JP2806517B2 - Coil wire - Google Patents

Description

The present invention relates to a coil wire used for an exciting winding of an electric device such as an electromagnetic relay. Conventionally, this type of coil wire is coated with an electrically insulating coating material such as a polyurethane resin or a polyimide resin dissolved in a mixed solvent containing a solvent having cresol, phenol and benzene nuclei around the outer periphery of a conductive wire such as copper. It is formed by baking and applying paraffin or oil or the like as a lubricant on the outer periphery of the insulating coating film in order to improve the slip of the wire and prevent disconnection at the time of winding. FIG. 1 shows a sectional structure of the coil wire agent. Here, reference numeral 1 denotes a conductive element wire, 2 denotes an insulating coating film, and 3 denotes a lubricant film. When the enameled wire having such a configuration is applied to the excitation winding 4 of the sealed electromagnetic relay as shown in FIG. 2, the solvent remaining in the insulating coating film of the winding 4 due to the operation of the relay is further reduced. The lubricant component evaporates and fills the closed container 5 as an organic gas, and the contact member 6 that opens and closes tends to increase the contact resistance and activate the contact, thereby greatly promoting the contact consumption. An object of the present invention is to provide a coil wire capable of solving the above-described problem in an electric device having an excitation winding. The present invention relates to a coil wire having a lubricant film formed on the outer periphery of an insulating film covering a conductive element, wherein the lubricant film has at least one of polypropylene glycol and hydrogen at the terminal thereof.
Characterized in that it is composed of one of the substances in which one is replaced by another reactive group. Further, the present invention is characterized in that, in the above configuration, the insulating film is made of a polyurethane resin using KA solvent as a solvent. Further, the present invention is characterized in that, in the above structure, the insulating film is made of a polyurethane resin using a mixture of xylenol and alcohol as a solvent. Next, embodiments of the present invention will be described with reference to the drawings. In the present invention, a solvent and a lubricant film used for dissolving a resin constituting an insulating film are provided in order to solve the above-mentioned problems caused by a coil wire obtained by applying a lubricant film to an outer periphery of a masked film covering a conductive element wire. The effects of the lubricant and the constituents were individually investigated and improved, and the effects as final coil wires were also investigated. On the other hand, even if gas is generated from a coil wire applied to an exciting winding of an electric device such as an electromagnetic relay, the generated gas does not (1) increase the contact resistance of the attached electric contact member, (2) The contact resistance is not increased by the amount of the mechanochemical reaction product due to the mechanical opening / closing operation of the member. (3) The amount of carbon generated by the arc of the electric contact member is small and the arc duration is not increased, that is, the contact consumption is not increased. It is desired that In order to evaluate these characteristics of the generated gas and to investigate the effects of the improved solvent and lubricant for the insulating film, an experimental device having a configuration as shown in FIGS. 3, 4 and 5 was used. Was. Hereinafter, these experimental devices will be described in detail. In the experimental device shown in FIG. 3, first, the gas released from the sample 9 and filled in the airtight container 7 adheres to the surface of the gold (Au) plate 8, and the adhered substance is removed. This is an experimental device for examining how to increase the surface contact resistance of the gold plate 8. After leaving for 200 hours, the surface contact resistance is measured by a four-terminal method using a pure gold stylus with a contact load of 1 gr.
Next, in FIG. 4, the degree of increase in the contact resistance of the electrical contact member 11 due to the insulating film formed by the electric contact member 11 serving as the specimen being excited by the coil 12 and being opened / closed is determined. This is an experimental device to be examined by a four-terminal contact resistance measuring device 13. The experimental apparatus shown in FIG.
A load circuit 14 is connected to an electrical contact member 11 as a specimen in a gas filled therein, and is opened and closed under an arc condition, and the arc duration is continuously monitored by an oscilloscope 15, so that the arc is operated at a certain number of operations or more. The purpose of this study is to observe that the duration increases sharply. Such an increase phenomenon is called activation of a contact, and it is preferable for an electric contact member that the number of operations up to this phenomenon is large and the degree of increase in arc duration is small. As a rough guide,
The influence on the specimen of the sample can be grasped by the number of contact operations until the activation of the contact. The above-described experiments are performed in an atmosphere at 120 ° C. The characteristics of each lubricant and solvent in the examples of the present invention were evaluated using the above-mentioned experimental items (1), (2),
When (3) was investigated, the results shown in FIGS. 6 and 7 were obtained. First, referring to FIG. 6, the conventionally used lubricant, spindle oil and paraffin are clearly inferior in the characteristics of the above evaluation items (1) to (3),
Polypropylene glycol for forming a lubricant film of the coil wire according to the present invention: average molecular weight 400, 1000, 2000, polyoxypropylene monobutyl ether: average molecular weight 700, 250
0, and polyoxypropylene monopropyl ether: an average molecular weight of 1000 was found to exhibit extremely good properties for all the evaluation items. Here, the latter 2
One of the materials is an example in which one of the terminal hydrogens of polypropylene glycol is replaced with a reactor, and the other homologous materials also show good properties. That is, it is basically based on the properties of polypropylene glycol, and the average molecular weight of such a substance determines the allowable range of viscosity when applied to a lubricant as a wire rod, as described later. Next, referring to FIG. 7, the solvent applied to the present invention, that is, KA Solvent (trade name: Solvent Naphtha 30% -acetyl) is compared with a wire rod before applying a lubricant using a solvent containing cresol for forming an insulating film. It can be understood that butyl cellosolve (70%) shows no significant difference in the evaluation item (1), but shows very good characteristics in the same items (2) and (3). In the present invention, the same results were obtained when acetyl butyl cellosolve or an alcohol-based mixed solvent containing no benzene nucleus was used for the xylenol of 40% or less. On the basis of such evaluation results, the first embodiment of the coil wire according to the present invention has a lubricant film formed of any of polypropylene glycol, polyoxypropylene monobutyl ether and polyoxypropylene monopropyl ether. The film is formed using a conventional solvent. Here, the average molecular weight of polypropylene glycol is related to the required viscosity as a lubricant, and about 1000 can be applied without changing the conventional winding method, but a method such as washing or baking immediately before or after winding is used. If implemented, a wide range of choices, up to 2000, is possible. In addition, the latter two substances can be selectively applied from exactly the same viewpoint. In order to evaluate the coil wire of this embodiment, a conventional enamel wire having an insulating film made of a polyurethane resin or a polyimide resin was formed by using polypropylene glycol, polyoxypropylene monobutyl ether and oxypropylene monopropyl ether on the outer periphery of each wire. Excitation windings were made by applying six types of coil wires having lubricant films formed thereon and four types of coil wires having lubricant films formed on the outer periphery of similar enamel wires using spindle oil and paraffin, respectively. As a result of investigating the performance of the electrical contact member incorporated in the sealed electromagnetic relay as shown in FIG. 2, the result as shown in FIG. 8 was obtained. That is, the contact performance in the case of using the above-mentioned six types of coil wires according to the first embodiment of the present invention is higher than that of the above-mentioned four types in the high-temperature storage test, the DC48V-10mA resistance load running test and the DC48V- Good characteristics were shown in each of the 0.5A resistance load running tests. In addition, the experimental results for the above-described three evaluation items using the coil wire alone showed the same tendency as the results shown in FIG. It is needless to say that the first embodiment of the present invention can be similarly applied to other general enameled wires (polyimide amide wires, polyester wires, etc.). Next, a second embodiment of the coil wire according to the present invention will be described. This embodiment is described in detail with reference to FIG.
KA solvent is used as a solvent for forming an insulating film, and the first
Is a polyurethane wire having a configuration in which a lubricant film is formed by applying the lubricant of the embodiment. Further, the same operation can be performed when an insulating film is formed by using a mixed solvent of xylenol and alcohol instead of the KA solvent. In this embodiment, since these solvents cannot be sufficiently applied to a heat-resistant wire such as polyimide in terms of dissolving power, it is preferable to apply the solvent to a polyurethane wire. As a result of evaluating the coil wire of this embodiment in the same manner as in the first embodiment, a wire obtained by applying spindle oil as a lubricant to a conventional polyurethane wire using a cresol-based solvent and a wire having the configuration described in the first embodiment In comparison with this, the device of the second embodiment exhibited the best performance under the respective evaluation conditions shown in FIG. That is, in the second embodiment, since the components such as cresol are not contained in the polyurethane resin constituting the insulating film, and the lubricant film is formed of polypropylene glycol or the like, the electric contact member as the final wire is exerted. The influence can be further reduced. The case where the coil wire according to the embodiment of the present invention is applied to the excitation winding of a sealed electromagnetic relay having a contact member has been described. However, other contacts that are magnetically driven to provide a mechanical contact and a non-contact state are provided. The present invention can be similarly applied to an electric device including members and an electromagnetic relay in which components are arranged in a housing in a somewhat airtight manner. As described above, according to the present invention, a lubricant consisting of polypropylene glycol or a substance in which at least one terminal hydrogen of this substance is substituted by another reactive group on the outer periphery of the insulating film covering the conductive element wire By providing the film, a coil wire in which generation of harmful gas is suppressed can be obtained.
In the case of a wire having an insulating film formed of a polyurethane resin, the resin is dissolved using a solvent such as KA solvent not containing cresol and phenol to form an insulating film. By applying
The generation of harmful gas can be further suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a coil wire, FIG. 2 is a configuration diagram of an electromagnetic relay showing an application example of the coil wire, and FIGS. 3, 4 and 5 show an embodiment of the present invention. Experimental apparatus for evaluating a coil wire according to an example, FIG. 6 is a view showing evaluation results of a lubricant forming a lubricant film of the coil wire of the embodiment, and FIG. 7 is forming an insulating film of the coil wire of the embodiment. FIG. 8 is a view showing the evaluation results of the solvent, and FIG. 8 is a view showing the evaluation results of the entire coil wire of the example. 1 ... conductive wire, 2 ... insulating film, 3 ... lubricant film.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshifumi Sakurai 5-33-1, Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Masahiro Izumi 2801 Shinyoshidacho, Kohoku-ku, Yokohama Daikoku Denki Line Stock In-company (72) Inventor Kimio Sugimura 2-147 Hosoki-cho, Kasugai-shi Terauchi Co., Ltd. (56) References JP-A-55-80205 (JP, A) JP-A-47-25566 (JP, A) 55-80207 (JP, A) IEICE Technical Report, Vol. 79, No. 208, p. 37-42 (EMC 79-35), December 1979 (58) Fields investigated (Int. Cl. ⁶ , DB name) H01B 7/02, 7/18 H01F 5/00

Claims (1)

(57) [Claims] In a coil wire obtained by applying a lubricant film on the outer periphery of an insulating film covering a conductive wire, the lubricant film is made of any of polypropylene glycol and a substance in which at least one terminal hydrogen of the glycol is replaced by another reactive group. A coil wire material characterized by being constituted. 2. 2. The coil wire according to claim 1, wherein said insulating film is made of polyurethane resin using KA solvent as a solvent. 3. 2. The coil wire according to claim 1, wherein said insulating film is made of a polyurethane resin using a mixture of xylenol and alcohol as a solvent.