JP3717446B2 - Linear motor armature and linear motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear motor armature and a linear motor.
[0002]
[Prior art]
Linear having an armature core having a yoke and a plurality of magnetic pole portions connected to the yoke, and a plurality of winding portions wound respectively around the magnetic pole portions arranged alternately along the yoke among the plurality of magnetic pole portions Motor armatures are known. Usually, in this type of armature for a linear motor, a yoke and a plurality of magnetic pole portions are integrally formed.
[0003]
[Problems to be solved by the invention]
However, in such a conventional armature for a linear motor, depending on the shape of the magnetic pole portion, a winding portion formed by winding a winding conductor around a bobbin could not be inserted into the magnetic pole portion. When the insertion is impossible, a winding conductor is wound around the magnetic pole portion to form the winding portion. However, when the slot width between the magnetic pole portions is narrow, it is difficult to insert the winding nozzle, so that the number of windings cannot be increased.
[0004]
The objective of this invention is providing the armature for linear motors which can form a coil | winding part in a magnetic pole part easily.
[0005]
Another object of the present invention is to provide an armature for a linear motor that can prevent a divided magnetic pole portion from being fitted to a yoke in a wrong direction.
[0006]
Another object of the present invention is to provide an armature for a linear motor that can easily increase or decrease thrust by configuring an armature core with a plurality of divided core units.
[0007]
Another object of the present invention is to provide an armature for a linear motor that can suppress an increase in cogging even if the armature core is composed of a plurality of divided core units.
[0008]
Another object of the present invention is to provide a linear motor capable of obtaining a larger thrust.
[0009]
[Means for Solving the Problems]
The linear motor armature to be improved by the present invention includes a linearly extending yoke and a magnetic pole part array that is arranged at predetermined intervals along the yoke and includes a plurality of magnetic pole parts extending from the yoke. An armature core and a plurality of winding portions respectively wound around a plurality of magnetic pole portions arranged alternately along the yoke among the plurality of magnetic pole portions constituting the magnetic pole portion row. In the present invention, among the plurality of magnetic pole portions, the magnetic pole portion around which the winding portion is not wound is integrally formed with the yoke, and the plurality of magnetic pole portions arranged every other time around which the winding portion is wound is defined as the yoke. It consists of a split magnetic pole part formed separately. If the magnetic pole part around which the winding part is wound is constituted by a divided magnetic pole part formed separately from the yoke as in the present invention, the winding part is wound around each divided magnetic pole part and then divided. The armature can be formed by coupling the magnetic pole portion to the yoke. Therefore, the magnetic pole part can be easily wound regardless of the shape of the magnetic pole part and the size of the slot. In particular, even a magnetic pole portion that is difficult to wind, such as a high-density magnetic pole portion, can be easily wound. The winding portion may be formed by winding a winding conductor around a bobbin in advance, and in that case, the winding portion is inserted into the divided magnetic pole portion. Further, the winding part may be formed by winding a winding conductor around the divided magnetic pole part.
[0010]
An armature for a linear motor according to another invention of the present application is targeted for improvement with an armature for a linear motor having two magnetic pole part rows arranged on both sides of a yoke. Such an armature for a linear motor includes a linearly extending yoke and two magnetic pole part rows that are arranged on both sides of the yoke at a predetermined interval along the yoke and are composed of a plurality of magnetic pole parts extending from the yoke. An armature core, and a plurality of winding portions respectively wound around a plurality of magnetic pole portions arranged alternately along the yoke among the plurality of magnetic pole portions respectively constituting the two magnetic pole portion rows. Yes. In this case, out of the plurality of magnetic pole parts constituting the two magnetic pole part rows, the magnetic pole part around which the winding part is not wound is formed integrally with the yoke, and arranged every other part where the winding part is wound. The plurality of magnetic pole portions are composed of divided magnetic pole portions formed separately from the yoke.
[0011]
The coupling structure of the yoke and the divided magnetic pole part is arbitrary. However, if they are coupled via a fitting structure that is not separated by the electromagnetic force generated when the linear motor is in operation, the yoke and the split magnetic pole can be coupled only by fitting work, making assembly easy. It is.
[0012]
Such a fitting structure can be composed of, for example, a fitted part formed on the yoke and a fitting part formed on the divided magnetic pole part. In this case, the fitted portion can be a groove whose width is reduced as it goes in the direction in which the divided magnetic pole portion extends, and the fitting portion can be a convex portion that is tightly fitted in the groove. In this way, even if the magnetic attractive force generated between the permanent magnets arranged on the stator side acts on the split magnetic pole part, the split magnetic pole part does not fall off from the yoke.
[0013]
The fitting part of the split magnetic pole part and the fitted part of the yoke include the center line of the split magnetic pole part extending in the longitudinal direction of the split magnetic pole part, and the split magnetic pole part perpendicular to the center line of the yoke extending in the longitudinal direction of the yoke It is preferable to form an asymmetric shape with respect to the virtual center plane. If it does in this way, the fitting direction of the division | segmentation magnetic pole part with respect to a yoke will be limited to one direction. Therefore, when the direction of the divided magnetic pole part with respect to the yoke needs to be limited to a specific direction by the configuration of the wiring of the winding part or the like, it is possible to prevent the divided magnetic pole part from being fitted to the yoke in the wrong direction. it can.
[0014]
The armature core can be composed of a plurality of divided core units that are fitted to each other through a fitting structure on the divided surface. In this way, it is possible to easily increase or decrease the thrust. In this case, it is preferable to form a plurality of split core units so that the split surface is formed at a position where the magnetic pole portion around which the winding portion is not wound is split into two in the direction in which the magnetic pole row extends. If the split surface is formed at a position of the yoke other than the magnetic pole part, the area of the split surface (that is, the joint surface of the split core unit) is reduced, the armature core is likely to be bent, and the slot pitch cumulative error increases. Cogging increases, but if a split surface is formed at the position where the magnetic pole part is split in two, the area of the split surface (that is, the joint surface of the split core unit) increases, and this increase in cogging is suppressed. can do. In this case, since the magnetic pole portion around which the winding portion is not wound is integrally formed with the yoke, a split surface is formed at the magnetic pole portion where the winding portion is not wound around.
[0015]
Moreover, since such an armature core is easy to generate | occur | produce heat, it is preferable to arrange | position water cooling piping in the slot formed between two adjacent magnetic pole parts.
[0016]
A linear motor using an armature according to the present invention includes a mover and a stator having two permanent magnet rows each composed of a plurality of permanent magnets arranged in rows and facing two magnetic pole portion rows. It has. In this case, the dimension τp between the magnetic centers of two adjacent permanent magnets included in the permanent magnet row and the dimension τs between the magnetic centers of two adjacent magnetic pole portions included in the magnetic pole row are: It is preferable to set the relationship of τp: τs = 6n: (6n−1) (n is a natural number). By setting in this way, a larger thrust can be obtained.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of the linear motor according to the present embodiment, FIG. 2 is a partially cutaway view of the linear motor shown in FIG. 1 from a plan view, and FIG. 3 is a diagram of the linear motor shown in FIG. It is the partially broken view which looked at the armature to be used from the side. In order to facilitate understanding, in FIG. 2, the upper right part shows a view in which the first side block member 13 and the cover member 17 are removed, and the lower right part shows the first side block member 13. The cross section of the armature 11 for linear motors located below is shown. As shown in FIG. 1, the linear motor includes a stator 1 and a mover 3 movable with respect to the stator 1. The stator 1 has a base 1A and a pair of wall portions 1B and 1C arranged in parallel on the base 1A. As shown in FIG. 2, a magnetic pole row in which a plurality of permanent magnets 7a and 7b are arranged is arranged on the wall 1B, and a magnetic pole row in which a plurality of permanent magnets 9a and 9b are arranged on the wall 1C. Has been placed. The permanent magnets 7a and 7b are arranged so that permanent magnets 7a whose magnetic poles located on the side of the mover 3 are N poles and permanent magnets 7b whose magnetic poles located on the side of the mover 3 are S poles are alternately positioned. Yes. Similarly to the permanent magnets 7a and 7b, the permanent magnets 9a and 9b include a permanent magnet 9a whose magnetic pole located on the mover 3 side is an N pole and a permanent magnet 9b whose magnetic pole located on the mover 3 side is an S pole. They are lined up alternately. These wall portions 1B and 1C are respectively attached to the base 1A so that their magnetic pole rows face each other.
[0018]
The mover 3 includes a linear motor armature 11, first and second side surface block members 13, 15, and a cover member 17 disposed on the first side surface block member 13. The cover member 17 and the wall portions 1B and 1C have support means (not shown) for supporting the cover member 17 on the wall portions 1B and 1C, and the movable element 3 moves relative to the stator 1 by this support means. Supported as possible. Such a support means is configured by, for example, providing a rotating body and a bearing portion of the rotating body on one of the cover member 17 and the wall portions 1B and 1C, and providing a rail portion for guiding the rotating body on the other. Can do. The first and second side surface block members 13 and 15 are plate-like block members, respectively, and are arranged above and below the linear motor armature 11 so as to sandwich the linear motor armature 11. The first and second side surface block members 13 and 15 are respectively provided on a surface facing the linear motor armature 11 and a part of a winding portion 19 and a cooling pipe 21 described later (projecting from the linear motor armature 11). The portion excluding the concave portion is in contact with the linear motor armature 11. And the 1st and 2nd side surface block members 13 and 15 are being fixed with respect to the armature 11 for linear motors with the screw which penetrates the through-hole 29a etc. which are shown in FIG.
[0019]
The linear motor armature 11 includes an armature core 18, a plurality of winding portions 19, and a water-cooled pipe 21. The armature core 18 is configured by combining a plurality of divided core units 23. One split core unit 23 has a unit main body 25 shown in FIG. 4 and a split magnetic pole portion 27 that can be fitted to the unit main body 25 as shown in FIG. The unit body 25 is configured by laminating a plurality of steel plates, and includes a divided yoke 29, a plurality of integrated magnetic pole portions 31... Integrally formed with the divided yoke 29, and four integrated magnetic pole portion halves 33 </ b> A to 33 </ b> D. Have. The split yoke 29 is formed so as to extend linearly, and through holes 29a are respectively formed in portions corresponding to the integrated magnetic pole portions 31 ..., and portions corresponding to the integrated magnetic pole portion half portions 33A to 33D. Is formed with a through-hole half 29b. As described above, the first and second side surface block members 13 and 15 are fixed to the linear motor armature 11 in the through holes 29a and the through holes formed by the through hole half portions 29b. The screw to be penetrated.
[0020]
The integrated magnetic pole portion 31 is disposed on both sides of the divided yoke 29 at a predetermined interval along the divided yoke 29 and constitutes a non-winding magnetic pole portion on which the winding portion 19 is not wound. Each of the integrated magnetic pole half portions 33 </ b> A to 33 </ b> D is disposed on both sides and end portions of the split yoke 29, and has a structure that can be fitted to the other unit main body 25 or the end block 35. Specifically, a fitting structure including a convex portion 33a and a concave portion 33b is formed in each of the integrated magnetic pole half portions 33A to 33D. The convex portion 33a protrudes from the dividing surface 25a of the unit body 25 in the longitudinal direction of the dividing yoke 29, and has a trapezoidal shape whose width increases as the distance from the dividing surface 25a increases. The recess 33b is open in the end surface 25a and the thickness direction of the unit main body 25, and has a shape that can be fitted to the protrusion 33a. A plurality of unit main bodies are formed by fitting the concave portions 33b and the convex portions 33a of the other unit main body 25 adjacent to the convex portions 33a and the concave portions 33b or the concave portions 35b and the convex portions 35a (see FIG. 2) of the end block 35, respectively. 25 and the end block 35 are combined to form the armature core 18. And, by configuring the armature core 18 in this way, the yokes 18a of the armature core 18 are configured by combining the divided yokes 29 of the plurality of unit main bodies 25. The integral magnetic pole part is constituted by the part halves (33A, 33C) (33B, 33D).
[0021]
The divided magnetic pole portion 27 is fitted between the adjacent integrated magnetic pole portions 31 and 31 of the divided yoke 29 and between the integrated magnetic pole portion 31 located on the end side and each of the integrated magnetic pole portion half portions (33A to 33D). A fitted portion 37 is formed. The fitted portion 37 is formed by a groove that opens in a thickness direction of the divided yoke 29 and a direction in which a divided magnetic pole portion 27 described later extends. The groove forming the fitted portion 37 is continuous with the first fitted portion 37a having a trapezoidal shape whose width is reduced in the direction in which the divided magnetic pole portion 27 extends, and the first fitted portion. And a second fitted portion 37b that opens in the direction in which the divided magnetic pole portion 27 extends. A triangular protrusion 37c protruding into the second fitted portion 37b is formed on one side of the second fitted portion 37b.
[0022]
As shown in FIG. 5, the divided magnetic pole portion 27 is configured by laminating a plurality of steel plates, and constitutes a wound magnetic pole portion around which the winding portion 19 is wound. As described above, since the fitted portion 37 is formed between the adjacent integrated magnetic pole portions 31 and 31 of the divided yoke 29, the divided magnetic pole portion 27 is disposed between the integrated magnetic pole portions 31 and 31. It will be. For this reason, the wound magnetic pole portions (divided magnetic pole portions 27) around which the winding portions are wound are arranged alternately along the yoke 18a among the plurality of magnetic pole portions 27 and 31. The divided magnetic pole portion 27 has a shape that is the same shape as the integrated magnetic pole portion 31 in a state of being fitted to the unit main body 25, and is fitted to the fitted portion 37 of the unit main body 25. A portion 27a is provided at the end. The fitting portion 27a is a convex portion that is tightly fitted to the fitted portion 37, and includes a trapezoidal first fitting portion 27b that fits the first fitted portion 37a, and a second covered portion. And a second fitting portion 27c fitted to the fitting portion 37b. On one side of the second fitting portion 27c, a triangular recess 27d into which the protrusion 37c of the fitted portion 37 is fitted is formed. Thus, since the projection part 37c is formed in the unit main body 25, and the recessed part 27d is formed in the division | segmentation magnetic pole part 27, as shown in FIG. 4, the fitting part 27a of the division | segmentation magnetic pole part 27 and the unit main body 25 of FIG. The fitted portion 37 includes the center line of the divided magnetic pole portion 27 extending in the longitudinal direction of the divided magnetic pole portion 27 and the virtual center of the divided magnetic pole portion 27 orthogonal to the center line of the divided yoke 29 extending in the longitudinal direction of the divided yoke 29. The shape is asymmetric with respect to the surface F. Therefore, even if it is necessary to limit the orientation of the divided magnetic pole portion 27 with respect to the divided yoke 29 to a specific direction due to the configuration of the wiring of the winding portion 19, the divided magnetic pole portion 27 is fitted to the divided yoke 29 in the wrong direction. Can be prevented. In this example, the fitting structure which couple | bonds the unit main body 25 and the division | segmentation magnetic pole part 27 is comprised by the to-be-fitted part 37 and the fitting part 27a. With such a fitting structure, the yoke 18a and the split magnetic pole portion 27 are coupled so as not to be separated by electromagnetic force generated when the linear motor is in an operating state. In addition, as shown in FIG. 2, the dimension τp between the magnetic center lines Cp and Cp of each of the adjacent permanent magnets (7 a and 7 b) (9 a and 9 b) and the two adjacent magnetic pole portions 27. , 31 is set so as to have a relationship of τp: τs = 12: 11 between the magnetic center lines Cs and Cs of the magnetic pole portions. These dimensions τp and τs may be set so as to have a relationship of τp: τs = 6n: (6n−1) (n is a natural number). Further, in the slot formed between the two adjacent magnetic pole portions 27 and 31 located at the base of the divided magnetic pole portions 27 and the integrated magnetic pole portions 31 on the yoke 18a side, the water cooling pipe 21 is arranged in a zigzag folded state. ing.
[0023]
In this example, since the winding magnetic pole part is constituted by the divided magnetic pole part 27 formed separately from the yoke 18a, the divided magnetic pole part is inserted after the winding part 19 is inserted into each of the divided magnetic pole parts 27. 27 can be coupled to the yoke 17a to form the armature 11. Therefore, the high-density winding portion 19 can be easily inserted into the magnetic pole portion 27 regardless of the shape of the magnetic pole portion 27 and the size of the slot.
[0024]
In this example, the armature for a linear motor has two magnetic pole part rows arranged on both sides of the yoke. However, the linear motor electric machine has one magnetic pole part row arranged on one side of the yoke. Of course, the present invention can also be applied to the child.
[0025]
【The invention's effect】
According to the present invention, the magnetic pole part around which the winding part is wound is composed of the divided magnetic pole part formed separately from the yoke, so that the winding part is wound around each divided magnetic pole part and then divided. The armature can be formed by coupling the magnetic pole portion to the yoke. Therefore, the magnetic pole part can be easily wound regardless of the shape of the magnetic pole part and the size of the slot. In particular, even a magnetic pole portion that is difficult to wind, such as a high-density magnetic pole portion, can be easily wound.
[Brief description of the drawings]
FIG. 1 is a front view of a linear motor according to an embodiment of the present invention.
FIG. 2 is a partially cutaway view of the linear motor shown in FIG.
FIG. 3 is a partially cutaway view of an armature used in the linear motor shown in FIG. 1 as viewed from the side.
4 is a plan view of a unit main body used in the linear motor shown in FIG. 1. FIG.
5 is a plan view of a divided magnetic pole portion used in the linear motor shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator 3 Mover 7a, 7b, 9a, 9b Permanent magnet 11 Linear motor armature 18 Armature core 19 Winding part 21 Cooling pipe 23 Split core unit 25a Split surface 27 Split pole part 27a Fitting part 33a, 33b Fitting structure 37 Fitted part F Virtual center plane Cp Magnetic pole part center line Cs Permanent magnet center line

Claims (8)

An armature core having a linearly extending yoke and a magnetic pole part array that is arranged at predetermined intervals along the yoke and includes a plurality of magnetic pole parts extending from the yoke;
A linear motor armature having a plurality of winding portions respectively wound around a plurality of magnetic pole portions arranged alternately along the yoke among the plurality of magnetic pole portions constituting the magnetic pole portion row; ,
Of the plurality of magnetic pole portions, the magnetic pole portion around which the winding portion is not wound is configured integrally with the yoke, and the plurality of magnetic pole portions arranged in the alternate manner around which the winding portion is wound, The armature for linear motors which consists of a division | segmentation magnetic pole part formed separately from the said yoke. An armature core having a linearly extending yoke and two magnetic pole part rows that are arranged on both sides of the yoke at a predetermined interval along the yoke and are composed of a plurality of magnetic pole parts extending from the yoke;
An armature for a linear motor having a plurality of winding portions respectively wound around a plurality of magnetic pole portions arranged alternately along the yoke among the plurality of magnetic pole portions respectively constituting the two magnetic pole portion rows. Because
Of the plurality of magnetic pole parts constituting the two magnetic pole part rows, the magnetic pole part on which the winding part is not wound is formed integrally with the yoke, and the one on which the winding part is wound. The linear motor armature, wherein the plurality of magnetic pole portions arranged in a row are composed of divided magnetic pole portions formed separately from the yoke. The linear motor armature according to claim 1, wherein the yoke and the divided magnetic pole portion are coupled via a fitting structure that is not separated by an electromagnetic force generated when the linear motor is in an operating state. . The fitting structure includes a fitted portion formed on the yoke and a fitting portion formed on the split magnetic pole portion,
The linear portion according to claim 3, wherein the fitted portion includes a groove having a width that decreases in a direction in which the divided magnetic pole portion extends, and the fitting portion includes a convex portion that is tightly fitted in the groove. Armature for motor. The fitting part and the fitted part include the center line of the split magnetic pole part extending in the longitudinal direction of the split magnetic pole part and the split magnetic pole part orthogonal to the center line of the yoke extending in the longitudinal direction of the yoke The armature for linear motors of Claim 4 currently formed in the asymmetrical shape with respect to this virtual center plane. An armature core having a linearly extending yoke and a magnetic pole part array that is arranged at predetermined intervals along the yoke and includes a plurality of magnetic pole parts extending from the yoke;
A plurality of winding portions respectively wound around a plurality of magnetic pole portions arranged alternately every other along the yoke among the plurality of magnetic pole portions constituting the magnetic pole portion row;
The armature core is a linear motor armature composed of a plurality of split core units fitted via a fitting structure on a split surface,
The plurality of split core units are formed so that the split surface is formed at a position where the magnetic pole portion that is not wound by the winding portion is split into two in the direction in which the magnetic pole row extends.
The split core unit includes a plurality of magnetic pole portions, in which the magnetic pole portion around which the winding portion is not wound is configured integrally with the yoke, and the plurality of magnetic pole portions arranged in every other portion around which the winding portion is wound. An armature for a linear motor, wherein the magnetic pole part is composed of a split magnetic pole part formed separately from the yoke. The armature for linear motors according to any one of claims 1 to 6, wherein a water-cooled pipe is disposed in a slot formed between two adjacent magnetic pole portions. A mover comprising the armature for a linear motor according to claim 2;
A linear motor comprising a plurality of permanent magnets arranged in rows, and having a stator having two permanent magnet rows facing the two magnetic pole portion rows,
A dimension τp between each of the two adjacent permanent magnets included in the permanent magnet row and a dimension τs between the magnetic centers of the two adjacent pole portions included in the magnetic pole row. , Τp: τs = 6n: (6n−1) (n is a natural number).

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