JPS5943821Y2 - Moving coil arc motor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a moving coil type circular arc motor, and more particularly, to a moving coil type circular arc motor for swinging and driving an object to be driven.

A movable, one-wheel type circular arc motor includes a swinging arm that can rotate around one axis, and an arc-shaped cylindrical bobbin that is provided on one side of an extension of the swinging arm and has an arc-shaped cylindrical bobbin centered on the axis. and a movable element including a coil wound around the cylindrical bobbin, and a stator that engages with the inner circumference and outer circumference of the cylindrical bobbin at intervals and includes a field magnet. Moving coil arc motors are known.

In the above-mentioned moving coil arc motor, the degree to which the magnetomotive force of the coil of the mover substantially affects the field magnetic flux of the stator is determined by the rotation angle of the mover with respect to the stator and its rotation force. Therefore, there is a problem that the output torque changes depending on the rotation angle and direction of the rotation force.

In view of the above-mentioned problems with conventional moving coil arc motors, the present invention has been developed to improve the motor so that it always generates a nearly constant output torque regardless of the rotation angle and direction of rotation of the mover relative to the stator. The purpose of the present invention is to provide a moving coil type circular arc motor.

This purpose, according to the present invention, includes a swinging arm that is rotatable around one axis, and an arc-shaped cylinder that is provided symmetrically on both sides of the extension of this swinging arm and that is centered on the axis. a movable element including a coil wound around each of the cylindrical bobbins, and an iron core and a field magnet fitted to the inner and outer peripheries of each of the cylindrical bobbins at intervals. This is accomplished by a moving coil arc motor, such as one having a stator.

According to the above-mentioned configuration, since the coil and the field magnet are provided symmetrically on both sides of the extension line of the swing arm, the total output torque is the output of the two coil-field magnet pairs. Therefore, the total output torque is always constant regardless of the rotation angle or rotation direction of the mover relative to the stator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a moving coil type circular arc motor according to the present invention.

In the figure, reference numeral 1 indicates a movable element, and the movable element 1 includes a swing arm 3 that is pivotally supported at one end by a shaft 2 and is rotatable about the shaft 2.

At the other end of the swing arm 3, arc-shaped cylindrical bobbins 4.5 are provided symmetrically to each other with the shaft 2 as the center on both sides of the extension line thereof.

Each of the cylindrical bobbins 4.5 has a rectangular or circular cross-sectional shape, and a conductive wire 6.7 is spirally wound around the outer periphery thereof, and a coil 8.9 is wound thereon. There is.

Reference numerals 10 and 11 each indicate a stator.

The stators 10 and 11 are fixedly arranged symmetrically to each other on both sides of the extension line of the swing arm 3 in the neutral position as shown.

The stators 10 and 11 each include an arc-shaped cylindrical outer core 12, 13 centered on the shaft 2, and a rod-shaped inner core 12,13. 4
．． 15 and the external iron core? 2.13 and the internal core 14
．． 15 respectively at one end thereof to each other, and an end core 16,17 for connecting the outer cores 12.
13 has permanent magnets 18 and 19 for field.

The outer cores 12.13 are fitted to the outer circumference of the bobbin 4.5 with a predetermined relatively small interval, and the inner cores 14.15 are respectively fitted to the inner circumference of the bobbin 4.5. FIG. 2 is a graph showing the relationship between the rotation angle θ of the movable element 1 with respect to the stator 11 and the total output torque.

In this graph, the symbol A is the output torque of the coil 9 and stator 11 when the mover 1 rotates clockwise around the axis 2 as seen in FIG. The output torque by the coil 8 and the stator 10 when rotating around the shaft 20 in the counterclockwise direction as seen in FIG. The output torque of the coil IL/8 and the stator 10 when the coil IL/8 rotates clockwise, or the output torque of the coil 9 when the movable element 1 rotates counterclockwise around the axis 2 as seen in FIG. and shows the output torque by the stator 11.

Further, the symbol C indicates the total output torque of the moving coil type circular arc motor according to the present invention having the above-described configuration.

This total output torque is the sum of the output torque indicated by symbol A and the output torque indicated by symbol B, and as is clear from this graph, this total output torque is the sum of the output torque indicated by symbol A and the output torque indicated by symbol B. It is always constant regardless of the rotation angle and rotation direction.

FIG. 3 is a perspective view showing an example of a case where a moving coil type circular arc motor according to the present invention is used as a driving object, such as a reflecting mirror in an optical device.

Regarding the moving coil type circular arc motor, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG.

The shaft 2 is supported by a support member 20 so as to be rotatable around its axis.

The shaft 2 supports a reflecting mirror 22, which is an object to be driven, via a mounting member 21.

By applying a predetermined current to the coil 8.9, the movable element 1 rotates clockwise or counterclockwise about the shaft 2 relative to the stators 10 and 11, and the shaft 2 accordingly rotates. By moving, the direction of the reflecting surface of the reflecting mirror 22 changes.

In this case, since the output torque of the moving coil type circular arc motor is always constant, the reflecting mirror 22 is held at a constant output torque regardless of the rotating position, and rotates stably.

Although the present invention has been described above in detail with reference to specific embodiments, it is clear to those skilled in the art that the present invention is not limited to this and that various embodiments are possible within the scope of the present invention. Will.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing one embodiment of the moving coil type circular arc motor according to the present invention, Fig. 2 is a characteristic diagram showing the output characteristics of the moving coil type circular arc motor according to the present invention, and Fig. 3 is a moving coil type circular arc motor according to the present invention. FIG. 3 is a perspective view showing an example of how an arc motor is used. 1... Mover, 2... Axis, 3... Swing arm, 4
, 5... Bobbin, 6.7... Conductor, 8.9... Coil, 10° 1F... Stator, τ2. I3...Cylindrical external core, 14°15...Bar-shaped internal core, 16.17.
...End core, 18.19-...Permanent magnet for field, 2
0...Supporting member, 21...Mounting member, 22...Reflecting mirror.

Claims (1)

[Scope of utility model registration request] A swinging arm that is rotatable around one axis, a cylindrical bobbin that is arranged symmetrically on both sides of an extension of the swinging arm, and has an arc-shaped cylindrical bobbin centered on the axis, and each of the cylindrical bobbins. a movable element including a wound coil; a pair of cylindrical external iron cores each having an arc shape centered on the axis and fitting onto the outer periphery of each of the cylindrical bobbins at intervals; a stator that includes a pair of rod-shaped internal cores that fit into the cylindrical bobbin at intervals, a pair of end cores that connect the cylindrical outer core and the pair of rod-shaped internal cores, and a field permanent magnet; A moving coil type circular arc motor comprising: