JPS6389049A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To thin and miniaturize a linear pulse motor by arranging a permanent magnet generating magnetic flux parallel with the direction of the surface of a back plate and an electromagnet onto the back plate. CONSTITUTION:Permanent magnets 11a, 11b are disposed in parallel on a back plate 10, and magnetic flux in the direction parallel with the direction of the surface of the back plate 10 is generated in the opposite directions each mutu ally. Electromagnets 22a-22d are each arranged adjacently on both sides of the permanent magnets 11a, 11b on the back plate 10. These electromagnets 22a-22d respectively have poles 1, 2, 3, 4. A moving piece 23 has pole tooth rows 23a, 23b working to each magnetic flux of the electromagnets 22a-22d. The moving piece 23 is shifted in the direction rectangular to the direction of the magnetic flux of the electromagnets 22a-22d in response to the change of the magnetic flux.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Field of Industrial Use] The present invention relates to a linear pulse motor used, for example, in a printer.

(Prior Art) Conventionally, a linear pulse motor has a permanent magnet 511a disposed on a back plate 10, as shown in Figure FS5.
, Nb and permanent magnets 11a, 11t+ electromagnets 12a, 12. It is equipped with b. The permanent magnets 11a, Nb and the electromagnets 12a, 12b are
Each generates magnetic flux in a direction parallel to the thickness direction of the back plate 10. In this case, the permanent magnets 11a, Nb
are configured to generate magnetic fluxes in mutually opposite directions. The mover 13 includes N magnets 12a and 12b.
The back plate 10
move in a direction parallel to (arrow 14). Here, the back plate 10 is provided to prevent loss of magnetic energy of the motor.

Now, if a current is applied to the coil a of the electromagnet 12a in the direction shown in FIG. 5, the magnetic flux P1 of the permanent magnet 11a and the magnetic flux E1 of the electromagnet 12a will strengthen each other. At this time, electromagnet 1
No current is passed through coil b of 2b.

As a result, a strong magnetic flux is generated from the pole 1 of the electromagnet 12a, and the magnetic flux P1 and the magnetic flux E2 weaken each other at the pole 2.

In addition, at the poles 3 and 4 of the N magnet 121), the permanent magnet 11b
Only the magnetic flux P2 of is acting. Next, the current in the coil a of the electromagnet 12a is cut off, and the fifth coil is connected to the coil b of the electromagnet 12b.
When a current flows in the direction shown in the figure (dotted line), N magnet 1
Strong magnetic flux is generated only at pole 4 of 2b. As a result, the mover 13 moves to the right by 1/4 pitch compared to the previous state.

In this way, each coil a of the electromagnets 12a, 12b.

By the current switching control in b, the mover 13 can be moved in 1/4 pitch increments. By attaching, for example, a print head of a printer to this mover 13, the print head can be driven by a linear pulse motor.

By the way, as mentioned above, in the conventional linear pulse motor, the permanent magnet 11a is placed on the back plate 10.

11b, the electromagnets 12a and 12b, and the mover 13 are stacked one on top of the other, so there is a drawback that the structure of the motor as a whole becomes larger in the thickness direction.

(Problems to be Solved by the Invention) In a conventional linear pulse motor, the overall structure of the motor becomes large in the thickness direction. Therefore, when used in a printer or the like, there is a problem that the entire device becomes large.

An object of the present invention is to provide a linear pulse motor that allows the entire structure to be made thinner and the device that uses the motor to be more compact.

[Structure of the Invention] (Means and Effects for Solving Problems) The present invention is a linear pulse motor in which permanent magnets and electromagnets that generate magnetic flux parallel to the surface direction of the back plate are arranged on the back plate.

11 stones are placed adjacent to the permanent magnets on the back plate. The mover is configured to move in a direction perpendicular to the direction of the magnetic flux in response to changes in the magnetic flux of the electromagnet.

With such a structure, it is possible to reduce the thickness of the entire motor.

(Example) The present invention will be described in detail below with reference to the drawings. 1 and 2 are a plan view and a side view, respectively, showing the configuration of a linear pulse motor according to a first embodiment. As shown in FIG. 1, permanent magnets 11a and 11b are arranged in parallel on the back plate 10. Permanent magnet 11a,
11b are the back plates 1 in mutually opposite directions.
Generates magnetic flux in a direction parallel to two planes. As shown in FIG. 2, the electromagnets 22c and 22d are respectively arranged on the back plate 10 adjacent to both sides of the permanent magnet 11b.

Similarly, the electromagnets 22a and 22b are each arranged on the back plate 10 adjacent to both sides of the permanent magnet 11a.

The electromagnets 22a and 22b each have poles 1 and 2 that generate magnetic flux in directions opposite to each other and parallel to the surface direction of the back plate 10. Similarly, electromagnet 22C12
2d are in mutually opposite directions, and the back plate 10
It has poles 3°4 that generate magnetic flux in a direction parallel to the surface direction of the magnetic field. The mover 23 includes a first pole tooth row 23a and an electromagnet 22b, which are acted on by the magnetic fluxes of the electromagnets 22a and 22c.
It has a structure in which the second pole tooth row 23b that is acted on by each magnetic flux 22d is integrated.

Next, the effects of the first embodiment will be explained. First, as a basic operation, as shown in Fig. 1, for example, coil b
Assume that a current is applied to coil a, and the current is turned off to coil a. In this case, at the pole 4 of the electromagnet 22c, the flux P2 and the magnetic flux E4 of the permanent magnet 11b act to strengthen each other. Similarly, at pole 4 of electromagnet 22d, permanent magnet 1
The magnetic flux P2 and the magnetic flux E4 of 1b act to strengthen each other. At the 8th angle 3 of the electromagnets 22c and 22d, the magnetic flux P2 and the magnetic flux E3 of the permanent magnet 11b act to weaken each other. As a result, the electromagnets 22c and 22d
A strong magnetic flux is generated from the multi-pole 4. In addition, the electromagnet 22a
.

Only the magnetic flux P1 of the permanent magnet 11a acts on the multi-poles 1 and 2 of 22b.

Next, when the current in coil b is cut off and current is applied to coil a in the direction shown in FIG. 1 (dotted line), electromagnet 22a,
A strong magnetic flux is generated only in the multipole 1 of 22b. That is, in the multipole 1, the magnetic flux P1 and the magnetic flux [1 of the permanent magnet 11a act to strengthen each other. In addition, electromagnets 22a and 22b
In the multipole 2, the magnetic flux P1 and the magnetic flux E of the permanent magnet 11a are both
2 act to weaken each other. Electromagnet 22c,
In the multipole 3, 4 of 22d, the magnetic flux P2 of the permanent magnet 11b
only is working. As a result, for the previous state,
The mover 23 will move by 1/4 pitch. In this way, by switching the currents of the coils a and b, the mover 23 can be moved by 1/4 pitch.

By attaching, for example, a print head of a printer to this mover 13, the print head can be driven by a linear pulse motor.

In such a linear pulse motor, as shown in FIG. 2, a permanent magnet 11b (lla) is placed on the back plate 10.
and electromagnets 22c, 22d (22a, 22b
) are adjacent to each other, and the directions of their respective magnetic fluxes are parallel to the surface direction of the back plate 10.

Therefore, compared to the conventional stacking type motor as shown in FIG. 5, the motor can be made thinner overall.

FIG. 3 is a plan view of a second embodiment of the invention.

In the second embodiment, in the electromagnets 22a and 22b adjacent to both sides of the permanent magnet 11a, a current is passed through the coil a on the electromagnet 22a side, and the electromagnet 22a
, 22b are configured to allow current to flow through the coil b. With such a configuration, the permanent magnet 11b and the electromagnets 22C and 2 are different from the first embodiment.
2d can be omitted and the number of parts can be reduced.

Also in the second embodiment, although not shown in FIG. 3, there are a permanent magnet 11a and an N magnet 2 on the back plate 10.
2a and 22b are adjacent to each other, and are arranged such that the direction of their respective magnetic fluxes is parallel to the surface direction of the back plate 10. Therefore, similarly to the first embodiment, it is possible to obtain the effect of making the entire motor thinner.

FIG. 4 is a plan view of a third embodiment of the present invention.

In the third embodiment, as shown in FIG.
, 22b are permanent magnets 11a whose magnetic fluxes are in opposite directions.
and 21a are arranged adjacent to the permanent magnet formed in parallel. Similarly, electromagnets 22c and 22d
are arranged adjacent to a permanent magnet formed by parallel permanent magnets 11b and 21b whose magnetic fluxes are in opposite directions.

With such a configuration, for example, if current is applied to coil a and current is turned off to coil b, electromagnet 2
In the multipole 1 of 2a and 22b, the magnetic flux P1 and the magnetic flux E1 of the permanent magnet 11a act to strengthen each other. Further, in the multipole 2 of the m1 stones 22a and 22b, the magnetic flux P2 and the magnetic flux E2 of the permanent magnet 21a act to weaken each other. Furthermore, the multipole 3 of the electromagnets 22c and 22d
In this case, only the magnetic flux P1 of the permanent magnet 21b is acting.

Further, only the magnetic flux P2 of the two permanent magnets 11b acts on the multipole 4 of the electromagnets 22c and 22d.

Next, when the current in coil a is cut off and current is applied to coil b in the direction shown in FIG. 4 (solid line), electromagnets 22C and 2
A strong magnetic flux is generated only in the 2d multi-pole 4. That is, multipole 4
Then, the magnetic flux P2 and the magnetic flux E4 of the permanent magnet 11b act to strengthen each other. In addition, in the multi-pole 3, both permanent magnets 21
The magnetic flux P1 and the magnetic flux E3 of b act to weaken each other. Only the magnetic flux P1 of the permanent magnet 11a and the magnetic flux P2 of the permanent magnet 21a act on the multipoles 1 and 2 of the electromagnets 22a and 22b, respectively. As a result, the mover 23 moves by 1/4 pitch compared to the previous state.

In this way, the moving element 23 can be moved by 1/4 pitch by controlling the current switching of the coils a and b.

With this configuration of the third embodiment, the method for winding each coil a and b is simpler than that of the first embodiment.
Further, there is an advantage that the moving pitch of the mover 23 can be made small. In the third embodiment as well, although not shown in FIG.
a, 21a and electromagnets 22a, 22b are adjacent to each other, and are arranged such that the direction of their respective magnetic fluxes is parallel to the surface direction of the back plate 10. Furthermore, permanent magnets E111b and 21b and electromagnets 22c and 22d are arranged adjacent to each other on the back plate 10, with the direction of their magnetic flux parallel to the surface direction of the back plate 10. Therefore, similarly to the first embodiment, it is possible to obtain the effect of making the entire motor thinner.

[Effects of the Invention] As described in detail above, according to the present invention, the thickness of the linear pulse motor can be made thinner, and the motor as a whole can have a thinner structure. Therefore, when the linear pulse motor of the present invention is used, it is possible to downsize the device used.

Additionally, compared to conventional methods, the number of permanent magnets can be reduced, reducing the number of parts that make up the motor, and the method of winding the coil around the electromagnet can be simplified. .

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration of a linear pulse motor according to a first embodiment of the present invention, FIG. 2 is a side view of the first embodiment, and FIG. 3 is a plan view of a linear pulse motor according to a second embodiment of the present invention. FIG. 4 is a plan view showing the structure of a linear pulse motor according to a third embodiment, and FIG. 5 is a side view showing the structure of a conventional linear pulse motor. 10-... Back plate, 11a, 11b,
21a, 21b...Permanent magnet, 12a, 12
b, 22a to 22d =... electromagnet, 13, 23
... Mover, 23a, 23b... Polar tooth row. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 4

Claims (3)

[Claims] (1) In a linear pulse motor consisting of a back plate, a permanent magnet, an electromagnet, and a slider, the permanent magnet is disposed on the back plate and generates magnetic flux in a direction parallel to the surface direction of the back plate; An electromagnet that is placed adjacent to the permanent magnet on the back plate and generates magnetic flux in a direction parallel to the surface direction of the back plate; A linear pulse motor characterized in that it is equipped with a mover that moves in a right angle direction. (2) The linear pulse motor according to claim 1, wherein the electromagnets are arranged on the back plate adjacent to both sides of the permanent magnet with respect to the magnetic flux direction of the permanent magnet. (3) The mover includes a first pole tooth row and a second pole tooth row that are acted on by the magnetic flux of each electromagnet disposed adjacent to both sides of the permanent magnet, and 3. The linear pulse motor according to claim 2, wherein the linear pulse motor is configured to move in a direction perpendicular to the direction.