JP4092349B2 - Linear motor - Google Patents

Description

  The present invention relates to a linear motor particularly used for table feed of a machine tool.

FIG. 20 is a cross-sectional view showing the configuration of this type of conventional linear motor disclosed in Patent Document 1, for example.
In the figure, a stator 1 is configured such that a plurality of permanent magnets 3a and 3b having different polarities are arranged on a stator yoke 2 alternately at a predetermined interval. The mover 4 moves along the stator 1 through a predetermined gap.

  The movable element 4 includes a movable element yoke 5 and a coupling member having a trapezoidal cross section that is held on a surface of the movable element yoke 5 facing the stator 1 with a bolt screw 6 at a predetermined interval. 7. A plurality of first magnetic poles each having a substantially T-shaped cross section and coupled to the coupling member 7 via a dovetail groove 8a formed at the center of one end, and having concave portions 8b and convex portions 8c on both sides. The tee member 8 is formed in a substantially I-shaped cross section, and the concave portions 9a and the convex portions 9b on both sides are fitted into the convex portions 8c and the concave portions 8b of the first magnetic pole tee member 8, respectively. A plurality of second magnetic pole tee members 9 fitted between the magnetic pole tee members 8, coils 10 wound around the magnetic pole tee members 8, 9, and both magnetic pole tee members 8, 9 are surrounded. Arranged in this It is composed of a mold resin 11 for fixing integrated.

  The conventional linear motor is configured as described above, and in assembling the mover 4, first, the coils 10 are wound around the first and second magnetic pole teeth members 8 and 9, respectively. Next, the dovetail groove 8a of each first magnetic pole tooth member 8 is fitted to the coupling member 7 held by the mover yoke 5 via the bolt screw 6, and is slid in a direction perpendicular to the paper surface. The bolts 6 are fastened in position to be fixed on the mover yoke 5 respectively. Next, the concave portions 9a and the convex portions 9b of the second magnetic pole tee member 9 are fitted and slid into the convex portions 8c and the concave portions 8b of the first magnetic pole tee member 8, respectively. Each of the second magnetic pole teeth members 9 is inserted between 8. Finally, these magnetic pole teeth members 8 and 9 and the coil 10 are surrounded by a mold resin 11 and fixedly integrated.

JP 2000-217334 (paragraph 0005, FIG. 1)

As described above, the magnetic pole teeth of the conventional linear motor are generally manufactured by laminating press-punched electromagnetic steel sheets. Therefore, when the motor capacity is increased and the width of the magnetic pole teeth is increased, it is necessary to increase the stacking thickness of the electromagnetic steel sheets. When the stacking thickness is increased, errors due to stacking occur, and the magnetic pole teeth are tilted, resulting in poor assemblability. Furthermore, as the stacking thickness increases, it is necessary to increase the thickness of the press die (lower die), which increases the cost of the die and increases the cost of the magnetic pole teeth.
Further, even when a magnetic pole tee having a structure not laminated with steel plates is adopted, it is necessary to change the width of the magnetic pole tee according to the motor capacity, which becomes a factor that hinders efficiency in production and parts management.

  In order to solve the above-described problems, the present invention is capable of reducing costs by producing magnetic pole teeth and improving efficiency in terms of component management in response to changes in motor capacity.

A linear motor according to the present invention includes a stator yoke extending in a motor driving direction, and a plurality of permanent magnets arranged on the stator yoke at predetermined intervals along the motor driving direction and having different polarities alternately. A stator provided, a plurality of magnetic pole teeth arranged in a predetermined gap with the permanent magnet of the stator and sequentially arranged along the motor driving direction, and coils wound around the magnetic pole teeth A linear motor comprising a mover with
Each of the magnetic pole teeth comprises a plurality of unit magnetic pole teeth arranged so as to contact each other in a direction orthogonal to the motor driving direction, and the plurality of arranged unit magnetic pole teeth are collectively disposed around the periphery thereof. The coil is integrated by being wound .

  Parts management and the like are facilitated and the cost is reduced. In addition, when the magnetic pole teeth are manufactured by laminating electromagnetic steel sheets, the inclination due to the lamination is suppressed, and the productivity is improved.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 shows a configuration of a linear motor according to Embodiment 1 of the present invention, (A) is a plan view, (B) is a side sectional view, and FIG. 2 is a front view showing the configuration of the linear motor in FIG. 1 is a plan view showing a step of sequentially arranging the magnetic pole teeth in FIG. 1, FIG. 4 is a plan view showing a step of connecting and integrating the magnetic pole teeth in FIG. 3 with a connecting member, and FIG. 5 is a welding of the connecting member and the magnetic pole teeth. FIG. 6 is a plan view showing the structure after the step in FIG. 5 is performed, and FIG. 7 is a diagram for explaining the details of welding of the connecting member and the magnetic pole teeth in more detail. is there.

In the figure, a stator 21 has a plate-like stator yoke 22 extending in a motor driving direction (in the direction of a double-headed arrow in the figure), and a predetermined portion along the motor driving direction on the stator yoke 22. It is composed of a plurality of permanent magnets 23 and 24 arranged at intervals and having different polarities alternately. The mover 29 is arranged with a predetermined gap from the permanent magnets 23 and 24 of the stator 21, and has a plurality of magnetic pole teeth 25 arranged along the motor driving direction, and a coil wound around each magnetic pole tooth 25. 28 and a connecting member 27 that connects and integrates a plurality of magnetic pole teeth 25.
In FIG. 1B, the upper portion of the magnetic pole teeth 25 (the back side of the surface facing the stator 21) is a yoke portion 25c, and protrudes downward (side facing the stator 21) from the yoke portion 25c. A tooth portion 25d is formed. A coil 28 is wound around each tooth portion 25d, and the end portions of the yoke portion 25c are in contact with each other, and a plurality of magnetic pole teeth 25 are sequentially arranged.

In FIG. 2, on the back surface of the yoke portion 25c of each magnetic pole tooth 25, a rectangular cross section (width W1, height) along a motor driving direction (direction perpendicular to the paper surface in FIG. 2) at a predetermined position (two locations here). H2) notches 25a are formed, and at both ends, notches 25b having a width of W1 / 2 are formed. And especially the notch 25a continues over the some yoke part 25c, and the groove-shaped recessed part 26 is formed (refer FIG. 1).
The connecting member 27 is engaged over the entire length of the groove-shaped recess 26, so that a plurality of magnetic pole teeth 25 are integrally connected. A screw hole 27a for attachment to a driven part (not shown) is formed at a predetermined position of the connecting member 27.

Next, an assembly process of the mover 29 of the linear motor according to the first embodiment of the present invention configured as described above will be described with reference to the drawings.
First, the coil 28 is wound around each magnetic pole tooth 25. Then, as shown in FIG. 3, the magnetic pole teeth 25 are aligned by bringing the end faces of the yoke portions 25c into contact with each other. Then, by this alignment, the notches 25a are connected to form the groove-shaped recess 26. Next, after engaging the connecting member 27 with the groove-like recess 26 as shown in FIG. 4, welding is performed as shown in FIG. 5, and the connecting member 27 is connected to the yoke portion 25c of each magnetic pole tee 25 as shown in FIG. It sticks to. Then, by this fixing, the magnetic pole teeth 25 are connected and integrated through the connecting member 27 to complete the movable element 29.

The welding procedure shown in FIG. 6 will be described in more detail with reference to FIG. As shown in the figure, the relationship between the height H1 of the connecting member 27 and the depth H2 of the groove-like recess 26 (notch 25a) is important. Since heat shrinkage occurs at the weld point P, if the connecting member 27 warps due to this heat shrinkage, there is a problem in that the surface of the magnetic pole teeth 25 connected and integrated by the connecting member 27, in particular, the surface facing the stator 21 is distorted. Arise.
Therefore, the depth H2 of the groove-like recess 26 is slightly smaller than ½ (H1 / 2) of the height H1 of the connecting member 27 so that the weld point P is located at the center of the connecting member 27 in the height direction. It is desirable to set to.
When H2 <H1 / 2 is set, there is a possibility that the welding point P is slightly below the center position in the height direction of the connecting member 27 depending on the welding operation. In this case, the connecting member 27 tends to warp upward due to the influence of welding, but the plurality of magnetic pole teeth 25 connected to the connecting member 27 are in contact with each other at their ends. Therefore, the distortion of the surface of the magnetic pole teeth 25 facing the stator 21 is sufficiently small compared to the case where the welding point P is shifted upward from the center and the connecting member 27 is warped upward. There is an advantage that there is almost no actual damage.

  As described above, according to the first embodiment, the coupling member 27 is engaged with the groove-shaped recess 26 formed by connecting the notches 25a formed on the back surface of the yoke portion 25c of each magnetic pole tooth 25. Since the magnetic pole teeth 25 are connected and integrated, the assembly of the mover 29 is not troublesome, and the assembly workability can be improved. Further, since adjacent coils 28 are not brought into contact with each other and rubbed together, there is no possibility of causing insulation failure or disconnection, and reliability can be improved.

Further, when the connecting member 27 is fixed to the groove-like recess 26 by welding, the depth H2 of the groove-like recess 26 is smaller than 1/2 of the height H1 of the connecting member 27 (H2 <H1 / 2).
By doing so, the warping of the connecting member 27 can be suppressed and the influence of the warping can be reduced, so that the warping correction work becomes unnecessary, and the assembly workability can be further improved.

Embodiment 2. FIG.
8 is a plan view showing the configuration of the linear motor according to Embodiment 2 of the present invention, FIG. 9 is a front view showing the configuration of the linear motor in FIG. 8, and FIG. 10 is a step of winding a coil around the magnetic pole teeth in FIG. FIG.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the drawing, a stator 31 is configured by arranging permanent magnets 23 and 24 in two rows on a stator yoke 22. Each magnetic pole tooth 25 constituting the mover 37 is composed of two unit magnetic pole teeth 32 arranged in a direction orthogonal to the motor driving direction. Then, as shown in FIG. 10, the two unit magnetic pole teeth 32 arranged so as to contact each other are rotated in the direction of the arrow in the drawing via the winding jig 34, whereby the magnet wire 35 is wound. It is tightened and integrated by a coil 33 formed by turning.

  In the second embodiment, the magnetic pole teeth 25 around which the coils 33 are wound are sequentially aligned by bringing the end faces of the yoke portions 25c into contact with each other in the same manner as in the first embodiment. Then, by this alignment, the notches 25a are connected to form the groove-like recesses 26, and between the rows of the unit magnetic pole teeth 32, the groove-like shape straddling between the unit magnetic pole teeth 32 by the notches 25b formed at the ends. Recesses 36 are respectively formed. As shown in FIG. 9, each of the groove-like recesses 26 and 36 is engaged with a connecting member 27 and welded at a predetermined position as shown in FIG. The mover 37 is configured by being connected and integrated via the.

As described above, according to the second embodiment, two magnetic pole teeth 32 are arranged in a direction perpendicular to the motor driving direction, and the coil 33 is wound around the unit magnetic pole teeth 32 to be integrated together to form the magnetic pole teeth 25. As a result, it is possible to respond to changes in the required thrust (motor capacity) of the linear motor by combination, and it is possible to divert the same parts as well as improve the assembly workability, so that parts management etc. becomes easy Cost can be reduced.
In particular, when magnetic pole tees are manufactured by laminating magnetic steel plates, which are magnetic plates, even if the motor capacity is increased, production is performed for each unit magnetic pole tee. As the mold becomes cheaper, the tilting due to the lamination is suppressed, and the productivity is improved. Further, if the plurality of unit magnetic pole teeth are stacked while being reversed, the fall as the entire magnetic pole teeth can be further reduced.

  Further, since the groove-like recess 36 straddling between both unit magnetic pole teeth 32 is formed and the connecting member 27 is engaged with the groove-like recess 36, the integration is further strengthened and the reliability can be further improved. it can.

  In the above description, two unit magnetic pole teeth are arranged in a direction orthogonal to the motor driving direction, and these are united by winding a coil around the unit. Of course, the number of teeth is not limited to two but may be three or more.

  In addition, the method of configuring each magnetic pole tee with a plurality of unit magnetic pole tees integrated by a coil that is arranged in a direction orthogonal to the motor driving direction and wound together is not necessarily the linear motor described above, That is, the application is not limited to a structure in which a plurality of magnetic pole teeth are connected and integrated by a connecting member. This new method can also be applied to other structures such as those described in the prior art, in which the yoke part and the tooth part are separated and the both parts are joined by a dovetail structure, etc. When the magnetic pole teeth are manufactured by laminating magnetic steel sheets, the tilting inclination caused by the lamination is suppressed, the productivity is improved, and the press die is also inexpensive. .

Embodiment 3 FIG.
11 is a plan view showing the configuration of the linear motor in Embodiment 3 of the present invention, FIG. 12 is a side view showing the configuration of the linear motor in FIG. 11, and FIG. 13 is a front view showing the configuration of the linear motor in FIG. 14 is a front view showing a process of fixing the connecting member and the magnetic pole teeth in FIG. 11 by welding, and FIG. 15 is a plan view showing the configuration after the process in FIG. 14 is performed.
In the figure, the same parts as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, each magnetic pole tooth 41 constituting the mover 42 is composed of two unit magnetic pole teeth 43 arranged in a direction orthogonal to the motor driving direction. Each of the two unit magnetic pole teeth 43 is fastened and integrated by a coil 33 wound around them in the same manner as described in the second embodiment. Further, as shown in FIG. 13, a pair of protrusions 41 b and 41 c are formed on the rear surface of the yoke part 41 a of each unit magnetic pole tooth 43 with a distance W having the same value as the width dimension of the connecting member 27. Yes. Further, at one end of the unit magnetic pole teeth 43 facing each other, one end is formed inward by W / 2 from the end face, and the other end is formed with a protrusion 41d and a protrusion 41d with an interval of W. Yes.

Next, an assembly process of the mover 42 of the linear motor according to the third embodiment of the present invention configured as described above will be described with reference to the drawings.
Two unit magnetic pole teeth 43 are arranged in two rows by abutting the sides of the yoke portion 41a where the projections 41d are formed, and a coil 33 is wound around the two unit magnetic pole teeth 41. 43 is tightened and integrated. The magnetic pole teeth 41 formed by tightening and integration are sequentially aligned in the motor driving direction by bringing the ends of the yoke portions 41a into contact with each other. Then, the recessed part 44 is formed over the some magnetic pole teeth 41 by the clearance gap W between both the protrusion parts 41b and 41c. Further, a recess 44 having a dimension W is also formed between the protrusions 41 d formed at the ends of both unit magnetic pole teeth 43. Therefore, as shown in FIG. 13, the connecting member 27 is engaged with the recess 44 formed between the two protrusions 41b and 41c and between the both protrusions 41d, and as shown in FIGS. 14 (A) and (B). As shown in FIG. 15, welding is performed to fix between the upper ends of the protrusions 41 b, 41 c, 41 d and the upper side surface of the connecting member 27, and between the upper end of the yoke portion 41 a and the lower side surface of the connecting member 27. . The magnetic pole teeth 41 aligned by the fixing are connected and integrated through a connecting member 27 to form a movable element 42.

  As described above, according to the third embodiment, the coupling member 27 is engaged between the protrusions 41b and 41c formed on the back surface of the yoke 41a of each magnetic pole tooth 41 and between the protrusions 41d. Since the magnetic pole teeth 41 are connected and integrated, the assembly of the mover 42 is not troublesome, and the assembly workability can be improved. Further, since the adjacent coils 33 are not brought into contact with each other and rubbed together, there is no risk of insulation failure or disconnection, and reliability can be improved.

  In addition, since both the protrusions 41d are arranged opposite to each other between the rows, the connecting member 27 is engaged across the unit magnetic pole teeth 43, so that the integration is further strengthened and the reliability is further increased. improves. Further, since the connecting member 27 is configured to be engaged with the protrusions 41b, 41c, 41d that form the recess 44, welding is facilitated and assembly workability can be further improved. Further, since both the upper and lower side surfaces of the connecting member 27 are welded, the durability against the moment applied to the welded portion is increased, and the reliability can be further improved.

In the above configuration, the connecting member 27 is engaged with the recesses 44 formed at two places between the two protrusions 41b and 41c and three places between the two protrusions 41d. As can be seen, a gap W is formed between the projecting portions 41c and 41d. Therefore, if necessary, the connecting member 27 is engaged with a recess formed by the gap to further strengthen the integrated structure. You can also.
Further, in the above configuration, the case where each magnetic pole tee 41 is configured by two unit magnetic pole tees 43 has been described. It goes without saying that the same effect can be exhibited by engaging the connecting member with the recess formed by the gap.

Embodiment 4 FIG.
FIG. 16 is a plan view showing the configuration of the linear motor according to Embodiment 4 of the present invention.
In the figure, the same parts as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.
Here, the connecting member 51 has a width dimension W1 larger than the gap W between the two protrusions 41b and 41c, and depressions 51a and 51b that fit into the two protrusions 41b and 41c are formed on both side surfaces. Yes.

  As described above, according to the fourth embodiment, the width 51 of the connecting member 51 is made larger than the gap W between the projecting portions 41b and 41c, and the recesses 51a fitted to the projecting portions 41b and 41c on both side surfaces are provided. Since 51b is formed, the movement of the connecting member 51 in the longitudinal direction is restricted by the fitting of the protrusions 41b and 41c and the recesses 51a and 51b, and the engaging of the connecting member 51 becomes more reliable, and further reliable. Improvements can be made.

Embodiment 5. FIG.
Here, an optimum structure of the connecting member is provided when the magnetic pole teeth are formed by laminating electromagnetic steel plates, which are magnetic plates, in a direction orthogonal to the motor driving direction.
That is, in each of the above-described embodiments, each of the connecting members has a rectangular cross-sectional shape. However, in this fifth embodiment, as shown in FIG. It has a shape.
In this case, the width dimension of the groove-like recess 26 formed by the notch 25a provided in the yoke portion 25c of the magnetic pole teeth 25 is in the stacking direction of the electromagnetic steel sheets, and the thickness of each electromagnetic steel sheet varies or is around the circumference. It can be changed by tightening the coil 28 to be wound. For this reason, a clearance gap may arise between a groove-shaped recessed part and a connection member, and the stable welding effect may not be acquired.
Therefore, the connecting member 61 is constituted by the groove-like recess 26, an engaging portion 61a that engages in the recess 26 via a predetermined gap, and a contact portion 61b that contacts the upper end surface of the recess 26.
As shown in FIG. 18, even if the width W3 of the engaging portion 61a of the connecting member is set to be smaller than the width W2 of the groove-like recess 26, even if some variation occurs in the dimension of the width W2, W2> W3 is satisfied. The gap G is established in the width direction between the two. Further, the height H3 of the engaging portion 61a is set to be smaller than the depth H2 of the groove-shaped recess 26 so that the gap G exists in the height direction of the both.

  As a result, even if some variation occurs in the width dimension of the groove-like recess 26, the lower surface of the contact portion 61b of the connecting member 61 is in intimate contact with the upper surface of the yoke portion 25c of the magnetic pole teeth 25, as shown in FIG. As described above, the welding operation is stabilized by performing welding along the contact portion, and the plurality of magnetic pole teeth 25 can be reliably integrated by the connecting member 61.

  In addition, although this Embodiment 5 demonstrated the case where a connection member was engaged with the groove-shaped recessed part formed of the notch provided in the yoke part, between the both protrusion parts in previous Embodiment 3. FIG. The present invention can be similarly applied to the case where the connecting member is engaged with the concave portion formed by the gap, and an equivalent effect is achieved.

  Although not described in each of the above embodiments, by forming the connecting members 27, 51 and 61 with a magnetic material, the magnetic path can be increased and the performance can be improved.

The structure of the linear motor in Embodiment 1 of this invention is shown, (A) is a top view, (B) is a sectional side view. It is a front view which shows the structure of the linear motor in FIG. It is a top view which shows the process of arrange | positioning sequentially the magnetic pole teeth in FIG. It is a top view which shows the process of connecting and integrating each magnetic pole teeth in FIG. 3 by a connection member. It is a front view which shows the process of adhering a connection member and magnetic pole teeth by welding. It is a top view which shows the structure after the process in FIG. 5 was performed. It is a figure explaining the point of welding with a connecting member and magnetic pole teeth. It is a top view which shows the structure of the linear motor in Embodiment 2 of this invention. It is a front view which shows the structure of the linear motor in FIG. It is a perspective view which shows the process of winding a coil around the magnetic pole teeth in FIG. It is a top view which shows the structure of the linear motor in Embodiment 3 of this invention. It is a side view which shows the structure of the linear motor in FIG. It is a front view which shows the structure of the linear motor in FIG. It is a top view which shows the process of adhering the connection member and magnetic pole teeth in FIG. 11 by welding. It is a top view which shows the structure after the process in FIG. 14 was performed. It is a top view which shows the structure of the linear motor in Embodiment 4 of this invention. It is a front view which shows the structure of the linear motor in Embodiment 5 of this invention. It is a figure which shows the relationship of the dimension of a connection member and a groove-shaped recessed part. It is a front view which shows the process of adhering a connection member and magnetic pole teeth by welding. It is sectional drawing which shows the structure of the conventional linear motor.

Explanation of symbols

21, 31 Stator, 23, 24 Permanent magnet, 25, 41 Magnetic pole teeth,
32, 43 unit magnetic pole teeth, 25a notch, 25c, 41a yoke part,
25d tooth part, 41b-41d protrusion part, 26, 36 groove-like recessed part, 44 recessed part,
27, 51, 61 connecting member, 51a, 51b depression, 61a engaging portion,
61b Contact part, 28, 33 coil, 29, 37, 42 Movable element.

Claims (1)

A stator comprising a stator yoke extending in the motor driving direction, and a plurality of permanent magnets arranged on the stator yoke at predetermined intervals along the motor driving direction and having different polarities alternately, and the fixing A linear element comprising a mover including a plurality of magnetic pole teeth arranged in a predetermined gap with the permanent magnet of the child and sequentially arranged along the motor driving direction, and a coil wound around each of the magnetic pole teeth. A motor,
Each of the magnetic pole teeth comprises a plurality of unit magnetic pole teeth arranged so as to contact each other in a direction orthogonal to the motor driving direction, and the plurality of arranged unit magnetic pole teeth are collectively disposed around the periphery thereof. A linear motor characterized by being integrated by winding the coil.

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