JP2007209174A - Three-phase linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase linear motor provided with three phases of stator pieces disposed in parallel and having embedded permanent magnets, and a movable element having three phases of movable element pieces coupled to each other. <P>SOLUTION: The three-phase linear motor of the invention is provided with a movable element (30) comprising three phases of the movable element pieces (7, 15, 16) movably disposed in parallel and coupled to each other within the stator body (20) comprising three phases of stators (1, 1A, 1B) disposed in parallel, and enables a three-phase linear drive. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a three-phase linear motor, and in particular, three-phase stator pieces are juxtaposed in a direction perpendicular to the longitudinal direction, and the three-phase mover pieces provided on the three-phase stator pieces are perpendicular to the moving direction. The present invention relates to a novel improvement for enabling a large thrust to be easily taken out by being arranged in parallel to each other and connected in the same phase.

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. A stator having a claw pole type core around which an armature coil is wound, and the stator pieces are U-phase stator pieces and V-phase stator pieces arranged in parallel in a direction perpendicular to the longitudinal direction thereof. And the mover comprises a U-phase mover piece, a V-phase mover piece, and a W-phase mover piece arranged in parallel in a direction orthogonal to the moving direction, The electrical angle phase differences of the mover pieces are connected in a zero state, and the permanent magnet positions of the stator pieces corresponding to the mover pieces have a phase difference of 2π / 3 in electrical angle. The permanent magnet is embedded in each stator piece. That.

Since the three-phase linear motor according to the present invention is configured as described above, the following effects can be obtained.
That is, a three-phase linear motor is constructed by arranging three-phase stators each consisting of a pair of stator pieces and movably disposing a mover in which a three-phase mover piece is connected in the stator. Therefore, it is possible to easily take out the thrust (torque) at any point in the movable range by moving a long distance.
In addition, because it has stator pieces with permanent magnets on both the upper and lower sides of the mover, the mover has an equal magnetic attractive force, so that an excessive load is not applied to the linear guide, etc., and a long life is obtained. be able to.

  In the present invention, three-phase stator pieces are juxtaposed in a direction perpendicular to the longitudinal direction, and three-phase mover pieces provided in the three-phase stator piece are juxtaposed in a direction perpendicular to the moving direction. It is an object of the present invention to provide a three-phase linear motor that is short in the movable direction and can easily extract a large thrust by being connected with each other.

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 long U-phase fixed parts spaced apart from each other by a distance D. Each U-phase stator piece 2, 3 has a configuration in which a permanent magnet 4 is embedded in a yoke of soft magnetic material.

In the U-phase stator 1, a V-phase stator 1 </ b> A and a W-phase stator 1 </ b> B are juxtaposed at a slight interval in a direction perpendicular to the longitudinal direction.
The V-phase stator 1A includes a pair of V-phase stator pieces 8 and 9 that are spaced apart from each other by a distance D. The W-phase stator 1B is spaced apart from each other by a distance D. It is comprised from a pair of W phase stator pieces 10 and 11 provided.

  The U-phase stator 1, V-phase stator 1 A and W-phase stator 1 B constitute a three-phase stator body 20, and a claw pole type movable body 30 is located within the interval D of the stator body 20. However, it is comprised so that it can reciprocate along the moving direction shown by the arrow A along the longitudinal direction of the said stator body 20. FIG.

  As shown in FIG. 2, the movers 30 are connected so as to be in phase with each other in the direction orthogonal to the direction of the arrow A (the movement direction of the mover 30). It comprises a U-phase mover piece 7, a V-phase mover piece 15 and a W-phase mover piece 16 which are provided, and each of the mover pieces 7, 15, 16 is formed in the same manner as the U-phase mover piece 7. Has been.

The U-phase mover piece 7 includes an armature coil 5 and four sets of claw pole portions 6.
The positions of the permanent magnets 4 of the stator pieces 2, 3, 8, 9, 10, 11 corresponding to the mover pieces 7, 15, 16 are electrical angles of ± 2π / 3 (120 °). It arrange | positions so that it may become a phase difference and each permanent magnet 4 is embed | buried in each stator piece 2,3,8,9,10,11. Therefore, the reciprocating linear movement of the mover 30 can be performed by simultaneously exciting the armature coils 5 of the mover pieces 7, 15 and 16.
In addition, the linear guide with respect to the needle | mover 30 or a to-be-driven body is abbreviate | omitting illustration.

  The present invention is not limited to a linear motor but can be applied to a linear actuator or the like.

It is a block diagram which shows the principal part of the 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 of 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 U phase stator 1A V phase stator 1B W phase stator 2, 3 U phase stator piece 4 Permanent magnet 5 Armature coil 6 Claw pole part 7 U phase mover piece 8, 9 V phase stator piece 10, 11 W-phase mover piece 15 V-phase mover piece 16 W-phase mover piece 20 Stator body 30 mover

Claims (2)

A stator composed of a pair of stator pieces arranged at predetermined intervals and having a plurality of permanent magnets (4) spaced apart from each other, and an armature provided movably between the stator pieces. A mover comprising a claw-pole core around which a coil (5) is wound,
The stator pieces are U-phase stator pieces (2, 3), V-phase stator pieces (8, 9), and W-phase stator pieces (10, 11) arranged in a direction perpendicular to the longitudinal direction thereof. The mover is composed of a U-phase mover piece (7), a V-phase mover piece (15), and a W-phase mover piece (16) arranged in parallel in a direction perpendicular to the moving direction. ,
The electrical angle phase difference of each of the mover pieces (7, 15, 16) is connected in a state of zero, and each of the stator pieces (2, 2, 16) corresponding to each of the mover pieces (7, 15, 16) 3. A three-phase linear motor characterized in that the positions of permanent magnets (4) of 3, 8, 9, 10, 11) are arranged so as to have a phase difference of 2π / 3 in electrical angle.   The three-phase linear motor according to claim 1, wherein the permanent magnet (4) is embedded in each stator piece (2, 3, 8, 9, 10, 11).

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