION:A coil 1 having an inner air core 2, a yoke 4 disposed at its one end 4a in the core 2, an armature 5 supported at its base end 5d to the other end 4b of the yoke 4 in an angular displacing manner and so inserted into the core 2 as to separably contacted at the end 5e with one end 4a of the yoke 4, and a return spring 6 for resiliently pressing the armature 5 in a direction isolating from one end 4a of the yoke 4 are provided. In such an electromagnet device, the section 5b of the armature 5 inserted into the core 2 of the coil 1 is formed in a tapered shape of increasing its sectional area remotely from the end 5e. Thus, the magnetic efficiency can be improved without increasing the whole shape.

Description

[Detailed Description of the Invention] [Technical Field] The present invention is an electromagnetic device that angularly displaces an armature by energizing or demagnetizing a coil, and is particularly suitable for an electromagnetic relay by providing a movable contact on the armature. The present invention relates to an electromagnetic device used.

[Background Art] In electromagnet devices, especially those used in electrical insulators and relays, it is necessary to reduce the adjustment process of spring members such as movable contacts and to ensure sufficient contact pressure, etc. Increase is required. Also, for this reason, it is necessary to prevent the electromagnetic device from increasing in size. There is a need to improve the magnetic efficiency of ti magnet devices.

The applicant of the present application has proposed an electromagnet device as shown in Figs. 1 and 3 to meet such requirements (for example, Japanese Patent Application No.
6785). In other words, this electromagnet device includes a coil B having an inner cavity A, a yoke C having one end located in the inner cavity A of the coil, and a base end capable of being angularly displaced to the other end of the yoke C. An armature armature that is supported and inserted through the inner space A of the coil so that its tip comes into contact with and separates from one end of the yoke C, and a return force that biases the armature armature in a direction that moves the armature arm away from one end of the yoke C. It consists of spring E. In this case, one end of the yoke C that performs the all contact (suction release) operation and the tip of the armature are located within the inner space A of the coil, and furthermore, the yoke C is composed of one member. As a result, leakage magnetic flux was reduced, and therefore magnetic efficiency was significantly improved. However, in order to ensure the filling (attracting and releasing) operation of the armature, the cross-sectional area of the air core A of the coil is increased, and the ratio of the cross-sectional area of the armature to the inner cavity A becomes small. However, as these devices are made smaller, the magnetic resistance of the armature increases, and there is still room for improvement in improving magnetic efficiency.

[Object of the Invention] The present invention has been made in view of the above points, and its object is to improve the magnetic field in an electromagnetic device in which the armature is inserted through the inner cavity of a coil. The goal is to improve efficiency.

[Disclosure of the Invention] The electromagnet device of the present invention is an electromagnet device of a type in which an armature is inserted through the inner cavity of a coil. It is characterized by being formed in a tapered shape such that the cross-sectional area increases as it goes away from the tip.

According to the present invention, the cross-sectional area of the armature in the inner cavity of the coil and the ratio of the cross-sectional area of the armature to the inner cavity can be increased to reduce magnetic resistance, and the portion where the cross-sectional area of the armature is increased is Since it is located near the proximal end, the increase in equivalent mass is extremely small, thereby improving magnetic efficiency without increasing the overall shape.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

Reference numeral 1 denotes a coil having an inner cavity 2 having a rectangular cross section, and is wound around a coil frame 3. The inner space 2 in this embodiment is formed by the inner wall of the body of the coil frame 3 around which the coil 1 is wound, but the coil frame 3 may be omitted and the inner space 2 may be formed by the inner wall of the coil l. .

4 is a yoke made of a magnetic plate disposed around the coil 1, and is formed in a U-shape consisting of one end (short piece) 4a, the other end (long piece) 4b, and a connecting piece (middle part) 4c, one end 4
a is located in the inner cavity 2 of the coil.

Reference numeral 5 designates an armature made of magnetic plate material, which is formed into a U-shape consisting of a short piece 5a, a long piece 5b, and a connecting piece 5C.
The proximal end 5d, which is the end of the yoke, is supported by the stepped part of the other end 4b of the yoke so that it can be angularly displaced, and the tip 5e, which is closer to the end than the middle part of the long piece 5b, comes into contact with and separates from the one end 4a of the yoke. The coil is inserted into the inner cavity 2 of the coil. Also, the inner cavity 2 of the coil
The part inserted into the tip 5, that is, the long piece 5b
It is formed in a tapered shape such that the cross-sectional area increases as it moves away from e. More specifically, when the tip 5e is in contact with the one end 4a of the yoke, the surface including the contact surface of the long piece 5b is approximately parallel to the axis of the coil 1, and the tip 5e is farthest from the one end 4a of the yoke. When the contact surface of the long piece 5b and the opposite side thereof are substantially parallel to the axis of the coil 1.

Reference numeral 6 denotes a plate-shaped return spring that biases the tip end 5e of the armature in a direction to move away from one end 4a of the yoke, and its base end is fixed to the other end 4b of the yoke.

In addition, electric TI1. In the case where the relay is used, when the spring force of the return spring 6 is strong enough from the movable contact, the armature 5 is supported by urging the tip 5e in the direction of contacting the -#4a of the yoke. It may be the main function.

FIG. 2 schematically shows an example in which the above-mentioned electromagnet device is applied to an electromagnetic relay. Case 11 has contact terminal 1
2.12 and coil terminal 13.13 are installed, case 1
A fixed contact 15 provided with a fixed contact 14 and a movable contact 17 provided with a movable contact 16 are accommodated in the electromagnet device 1 . This electromagnetic relay has a normally open contact configuration (coil l is in the demagnetized state and open state). 18 is a card that connects the tip 5e of the armature 5 of the electromagnet device and the tip of the movable contact 17. be.

(Operation) The solid lines in Figures 1 and 2 indicate the energized state of the coil 1 (contact open state), the broken lines in Figures 1 and 2 indicate the demagnetized state of the coil 1 (contact open state), and the It shows the flow state of magnetic flux when the coil 1 is in an excited state.

When the coil 1 is demagnetized, the spring force of the movable contactor 17 and the return spring 6 causes the armature 5 to be in the separated position indicated by the broken line in both figures, so that the contact is in an open state.

When the coil 1 is excited in this state, the magnetic flux φ is as follows: long piece 5b of the armature - tip 5e - gap → one end 4a of the yoke - series of connecting pieces 4C → other end 4b - base end 5d of the armature - short piece 5a flows from the continuous connecting piece 5C to the long piece 5b, so the tip end 5e of the armature is attracted to one end 4a of the yoke against the spring force of the movable contact 17 and the return spring 6, and the armature 5 is It is displaced to the contact position indicated by the solid line, and therefore the contact is in a closed state.

When the coil 1 is demagnetized again in this state, the movable contact 1
7 and the spring force of the return spring 6, the armature 5 is separated from the one end 4a of the yoke, and the armature 5 returns to the separated position indicated by the broken line in both figures, so that the contact is in an open state.

[Effects of the Invention] The electromagnet device of the present invention is an electromagnet device in which the armature is inserted through the inner space of the coil, and the part of the armature that is inserted into the inner space of the coil is Since it is tapered so that the cross-sectional area increases as it moves away from the tip, the cross-sectional area of the armature in the inner cavity of the coil and the ratio of the cross-sectional area of the armature to the inner cavity can be increased, increasing the magnetic resistance. Since the portion where the cross-sectional area of the armature is reduced and the cross-sectional area of the armature is increased is located near the proximal end, etc., the increase in mass is extremely small, thereby improving the magnetic efficiency without increasing the overall shape.

[Brief explanation of drawings]

1 (a), (b), and (c) show one embodiment of the present invention, (a) is a cross-sectional view, (b) is a plan view, (c) is a side view, The figure is a schematic diagram of an electromagnetic relay applied, and FIG. 3 is a schematic diagram of a conventional example. 1-coil, 2...inner space, 4-yoke, 4. a
- one end, 4b - other end, 5 - armature, 5d - base end, 5e - tip, 6 - return spring.

Claims (1)

[Claims] (1) A coil having an inner cavity, a yoke having one end located in the inner cavity of the coil, a proximal end supported by the other end of the yoke so as to be angularly displaceable, and a distal end disposed in the inner cavity of the coil. An electromagnetic device comprising an armature that is inserted through the inner space of the coil so as to come into contact with and separate from one end of the yoke, and a return spring that biases the armature in a direction to move the armature away from the one end of the yoke. In the electromagnet device, the portion of the armature that is inserted into the inner cavity of the coil is formed in a tapered shape such that the cross-sectional area increases as the distance from the tip portion increases.