JP2005303145A - Fastening method of member for energy converting appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the fastening method of the members for an energy converting appliance. <P>SOLUTION: When assembling an energy converting appliance, in the case wherein the magnetic members for the energy converting appliance are fastened to each other or the magnetic members are fastened to other members, the fastening method of the members for the energy converting appliance has processes for: fastening temporarily the members to each other in order to secure their positional fastening accuracies; applying thereafter to the members a binding liquid having the function of binding the members by drying or for dipping thereafter the members into the binding liquid; and drying thereafter the members bindingly so as to fasten the members to each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an energy conversion device, and more particularly to a method for fixing a member for an energy conversion device.

Examples of energy conversion devices include electric motors, actuators, generators, transformers, and reactors. In general, an iron core forming a magnetic circuit is used for these.
Many of the iron cores are made by laminating electromagnetic steel sheets, and the laminated iron core is fixed to the case by shrink fitting or press fitting.
In fixing the laminated iron core, it is necessary to increase the fixing stress due to shrink fitting or press fitting in order to ensure the mechanical rigidity and strength of the entire device and to suppress vibration noise. However, there is a problem that the performance of the iron core or the like is greatly deteriorated due to the strong fixing stress. In order to avoid such a problem, it is possible to adopt a mold or the like instead of shrink fitting or press fitting. However, the mold is time consuming and expensive. In addition, a method has been proposed in which the fixing stress by shrink fitting or press-fitting is controlled to maintain a necessary fixing force and suppress deterioration of the iron core or the like as much as possible (for example, see Patent Document 1). This method also requires measurement and control of fixed stress, but measurement is difficult and control of fixed stress is very difficult.

  Fixing the iron core or fixing the iron core and other members includes bonding, bolt fixing, and fitting. However, since there is no bolting part or fitting part in the bonding, it can be made small, but in order to fix accurately, bonding Before doing this, it is necessary to deal with jigs and equipment for fixing and bonding at an accurate position, and bolting requires that the member be enlarged as much as the bolt hole portion.

  Recently, the inventors have developed a simple bundling method using a liquid containing a silicon compound (hereinafter referred to as dry bundling method) (see, for example, Patent Document 2), but the present invention uses this newly developed dry bundling method. A method for preventing the deterioration of the electromagnetic performance of the equipment due to the stress caused by the fixation is proposed instead of the conventional fixing method.

The dry bundling method means that when a magnetic member used in an electromagnetic device is composed of a plurality of magnetic materials, the plurality of magnetic material pieces are arranged and assembled and dried while maintaining the state. In this method, a plurality of magnetic material pieces are bundled by applying a liquid having an ability to bind the pieces together or dipping in the liquid and then drying.
JP 2001-8420 A JP 2003-193263 A

  In the present invention, the fixing of the iron core as a member for energy conversion equipment and the fixing of the iron core and other members include adhesion, bolt fixing, and insertion, but a fixing method that realizes a fixing stress lower than these methods and Provide high-performance energy conversion equipment by the fixing method.

The features of the present invention are as follows.
(1) When assembling the energy conversion device, after fixing the magnetic member for the energy conversion device and fixing the magnetic member and the other member, after performing temporary fixing to ensure the fixing position accuracy, A method for fixing a member for an energy conversion device, which comprises applying a bundling liquid having a function of bundling by drying or dipping in a bundling liquid and then drying and fixing.

(2) The method for fixing an energy conversion device member according to (1), wherein the temporary fixing force is 1/10 or less of the binding force by the dry binding method.

(3) An energy conversion device using the method for fixing an energy conversion device member according to (1) or (2).

  When temporary fixing and dry bundling method are applied for fixing energy conversion equipment members as in the present invention, the core fixing strength required for the final equipment performance is secured by the dry bundling method. This can reduce the deterioration of the performance of the magnetic member.

  The member for energy conversion device of the present invention is a magnetic member used for energy conversion device in electrical energy and mechanical energy, for example, motor, actuator, armature in a generator, field core, relay, transformer, Iron cores for reactors, ignitions, choke coils, filters and inductors, regardless of application or model.

  Electric motors, actuators, and generators include induction machine types, synchronous machine types, DC machine types, reluctance types, and combinations of two or more types, including large to micro motors.

  In addition, transformers include winding transformers, product transformers, and other types of iron cores. Reactors include inverters, converters and choppers, devices used for power factor improvement by adjusting the phase of voltage and current, harmonics, etc. These are used for filters, ignition, etc., except for winding type and stacking type, those with and without air gap, saturable type, those used without saturation, and those using cut iron core.

The member for energy conversion equipment is obtained by processing a magnetic steel plate, and is used as an armature or field iron core or yoke, transformer iron core, reactor iron core, electromagnet iron core or yoke, or the like.
Magnetic steel plates as materials for iron cores and yokes include iron or iron alloys such as electromagnetic steel plates and thick plates, nickel alloys such as nickel and permalloy, cobalt and cobalt alloys, amorphous materials, and nanocrystal materials. Particularly, iron cores and yokes obtained by punching and laminating electromagnetic steel sheets are often used.

  Magnetic members, such as iron cores and yokes, are laminated together by punching like a rotating machine, combined with split cores, or wound cores that may be used for axial gap type rotating machines Also, some of them are plastically deformed, such as claw pole iron cores, and there are wound iron cores, stacked iron cores, etc., transformer irons, reactor cores, etc., and the present invention is applicable to all it can.

  In the present invention, after fixing the magnetic member for the energy conversion device in the assembly process of the energy conversion device and fixing the magnetic member and the other member, after temporarily fixing to secure the fixing position accuracy. Fixing is performed by a method of applying a binding solution having a function of binding by drying or dipping in a binding solution, followed by drying and stacking and binding (hereinafter referred to as a dry binding method).

  The bundling liquid has the above-mentioned bundling ability, and preferably has a pure silicone polymer and a modified composition as a liquid composition that can be easily dried and can easily obtain a predetermined bundling force and can be expected to have a certain bundling force even at high temperatures. A liquid containing one or more silicon polymers as a main component is preferable.

The pure silicon polymer is produced by hydrolyzing a known alkoxylane in a solvent-free or organic solvent and polymerizing it. Under the present circumstances, the coating film which has various performance is obtained by changing the kind of silane to be used.
The modified silicon polymer is obtained by modifying a pure silicon polymer with an organic resin. As a modification method, modification is performed by a known cold blend or condensation reaction.

  Tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, monomethyltrimethoxysilane, monomethyltriethoxysilane, monomethyltriethoxysilane, monoethyltriethoxy when producing a partial hydrolyzate of alkoxylane as a pure silicon polymer One or more of silane, dimethyldimethoxysilane, diethyldiethoxysilane, monomethyltriisobuoxysilane, monoethyltributoxysilane, and monovinyltriethoxysilane are used.

  As the modified silicone polymer, one or more of acrylic modified silicone polymer, alkyd modified silicone polymer, polyester acrylic modified silicone polymer, and epoxy modified silicone polymer are used.

In addition, when it is intended to obtain a high insulation resistance or withstand voltage in the binding film, inorganic oxide powder particles per 100 parts by weight of SiO ₂ of pure silicon polymer or modified silicon polymer as a filler in the silicon polymer Alternatively, a colloidal solution, organic resin powder particles, or one or more of these emulsion solutions are added in an amount of 0.1 to 50 parts by weight as a solid content. As a combined effect of adding this filler, adhesion to the core end face and the steel sheet surface is improved.

As an inorganic powder particle or colloidal substance to be added, one or more selected from SiO ₂ , Al ₂ O ₃ , TiO ₂ , ZrO ₂ and / or a composite material thereof having a primary particle diameter of 7 to 5000 nm Is added and blended in an amount of 0.1 to 50 parts by weight.

As temporary fixing means for securing the positional accuracy for fixing the magnetic member to the case or the substrate, shrink fitting, press fitting, band tightening, bolt tightening, or the like can be employed.
Temporary fixing shrink-fitting, press-fitting and bolting are for temporary fixing to the fixed position accurately when carrying out the dry binding method, and the strength of the temporary fixing is maintained during the dry binding method. The strength that can be used is sufficient, and it is not necessary that the strength is required when the device is driven. For example, the temporary fixing strength, that is, the temporary fixing force may be 1/10 or less of the binding force by the dry binding method.
The strength required when the machine is driven may be obtained after the dry bundling method is performed. The strength can be reduced.
In addition, when fixing windings, permanent magnets, and sensors to iron cores and yokes, after fixing temporarily by band tightening or temporary bonding to ensure fixing position accuracy, fix them by the dry binding method. You can go. Also in this case, the strength of temporary fixing, that is, the temporary fixing force may be 1/10 or less of the binding force by the dry binding method.

  This was applied to the armature core of a general-purpose motor whose efficiency is legally regulated to suppress deterioration of core characteristics in caulking and fixing the core, and a high-efficiency general-purpose motor was manufactured. The armature core is shown in FIG. 1, and is an integrally punched iron core 11, and the temporary fastening is performed by crimping 16 on the outer peripheral side of the yoke portion 13 of the iron core that is less affected by the interlayer short circuit, and then the core is press-fitted into the case 19. The tightening allowance for press-fitting is about 1/100 mm, which is smaller than the conventional size and can be reliably maintained at the iron core fixing position.

After the press-fitting, as shown in FIG. 2, a bundling liquid (a silicone solution in which pure silicon polymer (R (SiOR) 3 composition) having a concentration of 60% is dissolved in toluene) is poured into the bundling liquid at the contact portion 17 between the case 19 and the iron core 11. Was sucked into the groove 18 and dried at 85 ° C. for 5 hours.
The fixing of the case and the iron core by the dry bundling method of the present invention was such that the iron core did not move from the case even if it was pressed in a direction opposite to the press-fitting direction with a force ten times the force of the temporary fixing press-fitting of this time.

This press-fit was made smaller than the conventional tightening allowance to reduce the stress on the iron core and to suppress the deterioration of the iron loss characteristics of the iron core to less than 1/2 of the conventional method.
In addition, the insulation between the winding and the iron core is advantageous in terms of cost and process because it combines the inter-layer binding of the iron core and the fixing between the case iron cores.
Furthermore, since it is integrally fixed with the iron core, winding, and case, the mechanical rigidity of the stator itself can be increased, which is advantageous in terms of noise and vibration.

A stator core in which 12 divided cores were combined with an 8-pole, 12-slot IPM motor for an electric vehicle was used.
The laminated body was temporarily fixed to the outer periphery of the split core yoke part by laser welding near both ends in the circumferential direction of the outer peripheral part.
Thereafter, the tooth part is sandwiched from both ends in the laminating direction, immersed in a binding solution [epoxy-modified silicone polymer solution (concentration: 50%, solvent toluene)], taken out from the solution, and then, when the stator is assembled, another adjacent divided core The portion in contact with the substrate was blown at a high pressure with a blower that blows hot air at 80 ° C., and the bundling liquid at the contact portion was removed and dried. In order to ensure interlayer bonding, it was further dried for 3 hours in an oven at 80 ° C.

A stator was assembled by combining 12 split iron cores using this dry binding method, and then press-fitted into the case with a fastening allowance of 2/100 mm.
This tightening margin is smaller than the case where only the press-fitting is fixed to the case, and the fixing force is insufficient. Therefore, in order to increase the fixing force between the case and the iron core, the bundling liquid is dipped between the case and the iron core and reinforced by tying it dry. .
Compared to the conventional outer periphery of the yoke part and the split iron core laser-welded to the tooth tip, the outer peripheral dimension accuracy in the combined state of the split iron core is within the punching dimension error. The increase in iron loss due to press-fitting was ½ or less.

The step-up chopper shown in FIG. 3 was manufactured by the method of the present invention. 4 is a longitudinal sectional view of FIG. First, the manufacturing method of the iron cores 21 and 22 for choppers is demonstrated.
A 0.2 mm thick magnetic steel sheet was punched into a strip shape and swaged. Caulking was performed at one place with V caulking 23 at the center of the strips, and was performed for the purpose of stacking and binding the strips. The reason for using one caulking is to avoid performance degradation due to an interlayer short circuit when a plurality of crimps are applied. In addition, in order to secure the stacking direction with a single caulking, V caulking was used.

The caulking is not a plurality of conventional caulking, and the caulking depth is 3/4 of the plate thickness, which is smaller than 3/2 of the conventional plate thickness, so that the core performance is deteriorated by caulking stress. Suppressed.
Thereafter, it is dipped in a binding solution [solubility of 40% (solvent, isopropyl alcohol) as a pure silicon polymer], applied to a film thickness of 30 μm, and dried and cured at 120 ° C. × 3 Hr for iron core 21 for chopper, 22 was produced.

Next, the chopper is assembled. As shown in FIG. 4, the coil 27 is inserted into the chopper iron core 22 and is assembled as shown in FIG. 26.
Thereafter, the iron core, windings, and spacers were integrally fixed using the same bundling liquid as when the iron core was manufactured.

It is explanatory drawing which shows V caulking. It is a top view of the iron core shown in FIG. It is a top view of a pressure | voltage rise chopper. It is a longitudinal cross-sectional view of a pressure | voltage rise chopper.

Explanation of symbols

11: Iron core 12: Tooth part 13: Joint part 14: Slot 15: Slot open part 16: V caulking 17: Contact part of case and iron core 18: Groove part 19: Cases 21, 22: Iron core 23 for chopper 23: V caulking 24 : Spacers 25, 26: Rubber for temporary fastening 27: Winding

Claims (3)

  When assembling the energy conversion device, when fixing the magnetic member for the energy conversion device or fixing the magnetic member to another member, dry it after performing temporary fixing to ensure the fixing position accuracy. A method for fixing a member for an energy conversion device, which comprises applying a bundling liquid having a function of bundling by dipping or dipping in a bundling liquid and then drying and fixing.   The method for fixing a member for an energy conversion device according to claim 1, wherein the temporary fixing force is 1/10 or less of the binding force by the dry binding method. The energy conversion apparatus using the fixing method of the member for energy conversion apparatuses of Claim 1 or 2.

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