JP2009254177A - Motor stator and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a low priced/high power efficiency-motor stator capable of isotropically controlling eddy current. <P>SOLUTION: The motor stator that is disposed as opposed to a moving member where a plurality of planar members 11 composed of magnetic bodies are spread and arranged in parallel with an opposite surface S to a moving member including a stator body 10 that is laminated at a predetermined height towards the opposite surface S and a columnar member 2 that has a saturated magnetic flux density bigger than that of the planar member, is supported by the stator body 10, protrudes up to the opposite surface S, and is disposed so as to be of a certain pitch in the dimensional direction is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor stator having teeth formed on a surface facing a mover, and a motor including such a stator.

  FIG. 8 is a diagram showing a conventional planar motor. FIG. 8A is a plan view of the stator. FIG. 8B is a cross-sectional view of the stator and the mover.

  The planar motor includes a stator 100 that is fixed on the surface plate 200 and a mover 500 that is floated on the stator 100. A movable object whose position is to be changed by driving a planar motor is mounted on the mover 500. A large number of stator teeth 102 are formed in a lattice pattern on the surface of the stator 100 facing the mover 500. The tooth gap between the stator teeth 102 is filled with a nonmagnetic material 101 such as resin. The surface of the surface of the stator 100 facing the mover 500 is smoothly finished.

  The mover 500 includes a salient pole 501. An exciting coil 504 is wound around the salient pole 501. Movable teeth 502 are formed on the surface of the salient pole 501 facing the stator 100. The tooth gap between the mover teeth 502 is filled with a non-magnetic material 503. Further, the gap between the salient poles 501 is also filled with a non-magnetic material 503. The surface of the surface of the mover 500 facing the stator 100 is smoothly finished. The interval between the adjacent salient poles 501 is set so that the relative positions of the mover teeth 502 and the stator teeth 102 differ according to the number of excitation phases.

  The mover 500 is provided with an ejection port (not shown) that ejects compressed air toward the stator 100. An air bearing is formed between the stator 100 and the mover 500 by the compressed air. The mover 500 floats on the stator 100 with a gap δg by an air bearing.

  Φ is a magnetic flux generated by the exciting coil 504. The magnetic flux Φ enters the stator 100 from the salient pole 501 through the gap δg, passes through the stator 100, and returns to the mover 500 from the adjacent salient pole 501 through the gap δg. At this time, the mover 500 is moved by the magnetic attractive force generated between the mover tooth 502 and the stator tooth 102.

  When moving the movement target of the planar motor in the two-dimensional direction of the X-axis direction and the Y-axis direction, the mover having the structure shown in FIG. 8B is divided into the X-axis direction and the Y-axis direction. Provide. When moving in the X axis direction, the mover for the X axis direction is driven, and when moving in the Y axis direction, the mover for the Y axis direction is driven.

  FIG. 9 is a view showing the structure of the stator 100. 9A is a plan view of the stator 100, FIG. 9B is a cross-sectional view of the stator 100 in the Y-axis direction, and FIG. 9C is a cross-sectional view of the stator 100 in the X-axis direction. is there.

  The stator 100 has a laminated structure in which magnetic thin plates (for example, a plate thickness of 1 mm or less) 100a are laminated in the Y-axis direction. The following Patent Document 1 describes a stator having such a structure.

  The stator 100 is manufactured by the following procedure. First, a large number of magnetic thin plates having an elongated rectangular shape whose surface is covered with an insulating film are prepared. By laminating these magnetic thin plates, a laminated body is formed in which the plate streaks composed of the long sides of the magnetic thin plates provide the necessary area as a stator of a flat motor. In the formed laminate, one surface of the long plate of the magnetic thin plate is defined as the upper surface, and the opposite surface is defined as the lower surface. A lattice-like tooth 102 is formed on the upper surface of the laminate by groove processing, and the tooth groove is filled with the nonmagnetic material 101. Since the laminated body has irregularities and warping on the surface due to the adhesive disorder of the adhesive used when laminating the magnetic thin plates, the finishing process is finally performed to smooth the upper and lower surfaces of the laminated body. .

  The reason why the stator 100 is formed by stacking the magnetic thin plates 100a in this way is to suppress eddy current loss that occurs due to magnetic flux change or movement of the mover 500. Eddy current loss is energy loss caused by eddy current. As the magnetic flux Φ passes through the stator 100, an eddy current is generated inside the stator 100. When the eddy current is generated, the stator 100 generates heat due to the resistance of the stator 100 itself. Further, when an eddy current is generated, a thrust is generated in the mover 500 in the direction opposite to the moving direction, and acts as a braking force for the mover 500. Thus, the eddy current consumes extra power to move the mover 500 and causes the power efficiency of the motor to decrease.

  Note that the magnetic flux concentrates on the portion that becomes the stator teeth 102. In order to obtain a motor with high thrust, the magnetic thin plate 100a is made of a material having a high magnetic flux saturation density (for example, CoFe type).

JP2007-221950A

  However, although the stator formed of the laminate laminated in the Y-axis direction as described above can suppress the eddy current generated by the X-axis direction mover, the Y-axis direction mover is generated. The eddy current that is generated cannot be suppressed.

FIG. 10 is an explanatory diagram showing eddy currents generated in the stator 100. 10A is a plan view of the stator 100, FIGS. 10B and 10E are cross-sectional views of the stator 100 in the X-axis direction, and FIGS. 10C and 10D are the stator 100. FIG. It is sectional drawing of the Y-axis direction.
500X is a mover for the X-axis direction, 500Y is a mover for the Y-axis direction, Φx is a magnetic flux generated by the excitation coil of the mover 500X, Φy is a magnetic flux generated by the excitation coil of the mover 500Y, and Iex is a magnetic flux Φx. Is an eddy current generated by the magnetic flux Φy.

  First, an eddy current generated by the mover 500X will be described. As shown in FIGS. 10A and 10B, the magnetic flux Φx passes through the stator 100 in the X-axis direction. Then, the loop of the eddy current Iex is generated in the ZY plane as shown in FIG. However, since the ZY plane of the stator 100 is a streak surface of each magnetic thin plate covered with an insulating coating, there is no conduction between the magnetic thin plates. Therefore, the loop of the eddy current Iex is finely divided to form a small loop that circulates in the plane of the individual magnetic thin plate, and as a result, eddy current loss is suppressed.

  Next, an eddy current generated by the mover 500Y will be described. As shown in FIGS. 10A and 10D, the magnetic flux Φy passes through the stator 100 in the Y-axis direction. Then, the loop of the eddy current Iey is generated in the XZ plane as shown in FIG. The XZ plane is a single magnetic thin plate. Therefore, the eddy current Iey can take a large loop in each magnetic thin plate, resulting in a large eddy current loss.

  Thus, the stator formed of the laminated body laminated in the Y direction, that is, in one direction, can obtain an eddy current suppressing effect only in one direction, and cannot obtain an isotropic suppressing effect. Therefore, there has been a problem that the power efficiency of the motor is lowered.

  Further, in order to form a stator 100 by grooving a laminated body of magnetic thin plates as described above, it is necessary to minimize the thickness tolerance of the magnetic thin plate for convenience of grooving (Patent Document 1). reference). Magnetic thin plates require highly accurate plate thickness management, which requires very high costs. As a result, there is a problem in that the production of the magnetic thin plate and thus the stator 100 is very expensive.

  In addition, a material having a high saturation magnetic flux density tends to impair magnetic properties by machining. For this reason, there has been a problem that the magnetic properties of the magnetic thin plate are severely deteriorated when grooving is performed on the laminated body, which may reduce the power efficiency of the motor.

  An object of the present invention is to realize a stator for a motor that eliminates the problems of the prior art, isotropically suppresses eddy currents, and is low in cost and high in power efficiency. Another object of the present invention is to realize a motor with low cost and high power efficiency that can suppress eddy currents isotropically using such a stator for a motor.

In order to achieve the above object, the invention of claim 1
A stator for a motor for disposing it facing the mover,
A stator body in which a plurality of plate-like members made of a magnetic material are laid in parallel to the facing surface of the mover, and laminated to a predetermined thickness toward the facing surface;
A columnar member that has a higher saturation magnetic flux density than the plate-like member, is held by the stator body and protrudes to the opposing surface;
The columnar members are arranged to have a constant pitch in the two-dimensional direction.

The invention of claim 2
The stator for a motor according to claim 1, wherein the columnar member is inserted and held in a through hole of the stator body.

The invention of claim 3
The stator for a motor according to claim 2, wherein the through holes are formed in advance in each plate-like member, and each plate-like member is laminated while maintaining the positional relationship of the through-holes.

The invention of claim 4
The stator for a motor according to any one of claims 1 to 3, wherein a surface facing the movable element is a flat surface, the stator body is formed in a flat plate shape, and the columnar member is perpendicular to the plate surface of the stator body. It is characterized by protruding.

The invention of claim 5
The stator for a motor according to any one of claims 1 to 3, wherein a surface facing the mover is a cylindrical surface, the stator body is formed in a cylindrical shape, and the columnar member is arranged in a radial direction of the stator body. It is characterized by protruding.

The invention of claim 6
4. The motor stator according to claim 1, wherein the surface facing the mover is a spherical surface, the stator body is formed in a spherical shape, and the columnar member projects in a radial direction of the stator body. It is characterized by.

The invention of claim 7
The stator for a motor according to claim 5 or 6, wherein the columnar members are arranged so that the protruding end faces have a constant pitch in a two-dimensional direction on a plane in which the opposing surfaces are developed. .

The invention of claim 8
The stator for a motor according to any one of claims 1 to 7, wherein a space between the columnar members protruding from the stator main body is filled with a nonmagnetic material up to a surface facing the mover.

The invention of claim 9
A motor comprising the stator for a motor according to any one of claims 1 to 8 and a mover opposed to the stator for the motor.

According to the invention of claim 1,
By laminating plate-like members made of magnetic material to form a stator main body, and by arranging columnar members having a high saturation magnetic flux density in this stator main body so as to have a constant pitch,
An eddy current can be suppressed isotropically, and a motor stator with low power and high power efficiency can be realized.

According to the invention of claim 2,
Since the columnar member is inserted and held in the through hole of the stator main body, it acts like a nail for fixing the plate-shaped members on which the columnar members are stacked, and the strength of stacking the plate-shaped members is increased.

According to the invention of claim 3,
The through holes are formed in advance in each plate-like member, and each plate-like member is laminated while maintaining the positional relationship of the through-holes. Therefore, it is not necessary to form the through-holes in the plate-like member after lamination.

According to the invention of claim 4,
Since the surface facing the mover is a flat surface, the stator body is formed in a flat plate shape, and the columnar member protrudes perpendicularly from the plate surface of the stator body. A child can be realized.

According to the invention of claim 5,
Since the surface facing the mover is a cylindrical surface, the stator body is formed in a cylindrical shape, and the columnar member protrudes in the radial direction of the stator body, the motor stator suitable for a cylindrical surface motor Can be realized.

According to the invention of claim 6,
Since the surface facing the mover is a spherical surface, the stator main body is formed in a spherical shape, and the columnar member protrudes in the radial direction of the stator main body, a motor stator suitable for a spherical surface motor is provided. Can be realized.

According to the invention of claim 7,
Since the columnar members are arranged on the plane where the opposing surface is developed so that the protruding end faces have a constant pitch in the two-dimensional direction, the cylindrical surface motor can perform both rotational movement and translational movement. It is possible to realize a motor stator. In addition, a spherical surface motor can realize a motor stator that can rotate.

According to the invention of claim 8,
The space between the columnar members protruding from the stator body is filled with a non-magnetic material up to the surface facing the mover, so that insulation between the columnar members is ensured and the surface facing the mover is smooth. become.

According to the invention of claim 9,
Since the motor stator according to any one of claims 1 to 8 and the mover opposed to the motor stator are provided, eddy current can be suppressed isotropically, and the power efficiency is low. High motor can be realized.

FIG. 1 is a view showing an embodiment of a motor stator and a motor according to the present invention. 1A is a plan view of the stator 1, FIG. 1B is a sectional view of the stator 1 in the Y-axis direction, and FIG. 1C is a sectional view of the stator 1 in the X-axis direction. is there.
FIG. 2 is a diagram showing a part extracted to show the detailed structure of the motor stator and the motor shown in FIG. 2A is a detailed plan view of the stator 1, and FIG. 2B is a cross-sectional view of the stator 1 and the mover 500. In FIG. 1, the mover 500 is omitted. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

  The planar motor includes a stator 1 fixed on the surface plate 200 and a mover 500 floated on the stator 1. A large number of stator teeth 12 are formed in a lattice pattern on the surface of the stator 1 facing the mover 500. The tooth gap between the stator teeth 12 is filled with a nonmagnetic material 3 such as resin. The surface of the stator 1 facing the mover 500 (opposing surface S) is smoothly finished.

  The interval between the adjacent salient poles 501 provided in the mover 500 is set so that the relative positions of the mover teeth 502 and the stator teeth 12 differ according to the number of excitation phases.

  The mover 500 is provided with an ejection port (not shown) that ejects compressed air toward the stator 1. An air bearing is formed between the stator 1 and the mover 500 by the compressed air. The mover 500 floats on the stator 1 with a gap δg by an air bearing.

  Φ is a magnetic flux generated by the exciting coil 504. The magnetic flux Φ enters the stator 1 from the salient pole 501 through the gap δg, passes through the interior of the stator 1, and returns to the mover 500 from the adjacent salient pole 501 through the gap δg. At this time, the mover 500 is moved by the magnetic attractive force generated between the mover tooth 502 and the stator tooth 12.

  The stator 1 includes a stator body 10 in which plate-like members 11 are stacked, and a columnar member 2 that is inserted and held in the stator body 10 and serves as stator teeth 12. The stator main body 10 is fixed to the surface plate 200 in a state where most of the stator body 10 is accommodated in the surface plate 200.

  The plate member 11 is a magnetic thin plate having a rectangular planar shape as shown in FIG. The plate-like member 11 is formed of a normal electromagnetic soft iron material. The plate-like member 11 has eight rectangular through holes 11a formed in the vertical direction. The through hole 11a has a size corresponding to one tooth of the stator teeth of the stator 1, and is a square with one side dn. Each through hole 11a is formed at a constant pitch P. Further, when the plate-like members 11 are laid out in the same plane, the length of one side of the plate-like member 11 and the plate-like shape of the through-holes 11a so that all the through-holes 11a are arranged in a lattice pattern with a pitch P. The formation position on the member 11 is set. The pitch P is the tooth pitch of the stator teeth. The surface of the plate-like member 11 is covered with an insulating film.

  The columnar member 2 is a rectangular parallelepiped member as shown in FIG. Since the columnar member 2 becomes a stator tooth in which the magnetic flux density will concentrate in the future, the columnar member 2 is formed of a material having a high saturation magnetic flux density (for example, a CoFe system). The columnar member 2 is set so that the dimension of each side of the cross-sectional shape matches the dimension of the through hole 11a so that the columnar member 2 can be inserted into the through hole 11a of the plate-like member 11. The height hn of the columnar member 2 is set to a height of at least several times the height hb, where hb is the height of the plate-like member 11. The height hn is the height of the stator 1.

  FIG. 4 is a view showing the structure of the stator body 10. 4A shows a state in which the plate-like members 11 are laid out in the Y-axis direction. A plurality of plate-like members 11 are arranged in a line with the long side of each plate-like member 11 parallel to the Y axis. Adjacent lines are shifted in position by 1/2 of the long side of the plate-like member 11. The interval between the through holes 11a is a constant pitch P.

  On the other hand, FIG. 4B shows a state in which the plate-like members 11 are laid out in the X-axis direction. A plurality of plate-like members 11 are arranged in a line with the long side of each plate-like member 11 parallel to the X axis. Adjacent lines are shifted in position by 1/2 of the long side of the plate-like member 11. The interval between the through holes 11a is a constant pitch P.

The stator body 10 is manufactured as follows.
First, the plate-like members 11 are laid out in the Y-axis direction (first layer) as shown in FIG. 3A to such an extent that a necessary area is secured for the stator body 10. On top of that, the plate-like members 11 are laid out in the X-axis direction as shown in FIG. 3B (second layer). At this time, the center position of each through hole 11a in the first layer is made to coincide with the center position of each through hole 11a in the second layer. Further, the plate-like members 11 are laid in the Y-axis direction on the second layer (third layer). As in the case of stacking the second layer, the center position of each through hole 11a in the second layer is made to coincide with the center position of each through hole 11a in the third layer.
In this manner, the plate-like members 11 are alternately laid out in the X-axis direction and the Y-axis direction while matching the center positions of the respective through holes 11a, and the height of the plate-like member 11 is set to the height hn of the columnar member 2. Laminate as many layers as possible. When viewed from above, the plate-like members 11 are arranged in a staggered manner in the X-axis direction and the Y-axis direction. The plate-like members 11 are fastened to each other with an adhesive.

  On the side surface of the stator body 10 immediately after lamination, there is a portion where the plate-like member 11 protrudes by 1/2 in the longitudinal direction. Therefore, the protruding portion of the plate-like member 11 is cut after lamination, and the side surface is smoothed.

  The stator body 10 manufactured in this way has through holes penetrating from the upper surface to the lower surface at a pitch P. The columnar member 2 is inserted into the through hole. The columnar member 2 is inserted so as to protrude vertically from the plate surface on the upper surface side of the stator body 10. The columnar member 2 is projected to the facing surface S. That is, the end surface of the tip of the columnar member 2 protruding from the stator main body 10 becomes the facing surface S.

A portion protruding from the stator body 10 of the columnar member 2 becomes a stator tooth 12. The columnar member 2 is fastened to the surrounding plate-like member 11 with an adhesive. A groove (tooth groove) formed between the columnar members 2 is filled up to the opposing surface S with a nonmagnetic material 3 such as resin. Finally, a finishing process for smoothing the upper and lower surfaces of the stator body 10 is performed.
The facing surface S facing the mover 500 is a smooth surface that passes through the end surface of the tip of the columnar member 2 and the surface of the nonmagnetic material 3.

FIG. 5 is an explanatory diagram showing eddy currents generated in the stator body 10. 5A is a plan view of the stator 1, FIGS. 5B and 5E are cross-sectional views of the stator 1, and FIGS. 5C and 5D are stators 1. FIG. It is sectional drawing of the Y-axis direction.
500X is a mover for the X-axis direction, 500Y is a mover for the Y-axis direction, Φx is a magnetic flux generated by the excitation coil of the mover 500X, Φy is a magnetic flux generated by the excitation coil of the mover 500Y, and Iex is a magnetic flux Φx. Is an eddy current generated by the magnetic flux Φy.

  The magnetic flux Φx passes through the stator 1 in the X-axis direction, and a loop of eddy current Iex is generated in the ZY plane. The ZY plane of the stator 1 is a stack of plate-like members 11 and columnar members 2. Since the plate-like member 11 is insulated, there is no conduction between the plate-like members 11. Further, there is no conduction between each plate member 11 and the columnar member 2. Therefore, the loop of the eddy current Iex is finely divided into small loops that circulate inside the individual plate-like member 11 and the columnar member 2, and as a result, eddy current loss is suppressed.

  Similarly, the magnetic flux Φy passes through the stator 1 in the Y-axis direction, and a loop of eddy current Iey is generated in the XZ plane. The XZ plane of the stator 1 is a stack of plate-like members 11 and a columnar member 2. Since the plate-like member 11 is insulated, there is no conduction between the plate-like members 11. Further, there is no conduction between each plate member 11 and the columnar member 2. Therefore, the loop of the eddy current Iey is finely divided to form a small loop that circulates inside the individual plate member 11 and the columnar member 2, and as a result, eddy current loss is suppressed.

  In this way, the present embodiment is configured as described above, and the plate-like members 11 are alternately laid in parallel in the X-axis direction and the Y-axis direction in parallel to the facing surface S, and laminated to a predetermined thickness toward the facing surface S. Thus, the stator main body 10 is formed, and the columnar member 2 is inserted into the stator main body 10 to constitute the stator 1, whereby the effect of suppressing eddy current loss is improved in both the X-axis direction and the Y-axis direction. Obtainable. Thereby, an eddy current loss can be suppressed regardless of the moving direction of the mover 500, and a motor stator and motor that can improve the power efficiency of the motor can be realized.

  Further, in this embodiment, when the stator 1 is manufactured, the laminated structure of the stator teeth 12 and the stator body 10 is divided into two, and the plate member 11 is not grooved. For this reason, the magnetic thin plate forming the plate-like member 11 does not require highly accurate plate thickness management as in the conventional example. For this reason, the cost of the stator for the motor and thus the entire motor can be kept low.

  Further, in this embodiment, since the stator 1 is formed of different members such as the plate-like member 11 and the columnar member 2, the materials can be properly used according to the necessity of the saturation magnetic flux density of each part. In the present embodiment, only the columnar member 2 on which the magnetic flux concentrates as the stator teeth 12 is manufactured from a material having a high magnetic flux saturation density. The portion where the magnetic flux density is not concentrated as much as the stator teeth 12 and does not require a high magnetic flux saturation density is made of a plate-like member 11 made of a normal electromagnetic soft iron material. Thereby, the manufacturing cost of the stator 1 can be reduced. As a result, the cost of the entire motor is also reduced.

  Further, in this embodiment, the columnar member 2 is protruded from the plate-like member 11 to form the stator teeth 12, so that the groove processing as in the conventional example becomes unnecessary. For this reason, there is no deterioration of the magnetic characteristics due to the groove processing of the stator, and the power efficiency of the motor can be maintained.

  Further, since the columnar member 2 is inserted and held in the through hole of the stator main body 10, it acts like a nail for fixing the plate-shaped members 11 on which the columnar members 2 are laminated. Increases the strength of the laminate.

  Further, the through holes 1a are formed in advance in each plate-like member 11, and each plate-like member 11 is laminated while maintaining the positional relationship of the through-holes, so that no through-hole is formed in the plate-like member 11 after lamination. It's okay.

  Further, in the present embodiment, the opposing surface S is a flat surface, the stator body 10 is formed in a flat plate shape, and the columnar member 2 protrudes perpendicularly from the plate surface of the stator main body 10. It is a motor stator suitable for motors.

  Further, in this embodiment, the space between the columnar members 2 protruding from the stator main body 10 is filled with the nonmagnetic material 3 up to the surface S facing the mover 500. Therefore, insulation between the columnar members 2 is ensured, and the facing surface S facing the mover 500 becomes a smooth surface.

  In the present embodiment, eight through holes 1a are formed in the plate-like member 11, but the number of through holes is not limited to eight. In the present embodiment, the cross-sectional shape of the columnar member 2 and the shape of the through hole of the plate-like member are square, but the shape is not limited to this, and may be other shapes such as a rectangle, a circle, and an ellipse.

  In this embodiment, the stator body 10 is formed by using the plate-like member 11 in which the through-hole 1a is formed in advance. However, a plate-like member in which the through-hole is not formed is laminated, and this laminated body after lamination. Alternatively, a through hole for the columnar member 2 may be formed to form the stator body.

  In the first embodiment, the stator 1 is formed in a planar shape, but the stator can also be formed in a curved surface shape. FIG. 6 shows an example in which the stator is formed in a cylindrical shape as the second embodiment. FIG. 6A is a perspective view of the stator of this embodiment, and FIG. 6B is a cross-sectional view of the stator of this embodiment.

The plate-like members 11 ′ are arranged so as to form the hollow portion 40 on the inner side and are laminated in the radial direction to form the stator body 10 ′. The columnar members 2 are inserted radially into the through holes 11a ′ of the plate-shaped member 11 ′. The columnar member 2 is protruded in the outer peripheral direction of the plate-like member 11 ′ to constitute a stator tooth 12 ′. The tooth gap of the columnar member 2 is filled with the non-magnetic material 3 and the surface is smoothly finished.
With this configuration, the surface facing the mover (not shown) is a cylindrical surface, and the stator body 10 'is formed in a cylindrical shape.

  The external dimensions of the plate-like member 11 ′ and the positions of the through holes 11 a ′ are set according to the number of layers to be stacked. The plate-like member 11 ′ has a shape bent with a curvature corresponding to the distance from the center of the cylinder. The columnar member 2 is arranged so that the protruding end surface has a constant pitch in the two-dimensional direction on the plane where the surface facing the mover is developed.

  The mover has a cylindrical shape whose inner diameter is larger than the outer peripheral diameter of the stator 1 ′, and is arranged concentrically with the stator. Mover teeth are formed on the inner surface of the mover cylinder.

According to the present embodiment, it is possible to configure a surface motor capable of two-dimensional movement by fixing the stator 1 ′ and rotating or moving the mover around the stator 1 ′.
Further, if the mover 1 ′ and the stator are fixed / non-fixed, a surface motor capable of rotating or translating the inner cylinder can be configured.

  In this embodiment, the hollow portion 40 is formed inside the stator main body 10 '. However, the hollow portion 40 may be filled with a nonmagnetic material. Moreover, the center of the hollow part 40 may be provided with a shaft of a magnetic substance such as iron via a non-magnetic material having an appropriate thickness.

  In this embodiment, the surface facing the mover is cylindrical, but if the facing surface is spherical and the stator body is spherical, a motor stator suitable for a spherical surface motor is realized. be able to. In this case, the facing surface of the mover is arranged concentrically with the stator and becomes at least a part of a spherical surface having a diameter larger than that of the stator.

Next, Example 3 will be described. In this embodiment, a stepped columnar member 20 is used instead of the columnar member 2 with respect to the previous embodiment 1.
As shown in FIG. 7A, the columnar member 20 has a stepped portion 21 at the center, and the columnar member 20 is divided into an upper side and a lower side with the stepped portion 21 as a boundary. The step portion 21 is formed such that the upper side is thinner than the lower side. The cross section on the upper side is a square with one side dn, and the cross section on the lower side is a square with one side dm (dn <dm). The height of the entire columnar member 20 is hn, and the height of the lower part than the stepped portion 21 is h1. The height h1 is an integer multiple of the height hb of the plate member.

  The plate-like member has a plate-like member 11A in which a through hole 11Aa having a side dn as shown in FIG. 7B is formed, and a side length as shown in FIG. Two types of plate-like members 11B having dm through holes 11Ba are prepared. Until the height of the laminated plate-like members becomes h1, the plate-like members 11B are used for lamination. From the next layer, the plate-like member 11A is used, and the whole plate-like member is laminated so that the height does not exceed the height hn of the columnar member 20. When the plate-like members 11A and 11B are stacked, the center positions of the through holes 11Aa and 11Ba are made to coincide.

The columnar member 20 is inserted from the plate-like member 11B side of the stator body. The columnar member 20 is inserted into the plate-like member 11B from the upper end surface. The upper end surface of the columnar member 20 protrudes vertically from the stator body.
A groove formed between the columnar members 20 is filled with a non-magnetic material 3 such as resin, and finishing is performed. Other configurations are the same as those of the first embodiment.

  According to this embodiment, even if a magnetic attractive force in the direction of the mover acts on the columnar member 20, the columnar member 20 is supported by the plate-shaped member at the stepped portion 21 because of the stepped structure. Thereby, the columnar member 20 is held on the plate-like member more firmly than when the columnar member 20 is fastened to the plate-like member only with the adhesive. By tightening the fastening of the columnar member 20 and the plate-like member, it is possible to realize a high-thrust motor having a stronger magnetic attractive force.

In addition, although the present Example demonstrated as what applied the columnar member 20 to Example 1, the columnar member 20 is applicable to Example 2 similarly.
The cross-sectional shape of the columnar member is square on both the upper side and the lower side. However, the shape is not limited to this. For example, the upper side of the columnar member is circular and the lower side is square. It is good also as a different shape.
Furthermore, although the number of steps provided in the columnar member 20 is one, it may be a plurality of steps.

FIG. 1 is a diagram showing an embodiment of a motor stator and a motor showing the configuration of Embodiment 1 according to the present invention. FIG. 2 is a diagram showing a part of the stator for motor and the motor shown in FIG. FIG. 3 is a view showing the shapes of the plate-like member 11 and the columnar member 2. FIG. 4 is a view showing the structure of the stator body 10. FIG. 5 is an explanatory diagram showing eddy currents generated in the stator body 10. FIG. 6 is a diagram illustrating an example in which the stator of Example 2 is formed in a cylindrical shape. FIG. 7 is a view showing an example in which the columnar member of Example 3 is formed into a stepped shape. FIG. 8 is a diagram showing a conventional planar motor. FIG. 9 is a view showing the structure of a conventional stator 100. FIG. 10 is an explanatory diagram showing eddy current generated in the stator 100 of the conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 10 Stator main body 11 Plate-shaped member 11a Through-hole 12 Stator tooth 2 Columnar member 3 Nonmagnetic material 11 'Plate-shaped member 11a' Through-hole 12 'Columnar member 40 Hollow part 11A, 11B Plate-shaped member 11Aa, 11Ba Through hole 20 Columnar member 21 Step part 200 Surface plate 500 Movable element

Claims (9)

A stator for a motor for disposing it facing the mover,
A plurality of plate-like members made of a magnetic material are arranged in parallel to the surface facing the mover, and the stator body is laminated to a predetermined thickness toward the facing surface;
A columnar member having a saturation magnetic flux density higher than that of the plate-like member, and being held by the stator body and protruding to the facing surface;
The columnar members are arranged so as to have a constant pitch in a two-dimensional direction.   The motor stator according to claim 1, wherein the columnar member is inserted and held in a through hole of the stator body.   The stator for a motor according to claim 2, wherein the through holes are formed in advance in individual plate members, and the plate members are stacked while maintaining the positional relationship of the through holes.   The surface facing said movable element is a plane, the said stator main body is formed in flat form, and the said columnar member protrudes perpendicularly | vertically from the plate | board surface of a stator main body. A stator for a motor according to any one of the above.   The surface facing said movable element is a cylindrical surface, said stator main body is formed in a cylindrical shape, and said columnar member protrudes in the radial direction of the stator main body. The stator for motors according to any one of the above.   4. The method according to claim 1, wherein a surface facing the mover is a spherical surface, the stator body is formed in a spherical shape, and the columnar member protrudes in a radial direction of the stator body. The stator for motors according to the above.   7. The motor fixing according to claim 5, wherein the columnar members are arranged such that protruding end surfaces thereof have a constant pitch in the two-dimensional direction on a plane in which the opposing surface is developed. Child.   The motor stator according to any one of claims 1 to 7, wherein a space between the columnar members protruding from the stator main body is filled with a nonmagnetic material up to a surface facing the mover.   A motor comprising: the motor stator according to claim 1; and a mover opposed to the motor stator.