JP2015173536A - Armature for linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature for which cooling by a cooling pipe is appropriately controlled.SOLUTION: An armature 40 is arranged while being spaced apart from a field magnet. The armature 40 includes: an armature core 41 including a yoke part 42 extending in a direction X and a plurality of teeth 43g, 43h and 43i protruding therefrom to the side of the field magnet; coils 49g, 49h and 49i wound around the teeth 43g, 43h and 43i, respectively; and a cooling pipe in which a coolant flows. A core cooling part 61h is housed in a groove 51h, a core cooling part 61i is housed in a groove 51i, and the grooves 51h and 51i are formed in such a manner that a length direction thereof is turned in a Z direction. A distance P between a center of the groove 51h and a center of the groove 51i is different from a distance D between a center of the core cooling part 61h and a center of the core cooling part 61i.

Description

  The present invention relates to an armature used as a stator or a mover of a linear motor.

  An armature used for a linear motor includes an armature core and a coil. The armature core has a plurality of teeth provided in the driving direction, and a coil is wound around the teeth. When the coil generates heat when energized, the temperature of the armature core increases, which may adversely affect the performance of the armature. As a countermeasure, a technique for cooling the armature core with a cooling pipe through which a refrigerant flows is known. Conventionally, for example, an armature described in Patent Document 1 has been proposed.

JP 2008-35698 A

  However, in the conventional armature for linear motors described in Patent Document 1, the cooling by the cooling pipe is not sufficiently controlled, and there is room for improvement.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an armature in which cooling by a cooling pipe is accurately controlled.

  In order to solve the above-mentioned problems, an armature for a linear motor according to an aspect of the present invention is an armature that is spaced apart from a field element, and a yoke portion that extends in a motor driving direction and the armature A core including a plurality of teeth portions protruding toward the field element side, a coil wound around the teeth portions, and a cooling pipe through which a coolant flows are provided. A plurality of grooves are formed on the surface of the yoke portion opposite to the coil, the first groove of the plurality of grooves accommodates the first portion of the cooling pipe, and the second of the plurality of grooves. The second portion of the cooling pipe is accommodated in the groove, and the first groove and the second groove are formed so that the respective longitudinal directions thereof are substantially in the same direction, and the center of the first groove and the second groove are formed. The distance from the center of is different from the distance between the center of the first part and the center of the second part.

  Another aspect of the present invention is also a linear motor armature. This armature for a linear motor is an armature that is spaced apart from a field element, and includes a yoke portion that extends in the motor driving direction and a plurality of teeth portions that project from the yoke portion to the field element side. A core including the coil wound around the tooth portion, and a cooling pipe through which the refrigerant flows. A plurality of grooves are formed on the surface of the yoke portion opposite to the coil so that the longitudinal directions thereof are substantially in the same direction, and each of the two adjacent grooves among the plurality of grooves has a first cooling tube. The first portion and the second portion of the cooling pipe are accommodated, and the distance between the centers of the first portion and the second portion is shorter than the pitch of the plurality of grooves.

  Yet another embodiment of the present invention is also an armature for a linear motor. This armature for a linear motor is an armature that is spaced apart from a field element, and includes a yoke portion that extends in the motor driving direction and a plurality of teeth portions that project from the yoke portion to the field element side. A core including the coil wound around the tooth portion, and a cooling pipe through which the refrigerant flows. A plurality of grooves are formed on the surface of the yoke portion opposite to the coil, and a first portion of the cooling pipe is accommodated in the first groove of the plurality of grooves, and the first of the plurality of grooves is accommodated. The second groove adjacent to the groove accommodates the second portion of the cooling pipe, and the first groove and the second groove are formed so that the longitudinal directions thereof are substantially in the same direction. Is accommodated at a position close to the inner wall of the first groove on the second groove side, and the second portion is accommodated at a position close to the inner wall of the second groove on the first groove side.

  Yet another embodiment of the present invention is also an armature for a linear motor. This armature for a linear motor is an armature that is spaced apart from a field element, and includes a yoke portion that extends in the motor driving direction and a plurality of teeth portions that project from the yoke portion to the field element side. A core including the coil wound around the tooth portion, and a cooling pipe through which the refrigerant flows. A plurality of grooves are formed on the surface of the yoke portion opposite to the coil, the first groove of the plurality of grooves accommodates the first portion of the cooling pipe, and the second of the plurality of grooves. The groove accommodates the second portion of the cooling pipe, and the distance in the direction perpendicular to the motor driving direction between the first portion and the coil is the distance in the direction perpendicular to the motor driving direction between the second portion and the coil. And different.

  According to the present invention, it is possible to provide an armature in which the cooling by the cooling pipe is accurately controlled.

It is sectional drawing which shows the linear motor with which the armature which concerns on 1st Embodiment is used. It is a perspective view which shows the armature of FIG. It is an expanded sectional view which expands and shows a part of FIG. It is sectional drawing which shows the linear motor with which the armature which concerns on 2nd Embodiment is used.

  Hereinafter, the same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are appropriately omitted. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in the drawings, some of the members that are not important for describing the embodiment are omitted.

(First embodiment)
FIG. 1 is a cross-sectional view showing a linear motor 10 in which an armature 40 according to the first embodiment is used. FIG. 2 is a perspective view showing the armature 40 of FIG. FIG. 2 shows a state where the cooling pipe 60 is separated. FIG. 3 is an enlarged cross-sectional view showing a part of FIG. 1 in an enlarged manner. The linear motor 10 includes a field element 30 and an armature 40. The field element 30 is a stator, and the armature 40 is a mover.
Hereinafter, the armature 40 side as viewed from the field element 30 will be described as the upper side. Further, the driving direction of the linear motor 10 will be described as the X direction, the vertical direction as the Y direction, and the direction orthogonal to both as the Z direction.

  The field element 30 includes a field element core 31 and a plurality of magnets 33. The field element core 31 is a rectangular parallelepiped member extending in the X direction. The plurality of magnets 33 are permanent magnets. The plurality of magnets 33 may be electromagnets. The plurality of magnets 33 are provided on the upper surface 31 a of the field element core 31. In particular, the plurality of magnets 33 are provided such that different magnetic poles (N pole, S pole) are alternately arranged in the X direction.

  The armature 40 is disposed at a distance from the field element 30. The armature 40 includes an armature core 41, coils 49 a to 49 i collectively referred to as a coil 49, and a cooling pipe 60. The armature core 41 is formed by laminating a plurality of comb-like plate-like bodies 47. The plate-like body 47 is an electromagnetic steel plate. The plate-like body 47 may be another metal plate.

  The armature core 41 includes a yoke portion 42 and tooth portions 43 a to 43 i that are collectively referred to as a tooth portion 43. The yoke part 42 is a rectangular parallelepiped member extending in the X direction. The teeth part 43 protrudes from the yoke part 42 to the field element 30 side (that is, the Y direction). Slot portions 45 a to 45 j collectively referred to as the slot portion 45 are formed on both sides of the teeth portion 43 in the X direction. The teeth portions 43 and the slot portions 45 are alternately arranged in the X direction. A coil 49 is wound around each tooth portion 43, and the coil 49 is accommodated in the slot portion 45.

  Grooves 51 a to 51 j collectively referred to as the groove 51 are formed on the upper surface 42 a of the yoke portion 42. In particular, the groove 51 is formed above the slot portion 45. The groove 51 is a concave portion that penetrates the yoke portion 42 in the Z direction and has a U-shaped cross section. Each groove 51 has substantially the same shape. The grooves 51 are arranged in the X direction at a constant groove pitch P. At least a part of the cooling pipe 60 is accommodated in the groove 51.

  The cooling pipe 60 is made of a metal material such as copper. The cooling pipe 60 includes core cooling parts 61 a to 61 j that are collectively referred to as the core cooling part 61, and continuous parts 63 a to 63 i that are collectively referred to as the continuous part 63. The core cooling part 61 is provided at intervals in the X direction. In particular, the number of core cooling parts 61 corresponding to the number of grooves 51 is provided. The connecting portion 63 connects the end portions of the adjacent core cooling portions 61. The core cooling part 61 and the connecting part 63 are formed in a cylindrical shape having a circular cross section. Of course, these may be formed in a rectangular tube shape having a polygonal cross section or other shapes. The cooling pipe 60 is formed such that the core cooling part 61 and the continuous part 63 meander in a wave shape, and a continuous flow path is formed therein. The cooling pipe 60 is formed by bending a pipe body.

  Core cooling parts 61a-61j are stored in grooves 51a-51j, respectively. The core cooling units 61a to 61j are accommodated in the grooves 51a to 51j so that the distances La to Lj with the coil 49 in the Y direction are all the same. On the other hand, the core cooling parts 61g to 61j are accommodated in positions where the centers thereof deviate from the centers of the grooves 51g to 51j in the X direction. In other words, the core cooling parts 61g to 61j are accommodated at positions close to any one of the inner walls of the grooves 51g to 51j opposed in the X direction. Specifically, the core cooling part 61g is accommodated in the inner wall 52gb, the core cooling part 61h is accommodated in the inner wall 52hb, the core cooling part 61i is accommodated in the inner wall 52ia, and the core cooling part 61j is accommodated in a position close to the inner wall 52ja. That is, the core cooling parts 61g to 61j are accommodated at positions close to the inner wall on the coil 49h side. Moreover, the core cooling part 61h and the core cooling part 61i are accommodated so that the center distance D thereof is shorter than the groove pitch P of the groove 51 (that is, the center distance between the adjacent groove 51h and the groove 51i). .

  The continuous portions 63a to 61i are disposed outside the armature core 41 in the Z direction. When a coolant such as water is fed into the cooling pipe 60, the coolant flows in the Q direction from the inflow side P1 (upstream side) to the outflow side P2 (downstream side) of the flow path, and the armature is driven by the coolant in the core cooling unit 61. The core 41 is cooled.

  The operation of the linear motor 10 configured as described above will be described. A drive current is supplied to the coil 49. Thrust is generated in the armature 40 due to the interaction between the magnetic field generated by the drive current flowing through the coil 49 and the magnetic field of the magnet 33, and the armature 40 moves in the X direction. At the same time, the coolant is fed into the cooling pipe 60, whereby the armature core 41 and thus the coil 49 are cooled.

  The linear motor 10 using the armature 40 according to the embodiment has been described above. According to the armature 40 according to the present embodiment, the core cooling portion 61 around the specific coil 49 (around the coil 49h in FIG. 3) is accommodated in the groove 51 so as to be close to the coil 49. Thereby, the specific coil can be efficiently cooled. That is, by controlling the position of the core cooling unit 61 in the X direction, the cooling effect by the core cooling unit 61 can be locally increased.

(Second Embodiment)
The main difference between the armature 40 according to the first embodiment and the armature according to the second embodiment is the direction in which the core cooling unit is shifted.
FIG. 4 is a cross-sectional view showing the linear motor 110 in which the armature 140 according to the second embodiment is used. FIG. 4 corresponds to FIG.

  In the present embodiment, the core cooling parts 61a to 61j are accommodated in the grooves 51a to 51j so that the core cooling part 61 closer to the outflow side P2 of the flow path (that is, the downstream side in the refrigerant flow direction) is positioned below. The That is, the core cooling units 61a to 61j are provided such that the distances La to Lj with the coil 49 in the Y direction satisfy La> Lb> Lc> Ld> Le> Lf> Lg> Lh> Li> Lj.

  According to the armature 40 according to the present embodiment, the core cooling part 61 is accommodated in the groove 51 so that the core cooling part 61 on the downstream side in the refrigerant flow direction is positioned below. Here, the temperature of the refrigerant flowing through the cooling pipe 60 increases as it approaches the downstream side by absorbing the heat of the armature core 41. Therefore, the cooling effect by the cooling pipe 60 decreases as it approaches the downstream side. Thereby, a temperature gradient is generated in the X direction in the armature core 41, and warpage due to thermal expansion may occur. On the other hand, as described above, if the core cooling part 61 closer to the downstream side is accommodated in the groove 51 so as to be positioned below, the core cooling part 61 closer to the downstream side can be brought closer to the coil 49. Then, the closer to the outflow side, the easier the coil 49 is cooled, and as a result, the occurrence of a temperature gradient in the X direction can be reduced.

  The armature according to the embodiment has been described above. It is to be understood by those skilled in the art that these embodiments are exemplifications, and various modifications can be made to the combination of each component, and such modifications are also within the scope of the present invention.

(Modification 1)
In the first embodiment, the case where the distances La to Lj in the Y direction between the core cooling units 61a to 61j and the coil 49 are all the same has been described, but the present invention is not limited to this. For example, the core cooling units 61g to 61j may be positioned below the core cooling units 61a to 61f. That is, it may be configured to satisfy Lg to Lj <La to Lf.
(Modification 2)
In 1st and 2nd embodiment, although the case where the cross section of the groove part 51 was U-shaped was demonstrated, it is not restricted to this. The groove 51 may have a V-shaped cross section, a circular shape, an elliptical shape, a polygonal shape, or other shapes.
(Modification 3)
In the first and second embodiments, the case where the armature core 41 is a laminated core has been described, but the present invention is not limited to this. For example, the armature core 41 may be a core obtained by sintering powder such as ferrite.

(Modification 4)
In the first and second embodiments, the example in which the armature 40 according to the present invention is applied to the mover has been described. However, the armature 40 may be applied to a stator. Also when applied to the stator, the armature 40 is provided with a tooth portion 43 on the side portion of the armature core 41 facing the mover that is the field element 30, and the coil 49 is wound around the tooth portion 43. Is done.

(Modification 5)
Although the case where the armature core 41 is cooled by one cooling pipe 60 has been described in the first and second embodiments, the present invention is not limited to this. The armature core 41 may be cooled by a plurality of cooling pipes.

(Modification 6)
In the first and second embodiments, the case where the groove 51 is a concave portion penetrating the yoke portion 42 in the Z direction has been described. However, the present invention is not limited to this. The groove 51 may be a recess penetrating in the X direction or a recess penetrating in a direction intersecting the X direction and the Z direction.
(Modification 7)
In the first and second embodiments, the case where the groove 51 is formed above the slot portion 45 has been described. However, the present invention is not limited to this. The groove 51 may be formed above the tooth portion 43 instead of or above the slot portion 45. Since the contact area between the coil 49 and the tooth part 43 is larger than the contact area between the coil 49 and the yoke part 42, most of the heat generated by the coil 49 is transmitted to the tooth part 43. Therefore, according to the present modification, the cooling pipe 60 is disposed above the teeth portion 43, that is, at a position closer to the teeth portion 43. Therefore, the heat generated by the coil 49 can be cooled more efficiently.

  Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiment generated by the combination has the effects of the combined embodiment and the modified examples.

  10 linear motor, 30 field element, 33 magnet, 40 armature, 41 armature core, 42 yoke part, 43 teeth part, 49 coil, 51 groove, 60 cooling pipe.

Claims (6)

An armature that is spaced apart from the field element,
A core including a yoke portion extending in the motor driving direction and a plurality of teeth portions projecting from the yoke portion to the field element side;
A coil wound around the teeth portion;
A cooling pipe through which the refrigerant flows,
A plurality of grooves are formed on the surface of the yoke portion opposite to the coil,
The first groove of the plurality of grooves accommodates a first portion of the cooling pipe,
The second groove of the plurality of grooves accommodates a second portion of the cooling pipe,
The first groove and the second groove are formed such that the respective longitudinal directions face substantially the same direction,
The distance between the center of the first groove and the center of the second groove is different from the distance between the center of the first portion and the center of the second portion. Child. The second groove is adjacent to the first groove;
2. The linear according to claim 1, wherein a distance between the center of the first portion and the center of the second portion is shorter than the center of the first groove and the center of the second groove. Armature for motor. An armature that is spaced apart from the field element,
A core including a yoke portion extending in the motor driving direction and a plurality of teeth portions projecting from the yoke portion to the field element side;
A coil wound around the teeth portion;
A cooling pipe through which the refrigerant flows,
A plurality of grooves are formed on the surface of the yoke portion on the opposite side of the coil so that the longitudinal directions thereof are substantially in the same direction,
Each of two adjacent grooves among the plurality of grooves accommodates a first portion of the cooling pipe and a second portion of the cooling pipe,
The linear motor armature, wherein a distance between centers of the first portion and the second portion is shorter than a pitch of the plurality of grooves. An armature that is spaced apart from the field element,
A core including a yoke portion extending in the motor driving direction and a plurality of teeth portions projecting from the yoke portion to the field element side;
A coil wound around the teeth portion;
A cooling pipe through which the refrigerant flows,
A plurality of grooves are formed on the surface of the yoke portion opposite to the coil,
The first groove of the plurality of grooves accommodates a first portion of the cooling pipe,
A second portion of the plurality of grooves adjacent to the first groove accommodates a second portion of the cooling pipe,
The first groove and the second groove are formed such that the respective longitudinal directions face substantially the same direction,
The first portion is accommodated at a position close to the inner wall of the first groove on the second groove side,
The linear motor armature, wherein the second portion is housed in a position near the inner wall of the second groove on the first groove side. An armature that is spaced apart from the field element,
A core including a yoke portion extending in the motor driving direction and a plurality of teeth portions projecting from the yoke portion to the field element side;
A coil wound around the teeth portion;
A cooling pipe through which the refrigerant flows,
A plurality of grooves are formed on the surface of the yoke portion opposite to the coil,
The first groove of the plurality of grooves accommodates a first portion of the cooling pipe,
The second groove of the plurality of grooves accommodates a second portion of the cooling pipe,
The distance between the first portion and the coil in the direction orthogonal to the motor driving direction is different from the distance between the second portion and the coil in the direction orthogonal to the motor driving direction. Armature. The second part is provided downstream of the first part in the flow direction of the refrigerant,
The distance between the second portion and the coil in a direction orthogonal to the motor driving direction is shorter than the distance between the first portion and the coil in the direction orthogonal to the motor driving direction. The armature for linear motors as described in 3.

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