JPH0517849Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a rotary solenoid, and particularly to a rotary solenoid that can achieve uniform torque characteristics.

[Prior art and its problems]

Conventionally, for rotary solenoids, the fourth
The casing 21 has a cylindrical shape with one end closed, and a bearing part 22 is formed in the center of the closed end. A groove 21a is formed,
Inside this groove 21a, a stator member 23 is attached which has an annular shape and has a plurality of (six in the embodiment) integrally formed protrusions 24 at predetermined intervals (60° intervals). A stator (pole tooth) 26 is formed by winding a coil 25 around each protrusion 24 of the stator member 23.

Further, a lid member 27 having a bearing portion 28 formed in the center thereof is located at the other open end of the casing 21 to close the other open end of the casing 21.

Inside the casing 21, a bearing 2 located at a bearing portion 22 of the casing 21 is provided.
A shaft 30 is disposed with one end supported by the shaft 30, and the other end of the shaft 30 is supported by a bearing 31 provided in the bearing portion 28 of the lid member 27. One end of the casing 21 is urged toward the lid member 27 by a wave washer 32 provided inside the bearing portion 22 of the casing 21 .

Furthermore, inside the casing 21,
A rotor 33 is attached to a portion of the shaft 30 located inside the space surrounded by the protrusion 24 of the stator member 23, and therefore, the rotor 33 is rotatably supported inside the casing 21. ing.

A slight gap is formed between the rotor 33 and the tips of the protrusions 24 of the stator member 23 provided inside the casing 21, so that each protrusion 24 of the stator member 23 and there When the stators (pole teeth) 26 formed by the wound coils 25 that are opposed to each other are energized as a pair and excited, the rotor 33 is rotated by the excitation action at this time. There is.

However, in the conventional rotary solenoid configured as described above, as described above, the attraction force of the stator 26 generated by energizing the pair of diagonal coils 25 and exciting the stator 26 The rotor 33 was designed to generate torque, and its torque characteristics were as shown by the solid line in FIG.

In this case, the torque used as an actuator is preferably as shown by the broken line in Figure 6, but in order to do so it is necessary to increase the overall suction force, and the stator is large in size. This must be done by increasing the size of the stator or by reducing the gap between the stator and rotor, but these methods have the problem of complicating dimensional control.

The present invention solves the above-mentioned problems of the conventional rotor.The rotor is formed into a rectangular shape, the opposing short sides are curved, and the thickness of the rotor is increased in the longitudinal direction. Furthermore, the stator is disposed to face the upper and lower surfaces of the rotor, and a protrusion is formed on the outside of the upper surface of the stator to face the outer peripheral surface of the rotor at a predetermined gap length. This increases the suction force when the angle between the stator and rotor is large between predetermined positions on the stator, and reduces the suction force when the angle is small to increase the suction force on the rotor as a whole. It is an object of the present invention to provide a rotary solenoid that can uniformize the overall torque characteristics by uniformizing the force.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention disposes a rotor rotatably inside a casing by means of a shaft, the rotor is centered on the shaft in a direction perpendicular to the axial direction of the shaft, and
The rotary solenoid is a rotary solenoid in which a plurality of stators are annularly arranged to face the upper and lower surfaces of the rotor so as to have a predetermined gap length between them and the rotor, and the inside of the casing is closed with a lid member. The rotor is formed into a rectangular shape, the opposing short sides are curved, and the thickness of the rotor is extended in the longitudinal direction to be thick at the center, and further, the upper surface of the stator is formed on the outer side. A means is adopted in which a protrusion is provided that faces the outer circumferential surface of the rotor at a predetermined gap length.

[Effect]

By adopting the above-mentioned means, this invention
When the rectangular rotor is adjacent to the stator,
Since the suction is carried out by both the upper surface of the stator and the protrusions provided on the upper surface of the stator, the suction force can be increased, and the stator is placed opposite both the upper and lower surfaces of the rotor. Therefore, the suction force can be made extremely large, thereby making it possible to make the generated torque uniform regardless of the angular position of the rotor.

〔Example〕

An embodiment of this invention shown in the drawings will be described below.

1 to 3 show an embodiment of the rotary solenoid according to this invention, FIG. 1 is a schematic sectional view showing the whole, and FIG. 2 is a schematic explanatory view showing the relationship between the rotor and the stator. , FIG. 3 is a sectional view showing a cross section of the rotor.

That is, in FIG. 1, a lid member 15 having a shaft insertion hole 15c in the center is located at the open end of a cylindrical casing 1 with one end closed, thereby closing the open end. .

A bearing hole 15b is provided at the peripheral edge of the shaft insertion hole 15c provided in the center of the lid member 15, and the bearing 13 is fitted into the hole 15b. A plurality of circular grooves 15a (four in the embodiment) are provided on the outside of the shaft 13 so as to form an annular shape around the shaft insertion hole 15c.

Further, a hole 9 is provided in the center of the upper surface of the lid member 15.
The disc-shaped stator plate 9 having a hole 9b is connected to the bearing 1 in the center of the lid member 15.
Furthermore, this stator plate 9 is provided with a groove 15 of the lid member 15.
Holes 9a corresponding to a are provided, and these holes 9a
The protrusions 2b of the stator pin 2, around which the coil 4 is wound, are respectively fitted through the bobbin 5 having a U-shaped cross section.

Further, a bearing hole 1b is provided in the center of the upper surface inside the casing 1, and a bearing 14 is fitted into the hole 1b, and further,
At a position corresponding to the circular groove 15a provided in the lid member 15 outside the bearing 14,
A plurality of circular grooves 1a (four in the embodiment) are provided so as to form an annular shape around the center of the bearing 14, respectively.

Further, a disc-shaped stator plate 10 having a hole 10b in the center is disposed on the inner upper surface of the casing 1, with the hole 10b matching the outer periphery of the bearing 14. is provided with holes 10a corresponding to the grooves 1a provided on the upper surface inside the casing 1, and stator pins 3 around which a coil 4 is wound are inserted into these holes 10a via a bobbin 6 having a U-shaped cross section.
The protrusions 3b are respectively fitted.

The shaft 12 supporting the rotor 11 in the center can be rotated by the bearing 14 provided on the upper surface of the inside of the casing 1 and the bearing 13 provided in the center of the lid member 15. In this case, the rotor 11 is formed into a rectangular shape as shown in FIG. 2, and its opposing short sides are formed into a curved shape. As shown in FIG. 3, the wall thickness is thicker at the center in the longitudinal direction, and is set at a predetermined angle α.

Furthermore, protrusions 2a and 3a are provided on the outer side of the upper surfaces of the stator pins 2 and 3, and the protrusions 2a and 3a are
The inner surfaces of a and 3a are curved so as to face the curved short sides of the rotor 11.

The upper and lower surfaces of the rotor 11 are
The upper surface of the stator pin 3 disposed on the casing 1 side and the upper surface of the stator pin 2 disposed on the lid member 15 side face each other with a predetermined gap length, and The outer circumferential surface faces the inner surfaces of the protrusions 2a and 3a provided on the outside of the upper surfaces of the stator pins 2 and 3, respectively, with a predetermined gap length.

Incidentally, one stator 7, 8 is constituted by the stator pin 2, bobbin 5, and coil 4, or by the stator pin 3, bobbin 6, and coil 4.

Next, the effects of the above will be explained.

In the rotary solenoid configured as described above, first, a pair of opposing stator pins of the stator pins 2 and 3 shown in FIG. Another pair of adjacent stator pins is energized, and furthermore, this stator pin is de-energized, and the original adjacent stator pin is energized.

Note that the pair of stator pins shown above refers to the stator pins 2 and 3 located above and below with the rotor 11 in between, and the stator pins 2 and 3 located above and below with the rotor 11 on the side opposite to this set. They are configured as a pair as another set.

By sequentially energizing a pair of adjacent stator pins in this manner, the rotor 11 is rotated about the shaft 12 and held at a desired position.

At this time, the rotor 11 rotates to the right in the direction of the arrow in FIG. When the area decreases and the rotor rotates 90 degrees,
Rotor 11 of stator pin when rotation angle is 0°
At this point, the stator pin is almost entirely covered with the rotor 1.
It is covered by 1.

Next, as the rotation continues (shifting the excitation to zero), the opposing area between the stator pin and the rotor 11 decreases.
At this time, the state is the same as when the initial rotation degree is 0°.

This kind of transition will be repeated as the rotation progresses.

In this case, as shown in Fig. 2, the excitation of the reference stator pins is de-energized at a rotation angle of 90° of the rotor 11 between the set position of the reference stator pins 2 and 3 to the next set position. , when the next adjacent stator pin is energized, as the rotor 11 rotates and approaches the stator pin, the thick center part of the rotor 11 approaches from the thin outer part of the rotor 11. Therefore, the stator pin and gap lengths become smaller, the suction force increases further, and the outer peripheral surface of the rotor approaches the inner surface of the protrusions 2a and 3a provided on the outer side of the upper surfaces of the stator pins 2 and 3. The rotor 11 is even more strongly attracted by the stator pins 2 and 3, and the rotor 11
The torque at the start of rotation between the set positions of the stator pins 2 and 3 increases.

As a result, the curve showing the torque characteristics of the rotor 11 between the set positions of the stator pins 2 and 3 approaches the ideal curve shown by the broken line in FIG.

In the above embodiments, the stator has two poles, but the stator is not limited to this, and it goes without saying that the stator may have two or more poles.

[Effect of idea]

By configuring the present invention as described above, between the set positions of the stator, the stator can strongly attract the rotor at the initial stage when the rotor covers the stator, so the torque at that position can be increased.
Therefore, the torque characteristics can be made uniform, making it possible to achieve a flat state that is almost close to the ideal curve compared to conventional ones, as well as providing a strong suction force to ensure that it is held in the specified position. This means that it can be stopped, and it has excellent effects such as excellent performance when used in actuators and the like.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view showing the entire rotary solenoid according to this invention, Fig. 2 is a schematic explanatory view showing the relationship between the rotor and stator pin, and Fig. 3 is a cross-sectional view taken along A-A of the rotor shown in Fig. 2. A cross-sectional view showing,
FIG. 4 is a schematic vertical cross-sectional view showing a conventional rotary solenoid, FIG. 5 is a schematic cross-sectional view showing a conventional rotary solenoid, and FIG. 6 is a diagram showing a torque curve of the conventional rotary solenoid. 1, 21...Casing, 2, 3...Stator pin, 4, 25...Coil, 5, 6...Bobbin,
7,8,26...Stator, 9,10...Stator plate, 11,33...Rotor, 12,30
... Shaft, 13, 14, 29, 31 ... Bearing, 15, 27 ... Lid member, 22, 28 ...
Bearing portion, 23... Stator member, 24... Protruding portion, 32... Wave washer, 1a, 15a...
...Groove, 1b, 15b, 9a, 10a...hole, 2
b, 3b, 3a, 2a...protrusion, 9b, 10b,
15c...hole, 21a...groove, T...torque, θ
……rotation angle.

Claims (1)

[Scope of utility model registration request] A rotor 11 is rotatably disposed inside the casing 1 by a shaft 12, and the shaft 12
A plurality of stators 7 and 8 are arranged to face the upper and lower surfaces of the rotor 11, respectively, with the shaft 12 as the center in a direction orthogonal to the axial direction of the rotor 11, and with a predetermined gap length between them and the rotor 11. A rotary solenoid is arranged in an annular shape so that the inside of the casing 1 is closed with a cover member 15, and the rotor 11 is formed in a rectangular shape, and the opposing short sides are curved, and The thickness of the rotor 11 is formed to be thicker in the center part in the longitudinal direction, and further, protrusions 2a, 3a are provided on the outer side of the upper surface of the stators 7, 8, facing the outer peripheral surface of the rotor 11 with a predetermined gap length. A rotary solenoid characterized by being provided with.