JPS60101901A - Manufacture of multilayer iron core - Google Patents

Abstract

PURPOSE:To prevent invasion of metal plate treatment liquid between layers by previously vacuum-impregnating insulation resin on the end surface of a multilayer iron core. CONSTITUTION:A wound iron core 1 is vacuum-impregnated with insulation resin, completely hardened and then the end surface of the iron core is ground, plated with materials such as Zn and coated with an anticorrosive film 3. This construction prevents invasion of acid liquid of preplating treatment agent, alkaline plating liquid, etc, into the wound iron core and the life or the strength of the anticorrosive film 3 can be extended or increased.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a multilayer core such as a wound core 1 used as an electromagnet fixed core and a movable core of a brake part of an electric motor with a brake, in which the abutment surface of the end face, that is, This invention relates to a method for manufacturing a multilayer core that makes it possible to increase the life expectancy of the metal plating film applied to the suction surface.

rTechnical background of the invention and its problems] Forcibly braking the rotation due to inertia after the electric motor stops energizing (
Some electric motors with brakes use electromagnets to obtain braking force.

If such a motor with brakes and brakes is used in an environment of high temperature and humidity where the ambient temperature changes rapidly in a short period of time, and the braking operation is performed infrequently, for example, 2 to 3 times a month, the fixed iron core for the electromagnet and The suction surface of the movable iron core corrodes and rusts, making it impossible for the motor to operate normally. For this reason, the suction surfaces of both cores are treated with anti-corrosion treatment such as metal plating.

In addition, when using an AC power source to excite the electromagnet, the abutting surfaces, that is, the attracting surfaces at both ends of the iron core, should be protected against corrosion (rust prevention) between the electromagnet fixed core and the movable core to prevent electromagnetic noise. For example, zinc plating was directly applied as the metal plating to form the film.

The method for obtaining the above-mentioned anticorrosive coating is to pickle the wound core, immerse it in a plating bath, and form a highly anticorrosive coating such as metal plating on the adsorption surface, which is the end surface of the wound core, by electrolytic action. I have to.

However, in this method, an acidic solution such as @acid or nitric acid used in the pre-plating treatment infiltrates into the core through the gaps between the layers of the wound core, and is not completely removed even after drying. Therefore, after the adsorption surface of the wound core was plated, the acidic liquid accelerated the corrosion of the wound core, eventually destroying the metal plating film as an anti-corrosion coating. Additionally, the alkaline liquid used during the plating process may remain inside the wound core during the plating process, swell due to changes in ambient temperature, and destroy the metal plating surface over time. This has the disadvantage that peeling phenomena occur and the life of the metal plating film is shortened.

[Object of the Invention] The present invention has been made based on the above circumstances, and its purpose is to prevent various liquids used in the metal plating process of the end face of a multilayer core from entering between the core layers. ,
To provide a method for manufacturing a multilayer iron core that makes it possible to extend the life of a metal plated object.

[Summary of the Invention] The method for manufacturing a multilayer core according to the present invention includes vacuum impregnating the multilayer core with an insulating resin agent before the metal plating process on the end face of the multilayer core, and applying various types of materials used in the metal plating process. The feature is that the liquid is made p to prevent the liquid from penetrating between the layers of the multilayer iron core.

[Embodiments of the Invention] A first embodiment of the method for manufacturing a multilayer core according to the present invention will be described below.
This will be explained with reference to the figures. In FIG. 1, reference numeral 1 indicates a movable core of an electric motor with a brake to which this embodiment is applied. This movable core 1 is a so-called wound core formed by winding iron plates, and the iron plates are formed in multiple layers. has been done. This movable iron core 1 is fixed to a mounting member 2, and is installed in an electric motor with a brake as shown in FIG.

In this embodiment, first, an iron plate is wound to produce a wound core as a multilayer core. Next, in step (1), this wound iron core is immersed in a resin or varnish solution as an insulating resin agent in a vacuum tank to perform vacuum impregnation. Next, in step (2), the resin or varnish is dried until it is completely cured. Next, in step (3), the suction surface of the end face of the wound core is lathed or ground. Next, in step (4), metal plating such as zinc plating is applied to the suction surface of the wound core, and an anticorrosive coating 3 is formed on the suction surface (end surface) of the wound core to complete the movable core 1.

According to the above example, since the wound core was impregnated with resin or varnish in a vacuum tank in step (1), the resin and varnish penetrated deep into the core through the gaps between the layers of the wound core, and then in step (21) hardening and drying. Resin and varnish are filled into the gaps of the wound core.Therefore, in step (4), an acidic liquid such as sulfuric acid or nitric acid is used as a plating pretreatment agent to be used when metal plating the adsorption surface of the wound core, and metal plating is performed. To prevent alkaline liquid etc. used during processing from entering the inside of the wound core,
It becomes possible to block the filled resin or varnish with J:.

As described above, in this example, since the resin or varnish was vacuum impregnated into the wound core before metal plating, the plating solution was prevented from entering through the gaps in the wound core.
Therefore, when using the iron core, sulfuric acid, which is a pre-plating treatment agent,
The degree of corrosion of the anticorrosive coating 3 by acidic liquids such as nitric acid can be reduced. In addition, the alkaline liquid used during the plating process is blocked from entering the interior through the gaps in the wound iron core in a manner similar to 1O1, and therefore the degree of destruction of the anticorrosive liquid Ill3 is reduced. The time for the peeling phenomenon to occur can be delayed, and the life and strength of the anticorrosion coating 3 can be improved.

Next, the above embodiment is applied to a fixed core of an electric motor with a brake, and a specific example of an electric motor with a brake equipped with these fixed cores and a movable iron core will be described with reference to FIG.

That is, in FIG. 2, reference numeral 4 indicates a fixed core made of a wound core, and a coil is wound around the fixed core to form an electromagnet. The movable iron core 1 and the fixed iron core 4 have their end faces, that is, the suction surfaces, subjected to anti-corrosion treatment as explained in the above embodiment.

5 is the brake spring, 6 is the brake frame, and 7A.

7B is a brake lining, 8A and 8B are brake shoes fixed to the movable iron core 1 via a mounting member 2, 9 is a shaft of the electric motor, and 10 is the brake shoe 8A, 8B.
G41 is a gap that stops when the power of the electromagnet is released.

Next, the operation of the electric motor with a brake will be explained.

When the power is not turned on, the brake shoes 8A and 8B are pushed to the right in the drawing by the spring force of the brake spring 5, and as a result, the brake lining 7A is pressed against the brake frame 6, and the brake lining 7B is restrained and the shirt ] to 9 are stopped rotating. When starting, when power is applied to the electric motor and electromagnet, the winding of the electromagnet is energized, and the movable iron core '1 facing the end face of the fixed iron core 4 overcomes the spring force of the brake spring 5. Only gap G is attracted. This spring force drives the brake shoes 8A, 8B to the left in the drawing, and the brake lining 7A, which was restrained during the above-mentioned braking,
, 7B, removing the braking action on the shaft 9, which causes the shaft 9 to rotate. Conversely, during a stop operation, if the power supply between the electric motor and the N magnet is opened, the attractive force of the electromagnet disappears, and the movable iron core 1 and brake shoes 8A, 8B
The brake linings 7A and 7B are separated by the force of the brake spring 5 and driven rightward in the drawing, and the brake linings 7A and 7B are connected to the brake frame 6 and the brake shoe 8A.

8B, and due to the braking force generated during this sandwiching, the shaft 1-0 of the electric motor rapidly stops its rotation due to the )n property.

As described above, by applying this embodiment, the electric motor with a brake equipped with the movable iron core 1 and the fixed iron core 4 that prevents the acidic liquid and alkaline liquid used in the metal plating process from penetrating into the interlayers of the wound iron core, Since the acidic liquid and alkaline liquid are not present on the adsorption surfaces of the iron core 1 and the fixed iron core 4, that is, on each end surface, the metal plating coating surface as an anticorrosion coating is protected and the anticorrosion function is maintained for a long time. No noise is generated, and the suction surface can remain good for a long time. In addition, since the above-mentioned acidic and alkaline liquids are not present, the above-mentioned electric motor with a brake can withstand use even under adverse environments and conditions such as high temperature and humidity, rapid changes in ambient temperature for a short period of time, and infrequent use. This is extremely advantageous.

[Effects of the Invention] As described above, in the method for manufacturing a multilayer core according to the present invention, before the step of metal plating the end face of the multilayer core, the multilayer core is vacuum impregnated with an insulating resin agent, and the metal plating is performed by vacuum impregnating the multilayer core with an insulating resin agent. Since various liquids used in the treatment process are prevented from penetrating between the layers of the multilayer core, it is possible to extend the life of the metal plating coating on the end face of the multilayer core.

[Brief explanation of the drawing]

Fig. 1 is a diagram illustrating an embodiment of the method for manufacturing a multilayer core according to the present invention applied to a movable core of an electric motor with a brake, and Fig. 2 is a diagram illustrating a motor with a brake incorporating a 19 movable iron core according to the same embodiment. FIG. 1...Movable iron core, 3...Anti-corrosion coating, 4...Fixed iron core. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] A method for manufacturing a multilayer core, characterized in that the multilayer core is vacuum impregnated with an insulating resin agent before the step of metal plating on the end face of the multilayer core.