JPH0737461A - Solenoid actuator - Google Patents

Abstract

PURPOSE:To provide a solenoid actuator having a simple latch structure, which does not consume power during a latch period, and hardly fails. CONSTITUTION:One cross-section of the boundary on which a symmetric axis is sandwiched between a stator 1 and a plunger 2, forms a theta-shape magnetic circuit. Magnetization coils 31, 32 are provided on each two spaces in each space of the theta shape, and a permanent magnet 15 magnetized in the radial direction is provided on a radial direction projected part 14 which corresponds to the center line. Since the length of a first space 41 is shorter than that of a second space, larger amount of flux formed by the permanent magnet 15 flows in the magnetic circuit containing the first gap 41. An electromagnetic attraction force is generated in the left direction, and the plunger 2 can thus be fixed to a left latch position. When the latch is released, current flows in the excitation coils 31, 32, to decrease the flux in the first space 41 and to increase the flux in the second space 42, and the drive force for moving the plunger 2 in the right direction is thus generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid in which a movable element reciprocates by an electromagnetic force and is so-called latched at positions at both ends of a moving range, such as a structure for driving a movable portion of an electromagnetic switch. Regarding actuators.

[0002]

2. Description of the Related Art Solenoid actuators are those in which an electric current is passed through a solenoid-shaped exciting coil to excite a magnetic circuit to generate magnetic flux, and the mover is linearly moved by the generated electromagnetic force. It is usually required to fix the so-called latch.

[0003]

As a method of latching the mover, there are a method of continuously supplying a current to the exciting coil and fixing it by an electromagnetic force, and a method of providing a mechanical latch mechanism. However, in the case of the former method using electromagnetic force, there is a problem that the power consumption is not negligible if the latch period is long, and the battery is quickly consumed especially when driven by a battery. Further, since the mechanical latch mechanism requires a complicated mechanical structure, the solenoid actuator becomes large and heavy, and there is a problem that it is likely to cause a failure.

An object of the present invention is to solve such problems and to provide a solenoid actuator having a simple structure, which does not consume power during a latch period and has a latch structure which is hard to fail.

[0005]

In order to solve the above problems, according to the present invention, a stator made of an axially symmetric ferromagnetic material and an axially symmetric mover movably penetrating the axial center of the stator are provided. And a solenoid-shaped exciting coil that surrounds the mover, a current is passed through the exciting coil to excite a magnetic circuit formed by the stator and the mover, and the mover is axially moved by an electromagnetic force. In the solenoid actuator driven by, the stator has a can-shaped frame composed of lid portions at both ends and a cylindrical portion connecting these, and a ring-shaped radial protruding portion protruding toward the inner diameter side of the axial center portion of the cylindrical portion. And two cylindrical axial projections that project axially inward from the center of both lids, and the mover movably penetrates the centers of both lids of the frame and the axial projections. Made of magnetic material A shaft and a cylindrical mover iron core fixedly attached to the axial center of the shaft, the exciting coil was provided in the space between one lid of the frame and the radial protrusion. It comprises a first exciting coil and a second exciting coil provided in the space between the radial protrusion and the other lid, and the innermost surface of the radial protrusion forms a gap in the outer diameter surface of the mover core. A gap length between a first gap which is a gap between one axial projection and the mover core, and a second gap which is a gap between the other axial projection and the mover core, facing each other. Is set to a predetermined value that is equal to or larger than the movable distance of the mover, and a part of the radial protrusion is made of a permanent magnet magnetized in the radial direction. Alternatively, the permanent magnet of this solenoid actuator is provided as a part of the radial projection, and is provided in the axial center of the mover core and is magnetized in the axial direction. These permanent magnets may be ring-shaped or may be divided in the circumferential direction. Alternatively, in the aforementioned solenoid actuator, a braking pipe made of a non-magnetic material is provided on the outer diameter surface of the mover iron core across the two axial protruding portions and in close contact with the outer diameter side thereof, with a predetermined gap therebetween. It is supposed to be done. Further, the minimum value of the void lengths of the first and second voids is a predetermined value other than zero.

[0006]

In the structure of the present invention, the stator has a can-shaped frame composed of the lid portions at both ends and the cylindrical portion connecting them, and the ring-shaped radial protrusion protruding toward the inner diameter side of the axial center portion of the cylindrical portion. And two lids, both axially projecting inward from the center of the lid, the mover is pierced through the center and axial projections of both lids of the frame. The rod-shaped shaft made of a non-magnetic material and the cylindrical mover iron core fixedly attached to the axial center of the shaft make it possible to reduce the distance between one axial protrusion and the mover iron core. A magnetic circuit including a first gap which is a gap and a radial protrusion, and a magnetic circuit including a second gap which is a gap between the other axial protrusion and the movable core and a radial protrusion. Two magnetic circuits are formed.

A first exciting coil is provided in a space between one lid portion of the frame and the radial projection portion, and an exciting coil is provided in a space between the radial projection portion and the other lid portion of the frame. By constructing with 2 exciting coils, 2
A first and a second exciting coil are arranged in each of the two magnetic circuits so that each magnetic circuit can be excited. The sum of the gap lengths of the first gap and the second gap is set to a predetermined value that is equal to or greater than the movable distance of the mover, and a part of the radial protrusion is formed by a permanent magnet magnetized in the radial direction. As a result, the magnetic flux generated by the permanent magnet is divided into two magnetic circuits, but when the mover moves to one side and enters a latch state, the magnetic resistance of the two magnetic circuits is biased due to the difference in the air gap length. More magnetic flux flows through the magnetic circuit with the smaller air gap length. As a result, a large electromagnetic force acts on this gap to generate a latching force required to fix the mover at the latched position. When releasing the latch, current is applied to the two exciting coils in the same direction for excitation, and the magnetic flux generated by the magnetomotive force is reduced to reduce the magnetic flux in the gap on the latched side. Magnetic flux increases, the electromagnetic attraction force for latching the mover decreases, and when excited above a certain magnetomotive force, the mover moves in the direction opposite to the latched position until now. The moving driving force acts, the latch is released, and the mover moves to the opposite latch position. If the excitation is turned off when stopped at this position, only the magnetic flux generated by the permanent magnet remains, and the latch force can act at this position to maintain the latch as in the initial latch position.

If a permanent magnet magnetized in the axial direction is provided at the axial center of the mover core instead of providing the permanent magnet as a part of the radial projection, the magnetic flux generated by the permanent magnet also causes the permanent magnets on both sides. At the latch position, the electromagnetic attraction force necessary to maintain the latch without the exciting current is obtained, and the exciting coil is excited in the same manner as above to release the latch and the driving force to move the mover in the opposite direction. can get.

The permanent magnet may have a ring shape for generating a magnetic flux in the entire circumferential direction, or may be divided in the circumferential direction to limit the generation of the magnetic flux to a part of the circumferential direction. Will be selected accordingly. In addition, by providing a cylindrical non-magnetic braking pipe straddling the two axial protrusions and closely contacting to the outer diameter side thereof, and by providing a predetermined gap with the outer diameter surface of the mover core. , The movement of the air due to the change of the gap length of the first and second gaps when the mover moves is performed through this gap, but by setting the gap small to limit the movement of the air And a second gap causes a pressure difference, which acts as a braking force that prevents the mover from moving.

When the minimum value of the gap lengths of the first gap and the second gap is set to a predetermined value other than zero, the electromagnetic attraction force in the latched state is limited, and as a result, the latch is released and driven in the opposite direction. The range of magnetomotive force for obtaining the driving force is widened.

[0011]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view of a solenoid actuator showing an embodiment of the present invention. In this figure, the solenoid actuator comprises a stator 1 made of a ferromagnetic material, a mover 2 and a solenoid-shaped exciting coil 3, all of which have a coaxial symmetrical structure.

The stator 1 is a can-shaped frame 11 that also serves as a yoke, and axially protruding portions 12 and 13 provided on the inner side of the left and right lid portions of the frame 11 in the figure to be prominently protruding inward in the axial direction. The frame 11 is composed of a radial projection 14 provided on the axial center of the frame 11 so as to project to the inner diameter side, and a permanent magnet 15 fixed to the inner diameter side end and magnetized in the radial direction.

The mover 2 is composed of a rod-shaped shaft 21 made of a non-magnetic material that penetrates through the centers of the lids at both ends of the frame 11, and a cylindrical iron core 22 coaxially fixed to the axial center thereof. Both the stator 1 and the mover 2 are axially symmetrical. That is, they have a bilaterally symmetrical structure with respect to the center line in the left-right direction in the drawing. However, since the mover 2 moves in the left-right direction, the respective center lines do not match. A-A described later
The cross section is the plane of symmetry of the stator 1, and the mover 2 is in the state of being moved to the leftmost side in the figure, so that the plane of symmetry is on the left side of the AA cross section. The exciting coil 3 has two solenoid-shaped coils 31 and 32 provided in a space between the stator 1 and the mover 2. As is clear from the figure, the exciting coil 3 is also symmetrical with respect to the AA cross section. In general, the exciting coil 3 does not move, and therefore it is usually formed as a part of the stator, but here it will be distinguished.

A first gap is provided between the axial protrusion 12 and the iron core 21.
41, and a second gap 42 is formed between the axial protrusion 13 and the iron core 21. In the figure void 4
1 is small and the gap 42 is large because the mover 2 is moved to the left and is in a stopped position. That is, this figure shows a so-called latched state in which the mover 2 is fixed at the left position. Still, the reason why the gap length of the gap 41 is not zero is that the mover 2 is stopped at this position by a mechanism (not shown), and the latch 41 keeps the gap 41 at a predetermined gap length even in the latched state. The position is set.

The magnetic flux generated by the permanent magnet 15 enters the radial protrusion 14 and is divided into right and left magnetic fluxes 51 and 52, as shown by the chain line having an arrow, which passes through the frame 11 and the axial protrusion 12, After passing through 13, the movable iron core 21 is entered and the permanent magnet 15 is returned. That is, two magnetic circuits that are divided into left and right are formed. Since the air gap 41 is narrower than the air gap 42, the magnetic resistance of the left magnetic circuit is smaller than that of the right magnetic circuit. Therefore, the magnetic flux 52 flowing in the right magnetic circuit shown by one magnetic flux line is changed. In comparison, the magnetic flux 51 flowing in the left magnetic circuit indicated by the two magnetic flux lines is larger. Therefore, the electromagnetic force generated in the air gap 41 is larger than the electromagnetic force generated in the air gap 42. As a result, the movable portion 2 is fixed at that position because the latching force as the leftward force is applied. Latch is maintained. The mover 2 will be fixed in this position unless a force exceeding the latch force acts. Since no current flows through the exciting coil 3, no power is consumed during the latch period.

FIG. 2 is a sectional view taken along line AA of FIG. In this figure, the permanent magnet 15 has a ring shape and is magnetized in the radial direction as described above. Therefore, since the magnetic flux is generated over the entire circumference, such a configuration is adopted when the magnetic flux generated by the permanent magnet 15 is desired to have a large value. FIG. 3 shows an embodiment different from that shown in FIG.
FIG. The difference between this figure and FIG. 2 is the permanent magnet 15A.
Is composed of four blocks arranged in the circumferential direction. The circumferential space in which the permanent magnet 15A exists is shown in FIG.
2 has a merit that the magnetic flux generated is smaller than that of FIG. 2, but the amount of expensive permanent magnets used is smaller than that of FIG. Therefore, FIG. 2 and FIG. 3 are used properly when the required magnetic flux is small and FIG. 2 is suitable when more magnetic flux is required. In FIG. 3, the cross-sectional shape of the permanent magnet 15A is an arc shape on both the inner diameter side and the outer diameter side, and the widthwise surfaces are parallel straight lines, but the shape is not limited to such a shape, and a fan shape is also possible. Of course, it is also possible to adopt a configuration in which the iron core 22 and the radial protrusions 14 are processed into a rectangular cross section in accordance with this shape.

FIG. 4 is a magnetic flux distribution diagram showing the result of computer simulation of the magnetic flux distribution in the solenoid actuator when the mover 2 is in the state of the latch fixed to the position of FIG. The cross-sectional structure is the same as in FIG. 1, the lower horizontal line is the symmetric axis position, the coordinates in the magnetic field calculation are the coaxial cylindrical coordinates, and the left and right directions in the figure are the axial directions.
The upward direction is the radial direction. The main specifications of the solenoid actuator used for the calculation are that the outer diameter of the frame 11 is 114 mm, the length of the frame 11 is 204 mm, the permanent magnet 15 is an Nd-based plastic magnet, and the gap length of the gap 41 is 3 mm. The curves in the magnetic path represent the magnetic flux lines. The permanent magnet 15 is assumed to exist over the entire circumference as shown in FIG. As is apparent from the figure, the magnetic flux generated by the permanent magnet 15 is divided into the magnetic circuits on both sides and flows, but the gap 41
It can be seen that more magnetic flux flows in the left magnetic circuit because the gap length is shorter.

In order to move the mover 2 to the right by unlatching, a current is passed through the exciting coil 3 to apply an electromagnetic force to the mover 2 as a driving force to the right. Fig. 5 shows exciting coil 3
FIG. 2 is an explanatory diagram showing a flow of magnetic flux generated by a magnetomotive force generated by passing an electric current through the parts. Since the same as FIG. 1 except for the flow of the magnetic flux, reference numerals of members and parallel diagonal lines are shown in order to clarify magnetic flux lines. Omitted. In this figure,
When an exciting current is passed through the exciting coil 3 in the illustrated direction, a magnetic flux 53 is generated in the left magnetic circuit and a magnetic flux 54 is generated in the right magnetic circuit. The magnetic flux 53 of the left magnetic circuit is in the opposite direction to the magnetic flux 51 of FIG. 1, and the magnetic flux 54 of the right magnetic circuit is in the same direction as the magnetic flux 52. Therefore, when the exciting current flows through the exciting coil 3, the magnetic flux in the air gap 41 decreases and the magnetic flux in the air gap 42 increases.

FIG. 6 is a magnetic flux distribution diagram in which the magnetic flux distribution in the solenoid actuator is obtained by changing the exciting current by the same method as in FIG. 4, and FIG. 6A shows a magnetomotive force of 1.0 kAT due to the current of the exciting coil 3. , FIG. 6 (b) is 2.0 kAT, FIG.
6 (c) is for 4.0 kAT, and FIG. 6 (d) is for 8.0 kAT. Since the case where the magnetomotive force is 0 is shown in FIG. 4 described above, the change in the magnetic flux distribution when the magnetomotive force is increased can be seen by starting from FIG. 4 and looking from top to bottom in FIG. In contrast to FIG. 4, it can be seen that in FIG. 6A, the magnetic flux of the right magnetic circuit increases and the magnetic flux of the left magnetic circuit decreases.
In FIG. 6B, the magnetic fluxes of the left and right magnetic circuits are substantially equal,
In FIG. 6C, the magnetic flux in the right magnetic circuit is much larger. Up to this figure, the magnetic flux generated by the permanent magnet 15 is shunted for the magnetic flux of the left and right magnetic circuits, and the left and right sharing of the magnetic flux generated by the permanent magnet 15 depends on the magnitude of the magnetomotive force of the exciting coil 3. It can be said that has changed. Further, FIG. 6D shows that the magnetic flux generated by the magnetomotive force of the exciting coil 3 exceeds the magnetic flux of the permanent magnet 15 and does not pass through the permanent magnet 15.

FIG. 7 is a graph showing the relationship between the magnetomotive force of the exciting coil 3 and the electromagnetic force applied to the mover 2. The horizontal axis represents the magnetomotive force (kA) and the vertical axis represents the electromagnetic attraction force applied to the movable 2 (kgf). )
The positive value is the force to the right, and the negative value is the force to the left. F _l = about 15kg when the latch force is magnetomotive force of zero
f. When the magnetomotive force AT increases, the electromagnetic attraction force F increases in a substantially parabolic shape, and the magnetomotive force AT _max = 4.75 kA.
At that time, the maximum value becomes F _max = 8.84 kgf. Therefore, if the exciting coil 3 is excited with a value close to AT _max , a driving force for driving the mover 2 in the right direction in FIG. 1 with a force close to F _max can be obtained.

If the magnetomotive force AT becomes too large as shown in FIG. 6 (d), the electromagnetic attraction force will decrease. Therefore, in practice, it is not necessary to give the exciting coil 3 a magnetomotive force _{equal to} or _larger than the above-mentioned magnetomotive force AT _max . FIG. 8 is a graph showing the relationship of the electromagnetic attraction force to the magnetomotive force of the exciting coil 3 when the gap length of the gap 41 is zero, and FIG. 9 is when the magnetomotive force of the solenoid actuator with the gap length 41 of zero is zero. It is a magnetic flux distribution map of. The difference between FIG. 8 and FIG. 7 is that the scale of the vertical axis is 10 times that of FIG. Also, FIG. 9 is the same as FIG. 4 and FIG. 6 except for the dimensions of the gaps 41 and 42.

In these figures, the magnetic resistance of the left magnetic circuit is extremely small because the air gap length 41 is zero, so that most of the magnetic flux generated by the permanent magnet 15 flows to the left magnetic circuit. 4 has a considerable leakage magnetic flux component in the space where the left excitation coil 31 is provided, but there is a difference that it is very small in FIG. As a result, the magnetic flux density in the air gap 41 is much larger than in the case of FIG. 4, and the electromagnetic attraction force is large. The latching force in FIG. 8 is F _l = about 150 kgf, which is 10 times the value of F _l in FIG. On the other hand, the maximum electromagnetic attraction force F is F _max = 8.94 kgf, and the magnetomotive force AT at this time is AT _max = 3.75 AT.
That is, it can be seen that both F _max and AT _max are not so different from the case of FIG. 7.

Further, in FIG. 7, the range of the magnetomotive force in which the electromagnetic attraction force F becomes positive is as wide as 2 to 7.5 kAT, whereas in the case of FIG. 8, it is 2.7 to 4.5 kAT. It is a narrow range. This indicates that the allowable range of the value of the current flowing through the exciting coil 3 for releasing the latch is wide, and it is preferable to set the minimum air gap length in the latched state to a value of about 3 mm to control the exciting current. It can be said that there is an advantage that it is easy.

FIG. 10 is a sectional view of a solenoid actuator showing another embodiment of the present invention, and FIG. 11 is a sectional view taken along the line B--B of FIG. The subscript B is attached to and the detailed explanation is omitted. Figure 10
1 is different from FIG. 1 in that the position of the permanent magnet in FIG.
In contrast to FIG. 10, the mover core 22
It is provided integrally with B. Therefore, the permanent magnet 23 is provided in the central portion of the iron core 22B, without the permanent magnet being provided in the radial protrusion 14B. The permanent magnet 23 is provided at this position in order to maintain the left-right symmetry of the drawing.

Similar to FIG. 1, in this figure, the mover 2B is in a state of being latched to the left side, so that the gap 41 has a smaller gap length than the gap 42. The magnetic flux indicated by the chain line with an arrow in the magnetic circuit shows only the magnetic flux 55 of the left magnetic circuit, but of course the magnetic flux also flows in the right magnetic circuit, though it is slight. FIG. 12 is an explanatory diagram showing the flow of magnetic flux generated by the magnetomotive force generated by passing a current through the exciting coil 3 in the solenoid actuator of FIG. 10, and the sectional configuration is the same as that of FIG. Since this figure is similar to FIG. 5, detailed description thereof will be omitted, but the magnetic flux 53 of FIG. 5 corresponds to the magnetic flux 56 of this figure, and the magnetic flux 54 of FIG. 5 corresponds to the magnetic flux 57 of this figure.

FIG. 13 is a magnetic flux distribution chart in which the magnetic flux distribution is obtained by changing the current passed through the exciting coil 3 in the solenoid actuator of FIG. 10. The value of each magnetomotive force AT is AT = AT in FIG. 0, AT = in FIG.
1.75kAT, FIG. 13 (c) shows AT = 2.5kAT,
FIG. 13D shows AT = 5.0 kAT. Figure 4 above
13A, most of the magnetic flux generated by the permanent magnet 23 flows through the magnetic circuit on the left in FIG. 13A, the magnetomotive force is increased, and the magnetic flux of the magnetic circuit on the right is increased. Grows larger.

FIG. 14 is a graph showing the relationship between the magnetomotive force AT of the solenoid actuator of FIG. 10 and the electromagnetic attraction force F. Similar to FIG. 7, the horizontal axis and the vertical axis are the same, and therefore detailed description thereof will be omitted. The electromagnetic attraction force at the time of latch is F _l = 16.8kgf,
The maximum electromagnetic attraction force F _max = 1.3 kgf, and the magnetomotive force AT _{max at} this time is AT _max = 5.0 kAT. Latch force is F _l = 1
It is possible to maintain the latched state at 6.8 kgf and generate an electromagnetic attraction force of 1.3 kgf at maximum in order to drive the mover 2B by releasing the latched state.

In the case of the solenoid actuator according to this embodiment as well, instead of setting the minimum gap length of the gap 41 to zero, a structure of leaving a gap of about 3 mm is adopted, which is different from the case where it is zero. Is almost the same as described above. FIG. 15 is a sectional view of a solenoid actuator showing another embodiment of the present invention, and FIG. 16 is a sectional view taken along line CC of FIG. 15 is the same as FIG. 10 except that the braking pipe 6 is provided, and FIG. 16 is different from FIG. 11 in cross-sectional position. That is, in FIG. 11, BB, which is a left-right symmetry plane of the mover 2B.
16 is a cross-sectional view with respect to the cross-section, whereas FIG. 16 is a cross-sectional view taken along the line CC of the stator 1B, which is a left-right symmetrical surface. In FIGS. 15 and 16, the braking pipe 6 is in the shape of a cylinder that is in close contact with the outer diameters of the axial protrusions 12 and 13 and is disposed with a slight gap from the iron core 22B and the permanent magnet 23. is there.
In the cross-sectional views so far, although not particularly specified, the axial projections 12 and 13 and the mover iron core 22 or 22B are illustrated as having the same outer diameter. This is because there is no need to change the outer diameter between them. Therefore, the iron core 22B and the permanent magnet 23 in FIGS.
10 and 11 are the same as those in FIGS. 10 and 11, the outer diameters of the axial protrusions 12 and 13 are different, but the reference numerals are the same because they are slight differences.

By providing the braking pipe 6, the first gap 41 and the second gap 42 are in communication with each other only through the gap 61 between the braking pipe 6 and the iron core 22B. Assuming that there is no air leakage from the contact portion between the braking pipe 6 and the axial protruding portions 12 and 13 and the contact portion between the stator 1 and the shaft 21, the first gap 41 and the second gap 42 are separated from each other. The air is sealed. Now, the mover 2B is shown in FIG.
If the latch is released from the above state and it is driven to the right and moved, the gap length of the gap 41 increases and the gap 42 decreases. Since the size of the gap 61 is small, the gap 41,
The movement of the air corresponding to the change in the volume of 42 receives resistance, and a pressure difference is generated between the gaps 41 and 42. This pressure difference acts as a braking force that reduces the driving force of the mover 2B. This braking force increases as the moving speed of the mover 2B increases. That is, the provision of the braking pipe 6 causes the driving force to act, and when the movable member 2B is moved, braking that prevents abrupt movement is exerted. Therefore, the impact force when stopping at the opposite position is alleviated, and the wear of the member is reduced.

The provision of the brake pipe 6 is not limited to the solenoid actuator having the structure shown in FIG. 10, but the same effect can be obtained by applying the brake pipe 6 to the structure shown in FIG.

[0031]

According to the present invention, by adopting the above-mentioned structure, the magnetic flux generated by the permanent magnet can provide an electromagnetic attraction force for maintaining the latch of the mover, and the latch can be released. The driving force for moving the magnetic field in the opposite direction is obtained by passing a current through the exciting coil for excitation. Therefore, it is possible to obtain the effect that no electric power is required to obtain the latching force or a complicated mechanical latch mechanism is not required. Further, by providing the braking pipe, it is possible to obtain an effect that the solenoid actuator itself can have a braking action with a simple structure. In addition, by setting the minimum gap length of the gap that generates the electromagnetic attraction force to a predetermined value that is not zero, the electromagnetic attraction force at the time of latching is reduced, and the driving force when releasing the latch and moving the mover is reduced. Since the allowable range of the magnetomotive force required to obtain it becomes wider,
The effect of facilitating the control of the current flowing through the exciting coil is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a solenoid actuator showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line AA of FIG. 1 showing another embodiment different from that of FIG.

FIG. 4 is a magnetic flux distribution diagram of the solenoid actuator of FIG. 1 without excitation.

5 is an explanatory diagram of a magnetic flux distribution generated by a magnetomotive force of the solenoid actuator of FIG.

FIG. 6 is a magnetic flux distribution diagram according to the magnetomotive force that gradually increases with respect to FIG. 4.

7 is a graph showing the relationship between the magnetomotive force and the electromagnetic attraction force of the solenoid actuator of FIG.

FIG. 8 is a graph showing the relationship between magnetomotive force and electromagnetic attraction force when the gap on the latch side is set to zero in comparison with FIG.

9 is a magnetic flux distribution diagram when the size of the air gap on the left side of FIG. 4 is zero.

FIG. 10 is a sectional view of a solenoid actuator according to another embodiment of the present invention.

11 is a sectional view taken along line BB of FIG.

12 is an explanatory diagram of a magnetic flux distribution generated by a magnetomotive force of the solenoid actuator of FIG.

FIG. 13 is a magnetic flux distribution chart of the solenoid actuator of FIG.

14 is a graph showing the relationship between the magnetomotive force and the electromagnetic attraction force of the solenoid actuator of FIG.

FIG. 15 is a sectional view of a solenoid actuator showing still another embodiment of the present invention.

16 is a sectional view taken along line CC of FIG.

[Explanation of symbols]

 1, 1B Stator 11, 11B Frame 12, 13 Axial protrusion 14, 14B Radial protrusion 15 Permanent magnet 2, 2B Mover 21 Shaft 22, 22B Mover iron core 23 Permanent magnet 3, 31, 32 Excitation coil 41 , 42 Gap 6 Braking pipe 61 Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Teruo Horie Inventor Teruo Horie 3-15-31 Aoi, Higashi-ku, Nagoya Sumitomo Life Chikusa Building, Aichi Electric Works Co., Ltd. 20−20 Kunitomo Electric Manufacturing Co., Ltd.

Claims (6)

[Claims] 1. A stator comprising an axially symmetric ferromagnetic material, an axially symmetric mover movably penetrating the axial center of the stator, and a solenoid-like exciting coil arranged around the mover. , In a solenoid actuator in which a current is passed through an exciting coil to excite a magnetic circuit formed by a stator and a mover, and the mover is driven in the axial direction by an electromagnetic force, the stator causes the lid parts at both ends and A can-shaped frame consisting of a cylindrical portion to be connected, a ring-shaped radial protruding portion protruding toward the inner diameter side of the axial center portion of the cylindrical portion, and a cylindrical shape protruding axially inward from the center of both lid portions. The rod is composed of two axial protrusions, and the mover is fixed to a rod-shaped shaft made of a non-magnetic material that movably penetrates the center of both lids of the frame and the axial protrusions, and the axial center of this shaft. Tubular mounted It consists of Doko core, exciting coil,
A first exciting coil provided in a space between one lid portion of the frame and the radial protruding portion; and a second exciting coil provided in a space between the radial protruding portion and the other lid portion, The innermost surface of the radial protrusion faces the outer surface of the mover core with a gap, and a first gap, which is a gap between the one axial projection and the mover core, and the other axial direction. The sum of the gap lengths of the protrusion and the second gap, which is the gap between the mover iron core, is set to a predetermined value that is equal to or greater than the movable distance of the mover, and a part of the radial protrusion extends in the radial direction. A solenoid actuator comprising a magnetized permanent magnet. 2. The permanent magnet of the solenoid actuator according to claim 1, wherein the permanent magnet is provided as a part of the radial projection and is provided in the axial center of the mover core and is magnetized in the axial direction. Characteristic solenoid actuator. 3. The solenoid actuator according to claim 1, wherein the permanent magnet has a ring shape. 4. The solenoid actuator according to claim 1, wherein the permanent magnet is divided in the circumferential direction. 5. A braking pipe made of a non-magnetic material is provided on the outer diameter side of the mover core so as to closely contact the outer diameter side of the two axially projecting portions, with a predetermined gap therebetween. The solenoid actuator according to claim 1, 2, 3, or 4. 6. The minimum value of the void length of the first and second voids is a predetermined value which is not zero, and
The solenoid actuator according to 3, 4, or 5.