JP2010148233A - Linear motor driving and feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase alternating current movable magnet type linear motor having a lightweight moving member and excellent responsiveness. <P>SOLUTION: In the three-phase alternating current movable magnet type linear motor 2, a coil unit 36 applied with each current of three-phases is mounted on a coil holding wall 24 made of a non-magnetic material, each of magnet constituents 8a, 8b is provided with: a movable base body 6 made of the non-magnetic material, which is movably guided and has a mounting surface parallel to the moving direction; a plurality of main magnets 40, 42, each of which is arranged with a spacing in the moving direction of the movable base body and has an N-pole and an S-pole alternatively magnetized and mounted at intervals so as to be opposite to a stator side 24; and a plurality of auxiliary magnets 44 arranged and installed so as to hold the respective main magnets in the moving direction, respectively. As for the respective auxiliary magnets, the main magnets are disposed so that the magnet poles on the side opposite to the respective main magnets becomes the same as those on the side opposite to coreless coils 30, 32, 34 on the stator side 24. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a three-phase AC linear motor used in various industrial machines such as machine tools, electrical component mounting devices, and semiconductor-related devices, and more particularly to a three-phase configuration in which a field is a mover and an armature is a stator. The present invention relates to an AC movable magnet type linear motor.

  As a three-phase alternating current movable magnet type linear motor having a magnet as a mover and an armature (coreless coil) as a stator, one described in Patent Document 1 is known. This is because, as a stator, a first coil unit including a drive coil, a sensor, and an energization control circuit and a second coil unit including a drive coil, an energization control circuit, and no sensor are aligned in the front-rear direction position. Are arranged in parallel, and two sets of permanent magnets corresponding to the first and second coil units are arranged in parallel in the front-rear direction as the mover. An energization permission signal is output to each energization control circuit of the second coil unit, while the first energization control circuit of the first and second coil units receives the first energization control circuit by the detection signal from the sensor of the first coil unit. In addition, each drive coil of the second coil unit is energized. The thrust generated in the permanent magnet of the mover basically conforms to Fleming's left-hand rule. (However, although Fleming's left-hand rule is applied to the drive coil, the drive coil is fixed here, so that a thrust as a reaction force of the force acting on the drive coil is generated in the permanent magnet.)

In this way, the first and second coil units are arranged in parallel, and the two sets of permanent magnets facing each other are arranged in parallel, thereby reducing the stroke without increasing the length of the mover. Without increasing thrust.
JP 2004-166331 A

  However, the technique disclosed in Patent Document 1 has a problem in that since the plurality of permanent magnets are fixed to the magnet yoke, the mass of the mover increases and the responsiveness is poor. In addition, when the magnetic flux from the movable magnet crosses the metal, it is necessary to consider the universal problem that an eddy current is generated to reduce the thrust of the mover.

  The present invention has been made in view of the conventional problems, and it is an object of the present invention to provide a three-phase AC movable magnet type linear motor that is lightweight and has good responsiveness.

  In order to solve the above-mentioned problem, the structural feature of the invention according to claim 1 is that the current phase is 120 degrees each with respect to the mover side having a magnet structure in which a plurality of magnets are arranged along the moving direction. And the stator side in which the coil units in which the three coreless coils to which the shifted u-phase, v-phase and w-phase currents are applied are arranged in parallel in the moving direction of the magnet structure are magnetically connected to each other. In a three-phase AC movable magnet type linear motor arranged so as to face each other through a gap, the coil holding wall to which the coil unit is attached is made of a nonmagnetic material, and the magnet structure is guided and moved. A movable base body made of a non-magnetic material having a mounting surface parallel to the direction, and N arranged so as to face the stator side, being arranged at intervals in the moving direction of the movable base body. And a plurality of main magnets which are alternately magnetized and spaced apart from each other, and a plurality of auxiliary magnets arranged so as to sandwich the main magnets in the moving direction, respectively. The magnet is arranged such that the magnetic pole on the side facing each main magnet is the same as the magnetic pole on the side facing the coreless coil on the stator side.

  The structural feature of the invention according to claim 2 is that, in claim 1, the full width of each of the coreless coils parallel to the moving direction of the magnet structure corresponds to 240 degrees of the applied current phase. The width of the coil unit corresponds to 720 degrees of an applied current phase, and corresponds to 60 degrees of a current phase to which a winding width parallel to the moving direction of each winding portion of each coreless coil is applied, An interval between windings paired in the moving direction of one coreless coil corresponds to 120 degrees of an applied current phase, and a pair of adjacent main magnets in the magnet structure and an auxiliary magnet therebetween The total width in the moving direction corresponds to 240 degrees of the applied current phase.

  The structural feature of the invention according to claim 3 is that, in claim 1, the coil unit is configured such that each of the coreless coils is applied in the order in which the u-phase, w-phase, and v-phase currents are applied, and the u-phase is applied. The coreless coils are arranged so as to be close to each other by disposing one winding portion of the coil to which the other two phases are applied between the windings paired in the moving direction of the coreless coil. The full width of the coil unit corresponds to 360 degrees of the applied current phase.

  According to the first aspect of the present invention, the direction of the magnetic lines of force of the main magnet can be deflected by the auxiliary magnet, so that leakage of the magnetic lines of force can be prevented and the magnet yoke can be omitted. Therefore, by using a low-density nonmagnetic material instead of the magnet yoke, it is possible to increase the response by reducing the weight of the mover.

  According to the second aspect of the present invention, the coreless coil and the main magnet are moved by moving the mover by 120 degrees or 240 degrees for each current phase peak using a three-phase AC power supply whose phase is shifted by 120 degrees. If the direction of movement is the same, there is no need to change the direction of the current. Therefore, the mover can be moved very smoothly by simple current control.

  According to the invention of claim 3, by arranging the coreless coils so as to be close to each other, the entire width of one coil unit can correspond to 360 degrees of the applied current phase, simply in series. Compared to the case where each coreless coil is arranged, two coil units can be arranged in the same space where the coil unit is installed, so by applying the same current to each, the coil unit using the same space is doubled. Thrust can be obtained. Further, the coil unit portion is space-saving, and the entire linear motor can be made compact.

  A first embodiment of a three-phase AC moving magnet type linear motor according to the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual view from the front showing the structure of the three-phase AC movable magnet type linear motor 2 in cross section, and FIG. 2 is a conceptual view from the side shown in the same cross section. The linear motor 2 includes a primary side element on the stator side and a secondary side element on the mover side that can move relative to the primary side element.

  As shown in FIG. 1, the three-phase AC movable magnet type linear motor 2 includes a magnet holding base 6 as a hollow box-shaped movable base body made of, for example, a non-magnetic aluminum alloy, and a magnet holding base. 6 is provided with a movable element 14 comprising a plurality of magnet constituents 8 made of permanent magnets attached to both side surfaces of the magnet 6, and support parts (not shown) respectively attached to both end openings of the magnet holding base 6. The secondary element of the linear motor 2 is constituted by the child 14. For example, a tool holding device (not shown) for holding a cutting tool or the like for cutting a workpiece with high accuracy is attached to an end (tip side end) of one support portion (not shown) of the movable element 14. ing.

  In addition, the three-phase AC movable magnet type linear motor 2 includes a support base (not shown) made of a non-magnetic material fixedly installed on which the movable element 14 moves relative to the linear motor 2. The support base includes a fluid bearing (not shown) that supports the support portions (not shown) at both ends of the mover 14 so as to be slidable only in the X-axis direction (moving direction of the mover 14) by the static pressure of oil. A coil holding wall 24 made of, for example, an aluminum alloy, which is a non-magnetic material, is provided so as to surround the magnet holding base 6 and the side surface (mounting surface) 7. The coil holding wall 24 includes a flat wall portion 20 that faces both side surfaces of the mover 14 and a bottom wall portion 22 that connects the flat wall portion 20. As shown in FIG. 2, each phase coil 30, 32, 34 as a coreless coil is provided on the inner wall surface of the flat wall portion 20 of the coil holding wall 24 so as to be opposed to each magnet component 8. Yes. Each phase coil 30, 32, 34 is formed by being wound in a substantially rectangular shape by a rectangular wire around a wound portion 29 made of, for example, glass epoxy. Moreover, the coil holding | maintenance part 27 which contacts the to-be-wrapped part 29 is made from resin, The eddy current generated when a magnetic field crosses a metal is suppressed. The bottom wall portion 22 is provided with a linear position sensor (not shown) so as to detect a relative movement position of the mover 14 relative to the support base. In addition, a very thin insulating plate (not shown) made of, for example, glass epoxy is inserted between each phase coil 30, 32, 34 and the coil holding wall 24 for electrical insulation. As shown in FIG. 4, the coil holding wall 24 includes a cooling pipe 28, and a coolant (for example, cooling water) is circulated in the cooling pipe 28 by a pump (not shown). Each of the coils 30, 32, and 34 has a current applied to each phase of the u-phase, v-phase, and w-phase, whose current phases are shifted by 120 degrees, respectively. A coil unit 36 is configured by arranging the coil 30, the W-phase coil 32, and the V-phase coil 34 in this order (see FIG. 2).

  The total width Wc in the moving direction of each phase coil 30, 32, 34 shown in FIG. 3 corresponds to about 240 degrees of the current phase shown in FIG. 5, and the winding width of the coil being wound in the moving direction Wm is configured to correspond to 60 degrees of the same current phase. This is due to the following reason. Since the current applied to each phase coil 30, 32, 34 is a three-phase alternating current as shown in FIG. 5, for example, the U-phase coil 30 opposed to a certain magnetic pole is moved to the same coil by three movements. Faces the next magnetic pole. That is, every time the current phase changes 360 degrees, the magnetic field of the magnet also moves 360 degrees. The coil winding width Wm is not limited to the one corresponding to 60 degrees, and may be, for example, 70 degrees, 55 degrees, or the like.

  In addition, the primary side element (stator side) of the linear motor 2 is comprised by the coil holding wall 24 to which each phase coil 30,32,34 was attached. Each phase coil 30, 32, 34 is connected to a current control circuit (not shown) connected to each phase of a three-phase AC power supply (not shown), and the current control circuit is a signal from the linear type position sensor. However, the current value from the AC power supply is controlled by a signal from a control device (CPU) (not shown). As the current control circuit, for example, a commercially available amplifier composed of a switching element such as an IGBT (Inerted Gate Bipolar Transistor) may be used.

  Further, in the embodiment, the polygonal cylindrical magnet holding base 6 is formed into a quadrangular cylindrical shape by four plane walls, and as shown in FIGS. 1 and 2, both side surfaces (mounting surfaces) 7 of the vertical wall 38. The first and second magnet structures 8a and 8b are respectively attached to the. The magnet structures 8a and 8b are composed of first and second permanent magnets 40 and 42 as main magnets and an auxiliary magnet 44 as an auxiliary magnet. The first and second permanent magnets 40 and 42 are formed in a rectangular parallelepiped shape, for example, from rare earths, and these permanent magnets 40 and 42 are magnetized in the direction of magnetization (the direction of the line connecting the centers of the corresponding opposite poles in a single magnet). ) Are arranged in a direction perpendicular to the X-axis direction. As shown in FIG. 3, the magnet holding base 6 is alternately magnetized with N and S poles so as to face the phase coils 30, 32 and 34 on the stator side. The permanent magnet 40 is arranged so that the outside is the N pole, the inside is the S pole, the outside of the second permanent magnet is the S pole, and the inside is the N pole. An auxiliary magnet 44 is disposed between the first permanent magnet 40 and the second permanent magnet 42 with the magnetization direction parallel to the X-axis direction (in other words, the auxiliary magnet 44 is The first permanent magnet 40 and the second permanent magnet 42 are arranged so as to sandwich the first permanent magnet 40 and the second permanent magnet 42). Each auxiliary magnet 44 has a magnetic pole on the side facing the first permanent magnet that has the same polarity as the N pole, which is the magnetic pole on the side where the first permanent magnet 40 faces each phase coil 30, 32, 34. The magnetic pole on the side facing the second permanent magnet is arranged so that the second permanent magnet 42 is the same pole as the S pole which is the magnetic pole on the side facing each phase coil 30, 32, 34. By arranging the auxiliary magnet 44 in this way, leakage of magnetic flux to the magnet holding base side is prevented, and the number of magnetic fluxes traversing each phase coil 30, 32, 34 is increased so as to exert a large thrust. It has become. Furthermore, the yoke 14 is realized to reduce the weight of the movable element 14 and the stator side is also yokeless, so that the entire weight is reduced at the same time. In addition, a of FIG. 3 has shown the magnetic field distribution of the magnet.

  Next, the operation of the three-phase AC movable magnet type linear motor 2 configured as described above will be described below. In the linear motor 2, a three-phase alternating current having a phase shift of 120 degrees as shown in FIG. 5 is applied. First, by performing phase matching by direct current excitation, the phase coils 30, 32, and 34 through which currents of u-phase, v-phase, and w-phase flow are converted into the first permanent magnet 40 and the first magnet of the mover 14 shown in FIG. The current is applied at the timing of << 1 >> shown in FIG. The current phase at this time is 90 degrees. A current flows clockwise through the U-phase coil 30 as viewed from the magnet holding base 6, and the first permanent magnet 40 and the second permanent magnet 42 facing the U-phase coil 30 are prevented from leaking magnetic flux by the auxiliary magnet 44. And the number of magnetic fluxes is increased. Then, between the first permanent magnet 40 and the second permanent magnet 42 facing each other and the U-phase coil 30, the U-phase coil 30 is moved to the distal end side (left side in FIG. 6) in accordance with Fleming's left-hand rule. A force is generated, and a thrust force to the right side in FIG. 6 is applied to the magnet structure 8a as a reaction to move the mover 14 to the right side. This movement position is detected by a linear position sensor (not shown), a signal of the detection position is sent to the CPU, and the amount of energization is determined by the IGBT or the like to control the movement amount of the mover 14.

  Next, as shown in FIG. 7, the mover 14 moves to a position corresponding to the current phase of 210 degrees by the thrust, and the V-phase coil 32 is moved to the first permanent magnet 40 and the second permanent magnet 42. Oppositely, a current is applied at the timing of << 3 >> shown in FIG. In the same manner as described above, according to Fleming's left-hand rule, a force to the tip side (left side in FIG. 7) is generated in the V-phase coil 32, and a thrust to the right side in FIG.

  Next, as shown in FIG. 8, the thruster moves the mover 14 to a position corresponding to the current phase of 330 degrees, and the W-phase coil 34 is moved to the first permanent magnet 40 and the second permanent magnet 42. Oppositely, a current is applied at the timing of << 5 >> shown in FIG. In the same manner as described above, according to Fleming's left-hand rule, a force is generated in the W-phase coil 34 toward the tip (left side in FIG. 8), and a thrust force on the right side in FIG.

  Next, as shown in FIG. 9, the thruster moves the mover 14 to a position corresponding to a current phase of 450 degrees, and the U-phase coil 30 moves to the second permanent magnet 42 and the first permanent magnet 40. Opposing each other, current is applied at the timing of << 7 >> shown in FIG. A current flows clockwise through the U-phase coil 30 as viewed from the magnet holding base 6, and a force toward the tip side (left side in FIG. 9) is generated in the U-phase coil 30 in accordance with Fleming's left-hand rule as described above. As a reaction, a thrust to the right side in FIG. 9 is applied to the magnet structure 8a.

  In addition, although it demonstrated that the needle | mover 14 stopped in the phase of << 1 >> << 3 >> << 5 >> << 7 >>, it cannot be overemphasized that these are continuous operation | movement.

  According to the three-phase AC movable magnet type linear motor 2 configured as described above, the direction of the magnetic lines of force of the first permanent magnet 40 and the second permanent magnet 42 can be deflected by the auxiliary magnet 44. Therefore, the magnet yoke can be omitted. Therefore, by using a low-density nonmagnetic material instead of the magnet yoke, it is possible to increase the response of the linear motor by reducing the weight of the mover 14.

  Further, using a three-phase AC power supply whose phase is shifted by 120 degrees, the mover 14 is moved by 120 degrees or 240 degrees for each current phase peak, and the first phase coils 30, 32, 34 are moved to the first phase coils 30, 32, 34. Since the permanent magnet 40 and the second permanent magnet 42 are opposed to each other and the same moving direction is used, there is no need to change the direction of the current, so that the mover 14 can be moved very smoothly by simple current control.

  In addition, although it has been described that a current having an amplitude at the same position as the movement start time flows, it is a matter of course that the current amplitude value is controlled so that the current value with respect to time becomes a sine curve.

  Further, when the linear motor 2 is driven by energizing each phase coil 30, 32, 34, heat is generated by the drive current, but the cooling pipe 28 provided on the coil holding wall 24 is supplied with a refrigerant ( Cold water) is sent, and heat generation can be efficiently removed.

  Next, a second embodiment of the three-phase AC movable magnet type linear motor according to the present invention will be described with reference to the drawings. In the three-phase AC movable magnet type linear motor 52 of the present embodiment, the u-phase, v-phase, and w-phase coils 60, 62, and 64 are overlapped as shown in FIG. This is different from the first embodiment. For example, as shown in FIG. 11, the winding shape of the coil to be superimposed is such that both ends in the longitudinal direction of the U-phase coil 60 are curved in a mountain shape, and both ends in the longitudinal direction are curved in a valley shape in the V-phase coil 62. The W-phase coil 64 is formed so as to be longer than the two phase coils 60 and 62 in the longitudinal direction so that the ends in the longitudinal direction do not contact the ends of the two phase coils 60 and 62. Yes. In this case, since the W-phase coil 64 is arranged at a position shifted by 180 degrees in the current phase, a current in the opposite direction is flowed to W. Further, in the same space as the full width Wc of the coil unit in the X-axis direction of the first embodiment (corresponding to 720 degrees of the applied current phase), two of the first coil unit 54 and the second coil unit 56 are used. Are provided in series. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  Next, the operation of the three-phase AC movable magnet type linear motor 52 configured as described above will be described below. In this linear motor 52, as in the first embodiment, a three-phase alternating current having a phase shift of 120 degrees shown in FIG. 5 is applied. However, in order to simplify the description, it is assumed that currents flowing from different power sources in the same phase are applied to the first coil unit 54 and the second coil unit 56, respectively. First, by performing phase matching, the phase coils 60, 62, and 64 in which the u-phase, v-phase, and w-phase currents flow are changed into the first permanent magnet 40 and the second permanent magnet of the mover 14 shown in FIG. It is made to oppose the magnet 42. In FIG. 12, the current is applied at the timing of << 1 >> shown in FIG. The current phase at this time is 90 degrees. In the first and second coil units 54 and 56, a current flows clockwise through the U-phase coil 60 as viewed from the magnet holding base 6, and the first permanent magnet 40 and the second permanent magnet facing the U-phase coil 60. The magnet 42 is prevented from leaking magnetic flux by the auxiliary magnet 44 and the number of magnetic fluxes is increased. Then, between the first permanent magnet 40 and the second permanent magnet 42 facing each other and the U-phase coil 30, the U-phase coil 60 is moved to the distal end side (left side in FIG. 12) in accordance with Fleming's left-hand rule. A force is generated, and a thrust to the right side in FIG. 12 is applied to the magnet structure 8a as a reaction.

  Next, as shown in FIG. 13, the thruster moves the mover 14 to a position corresponding to 210 degrees of the current phase, and the V-phase coil 62 is moved to the first permanent magnet 40 and the second permanent magnet 42. Oppositely, a current is applied at the timing of << 3 >> shown in FIG. In the same way as described above, in the first and second coil units 54 and 56, a force toward the tip side (left side in FIG. 13) is generated in the V-phase coil 62 in accordance with Fleming's left-hand rule, and the magnet structure 8a As a reaction, thrust to the right in FIG. 13 is applied.

  Next, as shown in FIG. 14, the mover 14 further moves to a position corresponding to 330 degrees of the current phase by the thrust, and the W-phase coil 64 is moved in the first and second coil units 54 and 56. A current is applied to the second permanent magnet 42 and the first permanent magnet 40 at the timing of << 5 >> shown in FIG. In this case, a current flows counterclockwise as viewed from the magnet holding base 6 in the W-phase coil 64, and a force toward the distal end side (left side in FIG. 14) is applied to the W-phase coil 64 in accordance with Fleming's left-hand rule. As a result, a thrust to the right in FIG. 14 is applied to the magnet structure 8a as a reaction.

  Next, as shown in FIG. 15, the mover 14 further moves to a position corresponding to 450 degrees of the current phase by the thrust, and the U-phase coil 60 is moved in the first and second coil units 54 and 56. The first permanent magnet 40 and the second permanent magnet 42 are opposed to each other, and a current is applied at a timing at << 7 >> shown in FIG. A current flows clockwise through the U-phase coil 60 as viewed from the magnet holding base 6, and a force toward the distal end side (left side in FIG. 15) is generated in the U-phase coil 60 in accordance with Fleming's left-hand rule as described above. As a reaction, a thrust to the right side in FIG. 15 is applied to the magnet structure 8a.

  According to the three-phase AC moving magnet type linear motor 52, the entire width of one coil unit 54 can correspond to 360 degrees of the applied current phase, and the coil unit 36 of the first embodiment is attached. Since two coil units 54 and 56 can be arranged in the same space, twice the thrust can be obtained by applying the same current to each. Further, since space can be saved at the same time, the entire apparatus can be made compact.

  In the above embodiment, the operation has been described for the case where the mover 14 moves only in one direction. However, the operation is not limited to this, and the mover 14 is changed by changing the direction of current and the amount of current using the IGBT, for example. Can be moved in the opposite direction or the moving speed of the mover can be changed easily.

Sectional drawing from the front of the three-phase alternating current type movable magnet type linear motor which concerns on this invention. The top view including a cross section in part. The figure which shows the arrangement | positioning state of the coreless coil and magnet structure in 1st Embodiment. IV-IV sectional drawing. The figure which shows the three-phase alternating current applied to a coreless coil. The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The conceptual diagram of the coil unit in 2nd Embodiment. The figure which shows the general shape of each coreless coil combined with the coil unit. The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator). The figure which shows the relative movement of the magnet structure (mover) with respect to the coil unit (stator).

Explanation of symbols

  2 ... three-phase AC movable magnet type linear motor, 6 ... movable base body (magnet holding base), 8a, 8b ... magnet structure, 14 ... mover, 24 ... stator (coil holding wall), 30 ... coreless coil (U-phase coil), 32 ... Coreless coil (V-phase coil), 34 ... Coreless coil (W-phase coil), 36 ... Coil unit, 40 ... Main magnet (first permanent magnet), 42 ... Main magnet (second) Permanent magnet), 44 ... auxiliary magnet (auxiliary magnet), 52 ... three-phase AC movable magnet type linear motor, 54 ... first coil unit, 56 ... second coil unit, 60 ... coreless coil (U phase coil) 62 ... Coreless coil (V phase coil), 64 ... Coreless coil (W phase coil), Wc ... Full width, Wm ... Winding width.

Claims (3)

A mover side having a magnet structure in which a plurality of magnets are arranged along the moving direction, and three coreless coils to which currents of u phase, v phase, and w phase that are out of phase by 120 degrees are applied are arranged. In the three-phase alternating current movable magnet type linear motor arranged so that the stator coil side, in which the coil units arranged in parallel with the moving direction of the magnet structure are opposed to each other via a magnetic gap,
The coil unit is attached to a coil holding wall made of a nonmagnetic material,
The magnet structure is arranged in a movable base body made of a non-magnetic material, which is guided so as to be movable and formed with a mounting surface parallel to the movement direction, with an interval in the movement direction of the movable base body, and the fixed body A plurality of main magnets which are alternately magnetized with N and S poles so as to be opposed to the child side and are spaced apart from each other, and a plurality of main magnets arranged so as to sandwich each of the main magnets in the moving direction. With an auxiliary magnet,
Each of the auxiliary magnets is arranged such that the magnetic pole on the side facing each main magnet is the same as the magnetic pole on the side facing the coreless coil on the stator side. Phase AC type movable magnet type linear motor. In claim 1, the full width of each coreless coil parallel to the moving direction of the magnet structure corresponds to 240 degrees of the applied current phase,
The width of one coil unit corresponds to 720 degrees of the applied current phase,
Corresponding to 60 degrees of the current phase to which a winding width parallel to the moving direction of each winding part of each coreless coil is applied,
The distance between the windings paired in the moving direction of one coreless coil corresponds to 120 degrees of the applied current phase,
The three-phase alternating current movable magnet type, wherein the total width in the moving direction of the pair of adjacent main magnets and the auxiliary magnets in the magnet structure corresponds to 240 degrees of the applied current phase Linear motor. 2. The coil unit according to claim 1, wherein each of the coreless coils is paired in the order in which the u-phase, w-phase, and v-phase currents are applied, and in the moving direction of the coreless coil to which the u-phase is applied. Arranged to be close to each other by disposing one winding portion of the coil to which the other two phases are applied between the windings, respectively.
A three-phase AC movable magnet type linear motor characterized in that the full width of one coil unit corresponds to 360 degrees of the applied current phase.

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