JPH0458682B2 - - 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, due to its configuration, the rotation angle is small, 20
It becomes difficult to obtain more than a degree.

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 by pressing a mild steel material.
The bottom is the open end.

FIG. 1a, FIGS. 2a and b, and FIG. 3a each show the same device of the present invention, and the same parts are designated by the same symbols.

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 taken along dotted lines A and B in FIGS. 2a and 2b, as seen from the direction of the arrow.

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

The width of the mild steel pieces 1a, 1b, and 1c (Fig. 2b) bent toward the center from the outside of the stator 1 is 60 degrees,
They are spaced 60 degrees apart and have an equal pitch.

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.

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
When the rotor 3 is rotated in the direction of arrow C, the steel balls 8a, 8b, and 8c roll in the respective ball grooves to form a ball bearing. The rotation angle due to such a ball bearing is
The angle is greater than 60 degrees.

Although not shown, a back spring in the direction of the arrow F is applied to the rotor 3, and when the steel balls 8a, 8b, 8c come into contact with the ends of the respective ball grooves, the rotor 3 rotates in the direction of the arrow F. is suppressed, and in this state, the ends of the salient poles 3a, 3b, 3c are opposed to each other, slightly overlapping with the ends of the magnetic poles 1a, 1b, 1c. Salient pole 3a,
The opposing surfaces of the magnetic poles 3b, 3c and the magnetic poles 1a, 1b, 1c are flat, and the gap 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 bottom plate 2.

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 located at the magnetic poles 1a, 1
It is stopped at a position slightly opposite to and overlapping with b and 1c. 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. It is also possible to use only the tension of the back spring 5 to press the salient poles and the magnetic poles through the aforementioned ball grooves and steel balls, and apply the back spring to other parts, such as the rotor or the load. The back spring in this case serves as a return device for the rotor 3. Other known means may be used as such a return device.

Although the cylinder 13 is not necessarily necessary,
It is installed on the bottom plate 2 and forms a magnetic path together with the cylinder 4.

When the excitation coil 14 is energized, its magnetic flux flows through the stator 1, the bottom plate 2, the cylinder 13,
4. Closed via rotor 3 (including salient poles 3a, 3b, 3c), magnetic poles 1a, 1b, 1c, and stator 1.

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

In FIG. 5, salient poles 3a, 3b, 3c and magnetic poles 1a, 1b, 1c represent members with the same symbols as in FIGS. 2a and 2b.

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 embodiment shown in FIGS. 2a and 2b, the first row in FIG. 5 shows the salient poles 3a, 3b, and 3c, and the third row shows the magnetic poles 1a, 1b, and 1c.

When the excitation coil 14 is energized, the magnetic poles 1a, 1
b, 1c are excited, so the salient poles 3a, 3b, 3
In c, 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 recognized 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.
In the graph of FIG. 4, the horizontal axis is the rotation angle, and the vertical axis is the torque.

Since the salient poles 3a and 3b have the same torque curve and 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 polar line 30
It has a characteristic of flat torque characteristics as shown in b.

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 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 into the rotating shaft 15.

The ring 17a is a slippery plastic ring interposed between the disc 17 and the bottom plate 2,
The rotor 3 and the magnetic poles 1a, 1b, 1c are spaced apart to prevent the steel balls 8a, 8b, 8c from escaping from the ball grooves.

A spiral spring (not shown) is also applied 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 bottom plate 2, the disc 17, the rotating shaft 15, and the rotating shaft 15 in FIG.
It is closed via the rotor 3 (including salient poles 3a, 3b, 3c), magnetic poles 1a, 1b, 1c, and 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. Further, 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 the 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 was explained, 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 the load is applied to the back spring.

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

Both the salient poles 3a, 3b, 3c and the magnetic poles 1a, 1b, 1c in FIGS. 2a and 2b may have a width of 60 degrees. In this case, the width of the arrow 29 in FIG. 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.

Further, in this embodiment, the object was achieved by changing the shape of the salient poles 3a and 3b to a wedge shape, but the magnetic poles 1a and 1
The same objective is achieved by changing b 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 projecting upward to form a sloped 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 1a, 1b, and 1c.

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 30 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 30, 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 that is 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 1a, 1b, 1
Since it is smaller than that of c, arrow 3k, 3
This is because the inclined magnetic lines of force indicated by 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 device of the present invention in such cases 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. The 18a and 18b are 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 1a, 1b, 1c and rotate in the direction of arrow C.

By changing the input signal of 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, cases in which there are two air poles and one magnetic pole 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 cross-sectional view of the cross section taken along dotted lines A and B in FIG. 7, viewed from the direction of the arrow.

In FIG. 6, a magnetic bottom plate 2 made of mild steel has a central portion protruded into a cylindrical shape 2a, 2b by press working, and oil-less bearings 15a, 1 are placed inside.
5b is fitted, and the rotating shaft 15 is rotatably supported by these. The E ring 15c is connected to the rotating shaft 1
5 and the rotor 3 fixed thereto move upward to prevent the steel balls 8a, 8b from escaping. The bottom plate 2 is press-fitted into the lower inner side of the stator 1.

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 the salient poles 3a, . . . 3b) and the magnetic poles 1a, 1b shown in 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 and 1b are 90 degrees. The steel balls 8a, 8b are held between the ball grooves 9a, 9b,
12a and 12b are made, and these constitute a ball bearing, which is the same as in the previous embodiment. A back spring (not shown) causes the arrow F to
The steel balls 8a, 8b are in the ball grooves 9a, 9b, 12.
The rotation of the rotor 3 is suppressed by contacting the ends of the salient poles 3a, 12b, and in this position, the salient poles 3a, 3
The magnetic poles 1a and 1b slightly overlap and face each other, and when the rotor 3 is rotated in the direction of arrow C, the opposing surfaces increase.

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 excitation coil 14 is connected to the bottom plate 2, the cylinders 2a and 2b, the cylinder 4, and the rotor 3 (salient pole 3).
a, 3b) and stator 1 (magnetic poles 1a, 1b)
), the magnetic path is closed.

Therefore, as in the previous embodiment, the salient poles 3a, 3b are attracted to the magnetic poles 1a, 1b and rotated in the direction of arrow C against the back spring. E-ring 17
Instead of c, a mild steel disc 17 shown in FIG. 3b may be fixed to the rotating shaft 15, and the bottom plate 2 and the rotating shaft 15 may be used as a magnetic path. At this time, the cylinder 4 becomes unnecessary. The torque due to the salient pole 3b is the fourth
The torque due to the salient pole 3a is like the curve 27 in the figure, and the torque due to the salient pole 3a is like the curve 28, and the combined torque of both becomes the curve 30b, so that a flat torque characteristic is obtained.

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

The change in torque characteristics due to the change in the shape of the salient poles 3a, 3b is exactly the same as in the previous embodiment.

In the embodiment shown in FIGS. 7c and 7d, in the configuration shown in FIG. 6, there is one salient pole 3a and one magnetic pole 1a, and the width of the former is larger than 120 degrees, and the width of the latter is larger than 120 degrees.
This is an example in the case of 120 degrees. Since the same members as in the previous embodiment have the same symbols, their explanations will be omitted. salient pole 3
Ball groove 9a on the back side of a and ball groove 1 on the magnetic pole 1a
A steel ball 8a is interposed between 2a to form a ball bearing, and when the salient pole 3a and the counter pole 1a rotate oppositely through a slight gap, the oilless bearing 15
This has the effect of preventing excessive force from being applied to a and 15b and also preventing deformation of the salient pole 1a.

However, if two ball bearings that can be preloaded are used instead of the oilless bearing, the above-mentioned considerations become unnecessary, and the E-ring 15c, ball grooves 9a and 12a, and steel ball 8a become unnecessary. The rotating shaft 15 is press-fitted and fixed to the inner ring of the above-mentioned ball bearing.

It is clear that the above-described modification means can also be applied to the salient poles and magnetic poles shown in FIGS. 7a and 7b. Also in this case, the steel balls 8a, 8b,
Ball grooves 9a, 9b, 12a, 12b are to be removed. Ball bearings 8a, 8b, 9
a, . For example, rotation of the rotor 3 can be inhibited by installing an abutment pin 32 in a part of the rotor 3 and abutting the abutment pin 32 with the magnetic pole 1a. The same objective can be achieved by providing an abutment pin 32 as shown in FIG. 7a.

When the excitation coil 14 is energized, the salient pole 3a is attracted to the magnetic pole 1a and rotates in the direction of arrow C.

Since the shape of the salient pole 3a is the same as that shown as the salient pole 3d in FIG. 5, the output torque curve becomes like the curve 30b in FIG. 4, and a flat torque characteristic is obtained. It has characteristics.

As in the previous embodiment, the sloped portion of the trailing edge is indicated by the dotted line 3j.
The same purpose can be achieved even if the section is deleted.

The rotational operation angle according to this embodiment is the largest, and is in degrees. In all the above embodiments, the magnetic pole 1
a, 1b, 1c are provided with the same configuration on the magnetic bottom plate 2, and facing these, salient poles 3a, 3b, 3c are provided.
Even if the rotor 3 is provided, the same effect can be obtained and the object of the present invention can be achieved. Further, as shown in FIG. 3c, facing the top and bottom surfaces of the stator 1,
The same objective can be achieved even if two sets of rotors 3 and 33 are provided.

In FIG. 3c, the same symbols as in FIG. 3b are the same members, and their functions and effects are also the same. The bearing 16 shown in FIG. 3b is removed, and a rotor 33 made of a magnetic plate is press-fitted and fixed to the lower end of the rotating shaft 15.

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. Ball groove 9f
Although only one portion is shown in the figure, this corresponds to the ball groove 9c. Ball grooves 9a, 9b, 9c
The ball grooves corresponding to the above are designated by symbols 9d, 9e (not shown) and 9f.

The bottom plate 2 made of a magnetic material plate has magnetic poles 1a, 1b, and 1c shown in FIG. 2b, and the ball groove 12d corresponds to the ball groove 12a.
It is shown as. There are two other ball grooves corresponding to ball grooves 12b and 12c, but they are not shown.

Similar to the embodiment shown in FIG. 3b, the ball grooves on the upper surface sandwich three steel balls 8a, 8b, and 8c.

The six ball grooves on the rotor 33 and the bottom plate 2 also sandwich three steel balls, so the rotors 3, 33 and the rotating shaft 15 rotate as one, and when the excitation coil 14 is energized, , rotor 3,3
3 generates driving torque and rotates. The rotors 3 and 33 have the same torque characteristics, and the output torque is obtained from the rotary shaft 15, which is twice the torque as in the case of FIG. 3b.

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.

The same effect can be obtained even if the stator 1 is made into a cylinder, and a ring 34 with three magnetic poles having the exact same configuration as the bottom plate 2 is made by press working on the top surface of the cylinder, and this is press-fitted onto the top surface of the stator 1. You can get something that is effective.

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.

1b and 2a, a plastic magnet 29 is attached to the outer periphery of the salient pole 3a and magnetized in the radial direction, and a Hall element 30 (magnetoresistive element ) is fixed.

The magnet 29 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 29 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 a circuit for controlling the rotation angle of the rotor 3 shown in FIG. 1 based on the position detection signal. 1st
When controlling the opening and closing of a load, such as the above-mentioned servo valve, using the rotating shaft 15 in FIG. 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 corresponding to the output of the circuit 23 opens.

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 the same servo device can be added to other embodiments as well.

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

[Brief explanation of drawings]

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...Stator, 1a, 1b, 1c...Magnetic pole, 2
... Bottom plate, 3, 33 ... Rotor, 3a, 3b, 3
c,...,3f...salient pole, 5...spring, 4,
13, 2a, 2b...Magnetic cylinder, 8a, 8b,
8c...Steel ball, 9a, 9b, 9c, 1
2a, 12b, 12c... Ball groove, 6... Gear, 6a, 15... Rotating shaft, 7... Planting pin, 3
0...Hall element, 30a...Support, 29...
Magnet, 10, 10a, 11, 11a... Hole, 14... Exciting coil, 17... Mild steel disc, 1
6, 15a, 15b... Bearing, 17a... Plastic ring, 25... Gear train, 26... Load,
27, 28, 30b... Torque curve, 32... Contact pin, 18a, 18b... Power supply positive and negative poles, 19...
... Constant current circuit, 24 ... Operational amplifier, 23 ... Electric signal generator for commanding the size of the valve opening, 2
2...Position detection device, 20...Transistor.

Claims (1)

[Scope of Claims] 1. A stator made of a cup-shaped magnetic material, a disc-shaped magnetic bottom plate fitted into the open end of the bottom surface of the stator, and a top or bottom surface of the stator or its On both sides, n magnetic poles (n is a positive integer) made of magnetic flat plates arranged with a width of a predetermined angle projecting from the outer periphery to the center, and a magnetic disk in the center,
A rotor having n salient poles that protrude radially from its outer circumference and whose width is equal to or larger than the width of the magnetic poles described above, and one set of the magnetic poles and salient poles described above. A ball bearing consisting of a ball groove provided in the magnetic poles and the salient poles and a steel ball interposed therebetween so as to face each other with a slight gap in between and rotatably support a rotor including the salient poles; A magnetic body is arranged along the rotation center axis of the rotor so as to form a magnetic path between the salient poles and the stator, and a magnetic body is formed between the magnetic body and the inside of the cup-shaped magnetic body. An excitation coil wound around a magnetic body, a mechanism to prevent separation of the salient poles and the magnetic poles, and a mechanism installed on the rotor or load at a position where the salient poles and the magnetic poles overlap by a small width and face each other. The rotor is prevented from rotating due to the restoring force of the restoring device, and when the rotor is rotated against the restoring force, the opposing area of the salient poles and the magnetic poles is increased. When the salient pole is rotated against the above-mentioned restoring force by the mechanism and energization of the excitation coil, the width of the facing surface between the magnetic pole and the salient pole in the direction perpendicular to the rotation direction becomes smaller than that at the beginning of rotation. 1. A rotary solenoid device comprising a mechanism with a large final stage or a mechanism that generates torque with characteristics equivalent to this, and a drive mechanism for a load provided on a rotor. 2. A stator made of a cup-shaped magnetic material, a disk-shaped magnetic bottom plate fitted into the open end of the bottom of the stator, and the outer periphery of the stator on the top or bottom surface or both sides thereof. n magnetic poles (n is a positive integer) made of magnetic flat plates arranged with a width of a predetermined angle protruding from the center, and a magnetic disk in the center,
A rotor having n salient poles that protrude radially from its outer circumference and whose width is equal to or larger than the width of the magnetic poles described above, and one set of the magnetic poles and salient poles described above. A rotating shaft and a bearing provided on the stator are installed on the rotor, and the above-mentioned salient poles are arranged so as to face each other with a slight gap in between and rotatably support the rotor including the salient poles. A magnetic body that forms a magnetic path between the rotor and the stator, including the rotation axis of the rotor, and a connection between the magnetic body and the inside of the cup-shaped magnetic body, so as to form a magnetic path between the stators. In between, there is an excitation coil wound around the magnetic body, a mechanism for preventing separation between the salient poles and the magnetic poles, and a rotor at a position where the salient poles and the magnetic poles overlap by a small width and face each other. Alternatively, the rotation of the rotor is suppressed due to the restoring force of a restoring device provided on the load, and the rotor is designed so that when the rotor is rotated against the restoring force, the facing area of the salient poles and the magnetic poles becomes large. When the salient pole is rotated against the above-mentioned restoring force by the suppression mechanism that restrains the rotation of the magnetic pole and the energization of the excitation coil, A rotary solenoid device comprising a mechanism in which the final stage of rotation is larger than the initial stage of rotation, or a mechanism that generates torque with characteristics equivalent to this, and a drive mechanism for a load provided on a rotor. .