JP2007209175A - Three-phase linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a three-phase linear motor for moving a movable element comprising three phases of movable element pieces to a stator having an embedded permanent magnet in the longitudinal direction of the stator. <P>SOLUTION: The three-phase linear motor includes: the movable element (7) having the U-phase movable element piece (10); the V-phase movable element piece (11); and the W-phase movable element piece (12) disposed in the direction different from the longitudinal direction (A) of the stator (1). Armature coils (5) in the movable element pieces (10-12) are constituted so as to generate a phase difference of 2π/3 at an electric angle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a three-phase linear motor, and in particular, to a stator consisting of a pair of stator pieces, a mover consisting of a three-phase mover piece having armature coils whose phases are shifted from each other by 2π / 3. And a new improvement for three-phase drive.

As this type of linear motor that has been conventionally used, the configuration disclosed in Patent Document 1 can be shown in FIGS.
That is, what is denoted by reference numeral 1 in FIGS. 6 and 7 is a stator composed of a pair of elongated stator pieces 2, 3. Each stator piece 2, 3 is a permanent magnet on a yoke of soft magnetic material. 4, and the stator pieces 2 and 3 are spaced apart from each other by a distance D.

Within the distance D, a claw pole type movable element 7 having an armature coil 5 and a claw pole portion 6 is disposed so as to be reciprocally movable in the direction of arrow A.
The claw pole portion 6 constitutes a claw pole type tooth portion of a claw pole type core, and is formed in a taper type that tapers toward the tip in order to prevent the cogging phenomenon of the linear motor.

  The taper type claw pole portion 6 has a total of four sets in the vertical direction (that is, four sets in the vertical direction as shown in FIG. 6) so that the magnetic poles are opposite to each other, and generates a magnetic flux corresponding to the current phase. Has been.

  In the above-described linear motor, since the mover 7 has the claw pole portion 6, the magnetic path is in the direction perpendicular to the traveling direction in the middle, and the claw pole portions 6 are connected between adjacent claw pole portions 6 on the tip side. Since the magnetic path is formed in the direction of the movement, the magnetic path changes in a direction parallel to the traveling direction.

  That is, the magnetic flux generated by the excitation current is perpendicular to the moving direction at the base side portion interlinked with the armature winding 5, and efficiently interferes with the magnetic flux from the permanent magnet 4 at the tip side portion. The leakage magnetic flux is configured to be in the traveling direction of the mover 7.

JP 2004-140954 A

Since the conventional linear motor is configured as described above, the following problems exist.
That is, since the above-described linear motor has a single mover, it cannot generate a sufficient thrust, and has not been proposed as a three-phase linear motor.

  A three-phase linear motor according to the present invention is provided with a stator composed of a pair of stator pieces having a plurality of permanent magnets spaced apart from each other and movably provided between the stator pieces. And a mover comprising a claw-pole core around which an armature coil is wound, the mover comprising a U-phase mover piece disposed along a direction different from the longitudinal direction of the stator, a V-phase A movable piece and a W-phase movable piece, each armature coil of each movable piece is configured to have a phase difference of 2π / 3 in electrical angle; The stator is embedded in each stator piece, and the width along the short direction perpendicular to the longitudinal direction of the stator is equal to or greater than the width of the mover of the mover. is there.

Since the three-phase linear motor according to the present invention is configured as described above, the following effects can be obtained.
In other words, a three-phase mover having three-phase mover pieces having armature coils whose phases are shifted from each other by 2π / 3 with respect to the stator made of a pair of stator pieces is provided. Since the phase linear motor is configured, it is possible to easily extract a thrust (torque) at any point in the movable range by moving a long distance.
In addition, because it has a pair of stator pieces with magnets embedded on both sides of the mover, the mover will have an equal magnetic attraction force, and the linear guide etc. will not be overloaded and long. Life is reached.

  According to the present invention, a mover made of a three-phase mover piece having armature coils that are shifted from each other by 2π / 3 phase (120 °) is arranged with respect to a stator made of a pair of stator pieces. An object of the present invention is to provide a three-phase linear motor designed to be phase driven.

Hereinafter, preferred embodiments of a three-phase linear motor according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
FIGS. 1 to 5 show a three-phase linear motor according to the present invention. Reference numeral 1 in FIGS. 1 to 3 denotes a pair of first, The stator is composed of second stator pieces 2 and 3, and permanent magnets 4 are embedded in the stator pieces 2 and 3.

Each permanent magnet 4 embedded in each stator piece 2, 3 has a long plate shape and extends along a short direction B perpendicular to the longitudinal direction A of the stator 1.
The length of the stator 1 coincides with a moving direction in which a later-described movable element 7 moves linearly along the longitudinal direction A, and a width W along the short-side direction B has a movable length of the movable element 7 described later. are formed in the same or more and the child width W _K, three phases of U, V, is configured in the width W corresponding to the W-phase armature pieces 10, 11, 12.

  The mover 7 has U, V, and W-phase mover pieces 10, 11, and 12 arranged at predetermined intervals along the direction of the width W, and each mover piece 10, 11, 12. Are configured such that their phases are different from each other by 2π / 3 along the longitudinal direction A.

As shown in FIG. 5, each of the mover pieces 10, 11, 12 is composed of a plurality of claw pole portions 6 and armature coils 5, and a known claw pole type mover 7. Is configured.
The mover pieces 10, 11, 12 are arranged at predetermined intervals along the direction of the width W of the stator 1, and are arranged along a direction different from the longitudinal direction A.

  Therefore, in the above-described configuration, by energizing and energizing each armature coil 5 of each of the mover pieces 10, 11, 12, the mover 7 is moved through the linear guide or the driven body (not shown). It can reciprocate along the longitudinal direction A.

It is a block diagram which shows the principal part of the three-phase linear motor by this invention. It is a block diagram which shows the planar state of FIG. It is a front block diagram which shows the front of FIG. It is an enlarged view which shows the principal part of FIG. It is a perspective view which shows the needle | mover piece of FIG. It is a block diagram of the principal part which shows the conventional linear motor. It is a front block diagram which shows the front of FIG. It is an enlarged view of the principal part of FIG. It is a perspective view which shows the needle | mover of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 1st stator piece 3 2nd stator piece 4 Permanent magnet 5 Armature coil 6 Claw pole part 7 Mover 10 U-phase mover piece 11 V-phase mover piece 12 W-phase mover piece A Longitudinal direction B Short direction W width D interval W _K mover width

Claims (3)

A stator (1) consisting of a pair of stator pieces (2, 3) arranged with a plurality of permanent magnets (4) at a predetermined interval and spaced from each other (D), and each of the stator pieces ( 2 and 3) and a mover (7) comprising a claw pole type core around which an armature coil (5) is wound.
The mover (7) includes a U-phase mover piece (10), a V-phase mover piece (11) and a W-phase arranged along a direction different from the longitudinal direction (A) of the stator (1). The armature coil (5) of each of the mover pieces (10 to 12) is configured to have a phase difference of 2π / 3 in electrical angle. Phase linear motor.   The three-phase linear motor according to claim 1, wherein the permanent magnet (4) is embedded in each stator piece (2, 3). The width (W) along the short direction (B) perpendicular to the longitudinal direction (A) of the stator (1) is equal to or greater than the width of the mover (W _K ) of the mover (7). 3. The three-phase linear motor according to claim 1, wherein the three-phase linear motor is configured.

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