JPS63206154A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To facilitate the extension of stepping length for building up an incremental force or maintaining a high accuracy by unitizing yokes to be attached to a stator and cancelling a plurality of yoke units. CONSTITUTION:A positive current is supplied to the coils 5 of yoke units 71, 72 and the coils 6 of yoke units 73, 74. Then, the poles of the units 71, 72 and the poles of the units 73, 74 generate a strong magnetic attraction force between the opposed poles of a movable element. The poles of the units 71, 72 and the poles of the units 73, 74 generate weak magnetic attraction force with the respectively opposed poles 41 of movable yokes 38, and the movable element stops in the state that the magnetic attraction forces become balanced.

Description

[Detailed Description of the Invention] [Summary] In a linear pulse smoke in which a mover moves using magnetic force, 1. A second yoke, a permanent magnet, and a first yoke. By configuring multiple yoke units equipped with a second excitation coil mounted on the stator, we have realized a series of linear pulse smokes with different moving lengths and stepping forces, resulting in higher performance and lower cost. This is what we were able to achieve.

[Industrial application field]

The present invention provides a linear pulse motor in which a movable element moves in steps according to a pulse signal, particularly a linear pulse motor with different specifications due to the moving length of the movable element being different or a relatively heavy object being mounted on the movable element, etc. Regarding the configuration of series.

[Conventional technology]

FIG. 6 is a perspective view showing the external appearance of a conventional linear pulse motor, FIG. They are a schematic perspective view (A) of the yoke unit shown in the figure and a perspective view (0) of its yoke constituent members.

In FIG. 6, in the Sawyer type linear pulse smoke 11, a movable element 13 moves step by step on a stator 12 in the direction of the arrow.

In FIG. 6 and FIG. 7 (A), the movable element 13 has a plurality of elongated holes formed in the soft magnetic material plate on the lower surface of the soft magnetic material substrate 15 in which a pair of grooves 14 are formed. A movable yoke 17 having two rows of yoke 16 is mounted.

In FIGS. 6 and 7 (0), the stator 12 has a yoke unit 20 attached to the center of the upper surface of the substrate 19, which has a pair of V grooves 18 opposite to the V grooves 14 of the mover 13. ,
A rotatable steel ball 22 held by a retainer 21 is mounted in the V-groove 18.

In FIG. 7(B) and FIG. 8(A), the yoke unit 20 includes a pair of yokes 23.2 made of soft magnetic material.
4, an excitation coil 25.26 wound around the middle part of the yokes 23 and 24, and a pair of permanent magnets 27 and 28 bonded between the parallel yokes 23 and 24, and a plurality of pole teeth 23.
The yokes 23 and 24 in which a or 24a are aligned are made by stacking structural members (yoke plates) 29 formed in a comb-like shape by press working from plate materials in the thickness direction, as shown in FIG. 8(0). .

In the linear pulse smoke 11 configured in this manner, a predetermined pulse current is passed through the coils 25 and 26, and the movable element 13 moves step by step.

[Problem that the invention seeks to solve]

In a linear pulse motor, increasing the stepping force is achieved by increasing the number of magnetic poles and increasing the magnetic pole area.High precision, which makes the stepping amount of one step finer, is achieved by making the magnetic tooth pitch finer. The moving length of the mover is determined by the length of the yoke mounted on the stator.

Therefore, when trying to increase the stepping force or lengthen the moving length of the mover in a linear pulse motor that requires a fine pitch and high accuracy, it is necessary to use a long stator with fine pinch pole teeth. The accumulation of pitch errors in the pole teeth makes it difficult to manufacture highly accurate yoke components, and when designing a linear pulse motor whose movable element has various travel lengths depending on the application, it is necessary to There was a problem in that designing and manufacturing a yoke based on the above was unproductive.

[Means for solving problems]

FIG. 1 is a side view showing an example of the basic configuration of the present invention in a Sawyer type linear pulse motor.

In FIG. 1, the linear pulse smoker of the present invention, in which the movable element moves in the direction in which the yoke unit of the stator is disposed, has a movable element 9 formed of a large number of magnetic poles 9a with a pitch of p, and a comb-like shape with a pitch of p. A first yoke 1 has a plurality of magnetic poles 1a and a magnetic pole 1b shifted by Ap from the magnetic pole 1a, a plurality of magnetic poles 2a in a comb-teeth shape with a pitch p, and a magnetic pole 'A from the magnetic pole 2a.
A second yoke 2 having magnetic poles 2b shifted by p, a permanent magnet 3 whose N pole is connected to the magnetic pole 1a of the first yoke 1 and whose S pole is connected to the magnetic pole 2a of the second yoke 2, and the first yoke. The N pole is connected to the magnetic pole 1b of the second yoke 2, and the S pole is connected to the magnetic pole 2b of the second yoke 2.
A pair of yokes comprising a permanent magnet 4 whose poles are connected, a first excitation coil 5 which applies a pulsed magnetic field to the first yoke 1, and a first excitation coil 6 which applies a pulsed magnetic field to the second yoke 2. It is characterized by comprising a stator 8 on which the unit 7 is mounted, and a guide means for moving the movable element 9 along the stator 8.

However, the yoke unit 7 is different from the conventional yoke unit 20.
, and therefore yokes 1 and 24. York 2 and 25. Permanent magnets 3 and 27. Permanent magnets 4 and 28. Excitation coils 5 and 2
5. Excitation coils 6 and 26 correspond, respectively.

[Effect]

In the linear pulse motor according to the above method, a yoke is created within a range where the cumulative pitch of the pole teeth can be easily controlled, and a plurality of yoke units each including the yoke are combined in series, in parallel, or in a matrix, and mounted on a stator. It will be done.

As a result, it is possible to increase the stepping force of the linear pulse motor and increase the moving length of the mover without reducing accuracy, and it is also possible to increase the stepping force of the linear pulse motor and increase the moving length of the mover. Pulsmoke will be organized into a series, making it easier to design and manufacture them.

〔Example〕

Below, a linear pulse motor according to an embodiment of the present invention will be explained using the drawings.

Fig. 2 is a perspective view showing a Sawyer type linear pulse motor according to an embodiment of the present invention, Fig. 3 is a plan view of a movable element of the linear pulse motor, and Fig. 4 shows a magnetic circuit configuration of the linear pulse motor. The schematic diagram and FIG. 5 are explanatory diagrams of a method of driving the linear pulse motor using a 1-2 phase excitation force type.

In FIG. 2, the Sawyer type linear pulse motor 31 is
A stator 32 formed by forming a V-groove 34 on a substrate 35 on which a plurality of yoke units is mounted is placed above the stator 32 facing the V-groove 34.
A movable element 33 having a groove 36 formed in a substrate 37 moves stepwise in the direction of the arrow.

The movable element 33, which corresponds to the conventional movable element 13, has a fixed yoke 38, which forms a magnetic pole opposite to the magnetic pole of the yoke unit of the stator 32, on the lower surface of the substrate 37, and which corresponds to the conventional fixed yoke 17. Become.

In FIGS. 2 and 3, the stator 32, which corresponds to the conventional stator 12, has four sets of yoke units 71 to 74 mounted on the center part of the upper surface of a substrate 35 provided with a pair of grooves 34. , ■ A rotatable steel ball 40 held by a retainer 39 is mounted in the groove 34 . Yoke units 71 to 74 corresponding to yoke unit 7 in FIG. 1 each have the same configuration as the conventional yoke unit 20.

In FIG. 4, which is schematically illustrated using the same reference numerals as the yoke unit 7 for the constituent parts of the yoke units 71 to 74, the fixed yoke 38 forms a large number of magnetic poles 41, and each yoke unit 71 to 74 has a pair of magnetic poles. Yoke 1 and 2. Permanent magnets 3 and 4. It comprises excitation coils 5 and 6. However, in each yoke unit 71 to 74, yoke 2 is arranged so that the magnetic pole is shifted by V4p to the right with respect to yoke 1, and yoke unit 7 is arranged with respect to yoke units 71 and 72.
3 and 74 are arranged so that the magnetic poles are shifted to the right by IAp.

In the linear pulse smoke 31 in which the yoke units 71 to 74 are mounted on the stator 32 in this way, the yoke unit 71
A positive current that produces a magnetic field in the same direction as the magnetic field of the permanent magnet 3 or 4, or a reverse current that produces a magnetic field in the opposite direction to the magnetic field of the permanent magnet 3 or 4 is selectively applied to each of the excitation coils 5 and 6 of ~74. By flowing, the movable element 33 comes to perform stepwise motion. However, the strength of the forward and reverse currents flowing through the coils 5.6 is set to a value that generates a magnetic field comparable to the magnetic field strength of the permanent magnets 3 and 4.

Figure 5 shows the magnetic pole pitch p of 17 using the 1-2 phase excitation force formula.
When moving the movable element 33 step by step in step 8, the forward and reverse directions of the current flowing through each of the excitation coils 5 and 6 of the yoke units 71 to 74 are shown in step order.

In FIG. 5, first, as shown in drive step 1, a positive current is applied to the coils 5 of the yoke units 71 and 72 and the coils 6 of the yoke units 73 and 74. Then, a strong magnetic attraction force is generated between the magnetic poles 1a of the yoke units 71 and 72 and the magnetic poles 2a of the yoke units 73 and 74 with the movable magnetic poles 9a facing each other, and the magnetic poles 2a of the yoke units 71 and 72 2b.

A weak magnetic attraction force is generated between the magnetic poles 1a and 1b of the yoke units 73 and 74 and the magnetic pole 41 of the movable yoke 38 facing each other, and the mover 33 stops when these magnetic attraction forces are balanced. .

Next, as shown in driving step 2, a positive current is applied to each of the excitation coils 5 and 6 of the yoke units 71 to 74. Then, a strong magnetic attraction force is generated between the magnetic poles 1a and 2a of the yoke units 71 and 72 and the magnetic poles 1a and 2a of the yoke units 73 and 74, respectively, and the magnetic pole 41 of the movable yoke 38 facing each other, and the movable element 33 stops when their magnetic attraction forces are balanced, that is, after moving 1/8p to the right from the state of drive step 1.

Hereinafter, in the order of driving steps 3 to 8, the movable element 33 is
moves to the right by 1/8p, and if the driving steps 1 to 8 are reversed, the mover 33 moves to the left by 178p.

This linear pulse motor 31 has a stepping force four times that of the conventional linear pulse motor 11, and when the stepping force is twice that of the linear pulse motor 11, it is arranged in the moving direction of the movable element 33. By driving the yoke units 71 and 72 and the yoke units 73 and 74 separately, the moving distance of the movable element 33 becomes twice that of the conventional movable element 13.

The linear pulse smoke 31 of the embodiment described above is formed by arranging four yoke units 71 to 74 in a matrix. However, the present invention is not limited to such embodiments, and based on desired specifications, for example, a larger number of yoke units may be arranged in a matrix, or two or more sets of yoke units may be moved (stepped) by a mover. It should be noted that it is arranged and configured in a direction perpendicular to the direction or movement direction.

〔Effect of the invention〕

As explained above, according to the present invention, the yokes attached to the stator are unitized and the plurality of yoke units are offset, thereby increasing the stepping force or adjusting the stepping length to maintain high precision as desired. This has the effect of making extension extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the basic configuration of the present invention, FIG. 2 is a perspective view of the external appearance of a linear pulse motor according to an embodiment of the present invention, and FIG. A plan view, Figure 4 is a schematic diagram of the linear pulse smoke shown in Figure 2, Figure 5 is a diagram for explaining the driving method of the linear pulse smoke shown in Figure 2, and Figure 6 is an external appearance of the conventional linear pulse smoke. FIG. 7 is a bottom view of the mover and a plan view of the stator in FIG. 6, and FIG. 8 is a perspective view of the yoke unit and its yoke constituent members in FIG. 6. In the figure, ■ is the first yoke, la, lb, 2a, 2b, 9a, 41 are magnetic poles, 2 is the second yoke, 3.4 is a permanent magnet, 5 is the first excitation coil, 6 is the first 2 is an excitation coil, 7.71 to 74 are yoke units, 8.32 is a stator, 9 and 33 are movers, 31 is a linear pulse smoke, and 38 is a movable yoke. tea 2
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Claims (1)

[Claims] A first yoke (1
), a second yoke (2) in which a plurality of second magnetic poles are formed in a comb-teeth shape, and the first yoke in which the alignment direction of the second magnetic poles is aligned with the alignment direction of the first magnetic poles. (1) and the second yoke (2), a permanent magnet (
3, 4), a first excitation coil (5) that applies a pulsed magnetic field to the first yoke (1), a second excitation coil (6) that applies a pulsed magnetic field to the second yoke (2); a stator (8) in which a plurality of yoke units (7) equipped with a plurality of yoke units (7) are mounted facing the same direction in which the magnetic poles are arranged in the same direction; and the yoke unit (7) mounted on the stator (8). It is characterized by comprising a movable element (9) formed with a third magnetic pole opposite to the first and second magnetic poles, and a guide means for moving the movable element (9) in the arrangement direction of the magnetic poles. linear pulse motor.