JPS6392255A - Manufacture of primary core of linear pulse motor - Google Patents

Abstract

PURPOSE:To increase a winding space and reduce consumption power, by fitting a second magnetic member firmly to a permanent magnet with a non-magnetic member, and fitting them firmly to a magnetic unit wound up with an excitation coil, to be cut off every pole. CONSTITUTION:The primary core of a linear pulse motor is manufactured by using a magnetic member 10 having four magnetic pole units 11, and on the opposite surface of the member 10, magnetic pole teeth 12 are formed by means of plating or the like. Besides, a magnetic member 13, a permanent magnet 14, and a non-magnetic member 15 for short-circuiting the magnetic units 11 which are firmly fitted with bonding agent are used, and after the magnetic pole units 11 of the magnetic member 10 are wound up with excitation coils 16, the magnetic units 11 and the magnetic member 13 are jointed to each other to form the primary core. Finally, slits 17 are formed on the jointed magnetic member 10 by a cutter or the like, and the member 10 is cut off to be separated from the slits to form the respective magnetic poles independently. Then, the relative positional shift of the magnetic pole teeth 12 is avoided, and an assembling process can be facilitated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a linear pulse motor in which a primary core or a secondary core moves by a predetermined distance in response to an input pulse, and particularly relates to a linear pulse motor in which a primary core or a secondary core moves by a predetermined distance in response to an input pulse. This invention relates to a method for manufacturing a core.

[Conventional technology]

FIG. 2 shows a schematic diagram of a conventionally well-known linear pulse motor. The mover 20 has a permanent magnet 23 installed between U-shaped magnetic members 21 and 22, and the magnetic member 21
．． It is constructed by winding excitation coils 24 and 28 around 22. The permanent magnet 23 is magnetized as shown by a symbol 27 indicating the direction of magnetization. The stator 25 is formed with unevenness 26 corresponding to the step pitch.

FIGS. 3(a) to 3(d) are diagrams illustrating the operating principle of the linear pulse motor shown in FIG. 2.

The excitation coil 24 wound around the magnetic material 21 is connected in series so that the polarities of the magnetic poles (1) and (2) are opposite to each other. Similarly, an excitation coil 28 is wound around the magnetic material 22 so that the polarities of the magnetic poles (1) and (2) are opposite to each other. When a current is applied to the excitation coil 24 in the direction shown by the arrow to excite it, the magnetic field is strengthened at the magnetic pole ■, and the magnetic pole ■
In this case, the magnetic field of the permanent magnet and the magnetic field of the electromagnet cancel each other out, so the mover 20 stops at the position shown in FIG. 3(a).

At this time, on the side of the magnetic material 22, since no current is flowing through the excitation coil 28, the magnetic force is balanced. Next, when the excitation coil 24 is demagnetized and a current is passed through the excitation coil 28 in the direction of the arrow as shown in FIG. moves in the direction of motion shown by the arrow in the figure, and as shown in Figure 3 (
The mover stops at the position shown in b). In other words, the movable element 20 has moved by 1/4 pift in the movement direction of the arrow. Thereafter, the movable element is linearly moved in the same manner as shown in FIGS. 3(C) and 3(d).

In order to make the step pitch of the mover finer,
As shown in FIG. 4, it is necessary to form magnetic pole teeth 42 and 44 on the opposing surfaces of each magnetic pole 41 of the mover and the magnetic pole 43 of the stator. Therefore, in order to make the step pitch even finer, the magnetic pole teeth 42 and 44 can be made finer, but in reality, it depends on magnetic saturation, the distance between the mover and the stator, etc. Limits arise.

Conventionally, in order to form these magnetic pole teeth, in addition to etching the magnetic pole nut, electrical discharge machining, press working, etc., as described in detail in Japanese Patent Publication No. 59-8146, the method of forming the magnetic pole teeth was to form a plurality of magnetic pole bodies. A method has been proposed in which a slit plate with teeth formed thereon is bonded.

[Problem that the invention seeks to solve]

When magnetic pole teeth are formed by etching, each magnetic pole is independent, resulting in non-uniformity of the material.

Uneven surface polishing, uneven application of resist material,
Alternatively, the torque curve of each phase changes due to various causes such as relative positional deviation of the magnetic pole teeth, and therefore, there is a drawback that a good value cannot be obtained for the feed accuracy of the linear pulse motor.

In addition to forming magnetic pole teeth by etching, there are methods such as electrical discharge machining, press working, and electrohoming, but in the same way, since each magnetic pole is independent, the relative positional deviation of the formed magnetic pole teeth can be avoided. It's difficult.

As one method for solving this problem, the method described in the aforementioned Japanese Patent Publication No. 59-8146 is shown in FIG. In the figure, 51 is a slit plate, 52a and 521)
are the magnetic pole bodies 52a, 52a!, respectively. and 52bl
.

52b2, and FIG. 5(a) is an exploded view of the slit plate 5 and the magnetic materials 52a and 52b.
FIG. 5(b) is a diagram showing a state in which a slit plate 51 (indicated by a phantom line) is fixed to the magnetic pole body. In addition, 53a in the figure,
53b is a contact plate for fixedly supporting the magnetic materials 52a and 52b. .

According to this method, the magnetic pole bodies 52 a +, 52 a z
, 52 b +.

The slit plate 51 is bonded to 52b2 using an adhesive.

The magnetic pole teeth 51a of the slit plate 51 are the magnetic pole bodies 52a +, 5
2a z.

Corresponding to the arrangement of 52b1. After that, make incisions L+ and Lz with a cutter or the like and cut off the unnecessary parts. With this method, relative displacement of the magnetic pole teeth can be avoided.

The magnetic pole teeth 51a of the slit plate 51 are formed by punching or photoetching. Slit plate 51 formed by such a processing method
consists of a magnetic pole tooth 51a and an edge 51b, and the magnetic pole tooth 51a
When the pitch of the magnetic pole teeth is large, accuracy is easily maintained, but as the pitch of the magnetic pole teeth becomes smaller, it becomes necessary to reduce the thickness of the slit plate 51 itself, which distorts the formed magnetic pole teeth and reduces accuracy. The problem has arisen that it is no longer possible to maintain the

In addition, magnetic pole bodies 52a++52az, 52b+, 52bz
Since the bonded area between the slit plate 51a and the individual magnetic pole teeth 51a becomes smaller, there is a possibility that the adhesion will be separated by the attraction force, and there is also a possibility that the magnetic pole teeth will be damaged when cutting the slit plate 51. is high (there was a problem with reliability).

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a primary core of a linear pulse motor that avoids relative displacement of magnetic pole teeth, has an easy assembly process, and is highly reliable.

[Means for solving problems]

The method for manufacturing the primary core of the linear pulse motor of the present invention includes:
Magnetic pole teeth are formed on the surface opposite to the surface on which the magnetic pole bodies are provided of the first magnetic material having at least four magnetic pole bodies, and the second magnetic material short-circuiting the magnetic pole bodies is made of a permanent magnet. The magnetic pole body is fixed with a non-magnetic material, an excitation coil is wound around the magnetic pole body, the magnetic bar body and the second magnetic material are fixed, and the first magnetic material is separated for each pole, thereby making each pole independent. It is characterized by forming a magnetic pole.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1(a) to 1(d) are explanatory diagrams of a method of manufacturing a primary core of a linear pulse motor according to an embodiment of the present invention.

First, as shown in FIG. 1(a), a magnetic material 10 having four magnetic pole bodies 11 is prepared. The magnetic material 10 is made of a material such as pure iron, which has low coercive force and high saturation magnetic flux density. Next, as shown in FIG. 1(b), the magnetic material 10
The magnetic pole teeth 12 are formed by half etching or plating on the surface opposite to the surface on which the magnetic pole body 11 is provided.

In this case, the magnetic pole teeth 12 are formed to be perpendicular to the side surface of the magnetic material 10 as a reference. Since the magnetic pole teeth 12 formed by such a method do not penetrate the magnetic material 10, they are stable even when the feed pitch becomes small, and can maintain high precision. The side surface of the magnetic material 10 is a reference surface, and mask alignment is performed based on this surface.

On the other hand, as shown in FIG. 1C, a magnetic material 13, a permanent magnet 14, and a non-magnetic material 15 that short-circuit the magnetic pole body 11 are fixed using an adhesive. The permanent magnet 14 may be made of various materials such as ferrite, samarium cobalt, and neodymium iron depending on the required torque.

For example, aluminum is used as the non-magnetic material 15. Although not shown in the figure, a bearing mechanism that maintains a gap with the secondary core is attached to the nonmagnetic material 15.

Next, as shown in FIG. 1(d), after winding the excitation coil 16 around the magnetic pole body 11 of the magnetic material 10, the magnetic pole body 11 and the magnetic material 13 are joined to form a primary core.

When joining, the magnetic pole teeth 12 of the magnetic material 10 are perpendicular to the traveling direction of the linear pulse motor based on the reference plane of the side surface of the magnetic material 13 and the reference surface of the non-magnetic material 15. .

Finally, a cut 17 is made in the bonded magnetic material 10 using a cutter or the like to separate it, thereby forming each magnetic pole independently.

〔Effect of the invention〕

In the case of the conventional method of joining the slit plate to the magnetic pole body, the magnetic pole area is limited by the area of the magnetic pole body, and even more! This was the area of the magnetic pole teeth of the slit plate bonded to the scraper. In contrast, in the present invention, the magnetic pole teeth formed in the magnetic material do not penetrate, so the joining surfaces are flat and flat.
Moreover, the area of the magnetic pole body can be made smaller than the area of each magnetic pole tooth formed by cutting. This allows for a larger winding space, thereby reducing power consumption.

In addition, cutting when conventional slit plates are bonded has a high possibility of causing damage to the magnetic pole teeth, which poses problems in terms of reliability.However, according to the present invention, cutting is stable even when cutting, and there is no damage to the magnetic pole teeth. can be prevented, and a highly reliable primary core can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a method for manufacturing the primary core of a linear pulse motor according to an embodiment of the present invention, Fig. 2 is a schematic diagram of a conventionally well-known linear pulse motor, and Fig. 3 is a linear pulse motor. 4 is a sectional view showing a part of a conventional linear pulse motor. FIG. 5 is an explanatory diagram of an example of a conventional method for manufacturing a primary core. 10.13.21, 22.52a, 52b ---
Magnetic material 11.52a+, 52az, 52b, 52
bz ” 'Magnetic pole body 14.23...Permanent magnet 15...Non-magnetic material 12.51a, 42.44...Ta pole tooth 16.24.
28... Coil 17, L, L,... Notch 20... Mover 25... Stator 41.43... Magnetic pole 51... ...Slit plate (a) (b) (C) (d) Fig. 1 Fig. 2 Fig. 4 & Hand direction (a) (b) (C) Fig. 3 3a (a) 3a Fig. 5

Claims (1)

[Claims] (1) A second magnetic material that short-circuits the magnetic pole bodies by forming magnetic pole teeth on the surface opposite to the surface on which the magnetic pole bodies are provided of the first magnetic material having at least four magnetic pole bodies. fixed by a permanent magnet and a non-magnetic material, winding an excitation coil around the magnetic pole body, fixing the magnetic pole body and the second magnetic material,
A method of manufacturing a primary core of a linear pulse motor, comprising: forming independent magnetic poles by separating the first magnetic material into each pole.