JPH058646Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention This invention relates to a rotary solenoid that operates to change the direction of a flapper disposed in the banknote conveyance path of an automatic teller machine used in, for example, banking operations.

(b) Background of the invention Conventionally, the rotary solenoid of the above example was
For example, there are rotary solenoids shown in FIGS. 6 and 7, and rotary solenoids shown in FIGS. 8 and 9.

The rotary solenoid shown in Figures 6 and 7 is
A permanent magnet 63 is fitted into a shaft 62 which is supported between bearings 61 and 61, and rotor poles 64 and 65 are integrally attached to both ends of this permanent magnet 63, and a pair of yoke tooth portions 6 formed on a yoke 66 are attached.
7, 68 are provided, and these yoke tooth parts 67, 68 are opposed to each other with the permanent magnet 63 in between, and the coil winding parts 69,
It is a rotary solenoid in which a single coil 71 is wound around a coil 70.

In this rotary solenoid, when the above-mentioned coil 71 is energized from the original position shown in FIG. 6 to magnetize the yoke teeth 67 and 68 to the N and S polarities shown in the figure, the permanent magnet 63 rotates clockwise. Then, the rotor pole 64 and the rotor pole 65 stop at a position close to the coil winding part 70 and a coil winding part 69, respectively.

Each of the above elements is 69, 65, 63, 64, 70
The first action position is the position arranged in the order of 69, 64, 63, 65, 70.
When the energization below the action position is canceled and the above-mentioned coil 71 is energized with the positive and negative polarities reversed, the rotor 72 consisting of the above-mentioned elements 63, 64, and 65 is rotated counterclockwise. A second action position can be obtained.

On the other hand, the rotary solenoid shown in FIGS. 8 and 9 has a shaft 82 bearing between bearings 81 and 81.
A rotor 84 made of permanent magnets 83 is fitted into the
A pair of yoke teeth 86, 8 formed on the yoke 85
7, these yoke teeth portions 86 and 87 are opposed to each other with a rotor 84 in between, and a coil 89 is wound around the coil winding portion 88 of the yoke 85 described above.

In this rotary solenoid, when the above-mentioned coil 89 is energized from the original position shown in FIG. 8 to magnetize the yoke teeth 86 and 87 to the N and S polarities shown in the figure, the permanent magnet 83 rotates clockwise. Then, the N pole of the permanent magnet 83 is stopped at a position close to the S pole of the yoke tooth portion 86, and the S pole of the permanent magnet 83 is close to the N pole of the yoke tooth portion 87.

Assuming that this state is the first action position, in order to obtain the second action position which is arranged in the opposite direction, the energization below the first action position is canceled and the above-mentioned coil 89 is energized with the polarity reversed. Therefore, it is preferable to rotate the rotor 84 counterclockwise.

However, the conventional rotary solenoid described above has the following problems.

That is, the inner surface of the yoke tooth portions 67, 68, 86, 87 of each rotary solenoid described above is connected to the rotor 7.
2 and 84, the self-holding torque at the rotor starting position and rotation end position is small, as shown by the dotted line b1 in FIG. There was a problem in that sufficient starting torque and rotational torque could not be obtained even when electricity was applied.

(c) Purpose of the invention The object of this invention is to provide a rotary solenoid that can improve the above-mentioned self-holding torque and can obtain sufficient starting torque and rotational torque.

(d) Structure of the device This device consists of two opposing yoke teeth,
A rotary solenoid is provided with a rotor that rotates between the opposing yoke teeth, the rotor having a central portion rotatably supported and having magnetic poles at both ends; Each of the yoke teeth has an inner circumferential surface that faces both magnetic poles of the rotor at a constant distance, and each of the yoke teeth has an inner circumferential surface that faces the magnetic poles of the rotor. A protrusion having a semicircular cross section that protrudes toward the rotor is formed at a starting position and a rotation end position of the rotor, and a rotation range of the rotor is regulated by contact of the rotor with the protrusion. It is characterized by

(e) Effects of the invention According to this invention, the two yoke teeth have inner circumferential surfaces that face both magnetic poles of the rotor with a constant distance between them, so that the magnetic flux density within the gap remains high and stable. However, this stabilizes the rotation torque regardless of the rotation angle.

In addition, by providing protrusions with semicircular cross sections on the opposing inner peripheral surfaces of each of the two yoke teeth,
The cross-sectional area of the magnetic path that passes through the yoke teeth and reaches the tip of the yoke teeth increases, and the magnetic resistance of the magnetic path decreases. Therefore, damage to the magnetic flux at the tip of the yoke tooth portion is reduced compared to the conventional case, so the magnetic flux density between the magnetic poles of the rotor and the tip of the yoke is improved, and rotational torque is increased.

Furthermore, magnetic flux is concentrated at the protrusions of the yoke teeth, forming magnetic poles against which the magnetic poles of the rotor abut. When the two magnetic poles are in contact with each other, attractive and repulsive forces act, thereby increasing the holding torque and starting torque.

That is, at the rotation end position of the rotor, the rotor comes into contact with the protrusion that is a part of the yoke and is attracted to each other by the magnetic pole force, so that a larger self-holding torque than before can be obtained. Furthermore, at the starting position, a repulsive force acts from the state in which the magnetic poles of the rotor and yoke are in contact with each other, so a larger starting torque than before can be obtained.

Moreover, in the present invention, since the cross section of the protrusion is semicircular, the contact area with the rotor is very small, so even if the protrusion and the rotor become stuck due to not operating for a long time, etc. The fixing force is small, and combined with the above-mentioned strong starting torque, there is an effect that recovery is easy.

(F) Embodiment of the invention An embodiment of the invention will be described below in detail based on the drawings.

The drawings show a rotary solenoid, and in FIGS. 1 and 2, this rotary solenoid rotatably supports a shaft 4 between left and right holders 1 and 2 via bearings 3 and 3. A rotor 6 made of permanent magnets 5 is fitted into the rotor 6.

Further, a yoke 7 is disposed between the left and right holders 1 and 2, and two yoke teeth 8 and 9 facing each other are integrally formed on this yoke 7, and the gap between the opposing yoke teeth 8 and 9 is integrally formed with the yoke 7. The above-mentioned rotor 6 is configured to rotate.

On the other hand, a coil winding part 11 is integrally formed on the upper part of the above-mentioned yoke tooth parts 8 and 9 that form the rotor installation space 10, and this coil winding part 11 has a magnetic field directly proportional to the number of turns and the current value. A generating coil 12 is wound around it.

In addition, at opposing positions on the inner surfaces of the two yoke teeth 8 and 9, there is a protrusion having a semicircular cross section that comes into contact with the outer shape of the rotor 6 when the rotor 6 starts up and when the rotation ends. 13 and 14 are each integrally formed.

The illustrated embodiment is configured as described above,
The action will be explained below.

In the original position shown in FIG. 3 before startup, and when the coil 12 is not energized, the yoke teeth 8, 9 and the protrusions 13, 14 are not magnetized, so the rotor 6 made of permanent magnets is not magnetized. It is in contact with the protrusions 13 and 14.

When the coil 12 is energized to magnetize the yoke teeth 8, 9 and the protrusions 13, 14 to the N and S polarities shown in the figure from the state shown in FIG. 3 before starting, the protrusions 13, 14 and The rotor 6 rotates clockwise due to the repulsive force between the same poles with the permanent magnet 5, and after passing through the state shown in FIG.
Due to the attractive force between different polarities, the rotor 6 further rotates clockwise, and as shown in FIG.
It stops at the rotation end position where the S pole of the projection 13 contacts the N pole of the protrusion 13, and a holding torque is generated.

In order to change from the state shown in FIG. 4 to the state shown in FIG. 1 and then to the state shown in FIG. 3, it is preferable to reverse the direction of current supply to the coil 12.

In this way, when the coil 12 is not energized, the metal protrusions 13 and 14 and the permanent magnet 5 of the rotor 6 are in line contact with each other, so that the solid line a in FIG.
1, the rotor starting position (see Figure 3),
This has the effect of improving the self-holding torque at the rotation end position (see FIG. 4).

In addition, when the coil 12 is energized, the protrusions 13 and 14 and the rotor 6 are connected to each other, as shown by the solid line a2 in FIG.
By generating a repulsive force between the same poles with the permanent magnet 5, a large starting torque can be obtained, and the rotor 6
Due to the rotation of the permanent magnet 5 of the rotor 6 and the protrusion 1
There is an effect that sufficient rotational torque can be obtained by generating an attractive force between different poles.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, in which Fig. 1 is a front view of the rotary solenoid, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a front view of the rotary solenoid at startup, and Fig. 3 is a front view of the rotary solenoid. Figure 4 is a front view of the rotary solenoid at the end of rotation, Figure 5 is a characteristic diagram showing the relationship between torque and operating angle, and Figure 6 is a characteristic diagram showing the relationship between torque and operating angle.
The figure is a front view of a conventional rotary solenoid, FIG. 7 is a sectional view taken along the - line in FIG. 6, FIG. 8 is a front view of a conventional rotary solenoid, and FIG. It is a diagram. 5...Permanent magnet, 6...Rotor, 8, 9...Yoke teeth, 13, 14...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A rotary solenoid comprising two opposing yoke teeth and a rotor that rotates between the opposing yoke teeth, the rotor having a central portion that rotates. The rotor is rotatably supported by a shaft and has magnetic poles at both ends, and the two yoke teeth have an inner circumferential surface facing both magnetic poles of the rotor at a constant distance. On the opposing inner peripheral surfaces of each of the yoke teeth,
A protrusion having a semicircular cross section that protrudes toward the center of the rotor is formed at a starting position and a rotation end position of the rotor, and a rotation range of the rotor is defined by a range in which the rotor contacts the protrusion. A rotary solenoid characterized by being regulated by.