Manufacturing method of coil with insulating coating

Abstract

The method of manufacturing a coil with an insulating film includes: an electrodeposition coating process, except for the two ends (2) of the coil assembly (1) to be subjected to the insulating film, the part between the two ends (2) is passed through the electrodeposition coating process. Depositing and adhering insulating paint; and a baking process, baking the insulating paint attached to the coil assembly (1) after electrodeposition coating, thereby forming an insulating film on the coil assembly (1), in the electrodeposition coating process Previously, the coil assembly (1) to be insulated and coated was maintained in a state where the plurality of winding parts (4) formed between the two end parts (2) were spaced apart from each other and stretched, and in the stretched state An electrodeposition coating process and a baking process are performed.

Description

technical field [0001] The present invention relates to a method of manufacturing a coil with an insulating film by attaching an insulating coating to a flat coil obtained by processing a flat wire having a flat cross section by an electrodeposition coating technique, followed by baking. [0002] This application claims priority based on Patent Application No. 2015-246950 filed in Japan on December 18, 2015 and Patent Application No. 2016-242018 filed in Japan on December 14, 2016, and the contents thereof are incorporated herein. Background technique [0003] Insulated coated electric wires such as so-called enameled wires are manufactured by coating and baking an insulating resin-based insulating paint (varnish) on electric wires, and electrodeposition coating technology has attracted attention as a technique for applying the insulating paint. In addition, when the insulating coated electric wire is a coil used in a motor, a transformer, etc., when the insulating coating i...

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Problems solved by technology

[0010] However, as described in Patent Document 2, air bubbles are likely to be generated in the part where the coating is thick.

Therefore, when electrodeposition coating is performed on a wire-shaped wire before being processed into a coil, a film with a uniform thickness can be easily formed. However, due to the shape of the overlapped part and the bent part, the thickness of the film is likely to vary, and its drying and baking are also likely to become uneven.

Therefore, there is a problem that air bubbles tend to remain

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