JP4828344B2 - MANUFACTURING METHOD FOR LINEAR MOTOR AND MAGNET INSERTION DEVICE USED IN THE METHOD, LINEAR MOTOR STATOR MANUFACTURING DEVICE - Google Patents

Description

  The present invention relates to a method for manufacturing a linear motor, a magnet insertion tool used in the method, a linear motor stator manufacturing apparatus, and a linear motor.

  Since linear motors do not have wearable members, the initial positioning accuracy and running accuracy can be maintained over a long period of time, and it is easy to improve responsiveness and speed stability. Besides being used as a power source, it is also used as a drive source for a feed mechanism that requires high positioning accuracy, such as a spindle of a machine tool, a feed mechanism of a table, or a feed mechanism of a precision stage, and its application tends to expand. It is in.

  For example, when a linear motor is used as a drive source for a feed mechanism that requires high positioning accuracy, a coreless linear motor that can easily suppress speed ripple is generally used as the linear motor. In a coreless linear motor, the strength of the magnetic field that can be generated in the armature is weaker than that of a cored linear motor. Therefore, when trying to obtain a coreless linear motor with a large thrust, normally, a plurality of permanent magnets are arranged in even rows. The stator is formed by arranging the permanent magnets constituting one row across the yoke so as to face the permanent magnets constituting the other row.

  At this time, in each row (hereinafter referred to as “permanent magnet row”), a predetermined number of permanent magnets are arranged so that the polarities of adjacent permanent magnets are opposite to each other. In addition, the permanent magnets of a certain permanent magnet array and the permanent magnets of the other permanent magnet array facing the permanent magnet are arranged with their opposite magnetic poles facing each other so that the directions of the magnetic fields are the same. The Not only the coreless linear motor but also the cored linear motor, the stator can be configured by arranging a plurality of permanent magnets on the yoke over even rows as described above.

  In both the coreless linear motor and the cored linear motor, in order to reduce the speed ripple and stabilize the thrust, the permanent magnet arrangement pitch in each permanent magnet row in the stator is made constant and small. However, if permanent magnets having opposite polarities are arranged close to each other, an attractive force acts between them, making it difficult to arrange them at a constant pitch. In particular, when two permanent magnet arrays facing each other are formed simultaneously, an attractive force acts between adjacent permanent magnets in each permanent magnet array, and between the permanent magnets facing each other between the permanent magnet arrays facing each other. Since the attractive force works, it becomes more difficult to arrange the permanent magnets at a constant pitch.

  For example, if the yoke is constituted by a plurality of members (side yoke and center yoke) as in the linear motor described in Patent Document 1 and each permanent magnet row is formed separately, each permanent magnet row It is relatively easy to make the permanent magnet pitch constant and small, but still, a permanent magnet with a high magnetic flux density like a rare earth magnet has a strong attractive force between adjacent ones. Therefore, it is difficult to make the arrangement pitch constant and small. For this reason, for example, in the motor magnet device of the invention described in Patent Document 2, a predetermined number of permanent magnets are fixed to the yoke under a constant interval using a comb-shaped positioning die.

Japanese Patent No. 3214075 JP 2002-272085 A

  However, when the yoke is constituted by a plurality of members (side yoke and center yoke) as in the linear motor described in Patent Document 1, the number of parts and man-hours increase, resulting in an increase in manufacturing cost. Similarly, when the positioning die is used like the motor magnet device described in Patent Document 2, the manufacturing cost increases.

  For example, in the case of an unmagnetized permanent magnet, it is relatively easy to arrange in a row with a constant and small arrangement pitch. Although it is relatively easy to form two permanent magnet rows facing each other, after the permanent magnet rows are formed in this way, the permanent magnets in each row are uniformly magnetized under a predetermined polarity. It is difficult. The variation in the magnetic force between the permanent magnets may cause the speed ripple of the linear motor to increase, or may cause the thrust to vary.

  The present invention has been made in view of the above, and a method of manufacturing a linear motor that can easily obtain a linear motor with small speed ripple and stable thrust at low cost, and a magnet insertion tool used in this method Another object of the present invention is to provide a linear motor stator manufacturing apparatus and a linear motor in which a speed ripple is small and a thrust is stable.

  A method of manufacturing a linear motor of the present invention that achieves the above object includes a stator and a movable element that moves away from the stator, and the stator has a groove shape having two inner planes facing each other. And a permanent magnet array formed on each of the two inner planes, and an even number of magnet holders formed of a non-magnetic material and detachably holding the permanent magnets Are divided into two groups and arranged back-to-back with an even number of permanent magnets in a state where an adhesive is applied to one principal surface of each of the even number of permanent magnets, and the one principal surface A magnet holding step for holding the magnet insertion tool in an orientation that faces the outside, and a main surface of each of the even number of permanent magnets held by the even number of magnet holding portions facing the inner plane of the yoke. Of the two And a magnet sticking step of releasing the holding of the permanent magnets by the magnet holding portion and causing each of the even number of permanent magnets to be attracted to the inner plane of the yoke by the magnetic force of the permanent magnets after being inserted between the planes. It is what.

  In the method of manufacturing a linear motor according to the present invention, two permanent magnet rows are formed in the yoke by repeating the above-described magnet holding step and magnet sticking step in this order. If such a yoke is used, the number of parts and man-hours can be reduced. Further, since the pasting process can be performed by holding a magnetized permanent magnet whose quality is controlled in advance on the above-described magnet insertion tool, a permanent magnet row is formed only by a permanent magnet having a magnetic force within a predetermined range. Is easy. Furthermore, since the position of the permanent magnets affixed to the yoke can be regulated by the position of the magnet insertion tool, it is easy to form a permanent magnet row by making the arrangement pitch of the permanent magnets constant and small. . Therefore, according to the method for manufacturing a linear motor of the present invention, it becomes easy to obtain a linear motor having a small speed ripple and a stable thrust at a low cost.

  Embodiments of a linear motor manufacturing method, a linear motor stator manufacturing apparatus, and a linear motor according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

Embodiment 1 FIG.
The method for manufacturing a linear motor according to the present invention includes the magnet holding step and the magnet attaching step as described above, and these steps are repeated to simultaneously form two permanent magnet rows in the yoke. Hereinafter, it explains in full detail for every process.

(Magnet holding process)
In the magnet holding step, the even number of permanent magnets are separated into the even number of permanent magnets by the magnet insertion tool in which the even number of magnet holding parts for holding the permanent magnets detachably is divided into two groups and arranged back to back. It is held in a state in which an adhesive is applied to one main surface, and the one main surface is directed outward.

  FIG. 1 is a perspective view schematically showing an example of a magnet insertion tool used in a magnet holding step. A magnet insertion tool 20 shown in the figure is included in the magnet insertion tool of the present invention, and includes two magnet holding portions 10 and 10 and a head portion 13 connected to the magnet holding portions 10 and 10. have. Each magnet holding part 10 and 10 is located under the head part 13, and these magnet holding parts 10 and 10 are the direction in which the one main surface 25a becomes the outer side of the permanent magnet 25 shape | molded in flat form. And hold it in a vertically long state. In FIG. 1, a part of the outline of the permanent magnet 25 is represented by a two-dot chain line.

  Each magnet holding part 10 is formed of a non-magnetic material, and these magnet holding parts 10 and 10 are the back part with which the stage part 1 which mounts the permanent magnet 25, and the other main surface in the permanent magnet 25 contact | abut. The plate portion 3 includes an upper claw portion 5 that presses the upper end portion of the permanent magnet 25 from the outside of the permanent magnet 25, and a lower claw portion 7 that presses the lower end portion of the permanent magnet 25 from the outside of the permanent magnet 25. Yes. One back plate portion 3 is shared by each magnet holding portion 10.

  Each magnet holding part 10 is configured such that each of the upper claw part 5 and the lower claw part 7 moves up and down by manually rotating the handle 15 provided on the head part 13 forward or reverse. For example, when the handle 15 is reversed, the upper claw portion 5 slides upward while the lower claw portion 7 slides downward, so that the permanent magnet 25 can be disposed on each stage 1, and the handle 15 is When it is turned, the upper claw part 5 slides downward, while the lower claw part 7 slides upward, and the permanent magnets 25 arranged on each stage 1 are fixed by the upper claw part 5 and the lower claw part 7. . A power conversion mechanism (not shown) that converts the rotational movement of the handle 15 into the vertical movement of the upper claw part 5 and the lower claw part 7 is incorporated in the head part 13 and the back plate part 3.

  In addition, on both sides of each upper claw portion 5 in the width direction (left and right direction in FIG. 1), when the magnet insertion tool 20 is inserted into the groove-shaped yoke, the insertion depth that controls the insertion depth is in contact with the upper surface of the yoke. A restriction portion 17 is provided. Each insertion depth restricting portion 17 protrudes in the thickness direction of the permanent magnet 25 when the permanent magnet 25 is held by the magnet holding portion 10.

  The permanent magnets 25 are held by the respective magnet holding units 10 so that the permanent magnets 25 held by one magnet holding unit 10 and the permanent magnets 25 held by the other magnet holding unit 10 have opposite magnetic poles. This is done so that it faces the 3rd side. As each permanent magnet 25, it is preferable to use a magnetized permanent magnet whose quality has been controlled in advance, that is, a magnetized permanent magnet that has been selected only with a magnetic force within a predetermined range.

  The adhesive is applied to the outer main surface 25 a of the permanent magnet 25 held by the magnet holding unit 10. The application of the adhesive can be performed before the permanent magnet 25 is held by the magnet insertion tool 20, or can be performed after the permanent magnet 25 is held by the magnet insertion tool 20. As the adhesive, it is preferable to use an adhesive having a short curing time, for example, a cationic polymerization type.

(Magnet sticking process)
In the magnet sticking step, a magnet insertion tool is inserted into a groove-shaped yoke having two inner planes facing each other, and a permanent magnet is stuck to each of the two inner planes. Specifically, after inserting the magnet insertion tool between the two inner planes of the yoke so that the one main surface of each permanent magnet held by each magnet holding portion faces the inner plane of the yoke, the magnet The holding of the permanent magnet by the holding portion is released, and each permanent magnet is attracted to the inner plane of the yoke by the magnetic force of the permanent magnet.

  In order to make the arrangement pitch of the permanent magnets in the permanent magnet row formed in the yoke a desired value, the arrangement direction of the permanent magnets in the permanent magnet row and the plan view between the two inner planes in the yoke It is preferable to insert the guide plate so as to be orthogonal to each other and to regulate the attracting position of the permanent magnet to the yoke by the guide plate. At this time, if each of the permanent magnets is attracted by a magnetic force through the guide plate in the above arrangement direction, the attracting position of the permanent magnet on the yoke can be easily regulated.

  Since the magnet holding part of the magnet insertion tool is made of a nonmagnetic material, the attractive force acting between the two permanent magnets held by the magnet insertion tool is small. For this reason, when the holding of the permanent magnet by the magnet holding portion is released, the permanent magnet is attracted to the yoke by the attractive force acting between the yoke magnetized by the permanent magnet and the permanent magnet. Since the adhesive is applied to the permanent magnet in the magnet holding step, the permanent magnet is fixed to the yoke when the adhesive is cured. When the above-described guide plate is used in combination with this magnet sticking step, it is preferable that the guide plate is arranged in advance on the yoke.

  FIG. 2 is a perspective view schematically showing an example of a yoke and guide plates arranged on the yoke. The yoke 30 shown in the figure has a groove shape made of an integrally molded product of a ferromagnetic material such as iron, and the vertical cross section thereof is connected by one rectangle extending in the horizontal direction at the lower end of each of two rectangles extending in the vertical direction. It exhibits a U-shape or a saddle shape corresponding to the contour shape of the time. The yoke 30 has two inner planes 30a and 30b facing each other.

  A desired number of guide plates are arranged so that the space between the inner flat surfaces 30 a and 30 b in the yoke 30 is partitioned at a constant pitch along the longitudinal direction of the yoke 30. In FIG. 2, one guide plate 33a disposed at one end in the longitudinal direction of the yoke 30 is indicated by a solid line, and the other guide plates 33b to 33h are indicated by phantom lines (two-dot chain lines). Yes. Each of the guide plates 33a to 33h is made of a nonmagnetic material, and each of the illustrated guide plates 33a to 33h has a T shape.

  As shown in FIG. 2, the magnet insertion tool 20 holding the two permanent magnets 25 is inserted between the two inner flat surfaces 30 a and 30 b of the yoke 30 from above the yoke 30. In FIG. 2, the insertion direction of the magnet insertion tool 20 is indicated by an arrow A. Of the guide plates 33a to 33h disposed on the yoke 30, the guide plate 33a is disposed prior to attaching the first permanent magnet 25 to the yoke 30 using the magnet insertion tool 20, and the other guide plates 33b to 33h. Can be arranged prior to the first permanent magnet 25 being affixed to the yoke 30, or can be arranged one by one after each magnet affixing process.

  A rectangular bar-shaped guide plate holder 35 is inserted into the bottom of the yoke 30 between the inner flat surfaces 30a and 30b so that the guide plates 33a to 33h can be easily arranged on the yoke 30 at a constant pitch. Has been. The guide plate holder 35 is formed with slit-like openings (not shown in FIG. 2) at the same pitch as the above pitch, and the lower ends of the guide plates are inserted into the openings. Is done. A suction plate 37 is fixedly disposed on the outer side of the guide plate 33a (the outer side along the longitudinal direction of the yoke 30). The suction plate 37 is made of, for example, a ferromagnetic material or a magnet, and attracts the permanent magnet 25 in a direction parallel to the arrangement direction of the permanent magnets in the permanent magnet array to be formed on the yoke 30. In FIG. 2, illustration of the adhesive applied to each permanent magnet 25 is omitted. This also applies to FIGS. 3 and 4 described later.

  FIG. 3 is a sectional view schematically showing a state where the magnet insertion tool inserted into the yoke is desired in the longitudinal direction of the yoke. As shown in the figure, the magnet insertion tool 20 is inserted into the yoke 30 until the lower surface of each insertion depth regulating portion 17 hits the upper surface of the yoke 30. At this time, the main surface 25 a of one permanent magnet 25 faces one inner plane 30 a of the yoke 30, and the main surface 25 a of the other permanent magnet 25 faces the other inner plane 30 b of the yoke 30. The main surface 25a of each permanent magnet 25 and the inner flat surfaces 30a and 30b facing the main surface 25a are separated from each other. In FIG. 3, the guide plate is not shown.

  FIG. 4 is a cross-sectional view schematically showing a state immediately before the first permanent magnet 25 is attached to the yoke 30 using the magnet insertion tool 20. As shown in the figure, since the guide plate 33a is disposed between the magnet insertion tool 20 and the suction plate 37, each permanent magnet 25 (only one permanent magnet 25 in FIG. 4 appears). ) And the suction plate 37 disposed at one end of the yoke 30 magnetically attract each other, but the movement of each permanent magnet 25 toward the suction plate 37 is restricted by the guide plate 33a.

  When the handle 15 of the magnet insertion tool 20 is rotated in a predetermined direction in this state and the holding of the permanent magnet 25 by the magnet holding part 10 is released, that is, when the permanent magnet 25 is unfixed by the upper claw part 5 and the lower claw part 7. Since the magnet holding part 10 is made of a nonmagnetic material, the permanent magnet 25 is attracted to the yoke by the attractive force acting between the yoke 30 magnetized by the permanent magnet 25 and the permanent magnet 25, and as a result A magnet 25 is attached to the yoke 30.

  At this time, the distance between the permanent magnet 25 held by the magnet insertion tool 20 and the inner plane 30a or the inner plane 30b of the yoke 30 facing the permanent magnet 25 is set within a predetermined range according to the magnetic force of the permanent magnet 25. The permanent magnet 25 flies almost horizontally to the inner flat surface 30a side or the inner flat surface 30b side facing the permanent magnet 25, and is attached to the inner flat surface 30a or the inner flat surface 30b with one side surface in contact with the guide plate 33a. Is done. When the adhesive (not shown) applied to the permanent magnet 25 is cured, the permanent magnet 25 is fixed to the yoke 30. In FIG. 4, three guide plates 33a to 33c are drawn with solid lines. These guide plates 33a to 33c are arranged below a certain pitch P.

  Thereafter, the magnet holding step described above and the magnet attaching step described above are repeated in this order to form two permanent magnet rows in the yoke 30, thereby obtaining a stator of the linear motor. The permanent magnets 25 are attached to the inner flat surfaces 30a and 30b of the yoke 30 in order from the end of the permanent magnet row to be formed. In the second and subsequent magnet attaching steps, the permanent magnet 25 attached or fixed to the yoke 30 in the previous magnet attaching step plays the same role as the above-described suction plate 37, so that the arrangement of the suction plate 37 becomes unnecessary. It is preferable that the guide plate is recovered after the adhesive applied to the corresponding permanent magnet 25 (attached to the yoke 30) is cured.

  FIG. 5 is a flowchart showing an example of work contents until a linear motor stator is obtained. In obtaining the stator by the example shown in the figure, first, the step S1 of holding the two permanent magnets by the magnet insertion tool and the outer main surface of each of the two permanent magnets held by the magnet insertion tool are bonded. Step S2 for applying the agent; Step S3 for arranging a predetermined number of guide plates on the yoke; Step S4 for inserting a magnet insertion tool holding two permanent magnets between the two inner planes of the yoke; Step S5 of releasing the holding of the permanent magnet by the tool is performed in this order, and the process proceeds to step S6 where the permanent magnet is attached to the inner wall of the yoke.

  Thereafter, step S7 for collecting the magnet insertion tool and step S8 for determining whether or not a predetermined number of permanent magnets are attached to the yoke are performed in this order, and a predetermined number of permanent magnets are attached to the yoke in step S8. If it is determined that it is not, the process returns to step S1 and the process up to step S8 is performed again. On the other hand, when it is determined in step S8 that a predetermined number of permanent magnets have been attached to the yoke, the process proceeds to step S9 to recover the guide plate. By performing the process up to step S9, a linear motor stator is obtained.

  Of steps S1 to S9 described above, steps S1 and S2 are performed in the magnet holding process described above, and steps S4 to S6 are performed in the magnet attaching process described above. Step S3 can be included in the magnet attaching step or can be regarded as an independent step. Similarly, step S7 can be included in the magnet holding process or the magnet attaching process, or can be regarded as an independent process.

  FIG. 6 is a perspective view schematically showing an example of the stator obtained as described above. In the stator 50 shown in the figure, one permanent magnet row 40a is arranged on one inner plane 30a in the yoke 30 (see, for example, FIG. 2), and one other permanent plane is arranged on the other inner plane 30b in the yoke 30. A magnet row 40b is arranged, and each permanent magnet row 40a, 40b extends in the longitudinal direction of the yoke.

  Each permanent magnet row 40a, 40b is composed of a plurality of permanent magnets 25. The two permanent magnets 25, 25 adjacent to each other in each permanent magnet row 40a, 40b have opposite polarities. Further, each permanent magnet 25 constituting one permanent magnet row 40a is opposed to a predetermined permanent magnet 25 constituting the other permanent magnet row 40b, and the two opposing permanent magnets 25, 25 are opposite to each other. The magnetic poles are confronted.

  As already described with reference to FIGS. 2 to 5, when inserting the magnet insert 20 holding the two magnetized permanent magnets 25 between the two inner planes of the yoke 30, the magnet insert The insertion depth 20 is regulated by each insertion depth regulating unit 17. Further, the positions of the permanent magnets 25 in the direction parallel to the arrangement direction of the permanent magnets 25 in the permanent magnet rows 40a and 40b to be formed are regulated by the guide plates 33a to 33h (see FIG. 2). As a result, in each permanent magnet row 40a, 40b obtained by repeating the magnet holding step and the magnet pasting step described above, the height positions of the individual permanent magnets 25 are aligned, and the individual permanent magnet row 40a. , 40b, it is easy to align the arrangement pitch of the permanent magnets 25, 25 adjacent to each other.

  The target linear motor is obtained by preparing a mover separately from the stator 50 described above and combining them. The mover is manufactured, for example, by fixing a winding portion with a core to an attachment portion having a desired shape, or by fixing a coreless winding portion to an attachment portion having a desired shape. The winding part is connected to a predetermined drive circuit.

  FIG. 7 is a perspective view schematically showing an example of the linear motor of the present invention. A linear motor 70 shown in the figure is obtained by the above-described method for manufacturing a linear motor according to the present invention, and is a linear motor including a stator 50 and a mover 60. The yoke 30 in the stator 50 is an integrally molded product made of a ferromagnetic material, and the other configuration of the stator 50 has already been described with reference to FIG. The mover 60 is obtained by fixing the coreless winding portion 53 to the lower surface of the attachment portion 55, and the attachment portion 55 has a flat plate shape having a rectangular planar shape. The winding portion 53 is located between the two permanent magnet rows 40 a and 40 b in the stator 50, and the attachment portion 55 is located on the yoke 30.

  When the illustrated winding portion 53 is connected to a predetermined drive circuit, a predetermined magnetic field is formed around the winding portion 53, and this magnetic field and the magnetic field formed in the stator 50 by each permanent magnet 25 are repelled. The mover 60 is separated (separated) from the stator 50. By appropriately controlling the phase of the current supplied to the winding portion 53, the mover 60 can be moved along the permanent magnet arrays 40a and 40b, and the moved one can be stopped.

  In such a linear motor 70, as already described, the height position of each permanent magnet 25 in each permanent magnet row 40a, 40b in the stator 50 (the height position based on the upper surface of the yoke 30). In addition, the arrangement pitch can be easily aligned. Further, since an integrally molded product of a ferromagnetic material is used as the yoke 30, it is easy to reduce the number of parts and the number of steps. Furthermore, if a permanent magnet whose quality is controlled in advance is used as the permanent magnet 25 and the permanent magnet 25 is fixed to the yoke 30 to form the permanent magnet rows 40a and 40b, the magnetic force is within a predetermined range. Permanent magnet arrays 40a and 40b can be formed only by a certain magnetized permanent magnet 25. As a result, the linear motor 70 can easily reduce the speed ripple and stabilize the thrust, and can be easily manufactured at a low cost.

  In particular, for small linear motors, it is difficult to fix a magnetized permanent magnet in a narrow gap in an integrally molded yoke, or after fixing an unmagnetized permanent magnet. Since a strong magnetizing jig that can be inserted into a narrow gap is difficult to manufacture even when magnetized using a magnetic jig, it is also difficult to magnetize uniformly. Is valid. Here, the “small linear motor” means a linear motor having a rated thrust of about 1 kN or less.

Embodiment 2. FIG.
The apparatus for manufacturing a stator for a linear motor according to the present invention is an apparatus that can be used when manufacturing a linear motor according to the manufacturing method of the present invention described above, and includes a yoke fixing part, a magnet insertion tool, an insertion tool holding part, a horizontal Direction moving means and vertical direction moving means are provided. When the guide plate described in the first embodiment is used together, a guide plate holder is also used.

  The yoke fixing portion is a member to which a groove-shaped yoke having two inner flat surfaces facing each other is fixed. The overall shape of the yoke fixing portion is, for example, a groove shape similar to that of the yoke or the upper surface is released. It can be a box shape.

  The above magnet insertion tool is a member in which even-numbered magnet holding portions are divided into two groups and are arranged back to back, and each magnet holding portion is formed of a non-magnetic material, and the permanent magnet is replaced with the permanent magnet. Removably hold in a direction in which one main surface is on the outside. As such a magnet insertion tool, for example, the magnet insertion tool 20 (see FIG. 1) described in the first embodiment is used.

  The insertion tool holding part has a specific orientation of the above-described magnet insertion tool, that is, a direction in which the normal line on one main surface of the permanent magnet is horizontal when the magnet holding part of the magnet insertion tool is held. The shape and structure are appropriately selected.

  The horizontal movement means moves the relative position of the insertion tool holding portion with respect to the yoke fixed to the yoke fixing portion in the horizontal direction at the same pitch as the arrangement pitch of the permanent magnets in the permanent magnet row formed on the stator. It is displaced stepwise, and at least one of the yoke fixing part and the insertion tool holding part is moved in the horizontal direction. This horizontal movement means can be configured using, for example, a manual carriage, a self-propelled carriage, or a precision stage.

  The vertical movement means is configured to determine a relative position of the insertion tool holding portion with respect to the yoke fixed to the yoke fixing portion, one main surface of the permanent magnet held by the magnet holding portion of the magnet insertion tool, and the inner plane of the yoke. It is displaced in the vertical direction on the yoke fixing portion while being kept parallel to each other, and at least one of the yoke fixing portion and the insertion tool holding portion is moved in the vertical direction. This vertical movement means is permanent when the magnet insertion tool holding the permanent magnet in the magnet holding part is held by the insertion tool holding part and moved to the relative bottom dead center in the vertical movement means. One main surface of the magnet and the inner plane of the yoke are configured to face each other.

  Such vertical movement means can be configured using, for example, a manual lift or an electric lift (including those using pneumatic pressure or hydraulic pressure). In this specification, “relative bottom dead center in the vertical direction moving means” means that the relative position of the insertion tool holding part holding the magnet insertion tool is on the yoke fixed to the yoke fixing part. It means a portion where the vertical distance between the yoke and the magnet insertion tool becomes the shortest when displaced by the vertical movement means.

  The guide plate holder used in combination as needed is a member that is arranged and used at the bottom between two inner planes of the yoke, and this guide plate holder is a permanent magnet array formed on the stator. The guide plate is held at the same pitch as the permanent magnet arrangement pitch. As such a guide plate holder, for example, the guide plate holder 35 (see FIG. 2) described in the first embodiment is used. As the guide plate, for example, the guide plates 33a to 33h (see FIG. 2) described in the first embodiment are used.

  Hereinafter, the manufacturing apparatus of the stator for linear motors of this invention is concretely demonstrated using FIG. 8 and FIG.

  FIG. 8 is a front view schematically showing an example of the linear motor stator manufacturing apparatus of the present invention, and FIG. 9 is a side view schematically showing the linear motor stator manufacturing apparatus shown in FIG. FIG. The linear motor stator manufacturing apparatus 160 shown in these drawings includes a yoke fixing part 100, a magnet insertion tool 20, an insertion tool holding part 110, a horizontal direction moving means 130, a vertical direction moving means 150, and a guide plate holder 155. It has. Hereinafter, each member will be described. However, since the magnet insertion tool 20 has been described in detail in the first embodiment with reference to FIG. 1 and the like, the description thereof is omitted here.

  Said yoke fixing | fixed part 100 is exhibiting the groove shape similar to the yoke 30 (refer FIG. 9), and the yoke 30 is fixed to the yoke fixing | fixed part 100 upward by the fixing tool which abbreviate | omitted illustration. A pair of guide plate engaging portions 105, 105 are provided on the yoke fixing portion 100, and the yoke fixing portion 100 itself is fixed upward on a horizontal moving means 130 described later. The insertion tool holder 110 holds the magnet insertion tool 20 by sandwiching the head portion 13 (see FIG. 1) of the magnet insertion tool 20, and the insertion tool holder 110 is a magnet insertion tool 20. When the permanent magnet 25 is held by the magnet holding unit 10 in the above, the magnet insertion tool 20 is held in such a direction that the normal line on one main surface of the permanent magnet 25 becomes horizontal. The insertion tool holding part 110 is attached to a vertical movement means 150 described later.

  The horizontal movement means 130 is engaged with two guide portions 113 and 113 provided on the base 111 and moves along the guide portions 113 and 113, and the carriage 120 along the guide portions 113 and 113. A carriage fixing means 125 capable of fixing the position of the carriage 120 at the same pitch as the arrangement pitch (the arrangement pitch of the permanent magnets in the permanent magnet array formed on the stator) when the carriage moves. Contains. The two guide portions 113 and 113 are provided in parallel to each other, and they have a rail shape. Further, the carriage 120 includes an attachment plate 115 and a total of eight engaging portions 118 for movement that are fixed to the lower surface of the attachment plate 115 and that each slidably engage with a predetermined guide portion 113. The yoke fixing portion 100 is fixedly disposed on the upper surface of the mounting plate 115.

  The cart fixing means 125 constituting the horizontal movement means 130 includes a fixed pin insertion portion 121 attached to the cart 120 and a plurality of fixing pin insertion holes (not shown) provided in the base 110 at the above pitch. ) And a fixing pin 123 to be inserted into the fixing pin insertion portion 121 and the fixing pin insertion hole. In the illustrated example, one end of the fixing pin insertion portion 121 is also fixed to the yoke fixing portion 100.

  The user of the manufacturing apparatus 160 manually moves the carriage 120 and inserts the fixing pin 123 into each of the fixing pin insertion portion 121 and the fixing pin insertion hole. That is, the horizontal direction moving means 130 allows the user to manually move the carriage 120 on which the yoke fixing portion 100 is fixedly arranged in the horizontal direction, and has one fixed pin insertion portion 121 and one fixing pin insertion hole at each predetermined position. By manually inserting the fixing pin 123, the relative position of the insertion tool holding portion 110 with respect to the yoke 30 fixed to the yoke fixing portion 100 is displaced stepwise in the horizontal direction at the above pitch.

  The vertical moving means 150 includes a pedestal 131 disposed on the base 111 so as to straddle each guide portion 113, and an elevator 145 supported by the pedestal 131. The elevator 145 is attached to the insertion tool holding unit 110. Holder 135, a vertical guide 137 that guides the ascending / descending direction of the holder 135, a connecting part 139 that slidably engages the vertical guide 137, and connects the holder 135 and the vertical guide 137, and a holder A handle 141 is included which is mechanically coupled to the portion 135 and raises and lowers the holder portion 135. For example, when the handle 141 is manually rotated forward, the holder portion 135 is lowered along the vertical guide portion 137, and when the handle 141 is reversed, the holder portion 135 is raised along the vertical guide portion 137. As the holder part 135 is raised and lowered, the insertion tool holding part 110 held by the holder part 135 is also raised and lowered, and therefore the magnet insertion tool 20 held by the insertion tool holding part 110 is also raised and lowered.

  The vertical movement means 150 is configured so that the relative position of the insertion tool holding unit 110 with respect to the yoke 30 fixed to the yoke fixing unit 100 is set on the yoke fixing unit by the user of the manufacturing apparatus 150 manually operating the handle 141. 100 is displaced in the vertical direction. The relative position of the insertion tool holding part 110 with respect to the yoke 30 is such that one main surface of the permanent magnet 25 held by the magnet holding part 10 of the magnet insertion tool 20 and the inner plane of the yoke 30 are kept parallel to each other. To move vertically. The vertical movement means 150 is arranged so that one main surface of the permanent magnet 25 held by the magnet insertion tool 20 and the inner plane of the yoke 30 face each other at the relative bottom dead center of the vertical movement means 150. It is configured.

  A guide plate holder 155 is inserted at the bottom between the two inner planes of the yoke 30 so that a plurality of permanent magnets can be easily fixed to the inner plane of the yoke 30 at a fixed pitch. The end of the guide plate holder 155 is fixed to the yoke fixing part 100 by a fixing tool 157 such as a screw. The shape of the guide plate holder 155 when viewed from above is T-shaped, and the guide plate holder 155 includes the guide plate holder 155 described in Embodiment 1 (see FIG. 2). Similarly, slit-like openings are formed at the same pitch as the arrangement pitch. When a lower end portion of a guide plate (not shown) is inserted into these openings, a predetermined number of guide plates are arranged under the same pitch as the above arrangement pitch.

  As a guide plate held by the guide plate holder 155, for example, the guide plate 33a to 33h (see FIG. 2) described in the first embodiment has a T shape, and the guide plate holder 155 has the above-described shape. A material having a length that can be engaged with the upper surface of the guide plate engaging portion 105 in a state where the lower end portion is inserted into the opening is used. In the guide plate having such a shape, the lower surface of the region extending in the horizontal direction at the upper portion when standing is engaged with the upper surface of the guide plate engaging portion 105.

  In manufacturing the linear motor stator using the linear motor stator manufacturing apparatus 160 having the above-described configuration, the magnet holding step and the magnet attaching step described with reference to FIG. Is done. At this time, the positioning of the yoke 30 and the insertion tool holder 110 is performed by the user of the manufacturing apparatus 160 manually moving the carriage 120 to a predetermined position and fixing the position of the carriage 120 by the carriage fixing means 125. Done in This alignment is preferably performed prior to the magnet application process every time the magnet application process is performed.

  Moreover, as the adhesive applied to the permanent magnet 25 in order to fix the permanent magnet 25 to the yoke 30, an adhesive having a short curing time is preferable as described in the first embodiment. Therefore, the adhesive to the permanent magnet 25 is used. The application of the permanent magnet 25 to the magnet holder 10 of the magnet inserter 20 is performed after the magnet holder 20 is held by the inserter holder 110 and the positioning of the yoke 30 and the inserter holder 110 is completed. It is desirable to carry out in a held state. The insertion of the magnet insertion tool 20 between the two inner planes of the yoke 30 is performed by the user rotating the handle 141 in a predetermined direction. When the permanent magnet 25 is first fixed to the yoke 30, the suction plate 37 (see FIG. 2) is used as described in the first embodiment.

  According to the linear motor stator manufacturing apparatus 160, the linear motor stator can be manufactured by repeating the magnet holding process and the magnet attaching process described in the first embodiment as many times as necessary. Even if the magnet 30 is made of an integrally molded product of a ferromagnetic material, the permanent magnet array in which the height position (height position with reference to the upper surface of the yoke) and the arrangement pitch of the individual permanent magnets are arranged is the yoke 30. Can be easily formed. As a result, it becomes easy to manufacture a linear motor stator with low speed ripple and easy to obtain a linear motor with stable thrust at low cost.

  The linear motor manufacturing method, the linear motor, and the linear motor stator manufacturing apparatus according to the present invention have been described with reference to the embodiments. However, as described above, the present invention is limited to the above embodiments. Is not to be done.

  For example, in the magnet insertion tool described in the embodiment, a pair of magnet holding parts (two magnet holding parts) are arranged back to back. Magnet holders (four or more magnet holders) may be arranged back to back. One magnet holding portion in each pair is arranged on one side of the magnet insertion tool to form one group, and the other magnet holding portion is arranged on the opposite side to the above side to form another one group. . That is, in the magnet insertion tool of this invention, an even number of magnet holding parts are divided into two groups and arranged back to back.

  The magnet insertion tool can be configured so that the holding and releasing of the permanent magnets in each magnet holding part can be controlled for each magnet holding part, or the magnet insertion tool can be controlled for each group. You can also In addition, the magnet insertion tool can be configured such that the holding and releasing of the permanent magnets in each magnet holding part is controlled only uniformly. The magnet insertion tool 20 shown in FIG. 1 is configured to hold the permanent magnet 25 or release the holding by sliding the upper claw part 5 and the lower claw part 7 by manually rotating the handle 15. However, the permanent magnets are held or released by the upper and lower claw parts electrically (including those that slide the upper and lower claw parts using air pressure or hydraulic pressure). An insertion tool can also be constructed.

  The insertion depth when the magnet insertion tool is inserted between the two inner planes of the yoke can be regulated by using the guide plate holder disposed at the bottom between the two inner planes. In this case, for example, an engaging portion that engages with the guide plate holder and restricts the insertion depth of the magnet insertion tool is formed at the lower part of the magnet insertion tool. Further, in the embodiment, the arrangement pitch of the permanent magnets is controlled by providing a guide plate on the yoke. However, for example, by arranging a guide portion that regulates the distance between the permanent magnets on the magnet insertion tool, the permanent magnets are arranged. It is also possible to control the installation pitch.

  In any of the production of the linear motor stator and the linear motor stator production apparatus in the linear motor production method of the present invention, the number of magnet insertion tools to be used is not limited to one, Two or more desired numbers of magnet inserts can be used simultaneously. From the standpoint of reducing the manufacturing cost of the linear motor, it is preferable that the yoke is an integrally molded product of a ferromagnetic material. However, the linear motor manufacturing method of the present invention uses a yoke manufactured by combining a plurality of members. The present invention can also be applied when manufacturing a linear motor. Similarly, the linear motor stator manufacturing apparatus of the present invention can be used when manufacturing a linear motor stator using a yoke manufactured by combining a plurality of members. The vertical cross section of the yoke is not limited to the U shape described in the first embodiment, and may be a desired shape such as a U shape. The vertical cross section of the yoke can be appropriately selected according to the number of permanent magnet rows to be formed on the yoke, and the number of permanent magnet rows formed on the yoke can be a desired even number of 2 or more.

  When the horizontal moving means is configured using a carriage, the guide section that defines the movement path of the carriage is not limited to a rail shape like the guide sections 113 and 113 described in the second embodiment. It is also possible to do. Regardless of the configuration of the horizontal movement means, whether or not the guide plate engaging portion 105 (see FIG. 9) is provided in the yoke fixing portion can be appropriately selected. In order to prevent the guide plate held by the guide plate holder 155 (see FIG. 9) from swinging, it is desirable to make the contact area between each guide plate and the yoke 30 or the guide plate engaging portion 105 as wide as possible. .

  FIG. 10 is a front view schematically showing an example of a guide plate having a wide contact area with the guide plate engaging portion 105. The guide plate 170 shown in the figure has two engaging portions 170a having two engaging surfaces that are in contact with each other at right angles, and the two engaging surfaces formed on these engaging portions 170a are: The upper surface 105a or the inner surface 105b of the predetermined guide plate engaging portion 105 is engaged. For this reason, it is possible to prevent the swing when the guide plate holder 155 holds the guide plate rather than the guide plate having a total of two engaging portions that engage the upper surface of the guide plate engaging portion 105 with one engaging surface. easy. In FIG. 10, the guide plate 170 is smudged for easy understanding of the shape of the guide plate 170. Also, among the members shown in FIG. 10, those common to the members shown in FIG. 9 are given the same reference numerals as those used in FIG. 9 and description thereof is omitted. The shape of the guide plate used in the linear motor manufacturing method and the linear motor stator manufacturing apparatus of the present invention can be selected as appropriate.

  In addition to the above, the linear motor manufacturing method, the linear motor, and the linear motor stator manufacturing apparatus of the present invention can be variously modified, modified, combined, and the like.

It is a perspective view which shows roughly an example of the magnet insertion tool used at the magnet holding process in the manufacturing method of the linear motor of this invention. It is a perspective view which shows roughly an example of each of the yoke used by the magnet sticking process in the manufacturing method of the linear motor of this invention, and the guide plate arrange | positioned at this yoke. It is sectional drawing which shows schematically a state when the magnet insertion tool inserted in the yoke at the magnet sticking process in the manufacturing method of the linear motor of this invention is desired in the longitudinal direction of a yoke. It is sectional drawing which shows schematically the state just before attaching the first permanent magnet to a yoke at the magnet sticking process in the manufacturing method of the linear motor of this invention. It is a flowchart which shows an example of the work content until the stator of a linear motor is obtained among the work content performed when manufacturing a linear motor with the manufacturing method of the linear motor of this invention. It is a perspective view which shows roughly an example of the stator obtained according to the flowchart shown in FIG. 1 is a perspective view schematically showing an example of a linear motor of the present invention. It is a front view which shows roughly an example of the manufacturing apparatus of the stator for linear motors of this invention. It is a side view which shows roughly the manufacturing apparatus of the stator for linear motors shown in FIG. It is a front view which shows roughly an example of a guide plate with a wide contact area with the guide plate engaging part shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnet holding | maintenance part 17 Insertion depth control part 20 Magnet insertion tool 25 Flat magnetized permanent magnet 25a Main surface 30 of permanent magnet 30 Yoke 30a, 30b Inside plane 33a-33h of yoke Guide plate 35 Guide plate holding tool 40a, 40b Permanent magnet array 50 Stator 60 Movable element 70 Linear motor 100 Yoke fixing part 105 Guide plate 110 Insertion tool holding part 111 Base 113 Guide part 120 Dolly 125 Dolly fixing means 130 Horizontal direction moving means 131 Base 145 Elevator 150 Vertical direction moving means 155 Guide plate holder 160 Linear motor stator manufacturing apparatus 170 Guide plate

Claims (10)

A stator and a movable element that moves away from the stator, and the stator is formed on each of the two inner planes and a groove-shaped yoke having two inner planes facing each other. A method of manufacturing a linear motor having a permanent magnet array,
An even number of permanent magnets are formed of a non-magnetic material, and the even number of permanent magnets are detachably held in two groups and arranged back to back. A magnet holding step for holding the magnet in a state where an adhesive is applied to one main surface of each magnet and in a direction in which the one main surface is on the outside;
The magnet insertion tool is inserted between the two inner planes of the yoke so that the one main surface of each of the even number of permanent magnets held by the even number of magnet holding portions faces the inner plane of the yoke. Then, a magnet sticking step of releasing the holding of the permanent magnets by the magnet holding part and attracting each of the even number of permanent magnets to the inner plane of the yoke by the magnetic force of the permanent magnets;
The manufacturing method of the linear motor characterized by including.   The said magnet insertion tool has an insertion depth control part which contacts the upper surface of the said yoke and controls an insertion depth, when inserted between two inner side planes of the said yoke. Method for manufacturing a linear motor.   In the magnet sticking step, a guide plate is inserted between two inner planes of the yoke so as to be orthogonal to the arrangement direction of the permanent magnets in the permanent magnet row in a plan view, and the guide plate in the arrangement direction is inserted by the guide plate. The method for manufacturing a linear motor according to claim 1, wherein the attracting position of the permanent magnet is restricted.   The method of manufacturing a linear motor according to claim 1, wherein the yoke is an integrally molded product of a ferromagnetic material. A stator and a movable element that moves away from the stator, and the stator is formed on each of the two inner planes and a groove-shaped yoke having two inner planes facing each other. A linear motor having a permanent magnet array,
The linear motor manufactured by the manufacturing method as described in any one of Claims 1-4 using the integrally molded article of a ferromagnetic material as said yoke. A magnet insertion tool that inserts a permanent magnet between the two surfaces when sticking the permanent magnet to each of two surfaces facing each other,
It has an even number of magnet holding parts formed of a non-magnetic material and detachably holding a permanent magnet, and the even number of magnet holding parts are divided into two groups and arranged back to back. Magnet inserter. An apparatus for manufacturing a stator for a linear motor having a groove-shaped yoke having two inner planes facing each other and a permanent magnet array formed on each of the two inner planes,
A yoke fixing portion to which the yoke is fixed;
An even number of magnet holders formed of a non-magnetic material and detachably holding a permanent magnet are divided into two groups and arranged back to back;
An insertion tool holding part for holding the magnet insertion tool in a direction in which a normal line on one main surface of the permanent magnet is horizontal when the permanent magnet is held by the magnet holding part;
Horizontal moving means for displacing the relative position of the insertion tool holding portion with respect to the yoke fixed to the yoke fixing portion stepwise in the horizontal direction at the same pitch as the permanent magnet arrangement pitch in the permanent magnet row; ,
The relative position of the insertion tool holding part with respect to the yoke fixed to the yoke fixing part is determined while keeping one main surface of the permanent magnet held by the magnet holding part and the inner plane of the yoke parallel to each other. A vertical moving means for vertically displacing on the yoke fixing part;
And a magnet insertion tool holding a permanent magnet in the magnet holding part is held by the insertion tool holding part and moved by the vertical direction moving means to a relative bottom dead center in the vertical direction moving means. The linear motor stator manufacturing apparatus is characterized in that one main surface of the permanent magnet and the inner plane of the yoke face each other.   The apparatus for manufacturing a stator for a linear motor according to claim 7, further comprising a guide plate holder inserted into the yoke and holding the guide plate at the same pitch as the arrangement pitch. The horizontal movement means includes a carriage that engages with a guide portion provided on a base and moves along the guide portion, and a position of the carriage when the carriage moves along the guide portion. A carriage fixing means that can be fixed at the same pitch as the installation pitch,
The vertical direction moving means includes a gantry arranged to straddle the guide part, and an elevator supported by the gantry,
9. The apparatus for manufacturing a stator for a linear motor according to claim 7, wherein the yoke fixing portion is fixedly disposed on the carriage, and the insertion tool holding portion is attached to the elevator.   The said magnet insertion tool has an insertion depth control part which contact | connects the upper surface of the said yoke and controls an insertion depth, when inserted between two inner side planes of the said yoke. The manufacturing apparatus of the stator for linear motors as described in any one of these.

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