JPH0459762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reluctance type rotary solenoid device.

The well-known rotary solenoid has a large output torque and does not use a magnet, so it has a feature that the structure is simplified.

However, it has the following drawbacks. It has the disadvantage that it generates a loud mechanical noise during operation, and that the rotational torque is large at the beginning of rotation and becomes significantly small at the end of rotation. Furthermore, the rotation angle of the configuration is small, 20
It becomes difficult to obtain more than a degree. Moreover, even if it is obtained, the output torque is small and practicality is lost.

Furthermore, since the rotor moves up and down, it is difficult to attach a position detection device whose output changes depending on the rotation angle, and therefore it is difficult to control the rotation angle using a servo device.

The device of the present invention eliminates the above-mentioned drawbacks, maintains a large output torque, has flat output torque characteristics, and can freely obtain torque characteristics that adapt to the load situation. It has the feature that when a servo circuit is attached, the stopping position can be made accurate.

In particular, it can be used as a servo valve for an automobile carburetor or as a control drive source for various automatic devices, since it can be small, inexpensive, and operate stably, providing an effective technical means. Moreover, even when a servo device is not used, it is an effective means as an actuator.

The details of an embodiment of the device of the present invention having the above-mentioned features will be described below.

In Fig. 1a, the symbol 1 is a cup-shaped stator made of press-formed mild steel, and the bottom is the bottom of the cup on the paper.
The top is the open end.

1a, 2a and 2b, and 3a each show the same apparatus of the present invention, and the same parts are designated by the same symbols. Therefore, the three will be explained together.

2a is a diagram of the rotor 3 viewed from the direction of arrow G in FIG. 1, and FIG. 2b is a diagram of the stator 1 viewed from the direction of arrow G.

FIG. 3a is a cross-sectional view of the cross section taken along dotted lines A and B in FIGS. 2a and 2b, viewed from the direction of the arrow.

Next, the configuration will be explained with reference to FIGS. 1, 2, and 3.

In FIG. 2b, the central part is a ring 34,
Externally from this are magnetic poles 1 made of fan-shaped pieces of mild steel with a width of 60 degrees and an equal pitch spaced apart from each other by 60 degrees.
A flat plate on which poles a, 1b, and 1c are provided is made by pressing a mild steel plate, and the outer sides of the magnetic poles 1a, 1b, and 1c are fitted into the openings of the magnetic body 1.

The rotor 3 is made by pressing a mild steel plate into the shape shown in FIG. Further, ball grooves 9a, 9b, and 9c are formed on the back surface of each salient pole at axially symmetrical positions. The ball grooves 9a, 9b, 9c can be made by cutting, but they can also be made by pressing.

Mild steel pieces 1a, 1b, 1c that become the magnetic poles in Fig. 2b
Also, ball grooves 12a, 12b,
12c is made, and the rotor 3 is connected to magnetic poles 1a, 1b, 1
c overlap and rotate the rotor 3 in the direction of arrow C,
The steel balls 8a, 8b, and 8c roll in respective ball grooves to form a ball bearing. The rotation angle due to such a ball bearing is 60
It is larger than the degree.

The production of the ball grooves 12a, 12b, and 12c by cutting has the following problems during mass production.

Salient poles 3a, 3b, 3c and magnetic poles 1a, 1b, 1c
It is optimal that the gap length between the two is maintained at about 50 microns.

In order to maintain such a gap length, the flatness of the facing surfaces of the salient pole and the magnetic pole must have an accuracy of 10 microns or less. However, plane cutting is relatively easy. Further, the diameters of the steel balls 8a, 8b, and 8c are commercially available with better accuracy, so there is no problem.

However, ball grooves 9a, 9b, 9c and 12
It is difficult to maintain the cutting depths of a, 12b, and 12c at the above-mentioned accuracy.

Therefore, in this embodiment, the following means are adopted.

The ball grooves 9a, 9b, 9c are made by press working. Since it is a flat mild steel plate, the groove depth can be maintained at a set value.

As shown in Figures 1a and 3a, the magnetic pole 1
On a, 1b, 1c are magnetic poles 1d, 1e, of the same type.
1f is attached, and the magnetic poles 1d, 1e, and 1f are also made of mild steel plates.

Through-holes 12a, 12b, 12c, which serve as ball grooves, are formed in the magnetic poles 1d, 1e, 1f by cutting or punching press work.

Steel balls 8a, 8b, and 8c are interposed within the above-mentioned through holes.

The sum of the thickness of the through holes, that is, the magnetic poles 1d, 1e, 1f, and the depth of the ball grooves 9a, 9b, 9c is about 50 microns smaller than the diameter of the steel balls 8a, 8b, 8c. Therefore, the length of the gap between the salient poles 3a, 3b, and 3c is also about 50 microns, which is characterized in that its accuracy can be easily maintained.

The details described above are shown partially enlarged in FIG. 3d. That is, symbol 3a is a cross section of a portion of the salient pole, and symbol 1a is a cross section of a portion of the magnetic pole. A through hole 12a is provided in the magnetic pole 1d and is attached to the magnetic pole 1a. The void length (indicated by arrow 40) is
This is achieved by making the sum of the depth of the ball groove 9a and the thickness of the magnetic pole 1d shown by the dotted line 50 microns smaller than the diameter of the steel ball 8a.

If the ball groove 9a is removed as shown in the figure and the opposing surface of the salient pole 3a is made flat, the gap length will be only the difference between the thickness of the magnetic pole 1d and the diameter of the steel ball 8a, and the gap length will be further reduced. Can be held more accurately.

An example of the above-mentioned case is the case shown in FIG. 1b, which will be described later.

Even in the case of Figure 1a, as shown in Figure 3a,
If the gap between cylinder 4 and cylinder 13 is made smaller,
Since the rotor 3 will not deviate from the rotation center line,
Ball grooves 9a on opposing surfaces of salient poles 3a, 3b, 3c,
9b and 9c can be removed.

The one shown in FIG. 3e is the third ball groove 9a.
was made by other means. Figure 3d
Items with the same symbol are the same parts.

A salient pole 1g (mild steel plate) of the same type is attached to the salient pole 3a, and a through hole 9a is provided therein. The steel ball 8a has through holes 9a, 12a and a salient pole 3.
It is held between a and 1a. Since it is not necessary to create a ball groove in the salient pole 3a, accuracy is improved. In this case, the sum of the thicknesses of the salient poles 1g and 1d is made 50 microns smaller than the diameter of the steel ball 8a, which has the effect of accurately maintaining the gap length.

In FIG. 2a, although not shown, a back spring in the direction of arrow F is applied to the rotor 3, so steel balls 8a, 8b, 8c
comes into contact with the end of each ball groove, rotation in the direction of arrow F is suppressed, and in this state, the ends of the salient poles 3a, 3b, 3c are in contact with the magnetic poles 1a, 1b,
The end portions 1c, 1d, 1e, and 1f are arranged to slightly overlap and face each other. Salient poles 3a, 3b,
The opposing surfaces of the magnetic poles 3c and the magnetic poles 1d, 1e, and 1f are flat, and the gap between them is about 50 to 100 microns.

As can be seen from the sectional view of FIG. 3, the symbol 4 is a mild steel cylinder whose upper end is press-fitted into a circular groove of the rotor 3.

The cylinder 4 serves as a magnetic path between the rotor 3 and the stator 1.

The spring 5 is inserted through a hole 10 (FIG. 2a) of the rotor 3, and its end portion is inserted into the hole 10a. The other end of the spring 5 has a hole 11
(Fig. 2b), and its end is inserted into the hole 11a
is inserted into.

The spring 5 is stretched and at the same time twisted around its longitudinal direction, and then the above-mentioned hole 1 is formed.
0, 10a and 11, 11a.
Therefore, the steel balls 8a, 8b, 8c fit into the ball grooves 9a, 12a, 9b, 12b, 9c, 12.
The rotor 3 receives a driving torque in the direction of arrow F (FIG. 2a). However, the positions where the steel balls 8a, 8b, 8c abut on the respective ball grooves, that is, the salient poles 3a, 3b, 3c are the magnetic poles 1d, 1
It is stopped at a position slightly opposite to and overlapping with e and 1f. The torque in the direction of arrow F is obtained by the torsional torque of spring 5, which serves as a back spring. The excitation coil 14 is mounted between the cylinder 13 and the outside of the stator 1 after being wrapped and solidified.

Although the cylinder 13 is not necessarily required, it is installed on the stator 1 and forms a magnetic path together with the cylinder 4.

When the excitation coil 14 is energized, the magnetic flux is transmitted to the stator 1, cylinders 13, 4, 3, rotor 3 (including salient poles 3a, 3b, 3c), and magnetic poles 1a, 1b, 1c, 1d, as shown in FIG. 3a. , 1e, 1f, stator 1
Closed via.

At this time, regarding the torque of the rotor 3, the fifth
Salient poles 3a, 3b, 3c and magnetic poles 1d, 1e,
Next, a developed view of 1f will be explained.

In the fifth, the salient poles 3a, 3b, 3c and the magnetic poles 1d, 1e, 1f are shown in FIGS. 2a, b and 3a.
It is displayed on parts with the same symbol.

The width of each salient pole is slightly larger than 60 degrees,
The width of each magnetic pole is approximately 60 degrees, and each magnetic pole and salient pole are arranged at equal pitches.

In the case of the embodiments shown in FIGS. 2a and 2b, the fifth first
The tiers indicate salient poles 3a, 3b, and 3c, and the third tier indicates magnetic poles 1d, 1e, and 1f.

When the excitation coil 14 is energized, the magnetic poles 1d, 1
e, 1f are excited, salient poles 3a, 3b,
3c, different polarities are generated by induction, an attractive force is generated in the direction of arrow C, and the rotor 3 rotates in the direction of arrow C.

The output torque curve due to the salient pole 3c in Fig. 2a is:
The curve becomes like curve 27 in the graph of FIG. 4, with a steep rise and a peak value at the initial stage.

As estimated from the shape of the salient poles 3a and 3b, and confirmed by actual measurement, the salient poles 3a and 3b have a peak value at the rear edge, as shown by the curve 28 in the graph of FIG.
The horizontal axis of the graph in FIG. 4 is the rotation angle, and the vertical axis is the torque.

Since the salient poles 3a and 3b have the same torque curve shape, the curve 28 in FIG. 4 is the composite torque of both, and its peak value is adjusted to be the same as the peak value of the curve 27. .

Therefore, the resultant torque of curves 27 and 28 is curve 30.
As shown in b, there is a characteristic of flat torque characteristics.

The symbol 6 in FIGS. 1a and 3a is a gear, which is fixed to the rotor 3. Therefore, from this gear 6,
The rotational output can be extracted to rotate the load. Further, a load can also be driven by a rotating shaft 6a installed at the rotation center of the gear 6. Also rotor 3
It is also possible to press and move the load by using a planting pin 7 set up in a part of the wall.

What is shown in FIG. 1b and FIG. 3b is another embodiment, and parts with the same symbols as those in the previous embodiment are the same members, so a description thereof will be omitted. The salient poles and magnetic poles used have exactly the same shape as the salient poles and magnetic poles shown in FIGS. 2a and 2b.

The difference from the previous embodiment is that a rotating shaft 15 whose one end is fixed to the rotor 3 is used, and the spring 5 and cylinders 4 and 13 are removed.

The rotating shaft 15 is rotatably supported by a bearing 16 (a ball bearing may be used) fixed to the bottom plate 2, and a central hole of a mild steel disk 17 is press-fitted and fixed to the rotating shaft 15.

The ring 17a is a slippery plastic ring, which is interposed between the disc 17 and the stator 1, and the rotor 3 and the magnetic poles 1d, 1e, 1f are spaced apart, and the steel balls 8a, 8b, 8c are connected to each other. This prevents it from escaping from the groove.

A spiral spring (not shown) is placed between the rotor 3 in FIG.
The fact that the rotor 3 is held in a predetermined position by contacting the ends of the ball grooves b and 8c is exactly the same as in the previous embodiment.

When the excitation coil 14 is energized, the resulting magnetic flux is distributed to the stator 1, disk 17, and rotating shaft 1 in FIG. 3b.
5, rotor 3 (including salient poles 3a, 3b, 3c),
It is closed via the magnetic poles 1a, 1b, 1c, 1d, 1e, 1f and the stator 1.

Therefore, the output torque due to the salient pole 3c is the curve 27 in the graph of FIG. 4, and the salient pole 3a,
3b is also the curve 28, so
The resultant torque is as shown by the curve 30b, and is characterized by a flat torque characteristic.

By using only the portion indicated by the arrow 29 between dotted lines D and E in the graph of FIG. 4 as the output torque, a flat torque output can be obtained. Substantially, the width of the arrow 29 is approximately 45 degrees.

The output torque is approximately proportional to the second power of the current flowing through the exciting coil 14. In addition, the magnitude of the output torque largely depends on the size of the gap between the facing surfaces of the salient pole and the magnetic pole and the size of the gap between the cylinders 4 and 13 in a place where magnetic resistance is large, that is, in FIG. 3a. . Therefore, it is necessary to make the above-mentioned void as small as possible.

In this embodiment, a product made by pressing a mild steel plate has been described, but it can also be made by using sintered mild steel powder.

Although an example has been shown in which a back spring is provided between the rotor 3 and the stator 1, the same effect can be obtained even if a back spring is applied to the load.

The dotted lines 25 and 26 in FIG. 3b are the gear train and the load, respectively. The rotational torque of the rotational output shaft 15a can be transmitted to the load 26 by the gear train for speeding up or deceleration, and the load 26 can be moved or rotated.

Both the salient poles 3a, 3b, 3c and the magnetic poles 1a, 1b, 1c, 1d, 1e, 1f in FIGS. 2a and 2b are
The width may be set to 60 degrees; in this case, the width of the fourth
The length of arrow 29 in the figure, ie the effective rotation angle, decreases. Furthermore, even if the width of each magnetic pole and each salient pole is made smaller than 60 degrees, the rotation angle will similarly become smaller, but the features of the present invention will not be lost. In the case of low output, plastic balls can also be used instead of the steel balls 8a, 8b, 8c.

In addition, in this embodiment, the shape of the salient poles 3a and 3b was changed to a wedge shape to achieve the purpose, but the magnetic poles 1d and 1
The same purpose can be achieved by changing e to a wedge shape. Even if the shapes of the salient poles 3a, 3b, and 3c in FIG. 5 are changed as shown by symbols 3d, 3e, and 3f in the second stage, the torque characteristics become flat, and one of the objects of the present invention is achieved. be done.

The salient poles 3d, 3e, 3f are
The rear edge of the salient pole has a triangular shape that projects upward, forming an inclined surface, and the width 3n of the salient pole in the direction perpendicular to the rotational direction is narrower than that of the magnetic poles 1d, 1e, and 1f.

As the salient pole 3e rotates, the torque is
Torque is generated by the magnetic lines of force slanted as shown by arrows 3k and 3m, and a decrease in torque is prevented, and the slope of the trailing edge further prevents a decrease in torque.
According to actual measurements, the torque characteristic is flat as shown by curve 30b in the graph of FIG.

The situation is the same for the salient poles 3d and 3f, and the resultant torque also becomes like the curve 30b, which has the effect of providing a flat torque curve.

By making the width and slope of the trailing edge slope portions of the salient poles 3d, 3e, and 3f shown in FIG. 5 curved, it is possible to obtain a flatter torque characteristic or a torque characteristic suitable for the load.

The slope part of the salient pole 3d in FIG. 5 is removed as shown by the dotted line 3j, and the other salient poles 3e and 3f are also removed as shown by the dotted line.
Even if the slope portion is removed, a substantially flat torque characteristic can be obtained. In this case, arrow 3n
As shown, the length is the magnetic pole 1d, 1e, 1
Since it is smaller than that of f, arrow 3k,
This is because the inclined magnetic lines of force shown at 3 m prevent the torque from decreasing at the trailing edge.

For example, the shaft of a servo valve of a carburetor that controls the intake of gasoline in an automobile is directly connected to the rotating shaft 15 of the above-described embodiment, and the amount of current supplied to the excitation coil 14 is controlled by a servo circuit, as will be described later. This allows the flow rate of gasoline to be adjusted.

If necessary, the rotation of the rotating shaft 1 may be sped up using a star gear.

When using a servo circuit, it is effective to have a flat torque curve, but when used for the same purpose as a well-known rotary solenoid, a characteristic like curve 27 in Figure 4 may be sufficient. There is. In such a case, the salient poles 3a in FIG. 2a,
Without making 3b into a wedge shape, dotted line K,
It can be used like L, that is, the same shape as the salient pole 3c.

The features of the apparatus of the present invention explained in each of the above embodiments are as follows.

First, there is no loud impact noise during operation.

Second, the output torque can be increased by reducing the gaps between the members forming the magnetic path. Thirdly, the rotation angle can be increased. Fourth, the configuration is simplified. This is particularly simplified in the case of the embodiment of FIG. 1a.

Next, an example of the means for energizing the excitation coil 14 will be explained with reference to FIG. 8a.

In FIG. 8a, symbol 19 is a constant current circuit,
The current flowing through the excitation coil 14 is controlled by the input signal of the terminal 19a. Symbols 18a and 18b are the positive and negative electrodes of the power supply.

When the electric switch 19b is closed, the excitation coil 1
4 is energized. Therefore, the salient poles 3a, 3 in FIG.
b, 3c are attracted by the magnetic poles 1d, 1e, 1f and rotate in the direction of arrow C.

By changing the input signal of the terminal 19a,
The output torque is subject to change.

When the excitation coil 14 is energized, the rotor 3 rotates in response to the back spring and the load, but when the electric switch 19b is opened, the excitation coil 14 is de-energized, so it springs back in the direction of the arrow F mentioned above. . Since a magnet is not used at this time, there is a feature that smooth return operation can be performed without generating a jerking torque.

In the embodiments shown in Figures 1, 2, and 3, there are three salient poles and three magnetic poles.
Although it is one piece at a time, it can be four pieces, five pieces, and so on. In this case, the output torque increases, but
The rotational operating angle decreases.

Next, the case where there are two air poles and two magnetic poles will be explained with reference to FIGS. 6 and 7. Components with the same symbols as those in the previous embodiment are the same members, so their explanation will be omitted.

FIG. 6 is a sectional view taken along dotted lines A and B in FIG. 7 from the direction of the arrow.

In Fig. 6, the center part of the bottom of the cylinder 1, which is a magnetic stator made of mild steel, is pressed into a cylindrical shape 2.
a, 2b, into which oil bearings 15d, 15e are fitted, and a rotary shaft 15 is rotatably supported therein. E-ring 15
c prevents the rotating shaft 15 and the rotor 3 fixed thereto from moving upward and preventing the steel balls 8a and 8b from escaping.

A mild steel cylinder 4 is press-fitted into a circular groove on the back surface of the rotor 3. 7a and 7b are views of the rotor 3 (including salient poles 3a, 3b) and magnetic poles 1a, 1b, 1d, 1e) of FIG. 6, respectively, viewed from above.

The width of salient poles 3a and 3b is larger than 90 degrees, and the width of magnetic pole 1
The widths of a, 1b, 1d, and 1e are 90 degrees.
As in the previous embodiment, ball grooves 9a, 9b, 12a, 12b are formed by sandwiching steel balls 8a, 8b, and these constitute a ball bearing. Torque in the direction of arrow F is applied by a back spring (not shown), but the steel balls 8a, 8b are
b, 12a, 12b, the rotation of the rotor 3 is suppressed, and in this position, the salient poles 3a, 3b slightly overlap and oppose the magnetic poles 1d, 1e, and move in the direction of arrow C. When rotor 3 is rotated,
The number of facing surfaces is increasing.

As shown in FIG. 7b, the magnetic poles 1a and 1b have a circular ring 34 in the center and a fan-shaped soft steel piece 1 on the outer periphery.
a and 1b are provided, and the outer peripheral portions thereof are press-fitted and fixed to the open end of the cylinder 1 serving as the stator.

On the magnetic poles 1a, 1b, fan-shaped mild steel pieces 1d, 1e of the same type are stuck, and through holes 12a, 12b are formed in the magnetic poles 1d, 1e by cutting or punching press processing. Through holes 12a, 12b
A cross section is shown in FIG. The ball grooves 9a and 9b of the rotor 3 are not necessarily necessary. This is because the rotational position of the rotating shaft 15 is designated by the bearings 15d and 15e. Also rotor 3
ball grooves 9a, 9b only, magnetic poles 1d, 1e
The same purpose can be achieved even if the steel balls 8a and 8b are brought into contact with the planar magnetic poles 1a and 1b. This configuration is the least expensive. Such measures can be applied to embodiments with other bearings.

The thickness of magnetic poles 1d and 1e is determined by steel ball 8.
By making the diameter smaller than the diameters of a and 8b by the gap length, there is an effect that the gap length can be maintained accurately.

The excitation coil 14 is installed inside the cylinder 4 and the stator 1 as shown in the figure, and when it is energized, the stator 1, the cylinders 2a and 2b, the cylinder 4, and the rotor 3 (including the salient poles 3a and 3b) and stator 1 (magnetic poles 1a, 1
b, 1d, 1e), the magnetic path is closed.

Therefore, as in the previous embodiment, the salient poles 3a, 3b are attracted by the magnetic poles 1d, 1e and rotated in the direction of arrow C against the back spring. E-ring 15
Instead of c, it is also possible to fix the mild steel number 17 shown in FIG. 3b to the rotating shaft 15 and use the stator 1 and the rotating shaft 15 as a magnetic path. At this time, the cylinder 4 becomes unnecessary. The torque due to the salient pole 3b is the fourth
As mentioned above, if the torque by the salient pole 3a is configured as shown in the curve 27 in the figure, and the torque due to the salient pole 3a is configured as shown in the curve 28, the combined torque of both becomes the curve 30b, and a flat torque characteristic is obtained. However, in this example, The following measures have been adopted to achieve the same objective:

The dotted line 38 in FIG. 7a indicates the magnetic poles 1a, 1b, 1
It shows the outer diameter of d and 1e. Salient pole 3a, 3
The radial length of b is smaller than the outer diameter 38, as shown. Therefore, when the salient poles 3a, 3b rotate in the direction of the arrow C, the arrows 39a, 39
It has the characteristic that oblique lines of magnetic force as shown in b are generated, and the output torque that decreases with rotation can be compensated for and a substantially flat torque characteristic can be achieved.

In this embodiment, the length of the arrow 29 in FIG. 4 is approximately 75 degrees, and is characterized by a flat torque characteristic with a relatively large angle.

Next, the embodiment shown in FIG. 3c will be described.

In FIG. 3c, the same symbols as in the previous embodiment indicate the same members. The stator 1 is not cup-shaped but cylindrical, the bearing 16 shown in FIG.

The rotor 33 has exactly the same configuration as the rotor 3, and includes three salient poles corresponding to the salient poles 3a, 3b, and 3c shown in FIG. 2a. On the bottom of the cylinder 1 are magnetic poles 1a, 1b, 1c and magnetic poles 1d, 1.
The outer part of a mild steel plate having the same shape and having magnetic poles corresponding to e and 1f is press-fitted and fixed.

In FIG. 3c, only the magnetic pole 1a, the members corresponding to the annular ring 34, and the hole 12d corresponding to the through hole 12a are shown. Members corresponding to the magnetic poles 1a and 1d are shown as magnetic poles 2a and 2d.

The salient poles 3a, 3b, . . . and the salient poles of the rotor 33 are fixed to the rotating shaft 15 so as to have the same phase. Further, each magnetic pole is also fixed to the stator 1 so as to have the same phase.

Ball bearing devices with through holes 12d, etc.
It is the same as that in Fig. 3b.

Since the bearing of the rotating shaft 15 has been removed, the rotors 3 and 33 are marked with symbols 9a, 9b, and 9b in FIG. 2a.
A ball groove shown at 9c is required. The same objective can also be achieved with the ball bearing device described above with reference to FIG. 3e. When the excitation coil 14 is energized, the rotors 3 and 33 and the rotating shaft 15 rotate as one, and when the excitation coil 14 is energized, the rotors 3 and 33 generate driving torque and rotate. The rotors 3 and 33 have the same torque characteristics, and the output torque is obtained from the rotating shaft 15, which is 2 in the case of Fig. 3b.
It has the feature of twice the torque.

A portion whose cross section is indicated by symbol 34 indicates an annular portion for connecting the bases of the three salient poles of the bottom plate 2 to each other.

What is shown in Fig. 3f is a rotating shaft 15, an output shaft 1
This is an embodiment in which the actuator 5a can be driven left and right.

In FIG. 3f, the same symbols as in FIG. 3c are the same members. The differences are as follows.

A stator 1 (cylindrical) is attached to the outer periphery of the magnetic disk 2.
is press-fitted from above, and the stator 35 (cylindrical magnetic body) is press-fitted from below.

At the lower end of the stator 35, magnetic poles 2a, 2d (third
The same member as in Figure c) is press-fitted and fixed.

The rotating shaft 15 penetrates the central hole of the disc 2 with a gap therebetween. The rotor 37 indicated by the dotted line is the third
Although it has the same configuration as the rotor 33 in FIG.

When the excitation coil 14 is energized, the rotating shaft 15 rotates in a predetermined direction as in FIG. 3c. However, when the excitation coil 14a is energized, the rotating shaft 15 returns in the opposite direction and receives rotational torque.

As described above, there is an effect that forward and reverse output torques can be generated on the rotating shaft 15.

If the device of the present invention is to control, for example, a servo valve of a carburetor, a servo circuit is required. For this reason, a position detection device whose output increases or decreases in proportion to the rotation angle of the rotor 3 is required. Next, I will explain it.

In FIG. 1b and FIG. 2a, a plastic magnet 29a is attached to the outer periphery of the salient pole 3a and is magnetized in the radial direction. ) is fixed.

The magnet 29a is magnetized in the radial direction parallel to the plane of the paper, and the strength of magnetization is adjusted so that the Hall output gradually increases or decreases when the magnet 29a rotates together with the salient pole 3a.

Therefore, the Hall output becomes a position detection output. It is preferable to adjust the strength of magnetization so that the Hall output is as linear as possible. Support body 30
a is for supporting the Hall element 30.

FIG. 8b shows that the first
This is a circuit that controls the rotation angle of the rotor 3 shown in the figure. When controlling the opening and closing of a load such as the aforementioned servo valve using the rotating shaft 15 in FIG.
It is. Symbol 22 is a circuit that outputs the position detection signal described above. The position detection signal becomes larger as the valve opens. Furthermore, the valve is configured to open more as the current flowing through the excitation coil 14 increases.

When the set value is input to the operational amplifier 24 from the circuit 23, if the valve opening is too small at this time, the output of the circuit 22 is small, so the base current of the transistor 20 is large, and the valve opening increases. When the two inputs of the operational amplifier 24 become approximately equal, the rotating torque and the torque of the back spring are balanced and the valve stops, and the valve opens in accordance with the output of the circuit 23.

Any other known means may be used as the position detection means. For example, a metal film resistor is fixed to the circumferential surface of the rotor 3, and a position detection signal can be obtained from a brush that is in sliding contact with the resistor.

It is clear that servo devices of the same means can be added to other embodiments as well.

As explained in each of the following embodiments, the apparatus of the present invention achieves the object stated at the beginning and is highly effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the external appearance of the device of the present invention, FIG. 2 is an explanatory diagram of salient poles and magnetic poles, FIG. 3 is a sectional view of the device of the present invention, and FIG. 4 is a graph of the output torque curve.
FIG. 5 is a developed view of salient poles and magnetic poles, FIG. 6 is a sectional view of another embodiment, FIG. 7 is an explanatory diagram of the salient poles and magnetic poles, and FIG. The applicable energization control and servo circuit diagrams are shown respectively. 1, 35...Stator, 1a, 1b, 1c, 1
d, 1e, 1f...magnetic pole, 2...magnetic disc,
3, 33, 37...rotor, 3a, 3b, 3c,
..., 3f... salient pole, 5... spring, 4,1
3, 2a, 2b...magnetic cylinder, 8a, 8b, 8
c...Steel ball, 9a, 9b, 9c, 12
a, 12b, 12c... Ball groove, 6... Gear,
6a, 15, 15a... Rotating shaft, 7... Planting pin, 30... Hall element, 30a... Support, 2
9a...Magnet, 10, 10a, 11, 11
a... Hole, 14, 14a... Excitation coil, 17
...mild steel disc, 16, 15d, 15e...bearing,
25... Gear train, 26... Load, 27, 28, 3
0b... Torque curve, 32... Contact pin, 18
a, 18b...Power supply positive and negative poles, 19... Constant current circuit, 24... Operational amplifier, 23... Electric signal generator for commanding the size of valve opening, 22... Position detection device, 20... Transistor, 34...Magnetic ring, 2a, 2d...Magnetic poles, 40...Gap length.

Claims (1)

[Scope of Claims] 1. A stator made of a cylindrical magnetic material, and a width at a predetermined angle that protrudes from the outer periphery to the center on the top or bottom surface of the stator, or both thereof. n pieces of magnetic flat plates (n is a positive integer)
, and n salient poles whose central part is a magnetic disk and which protrude radially from the outer periphery and whose width is equal to or larger than the width of the aforementioned magnetic poles. ball grooves provided in the magnetic poles and the salient poles, and a ball groove between the magnetic poles and the salient poles so that the rotor including the salient poles is rotatably supported by the pair of the magnetic poles and the salient poles facing each other with a slight gap in between. a ball bearing consisting of balls interposed in the rotor; a magnetic body disposed along the central axis of rotation of the rotor so as to form a magnetic path between the salient poles and the stator; Between the inside of the cup-shaped magnetic body, an excitation coil wound around the magnetic body, a mechanism for preventing separation of the salient pole and the magnetic pole, and a mechanism that overlaps the salient pole and the magnetic pole by a small width. When the salient poles of the rotor and the rotating shaft are rotated by the mechanism that suppresses and holds the rotor from rotating at opposite positions, and the excitation coil is energized, the salient poles and the rotating shaft are rotated in the direction perpendicular to the rotating direction. Consisting of a mechanism in which the width of the surface facing the magnetic poles is larger at the end of rotation than at the beginning, or a mechanism that generates torque with equivalent characteristics, and a drive mechanism for the load provided on the rotor. A rotary solenoid device featuring: 2. From a stator made of a cylindrical magnetic material, and a magnetic flat plate with a width of a predetermined angle protruding from the outer periphery to the center on the top or bottom surface of the stator, or both sides thereof. n pieces (n is a positive integer)
, and n salient poles whose central part is a magnetic disk and which protrude radially from the outer periphery and whose width is equal to or larger than the width of the aforementioned magnetic poles. A rotary shaft and a fixed shaft installed on the rotor such that the rotor including the salient poles is rotatably supported by the pair of magnetic poles and salient poles facing each other with a slight gap between them. A ball bearing consisting of a bearing provided on the child, a ball groove provided on one of the facing surfaces of the magnetic pole or the salient pole, and a ball interposed between the two, and the aforementioned salient pole and the stator. A magnetic body that forms a magnetic path provided between the rotor and the stator, including the rotation axis of the rotor, and the inside of the cylindrical magnetic body, so as to form a magnetic path. An excitation coil wrapped around a magnetic body, a mechanism that prevents the salient pole from separating from the magnetic pole,
At the position where the salient poles and the magnetic poles overlap by a small width and face each other, the salient poles of the rotor and the rotating shaft are rotated by a mechanism that suppresses and holds the rotor from rotating, and by energizing the excitation coil. Sometimes, the rotor is equipped with a mechanism in which the width of the facing surface between the salient poles and the magnetic poles perpendicular to the rotation direction is larger at the end of rotation than at the beginning, or a mechanism that generates torque with equivalent characteristics. A rotary solenoid device comprising a drive mechanism for a load.