Electromagnetic suspension

Abstract

The present invention provides an electromagnetic suspension that suppresses interference with other parts or devices, can be mounted in a narrow space, has small thrust pulsation, large thrust, and high vibration damping performance for high-frequency vibration sources. The electromagnetic suspension of the present invention is an electromagnetic suspension using a linear motor, the linear motor having an armature composed of a winding and a magnetic body; and a permanent magnet portion disposed on the outer peripheral side of the armature and composed of a permanent magnet and a cylindrical magnetic body, the armature and the permanent magnet portion linearly drive relative to each other, and the electromagnetic suspension is characterized in that a concave portion recessed with respect to the outer peripheral portion and a convex portion protruding with respect to the outer peripheral portion are disposed on the same circumference of the outer peripheral portion of the cylindrical magnetic body.

Description

Technical Field

[0001] The present invention relates to an electromagnetic suspension using a linear motor. Background Art

[0002] An electromagnetic suspension using a linear motor generally has a cylindrical permanent magnet portion in which permanent magnets are arranged on the inner peripheral side, and an armature movably inserted into the permanent magnet portion.

[0003] As background art in this technical field, there is Japanese Patent Application Laid-Open No. 2013-29159 (hereinafter referred to as Patent Document 1). Patent Document 1 describes an electromagnetic suspension using a linear motor, in which coils are arranged on the outer peripheral side of a stator, and permanent magnets are arranged on the inner peripheral side of a mover (refer to the abstract).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-29159 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] An electromagnetic suspension using a linear motor can generate a damping force without passing through a speed reduction mechanism such as a lever and a gear arranged in a conventional hydraulic suspension, has high responsiveness, and also improves vibration damping performance for a high-frequency vibration source.

[0009] On the other hand, in an electromagnetic suspension, since the linear motor directly generates a damping force and does not pass through a speed reduction mechanism, the linear motor is large in size. Therefore, compared with a conventional hydraulic suspension, the electromagnetic suspension has a problem that its size and diameter are large.

[0010] Moreover, especially when replacing a conventional hydraulic suspension with an electromagnetic suspension in order to improve the vibration damping performance of an engine-driven vehicle, the size and diameter of the electromagnetic suspension become large, and there is a problem of interference (contact) with other parts or devices.

[0011] Furthermore, in recent years, due to the problem of CO2 reduction, the number of electric vehicles such as HEV and EV is increasing. Since an electric vehicle is equipped with a small engine and does not have the engine itself, the engine compartment is also miniaturized, and the space for mounting an electromagnetic suspension becomes smaller.

[0012] Compared with a vehicle, an electric vehicle has to mount an electromagnetic suspension in a smaller space, and furthermore, there is a problem of interference with other parts or devices.

[0013] Patent Document 1 describes an electromagnetic suspension using a linear motor. However, Patent Document 1 does not describe the problem of interference with other parts or devices due to the size and diameter of the electromagnetic suspension when it is mounted on an automobile or an electric vehicle.

[0014] Therefore, the present invention provides an electromagnetic suspension that suppresses (avoids) interference with other parts or devices, can be mounted in a narrow space (small space), has small thrust pulsation, large thrust, and high damping performance for high-frequency vibration sources.

[0015] Technical means for solving the problem

[0016] To solve the above problems, the electromagnetic suspension of the present invention is an electromagnetic suspension using a linear motor, the linear motor having an armature composed of a winding and a magnetic body; and a permanent magnet portion disposed on the outer peripheral side of the armature and composed of a permanent magnet and a cylindrical magnetic body, the armature and the permanent magnet portion linearly driving relative to each other, characterized in that a concave portion recessed with respect to the outer peripheral portion and a convex portion protruding with respect to the outer peripheral portion are disposed on the same circumference of the outer peripheral portion of the cylindrical magnetic body.

[0017] Effects of the invention

[0018] According to the present invention, an electromagnetic suspension can be provided that suppresses (avoids) interference with other parts or devices, can be mounted in a narrow space (small space), has small thrust pulsation, large thrust, and high damping performance for high-frequency vibration sources.

[0019] Furthermore, problems, configurations, and effects other than the above will be clarified by the description of the following embodiments. Description of the drawings

[0020] Figure 1 An explanatory diagram for illustrating the linear motor 1 described in Embodiment 1 in a three-dimensional manner.

[0021] Figure 2 An explanatory diagram for cutting the linear motor 1 described in Embodiment 1 with the YZ plane.

[0022] Figure 3 An explanatory diagram for illustrating the relationship between the relative positions of the permanent magnet portion 20 and the armature 10 of the linear motor 1 described in Embodiment 1 and the thrust.

[0023] Figure 4 An explanatory diagram for illustrating the electromagnetic suspension 2 described in Embodiment 1 in a three-dimensional manner.

[0024] Figure 5 An explanatory diagram for illustrating the YZ cross-section of the electromagnetic suspension 2 described in Embodiment 1.

[0025] Figure 6Explanation diagram for a vehicle 80 equipped with the electromagnetic suspension 2 described in Embodiment 1.

[0026] Figure 7 Explanation diagram for the YZ cross-section of the magnetic body 22 described in Embodiment 1.

[0027] Figure 8 Explanation diagram for three-dimensionally illustrating the linear motor 1 described in Embodiment 2.

[0028] Figure 9 Explanation diagram for cutting the linear motor 1 described in Embodiment 2 with the YZ plane.

[0029] Figure 10 Explanation diagram for three-dimensionally illustrating the linear motor 1 described in Embodiment 3.

[0030] Figure 11 Explanation diagram for the XY cross-section of the linear motor 1 described in Embodiment 3.

[0031] Figure 12 Explanation diagram for Configuration Example 1 of the convex portion 30 described in Embodiment 3.

[0032] Figure 13 Explanation diagram for Configuration Example 2 of the convex portion 30 described in Embodiment 3.

[0033] Figure 14 Explanation diagram for Configuration Example 3 of the convex portion 30 described in Embodiment 3.

[0034] Figure 15 Explanation diagram for the configuration example of the convex portion 30 described in Embodiment 4.

[0035] Figure 16 Explanation diagram for cutting the linear motor 1 described in Embodiment 5 with the YZ plane. Detailed implementation manners

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Furthermore, components that are substantially the same or similar are denoted by the same reference numerals, and in cases where the description is repetitive, the description may be omitted.

[0037] Embodiment 1

[0038] First, the linear motor 1 described in Embodiment 1 will be described three-dimensionally.

[0039] Figure 1 Explanation diagram for three-dimensionally illustrating the linear motor 1 described in Embodiment 1.

[0040] The linear motor 1 described in Embodiment 1 includes a cylindrical permanent magnet portion 20 having a permanent magnet disposed on the inner peripheral side, and an armature 10 movably inserted into the permanent magnet portion 20.

[0041] Furthermore, Figure 1 The shown linear motor 1 has been removed from the electromagnetic suspension to show the main parts of the linear motor 1, and other spring parts (springs, spring seats, etc.), link parts (link rods, etc.) required for the electromagnetic suspension are not shown.

[0042] Furthermore, the linear motor 1 has a concave portion 40 and a convex portion 30 on the surface of the permanent magnet portion 20.

[0043] Next, the linear motor 1 described in Embodiment 1 is cut along the YZ plane for illustration.

[0044] Figure 2 It is an explanatory diagram for cutting and illustrating the linear motor 1 described in Embodiment 1 along the YZ plane.

[0045] The linear motor 1 has a permanent magnet portion 20 composed of a plurality of permanent magnets 21 arranged in the Z direction and a cylindrical magnetic body (the outer cylinder of the outer peripheral portion of the linear motor 1) 22 arranged on the outer peripheral side thereof; and an armature 10 composed of a magnetic body 11 constituting a pivot tooth and a plurality of windings (coils) 12 arranged in the Z direction, which is arranged to face the inner peripheral side of the permanent magnet 21.

[0046] That is to say, the linear motor 1 has an armature 10 with windings 12 arranged on the outer peripheral side and a permanent magnet portion 20 with permanent magnets 21 arranged on the inner peripheral side. The linear motor 1 has an armature 10 with windings 12 arranged between the magnetic bodies 11 and a permanent magnet portion 20 with a magnetic body 22 arranged on the outer peripheral side of the permanent magnets 21. And, the permanent magnet portion 20 is arranged on the outer peripheral side of the armature 10.

[0047] Thus, in the linear motor 1, the permanent magnet portion 20 moves relative to the armature 10 in the Z direction (linear drive), thereby generating a force in the Z direction, that is, thrust.

[0048] Furthermore, the linear motor 1 has a concave portion 40 and a convex portion 30 on the surface of the permanent magnet portion 20, that is, on the magnetic body 22.

[0049] In Embodiment 1, the linear motor 1 has a "5-pole 6-slot structure" in which magnetic bodies 11 constituting 6 pivot teeth are arranged for 5 permanent magnets 21. This structure is an example of the linear motor 1, and is not limited to this structure as long as the same effect can be obtained.

[0050] In Embodiment 1, the linear motor 1 is a three-phase motor to which three-phase alternating current is applied to 6 windings 12, and by changing the current value applied to the 6 windings 12, an arbitrary thrust can be generated at an arbitrary position. This thrust is generated by the interaction between the magnetic flux generated by the permanent magnets 21 and the magnetic flux generated by the windings 12.

[0051] Here, when the linear motor 1 is arranged in a narrow space where other parts or devices are arranged, the linear motor 1 may interfere with other parts or devices, and the magnetic body 22 of the interfering part must be cut off. The cut-off part becomes a recessed part 40 that is recessed compared to the outer peripheral part of the cylindrical magnetic body 22.

[0052] The linear motor 1 determines the magnetic flux in consideration of the required thrust or the maximum thrust, and forms a magnetic circuit (the path of the magnetic flux of the magnet) corresponding to the magnetic flux. Since the magnetic body 22 forms the magnetic circuit, when the recessed part 40 is formed on the magnetic body 22, phenomena such as pulsating increase in thrust and reduction in thrust occur. Therefore, a convex part 30 made of a magnetic body and bulging (protruding) compared to the outer peripheral part of the cylindrical magnetic body 22 is arranged on the magnetic body 22 to suppress the pulsation of the thrust and increase the thrust.

[0053] In the first embodiment, the convex part 30 is a strip-shaped magnetic body attached to the magnetic body 22. However, as long as the same effect can be obtained, it is not limited to this structure. The convex part 30 can be integrally formed with the magnetic body 22, or can be formed as a different individual from the magnetic body 22. Furthermore, the recessed part 40 is integrally formed with the magnetic body 22.

[0054] Furthermore, when a strip-shaped magnetic body is used for the convex part 30, an adhesive or the like may be interposed between the convex part 30 and the magnetic body 22. In this case, it is assumed that the magnetic resistance increases due to the gap generated by the adhesive or the like. In this case, it is dealt with by increasing the thickness of the convex part 30, widening the width of the convex part 30, or using a material with a small magnetic resistance.

[0055] By forming the convex part 30 and the magnetic body 22 as different individuals, for example, by using a strip-shaped magnetic body for the convex part 30, the magnetic properties can be adjusted separately.

[0056] In this way, the linear motor 1 can suppress the pulsation of the thrust, increase the thrust, and suppress the interference with other parts or devices by arranging the recessed part 40 and the convex part 30 on the surface of the permanent magnet part 20, that is, the magnetic body 22, and thus the linear motor 1 can be mounted in a narrow space.

[0057] Next, the relationship between the relative position of the permanent magnet part 20 and the armature 10 of the linear motor 1 described in the first embodiment and the thrust will be described.

[0058] Figure 3 It is an explanatory diagram for explaining the relationship between the relative position of the permanent magnet part 20 and the armature 10 of the linear motor 1 described in the first embodiment and the thrust.

[0059] Figure 3 is shown in

[0060] (1) The case where the recessed part 40 and the convex part 30 are not arranged on the magnetic body 22 (dashed line 301)

[0061] (2) The case where the concave portion 40 is formed on the magnetic body 22 (the convex portion 30 is not arranged) (dashed-dotted line 302)

[0062] (3) The case where the concave portion 40 and the convex portion 30 are arranged on the magnetic body 22 (solid line 303)

[0063] The thrust characteristics below (the relationship between the relative position of the permanent magnet portion 20 and the armature 10 and the thrust).

[0064] In the case where the concave portion 40 and the convex portion 30 are not arranged on the magnetic body 22, a magnetic circuit corresponding to the magnetic flux determined in consideration of the required thrust or the maximum thrust is formed, and it is the pulsation of the normal thrust and the thrust. The thrust characteristics at this time are Figure 3 the appearance of the dashed line 301 of.

[0065] In the case where the concave portion 40 is formed on the magnetic body 22 (the convex portion 30 is not arranged), magnetic flux saturation occurs due to the concave portion 40, an imbalance of the magnetic flux generated by the three-phase alternating current appears, the pulsation of the thrust increases, and the thrust decreases. The thrust characteristics at this time are Figure 3 the appearance of the dashed-dotted line 302 of.

[0066] In order to eliminate such a phenomenon of increased thrust pulsation and decreased thrust, that is, in order to suppress the thrust pulsation and increase the thrust, the convex portion 30 is arranged on the magnetic body 22.

[0067] In the case where the concave portion 40 and the convex portion 30 are arranged on the magnetic body 22, the convex portion 30 suppresses the increase in the magnetic resistance of the magnetic circuit reduced due to the concave portion 40, suppresses the thrust pulsation, and increases the thrust. Therefore, the thrust characteristics at this time are Figure 3 the appearance of the solid line 303 of, and is the same as Figure 3 the dashed line 301 of. That is, it is the pulsation of the normal thrust and the thrust.

[0068] In this way, by arranging the concave portion 40 and the convex portion 30 on the surface of the magnetic body 22, it is possible to eliminate the phenomenon of increased thrust pulsation and decreased thrust, and suppress the interference with other parts or equipment and mount the linear motor 1 in a narrow space.

[0069] Moreover, the concave portion 40 and the convex portion 30 are preferably arranged on the same circumference of the magnetic body 22. That is, the convex portion 30 is preferably arranged on the magnetic body 22 on the same circumference where the concave portion 40 is formed. In addition, it is preferable that the volume of the convex portion 30 is the same as the volume of the concave portion 40 or the volume of the convex portion 30 is larger than the volume of the concave portion 40.

[0070] The reason is that the convex portion 30 suppresses an increase in the magnetic resistance of the magnetic circuit reduced by the concave portion 40. Thereby, the convex portion 30 suppresses the pulsation of the thrust and increases the thrust. Next, the electromagnetic suspension 2 described in the first embodiment will be described three-dimensionally.

[0071] Figure 4 FIG. is an explanatory diagram for three-dimensionally explaining the electromagnetic suspension 2 described in the first embodiment.

[0072] The electromagnetic suspension 2 described in the first embodiment includes a linear motor 1, a cylindrical portion end cover 41, a spring 50, a lower spring seat 51, an upper spring seat 52, a spring lower side link 60, and a vehicle side link 61.

[0073] The cylindrical portion end cover 41 is disposed at one end of the linear motor 1 (permanent magnet portion 20). The spring lower side link 60 is coupled to the cylindrical portion end cover 41. Components such as a tire (wheel) (not shown), a lower arm (not shown), and a brake (not shown) disposed in the vehicle are coupled to the top end of the spring lower side link 60.

[0074] The vehicle side link 61 is disposed on the other side of the linear motor 1 (permanent magnet portion 20). Components such as an upper bracket (not shown) disposed in the vehicle are coupled to the top end of the vehicle side link 61.

[0075] The lower spring seat 51 is disposed on the outer peripheral side of the linear motor 1 (permanent magnet portion 20) and at the middle portion of the linear motor 1 (permanent magnet portion 20). The upper spring seat 52 is disposed on the vehicle side link 61 side. The spring 50 is disposed on the outer peripheral side of the linear motor 1 (permanent magnet portion 20) so as to be sandwiched between the upper spring seat 52 and the lower spring seat 51.

[0076] And, on the outer peripheral side of the linear motor 1 (permanent magnet portion 20) and on the surface of the linear motor 1 (permanent magnet portion 20) in the region where the spring 50 is not disposed, that is, on the surface of the magnetic body 22 and on the same circumference, there are provided a concave portion 40 and a convex portion 30.

[0077] Furthermore, the linear motor 1 disposes the permanent magnet portion 20 on the outer peripheral side of the armature 10 and makes the permanent magnet 21 of the permanent magnet portion 20 face the magnetic body 11 and the winding 12 of the armature 10, thereby increasing the facing area between the permanent magnet 21 and the magnetic body 11 and the winding 12. Thus, by using such a linear motor 1, an electromagnetic suspension 2 with a large thrust can be realized.

[0078] Next, the YZ cross section of the electromagnetic suspension 2 described in the first embodiment will be described.

[0079] Figure 5 FIG. is an explanatory diagram for explaining the YZ cross section of the electromagnetic suspension 2 described in the first embodiment.

[0080] The electromagnetic suspension 2 has an armature 10 composed of a magnetic body 11 and a winding 12, and has a permanent magnet portion 20 composed of a permanent magnet 21 and a magnetic body 22. A vehicle-side connecting rod 61 is coupled to the armature 10, and a sub-spring connecting rod 60 is coupled to the permanent magnet portion 20 via a cylinder portion end cap 41.

[0081] Thereby, the electromagnetic suspension 2 relatively displaces the sub-spring side and the vehicle side, and controls the vibration of the vehicle by means of a spring 50 and a linear motor 1 disposed between the sub-spring side and the vehicle side.

[0082] Moreover, a concave portion 40 and a convex portion 30 are disposed on the surface of the linear motor 1 in consideration of the positions of parts or devices that may interfere with the electromagnetic suspension 2. Thereby, the electromagnetic suspension 2 does not interfere with other parts or devices.

[0083] Next, a vehicle 80 equipped with the electromagnetic suspension 2 described in Embodiment 1 will be described.

[0084] Figure 6 It is an explanatory diagram for explaining the vehicle 80 equipped with the electromagnetic suspension 2 described in Embodiment 1.

[0085] The vehicle (automobile, electric vehicle, vehicle body) 80 described in Embodiment 1 has an electromagnetic suspension 2, a sub-spring member 90, and a vehicle-side member 91.

[0086] The electromagnetic suspension 2 is coupled to the sub-spring member 90 and the vehicle-side member 91.

[0087] Parts or devices that may interfere with the electromagnetic suspension 2 are disposed on either the sub-spring member 90 side or the vehicle-side member 91 side. In addition, there are parts or devices that couple the sub-spring member 90 side and the vehicle-side member 91 side, such as a knuckle (not shown).

[0088] A concave portion 40 and a convex portion 30 are disposed on the surface of the linear motor 1 in consideration of the positions of such parts or devices that may interfere with the electromagnetic suspension 2. Thereby, the electromagnetic suspension 2 does not interfere with other parts or devices.

[0089] Thus, by disposing the concave portion 40 and the convex portion 30 on the surface of the linear motor 1 on the outer peripheral side of the linear motor 1 and in a region where the spring 50 is not disposed and on the same circumference, the electromagnetic suspension 2 can suppress interference with other parts or devices.

[0090] Next, a YZ cross-section of the magnetic body 22 described in Embodiment 1 will be described.

[0091] Figure 7 It is an explanatory diagram for explaining the YZ cross-section of the magnetic body 22 described in Embodiment 1.

[0092] The magnetic body 22 described in Embodiment 1 has a concave portion 40 and a convex portion 30.

[0093] Providing the recess 40 on the magnetic body 22 reduces the cross-sectional area of the magnetic path of the recess cross-section 42 and increases the magnetic resistance of the magnetic path. On the other hand, by providing the convex portion 30 on the magnetic body 22, the cross-sectional area of the magnetic path of the convex portion cross-section 31 increases, and the increase in the magnetic resistance of the magnetic path is suppressed.

[0094] Furthermore, here, the width of the recess 40 (the length in the Z direction) is made the same as the width of the convex portion 30 (the length in the Z direction).

[0095] And, the cross-sectional area of the convex portion 30 (the cross-sectional area of the convex portion cross-section 31) is set to be equal to or greater than the cross-sectional area of the recess 40 (the cross-sectional area of the recess cross-section 42). That is, it is set to "the cross-sectional area of the convex portion cross-section 31 ≥ the cross-sectional area of the recess cross-section 42".

[0096] Here, the cross-sectional area of the convex portion 30 (the cross-sectional area of the convex portion cross-section 31) is the cross-sectional area of the portion that bulges (protrudes) with respect to the outer peripheral portion of the cylindrical magnetic body 22, and the cross-sectional area of the recess 40 (the cross-sectional area of the recess cross-section 42) is the cross-sectional area of the portion that is recessed with respect to the outer peripheral portion of the cylindrical magnetic body 22.

[0097] In addition, in the case of using a material for the convex portion 30 having a higher magnetic permeability than the material of the magnetic body 22, compared with the case of using a material having the same magnetic permeability as the material of the magnetic body 22 for the convex portion 30, the cross-sectional area of the convex portion cross-section 31 can be reduced.

[0098] In this way, by using a material for the convex portion 30 having a higher magnetic permeability than the material of the magnetic body 22, the cross-sectional area of the convex portion cross-section 31 can be reduced, so that the protruding portion of the convex portion 30 can be minimized. In addition, by using a material for the convex portion 30 having a smaller magnetic resistance than the material of the magnetic body 22, the cross-sectional area of the convex portion cross-section 31 can be reduced, so that the protruding portion of the convex portion 30 can be minimized.

[0099] That is, it is sufficient to provide the convex portion 30 on the magnetic body 22 so that the same magnetic flux as the magnetic flux that is reduced by forming the recess 40 on the magnetic body 22 (the magnetic flux that should originally flow in the recess cross-section 42) flows in the convex portion cross-section 31.

[0100] In this way, the electromagnetic suspension 2 described in the first embodiment uses the linear motor 1, and the linear motor 1 includes an armature 10 composed of a winding 12 and a magnetic body 11; and a permanent magnet portion 20 disposed on the outer peripheral side of the armature 10 and composed of a permanent magnet 21 and a cylindrical magnetic body 22, and the armature 10 linearly drives relative to the permanent magnet portion 20.

[0101] Further, a concave portion 40 that is recessed with respect to the outer peripheral portion and a convex portion 30 that bulges (protrudes) with respect to the outer peripheral portion are arranged on the same circumference of the outer peripheral portion of the cylindrical magnetic body 22.

[0102] According to Embodiment 1, it is possible to provide an in-vehicle electromagnetic suspension 2 of a linear motor type with high responsiveness that suppresses interference with other parts or devices and can be mounted in a narrow space. Further, according to Embodiment 1, it is possible to provide an in-vehicle electromagnetic suspension 2 that uses (mounts) a linear motor 1 with small thrust pulsation, large thrust, and high vibration damping performance for a high-frequency vibration source.

[0103] Furthermore, in Embodiment 1, the in-vehicle electromagnetic suspension 2 has been described, but the electromagnetic suspension 2 described in Embodiment 1 can also be used for a vibration damping device for other products other than in-vehicle use.

[0104] Embodiment 2

[0105] Next, the linear motor 1 described in Embodiment 2 will be described three-dimensionally, and the linear motor 1 described in Embodiment 2 will be cut along the YZ plane for description.

[0106] Figure 8 FIG. is an explanatory diagram for three-dimensionally describing the linear motor 1 described in Embodiment 2, Figure 9 FIG. is an explanatory diagram for cutting and describing the linear motor 1 described in Embodiment 2 along the YZ plane.

[0107] The linear motor 1 described in Embodiment 2 is different from the linear motor 1 described in Embodiment 1, especially in that the concave portion 40 and the convex portion 30 are different. The other basic configurations are substantially the same as those of the linear motor 1 described in Embodiment 1 (compared with Embodiment 1, the magnetic body 11 is longer on the side of the spring lower side link 60).

[0108] The linear motor 1 forms circumferential (within a range of 360 degrees) grooves of the same width and the same depth on the cylindrical magnetic body 22. Further, the linear motor 1 arranges the convex portion 30 in a part of the circumferential groove, so that the concave portion 40 is formed in the other part of the circumferential groove where the convex portion 30 is not arranged.

[0109] That is, the concave portion 40 and the convex portion 30 are arranged on the surface of the linear motor 1 (the surface of the permanent magnet portion 20, the surface of the magnetic body 22) on the outer peripheral side of the linear motor 1 and in the region where the spring 50 is not arranged and on the same circumference.

[0110] Furthermore, the convex portion 30 is preferably configured as a different entity from the magnetic body 22. The convex portion 30 may also be integrally formed with the magnetic body 22. The concave portion 40 is integrally formed with the magnetic body 22.

[0111] Thus, by forming a circumferential groove and a recess 40 in the magnetic body 22, the manufacturability of the magnetic body 22 (the permanent magnet portion 20, the linear motor 1) is improved.

[0112] Moreover, with respect to the convex portion 30, particularly in order to suppress the interference of the convex portion 30 when the object moves in the X direction, and in addition, in order to suppress the interference with other parts or devices, a chamfered portion 32 formed by chamfering the corner portion of the convex portion 30 is formed at the corner portion of the convex portion 30.

[0113] Furthermore, regarding the chamfering method of the chamfered portion 32, R-shaped chamfering or C-shaped chamfering is considered. And the chamfered portion 32 may have a multi-faceted cross-section or a curved cross-section.

[0114] By forming the chamfered portion 32, the installability of the linear motor 1 for the electromagnetic suspension 2 is improved.

[0115] Furthermore, when the vehicle 80 changes its attitude greatly, such as when the vehicle 80 crosses a large height difference, the degree of interference with other parts or devices also increases.

[0116] And in such a case, the positions of the parts or devices arranged below the spring and the parts or devices arranged on the vehicle side change relative to the electromagnetic suspension 2.

[0117] That is, the positions of the parts or devices that interfere with the electromagnetic suspension 2 change relative to the electromagnetic suspension 2.

[0118] That is, especially when the electromagnetic suspension 2 (linear motor 1) is arranged in a narrow space where other parts or devices are arranged, for the unpredictable and irregular behavior of the vehicle 80, the linear motor 1 may also interfere with other parts or devices.

[0119] Therefore, it is preferable to arrange the convex portion 30 relative to the magnetic body 22 so as to be rotatable relative to each other in the XY plane. That is, the convex portion 30 preferably rotates relative to the magnetic body 22.

[0120] Thereby, the degree of interference with other parts or devices is reduced, and the interference with other parts or devices that may occur continuously is suppressed.

[0121] That is, the convex portion 30 is arranged rotatably relative to the magnetic body 22, whereby the position of the recess 40 changes. By changing the position of the recess 40, for the behavior of the vehicle 80, the degree of interference with other parts or devices can also be reduced, the interference with other parts or devices that may occur continuously can be suppressed, and furthermore, the damage to other parts or devices (preventing the deformation of other parts or devices) can be suppressed. Thereby, the reliability of the electromagnetic suspension 2 is further improved.

[0122] Embodiment 3

[0123] Next, the linear motor 1 described in Embodiment 3 will be described in three dimensions, and the XY cross-section of the linear motor 1 described in Embodiment 3 will be described.

[0124] Figure 10 FIG. is an explanatory diagram for explaining the linear motor 1 described in Embodiment 3 in three dimensions. Figure 11 FIG. is an explanatory diagram for explaining the XY cross-section of the linear motor 1 described in Embodiment 3.

[0125] Compared with the linear motor 1 described in Embodiment 2, the concave portion 40 and the convex portion 30 of the linear motor 1 described in Embodiment 3 are different, and the other basic configurations are the same as those of the linear motor 1 described in Embodiment 2.

[0126] The linear motor 1 forms a circumferential groove on the cylindrical magnetic body 22. Further, the linear motor 1 disposes the bifurcated convex portion 30 at a part of the circumferential groove, so that a concave portion 40 is formed in the other part of the circumferential groove where the bifurcated convex portion 30 is not disposed.

[0127] Furthermore, for the purpose of explanation, Figure 10 the bifurcated convex portion 30 is shown separated from the permanent magnet portion 20.

[0128] The bifurcated convex portions 30 are respectively press-fitted into the circumferential groove and disposed separately, for example, whereby the manufacturability of the convex portion 30 is improved. Further, by using the bifurcated convex portion 30, the convex portion 30 can be disposed after the electromagnetic suspension 2 is mounted on the vehicle 80, so that the workability is improved, and the performance adjustment of the electromagnetic suspension 2 can be achieved.

[0129] In addition, the number of divisions of the convex portion 30 (the convex portion 30 is divided into a plurality of parts) can be increased and adjusted according to the required characteristics. Further, the number of divisions of the convex portion 30 can be adjusted to form a plurality of concave portions 40.

[0130] In addition, it is preferable to dispose the convex portion 30 on the magnetic body 22 so as to be rotatable in the XY plane. Thereby, the degree of interference with other parts or devices is reduced, and the interference with other parts or devices that may occur continuously is suppressed.

[0131] Next, a configuration example of the convex portion 30 described in Embodiment 3 will be described.

[0132] Figure 12 、 Figure 13 、 Figure 14 FIG. is an explanatory diagram for explaining Configuration Example 1, Configuration Example 2, and Configuration Example 3 of the convex portion 30 described in Embodiment 3.

[0133] By disposing the convex portion 30 after mounting the electromagnetic suspension 2 on the vehicle 80, the workability is improved, and the performance adjustment of the electromagnetic suspension 2 can be achieved.

[0134] Figure 12 The shown structural example 1 is a structural example in which the convex portion 30 is divided into two, the same flange portions are disposed on the same single side of each, holes are formed in the flange portions, and the divided convex portions 30 are screwed together. Thus, the convex portion 30 can be manufactured at low cost and easily installed.

[0135] Figure 13 The shown structural example 2 is a structural example in which the convex portion 30 is divided into two, the wall thickness of each is thickened, and a chamfered portion 32 formed by chamfering the corner portion of the convex portion 30 is formed at the corner portion of the convex portion 30 to suppress interference with other parts or devices. And it is a structural example in which the same flange portions are disposed on the same single side of each, holes are formed in the flange portions, counterbores are formed in the flange portions, and the divided convex portions 30 are screwed together. Thus, the installability of the linear motor 1 for the electromagnetic suspension 2 is improved, and by means of the counterbores, damage to, for example, a brake hose caused by screws can be suppressed.

[0136] Figure 14 The shown structural example 3 is a structural example in which the convex portion 30 is divided into two, the wall thickness of each is thickened, and a chamfered portion 32 formed by chamfering the corner portion of the convex portion 30 is formed at the corner portion of the convex portion 30 to suppress interference with other parts or devices. And it is a structural example in which holes are directly formed in the thickened convex portion 30 without forming flange portions and the divided convex portions 30 are screwed together. Thus, the installability of the linear motor 1 for the electromagnetic suspension 2 is improved, and damage to, for example, a brake hose caused by the flange portions can be suppressed.

[0137] Example 4

[0138] Next, a structural example of the convex portion 30 described in Example 4 will be described.

[0139] Figure 15 It is an explanatory diagram for explaining the structural example of the convex portion 30 described in Example 4.

[0140] The linear motor 1 described in Example 4 has a difference in the convex portion 30 compared with the linear motor 1 described in Example 2, and the other basic structure is the same as the linear motor 1 described in Example 2.

[0141] Figure 15 The shown structural example is a structural example in which the convex portion 30 uses a member made of an elastic magnetic body. And the convex portion 30 is integrally formed, and has a portion that curves outwardly in the portion where the concave portion 40 is formed. Thus, by inserting the convex portion 30 from Figure 15 below upward into the circumferential groove formed in the magnetic body 22, the convex portion 30 can be simply disposed.

[0142] Example 5

[0143] Next, the linear motor 1 described in Example 5 will be described by cutting it with the YZ plane.

[0144] Figure 16 FIG. is an explanatory diagram for describing the linear motor 1 described in Example 5 by cutting it with the YZ plane.

[0145] Compared with the linear motor 1 described in Example 3, there are differences at both ends of the permanent magnet portion 20 of the linear motor 1 described in Example 5, and the other basic configuration is the same as that of the linear motor 1 described in Example 3.

[0146] The linear motor 1 forms threaded portions 25 at both ends of the permanent magnet portion 20. Thus, the permanent magnet portion 20 (linear motor 1 (electromagnetic suspension 2)) can be fixed to the lower side of the spring or the vehicle side using the threaded portions 25 formed on the permanent magnet portion 20.

[0147] Furthermore, at this time, the permanent magnet portion 20 must be rotated about the Z axis. Here, when there is a possibility that the parts or devices arranged on the lower side of the spring or the parts or devices arranged on the vehicle side may interfere with the permanent magnet portion 20, the permanent magnet portion 20 cannot be rotated about the Z axis.

[0148] Therefore, a circumferential groove is formed within a range of 360 degrees on the same circumference of the magnetic body 22. Thus, it is possible to avoid, within a range of 360 degrees, the parts or devices arranged on the lower side of the spring or the parts or devices arranged on the vehicle side that may interfere with the permanent magnet portion 20.

[0149] Then, by rotating the permanent magnet portion 20 about the Z axis, the permanent magnet portion 20 can be fixed to the lower side of the spring or the vehicle side using the threaded portions 25 formed on the permanent magnet portion 20.

[0150] Furthermore, convex portions 30 are arranged in a part of the circumferential groove, and concave portions 40 are formed in the other parts of the circumferential groove where the convex portions 30 are not arranged. The convex portions 30 can be arranged after the electromagnetic suspension 2 is mounted on the vehicle 80, so that the workability is improved and the performance adjustment of the electromagnetic suspension 2 can be achieved.

[0151] Thus, the permanent magnet portion 20 can be firmly fixed to the lower side of the spring or the vehicle side, improving the reliability of the linear motor 1 (electromagnetic suspension 2).

[0152] Furthermore, the present invention includes various modification examples and is not limited to the above-described embodiments. The above-described embodiments are detailed descriptions for explaining the present invention in an easy-to-understand manner and are not necessarily limited to all the configurations described.

[0153] In addition, a part of the configuration of a certain embodiment can be replaced with a part of the configuration of other embodiments, or the configuration of other embodiments can be added to the configuration of a certain embodiment.

[0154] Symbol Explanation

[0155] 1... Linear motor, 2... Electromagnetic suspension, 10... Armature, 11... Magnetic body, 12... Winding, 20... Permanent magnet part, 21... Permanent magnet, 22... Magnetic body, 25... Threaded part, 30... Convex part, 31... Convex part cross-section, 32... Chamfered part, 40... Concave part, 41... End cover of cylindrical part, 42... Concave part cross-section, 50... Spring, 51... Lower spring seat, 52... Upper spring seat, 60... Lower side link of spring, 61... Vehicle side link, 80... Vehicle, 90... Lower side member of spring, 91... Vehicle side member.

Claims

1. An electromagnetic suspension that uses a linear motor, the linear motor having an armature composed of a winding and a magnetic body; and a permanent magnet portion disposed on the outer peripheral side of the armature and composed of a permanent magnet and a cylindrical magnetic body, the armature being linearly driven relative to the permanent magnet portion. The electromagnetic suspension is characterized in that a concave portion that is recessed compared to the outer peripheral portion and a convex portion that is protruded compared to the outer peripheral portion are arranged on the same circumference of the outer peripheral portion of the cylindrical magnetic body.

2. The electromagnetic suspension according to claim 1, characterized in that the convex portion is divided into a plurality of parts.

3. The electromagnetic suspension according to claim 1, characterized in that the cross-sectional area of the convex portion is equal to or greater than the cross-sectional area of the concave portion.

4. The electromagnetic suspension according to claim 1, characterized in that the convex portion is formed as a different entity from the cylindrical magnetic body.

5. The electromagnetic suspension according to claim 1, characterized in that the convex portion has a chamfered portion formed by chamfering its corner portions.

6. The electromagnetic suspension according to claim 1, characterized in that the magnetic permeability of the material of the convex portion is higher than that of the material of the cylindrical magnetic body.

7. The electromagnetic suspension according to claim 1, characterized in that a cylindrical portion end cover is arranged at one end of the linear motor, a spring lower side connecting rod is coupled to the cylindrical portion end cover, and a vehicle side connecting rod is arranged on the other side of the linear motor.

8. The electromagnetic suspension according to claim 7, characterized in that a lower spring seat is arranged on the outer peripheral side of the linear motor and in the middle portion of the linear motor, an upper spring seat is arranged on the vehicle side connecting rod side, and a spring is arranged on the outer peripheral side of the linear motor in such a manner as to be sandwiched between the upper spring seat and the lower spring seat.

9. The electromagnetic suspension according to claim 1, characterized in that the convex portion rotates relative to the cylindrical magnetic body.

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