JP2714105B2 - Apparatus and method for electrostatic coating of magnetic core - Google Patents

Description

The present invention relates to an electrostatic coating device and an electrostatic coating method for a magnetic core, and more particularly, to an electrostatic coating device and an electrostatic coating device for winding a driving coil of a brushless motor. The present invention relates to improvement of an electrostatic coating method.

(B) Conventional technology Among brushless motors, a so-called circumferentially opposed brushless motor is configured by winding a driving coil around a magnetic core disposed on a stator.

Such a magnetic core 1 is formed by laminating a plurality of punched and formed thin steel plates and integrating them, and also has a plurality of salient pole teeth 3 projecting radially as shown in FIG. A drive coil (not shown) is wound around the salient pole teeth 3. From the viewpoint of preventing corrosion and short-circuiting of the drive wire of the drive coil and improving the appearance, the outer surface is coated except for the central portion. I have. Note that reference numeral 5 in the drawing denotes a projection to be locked on the coating jig. The reason why the coating on the outer surface of the central portion of the magnetic core is excluded is that the central portion is used as a reference surface for attaching other components, attaching the magnetic core to a substrate or the like.

Conventionally, to apply a coating to the magnetic core 1, as shown in FIG. 5, a first support member 7 made of a metal such as aluminum is used.
The center through hole 11 of the magnetic core 1 is fitted into the protrusion 9, and the recess 15 of the second support member 13 formed of the same material as the first support member 7 is inserted into the protrusion 9. Fit into 9,
The central portion of the magnetic core 1 is sandwiched between the flange 17 of the first support member 7 and the distal end surface of the second support member 13, and powder coating is sprayed with the magnetic core 1 charged to perform electrostatic coating. Was.

(C) Problems to be Solved by the Invention However, in the above-described electrostatic coating apparatus and method, productivity is poor because the magnetic cores 1 are coated one by one.

On the other hand, in order to paint a plurality of cores 1 at the same time, it is necessary to paint with a collar member covering the central part of each core between the plurality of cores 1 fitted into one projection 9. However, since the magnetic core 1 is charged and sprayed with a powder coating to perform electrostatic coating, if a metal color member is used, the color member is also electrostatically coated, and even if it is polished, the coating hardly falls off. Difficult to use.

In addition, when a color member made of a synthetic resin having good heat resistance such as a fluorine resin is used, there is a problem that polishing is difficult and the number of reuses is reduced.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such conventional disadvantages, and an object of the present invention is to provide an electrostatic coating apparatus and an electrostatic coating method capable of reusing a color member many times and improving productivity. .

(D) Means for Solving the Problems In order to solve such problems, the present invention provides a first support member and a second support member for clamping a central portion of the magnetic core between the first support member and the first support member. Support members and their first and second
And a ring-shaped collar member made of a hard comb sandwiched between the central portions of a plurality of magnetic cores sandwiched between the support members. Hard silicone rubber is preferable as the collar member.

A plurality of cores are sandwiched between a first support member and a second support member while a ring-shaped collar member made of hard rubber is sandwiched between central portions of the plurality of core cores. The powder coating is sprayed on a plurality of magnetic cores to perform electrostatic powder coating.

(E) Function In the present invention having such means, when the powder coating is sprayed on the magnetic cores, the powder coating adheres except for the central portion of each magnetic core, and electrostatic powder coating is performed.

At this time, the powder paint adheres to the ring-shaped collar member, but since the collar member is made of hard rubber, the adhered powder paint is peeled off by simple polishing and is hardly worn.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings. Note that portions common to the conventional example are denoted by common reference numerals.

1 and 2 are a sectional view and an exploded perspective view showing an embodiment of the electrostatic coating device according to the present invention. The electrostatic coating method will be described with reference to FIG. 1 and FIG.

The first support member 7 is formed by molding a metal material such as aluminum, for example, and has a disk-shaped flange 17 and a small-diameter projection 9 protruding from the center of the flange.

The core 9 as shown in FIG.
A plurality of engagement grooves 19 with which the projections 5 are engaged extend in the axial direction.

Reference numeral 21 denotes a ring-shaped collar member made of hard silicone rubber, and has an inner size that fits in the protruding column 9. This collar member 21 is interposed between the magnetic cores 1 as shown in FIG.

The second support member 13 is formed of the same material as that of the first support member 7, and has a concave portion having an inner diameter substantially equal to the outer diameter of the projection 9.
The end face of the second support member 13 has a depth such that the end face of the second support member 13 contacts the magnetic core 1 as shown in FIG.

Next, a method of coating two magnetic cores 1 using such an electrostatic coating device will be described.

First, the magnetic core 1 is connected to the protrusion 9 formed on the first support member 7 so that the protrusion 5 of the magnetic core 1 is engaged with the protrusion 9.
Fit it.

Then, after the collar member 21 is fitted to the protruding pillar 9, another magnetic core 1 is fitted in the same manner as the magnetic core 1 in which the other core has been previously fitted.

Next, the concave portion 15 of the second support member 13 is fitted into the protruding column 9, the end face of the second support member 13 is brought into contact with the magnetic core 1, and the plurality of first and second support members 7 and 13 are used. Of the magnetic core 1.

In this state, the magnetic core 1 is charged and sprayed with a powder coating material such as an epoxy-based oil and fat, and is passed through a heating atmosphere at about 200 ° C. to melt the powder coating material and perform electrostatic powder coating.

Thereafter, if the first and second support members 7 and 13 are removed and the collar member 21 is taken out and polished with, for example, a barrel grinder, the powder coating adhered to the collar member 21 is easily peeled off.

Although the color member 21 in the present invention is not limited to hard silicone rubber, the object of the present invention can be achieved by using a hard rubber having good heat resistance because of the electrostatic coating through a heating atmosphere.

As the collar member 21, hard silicone rubber is preferable from the viewpoint that the powder paint is easily peeled off and the polishing process is simple.

(G) Effects of the Invention As described above, the present invention provides first and second support members for holding a plurality of cores, and a ring-shaped collar made of hard rubber sandwiched between the plurality of cores. A plurality of magnetic cores are sandwiched between a central portion of the plurality of magnetic cores, and the plurality of magnetic cores are separated by a first support member and a second support member in a state where a ring-shaped collar member made of hard rubber is sandwiched between the core members. Since the electrostatic powder coating is performed while being sandwiched, the paint adhered to the color member is easily peeled off, and the polishing is easy.

Therefore, the collar member can be reused many times, and the electrostatic coating efficiency of the magnetic core is improved.

According to the experiments of the inventor, conventionally, the operation time was 470 minutes and 2
According to the present invention, the result of 500 paintings was 3,200 paintings in the same 470 minutes, and the productivity was improved by 123%.

[Brief description of the drawings]

1 and 2 are a sectional view and an exploded perspective view showing an embodiment of the electrostatic coating apparatus according to the present invention, FIG. 3 is a perspective view showing a collar member of FIG. 1, and FIG. 4 is a magnetic core. Plan view of the
FIG. 5 is a view for explaining a conventional electrostatic coating apparatus and a conventional electrostatic coating method. DESCRIPTION OF SYMBOLS 1 ... Core core, 3 ... Salient pole teeth, 5 ... Protrusion, 7 ... First support member, 9 ... Protrusion column, 11 ... Through hole, 13 ... Second
Support member, 15 ... recess, 17 ... flange, 19 ... engagement groove, 21 ... collar member.

Claims (2)

(57) [Claims] A first support member; a second support member for sandwiching a central portion of a core of the motor between the first support member and the first support member; and a second support member between the first and second support members. And a ring-shaped collar member made of hard rubber sandwiched between central portions of the plurality of cores to be sandwiched. 2. A motor-driven magnetic core, wherein a ring-shaped collar member made of hard rubber is sandwiched between central portions of the plurality of cores by first and second support members. A method for electrostatically coating a magnetic core, wherein a powder coating is sprayed on the plurality of magnetic cores to perform electrostatic powder coating.