JPS5854871Y2 - Linear motor stop positioning mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mechanism for determining the stop position of a beam near motor.

Conventionally, in determining the stop position of a linear motor, a current in the opposite direction is applied to the moving body immediately before the predetermined stop position to perform reverse phase braking, and after decelerating to a certain extent, mechanical detent etc. However, with these methods, problems such as longevity due to wear of the detent mechanism for positioning, and noise problems occur. It has become.

In view of the above problems, the present invention aims to provide a mechanism that can determine the stop position without contact, without mechanically determining the stop position.For this purpose, the configuration of the present invention is linear. For a moving body of a linear motor, which is supported by a guide, is movable in a straight line along the guide, and is provided with magnetic pieces arranged in parallel in the direction of movement, a fixed excitation magnet having the same length as the length of the magnetic pieces in the direction of movement. It is characterized by having magnetic poles arranged at predetermined positions and facing each other in a non-contact manner.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention, a front view perpendicular to the direction of movement, and FIG. 2 a plan view.

A moving body 3 is equipped with a slide bearing 7 and a rolling bearing 7' that are movably fitted and placed along a linear guide 9, for example, a guide rod 6 and a guide rail 6' arranged in parallel, and supported by the guide. A secondary conductor 4 is attached below the primary stator 5 which is fixed for driving, and a secondary conductor 4 is attached to the side surface of the secondary conductor 4 facing the fixed excitation magnetic pole (electromagnet) 2. A magnetic piece 1 is integrally attached to the spaced apart part.

The moving body 3 has a guide rod 6. It is movable in any direction along the guide rail 6', and the movement of the movable body 3 is controlled by driving the secondary conductor 4 by the magnetic force generated when the coil of the primary stator 5 is energized.

In addition, a magnetic piece 1 is attached to the side surface of the moving body 3 along the moving direction, and an electromagnet 2 is fixed at a predetermined external position.
The lengths of the respective magnetic body parts are fixed so that they can face each other with the same length in the moving direction.

For example, the movable body 3 is driven by energization to the primary stator 5, moves in the direction of arrow C, and is subjected to deceleration drive control to stop at position A, or the energization is cut off.

At this time, assuming that the ends of the electromagnet 2 and the magnetic piece 1 are overlapping each other with a length of X facing each other, an attractive force is generated between the magnetic piece 1 and the electromagnet 2 by energizing the electromagnet 2.
The moving body 3 is moved from position A to position A' in the direction of arrow B and is positioned.

This means that a force proportional to the change in permeance acts on magnetic piece 1 and electromagnet 2 in the direction of increasing permeance, and the permeance tends to stabilize at the maximum point. The movable body 3 works in the direction in which the overlapping portion When they match, they become stable and positioned at position A'.

In other words, it is stopped. Incidentally, the suction force F at that time is expressed by equation 1-1.

As described above, according to the present invention, regarding a linear motor, an electromagnet is mounted on the fixed part, a magnetic piece having the same length as the magnetic pole of the electromagnet in the moving direction of the linear motor is mounted on the movable part, and these pieces are mounted in the moving direction. However, the positional relationship is set so that they overlap in parallel and without contact, and the attractive force between the magnetic piece and the electromagnet eliminates the negative effect on moving parts, etc. that is conventional, and reduces the damage caused by wear of the positioning mechanism. It shows remarkable practical effects in that it solves the problem of life expectancy, and also achieves noise reduction because it is non-contact, and allows the movable part to be stopped and positioned at the magnetic pole position.

It should be noted that the same effect is obtained regardless of the moving direction of the moving body, and of course, if the electromagnet is not energized and excited, it does not have the stop positioning and fixing function.

In addition, by making the position of the electromagnet arbitrarily movable and setting it to a desired stopping position, a predetermined stopping position can be determined, and by arranging multiple electromagnets in combination, a variety of stopping controls are possible. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a stop positioning mechanism for a linear motor according to the present invention as viewed from a plane perpendicular to the moving direction, and FIG. 2 is a plan view of FIG. 1. In the figure, 1 is a magnetic piece, 2 is an electromagnet, 3 is a moving body, 4 is a secondary conductor, 5 is a primary stator, 6 is a guide rod, 6' is a guide rail, 7 is a slide bearing, and 7' is a rolling bearing. be.

Claims (1)

[Scope of utility model registration request] For a moving body of a linear motor that is supported by a linear guide, is movable linearly along the guide, and is provided with magnetic pieces arranged in parallel in the direction of movement, it is possible to fix the same length as the length of the magnetic pieces in the direction of movement. A stop positioning mechanism for a linear motor, characterized in that excitation magnetic poles are arranged oppositely at predetermined positions without contact.