JPS5919381Y2 - AC electromagnet - Google Patents

Description

[Detailed description of the invention] This invention relates to an AC electromagnet, particularly a small AC electromagnet in which the stroke of the movable iron piece is small.

Conventionally, this type of AC electromagnet has a card 3 attached to a movable iron piece 2 as shown by the dashed line on the side of the iron core 1, as shown in Figures 1 and 2. When applied, the Kumatori coil 4 is designed to make effective use of the dead space, due to the location of the member that operates the movable contact piece of the relay and the relationship with the external dimensions. It is attached so as to go around the leg portion 1a in its length direction.

For this reason, as is clear from the figure, the total length of the copper wire constituting the Kumatori coil 4 inevitably becomes long, and its electrical resistance increases, resulting in poor Kumatori efficiency.

Therefore, the purpose of this invention is to shorten the overall length of the magnet coil to provide an AC electromagnet with high efficiency and less undulation.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

Note that parts that are the same as or equivalent to the conventional ones shown in FIGS. 1 and 2 are given the same reference numerals.

In the figure, 1 is a U-shaped iron core, and 2 is one end of the iron core.
is hinged at the leg 1b, and the free end is connected to the tip of the other leg 1a,
That is, the movable iron piece 4 facing the magnetic pole surface 1C is a ring-shaped Kumatori coil that is partially fitted into a groove formed in the magnetic pole surface 1C and attached to the magnetic pole surface 1C by caulking or spot welding.

This Kumatori coil 4 is mounted on the magnetic pole face 1C in an upright state in the stroke direction of the movable iron piece 2, that is, in the direction of arrow a, and the free end of the movable iron piece 2 is loosely inserted into the Kumatori coil 2. be.

5 is an excitation coil wound around the iron core 1, and 6 is a coil frame thereof.

This AC electromagnet operates so that the iron core 1 is magnetized by energizing the excitation coil 5, and the movable iron piece 2 is attracted to the magnetic pole surface 1C.

By the way, the magnetic flux generated by the excitation coil 5 is divided into a magnetic flux Φ1 that interlinks with the Kumatori coil 4 and a magnetic flux Φ2 that does not interlink with the Kumatori coil 4.

An electromotive force is generated in the Kumatori coil 4 by the magnetic flux Φ1 interlinking with the Kumatori coil 4, and a current flows through the Kumatori coil 4.

This current generates a magnetic flux Φ3 to reduce the pulsation of the main magnetic flux.According to this invention, the Kumatori coil 4 has an inner diameter corresponding to the small hole stroke of the movable iron piece 2, so its total length is is much shorter than conventional ones, and its electrical resistance is also lower.

Therefore, the current flowing through the Kumatori coil 4 increases due to the magnetic flux Φ1, and the magnetic flux Φ3 increases.

Therefore, the pulsation of the main magnetic flux becomes small, and an AC electromagnet with good magnetic efficiency can be obtained.

In this way, according to this invention, not only can an AC electromagnet with high efficiency and low undulations be obtained, but the small size of the magnetic coil makes it inexpensive, and furthermore, the magnetic coil can also serve as a backstop for the movable iron piece, making it an excellent magnet. effective.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional AC electromagnet, FIG. 2 is a right side view thereof, FIG. 3 is a sectional view of an AC electromagnet showing an embodiment of this invention, and FIG. 4 is a right side view thereof. 1...Iron core, la, lb...leg, 1
c...Magnetic pole surface, 2...Movable iron piece, 4.
... Kumatori coil, 5 ... Excitation coil.

Claims (1)

[Claims for Utility Model Registration] An AC electromagnet comprising an iron core, an excitation coil wound around the iron core, and a movable iron piece that is attracted to a magnetic pole face of the iron core when the iron core is excited by the excitation coil, A groove for installing a Kumatori coil is provided on the magnetic pole surface of the iron core,
An AC electromagnet characterized in that an annular Kumatori coil is mounted upright in the groove, and a free end of the movable iron piece is loosely inserted into the annular Kumatori coil.