JPS5810331Y2 - Chiyokuryudenjishaku - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a DC electromagnet.

Conventionally, in a DC electromagnet, as shown in FIG. 1, a shielding plate 7 made of a non-magnetic material is placed between the armature 5' and the armature 5' in order to prevent the armature 5' from returning incorrectly when the coil 3' is demagnetized.
' was attached opposite to the magnetic pole face 1a' of the iron core 1'.

However, this device has the disadvantage that the magnetic shielding plate 7 wears out during use, which not only changes the return characteristics but also causes a return failure.

The present invention was developed in view of the above-mentioned drawbacks, and by dividing the fixed core in a direction orthogonal to the magnetic circuit, so as to set a magnetic gap with a spool, the return characteristics do not change during use. Does not cause poor recovery,
The present invention also provides an inexpensive DC electromagnet that is easy to assemble.

The present invention will be described below with reference to the accompanying drawings.

FIG. 2A-9 and FIG. 3 show various embodiments of the DC electromagnet according to the present invention, and the same members are given the same reference numerals.

First, in Fig. 2A, 1 is a substantially U-shaped fixed core;
Reference numeral 2 denotes a spool made of a suitable synthetic resin, the cylindrical part of which is wound with a coil 3, and the upper flange part 2a of which has an insert bottom shaped so that the fixed core 4, which is divided from the fixed core 1, exposes the magnetic pole face 4a. It is fixed at .

5 is an amateur. The spool 2 is fitted into the leg piece 1a of the fixed iron core 1 from above through the fitting hole 2b.

In this case, the magnetic circuit is formed by fixed cores 1 and 4 and armature 5, the fixed cores 1 and 4 are divided orthogonally to the magnetic circuit, and a non-magnetic material is placed between the divided portion, that is, between the fixed cores 1 and 4. Due to the presence of the partition wall 2C of the spool 2, a gap l exists between the fixed iron cores 1 and 4, which acts as a magnetic gap and has a magnetic shielding effect.

The opening in Figure 2 is an example in which the spool interposed between the fixed cores 1 and 4 is partially interposed at the peripheral edge, compared to Figure 2 A above.
As a result, a magnetic air gap 6 having a gap l having a magnetic shielding effect is set.

In FIG. 3, a partition wall 2C is formed in the middle part of the spool 2, and a gap l is provided between the fixed cores 1 and 4 by the partition wall 2C as a magnetic air gap, which has a magnetic shielding effect.

In each of the above embodiments, the divided fixed core 4 is fixed to the spool 2 by insert molding, but the fixed core 4 may also be fixed to the spool 2 by fitting or gluing. good.

According to the present invention, a magnetic shielding effect is obtained by dividing the fixed iron core with a spool and setting a magnetic gap, so that no external force is directly applied to the magnetic gap during use, and no residual Since the magnetic shielding effect is kept constant, the return characteristic will not change and cause a return failure.

Further, work efficiency is improved, such as eliminating the need to attach a special magnetic shielding plate to a fixed iron core, etc., and an inexpensive DC electromagnet can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a conventional DC electromagnet, FIG. 1.4... Fixed iron core, 2... Spool, 2C... Partition wall (magnetic gap), 3...
・Coil, 6...Magnetic gap, l...
gap.

Claims (1)

[Scope of utility model registration request] In a DC electromagnet in which a coil is wound around a fixed core via a spool made of synthetic resin, the fixed core is divided in a direction perpendicular to the magnetic circuit so that a magnetic gap is set by the spool. Characteristic DC electromagnet.