JPH10174409A - Movable magnet type rotary actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable magnet type rotary actuator which can facilitate wiring of a driving coil by simplifying its structure and can attain cost reduction and high reliability. SOLUTION: One set of cores 14, 14' are provided on respective insides of a U-cross sectional case 11 and a mounting plate 12, and drive coils 13, 13' are wound around the respective cores 14, 14'. A shaft 15 is fitted in the U-cross sectional case 11 and the mounting plate 12 so as to rotate freely. A V-shaped supporting member 15a is fixed on the shaft 15 so as to rotate freely between the drive coils 13, 13' and the cores 14, 14'. At respective arms 15a1, 15a2 of the V-shaped supporting member 15a, permanent magnets 17, 17' which are magnetized so as to become opposite in polarity to each other are constituted of a plastic material, and stoppers 18, 18' which regulate a rotational range are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary actuator for converting electric energy into rotational force,
The present invention relates to a movable magnet type rotary actuator capable of reciprocating at a fixed angle and continuing to maintain a position without energization.

[0002]

2. Description of the Related Art Conventionally, a configuration example shown in FIG. 3 has been known as this kind of movable magnet type rotary actuator. 3 (a) is a plan view in which the upper electromagnetic coil and above are omitted, and FIG. 3 (b) is an A-
FIG. 4 is a cross-sectional view taken along the line A ′, and as shown, two pairs of left and right electromagnetic coils (hereinafter referred to as drive coils) 3, 3 ′ are urged and attached to a support member 5 a fixed to the shaft 5. The permanent magnet 7 is sequentially attracted to the left and right cores 4 and 4 ', and a switching tool (not shown) connected to the shaft 5 is reciprocated by a predetermined angle to maintain the position without energization.

[0003]

However, in the movable magnet type rotary actuator having the above-described configuration, the upper and lower
There is a problem that an inexpensive actuator cannot be obtained because the wiring in the set, that is, the four drive coils, is complicated.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a pair of cores disposed in the case above and below, and is wound around these cores respectively to form a pair of upper and lower electromagnetic coils ( A drive member is provided opposite to the shaft provided on the case, and a stopper for regulating the rotation range of the shaft is provided on the shaft provided between the upper and lower drive coils.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show an embodiment of a movable magnet type rotary actuator according to the present invention, in which FIG. 1A is a plan view in which an upper drive coil is omitted, and FIG. A set of cores 14 forming a magnetic circuit together with the case A is provided substantially at the center of the case A including a case 11 and a mounting plate 12 having a U-shaped cross section.
14 'are opposed to each other with a constant gap.
Drive coils 13 and 13 'are wound around 4'. A shaft 15 is provided at one end of the case A with the upper and lower bearings 1.
The V-shaped support member 15a is rotatably fixed to the shaft 15 between the cores 14 and 14 '. As shown in FIG. 1B, the core 1 is attached to both arms 15a1 and 15a2 of the support member 15a.
Permanent magnets 17 and 17 'are molded and fixed at positions passing between them and are magnetized so that the upper and lower magnetic poles are opposite. Reference numerals 18 and 18 'denote left and right stoppers of the support member 15a.

The present invention having the above configuration operates as follows. That is, first, when the drive coils 13 and 13 'are energized, the case 11, the core 14', the core 14,
Even if the magnetic circuit of the mounting plate 12 and the case 11 is closed, for example, the permanent magnet 17 'is attracted to the cores 14 and 14' and the support member 15a stops at the stopper 18, and the power is cut off, FIG. It is held in the position shown in b). Then
When the drive coils 13 and 13 'are energized in the opposite direction to the previous direction, the direction of the magnetic flux in the above-described magnetic circuit is reversed, and although not shown, the permanent magnet 17 magnetized in the opposite direction to the permanent magnet 17' Is sucked by the cores 14 and 14 'and stopped by the stopper 18'. Even if the energization is stopped, the position holding state is maintained.

According to the present embodiment, since the drive coil is constituted by one set of upper and lower drive coils and two permanent magnets 17 and 17 ′ on the left and right,
Since the structure is simplified and the wiring and the like of the drive coil are facilitated, an inexpensive and highly reliable movable magnet type rotary actuator can be obtained.

FIG. 2 is a view showing another embodiment of the movable magnet type rotary actuator according to the present invention. 2A is a plan view omitting an upper part of a case and a drive coil, and FIG. 2B is a side sectional view showing a main part thereof.
The same reference numerals are given to the same parts. As is clear from the figure, also in the present embodiment, a pair of drive coils 13 and 13 ′ are provided opposite to each other, and cores 14 and 14 ′ face the case 11 and the mounting plate 12 at the center of the drive coils. The configuration in which the shaft 15 is fixed and rotatably provided by the bearing 16 of the case 11 and the mounting plate 12 and the support member 25 formed of plastic is fixed is the same as in the above-described embodiment. However, in the case of the present embodiment, as shown in the drawing, the difference is that one permanent magnet 27 is supported by the integral support member 25, and both ends of the permanent magnet 27 are polarized to opposite polarities. Magnetized. In addition,
Reference numerals 18 and 18 'denote stoppers for restricting the rotation range of the support member 25. Note that the inner surface of the case 11 can be used as a stopper.

The movable magnet type rotary actuator having the above configuration operates as follows. That is, first, when the drive coils 13 and 13 'are energized, the case 11, the core 1
4, the magnetic circuit of the core 14 ', the mounting plate 12, and the case 11 is closed, and one of the magnetic field generated thereby and the left and right magnetic poles of the permanent magnet 27 acts to rotate the support member 25. 2 (a), the right magnetic pole of the permanent magnet 27 is attracted to the cores 14 and 14 ', and
Comes into contact with the stopper 18 and stops. Next, when the drive coils 13 and 13 'are energized in the direction opposite to the front, the support member 25 rotates in the direction opposite to the front and the left magnetic pole of the permanent magnet 17 is attracted and stopped by the stopper 18'. .

[0010] As described above, the structure and the wiring are further simplified by disposing the permanent magnet 27 polarized and magnetized to the opposite polarity to the one set of drive coils.

[0011]

As described above, according to the present invention, the following effects can be obtained. Since a fixed set of opposed drive coils and a support member provided with permanent magnets whose magnetization polarity is opposite in the rotating direction are provided, a conventional structure for fixing two opposed drive coils is provided. The wiring of the drive coil becomes remarkably easy as compared with the above, and it can be expected to provide an inexpensive and highly reliable movable magnet type rotary actuator.

[Brief description of the drawings]

FIG. 1 is a main part plan view and a main part side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view and a sectional side view of a main part of another embodiment of the present invention.

FIG. 3 is a plan view of a main part and a side sectional view of a main part showing a conventional example.

[Explanation of symbols]

 A case 11 U-shaped section case 12 Mounting plate 13, 13 'Driving coil 14, 14' Core 15 Shaft 15a, 25 Support member 17, 17 ', 27 Permanent magnet 18, 18' Stopper

Claims (1)

[Claims] 1. A case, a shaft rotatably attached to the case, a support member fixed to the shaft,
A permanent magnet supported by the support member and magnetized to have opposite polarities in the shaft direction; a pair of cores opposed to each other with the permanent magnet interposed therebetween and fixed vertically above and below the case; A movable magnet type rotary actuator comprising a pair of electromagnetic coils fixed vertically and a stopper for restricting a rotation range of the support member.