JPH01246802A - Electromagnet apparatus - Google Patents

Abstract

PURPOSE:To increase attracting force of an electromagnet apparatus without enlarging the size of a coil, by setting a permanent magnet to make its attracting force direction the same as that of a coil to attract an armature by excitation in parallel to a closed magnetic circuit of the coil. CONSTITUTION:Of magnetic fluxes phi1, phi2 caused by a permanent magnet 9a, phi1 flows from the N-pole an auxiliary yoke 11, the free end 7, a magnetic pole 3, a yoke 5 and the S pole while phi2 flows from N-pole an auxiliary yoke 11, a free end 7 of an armature 8, a base end part 6 of the armature 8, a connecting part 4 of the yoke 5, and the S-pole, resp. When electricity is not conducted in a coil 2, the free end 7 is located in the position of the dotted line energized by a returning spring 13 and attracted to the direction parting from the magnetic pole 3 by the magnetic flux phi2. When electricity is conducted in the coil 2, magnetic flux phi3 flows from the free end 7 of the armature 8, magnetic pole 3 of the yoke 5, the connecting part 4 of the yoke 5, the connecting part 6 of the armature 8, and the free end 7, and the free end 7 is attracted to the magnetic pole 3. At the same time, the magnetic flux phi1 becomes a closed circuit and attracting force of the permanent magnet 9a is added thereto, thus, attracting force of an electromagnet apparatus is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnet device applied to an electromagnetic relay or the like.

[Conventional technology]

FIG. 9 shows a conventional example. That is, this electromagnetic device is
A coil 51 having an air core portion 50, and a connecting portion 53 having a magnetic pole portion 52 that enters the air core portion 50 from one end of the coil 51, and that goes around the outside of the coil 51 and is located on the opposite side from the one end. The yoke 54 has a base end 57 that is magnetically coupled to the connecting portion 53 of the yoke 54 and is rotatably supported. and an armature 56 facing the. 58 is a leaf spring that supports the armature 5G.

[Problem to be solved by the invention]

This electromagnetic device has an armature 56 by excitation of a coil 51.
Since the free end portion 55 of the magnetic pole portion 52 is attracted to the magnetic pole portion 52 within the air core portion 50, magnetic leakage is small, magnetic efficiency is high, and the attractive force is large.

However, for example, in electromagnetic relays, it is necessary to increase the attractive force of the armature in order to reduce the adjustment process of spring members such as movable contacts and to ensure sufficient contact pressure, but this has the disadvantage of increasing the size of the coil. there were.

Therefore, an object of the present invention is to provide an electromagnetic device that can increase the attractive force without increasing the size of the coil.

[Means to solve the problem]

The electromagnet device of the present invention includes a permanent magnet that attracts the armature in the same direction as the direction in which the armature is attracted by the excitation of the coil, and is provided in parallel with a closed magnetic path formed by the coil.

[Effect]

According to the configuration of the present invention, the magnetic flux generated by excitation of the coil does not pass through the permanent magnet, so the magnetic resistance is small.

Furthermore, the attractive force of the permanent magnet is added to the attractive force that attracts the free end of the armature to the magnetic pole part by the excitation of the coil, so that the attractive force increases. Therefore, the attraction force can be increased without increasing the size of the coil.

〔Example〕

A first embodiment of this invention will be described based on FIGS. 1 to 5. That is, this electromagnet device includes a coil 2 having an air core 1, and a coil 2 having an air core 1 from one end of the coil 2.
a yoke 5 having a magnetic pole part 3 extending therein, and a connecting part 4 which goes around the outside of the coil l and is positioned on the opposite side to the one end; An air core 1 having a freely supported proximal end 6
An armature 8 whose intermediate side face faces the magnetic pole part 3, and a free end 7 in which one pole S is magnetically coupled to the intermediate part of the yoke 5 and is in contact with the 11 part 3. The permanent magnet device 9 has the other pole N close to the pole N, and the free end 7 is attracted to the free end 7 of the armature 8 with a spring force greater than the attractive force of the permanent magnet device 9 that attracts the free end 7 of the armature 8 to the magnetic pole portion 3. A return spring 13 is provided to separate the magnetic pole portion 3 from the magnetic pole portion 3.

The coil 2 is wound around a coil frame 12 having a rectangular cross section,
The air core 1 is formed at the center of the coil frame 12, but the coil frame 12 may be omitted and the air core 1 may be formed from the inner wall of the coil 2.

The yoke 5 has a U-shape or three-shape in which one side is short and the other side is long, with the magnetic pole part 3 side being a short piece and the connecting part 4 side being a long piece, and the connecting part 4 is continuous via a step part 4a. ing. The yoke 5 is fixed to the coil frame 12.

The armature 8 has substantially the same shape as the yoke 5, with the base end 6 being a short piece and the free end 7 being a long piece. Further, the base end portion 6 is supported at the position of the step portion 4a of the connecting portion 4, and the connecting portion 4 between the base end portion 6 and the yoke 5 is connected by the return spring 13, whereby the armature 8 is The free end 7 becomes rotatable within the air core 1 between the solid line and the broken line in FIG. In addition, the free end portion 7 is biased in a direction away from the magnetic pole portion 3 by the return spring 13 . 14
is a card connection hole.

The permanent magnet bag N9 is a permanent magnet 9 in which a plate magnet is used as an example.
a and an auxiliary yoke 11. The permanent magnet 9a has one pole S in contact with the outer surface of the U-shaped intermediate portion of the yoke 5. The auxiliary yoke 11 is a flat plate, one end is fixed to the magnetic pole N of the permanent magnet 9a, the other end is formed with a recess 10, and the free end 7 passes through the recess 10. are doing.

The dimensions of the recess 10 are set so that when the free end 7 contacts the magnetic pole part 3, it contacts the permanent magnet 9a side of the recess 10, and when it is returned by the return spring 13, it contacts the opposite side of the recess 10.

The return spring 13 is a temporary spring, and has the function of connecting the yoke 5 and the armature 8.

4 and 5 show the magnetic flux Φ1. due to the permanent magnet 9a.
The flow of Φ2 and the flow of magnetic flux Φ3 due to coil 2 are shown. That is, the magnetic flux Φ1 is the other pole N− of the permanent magnet 9a.
Auxiliary yoke 11 - free end 7 - magnetic pole part 3 - yoke 5 - one pole S of permanent magnet 9a. The magnetic flux φ2 is the permanent magnet 9a
Other pole N - auxiliary yoke 11 -> free end 7 of armature 8 -> base end 6 of armature 8 - connecting part 4 of yoke 5 - permanent magnet 9a
becomes one pole S. The magnetic flux φ3 is generated at the free end 7 of the armature 8 →
The magnetic pole part 3 of the yoke 5 - the connection part 4 of the yoke 5 -> the connection part 6 of the armature 8 - the free end part 7.

In this electromagnet device, when the coil 2 is not energized, it is not energized and the free end portion 7 is separated from the magnetic pole portion 3 by the return spring 13, as shown by the broken line in FIG.

At this time, the magnetic flux Φ2 flows through the closed magnetic path, and the free end 7 is attracted in the direction in which it can be cut from the magnetic pole part 3 by the attractive force of the permanent magnet 9a.

When the coil 2 is energized, the magnetic flux Φ3 flows, which attracts the free end 7 to the magnetic pole part 3 against the attractive force of the return spring 13 and the permanent magnet 9a, and the magnetic flux Φ1 forms a closed magnetic path, causing the permanent magnet 9a to A suction force is applied, resulting in the state shown by the solid line in FIG.

When the coil 2 is de-energized, it returns to the non-excited state.

According to this embodiment, the magnetic flux caused by the excitation of the coil 2 does not pass through the permanent magnet 9a, so the magnetic resistance is small.Moreover, the excitation of the coil 2 creates an attractive force that attracts the free end 7 of the armature 8 to the magnetic pole part 3. The attraction force is increased due to the addition of the attraction force by the permanent magnet 9a. Therefore, the attraction force can be increased without increasing the size of the coil 2.

FIG. 6 shows an example in which this electromagnet device is applied to an electromagnetic relay. That is, 15 is a card connected to the connection hole 14 of the free end 7, 16 is a movable contact plate whose tip is connected to the card 15 and has a normally open movable contact 17 on the side surface of the middle part, and 18 is a movable contact. A fixed contact plate has a fixed contact 19 facing 17, 20 is a case, 21 is a coil terminal, and 22 is a contact terminal.

A second embodiment of the invention is shown in FIGS. 7 and 8.

That is, in the first embodiment, this electromagnet device has an extending piece 23 parallel to the free end 7 at the tip of the auxiliary yoke 11.
is formed so that the free end portion 7 and the extending piece 23 are attracted to each other when not energized. In this case, the contact area with the free end portion 7 can be adjusted by adjusting the bending angle of the extending piece 23.

In the above embodiment, the free end 7 is inserted into the recess 10, but there is no recess 10, and when the free end 7 comes into contact with the magnetic pole part 3, the free end 7 approaches the end of the auxiliary yoke 11. But that's fine. In this case, the attraction force in the same direction as the return direction by the return spring is not generated, and only the attraction force when the coil 2 is excited increases.

Further, the return spring 13 may be a movable contact plate or other spring.

Furthermore, the connecting part 4 may be located within the air core part 1.

〔Effect of the invention〕

According to the electromagnet device of the present invention, the magnetic flux generated by the excitation of the coil does not pass through the permanent magnet, so the magnetic resistance is small. Furthermore, the attraction force by the permanent magnet is added to the attraction force that attracts the free end of the armature to the magnetic pole part by the excitation of the coil, so that the attraction force increases. Therefore, there is an effect that the attraction force can be increased without increasing the size of the coil.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view, Fig. 4 is an explanatory diagram showing the flow of magnetic flux, and Fig. 5 is an illustration of the auxiliary yoke. An explanatory diagram showing the flow of magnetic flux, Fig. 6 is a schematic diagram showing an example applied to an electromagnetic relay, and Fig. 7 is a schematic diagram showing an example applied to an electromagnetic relay.
8 is a schematic diagram showing an example applied to an electromagnetic relay, and FIG. 9 is a sectional view of a conventional example. 1...Air core part, 2...Coil, 3...Magnetic pole part, 4
... Connecting portion, 5... Yoke, 6... Base end portion, 7...
... Free end, 8... Armature, 9... Permanent magnet, 1
0... recess, 11... auxiliary yoke

Claims (1)

[Claims] A coil having an air core, a yoke having a magnetic pole part that enters the air core from one end of the coil, and a connecting part that goes around the outside of the coil and is located on the opposite side of the one end; an armature having a base end that is magnetically coupled to the connecting part and rotatably supported, and a side surface of the middle part of the free end that penetrates the air core part faces the magnetic pole part, and an intermediate part of the yoke. a permanent magnet device having one pole magnetically coupled to the magnetic pole portion and the other pole close to the free end portion in contact with the magnetic pole portion; and the permanent magnet device that attracts the free end portion of the armature to the magnetic pole portion. and a return spring having a spring force greater than an attractive force of the magnet device to separate the free end portion from the magnetic pole portion.