JPS5839256B2 - Kanjiyoutetsushinno Seizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an annular iron core used in electromagnetic brakes, electromagnetic clutches, etc.

Since electromagnetic devices such as electromagnetic brakes are normally excited by direct current, a block iron core is used as the iron core.

However, since the iron core is both magnetic and a good conductor, it acts as a secondary coil for the electromagnetic coil, and when the electromagnetic coil is repeatedly excited intermittently, The eddy current flowing through the iron core has a large effect on the operating characteristics and cannot be ignored.

The present invention has been made in view of the above circumstances, and its purpose is to provide a method for manufacturing an annular core that can avoid the effects of eddy currents and can be manufactured efficiently.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a method of manufacturing an annular core used in electromagnetic brakes will be described below with reference to FIGS. 1 to 4.

1. First, the overall structure of the electromagnetic brake shown in FIG. 1 will be explained.

Reference numeral 1 denotes an annular iron core manufactured as described below, which is disposed concentrically with a rotating shaft 3 via a mounting plate 2.

4 is an annular electromagnetic coil located within the annular core 1; 5;
is an annular friction plate located on this electromagnetic coil 4.

Reference numeral 6 denotes a rotating body fitted onto the rotating shaft 3, and integrally has a spline shaft portion 6a around the outer periphery of one end thereof.

A brake plate 7 is made of a magnetic material such as iron and has a spline hole 7a, and the spline hole 7a is fitted into the spline shaft 6a of the rotating body 6 so as to be movable in the axial direction.

Reference numeral 8 denotes a locking plate attached to the rotating body 6, which determines the limit position of movement of the brake plate 7 in the direction of arrow A.

Reference numeral 9 denotes a leaf spring having one end fixed to the brake plate 7 and the other end pressed against the locking plate 8, which keeps the brake plate 7 in the direction of arrow A.
It is biased in the direction.

As a result, the brake plate 7 is always in contact with the locking plate 8 and is opposed to the friction plate 5 with a predetermined gap therebetween.

For example, when the motor is energized and the rotary shaft 3 is driven to rotate, the brake plate 7 also rotates accordingly.

Then, when the power to the motor is cut off, the electromagnetic coil 4 is simultaneously energized, so that the annular iron core 1 is excited.

As a result, the brake plate 7 is suction-displaced in the direction opposite to the arrow A against the spring force of the leaf spring 9 and slides on the friction plate 5, and as a result of the above, the rotating shaft 3 is braked and immediately stops.

Next, the procedure for manufacturing the annular core 1 will be described based on FIGS. 2 to 4.

The entire outer peripheral surface of the electromagnetic coil 4 is coated with a magnetic material such as synthetic resin 10 in advance.

Two such electromagnetic coils 4 are prepared, and these are firmly fixed to both sides of the annular friction material 11, which is the material of the friction plate 5, by adhesive or the like.

The annular body 12 made of the two electromagnetic coils 4, 4 and the friction material 11 integrated in this way is used as a winding die, and a long iron wire 13 with a circular cross section is wound onto it without any gaps. .

In this case, since the outer diameter of the annular body 12 is larger than the inner diameter, the outer peripheral surface side of the annular body 12 is wound in a single layer.
The inner surface side is wound twice (see Figures 3 and 4).
.

Then, after winding the wire 13 around the entire annular body 12, it is immersed in an insulating material, for example, a synthetic resin in a molten state, and when the resin has spread between the wires 13 without a casing, it is pulled up and solidified, Thus, the wire 13, the annular body 12, and the wire 13 are integrated with each other by the synthetic resin 14.

After this, the entire annular body 12 is moved in a direction perpendicular to its axis.
The friction material 11 is divided into two approximately at the center.

As a result of the above, two annular cores 1 each having an electromagnetic coil 4 and a friction plate 5 integrally therein are formed.

According to this embodiment, the wire rod 13 is wound around the annular body 12 and then integrated with the synthetic resin 14, and then the entire annular body 12 is divided into two in the axial direction. Therefore, one wire 13 is divided into a large number of short wires having a substantially U-shape and becomes discontinuous, so that the influence of eddy currents can be effectively avoided.

Moreover, since the wires are divided into two parts after being unified by the synthetic resin 14, the short wires, which are substantially U-shaped, do not come apart and work efficiency is improved.

When winding the wire 13 around the annular body 12, the inner circumferential surface side is wound twice, so the magnetic flux passing area on the inner circumferential wall side and the outer circumferential wall side of the annular iron core 1 cannot be made the same. Therefore, weakening of magnetic force due to saturation of magnetic flux can be effectively prevented.

In addition, in the above embodiment, the wire rod 13 having a circular cross section was used.
For this purpose, a wire rod 15 having a rectangular cross section may be used as shown in FIG.

Further, in the above embodiment, the annular body 12 in which the two electromagnetic coils 4° 4 and the friction material 11 are integrated is used as the winding form, but another annular frame may be used as the winding form.

Other vehicle inventions are not limited to the embodiments described above and shown in the drawings, and can be implemented with various changes without departing from the gist thereof.

As explained above, the present invention can provide a method for manufacturing an annular core that can avoid the effects of eddy currents and can be manufactured efficiently.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional side view of an electromagnetic brake, FIG. The figure and Figure 4 are enlarged cross-sectional views along the ■-■ line and the EV-EV line in Figure 2,
FIG. 5 is a diagram corresponding to FIG. 3 showing another embodiment of the present invention. In the drawing, 1 is an annular core, 4 is an electromagnetic coil, 5 is a friction plate,
7 is a brake plate, 9 is a leaf spring, 11 is a friction material, 12 is an annular body (form), 13 is an iron wire, and 14 is a synthetic resin (insulator).

Claims (1)

[Claims] 1 After winding a long iron wire around an annular winding form and integrating this with an insulating material to form an iron core material, the iron core material is wrapped around the shaft of the winding form. A method for manufacturing an annular iron core, characterized in that the core is divided into two parts in a direction perpendicular to the core.