JPS6122743A - Rotary drive device - Google Patents

Abstract

PURPOSE:To displace the phase of a torque by the prescribed angle by inclining the large air gap portion between a rotary magnet and a stationary magnetic unit at a certain angle with respect to the line of magnetic force generated at the individual magnetic units, and forming two narrow portions having narrow sections. CONSTITUTION:A cylindrical rotary magnet 3 is inserted into the center of a through hole 7 formed at a part of a stationary magnetic unit 1 for forming a closed magnetic path having a wound coil 2. Air gaps formed between the magnet 3 and the unit 1 in the hole 7 are increased as air gaps 61, 62 in the direction inclined at an angle alpha with respect to the axis X parallel to the line of magnetic force generated at the unit 1, decreased at small air gaps 63, 64 in a direction perpendicular to the direction, and narrow parts 511, 512, 521, 522 reduced in the sectional area of the unit are formed at the unit 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary drive device consisting of a permanent magnet and a fixed magnetic body having a narrow portion, which can be used as a rotary actuator, and can be used as a solenoid valve or a switch mechanism. It is used as an electromagnetic relay etc. by combining with

[Conventional technology]

Conventionally, this type of rotary drive device has a fixed magnetic body 1 around which a coil 2 is wound to form a closed magnetic path, and a part of this solid magnetic body, as shown in a schematic top view of the main part in FIG. A cylindrical rotating magnet 3 is inserted into a through hole 7, and the air gap between the fixed magnetic body 1 and the rotating magnet 3 is formed in the X-axis direction parallel to the lines of magnetic force generated in the fixed magnetic body 1. Both end portions 61 and 62 are large, and both end portions 63 and 62 in the vertical Y-axis direction are large.
64 is made small, and the fixed magnetic body 1 has a narrow portion 521.64 which narrows down the cross-sectional area of this solid magnetic body. , 522 are provided. 8 is a rotation axis of the rotating magnet 3.

In the conventional rotary drive device with the above configuration, the rotating magnet 3
The torque curve diagram of is as shown in FIG. 5, and the rotation angle θ of the rotating magnet 3 is 45°.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional rotary drive device, the rotation angle θ of the rotating magnet 3 is only about 45 degrees, so when used as an electromagnetic relay, as shown in the schematic diagram of the contact part in FIG. When the contact is turned off, the separation distance of the contact 9 is small and a sufficient insulation distance cannot be obtained. Therefore, the length of the arm 10 connected to the rotating shaft of the rotating magnet must be increased, and miniaturization is not possible. There is a problem that this method requires a large amount of torque. In addition, in Figure 6, 11
is a current-carrying blade.

[Means for solving problems]

In the conventional rotary drive device, the large gap between the rotating magnet and the fixed magnetic body is provided at a certain angle (α°) (l: J) with respect to the lines of magnetic force generated in the magnetic body, and Two new narrow sections were created to reduce the area.

[For production]

The phase of 1-lux generated by coil energization is shifted by the tilted angle (α°), making it possible to increase the rotation angle.

[Example] Hereinafter, an example of the present invention shown in the drawings will be described. 1st
The figure is a schematic top view of the main parts of the rotary drive device according to the present invention.
Figure +a+ is a longitudinal sectional view taken along line U-U shown in Figure 1;
Figure 1) is a vertical sectional view taken along the line V-V shown in Figure 1, in which 1 is a fixed magnetic body around which a coil 2 is wound to form a closed magnetic path, and 7 is a fixed magnetic body provided in a part of this fixed magnetic body 1. A cylindrical rotating magnet 3 is inserted into the center of the through hole 7, and the rotating magnet 3 and the fixed magnetic body 1 are inserted into the through hole 7.
The air gap formed between the fixed magnetic body 1 is a large air gap 61, 62 in a direction tilted at a certain angle α° with respect to the axis The fixed magnetic body 1 is further provided with a narrow portion 511 which narrows the cross-sectional area of the fixed magnetic body.
, 512, 521, and 522 are provided. 8 is a rotation axis of the rotating magnet 3.

In the rotary drive device of the present invention having the above configuration, the torque curve diagram of the rotary magnet 3 is as shown in FIG. 3, where the horizontal axis is the rotation angle θ of the rotary magnet 3, the vertical axis is the torque, and in the figure, A is The torque curve when the coil is not energized, B is the torque curve generated when the coil is energized, and C is the torque curve when the coil is energized.As shown by the arrow, the rotation angle of the rotating magnet 3 is about 90 degrees. Therefore, while the rotation angle of the rotary magnet in the conventional rotary drive device shown in FIG. 5 is about 45 degrees, the rotation angle of the rotary magnet in the rotary drive device of the present invention increases to 90 degrees. Become. Furthermore, the range of torque change due to coil on/off also increases.

〔Effect of the invention〕

As mentioned above, in the rotary drive device according to the present invention,
By being able to shift the phase of the torque generated by energizing the coil by α°, the rotation angle θ of the rotating magnet increases, and when used as an electromagnetic relay, the contact can be turned off as shown in the schematic diagram of the contact in Figure 7. The separation distance between the time contacts becomes large, and therefore the device can be made smaller, which is a great effect.

[Brief explanation of drawings]

FIG. 1 is a schematic top view showing the configuration of an embodiment of a rotary drive device according to the present invention, FIG. 2 fal is a vertical sectional view taken along line U-U shown in FIG. 3 is a torque curve diagram of the rotating magnet in the inventive rotary drive device shown in FIG. 1; FIG. 4 is a schematic top view of the conventional rotary drive device; Fig. 5 is a torque curve diagram of the conventional device shown in Fig. 4, Fig. 6 is a schematic diagram of the contact portion when the conventional rotary drive device is used in an electromagnetic relay, and Fig. 7 is a diagram of the rotary drive device according to the present invention. This is a schematic diagram of a contact part when used in an electromagnetic relay, where the same reference numerals indicate the same or equivalent parts. 1...Fixed magnetic body, 2...Coil, 3...Rotating magnet, 7... Through hole of fixed magnetic body, 61.62, 63.
64... void, 511, 512, 521, 522...
- Narrow width portion, 8...Rotation axis, θ...Rotation angle of rotating magnet.

Claims (1)

[Claims] A fixed magnetic body around which a coil is wound to form a closed magnetic path, and a rotating magnet inserted into the center of a through hole formed in a part of the fixed magnetic body, and the rotating magnet and the fixed magnetic body are connected to each other. The air gap formed between the fixed magnetic body is made larger at both end portions in a direction that is at a certain angle to an axis parallel to the lines of magnetic force generated in the fixed magnetic body, and is made smaller at both end portions in a direction perpendicular to the direction. A rotary drive device characterized in that the magnetic body has four narrow parts formed by reducing the cross-sectional area of the fixed magnetic body.