JPS58151850A - Varnish processing method of armature - Google Patents

Abstract

PURPOSE:To prevent adhered varnish from flowing out by a method wherein ultraviolet ray hardened varnish is applied on the space between commutator and coil to harden the varnish by means of ultraviolet ray irradiation. CONSTITUTION:Any conventional heat hardening varnish is dripped to impregnate winding coil 3 therewith further dripping ultraviolet heat hardening varnish added with ultraviolet sensitizer. Then said varnish is preliminarily hardened by means of ultraviolet ray irradiation. Next armature is heattreated to harden all varnish finally. In this case, the surface of adhered varnish on the space between the commutator 4 and coil 3 is already radical polymerized by sensitizer radical minimizing fluidization by heating adhered varnish to prevent it from flowing out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for varnishing an armature.

In an armature used in a motor, a commutator and a coil are sometimes connected by a flexible crossover wire instead of using a riser such as a copper plate.

To varnish the armature, a method is used in which the coil is impregnated with varnish, the varnish is deposited between the commutator and the coil at the time of impregnation, and then the varnish is hardened by heating. There is. In this case, the purpose of varnishing between the commutator and the coil is to secure the crossover wire against the centrifugal forces to which it is subjected during use of the armature.

However, during the above heat treatment, the varnish is simply heated and fluidized, so the varnish deposited between the commutator and the coil flows out due to the void in the place where it is deposited. It cannot be hardened with hardening varnish, and there is a limit to the fixing strength of the crossover wire against centrifugal force. Therefore, conventional treatment methods are problematic for armatures used in high-speed motors.

- The armature varnish treatment method according to the present invention is a method that can eliminate the above-mentioned disadvantages.1. A method in which a coil of an armature that connects a commutator and a coil with a crossover wire is impregnated with varnish, and the varnish is applied between the commutator and the coil, and then the armature is heat-treated to harden the varnish. ,
A method characterized in that the varnish applied between at least the commutator and the coil is an ultraviolet curing varnish, the varnish is cured by ultraviolet irradiation, and then the armature is subjected to the heat treatment. be.

The present invention will be explained below with reference to the drawings.

In the figure, 1 is a rotor shaft, a is an iron core fixed to the rotor shaft 1, and 3 is a winding coil installed in a slot of the iron core 2. In the figure, only both ends of the winding are visible. 4
is a commutator attached to the rotor shaft, 5, 5 is a flexible crossover wire that connects the commutator 4 and the winding coil 3, and normally the enamelled wire of the coil 3 is connected to the commutator 4 as is. Ru.

To carry out the present invention, the armature is rotated, the winding coil is impregnated with an ordinary thermosetting varnish, and an ultraviolet sensitizer is added to the varnish between the coil and the commutator. Drop the UV heat-curable varnish. Thereafter, the drop-applied varnish is precured by ultraviolet irradiation, and then the armature is heat treated to final cure the entire varnish by heating. In this case, since the surface portion of the varnish adhered between the commutator and the coil has already been radically polymerized by the radicals of the sensitizer caused by ultraviolet irradiation, there is almost no heat fluidization in the adhered varnish, and therefore, its outflow cannot be prevented. , the amount of varnish applied can be maintained as is.

Thus, the crossover wire can be hardened with a sufficient amount of hardened varnish, and the crossover wire can be strongly fixed against the rotational centrifugal force described above.

In the present invention, an ultraviolet sensitizer can also be added to the varnish with which the coil is impregnated.

As mentioned above, the surface of the ultraviolet heat-curable varnish attached between the commutator and the coil has already been hardened by radical polymerization caused by ultraviolet irradiation when the armature is heat-treated. The interior of the varnish is cured, but the heat-cured varnish portion only becomes fluidized before being gelled. When this fluidization is significant, there is a risk that the thickness of the adhered varnish may vary depending on the weight of the varnish, and it is desirable to use a varnish with as high a viscosity as possible. Therefore, it is desirable to use a chiktotropic varnish that can be applied uniformly even when the viscosity is high. In this case, the base varnish may be a coil-impregnated varnish or another varnish; for example, silicic anhydride (commercially available Microparticle silica, Aerosil 380 manufactured by Nippon Aerosil Co., Ltd.) can be added, and to increase the viscosity, for example, glycerin can be added.

Example 1 Varnish A Unsaturated polyester (Nitto Electric Industry Co., Ltd. MV-553)
: 10 parts by weight of hardening agent
After preheating the armature (100V/5 A class) at 130°C for 20 minutes, apply the above varnish A to the coil at a rotation speed of 20 rpm. After that, both the impregnating varnish and the adhering varnish were irradiated with ultraviolet rays for 2 minutes using two IKW lamps. After this irradiation, the armature was Heat treatment was performed at 130°C for 30 minutes.

Example 2 Varnish B Unsaturated polyester (same as above): 1001111s
Heat curing agent (same as above) = 1fis varnish C Unsaturated polyester (same as above): 100ii
ifi heat curing agent (same as above) = 1fis
Thickener (glycerin): 1Mm Example 1
In contrast, the coil was impregnated with varnish B by dropping instead of varnish A, and varnish C was dropped between the commutator and the coil instead of varnish A, and the ultraviolet irradiation conditions were set to 2 KW lamp, 2 The conditions were the same as in Example 1 except that the lamp was turned on for 2 minutes.

Comparative Example: The above-mentioned normal varnish B was used as the varnish impregnated with carp fire and the varnish adhered between the commutator and the coils, and the following information was given regarding preheating, armature rotation speed, varnish dripping amount (impregnation amount and adhesion amount), armature heat treatment, etc. The same as in Example 1 was used.

For the above example quantities and comparative example products, the armature was 120
When the comparative example product was rotated at high speed at °C and inspected for the presence or absence of lifting of the crossover wire, it was found that the comparative example product had a
Although lifting occurred at 33.m for both Example Amount 1 and Example Amount 2. No abnormality was observed in OOOrpm.

[Brief explanation of the drawing]

The drawing is an explanatory diagram showing the armature. In the figure, 3 is a winding coil, 4 is a commutator, and 5.5 is a crossover wire.

Claims (1)

[Claims] jl) Impregnating the coil of the armature that connects the commutator and the coil with a crossover wire with varnish, attaching the varnish between the commutator and the coil, and then heat-treating the armature. In the method of curing the varnish, at least an ultraviolet curing varnish is used as the varnish to be deposited between the commutator and the coil, and the varnish is cured by ultraviolet irradiation, and then the armature is subjected to the above heat treatment. An armature varnish treatment method characterized by: (2) The armature varnish treatment method according to claim 1, characterized in that the ultraviolet curing varnish applied between the commutator and the coil is given a tinge-to-tropic property.