JPS5948522B2 - AC electromagnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an AC electromagnet (single-phase AC electromagnet) in which a secondary coil can be easily formed.

Conventionally, as this type of AC electromagnet, by attaching a shaded coil (secondary coil) to the magnetic pole head of at least one of the fixed core and the movable core, a magnetic flux with a phase lag is generated in that part, and the fixed core There was one in which the minimum value of the composite adsorption force that adsorbs the movable core was made larger than the external repulsive force against the movable core.

Generally, the above-mentioned shaded coil is formed from a short-circuit ring punched from a strip material, but when this method is used, the short-circuit ring needs to be assembled to a fixed core, which requires time and effort, and it is also made from a strip material. When punched out, most of the strip material becomes scrap, making it impossible to utilize the material effectively, and since it is attached to the top surface of the magnetic pole, there is a drawback in impact resistance.

In order to achieve this impact resistance, it is necessary to use an alloy that does not easily cause fatigue (for example, chromium copper or phosphor bronze), making it expensive. In view of the above-mentioned drawbacks, the present invention
This invention provides a novel AC electromagnet in which a secondary coil is formed of a welded metal layer.

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

FIG. 1 shows a perspective view of an embodiment of an AC electromagnet according to the present invention. In FIG. 1, 1 is an E-type fixed core, 2 is an E-type movable core, 3 and 3a are core grooves provided in the fixed core 1, 4 and 4a are core grooves provided in the movable core 2, and 5 is the central leg of the fixed core 1 formed by the core grooves 3 and 3a,
7 and 7a are a right leg and a left leg, 6 is a central leg of the movable core formed by the core grooves 4 and 4a, and 8 and Ba are a right leg and a left leg. The fixed core 1 is composed of core bundles 101, 102, 102a that are magnetically separated and arranged in parallel, and non-magnetic intermediate layers 103, 103a in the gaps between them. A secondary coil Co is disposed on the central leg of the central iron core bundle 101.

The movable core 2 is a core bundle 2 that is magnetically separated and arranged in parallel.
01, 202, 202a, and nonmagnetic intermediate layers 203, 203a therebetween.

In an AC electromagnet with such a configuration, the minimum value of the pulsating attraction force is increased by creating a phase difference between the magnetic fluxes of the magnetic circuits of the three parallel iron cores, similar to conventional AC electromagnets. It is possible to eliminate the whine of the AC electromagnet.

FIG. 2 shows a specific configuration of the secondary coil of the AC electromagnet shown in FIG.

That is, the fixed core 1 includes core bundles 101, 102, 102a that are magnetically separated and arranged in parallel, and a non-magnetic intermediate layer formed between them by a welded metal layer of good conductivity such as aluminum. 103 and 103a, and are firmly seated, tightened, and fixed with iron core studs 13 that have been subjected to an electrically insulating surface treatment. The core bundles 101, 102, and 102a are all made of laminated cores punched into the same shape, and the core bundles 102 and 102a are laminated with the same number of cores. Iron core bundle 101,
102, 102a, as shown in FIG. 3a, trapezoidal grooves 51, 51a are provided in the central leg 5 symmetrically about the central axis. Iron core bundles 101, 102, 1 magnetically separated and arranged in parallel
In addition to forming non-magnetic intermediate layers 103 and 103a with a welded metal layer such as aluminum in each gap of 02a,
A secondary coil C2 is formed with the same welded metal layer in grooves 51 and 51a provided in the central leg 5 of each core bundle. The secondary coil C2 having the above configuration can be obtained, for example, by the manufacturing method shown in FIG. 4.

30 in the figure is a casting mold, and this casting mold 30 has an iron core stud 1.
3 parallel iron core bundles 101, 102, 1
02a and the respective gaps and grooves 51, 5 between the central core bundle 101 and the outer core bundles 102, 102a.
Non-magnetic intermediate layers 103, 103 are formed by pouring or casting molten metal 40 such as aluminum into 1a.
a, metal 401, 401a injected into the grooves 51, 51a shown in FIG. 5, and a part of the nonmagnetic intermediate layer 103, 103a.
A secondary coil of 01a-103a-401 is formed. Figures 3B and 3C show other embodiments of the invention.

Fig. 3b shows grooves provided in each core bundle of the fixed core], 51
A is provided at the yokes 9 and 9a, and a secondary coil G is formed at the bottom of the center leg, and FIG.
The non-magnetic intermediate layers 103, 103a prepared in advance with the above-mentioned non-magnetic intermediate layers 103, 103a and the iron core bundles 101, 102, 102a shown in FIG. Since the secondary coil is formed in the cutout portion 52 by inserting the secondary coil into the notch portion 52, there is no need to provide gaps between all the core bundles as in the above embodiment.
, 102, ]02a and nonmagnetic intermediate layer 103, 103a
If they are integrated, a gap (notch) will exist, and the secondary coil can be easily formed by pouring molten metal only into this gap. Further, in the above embodiment, the secondary coil C2 surrounds the central leg 5 of the fixed iron core 1, but it may also surround the right leg 7, the left leg 7a, or the yoke 9, 9a, depending on the case. Therefore, it can be provided on the movable iron core 2 side.

Furthermore, as other embodiments, the fixed core and the movable core can be implemented in various shapes; for example, a U-shaped core can also provide the same effect. As described above, according to the present invention, at least 3
In an AC electromagnet comprising a fixed core, a movable core, and an excitation coil L arranged surrounding the fixed core, a gap is formed between each of the core bundles, and at least the center core Since a groove is formed in the bundle spatially continuous with the gap, and a secondary coil is formed from a welded metal layer filled in the groove and the gap, the short-circuit ring punched from the strip material is used. Compared to conventional AC electromagnets, which are assembled with a fixed iron core and assembled as a secondary coil, the secondary coil can be easily formed and materials can be used more effectively. Furthermore, unlike conventional AC electromagnets, there is no need to attach a shorting ring to the magnetic pole head surface, so the structure can be designed with impact resistance in mind. An inexpensive AC electromagnet can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the AC electromagnet of the present invention;
Fig. 2 is a diagram showing the specific configuration of the secondary coil in Fig. 1, Fig. 3a is a diagram showing the shape of the fixed iron core in Fig. 1, and Figs. Figures showing other embodiments; Figure 4 is a diagram showing that the secondary coil and non-magnetic intermediate layer are formed of molten metal; Figure 5 is a diagram showing the secondary coil obtained from Figure 4. It is. 1... Fixed iron core, 2... Movable iron core, C
1... Excitation coil, 101, 102, 102a
... Iron core bundle, 51, 51a ... Groove, C
2... Secondary coil, 103, 103a...
...Nonmagnetic intermediate layer (gap) In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. In an AC electromagnet comprising a fixed core and a movable core configured by stacking at least three or more core bundles, and an excitation coil arranged surrounding the fixed core, each of the core bundles has a gap between the core bundles. At the same time, a groove is formed in at least the central core bundle of the fixed core or the movable core so as to be spatially continuous with the gap, and a secondary coil surrounding the central core bundle is formed as described above. An AC electromagnet characterized by being formed by a welded metal layer filling gaps and grooves. 2. The AC electromagnet according to claim 1, wherein the fixed iron core and the movable iron core are of E type, and the secondary coil is provided on the center side, the left leg, the right leg, or the yoke.