JPS60102870A - Eddy current brake device - Google Patents

Abstract

PURPOSE:To obtain a substantially constant brake torque in a range of wide rotating speed of a disc by arranging at least a pair of poles so as to be displaced in the rotating direction at both sides of the rotational shaft direction of the disc. CONSTITUTION:A disc 2 is secured to a rotational shaft, and poles 3 are arranged oppositely to the both side surfaces of the disc 2. The poles are supported to a supporting frame 5, and have exciting windings 4. The poles 3 are disposed to be displaced in the rotating direction at both sides of the disc 2. The brake torque to the rotating speed of the disc 2 is set to substantially constant value in a wide range of the rotating speed of the disc 2 by regulating the displaced amount in the rotating direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disc type eddy electric brake.

[Prior art]

A conventional disc type eddy current V-key disc is mounted on the transmission shaft (1). (3) is a magnetic pole consisting of one or more pairs, with an air gap on both sides 1 of the disk (2), and when there are multiple pairs of magnetic poles (3), the magnetic poles (3) lined up on the same side of the disk (2) are adjacent to each other. The magnetic poles (3) are arranged so as to have five polarities. (4) is magnetic pole (3)? The field winding to be excited (5) is a magnetic pole frame that supports the magnetic pole (3).

Next, the operation will be explained. Is there a constant DC current in the field winding (4)? A standing magnetic flux distribution is obtained on the stator side by passing each magnetic pole +3). When the disk (2) is rotated through the entire rotating shaft (1) in this standing magnetic flux distribution, a thin current is induced inside the disk (2), and a braking torque is applied to the disk (2). Figure 4 shows the flow of the main magnetic flux when the opposing magnetic layers (2) have the same polarity, and Figure 5 shows the flow of the main magnetic flux when they have different polarities. The broken line indicates the magnetic flux that completely penetrates the disk (2). By adjusting the amount of this penetrating magnetic flux, the main magnetic flux shown by the solid line can be adjusted and the braking torque can be adjusted.

In Fig. 6, curve A shows the braking torque relative to the rotational speed of the disc (2) for an eddy current brake with a different polarity configuration in which the number of magnetic poles (3) is 8 and the pitch between the poles is 45°. This is the characteristic that was actually measured. In addition, the excitation current is 12000A
It is on the T/ pole.

Curve B shows the actual measurement result of braking torque with respect to the rotational speed of the disk (2) when the other conditions mentioned above are kept the same and the polarity is the same.

In the conventional magnetic pole facing arrangement as described above, the rotating speed of the field disk (2) of the same polarity is relatively large (in the range of 1 and 2, the dynamic torque is large, but it has the disadvantage that it becomes concave as the rotating speed increases). , on the other hand, in the case of crystal polarity, it was made to significantly remove 1 degree from the gigantic 11 (yum number ≦ medium), and the 4 i of the disk
In a wide range of numbers, there is a constant system T! v+) at least one pair of magnetic poles for the purpose of providing an eddy current of 14 hours. They are arranged so as to be offset from each other in the rotation direction on both sides in the direction of the rotation axis.

[Embodiments of the invention]

The following is an example of an embodiment of this invention.
S1. 71Z1, s + = Bason Fig. 2,
This corresponds to FIG. 8 and all the reference numerals are the same, so the explanation will be omitted.

In Figure 7 1 and Figure 8, the magnetic pole (3) is the disk (2)
? Conventionally, the magnetic surfaces were completely opposed to each other, but they are now placed offset in the rotational direction. According to experiments, the braking torque with respect to the rotational speed of the disk (2) becomes as shown in FIG. 6C by fully adjusting the amount T even in this direction of rotation.

This characteristic is due to the different polarity arrangement and the magnetic WA on one side of the disk.
*Actually measured values when shifted by 104°.

In addition, in the above embodiment, the field winding (4) is connected to the magnetic pole (3). Place to have 8-? However, even if the magnetic pole (3) is a permanent magnet, is the same effect as in the above embodiment? play.

〔Effect of the invention〕

In this way, according to the present invention, as shown by curve C in FIG. 6, by shifting the opposing magnetic poles in the direction of rotation of the disk, the magnetic field current remains constant over a wide range of disk rotational speeds for a constant field current. This has the effect of providing an eddy current brake that provides braking torque.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional disc type eddy current brake, Figure 2 is a cross-sectional view taken along line ■-■ in Figure 1, taken in the direction of the full arrow, and Figure @8 is a cross-section taken along line 111--■ in Figure 2. A developed view of the circumferential direction as seen in the direction of all the arrows. Figure 4 shows the flow of the main magnetic flux when the opposing magnetic poles have the same polarity. Figure 6 shows the flow of the main magnetic flux when the opposite polarities are set. Figure 6 shows the relationship between the braking force and the rotational speed of the disc, obtained by actual measurements.
FIG. 7 is a diagram showing the arrangement of magnetic poles showing one embodiment of the present invention, and FIG. 11 is a circumferential development view of the old i-plane viewed from the direction of the arrow. FIG. In the figure, C2) is a disk, and (3) is a magnetic pole. In addition, are the same symbols in the figures the same or equivalent parts? show. Agent Masuo Oiwa Figure 1 Figure 3

Claims (1)

[Claims] A disk consisting of a rotating magnetic pole body, and t'b arranged on both sides of the disk in the rotational axis direction so as to be offset from each other in the rotational direction.
At least one pair of magnetic I'C and a total of 9INλ current brakes.