JPH01110050A - Miniature linear pulse motor - Google Patents

Abstract

PURPOSE:To enhance a propulsive force by inserting one side of a first guide section between hard balls and L-shape of the second guide section and making a fine adjustment of a adjust screw of the second guide section. CONSTITUTION:A miniature linear pulse motor is such that there is the first teeth 2 on one end of plane side of an upper yoke 1 and that there is a coil insertion shaft 3 on the other end. The coil insertion shaft 3 is inserted into an excitation coil 4, and a permanent magnet 6 is mounted on the central part of a lower yoke 5. The second teeth 8 opposed to the first teeth 2 are formed on a movable piece 7, and a plurality of swivelling hard balls 10 are provided to a retainer 9 to support the bottom and side of the piece 7. The first - second guide sections 11-12 are fixed together to the lower yoke 5. In addition, one side of L-shape of the second guide section 13 is fixed to the lower yoke 5 as well. One side of the first guide section 14 is placed between a adjust screw 15 mounted on said guide section 13 and an lateral hard ball 10. Accordingly, lateral backlash of the piece 7 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small linear pulse motor, and more particularly, to a small FFI linear pulse motor for linearly moving a disk drive, etc.

[Conventional technology]

There is an upper yoke made of a magnetic material having first teeth on a flat surface at one end and a coil insertion shaft at the other end, and an excitation coil is wound around the coil shaft of this upper yoke.

The other end of the coil shaft of the upper yoke is inserted and fixed into the lower yoke made of magnetic material. Further, there is a slider made of a magnetic material having second teeth opposite to the first teeth, and this slider is supported by a plurality of rotatable hard balls from the bottom and side surfaces. The first one from both sides of these hard balls. (supported via a second guide).

In order to eliminate the lateral "heaviness" of the slider, one of the first guides (for side support) has a spring force, and this spring force eliminates the aforementioned "heaviness". That is,
General machine tools produce a machining accuracy of several 10 μm, but this accuracy cannot be used as a pulse sensor. For this purpose, spring force was used to absorb the ``kashi''.

[Problem that the invention seeks to solve]

In the conventional pulse motor mentioned above, the spring force of the guide is used via the hard ball of the slider E in order to remove the lateral "heaviness" when the slider advances, but the adjustment of this spring force is extremely difficult. It's difficult. That is, if the spring force is too large, the propulsive force of the slider decreases, and if the spring force is too small, the slider may cause a meandering motion, which makes it impossible to slide uniformly.

[Means for solving problems]

The small linear pulse motor of the present invention includes a plurality of flat plate members having first teeth on their planes, each of which is made of a magnetic material that supports the individual coil insertion shafts and is integrally coupled with the upper yoke. a lower yoke consisting of a lower yoke, a mover made of a magnetic material having second teeth opposing the first teeth on one surface, an excitation coil wound around the coil insertion shaft, and a bottom and side surfaces of the mover. A small linear pulse comprising a retainer having a plurality of rotatable hard balls to support, and a first guide part and a second guide part which are coupled to the lower yoke and support the mover from the bottom and side surfaces via the hard balls. In the motor, the one second guide part is L-shaped without a T, the one GT guide part is inserted between the side surface hard ball and the L-shaped second guide part, and the L-shaped second guide part is provided. It is characterized in that the one first guide part is adjusted in the lateral direction by an adjustment screw.

[Effect]

In the small linear pulse motor of the present invention, one first guide part is inserted between the hard ball and the L-shaped second guide part, and the L-shaped second guide part is inserted between the hard ball and the L-shaped second guide part.
By finely adjusting the adjustment screw provided on the guide part, it is possible to slide the slider in the lateral direction with high accuracy. Furthermore, since the adjustment screw can be operated minutely, it is dangerous to have an adverse effect on the propulsion force.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front cross-sectional view showing one embodiment of the shed linear pulse motor of the present invention, and FIG. 2 is an exploded perspective view of the whole.

In FIGS. 1 and 2, the upper yoke 1 has first teeth 2 on the plane side of one end, and has a coil insertion shaft 3 on the other end side. Excitation coil 4K.

; Insert the tile insertion shaft 3t. The lower yoke 5 is provided with a permanent magnet 6 at its center, and the excitation coil 4 is inserted and fixed at a desired position on the nine coil insertion shafts 3t. The mover 7 is formed with second teeth 8 that are opposed to the first teeth 2 . The retainer 9 includes a plurality of rotatable hard balls 1G, and the mover 7
supports the bottom and sides of the First guide part 11. Second
Both guide parts 12 are attached to the lower part 1-5. One L-shaped second guide portion 13 is similarly attached to the lower yoke 5. One of the first guide parts 14 is located between the adjustment screw 15 attached to the L-shaped second guide part 13 and the hard ball lO in the lateral direction. That is, the first guide parts 11 and 14 support the side surface of the mover 7 via the hard ball lO. On the other hand, the second guide part 12 and the L-shaped second
Both guide portions 13 support the bottom surface of the mover 7 via hard balls 10.

Note that during assembly, the gap between the first tooth 2 and the second tooth 8 is 20 to 30 μm, which can be ensured by assembling accuracy. Since the first teeth 2 and the second teeth 8 are attracted to each other by magnetic force, they do not easily come off, and there is no need to take measures to prevent them from coming off. However, since there is no restriction in the lateral direction of the mover 7, a restriction is required to ensure high accuracy, which can be handled by the adjustment screw 15 of the present invention.

〔Effect of the invention〕

The linear pulse motor according to the present invention has the same effect as a "razor" provided in the foot grooves of the X and Y sliders, and by finely adjusting the adjustment screw 15, the lateral "backlash" of the slider can be adjusted between all the slides. Since it can be adjusted within 2 to 3 μm, it has the effect of significantly improving the operating characteristics of the linear pulse motor.
It is possible to make the side sub-micron, but the slide would be hard and the propulsive force would be large. Therefore, it is possible to maintain lateral precision and smooth sliding t-m by simple adjustment of the adjusting screw.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of a small linear pulse motor of the present invention, and FIG. 2 is an overall exploded view from fi+. l... Upper yoke, 2... First tooth,
3... Coil axis, 4... Exciting coil,
5...Lower yoke, 6...Permanent magnet,
7...Mover, 8...Second tooth, 9.
...Retainer, 10...Hard ball, ll...
...First guide part, 12...°Second guide part, 13...L-shaped second guide part, 14-...
...One first guide part, 15...adjustment screw. Figure 1 Figure 2

Claims (1)

[Claims] an upper yoke made of a magnetic material in which coil insertion shafts are provided on a plurality of flat plate members having first teeth on their planes; and a permanent magnet is provided in the center to support the individual coil insertion shafts and are integrally coupled with the upper yoke. a lower yoke made of a magnetic material, a mover made of a magnetic material having second teeth opposing the first teeth on one surface, an excitation coil wound around the coil insertion shaft, and the mover. a retainer including a plurality of rotatable hard balls that support a bottom surface and side surfaces, and a first guide section and a second guide section that are coupled to the lower yoke and support the mover from the bottom surface and side surfaces via the hard balls. In the small linear pulse motor, the one second guide part is L-shaped, the one first guide part is inserted between the side surface hard ball and the L-shaped second guide part, and the second L-shaped A small linear pulse motor characterized in that the one first guide part is adjusted in the lateral direction by an adjustment screw provided on the guide part.