JPS63242162A - Assembling method for linear pulse motor - Google Patents

Abstract

PURPOSE:To improve positioning precision, by arranging a plurality of round rods having diameters equal to the tooth pitches of primary and secondary side magnetic-circuits, in close contact with each other on a plane. CONSTITUTION:On the sheet 10 of a ferromagnetic unit, four magnetic poles 10a-10d are formed, and at the tip of each magnetic pole, four teeth 12 are formed. On the surface of the base 14 of a non-magnetic unit, four grooves 11, 13, 15, 17 which can respectively contain three round rods 16 having diameters equal to the tooth pitches of the sheet 10 in close contact with each other are arranged. The round rods 16 are mounted on each of the grooves three pieces by three pieces in close contact with each other, and are fixed with adhesives 18. Besides, on the back side surface of the base 14, an electromagnet 24 with a core 20 wound up with a coil 22 is set. As a result, at the respective tooth positions, the sheet 10 is positioned by the round rods 16, and so in the whole area of the teeth, the sheets with aligned teeth can be laminated. Besides, the precision of the average dimension of the teeth after the lamination is heightened.

Description

Detailed Description of the Invention Overview In a method for assembling a magnetic circuit for a linear pulse motor, a plurality of round bars having a diameter equal to the tooth pitch of the magnetic circuit are closely arranged on a plane, and a plurality of round bars arranged in this way are A thin plate of ferromagnetic material with irregularities formed at a tooth pitch perpendicular to the round bar is brought into contact with the round bar, and multiple sheets are laminated in the direction of the round bar, and the thin plates thus laminated are integrally bonded with adhesive, etc. A method of assembling a linear pulse motor characterized by fixation.

With this assembly method, a linear pulse motor with uniform tooth traces and high positioning accuracy can be manufactured.

TECHNICAL FIELD The present invention relates to a method of assembling a linear pulse motor, and more particularly to a method of assembling a magnetic circuit of a linear pulse motor.

Many devices that move or position a controlled object on a one-dimensional or two-dimensional plane use a rotary motor and a mechanism that converts rotational motion into linear motion. In contrast, recently the controlled object is attached directly to the motor,
Development of a linear motor to drive this linearly is progressing.

Linear motors have a simple structure and are superior in terms of lifespan, accuracy, etc., and are expected to be used in a wide range of fields, including the field of OAI devices.

Linear pulse motors are a type of these linear motors, and in addition to being able to miniaturize the device and reduce the number of parts, the drive circuit is relatively simple because it is driven by pulses, so it is possible to use serial motors. It has begun to be used to feed the carriage of printers and the head of optical disc drives (hereinafter abbreviated as FDD).

Figure 2 shows a side view of a conventional linear pulse motor for a serial printer, and Figure 3 shows its front view. In the figure, a secondary magnetic circuit 40 is constructed by pasting a ferromagnetic scale (thin plate) 44 made of iron or the like onto a ferromagnetic substrate 42 made of iron or the like. A plurality of slits 46 are arranged at equal pitches in the scale 44, and these slits form the teeth of the secondary magnetic circuit 40. The slit 46 is formed, for example, by etching or by stacking the thin plates 44 in the depth direction. The secondary magnetic circuit 40 constitutes a stator in this embodiment.

48 is a primary side magnetic circuit that constitutes the mover, and has four m-poles 50a formed from a ferromagnetic material such as iron.

50b, 50C, 50d, and magnetic poles 50b, 5
The teeth 0c and 50d are respectively τ/2. They are arranged with a phase shift of τ/4.3τ/4. A coil 52 is wound around each of the magnetic poles 50a to 50d, and a permanent magnet 54 is provided above the coil 52. In addition, a ferromagnetic yoke 5 extends between two permanent magnets 54.
6 is provided. Reference numeral 58 denotes a frame made of a non-magnetic material such as stainless steel, and the primary side magnetic circuit assembly is attached to this frame. Two hole-through shafts 60 are fixed to the non-magnetic frame 58, and a gear gear support roller 62 is rotatably attached to the shafts 60. The row 562 comes into contact with the roller rolling surface 44a of the secondary side magnetic circuit 40 and supports the gap G. Furthermore, four shafts 64 are vertically fixed to the non-magnetic frame 58, and a row 566 is rotatably attached to the shafts 64. The roller 66 contacts the side surface of the secondary magnetic circuit 40 and guides the primary magnetic circuit 48 in a straight line.

In the conventional example shown in FIG. 2, each magnetic pole has 500 to 50
Two teeth are formed on each tip of d,
The number of teeth is not limited to this, and can be three or more.

- The teeth formed at the tips of each of the magnetic poles 50a to 50d of the next side magnetic circuit 48 are formed by laminating in the depth direction thin ferromagnetic plates whose tips are roughened by punching or etching. Although there is a certain degree of variation in the uneven dimensions of each thin plate formed by punching or etching, the positioning accuracy of a linear pulse motor is determined by the dimensional accuracy of the teeth formed by laminating the thin plates. Therefore, it is necessary to assemble a magnetic circuit with a uniform tooth arrangement by absorbing variations in the dimensional accuracy of each thin plate.

An example of the conventional I11 method for thin plates is shown in FIG.

Each magnetic pole 70a of a thin plate 70 formed from a ferromagnetic material such as iron
, 70b, 70c, , 70d are each formed with four teeth, and magnetic t4i70b, 70c.

The teeth of 70d are each τ/2 with respect to the teeth of magnetic pole 70a.
．． They are arranged with a phase shift of τ/4.3τ/4.

Holes 72a and 72b for aligning the thin plates are provided at both ends of the thin plate 70, and these holes 72 of the fa-layered thin plate 70
By driving pins 74a and 74b into holes a and 72b, the teeth of each thin plate 70 are aligned.

FIG. 5 shows another example of the conventional method of assembling a magnetic circuit. In this method, pressing jigs 78 and 80 are used to press the laminated thin plates 70 against an abutting jig 76 having two surfaces perpendicular to each other, thereby aligning the teeth.

In the conventional examples shown in FIGS. 4 and 5, the teeth are aligned by the method described above, and then adhesive is dripped between the thin plates to bond them together.

Problems to be Solved by the Invention However, in the conventional assembly method as shown in FIG.
If there is a gap between the teeth, the teeth tend to be misaligned. Furthermore, even when there is sufficient tightening allowance, when driving the pin into the hole, there is a problem that sag tends to occur on one side of the hole (the teeth tend to be irregularly aligned).

Furthermore, when the assembly method shown in FIG. 5 is adopted, the ends of the teeth are mechanically butted against the abutting jig 76 and stacked, so the one end that abutted is aligned, but the edges are There was a problem in that the teeth became uneven as the distance from the area increased. Further, when pressing against a thin plate having a high height, the abutment force of the jig 80 acts intensively, and there is a fear that the tips of the teeth of the thin plate may be crushed.

The present invention has been made in view of these points, and its purpose is to provide a method for assembling a linear pulse motor that allows the teeth of the laminated thin plates constituting the magnetic circuit to be uniformly aligned over the entire area. The goal is to provide the following.

Means for Solving the Problems According to the assembly method of the present invention, first, a plurality of round bars 16 having diameters equal to the tooth pitches of a plurality of secondary side magnetic circuits and a plurality of secondary side magnetic circuits are closely arranged on a plane. . A thin ferromagnetic plate 10 having concavities and convexities formed with the tooth pitch perpendicularly to the plurality of round bars 16 arranged in this way is brought into contact with the concave and convex portions, and a plurality of sheets are laminated in the direction of the round bars 16. The thin plates 10 thus laminated are finally fixed together.

As a means for bringing the teeth of the thin plate into contact with the round bar 16, it is preferable to use magnetic force generated by an electromagnet 24 provided behind the round bar 16, rather than mechanical force.

Function According to the assembly method of the present invention, a plurality of round bars 16 having a diameter equal to the tooth pitch of the negative magnetic circuit and the secondary magnetic circuit are closely arranged on a plane, and a plurality of round bars 16 formed on the thin plate 10 are arranged closely together on a plane. The thin plates are laminated by bringing the edges of the teeth into contact with the circumferences of these round bars. In this way, since the thin plates 10 are positioned by the round rods 16 at the positions of each tooth, rather than abutting only one end of the teeth, it is possible to stack thin plates with uniform teeth over the entire area of the teeth. Furthermore, even if the teeth of one thin plate 10 happen to be uneven, since it is constructed by laminating multiple thin plates, this unevenness will be evenly distributed over the entire area, and the average internal tooth after laminating the thin plates. Dimensional accuracy is outstanding.

Using the magnetic force of WEt1 stone 24, the thin plate 10 is turned into a round bar 1
6, there is no concentration of force on a specific thin plate unlike mechanical force, so deformation of the tooth tip hardly occurs.

EXAMPLE Hereinafter, an example of the assembly method of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, there is shown a perspective view showing an assembly method of an embodiment of the present invention, in which a thin plate 10 of a ferromagnetic material such as iron has four
magnetic poles 10a, 10b, 10c.

10d, and four teeth 12 are formed at the tip of each W1 pole. If the phase of the teeth 12 of the magnetic pole 10a is taken as a reference and the tooth pitch is τ, then the magnetic pole 10b
The phase of the teeth of magnetic pole 10C is τ/2, the phase of the teeth of magnetic pole 10C is τ/4,
Magnetic? The phase of the tooth 4!10d is formed to be 3τ/4.

Reference numeral 14 denotes a non-magnetic base made of stainless steel or the like, and a round bar 1 having a diameter equal to the tooth pitch τ of the thin plate 10.
4 grooves that can store 3 pieces of 6 in close contact 11, 13, 15
．． 17 is provided on its surface. Left end surface 1 of groove 11
1a is processed to match the phase of the teeth of the thin plate 10 and resemble chopsticks, and if! The left end surface 13a of No. 13, the left end surface 17a of the left end surface 15a1 of No. 15, and the left end surface 17a of groove 17 are each τ/2.
It is precisely machined with a phase shift of τ/4°3τ/4.

The other end faces of these grooves 11, 13, 15, 17 are machined so that the groove width is wider than the width of the three round bars 16 in order to take relief. The round bar 16 has 3 holes in these grooves.
They are placed in close contact with each other and fixed with adhesive 18. Further, an electromagnet 24 having a coil 22 wound around an iron core 20 is provided on the back side of the non-magnetic base 14.

Therefore, in order to assemble the primary side magnetic circuit of a linear pulse motor by laminating the thin plates 10, the edges of the teeth 12 of the thin plates 10 are brought into contact with the circumference of the round bar 16, and a plurality of thin plates 10 are stacked in the depth direction. The sheets are laminated and the electromagnet 24 is energized. As a result, the laminated thin plates 10 are moved to the round bar 1 by the magnetic force of the electromagnet 24.
6, a laminate of thin plates 10 with uniform teeth can be formed. By pressing the stack of thin plates 10 with aligned teeth from both sides and dripping adhesive between the respective thin plates, an integrated block of the stacked thin plates 10 can be obtained.

Instead of integrating with adhesive, laminated thin plates may be integrated by caulking. Note that the alignment of tooth traces can be further improved by applying a slight i-movement to the base 14 before integration using adhesive or caulking.

In the above-mentioned embodiments, the method of assembling the primary side magnetic circuit has been described, but the present invention is not limited thereto, and it goes without saying that it can be similarly applied to the method of assembling the secondary side magnetic circuit.

Effects of the Invention Since the assembly method of the present invention is configured as detailed above,
The tooth traces of the fallen thin plate are aligned over the entire area, and the positioning accuracy of the linear pulse motor is improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an assembly method of an embodiment of the present invention, Fig. 2 is a side view of a conventional linear pulse motor for a serial printer, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a conventional assembly method. FIG. 5 is a perspective view showing the method, and FIG. 5 is a front view showing another conventional assembly method. 10...Thin plate, 10a, 10b, 10c, 10d-...Magnetic pole 12...
Teeth, 14... Base made of non-magnetic material, 11.13
．． 15.17...Groove, 16...Round bar, 18...Adhesive, 20...
・Iron core, 22... Coil, 24... Electromagnet, 40... Secondary side magnetic circuit, 44... Thin plate (
scale), 46...slit, 48...-next side magnetic circuit. 1o: Angle 11 +4: ? . 16: Marunebetsu 24; Denshu 10,000 Invention Meihotun I Arrangement Ho and Bun 1 Remains Ho Slant View Figure 1 Figure 82/) L Motivation Figure 3 Conventional Iya Rough 10,000 Map 5 of the ward showing the pond

Claims (2)

[Claims] (1) Consisting of a primary magnetic circuit and a secondary magnetic circuit each having a plurality of teeth, the primary magnetic circuit or the secondary magnetic circuit is digitally driven step by step in a predetermined amount according to a pulse signal. In a linear pulse motor, a plurality of round bars (16) having a diameter equal to the tooth pitch of the primary magnetic circuit and the secondary magnetic circuit are closely arranged on a plane, and the round bars (16) are perpendicular to the plurality of round bars (16). A thin plate (10) of ferromagnetic material on which unevenness is formed with the tooth pitch is brought into contact with the uneven part, and a plurality of thin plates (10) of ferromagnetic material are laminated in the direction of the round bar, and the laminated thin plates (10) are fixed together. A method for assembling a linear pulse motor, characterized in that: (2) An electromagnet (24) is installed behind the round bars (16) arranged closely on a plane, and the magnetic force of the electromagnet (24) presses the laminated thin plates (10) onto the round bars (16). A method for assembling a linear pulse motor according to claim 1, characterized in that: