JPS5854736B2 - linear pulse motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a near pulse smoker in which a movable part moves linearly.

FIG. 1 is a longitudinal sectional view of a conventionally known linear pulse motor.

In the figure, 1 is a running path (stator) made of magnetic material.
, 2 is a movable part that faces the running path 1 with a slight gap therebetween, and here it is composed of two U-shaped field cores 21 and 22 that are connected to each other via a permanent magnet 20.

In the U-shaped field cores 21 and 22 of the movable part 2, the distance between the ends (teeth) of the protrusions (teeth) 1 provided on the running path 1 is
1.It deviates by P/2 from the interval P of 12,
Further, the U-shaped field cores 21 and 22 are connected to each other so as to be offset by P/4.

Field windings 31.degree. 32 are wound around each U-shaped field core 2L22, and the magnetic flux from the permanent magnet 20 is controlled by selectively applying current to these.

In this device, when an excitation current is first passed through the field winding 32 as shown by the solid arrow, the magnetic flux passing through the tooth @ decreases and the magnetic flux passing through the tooth O increases.

Therefore, the tooth e) and the tooth 16 on the running path 1 side attract each other, and the movable part 2 is held at the position shown in the figure.

Next, when an excitation current is applied to the field winding 31 as shown by the broken line arrow, the magnetic flux passing through the tooth @ increases, the tooth @ and the tooth 14 are attracted to each other, and the movable part 2 moves to the left [P/4]. and stop.

Next, an exciting current is applied to the field winding 32 in the direction opposite to the solid arrow to draw the teeth 17 together, thereby moving the movable part 2 further to the left by P/4.

In this way, the movable part 2 can be moved along the travel path 1 at a pitch of P/4 by alternately passing the excitation current through the excitation winding 3L32 and changing the direction of the flow.

By the way, the conventional linear pulse smoke having such a structure has the drawback that the movable part 2 has the permanent magnet 20, which increases its weight and makes it impossible to obtain high acceleration.

The present invention aims to reduce the weight of the movable part 2 by providing a permanent magnet on the traveling road side, and to realize a linear pulse smoke that can obtain high acceleration.

FIG. 2 is a configuration diagram showing an embodiment of the present invention, in which A is a longitudinal sectional view, B is a BB sectional view of FIG.
D is a tooth surface diagram of the running path 1.

In the device of the present invention, the running path 1 has comb-shaped teeth (
It consists of a pair of iron cores ia, 1b having protrusions) and a permanent magnet 10 connecting the pair of iron cores 1a, 1b.

This pair of iron cores la. The pitches of the teeth provided on the running surface of 1b are all a constant pitch P, and they are arranged offset from each other by P/2 as shown in the second diagram.

In the movable part 2, the ends of the U-shaped field cores 21 and 22 ■
A plurality of teeth (three in this case) are formed at ~@ at the same pitch as the teeth provided on the traveling path 1, and each U-shaped field core 21, 22 is are interconnected.

In each U-shaped field core 2L22, the pair of ends ■ and @■ (○ and @) are separated from each other by (N-+-T)P (N is an integer and is 3 in this embodiment), and Between each U-shaped iron core 2L22,
n is an integer, m is a fractional number, but m '') n
(.

1 In this example, they are spaced apart by (7+-)P or (8-7)P).

In addition, each U-shaped field core 21, 22 has a field winding 31,
32 is wound.

In the device 1 constructed in this way, one iron core 1 is disposed between the running path 1 and the movable part 2, as shown in FIG. 2B.
, the U-shaped field core 22, and the magnetic flux of the permanent magnet 10 directed toward the other core 1b.

Now, when an excitation current is passed through the field winding 31, a magnetic flux as shown by the broken line in FIG.

Therefore, the magnetic flux increases between the end ■ and the iron core 1a and between the end ◎ and the iron core 1b, and conversely between the end @ and the iron core 1a and between the end ■ and the iron core 1b. The magnetic flux decreases at .

Therefore, the movable part 2 is held at the position shown in FIG. 2A.

Here, the attractive force between the running path 1 and the movable part 2 increases in proportion to the square of the magnetic flux density.

Next, when an exciting current is passed through the field winding 32 so that the magnetic flux within the iron core 22 is generated in the direction of the arrow a, the magnetic flux between the end @ and the iron core 1a and between the end O and the iron core 1b increases, and the movable part 2 moves to the left by P/4.

Conversely, when an excitation current is applied to the field winding 32 so that the magnetic flux within the iron core 22 is generated in the direction of the arrow, the movable part 2 moves to the right side P/
Move by 4.

In this way, by alternately passing the excitation current through the excitation winding 3L32 and changing the direction of the flow, the movable portion 2 can be moved along the running path 1 at a pitch of P/4.

According to such a configuration, a permanent magnet is not required on the movable part 2 side, and the weight of the movable part can be reduced, so that a linear pulse smoke with high acceleration can be realized.

FIG. 3 is a block diagram of another embodiment of the present invention.

In this embodiment, the teeth on which the pair of iron cores 1a and 1b constituting the travel path 1 are arranged are aligned in the same phase, and the movable part 2 is arranged so that each field iron core 21
．． A plurality of teeth (in this case, three teeth and two teeth) are formed on the end portion facing the iron core 1a and the end portion facing the iron core 1b of No. 22, which are aligned with an offset of P/2.

The operation in this case is exactly the same as that of the apparatus shown in FIG.

In each of the above embodiments, two U-shaped field cores are connected, but a plurality of U-shaped field cores may be connected to increase the torque.

As explained above, since the device according to the present invention has a structure in which the permanent magnet is provided on the road side, the weight of the movable part can be reduced, and a linear pulse smoke with high acceleration can be realized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the structure of a conventionally known linear pulse smoke.
2 and 3 are configuration diagrams showing one embodiment of the present invention, in which A is a vertical sectional view, B is a BB sectional view of FIG.
is a tooth surface diagram of the movable part, and D is a tooth surface diagram of the running path. DESCRIPTION OF SYMBOLS 1... Running path, 1a, lb... Pair of iron cores, 10... Permanent magnet, 2... Moving part, 21, 22...・・Field iron core, 31.32・・
...Field winding.

Claims (1)

[Scope of Claims] 1. In a linear pulse smoke composed of a running path and a movable part having a plurality of field cores that move along the running path, the running path is arranged at the same pitch 1 and 1. It consists of a pair of iron cores in which P teeth are formed and whose phases are shifted by 100 P, and a permanent magnet interposed between these iron cores, and the end portion of the field iron core that constitutes the movable part. The mutual spacing is set to be shifted by (N+T)P (N: integer) from the pitch P of the teeth provided on the pair of iron cores on the running path, and the mutual spacing of each field core is set to (N+)P.
(m: number of ends m, n is an integer with the relationship m>n).A linear pulse smoke. 2 A pair of iron cores constituting the running path are arranged so that the phases of the teeth provided on these are arranged in the same phase, and a phase of each other is arranged at the end opposite to the pair of iron cores of the field core constituting the movable part. The linear pulse smoke according to claim 1, wherein a plurality of teeth are formed which are shifted by ±P.