JP5379458B2 - Coreless linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coreless linear motor having a mover which is moved at higher speed and not damaged due to stress caused by acceleration and deceleration even if the mover is moved at a high speed. <P>SOLUTION: A coreless linear motor comprises a stator and a moving member movable relative to the stator. The stator includes a yoke having a recess extending in the longitudinal direction and field magnets arranged facing each other in the recess so that polarities are different from each other via a magnetic gap and adjoining polarities are also different. The moving member includes a plurality of coils arranged in parallel to each other and a fixing means formed in a portion of the coil so as not to face the field magnets in the coreless linear motor disposed inside the magnetic gap. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a coreless linear motor, and specifically relates to a coreless linear motor in which a coil is not damaged even when a mover is moved at a high speed.

  Conventionally, as a linear motor for moving a mover, a stator is arranged so as to be opposed to each other so that a yoke having a groove extending in a longitudinal direction and a magnetic gap in the groove are different in polarity from each other. The field magnets are arranged so that the polarities adjacent to each other are different from each other, and the mover includes a plurality of coils arranged in parallel, and is disposed in the magnetic gap, and the mover is arranged with respect to the stator. A coreless linear motor arranged so as to be relatively movable is known.

  The coreless linear motor having such a configuration forms a multi-phase coil by shifting a plurality of coils and applies a drive current to each of the coils constituting the multi-phase coil as a U-phase coil, a V-phase coil, and a W-phase coil. Thus, based on Fleming's left-hand rule, it is possible to generate a thrust according to the magnetic flux generated by the field magnets arranged in the stator.

  Since such a coreless linear motor is not formed by winding a coil around an iron core (core), a heavy iron core can be omitted from the mover, which contributes to reducing the weight of the mover and is movable. The child can be moved at high speed.

  However, a recent industry has demanded a coreless linear motor that realizes further high-speed movement. As an improvement in the thrust of the coreless linear motor, a coil arrangement method described in Patent Document 1 is known. According to this coil arrangement method, a longitudinal end of a coil wound in an oval shape having a pair of straight portions is bent in one direction perpendicular to the winding direction to form a relief portion. The windings on one side of the linear part of both adjacent coils are arranged on the inside, and the coil is arranged by reversing the bending direction of the relief part so that the coils do not contact each other at the longitudinal end of each coil doing. The coil is fixed by being sandwiched between insulator frames made of glass epoxy resin or the like.

  By arranging the coils in this way, the ends of adjacent coils can be arranged without overlapping, and the coils can be arranged closely without gaps. Further, the coil itself can be formed thin, and the magnetic gap of the field magnet can be reduced. As described above, the coreless linear motor described in Patent Document 1 can improve the thrust because the gap between the windings of the coil and the magnetic gap of the field magnet can be formed small.

JP 2002-112523 A

  However, in order to further increase the speed of the mover, in the configuration of the conventional coreless linear motor, as the moving speed of the mover increases, the stress applied to the mover increases due to the acceleration / deceleration of the mover. When the is moved at a high speed, there is a problem that the mover is damaged due to the concentration of the stress.

  The present invention has been made in order to solve the above-described problems, achieves a further increase in the moving speed of the mover of the coreless linear motor, and moves the mover of the coreless linear motor at a high speed. Even if it is a case, it aims at providing the coreless linear motor with which a needle | mover is not damaged by the stress accompanying the acceleration / deceleration of a needle | mover.

In order to solve the above problems, a coreless linear motor according to the present invention includes a stator and a movable element movable relative to the stator, and the stator has a yoke having a groove extending in a longitudinal direction; In the groove, there are provided magnetic field magnets arranged opposite to each other so as to have different polarities, and adjacent magnetic poles are arranged so as to have different polarities, and the movers are arranged in parallel. In the coreless linear motor disposed in the magnetic gap, the coil is opposed to the field magnet in the coreless linear motor provided with a plurality of coils and a bracket for sandwiching upper ends of the coils via a heat transfer member comprising a fixing means formed in the region except the sites, the fixing means is formed at a lower end portion located opposite to the bracket with a fixed upper portion of the plurality of coils 1st fixing means and 2nd fixing means formed in the site | part which the said bracket clamps these several coils, The said fixing means remove | excluded the site | part facing the said field magnet of the said coil. the site is characterized that you have been formed by resin molding.

  According to the present invention, since the fixing means is provided only in the portion excluding the portion facing the field magnet of the coil, it contributes to the reduction of the weight of the mover and further increases the moving speed of the mover. Since the fixing means is formed at a portion where stress due to acceleration / deceleration of the mover is concentrated, damage to the mover due to the concentration of the stress can be prevented.

  Hereinafter, a coreless linear motor according to the present invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Absent.

  FIG. 1 is a perspective view showing a coreless linear motor according to this embodiment, FIG. 2 is a front view of the coreless linear motor according to this embodiment, and FIG. 3 is a diagram of the coreless linear motor according to this embodiment. 4 is a perspective view showing a stator, FIG. 4 is a perspective view showing a mover of a coreless linear motor according to this embodiment, and FIG. 5 is a diagram illustrating a configuration of the mover of the coreless linear motor according to this embodiment. FIG. 6 is a side view for explaining the shape of the coil of the coreless linear motor according to the present embodiment, and FIG. 7 is an array of the coil of the coreless linear motor according to the present embodiment. It is a side view for demonstrating a method.

  As shown in FIG. 1, the coreless linear motor 1 according to this embodiment includes a stator 10 and a mover 20.

  Further, as shown in FIG. 2, the coil 21 of the mover 20 is inserted into the groove 13 formed in the stator 10, and the mover 20 is disposed so as to be movable relative to the stator 10. As shown in FIG. 1, the stator 10 is formed by connecting a plurality of yokes 11 along the longitudinal direction (moving direction of the mover). Thus, the movable range (stroke amount) of the mover 20 can be easily changed by appropriately changing the number of yokes 11 to be connected. Note that the coil 21 of the mover 20 is electrically connected to a drive power source (not shown), and the drive current applied to the coil 21 is controlled so that the mover 20 is relative to the stator 10. A movable thrust can be applied to the.

  Next, the stator 10 and the mover 20 constituting the coreless linear motor 1 according to the present embodiment will be described with reference to the drawings.

  As shown in FIG. 3, the stator 10 includes a field magnet composed of a yoke 11 having a groove 13 extending in the longitudinal direction and permanent magnets arranged in the groove 13 so as to face each other via a magnetic gap. 12a, 12b. The yoke 11 is composed of a bottom member 11a and a pair of side plates 11b and 11b mounted upright from both side surfaces of the bottom member 11a, and between the opposing surfaces of the bottom member 11a and the side plates 11b and 11b. And a groove 13 is formed. The side plates 11b and 11b are fastened and fixed to the bottom member 11a with bolts or the like.

  Further, field magnets 12a and 12b are arranged to face each other on the opposing surfaces of the side plates 11b and 11b. The field magnets 12a and 12b are arranged so that the field magnets 12a and 12b having different polarities are opposed to each other, and the adjacent field magnets 12a and 12b are arranged to have different polarities. That is, the N-pole field magnet 12a and the S-pole field magnet 12b are arranged to face each other in the groove 13, and the field magnet adjacent to the N-pole field magnet 12a is the S-pole field magnet. The magnets 12b are arranged. The field magnets 12a and 12b are formed in a plate shape extending from the bottom member 11a toward the upper end surface of the side plate 11b, and the width of the field magnets 12a and 12b in the moving direction of the mover 20 is the mover 20. It is possible to change appropriately according to the thrust required for the movement.

  Further, the bottom member 11a is formed with a clearance groove 11c formed along the groove 13, and this clearance groove 11c prevents interference with a fixing means 22a formed at an end portion of a coil 21 described later. Is formed for.

  As shown in FIGS. 4 and 5, the mover 20 includes a plurality of coils 21 a, 21 a... Wound in parallel with the moving direction of the mover 20. The coils 21 are arranged. Further, the upper end portion of the coil 21 is sandwiched and fixed by the bracket 26 via the heat transfer member 27.

  Moreover, as shown in FIGS. 5-7, the coil 21a bends the edge part of the longitudinal direction of the coil wound by the ellipse which has a pair of linear part 21b to one direction orthogonal to a winding direction. The escape portion 21c is formed, and the windings on one side of the linear portions 21b of the adjacent coils 21a are arranged inside the windings so that the coils do not contact each other at the longitudinal ends of the respective coils 21a. The coil 21a is arranged by reversing the bending direction of the escape portion 21c.

  Further, as shown in FIGS. 4 and 5, side bars 23 made of stainless steel are fixed to both end faces of the coil 21 along the moving direction of the mover. Thus, the frame member of the coil 21 is formed. Furthermore, a fixing means 22a resin-molded so as to connect the lower end of the side bar 23 is formed at the lower end of the coil 21 positioned opposite to the end fixed by the bracket 26. As shown in FIG. 2, the lower end portion of the coil 21 is disposed in the escape groove 11 c, and thus is formed in a portion excluding a portion facing the field magnet 12.

  As described above, in the mover 20 according to the present embodiment, the fixing means 22a is formed in a portion excluding the portion facing the field magnet 12 of the coil 21, and therefore, compared with the case where the entire coil is resin-molded. Thus, the amount of the resin mold can be reduced, and the weight of the mover 20 can be reduced. In addition, since the resin mold is not formed on the surface of the coil 21 that faces the field magnet 12, the magnetic gap between the coil 21 and the field magnet 12 can be set small. Furthermore, since the fixing means 22a by the resin mold is formed so as to connect the lower ends of the side bars 23 that receive stress due to the high-speed movement of the mover 20, rigidity against stress accompanying acceleration / deceleration of the mover 20 is given. Yes. As described above, the mover 20 according to the present embodiment reduces the weight and improves the moving speed, while the resin mold is applied to the portion where rigidity is required, so that the moving speed is increased and the moving speed is increased. Thus, it is possible to prevent damage to the mover 20 accompanying the increase in speed.

  Further, a support member 24 as a reinforcing means is fixed to an end face in the longitudinal direction of the side bar 23 (end face in the moving direction of the mover 20). The support member 24 is also made of stainless steel, like the side bar 23. As described above, since the support member 24 is fixed to the end surface of the side bar 23 in the longitudinal direction, rigidity against stress concentrated on the side bar 23 can be imparted as the mover 20 is accelerated or decelerated.

  Further, a thin plate-like protective means 25 formed of a glass epoxy plate or the like is attached to the surface of the coil 21 that faces the field magnet 12. Thus, since the protection means is formed on the surface of the coil 21 that faces the field magnet 12, the surface that faces the field magnet 12 is made of a thin plate compared to the case where the entire coil 21 is resin-molded. 10 and the mover 20 can be protected from dust and the like entering from the gap between the mover 20 and the mover 20. Thus, the weight of the mover 20 can be reduced and the magnetic gap between the field magnet 12 and the coil 21 can be reduced.

  Next, the arrangement of the stator 10 and the mover 20 will be described with reference to FIG. 2 again.

  As shown in FIG. 2, the fixing means 22b is also formed by resin molding in the same manner as the fixing means 22a described above at the part where the coil 21 is sandwiched by the bracket 26. Thus, since the fixing means 22b is formed along the longitudinal direction of the coil 21, the resin mold has a low heat dissipation effect, so that the heat generated in the coil 21 can be efficiently conducted to the heat transfer member 27, The heat generated in the coil 21 can be efficiently cooled by heat radiating means such as a heat sink (not shown) attached to the heat transfer member 27.

  Further, as described above, the fixing means 22a and 22b are formed by resin molding on the end surface of the coil 21 facing the bottom member 11a and the end surface sandwiched by the bracket 26. Chamfers 12c and 12c are formed on the end surface of the magnet 12 in the direction orthogonal to the moving direction of the mover 20, so that the field magnet 12 and the fixing means 22a and 22b do not interfere with each other. Furthermore, the area where the coil 21 and the field magnet 12 face each other increases, and the thrust is improved.

  Although not shown, a portion where the fixing means 22a of the side bar 23 is resin-molded and a portion where the fixing means 22b of the bracket 26 is resin-molded are stepped in a direction perpendicular to the moving direction of the mover 20. Since the resin flows into the groove to form the resin mold, the fixing means 22a and 22b can be fixed more firmly.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to description of the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, in the above embodiment, the case where the fixing means is formed by a resin mold has been described. However, the fixing means may be formed using metal injection molding, or a member formed of metal or synthetic resin is attached. It doesn't matter.

  Moreover, in the said embodiment, although the case where a fixing means was formed in the both ends of the longitudinal direction of a coil was demonstrated, depending on the structure of a linear motor, you may form a fixing means only in one side.

  Moreover, in the said embodiment, although the thin plate-shaped protection means 25 was affixed and formed in the surface facing the field magnet 12 of the coil 21, this protection means 25 is abbreviate | omitted for further weight reduction. It doesn't matter.

  Furthermore, although the part which resin-molds the fixing means 22a and 22b of the side bar 23 and the bracket 26 has been described for the case where a plurality of grooves are formed in a direction orthogonal to the moving direction of the mover 20, these are formed in a groove shape. The present invention is not limited, and a plurality of recesses may be formed and a resin mold may be poured into the recesses.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

It is a perspective view which shows the coreless linear motor which concerns on this embodiment. It is a front view of the coreless linear motor which concerns on this embodiment. It is a perspective view which shows the stator of the coreless linear motor which concerns on this embodiment. It is a perspective view which shows the needle | mover of the coreless linear motor which concerns on this embodiment. It is an exploded view for demonstrating the structure of the needle | mover of the coreless linear motor which concerns on this embodiment. It is a side view for demonstrating the shape of the coil of the coreless linear motor which concerns on this embodiment. It is a side view for demonstrating the arrangement | sequence method of the coil of the coreless linear motor which concerns on this embodiment.

Explanation of symbols

  1 coreless linear motor, 10 stator, 11 yoke, 12a, 12b field magnet, 13 groove, 20 mover, 21 coil, 22a, 22b fixing means, 23 side bar, 24 support member, 25 protection means, 27 heat transfer Element.

Claims (4)

A stator,
A movable element that is movable relative to the stator;
The stator is arranged with a yoke having a groove extending in a longitudinal direction and a magnetic gap in the groove so as to be opposed to each other so as to have different polarities and adjacent polarities to be different from each other. Field magnets,
In the coreless linear motor disposed in the magnetic gap, the mover includes a plurality of coils arranged in parallel and a bracket that sandwiches the upper end portions of the plurality of coils via a heat transfer member .
A fixing means formed on a portion of the coil excluding the portion facing the field magnet ;
The fixing means is formed at a portion where the bracket sandwiches the plurality of coils, and a first fixing means formed at a lower end portion opposite to an upper end portion fixed by the bracket of the plurality of coils. Second fixing means,
Said fixing means, coreless linear motor characterized that you have been formed by a portion other than the portion facing the field magnet of the coil to the resin molding. The coreless linear motor according to claim 1 ,
The mover comprises a coreless linear motor comprising reinforcing means for the coil on both end faces in the moving direction. In the coreless linear motor according to claim 1 or 2 ,
A coreless linear motor characterized in that a portion of the coil facing the field magnet is provided with a thin plate-like protection means. The coreless linear motor according to any one of claims 1 to 3 ,
The coreless linear motor, wherein the field magnet has a chamfered end face in a direction orthogonal to the moving direction of the mover.

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