JPS6395849A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To make the title linear pulse motor thin and highly accurate, by a method wherein permanent magnet pieces are bonded to the surface of a pole shoe, which is opposed to the teeth of a stator, to generate bias flux. CONSTITUTION:A stator 3 is constituted by a multitude of teeth 1, provided at the central part orthogonally to the advancing direction of a movable piece 13, and guide ways 2, guiding bearings or the like which support the movable piece 13 and provided at both sides of the title motor. The movable piece 13 is constituted by a pair of pole shoes 5, provided with the thin sheets of permanent magnet piece 4 which are opposed to the teeth 1, a pair of pole shoes 6 of solid strong magnetic body and a pair of driving units 11, in which coils 10, 12 are wound concentratedly around yokes 9. The driving units 11 on both sides are formed so that the pitch thereof is deviated by the half of the width of the permanent magnet piece 4. According to this method, the amount of flux of the driving unit 11 is increased by the bias flux of the thin permanent magnet pieces 4 and exciting ampareturn is reduced whereby the title linear pulse motor may be made highly accurate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulse motor for driving OA (office automation) equipment, and more particularly to a planar pulse motor.

[Conventional technology]

Conventionally, as an example of this type of device, there is a linear stepping motor used for moving the head of a floppy disk device, for example, as disclosed in Japanese Patent Laid-Open No. 13465/1983.

This conventional example includes a stator core held on a base with its teeth exposed, a mover to be placed facing the base, and teeth of the stator core stored in this mover. In the linear stepping motor, the driving coil is wound around the coil winding portion of the winding core, which has the stator core support portion and the coil winding portion. In this linear stepping motor, the winding core is fixed to the stator core such that the coil winding portion is on the side of the stator core and substantially parallel to the moving direction of the mover.

[Problem that the invention seeks to solve]

However, in such a conventional example, it is necessary to cut gears so that the thrust generating part is formed from both sides, that is, the teeth of the stator core and the slider piece that has teeth opposite thereto. However, it required complicated processing and was expensive.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome the drawbacks of the prior art and to provide a linear pulse motor that can be made into a permanent magnet type and thin and has high precision.

[Means for solving problems]

In the present invention, a strong permanent magnet piece made of a narrow thin plate is attached to a pole shoe on the surface facing the teeth of the stator to generate a bias magnetic flux, and a driving side magnetic pole is formed as a thrust generating part, and a magnetic flux is returned. The pole shoes are arranged to face guideways for guide bearings provided on both sides of a ferromagnetic stator integrally formed with the teeth, and the pole shoes facing the tooth surfaces and the pole shoes facing the guideway are connected in a spiral shape by a yoke. Two sets of drive parts are provided with concentrated winding single-phase excitation coils in the middle of the drive part, and the magnetic poles of each drive part are shifted by 172 pitches relative to each other, and each phase coil is alternately excited to generate thrust. This is a linear pulse motor that generates (thrust) and moves the mover in small pitch increments.

[For production]

The magnetic flux of the electromagnetic pole of the drive unit facing the stator teeth is increased by the bias magnetic flux of the thin permanent magnet, and the excitation ampere turn is reduced.

〔Example〕

A perspective view of an embodiment of the present invention is shown in FIG.

FIG. 2 is a diagram showing the arrangement relationship between stator teeth and mover permanent magnets.

Bearings (not shown) etc. are provided in the center of the stator 3 at a large number of narrow equal pitches 202 widths Wt perpendicular to the moving direction of the movable element 13, and support the movable element 13 on both sides. l1 of the stator 3 provided with a guideway 2゜2 for guiding the
On the surface facing f11, there is a width W on the opposite surface through a gap.
The thin plate permanent magnet pieces 4 are formed into a plurality of adjacent pole pairs with alternating polarities, and are placed parallel to the teeth 1 to attach the pole shoe A-
Pole shoes B and 6 made of solid ferromagnetic material are placed on the surface facing the guideway 2 with an air gap in between, and one end of pole shoe A and B and pole shoe B and 6 are each attached to a magnet. The coils A and 10 are connected by a yoke 9 so as to form a path, formed into a spiral shape, and the coils A and 10 are concentratedly wound around the yoke 9.
When the coil 10 is excited, yoke 9 → ball show A・5 → permanent magnet piece 4 - tooth 1 →
A driving section 11 is formed in which magnetic flux flows in the following order: stator 3 - guideway 2 -> ball show B/6 -> yoke 9.

Another driving section 11 is provided, which is formed in the same manner as the driving section 11 described above, with a pole shoe 0.7, a pole shoe D.8, a permanent magnet piece 4, a yoke 9, and a coil B.12.

The driving parts 11 on both sides were arranged parallel to each other so that the pitch was shifted by half the width WP/2 of each permanent magnet piece 4 in the traveling direction, and each was fixed to the movable table shown by the dotted line and provided on the movable table. The teeth 1, the permanent magnet piece 4, the guideway 2 and the pole shoe B/6. Coils D and 8 are arranged so as to face each other with a gap in between, and coil A
・When 10 and coil B 12 are alternately excited, mover 13
advances by W/2.

FIG. 2 shows a back view of the movable element 13 facing the stator 3 and a side view of the stator 3 facing the movable element 13.

3 and 4 are plan views of main parts of other embodiments of the present invention,
FIG. 2 is an explanatory diagram of the opposing portions of the movable element and the stator seen from the side.

Note that the same components are given the same reference numerals.

In this other embodiment, the pole shoe A.5 and the pole shoe C.7 are arranged in series on the tooth 1, and the pitch of the tooth 1 is P.
t, set the width of the permanent magnets attached to pole shoe A-5 and pole shoe C-7 by half a pitch [(1/2
) ・W ] It is shifted.

As a result, the tooth width Wt can be made smaller and generation of yawing moment of the movable element 13 can be prevented compared to the parallel arrangement.

In addition, as another embodiment of the present invention, FIG.
A machine with the stator and mover in the figure reversed can be considered.

In this case, there is no need to supply excitation current to the mover.

〔Effect of the invention〕

Thus, according to the present invention, the following many remarkable effects can be obtained, and an ideal machine as a thin linear pulse motor can be realized.

■ The driving side magnetic pole can be formed with a narrow thin plate permanent magnet that also serves as a bias magnet, so there is no need to cut gears on the moving part. ■ The driving side magnetic path can be formed with a breathwork of a thin ferromagnetic plate, reducing costs. Cheap, ■ The amount of magnetic flux of the magnetic poles of the driving part facing the stator teeth is increased by the bias magnetic flux of the permanent magnet, so the excitation ampere turns are small and efficiency is high. ■ Therefore, the machine size is small. ■ Narrow thin plate permanent magnets are made up of two phases, and by batch magnetization, the phase difference and magnetic pole pitch for the two phases can be accurately formed. It can be done at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a plan view showing the arrangement relationship between teeth and magnetic poles, Fig. 3 is a top view showing another embodiment of the invention, and Fig. 4 is a FIG. 3 is a side view showing the arrangement relationship between the teeth and magnetic poles. 1... Teeth, 2... Guideway, 3... Stator,
4... Permanent magnet piece, 5, 6, 7.8... Pole shoe, 9... Yoke, 10.12... Coil, 11.
... Drive unit, 13... Mover. Applicant's agent Mr. Sato Figure 2

Claims (1)

[Claims] 1. In a linear pulse motor in which a primary magnetic pole whose gears are cut at an equal pitch and a secondary magnetic pole having an excitation coil are opposed to each other with an air gap interposed therebetween, in the central part, etc. A stator is provided with pitch-cut teeth and forms a primary side with flat guide portions on both sides, and a thin permanent magnet piece made of a thin plate is pasted on the surface facing the teeth of the primary side. and two sets of secondary drive units each having a pole shoe formed with a magnetic pole and a pole shoe facing the surface facing the guide part spirally connected by a yoke, and a concentrated winding coil provided on the yoke, and each drive unit. A linear pulse motor comprising: a movable element fixed to each other with a pole pitch shifted by 1/2 a tooth pitch of a fixed part; 2. The linear pulse motor according to claim 1, wherein the magnetic poles of the secondary drive section are arranged in parallel. 3. The linear pulse motor according to claim 1, wherein the magnetic poles of the secondary drive section are arranged in series.