JP2013051812A - Linear driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology regarding a linear driving device which inhibits the saturation of the flux density and enables the efficient use of magnetic energy while realizing the downsizing of the linear driving device.SOLUTION: A stator core 11 of a linear driving device 100 has stator teeth members 114 to which coils 13 and 14 are respectively attached and a yoke member 113 connecting the stator teeth members 114. The yoke member 113 has a protruding part 113b. The protruding part 113b is disposed between the stator teeth members 114 and thereby ensuring a desired magnetic path cross section area. As a result, the structure inhibits the saturation of the flux density and enables the efficient use of magnetic energy while realizing the downsizing of the linear driving device.

Description

  The present invention relates to a linear drive device that performs linear drive by electromagnetic action.

  In the linear motor described in Patent Document 1, the primary stator is housed in a regular octagonal bottomed stator housing case. The stator is divided into an outer yoke, an inner yoke, a bottom yoke, and a front yoke, and these are accommodated in a case. A stator coil is disposed between the outer peripheral yoke and the inner peripheral yoke of the stator, and a movable holder for holding the permanent magnet and the movable shaft is disposed between the stator coil and the inner peripheral yoke. (For example, refer to the paragraph [0014] in FIG. 1 of the specification of Patent Document 1).

  Since the stator is thus divided into the outer peripheral yoke, the inner peripheral yoke, the bottom yoke, and the front yoke, various shapes of yokes can be efficiently accommodated in the case.

  On the other hand, the linear actuator described in Patent Document 2 is formed by arranging a T-shaped stator component member divided into a plurality of pieces in the circumferential direction and having permanent magnets attached thereto, and the stator component members arranged. And a cylindrical mover disposed in the central space (see, for example, paragraph [0019] of FIG. 1 and FIG. 1).

  In the devices of Patent Documents 1 and 2 and other devices that perform general linear driving, the stator core is disposed around the entire core of the mover as described above with the axis of the mover as the center. In such a structure, since the coils (a large number of coils in Patent Document 2) are arranged around the entire periphery of the mover, the thrust of the mover can be increased. However, there is a problem that the volume of the core used for the primary side mechanism (here, the mechanism having the coil) becomes large and the apparatus becomes large. Therefore, in an environment where a very high thrust is not required, it is conceivable to reduce the volume of the core of the primary side mechanism, for example, in order to reduce the size of the entire apparatus.

JP 2000-236653 A JP 2001-28871 A

  However, if the volume of the core is simply reduced, the magnetic flux density passing through the core becomes too high and may be saturated immediately. In other words, this makes it impossible to use magnetic energy efficiently. Therefore, when designing a small linear drive device, it is necessary to design a magnetic path cross-sectional area corresponding to the generated magnetic flux, and it is desired to effectively use magnetic energy without waste.

  In view of the circumstances as described above, an object of the present invention is to provide a technology related to a linear drive device that can efficiently use magnetic energy by suppressing saturation of magnetic flux density while realizing miniaturization of the linear drive device. There is to do.

In order to achieve the above object, a linear drive device according to an aspect of the present invention includes:
A mover having a mover core and a permanent magnet provided on the mover core;
A plurality of teeth members, each having a surface facing the mover core with a predetermined gap, wherein a plurality of coils can be mounted on each of the mover cores, and are arranged at predetermined intervals in the moving direction of the mover;
A yoke member having a convex portion and connecting the plurality of teeth members;
Of the plurality of teeth members, the surface opposite to the surface facing the mover core and the surface of the yoke member face each other, and the convex portion is disposed between the plurality of teeth members. It is characterized by being.

  When this linear drive device is used as a device for obtaining a driving force, the linear drive device operates as follows. When a current is applied to each coil, a magnetic flux is generated in the tooth member and the yoke member constituting the stator. The mover moves due to the interaction between the magnetic flux generated by the magnetic pole of the permanent magnet provided in the mover core and the magnetic flux generated in the stator.

  When this linear drive device is used as a generator, the mover is driven from the outside, and the mover moves to generate magnetic flux in the teeth member and the yoke member constituting the stator, thereby causing an electromotive force in the coil. Occurs.

  In the present invention, among the plurality of tooth members, a yoke member having a convex portion is connected to a surface provided on the side opposite to the surface facing the mover core, whereby the tooth members are coupled to each other. . Thus, by providing a convex part in a yoke member, the magnetic path cross-sectional area in a yoke member can be enlarged. For example, when designing a small linear drive device, a designer reduces the volume of the stator core on the side opposite to the side where the mover core is disposed, that is, the outer peripheral side of the linear drive device. The convex part which is a core with a volume corresponding to the volume is designed so as to fit between the arranged teeth members. Thereby, the size of the stator can be reduced while ensuring a desired magnetic path cross-sectional area. That is, it is possible to efficiently use the magnetic energy while suppressing the saturation of the magnetic flux density while realizing the miniaturization of the linear drive device.

The yoke member has a surface connected to the plurality of tooth members,
The convex portion is provided so as to protrude from the surface of the yoke member, is in contact with the plurality of tooth members on the surface, and a gap is provided between the plurality of tooth members at a position away from the surface. May be formed.

  In the present invention, the convex portion contacts the plurality of teeth members on the surface of the yoke member. In addition, since a gap is formed between the convex portion and the tooth member at a position away from the surface, the magnetic flux generated from the tooth member does not directly pass through the convex portion. Generation of eddy currents in the section can be suppressed.

  The linear drive device may further include a housing having an opening, an opening end surface provided around the opening to form the opening, and a positioning protrusion protruding from the opening end surface. The plurality of tooth members have contact protrusions, and the contact protrusions are in contact with the opening end surface of the housing and the positioning protrusions, and are inserted into the housing through the openings. Thus, the plurality of teeth members may be supported by the housing such that the plurality of coils are arranged in the housing.

  Thus, the positioning protrusion is provided on the housing, and the contact protrusion provided on the tooth member comes into contact with the positioning protrusion and is inserted into the housing, so that the tooth member is positioned and supported by the housing. Is done. That is, at the time of assembling the linear drive device, the operator can easily position the plurality of tooth members with respect to the housing with a simple configuration because of the positioning protrusion and the contact protrusion.

A linear drive device according to another aspect of the present invention is:
The stator is
A stator core,
A permanent magnet provided on the stator core;
The mover is
A plurality of teeth members having faces facing the stator core while maintaining a predetermined gap, a plurality of coils being mountable, and a plurality of teeth members arranged at predetermined intervals in the moving direction of the mover;
A yoke member having a convex portion and connecting the plurality of teeth members;
Of the plurality of tooth members, the surface opposite to the surface facing the stator core and the surface of the yoke member face each other, and the convex portion is disposed between the plurality of tooth members. It is characterized by.

  In the present invention, the tooth members are connected to each other by connecting the yoke member having the convex portion to the surface of the plurality of tooth members provided on the side opposite to the facing surface facing the stator core. . Thus, by providing a convex part in a yoke member, the magnetic path cross-sectional area in a yoke member can be enlarged. For example, when designing a small linear drive device, the designer reduced the volume of the mover core on the side opposite to the side where the stator core is arranged, that is, the outer peripheral side of the linear drive device. The convex part which is a core of a minute volume is designed so as to fit between the arranged tooth members. Thereby, the size of the stator can be reduced while ensuring a desired magnetic path cross-sectional area. That is, it is possible to efficiently use the magnetic energy while suppressing the saturation of the magnetic flux density while realizing the miniaturization of the linear drive device.

  As described above, according to the present invention, it is possible to efficiently use magnetic energy while suppressing the saturation of the magnetic flux density while realizing miniaturization of the linear drive device.

FIG. 1 is a front view showing a linear drive device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a plan view of this linear drive device (viewed in the Y-axis direction in FIG. 2). FIG. 4 is an exploded perspective view of a part of the linear drive device. FIG. 5 is a side view showing the stator core with a solid line. 6A and 6B are diagrams sequentially illustrating the operation of the linear drive device. FIG. 7 shows the stator core shown in FIG. 6A and is a diagram for explaining a magnetic path. FIG. 8 is a view for explaining another embodiment of the yoke member. FIG. 9 is a view for explaining still another embodiment of the yoke member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Configuration of linear drive unit]
FIG. 1 is a front view showing a linear drive device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a plan view of this linear drive device (viewed in the Y-axis direction in FIG. 2).

  The linear drive device 100 includes a stator 1 and a generally cylindrical movable element 3. The stator 1 and the mover 3 are positioned relative to each other and supported by the housing 2. FIG. 1 is a diagram viewed in the moving direction (Z-axis direction) of the mover 3. The stator 1 has stator cores 11 and 12.

  FIG. 4 is an exploded perspective view of a part of the linear drive device 100. Here, of the stator cores 11 and 12, the stator core 11 is shown, and the illustration of the stator core 12 having substantially the same configuration as this is omitted. The stator core 11 includes a plurality of stator teeth members 114 and a yoke member 113 that connects these stator teeth members 114.

  As shown in FIGS. 1 and 2, two stator teeth members 114 are arranged, for example, along the Z-axis direction, and two are arranged along the Y-axis direction, for a total of four. .

FIG. 5 is a side view showing the stator cores 11 and 12 by solid lines. In FIG. 5, members other than the stator teeth member 114 and the yoke member 113 are shown by chain lines. As shown in FIGS. 1, 2, 4 and 5, the stator teeth member 114 has an opposing surface 114a facing a movable element core 31 (to be described later) of the movable element 3 with a predetermined gap, and the opposing surface 114a is Y. It has a connection surface 114b provided on the opposite side in the axial direction and magnetically connected to the yoke member 113. A part of the outer surface of the stator tooth member 114 becomes a connection surface 114b, and this connection surface 114b is indicated by hatching in FIG. In this embodiment, the yoke member 113 and the stator tooth member 114 are made of a ferromagnetic material, and are magnetically connected by mechanically (physically) connecting them.
The predetermined gap is, for example, 0.1 to 1 mm. However, the design of this range can be changed as appropriate according to the size of the mover and the stator, the desired thrust characteristics, and the like.
The yoke member 113 and the connection surface 114b of the stator tooth member may be magnetically connected, such as by sandwiching another magnetic body between them, even if they are not directly connected.

  The facing surface 114a has a curved shape. Typically, the shape of the facing surface 114a is a shape corresponding to the side surface of the mover core 31, and is formed in a part of the side surface of the cylinder.

  In addition, the stator tooth member 114 has a contact protrusion 112 that contacts the housing 2 and is provided so as to protrude in both directions along the X axis. The upper surfaces of the contact protrusions 112 are substantially flush with the connection surface 114b described above.

  Coil 13 (14-16) is attached to stator tooth member 114 via an electrical insulator such as a coil bobbin (not shown). Specifically, the coil 13 (14 to 16) (the electrical insulator on which the coil 13 is wound) is attached to the stator tooth member 114 so as to contact the contact protrusion 112.

  The yoke member 113 has a flat plate portion 113a and a convex portion 113b formed so as to protrude from the flat plate portion 113a toward the mover core 31 side. As shown in FIGS. 2 and 4, the convex portion 113 b is disposed in a region between the stator teeth members 114 arranged in the Z-axis direction. In the present embodiment, the front surface and the rear surface of the convex portion 113b facing each other in the Z-axis direction are in magnetic (mechanical) contact with each stator tooth member 114, and a magnetic path can be formed in the convex portion 113b. It is said that.

  The stator teeth member 114 and the yoke member 113 are each made of a ferromagnetic material. These members may be configured by laminating magnetic material plates, for example. The stator tooth member 114 and the yoke member 113 are connected by welding, an adhesive, or the like.

  The housing 2 is made of a nonmagnetic material such as stainless steel or aluminum. As shown in FIG. 4, the housing 2 has an opening 23 facing in the Y-axis direction, and has a cylindrical and rectangular parallelepiped monocoque shape. The housing 2 has an opening end face 25 provided around the opening 23 to form the opening 23, and a positioning protrusion 26 protruding from the opening end face 25 in the Y-axis direction. The positioning protrusion 26 is a protrusion for positioning the stator cores 11 and 12, and includes a wall portion 262 and a protruding portion 261 provided at a substantially central position of the wall portion 262. Two positioning protrusions 26 are provided so as to face each other in the X-axis direction. As described above, since the two openings 23 are provided to face each other in the Y-axis direction, the positioning projection 26 is provided for each of these openings 23.

  As shown in FIGS. 3 and 4, the contact protrusion 112 protruding in the X-axis direction of the stator tooth member 114 is in contact with the opening end surface 25 of the housing 2. In a state where these contact protrusions 112 are in contact with the opening end surface 25, the stator teeth member 114 is inserted into the housing 2 from the facing surface 114a side through the opening 23 as shown in FIGS. Thus, the coils 13 (14 to 16) are arranged in the housing 2. Further, as shown in FIGS. 3 and 4, the contact protrusion 112 is positioned on the positioning protrusion 26 of the housing 2 in a state where the contact protrusion 112 is in contact with the opening end face 25. More specifically, the right-angled portion of the contact protrusion 112 is positioned by contacting the right-angled portion formed by the wall portion 262 and the protrusion 261 of the positioning protrusion 26.

  Thus, since the positioning protrusion 26 is formed in advance in the housing 2 for positioning the stator tooth member 114, the stator core 11 (and 12) can be positioned in the housing 2 with a simple configuration.

  As shown in FIGS. 1 and 4, a screw hole 114 d formed in the Z-axis direction is formed in the contact protrusion 112 of the stator tooth member 114, and the screw hole is also formed in the protrusion 261 of the positioning protrusion 26. 261a is formed. With the stator tooth member 114 positioned as described above, the bolt B (see FIG. 3) is screwed into the screw holes 114d and 261a to fasten the stator tooth member 114 and the positioning protrusion 26. The stator core 11 is supported and fixed to the housing 2. As the stator cores 11 and 12 are supported by the housing 2 in this manner, adjacent stator tooth members 114 are arranged at a predetermined interval in the Z-axis direction, and in the Y-axis direction, the stator core 11 is arranged. And 12 are arranged so as to face each other with the mover 3 interposed therebetween.

  Thus, since the longitudinal direction of the bolt B is provided along the moving direction of the mover 3, the rigidity of the housing 2 and the stator 1 in the moving direction of the mover 3 can be increased. Therefore, the desired movement of the mover 3 can be ensured and the thrust characteristics can be improved.

  A circular hole 21a in which a shaft 33 of the mover 3 to be described later appears and is formed in the pair of side walls 21 facing each other in the movement direction of the mover 3 in the Z-axis direction. The hole 21 a is a hole into which the mover core 31 of the mover 3 is inserted when the linear drive device 100 is assembled.

  As shown in FIGS. 1 to 3, the mover 3 includes a mover core 31 and permanent magnets 321, 322, 323, 341, 342 and 343 embedded in the mover core 31 as shown in FIG. 2. . As described above, the mover core 31 is disposed to face the facing surface 114 a of the stator tooth member 114. The mover core 31 may be composed of a plurality of magnetic material plates (for example, laminated steel plates) stacked in the moving direction (Z-axis direction) of the mover 3 in order to suppress eddy currents.

  As shown in FIG. 2, an insertion hole 31 c of the shaft 33 penetrating along the Z-axis direction is formed at the center of the mover 3. The shaft 33 is supported by a support member such as a bearing or a spring (not shown) so that the shaft 33 can move along the Z-axis direction.

  When the linear drive device 100 is used as a linear actuator, a spring member is used as a support member that supports the shaft 33. Typically, a spiral leaf spring is used as the spring member. Such a leaf spring elastically connects the shaft 33 and the housing 2. Other examples of the support member include an 8-shaped leaf spring, a linear bush, a ball spline, an air bearing, and a linear guide.

  After the mover 3 is positioned with respect to the housing 2 by a jig (not shown), the shaft 33 is supported by the support member. After the mover 3 is positioned and supported with respect to the housing 2, the jig is removed from the housing 2. Thereafter, the stator cores 11 and 12 are positioned as described above and fixed to the housing 2.

  Alternatively, after the stator cores 11 and 12 are fixed to the housing 2, the mover 3 may be inserted and positioned and supported through the hole 21 a of the housing 2.

  As shown in FIG. 1, the mover core 31 is provided with a plurality of embedded holes 31 a that are long in the Z-axis direction for embedding the permanent magnet 321 and the like around the shaft 33. Four embedded holes 31 a are provided on the side close to the stator core 11, and four are similarly provided on the side close to the stator core 12. As shown in FIG. 2, the three permanent magnets 321, 322, and 323 (hereinafter referred to as the permanent magnet set 32) are disposed in one embedded hole 31a.

  As shown in FIG. 2, the permanent magnet set 32 is magnetized so that magnetic poles appearing on the surface side (stator core 11 or 12 side) of those permanent magnets are alternately different in the Z-axis direction. That is, each permanent magnet 321 and the like are magnetized in the radial direction of the mover core 31 with the Z-axis direction as the center as viewed in FIG.

  In FIG. 2, the magnetic poles (N, S, N) of the permanent magnet set 32 on the stator core 11 side indicate the magnetic poles appearing on the stator core 11 side. Similarly, the magnetic poles (S, N, S) of the permanent magnet set 32 on the stator core 12 side indicate magnetic poles appearing on the stator core 12 side. The length in the Z-axis direction (and the number of permanent magnets arranged along the Z-axis direction) and the arrangement of each permanent magnet 321 etc. are the length, the number, the arrangement in the Z-axis direction of the stator teeth member 114 etc. It is appropriately set depending on the stroke length of the mover 3 and the like.

  A flat portion 319 is provided on a part of the outer peripheral surface of the mover core 31. The flat portion 34 is disposed at a position not facing the stator teeth member 114. By forming such a flat portion 34 on the mover core 31, the circular shape is notched in the flat portion 34 as compared with a case where the outer shape of the mover core 31 is circular when viewed in the Z-axis direction. Therefore, weight reduction of the needle | mover 3 is realizable. Further, by providing the flat portion 34, the movable element 3 can be positioned with high accuracy when the linear drive device 100 is assembled, as will be described later.

[Operation of linear drive unit]
Next, the operation of the linear drive device 100 configured as described above will be described. 6A and 6B are diagrams for explaining the operation. The polarities of the permanent magnet set 32 of the mover 3 shown in FIGS. 6A and 6B indicate the magnetic poles facing the stator cores 11 and 12 side.

  As shown in FIG. 6A, currents in opposite directions are applied to the two coils 13 and 14 on the stator core 11 side at the same timing, and the two coils 15 and 16 on the stator core 12 side are in opposite directions. Are applied at the same timing. Currents in opposite directions are also applied to the coils 13 (14) and 15 (16) disposed at the same position in the Y-axis direction. Then, magnetic flux is generated in the stator tooth member 114, and magnetic poles are generated as shown in the figure. The mover 3 moves to the right in FIG. 6A due to the interaction between the magnetic flux generated in each stator tooth member 114 and the magnetic flux generated by the permanent magnet 321 or the like provided in the mover 3.

  As shown in FIG. 6B, currents in directions opposite to the directions of the currents shown in FIG. 6A are applied to the coils 13 to 16 at the same timing. Then, the magnetic poles opposite to the magnetic poles shown in FIG. 6A are generated on the stator teeth member 114, respectively. Thereby, the needle | mover 3 moves to the left in FIG. 6B.

  FIG. 7 shows the stator core 11 shown in FIG. 6A and is a diagram for explaining a magnetic path. As shown in this figure, the magnetic flux is also formed on the convex portion 113 b of the yoke member 113. That is, the convex 113b is also a part of the magnetic path, and the magnetic path cross-sectional area of the yoke member 113 can be increased as compared with the case where the convex 113b is not provided.

  Here, the linear drive device 100 is accommodated in, for example, a cylindrical external housing (not shown). In FIG. 5, a circumscribed circle C of the linear drive device 100 indicates the inner diameter of the outer housing. The smaller the size of the linear drive device 100, the smaller the radius R of the circumscribed circle C, and the size of the device to which the linear drive device 100 is applied can be reduced.

  In designing the small linear drive device by reducing the radius R of the circumscribed circle C, the inventor reduces the volume on the outer peripheral side of the stator core 11 (and 12), and the core of the reduced volume It is considered that the protrusion 113b of the yoke member 113 is arranged in a region formed between the arranged stator teeth members 114. Thereby, in realizing the miniaturization of the linear drive device 100, the size of the stator core 11 (and 12) is reduced while ensuring a desired magnetic path cross-sectional area, not simply reducing the volume of the stator core. Can be small. That is, the magnetic energy can be efficiently used while suppressing the saturation of the magnetic flux density while realizing the miniaturization of the linear drive device 100.

[Other Embodiments of Yoke Member]
FIG. 8 is a view for explaining another embodiment of the yoke member.

  As shown in FIG. 8, the convex portion 53b of the yoke member 53 is provided so as to protrude from the back surface 531 of the flat plate portion 53a (the surface of the yoke member 53 connected to the connection surface 114b of the stator tooth member 114). The stator teeth member 114 is in contact with the back surface 531 and a gap u is formed between the stator teeth member 114 and the back surface 531. Typically, the convex portion 53b is formed in a trapezoidal shape when viewed in the X-axis direction.

  By forming such a convex portion 53b, the magnetic path cross-sectional area increases, so that saturation of magnetic flux can be suppressed.

  Further, by providing the gap u, the magnetic flux generated from the stator tooth member 114 does not directly pass through the convex portion 53b, and the generation of eddy current in the convex portion 53b can be suppressed. When the stator tooth member 114 is formed as a solid or is formed of magnetic plates stacked in the Z-axis direction, the generation of eddy current can be suppressed, which is very effective.

[Other embodiments]
The embodiment according to the present invention is not limited to the embodiment described above, and other various embodiments are realized.

  In the said embodiment, the primary side mechanism which has a coil was made into the stator, and the secondary side mechanism was made into the needle | mover. However, the primary side mechanism having a coil may be a mover and the secondary side mechanism may be a stator. In that case, the stator that is the secondary side mechanism is fixed to the housing, and the mover that is the primary side mechanism is provided movably with respect to the housing by a bearing, a spring, or the like.

  The shape of the convex portion is not limited to a rectangle or a trapezoid when viewed in the X-axis direction in each figure, and may be a shape such as a part of a circle or a part of an ellipse.

  The step of attaching the yoke member 113 to the stator tooth member 114 is typically after the step of fixing the stator tooth member 114 to the housing 2. However, the yoke member 113 may be fixed to the stator tooth member 114 before the step of fixing the stator tooth member 114 to the housing 2.

  In the above embodiment, the housing 2 has a rectangular parallelepiped cylinder shape. However, the housing may have a cylindrical shape, an elliptical cylindrical shape, or a square cylindrical shape other than a square as long as it has an opening, an opening end face, and a positioning projection for positioning and supporting the stator core. .

  The number of the permanent magnet sets 32 such as the stator teeth member 114 and the permanent magnets 321 can be appropriately changed. Each shape of a permanent magnet, a stator core, and a mover core can be changed as appropriate. Although the number of magnetic poles or the number of permanent magnets in the moving direction of the mover 3 is three in the above embodiment, it may be one, or may be four or more.

For example, as shown in FIG. 9A, the outer peripheral portion may be formed in a step shape so that as many portions as possible of the outer peripheral portion of the yoke 213 are in contact with the circumscribed circle C (see also FIG. 5).
Alternatively, as shown in FIG. 9B, the width of the yoke 313 in the X-axis direction may be made larger than that of the yoke 213 shown in FIG. 9A, and the yoke 313 may be formed stepwise.
Alternatively, the yoke can have a combination of the yokes 213 and 313 shown in FIGS. 9A and 9B.
Further, as shown in FIG. 9C, the yoke 413 may have, for example, a partial shape of a cylindrical side surface so as to fill a gap inside the circumscribed circle C.
Alternatively, a combined shape of the yoke 413 shown in FIG. 9C and the yoke 213 (or yoke 313) shown in FIG. 9A can also be realized.
By providing the yokes 213, 313, and 413 having these shapes, magnetic saturation can be relaxed while ensuring the yoke area in the Z-axis direction, that is, the magnetic path cross-sectional area to the maximum.
In the present embodiment, since the yoke and the stator tooth member 114 are separate members, various yoke shapes in which such magnetic saturation is suppressed can be realized.

  The shape of the stator teeth member may be any shape as long as it has surfaces facing or facing each of the mover core and the yoke member. For example, those surfaces may be formed in a flat surface or a curved surface. When they are curved surfaces, for example, they may be R-shaped or elliptical arc-shaped.

u ... gap 1 ... stator 2 ... housing 3 ... mover 11, 12 ... stator core 13-16 ... coil 23 ... opening 25 ... opening end face 26 ... projection 31 ... mover core 31c ... insertion hole 31a ... buried hole 53 , 113 ... Yoke members 53b, 113b ... Projections 53a, 113a ... Flat plate portion 100 ... Linear drive device 112 ... Abutting projection 114 ... Stator tooth member (corresponding to a tooth member)
114a ... opposing surface 114b ... connection surface 114d ... screw holes 321-323 ... permanent magnet 531 ... back surface (corresponding to the surface of the yoke member)

Claims (4)

A mover having a mover core and a permanent magnet provided on the mover core;
A plurality of teeth members, each having a surface facing the mover core with a predetermined gap, wherein a plurality of coils can be mounted on each of the mover cores, and are arranged at predetermined intervals in the moving direction of the mover;
A yoke member having a convex portion and connecting the plurality of teeth members;
Of the plurality of teeth members, the surface opposite to the surface facing the mover core and the surface of the yoke member face each other, and the convex portion is disposed between the plurality of teeth members. A linear drive device characterized by that. The linear drive device according to claim 1,
The yoke member has a surface connected to the plurality of tooth members,
The convex portion is provided so as to protrude from the surface of the yoke member, is in contact with the plurality of tooth members on the surface, and a gap is provided between the plurality of tooth members at a position away from the surface. A linear drive device characterized in that the linear drive device is formed. The linear drive device according to claim 1 or 2,
A housing having an opening, an opening end surface provided around the opening to form the opening, and a positioning protrusion protruding from the opening end surface;
The plurality of teeth members have contact protrusions, and the contact protrusions are in contact with the opening end surface of the housing and the positioning protrusions, and are inserted into the housing through the openings. The linear drive device is characterized in that the plurality of teeth members are supported by the housing such that the plurality of coils are arranged in the housing. A linear drive device comprising a stator and a movable element movable with respect to the stator,
The stator is
A stator core,
A permanent magnet provided on the stator core;
The mover is
A plurality of teeth members having faces facing the stator core while maintaining a predetermined gap, a plurality of coils being mountable, and a plurality of teeth members arranged at predetermined intervals in the moving direction of the mover;
A yoke member having a convex portion and connecting the plurality of teeth members;
Of the plurality of tooth members, the surface opposite to the surface facing the stator core and the surface of the yoke member face each other, and the convex portion is disposed between the plurality of tooth members. A linear drive device characterized by that.

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