JPS5992738A - Magnetic wedge - Google Patents

Abstract

PURPOSE:To prevent a reinforcing layer from cracking by setting the yarn density of a cloth used for the layer to 40-80% per unit area. CONSTITUTION:A glass cloth which has a thickness of 0.1mm. is formed by yarns using 2251/2 based on JIS R 3413 formed of glass fiber for warp yarns 10 and weft yarns 11 of 20 pieces/50mm.. This is used as a reinforcing layer 2, 26 sheets of which are superposed at an interval of approx. 0.5mm. and held. A magnetic mixture 3 in which 86wt% of iron powder and 2.5wt% of epoxy resin as a heat curable resin are mixed to the total weight is filled as magnetic powder, adhered to both upper and lower surfaces, and thermally press molded to obtain a magnetic wedge 1 having a thickness of 13mm.. In this manner, the magnetic mixtures at both sides of the layer are directly integrated, and a magnetic wedge which has improved strength, prevention of crack and high reliability can be obtained.

Description

[Detailed description of the invention] [Technical field of the invention] 1.: Invention if: k! 1st turn: 4A stator or rotor winding gold circle ZjLt-Relates to magnetic 1'1 Yujmata.

[Technical aspects of the invention 1. r scenery and its problems〕times+i'＜
4. For the purpose of improving melting customization, there is a method that uses a magnetic wire at the opening of the core slot where the winding is housed]7. As shown in Fig. 1, the conventional magnetic wedge (1) has a reinforcing layer (2) made of glass woven fabric, etc. as the center, and both sides of the wedge are coated with magnetic main powder such as ferrite powder, iron powder, etc., and epoxy, Magnetic mixtures (3) mixed with thermosetting resins such as polyester and polyimide (all 117H), which are molded under pressure and heat, have appeared. This draft) is the iron core (
The upper part of the winding (6) housed in the slot (5) of 4) is fully pressed down.

A force due to a magnetic flux changing in the direction of the arrow from the rotating magnetic field t is applied to this magnetic wedge (1) K, and it can be said that one station is exposed to stress during operation. Therefore, 4 (
When forming the slot (5), stress concentration occurs at the corner (8) of the groove (7) on the side surface of the opening of the slot (5), and when the reinforcing layer (2) is located here, the magnetic mixture ( 3) I-
The mechanical function of holding down the winding (6) together with the magnetic machine 1]S is not only ineffective, but also causes the gap between the stator and rotor to peel off from the reinforcing layer (2). Thick fx may pop out between the wires and damage the entire winding, leading to an accident. To prevent this phenomenon (・ζ, there is a way to increase the contact layer J with the reinforcing layer (2) by increasing the resin thickness, but this results in a decrease in the magnetic material and the magnetic wedge (1
) and l) of 1noC have the disadvantage that the magnetism decreases. It was also considered to add short glass fibers to the magnetic mixture for reinforcement by increasing the tl and increasing the strength of the magnetic wedge by +1%, but there was a large difference in specific gravity between the magnetic powder and the glass fibers. However, there are difficulties such as lack of stability in mixing, and it is difficult to put it into practical use.

[Purpose of the invention]

An object of the present invention is to provide a highly reliable magnetic wedge that prevents layer cracking in the rt reinforcing layer portion.

[Summary of the Invention] In the present invention, the yarn density of the woven fabric used for the reinforcing layer is set to 940 to 80 per unit surface area, and both the surface magnetic admixture and the surface area are directly integrated through the entire reinforcing layer. 1 on the reinforcing layer.
? Layer 1'? This is to prevent jl error.

Embodiment 1 Column 1 121F A first embodiment of the present invention will be described with reference to FIG. 1 to section 31.4.

Using 20 warp threads of 150 threads and a groove light thread, the threads are made of glass fibers based on JIS R3413 <22
5172 was used as a reinforcing layer (2) on a glass woven fabric with a thickness of 1 mm, and this reinforcing layer + 21 f, 26 sheets were stacked at intervals of about 0.5 mm, and the total weight was added to this as magnetic book powder. 86% by weight of iron powder and 2% as thermosetting resin.
, a magnetic mixture (3% by weight) mixed with 5% by weight of epoxy resin.
) was packed and adhered to both the upper and lower surfaces, followed by pressure and heat molding to obtain a magnetic wedge (1) with a thickness of 13 mm.

This magnetic wedge (1) presses the upper part of the winding (6) housed in the slot (5) of the iron core (4) as shown in FIG. In Figure 5, the reinforcing layer (2) is indicated by the dotted line 1
Although only 6 sheets are shown, the rest have been omitted, and there are actually 26 sheets. The thread density of this woven fabric is approximately 40 threads per lateral thread.

This magnetic wedge (1) is tested according to JIS K69 at various temperatures.
A cleavage strength test was conducted based on No. 11, and the results are shown in curve a in FIG.

Example 2 The apparent drawing of the second example is as in the first implementation row, with 30 warps and 150 threads tllF? and weft (old) all used, 111/) made on the same acupuncture needle as in 1911,
A cracking strength test was conducted using the same Shiba-jo, and the results are shown in curve 1) in Figure 6. The thread density of the woven fabric in this case is approximately 60 thread density per unit area.

Example 3 The apparent drawing of the third example is the same as that of the first example, with 40/50 warps (10 and 1 yellow yarn Ql).
1 was fabricated in the same manner as in the first embodiment and subjected to a cleavage strength test under the same conditions, and the results are shown in curve C in Figure 6.
-It is. In this case, the thread density of the woven fabric is approximately 8 (
) is φ.

Reference Example Next, in the Reference Example and 1~, the thread density of the woven fabric conventionally used for the reinforcing layer (2) is close to about 100 per area, IJI] et al! 10th tree/! 5 tl friend's warp (11
It was manufactured in the same manner as in the first 7q example using Zhen and I yellow threads, and was subjected to an opening strength test k12 under the same conditions, and the results are all shown in curve d in Figure 6. II', J Figure 6 shows the cleavage strength of this reference 1911, 4 + 1". The value of the temperature of O multiplied by 2 is taken as 100%, and the first row of each)'S applied is compared with the value of 0/L 0. The temperature of each of these magnetic components (1) is 12
If the yarn density of the woven fabric exceeds about 80 inches, it will suddenly change as shown in Figure 7. It can be seen that the value decreases to .

In other words, the conventional reinforcing layer (2) has strong cleavage even if it has as many as 26 layers! shows that it does not become large. IJ1] et al., J? of magnetic wedge (1)? As a result of fighting off the possibility of 4 cracks with cleavage strength, reinforcement J Emperor (2
) Due to the area between the threads of the glass woven fabric, the magnetism on both sides +
, l'b hydrate (3) is found to have an unifying effect.

- It is clear that reducing the weft density will result in a problem, but the nature of the combination of iron powder, which is magnetic powder, and thermosetting resin, which is binding material, is obvious. As the strength approaches the thread density, it is no longer related to the thread density, so the thread density should be increased to about 40 times the F limit of the thread density.
C is also not as strong as J.h. By setting the light density of the straw woven fabric to 40 to 80, the strength against abrasion is increased by 1゛☆. r: It can be seen that there is a clear improvement.

Similarly, the present invention is not limited to the embodiments described above and shown in the drawings; for example, the magnetic wood powder and VI resin can be applied in accordance with the I1M thermal properties required for the magnetic wood powder. The reinforcing layer (2) may be made of natural or synthetic fibers such as cotton, polyester, asbestos, etc., in the form of a woven fabric, etc., without changing the gist thereof. Of course.

〔Effect of the invention〕

As explained above, according to the present invention, by setting the thread density of the woven fabric as the reinforcing layer to 40 to 80 per unit area, the magnetic wooden box eyepieces on both sides of the reinforcing layer are directly integrated, and the strength is increased. 116b magnetism with high reliability is obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional magnetic wedge, and FIG. 2 is a cross-sectional view of a conventional magnetic wedge. Cross-sectional view showing the iron core slot section equipped with
Figure 3 is an enlarged cross section i4 showing the magnetic wedge of the present invention, Figure 4 Q
Figure 5 is a plan view showing the reinforcing layer in Figure 3;
εB6 Figure t is a curve diagram showing the cleavage strength of various magnetic wedges as a function of temperature t<K, and No. 7 1J shows the cleavage strength at internal temperature 12 (ν at 1°0) with respect to the yarn density of the woven fabric. It is a curve diagram showing I magnetic wedge 2 ili strong layer: 3 ・Magnetic mixing proboscis 10 Warp thread l1 Weft agent j1' Rishi I He Rikitsutsu 1
Figure 2 - Figure 3 Figure 5 □
-mm} 6th Figure 7 1 7 1 Eleven Φ-thread fAM (X

Claims (3)

[Claims] (1) In a magnetic diagram formed by inserting a reinforcing layer made of woven fabric inside a magnetic mixture proboscis made of a mixture of magnetic powder and resin, the thread density of the woven fabric is 40~ per unit area) (OL'f
). (2) Special W characterized by having multiple reinforcing layers
1' The magnetic wedge according to claim 1. (3) A characteristic feature of claim 1 is that the resin υ is a heat li+I4-forming resin, and the molding is carried out by pressure heating! The magnetic wedge described in the second beat.