JP5260344B2 - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a compact and high performance linear motor at low cost. <P>SOLUTION: An armature 3 includes a plurality of magnetic pole teeth 31 which are sequentially disposed along a motor drive direction, a drive coil 32 wound to each magnetic pole tooth 31, and a base 33 which comprises a plate-shaped part 330 and a bent part 331, has a cross section substantially in U-shape and extends in a drive direction. The bent part 331 has a joining part 334 in a position in which each magnetic pole tooth 31 is arranged, and each magnetic pole tooth 31 has an engagement part 31a engaged with the joining part 334 at its tip. Then, the plurality of magnetic pole teeth 31 are connected and fixed to the base 33 by the engagement of the engagement part 31a of each magnetic pole tooth 31 with each joining part 334. <P>COPYRIGHT: (C)2010,JPO&amp;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 arrange | positioned. The armature is a substantially U-shaped drive direction having a plurality of magnetic pole teeth sequentially arranged along the motor drive direction, a drive coil wound around each magnetic pole tooth, and a plate-like portion and a bent portion. And a base extending in the direction. The bent portion has a joint at a position where each magnetic tooth is fixed, and each magnetic tooth has an engaging portion that engages with the joint at the tip, and each joint of the bent portion is bent. A concave portion formed on the side opposite to the side in contact with the plate-like portion, and a protruding portion formed on the side of the concave portion, and the protruding portion is fitted into the engaging portion, thereby engaging with the joint portion. A plurality of magnetic teeth are connected and fixed to the base by engaging the joint.

  According to the linear motor of the present invention, since the plurality of magnetic teeth are connected and fixed by fixing the bent portion constituting the base and the tip portions of the magnetic teeth, a sufficient winding space for the drive coil is ensured. In addition, the magnetic path of the magnetic pole teeth can be prevented from being obstructed. Therefore, a small and high performance linear motor can be obtained.

It is a fragmentary perspective view for demonstrating the structure of the linear motor in Embodiment 1 of this invention. It is the fragmentary perspective view, front view, and partial side view for demonstrating the structure of the armature in Embodiment 1 of this invention. It is a perspective view for demonstrating the structure of the magnetic pole teeth in Embodiment 1 of this invention. It is the top view and side view for demonstrating the structure of the 1st core which comprises the magnetic pole teeth in Embodiment 1 of this invention. It is the top view and side view for demonstrating the structure of the 2nd core which comprises the magnetic pole teeth in Embodiment 1 of this invention. It is the top view and side view for demonstrating the structure of the magnetic pole teeth in Embodiment 1 of this invention. It is the fragmentary perspective view and partial side view for demonstrating the structure of the base in Embodiment 1 of this invention. It is explanatory drawing explaining the manufacturing method of the armature in Embodiment 1 of this invention. It is the top view and side view for demonstrating the structure of the 1st core which comprises the magnetic pole teeth in Embodiment 2 of this invention. It is the top view and side view for demonstrating the structure of the 2nd core which comprises the magnetic pole teeth in Embodiment 2 of this invention. It is the top view and side view for demonstrating the structure of the magnetic pole teeth in Embodiment 2 of this invention. It is a fragmentary perspective view which shows the structure of the armature in Embodiment 2 of this invention. It is a perspective view for demonstrating the structure of the magnetic pole teeth in Embodiment 3 of this invention. It is the fragmentary perspective view, front view, and partial side view for demonstrating the structure of the armature in Embodiment 3 of this invention.

Embodiment 1 FIG.
1 is a partial perspective view showing a configuration of a linear motor according to Embodiment 1 of the present invention. 2 is an explanatory view for explaining the structure of the armature, FIG. 2 (A) is a partial perspective view, FIG. 2 (B) is a front view seen from the direction of arrow A in FIG. 2 (A), FIG. 2C is a partial side view seen from the direction of arrow B in FIG.

As shown in FIGS. 1 and 2, the linear motor 1 includes a field part 2 and an armature 3.
The field portion 2 includes a plate-like field yoke 21 extending in two rows along the motor driving direction (the direction of the double-headed arrow in FIG. 1), and the field yoke 21 on the field yoke 21 along the motor driving direction. A plurality of permanent magnets 22 and 23 which are arranged at predetermined intervals and have different polarities alternately.
The armature 3 is arranged between the two rows of permanent magnets 22 and 23 of the field portion 2 with a predetermined interval, and a plurality of magnetic pole teeth 31 arranged sequentially along the motor driving direction, and each magnetic pole tooth 31. And a base 33 for connecting and fixing the plurality of magnetic pole teeth 31 to each other.

  3-6 is a figure for demonstrating the structure of the magnetic pole tooth 31. FIG. FIG. 3 is a perspective view of the magnetic pole teeth 31 (part of the drive coil 32 wound around the magnetic pole teeth is shown). 4A and 4B are views showing the shape of the first core constituting the magnetic pole teeth 31. FIG. 4A is a plan view and FIG. 4B is a side view. FIGS. 5A and 5B are views showing the shape of the second core constituting the magnetic pole teeth 31. FIG. 5A is a plan view and FIG. 5B is a side view. 6A and 6B are diagrams showing the configuration of the magnetic teeth 31. FIG. 6A is a plan view and FIG. 6B is a side view.

As shown in FIGS. 3 to 5, the magnetic teeth 31 are formed by laminating I-shaped cores 34 made of electromagnetic steel plates. For example, the magnetic steel plates are punched into a I-shape with a press and punched steel plates are laminated and punched. It is formed by connecting steel plates with caulking or the like.
The I-shaped core 34 includes a first core 34a and a second core 34b having different shapes on the front end side portion. In the first embodiment, the shape of each core is set as follows, for example. The 1st core 34a is a shape which has the protrusion part 340a in the front end side part of a substantially rectangular core. The shape of the protruding portion 340a is a substantially triangular shape in which the tip side portion of the core 34a has a tapered shape spreading in the tip direction. The second core 34b does not have a protruding portion and has a substantially rectangular shape with a flat front end portion. In addition, the shape of the protrusion part of the 1st core 34a is not restricted to this, For example, an arcuate thing and a square shape may be sufficient.

  As shown in FIGS. 3 and 6, the magnetic pole teeth 31 are formed by alternately laminating the first cores 34a and the second cores 34b. For example, in the first embodiment, as shown in the drawings, the lamination direction In order from the bottom, two first cores 34a, two second cores 34b, four first cores 34a, two second cores 34b, and two first cores 34a It is formed by stacking. With such a configuration, a concave engaging portion 31a is formed at a position where the second core 34b is laminated on the side portion of the tip portion of the magnetic pole tooth 31. The drive coil 32 is wound inside the protrusion 340a using the protrusion 340a of the first core 34a as a positioning winding wall.

  In the first embodiment, a predetermined number of cores 34, ie, a first core 34a having a protruding portion on the tip side and a second core 34b having no protruding portion, are alternately stacked by a predetermined number. Although the concave engaging portion 31a is formed at the tip of the tooth 31, the shape of the core and the number of types of the shape are not limited thereto. If the engaging part can be formed at the tip part of the magnetic teeth by alternately stacking two or more types of cores having different shapes on the tip side part, what is the shape of the tip side part of each core? It may be.

As shown in FIG. 2, the base 33 includes an upper base 33a disposed on the upper side in the stacking direction of the plurality of magnetic teeth 31 and a lower base 33b disposed on the lower side in the stacking direction. A plurality of magnetic teeth 31 are connected and fixed so as to be sandwiched.
The upper base 33a and the lower base 33b have the same shape, and the shape of the upper base 33a will be described with reference to FIG. 7A is a partial perspective view of the upper base 33a, and FIG. 7B is a partial side view.
As shown in the figure, the upper base 33a includes a substantially rectangular plate-like portion 330 and a bent portion 331 extending substantially perpendicularly to the plate-like portion 330 from the long side of the plate-like portion 330, and has a substantially U-shaped cross section. The shape extends in the driving direction. In the first embodiment, the upper base 33a is formed by bending a single plate-like member made of a non-magnetic material into a U-shape. Concave portions 332 for connecting the magnetic teeth are formed at predetermined intervals on the side opposite to the side in contact with the plate-like portion 330 of each bent portion 331 according to the position where the magnetic teeth 31 are fixed. The width of the recess 332 is formed in accordance with the width of the tip portion of the magnetic pole tooth 31. Further, the concave portion 332 is provided with a projection 333 that is engaged with the concave engaging portion 31 a of the magnetic teeth, and the joint 334 is constituted by the concave portion 332 and the projection 333. A notch 335 is provided at the center between the joints 334 arranged adjacent to each other. The width of the plate-like portion 330 (the length of the short side of the plate-like portion 330) is a length that substantially matches the length from one tip of the magnetic pole tooth 31 to the other tip. When the magnetic teeth 31 are connected and fixed, the bent portions 331 are positioned at both end portions of the magnetic teeth 31.

Next, a method for manufacturing the armature 3 in the first embodiment will be described with reference to FIG.
First, as shown in FIG. 8A, the upper base 33a is arranged on the upper side in the stacking direction of the plurality of magnetic teeth 31 around which the drive coil 32 is wound so that the bent portion 331 faces the magnetic teeth 31. The lower base 33 b is arranged on the lower side in the stacking direction of 31 so that the bent portion 331 faces the magnetic pole teeth 31.
Next, as shown in FIG. 8B, the magnetic pole teeth 31 are sequentially fixed to the lower base 33b. The concave portion 332 formed in the bent portion 331 of the lower base 33 b sandwiches the tip portion of the magnetic pole tooth 31 from both sides, and the protrusion 333 formed in the concave portion 332 is placed on the engaging portion 31 a on the lower side of the magnetic pole tooth 31 in the stacking direction. The lower base 33b and the magnetic pole teeth 31 are fixed by fitting. In addition, since the notch part 335 is provided between the junction parts 334 arrange | positioned adjacently, the recessed part 332 of the junction part 334 becomes easy to open, and the protrusion part 333 can be easily engage | inserted in the engaging part 31a. . Further, once fitted, the opening of the recess 332 returns to its original state due to the elastic effect, and the joint portion 334 and the engaging portion 31a are firmly fixed. Similarly, the protrusion 333 of the joint portion 334 of the upper base 33a and the engaging portion 31a on the upper side in the stacking direction of the magnetic teeth 31 are sequentially fitted to fix the upper base 33a and the magnetic teeth 31.
Thus, the armature 3 as shown in FIG. 8C is manufactured by sandwiching and fixing the plurality of magnetic pole teeth 31 between the upper and lower bases 33a and 33b.

As described above, according to the linear motor of the first embodiment, the plurality of magnetic teeth formed by the I-shaped core are provided at the engaging portion provided at the tip portion of the magnetic teeth and the bent portion of the base. Since the joints are connected and fixed by fitting them together, the bending space can be made thin so that a sufficient winding space for the drive coil can be secured. Can turn. 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, a plurality of magnetic teeth can be easily connected and fixed, and there is no need to newly provide parts for fixing, and the manufacturing cost of the armature can be reduced.
Further, by alternately stacking a predetermined number of two types of cores having different shapes on the tip side portion, the engaging portion of the magnetic teeth can be easily configured.
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, it is possible to connect and fix a plurality of magnetic teeth by fitting the engaging portion and the joining portion by providing the engaging portion at the tip portion of the magnetic tooth and providing the joining portion on the base. There is no need to provide a connection fixing hole in the cross-shaped core. Accordingly, it is possible to prevent the magnetic path from being obstructed by the connection fixing hole. 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, if a plurality of magnetic teeth are connected and fixed by engaging the engaging portion provided at the tip portion and the joint portion provided on the base, other shapes can be obtained even when the I-shaped core is adopted. For example, even when a cross-shaped core is adopted, a small and high-performance linear motor can be obtained.

Further, in the first embodiment, the fixing is performed by fitting the engaging portion of the tip portion of the magnetic pole teeth and the joint portion of the base. However, the fixing method is not limited to this, for example, the bent portion of the base and the magnetic pole It is good also as fixing by welding the teeth tip part.
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 on both sides of the magnetic pole teeth in the stacking direction and the magnetic pole teeth are connected and fixed. However, the base can be disposed only on one side and the magnetic pole teeth can be connected and fixed.

Embodiment 2. FIG.
In Embodiment 1 described above, the shape of the second core of the I-shaped core is substantially rectangular. However, in Embodiment 2, the case where the shape of the second core is different will be described. Note that the configuration other than the shape of the core is the same as that in the first embodiment, and the same reference numerals are given and description thereof is omitted.

FIG. 9 is a diagram showing the shape of the first core constituting the magnetic pole teeth of the second embodiment, FIG. 9 (A) is a plan view, and FIG. 9 (B) is a side view. FIG. 10 is a diagram showing the shape of the second core constituting the magnetic pole teeth of the second embodiment, FIG. 10 (A) is a plan view, and FIG. 10 (B) is a side view. 11A and 11B are diagrams showing the configuration of the magnetic pole teeth of the second embodiment. FIG. 11A is a plan view and FIG. 11B is a side view. FIG. 12 is a partial perspective view of an armature formed using the magnetic pole teeth of the second embodiment.
As shown in FIG. 9, the first core 34a of the second embodiment is the same as the first core 34a of the first embodiment, and has a substantially triangular protruding portion 340a in which the width of the core tip side portion is tapered. I have.
As shown in FIG. 10, on the side of the second core 34c of the second embodiment, a misalignment projection 340c is formed a predetermined distance inward from the tip of the core, and the misalignment projection 340c is formed on the first core 34a. The protrusion 340a has a substantially triangular shape with a corner portion cut out. Note that the shape of the protrusion 340c for preventing misalignment is not limited to this, and may be, for example, an arc shape or a quadrangular shape.

A predetermined number of the first cores 34a and the second cores 34c having such shapes are alternately stacked to form the magnetic pole teeth 310 as shown in FIG. In the second embodiment, as in the first embodiment, in order from the lower side in the stacking direction, two first cores 34a, two second cores 34c, four first cores 34a, and second The magnetic pole teeth 310 are formed by stacking two cores 34c and two first cores 34a. As a result, a concave engaging portion 310a is formed at a position where the second core 34c is laminated on the side portion of the tip portion of the magnetic pole tooth 310, and a deviation preventing projection 310b is formed inside the engaging portion 310a. Is done. As shown in FIG. 12, the position of the misalignment-preventing protrusion 310b is located just inside the portion where the bent portion 331 of the upper and lower bases 33a and 33b is positioned when the upper and lower bases 33a and 33b and the magnetic pole teeth 310 are fixed. It is a position. In the second embodiment, a protrusion 310b for preventing misalignment is formed on the inner side of the tip of the magnetic pole tooth 310 by the substantially plate thickness of the bent portion 331.
With the above configuration, even when a force is applied to the armature 3 in the direction of arrow B, for example, the protrusion 333 formed at the joint 334 is locked by the protrusion 310b for preventing misalignment. Prevents the position of the shift.

  As described above, the linear motor according to the second embodiment has the same effect as that of the first embodiment, prevents the magnetic teeth from being displaced, and varies the distance between the magnetic teeth and the field yoke. Can be prevented.

Embodiment 3 FIG.
In the first and second embodiments, the magnetic teeth are formed by laminating two types of I-shaped cores. In the third embodiment, the magnetic teeth are formed by laminating one type of I-shaped cores. A body and an insulator covering the I-shaped core are formed, and an engaging portion is formed in the insulator. Such a configuration of the third embodiment will be described below. Note that portions similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 13 is a perspective view for explaining the magnetic teeth of the third embodiment, and a part of the drive coil 32 wound around the magnetic teeth is shown.
As shown in FIG. 13, the magnetic pole teeth 35 are constituted by a core body 35a formed by laminating one type of I-shaped core, and a pair of insulators 35b covering both end surfaces of the core body 35a on the laminating direction side. Yes. In the third embodiment, an I-shaped core having the same shape as the first core 34a of the first embodiment is laminated to form the core body 35a.
At both end portions of the insulator 35b, a winding wall 350b is formed for positioning the drive coil 32 while preventing the drive coil 32 from being collapsed. The winding wall 350b is formed with a concave engaging portion 351b that engages with the protruding portion 333 formed on the joint portion 334 of the base 33. By attaching such an insulator 35b to the core body 35a, the magnetic pole teeth 35 have a configuration in which an engaging portion is provided at the tip portion.
The insulator 35b is, for example, a resin molded product, and the core body 35a and the drive coil 32 are electrically insulated by winding the drive coil 32 around the magnetic pole teeth 35 via the insulator 35b. The drive coil 32 is easily wound along the winding wall 350b.

14A and 14B are diagrams showing the configuration of the armature 3 formed using the magnetic pole teeth 35. FIG. 14A is a partial perspective view, and FIG. 14B is a view from the direction of arrow A in FIG. FIG. 14C is a partial front view seen from the direction of arrow B in FIG.
As shown in FIG. 14, the plurality of magnetic pole teeth 35 includes an engaging portion 351 b provided on the insulator 35 b constituting the magnetic pole teeth 35 and a protrusion provided on the joint portion 334 of the bent portion 331 of the upper and lower bases 33 a and 33 b. The armature 3 is configured by being connected and fixed by fitting the portion 333 together.

As described above, in the linear motor according to the third embodiment, the magnetic pole teeth are composed of the I-shaped core body and the insulator, and the engaging portion is provided in the insulator. The core body and the drive coil can be electrically insulated by the insulator, and the drive coil can be easily wound.
In Embodiment 3, the insulator is fixed by fitting the engaging portion of the insulator and the joint portion of the base. However, the fixing method is not limited to this. For example, the bent portion of the base and the winding wall of the insulator It is good also as fixing by welding or adhere | attaching.

1 linear motor, 2 field part, 3 armature, 22, 23 permanent magnet,
31 magnetic teeth, 31a engaging part, 32 drive coil,
33, 33a, 33b base, 34 core, 34a first core,
34b, 34c 2nd core, 35 magnetic pole teeth, 35a core body,
35b insulator, 310 magnetic teeth, 310a engaging portion,
310b Protrusion portion for preventing misalignment, 330 plate-shaped portion, 331 bent portion, 332 concave portion,
333 protrusion, 334 joint, 335 notch, 340a protrusion,
340c Protrusion for shifting prevention, 350b winding wall, 351b engaging portion.

Claims (5)

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, a drive coil wound around the magnetic pole teeth, a plate-like portion, and a bent portion. And a base extending in the driving direction of
The bent portion has a joint at a position where the magnetic teeth are fixed, and the magnetic teeth have an engaging portion that engages with the joint at the tip.
Each joint portion of the bent portion includes a concave portion formed on the side opposite to the side in contact with the plate-like portion of the bent portion, and a protruding portion formed on a side portion of the concave portion. Is inserted into the engaging portion, whereby the joining portion and the engaging portion are engaged, and the plurality of magnetic teeth are connected and fixed to the base. The magnetic pole teeth are laminated magnetic teeth formed by laminating cores made of electromagnetic steel plates, and the engaging portions of the magnetic pole teeth are alternately provided with a predetermined number of two or more types of cores having different tip side portions. The linear motor according to claim 1, wherein the linear motor is formed by laminating. 3. The linear motor according to claim 2, wherein a deviation prevention projection is provided inside the engagement portion by providing a deviation prevention projection inside a predetermined distance from the tip of the core side portion. The magnetic pole teeth include a core body and an insulator mounted so as to cover the core body. The insulator includes winding walls for positioning the drive coil at both end portions thereof, and the engaging portion includes the winding wall. The linear motor according to claim 1, wherein the linear motor is formed as follows. 5. The linear motor according to claim 1, wherein the bent portion of the base is provided with a notch between the joint portions disposed adjacent to each other.

Images