JPH1143852A - Motor assembly for automatic knitting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the moment of inertia and reduce the thickness of a motor by decreasing the weight of a mobile member of a linear motor for driving a knitting needle of an automatic knitting machine. SOLUTION: A mobile member 3 holding a jack 4 is reciprocated along a linear guide of a casing 1. In a linear motor having the above action, permanent magnets 8 are arranged on the side edge of the mobile member 3 in the moving direction. A comb-shaped iron core 10 formed by winding coils 12 on magnetic poles 11 is fixed to the casing 1 and the magnetic poles 11 are placed opposite to the side face of the permanent magnets 8 interposing a gap perpendicular to the thickness of the motor 1. Accordingly, the permanent magnets 8 attached to the mobile member and the iron core 10 fixed to the casing are placed on a plane to form a magnetic circuit in the direction of the plane. The thickness of the motor can be reduced since the gap and a yoke 9 are not superposed in the direction of thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin drive motor assembly for driving a knitting needle of an automatic knitting machine.

[0002]

2. Description of the Related Art For example, an automatic knitting machine is disclosed in
As shown in No. 855, jacks connected to a large number of knitting needles corresponding to the number of gauges are driven by linear motors, and the interval between the jacks attached to the linear motor is adjusted to the interval between the knitting needles. Since it is necessary to reduce the size, the linear motor is configured to be thin. A motor assembly of such an automatic knitting machine is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-260304.
The linear motors provided at positions close to and away from the knitting needles of the casing, respectively, and the linear motors provided symmetrically thereto operate four knitting needles with one motor assembly. For this reason, it is necessary to fit the thickness of this motor assembly to a pitch of four knitting needles. Therefore, in Japanese Patent Application Laid-Open No. 8-260304, permanent magnets are attached to the inner surface of the casing and the cover at four positions, respectively, facing each other, and a mover is arranged between the permanent magnets. The coreless coils of each phase formed in the above are aligned and fixed, and the mover is made thin,
By energizing the coreless coil by power supply from the casing, the mover assembly including the coreless coil is moved along a linear guide provided on the casing.

FIGS. 20 and 21 show an example of such a conventionally proposed linear motor for a knitting machine. The permanent magnets 63 having the number of poles corresponding to the moving range are provided on the inner surfaces of a casing 61 and a cover 62, respectively. 64 are provided at four positions, and between the permanent magnets, a movable element 66 in which doughnut-shaped flat ironless coils 65 of each phase are arranged and fixed with an adhesive or the like is arranged. 6
7 and a jack 68, the slider 67 is movably fitted to a linear guide 69 fixed to the casing 61, and the mover 66 is moved in the axial direction of the jack 68. 70 is a position sensor, 71 is a power supply circuit such as printed wiring provided on the casing 61,
The coreless coil 65 of the mover 66 via the flexible connection line 72
To excite.

[0004]

As described above, the permanent magnets 63 and 64, which are magnetic force generating means, are attached to the position facing the casing 61 and the cover 62 to form a magnetic field in the thickness direction of the motor. The coreless coils 65 of each phase are arranged and fixed to the movers 66 arranged between them. Therefore, it is necessary to flatten the coreless coil 65 to reduce its thickness and to mount it side by side so that it does not overlap. The surface area increases, the mover 66 becomes large, the weight increases, and the inertia increases. Since the permanent magnets 63 and 64 on both sides and the ironless coil 65 are arranged so as to overlap in the thickness direction of the motor, two gaps overlap and the entire thickness cannot be reduced. Further, the casing and the cover constitute a yoke by attaching a permanent magnet, and have a disadvantage that the motor as a whole becomes thick because it requires a thickness necessary to maintain the magnetic capacity. In order to make the operation of the knitting needle smooth, it is desired to reduce the weight of the movable part to reduce the inertia and also reduce the cogging torque. Further, in order to excite the ironless coil 65, it is necessary to connect the ironless coil 65 from a power supply circuit 71 fixed to the casing 61 via a flexible connection line 72,
The structure is also complicated.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a motor assembly of an automatic knitting machine for reciprocating a mover having a jack attached thereto in the direction of the jack along a guide of a casing. A permanent magnet is attached along the motor, and a permanent magnet is provided with a comb-shaped iron core that is to be opposed to the permanent magnet through a gap perpendicular to the thickness direction of the motor. Are formed in a direction perpendicular to the thickness direction, and the linear guide, the permanent magnet, and the iron core are arranged in a plane along the surface of the casing.

In addition, linear motors are provided in one casing at a position close to the knitting needle and at a position far from the knitting needle, and an extension in the moving direction is provided at a side edge of a movable element of each linear motor. A permanent magnet that forms a strong magnetic field is attached to the linear motor, and the permanent magnet is provided with a comb-shaped iron core that is opposed to the permanent magnet through a gap perpendicular to the thickness direction of the motor and is wound with a coil. By displacing the linear motor at a position farther from the knitting needle in the width direction of the casing than the linear motor, the extension portions are displaced in the direction of the gap so that the movers do not come into contact with each other even if the mover moves. ing. Also,
The permanent magnet and the iron core are opposed to each other via a space perpendicular to the thickness direction of the motor, so that a comb-shaped iron core integrally having a yoke can be used, and a magnetic path is provided in the casing and the cover. So there ’s no need to
The motor can be made thinner, and the casing, especially the cover, can be made thinner.
A convex portion is formed to increase the gap between the mover and the side edge portion to prevent contact, thereby improving the strength of the cover.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS For this purpose, a movable element having a U-shaped cross section which moves along a linear guide provided on a casing is provided, and a jack is attached to the movable element. Side by side permanent magnets,
The permanent magnet attached to the mover is opposed to a comb-shaped iron core around which a coil is wound via a gap perpendicular to the thickness direction of the motor, and the linear guide, the permanent magnet and the iron core are formed in a casing. Are arranged in a plane along the surface. The permanent magnet can be provided on one side or both sides of the mover. Therefore, the permanent magnet and the coil are arranged so as not to overlap in the thickness direction of the motor, and the coil is excited to generate a magnetic field perpendicular to the thickness direction to move the mover. The permanent magnet may be attached to the side surface of the U-shaped mover via a yoke.

[0008] The movable element is formed in a lightweight support plate shape,
Permanent magnets are attached to one side edge of this mover or to both side edges with the linear guide in between, and the iron core with the coil wound facing the side of the permanent magnet row is aligned with the motor thickness direction. Are provided through a right-angled space. The mover may be provided on one side of the linear guide and a permanent magnet may be attached to a side edge thereof, or may be provided on both sides of the linear guide to balance the mover. Also, with a permanent magnet attached along the side edge of the mover constituted by the support plate, an iron core wound with a coil can be provided facing both outer and inner side surfaces of the permanent magnet row. , The thrust is increased, and the magnetic attraction of the iron core acts on both sides of the permanent magnet to balance the permanent magnet and prevent the bending force applied to the mover.The number of permanent magnets attached to the mover and the As for the number of magnetic poles, one of them may be a number corresponding to the moving range of the mover, and the other may be provided with a number corresponding to at least one set of each phase magnetic pole. If provided, an extension may be provided in which the side edge of the mover protrudes in the movement direction, and a necessary number of permanent magnets may be attached.

In the permanent magnet, the poles are arranged side by side in the direction of movement, and the permanent magnets forming the respective poles or the magnetized regions are diamond-shaped or trapezoidal, and the joint surfaces with the permanent magnets of adjacent different poles are formed. Skew can be provided by inclining the armature in the moving direction of the mover. When a three-phase coil is provided on a comb-shaped iron core, the gap between the magnetic poles at the center of the core is made larger than the gap between the magnetic poles at both ends to balance the magnetic attraction with the permanent magnets of each phase. By doing so, the cogging torque is reduced. Further, the comb-shaped magnetic pole of the iron core fixed to the casing may have a pole piece, but in order to facilitate molding of the coil, the coil is formed in a shape without the pole piece, and a preformed coil is inserted into the magnetic pole. It is better to do so. If the shape of the magnetic poles is trapezoidal, the insertion of the molded coil can be facilitated and the leakage magnetic flux between the magnetic poles can be reduced. The iron core with the coil wound in this way is integrally molded with the coil to prevent damage to the coil, improve the cooling effect of the coil by heat conduction of the resin, and ensure the attachment to the casing. be able to.

The linear motor thus formed can be mounted in a plurality of sets on a single casing in the same manner as in the prior art, and the permanent magnet corresponding to the moving range can be extended by extending the side edge of the mover. When the linear motor is located closer to the knitting needle, the linear motor is displaced to the outside of the casing from the linear motor farther from the knitting needle, and at the moving position where the movable elements are close to each other, the position of the movable element is set so that the extended portions do not contact each other. Is biased. Also, by making the permanent magnet and the iron core face each other with a gap perpendicular to the thickness direction of the motor, the yoke can be provided on the iron core, and there is no need to form a magnetic path in the casing or cover. A cover to configure the circuit is not required, the cover for protection can be formed by a thin plate, and the strength of the cover is increased by forming a concave part that holds down the iron core and a convex part that increases the distance between the mover and the cover surface. can do.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIG. FIGS. 1 and 2 show a first embodiment of the present invention, in which one linear motor is formed in a casing. Reference numeral 1 denotes a casing, which is press-formed with SUS304, for example. Reference numeral 2 denotes a cover, which is made of an iron plate in consideration of magnetic shielding when the linear motors are arranged in the thickness direction. The casing 1 may be a flat plate, and the cover 2 may be a box. Reference numeral 3 denotes a mover, for example, a stainless plate having a U-shaped cross section. Reference numeral 4 denotes a jack attached to the mover, and connects a tip (not shown) to the knitting needle. Reference numeral 5 denotes a linear guide provided on the casing 1 for supporting the mover 3 by inserting balls 6 into ball grooves provided on both sides fitted with the mover 3 and moving the mover 3 in the direction of the jack 4. The linear bearing is constructed. Reference numeral 8 denotes a permanent magnet mounted on one outer surface of the mover 3 via a yoke 9, and has a large number of N poles and S poles alternately provided in the moving direction. The permanent magnet 8 can be made of a ferrite, a rare earth permanent magnet, a synthetic resin magnet, or the like. When the mover 3 is made of a magnetic material, the yoke 9 can be omitted. Reference numeral 10 denotes an iron core attached to the casing 1, which faces a side surface of the permanent magnet 8 provided on the mover 3 via a gap perpendicular to the thickness direction of the motor, and has an electrical angle of 360 ± 60 °. It is formed in a flattened tooth shape with magnetic poles 11 at intervals. 12
Is a coil wound around the magnetic pole 11, and U, V, and W are coil terminals.

The iron core 10 can be a magnetic pole having a pole piece formed on the pole head. However, if the pole piece is omitted and a magnetic pole having the same width as the root of the pole is provided,
If a preformed coil can be inserted and a trapezoidal magnetic pole is used as shown in this embodiment, the formed coil can be easily inserted and the leakage magnetic flux between the magnetic poles can be reduced to reduce the magnetic efficiency. It has the advantage of increasing the torque characteristics and improving the operation of the mover. Reference numeral 13 denotes a position sensor provided on the casing.
The position of the mover 3 is detected by the combination of 1
Reference numerals 5 and 16 denote coil holes provided in the casing 1 and the cover 2 for inserting the coil 12 so as to reduce the thickness T of the entire motor. Therefore, the linear guide 5
The permanent magnet 8 and the iron core 10 are arranged on a plane parallel to the bottom surface of the casing 1, and the thickness T of the motor is determined by the outer diameter of the coil 12 wound around the iron core 10. When the coil 12 is excited by a control device (not shown), the magnetic pole 11 and the permanent magnet 8
Generates a three-phase moving magnetic field between the movable member 3 and the permanent magnet 8 along the linear guide 5,
Operate the knitting needle connected to. By feeding back the detection signal of the position sensor 13 to the control device of the knitting needle, the knitting needle is driven by a desired movement.

FIGS. 3 and 4 show a second embodiment, in which the same parts as those in FIG. 1 are denoted by the same reference numerals. In this embodiment, the mover 3 is made of a light metal such as an aluminum alloy or a synthetic resin in the form of a support plate. 6 is supported. The permanent magnet 8 is attached via a yoke 9 to an outer surface of a bent portion 3 a formed on one side edge of the mover 3. The iron core 10 has magnetic poles 11 over the movable range of the mover 3.
And the coil 12 is wound therearound. In addition, although the coil hole 15 is provided only in the casing 1 in the figure,
A coil hole can also be provided on the cover 2 side. Therefore, in this embodiment, the movable member 3 is moved to operate the jack 4 by exciting the coil 12 in the same manner as in the first embodiment, but the iron core 10 is provided over the movable range of the movable member 3. Therefore, the number of permanent magnets 8 attached to the mover 3 can be reduced, and the weight of the mover can be reduced.

FIGS. 5 and 6 show a third embodiment, and FIGS.
The same parts as those in FIG. 4 are denoted by the same reference numerals. The mover 3 is formed symmetrically with respect to the slider 7 fitted to the linear guide 5, and has an extension 3b having both side edges protruding in the movement direction.
A permanent magnet 8 is attached to a side edge portion including a yoke 9 via a yoke 9, and iron cores 10, 20 opposed to the permanent magnets on both sides, respectively.
Is fixed to the casing 1. As described above, by generating moving magnetic fields in the same direction by the iron cores 10 and 20 at both side edges of the mover 3, the thrust applied to the mover 3 is increased, and the left and right sides of the mover 3 are made symmetrical. Balancing is performed without causing bending or distortion of the mover 3, the moving operation is smooth, and the durability of the linear bearing is improved. In order to reduce the weight of the mover 3, the yoke 9 is not provided on the mover 3, but is fixed to the casing 1 via a gap on the side opposite to the iron core 10 with the permanent magnet 8 therebetween. The magnetic path of the magnet 8 can be configured, and in this case, it is desirable to use a laminated core yoke in consideration of the iron loss of the yoke.

FIGS. 7 and 8 show the extension 3b of the mover 3.
With the permanent magnet 8 attached along the side edge including
In the fourth embodiment in which the iron cores 10 and 20 are opposed to both side surfaces, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals. The mover 3 to which the jack 4 is attached is formed in a plate-like manner as in the second embodiment, and has an extension 3b protruding from one side edge on both sides.
The permanent magnet 8 having the number of magnetic poles corresponding to the moving range is attached to the lower surface of the side edge including the b. For this reason, for example, as shown in FIG. 9, separates 17 are integrally formed at the pitch of the permanent magnets on the lower surface of the side edge of the mover 3, and the permanent magnets 8 are formed.
Is inserted and bonded, the permanent magnet 8 can be reliably supported. 1a are notches provided on both sides of the casing 1 so that the extension 3b of the mover 3 projects from the casing when the mover 3 moves. Reference numerals 10 and 20 denote comb-shaped iron cores which are opposed to both surfaces of the permanent magnet 8 via a gap, respectively. In this embodiment, each phase has three coils having an electrical angle of 160 °.
A phase winding is provided and fixed to the casing 1. In order to prevent the thickness of the entire motor from increasing,
The core 20 disposed below the armature 10 is the core 10 outside the mover.
Although the stack thickness is smaller than that of the
It is also possible to use the same one.

In this embodiment, when the iron cores 10 and 20 on both sides are excited in the same direction by the coil 12, the thrust of both the iron cores is applied to the mover 3 and the movement of the mover 3 is ensured. Since the cores 10 and 20 attract the permanent magnets 8 from both sides and hold them at an intermediate position between the iron cores, the weight of the permanent magnets 8 applied to the mover 3 is reduced, and distortion of the mover 3 can be prevented. Since the permanent magnets 8 are held at the center positions of the magnetic poles by the magnetic attraction forces on both sides, even when the gap between the permanent magnets 8 on the casing 1 side is reduced, no contact occurs during movement. In the embodiment shown in FIG. 7, iron cores 10, 2
Since the yoke is omitted by opposing 0, it is necessary to make adjustment so that the opposing magnetic poles have the same phase and the excitation direction is the same so that the magnetic flux by the magnetic poles on both sides is not canceled out. As shown by the dashed line, if a yoke is inserted in the cutout 18 in the separate 17 and the magnetic field of the permanent magnet is divided on both sides, the degree of freedom in coil design can be obtained.
Further, a laminated yoke may be used in place of one iron core 20.

In the first, third and fourth embodiments shown in FIGS. 1, 5 and 7, six or nine magnetic poles are provided on the iron core with three-phase windings, Although a large number of permanent magnets corresponding to the moving range are provided on the movable member 3, the permanent magnets having a large number of magnetic poles extending over the moving range are provided on the iron cores 10 and 20 as in the second embodiment shown in FIG. The number of magnets may be reduced to make the mover 3 lighter. Further, the permanent magnets and the magnetic poles of the second embodiment shown in FIG. 3 are provided in accordance with the movement range of the permanent magnets 8 as in the third embodiment of FIG. Can also. Further, in each of the embodiments, the iron cores 10, 2
FIG. 10 shows the shape of the facing surface of the permanent magnet 8 facing
As shown in FIG. 10 (a), an N-pole and an S-pole adjacent to each other in a rectangular shape are generally arranged at a vertical joining surface 19, but are formed in a diamond shape as shown in FIG. 10 (b). Alternatively, by providing a skew on the joint surface 19 in a trapezoidal shape as shown in FIG. 10C, the cogging torque can be reduced. Since the coil 12 is fixedly provided on the casing 1, there is no relation to the weight of the mover 3 and there is no need to use a coreless core as in the conventional case.
0 and 20 are provided, and the magnetic pole side surface of the iron core can be inclined to obtain a skew effect.

FIG. 11 shows a comb-shaped iron core 10 having 9 magnetic poles.
FIG. 4 is an explanatory diagram showing the relationship of magnetic paths when a set of three-phase windings is provided. As shown in FIG. 11A, the magnetic flux generated in the U-phase magnetic pole disposed in the center of the iron core 10 is formed on both sides together with the magnetic paths φ ₁ and φ ₂ passing through the adjacent in-phase magnetic poles U and U from the U-phase magnetic pole. Magnetic paths φ ₃ and φ ₄ passing through the W-phase magnetic pole and the V-phase magnetic pole
To form However, as shown in FIG.
The magnetic fluxes of the V-phase magnetic poles disposed at the end of the zero point are formed by magnetic paths φ ₁ , φ ₂ passing through adjacent in-phase magnetic poles and U magnetic fluxes at the center of the iron core.
A magnetic path φ ₃ passing through the phase magnetic poles is formed, but the magnetic path on the end side of the iron core has a high magnetic resistance because there is no iron core. The same applies to the W phase at the other end. For this reason, the magnetic attraction of the central U-phase magnetic pole increases, and the permanent magnet 8 tends to be drawn to the central portion of the iron core 10. Therefore, the cogging torque can be reduced by increasing the air gap between the magnetic poles of the phases arranged at the center and adjusting the strength of the magnetic field to balance the magnetic attraction of each phase.

In each of the embodiments shown in FIGS. 1, 3 and 7, a single linear motor is provided in the casing, but a plurality of linear motors are attached to one casing as in the conventional example. 12 and 13
Is a fifth embodiment showing an example in which four linear motors similar to those shown in FIG. 7 are provided in a casing. 12 to 19, 1 is a flat casing, 2 is a thin box-shaped cover, 31, 32, 33, and 34 are linear motors, 3 is a mover and has an extension 3b at a side edge thereof, The permanent magnet 8 is attached to the side edge including the extension 3b. 41, 42, 43 and 44 are jacks attached to each linear motor, 5 is a linear guide, 6 is a ball, 7 is a slider attached to the mover 3, 13 is a position sensor, 14
Is a detection piece, 30 is a stopper of the casing, 35 is a jack mounting plate provided on the mover of the linear motors 31, 33, 3
6 is a concave portion provided on the cover 2 and 37 is a convex portion. A control board 50 is attached to the casing 1 and includes a control element 51.
Other elements not shown are provided. 52 is a connection plug, 53 is a lead wire for supplying power from the control board to the coil,
Numeral 54 is a connection line between the coils, and when it is close to the control board 50, it is connected to a printed wiring 55 of the board and held. 56 is a signal line of the position detector. On one side of the flat casing 1, a linear motor 31 provided at a position near a knitting needle (not shown) and a linear motor 32 provided at a position distant from the knitting needle are provided. On the other side, linear motors 33 and 34 are provided symmetrically with the linear motor. The linear motors 31 and 33 close to the knitting needles are arranged closer to the outside of the casing 1 than the linear motors 32 and 34 far from the knitting needles to offset the position of the extension 3b provided on the mover 3 so that the movers approach each other. The extended portions 3b do not come into contact with each other even if they are moved to the position shown in FIG.

Reference numerals 21A, 21B, 22A, and 22B denote molded iron cores. As shown in FIGS. 14 and 15, the same molded coils 12 are inserted into the magnetic poles of the comb-shaped laminated iron core 10, connected, and then heat-cured. The magnetic pole surface is thinly covered in the drawing, but may be exposed. Reference numeral 23 denotes a coil portion of each molded iron core. At both ends thereof, mounting seats 24 are formed, and on a lower surface, a step portion 25 to be fitted into the coil hole 15 of the casing is formed. Reference numeral 26 denotes a connection portion integral with the coil portion, which internally connects the coils to each other, has a substrate 27 protruding from both sides, and has connection terminals provided at both ends on the rear surface of the substrate 27 as shown in FIG. The molded iron cores 21A and 21B are arranged so as to face the outside of the permanent magnet 8 with a large thickness.
A and 22B are arranged so as to face the inside of the permanent magnet 8 with a reduced thickness. Reference numeral 28 denotes an identification mark provided on the surface of the substrate 27, for example, to distinguish the connection of the coil. The linear motor 31 is composed of molded iron cores 21A and 22B.
As shown in FIG. 16, the connection terminal 21a provided on the substrate of the molded core 21A is connected to a power supply by a lead wire 53, and the other connection terminal 21b and the molded core 2 are used.
The connection terminal 22c of 2B is connected with the connection line 54, and the connection terminal 22d is short-circuited with the neutral point. When the jack 41 is moved, power is supplied from the connection terminal 21a through the lead wire 53, passes through the molded iron core 21A, and passes through the connection terminal 21a.
From b, the connection terminal 22c of the molded iron core 22B is entered via the connection wire 54, and the coil 12 of the molded iron cores 21A and 22B is excited with the connection terminal 22d as a neutral point.

The linear motor 32 has molded iron cores 21B and 22A, and the linear motor 33 has molded iron cores 21B and 22A.
A, the linear motor 34 combines the molded iron cores 21A and 22B, connects the connection terminals 21a and 21c to a power source, and connects the connection terminals 21b and 22c and 21d and 22d.
a are connected by a connection line 54, and the connection terminals 22b and 22d are connected to each other so as to be short-circuited as a neutral point. Since the connection terminals 22b and 22d at the neutral point are arranged on the side facing the linear motor, the lead wires 53 and the connection wires 54 are provided on the outer peripheral side of the casing and can be arranged so as not to contact the moving mover. .

FIGS. 17, 18 and 19 show an embodiment showing the cover 2 for covering the linear motor of FIG. 12, in which a thin metal plate is press-formed and hits the upper surface of a molded iron core arranged outside the permanent magnet. A concave portion 36 is formed in a portion, and a convex portion 37 is formed in a portion facing the mover 3.
Therefore, when attached to the casing 1, the recess 3
6 serves as a support for the thin cover by holding down the coil portion 23 of the molded iron core, increasing the distance between the mover 3 and the convex portion 37 to prevent contact with the mover, and increasing the strength of the cover surface to reduce bending and Deformation can be prevented. When the cover 2 is attached to the casing 1, the engaging edges 3
8 can be protruded and inserted into a guide groove provided in a locker (not shown) of the knitting machine, but a number of motor assemblies are closely inserted into the rocker of the knitting machine.
When removing the inserted motor assembly, the control board 50
If the user pulls out the board while holding it, the board may be damaged. For this reason, an operation piece 39 whose end is bent into an L shape is attached to the opposite side of the cover 2 from the jack take-out side, and the operation piece 39 is hooked and pulled out, so that the connection plug 52 is easily pulled out, and the casing is removed. You can easily take it out of the rocker with it. Also, when inserting the cover 2 with the operation piece 39, the cover 2 can be pushed into the rocker.
The casing 1 is pushed down to the stopper 30, and the connection plug 52 is securely inserted and connected.

[0023]

As described above, according to the present invention, a permanent magnet for forming a magnetic field of a linear motor is mounted on a mover, and an iron core on which a coil is wound is provided on the side of the permanent magnet with a gap perpendicular to the thickness direction of the motor. , The linear guide and the permanent magnet and the iron core for supporting and moving the mover are arranged in a plane on the casing,
The magnetic gap between the permanent magnet and the iron core does not extend in the thickness direction of the motor, so that the thickness of the motor is not increased due to the magnetic gap, and the entire linear motor can be configured flat. And the thrust can be increased. In addition, since the coil is attached to the casing, the structure of the mover is simplified, the inertia is reduced by reducing the weight of the mover, the responsiveness of the jack moving operation is improved, and the coil is provided with an iron core. This improves the magnetic efficiency as compared with a coreless coil and simplifies power supply to the coil. Furthermore, since the direction of the magnetic field of the permanent magnet is parallel to the surface of the casing, the thickness of the motor does not increase even if a comb-shaped iron core having a yoke on the opposite side of the magnetic pole facing the permanent magnet is used. It is not necessary to provide a magnetic path in the casing and the cover, and the casing, particularly the cover, can be made thin. There is almost no leakage of magnetic flux in the thickness direction of the motor, and even when the motor assemblies are stacked, mutual magnetic shielding is sufficiently performed by the casing, so that the cover can be eliminated.

The movable element is formed in a U-shape that moves along a guide, and a permanent magnet is attached to the side surface of the movable element, thereby simplifying the movable element, increasing rigidity, and facilitating handling. can get. Further, by configuring the mover with a support plate using a lightweight material, the mover can be made lighter, and the slider fitted to the linear guide can be made of another material having high wear resistance. Also,
Permanent magnets can be provided on one or both side edges of the mover, and if provided on both sides, the thrust of the motor will be increased, and the mover will be balanced on the left and right sides to prevent bending and distortion of the mover be able to. In addition, since the permanent magnet is attached to the side edge of the mover, the coil and the iron core can be provided so as to face one or both surfaces of the permanent magnet. The applied magnetic attraction force is balanced, the position of the permanent magnet is reliably maintained, and no contact occurs even if the gap between the permanent magnet and the casing is reduced.

Since the permanent magnets are arranged side by side on the side of the mover, the skew effect can be obtained and the cogging torque can be reduced by inclining the joint surface between adjacent magnetic poles in the moving direction of the mover. However, the mover can be smoothly moved, and if the magnetic poles of the iron core are formed in a trapezoidal shape so that the magnetic pole heads are small, the leakage magnetic flux can be reduced and a strong thrust can be obtained. In a linear motor, the iron core is formed in a straight line, and both ends of the iron core are not magnetically continuous.
In the case where the iron core is provided with a three-phase winding and the number of permanent magnets corresponding to the moving range is provided opposite to the iron core, the magnetic attraction force acting on the mover tends to increase in the center of the iron core.
By making the gap between the magnetic poles at the center of the iron core larger than the gap between the magnetic poles at the ends, the magnetic attractive force is made uniform and the cogging torque is reduced. In addition, it has a comb-shaped iron core, a coil formed in the same shape is inserted into the magnetic pole, the necessary connection can be made at the connection part, the coil can be easily formed, and the iron core around which this coil is wound, By resin molding together with the coil, it is possible to prevent disconnection and damage of the coil at the time of assembly, etc., it is easy to mount it on the casing, and if the connection distinction by the arrangement position is displayed on the mold surface, the coil at the time of assembly Can be easily combined and incorrect connection can be prevented. In addition, by molding the coil together with the iron core, there is an advantage that the resin mold is brought into contact with the casing or the cover to obtain a cooling effect by heat transmission.

In the case where the linear motors are arranged on one side of the casing closer to the knitting needle and on the side farther from the knitting needle, the linear motor on the side closer to the knitting needle is arranged outside the linear motor on the side farther from the knitting needle in the width direction of the casing. If the positions of the permanent magnets attached to the movers are shifted, interference between the movers due to the movement can be eliminated. The jack attached to the linear motor closer to the knitting needle is shorter and lighter than the jack of the linear motor farther from the knitting needle, so the short jack is attached via the jack attaching plate to eliminate the weight difference between the jack attaching plate. In this way, the effect of equalizing the moving speed of the jack and preventing the stitch variation can be obtained. Also, since the cover can be made of a thin material, the concave portion for holding down the iron core on the surface and the convex portion for increasing the interval between the side edges of the mover increase the mechanical strength, Cooling of the coil is performed by contact with the iron core, and contact during movement of the mover can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention, in which a part of a coil except a cover is shown in cross section.

FIG. 2 is a sectional view taken along the line AA in the embodiment of FIG.

FIG. 3 is a plan view showing a second embodiment of the present invention, in which a part of a coil is sectioned without a cover.

FIG. 4 is a central cross-sectional view of the embodiment of FIG.

FIG. 5 is a plan view of a third embodiment of the present invention, from which a cover is removed.

FIG. 6 is a central cross-sectional view in the embodiment of FIG. 5;

FIG. 7 is a plan view showing a fourth embodiment of the present invention, in which a part of the mover is cut away except a cover.

8 is a sectional view taken along the line BB of the embodiment shown in FIG. 7;

FIG. 9 is an enlarged perspective view of a part of the mover in the embodiment of FIG. 7;

FIG. 10 is a front view showing an example of arrangement of permanent magnets.

FIG. 11 is an explanatory diagram showing a magnetic path of a three-phase winding in a linear iron core.

FIG. 12 is a plan view of a fifth embodiment of the present invention, from which a cover is removed.

13 is a partial cross-sectional view taken along the line CC of FIG.

FIG. 14 is a perspective view showing a mold core.

FIG. 15 is a cross-sectional view of a part of the back surface of the mold core.

FIG. 16 is a connection diagram showing a connection example of a mold core.

FIG. 17 is a plan view showing an embodiment of a cover.

FIG. 18 is a sectional view taken along line DD of FIG. 16;

FIG. 19 is a side view taken along the line EE in FIG. 16;

FIG. 20 is a plan view of a conventional example without a cover.

FIG. 21 is a sectional view taken along line FF of FIG. 20;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 1a Notch 2 Cover 3 Mover 3a Bending part 3b Extension part 4 Jack 5 Linear guide 6 Ball 7 Slider 8 Permanent magnet 9 Yoke 10, 20 Iron core 11 Magnetic pole 12 Coil 13 Position sensor 14 Detection piece 15, 16 Coil hole 17 Separate 18 Cut groove 19 Joining surface 21A, 21B, 22A, 22B Mold iron core 21a, 21b, 21c, 21d Connection terminal 22a, 22b, 22c, 22d Connection terminal 23 Coil part 24 Mounting seat 25 Step 26 Connection part 27 Substrate 28 Identification mark 30 Stopper 31, 32, 33, 34 Linear motor 35 Jack mounting plate 36 Concave portion 37 Convex portion 38 Engagement edge 39 Operation piece 41, 42, 43, 44 Jack 50 Control board 51 Control element 52 Connection plug 53 Lead wire 54 Connection Line 55 mark Wire 56 signal lines 61 casing 62 covers 63, 64 the permanent magnet 65 no iron core coil 66 movable element 67 the slider 68 jack 69 linear guide 70 position sensor 71 power supply circuit 72 flexible connecting wire T motor thick U, V, W coil terminal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masago Isayama 31 Yoshihiro Kita, Iizuka City, Fukuoka Prefecture Inside Wi-E Drive Co., Ltd.

Claims (18)

[Claims] A movable member reciprocatingly moved along a linear guide provided on a casing, and a jack mounted thereon; and a movable member arranged side by side in a moving direction along a side edge of the movable member.
A permanent magnet forming a magnetic field, a comb-shaped iron core facing the permanent magnet via a gap perpendicular to the thickness direction of the motor, and a coil wound around magnetic poles of the iron core; A motor assembly for an automatic knitting machine, comprising a linear motor in which a linear guide, a permanent magnet and an iron core are arranged in a plane in a casing. 2. A single casing comprising a linear motor disposed on a side close to the knitting needle and a linear motor disposed on a side far from the knitting needle, wherein each of the linear motors reciprocates along a linear guide provided on the casing; A permanent magnet that is mounted side by side in the direction of movement along the side edge of the armature and forms a magnetic field; and a comb-shaped iron core that faces the permanent magnet via a gap perpendicular to the thickness direction of the motor. A motor assembly for an automatic knitting machine, comprising: a coil wound around a magnetic pole of the iron core, the linear guide, a permanent magnet, and an iron core arranged in a plane on a casing, and a jack attached to the mover. . 3. The linear motor on the side close to the knitting needle,
3. The motor assembly for an automatic knitting machine according to claim 2, wherein the motor is provided at a position offset in the width direction of the casing from the linear motor farther from the knitting needle, so that the movers do not contact each other when approached. 4. A short jack is attached to the mover of the linear motor closer to the knitting needle via a jack mounting plate, and the weight difference between the long jack attached to the linear motor farther from the knitting needle and the short jack is jack-attached. 4. The motor assembly of an automatic knitting machine according to claim 3, wherein the plate is made equal. 5. The mover is formed in a U-shaped cross section that moves along a guide, a permanent magnet is attached to an outer surface thereof, and an iron core facing the permanent magnet is provided on a side of the mover. A motor assembly for an automatic knitting machine according to claim 1 or 2. 6. The mover is constituted by a support plate parallel to a casing, a permanent magnet is attached along one side edge of the mover, and a side surface of the permanent magnet is arranged on a side of the motor in a thickness direction of the motor. 5. The motor assembly of an automatic knitting machine according to claim 1, further comprising an iron core opposed to the iron core via a gap at right angles. 7. The mover is constituted by a support plate parallel to a casing, and permanent magnets are attached along both side edges of the mover, and a thickness direction of a motor is attached to a side surface of each of the permanent magnets. 5. A motor assembly for an automatic knitting machine according to claim 1, further comprising an iron core facing through an air gap perpendicular to the motor. 8. The motor according to claim 1, wherein the iron core is provided on one side surface of a permanent magnet mounted along a side edge of a support plate constituting a mover, with a gap perpendicular to a thickness direction of the motor. A motor assembly for an automatic knitting machine according to any one of claims 1 to 4, or 6 or 7. 9. The iron core is provided on both sides of a permanent magnet attached along a side edge of a support plate constituting a mover, with a gap perpendicular to the thickness direction of the motor. A motor assembly for an automatic knitting machine according to any one of claims 1 to 4, or 6 or 7. 10. The movable element according to claim 1, wherein a permanent magnet corresponding to at least one set of each phase magnetic pole is provided on the movable element, and the iron core has a number of magnetic poles corresponding to a moving range of the movable element. The motor assembly of the automatic knitting machine described. 11. The mover according to claim 1, wherein the mover has a number of magnetic poles corresponding to a moving range of the mover, and an iron core facing the mover has at least one set of each phase coil.
A motor assembly for an automatic knitting machine according to any one of the above. 12. An extension in the moving direction is provided at a side edge of the mover, and a permanent magnet having a number of magnetic poles corresponding to a moving range is attached along the side edge including the extension, A side face is provided with an iron core opposed to the motor through a gap in a direction perpendicular to the thickness direction of the motor.
A motor assembly for an automatic knitting machine according to any one of claims 1 to 4 or 6 to 9 or 11, comprising a set of phase coils. 13. The permanent magnet according to claim 1, wherein a joining surface between adjacent magnets is inclined in a moving direction of the mover.
13. The motor assembly for an automatic knitting machine according to any one of claims 12 to 12. 14. The motor assembly of an automatic knitting machine according to claim 1, wherein the magnetic poles of the iron core are formed in a trapezoidal shape with a reduced magnetic pole head. 15. The iron core according to claim 1, wherein a three-phase winding is provided on the iron core, and a magnetic pole of a phase in a central part of the iron core is opposed to a permanent magnet with a gap larger than a magnetic pole of an end part. Automatic knitting machine motor assembly. 16. The motor assembly of an automatic knitting machine according to claim 1, wherein said iron core is resin-molded together with a coil. 17. A cover for covering a linear motor attached to a casing, wherein the cover has a concave portion for holding down an iron core and a convex portion for increasing a distance between a side edge portion of the mover to which a permanent magnet is attached. A motor assembly for an automatic knitting machine according to any one of claims 1 to 16. 18. The motor assembly for an automatic knitting machine according to claim 1, further comprising a cover for covering the linear motor attached to the casing, and an operation piece protruding from a side of the cover opposite to the jack outlet side.