JPS60174035A - Coreless armature - Google Patents

Abstract

PURPOSE:To obtain a coreless armature having excellent hot time size stability and excellent heat resistance by sealing an armature winding with a composite material of unsaturated polyester resin containing predetermined 3-function triazine compound and the prescribed inorganic substance. CONSTITUTION:A resin composition for sealing an armature winding is obtained by a composite material which contains 5-40wt% of unsaturated polyester resin containing 3-function triazine compound and at least 70wt% of inorganic filler. The armature winding and an armature shaft are filled in a mold heated in advance to 179 deg.C+ or -3deg, resin composition is sealed by a transfer molding under the conditions of 80kgf/cm<2> of plunger pressure and 80sec. of curing time, and a coreless armature having 3mm. of thickness in a flat shape is obtained.

Description

[Detailed description of the invention] Industrial applications The present invention is a copying machine, an automatic welding machine, and an NG machine tool.

Regarding armatures of iron-core motors widely used in the OA, FA, and electrical equipment fields such as car air conditioners, more specifically, armature windings formed from insulated wires or self-bonding insulated wires are made of thermosetting resin compositions. This invention relates to an ironless core armature that has a sealed structure and is used at relatively high temperatures.

Conventional configurations and their problems The characteristics and reliability of ironless motors usually depend to a large extent on the performance of the armature. In particular, the performance of the thermosetting resin composition is important for iron-core armatures that have a structure in which a stain-like winding is formed on an insulated wire or a self-bonding insulated wire, and this is sealed with a thermosetting resin composition. It has a significant impact.

For example, if a relatively large motor ranging from several watts to several kilowatts is repeatedly started and stopped,
Or if the ambient temperature is high, the ironless armature is usually 160
It may be used at relatively high temperatures of ~180''C.

Therefore, as a coreless armature, it has poor dimensional stability under heat in such a relatively high temperature range.

Thermal rigidity, hot strength, and heat deterioration resistance characteristics are important in ensuring the characteristics and reliability of this type of motor, and in order to satisfy these characteristics, for example, the armature winding is sealed with an epoxy resin composition. Things that had been stopped were put into practical use. The epoxy resin composition is a composite consisting of an epoxy resin, a filler, a mold release agent, and other additives added as necessary.

The reason why epoxy resin is used is heat resistance9 mechanical properties.

This is because it has excellent electrical properties, and since the curing reaction proceeds relatively slowly, there is little curing distortion and it is easy to ensure a high degree of dimensional stability. Furthermore, since the melt viscosity when sealing the armature winding is relatively low, it is easy to seal the dense armature winding, which is advantageous in maintaining the motor characteristics with less deformation of the armature winding. It is. Furthermore, alumina is included in the resin composition.

Because it is possible to mix relatively large amounts of fillers such as aluminum hydroxide, silica, and zirconium silicate, the difference in thermal expansion between the armature winding conductor and the resin composition that seals it is reduced.
Alternatively, the thermal conductivity of the resin composition becomes relatively high, and various properties such as thermal dimensional stability, thermal rigidity, hot strength, and heat resistance properties as a coreless armature are improved even at high temperatures of 160 to 180''C. This is because it is possible to secure enough properties for practical purposes.

As mentioned above, the composite of epoxy resin and a large amount of filler is an important component of the ironless armature to ensure advanced characteristics and reliability as a motor, but on the other hand, the epoxy resin hardens relatively slowly. This progressive fact had become a serious drawback from a productivity point of view.

On the other hand, unsaturated polyester resins polymerize and cure extremely quickly and are extremely effective for improving productivity, but the practical heat resistance of these unsaturated polyester resins is, for example, 80 to 100' for phthalic anhydride. C.

Isophthalic acid or terephthalic acid type resins can be used at about 160"C, and in addition, in order to ensure the dimensional accuracy of the ironless core armature, for example, if various thermoplastic resins are used as low shrinkage IJ, the ironless core armature can be used at high temperatures. This makes it even more difficult to maintain characteristics and reliability.

That is, the productivity of the ironless armature, the characteristics as a motor, and ensuring reliability were in contradictory situations.

Purpose of the Invention The present invention is characterized by the fact that polymerization curing is extremely effective (by sealing the armature winding with a thermosetting resin composition that also has heat resistance).
The aim is to provide a coreless armature that is used at a relatively high temperature of 160 to 180''C with extremely high productivity.

Structure of the Invention The structure of the ironless armature of the present invention consists of an armature winding portion and a resin composition for sealing this.
It is a composite composed of an unsaturated polyester resin containing 0% by weight of a trifunctional triazine compound and at least 70% by weight of an inorganic filler.

The configuration of the present invention will be explained in more detail below.

First, the armature winding referred to in the present invention is one wound with an insulated wire or a self-bonding insulated wire, and the end of the winding is usually electrically connected to a commutator piece.

As described above, the shape of the armature winding can be arbitrarily selected from a flat shape to a cup shape based on the design concept of the ironless motor.

Furthermore, the armature winding may include the armature shaft, which is an armature component, together with the commutator.

The resin composition referred to in the present invention is an unsaturated polyester resin containing 6 to 40% by weight of a trifunctional triazine compound and 70% by weight of a trifunctional triazine compound.
It is a composite with an inorganic filler weighing - or more.

The unsaturated polyester resin referred to in the present invention is a copolymerizable monomer solution of an unsaturated polyester alkyd, and may further contain various additives such as a polymerization inhibitor as necessary, and at least trifunctional triazine. 6-40% by weight of compound
It contains.

The unsaturated polyester alkyd consists of an unsaturated dicarboxylic acid as a carboxylic acid component and, if necessary, a saturated dicarboxylic acid, and a glycol component as an alcohol component. Examples of unsaturated dicarboxylic acids include fumaric acid, maleic acid, itaconic acid, and citraconic acid. As the saturated dicarboxylic acid, orophthalic acid, phthalic anhydride, and the like can be used, but isophthalic acid, terephthalic acid, tetrahydrophthalic acid, and hexahydrophthalic acid are preferable. Glycol components include ethylene glycol, 1,2- and 1,3-propanediol, 1e3- and 1,4-butanediol, diethylene glycol, diglobylene glycol, neopentyl glycol, alkylene oxide adducts of bisphenols, and hydrogenated Examples include bisphenols and their alkylene oxide adducts, alkylene oxide adducts of halogenated bisphenols, and 1,4-cyclohexane dimetatool.

Although a vinyl or allyl copolymerizable monomer may be appropriately used in the unsaturated polyester alkyd, the present invention uses an unsaturated polyester resin containing 6 to 40% by weight of a trifunctional triazine compound. It is something to do.

A trifunctional triazine compound is a compound having three allyl groups obtained by adding allyl alcohol to a triazine ring, and includes triallyl isocyanurate, triallyl cyanurate, and the like. If the triazine compound having three allyl groups is present in the unsaturated polyester resin in an amount of less than 6% by weight, the desired characteristics as a iron core armature cannot be maintained, and if it exceeds 40% by weight, curing distortion becomes large, resulting in a desired dimension. Accuracy cannot be achieved, resulting in serious drawbacks such as cracking.

It is preferable to use the unsaturated polyester resin containing 6 to 40% by weight of the above-mentioned trifunctional triazine compound together with a granular filler having a diameter of at least 7° and glass fiber. Moreover, if the inorganic filler is less than 700% by weight, hardening distortion is large and a coreless armature having desired dimensional accuracy cannot be obtained.

The composite of the unsaturated polyester resin having 6 to 40% by weight of a trifunctional triazine compound and an inorganic filler on at least 70% by weight further contains dicumyl peroxide, t-butyl perbenzoate as a polymerization initiator, 2.6
-Simethyl-215-dit(buterno-oxy)hexane, etc., and if necessary, higher fatty acids, higher alcohols, higher fatty acid esters, and metal soaps.

Additives commonly used in various composites such as carbon black, antimony trioxide, etc. can be used as appropriate. The mixing ratio and mixing method of such additives are determined within a range that satisfies the characteristics and reliability of the iron-core armature.

DESCRIPTION OF EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

For the unsaturated polyester alkyd of the unsaturated polyester resin, terephthalic acid was used as the saturated dicarboxylic acid component, and fumaric acid was used as the unsaturated dicarboxylic acid component. The trifunctional triazine compound is triallylisocyanurate, and the copolymerizable monomers are styrene, α-methylstyrene, and divinylbenzene.

diallyl orthophthalate, diallyl isophthalate,
Other vinyl esters were used.

Dicumyl peroxide was used as a polymerization initiator for the unsaturated polyester resins, calcium carbonate/glass fiber (90/10 weight ratio) was used as an inorganic filler, and certain amounts of fatty acid ester and carbon black were used as other additives.

Proportion (wt%) of inorganic filler in the resin composition among the above components: J=-, and proportion (wt%) of trifunctional triazine compound in the unsaturated polyester resin, and proportion of other than trifunctional triazine compound The proportion of copolymerizable monomers (
% by weight) were divided into S portions as shown in Table 1, and kneaded together with =-da.

In Table 1, Examples according to the present invention are 1 to 8. Comparative examples are 1-9. As a conventional example, an epoxy resin composition used in this type of ironless armature was used.

(Margin below) Table 1 (Note) Comparative Example 9 is for vinyl ester t-f, not unsaturated polyester alkyd.

On the other hand, approximately 1
30 turns/coil of self-bonding insulated wire with a 0μm 7-propylene resin adhesive layer is arranged in a flat shape with 13 coils, and the armature winding terminal is electrically connected to each commutator piece. The armature winding was prepared using

The above armature winding and armature shaft should be heated at 170'C±3do in advance.
It was loaded into a mold heated to
Each resin composition shown in Table 1 was sealed under the conditions of C to obtain a flat coreless armature with a thickness of 3 mm. However, in the case of the epoxy resin composition used as a conventional example, the curing time was 300 Se.
C, and was further subjected to 6H post-curing at 150'C.

Table 2 shows the results of measuring the surface runout of the above-mentioned coreless armature with reference to the armature shaft.

(Leaving space below) When a ironless armature is made from various resin compositions and armature windings as shown in Table 2, if the trifunctional triazine compound in the unsaturated polyester resin exceeds 40% by weight (comparison Example 1) Cracks appear in the ironless armature due to large hardening strain. In this case, cracking could not be prevented even if curing was adjusted by changing the gate cross-sectional area, gate shape, or various molding conditions. This phenomenon is the same when the amount of filler in the resin composition is 65% by weight or 60% by weight (Comparative Example 7.8). In addition, in the case of the example, the curing time was reduced from 300SeC to 5Q compared to the conventional example.
It has been shortened to SeC and has become a coreless armature with the same dimensional accuracy even without post-hardening.

Next, the above iron core armature was placed in a sealed container and heated to 180°C.
Table 3 shows the amount of change in surface runout when heated at +5dlSg for 500H.

(Leaving space below) As shown in Table 3, both the unsaturated polyester resin using divinylbenzene as a copolymerizable monomer (Comparative Example 4) and the one using vinyl ester (Comparative Example 9) have a diameter of 180". Cracks have occurred in the coreless armature due to heating at C, and other items (Comparative Examples 2, 3, 5.6)
The dimensional change during heating as a coreless armature is more than twice that of the example and the conventional example. However, the example has the same thermal dimensional stability as the conventional example.

Next, a molded product with the same thickness as the ironless armature (3 x 1 ON
MW x 100m171) at 180℃, 1800H
The subsequent heating loss is shown in Table 4.

(Leaving space below) As shown in Table 4, the unsaturated polyester resin Kyodo (Comparative Example 4) has excellent heat deterioration resistance, but as shown in Table 2, cracks occur when heated as a coreless armature. There is a serious drawback. It is clear that, compared to other comparative examples, the examples all have good heat deterioration resistance as well as the conventional examples.

Ru.

As described above, the example according to the present invention has significantly superior thermal dimensional stability and heat resistance of the ironless core armature compared to the comparative example using unsaturated polyester resin, and the epoxy resin shown as a conventional example Reliability at high temperatures similar to those using resin compositions can be ensured. In particular, in the case of the embodiment according to the present invention, the curing of the resin composition for the iron-free armature can be shortened from 300 Seq to 60 SeC compared to the conventional example, and the post-curing process of 160'C and 6H can be eliminated. Therefore, productivity has been significantly improved.

Effects of the Invention As described above, the present invention provides that the resin composition for sealing the armature winding comprises an unsaturated polyester resin having 6 to 40% by weight of a trifunctional triazine compound, and an inorganic filler having at least a To weight factor or more. It is composed of a composite of The iron-free armature according to the present invention has much better dimensional stability and heat resistance when heated than those using general unsaturated polyester resin as the resin composition, and has not been used in the past under relatively high temperatures. Reliability equivalent to that of the iron core armature with the armature winding sealed with the epoxy resin composition that was used can be ensured. Moreover, compared to the process of curing 300 SeC and post-curing 6H when sealing the armature winding with the epoxy resin composition, according to the example of the present invention, a weighted iron core armature can be obtained at 60 SeC, which significantly increases productivity. I can do it.

Claims (1)

[Claims] The thermosetting resin cured product that seals at least the armature winding portion is an ironless core that is a composite of an unsaturated polyester resin containing a trifunctional triazine compound weighing 5 to 40 weight and an inorganic substance weighing 70 weight or more. Armature.