JPH0563006U - Polarized electromagnet - Google Patents

Abstract

(57) [Summary] [Purpose] A monostable or bistable type is manufactured without increasing the number of parts. [Structure] When the coil 2 is excited in the specified direction, the movable member 4 is attracted to one end 1a of the iron core 1 and one of the facing pieces 3a and 3b of the yoke 3 between the gaps 3d and 3e. Like permanent magnet
The magnetic pole pieces 41 and 42 are mounted opposite to each other on the both sides of 43, and the non-magnetic plate 44 is provided on the outer surface of the one magnetic pole piece 41. 41 permanent magnets
By changing the mounting direction to 43, the facing piece 3a of the yoke 3
Is disposed so as not to contact or to contact with. Therefore, if one magnetic pole piece 41 provided with the non-magnetic plate 44 on the outer surface is prepared, it is possible to change the mounting direction of the one magnetic pole piece 41 to the permanent magnet 43 without increasing the number of parts, and to obtain the monostable type or A bistable type can be manufactured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a polarized electromagnet.

[0002]

[Prior Art]

 As a conventional polarized electromagnet, there is one having a structure shown in FIGS. 3 and 4.

In FIG. 3, the iron core A, the coil B wound around the iron core A, and the opposing pieces C ₁ and C ₂ are parallel to each other with a gap on both sides of one end A ₁ of the iron core A. Located at the other end A _{2 of the} iron core A with a base piece C ₃ fixed to it, and a substantially U-shaped yoke C, and both magnetic pole pieces D ₁ and D attached to opposite sides of the permanent magnet D _{3. 2} is configured to have one end A _{1 of the} iron core A and a movable member D that is suction-released to the facing pieces C ₁ and C ₂ of the yoke C, and the yoke C with respect to the iron core A. It is symmetrical.

In the operation, when the coil B is excited so that one end A _{1 of the} iron core A becomes the N pole in the state of FIG. 3, the facing pieces C ₁ and C _{2 of} the yoke C are the S poles. On the other hand, since the magnetic pole pieces D ₁ and D ₂ of the movable member D are the N pole and the S pole, respectively, the movable member D is attracted and repelled by the magnetic pole pieces D ₁ and D ₂ to the coil B. The magnetic pole pieces D ₁ and D ₂ are moved by suction in the opposite piece C ₁ of the yoke C and one end A _{1 of the} iron core A by moving in the direction orthogonal to the axis of Since the magnetic flux of the permanent magnet D ₃ forms a closed magnetic circuit, that state is maintained. Next, when the coil B is excited in the opposite direction, the yoke C has a symmetrical shape with respect to the iron core A, and thus the operation shown in FIG. In other words, it becomes a so-called bistable polar electromagnet.

In FIG. 4, one of the facing pieces C ₁ and C ₂ of the yoke C in FIG. 3 is formed so that one of the facing pieces C ₂ is short enough not to come into contact with the magnetic pole piece D ₂ of the movable member D. Then, the yoke C is asymmetric with respect to the iron core A, and other configurations are the same as those in FIG.

To explain the operation, FIG. 4 shows that by exciting the coil B so that one end A _{1 of the} iron core A becomes an S pole, the pole piece D ₁ and the facing piece C ₁ and the one end A ₁ and the pole piece D ₁ are magnetized. It shows the state after the repulsion force acts between D ₂ and the attraction force acts between the end A ₁ and the pole piece D ₁ , respectively, and the pole piece D ₁ is attracted and held at the one end A _1. When B is de-excited, the opposing piece C ₂ is formed so short that it does not come into contact with the magnetic pole piece D ₂ , so the magnetic flux of the permanent magnet D ₃ leaks between the magnetic pole piece D ₂ and the opposing piece C _2. Is too large, so that the movable member D tries to form a closed magnetic path, and the magnetic pole piece D ₁ is attracted and held by the facing piece C ₁ and the magnetic pole piece D ₂ by the one end A ₁ , respectively, and returns to the original state. .. In other words, it becomes a so-called monostable polarized electromagnet.

[0007]

[Problems to be solved by the device]

 In the case of producing a monostable type of the above-mentioned conventional polarized electromagnet, a yoke is used so that the movable member D returns to its original state when the coil B is excited and then demagnetized. Unlike the bistable type, C has an asymmetrical shape with respect to the iron core A, so it is necessary to prepare and assemble the yoke C, which has a completely different shape from the bistable type. It could not be shared, and the number of parts increased, which was a factor of cost increase.

The present invention has been made in view of the above circumstances, and an object thereof is to manufacture a monostable type or a bistable type, and a polarized electromagnetic stone that can share components. To provide.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the polarized electromagnet of the present invention comprises an iron core, a coil wound around the iron core, and an iron core so that both opposing pieces are positioned with a gap on both sides of one end of the iron core. When the coil is magnetized in a specified direction and the substantially U-shaped yoke fixed to the other end of the core, it is attracted between one end of the iron core and one of the opposing pieces of the yoke between the two gaps. And a movable member having two pole pieces attached to opposite sides of the permanent magnet so as to always attract one pole piece of the movable member to one end of the iron core when the coil is not excited. Only when desired, a non-magnetic plate that can come into contact with the facing piece of the yoke is provided on the outer surface of the one pole piece.

Further, the non-magnetic plate provided on the outer surface of the one pole piece can be brought into contact with the facing piece of the yoke by changing the mounting direction of the one pole piece to the permanent magnet. Good.

[0011]

[Action]

 According to the polarized electromagnet of the present invention, when the coil is excited in the specified direction, the movable member is attracted to one end of the iron core and one of the opposing pieces of the yoke, and performs a so-called bistable operation. However, if a non-magnetic plate that can come into contact with the facing piece of the yoke is provided on the outer surface of the one pole piece, the magnetic flux of the permanent magnet during non-excitation will be changed by the non-magnetic plate. Since a closed magnetic circuit with a large magnetic resistance is formed between the magnetic pole piece and the magnetic pole piece, the force to be attracted and held weakens. Therefore, the monostable type can be manufactured by simply attaching the non-magnetic plate in common with the bistable type components.

In addition, when one pole piece having a non-magnetic plate provided on the outer surface is prepared in advance, if the non-magnetic plate is arranged so as not to abut on the facing piece of the yoke, it will be permanent. The magnetic flux of the magnet is not affected by the non-magnetic plate and acts as a bistable type by forming a similar closed magnetic path with both pole pieces. If the non-magnetic plate is placed so that it can abut the facing piece of the yoke by changing the mounting direction, the operation will be monostable, as described above, and therefore the number of parts will not increase. On the other hand, a monostable type or a bistable type can be manufactured only by changing the mounting direction of the magnetic pole piece to the permanent magnet.

[0013]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

First, FIG. 1 shows a bistable type, which is configured as follows. Reference numeral 1 denotes an iron core, which is made of a magnetic material such as electromagnetic soft iron and formed into a rod shape.

Reference numeral 2 denotes a coil, which is wound around the iron core 1 via the coil frame 2a with one end 1a thereof protruding.

Reference numeral 3 denotes a yoke, which is made of a magnetic material such as electromagnetic soft iron and has a substantially U-shape with both facing pieces 3a and 3b and a base piece 3c. The core 1 has voids 3d, 3e on both sides of the one end 1a and is positioned longer and parallel to the iron core 1. The center of the base piece 3c is fixed to the other end 1b of the iron core 1.

Reference numeral 4 denotes a movable member, one end portions 41a and 42a of which both pole pieces 41 and 42 are approximately half of their respective lengths are attached to both sides of the permanent magnet 43, and the other end portions 41b and 42b have a gap. A non-magnetic plate 44 made of a thin plate made of a non-magnetic material such as phosphor bronze is fixed to the outer surface of the one end 41a of the one pole piece 41. The movable member 4 has the other ends 41b and 42b disposed between the gaps 3d and 3e, respectively, and when the coil 2 is excited in the specified direction, both ends 1a of the iron core 1 and the yoke 3 are excited. It can be sucked into either one of the facing pieces 3a and 3b. However, at this time, the non-magnetic plate 44 is not in contact with the facing piece 3a of the yoke 3.

In the operation, when the coil 2 is excited so that one end 1a of the iron core 1 becomes the S pole in the state of FIG. 1, both facing pieces 3a and 3b of the yoke 3 become the N pole. On the other hand, since the magnetic pole pieces 41 and 42 of the movable member 4 are the N pole and the S pole, respectively, the movable member 4 is orthogonal to the axis of the coil 2 by the attractive repulsive force acting on the magnetic pole pieces 41 and 42. Moving in the direction, the magnetic pole pieces 41, 42 are attracted and held by the one end 1a of the iron core 1 and the facing piece 3b of the yoke 3, and even if the coil 2 is de-energized, the magnetic flux of the permanent magnet 43 is Forms a closed magnetic circuit, and the force for attracting and holding the movable member 4 is stronger than the force for returning it to the original state by a return spring (not shown), so that state is maintained. Then, when the coil 2 is excited in the opposite direction, the yoke 3 has a symmetrical shape with respect to the iron core 1, and therefore the operation shown in FIG. In other words, it becomes a so-called bistable polar electromagnet. However, at this time, since the non-magnetic plate 44 is not in contact with the facing piece 3a of the yoke 3, it does not affect the operation of the bistable type.

Next, FIG. 2 shows a monostable type, which is configured as follows using the above-mentioned bistable type members of FIG. 1 as they are.

That is, with respect to FIG. 1, the movable member 4 is attached by changing the attaching direction of the one pole piece 41 to the permanent magnet 43 so that the one end portion 41a and the other end portion 41b are reversed. Therefore, the non-magnetic plate 44 fixed to the outer surface of the one end portion 41a is arranged so as to be able to contact the facing piece 3a of the yoke 3 as shown in FIG.

Explaining the operation, in FIG. 2, when the coil 2 is excited so that one end 1a of the iron core 1 becomes the N pole, both facing pieces 3a and 3b of the yoke 3 become the S pole, while Since both magnetic pole pieces 41 and 42 of the movable member 4 are the N pole and the S pole, respectively, the movable member 4 is moved in the direction orthogonal to the axis of the coil 2 by the attractive repulsive force acting on the both magnetic pole pieces 41 and 42. The one pole piece 41 is attracted to the facing piece 3b of the yoke 3 via the non-magnetic plate 44, and the other pole piece 42 is attracted to the one end 1a of the iron core 1. Here, when the excitation of the coil 2 is cut off, the magnetic flux of the permanent magnet 43 forms a closed magnetic circuit having a magnetic resistance larger than that in the case of FIG. However, it becomes weaker than the restoring force due to an unillustrated return spring, etc., while the pole piece 41 returns to the state of FIG. Become.

In such a polarized electromagnet, as described above, the movable member 4 is such that the non-magnetic plate 44 provided on the outer surface of the one pole piece 41 faces the yoke 3 as shown in FIG. If the magnetic poles of the permanent magnet 43 are not affected by the non-magnetic plate 44, the magnetic poles 41 and 42 form a closed magnetic circuit, so that the magnetic flux of the permanent magnet 43 does not come into contact with the piece 3a. On the other hand, in contrast to the stable operation, by changing the mounting direction of the pole piece 41 to the permanent magnet 43, the non-magnetic plate 44 contacts the facing piece 3a of the yoke 3 as shown in FIG. The magnetic flux of the permanent magnet 43, when arranged so as to obtain the magnetic field, forms a closed magnetic circuit with a large magnetic resistance due to the non-magnetic plate 44. After returning, it operates as a mono-bistable type. Therefore, if one pole piece 41 with a non-magnetic plate 44 on the outer surface is prepared, A monostable type or a bistable type can be manufactured by simply changing the mounting direction of the pole piece 41 to the permanent magnet 43 without increasing the number of parts. It is easy to do, and it also reduces costs.

In this embodiment, the non-magnetic plate 44 is provided on the outer surface of the one end 41a of the one pole piece 41, but the outer surface of the one end 41a and the other end 41b are the same flat surface. Since it is a surface, the mounting direction of the one pole piece 41 to the permanent magnet 43 is changed from the state of FIG. 1 so that the non-magnetic plate 44 contacts the facing piece 3a of the yoke 3 as shown in FIG. When the movable member 4 is arranged so as to obtain the movable member 4, the operation stroke in the case of FIG. 2 becomes shorter than that in the case of FIG. 1 by the plate thickness of the non-magnetic plate 44. Therefore, if the outer surface of the one pole piece 41 is made lower at the one end portion 41a than the other end portion 41b by the plate thickness of the non-magnetic plate 44, one end in the state where the non-magnetic plate 44 is provided. Even if the outer surfaces of the portion 41a and the other end portion 41b have the same height, the operating stroke does not change even if the mounting direction of the one pole piece 41 to the permanent magnet 43 is changed.

In addition, in the present embodiment, one magnetic pole piece 41 having the non-magnetic plate 44 provided on the outer surface is prepared in advance, and the mounting direction of the one magnetic pole piece 41 to the permanent magnet 43 is changed. A monostable type or a bistable type was prepared.On the other hand, the non-magnetic plate 44 was not provided in the bistable type without changing the mounting direction of the pole piece 41 to the permanent magnet 43. Only in the case of the monostable type, it is sufficient to simply attach the non-magnetic plate 44 so that the non-magnetic plate 44 can abut the facing piece 3a of the yoke 3 by sharing the bistable type component.

[0025]

[Effect of the device]

 The polarized electromagnet of the present invention is made monostable by sharing a bistable type component and simply providing a non-magnetic plate capable of contacting a facing piece of a yoke on the outer surface of one of the pole pieces. Also, if one pole piece with a non-magnetic plate on the outer surface is prepared in advance, it should be arranged so that the non-magnetic plate does not come into contact with the facing piece of the yoke. In contrast to the bistable type operation, if the mounting direction of the pole piece on the one hand is changed and the non-magnetic plate is arranged so as to be able to contact the facing piece of the yoke, the monostable type will be obtained. As a result, it will be easier to perform assembly work and parts management, and cost will be reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing a bistable type according to an embodiment of the present invention.

FIG. 2 is a partial sectional front view showing the case of the above monostable type.

FIG. 3 is a partial cross-sectional front view showing a case of a bistable type of a conventional example.

FIG. 4 is a partial sectional front view showing the case of the above monostable type.

[Explanation of symbols]

 1 iron core 1a one end 1b other end 2 coil 3 yoke 3a facing piece 3b facing piece 3d void 3e void 4 movable member 41 one pole piece 42 the other pole piece 43 permanent magnet 44 non-magnetic plate

Claims (2)

[Scope of utility model registration request] 1. An iron core, a coil wound around the iron core, and a substantially U-shape fixed to the other end of the iron core so that both opposing pieces are positioned with a gap on both sides of one end of the iron core. Of the permanent magnet so that, when the yoke and the coil are excited in the specified direction, they are attracted to one end of the iron core and one of the facing pieces of the yoke between the air gaps. A movable member having both magnetic pole pieces, and it is possible to contact the opposite piece of the yoke only when it is desired to always attract one magnetic pole piece of the movable member to one end of the iron core when the coil is not excited. A polarized electromagnet, wherein a non-magnetic plate is provided on the outer surface of one of the pole pieces. 2. A non-magnetic plate provided on the outer side surface of one pole piece can be brought into contact with a facing piece of a yoke by changing the mounting direction of the one pole piece to a permanent magnet. The polarized electromagnet according to claim 1.