JPH04363003A - Ac-dc electromagnet - Google Patents

Abstract

PURPOSE:To simply constitute a dc electromagnet and an ac electromagnet of a common part. CONSTITUTION:A dc electromagnet and an ac electromagnet are simply constituted by changing the mounting state (inside out) of an approximately L-shaped shading coil 5 having a residual piece 5b on a core 1 and common use of parts is realized in both types.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC/DC electromagnet.

0002

[Prior Art] A conventional electromagnet consists of an iron core wrapped with a coil, a yoke magnetically connected to the iron core, an armature, etc. Depending on the excitation state of the coil, the armature moves to the magnetic pole of the iron core. It operates by adhering to or separating from the surface, and when using it by applying direct current to the coil, it is generally used by installing a regular plate made of non-magnetic material between the armature and the iron core. This is because if this regular plate is not used, the return voltage characteristics may deteriorate due to long-term opening and closing, resulting in a return failure, so it is natural to use this regular plate. Met.

[0003] Furthermore, when using the coil by applying alternating current, the yoke, armature, etc. can be used in common with direct current type electromagnetic parts, but the iron core has its magnetic poles in order to smooth the alternating magnetic flux. It is a well-known practice to form a recess or the like in the recess and provide a shading coil made of a separate member in the recess.

0004

[Problems to be Solved by the Invention] Although the electromagnets described in the conventional example share some parts, such as the yoke and the armature, the direct current type and the alternating current type have different parts, such as the regular plate. Alternatively, it is necessary to provide a shading coil, and since the shape of the iron core is different between the two types, it is necessary to provide special parts for each type, making parts management complicated and making assembly work difficult. There was a problem.

[0005] The present invention aims to improve the above-mentioned problems, and its purpose is to construct DC and AC type electromagnets from exactly the same parts by simply changing the assembly state. It is an object of the present invention to provide an AC/DC electromagnet that can be used for both alternating current and direct current operations, and in which parts can be shared.

[0006]

[Means for Solving the Problems] In the AC/DC electromagnet of the present invention, the shaded coil is constructed of a substantially L-shaped non-magnetic material having a pair of window holes and a regular piece from one end, and the magnetic pole of the iron core is A recess is formed on the surface with both side walls that are fitted into the window hole of the shaded coil, and the iron core is shaded to prevent the regular piece of the shaded coil from coming into contact with the armature's magnetic pole facing surface when used with AC excitation. When the coil is attached and used with DC excitation, the regular piece of the shaded coil is provided to extend in the direction toward the armature's magnetic pole facing surface, and when DC excitation is used, the regular piece creates a gap between the armature and the iron core. A residual gap is formed between the two.

[0007]

[Function] In the AC/DC electromagnet of the present invention, the shaded coil is constructed of a substantially L-shaped non-magnetic material having a pair of window holes and a regular piece from one end, and the shaded coil is attached to the magnetic pole surface of the iron core. forming a recess with both side walls to be fitted into the window hole, and attaching a shading coil to the iron core so that the regular piece of the shading coil does not come into contact with the armature's magnetic pole facing surface when used with alternating current excitation; When used with DC excitation, the regular piece of the shaded coil is provided to extend in the direction toward the magnetic pole facing surface of the armature, and when DC excitation is used, the regular piece forms a regular gap between the armature and the iron core. Therefore, it is possible to easily configure electromagnets compatible with different types of excitation voltage (DC or AC) by simply changing the mounting state of the shaded coil on the iron core.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, the electromagnet is composed of an iron core 1, a coil 2, a yoke 3, an armature 4, a shading coil 5, and the like. The iron core 1 is inserted through a coil frame 2a having a coil 2 wound therebetween, and forms magnetic pole faces (1b, 1c) with a recess 1a at one end, and the other end is connected to one end of the yoke 3. is magnetically bonded to. Recesses 2b and 2c are formed above one end of the coil frame 2a, respectively.

The yoke 3 is made of an approximately L-shaped magnetic metal body, and has an iron core 1 inserted into the coil frame 2a on the bent inside thereof, so that the iron core 1 is arranged in parallel with the other end. It is composed of In addition, at the other end of the yoke 3, an armature 4 is swingably supported, which is biased in a direction away from the magnetic pole surface of the iron core 1 by a return means (not shown). amateur 4
is made of a roughly shaped magnetic metal body, and has one side forming a surface 4a facing the iron core 1, and the other end facing the other end of the yoke 3.

The shading coil 5 is generally L-shaped and made of a non-magnetic material such as a copper plate, and has a pair of window holes in the middle into which both side walls 1b and 1c of a recess 1a formed in the iron core 1 are inserted. A regular piece 5b is integrally formed at one end thereof. In addition, at the other end of this shaded coil 5, there is an engagement piece 5 extending in the opposite direction to the regular piece 5b.
A is provided to protrude slightly, and is adapted to fit into the recess 2c of the coil frame 2a when used with DC excitation.

When the shading coil 5 is driven by alternating current excitation, as shown in FIG.
is attached to the iron core 1 by fitting the side walls 1b and 1c of the iron core 1 into a pair of window holes provided in the middle with the armature 4 extending in a direction away from the magnetic pole facing surface 4a. At that time, the shading coil 5 is arranged at a position where the magnetic division ratio is suitable with respect to the iron core 1. Further, the tip of the regular piece 5b is connected to the coil frame 2a.
The shading coil 5 is fitted into one of the recesses 2b to increase the mounting strength of the shaded coil 5 as a whole.

Now, when the coil 2 is driven by applying an alternating current, the magnetic flux smoothed by the shaded coil 5 flows in the magnetic path, and the magnetic attraction force acting on the iron core 1 and the armature 4 returns to its original state. When the armature 4 is attracted to the magnetic pole surface of the iron core 1 (upper surfaces of both side walls 1b and 1c) and the application of alternating current to the coil 2 is stopped, the armature 4 is returned to its original state by the return means. performs the action of returning to .

Next, when driving by direct current excitation, the shading coil 5 is turned over as shown in FIG. At this time, the height of the regular piece 5b is configured to be at least higher than the magnetic pole faces (1b, 1c) of the iron core 1.

Now, when a DC current is applied to the coil 2, a DC magnetic flux flows in the magnetic path, and the armature 4 is attracted toward the magnetic pole faces (1b, 1c) of the iron core 1, and eventually comes into contact with the regular piece 5b. It stops working when it comes in contact with the target. At this time, a regular gap L is formed between the armature 4 and the iron core 1. Here, when the excitation of the coil 2 is stopped, the armature 4 is returned to its original state by a restoring means not shown in the figure, but the armature 4 cannot be returned to its original state even if the restoring means deteriorates due to long-term opening and closing. The regular gap L formed by the regular piece 5b allows an extremely stable return operation to be performed.

As described above, by simply reversing the mounting direction of the shaded coil 5 attached to the iron core 1, a DC type or AC type electromagnet with stable operation can be easily obtained.

[0017]

Effects of the Invention As explained above, the present invention comprises the shading coil made of a substantially L-shaped non-magnetic material having a pair of window holes and a regular piece from one end. A recess is formed with both side walls to be fitted into the window hole of the shading coil, and the shading coil is attached to the iron core so that the regular piece of the shading coil does not come into contact with the armature's magnetic pole facing surface when used with alternating current excitation. When used with DC excitation, the regular piece of the shaded coil is provided to extend in the direction toward the armature's magnetic pole facing surface, and when DC excitation is used, the regular piece creates a regular gap between the armature and the iron core. Since a gap is formed, it is possible to easily configure electromagnets compatible with different types of excitation voltage (DC or AC) by simply changing the mounting condition of the shaded coil to the iron core, and parts can be shared. Therefore, it is possible to obtain an AC/DC electromagnet that is completely compatible with AC/DC electromagnets.

[Brief explanation of drawings]

FIG. 1 is a partially cross-sectional side view showing an embodiment of the present invention using AC drive;

FIG. 2 is a side view, partially in section, showing an embodiment using direct current drive.

[Explanation of symbols]

1 Iron core 1a Recess 1b, 1c　　Both sides walls 2 Coil 3 York 4 Amateur 4a　Magnetic pole opposing surface 5 Shading coil 5b Residual piece L Residual gap

Claims (1)

[Claims] [Claim 1] An iron core wound with a coil is magnetically attached to one end of a substantially L-shaped yoke, and the other end of the yoke is provided facing the magnetic pole surface of the iron core so that it can be attracted and separated. In an AC type electromagnet in which the armature is swingably mounted and a shaded coil is provided at a position where the division ratio between the iron core and the armature is suitable, and the alternating current magnetic flux is smoothed and the opening/closing operation is performed, the pair of said shaded coils is provided. A concave portion is formed in the magnetic pole face of the iron core with both side walls that are fitted into the window hole of the shaded coil, and AC excitation is performed. When used with DC excitation, the shading coil is attached to the iron core so that the regular piece of the shading coil does not come into contact with the armature's magnetic pole facing surface, and when used with DC excitation, the shading coil's regular piece is attached so that it does not come into contact with the armature's magnetic pole facing surface. 1. A dual-use electromagnet, characterized in that the electromagnet is provided extending in a direction toward a surface, and a regular gap is formed between an armature and an iron core by the regular piece.