JPS61116805A - Varnish processing method for electric appliance coil - Google Patents

Abstract

PURPOSE:To economically execute high quality varnish impregnation processing within a short period by impregnating a single liquid type epoxy system insulating varnish containing hardening agent to the region to be insulated of an electric appliance coil and executing preliminary heating and heating for hardening to such region by inductive heating or far infrared ray heating. CONSTITUTION:The region to be insulated of electric appliance coil is impregnated with a single liquid epoxy insulating varnish containing hardening agent. The region to be insulated is subjected to preliminary heating and heating for hardening by the inductive heating or far infrared ray heating.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a method for varnishing electrical equipment coils.

[Technical background of the invention and its problems]

Conventionally, when varnishing various types of rotors used for high-speed rotation among electrical equipment coils, two-component epoxy solvent-free varnishes using acid anhydride curing agents with a heat distortion temperature of 100°C or higher have been used. It is used. As such a varnish treatment method, from the viewpoint of motor balance and workability, a drip impregnation treatment method is adopted in which varnish is dripped onto the winding portion of the rotor while rotating the rotor.

However, since an acid anhydride is used as a hardening agent, the dehumidification of the constituent members of the object to be treated, especially the wedge, is 90%
% must be completed. If this dehumidification treatment is neglected, the varnish itself will generate moisture during varnish treatment, making it impossible to achieve high-quality varnish insulation treatment. For this reason, the preliminary drying process for dehumidification requires a long time, and there is a problem that varnish treatment cannot be performed in a short time. In addition, if we try to shorten the curing time of acid anhydride epoxy varnish, the pot life (stable life) of the varnish will inevitably be shortened, and there will be waste when disposing of the remaining varnish at the end of the work. Since it is an acid anhydride-based curing agent, there is a problem in that the viscosity of the varnish increases and the amount of varnish that is dripped and impregnated changes. In order to suppress the increase in viscosity of the varnish, in order to ensure that a small amount of hardening agent was mixed, the amount of hardening agent mixed was frequently checked and expensive two-component measuring and mixing equipment was prepared. Incidentally, in the case of amine-cured enoxy varnish, there was a similar problem due to increased viscosity.

[Purpose of the invention]

The present invention provides a varnish treatment method for electrical equipment coils, which enables high-quality varnish impregnation treatment of electrical equipment coils in a short time and at low cost.

[Summary of the invention]

The present invention uses a one-component Nixy-based insulating face containing a hardening agent, and performs preheating and hardening heating using induction heating or far infrared heating, thereby providing high quality electrical equipment coils. This is a varnish treatment method for electrical equipment coils that can be impregnated with varnish in a short time and at low cost.

[Embodiments of the invention]

1 Hereinafter, embodiments of the present invention will be described.

) Method 4: First, the area to be insulated of the aerial coil is impregnated with a one-component epoxy-based insulating varnish containing a hardening agent. Examples of the insulated region include the winding portion of the rotor coil. The impregnation means employs a drip impregnation method in which phenol is dropped onto the area to be insulated. −
As a liquid epoxy-based insulating varnish, a latent curing agent that hardly causes the thickening effect of phenol, such as fucyanoamidoimidazole and BF.

Use an epoxy-based insulating varnish containing complexes, etc.

Next, preheating for dehumidification and curing heating for curing the pheno are sequentially applied to the insulated region impregnated with the pheno using induction heating or far infrared heating to complete the varnish impregnation treatment.

As described above, according to this varnish treatment method for electrical equipment coils, the preheating and curing heating are performed by induction heating or far infrared heating, so that the heating time can be significantly shortened. Furthermore, since a one-component epoxy insulating varnish containing a latent curing agent with almost no thickening effect is used, a dehumidification level of about 10% is sufficient, and the varnish impregnation process can be shortened. can. Incidentally, it has been experimentally confirmed that the varnish impregnation treatment time can be reduced by approximately 'AK compared to the case where an acid anhydride-based epoxy varnish is used.

Furthermore, since there is almost no increase in the viscosity of the phenol caused by the curing agent, the quality of the impregnation process can be improved by keeping the amount of varnish impregnated constant. Moreover, viscosity increasing metal equipment is not required, and varnish impregnation treatment can be performed at low cost. In addition, effective heating such as induction heating can shorten the time required for the after-kier process after dropping the varnish or omit the after-kier process. Furthermore, since the phenol has a long life, cleaning work of the varnish spong etc. after work can be omitted, and work efficiency can be improved.

〔Effect of the invention〕

As explained above, according to the method of varnishing an electrical equipment coil according to the present invention, it is possible to impregnate an electrical equipment coil with high quality varnish in a short time and at a low cost overall. .

Claims (1)

[Claims] It is characterized by impregnating an insulated area of an electrical equipment coil with a one-component epoxy-based insulating varnish containing a curing agent, and then preheating and curing the insulated area by induction heating or far infrared heating. Varnish treatment method for electrical equipment coils.