JP2010104070A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and high-performance linear motor. <P>SOLUTION: An armature 3 includes a plurality of magnetic pole teeth 31, which are arrayed in order in a direction of motor drive, and a base 32, which couples the plurality of magnetic pole teeth 31. Each magnetic pole tooth 31 includes an I-shaped core 33, an insulator 34, which is mounted to cover the I-shaped core 33, and a drive coil 35, which is wound on the I-shaped core 33 via the insulator 34. The insulator 34 has a fixing part 342A to be fixed with a base 32, and a plurality of magnetic pole teeth 31 are coupled and fixed by the fixing part 342A and the base 32 being fixed to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a linear motor used for general industrial machines.

In a conventional linear motor, the mover structure is constructed by concentrating armature windings in advance on a cross-shaped split core, sandwiching it between the upper member of the mover and the lower member of the mover, and bolting a through hole formed in the center of the split core. The plurality of split cores are connected and fixed through (see, for example, Patent Document 1).
Further, in the conventional linear motor, the armature is an I-shaped armature having an I-shape, and the armature winding is aligned and wound directly in the center of the I-shaped armature, and is formed at both ends of the plurality of I-shaped armatures. Is provided with a prism between adjacent I-shaped armature teeth, and the I-shaped armature is fixed to the base by the prism (for example, see Patent Document 2).

JP-A-11-178310 (paragraph number [0011], FIG. 8 etc.) Japanese Patent Laid-Open No. 10-323011 (paragraph number [0004], FIG. 1 etc.)

  In conventional linear motors, in the case of a cross-shaped split core, the bolts are passed through a through hole opened in the center of the split core, so a drive coil is wound around the center bolt (cross). However, there is a problem that the size becomes large in order to produce sufficient thrust. Further, since the through holes are provided in the split core itself, there is a problem that the magnetic path is hindered.

  Also, in the case of an I-type armature, since the prisms for connecting and fixing are provided at both ends of the I-type armature, a drive coil cannot be wound around the square column part, and in order to produce sufficient thrust There was a problem that the size became large. In addition, it is necessary to separately manufacture a prism, which increases the number of parts and increases costs.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a small and high-performance linear motor.

  The linear motor according to the present invention includes a field portion including a plurality of permanent magnets arranged at predetermined intervals along the motor driving direction and having different polarities alternately, and the permanent magnet of the field portion via the predetermined interval. It is a linear motor comprised from the armature arranged. The armature includes a plurality of magnetic teeth that are sequentially arranged along the motor driving direction and a base that connects the plurality of magnetic teeth. Each magnetic pole tooth includes a core, an insulator mounted so as to cover the core, and a drive coil wound around the core via the insulator. The insulator has a fixed portion that is fixed to the base, and a plurality of magnetic teeth are connected and fixed by fixing the fixed portion and the base.

  According to the linear motor of the present invention, a plurality of magnetic pole teeth are connected and fixed by the fixing portion provided on the insulator and the base, so that a sufficient winding space for the drive coil can be secured, and the magnetic teeth of the magnetic pole teeth can be secured. Can prevent road obstruction. Therefore, a small and high performance linear motor can be obtained.

Embodiment 1 FIG.
FIG. 1A is a perspective view showing the configuration of a linear motor in Embodiment 1 of the present invention, and FIG. 1B is one magnetic pole tooth shown in FIG. 1A, for explaining the configuration of the insulator. A part of the drive coil is omitted. 2A is a cross-sectional view seen from the driving direction side of the linear motor shown in FIG. 1, FIG. 2B is a plan view seen from the upper side of FIG. 2A, and FIG. 2C is FIG. FIG. 2D is an explanatory view for explaining the action of the insulator. 3A to 3C are explanatory views for explaining a method of manufacturing the armature of the linear motor shown in FIG. 4 is a cross-sectional view when the armature of the linear motor shown in FIG. 1 is fixed by a mold.

  As shown in FIGS. 1 and 2, the linear motor 1 includes a field part 2 and an armature 3. The field magnet section 2 includes a plate-shaped field yoke 21 extending in two rows along the motor driving direction (the direction of the double-headed arrow in FIG. 1A), and a motor on the field yoke 21. It has a plurality of permanent magnets 22 and 23 which are arranged at predetermined intervals along the driving direction and have different polarities alternately. The armature 3 is disposed between the two rows of permanent magnets of the field portion 2 with a predetermined interval, and a plurality of magnetic pole teeth 31 that are sequentially arranged along the motor driving direction, and the plurality of magnetic pole teeth 31. And a base 32 for connecting and fixing.

The magnetic pole teeth 31 include an I-shaped I-shaped core 33, an insulator 34 that is mounted so as to cover the I-shaped core 33, and a drive coil 35 that is wound around the I-shaped core 33 via the insulator 34. (See FIG. 1B).
The I-shaped core 33 is formed, for example, by punching electromagnetic steel sheets into an I-shape with a press, stacking the punched steel sheets, and connecting the steel sheets by punching and the like.
The insulators 34 are, for example, resin molded products, and are formed as a pair so as to cover portions where the drive coil 35 of the I-shaped core 33 is wound from both sides of the coil end side end surface (stacking direction end surface) of the I-shaped core 33. Installed. Winding walls 341 for preventing the winding of the driving coil 35 from being collapsed are provided at both ends in the winding direction of the driving coil 35 on the coil end side end face of the insulator 34. When the drive coil 35 is wound via the insulator 34, the I-shaped core 33 and the drive coil 35 are electrically insulated. Further, the drive coil 35 is easily wound along the winding wall 341.
The coil end refers to a portion where the drive coil 35 wound around the I-shaped core 33 is exposed to the outside from both end surfaces of the I-shaped core 33 in the stacking direction. The winding direction of the drive coil 35 is the direction of a double-headed arrow in FIG. 2B and is a direction perpendicular to the field yoke 21 of the field part 2.

  The base 32 for connecting and fixing the plurality of magnetic pole teeth 31 is a plate-like member extending in the driving direction, and is disposed on one coil end side of the magnetic pole teeth 31. In the first embodiment, the magnetic pole teeth 31 are arranged below the coil end portion. A convex shape for attaching a driven device (not shown) driven by the linear motor 1 to the back side of the surface of the base 32 facing the magnetic pole teeth, in the first embodiment, to the bottom surface side of the base 32. A mounting portion 32A is provided. Bolt holes 32B (see FIG. 3A) for fixing bolts are provided at predetermined intervals on both side surfaces of the base 32 facing the field portion 2.

The insulator 34 mounted on the side where the base 32 is disposed, that is, the lower insulator 34A (34) in the first embodiment, fixes the insulator 34A and the base 32 to the winding walls 341A (341) on both sides. A fixing portion 342A is provided (see FIG. 1B).
The fixing portion 342A has a shape that extends in the direction of the base 32 from the end portions of the winding walls 341A on both sides, contacts the base 32, and is sandwiched from both sides, whereby the insulator 34A and the base 32 are fixed. Further, the fixing portion 342A is provided with a through hole 343A for bolting the insulator 34A to the base 32.
Further, as shown in FIGS. 2C and 2D, on the base 32 side of the fixed portion 342A, when the base 32 is sandwiched, the magnetic teeth 31 are vertically moved (both narrow directions in FIG. 2D). In order to determine the position in the direction of the arrow, a positioning portion 344A notched in a step shape is provided. Further, the positioning portion 344A also plays a role of preventing the magnetic pole teeth 31 from rotating in the direction of the thick double arrow in FIG. 2D when a force in the driving direction is applied to the magnetic pole teeth 31.
Further, as shown in FIGS. 2 (C) and 2 (D), on the field part 2 side of the fixed part 342A, a notch that is notched in a step shape so that the head of the bolt 36 does not protrude toward the field part 2 side. A notch 345A is provided. In the first embodiment, the bolt 36 is a low head bolt to further prevent the bolt 36 from jumping out to the field part 2 side.

Next, a method for manufacturing the armature 3 configured as described above will be described with reference to FIG.
First, as shown in FIG. 3A, the magnetic pole teeth 31 and the base 32 are arranged so that the insulator 34A side having the fixing portion 342A and the base 32 face each other.
Next, as shown in FIG. 3 (B), both side surfaces of the base 32 on the field magnet part 2 side are sandwiched by both fixing portions 342A of the insulator 34A of each magnetic pole tooth 31, and the insulator 34A and the base 32, ie, the magnetic pole teeth 31 are sandwiched. And the base 32 are fixed. At this time, the position of the magnetic pole teeth 31 in the vertical direction is fixed by contacting the positioning portion 344A and the surface of the base 32 facing the magnetic pole teeth 34A (the upper surface of the base 32 in the first embodiment). . Then, the bolts 36 are passed through the through holes 343A of the fixing portion 342A from the both magnetic field portion 2 sides and bolted to the bolt holes 32B of the base 32, thereby fixing the magnetic teeth 31 and the base 32 more firmly. The base 32 is arranged so that the mounting portion 32A is not on the insulator 34A side. That is, in this Embodiment 1, it arrange | positions so that the attaching part 32A may become a lower side.
Thus, the armature 3 as shown in FIG. 3C is manufactured by sequentially fixing the plurality of magnetic pole teeth 31 on the base 32.

  In addition, as shown in FIG. 4, if the armature 3 whole is fixed by the mold 37 except the attachment part 32A of the base 32, the rigidity of the armature 3 can be made stronger.

As described above, in the linear motor according to the first embodiment, the plurality of magnetic teeth formed by the I-shaped core are connected and fixed by the fixing portion provided on the insulator and the base, so that the winding space of the drive coil is reduced. It can be secured sufficiently, and many drive coils can be wound even with a small size. Therefore, a small and high performance linear motor can be obtained. Since the input current required to obtain the same output can be reduced by increasing the number of coil turns, the energy consumption can be reduced.
In addition, since the insulator for insulating the I-shaped core and the drive coil is provided with a fixing portion for connecting and fixing the magnetic teeth, it is not necessary to separately prepare a member for connecting and fixing, reducing the number of parts and reducing the cost. Can be reduced.
In addition, the number of parts described above can be reduced in the manufacturing process of the linear motor, and the above-described energy consumption can be reduced in the process of using the linear motor. Therefore, the environmental load can be reduced at each stage in the product life cycle. it can.
In the first embodiment, the magnetic pole teeth are formed by the I-shaped core. However, the present invention is not limited to this shape. For example, the magnetic pole teeth may be formed by a cross-shaped core. Even in this case, a plurality of magnetic teeth can be connected and fixed by providing a fixing portion on the insulator attached to the cross-shaped core and fixing the fixing portion and the base. There is no need to provide fixing holes. Therefore, the magnetic path can be prevented from being obstructed by the fixing hole, and the characteristics can be improved. Thereby, similarly to the case where the above-mentioned I-shaped core is used, a small high-performance linear motor can be obtained, and the energy consumption can be reduced.
Therefore, by connecting and fixing a plurality of magnetic teeth by the fixing portion provided on the insulator and the base, it is possible to reduce the size even when an I-shaped core is adopted or when other shapes such as a cross-shaped core are adopted. A high-performance linear motor can be obtained.

In addition, by providing the fixed portion on the winding wall of the insulator, the winding wall can facilitate winding of the driving coil, and the positioning can be performed while preventing the winding of the driving coil from being collapsed. The coil can be insulated and the magnetic pole teeth can be connected and fixed.
In addition, since the magnetic teeth and the base are fixed by the fixing portion coming into contact with and sandwiching both sides of the base, the magnetic teeth can be connected and fixed with a simple configuration.

Moreover, the magnetic teeth can be more firmly connected and fixed by bolting the fixing portion and the base of the insulator through the through hole of the fixing portion.
Further, by performing bolting with a low head bolt, it is possible to prevent the bolt from jumping out to the field part side.

  In the first embodiment, bolts are used to more firmly fix the magnetic teeth and the base. However, the fixing portion of the insulator and the base may be welded, and the same effect can be obtained.

  In the first embodiment, the case of a double-sided linear motor has been described. However, the armature of the first embodiment may be applied to a one-sided linear motor, and the same effect can be obtained.

  In the first embodiment, the base is disposed only on one side of the coil end of the magnetic teeth and fixed by the insulator. However, the base may be disposed and fixed on both sides. By connecting and fixing both sides, the magnetic teeth can be connected and fixed more firmly.

  In the first embodiment, the base is plate-shaped, but the base is not limited to this, and can be fixed to the fixing portion of the insulator, and if a plurality of magnetic teeth can be connected and fixed, for example, a rod-shaped one can be used. Well, the same effect can be obtained.

1A is a perspective view showing the configuration of the linear motor according to Embodiment 1 of the present invention, and FIG. 1B is one magnetic pole tooth shown in FIG. 1A, with a part of the drive coil omitted. Is. 2A is a cross-sectional view seen from the driving direction side of the linear motor shown in FIG. 1, FIG. 2B is a plan view seen from the upper side of FIG. 2A, and FIG. 2C is FIG. FIG. 2D is an explanatory view for explaining the action of the insulator. It is explanatory drawing for demonstrating the manufacturing method of the armature of the linear motor shown in FIG. It is sectional drawing at the time of fixing the armature of the linear motor shown in FIG. 1 with a mold.

Explanation of symbols

1 linear motor, 2 field part, 22, 23 permanent magnet, 3 armature,
31 magnetic teeth, 32 base, 33 I-shaped core (core),
34, 34A insulator, 341, 341A winding wall, 342A fixing part,
343A Through hole, 35 drive coil, 36 bolt, 37 mold.

Claims (11)

A field portion including a plurality of permanent magnets arranged at predetermined intervals along the motor driving direction and having different polarities alternately, and an armature disposed at a predetermined interval from the permanent magnets of the field portions. A linear motor,
The armature includes a plurality of magnetic pole teeth sequentially arranged along the motor driving direction, and a base connecting the plurality of magnetic pole teeth,
Each of the magnetic teeth includes a core, an insulator mounted so as to cover the core, and a driving coil wound around the core via the insulator.
The insulator has a fixing portion fixed to the base, and the plurality of magnetic teeth are connected and fixed by fixing the fixing portion and the base. The linear motor according to claim 1, wherein the base is disposed on a coil end side of the plurality of magnetic pole teeth. The said insulator has a winding wall which positions the said drive coil in the coil winding direction both ends of a coil end side end surface, The said fixing | fixed part was provided in the winding wall of the said insulator. Linear motor. 4. The linear motor according to claim 3, wherein the fixing portion extends from the winding wall in the base direction, contacts the both side surfaces of the base, and is fixed to the base by sandwiching the base. The linear motor according to claim 4, wherein the fixing portion has a through hole, and is fixed to the base through a bolt through the through hole. 6. The linear motor according to claim 5, wherein the bolt is a low head bolt. The linear motor according to claim 1, wherein the base and the fixing portion are fixed by welding. The linear motor according to claim 1, wherein the core is an I-shaped core having an I-shape. 2. The permanent magnets are arranged at predetermined intervals in two rows along a motor driving direction, and the armatures are arranged at predetermined intervals between the permanent magnets. The linear motor of any one of thru | or 8. The linear motor according to claim 2, wherein the base is disposed on both sides of a coil end of the magnetic pole teeth. The linear motor according to claim 1, wherein the armature is fixed by a mold.

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