JPS638817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotor for a self-excited generator used as a portable engine generator, for example. This invention relates to a magnetic powder applicator for field iron cores that applies magnetic powder.

The applicant has previously proposed that on the outer peripheral surface of the magnetic pole part of the field core,
We have proposed a rotor in which magnetic particles are coated and fixed with a binder to form a thin layer of magnetic particles, thereby obtaining extremely stable residual magnetism and improving the rise characteristics of the initial output voltage of the generator.

In this case, since there is only a gap of about 0.3 to 0.5 mm between the magnetic pole part and the air gap part facing it, the magnetic powder layer must be formed extremely thin to a thickness of about 0.05 to 0.0 mm. If the work is done manually, such as by brush painting, not only is the work efficiency low, but it is also difficult to always form a magnetic powder layer with a uniform thickness, and the quality tends to be unstable.

In view of the above, the present invention provides a magnetic powder coating machine that automatically performs magnetic powder coating on the outer circumferential surface of a magnetic pole part, improves coating efficiency, and makes the thickness of the magnetic powder layer uniform at all times to stabilize quality. The purpose is to

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a storage tank in which magnetic particles 2 of barium ferrite, strontium ferrite, etc. are accommodated, and the magnetic particles 2 are coated with thermosetting ink or insulating varnish as a binder. etc. to give it adhesive properties. Also, in the storage tank 1 there is a coating roller 3.
is rotatably supported with a part of its outer peripheral surface immersed in the magnetic powder 2, and a drive shaft of a drive motor 5 is connected to one end of the rotation shaft 4.

Above the coating roller 3, a pair of fixed arms 6 protrude inward from the opening edge of the storage tank 1 in a relationship perpendicular to the rotating shaft 4.
A set of support rollers 7 is rotatably supported.
At the opening edge of the storage tank 1, a hook-shaped bracket 8 projects upward from between the base ends of each arm 6, and a hydraulic cylinder 9 as a lifting mechanism is attached to the top surface of the tip of the horizontal portion 8a with its piston rod 10 facing downward. ing. An inverted U-shaped movable arm 11 is fixed to the lower end of the piston rod 10, and one pressure roller 12 is rotatably supported at each lower end of the arm 11. Each pressure roller 12 is arranged so as to always be located above the intermediate portion of each pair of support rollers 7. One of the four supporting rollers 7 is driven by a drive motor 14 via a transmission shaft 13.

Below the fixed arm 6, a magnetic particle blocking plate 15 is provided inwardly protruding from the storage tank 1.
The tip end of the coating roller 3 contacts the surface of the coating roller 3 in the direction of the generatrix of the outer peripheral surface thereof. A leveling plate 16 for uniformizing the coating thickness of the magnetic powder 2 is fixed to the upper surface of the blocking plate 15 with screws 17. The screw insertion holes 18 of the leveling plate 16 are formed into elongated holes, so that the leveling plate 16
is configured to be able to move forward and backward relative to the outer peripheral surface of the magnetic pole portion of the field core, which will be described later, so that the coating thickness of the magnetic powder 2 can be adjusted. In addition, the end portions of the blocking plate 15 and the leveling plate 16 create a V between them.
A letter-shaped magnetic powder reservoir 19 is formed.

The field core C is made by laminating many plate-shaped bodies.
It consists of a field coil winding part B and a pair of magnetic pole parts P having convex arc-shaped outer peripheral surfaces located at both ends thereof, and the field coil winding part B is fitted into the middle part of the rotor shaft S. There is.

When applying the magnetic powder 2 to the outer circumferential surface of the magnetic pole part P of the field core C, drive the drive motor 5 of the coating roller 3 to rotate the coating roller 3 clockwise in FIG. The magnetic particles 2 are attached between the exposed starting end of the magnetic particles 2 and the contact portion with the blocking plate 15, and the magnetic particles 2 are stored in the magnetic particle reservoir 19. In order to maintain the adhesion and accumulation of magnetic particles 2 at all times during the coating operation, the coating roller 3 is constantly rotated during the coating operation.

At the start of coating work, the movable arm 11 and the pressure roller 12 are raised, so both ends of the rotor shaft 4 are bridged between the two sets of support rollers 7, and the piston rod 10 of the hydraulic cylinder 9 is extended. The pressure rollers 12 press the outer circumferential surfaces of both ends of the rotor shaft S against two sets of support rollers 7, respectively. As a result, the field core C is positioned above the coating roller 3 and close to its outer peripheral surface.

After that, when the drive motor 14 of the support roller 7 is driven to rotate one support roller 7, the rotor shaft S rotates counterclockwise in FIG. Rotate in the direction
The outer circumferential surface of the magnetic pole part P is coated with the outer circumferential surface of the coating roller 3 and the magnetic powder 2 from the magnetic powder reservoir 19, and the excess is scraped off by the leveling plate 16, so that the outer circumferential surface of both magnetic pole parts P has a uniform thickness. For example, a magnetic powder layer 2' with a=0.05 to 0.1 mm is formed. In this case, since the magnetic powder 2 is always stored in the magnetic powder reservoir 19, the application of the magnetic powder 2 to the magnetic pole portion P is performed reliably and efficiently.

After the magnetic powder layer 2' is formed on the outer peripheral surface of both magnetic pole parts P, the drive motor 14 of the support roller 7 is stopped at a position where they do not come into contact with the coating roller 3, and the piston rod 10 of the hydraulic cylinder 9 is contracted to remove both pressure rollers. 12 from the outer peripheral surface of the rotor shaft S. Thereafter, the field core C is removed, the magnetic powder layer 2' is heated and hardened, and it is fixed to the outer peripheral surface of the magnetic pole part P.

In addition, when insulating varnish is used as a binder,
In the rotor manufacturing process, after a field coil is wound around a field iron core, an insulating varnish is applied to the coil part, and then magnetic powder is applied to the outer peripheral surface of both magnetic pole parts in the above process, and then an insulating varnish is applied to the coil part and the magnetic powder layer. It can be cured with a single heat treatment, and is therefore effective in improving work efficiency and improving economic efficiency.

In addition, insulating varnish has sufficient mechanical adhesion strength to firmly bond the magnetic particles to each other and the outer peripheral surfaces of the magnetic pole parts of magnetic particles.Also, insulating varnish has excellent heat resistance, so the rotor generates heat during power generation. However, the magnetic powder layer will not peel off, and insulating varnishes of various viscosities are commercially available, so if it is necessary to increase the blending ratio in order to fully demonstrate the characteristics of the magnetic powder, it is necessary to increase the blending ratio. There are advantages such as being able to easily select a suitable insulating varnish.

As described above, according to the present invention, a magnetic powder applicator for a field core is provided with two sets of support rollers that support both ends of a rotor shaft having a field core; at least 1
a pressing roller; an elevating mechanism that raises and lowers the pressing roller relative to the support roller; a drive motor that rotationally drives at least one of the supporting roller and the pressing roller to rotate the field core; ; a storage tank disposed below the field core and containing magnetic powder mixed with a binder; and a coating roller having a part of its outer peripheral surface immersed in the magnetic powder and rotatably disposed within the storage tank. a drive motor that rotates the application roller to apply the magnetic particles attached to the outer circumferential surface of the roller onto the outer circumferential surface of the magnetic pole portion of the field iron core; Since it is composed of a leveling plate that can be used to uniformly apply the coating thickness, it is possible to automatically apply magnetic powder to the outer circumferential surface of the magnetic pole part of the field core, making the application process extremely efficient. This makes it possible to scrape off excess magnetic particles on the outer circumferential surface of the magnetic pole part, keep the coating thickness uniform, and stabilize quality. Further, since the field core can be attached to and detached from the applicator by raising and lowering the pressure roller using the elevating mechanism, the attachment and detachment work can be performed extremely easily. Furthermore, since the field core is rotated by rotationally driving at least one of the pressure roller and the support roller by the drive motor, the field core rotation mechanism is simple and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of one embodiment of the present invention;
The figure is a sectional view taken along the line of FIG. 1, and FIG. 3 is an explanatory diagram of the arrangement relationship among the coating roller, field core, blocking plate, and leveling plate. C... Field iron core, S... Rotor shaft, P... Magnetic pole part, 1... Storage tank, 2... Magnetic powder, 3... Coating roller, 5... Drive motor, 7... Support roller, 9...
... Hydraulic cylinder as a lifting mechanism, 12 ... Press roller, 14 ... Drive motor, 16 ... Leveling plate.

Claims (1)

[Claims] 1 two sets of support rollers that support both ends of a rotor shaft having a field core; at least one pressure roller that presses both ends of the rotor shaft against the support roller; an elevating mechanism that moves up and down with respect to the support roller; a drive motor that rotationally drives at least one of the support roller and the pressing roller to rotate the field core; disposed below the field core; a storage tank containing magnetic powder mixed with a binder; a coating roller having a part of its outer peripheral surface immersed in the magnetic powder and rotatably disposed within the storage tank; rotating the coating roller; a drive motor that applies the magnetic particles adhering to the outer circumferential surface of the roller to the outer circumferential surface of the magnetic pole part of the field iron core; and a leveler that scrapes off the excess magnetic powder applied to the outer circumferential surface of the magnetic pole part to make the coating thickness uniform. A magnetic powder applicator for field cores consisting of a plate and;