JP2010115042A - Linear motor armature, linear motor, and table feed device using the linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor armature that suppresses warpage occurring along the longitudinal direction of an armature core due to a difference in temperature shrinkage rate between a mold resin and the armature core when fixing the whole armature by the mold resin, and also, secures an optimum magnetic air gap between the armature and a magnetic field without an armature mounting plate so as to suppress the occurrence of thrust ripples, and also to provide a linear motor, and a table feed device. <P>SOLUTION: When fixing the whole armature 2 of a linear motor 1 by a mold resin 6, in order to suppress warpage occurring along the longitudinal direction of an armature core 3 due to a difference in temperature shrinkage rate between the mold resin 6 and the armature core 3, a cut 4 for dividing the armature core is previously formed toward a direction orthogonal to the longitudinal direction of the armature core 3 at least in one part of the bottom part of a winding storage groove 3c. The armature core 3 is bent at a prescribed angle in the direction opposite to the warpage direction of the armature core 3 during mold fixing centering around the cut 4 so as to join and fix the cut 4 by welding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

INDUSTRIAL APPLICABILITY The present invention is used, for example, for table feed of a machine tool or the like, and is a gap-opposing linear motor armature and linear motor arranged so that the gap surfaces of the field and armature face each other, and uses the same. Table feeder.
About.

2. Description of the Related Art Conventionally, a gap-facing linear motor that is used for table feed of a machine tool or the like and is arranged so that the gap surfaces of a field and an armature face each other is configured as shown in FIGS. (For example, see Patent Document 1 and Patent Document 2).
FIG. 3 is a side sectional view of a gap-opposing linear motor showing the first prior art.
In FIG. 3, 30 is a linear motor, 31 is a field, 32 is an armature, 33 is an armature core, 33a is a teeth portion, 33b is a winding housing portion, 34 is an armature winding, 35 is a mold resin, 36 Is a field yoke, 37 is a permanent magnet, 38 is an armature mounting plate, 39 is a bolt screw, 40 is a pocket hole, and 41 is a coupling member.
The linear motor 30 is basically composed of a field 31 and an armature 32. Among these, the field 31 is along the longitudinal direction on the flat field yoke 36 (the stroke direction of the linear motor 30). A plurality of permanent magnets 37 having different polarities are arranged adjacent to each other at an equal pitch.
On the other hand, the armature 32 includes an armature core 33 in which electromagnetic steel plates punched in a comb shape are stacked, and a plurality of teeth portions 33a and teeth portions are formed on one side surface of the electromagnetic steel plates at an equal pitch in the longitudinal direction. A winding accommodating portion 33b serving as an opening between the armature windings 34 is formed, and the armature winding 34 aligned and wound around the winding accommodating portion 33b is accommodated. At this time, a pocket hole 40 is formed inside the surface of the armature core 33 facing the armature mounting plate 38, and a coupling member 41 having a female screw hole is provided in the pocket hole 40. The coupling member 41 provided in the pocket hole 40 and the armature mounting plate 38 are screw-coupled using a bolt screw 39. Further, the armature 32 is firmly fixed by the mold resin 35 so as to cover the entire armature core 33 and the armature winding 34.
On the lower surface of the armature core 33 that houses the plurality of armature windings 34, a magnet row of permanent magnets 37 arranged along the stroke direction of the linear motor 30 is interposed between the core 33 and a magnetic gap. In addition to being arranged, the longitudinal direction of the teeth 33a of the core 33 and the longitudinal direction of the magnet row are arranged at right angles.
In the above configuration, when alternating current is supplied to the armature winding 34 of the linear motor 30 from a power source (not shown). Due to the electromagnetic action of the armature winding 34 and the permanent magnet 37, a field magnetic flux is generated so as to penetrate the teeth 33 a of the laminated armature core 33, and the armature 32 and the field 31 of the linear motor 31 are relative to each other. Drive.
Next, the second prior art will be described.
4A and 4B are side sectional views of a gap-opposing linear motor showing the second prior art, in which FIG. 4A is a plan view of a welding fixing portion of an armature mounting plate, and FIG. Yes, (a) is a view of (b) from above. In addition, the description is abbreviate | omitted about the same component as the 1st prior art, and only a different point is demonstrated.
In FIG. 4, 42 is a long hole and 43 is a welding part.
In the linear motor 30 configured as described above, the armature core 33 improves the motor characteristics along the stroke direction, and prevents the armature mounting plate 38 from being reduced in strength against the armature core 33. A plurality of elongated holes 42 penetrating through the armature core are provided, and projections (not shown) are provided on the surface facing the elongated holes 42 of the armature core, and the projections (not shown) are inserted into the elongated holes 42, 38 is welded and fixed at a welded portion 43 (corresponding to a position of a projection not shown) of the armature core 33.
Japanese Patent Laid-Open No. 9-70166 (page 3 of specification, FIG. 3) Japanese Utility Model Laid-Open No. 5-11786 (page 3 of the specification, FIGS. 6 to 8)

However, both the first prior art and the second prior art have the following problems in common. FIG. 5 is a side view showing a state of warpage occurring in a conventional armature core.
(1) When fixing with the mold resin so as to cover the entire armature composed of the armature core and the armature winding, the temperature of the mold resin and the armature core etc. filled in the tooth opening (winding storage groove) Since there is a difference in contraction rate, the tooth opening becomes narrow, that is, warpage occurs due to the difference in contraction rate along the longitudinal direction of the armature core (the stroke direction of the linear motor) as shown in FIG. As a result, there is a problem that the magnetic gap between the armature and the field yoke becomes narrow due to the mechanical strain and magnetostriction due to the deformation of the armature core teeth, making it difficult to mount the motor and the thrust ripple. There is a problem that the motor characteristics deteriorate due to increase.
(2) Further, since an armature mounting plate is required, there is a problem that the motor size increases and the motor efficiency deteriorates. As a result, there is a problem that the number of parts is increased, and material costs and manufacturing man-hours are also increased.
The present invention has been made in view of such a problem, and when the entire armature is fixed with a mold resin, the longitudinal direction of the armature core is caused by the difference in the shrinkage rate of temperature between the mold resin and the armature core. A linear motor armature that can suppress the warp that occurs along the armature, can prevent an armature mounting plate, can secure an optimal magnetic gap between the armature and the field, and can suppress the generation of thrust ripple. It is another object of the present invention to provide a linear motor and a table feeder using the linear motor.

In order to solve the above problem, the invention according to claim 1 has a plurality of teeth portions formed so as to be arranged at equal pitches in the longitudinal direction on one side surface of the electromagnetic steel sheet punched into a comb shape. And an armature core formed by laminating the electromagnetic steel sheets, an armature winding housed in an aligned winding in a winding housing groove formed between the teeth, and an armature constituted by: When the entire armature is fixed with a mold resin, a linear motor armature having the above-mentioned is generated along the longitudinal direction of the armature core due to a difference in temperature shrinkage between the mold resin and the armature core. A cut for dividing the armature core in advance in a direction perpendicular to the longitudinal direction of the armature core is formed in at least one position of the bottom of the winding housing groove so as to suppress warpage. , The electric The core is bent at a predetermined angle toward the direction opposite to the direction of warpage generated along the longitudinal direction of the armature core when the mold is fixed, and the cut is joined and fixed by welding. It is characterized by being.
According to a second aspect of the present invention, in the linear motor armature according to the first aspect, the armature core and the armature winding are integrally fixed by a mold resin.
According to a third aspect of the present invention, the linear motor armature according to the first or second aspect and the armature and the armature are arranged opposite to each other via a magnetic gap, and a plurality of plates having different polarities alternately are provided. Of the permanent magnets arranged side by side, and the armature and the field are relatively driven by using either the armature or the field as a stator and the other as a mover. It features a linear motor.
According to a fourth aspect of the invention, there is provided a table feeding device using the linear motor according to the third aspect as a drive source for the linear motion mechanism.

According to the first and second aspects of the present invention, the armature core punched out from the electromagnetic steel sheet is divided into a plurality of cuts, and the divided armature cores are welded at a predetermined angle. Since the linear motor armature has a mold resin shrinkage when the mold resin is fixed so as to cover the entire armature core and armature winding, a plurality of angled armature mounting surfaces return to a flat surface. Therefore, it is possible to obtain an armature mounting plate-less structure that suppresses the warp generated when the mold resin is fixed and eliminates the armature mounting plate provided for suppressing the warp of the conventional armature core.
According to the third aspect of the present invention, a linear motor is configured by combining the armature according to the first and second aspects with the field according to the third aspect, so that the armature is influenced by mechanical distortion or magnetic distortion. It is possible to suppress a decrease in magnetic gap between the magnetic field and the field and an increase in thrust ripple, and it is possible to reduce adverse effects on motor characteristics. Furthermore, since the armature mounting plate is unnecessary, the material cost and the number of manufacturing steps can be reduced, and the motor size can be reduced.
Moreover, according to the invention of Claim 4, the table feeder which has the effect of the linear motor of Claim 3 can be provided.

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

FIG. 1 is a side sectional view of a gap-facing linear motor showing an embodiment of the present invention.
In FIG. 1, 1 is a linear motor, 2 is an armature, 3 is an armature core, 3a is a core bottom surface, 3b is a tooth, 3c is a winding housing portion, 4 is a cut, 4a is a welded portion, and 5 is an armature winding. Line 6, mold resin, 7 field yoke, 8 permanent magnet, 9 field.
In the linear motor 1 according to the present invention, the field motor 9 and the armature 2 are basically configured, and the field 9 has a plurality of different polarities alternately along the longitudinal direction on the field yoke 7. The permanent magnets 8 are arranged adjacent to each other at an equal pitch, and the armature 2 includes an armature core 3 in which electromagnetic steel plates punched in a comb-teeth shape are laminated, and between the tooth portions 3 b of the armature core 3. The armature winding 5 aligned and wound in the winding storage portion 3c serving as the opening is the same as the conventional technology.
The present invention is different from the conventional one as follows.
That is, the armature 2 of the linear motor 1 has an armature mounting plate-less structure that does not require a conventional armature mounting plate. As a specific measure, the entire armature 2 shown in FIG. 1, first, in order to suppress the warp that occurs along the longitudinal direction of the armature core 3 due to the difference in temperature shrinkage between the mold resin 6 and the armature core 3, first, in FIG. A cut line 4 for dividing the armature core in advance in a direction perpendicular to the longitudinal direction of the armature core 3 is formed in at least one place on the bottom. At the center, the core 4 is bent at a predetermined angle toward the core bottom surface 3a, which is opposite to the direction of warpage generated along the longitudinal direction of the armature core 3 when the mold is fixed, and the cut 4 is bonded and fixed by welding. What Going on (both 1 and 2, provided slit 4 the one place in the armature core 3, an example in which the core 3 is divided into two, welds are welds 4a).
In this way, the armature core 3 in which the cuts 4 are integrated by welding is integrally fixed together with the armature winding 5 by the mold resin 6 as shown in FIG. 1, and the armature 2 is completed.
The armature core 3 is provided with a plurality of cuts 4 in the longitudinal direction, and by dividing the core 3 into a plurality of angles, the armature core 3 is angled in the direction opposite to the warp caused by mold resin shrinkage, and is joined by welding. It doesn't matter. After the weld 4a of the cut 4 is welded and fixed, the armature 2 is firmly fixed by the mold resin 6 so as to cover the entire armature core 3 and the armature winding 5.

  The linear motor 1 according to the embodiment of the present invention is divided by providing a cut 4 in advance along the longitudinal direction of the armature core 3, and the core bottom surface 3 a in the armature core 3 divided by the cut 4 is used as the armature. Since it is bent at a predetermined angle in the direction opposite to the warping direction when the mold resin is fixed and welded at the welded portion 4a, the armature core 3 and the entire armature winding 5 are actually covered. When fixing with the mold resin 6, there is a difference in the shrinkage rate of the temperature between the mold resin and the armature core filled in the winding housing portion 3 c that is the tooth opening, so that the bottom surfaces of the cores that are angled in advance Since 3a can return to a plane, the armature mounting plate provided for the conventional curvature suppression becomes unnecessary.

According to the present invention, the linear motor armature is welded at a predetermined angle on the armature core, and is fixed integrally with the mold resin so as to cover the entire armature. Since the warpage caused by the contraction of the armature can be suppressed, an armature mounting plate-less structure can be adopted, and the fluctuation of the magnetic gap between the field and the armature caused by the influence of the mechanical strain, magnetostriction, etc. of the motor can be reduced. Stabilizes and facilitates motor mounting and eliminates motor ripple problems such as thrust ripple, so in addition to table devices for large machine tools that require high precision and high rigidity, semiconductor manufacturing equipment It can also be applied to other uses.
It is useful for.

The side sectional view of the gap opposed type linear motor which shows the example of the present invention, The side view of the armature core of the linear motor of the present invention, Side sectional view of gap-opposing linear motor showing the first prior art, It is a gap-opposing linear motor showing the second prior art, wherein (a) is a plan view of a welding fixing portion of an armature mounting plate, (b) is a side sectional view of the linear motor, Side view showing the state of warping occurring in a conventional armature core

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear motor 2 Armature 3 Armature core 3a Core bottom face (armature mounting surface)
3b Teeth part 3c Winding storage part 4 Welding part 5 Armature winding 6 Mold resin 7 Field yoke 8 Permanent magnet

Claims (4)

An armature core having a plurality of teeth portions formed so as to be arranged at equal pitches in the longitudinal direction on one side surface of an electromagnetic steel sheet punched in a comb-like shape; In an armature of a linear motor comprising: an armature winding that is arranged and stored in a winding storage groove formed between the teeth; and an armature that is configured by:
When the whole armature is fixed by a mold resin, the winding is controlled so as to suppress warping that occurs along the longitudinal direction of the armature core due to the difference in shrinkage rate between the temperature of the mold resin and the armature core. A cut for dividing the armature core in advance in a direction perpendicular to the longitudinal direction of the armature core is formed in at least one place of the bottom of the storage groove,
The armature core is bent at a predetermined angle toward the direction opposite to the direction of warpage generated along the longitudinal direction of the armature core when the mold is fixed, and the cut is joined by welding. A linear motor armature characterized by being fixed.   2. The linear motor armature according to claim 1, wherein the armature core and the armature winding are fixed integrally with a mold resin. The linear motor armature according to claim 1 or 2,
A magnetic field that is disposed opposite to the armature via a magnetic air gap and is arranged side by side with a plurality of permanent magnets alternately having different polarities on a flat field yoke,
A linear motor characterized in that the armature and the field travel relatively with one of the armature and the field as a stator and the other as a mover.   A table feeding device using the linear motor according to claim 3 as a drive source of a linear motion mechanism.

Images