WO2018174235A1 - リニアモータ - Google Patents
リニアモータ Download PDFInfo
- Publication number
- WO2018174235A1 WO2018174235A1 PCT/JP2018/011655 JP2018011655W WO2018174235A1 WO 2018174235 A1 WO2018174235 A1 WO 2018174235A1 JP 2018011655 W JP2018011655 W JP 2018011655W WO 2018174235 A1 WO2018174235 A1 WO 2018174235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic pole
- mover
- back yoke
- linear motor
- armature
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to a linear motor that extracts a linear motion output by combining a mover and a stator.
- the linear motor is generally configured by combining a mover having a plurality of rectangular permanent magnets and an armature having a plurality of magnetic pole teeth.
- a linear motor that can obtain a large acceleration with a small mass.
- the permanent magnet of the mover is not opposed to the entire surface of the armature as the stator, but is movable.
- a linear motor having a configuration in which the arrangement length of permanent magnets in the child is shorter than the length of the armature is employed.
- This type of linear motor includes a mover having a magnet array in which a plurality of permanent magnets are arrayed and a flat plate-shaped back yoke integrated with the magnet array, and an armature having a drive coil in each of a plurality of magnetic pole teeth. Is configured to face each other with a gap.
- the mover magnet arrangement and back yoke
- the difference in length between the mover and the armature becomes the operable stroke of the linear motor.
- the mover When the mover is composed of a back yoke formed of a ferromagnetic material and a magnet arrangement, an attractive force is generated between the opposing stator. Due to the generated suction force, a large vertical drag acts on the bearing that supports the mover so as to be movable in a predetermined direction. This normal drag brings about a shortened life of the bearing. Further, the direction in which the normal force acts is a direction that intersects the movable direction of the mover. Therefore, it is necessary to select a bearing in consideration of the normal drag. Therefore, a larger bearing is selected than a bearing that conforms to the load of the mover. This leads to an increase in the size of the entire linear motor.
- linear motors have been proposed in which only the magnet arrangement functions as a mover and the back yoke functions as a stator (Patent Documents 3 to 5, etc.).
- the magnet arrangement and the flat back yoke are separated, a gap is formed on the opposite side of the armature, the back yoke is opposed to the magnet arrangement, and only the magnet arrangement can be moved. Only the magnet array moves, and the back yoke does not move like the armature.
- the length of the magnet array is shorter than the length of the armature, and the difference in length is the stroke at which the linear motor can operate.
- JP 2005-269822 A Republished patent WO2016 / 159034 JP 2005-117856 A JP2015-130754A JP 2005-184984 A
- the mover is strongly attracted to the magnetic pole tooth surfaces of the opposing armature.
- the suction force F at this time is expressed by the following formula.
- F B 2 S / 2 ⁇ 0 (Where B: magnetic flux density on the magnetic pole teeth of the electrode, S: effective area facing the mover and armature, ⁇ 0 : permeability of vacuum)
- the gap between the magnet array and the back yoke is widened to reduce the magnetic flux density of the gap, and the attractive force between the magnet array and the back yoke is reduced to the same extent as the attractive force between the magnet array and the armature. It is possible. However, when the gap between the magnet array and the back yoke is widened, the magnetic flux density for generating the thrust from the armature also decreases, and there is a problem that the thrust becomes small. Therefore, in the separation type linear motors proposed so far, there is a problem that a reduction in thrust is inevitable in order to reduce the attractive force acting on the mover.
- the attractive force between the mover (magnet arrangement) and the stator (armature) and the attractive force between the mover and the back yoke have substantially the same magnitude. Since the directions are opposite, the suction force acting on the mover can be reduced.
- the eddy current generated in the back yoke during operation is increased by separating the back yoke and the magnet arrangement. An increase in eddy current leads to heat generation.
- Such a linear motor is not suitable for a stage drive source in an apparatus that needs to keep the environmental temperature within a predetermined range, for example, a semiconductor manufacturing apparatus.
- the present invention has been made in view of such circumstances, and provides a linear motor that can greatly reduce the suction force and reduce the detent force while achieving a compact configuration and generation of a large thrust.
- the purpose is to do.
- Another object of the present invention is to provide a linear motor capable of suppressing eddy currents while reducing the attractive force acting on the magnet arrangement.
- a linear motor includes a mover having a magnet arrangement in which a plurality of rectangular permanent magnets are arranged, a back yoke as a stator that is opposed to the mover with a gap, and the mover
- An armature as a stator disposed opposite to the back yoke with a gap therebetween, and the magnetization direction of each of the plurality of permanent magnets is a thickness direction, and adjacent permanent magnets
- the magnetizing direction is reverse
- the armature has a plurality of magnetic pole teeth each having a drive coil wound at an equal pitch
- the back yoke is arranged on the surface facing the mover.
- a mover having a magnet arrangement in which a plurality of permanent magnets are arranged, a back yoke disposed opposite to the mover with a gap, and a gap on the opposite side of the back yoke.
- An armature disposed opposite to the mover.
- the magnet arrangement functions as a mover, and the back yoke and armature function as a stator.
- Each of the plurality of rectangular permanent magnets in the magnet array is magnetized in the thickness direction, and the magnetization directions are opposite between adjacent permanent magnets.
- the armature has a plurality of magnetic pole teeth at an equal pitch, and a drive coil is wound on each magnetic pole tooth.
- the surface facing the mover is not flat, and a plurality of magnetic pole teeth are formed at an equal pitch.
- the pitch of the magnetic pole teeth in the back yoke is equal to the pitch of the magnetic pole teeth of the armature, and the position of the magnetic pole teeth in the back yoke is the same position as the magnetic pole teeth of the armature in the moving direction of the mover (linear motor).
- the magnetic pole area of the magnetic pole teeth of the back yoke is 0.9 to 1.1 times the magnetic pole area of the magnetic pole teeth of the armature. Further, the gap between the mover and the back yoke is not less than the gap between the mover and the armature.
- the back yoke is provided with magnetic pole teeth having substantially the same magnetic pole area at the same position as the armature. That is, only the back yoke portion to which the drive magnetic flux from the armature is applied is brought close to the mover, and the gap from the mover is opened except for the portion facing the magnetic pole teeth of the armature. Since the magnetic pole area of the armature facing the mover and the magnetic pole area of the back yoke facing the mover are substantially equal, they are effectively canceled out and the overall attractive force is greatly reduced. Therefore, the suction force can be significantly reduced without increasing the gap between the mover and the back yoke. At this time, since it is not necessary to increase the gap between the mover and the back yoke, the reduction in thrust is small.
- the shear region of the driving magnetic flux is generated in the back yoke due to the uneven shape due to the formation of the magnetic pole teeth on the back yoke, not only the armature but also the back yoke contributes to the generation of thrust.
- This thrust generation compensates for a decrease in thrust due to the increase in the gap (air gap) with the mover at two places, and a large thrust as a whole can be obtained. Therefore, the attractive force acting on the magnet arrangement (mover) can be greatly reduced while maintaining a large thrust.
- a mover is provided between an armature having a plurality of magnetic pole teeth at an equal pitch and a back yoke having a plurality of magnetic pole teeth in the same position as the armature magnetic pole teeth. Since the cogging of the magnet arrangement in the direction perpendicular to the movable direction is reduced, the detent force of the mover can be reduced.
- the magnetic pole area of the magnetic pole teeth of the back yoke magnetic pole teeth is set to 0.9 to 1.1 times the magnetic pole area of the magnetic pole teeth of the armature.
- the drive coil is wound on the armature magnetic pole teeth, the armature magnetic pole teeth are not so low, and the height of the armature magnetic pole teeth is higher than the height of the magnetic pole teeth in the back yoke. For this reason, since the height of the magnetic pole teeth is low in the back yoke, a magnetic flux is also generated in a portion other than the magnetic pole teeth, and the attractive force tends to be larger than that of the armature side. Therefore, the gap between the mover and the back yoke is made equal to or larger than the gap between the mover and the armature so that the suction force can be efficiently canceled.
- the linear motor according to the present invention is characterized in that the height of the magnetic pole teeth in the back yoke is not less than 1/20 times and not more than twice the pitch of the magnetic pole teeth.
- the height of the magnetic pole teeth of the back yoke is made too small compared to the pitch, the effect of providing the magnetic pole teeth (uneven shape) cannot be obtained. If the height is made too large compared to the pitch, the effect does not change and the size goes down. Therefore, the height of the magnetic pole teeth in the back yoke is set to 1/20 times or more and 2 times or less of the pitch of the magnetic pole teeth.
- the linear motor according to the present invention is characterized in that the length of the mover is shorter than the length of the armature and shorter than the length of the back yoke.
- the length of the mover is shorter than the length of each of the armature and the back yoke. Therefore, it is a small configuration and a large acceleration can be secured. Further, since the edge effect is reduced, the cogging torque is reduced and the detent force can be reduced.
- the linear motor according to the present invention is characterized in that the size of the gap between the mover and the back yoke and / or the size of the gap between the mover and the armature is variable.
- the size of the gap between the mover and the back yoke and / or the size of the gap between the mover and the armature is variable. Therefore, by adjusting the size of the gap between the mover and the back yoke and / or the size of the gap between the mover and the armature according to the magnitude of the driving magnetomotive force at the time of use, the attraction force is almost zero. It is possible to
- a linear motor includes a mover having a magnet arrangement in which a plurality of rectangular permanent magnets are arranged, a back yoke as a stator that is opposed to the mover with a gap, and the mover
- An armature as a stator disposed opposite to the back yoke with a gap therebetween, and the magnetization direction of each of the plurality of permanent magnets is a thickness direction, and adjacent permanent magnets
- the magnetizing direction is reverse
- the armature has a plurality of magnetic pole teeth each having a drive coil wound at an equal pitch
- the back yoke is arranged on the surface facing the mover.
- the armature has a plurality of magnetic pole teeth at the same position in the moving direction of the armature and the magnetic teeth of the armature, and the magnetic pole teeth of the back yoke have a plurality of plate-like members in the moving direction of the mover. Laminated in the direction that intersects And wherein the door.
- the linear motor of the present invention it is possible to reduce the eddy current while reducing the attractive force acting on the mover by making the magnetic pole teeth have a laminated structure.
- the back yoke has a plurality of plate-like members stacked in the stacking direction of the magnetic pole teeth.
- the plate member constituting the laminated portion of the back yoke and the plate member constituting the magnetic pole teeth are integrated.
- the back yoke can further reduce the eddy current by forming a part of the thickness direction from the connecting portion with the magnetic pole teeth in a laminated structure. Further, since the plate-like member constituting the laminated portion of the back yoke and the plate-like member constituting the magnetic pole teeth are integrated, the number of manufacturing steps can be reduced.
- the linear motor according to the present invention is characterized in that the plurality of plate-like members are subjected to insulation treatment on the laminated surface.
- the eddy current can be further reduced.
- the mover has a holding member for holding the magnet arrangement, and the holding member has a plurality of holes into which the plurality of permanent magnets are inserted. It is characterized by that.
- the magnet arrangement (a plurality of permanent magnets) is held by the holding member. Therefore, since the rigidity of the mover (magnet arrangement) is increased, the detent force can be reduced because deformation such as bending and bending of the permanent magnet hardly occurs.
- the linear motor according to the present invention is characterized in that the mover has a plate-like base material to which the holding member and the plurality of permanent magnets are bonded and fixed.
- the magnet array (plural permanent magnets) and the holding member are bonded and fixed to the plate-like base material in a state where the plural permanent magnets are inserted into the holes of the holding member. Therefore, the rigidity of the mover (magnet arrangement) can be further increased to further reduce the detent force, and the permanent magnet can be prevented from falling off.
- the attractive force acting on the mover can be greatly reduced and the detent force of the mover can be reduced while realizing a small configuration and generation of a large thrust. Can do. Therefore, the deformation
- FIG. 1 is a perspective view illustrating a configuration of a linear motor according to a first embodiment.
- 1 is a side view showing a configuration of a linear motor according to a first embodiment.
- FIG. 3 is a plan view illustrating a configuration of a mover in the linear motor according to the first embodiment.
- FIG. 3 is an exploded perspective view illustrating a configuration of a mover in the linear motor according to the first embodiment.
- FIG. 3 is a side view showing the flow of magnetic flux in the linear motor according to the first embodiment.
- FIG. 3 is a diagram illustrating a side shape of a back yoke in the linear motor according to the first embodiment.
- 3 is a plan view showing an armature material used for manufacturing an armature in the linear motor according to Embodiment 1.
- FIG. 3 is a diagram showing armature windings in the linear motor of the first embodiment.
- FIG. 3 is a top view illustrating a configuration of the linear motor according to the first embodiment.
- 1 is a side view showing a configuration of a linear motor according to a first embodiment.
- 4 is a graph showing a variation in thrust with respect to an electrical angle of a linear motor as an example of the first embodiment.
- 3 is a graph showing thrust characteristics of an example linear motor according to the first embodiment.
- 3 is a graph showing the attractive force characteristics of a linear motor as an example of Embodiment 1; It is a side view which shows the structure of the linear motor of the 1st prior art example (structure which integrated the magnet arrangement
- FIG. 1 It is a top view which shows the structure of the linear motor of a 1st prior art example. It is a side view which shows the structure of the linear motor of a 1st prior art example. It is a side view which shows the structure of the linear motor of the 2nd prior art example (structure which used only the magnet arrangement
- FIG. 1 shows the average thrust in the linear motor of a 1st prior art example, a 2nd prior art example, and an example of Embodiment 1.
- FIG. 6 is a graph showing average suction force in the linear motor of the first conventional example, the second conventional example, and an example of the first embodiment.
- 5 is a graph showing thrust characteristics of a linear motor of another example of the first embodiment.
- 6 is a graph showing the attractive force characteristics of a linear motor of another example of the first embodiment.
- 6 is a graph showing thrust characteristics of a linear motor of still another example of the first embodiment.
- 6 is a graph showing the attractive force characteristics of a linear motor of still another example of the first embodiment.
- FIG. 6 is a perspective view illustrating a configuration example of a linear motor according to a second embodiment.
- FIG. 6 is a side view illustrating a configuration example of a linear motor according to a second embodiment.
- It is a partial side view of a linear motor. 6 is a graph showing Joule loss of a linear motor in a basic example of the second embodiment. 6 is a graph showing Joule loss of a linear motor in a first modification of the second embodiment. It is a side view which shows the other structural example of a back yoke. It is a perspective view which shows the structural example of a magnetic-pole-tooth unit. It is a perspective view which shows the structural example of a magnetic-pole-tooth unit. It is a perspective view which shows the structural example of a base part. It is a side view which shows the other structural example of a back yoke. It is a perspective view which shows the structural example of a base part.
- FIG. 1 and 2 are a perspective view and a side view showing the configuration of the linear motor 1 of the first embodiment.
- 3 and 4 are a plan view and an exploded perspective view showing a configuration example of the mover 2 in the linear motor 1 of the first embodiment. 1 and 2, only the mover 2 represents a cross section from a direction parallel to the movable direction so that the arrangement of the magnets can be understood.
- the linear motor 1 includes a mover 2, a back yoke 3, and an armature 4.
- a back yoke 3 is disposed opposite to the mover 2 with a gap
- an armature 4 is disposed opposite to the back yoke 3 with a gap between the mover 2.
- the back yoke 3 and the armature 4 function as a stator.
- the elongated mover 2 includes a plurality of permanent magnets 21, a holding frame 22, and a fixed plate 23 as shown in FIG. 4.
- the juxtaposition direction of the plurality of permanent magnets 21 is the longitudinal direction of the mover 2.
- Each permanent magnet 21 has a rectangular shape.
- Each permanent magnet 21 is, for example, a Nd—Fe—B rare earth magnet.
- Each permanent magnet 21 is magnetized in the thickness direction (vertical direction in FIG. 2), and the magnetization directions of the adjacent permanent magnets 21 and 21 are opposite to each other. That is, in the magnet arrangement, the permanent magnet 21 magnetized in the direction from the back yoke 3 side toward the armature 4 side and the permanent magnet 21 magnetized in the direction from the armature 4 side toward the back yoke 3 side alternately. Is arranged.
- the holding frame 22 has a rectangular plate shape.
- the thickness of the holding frame 22 is smaller than the thickness of the permanent magnet 21.
- the holding frame 22 is provided with a plurality of rectangular holes 221.
- the holding frame 22 is made of a nonmagnetic material such as SUS or aluminum.
- the hole 221 has a shape corresponding to the permanent magnet 21.
- Each permanent magnet 21 is fitted into the hole 221 and fixed to the holding frame 22 with an adhesive.
- the holes 221 are provided so that the permanent magnets 21 fixed to the holding frame 22 are juxtaposed at an equal pitch. Further, when the permanent magnet 21 is fixed to the holding frame 22, the permanent magnet 21 is fitted into the hole 221 so that the magnetization directions of the adjacent permanent magnets 21 and 21 are opposite to each other. As shown in FIG. 3, each permanent magnet 21 is skewed at an angle ⁇ .
- the holding frame 22 is fixed to the fixing plate 23 with an adhesive while the plurality of permanent magnets 21 are inserted and held in the holes 221 of the holding frame 22.
- the bottom surfaces of the permanent magnets 21 are also bonded to the fixed plate 23.
- the fixed plate 23 is made of nonmagnetic SUS or the like. As described above, since the magnet array is held by the holding frame 22 and bonded and fixed to the fixing plate 23, the mover 2 has high rigidity and the permanent magnet 21 does not fall off.
- the mover 2 is disposed in the gap between the back yoke 3 and the armature 4 so that the fixed plate 23 faces the back yoke 3.
- the fixing plate 23 is not essential and is not necessary when the permanent magnet 21 is sufficiently held by the holding frame 22.
- the lengths of the back yoke 3 and the armature 4 in the movable direction are substantially equal, and the lengths of the movable element 2 in the movable direction (left and right direction in FIG. 2) are the same. 4 is shorter than the length in 4, and the difference in length is a stroke at which the linear motor 1 can operate. With such a configuration, the edge effect is reduced.
- the surface of the back yoke 3 that is made of mild steel, preferably a soft magnetic material (for example, silicon steel plate), that is not opposed to the mover 2 is flat, but the surface of the back yoke 3 that faces the mover 2 is Instead of a flat plate shape, a plurality of rectangular magnetic pole teeth 31 are formed at equal pitches in the movable direction.
- the height of each magnetic pole tooth 31 is 1/20 or more and 2 or less, preferably 1/10 or more and 1 or less, the formation pitch of the magnetic pole teeth 31.
- the height of each magnetic pole tooth 31 is about half of the formation pitch of the magnetic pole teeth 31.
- armature 4 a plurality of rectangular magnetic pole teeth 42 made of a soft magnetic material are integrally provided on a core 41 made of a soft magnetic material at an equal pitch in a movable direction, and a drive coil is provided on each magnetic pole tooth 42. 43 is sown.
- the pitch of the magnetic pole teeth 31 in the back yoke 3 is equal to the pitch of the magnetic pole teeth 42 of the armature 4, and the positions of the magnetic pole teeth 31 in the back yoke 3 are the magnetic pole teeth 42 of the armature 4 in the moving direction of the mover 2.
- the position is the same.
- the shape of the magnetic pole face of the magnetic pole teeth 31 of the back yoke 3 facing the mover 2 has a rectangular shape substantially the same as the magnetic pole face of the magnetic pole teeth 42 of the armature 4 facing the mover 2,
- the former magnetic pole area is 0.9 to 1.1 times the latter magnetic pole area.
- the magnetic pole surface of the magnetic pole tooth 31 and the magnetic pole surface of the magnetic pole tooth 42 have the same rectangular shape and the same area.
- the gap between the mover 2 and the back yoke 3 is the same as or larger than the gap between the mover 2 and the armature 4.
- the latter gap is 0.5 mm
- the former gap is 0.5 mm or more.
- the gap between the mover 2 and the back yoke 3 in this case does not include the thickness of the fixed plate 23 even when the fixed plate 23 is included, and the distance between the mover 2 itself and the back yoke 3 (shortest) Distance).
- this gap is a magnetic gap (magnetic gap), and it is not necessary to consider the thickness of the fixed plate 23 that is a non-magnetic material.
- the linear motor 1 of the first embodiment has a basic configuration of seven poles and six slots in which seven permanent magnets 21, six magnetic pole teeth 31 and magnetic pole teeth 42 face each other.
- the form shown in FIGS. 1 and 2 has a 14-pole 12-slot configuration that doubles the basic configuration.
- the back yoke 3 has a magnetic pole surface having substantially the same shape at the same position in the movable direction as the magnetic pole teeth 42 of the armature 4 on the surface facing the mover 2. Magnetic pole teeth 31 having substantially the same magnetic pole area are formed. Therefore, the magnitude of the suction force generated between the mover 2 and the back yoke 3 is substantially equal to the magnitude of the suction force generated between the mover 2 and the armature 4, and both suction forces are in the vertical direction in FIG. Is effectively canceled out, the suction force acting on the mover 2 as the whole linear motor 1 becomes very small.
- the suction force can be significantly reduced without increasing the gap between the mover 2 and the back yoke 3. Therefore, there is no need to increase the gap between the mover 2 and the back yoke 3, so that the thrust is not reduced.
- the armature 4 having a plurality of magnetic pole teeth 42 at an equal pitch, and the plurality of magnetic pole teeth 42 of the armature 4 in the movable direction and in the same position. Since the mover 2 is arranged between the back yoke 3 having the magnetic pole teeth 31 and the cogging torque of the magnet arrangement in the direction perpendicular to the movable direction is reduced, the detent force of the mover 2 is reduced. Reduction can be achieved. Further, since the magnet array is held by the holding frame 22 and is fixed to the fixing plate 23, the rigidity of the mover 2 can be increased, so that the permanent magnet 21 is not easily deformed such as bending and bending. However, it contributes to the reduction of the detent force of the mover 2.
- FIG. 5 is a side view showing the flow of magnetic flux in the linear motor 1 of the first embodiment.
- arrows indicate the flow of magnetic flux.
- thrust is generated by the shearing of the magnetic flux on the armature 4 side, and the thrust is also generated by the shearing of the magnetic flux on the back yoke 3 side. Is the total.
- no thrust is generated on the back yoke side, and only the thrust due to magnetic flux shearing on the armature side. It becomes.
- the suction force acting on the mover 2 can be greatly reduced while maintaining a large thrust. Therefore, the mover 2 hardly bends due to the suction force, and the dimensional accuracy in a processing machine in a semiconductor manufacturing apparatus using the linear motor 1 becomes very high.
- the linear motor 1 of the first embodiment since the attractive force can be reduced, there is no problem even if the permanent magnet 21 and the holding frame 22 having low rigidity are used. Therefore, it is possible to reduce the size of the mover 2 and to realize a large acceleration as the mover 2 is reduced in weight. Further, since the mover 2 is less worn, the life of the linear motor 1 can be extended.
- the linear motor in order to move the mover smoothly, it is common to provide a linear guide on the side surface of the mover as described later.
- the suction force is small. Therefore, a linear guide having a low rigidity can be used, which also contributes to the miniaturization and long life of the linear motor.
- the length of the mover 2 is made shorter than the lengths of the back yoke 3 and the armature 4, thereby further reducing the size, weight and speed.
- a skew angle ⁇ 3.2 ° is applied to the 14 permanent magnets 21 coated with adhesive so that the magnetization directions of the adjacent permanent magnets 21 are opposite to each other in the holes 221 of the holding frame 22. Then, the permanent magnet 21 was adhered and fixed to the holding frame 22 and the fixing plate 23.
- the thickness of the holding frame 22 is set to 3 mm with respect to the thickness of the permanent magnet 21 so that both the weight reduction of the mover 2 and the large rigidity of the magnet arrangement can be realized.
- the holding frame 22 may be manufactured by a method in which six SUS plates having a thickness of 0.5 mm are punched by pressing and stacked and fixed by caulking. good. In this case, the manufacturing cost can be reduced.
- FIG. 6 is a view showing a side shape of the back yoke 3 in the linear motor 1 according to the first embodiment.
- a block having dimensions as shown in FIG. 6 is cut out from mild steel (JIS standard G3101 type symbol SS400 material) and 18 magnetic pole teeth 31 having the same shape (width: 6 mm, height: 3 mm, length: 82 mm, A back yoke 3 having a magnetic pole area of 492 mm 2 ) at an equal pitch (15.12 mm) was produced.
- FIG. 7 is a plan view showing an armature material used for manufacturing the armature 4 in the linear motor 1 of the first embodiment.
- 164 pieces of an armature material 44 having a shape as shown in FIG. 7 are cut out from a 0.5 mm-thick silicon steel plate (JIS standard C2552 type symbol 50A800 material), and the cut out 164 pieces are overlapped with a CO 2 laser.
- FIG. 8 is a diagram illustrating windings of the armature 4 in the linear motor 1 according to the first embodiment.
- a drive coil 43 was obtained by impregnating an arm portion of each magnetic pole tooth 42 of the armature 4 with an enamel-coated conductor wire having a diameter of 2 mm 17 times by impregnating with varnish.
- U, V, and W represent the U-phase, V-phase, and W-phase, respectively, of the three-phase AC power supply, and the coils of each phase are all connected in series.
- the U, V, and W coils are wired so that the current flows clockwise when viewed from above, and the -U, -V, and -W coils are wired so that the current flows counterclockwise when viewed from above.
- an armature 4 was produced.
- Six U coils, -U coils, V coils, -V coils, W coils, and -W coils were connected in a star connection to a three-phase AC power source.
- the manufactured back yoke 3 and armature 4 were fixed using a jig so that the distance between them was kept constant at 6 mm. Although the gap between the back yoke 3 and the armature 4 is fixed to 6 mm, the gap can be adjusted after the linear motor 1 is assembled. Next, after a linear guide (not shown) is attached to the side surface of the mover 2, the gap between the back yoke 3 and the armature 4 is separated from the back yoke 3 and the armature 4 by a predetermined distance, and the thickness is 5 mm. The linear motor 1 was produced by inserting the mover 2.
- the distance of the gap between the mover 2 and the magnetic pole teeth 31 of the back yoke 3 and the distance of the gap between the mover 2 and the magnetic pole teeth 42 of the armature 4 were both 0.5 mm. Further, a load cell was provided between the linear guide and the armature 4 so that the suction force could be measured.
- the distance between the mover 2 and the armature 4 is constant, and the mover 2 and the back yoke 3 ( The distance of the gap with the magnetic pole teeth 31) can be arbitrarily set to be variable. It should be noted that by adjusting the insertion position of the mover 2 into the gap between the back yoke 3 and the armature 4, the distance between the mover 2 and the back yoke 3 (the magnetic pole teeth 31), and the mover 2 and the electric machine It is also possible to set the ratio of the gap distance to the child 4 (the magnetic pole teeth 42) to a desired value.
- a mechanism for adjusting the gap between the linear guide that supports the armature 4 and the mover 2 and between the armature 4 and the back yoke 3 a mechanism for adjusting the height by inserting a gap adjusting screw or a cross-sectional shape It is possible to employ a mechanism for adjusting the height by inserting a shim plate having a taper shape with a screw.
- FIGS 9A and 9B are diagrams showing a configuration of the linear motor 1 as an example of the first embodiment manufactured as described above, FIG. 9A is a top view thereof, and FIG. 9B is a side view thereof.
- the white arrow indicates the magnetization direction of the permanent magnet 21, and the solid arrow indicates the movable direction of the mover 2.
- the details of the production specifications of the linear motor 1 are as follows.
- Magnetic pole configuration 7 poles, 6 slots Permanent magnet 21
- Material Nd-Fe-B rare earth magnet (NMX made by Hitachi Metals) -S49CH material
- the shape of the permanent magnet 21 thickness 5.0mm, width 12mm, length 82mm Permanent magnet 21 pitch: 12.96 mm Skew angle of the permanent magnet 21: 3.2 °
- Shape of back yoke 3 thickness 6.0 mm, width 90 mm, length 263.04 mm Back Yoke 3
- Material Mild Steel (JIS Standard G3101 Type Code SS400 Material)
- Material of core 41 silicon steel plate (JIS standard C2552 type symbol 50A800 material)
- the shape of the magnetic pole teeth 42 width 6.0 mm, height: 25 mm, length: 82 mm Pitch of magnetic pole teeth 42:
- the length (190 mm) of the mover 2 is shorter than the lengths of the back yoke 3 and the armature 4 (both 263.04 mm).
- the pitch of the magnetic pole teeth 31 in the back yoke 3 and the pitch of the magnetic pole teeth 42 in the armature 4 are all equal to 15.12 mm, and the magnetic pole teeth 31 and the magnetic pole teeth 42 are at the same position in the movable direction.
- the shape of the magnetic pole face of the magnetic pole teeth 31 facing the magnet arrangement and the shape of the magnetic pole face of the magnetic pole teeth 42 facing the magnet arrangement are rectangular with the same dimensions. That is, the width of the magnetic pole teeth 31 (the dimension in the movable direction) and the width of the magnetic pole teeth 42 (the dimensions in the movable direction) are both 6 mm and are equal, and the magnetic pole area of the magnetic pole teeth 31 facing the magnet arrangement and the magnet arrangement.
- the magnetic pole areas of the opposing magnetic pole teeth 42 are all equal to 492 mm 2 .
- the linear motor 1 assembled in this way is installed on a test bench for thrust measurement, and is driven by a three-phase constant current power source synchronized with the position of the mover 2 (magnet arrangement) to move the mover 2 to generate thrust and suction. The force was measured.
- FIG. 10 is a graph showing the thrust fluctuation with respect to the electrical angle of the linear motor 1 as an example of the first embodiment.
- the horizontal axis represents the electrical angle [°]
- the vertical axis represents the thrust [N].
- a represents the thrust by the armature 4
- b in the figure represents the thrust by the back yoke 3
- c in the figure represents the total thrust (thrust added by the thrust by the armature 4 and the thrust by the back yoke 3).
- FIG. 11 is a graph showing the thrust characteristics of the linear motor 1 as an example of the first embodiment.
- This thrust characteristic represents a characteristic when the current applied to the drive coil 43 is changed.
- the horizontal axis represents the drive magnetomotive force [A]
- the left vertical axis represents the thrust [N]
- the right vertical axis represents the thrust magnetomotive force ratio [N / A].
- a represents the thrust
- b in the figure represents the thrust magnetomotive force ratio.
- the thrust proportional limit is 1000 N when the driving magnetomotive force is 1200A.
- FIG. 12 is a graph showing the attractive force characteristics of the linear motor 1 as an example of the first embodiment.
- This attraction force characteristic represents a characteristic when the current applied to the drive coil 43 is changed.
- the horizontal axis represents the driving magnetomotive force [A]
- the vertical axis represents the attractive force [N].
- the suction force indicates that the mover 2 is attracted to the armature 4 side on the + side, and the mover 2 is attracted to the back yoke 3 side on the ⁇ side.
- the attractive force increases. For example, when the driving magnetomotive force is 1200 A, the movable element 2 is attracted to the back yoke 3 side with an attractive force of about 290 N.
- linear motor 1 of the first embodiment in comparison with the conventional linear motor, two types of linear motors (first conventional example and second conventional example) are manufactured as conventional examples, and those linear motors 1 are manufactured. Characteristics (thrust force and suction force) were measured.
- FIG. 13 is a side view showing the configuration of the linear motor of the first conventional example.
- the first conventional example is a linear motor (integrated linear motor) having a configuration according to Patent Document 1 or 2.
- the linear motor 50 of the first conventional example includes a mover 51 in which a magnet array 52 and a back yoke 53 are integrated, and an armature 54 that is disposed to face the mover 51 with a gap.
- a structure in which the magnet array 52 and the back yoke 53 are integrated functions as a mover, and the armature 54 functions as a stator.
- the configuration of the magnet array 52 is the same as the configuration of the magnet array of the mover 2 described above. That is, the magnet array 52 is configured by holding and fixing a plurality of rectangular permanent magnets 55 on a nonmagnetic material holding frame at an equal pitch and installing them in a movable direction (left-right direction in FIG. 13). 55 is magnetized in the thickness direction (vertical direction in FIG. 13), and the magnetization directions of the adjacent permanent magnets 55, 55 are opposite to each other.
- the magnet array 52 is bonded to a flat steel back yoke 53 made of mild steel.
- the configuration of the armature 54 is the same as the configuration of the armature 4 described above, and a plurality of magnetic pole teeth 57 are integrally provided on the core 56 at an equal pitch in the movable direction.
- the drive coil 58 is wound on the front.
- FIG. 14A and 14B are diagrams showing the configuration of the linear motor 50 of the first conventional example, FIG. 14A is a top view thereof, and FIG. 14B is a side view thereof.
- the white arrow indicates the magnetization direction of the permanent magnet 55, and the solid arrow indicates the movable direction of the mover 51.
- mover 51 and the armature 54 was 0.5 mm or 1 mm. Details of the production specifications of the linear motor 50 are as follows.
- Magnetic pole configuration 7 poles, 6 slots Permanent magnet 55
- Material Nd-Fe-B rare earth magnet (NMX made by Hitachi Metals) -S49CH material)
- Shape of the permanent magnet 55 thickness 5.0mm, width 12mm, length 82mm Permanent magnet 55 pitch: 12.96 mm Skew angle of permanent magnet 55: 3.2 °
- Shape of the back yoke 53 thickness 6.0mm, width 90mm, length 190mm
- Material of back yoke 53 Mild steel (JIS standard G3101 type symbol SS400 material)
- Material of core 56 silicon steel plate (JIS standard C2552 type symbol 50A800 material)
- the shape of the drive coil 58 width 15.12mm, height 23mm, length 91.12mm Winding thickness of drive coil 58: 4.06
- the length of the mover 51 (integrated configuration of the magnet array 52 and the back yoke 53) in the movable direction (left-right direction in FIG. 13) is shorter than the length of the armature 54, and the difference in length is the difference of the linear motor 50.
- the stroke is operable.
- FIG. 15 is a side view showing the configuration of the linear motor of the second conventional example.
- the second conventional example is a linear motor (separated linear motor) having a configuration according to Patent Documents 3 to 6.
- the magnet array 62 represents a cross section from a direction parallel to the movable direction so that the arrangement of the magnets can be understood.
- the linear motor 60 of the second conventional example has a magnet array 62, a back yoke 63 disposed opposite to the magnet array 62 with a gap therebetween, and a counter arrangement opposite to the back yoke 63 with a gap formed between the magnet arrays 62. Armature 64. Only the magnet array 62 functions as a mover, and the back yoke 63 and the armature 64 function as a stator.
- the configuration of the magnet array 62 is the same as the configuration of the magnet array of the mover 2 described above. That is, the magnet array 62 is configured by a plurality of rectangular permanent magnets 65 being held and fixed on a nonmagnetic material holding frame at an equal pitch and installed in a movable direction (left and right direction in FIG. 15). 65 is magnetized in the thickness direction (vertical direction in FIG. 15), and the magnetization directions of the adjacent permanent magnets 65, 65 are opposite to each other.
- the back yoke 63 made of mild steel has a flat plate shape not only on the surface that does not face the magnet array 62 but also on the surface that faces the magnet array 62, and the magnetic pole teeth like the linear motor 1 of the first embodiment. Does not exist.
- the configuration of the armature 64 is the same as the configuration of the armature 4 described above, and a plurality of magnetic pole teeth 67 are integrally provided on the core 66 at an equal pitch in the movable direction.
- the drive coil 68 is wound on the front.
- FIG. 16A and 16B are diagrams showing the configuration of the linear motor 60 of the second conventional example, FIG. 16A is a top view thereof, and FIG. 16B is a side view thereof.
- the white arrow indicates the magnetization direction of the permanent magnet 65
- the solid arrow indicates the movable direction of the magnet array 62 (movable element). Note that the size of the gap between the magnet array 62 and the back yoke 63 and the size of the gap between the magnet array 62 and the armature 64 were both 0.5 mm. Details of the production specifications of the linear motor 60 are as follows.
- Magnetic pole configuration 7 poles, 6 slots Permanent magnet 65
- Material Nd-Fe-B rare earth magnet (NMX made by Hitachi Metals) -S49CH material)
- Permanent magnet 65 shape thickness 5.0 mm, width 12 mm, length 82 mm Permanent magnet 65 pitch: 12.96 mm Skew angle of permanent magnet 65: 3.2 °
- Back yoke 63 shape thickness 6.0 mm, width 90 mm, length 215 mm
- Material of back yoke 63 Mild steel (JIS standard G3101 type symbol SS400 material)
- Material of core 66 silicon steel plate (JIS standard C2552 type symbol 50A800 material)
- the length of the magnet array 62 in the movable direction (left-right direction in FIG. 15) is shorter than the length of the armature 64, and the difference in length is an operable stroke of the linear motor 60.
- FIG. 17 is a graph showing average thrusts in the linear motors of the first conventional example, the second conventional example, and the first embodiment.
- FIG. 17 represents the average thrust [N] when the driving magnetomotive force is 1200 A.
- FIG. 18 is a graph showing the average suction force in the linear motors of the first conventional example, the second conventional example, and the example.
- FIG. 18 shows the average attractive force [N] when the driving magnetomotive force is 1200A.
- the average thrust and the average attractive force are obtained by measuring (calculating) 25 thrusts and attractive forces at 15 ° intervals in the range of the U-phase electrical angle of 0 ° to 360 °, and calculating the average.
- A is a first conventional example in which the magnet array 52 and the back yoke 53 are integrated, and the linear motor 50 (hereinafter referred to as “the gap between the movable element 51 and the armature 54” is 0.5 mm).
- B is a linear motor 50 (hereinafter referred to as a linear motor) in which a gap between the mover 51 and the armature 54 is 1 mm in the first conventional example in which the magnet array 52 and the back yoke 53 are integrated.
- C is the second conventional example in which the magnet array 62 and the back yoke 63 are separated from each other, and the gap between the magnet array 62 and the back yoke 63, and the magnet array 62 and the armature 64
- the linear motor 60 has a gap of 0.5 mm
- D is an example of Embodiment 1 in which magnetic pole teeth 31 are formed on the back yoke 3 separated from the mover 2 (magnet arrangement). back Gap between the over click 3, and a linear motor 1 that both was 0.5mm the gap between the mover 2 and the armature 4.
- the linear motor 50A (A in the figure) of the first conventional example has the largest thrust of 1030N, but the suction force is 4200N, which is a large value about four times the thrust.
- the thrust obtained is significantly reduced to 909N, whereas the suction force is not reduced so much and is 3360N. Therefore, it is understood that it is not a sufficient measure.
- the linear motor 1 (D in the figure) as an example of the first embodiment, a large thrust of 1000 N, which is comparable to the linear motor 50A, can be obtained. Further, the suction force can be greatly reduced to 290 N (about 1/14 of the linear motor 50A) on the back yoke 3 side. Therefore, in the linear motor 1 as an example of the first embodiment, it has been proved that the suction force can be significantly reduced while maintaining a large thrust.
- the magnitude of the attractive force varies depending on the magnitude of the driving magnetomotive force. Therefore, if the size of the gap between the mover 2 and the back yoke 3 is adjusted in accordance with a frequently used thrust region (drive magnetomotive force), the attractive force can be further reduced.
- the gap between the mover 2 and the back yoke 3 and the gap between the mover 2 and the armature 4 are both equal to 0.5 mm.
- the gap between the mover 2 and the armature 4 remains 0.5 mm, and the gap between the mover 2 and the back yoke 3 is 0.74 mm.
- Other configurations are the same as the above-described example.
- FIG. 19 is a graph showing the thrust characteristics of the linear motor 1 of another example of the first embodiment
- FIG. 20 is a graph showing the attractive force characteristics of the linear motor 1 of another example of the first embodiment.
- the horizontal axis represents the drive magnetomotive force [A]
- the left vertical axis represents the thrust [N]
- the right vertical axis represents the thrust magnetomotive force ratio [N / A]
- a is the thrust
- b is the thrust magnetomotive force.
- Each represents a ratio
- the horizontal axis represents the drive magnetomotive force [A]
- the vertical axis represents the attractive force [N].
- the thrust is 978 N when the driving magnetomotive force is 1200 A, which is a little lower than the above-described example, but the attractive force is only 18 N when the driving magnetomotive force is 1200 A and is almost zero.
- This is a suction force at which the linear guide, the mover, and the surrounding structure can be ignored due to the deformation and life reduction due to the suction force. Therefore, when using with the driving magnetomotive force of 1200 A vicinity, it turns out that the linear motor 1 of another example is more suitable for the objective of reduction of an attractive force compared with the example mentioned above.
- the linear motor 1 in which the gap between the mover 2 and the armature 4 remains 0.5 mm and the gap between the mover 2 and the back yoke 3 is 0.66 mm. was made.
- Other configurations are the same as the above-described example.
- FIG. 21 is a graph showing thrust characteristics of the linear motor 1 of still another example of the first embodiment
- FIG. 22 is a graph showing suction force characteristics of the linear motor 1 of still another example of the first embodiment. It is.
- the horizontal axis represents the driving magnetomotive force [A]
- the left vertical axis represents the thrust [N]
- the right vertical axis represents the thrust magnetomotive force ratio [N / A]
- a is the thrust
- b is the thrust magnetomotive force.
- Each represents a ratio
- the horizontal axis represents the driving magnetomotive force [A]
- the vertical axis represents the attractive force [N].
- the linear motor 1 of still another example is optimal for reducing the attractive force.
- the example in which the size of the gap between the mover 2 and the armature 4 is fixed and the size of the gap between the mover 2 and the back yoke 3 is changed has been described. Further, an example in which the size of the gap between the mover 2 and the armature 4 is changed by fixing the size of the gap between the mover 2 and the back yoke 3, the size of the gap between the back yoke 3 and the armature 4. It is also possible to realize a suction force close to zero by, for example, changing the position of the mover 2 while fixing.
- the linear motor 1 having the structure in which the movable element 2 is shorter than the armature 4 has been described.
- the linear motor having the structure in which the movable element is longer than the armature is also described in the present invention.
- the feature formation of magnetic pole teeth on the back yoke is applicable.
- the linear motor 1 includes the mover 2, the back yoke 3, and the armature 4, and the back yoke 3 and the armature 4 function as a stator.
- the configurations of the mover 2 and the armature 4 in the linear motor 1 of the second embodiment are the same as the configurations of the mover 2 and the armature 4 in the linear motor 1 of the first embodiment described above. The description is omitted.
- the back yoke 3 includes magnetic pole teeth 31 and a base plate 32.
- the base plate 32 has a rectangular plate shape.
- the magnetic pole teeth 31 are fixed to the base plate 32.
- the magnetic pole teeth 31 are fixed so that a part thereof protrudes from the base plate 32.
- the shape of the protruding part is a rectangular parallelepiped shape.
- the plurality of magnetic pole teeth 31 are arranged at an equal pitch along the longitudinal direction of the base plate 32.
- the magnetic pole teeth 31 are formed of a laminated silicon steel plate as will be described later.
- the base plate 32 is made of carbon steel such as SS400, for example.
- the back yoke 3 and the armature 4 are arranged to face each other with a gap.
- the mover 2 is disposed in the gap.
- the first surface of the mover 2 faces the back yoke 3 with a gap.
- the second surface facing the first surface of the mover 2 faces the armature 4 with a gap.
- the lengths of the back yoke 3 and the armature 4 in the movable direction are substantially equal.
- the pitch of the magnetic pole teeth 31 in the back yoke 3 is equal to the pitch of the magnetic pole teeth 42 of the armature 4.
- the positions of the magnetic pole teeth 31 in the back yoke 3 are the same as the positions of the magnetic pole teeth 42 of the armature 4 in the moving direction of the mover 2.
- the magnetic pole surface of the magnetic pole tooth 31 and the magnetic pole surface of the magnetic pole tooth 42 have the same rectangular shape and the same area.
- the gap between the mover 2 and the back yoke 3 is substantially the same as the gap between the mover 2 and the armature 4.
- the magnetization directions of the adjacent permanent magnets 21 and 21 are opposite to each other.
- the permanent magnet 21 magnetized in the direction from the back yoke 3 side to the armature 4 side, and from the armature 4 side to the back yoke 3 side.
- the permanent magnets 21 magnetized in the direction are alternately arranged.
- an attractive force is generated between the magnetic pole teeth 31 of the back yoke 3 and the permanent magnet 21 of the mover 2.
- An attractive force is also generated between the magnetic pole teeth 42 of the armature 4 and the permanent magnet 21 of the mover 2.
- Two suction forces acting on the mover 2 are in opposite directions.
- the magnitude of the attractive force can be made substantially equal.
- the attractive force generated between the magnetic pole teeth 31 and the permanent magnet 21 and the attractive force generated between the magnetic pole teeth 42 and the permanent magnet 21 can be balanced. That is, the two suction forces can be canceled out. If it is difficult to balance the two attractive forces due to factors such as processing errors and assembly errors, the distance between the magnetic pole teeth 31 and the permanent magnet 21 or the distance between the magnetic pole teeth 42 and the permanent magnet 21 is adjusted. To balance the two suction forces.
- the linear motor 1 according to the second embodiment has the same configuration as the linear motor 1 according to the first embodiment described above.
- the suction force acting on the mover 2 can be greatly reduced while maintaining a large thrust.
- the detent force of the mover 2 can be reduced as in the linear motor 1 according to the first embodiment.
- FIG. 25 is a perspective view illustrating a configuration example of the magnetic pole teeth 31 included in the back yoke 3.
- the magnetic pole tooth 31 has a T-shaped cross section and has two projecting portions 31a and 31a projecting from the bottom portion (lower side in FIG. 25) in the lateral direction.
- the protrusions 31 a and 31 a are portions that engage with recesses 32 a and 32 a of an ant groove 321 described later).
- the short direction of the magnetic pole teeth 31 is parallel to the movable direction of the mover 2.
- the magnetic pole teeth 31 are formed by laminating magnetic pole pieces 311.
- the pole piece 311 includes an engaging protrusion 311a formed by cutting out a part of a rectangular plate shape.
- the pole piece 311 is formed of a thin plate such as silicon steel having soft magnetism.
- the stacked magnetic pole pieces 311 are fixed by heat welding or caulking. In the case of heat welding, for example, first, a surface of the pole piece 311 is coated with a thermosetting adhesive or a heat-welding coating is applied, and then heated while applying pressure to the plate surface after lamination. .
- the pole pieces 311 are fixed by heating.
- the eddy current loss decreases as the thickness of the magnetic pole piece 311 constituting the magnetic pole tooth 31 is reduced, that is, as the number of the magnetic pole pieces 311 is increased.
- the thickness of the pole piece 311 is preferably about 0.2 to 0.5 mm.
- the number and thickness of the magnetic pole pieces 311 constituting the magnetic pole teeth 31 may be appropriately designed according to required specifications.
- FIG. 26 is a partial perspective view showing a configuration example of the base plate 32 included in the back yoke 3.
- FIG. 26 is drawn upside down from FIGS. 24 and 25 for convenience of explanation.
- the base plate 32 is provided with dovetail grooves 321 along the short direction.
- the dovetail 321 has a shape corresponding to the protruding portion 311 a of the magnetic pole piece 311 (the protruding portion 31 a of the magnetic pole tooth 31).
- the dovetail 321 has a recess 32a corresponding to the protrusion 311a (protrusion 31a).
- the base plate 32 is formed with a plurality of dovetail grooves 321.
- the plurality of dovetail grooves 321 are provided at an equal pitch along the movable direction of the mover 2.
- the arrangement direction of the plurality of dovetail grooves 321 is a direction parallel to the movable direction of the mover 2 when the linear motor 1 is operated.
- FIG. 27 is a partial perspective view of the back yoke 3. Similarly to FIG. 26, for the convenience of explanation, it is drawn with the up and down directions of FIGS. 24 and 25 reversed.
- the protruding portion 31 a of the magnetic pole tooth 31 is engaged with the dovetail groove 321.
- the fixing of the magnetic pole teeth 31 to the base plate 32 is performed as follows, for example. Adhesive is applied to one or both of the dovetail 321 and the magnetic pole teeth 31. Using a jig or the like, the magnetic pole teeth 31 are fitted into the dovetail groove 321 for positioning. When the adhesive is cured, remove the jig.
- the fixing method is not limited to this. Other methods may be used as long as the pitch of the magnetic pole teeth 31 and the amount of protrusion of the magnetic pole teeth 31 from the base plate 32 can be fixed within a predetermined error range.
- the linear motor 1 generates magnetic flux that flows through the magnetic pole teeth 42 of the armature 4, the permanent magnet 21 of the mover 2, and the magnetic pole teeth 31 of the back yoke 3 by applying a three-phase alternating current to the drive coil 43 of the armature 4. To do.
- the attraction force generated between the mover 2 and the armature 4 by the generated magnetic flux and the attraction force generated between the mover 2 and the back yoke 3 become the thrust of the mover 2, and the mover 2 moves. .
- FIG. 28 is a partial side view of the linear motor 1.
- an example of the flow of magnetic flux is indicated by a solid line arrow
- an example of eddy current is indicated by a dotted line arrow.
- the magnetic flux flows in the vertical direction on the paper. That is, it flows in a direction parallel to the plate surface of the magnetic pole piece 311 constituting the magnetic pole tooth 31.
- the eddy current tends to flow in a direction that prevents the magnetic flux from changing on a plane perpendicular to the direction in which the magnetic flux flows. That is, in the case shown in FIG.
- the direction of the eddy current is a direction that tries to penetrate the plate surface of the magnetic pole piece 311 constituting the magnetic pole tooth 31.
- the magnetic pole teeth 31 are formed by laminating a plurality of magnetic pole pieces 311 and the electric resistance between the magnetic pole pieces 311 is large, so that eddy current can be reduced. Further, when an insulating film is applied to the plate surface (front surface) of the magnetic pole piece 311, the eddy current flowing between the magnetic pole pieces 311 can be further reduced.
- FIG. 29A and 29B are graphs showing an example of Joule loss due to eddy current
- FIG. 29A is a graph showing Joule loss of a linear motor according to a related technique
- FIG. 29B is a linear motor in a basic example of the second embodiment. It is a graph which shows 1 Joule loss.
- the difference in configuration between the linear motor according to the related technology and the linear motor in the second embodiment is as follows.
- the former does not have a laminated structure of magnetic pole teeth.
- the magnetic pole teeth in the former are soft magnetic blocks.
- the base plate 32 and the magnetic pole teeth 31 may be integrally formed of a soft magnetic material.
- the magnetic pole teeth 31 have a laminated structure.
- Other conditions, the structure and dimensions of the linear motor, the number of coil turns, and the driving conditions were the same.
- the driving current of the coil is 70.6 A
- the moving speed of the mover is 1000 mm / s.
- the horizontal axis is an electrical angle indicating the position of the mover 2.
- the unit of the horizontal axis is degree (°).
- the vertical axis in FIGS. 29A and 29B is Joule loss due to eddy current.
- the unit is watt (W).
- the graph attached with the back yoke shows the Joule loss at the back yoke.
- FIG. 29A in a linear motor according to a related technology that does not have a laminated structure of magnetic pole teeth, the Joule loss at the back yoke is around 80 W, whereas the magnetic pole teeth 31 have a laminated structure. In the linear motor 1, the Joule loss in the back yoke 3 is reduced to about 50W.
- the graphs labeled U, V, and W show the Joule loss due to energization generated in the coil U phase, V phase, and W phase, respectively, in absolute values.
- the Joule loss in the coil due to energization of the coil is the same, but there is a large difference in the Joule loss in the back yoke.
- This result is an example showing that Joule loss due to eddy currents can be reduced when a laminated structure is used instead of a laminated structure of magnetic pole teeth under the same size and shape, and the linear motor size and linear motor speed are reduced.
- the absolute value of Joule loss due to eddy current changes, but the ratio of both effects at the same speed is maintained.
- the linear motor 1 in Embodiment 2 has the following effects.
- the magnetic pole teeth 31 are formed by laminating magnetic pole pieces 311 formed of silicon steel plates. Therefore, the direction of the eddy current is a direction to penetrate the plate surface. At this time, the electric resistance in the eddy current direction in the magnetic pole teeth 31 is caused by the gap between the surfaces of the magnetic pole pieces 311, the contact resistance between the magnetic pole pieces, the oxide film formed on the surface of the magnetic pole pieces 311, etc. It is larger than the case where it is formed with. Therefore, the eddy current flowing through the magnetic pole teeth 31 can be reduced.
- the surface (stacked surface) of the pole piece 311 may be subjected to an insulation process such as forming a coating of an insulating material. When the insulation process is performed, eddy currents can be further reduced between the silicon steel plates.
- the magnetic pole teeth 31 of the back yoke 3 have a laminated structure.
- the entire back yoke is formed of a laminated steel plate, there is a concern that the rigidity is lowered.
- the back yoke 3 may be bent due to the suction force generated between the movable element 2 and the back yoke 3.
- the base plate 32 to which the magnetic pole teeth 31 are fixed is not a laminated structure.
- the bending of the back yoke 3 is based on a related technique (when the magnetic pole teeth 31 and the base plate 32 are each formed of a soft magnetic material, or when the magnetic pole teeth 31 and the base plate 32 are integrally formed of a soft magnetic material). Compared with, it is slight.
- FIG. 30 is a side view showing another configuration example of the back yoke 3.
- the back yoke 3 includes a base portion 33 and a magnetic pole tooth block 34.
- the magnetic pole tooth block 34 includes a fitted portion 34 a and a plurality of magnetic pole teeth 31.
- FIG. 31 is a perspective view showing a configuration example of the magnetic pole tooth block 34.
- the magnetic pole tooth block 34 is formed by laminating a plurality of magnetic pole tooth pieces (plate-like members) 341.
- the stacking direction of the magnetic pole tooth pieces 341 is a direction that intersects the arrangement direction of the magnetic pole teeth 31.
- the magnetic pole tooth piece 341 includes a fitted portion 341a, a connecting portion 341b, and a plurality of protruding portions 341c.
- the fitted portion 341a has an inverted trapezoidal cross section.
- the fitted portion 341 a is a portion that becomes the fitted portion 34 a of the magnetic pole tooth block 34.
- the protrusion 341c has a rectangular cross section.
- the plurality of protrusions 341 c are formed at an equal pitch in the longitudinal direction of the magnetic pole piece 341.
- the protruding portion 341 c is a portion that becomes the magnetic pole teeth 31 of the magnetic pole tooth block 34.
- the connecting portion 341b is a portion located between the fitted portion 341a and the protruding portion 341c in the height direction of the magnetic pole tooth piece 341.
- the connecting portion 341b connects the plurality of protruding portions 341c.
- the magnetic pole tooth piece 341 is made of, for example, a silicon steel plate.
- the connecting portion 341b is a plate-like member that constitutes a laminated portion that becomes a part of the base portion of the back yoke 3.
- the protruding portion 341 c is a plate-like member that constitutes the magnetic pole teeth 31.
- the magnetic pole tooth piece 341 is obtained by integrating two plate-like members.
- FIG. 32 is a perspective view showing a configuration example of the base portion 33.
- the base portion 33 shown in FIG. 32 is inverted upside down from the base portion 33 shown in FIG.
- the base part 33 has a rectangular plate shape.
- the base portion 33 has a fitting groove 33a having a trapezoidal cross section.
- the fitted portion 34 a of the magnetic pole tooth block 34 is fitted into the fitting groove 33 a of the base portion 33.
- the length of the movable element 2 in the movable direction may be set according to the length of the magnetic pole tooth block 34 in the movable direction.
- the magnetic pole tooth block 34 is fixed to the base portion 33 as follows. After the adhesive is applied to one or both of the fitting groove 33a and the fitting portion 34a, the fitting is performed. Thereby, the base part 33 and the magnetic pole tooth block 34 are fixed. As a result, the back yoke 3 is formed.
- FIG. 33 is a partial side view of the linear motor 1.
- an example of the flow of magnetic flux is indicated by a solid arrow
- an example of an eddy current is indicated by a dotted arrow.
- the reduction of the eddy current in the magnetic pole teeth 31 is the same as that in the basic example described above, and thus the description thereof is omitted.
- the reduction of the eddy current at the connection portion 341b of the magnetic pole tooth block 34 will be described.
- the magnetic flux flows in the left-right direction on the paper surface at the connecting portion 341b. That is, it flows in a direction parallel to the plate surface of the magnetic pole tooth piece 341 constituting the magnetic pole tooth block 34.
- the eddy current tends to flow in a direction that prevents the magnetic flux from changing on a plane perpendicular to the direction in which the magnetic flux flows. That is, as shown in FIG. 33, the magnetic flux tends to flow counterclockwise about the direction in which the magnetic flux flows.
- the direction of this eddy current is a direction that tries to penetrate the plate surface of the magnetic pole tooth piece 341 constituting the magnetic pole tooth block 34.
- the magnetic pole tooth block 34 has a plurality of magnetic pole tooth pieces 341 stacked and the electric resistance between the magnetic pole tooth pieces 341 is increased, eddy current can be reduced. Furthermore, when an insulating coating is applied to the plate surface, the eddy current flowing between the magnetic pole tooth pieces 341 can be further reduced.
- connection part 341b will be described. As shown in FIG. 33, let d be the height of the connecting portion 341b. Magnetic flux flowing between adjacent magnetic pole teeth 31 flows in the left-right direction on the paper. The path through which the magnetic flux flows is the shortest path. Therefore, the magnetic flux does not flow in a portion away from the magnetic pole teeth 31 by a certain distance or more. Therefore, the height d of the connecting portion 341b may be a value that allows a sufficient amount of magnetic flux in the left-right direction on the paper surface to flow. Further, the base portion 33 where the magnetic flux does not flow can be formed of a nonmagnetic material. For example, the base portion 33 is formed of alumina having a high rigidity and a high Young's modulus. Alternatively, nonmagnetic stainless steel or aluminum alloy can be used.
- FIG. 34A and 34B are graphs showing an example of Joule loss due to eddy current
- FIG. 34A is a graph showing Joule loss of the linear motor 1 in the basic example.
- FIG. 34A is a reproduction of FIG. 29B.
- FIG. 34B is a graph showing Joule loss of the linear motor 1 in the first modification.
- the magnetic pole teeth 31 have a laminated structure
- a part of the magnetic pole teeth and the base plate has a laminated structure.
- Other conditions, the structure and dimensions of the linear motor, the number of coil turns, and the driving conditions were the same.
- the driving current of the coil is 70.6 A
- the moving speed of the mover is 1000 mm / s.
- the Joule loss of the back yoke 3 is around 50 W
- the back yoke 3 joule loss is reduced to around 2.5W.
- the connection part 341b has a laminated structure, and eddy currents due to magnetic flux flowing through the connection part 341b are also reduced.
- the graphs labeled U, V, and W indicate absolute values of Joule loss due to energization generated in the coil U phase, V phase, and W phase, respectively.
- the Joule loss in the coil due to energization of the coil is the same, but there is a large difference in the Joule loss in the back yoke.
- This result shows that the latter can reduce Joule loss due to eddy current when the magnetic pole teeth and the back yoke are partly laminated with the same dimension and shape.
- the absolute value of Joule loss due to eddy current varies depending on the size of the linear motor and the speed of the linear motor, but the ratio of both effects at the same speed is maintained.
- the magnetic pole tooth block 34 is configured by laminating silicon steel plates (magnetic pole tooth pieces 341).
- the linear motor 1 has a laminated structure in a part in the thickness direction from the connection portion with the magnetic pole teeth 31 of the back yoke 3. For this reason, the magnetic flux flowing between the adjacent magnetic pole teeth 31 to the connecting portion 341 b is in a direction parallel to the surface of the magnetic pole tooth piece 341. The direction of the eddy current generated by the flow of the magnetic flux is a direction to penetrate the plate surface of the magnetic pole piece 341.
- the electrical resistance in the eddy current direction in the connecting portion 341b is larger than that in the case of not having a laminated structure due to a gap on the surface of the magnetic pole tooth piece 341 or an oxide film formed on the surface. Therefore, it is possible to reduce the eddy current flowing through the connection portion 341b. Therefore, the eddy current flowing through the back yoke 3 can be further reduced.
- the base portion 33 which is a part of the back yoke 3 can be formed of a nonmagnetic material, it can be formed of a material having a high Young's modulus, such as alumina. Thereby, since the rigidity of the entire back yoke 3 is increased, it is possible to reduce the bending due to the attractive force generated between the back yoke 3 and the mover 2. Furthermore, when the rigidity of the entire back yoke 3 is higher than the required rigidity of the base portion 33, the back yoke 3 can be made thinner.
- FIG. 35 is a side view showing another configuration example of the back yoke 3.
- the back yoke 3 includes a plurality of back yoke units 301 and a back yoke unit 302.
- the back yoke unit 301 includes a base portion 35 and a magnetic pole tooth unit 36.
- the back yoke unit 302 includes a base portion 35 and a magnetic pole tooth unit 37.
- the difference between the back yoke unit 301 and the back yoke unit 302 is the difference between the magnetic pole tooth units included.
- One end of the back yoke 3 is a back yoke unit 301 and the other end is a back yoke unit 302. Thereby, as shown in FIG. 35, it is possible to constitute the back yoke 3 having the magnetic pole teeth 31 at both ends.
- FIG. 36A and 36B are perspective views showing a configuration example of the magnetic pole tooth units 36 and 37
- FIG. 36A shows a configuration example of the magnetic pole tooth unit 36
- FIG. 36B shows a configuration example of the magnetic pole tooth unit 37
- the magnetic pole tooth unit 36 includes a plurality of magnetic pole teeth 31 formed in a comb shape and a fitted portion 36a.
- the magnetic pole teeth 31 have a rectangular cross section.
- the fitted portion 36a has an inverted trapezoidal cross section.
- the magnetic pole tooth unit 36 is formed by laminating a plurality of magnetic pole tooth pieces (plate-like members) 361.
- the stacking direction of the magnetic pole tooth pieces 361 is a direction crossing the arrangement direction of the magnetic pole teeth 31.
- the magnetic pole tooth piece 361 includes a fitted portion 361a, a connecting portion 361b, and a plurality of protruding portions 361c.
- the fitted portion 361a has an inverted trapezoidal cross section.
- the fitted portion 361 a is a portion that becomes the fitted portion 36 a of the magnetic pole tooth unit 36.
- the protrusion 361c has a rectangular cross section.
- the plurality of protrusions 361 c are formed at an equal pitch in the longitudinal direction of the magnetic pole piece 361.
- the protruding portion 361 c is a portion that becomes the magnetic pole teeth 31 of the magnetic pole tooth unit 36.
- the connecting portion 361b is a portion located between the fitted portion 361a and the protruding portion 361c in the height direction of the magnetic pole tooth piece 361.
- the connecting portion 361b connects the plurality of protruding portions 361c.
- the magnetic pole tooth piece 361 is made of, for example, a silicon steel plate.
- the connecting portion 361b is a plate-like member that constitutes a laminated portion that becomes a part of the base portion of the back yoke 3.
- the protruding portion 361 c is a plate-like member that constitutes the magnetic pole teeth 31.
- the magnetic pole tooth piece 361 is formed by integrating two plate-like members.
- the magnetic pole tooth unit 37 is formed by laminating a plurality of magnetic pole tooth pieces 371.
- the stacking direction of the magnetic pole tooth pieces 371 is a direction intersecting the arrangement direction of the magnetic pole teeth 31.
- the magnetic pole tooth piece 371 has substantially the same configuration as the magnetic pole tooth piece 361.
- the magnetic pole tooth piece 371 includes a fitted portion 371a, a connecting portion 371b, and a plurality of protruding portions 371c.
- the connection portion 361b of the magnetic pole tooth piece 361 protrudes in the longitudinal direction at one end portion in the longitudinal direction.
- the connecting portion 371b of the magnetic pole tooth piece 371 does not protrude in the longitudinal direction at both ends in the longitudinal direction. Since the other configuration of the magnetic pole tooth piece 371 is the same as that of the magnetic pole tooth piece 361, the description thereof is omitted.
- FIG. 37 is a perspective view showing a configuration example of the base portion 35.
- the base part 35 shown in FIG. 37 is inverted upside down from the base part 35 shown in FIG.
- the base part 35 has a rectangular plate shape.
- the base portion 35 is formed with a fitting groove 35a having a trapezoidal cross section.
- the fitted portion 36a of the magnetic pole tooth unit 36 or the fitted portion 37a of the magnetic pole tooth unit 37 is fitted.
- the length of the movable element 2 in the movable direction may be set according to the length of the magnetic pole tooth unit 36 or the magnetic pole tooth unit 37 in the movable direction.
- the base 35 and the magnetic pole tooth unit 36 or the magnetic pole tooth unit 37 are fixed as follows. After the adhesive is applied to one or both of the fitting groove 35a and the fitted portion 361a or the fitted portion 371a, the fitting is performed. Thereby, the base part 33 and the magnetic pole tooth unit 36 or the magnetic pole tooth unit 37 are fixed.
- the back yoke unit 301 or the back yoke unit 302 is formed. Then, by selecting the number of back yoke units 301 according to the stroke of the linear motor 1 and combining a plurality of back yoke units 301 and one back yoke unit 302, the back yoke 3 can be made as shown in FIG. It is formed.
- the respective back yoke units 301 and 302 may be coupled by a known method, for example, the back surfaces of the back yoke units 301 and 302 may be fixed by a rectangular plate member.
- the magnetic pole tooth units 36 and 37 are configured by laminating silicon steel plates (magnetic pole tooth pieces 361 and 371).
- the linear motor 1 has a laminated structure in a part in the thickness direction from the connection portion with the magnetic pole teeth 31 of the back yoke 3. Therefore, the magnetic flux flowing between the adjacent magnetic pole teeth 31 to the connecting portions 361b and 371b is in a direction parallel to the surfaces of the magnetic pole tooth pieces 361 and 371.
- the direction of the eddy current generated by the flow of the magnetic flux is a direction to penetrate the plate surfaces of the magnetic pole tooth pieces 361 and 371.
- connection portions 361b and 371b are larger than that in the case of not using the laminated structure due to the gap between the surfaces of the magnetic pole teeth 361 and 371 or the oxide film formed on the surface. . Therefore, it is possible to reduce eddy currents flowing through the connection portions 361b and 371b. Therefore, the eddy current flowing through the back yoke 3 can be further reduced.
- the base portion 35 which is a part of the back yoke 3 can be formed of a nonmagnetic material, it can be formed of a material having a high Young's modulus, such as alumina.
- the rigidity of the entire back yoke 3 is increased, it is possible to reduce the bending due to the attractive force generated between the back yoke 3 and the mover 2.
- the rigidity of the back yoke 3 as a whole is higher than the rigidity required for the material of the base portion 35, the back yoke 3 can be made thinner.
- the stroke of the linear motor 1 can be changed by making the number of back yoke units 301 included in the back yoke 3 variable.
- the back yoke units 301 and 302 each have five magnetic pole teeth 31, but the invention is not limited thereto.
- the base portion 33 includes one magnetic pole tooth unit 36 or magnetic pole tooth unit 37, the present invention is not limited thereto.
- the magnetic pole tooth unit 36 and the magnetic pole tooth unit 37 are each provided with the same number of magnetic pole teeth 31, but the present invention is not limited thereto.
- FIG. 38A is a side view showing another configuration example of the back yoke 3.
- the back yoke 3 includes a base portion 33, a plurality of magnetic pole tooth units 36 and a magnetic pole tooth unit 37.
- the configurations of the magnetic pole tooth unit 36 and the magnetic pole tooth unit 37 are the same as those of the second modified example described above, and thus the description thereof is omitted.
- FIG. 38B is a perspective view showing a configuration example of the base portion 33.
- the base part 33 shown in FIG. 38B is upside down with respect to the base part 33 shown in FIG. 38A.
- the base portion 33 is formed with a plurality of dovetail grooves (fitting grooves) 33a in a rectangular plate material.
- the dovetail groove 33 a has a shape corresponding to the fitted portions 36 a and 37 a of the magnetic pole tooth units 36 and 37.
- the back yoke 3 is fixed to the dovetail groove 33a of the base portion 33 with the fitting portions 36a and 37a of the magnetic pole tooth units 36 and 37, and then fixed with an adhesive or the like.
- the base portion 33 is made of a nonmagnetic material.
- the base portion 33 which is a part of the back yoke 3 can be made of a nonmagnetic material having a high Young's modulus, such as alumina. Thereby, since the rigidity of the entire back yoke 3 is increased, it is possible to reduce the bending due to the attractive force generated between the back yoke 3 and the mover 2.
- the gap between the adjacent magnetic pole teeth 31 may be filled with a nonmagnetic material such as a resin mold.
- the base plate 32 in the basic example described above may have a laminated structure in a part opposite to the direction in which the magnetic pole teeth 31 protrude from the root portion of the magnetic pole teeth 31 (thickness direction).
- the magnetic pole teeth 31 (projections 31a and 31a) having a laminated structure may be engaged with the recesses 32a and 32a in the laminated structure portion of the base plate 32 having a partially laminated structure.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Linear Motors (AREA)
Abstract
Description
F=B2 S/2μ0
(但し、B:電極子の磁極歯上の磁束密度、S:可動子と電機
子との対向有効面積、μ0 :真空の透磁率)
図1及び図2は、実施の形態1のリニアモータ1の構成を示す斜視図及び側面図である。図3及び図4は、実施の形態1のリニアモータ1における可動子2の構成例を示す平面図及び分解斜視図である。なお、図1及び図2では、可動子2のみは磁石の配置がわかるように可動方向に平行な方向からの断面を表している。
永久磁石21の材質:Nd-Fe-B系希土類磁石(日立金属製NMX
-S49CH材)
永久磁石21の形状:厚さ5.0mm,幅12mm,長さ82mm
永久磁石21のピッチ:12.96mm
永久磁石21のスキュー角:3.2°
バックヨーク3の形状:厚さ6.0mm,幅90mm,長さ263.04mm
バックヨーク3の材質:軟鋼(JIS規格 G3101 種類記号 SS400材)
磁極歯31の形状:幅6.0mm,高さ:3.0mm,長さ:82mm
磁極歯31のピッチ:15.12mm
コア41の体格:高さ31mm,幅82mm,長さ263.04mm
コア41の材質:珪素鋼板(JIS規格 C2552 種類記号 50A800材)
磁極歯42の形状:幅6.0mm,高さ:25mm,長さ:82mm
磁極歯42のピッチ:15.12mm
駆動コイル43の形状:幅15.12mm,高さ23mm,長さ91.12mm
駆動コイル43の巻き厚:4.06mm
駆動コイル43の巻き線の径,巻き数:直径2mm,17ターン
巻き線抵抗(1個):0.0189Ω
可動子2の質量:516.6g
永久磁石55の材質:Nd-Fe-B系希土類磁石(日立金属製NMX
-S49CH材)
永久磁石55の形状:厚さ5.0mm,幅12mm,長さ82mm
永久磁石55のピッチ:12.96mm
永久磁石55のスキュー角:3.2°
バックヨーク53の形状:厚さ6.0mm,幅90mm,長さ190mm
バックヨーク53の材質:軟鋼(JIS規格 G3101 種類記号 SS400材)
コア56の体格:高さ31mm,幅82mm,長さ263.04mm
コア56の材質:珪素鋼板(JIS規格 C2552 種類記号 50A800材)
磁極歯57の形状:幅6.0mm,高さ:25mm,長さ:82mm
磁極歯57のピッチ:15.12mm
駆動コイル58の形状:幅15.12mm,高さ23mm,長さ91.12mm
駆動コイル58の巻き厚:4.06mm
駆動コイル58の巻き線の径,巻き数:直径2mm,17ターン
巻き線抵抗(1個):0.0189Ω
可動子51(磁石配列52+バックヨーク53)の質量:1321.01g
永久磁石65の材質:Nd-Fe-B系希土類磁石(日立金属製NMX
-S49CH材)
永久磁石65の形状:厚さ5.0mm,幅12mm,長さ82mm
永久磁石65のピッチ:12.96mm
永久磁石65のスキュー角:3.2°
バックヨーク63の形状:厚さ6.0mm,幅90mm,長さ215mm
バックヨーク63の材質:軟鋼(JIS規格 G3101 種類記号 SS400材)
コア66の体格:高さ31mm,幅82mm,長さ263.04mm
コア66の材質:珪素鋼板(JIS規格 C2552 種類記号 50A800材)
磁極歯67の形状:幅6.0mm,高さ:25mm,長さ:82mm
磁極歯67のピッチ:15.12mm
駆動コイル68の形状:幅15.12mm,高さ23mm,長さ91.12mm
駆動コイル68の巻き厚:4.06mm
駆動コイル68の巻き線の径,巻き数:直径2mm,17ターン
巻き線抵抗(1個):0.0189Ω
可動子(磁石配列62)の質量:516.6g
図23及び図24は実施の形態2のリニアモータ1の構成例を示す斜視図及び側面図である。なお、図23及び図24では、可動子2のみは磁石の配置がわかるように可動方向に平行な方向からの断面を表している。
第1変形例は、バックヨーク3を構成するベース板の一部を積層構造とする形態に関する。図30はバックヨーク3の他の構成例を示す側面図である。バックヨーク3はベース部33及び磁極歯ブロック34を含む。磁極歯ブロック34は被嵌合部34a及び複数の磁極歯31を含む。
第2変形例はバックヨーク3を構成するベース板32の一部を積層構造とする形態に関する。図35はバックヨーク3の他の構成例を示す側面図である。バックヨーク3は複数のバックヨークユニット301及びバックヨークユニット302を含む。バックヨークユニット301はベース部35及び磁極歯ユニット36を含む。バックヨークユニット302はベース部35及び磁極歯ユニット37を含む。バックヨークユニット301とバックヨークユニット302との違いは、含まれる磁極歯ユニットの違いである。バックヨーク3の一端部をバックヨークユニット301とし、他端部をバックヨークユニット302とする。それにより、図35に示すように、両端部に磁極歯31を備えるバックヨーク3を構成することが可能となっている。
第3変形例は第2変形例において、ベース部35を一枚板にした構成に関する。図38Aはバックヨーク3の他の構成例を示す側面図である。バックヨーク3はベース部33、複数の磁極歯ユニット36及び磁極歯ユニット37を含む。磁極歯ユニット36及び磁極歯ユニット37の構成は、上述の第2変形例と同様であるから、説明を省略する。
2 可動子
3 バックヨーク
4 電機子
21 永久磁石
22 保持枠
23 固定板
31 磁極歯
32 ベース板
33 ベース部
34 磁極歯ブロック
35 ベース部
36 磁極歯ユニット
37 磁極歯ユニット
41 コア
42 磁極歯
43 駆動コイル
221 孔
301 バックヨークユニット
302 バックヨークユニット
311 磁極片
341 磁極歯片
361 磁極歯片
371 磁極歯片
Claims (9)
- 複数の矩形状の永久磁石を配列させた磁石配列を有する可動子と、前記可動子に隙間をあけて対向配置した固定子としてのバックヨークと、前記可動子に隙間をあけて前記バックヨークとは反対側に対向配置した固定子としての電機子とを備えており、
前記複数の永久磁石夫々の磁化方向は厚さ方向であって、隣り合う永久磁石同士の磁化方向は逆向きであり、
前記電機子は、夫々に駆動コイルが捲かれている複数の磁極歯を等ピッチで有しており、
前記バックヨークは、前記可動子に対向する面に、前記電機子の磁極歯と前記可動子の可動方向にあって同じ位置に複数の磁極歯を有しており、
前記バックヨークにおける磁極歯の磁極面積は、前記電機子における磁極歯の磁極面積の0.9倍~1.1倍であり、前記可動子と前記バックヨークとの隙間は、前記可動子と前記電機子との隙間に等しいかまたは大きい
ことを特徴とするリニアモータ。 - 前記バックヨークにおける前記磁極歯の高さは、該磁極歯のピッチの1/20倍以上2倍以下であることを特徴とする請求項1記載のリニアモータ。
- 前記可動子の長さは、前記電機子の長さよりも短く、前記バックヨークの長さよりも短いことを特徴とする請求項1または2に記載のリニアモータ。
- 前記可動子と前記バックヨークとの隙間の大きさ、及び/または、前記可動子と前記電機子との隙間の大きさは可変であることを特徴とする請求項1から3の何れか1項に記載のリニアモータ。
- 複数の矩形状の永久磁石を配列させた磁石配列を有する可動子と、前記可動子に隙間をあけて対向配置した固定子としてのバックヨークと、前記可動子に隙間をあけて前記バックヨークとは反対側に対向配置した固定子としての電機子とを備えており、
前記複数の永久磁石夫々の磁化方向は厚さ方向であって、隣り合う永久磁石同士の磁化方向は逆向きであり、
前記電機子は、夫々に駆動コイルが捲かれている複数の磁極歯を等ピッチで有しており、
前記バックヨークは、前記可動子に対向する面に、前記電機子の磁極歯と前記可動子の可動方向にあって同じ位置に複数の磁極歯を有しており、
前記バックヨークが有する前記磁極歯は、複数の板状部材を前記可動子の可動方向と交差する方向に積層してなる
ことを特徴とするリニアモータ。 - 前記バックヨークは、前記磁極歯の根元部から前記磁極歯の突出する方向とは逆方向の一部が、複数の板状部材を前記磁極歯の積層方向に積層してなり、
前記バックヨークの積層部分を構成する板状部材と、前記磁極歯を構成する板状部材とは、一体となっている
ことを特徴とする請求項5に記載のリニアモータ。 - 前記複数の板状部材は、積層面に絶縁処理を施してある
ことを特徴とする請求項5または6に記載のリニアモータ。 - 前記可動子は、前記磁石配列を保持する保持部材を有しており、前記保持部材は、前記複数の永久磁石それぞれが挿入される複数の孔を有していることを特徴とする請求項1から7の何れか1項に記載のリニアモータ。
- 前記可動子は、前記保持部材及び前記複数の永久磁石が接着固定される板状のベース材を有することを特徴とする請求項8に記載のリニアモータ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019507014A JP7151698B2 (ja) | 2017-03-24 | 2018-03-23 | リニアモータ |
KR1020197026824A KR102339956B1 (ko) | 2017-03-24 | 2018-03-23 | 리니어 모터 |
CN201880020494.6A CN110476340B (zh) | 2017-03-24 | 2018-03-23 | 直线电动机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017059699 | 2017-03-24 | ||
JP2017-059699 | 2017-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018174235A1 true WO2018174235A1 (ja) | 2018-09-27 |
Family
ID=63585844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/011655 WO2018174235A1 (ja) | 2017-03-24 | 2018-03-23 | リニアモータ |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP7151698B2 (ja) |
KR (1) | KR102339956B1 (ja) |
CN (1) | CN110476340B (ja) |
TW (1) | TWI664795B (ja) |
WO (1) | WO2018174235A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021124426A1 (ja) * | 2019-12-17 | 2021-06-24 | ヤマハ発動機株式会社 | リニアコンベアおよびそのリニアコンベアの設置方法 |
WO2022118761A1 (ja) * | 2020-12-01 | 2022-06-09 | 株式会社神戸製鋼所 | 磁場発生装置及びこれを備えた電動機 |
DE102022000363A1 (de) | 2022-01-31 | 2023-08-03 | Roland Burk | Mehrkammer-Sorptionsmodul für große Temperaturspreizung und Betriebsverfahren desselben |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN213461501U (zh) * | 2020-09-04 | 2021-06-15 | 瑞声科技(南京)有限公司 | 直线电机 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63249460A (ja) * | 1987-04-06 | 1988-10-17 | Hitachi Ltd | 永久磁石機 |
JPH0295162A (ja) * | 1988-09-27 | 1990-04-05 | Matsushita Electric Works Ltd | リニアステップモータ |
JPH10290560A (ja) * | 1997-04-11 | 1998-10-27 | Yaskawa Electric Corp | 可動磁石形リニアモータ |
JP2015119531A (ja) * | 2013-12-17 | 2015-06-25 | ファナック株式会社 | リニアモータを備えた直線駆動装置を有する工作機械 |
JP2016073005A (ja) * | 2014-09-26 | 2016-05-09 | 日立金属株式会社 | リニアモータ用固定子 |
JP2018050430A (ja) * | 2016-09-23 | 2018-03-29 | 日立金属株式会社 | リニアモータ |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4198582A (en) * | 1977-06-24 | 1980-04-15 | Exxon Research & Engineering Co. | High performance stepper motor |
US5032746A (en) * | 1988-03-22 | 1991-07-16 | Sharp Kabushiki Kaisha | Linear motor with driving device |
JP4535231B2 (ja) | 2003-10-10 | 2010-09-01 | 株式会社安川電機 | 可動磁石形リニアアクチュエータ |
JP2005184984A (ja) | 2003-12-19 | 2005-07-07 | Yaskawa Electric Corp | ムービングマグネット形リニアアクチュエータ |
JP2005269822A (ja) | 2004-03-19 | 2005-09-29 | Yaskawa Electric Corp | ムービングマグネット形リニアスライダ |
JP4537745B2 (ja) * | 2004-03-30 | 2010-09-08 | 株式会社日立製作所 | リニアモータ |
CN100521468C (zh) * | 2004-08-20 | 2009-07-29 | 清华大学 | 永磁同步平面电动机 |
JP4640375B2 (ja) * | 2007-05-15 | 2011-03-02 | セイコーエプソン株式会社 | 電動機 |
DE102009044528A1 (de) * | 2008-11-14 | 2010-06-02 | Denso Corporation, Kariya-City | Reluktanzmotor |
TWI460966B (zh) * | 2009-01-23 | 2014-11-11 | Hitachi Metals Ltd | Moving elements and linear motors |
DE112011100996T5 (de) * | 2010-03-23 | 2013-01-24 | Hitachi Metals, Ltd. | Linearmotor |
WO2011155022A1 (ja) * | 2010-06-08 | 2011-12-15 | 株式会社日立製作所 | リニアモータ |
CN102299607B (zh) * | 2011-08-25 | 2013-02-13 | 哈尔滨工业大学 | 永磁偏置型横向磁通直线磁阻电机 |
CN102403872B (zh) * | 2011-11-04 | 2013-05-08 | 哈尔滨工业大学 | 定位力补偿型直线永磁同步电机 |
CN202455246U (zh) * | 2012-02-23 | 2012-09-26 | 南京埃斯顿自动控制技术有限公司 | 一种内置式永磁同步直线电机次级结构 |
WO2014047104A1 (en) * | 2012-09-20 | 2014-03-27 | Magnemotion, Inc. | Short block linear synchronous motors and switching mechanisms |
KR20150127748A (ko) * | 2013-04-12 | 2015-11-17 | 미쓰비시덴키 가부시키가이샤 | 가동자 및 리니어 모터 |
JP5991286B2 (ja) * | 2013-08-28 | 2016-09-14 | 株式会社安川電機 | リニアモータの電機子及びリニアモータ |
DE102013019958B4 (de) * | 2013-12-09 | 2024-06-27 | Jenny Science Ag | Linearmotor mit optimierter Leistung |
JP6115729B2 (ja) | 2014-01-08 | 2017-04-19 | 株式会社安川電機 | リニアモータ及びリニアモータの製造方法 |
JP2016152668A (ja) * | 2015-02-17 | 2016-08-22 | 住友重機械工業株式会社 | リニアモータ、磁石ユニット、ステージ装置 |
TWI612753B (zh) | 2015-03-31 | 2018-01-21 | 日立金屬股份有限公司 | 線性馬達 |
CN204858933U (zh) * | 2015-07-01 | 2015-12-09 | 深圳德康威尔科技有限公司 | 一种c型无铁芯直线电机 |
CN105119463A (zh) * | 2015-07-22 | 2015-12-02 | 北京顿一科技有限公司 | 新型有铁芯直线电机、电机伺服***及铁芯的制备方法 |
CN105871171B (zh) * | 2016-04-08 | 2018-06-01 | 浙江大学 | 一种变磁通直线同步电动机 |
-
2018
- 2018-03-22 TW TW107109829A patent/TWI664795B/zh active
- 2018-03-23 CN CN201880020494.6A patent/CN110476340B/zh active Active
- 2018-03-23 WO PCT/JP2018/011655 patent/WO2018174235A1/ja active Application Filing
- 2018-03-23 JP JP2019507014A patent/JP7151698B2/ja active Active
- 2018-03-23 KR KR1020197026824A patent/KR102339956B1/ko active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63249460A (ja) * | 1987-04-06 | 1988-10-17 | Hitachi Ltd | 永久磁石機 |
JPH0295162A (ja) * | 1988-09-27 | 1990-04-05 | Matsushita Electric Works Ltd | リニアステップモータ |
JPH10290560A (ja) * | 1997-04-11 | 1998-10-27 | Yaskawa Electric Corp | 可動磁石形リニアモータ |
JP2015119531A (ja) * | 2013-12-17 | 2015-06-25 | ファナック株式会社 | リニアモータを備えた直線駆動装置を有する工作機械 |
JP2016073005A (ja) * | 2014-09-26 | 2016-05-09 | 日立金属株式会社 | リニアモータ用固定子 |
JP2018050430A (ja) * | 2016-09-23 | 2018-03-29 | 日立金属株式会社 | リニアモータ |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021124426A1 (ja) * | 2019-12-17 | 2021-06-24 | ヤマハ発動機株式会社 | リニアコンベアおよびそのリニアコンベアの設置方法 |
WO2022118761A1 (ja) * | 2020-12-01 | 2022-06-09 | 株式会社神戸製鋼所 | 磁場発生装置及びこれを備えた電動機 |
DE102022000363A1 (de) | 2022-01-31 | 2023-08-03 | Roland Burk | Mehrkammer-Sorptionsmodul für große Temperaturspreizung und Betriebsverfahren desselben |
Also Published As
Publication number | Publication date |
---|---|
TW201840105A (zh) | 2018-11-01 |
TWI664795B (zh) | 2019-07-01 |
KR102339956B1 (ko) | 2021-12-16 |
CN110476340B (zh) | 2021-07-06 |
KR20190112153A (ko) | 2019-10-02 |
JP7151698B2 (ja) | 2022-10-12 |
JPWO2018174235A1 (ja) | 2020-01-23 |
CN110476340A (zh) | 2019-11-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5370313B2 (ja) | リニアモータ | |
WO2018174235A1 (ja) | リニアモータ | |
US7456528B2 (en) | High performance linear motor and magnet assembly therefor | |
JP5253114B2 (ja) | リニアモータ | |
JP4458238B2 (ja) | 永久磁石型同期リニアモータ | |
WO2001080408A1 (fr) | Moteur lineaire synchrone a aimants permanents | |
US20090256428A1 (en) | Linear Motor with Force Ripple Compensation | |
WO2005060076A1 (ja) | リニアモータおよび吸引力相殺形リニアモータ | |
EP0959549B1 (en) | Brushless permanent magnet electric motor | |
US8164223B2 (en) | Linear motor mounting structure | |
JP2004364374A (ja) | リニアモータ | |
JP2011067030A (ja) | リニアモータの界磁およびそれを備えたリニアモータ | |
JP2002209371A (ja) | リニアモータ | |
JP6790656B2 (ja) | リニアモータ | |
JP2003244930A (ja) | 駆動装置 | |
JP4110335B2 (ja) | リニアモータ | |
JP3944766B2 (ja) | 永久磁石形同期リニアモータ | |
JP2006527576A (ja) | ディテント力を弱めた鉄心を備えたリニアブラシレスdcモータ | |
JP3824060B2 (ja) | リニアモータ | |
JP5460991B2 (ja) | リニアモータの固定子 | |
JP2002095232A (ja) | リニアモータの電機子構造 | |
KR20080058572A (ko) | 횡자속 선형전동기 | |
CN118264069A (zh) | 励磁、电动机、发电机以及励磁的制造方法 | |
JP2013021819A (ja) | リニアモータの固定子 | |
JP2005229778A (ja) | リニアモータ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18771832 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2019507014 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20197026824 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 18771832 Country of ref document: EP Kind code of ref document: A1 |