JPS63198571A - Manufacture of pole tooth of primary core for linear pulse motor - Google Patents

Abstract

PURPOSE:To improve the mechanical accuracy of a linear pulse motor by forming a set of nonmagnetic materials except sections corresponding to pole teeth to be attached to the pole of a primary core, and inserting a magnetic material thereto to form pole teeth. CONSTITUTION:The pole teeth of a primary core 1 for a linear pulse motor use a set of nonmagnetic materials 11, 13, and are molded in a metal cast except sections 12, 14 corresponding pole teeth to be mounted on a magnetic material. The material 15 for forming the pole teeth is press-fitted to the midway of the section 14 corresponding to the pole teeth of one material 13, the material 11 is placed on an uniform surface, the materials 11, 13 are positioned, and completely press-fitted to the material 15. Pole teeth 17 are formed by etching at the nonmagnetic material. Thus, wire disconnection or distortion due to cutting can be eliminated.

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 a predetermined distance in response to an input pulse. This invention relates to a tooth manufacturing method.

(Prior Art) FIG. 2 shows a schematic diagram of a conventionally well-known near-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 coils 24 wound around the magnetic material 21 are 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 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,
At the magnetic pole (2), the magnetic field is strengthened, and at the magnetic pole (2), the magnetic field of the permanent magnet and the magnetic field of the electromagnet cancel each other out, so that the mover 20 stops at the position shown in FIG. 3(a). At this time, since no current is flowing through the coil 28 on the side of the magnetic material 22, the magnetic force is balanced. Next, when the coil 24 is demagnetized and a current is passed through the coil 28 in the direction of the arrow, the magnetic pole ■
As a result, the magnetic field is strengthened at the magnetic pole ① and cancels each other out at the magnetic pole ①, so that the mover moves in the direction of movement shown by the arrow in the figure, and the mover stops at the position shown in FIG. 3(b).

That is, the mover 20 has moved by 1/4 pitch in the direction of movement indicated by the arrow. Thereafter, the movable element is linearly moved in the same manner.

In order to make the step pitch of the mover finer,
As shown in FIG. 4, each magnetic pole 41 of the mover and the stator 4
3, it is necessary to form magnetic pole teeth 42 and 3 on each opposing surface. Therefore, in order to make the step pitch even finer, the magnetic pole teeth 42 and 43 can be made finer, but in reality, magnetic saturation and the distance between the mover and the stator (hereinafter referred to as Limits arise due to factors such as gaps (called gaps). As a method for forming these magnetic pole teeth,
-8146 publication is known. This method will be explained based on the drawings. FIG. 5 shows a slit plate, FIG. 6 shows the basic structure of a mover magnetic pole group obtained by combining magnetic pole bodies, and FIG. 7 shows a magnetic pole group obtained by this method. First, as shown in FIG. 6, a plurality of magnetic pole bodies 52al.

52a2, 52bl, and 52b2 are integrally assembled. Next, the slit plate 51 on which the magnetic pole teeth 51a, 51b are formed is glued to the magnetic pole bodies 52a1, 52a2, 52b, 52b2, and the slit plate is attached to the line "b" along both ends of the magnetic pole teeth.
Cut at 2 and analyze. The slit plate is a plate of magnetic material in which a pattern corresponding to the magnetic pole teeth is formed by etching or pressing.

(Problems to be Solved by the Invention) In the above manufacturing method, in order to form an independent magnetic pole body,
A step of cutting is required after adhering the slit plate to the magnetic pole body. To cut, each magnetic pole is separated using a cutter or the like, but the strain and heat applied during this process can cause deterioration of the characteristics of the magnetic material itself or breakage of the excitation coil.

In view of the above, an object of the present invention is to provide a method for manufacturing magnetic pole teeth of a primary core that does not require a cutting step and is therefore highly reliable.

(Means for Solving the Problems) The present invention provides a magnetic material having low coercive force and high saturation magnetic flux density.
A secondary core is formed with a plurality of magnetic pole teeth corresponding to the step pitch, and a magnetic material having low coercive force and high saturation magnetic flux density is provided with a magnetic material that is closely opposed to the surface having the magnetic pole teeth of the secondary core and has the magnetic poles. The primary core has magnetic pole teeth fixed to the magnetic pole body so as to obtain a desired step pitch in combination with the teeth, and a permanent magnet is attached to generate force by magnetic coupling with the magnetic pole teeth of the secondary core. In a linear pulse motor configured with an excitation coil wound around a core, a set of non-magnetic material is formed in a mold excluding a portion corresponding to the magnetic pole teeth attached to the magnetic pole body, and the non-magnetic material is formed with a mold. After press-fitting the magnetic material halfway into the magnetic pole tooth portion of one of the magnetic materials, correctly positioning the pair of non-magnetic materials, completely press-fitting the magnetic material, and forming the magnetic pole teeth by etching or press working. It is characterized by what it did.

(Function) Magnetic pole teeth are formed in the primary core and secondary core of the present invention to correspond to the step pitch, and permanent magnets are attached so that the magnetic pole teeth generate force through magnetic coupling. has been done. For the primary core, first, a set of non-magnetic material is formed excluding a portion corresponding to the magnetic pole teeth attached to the magnetic pole body of the primary core, and a magnetic material is inserted into this to form the magnetic pole teeth. Since this is fixed to the magnetic pole body, mechanical accuracy is improved.

Furthermore, since the primary core can be processed as a single unit, there is no need to take steps such as cutting.

(Example) The present invention will be described in detail below using the drawings.

FIGS. 1(a) to 1(g) are diagrams illustrating a method of manufacturing magnetic pole teeth of a linear pulse motor primary core according to an embodiment of the present invention. FIGS. 1(a), (b), (c), and (d) show a top view and a cross-sectional view taken along AA' and BB' of a set of non-magnetic materials 11.13. This set of non-magnetic materials 11.13
is formed by a mold except for portions 12 and 14 corresponding to the magnetic pole teeth to be attached to the magnetic pole body. This non-magnetic material 11.13
By using, for example, 5US403 or brass, it will not be corroded by etching, so that resist application in the etching process can be omitted. Next, Figure 1 (C).

As shown in (d), the magnetic material 15 forming the magnetic pole teeth is press-fitted halfway into the portion 14 of one of the non-magnetic materials 13 corresponding to the magnetic pole teeth. Next, the non-magnetic material 1 shown in FIG.
1 on a uniform surface as shown in Figure 1(e),
The non-magnetic materials 11 and 13 are properly aligned, and the punch 16 is used to completely press-fit the magnetic material 15 into the non-magnetic material 11.

This state is shown in Figure 1 (O).Next, the magnetic material 1
Magnetic pole teeth 17 are formed on the press-fitted non-magnetic material 11 of No. 5 by etching or press working as shown in FIG. 1(g). This makes it possible to eliminate disconnection or distortion caused by cutting, which has been a problem in the past.

(Effects of the Invention) As described above, according to the present invention, a linear pulse motor that is highly reliable and has a highly accurate feed pitch can be realized.

Diagram 2 explaining the method for manufacturing the magnetic pole teeth of the motor primary core.
The figure is a schematic diagram of a conventionally well-known linear pulse motor, FIG. 3 is a perspective view showing a dynamic ret plate of a linear pulse motor, and FIG. 6 is a basic configuration diagram of a conventional mover magnetic pole group.
FIG. 7 is a diagram showing a conventional magnetic pole group.

11.13...Nonmagnetic material, 12.14...Portion corresponding to magnetic pole teeth, 15.21.
22...Magnetic material, 16...Punch, 17.4
2.44... Magnetic pole tooth, 20... Mover, 23
...Permanent magnet, 24.28... Exciting coil, 25.43... Stator, 41... Magnetic pole, 51... Slit plate,

Claims (1)

[Claims] A secondary core in which a plurality of magnetic pole teeth are formed in a magnetic material having low coercive force and high saturation magnetic flux density so as to correspond to the step pitch; Fixing magnetic pole teeth to the magnetic pole body so as to closely face the surface having magnetic pole teeth of the core and obtain a desired step pitch by combination with the magnetic pole teeth, and magnetically coupling with the magnetic pole teeth of the secondary core. A method for manufacturing a primary core of a linear pulse motor, which comprises a primary core equipped with a permanent magnet so as to generate force, and an excitation coil wound around the primary core, wherein the primary core is attached to the magnetic pole body. After forming a set of non-magnetic materials excluding the portions corresponding to the magnetic pole teeth, and press-fitting the magnetic material halfway into one of the non-magnetic materials into the portions corresponding to the magnetic pole teeth, A method of manufacturing magnetic pole teeth for a primary core of a linear pulse motor, characterized in that the magnetic material is completely press-fitted by correctly positioning the material, and the magnetic pole teeth are formed by etching or press working.