JPS59113762A - Arcuate motor - Google Patents

Abstract

PURPOSE:To simplify the shape of a movable bobbin by constructing to provided a thrust of arcuate motion by a magnetic field of a direction perpendicular to the plane of the motion. CONSTITUTION:A coil 11 which flows a current is wind on a movable bobbin 10. The bobbin 10 is secured to a rotary arm 13 via bolts 12, and journaled via a shaft 14. Permanent magnets 18a, 18b of flat plate shape and yokes 15, 16, 17 for forming a magnetic circuit are disposed in parallel with the rotary plane of an arcuate motion. A motor is used to operate an arcuate motion by controlling the direction and amplitude of a current flowed to the coil 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a moving coil type circular arc motor as a drive source that reciprocates on a circular arc.

Structure of the conventional example and its problems As shown in FIG. 1, a specific example of the conventional circular arc motor has a curved movable bobbin 3 fixed to a swinging arm 2 that is pivotally supported on a swinging shaft 1. ing. A coil 4 is wound around the movable bobbin 3, and a permanent magnet 5 forms a magnetic circuit. outer yoke 6
, the inner yoke 7 had a curved shape to match the movable coil 4. However, in the above configuration,
Since many of the parts are curved, it is difficult to process and assemble the parts, resulting in problems in assembly accuracy and high costs.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and simplifies the overall configuration as well as the individual parts.

Structure of the Invention The present invention provides a magnetic field in a direction perpendicular to the plane of rotation of circular arc motion.
By passing current through the coil, thrust in the direction of rotation can be obtained. ), and the shapes of the parts for forming the magnetic circuit and the moving coil section are simplified, which is extremely advantageous in terms of parts processing and also simplifies the construction.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on FIGS. 2 and 3. In FIGS. 2 and 3, reference numeral 10 denotes a movable bobbin, around which a coil 11 through which current flows is wound.

The movable bobbin 10 is fixed to a rotating arm 13 with a bolt 12 and is supported by a shaft 14.

15, 16, and 17 are an inner yoke, a side yoke, and an outer yoke for forming a magnetic circuit, respectively.

181L and 18b are permanent magnets for the magnetic circuit and 18a
and 181) are magnetized in the directions of arrows A2 and B in FIG. 3, respectively. Is that all? ) configuration, coil 1
By controlling the direction and thickness of the current flowing through the motor, it can be used as a motor for circular motion.

As described above, according to this embodiment, the shape of the movable part bobbin is simplified by arranging the flat permanent magnet and the yoke for forming the magnetic circuit parallel to the plane of rotation of the circular motion. Therefore, it is possible to easily wind the coil and form a motor that performs circular motion by configuring parts that are easy to process.In addition, in this embodiment, the inner yoke 15 is circularly shaped, but the movable bobbin 10 is If the inner diameter l is made sufficiently larger than the outer diameter m of the inner yoke 15, the inner yoke 15 does not necessarily have to be an arc, but may be rectangular like the outer yoke 17.

/! Further, in this embodiment, the permanent magnets 182L and 18b are rectangular, but the permanent magnets 18J and 18b may be arcuate like the inner yoke 15.

Effects of the Invention As described above, the present invention has a configuration in which the thrust of the circular motion is obtained by a magnetic field in a direction perpendicular to the plane of the circular motion. By making the yoke for the magnetic circuit into a shape similar to that of a so-called linear motor that moves in a straight line instead of using an arc-shaped part that is difficult to process, the overall configuration of the arc motor is simplified, making it more practical. The effect is very strong.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional circular arc motor, FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 3 is a sectional view taken along line X--X in FIG. 1o...Movable bobbin, 11...Movable coil, 15...Inner yoke, 16...Side yoke, 17...Outer yoke, 18a, 18b
······permanent magnet. 1rlII Figure 2 Figure 3 18 North/7

Claims (1)

[Claims] A movable coil part that can move in an arc shape and is wound parallel to the normal line of the arc, a permanent magnet arranged to form a magnetic field in a direction perpendicular to the plane of the arc movement, and a permanent magnet for forming the magnetic field. An arc motor consisting of a yoke as a magnetic circuit.