JP5876764B2 - Electromagnetic suspension - Google Patents

Description

  The present invention relates to an electromagnetic suspension suitably used for buffering vibrations of vehicles such as automobiles and railway vehicles.

  Generally, in a vehicle such as an automobile, a shock absorber is provided between a vehicle body side (on a spring) and each axle side (under a spring). As such a shock absorber, an electromagnetic suspension using a linear motor composed of a stator and a mover supported so as to be capable of relative linear motion is known.

  In this type of electromagnetic suspension according to the prior art, for example, a plurality of cylindrical permanent magnets are arranged in the axial direction on the mover.

  Here, in patent document 1, in order to prevent that the permanent magnet provided in the needle | mover and the armature provided in the stator contact directly, from a thin pipe long in the axial direction, The structure which covers the whole permanent magnet arranged in the axial direction with the protective cover which becomes is disclosed.

  On the other hand, Patent Document 2 discloses a configuration in which a concave portion for assembling (attaching) a permanent magnet to a stator is formed and positioning of the permanent magnet is performed by the concave portion with respect to the linear motor.

JP 2007-174804 A JP 2001-95225 A

  By the way, in the prior art by patent document 1, the protective cover which protects a permanent magnet is comprised by one thin pipe long in the axial direction, and there exists a problem that the said protective cover becomes expensive. On the other hand, in order to reduce the cost of the protective cover, it is conceivable to roll a thin plate to form a single protective cover that is long in the axial direction. In this case, the roundness of the protective cover (assembly accuracy) There is a problem that it is troublesome to secure.

  On the other hand, the prior art according to Patent Document 2 may increase the processing cost by forming the recess. Further, depending on the shape of the recess, there is a risk that the processing operation becomes excessively troublesome.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide an electromagnetic suspension capable of achieving both protection of a permanent magnet and improvement in assembly of the permanent magnet. .

  In order to solve the above-described problem, the present invention uses one member of a first member and a second member supported so as to be capable of relative linear motion as a stator, and includes the first member and the second member. The present invention is applied to an electromagnetic suspension using a linear motor having the other member as a mover.

A feature of the configuration employed by the present invention is that the first member includes an armature, and the second member has a plurality of cylindrical shapes arranged side by side in the axial direction of the second member. The second member is provided with a cylindrical magnet protective cover that covers the peripheral surface of the inner peripheral side and the outer peripheral side of each permanent magnet that faces the armature. provided for each magnet, the axial end portion of one side of the magnet protection cover is to have a structure in which Ru is provided over the protruding portion that protrudes in the thickness direction of the permanent magnet in the circumferential direction.
The first member includes an armature, and the second member includes a plurality of cylindrical permanent magnets arranged side by side in the axial direction of the second member. The two members are provided with a cylindrical magnet protection cover for each of the permanent magnets, which covers the peripheral surface of the permanent magnet on the side facing the armature, of the inner circumference side and the outer circumference side. In the end portions on both sides in the axial direction, protrusions protruding in the thickness direction of the permanent magnet are provided in the circumferential direction.

  According to the present invention, it is possible to achieve both protection of the permanent magnet and improvement of assembly of the permanent magnet.

1 is a longitudinal sectional view showing an electromagnetic suspension according to a first embodiment. FIG. 2 is an enlarged cross-sectional view corresponding to a (II) portion in FIG. 1 showing a yoke, a permanent magnet, and a magnet protective cover with the stator omitted. It is an expanded sectional view which shows the magnet protective cover in FIG. 2 alone. It is a disassembled perspective view which shows the state which attaches a permanent magnet to a magnet protection cover. It is a longitudinal cross-sectional view which shows the state which assembled | attached to a yoke the assembly by which the permanent magnet was attached to the magnet protection cover. It is an expanded sectional view similar to FIG. 2 which shows the yoke, permanent magnet, and magnet protective cover by 2nd Embodiment. It is an expanded sectional view which shows the magnet protection cover in FIG. 6 alone. It is sectional drawing seen from the arrow VIII-VIII direction in FIG. 6 which shows a yoke, a permanent magnet, and a magnet protective cover. It is a disassembled perspective view which shows the state which attaches a permanent magnet to a magnet protection cover. It is a perspective view which shows the magnet protective cover by 3rd Embodiment alone. It is an expanded sectional view of the same position as Drawing 7 showing the magnet protection cover by a 4th embodiment alone. It is sectional drawing seen from the arrow XII-XII direction in FIG. 11 which shows a magnet protective cover. It is a perspective view which shows the magnet protection cover by 5th Embodiment alone. It is an expanded sectional view similar to FIG. 2 which shows the yoke, permanent magnet, and magnet protective cover by 6th Embodiment. It is an expanded sectional view which shows the magnet protective cover in FIG. 14 alone. It is a perspective view which shows the magnet protection cover in FIG. 14 alone. It is a perspective view which shows the magnet protective cover, permanent magnet, etc. by 7th Embodiment. It is a longitudinal cross-sectional view which shows the electromagnetic suspension by 8th Embodiment. FIG. 19 is an enlarged cross-sectional view corresponding to the (XIX) portion in FIG. 18 illustrating a yoke, a permanent magnet, and a magnet protective cover with the stator omitted.

  Hereinafter, an electromagnetic suspension according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 5 show a first embodiment of the present invention. In the figure, an electromagnetic suspension 1 is a shock absorber (linear actuator) using a linear motor, and is roughly constituted by a stator 2 and a mover 10. The stator 2 (the armature 6) and the mover 10 (the permanent magnets 17A and 17B) constitute a linear motor.

  Here, the stator 2 and the mover 10 are a first member and a second member that are supported so as to be capable of relative linear motion, and in the case of the present embodiment, the first member and the second member The case where the first member is the stator 2 and the second member is the mover 10 is illustrated. However, the present invention is not limited to this, and the first member may be a mover and the second member may be a stator.

  The stator 2 corresponding to the first member in the present embodiment is roughly constituted by a rod 3 and an armature 6. Here, the rod 3 is formed, for example, in a cylindrical shape, and extends in the axial direction (left and right in FIG. 1) as a stroke direction, and one end side (left end side in FIG. 1) has a lid 13 described later. Protruding from. On one end side (protruding end side) of the rod 3, for example, a screw portion 3A attached to a sprung member (for example, a vehicle body) of a vehicle is provided. On the other hand, an armature 6 is provided on the other end side (the right end side in FIG. 1) of the rod 3. And the 1st bearing 3C with which the outer peripheral surface of the below-mentioned guide rod 12 slidably contacts is provided in the inner peripheral surface 3B of the other end side of the rod 3. As shown in FIG.

  A first stopper 4 as a stopper member that comes into contact with a lid body 13 attached to the yoke 11 when the yoke 11 described later is fully extended, on one end side of an armature 6 described later on the outer peripheral surface 3D of the rod 3; A second stopper 5 is provided. Here, the 1st stopper 4 is formed in the cylindrical shape, for example with the metal material, and is attached to the rod 3 using the screw | thread etc. (not shown). On the other hand, the second stopper 5 is formed in a cylindrical shape by an elastic material such as polyamide resin, urethane resin, or rubber, and is attached to one end side of the first stopper 4. The second stopper 5 reduces the impact when it comes into contact with the lid 13.

  The armature 6 fixed to the other end of the rod 3 is wound in a predetermined direction with, for example, a dust core, a laminated electromagnetic steel sheet, a substantially cylindrical core 7 formed by cutting or the like from a magnetic piece, and the like. The plurality of coils 8 are accommodated in the core 7.

  Each coil 8 is disposed to face an inner peripheral surface of a mover 10 (permanent magnets 17A and 17B) described later. For example, as shown in FIG. 1, each coil 8 is located on the outer peripheral surface side of the substantially cylindrical core 7 and is disposed in the circumferential direction of the core 7, and the axial direction of the substantially cylindrical core 7 is It is spaced apart in the axial direction at six positions. A cable 9 is connected to each coil 8, and each coil 8 is energized via the cable 9.

  Note that the number of coils 8 is not limited to that shown in the figure, and can be set as appropriate according to design specifications, such as three, nine, and twelve. Also, the wiring method between the coils 8 can be set as appropriate according to the design specifications and the like. Furthermore, the shape of the core 7 is not limited to that shown in the figure, and for example, a configuration for providing a coil protecting convex portion, a thrust pulsation reducing curved portion, or the like may be provided.

  The mover 10 corresponding to the second member in the present embodiment is assembled to the stator 2 so as to be capable of displacement in the axial direction that is the stroke direction. Here, the mover 10 is roughly constituted by a yoke 11, a lid body 13, and a plurality of permanent magnets 17A and 17B.

  The yoke 11 is formed in a bottomed cylindrical shape using, for example, a magnetic material, and extends in the axial direction as the stroke direction, and is a cylindrical portion 11A provided with a lid 13 described later on one end side (left end side in FIG. 1). And a bottom portion 11B that closes the other end side (right end side in FIG. 1) of the cylindrical portion 11A. A bracket 11C that is attached to, for example, an unsprung member (for example, an axle) of a vehicle is provided on the bottom 11B. The yoke 11 is made of a magnetic material to form a magnetic circuit of the electromagnetic suspension 1 and also serves as a cover for preventing leakage of magnetic flux of permanent magnets 17A and 17B described later.

  In addition, a guide rod 12 is provided on the inner peripheral side of the yoke 11 so that the proximal end side is fixed to the bottom portion 11B and the distal end side extends in the axial direction that is the stroke direction. A first bearing 3 </ b> C provided on the rod 3 slides on the outer peripheral surface of the guide rod 12. The guide rod 12 adopts a configuration in which the guide rod 12 is formed integrally with the yoke 11 at the bottom 11B of the yoke 11 or a configuration in which a guide rod 12 separate from the yoke 11 is fixed to the bottom 11B using screws, bolts, or the like. can do.

  A lid 13 is fixed to one end of the cylindrical portion 11 </ b> A of the yoke 11 using bolts and nuts 14. The lid body 13 is formed in a bottomed cylindrical shape, and has a cylindrical portion 13A having the same outer diameter as the cylindrical portion 11A of the yoke 11, a bottom portion 13B that closes one end side of the cylindrical portion 13A, and penetrates the bottom portion 13B. And a rod insertion hole 13C provided.

  A second bearing 15 with which the outer peripheral surface 3D of the rod 3 is in sliding contact is provided on the inner peripheral side of the rod insertion hole 13C. In addition, a seal 16 that prevents water and dust from entering from the outside is provided on the inner peripheral side of the rod insertion hole 13 </ b> C and on one end side of the second bearing 15.

  Here, the yoke 11 is preferably a magnetic material from the viewpoint of a magnetic circuit or magnetic leakage, but at least one of the second bearing 15 and the lid 13 is preferably a non-magnetic material. The reason for this is as follows. That is, the magnetic flux emitted from permanent magnets 17A and 17B, which will be described later, on the side facing the armature 6 (inner peripheral surface side), the inner peripheral surface 17B1 passes through the core 7 of the armature 6 from the N-pole permanent magnet 17B. The inner circumferential surface 17A1 becomes a path (magnetic path) toward the S-pole permanent magnet 17A, and on the side (outer circumferential surface side) that does not face the armature 6, the outer circumferential surface 17A2 extends from the N-pole permanent magnet 17A to the cylindrical portion of the yoke 11. The outer peripheral surface 17B2 becomes a path (magnetic path) toward the S-pole permanent magnet 17B through 11A. Here, when both the second bearing 15 and the lid 13 are made of a magnetic material, the magnetic flux emitted from the outer peripheral surface 17A2 of the permanent magnet 17A on the most end side (left end side) of the yoke 11 is the outer periphery of the permanent magnet 17A. A path (magnetic path) returns from the surface 17A2 to the inner peripheral surface 17A1 of the permanent magnet 17A through the yoke 11, the lid 13, the second bearing 15, the rod 3, and the core 7 of the armature 6.

  In this case, when the electromagnetic suspension 1 is used, iron powder and sand iron from the road surface may adhere to the magnetic lid body 13, the second bearing 15, and the rod 3. The iron powder and sand iron adhering in this way cannot be easily peeled off and may be caught in the sliding portion between the second bearing 15 and the rod 3. Therefore, by making at least one of the second bearing 15 and the lid 13 nonmagnetic, if the magnetic circuit is cut off, it becomes possible to easily peel off even if iron powder or iron sand adheres, The second bearing 15 and the rod 3 can be slid stably.

  A plurality of permanent magnets 17A and 17B formed in a cylindrical shape are arranged side by side along the axial direction on the inner peripheral surface side of the cylindrical portion 11A of the yoke 11. In this case, the permanent magnets 17A and 17B adjacent in the axial direction have, for example, opposite polarities. For example, the permanent magnet 17A has an S-pole on the inner peripheral surface 17A1 side and an N-pole on the outer peripheral surface 17A2 side. On the other hand, the permanent magnet 17B has an N pole on the inner peripheral surface 17B1 side and an S pole on the outer peripheral surface 17B2 side.

  Here, as shown in FIG. 4, the inner diameter dimensions of the permanent magnets 17A and 17B are substantially the same as the outer diameter dimension of the magnet mounting portion 19 of the magnet protection cover 18 described later, and the permanent magnets 17A and 17B are magnetized. It is configured so that it can be fitted (fitted) to the magnet mounting portion 19 of the protective cover 18.

  As the permanent magnets 17A and 17B, a ring magnet integrally formed in a cylindrical shape or a segment magnet divided in the circumferential direction can be adopted. In the case of the present embodiment, a case where a ring magnet integrally formed in a cylindrical shape is employed will be described as an example. Further, in the second, third, fourth, fifth and seventh embodiments described later, a case where a segment magnet divided into eight in the circumferential direction is employed will be described as an example. However, any embodiment is not limited to the magnet of the type mentioned in the example. That is, whether to use a ring magnet or a segment magnet, how many segment magnets to use, etc. can be selected in consideration of the assembling property of the permanent magnet to the yoke 11 and the cost. it can. The magnetizing direction of the permanent magnet may be either the radial direction or the axial direction of the magnet protective cover 18 and can be selected depending on manufacturability, usage, and the like. The sizes of the permanent magnets 17A and 17B are the same, and the dimensions and thickness are determined in consideration of the combination of the armature 6 with the coil 8 and the degree of magnetic leakage to the outside.

  By the way, in Patent Document 1, in order to prevent the permanent magnets from coming into direct contact with the armature, the entire permanent magnets arranged in the axial direction are covered with a protective cover composed of one thin pipe that is long in the axial direction. Is disclosed. In this case, since the protective cover is long in the axial direction, the protective cover may be expensive. On the other hand, in order to reduce the cost of the protective cover, it is conceivable to form a protective cover that is long in the axial direction by rolling the thin plate. In this case, a jig for ensuring the roundness of the protective cover is required, which may increase the number of assembling steps or make it difficult to ensure the assembling accuracy. In addition, when sufficient roundness cannot be ensured, the protective cover and the armature come into contact with each other, which may increase resistance due to friction, or generate abnormal noise or vibration.

  Therefore, in the present embodiment, the magnet protective cover 18 is individually provided for each of the permanent magnets 17A and 17B. That is, the yoke 11 of the mover 10 is provided with a plurality of magnet protection covers 18 that are positioned on the inner peripheral side of the permanent magnets 17A and 17B and individually protect the permanent magnets 17A and 17B. Each magnet protection cover 18 individually covers the inner peripheral surface 17A1 of the permanent magnet 17A and the inner peripheral surface 17B1 of the permanent magnet 17B, that is, the peripheral surface on the side facing the armature 6. Each magnet protection cover 18 prevents the permanent magnets 17A and 17B and the armature 6 from coming into direct contact with each other, and the axial gap (gap) between the permanent magnets 17A and 17B adjacent in the axial direction. Is to secure.

  Here, the magnet protection cover 18 is formed in a cylindrical shape using a non-magnetic material such as an aluminum alloy, stainless steel, or synthetic resin, or a magnetic material such as an iron-based alloy. In this case, the magnet protection cover 18 is preferably formed of a material having a sufficient strength (high strength material) so that the permanent magnets 17A and 17B can be protected from contact with the armature 6, for example. The magnet protective cover 18 can be selected from a magnetic body and a non-magnetic body depending on the design of the linear motor. For example, in the case of an embedded magnet type linear motor, the magnet protection cover 18 can be a magnetic body, and in the case of a surface magnet type linear motor, the magnet protection cover 18 can be a non-magnetic body.

  The magnet protection cover 18 can be formed by, for example, pressing or drawing when a metal material is used, and can be formed by, for example, injection molding when using a synthetic resin. As a result, mass production is possible at a low cost, and the cost of the magnet protective cover 18 and thus the electromagnetic suspension 1 can be reduced.

  The magnet protective cover 18 is positioned on one end side (the left end side in FIGS. 1 to 5) of the cylindrical magnet attachment portion 19 to which the permanent magnets 17A and 17B are attached, and the magnet attachment portion 19. It is comprised by the projection part 20 which protrudes on the radial direction outer side rather than the outer peripheral surface. As a result, the magnet protective cover 18 has a protrusion 20 protruding in the thickness direction of the permanent magnets 17A and 17B at the end on one side in the axial direction (left side in FIGS. 1 to 5) over the entire circumference. It is set as the structure provided. Further, as shown in FIG. 4, the end 19 </ b> A on the other side in the axial direction of the magnet mounting portion 19 (the right side in FIGS. 1 to 5) replaces the permanent magnets 17 </ b> A and 17 </ b> B integrally formed in a cylindrical shape with the magnet protective cover 18. It is an insertion part when attached to.

  Here, as shown in FIG. 2, the outer peripheral surface 20A of the protruding portion 20 is formed in the cylindrical portion 11A with the permanent magnets 17A and 17B and the magnet protective cover 18 mounted in the cylindrical portion 11A of the yoke 11. It abuts on the circumferential surface over the entire circumference. By this contact, the radial positioning of the magnet protection cover 18 in the yoke 11 is achieved. Further, the permanent magnets 17A and 17B adjacent in the axial direction are opposed to each other with an interval corresponding to the axial thickness of the protrusion 20. Thereby, a required space | interval (gap) can be ensured between the permanent magnets 17A and 17B adjacent in the axial direction.

  In addition, individual differences in the dimensions of the permanent magnets 17A and 17B, for example, variations in the dimensions of the permanent magnets 17A and 17B due to manufacturing errors and the like are caused by the outer peripheral surface of the magnet mounting portion 19 of the magnet protective cover 18 and the inner periphery of the yoke 11. It can be absorbed in a cylindrical magnet mounting space S (see FIG. 3) formed by the surface and the side surface of the protrusion 20. As a result, as shown in FIGS. 2 and 3, the accuracy of the inner diameter dimension D1 of the mover 10 as a whole is the same as the accuracy of the inner diameter dimension D2 of the cylindrical portion 11A of the yoke 11 and the outer diameter dimension (projection portion) of the magnet protective cover 18. The outer diameter of the outer peripheral surface 20) can be determined according to the accuracy of D3 and the accuracy of the inner diameter D4 of the magnet protective cover 18. Therefore, by assuring the processing accuracy of the yoke 11 and the magnet protective cover 18, the assembly accuracy of the entire movable element 10 can be ensured.

  The electromagnetic suspension 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  For example, when the electromagnetic suspension 1 is interposed vertically between the unsprung member and the sprung member of the vehicle in a vertically placed state, when the vehicle vibrates upward and downward, the electromagnetic suspension 1 Force acts in the stroke direction (axial direction). In accordance with this force, the stator 2 and the mover 10 move relative to each other. At this time, the damping force of the electromagnetic suspension 1 can be adjusted by applying a predetermined current to the coil 8 in accordance with the magnetic pole positions of the permanent magnets 17A and 17B, thereby improving the riding comfort and steering stability of the vehicle. Can be improved.

  Here, a force acts on the electromagnetic suspension 1 in a direction other than the stroke direction according to the road surface state and the traveling state. For example, a lateral force other than a force in the stroke direction acts on the electromagnetic suspension 1 when overcoming a protrusion on the road surface or when the vehicle bends.

  As described above, when a lateral force is applied to the electromagnetic suspension 1, the armature 6 of the stator 2 and the mover 10 may come into contact with each other. When the armature 6 and the mover 10 are in contact with each other, the contact sound may cause discomfort to the occupant. Moreover, if this contact state continues, the permanent magnets 17A and 17B of the mover 10 may be worn and the magnet performance may be deteriorated, and the coil 8 of the armature 6 may be worn and it may be difficult to ensure durability. There is.

  On the other hand, the electromagnetic suspension 1 mounted on the vehicle suppresses vibration by switching to control with low power consumption or a damping force due to the counter electromotive force of the linear motor when the remaining amount of driving power source such as a battery is reduced. Control may be performed. In this case, if the magnet performance is reduced, the desired performance of the electromagnetic suspension 1 may not be sufficiently exhibited.

  On the other hand, in this Embodiment, it is set as the structure which provides the magnet protection cover 18 which protects several permanent magnet 17A, 17B separately. For this reason, the permanent magnets 17A and 17B can be stably protected from the armature 6, the durability of the permanent magnets 17A and 17B can be secured, and the deterioration of the magnet performance can be suppressed. Thereby, the reliability and stability of the electromagnetic suspension 1 can be improved.

  Next, the operation of assembling the permanent magnets 17A and 17B and the magnet protection cover 18 to the yoke 11 will be described. Although the peripheral surfaces of the permanent magnets 17A and 17B are configured to be different from each other, the shapes thereof are the same. Therefore, the permanent magnet 17A will be mainly described below as an example.

  First, a cylindrical and long assembly made of a magnetic material (not shown) having an outer diameter dimension substantially the same as the inner diameter dimension of the magnet protection cover 18 is inserted inside the magnet protection cover 18, for example. A magnet protective cover 18 is fitted to the end of the accessory. The assembly tool is formed of, for example, a magnetic material such as a ferrous metal pipe to which the permanent magnets 17A and 17B are attracted, and an assembly (assembly) A1 in which the permanent magnet 17A is attached to the magnet protective cover 18 and This is an assembly tool having a function for inserting the assemblies A1 and A2 into the yoke 11 when the assembly (assembly) A2 having the permanent magnet 17B attached to the magnet protective cover 18 is assembled into the yoke 11. . For this reason, it is preferable that the length dimension (axial dimension) of the assembly tool is larger than the length dimension (axial dimension) of the cylindrical portion 11A of the yoke 11, for example.

  When the permanent magnet is a ring magnet, the assembly tool can be inserted into the magnet protection cover 18 before the permanent magnets 17A and 17B are attached to the magnet protection cover 18, or can be permanently attached to the magnet protection cover 18. The magnets 17A and 17B can be attached and then inserted into the magnet protective cover 18. On the other hand, the permanent magnet is a segment magnet, that is, a permanent magnet is constituted by a magnet divided body as in the second, third, fourth, fifth and seventh embodiments described later, for example, a magnet divided body 24A according to the second embodiment. In this case, the assembly tool is preferably inserted into the magnet protection cover 18 before attaching the magnet divided body 24 </ b> A to the magnet protection cover 18. The reason for this is that when the magnet divided body 24A is attached to the magnet protective cover 18, the magnet divided body 24A has an attractive force acting toward the assembly tool, and the magnetic divided body 24A is held by the magnet protective cover 18 by this attractive force. Because it can.

  If the magnet protective cover 18 is fitted to the end of such a magnetic body assembly tool, an adhesive is applied to the outer peripheral surface of the magnet mounting portion 19 of the magnet protective cover 18 prior to mounting the permanent magnet 17A. . In order to prevent thermal demagnetization of the permanent magnet 17A, an adhesive that cures at room temperature (normal temperature) or below the irreversible demagnetization temperature of the permanent magnet 17A is used as this adhesive. Furthermore, this adhesive shall ensure adhesive force within the range of the operating temperature of the electromagnetic suspension 1, for example.

  When the adhesive is applied to the outer peripheral surface of the magnet mounting portion 19, the end 19A side on the other axial side of the magnet mounting portion 19 is inserted into the permanent magnet 17A as shown in FIG. This insertion is performed until the end of the permanent magnet 17 </ b> A comes into contact with the protrusion 20 of the magnet protection cover 18.

  As described above, the assembly A1 having the permanent magnets 17A attached to the magnet protection cover 18 is produced by the number of poles necessary for the electromagnetic suspension 1, for example, six sets of assemblies A1 in this embodiment. Similarly, five sets of assemblies A2 in which the permanent magnets 17B are attached to the magnet protective cover 18 are manufactured. At this time, in order to prevent erroneous assembly of the permanent magnets 17A and 17B, it is preferable that the permanent magnets 17A and 17B are color-coded, or the magnet protective cover 18 is marked with a mark such as a marking. Further, five sets of assemblies A1 to which the permanent magnets 17A are attached and six sets of assemblies A2 to which the permanent magnets 17B are attached may be manufactured. In short, the assemblies A1 and A2 for the necessary number of poles are manufactured according to the specifications (number of poles) of the electromagnetic suspension 1.

  Next, as shown in FIG. 5, the assembly A <b> 1 in which the permanent magnet 17 </ b> A is attached to the magnet protection cover 18 is inserted into the cylindrical portion 11 </ b> A of the yoke 11. At this time, the assembly A1 is inserted into the cylindrical portion 11A of the yoke 11 using an assembly tool, and the assembly A1 is guided to a predetermined position in the cylindrical portion 11A. Then, by pulling out the assembly tool from the assembly A1, the outer peripheral surface 17A2 of the permanent magnet 17A is magnetically attracted to the yoke 11. Prior to the insertion of the assembly A1, an adhesive is applied to the inner peripheral surface of the yoke 11 or the outer peripheral surface 17A2 of the permanent magnet 17A. Thereby, while being able to ensure the adhesive force of the inner peripheral surface of the yoke 11 and outer peripheral surface 17A2 of the permanent magnet 17A, an air layer can be eliminated between both, and a heat transfer rate can be improved.

  If the assembly A1 of the permanent magnet 17A is attached to a predetermined position of the yoke 11, the assembly A2 of the permanent magnet 17B having the opposite polarity to the permanent magnet 17A is abutted against the assembly A1 previously assembled by the same procedure. It attaches to the cylinder part 11A of the yoke 11. That is, the assemblies A1 of the permanent magnets 17A and the assemblies A2 of the permanent magnets 17B are alternately attached to the yoke 11 by the number of poles necessary for the electromagnetic suspension 1.

  When all the assemblies A1 and A2 are mounted in the yoke 11, the stator 2 with the armature 6 mounted on the rod 3 is inserted into the yoke 11, and the lid 13 is assembled to one end of the yoke 11. Thus, the electromagnetic suspension 1 shown in FIG. 1 can be assembled. In this state, adjacent permanent magnets 17 </ b> A and 17 </ b> B in the yoke 11 face each other with an interval corresponding to the axial thickness of the protrusion 20. Therefore, by defining the thickness dimension in the axial direction of the protruding portion 20, a necessary interval (gap) can be secured between the permanent magnets 17A and 17B adjacent in the axial direction.

  Thus, according to the first embodiment, it is possible to achieve both protection of the permanent magnets 17A and 17B and improvement in assembly of the permanent magnets 17A and 17B.

  That is, since the magnet protective cover 18 is provided separately for each of the permanent magnets 17A and 17B, the permanent magnets 17A and 17B can be stably protected by the respective magnet protective covers 18. In this case, the cost can be reduced, and the processing accuracy and the assembly accuracy can be improved as compared with the conventional protective cover that is long in the axial direction. Further, when the permanent magnets 17A and 17B and the magnet protection cover 18 are assembled to the mover 10, the movers are integrally formed as assemblies (assemblies) A1 and A2 in which the permanent magnets 17A and 17B are attached to the magnet protection cover 18. 10, and the assembly work to the mover 10 can be facilitated and simplified.

  Furthermore, according to the first embodiment, since the projection 20 is provided at the end of the magnet protection cover 18 on the one axial side, the permanent magnets 17A and 17B adjacent in the axial direction are replaced with the projection 20 Can be arranged to face each other with an interval corresponding to the thickness in the axial direction. Accordingly, one magnet protective cover is used to ensure an axial interval (gap) between the adjacent permanent magnets 17A and 17B and to protect the permanent magnets 17A and 17B from contact with the armature 6. 18 can be performed. That is, the number of parts can be reduced as compared with the case where the spacer and the magnet protective cover for securing the axial interval between the permanent magnets 17A and 17B are separately provided.

  Next, FIGS. 6 to 9 show a second embodiment of the present invention. A feature of the present embodiment is that a protrusion is provided at both ends of the magnet protective cover in the axial direction. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The magnet protective cover 21 according to the second embodiment includes a cylindrical magnet mounting portion 22 to which permanent magnets 24 and 25, which will be described later, are mounted, and both end sides of the magnet mounting portion 22 (the left side of FIGS. It is comprised by a pair of projection part 23 which is located in the right direction both ends) and protrudes in a radial direction outer side from the outer peripheral surface of this magnet attaching part 22. FIG. Thereby, the magnet protection cover 21 has a configuration in which protrusions 23 projecting in the thickness direction of the permanent magnets 24 and 25 are provided over the entire circumference in the circumferential direction at both ends in the axial direction.

  Here, in the present embodiment, since the projections 23 are provided at both ends of the magnet protective cover 21, the permanent magnets 17A and 17B of the first embodiment described above, that is, a cylindrical shape are integrated. It is difficult to adopt the ring magnet formed in This is because it becomes difficult to attach the magnet protection cover 21 to the ring magnet by insertion. Therefore, in the present embodiment, segment magnets divided in the circumferential direction are employed as the permanent magnets 24 and 25. More specifically, each permanent magnet 24, 25 is divided into eight in the circumferential direction, and is configured by arranging eight magnet divided bodies 24A, 25A side by side in the circumferential direction.

  In each magnet divided body 24 </ b> A of the permanent magnet 24, for example, the inner surface 24 </ b> A <b> 1 that is a part of the inner peripheral surface of the permanent magnet 24 is an S pole, and the outer surface 24 </ b> A <b> 2 that is a part of the outer peripheral surface of the permanent magnet 24 is an N pole. It is configured. On the other hand, each magnet divided body 25 </ b> A of the permanent magnet 25 that is adjacent to the permanent magnet 24 in the axial direction has, for example, an inner surface 25 </ b> A <b> 1 that is a part of the inner peripheral surface of the permanent magnet 25, and an outer peripheral surface of the permanent magnet 25. A part of the outer surface 25A2 is configured as an S pole. Although the peripheral surfaces of the permanent magnets 24 and 25 are configured to be different from each other, the shapes thereof are the same. Therefore, the permanent magnet 24 will be mainly described below as an example.

  For example, as shown in FIG. 9, a magnet divided body 24 </ b> A is attached to the magnet attachment portion 22 of the magnet protection cover 21 from the outside in the radial direction of the magnet attachment portion 22. In this case, an assembly tool (not shown) made of a magnetic material is inserted in advance on the inner peripheral side of the magnet protection cover 21. Thereby, when attaching the magnet division body 24A to the magnet attachment part 22 of the magnet protection cover 21, an attractive force acts between the assembly tool and the magnet division body 24A, and the magnet division body 24A is held by the magnet attachment part 22. can do.

  Since the radius of curvature of the inner side surface 24A1 of each magnet divided body 24A is substantially the same as the radius of the outer peripheral surface of the magnet mounting portion 22, the inner side surface 24A1 of each magnet divided body 24A is the outer periphery of the magnet mounting portion 22. It can be brought into contact with the surface without any gap. Moreover, since the axial direction dimension of each magnet division body 24A is a dimension substantially the same as the axial direction dimension of the magnet attachment part 22, it makes each magnet division body 24A contact | abut between each projection part 23 without a gap. Can do. Thereby, each magnet division body 24A can be easily positioned in the axial direction.

  A total of eight magnet divisions 24A are sequentially attached to the magnet attachment portion 22 of the magnet protection cover 21 over the entire circumference. In this case, a repulsive force due to the same polarity acts between the already installed magnet segment 24A and the magnet segment 24A to be installed (for example, the last magnet segment 24A), and the magnet segment to be installed from now on. There is a possibility that the mounting operation of 24A may be troublesome. Therefore, in such a case, prior to the attachment of the magnet divided body 24A to be attached in the future, for example, a portion made of a non-magnetic material having the same shape and the same size as the magnet divided body 24A is attached to a part where the magnet divided body 24A is attached in advance. By attaching the replacement spacer in advance and attaching the magnet divided body 24A so as to replace the replacement spacer, the mounting work can be facilitated.

  An assembly in which all eight magnet divisions 24A are attached to the magnet protection cover 21, that is, an assembly of the magnet protection cover 21 and the permanent magnet 24, is produced for the necessary number of poles. Similarly, the assembly of the magnet protective cover 21 and the permanent magnet 25 is manufactured for the necessary number of poles. And each assembly is inserted in order into the cylinder part 11A of the yoke 11 from the back | inner side using an assembly tool similarly to the above-mentioned 1st Embodiment. In this case, the assembly is mounted in the yoke 11 so that the permanent magnets 24 and 25 adjacent in the axial direction have opposite polarities. At this time, as shown in FIG. 6, the outer peripheral surfaces 23 </ b> A of the pair of protrusions 23 of the magnet protection cover 21 are in contact with the inner peripheral surfaces of the cylindrical portion 11 </ b> A of the yoke 11.

  The width dimension (axial dimension) of each projection 23 provided on both axial sides of the magnet protection cover 21 is the same so that the insertion direction of the yoke 11 into the cylindrical portion 11A is not restricted. It is preferable. For example, in the case where the width dimension is different between the one projection 23 in the axial direction and the other projection 23 in the axial direction, if the insertion direction is wrong, the pitch of the permanent magnets 24 and 25 (the interval between the adjacent permanent magnets 24 and 25). ) May change (pitch shift), leading to an increase in thrust pulsation and a decrease in performance. However, when the insertion direction of the magnet protection cover 21 is strictly managed, or when the manufacturing cost can be reduced by making the width dimension of each projection 23 different, a configuration in which the width dimension of the projection 23 is different is adopted. You can also.

  Thus, also in the second embodiment configured in this way, the same operational effects as those of the first embodiment described above can be obtained.

  In particular, in the case of the present embodiment, the projections 23 are provided at both ends in the axial direction of the magnet protection cover 21, so that the outer peripheral surface 23 </ b> A of the two projections 23 is the cylindrical portion of the yoke 11. It can be brought into contact with the inner peripheral surface of 11A. In this case, the axial center of the cylindrical portion 11A of the yoke 11 and the axial center of the magnet protection cover 21 are secured by ensuring the dimensional accuracy between the outer peripheral surface 23A of the protruding portion 23 and the inner peripheral surface of the cylindrical portion 11A of the yoke 11. It can be easily matched (coaxiality can be easily secured), and assembly accuracy can be improved.

  Moreover, since each magnet protection cover 21 adjacent to the axial direction is in contact with the projections 23 on both ends in the axial direction of the magnet protection cover 21, the adjacent magnet protection covers are compared with the first embodiment described above. The contact area of the cover 21 can be increased. Thereby, even if the axial load applied between the adjacent magnet protective covers 21 is large, the stress can be reduced by the large contact area, and the axial deformation of the magnet protective cover 21 can be reduced. Thereby, the stability and reliability of the electromagnetic suspension 1 can be further improved.

  Next, FIG. 10 shows a third embodiment of the present invention. The feature of this embodiment is that a notch is provided on the peripheral surface of the protrusion of the magnet protective cover. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The magnet protection cover 31 according to the third embodiment includes a magnet attachment portion 32 and a pair of protrusions 33, as with the magnet protection cover 21 according to the second embodiment. Thereby, the magnet protection cover 31 is provided with protrusions 33 protruding in the thickness direction of the permanent magnets 24 and 25 (see FIGS. 6, 8, and 9) at both ends in the axial direction over the entire circumference. It is configured.

  Here, in the case of the present embodiment, a notch 34 is provided on the outer peripheral surface 33 </ b> A of each protrusion 33. The notches 34 are recessed from the outer peripheral surface 33A of the protrusion 33 inward in the radial direction of the magnet protection cover. For example, in the present embodiment, eight notches 34 are provided at equal intervals in the circumferential direction of the protrusion 33. It has been.

  Here, when the magnet protective covers 31 adjacent to each other in the axial direction in the cylindrical portion 11A of the yoke 11 are joined using an adhesive, the thickness of the adhesive between the magnet protective covers 31 (adhesive layer) ), The axial dimension of the entire magnet protective cover 31 aligned in the axial direction becomes longer. For this reason, the axial dimensions of the magnet protective cover 31 and the yoke 11 are designed in consideration of the thickness of the adhesive. However, if the amount of the applied adhesive becomes larger than necessary, the axial dimension of the entire magnet protective cover 31 arranged in the axial direction may be longer than the maximum allowable dimension.

  Therefore, in the present embodiment, by providing the notch 34 on the outer peripheral surface 33A of the protrusion 33, the excess adhesive between the magnet protective covers 31 adjacent in the axial direction is removed from the notch 34 of the protrusion 33. It is configured to be able to escape. Thereby, the thickness dimension of an adhesive agent can be reliably stored within a design value (tolerance), and assembly accuracy (dimensional accuracy) in the axial direction can be ensured.

  In the case of the present embodiment, the notch 34 of the projection 33 on the one axial side of the magnet protective cover 31 and the notch 34 of the projection 33 on the other axial side are opposed to each other in the axial direction. Has been placed. For this reason, when attaching the magnet divided bodies 24A and 25A to the magnet attaching portion 32 of the magnet protective cover 31, a rod-like positioning member (key) (not shown) is bridged between the notches 34 corresponding to the axial direction, and the positioning is performed. The attachment position of the circumferential direction of magnet division body 24A, 25A can be prescribed | regulated by a member. Thereby, the individual difference regarding the attachment position of the magnet division bodies 24A and 25A in the circumferential direction of the magnet protection cover 31 can be reduced, and desired performance can be obtained. As a result, the stability and reliability of the electromagnetic suspension 1 can be improved.

  In this embodiment, the case where eight cutouts 34 are provided on the outer peripheral surface 33A of the projection 33 has been described as an example. However, the number of cutouts 34 is not limited to eight. . That is, one or more notches 34 may be provided on the outer peripheral surface 33A of the protrusion 33.

  In the present embodiment, the case where the notches 34 are provided in the protrusions 33 on both sides in the axial direction of the magnet protective cover 31 has been described as an example. It is good also as a structure which provides a notch part only in any one protrusion part. Moreover, it is good also as a structure which provided the notch part in the outer peripheral surface of the said protrusion part by the structure which provided the protrusion part only in the edge part of the axial direction one side of a magnet protective cover like 1st Embodiment.

  Next, FIG. 11 and FIG. 12 show a fourth embodiment of the present invention. The feature of this embodiment is that a recess is provided on the side surface in the axial direction of the magnet protective cover. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The magnet protection cover 41 according to the fourth embodiment includes a magnet mounting portion 42 and a pair of protrusions 43, like the magnet protection cover 21 according to the second embodiment. In the third embodiment described above, the notch 34 is provided on the outer peripheral surface 33A of each projection 33 of the magnet protection cover 31, whereas in the present embodiment, the axial direction of the magnet protection cover 41 is A recess 44 is provided on the side surface 41A. The concave portion 44 is recessed from the axial side surface 41A of the magnet protective cover 41 (the axially outer side surface of the protrusion 43) to the inner side in the axial direction of the magnet protective cover 41. It is provided over the circumference. And the said recessed part 44 accumulates an excess adhesive agent between adjacent magnet protection covers 41 similarly to 3rd Embodiment mentioned above.

  Thus, also in the fourth embodiment configured as described above, it is possible to obtain the same effects as those of the above-described third embodiment.

  In particular, in the case of the present embodiment, since the recess 44 is provided over the entire circumference of the side surface 41 </ b> A of the magnet protection cover 41, a large amount of adhesive can be stored in the recess 44. On the other hand, in the case where the notch 34 is provided on the outer peripheral surface 33A of the projection 33 as in the third embodiment described above, a large number of the notches 34 are formed in order to store a large amount of adhesive. It is necessary to increase the processing cost because the notch 34 is increased. On the other hand, in the present embodiment, since the concave portion 44 that is recessed in the axial direction is provided on the side surface 41A of the magnet protection cover 41, a configuration that can store more excess adhesive can be obtained at low cost. .

  In the present embodiment, the case where the concave portion 44 is provided on each of the side surfaces 41A on both sides in the axial direction of the magnet protective cover 41 has been described as an example. It is good also as a structure provided only in one side surface of the both sides | surfaces of an axial direction.

  Further, in the present embodiment, the case where the concave portion 44 is provided over the entire circumference of the side surface 41A of the magnet protection cover 41 has been described as an example. It is good also as a structure which provides several recessed parts spaced apart in the direction.

  Moreover, it is good also as a structure which provides a recessed part in the side surface of the said magnet protective cover by the structure which provides a protrusion part only in the edge part of the axial direction one side of a magnet protective cover like 1st Embodiment.

  Furthermore, although illustration is omitted, the magnet protective cover may be provided with both a recess as in the present embodiment and a notch as in the third embodiment described above.

  Next, FIG. 13 shows a fifth embodiment of the present invention. The feature of this embodiment is that a magnet positioning projection is provided on the magnet mounting portion of the magnet protective cover. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The magnet protection cover 51 according to the fifth embodiment includes a magnet mounting portion 52 and a pair of protrusions 53, like the magnet protection cover 21 according to the second embodiment.

  A plurality of magnet positioning projections 54 extending in the axial direction of the magnet protection cover 51 are provided on the magnet mounting portion 52 so as to be spaced apart from each other in the circumferential direction. In the present embodiment, similarly to the above-described second embodiment, the magnet divided bodies 24A and 25A (see FIGS. 8 and 9) divided into eight parts are attached to the magnet attaching part 52. Accordingly, eight magnet positioning protrusions 54 are provided on the magnet mounting portion 52 so as to be spaced apart from each other in the circumferential direction at equal intervals.

  For example, when the magnet positioning projection 54 is attached to the magnet divided body 24A constituting the permanent magnet 24, the magnet divided bodies 24A adjacent to each other in the circumferential direction on the magnet mounting portion 52 are displaced due to the magnetic force. It is for preventing.

  Thus, also in the fifth embodiment configured as described above, it is possible to obtain the same effects as those of the second embodiment described above. In particular, in the present embodiment, the magnet divided body 24A (25A) constituting the permanent magnet 24 (25) can be positioned on the magnet mounting portion 52 of the magnet protective cover 51, that is, the magnet adjacent in the circumferential direction. Regardless of the magnetic force (attraction force, repulsive force) acting between the divided bodies 24A (25A), each magnet divided body 24A (25A) can be held between the magnet positioning projections 54. The workability at the time of attaching 24A (25A) to the magnet attachment part 52 can be improved.

  In the present embodiment, the case where the magnet positioning projections 54 and the permanent magnets 24 (25) are configured to have the same length in the axial direction has been described as an example. A configuration in which one magnet positioning projection smaller than the axial dimension of the magnet 24 (25) is provided in the central portion of the magnet mounting portion 52, or a plurality of magnet positioning projections are provided separately in the axial direction. Good. In short, the number of magnet positioning protrusions and axial dimensions can be set in consideration of the required strength, design specifications, cost, and the like.

  Furthermore, the magnet positioning projection can be provided on the magnet protective cover 18 according to the first embodiment described above. The same applies to the second to fourth embodiments and the sixth to eighth embodiments described later.

  Next, FIGS. 14 to 16 show a sixth embodiment of the present invention. The feature of this embodiment is that a fitting recess into which the end of the adjacent magnet protection cover on the other axial side is fitted is provided on one side of the magnet protection cover in the axial direction. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The magnet protection cover 61 according to the sixth embodiment includes a magnet attachment portion 62 and a projection 63, as with the magnet protection cover 18 according to the first embodiment. The side surface 61A of the magnet protective cover 61 on one side in the axial direction (left side in FIG. 15) is stepped from the side surface 61A and is recessed over the entire circumference toward the other side in the axial direction (right side in FIG. 15). A concavity 61B is provided. As shown in FIG. 14, the fitting recess 61 </ b> B is an end on the other axial side of the adjacent magnet protection cover 61 in the state where each magnet protection cover 61 is assembled to the cylindrical portion 11 </ b> A of the yoke 11, that is, a magnet. The end portion 62A of the attachment portion 62 is fitted.

  Thus, according to the sixth embodiment configured as described above, the end 62A on the other side in the axial direction of the magnet protection cover 61 and the fitting recess 61B on the one side in the axial direction of the magnet protection cover 61 are fitted. Therefore, the coaxiality between the adjacent magnet protection covers 61, that is, the coaxiality between the cylindrical portion 11A of the yoke 11 and the magnet protection cover 61 can be easily secured, and the assembly accuracy can be further improved.

  Next, FIG. 17 shows a seventh embodiment of the present invention. The feature of this embodiment is that the circumferential dimension of the notch provided in the projection of the magnet protective cover is configured to be substantially the same as the circumferential dimension of the magnet segment that constitutes the permanent magnet. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The magnet protection cover 71 according to the seventh embodiment includes a magnet mounting portion 72 and a pair of protrusions 73, like the magnet protection cover 21 according to the second embodiment. Each protrusion 73 is provided with one notch 74 facing each other in the axial direction. The notch 74 is recessed from the outer peripheral surface 73 </ b> A of the protrusion 73 inward in the radial direction of the magnet protection cover 71, and the bottom surface 74 </ b> A is continuous with the outer peripheral surface 72 </ b> A of the magnet attachment portion 72. That is, the radius of curvature of the bottom surface 74A of the notch 74 and the radius of the outer peripheral surface 72A of the magnet mounting portion 72 are the same.

  The circumferential dimension of the notch 74 is substantially the same as the circumferential dimension of the magnet segments 24A and 25A constituting the permanent magnets 24 and 25 (the circumferential dimension of the notch ≧ the circumferential dimension of the magnet segment). Yes. That is, the permanent magnets 24 and 25 of the present embodiment are divided into eight parts, that is, eight permanent magnets 24A and 25A, respectively, similarly to the permanent magnets of the second embodiment. Yes. Therefore, in the present embodiment, the circumferential dimension of the notch 74 is set to 45 degrees as the central angle.

  In the case of this embodiment, the notch 74 has a function of accumulating excess adhesive between the adjacent magnet protective covers 71, and the magnet divided bodies 24 </ b> A and 25 </ b> A are attached to the magnet mounting portion 72. When attached, it has a function of passing the magnet divided bodies 24A and 25A attached last in the axial direction. That is, for example, when the magnet divided body 24A is attached to the magnet attaching portion 72, the same shape and the same dimensions as the magnet divided body 24A are provided in advance on the outer peripheral surface 72A of the magnet attaching portion 72 at a position corresponding to the notch 74 in the axial direction. A nonmagnetic replacement spacer 75 is attached. And after attaching seven magnet division bodies 24A to parts other than the replacement spacer 75 in the outer peripheral surface 72A of the magnet attachment portion 72, as shown by an arrow in FIG. 17, the eighth magnet division to be attached last. The body 24A is pushed through the notch 74 on one side in the axial direction (left side in FIG. 17). At this time, the replacement spacer 75 is pushed out from the magnet attachment portion 72 through the cutout portion 74 on the other side in the axial direction (right side in FIG. 17). In this case, regardless of the magnetic force (attraction force, repulsive force) acting between the magnet divided body 24A attached last and the magnet divided body 24A already attached, the last magnet divided body 24A is attached to the magnet mounting portion 72. Can be installed smoothly.

  Thus, also in the seventh embodiment configured as described above, it is possible to allow excess adhesive to escape to the notch 74, so that the same effect as the third embodiment described above can be obtained. . Further, in the case of the present embodiment, when the magnet divided bodies 24A and 25A constituting the permanent magnets 24 and 25 are attached to the magnet protective cover 71, the replacement spacer 75 can be attached while being pushed out through the notch 74. Thereby, the work which attaches magnet division object 24A, 25A to magnet protection cover 71 can be facilitated.

  Next, FIGS. 18 and 19 show an eighth embodiment of the present invention. In the above-described first to seventh embodiments, the case where the movable element 10 of the electromagnetic suspension 1 is arranged on the outer peripheral side of the stator 2 has been described as an example. On the other hand, in this Embodiment, it is set as the structure which arrange | positions a needle | mover to the inner peripheral side of a stator. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The electromagnetic suspension 81 is a shock absorber (linear actuator) using a linear motor, and generally includes a stator 82 as a first member and a movable element 84 as a second member. The stator 82 (the armature 83) and the mover 84 (the permanent magnets 86A and 86B) constitute a linear motor.

  The stator 82 includes an armature 83. In the present embodiment, the stator 82 is disposed on the outer peripheral side of the movable element 84 (the movable element 84 is disposed on the inner peripheral side of the stator 82).

  The mover 84 extends in the axial direction within the stator 82 and is accommodated in the stator 82 via a bearing (not shown) so as to be able to be displaced in the stroke direction (axial direction). Here, the mover 84 is roughly constituted by a yoke 85 and a plurality of permanent magnets 86A and 86B.

  The yoke 85 is formed in a cylindrical shape with a bottom using, for example, a magnetic body, and has a cylindrical portion 85A extending in the axial direction as a stroke direction, and a bottom portion 85B that closes the other end side (left end side in FIG. 18) of the cylindrical portion 85A. It is comprised by. The bottom 85B is provided with a bracket 85C attached to, for example, an unsprung member (for example, an axle) of the vehicle.

  A plurality of cylindrical permanent magnets 86 </ b> A and 86 </ b> B are arranged in the axial direction with opposite polarities on the outer peripheral surface side of the cylindrical portion 85 </ b> A of the yoke 85.

  A magnet protection cover 87 is provided on the outer peripheral side of each permanent magnet 86A, 86B. The magnet protection cover 87 individually protects the permanent magnets 86A and 86B in the same manner as the magnet protection cover of each of the embodiments described above. Here, the magnet protection cover 87 is located on the cylindrical magnet attachment portion 88 to which the permanent magnets 86A and 86B are attached, and one end side of the magnet attachment portion 88 (the right end side in FIGS. 18 and 19). It is constituted by a protrusion 89 that protrudes radially inward from the outer peripheral surface of the attachment portion 88. Thereby, the magnet protection cover 87 has a configuration in which a protruding portion 89 that protrudes in the thickness direction of the permanent magnets 86A and 86B is provided on the end portion on one side (right side) in the axial direction over the entire circumference.

  Thus, in the eighth embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. That is, in the case of the present embodiment as well, both the protection of the permanent magnets 86A and 86B and the improvement of the assemblability of the permanent magnets 86A and 86B can be achieved at the same time as in the first embodiment.

  In the present embodiment, the case where the protrusion 89 is provided at the end on the one side in the axial direction of the magnet protection cover 87 has been described as an example. However, the present invention is not limited to this. It is good also as a structure provided in the edge part of the axial direction both sides of a cover.

  Moreover, it is good also as a structure which provides the notch part recessed in the radial direction outer side of a magnet protection cover in the surrounding surface of a projection part, or provided the recessed part dented in the axial direction of a magnet protection cover in the side surface of a projection part.

  In the first embodiment described above, the case where the protrusion is provided over the entire circumference has been described as an example. However, the present invention is not limited to this, and for example, a configuration in which the protrusions are provided intermittently in the circumferential direction may be employed. The same applies to the magnet protective cover of the second embodiment.

  In the first to seventh embodiments described above, the first member out of the first member and the second member supported so as to be capable of relative linear motion is the stator 2, and the second member is the mover 10. The case has been described as an example. However, the present invention is not limited to this. For example, the first member of the first member and the second member may be a mover and the second member may be a stator. The same applies to the stator 82 and the mover 84 according to the eighth embodiment.

  In the first to seventh embodiments described above, the stator 2 is attached to a sprung member (for example, a vehicle body) of a vehicle, and the mover 10 is attached to an unsprung member (for example, an axle) of the vehicle. Explained with an example. However, the present invention is not limited to this. For example, the stator may be attached to the unsprung member of the vehicle, and the mover may be attached to the sprung member of the vehicle. The same applies to the stator 82 and the mover 84 according to the eighth embodiment.

  In the above-described first to seventh embodiments, the case where the electromagnetic suspension 1 is configured to be mounted on a vehicle such as an automobile in a vertically placed state has been described as an example. It is good also as a structure attached to vehicles, such as a railway vehicle, in a horizontal state. The same applies to the electromagnetic suspension 81 according to the eighth embodiment.

  In the above-described first to seventh embodiments, the case where the electromagnetic suspension 1 is configured to be attached to a vehicle has been described as an example. However, the present invention is not limited to this, and for example, various machines and buildings that serve as vibration sources. You may use for the electromagnetic suspension used for etc. The same applies to the electromagnetic suspension 81 according to the eighth embodiment.

  According to the above embodiment, it is possible to achieve both protection of the permanent magnet and improvement in assembly of the permanent magnet.

  That is, since the magnet protective cover is individually provided for each permanent magnet, the permanent magnet can be stably protected by each magnet protective cover. In this case, the cost can be reduced, and the processing accuracy and the assembly accuracy can be improved as compared with the conventional protective cover that is long in the axial direction. Further, when the permanent magnet and the magnet protective cover are assembled to the second member, the assembly can be integrally assembled to the second member as an assembly (assembly) in which the permanent magnet is attached to the magnet protective cover. The assembly work can be facilitated and simplified.

  According to the embodiment, since the projection is provided at the end of the magnet protective cover on the one side in the axial direction, the permanent magnets adjacent in the axial direction are spaced apart by the axial thickness of the projection. They can be placed facing each other. Thereby, it is possible to secure an axial interval (gap) between adjacent permanent magnets and to protect the permanent magnets from contact with the armature with a single magnet protective cover. That is, the number of parts can be reduced as compared with the case where the spacer and the magnet protective cover for ensuring the axial interval of the permanent magnet are provided separately.

  According to the embodiment, since the protrusions are provided at the end portions on both sides in the axial direction of the magnet protective cover, the peripheral surfaces (outer peripheral surface or inner peripheral surface) of the two protruding portions are used as the peripheral surface of the yoke ( An inner peripheral surface or an outer peripheral surface). In this case, by ensuring the dimensional accuracy between the peripheral surface of the protrusion and the peripheral surface of the yoke, the axis of the cylindrical portion of the yoke can be easily aligned with the axis of the magnet protective cover (ensure coaxiality). Assembly accuracy can be improved.

  According to the embodiment, since the cutout portion is provided on the peripheral surface of the protrusion, excess adhesive when adhering the magnet protective covers adjacent in the axial direction can be released to the cutout portion. Thereby, the thickness of an adhesive agent can be contained in a design value, and the assembly precision of an axial direction can be improved. Furthermore, since the adhesive is accumulated in the notch, the adhesive is evenly distributed with a necessary thickness (thinness) on the adhesive surface, and the adhesive strength can be improved. Thereby, ensuring of adhesive strength and ensuring of the precision of an axial direction can be made compatible in high dimension.

  According to the embodiment, since the concave portion is provided on the side surface of the magnet protective cover, excess adhesive when the magnet protective covers are bonded to each other can be released to the concave portion, and the peripheral surface of the protrusion is notched. As with the configuration in which the portion is provided, it is possible to achieve both high levels of securing adhesive strength and ensuring axial dimension accuracy.

  According to the embodiment, the magnet protective cover is provided with the magnet positioning projection. For example, when the permanent magnet divided in the circumferential direction is attached to the magnet protective cover, the attracting / It is possible to suppress the movement of the magnet due to the repulsive force. Thereby, workability | operativity (easiness of work) of the attachment work of the permanent magnet to a magnet protective cover is securable.

1,81 Electromagnetic suspension 2,82 Stator 6,83 Armature 10,84 Movable member 17A, 17B, 24, 25, 86A, 86B Permanent magnet 24A, 25A Magnet segment 18, 21, 31, 41, 51, 61 , 71, 87 Magnet protective cover 20, 23, 33, 43, 53, 63, 73, 89 Protruding part 34, 74 Notch part 44 Recessed part 54 Magnet positioning protrusion

Claims (5)

A linear motor in which one of the first member and the second member supported so as to be capable of relative linear motion is a stator, and the other member of the first member and the second member is a mover. In electromagnetic suspension using
The first member includes an armature,
The second member includes a plurality of cylindrical permanent magnets arranged side by side in the axial direction of the second member,
The second member is provided with a cylindrical magnet protection cover for each of the permanent magnets, which covers a peripheral surface of the inner peripheral side and outer peripheral side of each permanent magnet that faces the armature. At the end of the one axial side of the cover, electromagnetic suspension, characterized in that it has a structure in which Ru is provided over the protruding portion that protrudes in the thickness direction of the permanent magnet in the circumferential direction. A linear motor in which one of the first member and the second member supported so as to be capable of relative linear motion is a stator, and the other member of the first member and the second member is a mover. In electromagnetic suspension using
The first member includes an armature,
The second member includes a plurality of cylindrical permanent magnets arranged side by side in the axial direction of the second member,
The second member is provided with a cylindrical magnet protection cover for each of the permanent magnets, which covers a peripheral surface of the inner peripheral side and outer peripheral side of each permanent magnet that faces the armature. An electromagnetic suspension characterized in that a projecting portion protruding in the thickness direction of the permanent magnet is provided in the circumferential direction at both ends in the axial direction of the cover. Wherein the circumferential surface of the protrusion, the electromagnetic suspension according to claim 1 or 2 comprising a structure provided with a cutout portion recessed in the radial direction of the magnet protection cover. The electromagnetic suspension according to claim 1 , 2, or 3 , wherein a concave portion that is recessed in the axial direction of the magnet protection cover is provided on a side surface in the axial direction of the magnet protection cover. Wherein the circumferential surface of the magnet protection cover, electromagnetic suspension according to the preceding claims by separating the magnet positioning protrusions extending in the axial direction of the magnet protection cover in the circumferential direction becomes a plurality providing structure 2, 3 or 4 .

Images