JPH043092B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an electromagnetic device, which is inserted between an iron core body and a coil, and is used to prevent iron core vibration that occurs when a predetermined alternating current voltage is applied to the coil. The present invention relates to a spacer that prevents whining noise caused by vibration and maintains an insulating distance between a coil and an iron core.

(Prior Art) As shown in FIGS. 5 and 6, in the conventional electromagnetic device of this type, a wedge-shaped spacer 3 is press-fitted between an iron core 1 and a coil 2 attached to the iron core 1. A structure is adopted in which a coil 2 is fixed to a body 1.

Generally, electromagnetic devices are treated with varnish, but varnish deteriorates over time.
Since the adhesion of varnish will be significantly reduced, it is necessary for the spacer 3 to suppress core vibration and coil vibration and achieve the purpose of insulation between the coil and the core body without varnish treatment during design, and varnish treatment is used as an auxiliary measure. I need to think about it.

(Problems to be Solved by the Invention) In the conventional structure, since the spacer 3 is formed in a wedge shape, the spacers 3, 3 are inserted along both end surfaces of the iron core 1, respectively, as shown in FIG.
are not press-fitted evenly, and due to deterioration of the varnish, the spacer 3, which was inserted shallowly, may come out due to the vibration of the iron core and coil when power is applied.
The humming noise becomes louder, and because the distance between both end faces of the iron core 1 and the coil 2 is uneven, the insulation distance between the coil 2 and the iron core 1 is short on the side where the spacer 3 is inserted shallowly. This results in insufficient insulation treatment, and
As shown in FIG. 8, the spacer 3 is tilted,
As shown in FIG. 9, the spacer 3 comes into contact with the coil 2 at one point, making insertion of the spacer 3 unstable.
It has the disadvantage that defects in the insertion process of the spacer 3 and defects due to changes over time are likely to occur, and the assembly workability is poor.

The present invention has been made in view of the above-mentioned problems.A spacer is inserted between a coil and an iron core to maintain an insulating distance between the coil and the iron core. Provides an electromagnetic device that prevents the spacer from slipping out by making wire contact with the spacer, prevents the occurrence of whining noise due to core vibration and coil vibration when AC voltage is applied, and does not cause defects due to process defects or changes over time. It is something to do.

(Means for Solving the Problems) The electromagnetic device of the first invention includes an iron core, a coil attached to the iron core, and a coil inserted between both end faces of the iron core and the coil. It consists of a spacer molded from resin that determines the distance between the core body and the coil, a stopper part for positioning and holding the spacer is formed protrudingly on the spacer, and a recess is formed in the spacer surface of the spacer. It is.

Further, in the electromagnetic device of the second invention, in the configuration of the first invention, the stopper portion of the spacer is engaged with the outer circumferential surface of the coil, and a recess is formed in the spacer surface facing the iron core surface side of the iron core body. This is what I did.

(Function) In the electromagnetic device of the first invention, by strongly inserting the spacer between the core body and the coil along both end faces of the core body, the spacer comes into line contact with the spacer surface. and then the second
In the electromagnetic device of the second invention, the stopper portions of the spacers are each engaged with the outer peripheral surface of the coil. The amount of insertion of both spacers becomes uniform, and the insulation distance between the core body and the inner circumferential surface of the coil becomes substantially the same on both end faces of the core body. Further, even if the core body prevents the laminated core from vibrating in the lamination direction, even if welding sag occurs, the spacer can escape the welding sag in the recessed portion, and the spacer can be reliably attached.

(Embodiment) The configuration of an embodiment of the present invention is shown in Figures 1 to 4 of the drawings.
The diagram will be explained.

Reference numeral 10 denotes an iron core body, which is composed of an E-type laminated core 11 and an I-type laminated core 12. A coil 13 is fitted into the center leg part 14 of the E-type laminated core 11. The side leg portions 15 of the E-shaped laminated core 11 and the I-shaped laminated core 12 are welded together.

Further, both the laminated cores 11 and 12 are welded at their central portions in the lamination direction. Furthermore, the bottom of the E-shaped laminated core 11 is welded to the mounting plate 26.

Next, 16 is an insulating spacer molded from synthetic resin that is inserted between the iron core 10 and the coil 13 and defines the distance between the iron core 10 and the coil 13, as shown in FIGS. 3 and 4. As shown, a recess 23 is formed in one side 22 of the spacer 16, which is connected to the end surface of the iron core 10, and the other side 17, which is connected to the inner surface of the coil 13, is inclined so as to become narrower toward the tip side. A stopper portion 18 that is engaged with the outer circumferential surface of the coil 13 is formed protruding from the base end portion of the side surface 17 in the shape of a protrusion.

Next, the operation of this embodiment will be explained.

Coil 1 is attached to the center leg portion 14 of the E-type laminated core 11.
3, the I-shaped laminated core 12 is butt-joined and welded to form an electromagnetic body 19 having a core cavity 21 as shown in FIG.

Next, as shown in FIG.
When the spacer 1 is strongly inserted between the iron core 10 and the coil 13 along both end surfaces of the iron core 10, the spacer 1
The one side surface 22 of the spacer surface of the spacer 16 is in line contact with the iron core surface due to the recess 23 on the one side surface 22 facing the iron core surface of the spacer 16, and the stopper portions 18 of the spacers 16, 16 are brought into contact with the outer peripheral surface of the coil 13, respectively. By engaging them, the amount of insertion of both the spacers 16, 16 becomes uniform, and the insulation gap l between the core body 10 and the inner circumferential surface of the coil 13 becomes approximately the same on both end faces of the core body 10.

If the tip end surface of the central leg core 14 of the E-shaped laminated core 11 of the core body 10 is welded in the lamination direction to prevent whining noise caused by vibration of the core body 10, welding sag will occur in the lamination direction. , even if this welding sag protrudes from the end surface of the iron core 10, the spacer 1
Since the recess 23 is formed in the spacer 6, the spacer 16 is reliably inserted between the iron core 10 and the coil 13.

Note that the spacers 16, 16 may be inserted before joining the I-type laminated core 12 with the coil 13 fitted to the E-type laminated core 11 of the core body 10.

〔Effect of the invention〕

According to the first invention, since a recess is formed in the spacer surface of the spacer inserted between the iron core and the coil, the spacer is brought into line contact, preventing the spacer from coming off, and ensuring that the spacer It will be installed.

Further, in the second invention, the spacer is formed with a stopper portion that engages with the outer peripheral surface of the coil to position and hold the spacer, so that the spacer is positioned and held by the stopper portion engaging with the outer peripheral surface of the coil. When inserting this spacer, the insertion dimensions of the spacer are evenly press-fitted, preventing the spacer from coming off, and the insulation distance between both end faces of the core body and the coil is kept constant, and the core body welds the laminated core in the lamination direction. Even if welding sag occurs when vibration is prevented by using the spacer, the spacer can escape the welding sag due to the recessed part, allowing the spacer to be installed securely, resulting in an electromagnetic device of stable quality and improved workability. be.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an electromagnetic device showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same as above, Figs. 3 and 4 are perspective views of a spacer as above, and Fig. 5 is an iron core of a conventional electromagnetic device. 6 is a sectional view of the same electromagnetic device as above, FIG. 7 is a sectional view showing a state in which the above spacer is incorrectly inserted, FIG. 8 is a perspective view showing a state in which the above spacer is incorrectly inserted, and FIG. It is a top view same as the above. DESCRIPTION OF SYMBOLS 10... Iron core body, 13... Coil, 16... Spacer, 18... Stopper part, 22... One side surface which becomes a spacer surface, 23... Recessed part.

Claims (1)

[Scope of Claims] 1. An iron core, a coil attached to the iron core, and a resin that is inserted between both end faces of the iron core and the coil and defines a distance between the iron core and the coil. What is claimed is: 1. An electromagnetic device comprising: a spacer formed by molding, wherein the spacer has a protruding stopper portion for positioning and holding the spacer, and a recess is formed on a spacer surface of the spacer. 2. From an iron core, a coil attached to this iron core, and a spacer molded from resin that is inserted between both end faces of this iron core and the coil and defines the distance between this iron core and the coil. The spacer has a protruding stopper portion that engages with the outer peripheral surface of the coil to position and hold the spacer, and a recess is formed on the surface of the spacer that faces the iron core side of the iron core body. Electromagnetic device.