JPS61273167A - Flat plate-shaped linear pulse motor - Google Patents

Abstract

PURPOSE:To reduce the thickness, the size, the weight and the cost by composing a linear pulse motor by opposing a flat plate-shaped stator and a movable element through a magnetic gap. CONSTITUTION:A linear pulse motor is composed of a flat plate-shaped stator 1, and a flat plate-shaped movable element 5 opposed with the stator 1 through the prescribed magnetic gap. The stator 1 has a rod-shaped permanent magnet 2 of square-section having N- and S-poles on both sides of longitudinal direction for supplying a bias magnetic flux, a pair of U-shaped magnetic cores 3a, 3b on which coils 32a, 32b are wound in a central recess 31, secured oppositely to the both poles of the magnet 2, and a pole plate 4 bridged between the cores 3a and 3b. Pole teeth group 51 is arranged oppositely to the plate 4 of the stator 1 on the element 5.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a linear pulse motor applied to, for example, a floppy head drive of a word processor.

<Summary of the Invention> The present invention is characterized in that U-shaped magnetic cores each having a coil wound around the center thereof are fixed to opposite sides of a square bar-shaped permanent magnet, and each fixed portion of the permanent magnet and the magnetic core is fixed. A linear pulse motor is operated by a stator having a four-phase magnetic pole tooth group, and a plate-shaped mover that is arranged opposite to the stator through a predetermined magnetic gap and has a magnetic pole tooth group having the same pitch as the stator. This makes it possible to reduce the thickness, size, and cost of a linear pulse motor.

<Prior Art> Conventionally, cylindrical linear pulse motors have been used in word processor floppy head drives and the like. As shown in FIG. 4, the linear pulse motor includes a guide shaft 62 disposed in the 6th part of the cylinder of a cylindrical stator 6 having magnetic pole teeth 61 on the inner surface, and a bearing 71 and a bearing bushing 72 attached to the guide shaft 62. A structure in which the slider 7 is slidably mounted on a shaft has been proposed (Utility Model Application No. 58-97759). In such a conventional linear pulse smoke, the guide shaft 62 of the stator, the bearing 71 and the bearing bush 72 of the slider increase the outer diameter of the motor, and the stator 6 and the slider 7
The magnetic pole teeth are all formed by cutting with a cutting tool, resulting in poor productivity and contributing to increased costs.

<Purpose of the Invention> The present invention is a novel motor that can realize thinness, size, weight, and cost reduction by configuring a linear pulse motor by arranging a flat stator and a moving element to face each other via a magnetic gap. The purpose of the present invention is to provide a flat linear pulse motor.

<Structure and Effects of the Invention> In order to achieve the above object, in this invention, N is provided on both sides.
,S A pair of U-shaped magnetic cores with a coil wound around the center are fixed facing each other to a straight permanent magnet with different magnetic poles,
A stator having a four-phase magnetic pole tooth group on each fixed part of a permanent magnet and a core, and a flat plate-shaped mover having a corresponding magnetic pole tooth group of the same pitch as the stator. A linear pulse motor is constructed. According to the above configuration, in the present invention, since both the stator and the mover are made into flat plate shapes, the linear pulse motor can be made thinner and more compact.In particular, the magnetic pole teeth can be formed by etching or pressing. Since it can be formed easily, it improves accuracy and productivity, and is effective in reducing costs.

However, since the four-phase magnetic pole tooth group on the stator side can be integrally formed via a narrow bridge, the pitch between the phases can be set with high precision, and practical effects such as stable feeding accuracy can be achieved. play.

<Description of Embodiments> FIG. 1 shows an assembly situation of a flat linear pulse motor according to the present invention.

The linear pulse motor is composed of a flat stator 1 and a flat moving element 5 disposed opposite to the stator 1 with a predetermined magnetic gap therebetween.

The stator 1 includes a rod-shaped permanent magnet 2 having a square axial cross section and having magnetic poles of N and S different polarities on both sides in the longitudinal direction and supplying bias magnetic flux, and is fixed opposite to both magnetic poles of the permanent magnet 2. A pair of U-shaped magnetic cores 3a, 3b with coils 32a, 32b wound around a central recess 31°31, and both magnetic cores 3a.
.

It consists of a magnetic pole plate 4 arranged at the crotch joint between 3b and 3b.

The magnetic pole plate 4 has a hole 4 in the center corresponding to the permanent magnet 2.
1, and is fixed on both magnetic cores 3a and 3b with the punch hole 41 aligned with the permanent magnet 2. On the upper surface of the magnetic pole plate 4, there is a fixed part 2 of the permanent magnet 2 and both magnetic cores 3a and 3b.
Predetermined pitches P corresponding to 1, 22° and 23.24, respectively.
4-phase magnetic pole tooth groups 42 a, 42 b, 4
2 c.

42d are arranged in a row, and PI3 is provided between the magnetic pole tooth groups 42a and 42b.
, between the magnetic pole tooth groups 42c and 42d is PI3, and the magnetic pole tooth group 42a
, 42d, a phase shift of PI4 is set, and narrow bridge portions 43, 43, 44, 44 are provided between the magnetic pole tooth groups of each phase.
It is integrally composed of.

The flat plate-shaped mover 5 has a plate facing the magnetic pole plate 4 of the stator 1.
A group of magnetic pole teeth 51 having a pitch equal to the pitch P of the magnetic pole tooth group is arranged in a row, and the mover 5 is arranged so as to be slidable in the direction of arrow A with respect to the stator 1 via a linear bearing (not shown). , a magnetic gap of about 50 μm is set between the stator 1 and the mover 5.

Next, the operation of the linear pulse motor according to the present invention will be explained based on FIGS. In FIG. 3 a w d, reference numeral 25 indicates the flow of magnetic flux by the permanent magnet 2, and 33 indicates the exciting coil 32a.

32b shows the flow of magnetic flux generated by 32b.

In FIG. 3(a), the bias magnetic flux 25 generated by the permanent magnet 2 comes out from the north pole, passes through the magnetic gap, the magnetic pole teeth group 51 of the mover 5, passes through the magnetic gap again, and reaches the south pole.

Here, when a current i is passed through the coil 32a as shown in the figure, a magnetic flux 33 shown by a broken line is generated, and the magnetic flux 33 is generated by the magnetic pole tooth group 42b.
The magnetic flux 33 of the permanent magnet 2 is generated in the direction of weakening in the portion , and in the direction of strengthening in the portion of the magnetic pole tooth group 42a.

Therefore, the mover 5 is restrained at a position where the peak of the magnetic pole tooth group 51 and the peak of the magnetic pole tooth group 42a of the stator 1 are opposed to each other.

Next, as shown in FIG. 3(b), when a current i is passed through the coil 32b, the magnetic flux 33 weakens each other in the magnetic pole tooth group 42b, and the magnetic flux 33 weakens each other in the magnetic pole tooth group 42b.
2c, the moving element 5 is restrained such that the peaks of the magnetic pole tooth group 51 and the peaks of the magnetic pole tooth group 42c are opposed to each other.

Here, since the magnetic pole tooth groups 42a and 42c are set to have a phase shift of P/4, the slider 5 moves by P/4 between FIG. 3(a) and FIG. 3(b). It turns out.

The magnetic pole plate 4 of the stator 1 has narrow bridge portions 43, 43, 44.
44, the magnetic pole tooth groups 42a to 42d are connected to each other, so that the permanent magnet 2, the coil 32a,
Magnetic flux 25° 33 due to 32b flows, but because of the narrow width, the bridge portion becomes saturated and becomes a large magnetic resistance. Therefore, most of the magnetic flux flows to the moving element 5 through the magnetic gap and contributes to the thrust force.

The present invention has the above-mentioned configuration, so that highly productive processing methods such as pressing or etching can be used for the magnetic pole plate 4, and since the four-phase magnetic pole tooth groups 42a to 42d are integrated, assembly work is simplified and high precision is achieved. can get. Moreover, stator 1, mover 5
Since both have a flat plate shape, the invention has the effect of achieving the purpose of the invention, such as making the linear pulse motor thinner and smaller.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a flat linear pulse motor according to the present invention in an assembled state, FIG. 2 is a perspective view of a flat stator, and FIG.
Figures (a) to (d) are diagrams for explaining the operation, and Figure 4 is a sectional view of a conventional linear pulse smoke. 1... Flat stator 2... Permanent magnets 21 to 24... Fixed parts 3a, 3b.
... Core 4 ... Magnetic pole plate 42a-4
2d... Magnetic pole tooth group 43, 44... Bridge portion 5... Mover 51... Magnetic pole tooth group 4/B 4Q'agK-'F. Lalinia 80 Rusmoke → h figure ヰ2 figure
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94) Cubic Electric Co., Ltd. Representative: Takao Tateishi 4, Agent address: 1-21-22-5, Shimanouchi, Minami-ku, Osaka 542
Column 6 of the detailed description of the invention in the drawings to be amended and the specification, contents of the amendment (1) Figure 1 of the barrel 1 of the drawings submitted at the same time” - Amendment. (2) Change “Magnetic flux 33” to “Magnetic flux 25” on page 6, line 18 of the specification tube.
” was corrected. (3) On page 7, line 4 of the specification, "magnetic pole tooth group 42b" is corrected to "magnetic pole tooth group 42d".

Claims (2)

[Claims] (1) A permanent magnet with N and S different magnetisms on both sides along the longitudinal direction, a pair of U-shaped magnetic cores fixed opposite to both magnetic poles of the permanent magnet and with a coil wound around the center, both magnetic a stator having a group of magnetic pole teeth for four phases arranged correspondingly on the fixed portion of the core and the permanent magnet and shifted in phase by a predetermined pitch; A flat linear pulse motor consisting of a stator and a mover having magnetic pole teeth of the same pitch. (2) The flat linear pulse motor according to claim 1, wherein the four-phase magnetic pole teeth groups are integrally connected by a narrow bridge portion.