JPS63290155A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To reduce abrasion in contact parts by providing permanent magnets in opposition to each other so that both a stator and mover repulse each other. CONSTITUTION:On the underside of a mover 21, projecting pole teeth 21a are formed at equal pitches, and at both ends of said underside, V-shaped V-grooves 21b and flat-bottom grooves 21c are formed in the direction of progress A. The top surfaces of stators 22-25 have pole teeth 22a-25a of the same type as pole teeth 21a of the mover 21 and V-grooves 22b-23b are formed thereon. Further, said stators 22-25 are equipped with a positioning plate 26 for their pole teeth 22a-25a, a permanent magnet 27, a magnetic path plate 28, exciting coils 31-32, coil plates 29-30, and balls 35. Also, permanent magnets 37-38 are provided and a repulsive force between said both magnets is maintained constant even if said mover 21 moves. Thus, a repulsive force is generated between the stators 22-25 and mover 21, and a frictional resistance of the mover 21 due to the rolling friction of the balls 35 and rollers is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a linear pulse motor, and particularly to a linear motor that reduces movement resistance of a movable element.

[Conventional technology]

What is shown in FIGS. 3 and 4 is, for example,
FIG. 3 is an exploded view of the conventional linear pulse motor disclosed in Japanese Patent No. 113652, and FIG. 4 is a side view of the motor after assembly.

In the figure, reference numeral (1) denotes a movable element, which has convex magnetic pole teeth (1a) formed at equal pitches on its lower surface.

(2), (3)1+1(4), and (5) are stators, which are arranged at intervals to be described later. Also, the stators (2), (3), (4).

(5) is the magnetic pole tooth (1a) of the movable element (1) on the upper surface of the inner end.
) with the same shape and pitch as magnetic pole teeth (2aL (i3
a).

(4a) and (5a). (6) is the stator (2) above.

(3), (4), (5) for each magnetic pole tooth (2a),
Positioning plates (3a), (4a), and (5a) are attached at intervals of 1/4 of the pitch, and (7) is the movable element (1) and stator (2), (3), ), (8) is a permanent magnet for generating magnetic flux between the above permanent magnet (7).
), a magnetic path plate for forming a magnetic path provided immediately below (1
).

(2) is a coil that excites the stator (21J31.(4)ts), and (9) and (10) are the above coils (21J31.(4)ts), respectively.
11) It is a coil plate on which 1 (12) is wound.

(1:3), (14) are guides for guiding the mover (1) in the traveling direction, (18) is a ball, and the mover (1)
The guides (13) and (14) are in contact with each other via the ball (18). (19) is the magnetic pole tooth (
1a) and stator (2), (3) J4), (5) side magnetic pole @ (2aL (3a), (4a).

(5a) to form a constant gap between the mover (1) and the stators (2), (3), (4), (
5) is opposed to each other via the above-mentioned trough (19).

(16) and (17) are cages that hold the balls (18) and (19), and (15) is the moving direction (A) of the mover (1).
) is a spring that applies preload in a direction perpendicular to

(20) is a stator C2 on the primary side that generates magnetic flux.

+3+, +41, +51, positioning plate (6),
Permanent magnet (7), magnetic path plate (8), coil plate (9),
These are screws for fixing 11G and guides (13) and (14).

Next, this conventional &O operation will be explained.

The magnetic pole teeth (2a) of the stator (2) are positioned with a 1/2 pitch shift from the magnetic pole teeth (1a) of the opposing mover (1), and the magnetic pole teeth (3a) of the stator (3) are positioned as magnetic poles. @(2a)
The magnetic pole teeth (4a) and (5) of the stators (4) and (5)
Similarly to the above, a) is also positioned with a 1/2 pitch deviation from each other. And the magnetic pole tooth (2a) + (3a) l with respect to the magnetic pole tooth (1a) of the opposing mover (1)
(4a) l (5a) are each 1/4 of the tooth pitch
They are positioned with a difference between each other.

The mover (1) is attracted by the magnetic flux generated by the permanent magnet (7) to the magnetic pole teeth (2aL (3a), (4aL (5a)), and is moved between the magnetic pole teeth (1a) and the magnetic pole by the rollers (19). It stands still with a constant gap maintained between the teeth (2aL (3a) and (4aL (5a)).

Further, the movable element (1) is brought into contact with the guides (13) and (14) via a ball (18) with a preload applied thereto by a spring (15).

When current is applied to the coil (11) in this state, the coil plate (
9) is excited, and at the same time, the stator (4) and the stator (5) are also excited. At this time, one of the stators +41 and (6+) is excited to the N pole by the permanent magnet (7), and the N pole is strengthened, and the other one is weakened.The magnetic pole teeth (1a) are formed at equal pitches. A movable element (1
) moves slowly from the rest position toward the strengthened north pole, and the magnetic pole tooth (1a) of the mover (1) moves toward the strengthened north pole.
, stops stably at a position facing the +51 magnetic pole tooth (4a) or (5a).

Next, the current is stopped flowing through the coil (11), and the coil (12) has an S pole on the side of the magnetic pole tooth having a difference of 1/2 of the pitch of m from the magnetic pole tooth whose N pole has been strengthened. When the w current is applied so as to strengthen the S pole, the magnetic pole tooth (1a) stably stands still at a position facing the stator side magnetic pole tooth whose S pole is strengthened. That is, the movable element (1) moves by IA of the tooth pitch. This is generally called one-phase excitation.

By performing this l-phase excitation, the movable element (1) can be moved in the traveling direction.

Here, as a condition for the mover (1) to move, the ball (18
) and rollers (19), the propulsive force of the mover (1) due to the force of attraction between the magnetic pole teeth must be greater than the resistance due to rolling friction of the rollers (19).

[Problem that the invention seeks to solve]

Since the conventional linear pulse motor is configured as described above, when the mover (1) moves, the permanent magnet (
7), the mover (1) becomes the stator +21, +31
, +4+.

(5) When the mover (1) tries to move by being pulled toward the
5), and the rollers (19) are rolling, making it difficult for the mover (1) to move. The same applies to the ball (18). Therefore, the resistance due to the rolling friction of the ball (18) and rollers (19) becomes large, which obstructs the movement of the mover (1) and also prevents the ball (18) and the rollers from moving. (19) There is a problem in that the rolling contact portion wears out due to rolling.

This invention was made to solve the above-mentioned problems, and it reduces the force applied to the balls and rollers to reduce the resistance due to rolling friction of the balls and rollers, making it easier to move the mover. The present invention also aims to provide a linear pulse motor that reduces wear of balls, rollers, and their rolling contact parts.

[Means for solving problems]

In the linear pulse motor according to the present invention, permanent magnets are respectively attached to the movable element and the stator so as to face each other so that the stator and the movable element repel each other.

[For production]

In the linear pulse motor according to the present invention, permanent magnets that repel each other are attached to the stator and the mover, respectively, so a repulsive force is generated between the stator and the mover, thus supporting the mover. As a result, the frictional resistance of the mover due to the rolling friction of the balls and rollers becomes smaller, making it easier to move the mover and making it easier for the balls and rollers to move. Wear of the transfer contact portion that comes into contact with transfer can also be suppressed.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment thereof.

FIG. 1 is a partially exploded view, and FIG. 2 is a side view after assembly.

In the figure, reference numeral (21) denotes a movable element, which has convex magnetic pole teeth (21a) formed at equal pitches on its lower surface, and V-shaped grooves (21b) and flat-bottomed grooves at both ends of its lower surface. A flat bottom groove (21c) is formed in the traveling direction A.

(z2), (23), (24) l (25) is a stator, and on its upper surface are the magnetic pole teeth (21a) of the mover (21).
Magnetic pole teeth (22
a).

(23a), (24a), and (25a), respectively. Further, the stators (22) and (23) are formed with V-shaped V grooves (22b) and (23b) facing each other and V grooves (21b) and K (21b), respectively. (26) is the stator (22), (23)
).

(24), (25) as its magnetic pole teeth (22a), (23a)
), (24a).

(25a) is a positioning plate for installing by shifting 1/4 of the pitch, (27) is a movable element (21) and a stator (
22), (23), (24), and (25), a permanent magnet for generating magnetic flux and drawing them together; (28) is a magnetic path plate for forming a magnetic path of the permanent magnet (27); (31)
, (32) are stators (24), (25) and stator (2).
2>, a coil (29”l) that excites (23), respectively.
, (30) are the above coils (31) and (32), respectively.
It is a coil plate that is wrapped around.

In addition, the stator (24) (25) has a flat portion facing the flat bottom groove (21c) or a flat bottom groove (24b) (25b).
is provided.

Next, (35) is a ball, the mover (21) and the stator (22)
), (23) with V grooves (21b) (22b) (23b
) are interposed between and in contact with each other. Therefore, the mover (21)
The movement of the ball (35) is as follows:
3b), it does not deviate in any direction other than the traveling direction A. Further, (36) is a roller, which is connected to the flat bottom groove (21c) of the mover (21) and the stator (24) (25).
It is interposed between and in contact with the flat part or flat bottom groove (24b) (+5b). That is, the ball (35) and the roller (3
6) to the mover (21) and stator (22) (23) (24).
) (25), and the movable element (21) and the stator (22) (23) (24) (25) are in contact with each other, so that the magnetic pole tooth (21a) and the magnetic pole tooth ( 22a), (
23a).

The gap between (24a) and (25a) is kept constant.

In addition, (33) and (34) are balls (35)) and rollers (
36). And the above retainer (
3:l, (34>) is 172 times the amount of movement of the movable element (1) because the ball (35) (36) rolls and moves in the moving direction of the movable element (21). Make a move.

Also, (37a”l (3)b) and (38a) (38
b) is a magnet that is provided facing each other, and the mover (
21) and stator (22), (23) and stator (24)
.

(25) respectively the magnets (37a) (37b) (
Shield plates (39a), (39b), (40a), and (40b) for shielding the magnetism of 38a) (38b"l) are provided on the opposite surface and attached.

Next, the operation of this embodiment will be explained.

Due to the resultant force of the electromagnetic force generated by passing current through the coils (31) and (32) and the magnetic force of the permanent magnet (27), the magnetic pole teeth (21
a) and magnetic pole teeth (22a) (23a) (24a) (25a
) A movable element (21) that moves due to the tensile force acting between the
is movable only in the traveling direction A because the ball (35) rolls in the V-grooves (21b) (22b) (23b) of the mover (21) and the stator (22) (23). It is. The magnetic pole teeth (21a) that maintain a constant gap at this time
and magnetic pole teeth (22a”) (23a) (24a) (2
The tensile force acting between the ball (35) and (36)
), the mover (21) is the stator (22) (2F) (2
4) It is in a state of being pressed between (25). This tensile force is applied to the magnet (37a) and (37b).
) and between (38a) and (38b), K, the mover (21) and the stator (22) (23) (24) (25) The force that presses down the ball (35) and roller (36) rolling between them is reduced.

That is, the rolling friction resistance of the ball (35) and roller (36) is reduced.

Note that the movable element (21) uses the holding force of the permanent magnet (27) as the permanent magnet (37a) (37b) (38a) (38b).
), the coils (31), (3
2) It can be easily and lightly moved by the electromagnetic force generated by energizing K.

Also, between magnets (37a) (37b) and (38a) (3
8b) acts so as to be kept constant even if the mover (21) moves.

In the above embodiment, a V groove (21b) and a flat bottom groove (21c) serving as guides are provided only at both ends of the lower surface of the movable element (21), but in addition to these, the movable element (21
) may be provided with a guide that applies preload via a ball to the side surface of the ball.

Further, a V-shaped groove may be provided in the guide portion on the side surface.

〔Effect of the invention〕

As described above, according to the present invention, the permanent magnets are mounted facing each other so that the stator and the mover repel each other, and the stator and the mover repel each other. Since the structure is configured to reduce the movement resistance of the movable element to the stator, the force acting on the stator of the movable element is reduced, and the movement resistance is reduced.Therefore, the movement of the movable element is facilitated, and the relationship between the movable element and the stator is reduced. This has the effect of reducing wear on the connecting parts of the linear pulse motor.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded view showing a linear pulse motor according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1 after assembly,
FIG. 3 is an exploded view of a conventional linear pulse motor, and FIG. 4 is a side view of FIG. 3. (21) -- Mover, (213) II @ magnetic pole ffl,
(21b) (22b) (23t))”
21c) @ Clapbasal groove, (22) (23) (24) (2
5) Stator, (22a) (23a) (24a) (2
5a) "" Magnetic pole teeth, (24b) (25b) - one plane part (flat bottom groove), (26)... positioning plate, (27) Φ.
Permanent magnet, (35)...Ball, (36)...Roller, (37
a) (37b) (38a) (38b) -- Permanent magnet, (
39a) (39b) (40a) (40b) e. Shield plate. In each figure, the same reference numerals indicate the same or corresponding parts. Procedural amendment

Claims (4)

[Claims] (1) Consisting of a stator that has a plurality of magnetic pole teeth on one surface, and a movable element that faces the stator with a certain gap and has magnetic pole teeth on the opposing surface. The stator has permanent magnets, and the magnetic pole teeth of the stator are shifted from each other by a plurality of pitches, and by alternately exciting the plurality of divided magnetic pole teeth of the stator, the movable element can be moved in one direction. In a linear pulse motor that moves the stator and mover together, in addition to the permanent magnet for drawing the stator and mover together, the stator and mover are each provided with magnets so that the stator and mover repel each other. A linear pulse motor characterized in that permanent magnets are mounted facing each other so as to reduce movement resistance of a movable element with respect to a stator. (2) The linear pulse motor according to claim 1, wherein the plurality of divisions of the magnetic pole teeth of the stator are four divisions, and the displacement of each magnetic pole tooth is 1/4 pitch. (3) The movement resistance of the mover with respect to the stator is caused by the V-groove and flat-bottomed groove formed on the mover and stator, respectively, and the rolling ball between the V-groove formed on the mover and stator. The linear pulse motor according to claim 1 or 2, wherein the movement resistance is caused by rolling friction between the movable element and the rollers that roll between flat bottom grooves formed in the movable element and the stator. (4) The permanent magnets attached to the mover and the stator so as to face each other so as to repel each other are provided with a shield plate on the opposite side of the opposing surfaces. 3. The linear pulse motor according to any one of items 3 to 3.