JPH071737B2 - Polarized electromagnet - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarized electromagnet applied to a single type relay or the like.

[Background technology]

As shown in FIGS. 8 and 9, a first magnetic pole piece 51 whose both ends are first magnetic pole portions 53a and 53b and a second magnetic pole piece whose both ends are second magnetic pole portions 54a and 54b. 52 facing each other, the permanent magnet portion 55 having the permanent magnet 50 interposed between the first magnetic pole piece 51 and the second magnetic pole piece 52, the first magnetic pole portions 53a and 53b, and the second magnetic pole portion 5
4a, 54b and a coil portion 59 having a coil 58 wound around the middle portion of a yoke 57 having both end portions 56a, 56b between them and one of the permanent magnet portion 55 and the coil portion 59 with respect to the other. The first magnetic pole portion 5 has a facing area facing the end portion 56a of the yoke 57 of the one first magnetic pole portion 53a while being rotatable.
There is a polarized electromagnet that is smaller than the second magnetic pole portion 54a facing 3a.

This polarized electromagnet is a bistable type in which the facing areas of the first magnetic pole portions 53a and 53b and the second magnetic pole portions 54a and 54b are all the same, and the facing area of the first magnetic pole portion 53a is, for example, the magnetic pole portion 53a.
Is cut by cutting a part thereof to make it smaller than the other. For example, by matching the spring load of a contact portion (not shown), the end portion 56a of the yoke 57 and the second magnetic pole portion 54a are It is possible to easily realize a single-type polarized electromagnet that brings the approaching state into a stable state.

However, this polarized electromagnet is
When the magnet 58 is excited, the end 56a of the yoke 57 rotates in the direction in which the end 56a of the yoke 57 approaches the first magnetic pole portion 53a having a small opposing area, which has a drawback that the magnetic resistance is large, the attractive force is small, and the efficiency is low. .

That is, in FIG. 9, Q ₁ is a bistable-type non-exciting attraction force curve, Q ₂ is also an exciting attraction force curve, Q ₃ is a non-excitation attraction curve of the single-type polarized electromagnet in FIG. Q ₄ is the excitation attraction force curve, Q ₅ is the spring load of the contact point, and the difference between the excitation attraction force curve Q ₄ and the spring load Q ₅ is small.

[Object of the Invention]

An object of the present invention is to provide a polarized electromagnet that can increase the attractive force when excited and can be made efficient.

[Disclosure of Invention]

In the polarized electromagnet of the present invention, an auxiliary piece is provided on at least one of the end portion of the yoke and the second magnetic pole portion facing the first magnetic pole portion whose facing area is small, and the auxiliary piece is provided when the coil is excited. A closed magnetic circuit including a yoke and a second magnetic pole piece is formed.

According to the configuration of the present invention, since the coil portion or the permanent magnet portion on the rotating side is attracted in the same direction as the operation direction by the auxiliary piece that forms the closed magnetic path when the coil is excited, the attraction force at the time of excitation Can be increased and efficiency can be improved.

Embodiments A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. That is, this polar electromagnet is composed of the permanent magnet portion 1 and the coil portion 2.

The permanent magnet portion 1 has a first magnetic pole piece 4 whose both ends are first magnetic pole portions 6a and 6b and a second magnetic pole portion 7a and 7b whose both ends are second magnetic pole portions 7a and 7b.
And the permanent magnet 3 is interposed between the first magnetic pole piece 4 and the second magnetic pole piece 5. N and S are magnetic poles of the permanent magnet 3.

The permanent magnet part 1 is configured to be rotatable with respect to the coil part 2. For example, as shown in FIGS. 1 and 2, the shaft 10 is erected at the center of the permanent magnet 3, and the shaft 10 is supported by bearings (not shown). Further, the facing area of one of the first magnetic pole portions 6a is made smaller than the facing area of the second magnetic pole portion 7a which faces the first magnetic pole portion 6a.

The coil portion 2 is composed of the magnetic pole portions 6a and 6b and the second magnetic pole portions 7a and 7b shown in Table 1.
A coil 9 is wound around an intermediate portion of a yoke 8 having both end portions 11a and 11b between and.

And the auxiliary piece 12 is the first magnetic pole part having a small facing area.
The auxiliary piece 12 is provided at the end 11a of the yoke 8 facing the 6a.
, The yoke 8 and the second magnetic pole piece 5 form a closed magnetic path when the coil 9 is excited, so that the tip portion 12a of the auxiliary piece 12 is formed.
Of the second magnetic pole portion 7a extends to the opposite side of the first magnetic pole portion 6a from the opposite side.

FIG. 3 shows an equivalent circuit of this polarized electromagnet, and Rg ₁ and Rg ₂ are, as shown in FIG.
Magnetic resistance of the air gap between 11b and the second magnetic pole portions 7a, 7b, R
g ₃ and Rg ₄ are both end portions 11a and 11b of the yoke 8 and the first magnetic pole portions 6a and 6
Rg ₅ is the magnetic resistance of the air gap between the second magnetic pole portion 7a and the tip 12a of the auxiliary piece 12, and Rg ₅ is the magnetic resistance of the air gap between the second magnetic pole portion 7a and the tip 12a of the auxiliary piece 12.

In the non-excitation state, the magnetic pole N appears on the second magnetic pole portions 7a and 7b,
The magnetic pole S appears on the first magnetic pole portions 6a and 6b. Further, in the stable state, the magnetic flux of the permanent magnet 3 is the path Φ ₁ indicated by the broken line arrow in FIG.
Flowing through. That is, in FIG. 1, the second magnetic pole portion 7a approaches the end portion 11a of the yoke 8 and the first magnetic pole portion 6b approaches the end portion 11b, so that the magnetic pole N → the second magnetic pole piece 5 → the second magnetic pole piece 5 Magnetic pole part 7a →
Gap of magnetic resistance Rg ₁ → End 11a of yoke 8 → Yoke 8 → End 11b of yoke 8 → Gap of magnetic resistance Rg ₃ → First pole piece 4
Flowing from the first magnetic pole portion 6b to the first magnetic pole piece 4 to the magnetic pole S.

On the other hand, the second magnetic pole portion 7b approaches the end portion 11b, and the first magnetic pole portion 6b
The path Φ ₂ of the magnetic flux when a is close to the end 11a is the third
It becomes like the arrow in the figure. However, since the facing area of the first magnetic pole portion 6a is small and the magnetic resistance Rg ₄ is large, the magnetic flux is small and the attractive force is small. If the attraction force at this time is set to be smaller than the spring load of the contact portion (not shown), the permanent magnet portion 1
Is not stable and returns to the stable state, so that single operation is performed. In this case, the auxiliary piece 12 and the second magnetic pole portion 7a approach each other, but the end portion 11b of the yoke 8 approaches the second magnetic pole portion 7b, so that the attraction force by the permanent magnet 3 is not generated.

Further, FIG. 4 shows an attractive force characteristic curve, P ₁ is a non-excitation attractive force curve, and P ₂ is a spring load. The second magnetic pole portion 7a is the end portion 11a
It can be seen that the spring load P ₂ larger than the attractive force is applied in the opposite direction at the position approaching, and the permanent magnet portion position returns to the stable position.

Next, in the stable state of non-excitation, when a current is applied to the coil 9 so as to excite the coil 9 in the direction opposite to the direction of the magnetic flux of the non-excitation path Φ ₁ passing through the yoke 8, the first magnetic pole portion 6b And magnetic poles having the same polarity as the magnetic poles N and S appearing on the second magnetic pole portion 7a appear on both end portions 11a and 11b of the yoke 8, respectively, so that a repulsive force is generated and the permanent magnet portion 1 rotates about the shaft 10. Both ends 11a and 11b of the yoke 8 are attracted to the first magnetic pole portion 6a and the second magnetic pole portion 7b, and the magnetic flux flows as the path Φ ₂ in FIG. Further, the yoke 8 → the end 11a → the auxiliary piece 12 → the tip 12a of the auxiliary piece 12 → the gap of the magnetic resistance Rg ₅ → the second magnetic pole portion 7a → the second
Magnetic pole piece 5 → second magnetic pole portion 7b → gap of magnetic resistance Rg ₂ → end portion 11b → the magnetic flux flows through the path Φ _{3 of the} yoke 8 as a closed magnetic path, so that it is in the same direction as the rotation direction of the permanent magnet portion 1. Auxiliary piece 12
Is generated in the permanent magnet section 1.

P _{3 in} FIG. 4 is an exciting force curve at this time. P ₄ is the same excitation attraction force curve as the excitation attraction force curve Q ₄ when the auxiliary piece 12 is not provided, and it can be seen that the excitation attraction force curve P ₄ is large.

Since the attraction force is not generated when the coil 9 is de-excited, the permanent magnet portion 1 returns to the non-excited stable state by the spring load P ₂ of the contact portion.

According to this embodiment, when the coil 9 is excited, the auxiliary piece
12, a yoke 8 and a second magnetic pole piece 5 form a closed magnetic path, and between the auxiliary piece 12 and the second magnetic pole portion 7 and between the second magnetic pole portion 7b and the end portion 11b. The attraction force generated at the time is added to the attraction force that causes the end portion 11a and the first magnetic pole portion 6a to approach each other, so that the attraction force at the time of excitation is increased and the efficiency is improved.

A second embodiment of the present invention is shown in FIG. That is, in this polarized electromagnet, in the first embodiment, the auxiliary piece 12 is provided on the second magnetic pole portion 7a, and the tip portion 12a of the auxiliary piece 12 is provided on the first magnetic pole portion 6a.
It is located on the side. Similar to the first embodiment, during excitation, magnetic flux is generated in the path Φ ₃ of the yoke 8, the auxiliary piece 12 and the magnetic pole piece 5, between the end portion 11a of the yoke 8 and the tip portion 12a of the auxiliary piece 12, and An attractive force is generated between the second magnetic pole portion 7b and the end portion 11b. Therefore, the same attractive force as the exciting attractive force curve P _{3 in} FIG. 4 can be obtained. Others are the same as those in the first embodiment.

A third embodiment of the present invention is shown in FIG. That is, this polarized electromagnet is the same as that of the permanent magnet portion 1 in the first embodiment.
Is fixed and a shaft portion 14 is provided at the center of the coil portion 2 so that the coil portion 2 can be rotated with respect to the permanent magnet portion 1. In the non-excitation and excitation operations of this embodiment, the coil unit 2
Is the same as that of the first embodiment except that it rotates with respect to the permanent magnet section 1.

A fourth embodiment of the present invention is shown in FIG. That is, this polarized electromagnet is the same as that of the permanent magnet portion 1 in the second embodiment.
Is fixed and a shaft portion 14 is provided at the center of the coil portion 2 so that the coil portion 2 can be rotated with respect to the permanent magnet portion 1. In the non-excitation and excitation operations of this embodiment, the coil unit 2
Is the same as the second embodiment except that it rotates with respect to the permanent magnet section 1.

The auxiliary piece 12 is provided on the yoke 8 in the first embodiment and on the second magnetic pole portion 7a in the second embodiment, but may be provided on both.

〔The invention's effect〕

According to the polarized electromagnet of the present invention, an auxiliary piece is provided on at least one of the end portion of the yoke and the second magnetic pole portion facing the first magnetic pole portion having a small facing area to assist the excitation of the coil. Since the closed magnetic circuit formed by the one piece, the yoke, and the second magnetic pole piece is formed, when the coil is excited, an attractive force is generated by the auxiliary piece in the same direction as the operating direction of the coil portion or the permanent magnet portion on the rotating side. Therefore, there is an effect that the attractive force at the time of excitation can be increased and the efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention, FIG. 2 is a schematic plan view thereof, FIG. 3 is an equivalent magnetic circuit diagram, FIG. 4 is an attraction force characteristic diagram, and FIG. 5 is a second embodiment. FIG. 6 is a perspective view of an example, and FIG.
FIG. 7 is a perspective view of the fourth embodiment, FIG. 8 is a perspective view of a conventional example, and FIG. 9 is a suction force characteristic diagram thereof. 1 ... permanent magnet part, 2 ... coil part, 3 ... permanent magnet,
4 ... 1st pole piece, 5 ... 2nd pole piece, 6a, 6b ...
1st magnetic pole part, 7a, 7b ... 2nd magnetic pole part, 8 ... Yoke, 9 ... Coil, 11a, 11b ... Both ends, 12 ... Auxiliary piece

Claims (1)

[Claims] 1. A first magnetic pole piece whose both ends are first magnetic pole portions and a second magnetic pole piece whose both end portions are second magnetic pole portions are opposed to each other, and the first magnetic pole piece and the second magnetic pole piece are opposed to each other. A permanent magnet portion having a permanent magnet interposed between the magnetic pole piece and a coil portion in which a coil is wound around an intermediate portion of a yoke having both ends between the first magnetic pole portion and the second magnetic pole portion. One of the permanent magnet portion and the coil portion is configured to be rotatable with respect to the other, and the facing area facing the end portion of the yoke of the one first magnetic pole portion is set to the first area. In a polarized electromagnet smaller than the second magnetic pole portion facing the magnetic pole portion, at least one of the end of the yoke and the second magnetic pole portion facing the first magnetic pole portion having the smaller facing area. By providing an auxiliary piece on either side, the auxiliary piece and front Polarized electromagnet, characterized in that the formation of the yoke and the closed magnetic circuit consisting of the second pole piece.