JPS62138039A - Forming method for insulation film on coil core - Google Patents

Abstract

PURPOSE:To exactly form an insulation film in a short time, by using ultraviolet-ray-hardening type resin to be partly irradiated, and by hardening the resin to form the insulation film. CONSTITUTION:A coil core 2 is dipping-coated with ultra-violet-ray-hardening type resin. When the coil core 2 is irradiated with ultraviolet-ray-irradiating lamps 6, 7 through slits 8, 9 and a section only wound up with a coil is exposed to light, then the ultraviolet-ray-hardening type resin at the corresponding section is soildified. After that, the coil core 2 is cleaned by solvent, and non-hardened resin is removed. Dipping-coated cloth is used, and so an insulation film is hardly uneven. By controlling the irradiation, the coil core can be treated also in a complicated shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for forming an insulating film on a coil core of a motor or other electromagnetic device.

[Prior Art] Conventionally, as a method of partially insulating the windings of a coil core for insulation, there has been a method of wrapping an insulating tape around the windings of the coil core or an insulating coating on the windings of the coil core. Methods of manually applying and curing the agent are known.

[Problems to be Solved by the Invention] In the above-mentioned conventional example, the method of winding the tape is labor-intensive, increases processing time, increases costs, and is difficult to handle when the shape of the part is complex or minute. Ta. Furthermore, with manual application, the thickness of the insulation coating varies widely and performance cannot be guaranteed, and if a thick coating is applied to ensure insulation, problems will arise with the dimensional accuracy of the entire movement.

Furthermore, manual work made it impossible to ensure dimensional accuracy at the boundary between the insulating part and the conductive part.

[Means for Solving the Problems] This invention solves the drawbacks of the conventional examples, and involves partially irradiating the coil core with light using an ultraviolet curable resin to harden the resin and form an insulating film. It was designed so that it could be formed.

[Example] In FIG. 1, a coil core 2 is gripped by a chuck jig 1, and the coil core is dipped into a container 4 containing an ultraviolet curable resin 3 to be coated. Note that by adjusting the viscosity of the ultraviolet curable resin 3 with a reactive diluent, the thickness of the insulating film to be formed can be controlled.

Examples of the ultraviolet curing resin 3 include the following.

(1) Epoxy acrylate system (2) Polyurethane acrylate system (3) Polyester acrylate system (4) Polybutadiene acrylate system (5) Melamine acrylate system (6) Polyene/polythiol system (7) Epoxy/Lewis acid system The coil core 2 is placed on a conveyor and conveyed to the ultraviolet irradiation section 5. The ultraviolet irradiation section is provided with two ultraviolet irradiation lamps 6.7 as shown in the second figure, and the light from these lamps is passed through an upper slit 8. The light passes through the lower slit 9 and onto the coil core 2 while it is flowing on the conveyor, so even if the coil core is a plate, the light hits the sides other than the top and bottom, and the part where the coil is wound is illuminated. The entire circumference can be irradiated.

Next, as shown in the third figure, the coil core 2 is placed in a container 11 containing a solvent 10, and the uncured resin portion is removed. Solvents used here include organic solvents such as acetone and methyl ethyl ketone.

In addition to the two series of embodiments, other methods of light irradiation may be used. For example, a shutter may be used instead of a slit, or the ultraviolet rays may be irradiated from one direction and a chuck holding the coil core may be rotated.

[Effects of the Invention] According to the present invention, the formation of the insulating film on the coil core can be automated, resulting in cost reduction. Furthermore, since the curing time of ultraviolet curable resin is extremely short, at several tens of seconds, the processing time can be shortened. Furthermore, because the coating is applied by dipping, there is little variation in the insulating film and the quality is stable, and by accurately controlling light irradiation, it is possible to process even fine and complex-shaped coil cores.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams showing the method of the present invention in the order of processing steps. 2... Coil core 3... Ultraviolet curing resin or above (1 other person) Figure 2

Claims (1)

[Claims] Insulation of the coil core characterized by coating the coil core with an ultraviolet curable resin by dipping, irradiating ultraviolet rays only to the parts where an insulating film is needed to harden the resin, and then removing the uncured resin parts. Film formation method.