JPH0681475B2 - Rotary solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rotary solenoid generally used for the purpose of obtaining a mechanical rotational force in a constant angle range by an electric force, and particularly to a rotary operation range. The present invention relates to a rotary solenoid that has a so-called latching function of holding the position even when the current is cut off at both ends, and performs a reversing operation depending on the direction of the current flowing to the coil, and can obtain a particularly large rotation angle.

(B) Conventional technology Conventionally, as a rotary solenoid of this type, a part of the outer circumferential surface of the rotor is generally the north pole and a part of the opposite side is the south pole.
This is a method in which a pole is magnetized, a coil is provided on each of two stators facing each other, and the rotor is rotated by energizing this, and the direction is reversed to change the direction of the current.

(C) Problems to be solved by the invention However, in the case of the above-mentioned structure, the maximum rotation angle of the rotor is generally 90 °, and the rotation force at both ends is considerably small. The degree of use will be limited, and the applications will be limited.

(D) Means for Solving the Problems In the present invention, two iron cores fitted with coils are provided on the inner surfaces of both sides of a U-shaped yoke, and the first and second end portions of the two iron cores are respectively provided. A third stator and a second stator are provided on the inner surface of the center of the yoke, and about half of the circular outer surface of the rotor having a circular outer surface facing the first, second and third stators is N
The opposite surface is magnetized to the S pole, and a substantial magnetic gap is provided between the adjacent N and S poles, and the first and third stators have the same polarity and the second stator has the same polarity. The above drawbacks are solved by controlling the energization of the coils so as to simultaneously excite the coils with opposite polarities and controlling the rotation direction of the rotor.

(E) Action The rotary solenoid configured as described above energizes the two coils in opposite directions, and thereby the rotational force and the second force acting on the rotor by the first and second stators.
And the rotational force exerted on the rotor by the third stator continuously act to rotate the rotor by approximately 120 °. To reverse the direction of rotation, the direction of the current flowing through the coil may be reversed.

At both ends of the operating range, the holding torque when the current passed through the coil is cut off is the shape of the rotor and the first and third holding torques.
It can be set to an arbitrary size by changing the shape and width of the stator.

(F) Example The structure of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view showing the structure of an embodiment of the present invention.

In FIG. 1, iron cores 2 and 3 are attached to inner surfaces of both sides of a yoke 1 having a substantially U shape with both ends bent downward, and bobbins 4 and 5 are fitted into the iron cores 2 and 3. Coils 6 and 7 are wound around the bobbins 4 and 5, respectively.

Further, first, second, and third stators 8, 9, and 10 having arc-shaped inner surfaces are provided in order at the tips of the iron cores 2 and 3 and the center of the inner surface of the yoke 1. In addition, the rotor 11 has a circular outer surface and a notch.
12 and 13 and shaft 14 at the center, and one of the circular outer surfaces is N
The pole and the other are magnetized to the S pole, and the material is made of magnet material such as value ferrite. Also,
The length of the magnetized circular outer surface is preferably about 120 ° in circumferential angle. The shaft 14 is supported by the yoke 1 by a bearing and a frame (not shown), and is rotatably supported coaxially with the arc-shaped inner surfaces of the stators 8, 9 and 10.

In FIG. 1, when the coils 6 and 7 are not energized, the magnetized surfaces of the rotor 11, N and S, face the first stator 8 and the third stator 10 equally. Stopped at. However, this state is unstable because it easily rotates in either direction.

Now, assuming that the inner surfaces of the first and third stators 8 and 10 have N poles by energizing the coils 6 and 7 in opposite directions, the inner surface of the second stator 9 has S pole. Then, N of rotor 11
The poles repel the first stator 8 and attract the second stator 9. Further, the S pole of the second stator 9 repels the S pole of the rotor 11, and the third stator 10 attracts this. Therefore, the first, second and third stators rotate the rotor 11 in the clockwise direction.

2 and 3 are front sectional views showing an operating state of an embodiment of the present invention.

In the description of FIG. 1, the state of the rotor 11 rotated clockwise is shown in FIG.

When the currents applied to the coils 6 and 7 are cut off in the state shown in FIG. 2, the N pole of the rotor 11 and the second stator 9 and the S pole of the rotor 11 and the third stator 10 are attracted to each other and stopped. There is.

Next, when trying to rotate counterclockwise, the directions of the currents flowing through the coils 6 and 7 in the state shown in FIG. 2 are opposite to those in the case shown in FIG. Then, the inner surfaces of the first stator 8 and the third stator 10 become S poles, and the inner surfaces of the second stator 9 become N poles. Therefore, the N pole of the rotor 11 is attracted to the first stator 8 and repelled by the second stator 9.
The south pole of the rotor 11 is repelled by the third stator 10. From the position of the rotor 11 shown in FIG. 2 to the position shown in FIG. 1, the force generated by the first stator 8, the second stator 9 and the N pole of the rotor 11 causes the rotor 11 to rotate counterclockwise. The repulsive force acting between the third stator 10 and the S pole of the rotor 11 does not contribute to the rotational force.

Next, in the state of FIG. 1, the second stator 9 and the rotor 11 are
Attracting force with the S pole and the stator 10 and rotor 11 of FIG.
The repulsive force with the S pole becomes the rotational force and rotates the rotor 11 counterclockwise to the position shown in FIG.

When the current of the coils 6 and 7 is cut off at the position shown in FIG. 3, the north pole of the rotor 11 and the south pole of the first stator 8 and the rotor 11
It is stopped by attracting each other with the stator 9.

FIG. 4 is a front sectional view showing the structure of another embodiment of the present invention.

In FIG. 4, the north and south poles of the rotor 11 are shown in FIG.
It is slightly wider than 120 ℃. With this arrangement, when the rotor 11 rotates clockwise and reaches the position shown by the dotted line, the end of the S pole reaches the first stator 8 and is cut off by energizing the coils 6 and 7. Since the suction force is generated between the two, the rotor 11 always receives the rotational force in the clockwise direction. If the rotor 11 is stopped at this position by a stopper (not shown), the rotor 11 has a self-holding force due to the rotational force. If the rotor 11 rotates in the opposite direction, N of the rotor 11
The pole and the third stator 10 generate counterclockwise rotational force by the same action as described above, and have the same self-holding force. The magnitude of this self-holding force is proportional to the amount of overlap between the first or third stator 8 or 10 and the N pole or S pole of the rotor 11, and therefore can be easily set to any value.

FIG. 5 is a front sectional view showing the structure of another embodiment of the present invention.

In FIG. 4, the state in which the north pole and the south pole of the rotor 11 are widened has been described, but as shown in FIG. 5, even if the lower ends of the first and third stators 8 and 10 are extended, substantially the same effect can be obtained. is there.

Further, in FIG. 5, the inner surface of the second stator 9 is substantially flat, but this may be inconvenient in use if the neutral point has a stable state in the state as shown in FIG. Therefore, the neutral point is set to an unstable state so that there are stable points only at both ends of the rotation operating range.

Further, the notches 12 and 13 of the rotor 11 are provided for convenience of explanation, and actually become a circular rotor N
It suffices if there is a magnetic gap between the pole and the S pole.

(G) Effect of the Invention As is clear from the above description, the rotary solenoid of the present invention has a unique method in which three stators are controlled by two coils so that the effective rotation angle can be set to 2 by a simple circuit.
It can be expanded nearly twice, and the direction of rotation of the rotor can be reversed without shifting the timing of the two coils simply by changing the direction of the exciting current. Since there are two coils, the size is the same as the conventional one. The rotor 11 and the first and third stators 8,
There is also a great advantage that the self-holding rotational force can be arbitrarily set only by changing the overlapping amount with 10, and the range of application in the industrial field can be greatly expanded, and the effect is extremely remarkable.

[Brief description of drawings]

FIG. 1 is a front sectional view showing the structure of an embodiment of the present invention, and FIG.
FIG. 3 is a front sectional view showing its operating state, and FIGS. 4 and 5 are front sectional views showing the structure of another embodiment of the present invention. 1 ... Yoke, 2,3 ... Iron core, 6,7 ... Coil, 8 ... First stator, 9 ... Second stator, 10 ... Third stator, 11 ... Rotor, 14 ……shaft.

Claims (1)

[Claims] 1. A substantially U-shaped yoke is provided with two iron cores fitted with coils on both inner surfaces, and first and third stators are provided at the ends of the two iron cores, respectively. A second stator is provided on the inner surface of the center of the yoke, and approximately half of the circular outer surface of the rotor having a circular outer surface facing the first, second and third stators is attached to the N pole and the opposite surface is attached to the S pole. It is magnetized, and a substantial magnetic gap is provided between the adjacent N and S poles.
A rotary solenoid characterized in that the energization of a coil is controlled so as to simultaneously excite the third stator with the same polarity and the second stator with the opposite polarity, thereby controlling the rotation direction of the rotor.